Release 4.11 net/core/dev.c

/*
 *      NET3    Protocol independent device support routines.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      Derived from the non IP parts of dev.c 1.0.19
 *              Authors:        Ross Biro
 *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *      Additional Authors:
 *              Florian la Roche <rzsfl@rz.uni-sb.de>
 *              Alan Cox <gw4pts@gw4pts.ampr.org>
 *              David Hinds <dahinds@users.sourceforge.net>
 *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *              Adam Sulmicki <adam@cfar.umd.edu>
 *              Pekka Riikonen <priikone@poesidon.pspt.fi>
 *
 *      Changes:
 *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
 *                                      to 2 if register_netdev gets called
 *                                      before net_dev_init & also removed a
 *                                      few lines of code in the process.
 *              Alan Cox        :       device private ioctl copies fields back.
 *              Alan Cox        :       Transmit queue code does relevant
 *                                      stunts to keep the queue safe.
 *              Alan Cox        :       Fixed double lock.
 *              Alan Cox        :       Fixed promisc NULL pointer trap
 *              ????????        :       Support the full private ioctl range
 *              Alan Cox        :       Moved ioctl permission check into
 *                                      drivers
 *              Tim Kordas      :       SIOCADDMULTI/SIOCDELMULTI
 *              Alan Cox        :       100 backlog just doesn't cut it when
 *                                      you start doing multicast video 8)
 *              Alan Cox        :       Rewrote net_bh and list manager.
 *              Alan Cox        :       Fix ETH_P_ALL echoback lengths.
 *              Alan Cox        :       Took out transmit every packet pass
 *                                      Saved a few bytes in the ioctl handler
 *              Alan Cox        :       Network driver sets packet type before
 *                                      calling netif_rx. Saves a function
 *                                      call a packet.
 *              Alan Cox        :       Hashed net_bh()
 *              Richard Kooijman:       Timestamp fixes.
 *              Alan Cox        :       Wrong field in SIOCGIFDSTADDR
 *              Alan Cox        :       Device lock protection.
 *              Alan Cox        :       Fixed nasty side effect of device close
 *                                      changes.
 *              Rudi Cilibrasi  :       Pass the right thing to
 *                                      set_mac_address()
 *              Dave Miller     :       32bit quantity for the device lock to
 *                                      make it work out on a Sparc.
 *              Bjorn Ekwall    :       Added KERNELD hack.
 *              Alan Cox        :       Cleaned up the backlog initialise.
 *              Craig Metz      :       SIOCGIFCONF fix if space for under
 *                                      1 device.
 *          Thomas Bogendoerfer :       Return ENODEV for dev_open, if there
 *                                      is no device open function.
 *              Andi Kleen      :       Fix error reporting for SIOCGIFCONF
 *          Michael Chastain    :       Fix signed/unsigned for SIOCGIFCONF
 *              Cyrus Durgin    :       Cleaned for KMOD
 *              Adam Sulmicki   :       Bug Fix : Network Device Unload
 *                                      A network device unload needs to purge
 *                                      the backlog queue.
 *      Paul Rusty Russell      :       SIOCSIFNAME
 *              Pekka Riikonen  :       Netdev boot-time settings code
 *              Andrew Morton   :       Make unregister_netdevice wait
 *                                      indefinitely on dev->refcnt
 *              J Hadi Salim    :       - Backlog queue sampling
 *                                      - netif_rx() feedback
 */

#include <linux/uaccess.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/hash.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/notifier.h>
#include <linux/skbuff.h>
#include <linux/bpf.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/busy_poll.h>
#include <linux/rtnetlink.h>
#include <linux/stat.h>
#include <net/dst.h>
#include <net/dst_metadata.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
#include <net/xfrm.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netpoll.h>
#include <linux/rcupdate.h>
#include <linux/delay.h>
#include <net/iw_handler.h>
#include <asm/current.h>
#include <linux/audit.h>
#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <net/mpls.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/jhash.h>
#include <linux/random.h>
#include <trace/events/napi.h>
#include <trace/events/net.h>
#include <trace/events/skb.h>
#include <linux/pci.h>
#include <linux/inetdevice.h>
#include <linux/cpu_rmap.h>
#include <linux/static_key.h>
#include <linux/hashtable.h>
#include <linux/vmalloc.h>
#include <linux/if_macvlan.h>
#include <linux/errqueue.h>
#include <linux/hrtimer.h>
#include <linux/netfilter_ingress.h>
#include <linux/crash_dump.h>

#include "net-sysfs.h"

/* Instead of increasing this, you should create a hash table. */

#define MAX_GRO_SKBS 8

/* This should be increased if a protocol with a bigger head is added. */

#define GRO_MAX_HEAD (MAX_HEADER + 128)

static DEFINE_SPINLOCK(ptype_lock);
static DEFINE_SPINLOCK(offload_lock);

struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;

struct list_head ptype_all __read_mostly;	
/* Taps */

static struct list_head offload_base __read_mostly;

static int netif_rx_internal(struct sk_buff *skb);
static int call_netdevice_notifiers_info(unsigned long val,
					 struct net_device *dev,
					 struct netdev_notifier_info *info);

/*
 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
 * semaphore.
 *
 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
 *
 * Writers must hold the rtnl semaphore while they loop through the
 * dev_base_head list, and hold dev_base_lock for writing when they do the
 * actual updates.  This allows pure readers to access the list even
 * while a writer is preparing to update it.
 *
 * To put it another way, dev_base_lock is held for writing only to
 * protect against pure readers; the rtnl semaphore provides the
 * protection against other writers.
 *
 * See, for example usages, register_netdevice() and
 * unregister_netdevice(), which must be called with the rtnl
 * semaphore held.
 */

DEFINE_RWLOCK(dev_base_lock);

EXPORT_SYMBOL(dev_base_lock);

/* protects napi_hash addition/deletion and napi_gen_id */
static DEFINE_SPINLOCK(napi_hash_lock);


static unsigned int napi_gen_id = NR_CPUS;
static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);


static seqcount_t devnet_rename_seq;



static inline void dev_base_seq_inc(struct net *net)
{
	while (++net->dev_base_seq == 0)
		;
}

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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
{
	unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));

	return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
}

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static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
{
	return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
}

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static inline void rps_lock(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	spin_lock(&sd->input_pkt_queue.lock);
#endif
}

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static inline void rps_unlock(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	spin_unlock(&sd->input_pkt_queue.lock);
#endif
}

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/* Device list insertion */


static void list_netdevice(struct net_device *dev)
{
	struct net *net = dev_net(dev);

	ASSERT_RTNL();

	write_lock_bh(&dev_base_lock);
	list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
	hlist_add_head_rcu(&dev->index_hlist,
			   dev_index_hash(net, dev->ifindex));
	write_unlock_bh(&dev_base_lock);

	dev_base_seq_inc(net);
}

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/* Device list removal
 * caller must respect a RCU grace period before freeing/reusing dev
 */


static void unlist_netdevice(struct net_device *dev)
{
	ASSERT_RTNL();

	/* Unlink dev from the device chain */
	write_lock_bh(&dev_base_lock);
	list_del_rcu(&dev->dev_list);
	hlist_del_rcu(&dev->name_hlist);
	hlist_del_rcu(&dev->index_hlist);
	write_unlock_bh(&dev_base_lock);

	dev_base_seq_inc(dev_net(dev));
}

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/*
 *      Our notifier list
 */

static RAW_NOTIFIER_HEAD(netdev_chain);

/*
 *      Device drivers call our routines to queue packets here. We empty the
 *      queue in the local softnet handler.
 */

DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);

EXPORT_PER_CPU_SYMBOL(softnet_data);

#ifdef CONFIG_LOCKDEP
/*
 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
 * according to dev->type
 */

static const unsigned short netdev_lock_type[] = {
	 ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
	 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
	 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
	 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
	 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
	 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
	 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
	 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
	 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
	 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
	 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
	 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
	 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
	 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
	 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};


static const char *const netdev_lock_name[] = {
	"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
	"_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
	"_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
	"_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
	"_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
	"_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
	"_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
	"_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
	"_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
	"_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
	"_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
	"_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
	"_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
	"_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
	"_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};


static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];

static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];



static inline unsigned short netdev_lock_pos(unsigned short dev_type)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
		if (netdev_lock_type[i] == dev_type)
			return i;
	/* the last key is used by default */
	return ARRAY_SIZE(netdev_lock_type) - 1;
}

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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
{
	int i;

	i = netdev_lock_pos(dev_type);
	lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
				   netdev_lock_name[i]);
}

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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
{
	int i;

	i = netdev_lock_pos(dev->type);
	lockdep_set_class_and_name(&dev->addr_list_lock,
				   &netdev_addr_lock_key[i],
				   netdev_lock_name[i]);
}
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#else


static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
{
}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
{
}
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#endif

/*******************************************************************************
 *
 *              Protocol management and registration routines
 *
 *******************************************************************************/


/*
 *      Add a protocol ID to the list. Now that the input handler is
 *      smarter we can dispense with all the messy stuff that used to be
 *      here.
 *
 *      BEWARE!!! Protocol handlers, mangling input packets,
 *      MUST BE last in hash buckets and checking protocol handlers
 *      MUST start from promiscuous ptype_all chain in net_bh.
 *      It is true now, do not change it.
 *      Explanation follows: if protocol handler, mangling packet, will
 *      be the first on list, it is not able to sense, that packet
 *      is cloned and should be copied-on-write, so that it will
 *      change it and subsequent readers will get broken packet.
 *                                                      --ANK (980803)
 */



static inline struct list_head *ptype_head(const struct packet_type *pt)
{
	if (pt->type == htons(ETH_P_ALL))
		return pt->dev ? &pt->dev->ptype_all : &ptype_all;
	else
		return pt->dev ? &pt->dev->ptype_specific :
				 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
}

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/**
 *      dev_add_pack - add packet handler
 *      @pt: packet type declaration
 *
 *      Add a protocol handler to the networking stack. The passed &packet_type
 *      is linked into kernel lists and may not be freed until it has been
 *      removed from the kernel lists.
 *
 *      This call does not sleep therefore it can not
 *      guarantee all CPU's that are in middle of receiving packets
 *      will see the new packet type (until the next received packet).
 */



void dev_add_pack(struct packet_type *pt)
{
	struct list_head *head = ptype_head(pt);

	spin_lock(&ptype_lock);
	list_add_rcu(&pt->list, head);
	spin_unlock(&ptype_lock);
}
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EXPORT_SYMBOL(dev_add_pack);

/**
 *      __dev_remove_pack        - remove packet handler
 *      @pt: packet type declaration
 *
 *      Remove a protocol handler that was previously added to the kernel
 *      protocol handlers by dev_add_pack(). The passed &packet_type is removed
 *      from the kernel lists and can be freed or reused once this function
 *      returns.
 *
 *      The packet type might still be in use by receivers
 *      and must not be freed until after all the CPU's have gone
 *      through a quiescent state.
 */


void __dev_remove_pack(struct packet_type *pt)
{
	struct list_head *head = ptype_head(pt);
	struct packet_type *pt1;

	spin_lock(&ptype_lock);

	list_for_each_entry(pt1, head, list) {
		if (pt == pt1) {
			list_del_rcu(&pt->list);
			goto out;
		}
	}

	pr_warn("dev_remove_pack: %p not found\n", pt);
out:
	spin_unlock(&ptype_lock);
}
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EXPORT_SYMBOL(__dev_remove_pack);

/**
 *      dev_remove_pack  - remove packet handler
 *      @pt: packet type declaration
 *
 *      Remove a protocol handler that was previously added to the kernel
 *      protocol handlers by dev_add_pack(). The passed &packet_type is removed
 *      from the kernel lists and can be freed or reused once this function
 *      returns.
 *
 *      This call sleeps to guarantee that no CPU is looking at the packet
 *      type after return.
 */


void dev_remove_pack(struct packet_type *pt)
{
	__dev_remove_pack(pt);

	synchronize_net();
}
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EXPORT_SYMBOL(dev_remove_pack);


/**
 *      dev_add_offload - register offload handlers
 *      @po: protocol offload declaration
 *
 *      Add protocol offload handlers to the networking stack. The passed
 *      &proto_offload is linked into kernel lists and may not be freed until
 *      it has been removed from the kernel lists.
 *
 *      This call does not sleep therefore it can not
 *      guarantee all CPU's that are in middle of receiving packets
 *      will see the new offload handlers (until the next received packet).
 */


void dev_add_offload(struct packet_offload *po)
{
	struct packet_offload *elem;

	spin_lock(&offload_lock);
	list_for_each_entry(elem, &offload_base, list) {
		if (po->priority < elem->priority)
			break;
	}
	list_add_rcu(&po->list, elem->list.prev);
	spin_unlock(&offload_lock);
}
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EXPORT_SYMBOL(dev_add_offload);

/**
 *      __dev_remove_offload     - remove offload handler
 *      @po: packet offload declaration
 *
 *      Remove a protocol offload handler that was previously added to the
 *      kernel offload handlers by dev_add_offload(). The passed &offload_type
 *      is removed from the kernel lists and can be freed or reused once this
 *      function returns.
 *
 *      The packet type might still be in use by receivers
 *      and must not be freed until after all the CPU's have gone
 *      through a quiescent state.
 */


static void __dev_remove_offload(struct packet_offload *po)
{
	struct list_head *head = &offload_base;
	struct packet_offload *po1;

	spin_lock(&offload_lock);

	list_for_each_entry(po1, head, list) {
		if (po == po1) {
			list_del_rcu(&po->list);
			goto out;
		}
	}

	pr_warn("dev_remove_offload: %p not found\n", po);
out:
	spin_unlock(&offload_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
71
95.95%
1
33.33%
Eric Dumazet
2
2.70%
1
33.33%
Stephen Hemminger
1
1.35%
1
33.33%
Total
74
100.00%
3
100.00%

/**
 *      dev_remove_offload       - remove packet offload handler
 *      @po: packet offload declaration
 *
 *      Remove a packet offload handler that was previously added to the kernel
 *      offload handlers by dev_add_offload(). The passed &offload_type is
 *      removed from the kernel lists and can be freed or reused once this
 *      function returns.
 *
 *      This call sleeps to guarantee that no CPU is looking at the packet
 *      type after return.
 */


void dev_remove_offload(struct packet_offload *po)
{
	__dev_remove_offload(po);

	synchronize_net();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%


EXPORT_SYMBOL(dev_remove_offload);

/******************************************************************************
 *
 *                    Device Boot-time Settings Routines
 *
 ******************************************************************************/

/* Boot time configuration table */

static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];

/**
 *      netdev_boot_setup_add   - add new setup entry
 *      @name: name of the device
 *      @map: configured settings for the device
 *
 *      Adds new setup entry to the dev_boot_setup list.  The function
 *      returns 0 on error and 1 on success.  This is a generic routine to
 *      all netdevices.
 */


static int netdev_boot_setup_add(char *name, struct ifmap *map)
{
	struct netdev_boot_setup *s;
	int i;

	s = dev_boot_setup;
	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
		if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
			memset(s[i].name, 0, sizeof(s[i].name));
			strlcpy(s[i].name, name, IFNAMSIZ);
			memcpy(&s[i].map, map, sizeof(s[i].map));
			break;
		}
	}

	return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
132
94.96%
1
25.00%
Arnaldo Carvalho de Melo
3
2.16%
1
25.00%
Wang Chen
3
2.16%
1
25.00%
Adrian Bunk
1
0.72%
1
25.00%
Total
139
100.00%
4
100.00%

/**
 * netdev_boot_setup_check      - check boot time settings
 * @dev: the netdevice
 *
 * Check boot time settings for the device.
 * The found settings are set for the device to be used
 * later in the device probing.
 * Returns 0 if no settings found, 1 if they are.
 */


int netdev_boot_setup_check(struct net_device *dev)
{
	struct netdev_boot_setup *s = dev_boot_setup;
	int i;

	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
		if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
		    !strcmp(dev->name, s[i].name)) {
			dev->irq = s[i].map.irq;
			dev->base_addr = s[i].map.base_addr;
			dev->mem_start = s[i].map.mem_start;
			dev->mem_end = s[i].map.mem_end;
			return 1;
		}
	}
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
133
97.79%
2
50.00%
Arnaldo Carvalho de Melo
2
1.47%
1
25.00%
Wang Chen
1
0.74%
1
25.00%
Total
136
100.00%
4
100.00%


EXPORT_SYMBOL(netdev_boot_setup_check);


/**
 * netdev_boot_base     - get address from boot time settings
 * @prefix: prefix for network device
 * @unit: id for network device
 *
 * Check boot time settings for the base address of device.
 * The found settings are set for the device to be used
 * later in the device probing.
 * Returns 0 if no settings found.
 */


unsigned long netdev_boot_base(const char *prefix, int unit)
{
	const struct netdev_boot_setup *s = dev_boot_setup;
	char name[IFNAMSIZ];
	int i;

	sprintf(name, "%s%d", prefix, unit);

	/*
         * If device already registered then return base of 1
         * to indicate not to probe for this interface
         */
	if (__dev_get_by_name(&init_net, name))
		return 1;

	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
		if (!strcmp(name, s[i].name))
			return s[i].map.base_addr;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
94
96.91%
2
66.67%
Eric W. Biedermann
3
3.09%
1
33.33%
Total
97
100.00%
3
100.00%

/*
 * Saves at boot time configured settings for any netdevice.
 */


int __init netdev_boot_setup(char *str)
{
	int ints[5];
	struct ifmap map;

	str = get_options(str, ARRAY_SIZE(ints), ints);
	if (!str || !*str)
		return 0;

	/* Save settings */
	memset(&map, 0, sizeof(map));
	if (ints[0] > 0)
		map.irq = ints[1];
	if (ints[0] > 1)
		map.base_addr = ints[2];
	if (ints[0] > 2)
		map.mem_start = ints[3];
	if (ints[0] > 3)
		map.mem_end = ints[4];

	/* Add new entry to the list */
	return netdev_boot_setup_add(str, &map);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
141
99.30%
1
50.00%
Linus Torvalds
1
0.70%
1
50.00%
Total
142
100.00%
2
100.00%

__setup("netdev=", netdev_boot_setup);

/*******************************************************************************
 *
 *                          Device Interface Subroutines
 *
 *******************************************************************************/

/**
 *      dev_get_iflink  - get 'iflink' value of a interface
 *      @dev: targeted interface
 *
 *      Indicates the ifindex the interface is linked to.
 *      Physical interfaces have the same 'ifindex' and 'iflink' values.
 */



int dev_get_iflink(const struct net_device *dev)
{
	if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
		return dev->netdev_ops->ndo_get_iflink(dev);

	return dev->ifindex;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
38
100.00%
2
100.00%
Total
38
100.00%
2
100.00%


EXPORT_SYMBOL(dev_get_iflink);

/**
 *      dev_fill_metadata_dst - Retrieve tunnel egress information.
 *      @dev: targeted interface
 *      @skb: The packet.
 *
 *      For better visibility of tunnel traffic OVS needs to retrieve
 *      egress tunnel information for a packet. Following API allows
 *      user to get this info.
 */


int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
	struct ip_tunnel_info *info;

	if (!dev->netdev_ops  || !dev->netdev_ops->ndo_fill_metadata_dst)
		return -EINVAL;

	info = skb_tunnel_info_unclone(skb);
	if (!info)
		return -ENOMEM;
	if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
		return -EINVAL;

	return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Pravin B Shelar
84
100.00%
1
100.00%
Total
84
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);

/**
 *      __dev_get_by_name       - find a device by its name
 *      @net: the applicable net namespace
 *      @name: name to find
 *
 *      Find an interface by name. Must be called under RTNL semaphore
 *      or @dev_base_lock. If the name is found a pointer to the device
 *      is returned. If the name is not found then %NULL is returned. The
 *      reference counters are not incremented so the caller must be
 *      careful with locks.
 */



struct net_device *__dev_get_by_name(struct net *net, const char *name)
{
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);

	hlist_for_each_entry(dev, head, name_hlist)
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
29
46.77%
7
58.33%
Eric Dumazet
16
25.81%
1
8.33%
Stephen Hemminger
8
12.90%
1
8.33%
Eric W. Biedermann
5
8.06%
1
8.33%
Linus Torvalds
3
4.84%
1
8.33%
Arnaldo Carvalho de Melo
1
1.61%
1
8.33%
Total
62
100.00%
12
100.00%


EXPORT_SYMBOL(__dev_get_by_name);

/**
 * dev_get_by_name_rcu  - find a device by its name
 * @net: the applicable net namespace
 * @name: name to find
 *
 * Find an interface by name.
 * If the name is found a pointer to the device is returned.
 * If the name is not found then %NULL is returned.
 * The reference counters are not incremented so the caller must be
 * careful with locks. The caller must hold RCU lock.
 */



struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
{
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);

	hlist_for_each_entry_rcu(dev, head, name_hlist)
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
62
100.00%
1
100.00%
Total
62
100.00%
1
100.00%


EXPORT_SYMBOL(dev_get_by_name_rcu);

/**
 *      dev_get_by_name         - find a device by its name
 *      @net: the applicable net namespace
 *      @name: name to find
 *
 *      Find an interface by name. This can be called from any
 *      context and does its own locking. The returned handle has
 *      the usage count incremented and the caller must use dev_put() to
 *      release it when it is no longer needed. %NULL is returned if no
 *      matching device is found.
 */



struct net_device *dev_get_by_name(struct net *net, const char *name)
{
	struct net_device *dev;

	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	if (dev)
		dev_hold(dev);
	rcu_read_unlock();
	return dev;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
37
75.51%
3
60.00%
Eric W. Biedermann
7
14.29%
1
20.00%
Eric Dumazet
5
10.20%
1
20.00%
Total
49
100.00%
5
100.00%


EXPORT_SYMBOL(dev_get_by_name);

/**
 *      __dev_get_by_index - find a device by its ifindex
 *      @net: the applicable net namespace
 *      @ifindex: index of device
 *
 *      Search for an interface by index. Returns %NULL if the device
 *      is not found or a pointer to the device. The device has not
 *      had its reference counter increased so the caller must be careful
 *      about locking. The caller must hold either the RTNL semaphore
 *      or @dev_base_lock.
 */



struct net_device *__dev_get_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);

	hlist_for_each_entry(dev, head, index_hlist)
		if (dev->ifindex == ifindex)
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
25
46.30%
2
40.00%
Eric Dumazet
16
29.63%
1
20.00%
Stephen Hemminger
8
14.81%
1
20.00%
Eric W. Biedermann
5
9.26%
1
20.00%
Total
54
100.00%
5
100.00%


EXPORT_SYMBOL(__dev_get_by_index);

/**
 *      dev_get_by_index_rcu - find a device by its ifindex
 *      @net: the applicable net namespace
 *      @ifindex: index of device
 *
 *      Search for an interface by index. Returns %NULL if the device
 *      is not found or a pointer to the device. The device has not
 *      had its reference counter increased so the caller must be careful
 *      about locking. The caller must hold RCU lock.
 */



struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
{
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);

	hlist_for_each_entry_rcu(dev, head, index_hlist)
		if (dev->ifindex == ifindex)
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
54
100.00%
1
100.00%
Total
54
100.00%
1
100.00%


EXPORT_SYMBOL(dev_get_by_index_rcu);


/**
 *      dev_get_by_index - find a device by its ifindex
 *      @net: the applicable net namespace
 *      @ifindex: index of device
 *
 *      Search for an interface by index. Returns NULL if the device
 *      is not found or a pointer to the device. The device returned has
 *      had a reference added and the pointer is safe until the user calls
 *      dev_put to indicate they have finished with it.
 */



struct net_device *dev_get_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;

	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
	if (dev)
		dev_hold(dev);
	rcu_read_unlock();
	return dev;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
35
74.47%
3
60.00%
Eric W. Biedermann
7
14.89%
1
20.00%
Eric Dumazet
5
10.64%
1
20.00%
Total
47
100.00%
5
100.00%


EXPORT_SYMBOL(dev_get_by_index);

/**
 *      netdev_get_name - get a netdevice name, knowing its ifindex.
 *      @net: network namespace
 *      @name: a pointer to the buffer where the name will be stored.
 *      @ifindex: the ifindex of the interface to get the name from.
 *
 *      The use of raw_seqcount_begin() and cond_resched() before
 *      retrying is required as we want to give the writers a chance
 *      to complete when CONFIG_PREEMPT is not set.
 */


int netdev_get_name(struct net *net, char *name, int ifindex)
{
	struct net_device *dev;
	unsigned int seq;

retry:
	seq = raw_seqcount_begin(&devnet_rename_seq);
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
	if (!dev) {
		rcu_read_unlock();
		return -ENODEV;
	}

	strcpy(name, dev->name);
	rcu_read_unlock();
	if (read_seqcount_retry(&devnet_rename_seq, seq)) {
		cond_resched();
		goto retry;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Schichan
95
100.00%
1
100.00%
Total
95
100.00%
1
100.00%

/**
 *      dev_getbyhwaddr_rcu - find a device by its hardware address
 *      @net: the applicable net namespace
 *      @type: media type of device
 *      @ha: hardware address
 *
 *      Search for an interface by MAC address. Returns NULL if the device
 *      is not found or a pointer to the device.
 *      The caller must hold RCU or RTNL.
 *      The returned device has not had its ref count increased
 *      and the caller must therefore be careful about locking
 *
 */



struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *ha)
{
	struct net_device *dev;

	for_each_netdev_rcu(net, dev)
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
43
71.67%
3
37.50%
Pavel Emelyanov
6
10.00%
1
12.50%
Eric W. Biedermann
6
10.00%
1
12.50%
Eric Dumazet
3
5.00%
1
12.50%
Denis V. Lunev
1
1.67%
1
12.50%
Arnaldo Carvalho de Melo
1
1.67%
1
12.50%
Total
60
100.00%
8
100.00%


EXPORT_SYMBOL(dev_getbyhwaddr_rcu);



struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
{
	struct net_device *dev;

	ASSERT_RTNL();
	for_each_netdev(net, dev)
		if (dev->type == type)
			return dev;

	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Arnaldo Carvalho de Melo
22
50.00%
1
20.00%
Eric W. Biedermann
7
15.91%
1
20.00%
Pavel Emelyanov
7
15.91%
1
20.00%
Patrick McHardy
6
13.64%
1
20.00%
Christoph Hellwig
2
4.55%
1
20.00%
Total
44
100.00%
5
100.00%


EXPORT_SYMBOL(__dev_getfirstbyhwtype);



struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
{
	struct net_device *dev, *ret = NULL;

	rcu_read_lock();
	for_each_netdev_rcu(net, dev)
		if (dev->type == type) {
			dev_hold(dev);
			ret = dev;
			break;
		}
	rcu_read_unlock();
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
22
36.07%
1
25.00%
Eric Dumazet
22
36.07%
1
25.00%
Arnaldo Carvalho de Melo
11
18.03%
1
25.00%
Eric W. Biedermann
6
9.84%
1
25.00%
Total
61
100.00%
4
100.00%


EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
 *      __dev_get_by_flags - find any device with given flags
 *      @net: the applicable net namespace
 *      @if_flags: IFF_* values
 *      @mask: bitmask of bits in if_flags to check
 *
 *      Search for any interface with the given flags. Returns NULL if a device
 *      is not found or a pointer to the device. Must be called inside
 *      rtnl_lock(), and result refcount is unchanged.
 */



struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
				      unsigned short mask)
{
	struct net_device *dev, *ret;

	ASSERT_RTNL();

	ret = NULL;
	for_each_netdev(net, dev) {
		if (((dev->flags ^ if_flags) & mask) == 0) {
			ret = dev;
			break;
		}
	}
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David L Stevens
39
56.52%
1
20.00%
Pavel Emelyanov
15
21.74%
1
20.00%
Eric W. Biedermann
7
10.14%
1
20.00%
Américo Wang
5
7.25%
1
20.00%
Christoph Hellwig
3
4.35%
1
20.00%
Total
69
100.00%
5
100.00%


EXPORT_SYMBOL(__dev_get_by_flags);

/**
 *      dev_valid_name - check if name is okay for network device
 *      @name: name string
 *
 *      Network device names need to be valid file names to
 *      to allow sysfs to work.  We also disallow any kind of
 *      whitespace.
 */


bool dev_valid_name(const char *name)
{
	if (*name == '\0')
		return false;
	if (strlen(name) >= IFNAMSIZ)
		return false;
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return false;

	while (*name) {
		if (*name == '/' || *name == ':' || isspace(*name))
			return false;
		name++;
	}
	return true;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
44
50.57%
2
40.00%
David S. Miller
38
43.68%
2
40.00%
Matthew Thode
5
5.75%
1
20.00%
Total
87
100.00%
5
100.00%


EXPORT_SYMBOL(dev_valid_name);

/**
 *      __dev_alloc_name - allocate a name for a device
 *      @net: network namespace to allocate the device name in
 *      @name: name format string
 *      @buf:  scratch buffer and result name string
 *
 *      Passed a format string - eg "lt%d" it will try and find a suitable
 *      id. It scans list of devices to build up a free map, then chooses
 *      the first empty slot. The caller must hold the dev_base or rtnl lock
 *      while allocating the name and adding the device in order to avoid
 *      duplicates.
 *      Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *      Returns the number of the unit assigned or a negative errno code.
 */



static int __dev_alloc_name(struct net *net, const char *name, char *buf)
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
	unsigned long *inuse;
	struct net_device *d;

	p = strnchr(name, IFNAMSIZ-1, '%');
	if (p) {
		/*
                 * Verify the string as this thing may have come from
                 * the user.  There must be either one "%d" and no other "%"
                 * characters.
                 */
		if (p[1] != 'd' || strchr(p + 2, '%'))
			return -EINVAL;

		/* Use one page as a bit array of possible slots */
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
		if (!inuse)
			return -ENOMEM;

		for_each_netdev(net, d) {
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
			snprintf(buf, IFNAMSIZ, name, i);
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

		i = find_first_zero_bit(inuse, max_netdevices);
		free_page((unsigned long) inuse);
	}

	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
	if (!__dev_get_by_name(net, buf))
		return i;

	/* It is possible to run out of possible slots
         * when the name is long and there isn't enough space left
         * for the digits, or if all bits are used.
         */
	return -ENFILE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
132
56.65%
2
16.67%
Linus Torvalds
39
16.74%
2
16.67%
Linus Torvalds (pre-git)
28
12.02%
3
25.00%
Eric W. Biedermann
23
9.87%
2
16.67%
Octavian Purdila
6
2.58%
1
8.33%
Pavel Emelyanov
4
1.72%
1
8.33%
Arnaldo Carvalho de Melo
1
0.43%
1
8.33%
Total
233
100.00%
12
100.00%

/**
 *      dev_alloc_name - allocate a name for a device
 *      @dev: device
 *      @name: name format string
 *
 *      Passed a format string - eg "lt%d" it will try and find a suitable
 *      id. It scans list of devices to build up a free map, then chooses
 *      the first empty slot. The caller must hold the dev_base or rtnl lock
 *      while allocating the name and adding the device in order to avoid
 *      duplicates.
 *      Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *      Returns the number of the unit assigned or a negative errno code.
 */



int dev_alloc_name(struct net_device *dev, const char *name)
{
	char buf[IFNAMSIZ];
	struct net *net;
	int ret;

	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
55
72.37%
1
20.00%
Linus Torvalds (pre-git)
12
15.79%
2
40.00%
Hideaki Yoshifuji / 吉藤英明
6
7.89%
1
20.00%
Stephen Hemminger
3
3.95%
1
20.00%
Total
76
100.00%
5
100.00%


EXPORT_SYMBOL(dev_alloc_name);



static int dev_alloc_name_ns(struct net *net,
			     struct net_device *dev,
			     const char *name)
{
	char buf[IFNAMSIZ];
	int ret;

	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gao Feng
41
67.21%
1
33.33%
Octavian Purdila
12
19.67%
1
33.33%
Daniel Lezcano
8
13.11%
1
33.33%
Total
61
100.00%
3
100.00%



static int dev_get_valid_name(struct net *net,
			      struct net_device *dev,
			      const char *name)
{
	BUG_ON(!net);

	if (!dev_valid_name(name))
		return -EINVAL;

	if (strchr(name, '%'))
		return dev_alloc_name_ns(net, dev, name);
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
	else if (dev->name != name)
		strlcpy(dev->name, name, IFNAMSIZ);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Octavian Purdila
59
62.11%
1
33.33%
Gao Feng
25
26.32%
1
33.33%
Daniel Lezcano
11
11.58%
1
33.33%
Total
95
100.00%
3
100.00%

/**
 *      dev_change_name - change name of a device
 *      @dev: device
 *      @newname: name (or format string) must be at least IFNAMSIZ
 *
 *      Change name of a device, can pass format strings "eth%d".
 *      for wildcarding.
 */


int dev_change_name(struct net_device *dev, const char *newname)
{
	unsigned char old_assign_type;
	char oldname[IFNAMSIZ];
	int err = 0;
	int ret;
	struct net *net;

	ASSERT_RTNL();
	BUG_ON(!dev_net(dev));

	net = dev_net(dev);
	if (dev->flags & IFF_UP)
		return -EBUSY;

	write_seqcount_begin(&devnet_rename_seq);

	if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
		write_seqcount_end(&devnet_rename_seq);
		return 0;
	}

	memcpy(oldname, dev->name, IFNAMSIZ);

	err = dev_get_valid_name(net, dev, newname);
	if (err < 0) {
		write_seqcount_end(&devnet_rename_seq);
		return err;
	}

	if (oldname[0] && !strchr(oldname, '%'))
		netdev_info(dev, "renamed from %s\n", oldname);

	old_assign_type = dev->name_assign_type;
	dev->name_assign_type = NET_NAME_RENAMED;

rollback:
	ret = device_rename(&dev->dev, dev->name);
	if (ret) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		dev->name_assign_type = old_assign_type;
		write_seqcount_end(&devnet_rename_seq);
		return ret;
	}

	write_seqcount_end(&devnet_rename_seq);

	netdev_adjacent_rename_links(dev, oldname);

	write_lock_bh(&dev_base_lock);
	hlist_del_rcu(&dev->name_hlist);
	write_unlock_bh(&dev_base_lock);

	synchronize_rcu();

	write_lock_bh(&dev_base_lock);
	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
	write_unlock_bh(&dev_base_lock);

	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
	ret = notifier_to_errno(ret);

	if (ret) {
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
			err = ret;
			write_seqcount_begin(&devnet_rename_seq);
			memcpy(dev->name, oldname, IFNAMSIZ);
			memcpy(oldname, newname, IFNAMSIZ);
			dev->name_assign_type = old_assign_type;
			old_assign_type = NET_NAME_RENAMED;
			goto rollback;
		} else {
			pr_err("%s: name change rollback failed: %d\n",
			       dev->name, ret);
		}
	}

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
115
30.26%
7
26.92%
Herbert Xu
73
19.21%
2
7.69%
Veaceslav Falico
40
10.53%
2
7.69%
Eric Dumazet
38
10.00%
4
15.38%
Brian Haley
34
8.95%
1
3.85%
Tom Gundersen
32
8.42%
1
3.85%
Eric W. Biedermann
17
4.47%
1
3.85%
Maneesh Soni
16
4.21%
1
3.85%
Hideaki Yoshifuji / 吉藤英明
6
1.58%
1
3.85%
Joe Perches
2
0.53%
1
3.85%
Gao Feng
2
0.53%
1
3.85%
Greg Kroah-Hartman
2
0.53%
1
3.85%
Daniel Lezcano
1
0.26%
1
3.85%
Octavian Purdila
1
0.26%
1
3.85%
Pavel Emelyanov
1
0.26%
1
3.85%
Total
380
100.00%
26
100.00%

/**
 *      dev_set_alias - change ifalias of a device
 *      @dev: device
 *      @alias: name up to IFALIASZ
 *      @len: limit of bytes to copy from info
 *
 *      Set ifalias for a device,
 */


int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
	char *new_ifalias;

	ASSERT_RTNL();

	if (len >= IFALIASZ)
		return -EINVAL;

	if (!len) {
		kfree(dev->ifalias);
		dev->ifalias = NULL;
		return 0;
	}

	new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
	if (!new_ifalias)
		return -ENOMEM;
	dev->ifalias = new_ifalias;

	strlcpy(dev->ifalias, alias, len+1);
	return len;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
69
66.35%
1
33.33%
Oliver Hartkopp
23
22.12%
1
33.33%
Alexey Khoroshilov
12
11.54%
1
33.33%
Total
104
100.00%
3
100.00%

/**
 *      netdev_features_change - device changes features
 *      @dev: device to cause notification
 *
 *      Called to indicate a device has changed features.
 */


void netdev_features_change(struct net_device *dev)
{
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
16
94.12%
1
50.00%
Pavel Emelyanov
1
5.88%
1
50.00%
Total
17
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_features_change);

/**
 *      netdev_state_change - device changes state
 *      @dev: device to cause notification
 *
 *      Called to indicate a device has changed state. This function calls
 *      the notifier chains for netdev_chain and sends a NEWLINK message
 *      to the routing socket.
 */


void netdev_state_change(struct net_device *dev)
{
	if (dev->flags & IFF_UP) {
		struct netdev_notifier_change_info change_info;

		change_info.flags_changed = 0;
		call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
					      &change_info.info);
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
35
66.04%
3
60.00%
Loic Prylli
16
30.19%
1
20.00%
Alexei Starovoitov
2
3.77%
1
20.00%
Total
53
100.00%
5
100.00%


EXPORT_SYMBOL(netdev_state_change);

/**
 * netdev_notify_peers - notify network peers about existence of @dev
 * @dev: network device
 *
 * Generate traffic such that interested network peers are aware of
 * @dev, such as by generating a gratuitous ARP. This may be used when
 * a device wants to inform the rest of the network about some sort of
 * reconfiguration such as a failover event or virtual machine
 * migration.
 */


void netdev_notify_peers(struct net_device *dev)
{
	rtnl_lock();
	call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
	call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev);
	rtnl_unlock();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Or Gerlitz
13
43.33%
1
33.33%
Américo Wang
10
33.33%
1
33.33%
Vlad Yasevich
7
23.33%
1
33.33%
Total
30
100.00%
3
100.00%


EXPORT_SYMBOL(netdev_notify_peers);



static int __dev_open(struct net_device *dev)
{
	const struct net_device_ops *ops = dev->netdev_ops;
	int ret;

	ASSERT_RTNL();

	if (!netif_device_present(dev))
		return -ENODEV;

	/* Block netpoll from trying to do any rx path servicing.
         * If we don't do this there is a chance ndo_poll_controller
         * or ndo_poll may be running while we open the device
         */
	netpoll_poll_disable(dev);

	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

	set_bit(__LINK_STATE_START, &dev->state);

	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);

	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);

	netpoll_poll_enable(dev);

	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
		dev->flags |= IFF_UP;
		dev_set_rx_mode(dev);
		dev_activate(dev);
		add_device_randomness(dev->dev_addr, dev->addr_len);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
53
32.52%
10
50.00%
Johannes Berg
23
14.11%
1
5.00%
David S. Miller
21
12.88%
1
5.00%
Stephen Hemminger
18
11.04%
1
5.00%
Jeff Garzik
15
9.20%
1
5.00%
Theodore Y. Ts'o
11
6.75%
1
5.00%
Neil Horman
9
5.52%
1
5.00%
Patrick McHardy
8
4.91%
2
10.00%
Ben Hutchings
3
1.84%
1
5.00%
Eric W. Biedermann
2
1.23%
1
5.00%
Total
163
100.00%
20
100.00%

/**
 *      dev_open        - prepare an interface for use.
 *      @dev:   device to open
 *
 *      Takes a device from down to up state. The device's private open
 *      function is invoked and then the multicast lists are loaded. Finally
 *      the device is moved into the up state and a %NETDEV_UP message is
 *      sent to the netdev notifier chain.
 *
 *      Calling this function on an active interface is a nop. On a failure
 *      a negative errno code is returned.
 */


int dev_open(struct net_device *dev)
{
	int ret;

	if (dev->flags & IFF_UP)
		return 0;

	ret = __dev_open(dev);
	if (ret < 0)
		return ret;

	rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
	call_netdevice_notifiers(NETDEV_UP, dev);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
50
79.37%
1
16.67%
Linus Torvalds (pre-git)
10
15.87%
3
50.00%
Alexei Starovoitov
2
3.17%
1
16.67%
Pavel Emelyanov
1
1.59%
1
16.67%
Total
63
100.00%
6
100.00%


EXPORT_SYMBOL(dev_open);



static int __dev_close_many(struct list_head *head)
{
	struct net_device *dev;

	ASSERT_RTNL();
	might_sleep();

	list_for_each_entry(dev, head, close_list) {
		/* Temporarily disable netpoll until the interface is down */
		netpoll_poll_disable(dev);

		call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);

		clear_bit(__LINK_STATE_START, &dev->state);

		/* Synchronize to scheduled poll. We cannot touch poll list, it
                 * can be even on different cpu. So just clear netif_running().
                 *
                 * dev->stop() will invoke napi_disable() on all of it's
                 * napi_struct instances on this device.
                 */
		smp_mb__after_atomic(); /* Commit netif_running(). */
	}

	dev_deactivate_many(head);

	list_for_each_entry(dev, head, close_list) {
		const struct net_device_ops *ops = dev->netdev_ops;

		/*
                 *      Call the device specific close. This cannot fail.
                 *      Only if device is UP
                 *
                 *      We allow it to be called even after a DETACH hot-plug
                 *      event.
                 */
		if (ops->ndo_stop)
			ops->ndo_stop(dev);

		dev->flags &= ~IFF_UP;
		netpoll_poll_enable(dev);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
38
33.33%
9
42.86%
Octavian Purdila
36
31.58%
1
4.76%
Eric W. Biedermann
13
11.40%
3
14.29%
Stephen Hemminger
8
7.02%
1
4.76%
David S. Miller
6
5.26%
2
9.52%
Patrick McHardy
5
4.39%
1
4.76%
Ben Hutchings
3
2.63%
1
4.76%
Matti Linnanvuori
3
2.63%
1
4.76%
Pavel Emelyanov
1
0.88%
1
4.76%
Peter Zijlstra
1
0.88%
1
4.76%
Total
114
100.00%
21
100.00%



static int __dev_close(struct net_device *dev)
{
	int retval;
	LIST_HEAD(single);

	list_add(&dev->close_list, &single);
	retval = __dev_close_many(&single);
	list_del(&single);

	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Octavian Purdila
24
51.06%
1
25.00%
Linus Torvalds
14
29.79%
1
25.00%
Patrick McHardy
8
17.02%
1
25.00%
Eric W. Biedermann
1
2.13%
1
25.00%
Total
47
100.00%
4
100.00%



int dev_close_many(struct list_head *head, bool unlink)
{
	struct net_device *dev, *tmp;

	/* Remove the devices that don't need to be closed */
	list_for_each_entry_safe(dev, tmp, head, close_list)
		if (!(dev->flags & IFF_UP))
			list_del_init(&dev->close_list);

	__dev_close_many(head);

	list_for_each_entry_safe(dev, tmp, head, close_list) {
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
		call_netdevice_notifiers(NETDEV_DOWN, dev);
		if (unlink)
			list_del_init(&dev->close_list);
	}

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Octavian Purdila
48
46.60%
1
12.50%
Patrick McHardy
26
25.24%
1
12.50%
Eric W. Biedermann
13
12.62%
1
12.50%
David S. Miller
7
6.80%
1
12.50%
Linus Torvalds (pre-git)
6
5.83%
2
25.00%
Alexei Starovoitov
2
1.94%
1
12.50%
Pavel Emelyanov
1
0.97%
1
12.50%
Total
103
100.00%
8
100.00%


EXPORT_SYMBOL(dev_close_many);

/**
 *      dev_close - shutdown an interface.
 *      @dev: device to shutdown
 *
 *      This function moves an active device into down state. A
 *      %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
 *      is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
 *      chain.
 */


int dev_close(struct net_device *dev)
{
	if (dev->flags & IFF_UP) {
		LIST_HEAD(single);

		list_add(&dev->close_list, &single);
		dev_close_many(&single, true);
		list_del(&single);
	}
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Octavian Purdila
30
56.60%
1
14.29%
Eric Dumazet
10
18.87%
1
14.29%
Linus Torvalds
6
11.32%
1
14.29%
Linus Torvalds (pre-git)
3
5.66%
1
14.29%
David S. Miller
2
3.77%
1
14.29%
Eric W. Biedermann
1
1.89%
1
14.29%
Ding Tianhong
1
1.89%
1
14.29%
Total
53
100.00%
7
100.00%


EXPORT_SYMBOL(dev_close);


/**
 *      dev_disable_lro - disable Large Receive Offload on a device
 *      @dev: device
 *
 *      Disable Large Receive Offload (LRO) on a net device.  Must be
 *      called under RTNL.  This is needed if received packets may be
 *      forwarded to another interface.
 */


void dev_disable_lro(struct net_device *dev)
{
	struct net_device *lower_dev;
	struct list_head *iter;

	dev->wanted_features &= ~NETIF_F_LRO;
	netdev_update_features(dev);

	if (unlikely(dev->features & NETIF_F_LRO))
		netdev_WARN(dev, "failed to disable LRO!\n");

	netdev_for_each_lower_dev(dev, lower_dev, iter)
		dev_disable_lro(lower_dev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ben Hutchings
24
38.10%
1
20.00%
Michal Kubeček
23
36.51%
1
20.00%
Michał Mirosław
16
25.40%
3
60.00%
Total
63
100.00%
5
100.00%


EXPORT_SYMBOL(dev_disable_lro);



static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
				   struct net_device *dev)
{
	struct netdev_notifier_info info;

	netdev_notifier_info_init(&info, dev);
	return nb->notifier_call(nb, val, &info);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%


static int dev_boot_phase = 1;

/**
 * register_netdevice_notifier - register a network notifier block
 * @nb: notifier
 *
 * Register a notifier to be called when network device events occur.
 * The notifier passed is linked into the kernel structures and must
 * not be reused until it has been unregistered. A negative errno code
 * is returned on a failure.
 *
 * When registered all registration and up events are replayed
 * to the new notifier to allow device to have a race free
 * view of the network device list.
 */



int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
	struct net_device *last;
	struct net *net;
	int err;

	rtnl_lock();
	err = raw_notifier_chain_register(&netdev_chain, nb);
	if (err)
		goto unlock;
	if (dev_boot_phase)
		goto unlock;
	for_each_net(net) {
		for_each_netdev(net, dev) {
			err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
			err = notifier_to_errno(err);
			if (err)
				goto rollback;

			if (!(dev->flags & IFF_UP))
				continue;

			call_netdevice_notifier(nb, NETDEV_UP, dev);
		}
	}

unlock:
	rtnl_unlock();
	return err;

rollback:
	last = dev;
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				goto outroll;

			if (dev->flags & IFF_UP) {
				call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
							dev);
				call_netdevice_notifier(nb, NETDEV_DOWN, dev);
			}
			call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
		}
	}

outroll:
	raw_notifier_chain_unregister(&netdev_chain, nb);
	goto unlock;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
85
42.08%
1
9.09%
Stephen Hemminger
49
24.26%
1
9.09%
Eric W. Biedermann
28
13.86%
1
9.09%
Linus Torvalds (pre-git)
17
8.42%
3
27.27%
Pavel Emelyanov
12
5.94%
2
18.18%
Jiri Pirko
5
2.48%
1
9.09%
Li RongQing
5
2.48%
1
9.09%
Alan Stern
1
0.50%
1
9.09%
Total
202
100.00%
11
100.00%


EXPORT_SYMBOL(register_netdevice_notifier);

/**
 * unregister_netdevice_notifier - unregister a network notifier block
 * @nb: notifier
 *
 * Unregister a notifier previously registered by
 * register_netdevice_notifier(). The notifier is unlinked into the
 * kernel structures and may then be reused. A negative errno code
 * is returned on a failure.
 *
 * After unregistering unregister and down device events are synthesized
 * for all devices on the device list to the removed notifier to remove
 * the need for special case cleanup code.
 */



int unregister_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
	struct net *net;
	int err;

	rtnl_lock();
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
	if (err)
		goto unlock;

	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev->flags & IFF_UP) {
				call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
							dev);
				call_netdevice_notifier(nb, NETDEV_DOWN, dev);
			}
			call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
		}
	}
unlock:
	rtnl_unlock();
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
67
65.69%
1
16.67%
Linus Torvalds (pre-git)
17
16.67%
2
33.33%
Herbert Xu
14
13.73%
1
16.67%
Jiri Pirko
3
2.94%
1
16.67%
Alan Stern
1
0.98%
1
16.67%
Total
102
100.00%
6
100.00%


EXPORT_SYMBOL(unregister_netdevice_notifier);

/**
 *      call_netdevice_notifiers_info - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
 *      @dev: net_device pointer passed unmodified to notifier function
 *      @info: notifier information data
 *
 *      Call all network notifier blocks.  Parameters and return value
 *      are as for raw_notifier_call_chain().
 */



static int call_netdevice_notifiers_info(unsigned long val,
					 struct net_device *dev,
					 struct netdev_notifier_info *info)
{
	ASSERT_RTNL();
	netdev_notifier_info_init(info, dev);
	return raw_notifier_call_chain(&netdev_chain, val, info);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
20
48.78%
2
33.33%
Roland Dreier
16
39.02%
1
16.67%
Eric W. Biedermann
3
7.32%
1
16.67%
Alan Stern
1
2.44%
1
16.67%
Stephen Hemminger
1
2.44%
1
16.67%
Total
41
100.00%
6
100.00%

/**
 *      call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
 *      @dev: net_device pointer passed unmodified to notifier function
 *
 *      Call all network notifier blocks.  Parameters and return value
 *      are as for raw_notifier_call_chain().
 */



int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
{
	struct netdev_notifier_info info;

	return call_netdevice_notifiers_info(val, dev, &info);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
25
86.21%
1
33.33%
Roland Dreier
3
10.34%
1
33.33%
Eric W. Biedermann
1
3.45%
1
33.33%
Total
29
100.00%
3
100.00%


EXPORT_SYMBOL(call_netdevice_notifiers);

#ifdef CONFIG_NET_INGRESS

static struct static_key ingress_needed __read_mostly;



void net_inc_ingress_queue(void)
{
	static_key_slow_inc(&ingress_needed);
}
Contributors
Person
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CommitProp
Daniel Borkmann
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(net_inc_ingress_queue);



void net_dec_ingress_queue(void)
{
	static_key_slow_dec(&ingress_needed);
}
Contributors
Person
Tokens
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Commits
CommitProp
Daniel Borkmann
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
#endif

#ifdef CONFIG_NET_EGRESS

static struct static_key egress_needed __read_mostly;



void net_inc_egress_queue(void)
{
	static_key_slow_inc(&egress_needed);
}
Contributors
Person
Tokens
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Commits
CommitProp
Daniel Borkmann
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(net_inc_egress_queue);



void net_dec_egress_queue(void)
{
	static_key_slow_dec(&egress_needed);
}
Contributors
Person
Tokens
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Commits
CommitProp
Daniel Borkmann
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(net_dec_egress_queue);
#endif


static struct static_key netstamp_needed __read_mostly;
#ifdef HAVE_JUMP_LABEL

static atomic_t netstamp_needed_deferred;

static atomic_t netstamp_wanted;


static void netstamp_clear(struct work_struct *work)
{
	int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
	int wanted;

	wanted = atomic_add_return(deferred, &netstamp_wanted);
	if (wanted > 0)
		static_key_enable(&netstamp_needed);
	else
		static_key_disable(&netstamp_needed);
}
Contributors
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Eric Dumazet
50
92.59%
3
75.00%
Patrick McHardy
4
7.41%
1
25.00%
Total
54
100.00%
4
100.00%

static DECLARE_WORK(netstamp_work, netstamp_clear);
#endif



void net_enable_timestamp(void)
{
#ifdef HAVE_JUMP_LABEL
	int wanted;

	while (1) {
		wanted = atomic_read(&netstamp_wanted);
		if (wanted <= 0)
			break;
		if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted)
			return;
	}
	atomic_inc(&netstamp_needed_deferred);
	schedule_work(&netstamp_work);
#else
	static_key_slow_inc(&netstamp_needed);
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
66
90.41%
2
50.00%
Patrick McHardy
6
8.22%
1
25.00%
Ingo Molnar
1
1.37%
1
25.00%
Total
73
100.00%
4
100.00%


EXPORT_SYMBOL(net_enable_timestamp);



void net_disable_timestamp(void)
{
#ifdef HAVE_JUMP_LABEL
	int wanted;

	while (1) {
		wanted = atomic_read(&netstamp_wanted);
		if (wanted <= 1)
			break;
		if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted)
			return;
	}
	atomic_dec(&netstamp_needed_deferred);
	schedule_work(&netstamp_work);
#else
	static_key_slow_dec(&netstamp_needed);
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
60
82.19%
3
60.00%
Patrick McHardy
12
16.44%
1
20.00%
Ingo Molnar
1
1.37%
1
20.00%
Total
73
100.00%
5
100.00%


EXPORT_SYMBOL(net_disable_timestamp);



static inline void net_timestamp_set(struct sk_buff *skb)
{
	skb->tstamp = 0;
	if (static_key_false(&netstamp_needed))
		__net_timestamp(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
16
51.61%
2
50.00%
Eric Dumazet
14
45.16%
1
25.00%
Ingo Molnar
1
3.23%
1
25.00%
Total
31
100.00%
4
100.00%


#define net_timestamp_check(COND, SKB)			\
	if (static_key_false(&netstamp_needed)) {               \
                if ((COND) && !(SKB)->tstamp)   \
                        __net_timestamp(SKB);           \
        }                                               \

bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
{
	unsigned int len;

	if (!(dev->flags & IFF_UP))
		return false;

	len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
	if (skb->len <= len)
		return true;

	/* if TSO is enabled, we don't care about the length as the packet
         * could be forwarded without being segmented before
         */
	if (skb_is_gso(skb))
		return true;

	return false;
}

EXPORT_SYMBOL_GPL(is_skb_forwardable);



int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
{
	int ret = ____dev_forward_skb(dev, skb);

	if (likely(!ret)) {
		skb->protocol = eth_type_trans(skb, dev);
		skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
	}

	return ret;
}
Contributors
Person
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CommitProp
Arnd Bergmann
26
42.62%
1
12.50%
Martin KaFai Lau
13
21.31%
1
12.50%
Jay Vosburgh
12
19.67%
1
12.50%
Daniel Lezcano
3
4.92%
1
12.50%
Herbert Xu
3
4.92%
1
12.50%
Américo Wang
2
3.28%
1
12.50%
Eric Dumazet
2
3.28%
2
25.00%
Total
61
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(__dev_forward_skb);

/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *      NET_RX_SUCCESS  (no congestion)
 *      NET_RX_DROP     (packet was dropped, but freed)
 *
 * dev_forward_skb can be used for injecting an skb from the
 * start_xmit function of one device into the receive queue
 * of another device.
 *
 * The receiving device may be in another namespace, so
 * we have to clear all information in the skb that could
 * impact namespace isolation.
 */


int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
{
	return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
}
Contributors
Person
Tokens
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CommitProp
Herbert Xu
23
79.31%
1
33.33%
Arnd Bergmann
5
17.24%
1
33.33%
Ben Hutchings
1
3.45%
1
33.33%
Total
29
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(dev_forward_skb);



static inline int deliver_skb(struct sk_buff *skb,
			      struct packet_type *pt_prev,
			      struct net_device *orig_dev)
{
	if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
		return -ENOMEM;
	atomic_inc(&skb->users);
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}

Contributors
Person
Tokens
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CommitProp
Changli Gao
46
74.19%
1
50.00%
Michael S. Tsirkin
16
25.81%
1
50.00%
Total
62
100.00%
2
100.00%



static inline void deliver_ptype_list_skb(struct sk_buff *skb,
					  struct packet_type **pt,
					  struct net_device *orig_dev,
					  __be16 type,
					  struct list_head *ptype_list)
{
	struct packet_type *ptype, *pt_prev = *pt;

	list_for_each_entry_rcu(ptype, ptype_list, list) {
		if (ptype->type != type)
			continue;
		if (pt_prev)
			deliver_skb(skb, pt_prev, orig_dev);
		pt_prev = ptype;
	}
	*pt = pt_prev;
}

Contributors
Person
Tokens
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CommitProp
Salam Noureddine
81
97.59%
1
50.00%
Jiri Pirko
2
2.41%
1
50.00%
Total
83
100.00%
2
100.00%



static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
{
	if (!ptype->af_packet_priv || !skb->sk)
		return false;

	if (ptype->id_match)
		return ptype->id_match(ptype, skb->sk);
	else if ((struct sock *)ptype->af_packet_priv == skb->sk)
		return true;

	return false;
}

Contributors
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Eric Leblond
72
100.00%
2
100.00%
Total
72
100.00%
2
100.00%

/*
 *      Support routine. Sends outgoing frames to any network
 *      taps currently in use.
 */



void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
{
	struct packet_type *ptype;
	struct sk_buff *skb2 = NULL;
	struct packet_type *pt_prev = NULL;
	struct list_head *ptype_list = &ptype_all;

	rcu_read_lock();
again:
	list_for_each_entry_rcu(ptype, ptype_list, list) {
		/* Never send packets back to the socket
                 * they originated from - MvS (miquels@drinkel.ow.org)
                 */
		if (skb_loop_sk(ptype, skb))
			continue;

		if (pt_prev) {
			deliver_skb(skb2, pt_prev, skb->dev);
			pt_prev = ptype;
			continue;
		}

		/* need to clone skb, done only once */
		skb2 = skb_clone(skb, GFP_ATOMIC);
		if (!skb2)
			goto out_unlock;

		net_timestamp_set(skb2);

		/* skb->nh should be correctly
                 * set by sender, so that the second statement is
                 * just protection against buggy protocols.
                 */
		skb_reset_mac_header(skb2);

		if (skb_network_header(skb2) < skb2->data ||
		    skb_network_header(skb2) > skb_tail_pointer(skb2)) {
			net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
					     ntohs(skb2->protocol),
					     dev->name);
			skb_reset_network_header(skb2);
		}

		skb2->transport_header = skb2->network_header;
		skb2->pkt_type = PACKET_OUTGOING;
		pt_prev = ptype;
	}

	if (ptype_list == &ptype_all) {
		ptype_list = &dev->ptype_all;
		goto again;
	}
out_unlock:
	if (pt_prev)
		pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
	rcu_read_unlock();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
89
39.38%
4
19.05%
Changli Gao
49
21.68%
1
4.76%
Salam Noureddine
37
16.37%
1
4.76%
Arnaldo Carvalho de Melo
15
6.64%
5
23.81%
Stephen Hemminger
10
4.42%
1
4.76%
Simon Horman
6
2.65%
1
4.76%
Eric Dumazet
5
2.21%
1
4.76%
Eric Leblond
4
1.77%
1
4.76%
David S. Miller
4
1.77%
1
4.76%
Sebastian Andrzej Siewior
3
1.33%
1
4.76%
Joe Perches
2
0.88%
2
9.52%
Petr Vandrovec
1
0.44%
1
4.76%
Linus Torvalds
1
0.44%
1
4.76%
Total
226
100.00%
21
100.00%


EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);

/**
 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
 * @dev: Network device
 * @txq: number of queues available
 *
 * If real_num_tx_queues is changed the tc mappings may no longer be
 * valid. To resolve this verify the tc mapping remains valid and if
 * not NULL the mapping. With no priorities mapping to this
 * offset/count pair it will no longer be used. In the worst case TC0
 * is invalid nothing can be done so disable priority mappings. If is
 * expected that drivers will fix this mapping if they can before
 * calling netif_set_real_num_tx_queues.
 */


static void netif_setup_tc(struct net_device *dev, unsigned int txq)
{
	int i;
	struct netdev_tc_txq *tc = &dev->tc_to_txq[0];

	/* If TC0 is invalidated disable TC mapping */
	if (tc->offset + tc->count > txq) {
		pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
		dev->num_tc = 0;
		return;
	}

	/* Invalidated prio to tc mappings set to TC0 */
	for (i = 1; i < TC_BITMASK + 1; i++) {
		int q = netdev_get_prio_tc_map(dev, i);

		tc = &dev->tc_to_txq[q];
		if (tc->offset + tc->count > txq) {
			pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
				i, q);
			netdev_set_prio_tc_map(dev, i, 0);
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
John Fastabend
123
96.09%
1
33.33%
Joe Perches
4
3.12%
1
33.33%
Eric Dumazet
1
0.78%
1
33.33%
Total
128
100.00%
3
100.00%



int netdev_txq_to_tc(struct net_device *dev, unsigned int txq)
{
	if (dev->num_tc) {
		struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
		int i;

		for (i = 0; i < TC_MAX_QUEUE; i++, tc++) {
			if ((txq - tc->offset) < tc->count)
				return i;
		}

		return -1;
	}

	return 0;
}

Contributors
Person
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Alexander Duyck
80
100.00%
1
100.00%
Total
80
100.00%
1
100.00%

#ifdef CONFIG_XPS
static DEFINE_MUTEX(xps_map_mutex);

#define xmap_dereference(P)		\
	rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))



static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
			     int tci, u16 index)
{
	struct xps_map *map = NULL;
	int pos;

	if (dev_maps)
		map = xmap_dereference(dev_maps->cpu_map[tci]);
	if (!map)
		return false;

	for (pos = map->len; pos--;) {
		if (map->queues[pos] != index)
			continue;

		if (map->len > 1) {
			map->queues[pos] = map->queues[--map->len];
			break;
		}

		RCU_INIT_POINTER(dev_maps->cpu_map[tci], NULL);
		kfree_rcu(map, rcu);
		return false;
	}

	return true;
}

Contributors
Person
Tokens
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CommitProp
Alexander Duyck
130
100.00%
3
100.00%
Total
130
100.00%
3
100.00%



static bool remove_xps_queue_cpu(struct net_device *dev,
				 struct xps_dev_maps *dev_maps,
				 int cpu, u16 offset, u16 count)
{
	int num_tc = dev->num_tc ? : 1;
	bool active = false;
	int tci;

	for (tci = cpu * num_tc; num_tc--; tci++) {
		int i, j;

		for (i = count, j = offset; i--; j++) {
			if (!remove_xps_queue(dev_maps, cpu, j))
				break;
		}

		active |= i < 0;
	}

	return active;
}

Contributors
Person
Tokens
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CommitProp
Alexander Duyck
104
100.00%
3
100.00%
Total
104
100.00%
3
100.00%



static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
				   u16 count)
{
	struct xps_dev_maps *dev_maps;
	int cpu, i;
	bool active = false;

	mutex_lock(&xps_map_mutex);
	dev_maps = xmap_dereference(dev->xps_maps);

	if (!dev_maps)
		goto out_no_maps;

	for_each_possible_cpu(cpu)
		active |= remove_xps_queue_cpu(dev, dev_maps, cpu,
					       offset, count);

	if (!active) {
		RCU_INIT_POINTER(dev->xps_maps, NULL);
		kfree_rcu(dev_maps, rcu);
	}

	for (i = offset + (count - 1); count--; i--)
		netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
					     NUMA_NO_NODE);

out_no_maps:
	mutex_unlock(&xps_map_mutex);
}

Contributors
Person
Tokens
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Alexander Duyck
135
100.00%
4
100.00%
Total
135
100.00%
4
100.00%



static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
{
	netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);
}

Contributors
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Alexander Duyck
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%



static struct xps_map *expand_xps_map(struct xps_map *map,
				      int cpu, u16 index)
{
	struct xps_map *new_map;
	int alloc_len = XPS_MIN_MAP_ALLOC;
	int i, pos;

	for (pos = 0; map && pos < map->len; pos++) {
		if (map->queues[pos] != index)
			continue;
		return map;
	}

	/* Need to add queue to this CPU's existing map */
	if (map) {
		if (pos < map->alloc_len)
			return map;

		alloc_len = map->alloc_len * 2;
	}

	/* Need to allocate new map to store queue on this CPU's map */
	new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
			       cpu_to_node(cpu));
	if (!new_map)
		return NULL;

	for (i = 0; i < pos; i++)
		new_map->queues[i] = map->queues[i];
	new_map->alloc_len = alloc_len;
	new_map->len = pos;

	return new_map;
}

Contributors
Person
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Alexander Duyck
162
100.00%
2
100.00%
Total
162
100.00%
2
100.00%



int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
			u16 index)
{
	struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
	int i, cpu, tci, numa_node_id = -2;
	int maps_sz, num_tc = 1, tc = 0;
	struct xps_map *map, *new_map;
	bool active = false;

	if (dev->num_tc) {
		num_tc = dev->num_tc;
		tc = netdev_txq_to_tc(dev, index);
		if (tc < 0)
			return -EINVAL;
	}

	maps_sz = XPS_DEV_MAPS_SIZE(num_tc);
	if (maps_sz < L1_CACHE_BYTES)
		maps_sz = L1_CACHE_BYTES;

	mutex_lock(&xps_map_mutex);

	dev_maps = xmap_dereference(dev->xps_maps);

	/* allocate memory for queue storage */
	for_each_cpu_and(cpu, cpu_online_mask, mask) {
		if (!new_dev_maps)
			new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
		if (!new_dev_maps) {
			mutex_unlock(&xps_map_mutex);
			return -ENOMEM;
		}

		tci = cpu * num_tc + tc;
		map = dev_maps ? xmap_dereference(dev_maps->cpu_map[tci]) :
				 NULL;

		map = expand_xps_map(map, cpu, index);
		if (!map)
			goto error;

		RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
	}

	if (!new_dev_maps)
		goto out_no_new_maps;

	for_each_possible_cpu(cpu) {
		/* copy maps belonging to foreign traffic classes */
		for (i = tc, tci = cpu * num_tc; dev_maps && i--; tci++) {
			/* fill in the new device map from the old device map */
			map = xmap_dereference(dev_maps->cpu_map[tci]);
			RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
		}

		/* We need to explicitly update tci as prevous loop
                 * could break out early if dev_maps is NULL.
                 */
		tci = cpu * num_tc + tc;

		if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
			/* add queue to CPU maps */
			int pos = 0;

			map = xmap_dereference(new_dev_maps->cpu_map[tci]);
			while ((pos < map->len) && (map->queues[pos] != index))
				pos++;

			if (pos == map->len)
				map->queues[map->len++] = index;
#ifdef CONFIG_NUMA
			if (numa_node_id == -2)
				numa_node_id = cpu_to_node(cpu);
			else if (numa_node_id != cpu_to_node(cpu))
				numa_node_id = -1;
#endif
		} else if (dev_maps) {
			/* fill in the new device map from the old device map */
			map = xmap_dereference(dev_maps->cpu_map[tci]);
			RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
		}

		/* copy maps belonging to foreign traffic classes */
		for (i = num_tc - tc, tci++; dev_maps && --i; tci++) {
			/* fill in the new device map from the old device map */
			map = xmap_dereference(dev_maps->cpu_map[tci]);
			RCU_INIT_POINTER(new_dev_maps->cpu_map[tci], map);
		}
	}

	rcu_assign_pointer(dev->xps_maps, new_dev_maps);

	/* Cleanup old maps */
	if (!dev_maps)
		goto out_no_old_maps;

	for_each_possible_cpu(cpu) {
		for (i = num_tc, tci = cpu * num_tc; i--; tci++) {
			new_map = xmap_dereference(new_dev_maps->cpu_map[tci]);
			map = xmap_dereference(dev_maps->cpu_map[tci]);
			if (map && map != new_map)
				kfree_rcu(map, rcu);
		}
	}

	kfree_rcu(dev_maps, rcu);

out_no_old_maps:
	dev_maps = new_dev_maps;
	active = true;

out_no_new_maps:
	/* update Tx queue numa node */
	netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
				     (numa_node_id >= 0) ? numa_node_id :
				     NUMA_NO_NODE);

	if (!dev_maps)
		goto out_no_maps;

	/* removes queue from unused CPUs */
	for_each_possible_cpu(cpu) {
		for (i = tc, tci = cpu * num_tc; i--; tci++)
			active |= remove_xps_queue(dev_maps, tci, index);
		if (!cpumask_test_cpu(cpu, mask) || !cpu_online(cpu))
			active |= remove_xps_queue(dev_maps, tci, index);
		for (i = num_tc - tc, tci++; --i; tci++)
			active |= remove_xps_queue(dev_maps, tci, index);
	}

	/* free map if not active */
	if (!active) {
		RCU_INIT_POINTER(dev->xps_maps, NULL);
		kfree_rcu(dev_maps, rcu);
	}

out_no_maps:
	mutex_unlock(&xps_map_mutex);

	return 0;
error:
	/* remove any maps that we added */
	for_each_possible_cpu(cpu) {
		for (i = num_tc, tci = cpu * num_tc; i--; tci++) {
			new_map = xmap_dereference(new_dev_maps->cpu_map[tci]);
			map = dev_maps ?
			      xmap_dereference(dev_maps->cpu_map[tci]) :
			      NULL;
			if (new_map && new_map != map)
				kfree(new_map);
		}
	}

	mutex_unlock(&xps_map_mutex);

	kfree(new_dev_maps);
	return -ENOMEM;
}
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Alexander Duyck
830
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80.00%
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1
0.12%
1
20.00%
Total
831
100.00%
5
100.00%


EXPORT_SYMBOL(netif_set_xps_queue);

#endif


void netdev_reset_tc(struct net_device *dev)
{
#ifdef CONFIG_XPS
	netif_reset_xps_queues_gt(dev, 0);
#endif
	dev->num_tc = 0;
	memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
	memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
}
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60
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60
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_reset_tc);



int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
{
	if (tc >= dev->num_tc)
		return -EINVAL;

#ifdef CONFIG_XPS
	netif_reset_xps_queues(dev, offset, count);
#endif
	dev->tc_to_txq[tc].count = count;
	dev->tc_to_txq[tc].offset = offset;
	return 0;
}
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70
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2
100.00%
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70
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_set_tc_queue);



int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
{
	if (num_tc > TC_MAX_QUEUE)
		return -EINVAL;

#ifdef CONFIG_XPS
	netif_reset_xps_queues_gt(dev, 0);
#endif
	dev->num_tc = num_tc;
	return 0;
}
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44
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44
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_set_num_tc);

/*
 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
 */


int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
{
	int rc;

	if (txq < 1 || txq > dev->num_tx_queues)
		return -EINVAL;

	if (dev->reg_state == NETREG_REGISTERED ||
	    dev->reg_state == NETREG_UNREGISTERING) {
		ASSERT_RTNL();

		rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
						  txq);
		if (rc)
			return rc;

		if (dev->num_tc)
			netif_setup_tc(dev, txq);

		if (txq < dev->real_num_tx_queues) {
			qdisc_reset_all_tx_gt(dev, txq);
#ifdef CONFIG_XPS
			netif_reset_xps_queues_gt(dev, txq);
#endif
		}
	}

	dev->real_num_tx_queues = txq;
	return 0;
}
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John Fastabend
54
43.90%
2
28.57%
Tom Herbert
49
39.84%
3
42.86%
Alexander Duyck
14
11.38%
1
14.29%
Ben Hutchings
6
4.88%
1
14.29%
Total
123
100.00%
7
100.00%


EXPORT_SYMBOL(netif_set_real_num_tx_queues);

#ifdef CONFIG_SYSFS
/**
 *      netif_set_real_num_rx_queues - set actual number of RX queues used
 *      @dev: Network device
 *      @rxq: Actual number of RX queues
 *
 *      This must be called either with the rtnl_lock held or before
 *      registration of the net device.  Returns 0 on success, or a
 *      negative error code.  If called before registration, it always
 *      succeeds.
 */


int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
{
	int rc;

	if (rxq < 1 || rxq > dev->num_rx_queues)
		return -EINVAL;

	if (dev->reg_state == NETREG_REGISTERED) {
		ASSERT_RTNL();

		rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
						  rxq);
		if (rc)
			return rc;
	}

	dev->real_num_rx_queues = rxq;
	return 0;
}
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Ben Hutchings
51
68.00%
1
33.33%
Tom Herbert
15
20.00%
1
33.33%
Denys Vlasenko
9
12.00%
1
33.33%
Total
75
100.00%
3
100.00%


EXPORT_SYMBOL(netif_set_real_num_rx_queues);
#endif

/**
 * netif_get_num_default_rss_queues - default number of RSS queues
 *
 * This routine should set an upper limit on the number of RSS queues
 * used by default by multiqueue devices.
 */


int netif_get_num_default_rss_queues(void)
{
	return is_kdump_kernel() ?
		1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
}
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Yuval Mintz
15
65.22%
1
33.33%
Hariprasad Shenai
5
21.74%
1
33.33%
Ben Hutchings
3
13.04%
1
33.33%
Total
23
100.00%
3
100.00%


EXPORT_SYMBOL(netif_get_num_default_rss_queues);



static void __netif_reschedule(struct Qdisc *q)
{
	struct softnet_data *sd;
	unsigned long flags;

	local_irq_save(flags);
	sd = this_cpu_ptr(&softnet_data);
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_restore(flags);
}

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Denys Vlasenko
42
64.62%
1
14.29%
Changli Gao
10
15.38%
1
14.29%
David S. Miller
9
13.85%
3
42.86%
Christoph Lameter
2
3.08%
1
14.29%
Jarek Poplawski
2
3.08%
1
14.29%
Total
65
100.00%
7
100.00%



void __netif_schedule(struct Qdisc *q)
{
	if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
		__netif_reschedule(q);
}
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Jarek Poplawski
27
96.43%
1
50.00%
Denys Vlasenko
1
3.57%
1
50.00%
Total
28
100.00%
2
100.00%


EXPORT_SYMBOL(__netif_schedule);


struct dev_kfree_skb_cb {
	
enum skb_free_reason reason;
};



static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
{
	return (struct dev_kfree_skb_cb *)skb->cb;
}

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Eric Dumazet
24
100.00%
1
100.00%
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24
100.00%
1
100.00%



void netif_schedule_queue(struct netdev_queue *txq)
{
	rcu_read_lock();
	if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
		struct Qdisc *q = rcu_dereference(txq->qdisc);

		__netif_schedule(q);
	}
	rcu_read_unlock();
}
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46
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1
100.00%
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46
100.00%
1
100.00%


EXPORT_SYMBOL(netif_schedule_queue);



void netif_tx_wake_queue(struct netdev_queue *dev_queue)
{
	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
		struct Qdisc *q;

		rcu_read_lock();
		q = rcu_dereference(dev_queue->qdisc);
		__netif_schedule(q);
		rcu_read_unlock();
	}
}
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John Fastabend
49
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1
100.00%
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49
100.00%
1
100.00%


EXPORT_SYMBOL(netif_tx_wake_queue);



void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
{
	unsigned long flags;

	if (unlikely(!skb))
		return;

	if (likely(atomic_read(&skb->users) == 1)) {
		smp_rmb();
		atomic_set(&skb->users, 0);
	} else if (likely(!atomic_dec_and_test(&skb->users))) {
		return;
	}
	get_kfree_skb_cb(skb)->reason = reason;
	local_irq_save(flags);
	skb->next = __this_cpu_read(softnet_data.completion_queue);
	__this_cpu_write(softnet_data.completion_queue, skb);
	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_restore(flags);
}
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Eric Dumazet
65
54.62%
1
25.00%
Denys Vlasenko
25
21.01%
1
25.00%
Stephen Hemminger
20
16.81%
1
25.00%
Myungho Jung
9
7.56%
1
25.00%
Total
119
100.00%
4
100.00%


EXPORT_SYMBOL(__dev_kfree_skb_irq);



void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
{
	if (in_irq() || irqs_disabled())
		__dev_kfree_skb_irq(skb, reason);
	else
		dev_kfree_skb(skb);
}
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Denys Vlasenko
27
77.14%
1
50.00%
Eric Dumazet
8
22.86%
1
50.00%
Total
35
100.00%
2
100.00%


EXPORT_SYMBOL(__dev_kfree_skb_any);


/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */


void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_tx_stop_all_queues(dev);
	}
}
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Denys Vlasenko
33
97.06%
1
50.00%
Alexander Duyck
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%


EXPORT_SYMBOL(netif_device_detach);

/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */


void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_tx_wake_all_queues(dev);
		__netdev_watchdog_up(dev);
	}
}
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Denys Vlasenko
39
97.50%
1
50.00%
Alexander Duyck
1
2.50%
1
50.00%
Total
40
100.00%
2
100.00%


EXPORT_SYMBOL(netif_device_attach);

/*
 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
 * to be used as a distribution range.
 */


u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
		  unsigned int num_tx_queues)
{
	u32 hash;
	u16 qoffset = 0;
	u16 qcount = num_tx_queues;

	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
		while (unlikely(hash >= num_tx_queues))
			hash -= num_tx_queues;
		return hash;
	}

	if (dev->num_tc) {
		u8 tc = netdev_get_prio_tc_map(dev, skb->priority);

		qoffset = dev->tc_to_txq[tc].offset;
		qcount = dev->tc_to_txq[tc].count;
	}

	return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
}
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123
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1
100.00%
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123
100.00%
1
100.00%


EXPORT_SYMBOL(__skb_tx_hash);



static void skb_warn_bad_offload(const struct sk_buff *skb)
{
	static const netdev_features_t null_features;
	struct net_device *dev = skb->dev;
	const char *name = "";

	if (!net_ratelimit())
		return;

	if (dev) {
		if (dev->dev.parent)
			name = dev_driver_string(dev->dev.parent);
		else
			name = netdev_name(dev);
	}
	WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
	     "gso_type=%d ip_summed=%d\n",
	     name, dev ? &dev->features : &null_features,
	     skb->sk ? &skb->sk->sk_route_caps : &null_features,
	     skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
	     skb_shinfo(skb)->gso_type, skb->ip_summed);
}

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Ben Hutchings
101
75.94%
1
25.00%
Björn Mork
16
12.03%
1
25.00%
Michał Mirosław
9
6.77%
1
25.00%
Ben Greear
7
5.26%
1
25.00%
Total
133
100.00%
4
100.00%

/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */


int skb_checksum_help(struct sk_buff *skb)
{
	__wsum csum;
	int ret = 0, offset;

	if (skb->ip_summed == CHECKSUM_COMPLETE)
		goto out_set_summed;

	if (unlikely(skb_shinfo(skb)->gso_size)) {
		skb_warn_bad_offload(skb);
		return -EINVAL;
	}

	/* Before computing a checksum, we should make sure no frag could
         * be modified by an external entity : checksum could be wrong.
         */
	if (skb_has_shared_frag(skb)) {
		ret = __skb_linearize(skb);
		if (ret)
			goto out;
	}

	offset = skb_checksum_start_offset(skb);
	BUG_ON(offset >= skb_headlen(skb));
	csum = skb_checksum(skb, offset, skb->len - offset, 0);

	offset += skb->csum_offset;
	BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));

	if (skb_cloned(skb) &&
	    !skb_clone_writable(skb, offset + sizeof(__sum16))) {
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

	*(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
out_set_summed:
	skb->ip_summed = CHECKSUM_NONE;
out:
	return ret;
}
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88
42.11%
4
28.57%
Linus Torvalds
56
26.79%
1
7.14%
Eric Dumazet
27
12.92%
2
14.29%
James Morris
11
5.26%
1
7.14%
Ben Hutchings
9
4.31%
1
7.14%
Kris Katterjohn
8
3.83%
1
7.14%
Patrick McHardy
5
2.39%
1
7.14%
Al Viro
2
0.96%
1
7.14%
Arnaldo Carvalho de Melo
2
0.96%
1
7.14%
Michał Mirosław
1
0.48%
1
7.14%
Total
209
100.00%
14
100.00%


EXPORT_SYMBOL(skb_checksum_help);



__be16 skb_network_protocol(struct sk_buff *skb, int *depth)
{
	__be16 type = skb->protocol;

	/* Tunnel gso handlers can set protocol to ethernet. */
	if (type == htons(ETH_P_TEB)) {
		struct ethhdr *eth;

		if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
			return 0;

		eth = (struct ethhdr *)skb_mac_header(skb);
		type = eth->h_proto;
	}

	return __vlan_get_protocol(skb, type, depth);
}

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Pravin B Shelar
59
68.60%
2
22.22%
Vlad Yasevich
7
8.14%
2
22.22%
Herbert Xu
7
8.14%
1
11.11%
Nikolay Aleksandrov
5
5.81%
1
11.11%
Jesse Gross
3
3.49%
1
11.11%
Toshiaki Makita
3
3.49%
1
11.11%
Li RongQing
2
2.33%
1
11.11%
Total
86
100.00%
9
100.00%

/**
 *      skb_mac_gso_segment - mac layer segmentation handler.
 *      @skb: buffer to segment
 *      @features: features for the output path (see dev->features)
 */


struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
				    netdev_features_t features)
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_offload *ptype;
	int vlan_depth = skb->mac_len;
	__be16 type = skb_network_protocol(skb, &vlan_depth);

	if (unlikely(!type))
		return ERR_PTR(-EINVAL);

	__skb_pull(skb, vlan_depth);

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &offload_base, list) {
		if (ptype->type == type && ptype->callbacks.gso_segment) {
			segs = ptype->callbacks.gso_segment(skb, features);
			break;
		}
	}
	rcu_read_unlock();

	__skb_push(skb, skb->data - skb_mac_header(skb));

	return segs;
}
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Herbert Xu
62
46.27%
2
28.57%
Pravin B Shelar
53
39.55%
1
14.29%
Vlad Yasevich
16
11.94%
3
42.86%
Arnaldo Carvalho de Melo
3
2.24%
1
14.29%
Total
134
100.00%
7
100.00%


EXPORT_SYMBOL(skb_mac_gso_segment);


/* openvswitch calls this on rx path, so we need a different check.
 */


static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
{
	if (tx_path)
		return skb->ip_summed != CHECKSUM_PARTIAL &&
		       skb->ip_summed != CHECKSUM_NONE;

	return skb->ip_summed == CHECKSUM_NONE;
}

Contributors
Person
Tokens
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CommitProp
Pravin B Shelar
33
84.62%
1
50.00%
Eric Dumazet
6
15.38%
1
50.00%
Total
39
100.00%
2
100.00%

/**
 *      __skb_gso_segment - Perform segmentation on skb.
 *      @skb: buffer to segment
 *      @features: features for the output path (see dev->features)
 *      @tx_path: whether it is called in TX path
 *
 *      This function segments the given skb and returns a list of segments.
 *
 *      It may return NULL if the skb requires no segmentation.  This is
 *      only possible when GSO is used for verifying header integrity.
 *
 *      Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
 */


struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
				  netdev_features_t features, bool tx_path)
{
	struct sk_buff *segs;

	if (unlikely(skb_needs_check(skb, tx_path))) {
		int err;

		/* We're going to init ->check field in TCP or UDP header */
		err = skb_cow_head(skb, 0);
		if (err < 0)
			return ERR_PTR(err);
	}

	/* Only report GSO partial support if it will enable us to
         * support segmentation on this frame without needing additional
         * work.
         */
	if (features & NETIF_F_GSO_PARTIAL) {
		netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
		struct net_device *dev = skb->dev;

		partial_features |= dev->features & dev->gso_partial_features;
		if (!skb_gso_ok(skb, features | partial_features))
			features &= ~NETIF_F_GSO_PARTIAL;
	}

	BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
		     sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));

	SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
	SKB_GSO_CB(skb)->encap_level = 0;

	skb_reset_mac_header(skb);
	skb_reset_mac_len(skb);

	segs = skb_mac_gso_segment(skb, features);

	if (unlikely(skb_needs_check(skb, tx_path)))
		skb_warn_bad_offload(skb);

	return segs;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Pravin B Shelar
78
40.41%
2
28.57%
Alexander Duyck
50
25.91%
1
14.29%
Eric Dumazet
37
19.17%
2
28.57%
Konstantin Khlebnikov
21
10.88%
1
14.29%
François Romieu
7
3.63%
1
14.29%
Total
193
100.00%
7
100.00%


EXPORT_SYMBOL(__skb_gso_segment);

/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG


void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
		pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
		dump_stack();
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
27
81.82%
1
33.33%
Stephen Hemminger
4
12.12%
1
33.33%
Joe Perches
2
6.06%
1
33.33%
Total
33
100.00%
3
100.00%


EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

/* Actually, we should eliminate this check as soon as we know, that:
 * 1. IOMMU is present and allows to map all the memory.
 * 2. No high memory really exists on this machine.
 */



static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
{
#ifdef CONFIG_HIGHMEM
	int i;

	if (!(dev->features & NETIF_F_HIGHDMA)) {
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

			if (PageHighMem(skb_frag_page(frag)))
				return 1;
		}
	}

	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;

		if (!pdev)
			return 0;
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			dma_addr_t addr = page_to_phys(skb_frag_page(frag));

			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
				return 1;
		}
	}
#endif
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
FUJITA Tomonori
75
41.67%
1
16.67%
Linus Torvalds
61
33.89%
1
16.67%
Ian Campbell
30
16.67%
1
16.67%
Eric Dumazet
8
4.44%
1
16.67%
Herbert Xu
5
2.78%
1
16.67%
Dave Hansen
1
0.56%
1
16.67%
Total
180
100.00%
6
100.00%

/* If MPLS offload request, verify we are testing hardware MPLS features
 * instead of standard features for the netdev.
 */
#if IS_ENABLED(CONFIG_NET_MPLS_GSO)


static netdev_features_t net_mpls_features(struct sk_buff *skb,
					   netdev_features_t features,
					   __be16 type)
{
	if (eth_p_mpls(type))
		features &= skb->dev->mpls_features;

	return features;
}
Contributors
Person
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CommitProp
Simon Horman
35
100.00%
2
100.00%
Total
35
100.00%
2
100.00%

#else


static netdev_features_t net_mpls_features(struct sk_buff *skb,
					   netdev_features_t features,
					   __be16 type)
{
	return features;
}
Contributors
Person
Tokens
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CommitProp
Simon Horman
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%

#endif



static netdev_features_t harmonize_features(struct sk_buff *skb,
	netdev_features_t features)
{
	int tmp;
	__be16 type;

	type = skb_network_protocol(skb, &tmp);
	features = net_mpls_features(skb, features, type);

	if (skb->ip_summed != CHECKSUM_NONE &&
	    !can_checksum_protocol(features, type)) {
		features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
	}
	if (illegal_highdma(skb->dev, skb))
		features &= ~NETIF_F_SG;

	return features;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jesse Gross
43
49.43%
2
20.00%
Simon Horman
25
28.74%
1
10.00%
Ed L. Cashin
6
6.90%
1
10.00%
Alexander Duyck
4
4.60%
1
10.00%
Vlad Yasevich
3
3.45%
1
10.00%
Michał Mirosław
2
2.30%
1
10.00%
Florian Westphal
2
2.30%
1
10.00%
Tom Herbert
1
1.15%
1
10.00%
Eric Dumazet
1
1.15%
1
10.00%
Total
87
100.00%
10
100.00%



netdev_features_t passthru_features_check(struct sk_buff *skb,
					  struct net_device *dev,
					  netdev_features_t features)
{
	return features;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Toshiaki Makita
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%


EXPORT_SYMBOL(passthru_features_check);



static netdev_features_t dflt_features_check(const struct sk_buff *skb,
					     struct net_device *dev,
					     netdev_features_t features)
{
	return vlan_features_check(skb, features);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Toshiaki Makita
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%



static netdev_features_t gso_features_check(const struct sk_buff *skb,
					    struct net_device *dev,
					    netdev_features_t features)
{
	u16 gso_segs = skb_shinfo(skb)->gso_segs;

	if (gso_segs > dev->gso_max_segs)
		return features & ~NETIF_F_GSO_MASK;

	/* Support for GSO partial features requires software
         * intervention before we can actually process the packets
         * so we need to strip support for any partial features now
         * and we can pull them back in after we have partially
         * segmented the frame.
         */
	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
		features &= ~dev->gso_partial_features;

	/* Make sure to clear the IPv4 ID mangling feature if the
         * IPv4 header has the potential to be fragmented.
         */
	if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
		struct iphdr *iph = skb->encapsulation ?
				    inner_ip_hdr(skb) : ip_hdr(skb);

		if (!(iph->frag_off & htons(IP_DF)))
			features &= ~NETIF_F_TSO_MANGLEID;
	}

	return features;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Duyck
88
72.73%
2
28.57%
Ben Hutchings
13
10.74%
1
14.29%
Eric Dumazet
12
9.92%
1
14.29%
Jesse Gross
6
4.96%
2
28.57%
Michał Mirosław
2
1.65%
1
14.29%
Total
121
100.00%
7
100.00%



netdev_features_t netif_skb_features(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	netdev_features_t features = dev->features;

	if (skb_is_gso(skb))
		features = gso_features_check(skb, dev, features);

	/* If encapsulation offload request, verify we are testing
         * hardware encapsulation features instead of standard
         * features for the netdev
         */
	if (skb->encapsulation)
		features &= dev->hw_enc_features;

	if (skb_vlan_tagged(skb))
		features = netdev_intersect_features(features,
						     dev->vlan_features |
						     NETIF_F_HW_VLAN_CTAG_TX |
						     NETIF_F_HW_VLAN_STAG_TX);

	if (dev->netdev_ops->ndo_features_check)
		features &= dev->netdev_ops->ndo_features_check(skb, dev,
								features);
	else
		features &= dflt_features_check(skb, dev, features);

	return harmonize_features(skb, features);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jesse Gross
51
41.80%
4
33.33%
Alexander Duyck
42
34.43%
1
8.33%
Toshiaki Makita
17
13.93%
3
25.00%
Michal Kubeček
6
4.92%
1
8.33%
Patrick McHardy
3
2.46%
2
16.67%
Ben Hutchings
3
2.46%
1
8.33%
Total
122
100.00%
12
100.00%


EXPORT_SYMBOL(netif_skb_features);



static int xmit_one(struct sk_buff *skb, struct net_device *dev,
		    struct netdev_queue *txq, bool more)
{
	unsigned int len;
	int rc;

	if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
		dev_queue_xmit_nit(skb, dev);

	len = skb->len;
	trace_net_dev_start_xmit(skb, dev);
	rc = netdev_start_xmit(skb, dev, txq, more);
	trace_net_dev_xmit(skb, rc, dev, len);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
43
44.79%
4
33.33%
Herbert Xu
21
21.88%
1
8.33%
Jesse Gross
15
15.62%
2
16.67%
Salam Noureddine
9
9.38%
1
8.33%
Patrick McHardy
3
3.12%
1
8.33%
Patrick Ohly
2
2.08%
1
8.33%
Koki Sanagi
2
2.08%
1
8.33%
Stephen Hemminger
1
1.04%
1
8.33%
Total
96
100.00%
12
100.00%



struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
				    struct netdev_queue *txq, int *ret)
{
	struct sk_buff *skb = first;
	int rc = NETDEV_TX_OK;

	while (skb) {
		struct sk_buff *next = skb->next;

		skb->next = NULL;
		rc = xmit_one(skb, dev, txq, next != NULL);
		if (unlikely(!dev_xmit_complete(rc))) {
			skb->next = next;
			goto out;
		}

		skb = next;
		if (netif_xmit_stopped(txq) && skb) {
			rc = NETDEV_TX_BUSY;
			break;
		}
	}

out:
	*ret = rc;
	return skb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
93
73.81%
3
37.50%
Herbert Xu
17
13.49%
2
25.00%
John Fastabend
9
7.14%
1
12.50%
Alexander Duyck
6
4.76%
1
12.50%
Jesse Gross
1
0.79%
1
12.50%
Total
126
100.00%
8
100.00%



static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
					  netdev_features_t features)
{
	if (skb_vlan_tag_present(skb) &&
	    !vlan_hw_offload_capable(features, skb->vlan_proto))
		skb = __vlan_hwaccel_push_inside(skb);
	return skb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
13
30.23%
2
15.38%
Herbert Xu
11
25.58%
2
15.38%
Eric Dumazet
7
16.28%
3
23.08%
John Fastabend
6
13.95%
1
7.69%
Koki Sanagi
3
6.98%
2
15.38%
Jiri Pirko
2
4.65%
2
15.38%
Patrick Ohly
1
2.33%
1
7.69%
Total
43
100.00%
13
100.00%



static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
{
	netdev_features_t features;

	features = netif_skb_features(skb);
	skb = validate_xmit_vlan(skb, features);
	if (unlikely(!skb))
		goto out_null;

	if (netif_needs_gso(skb, features)) {
		struct sk_buff *segs;

		segs = skb_gso_segment(skb, features);
		if (IS_ERR(segs)) {
			goto out_kfree_skb;
		} else if (segs) {
			consume_skb(skb);
			skb = segs;
		}
	} else {
		if (skb_needs_linearize(skb, features) &&
		    __skb_linearize(skb))
			goto out_kfree_skb;

		/* If packet is not checksummed and device does not
                 * support checksumming for this protocol, complete
                 * checksumming here.
                 */
		if (skb->ip_summed == CHECKSUM_PARTIAL) {
			if (skb->encapsulation)
				skb_set_inner_transport_header(skb,
							       skb_checksum_start_offset(skb));
			else
				skb_set_transport_header(skb,
							 skb_checksum_start_offset(skb));
			if (!(features & NETIF_F_CSUM_MASK) &&
			    skb_checksum_help(skb))
				goto out_kfree_skb;
		}
	}

	return skb;

out_kfree_skb:
	kfree_skb(skb);
out_null:
	atomic_long_inc(&dev->tx_dropped);
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
36
18.09%
4
13.79%
John Fastabend
34
17.09%
1
3.45%
Jesse Gross
25
12.56%
5
17.24%
Herbert Xu
22
11.06%
2
6.90%
Américo Wang
20
10.05%
1
3.45%
Alexander Duyck
16
8.04%
2
6.90%
Eric Dumazet
14
7.04%
3
10.34%
Jason (Hui) Wang
11
5.53%
2
6.90%
Sridhar Samudrala
6
3.02%
1
3.45%
Koki Sanagi
4
2.01%
2
6.90%
Ben Hutchings
3
1.51%
1
3.45%
Patrick McHardy
3
1.51%
1
3.45%
Michał Mirosław
2
1.01%
2
6.90%
Michael Chan
2
1.01%
1
3.45%
Tom Herbert
1
0.50%
1
3.45%
Total
199
100.00%
29
100.00%



struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev)
{
	struct sk_buff *next, *head = NULL, *tail;

	for (; skb != NULL; skb = next) {
		next = skb->next;
		skb->next = NULL;

		/* in case skb wont be segmented, point to itself */
		skb->prev = skb;

		skb = validate_xmit_skb(skb, dev);
		if (!skb)
			continue;

		if (!head)
			head = skb;
		else
			tail->next = skb;
		/* If skb was segmented, skb->prev points to
                 * the last segment. If not, it still contains skb.
                 */
		tail = skb->prev;
	}
	return head;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
100
97.09%
2
66.67%
John Fastabend
3
2.91%
1
33.33%
Total
103
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(validate_xmit_skb_list);



static void qdisc_pkt_len_init(struct sk_buff *skb)
{
	const struct skb_shared_info *shinfo = skb_shinfo(skb);

	qdisc_skb_cb(skb)->pkt_len = skb->len;

	/* To get more precise estimation of bytes sent on wire,
         * we add to pkt_len the headers size of all segments
         */
	if (shinfo->gso_size)  {
		unsigned int hdr_len;
		u16 gso_segs = shinfo->gso_segs;

		/* mac layer + network layer */
		hdr_len = skb_transport_header(skb) - skb_mac_header(skb);

		/* + transport layer */
		if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
			hdr_len += tcp_hdrlen(skb);
		else
			hdr_len += sizeof(struct udphdr);

		if (shinfo->gso_type & SKB_GSO_DODGY)
			gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
						shinfo->gso_size);

		qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
106
77.94%
2
66.67%
Jason (Hui) Wang
30
22.06%
1
33.33%
Total
136
100.00%
3
100.00%



static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
				 struct net_device *dev,
				 struct netdev_queue *txq)
{
	spinlock_t *root_lock = qdisc_lock(q);
	struct sk_buff *to_free = NULL;
	bool contended;
	int rc;

	qdisc_calculate_pkt_len(skb, q);
	/*
         * Heuristic to force contended enqueues to serialize on a
         * separate lock before trying to get qdisc main lock.
         * This permits qdisc->running owner to get the lock more
         * often and dequeue packets faster.
         */
	contended = qdisc_is_running(q);
	if (unlikely(contended))
		spin_lock(&q->busylock);

	spin_lock(root_lock);
	if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
		__qdisc_drop(skb, &to_free);
		rc = NET_XMIT_DROP;
	} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
		   qdisc_run_begin(q)) {
		/*
                 * This is a work-conserving queue; there are no old skbs
                 * waiting to be sent out; and the qdisc is not running -
                 * xmit the skb directly.
                 */

		qdisc_bstats_update(q, skb);

		if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		} else
			qdisc_run_end(q);

		rc = NET_XMIT_SUCCESS;
	} else {
		rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
		if (qdisc_run_begin(q)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		}
	}
	spin_unlock(root_lock);
	if (unlikely(to_free))
		kfree_skb_list(to_free);
	if (unlikely(contended))
		spin_unlock(&q->busylock);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
142
49.13%
7
46.67%
Krishna Kumar
111
38.41%
1
6.67%
Linus Torvalds (pre-git)
14
4.84%
3
20.00%
Linus Torvalds
10
3.46%
1
6.67%
Herbert Xu
6
2.08%
1
6.67%
Arnaldo Carvalho de Melo
3
1.04%
1
6.67%
David S. Miller
3
1.04%
1
6.67%
Total
289
100.00%
15
100.00%

#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)


static void skb_update_prio(struct sk_buff *skb)
{
	struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);

	if (!skb->priority && skb->sk && map) {
		unsigned int prioidx =
			sock_cgroup_prioidx(&skb->sk->sk_cgrp_data);

		if (prioidx < map->priomap_len)
			skb->priority = map->priomap[prioidx];
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Neil Horman
47
64.38%
1
25.00%
Eric Dumazet
20
27.40%
1
25.00%
Tejun Heo
5
6.85%
1
25.00%
Igor Maravić
1
1.37%
1
25.00%
Total
73
100.00%
4
100.00%

#else

#define skb_update_prio(skb)
#endif

DEFINE_PER_CPU(int, xmit_recursion);

EXPORT_SYMBOL(xmit_recursion);

/**
 *      dev_loopback_xmit - loop back @skb
 *      @net: network namespace this loopback is happening in
 *      @sk:  sk needed to be a netfilter okfn
 *      @skb: buffer to transmit
 */


int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
{
	skb_reset_mac_header(skb);
	__skb_pull(skb, skb_network_offset(skb));
	skb->pkt_type = PACKET_LOOPBACK;
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	WARN_ON(!skb_dst(skb));
	skb_dst_force(skb);
	netif_rx_ni(skb);
	return 0;
}
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Michel Machado
59
85.51%
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5
7.25%
1
33.33%
David S. Miller
5
7.25%
1
33.33%
Total
69
100.00%
3
100.00%


EXPORT_SYMBOL(dev_loopback_xmit);

#ifdef CONFIG_NET_EGRESS

static struct sk_buff *

sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
{
	struct tcf_proto *cl = rcu_dereference_bh(dev->egress_cl_list);
	struct tcf_result cl_res;

	if (!cl)
		return skb;

	/* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */
	qdisc_bstats_cpu_update(cl->q, skb);

	switch (tc_classify(skb, cl, &cl_res, false)) {
	case TC_ACT_OK:
	case TC_ACT_RECLASSIFY:
		skb->tc_index = TC_H_MIN(cl_res.classid);
		break;
	case TC_ACT_SHOT:
		qdisc_qstats_cpu_drop(cl->q);
		*ret = NET_XMIT_DROP;
		kfree_skb(skb);
		return NULL;
	case TC_ACT_STOLEN:
	case TC_ACT_QUEUED:
		*ret = NET_XMIT_SUCCESS;
		consume_skb(skb);
		return NULL;
	case TC_ACT_REDIRECT:
		/* No need to push/pop skb's mac_header here on egress! */
		skb_do_redirect(skb);
		*ret = NET_XMIT_SUCCESS;
		return NULL;
	default:
		break;
	}

	return skb;
}
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Daniel Borkmann
153
99.35%
2
66.67%
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1
0.65%
1
33.33%
Total
154
100.00%
3
100.00%

#endif /* CONFIG_NET_EGRESS */



static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
{
#ifdef CONFIG_XPS
	struct xps_dev_maps *dev_maps;
	struct xps_map *map;
	int queue_index = -1;

	rcu_read_lock();
	dev_maps = rcu_dereference(dev->xps_maps);
	if (dev_maps) {
		unsigned int tci = skb->sender_cpu - 1;

		if (dev->num_tc) {
			tci *= dev->num_tc;
			tci += netdev_get_prio_tc_map(dev, skb->priority);
		}

		map = rcu_dereference(dev_maps->cpu_map[tci]);
		if (map) {
			if (map->len == 1)
				queue_index = map->queues[0];
			else
				queue_index = map->queues[reciprocal_scale(skb_get_hash(skb),
									   map->len)];
			if (unlikely(queue_index >= dev->real_num_tx_queues))
				queue_index = -1;
		}
	}
	rcu_read_unlock();

	return queue_index;
#else
	return -1;
#endif
}

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Jiri Pirko
138
79.31%
1
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Alexander Duyck
36
20.69%
1
50.00%
Total
174
100.00%
2
100.00%



static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
	int queue_index = sk_tx_queue_get(sk);

	if (queue_index < 0 || skb->ooo_okay ||
	    queue_index >= dev->real_num_tx_queues) {
		int new_index = get_xps_queue(dev, skb);

		if (new_index < 0)
			new_index = skb_tx_hash(dev, skb);

		if (queue_index != new_index && sk &&
		    sk_fullsock(sk) &&
		    rcu_access_pointer(sk->sk_dst_cache))
			sk_tx_queue_set(sk, new_index);

		queue_index = new_index;
	}

	return queue_index;
}

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Jiri Pirko
105
95.45%
1
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5
4.55%
1
50.00%
Total
110
100.00%
2
100.00%



struct netdev_queue *netdev_pick_tx(struct net_device *dev,
				    struct sk_buff *skb,
				    void *accel_priv)
{
	int queue_index = 0;

#ifdef CONFIG_XPS
	u32 sender_cpu = skb->sender_cpu - 1;

	if (sender_cpu >= (u32)NR_CPUS)
		skb->sender_cpu = raw_smp_processor_id() + 1;
#endif

	if (dev->real_num_tx_queues != 1) {
		const struct net_device_ops *ops = dev->netdev_ops;

		if (ops->ndo_select_queue)
			queue_index = ops->ndo_select_queue(dev, skb, accel_priv,
							    __netdev_pick_tx);
		else
			queue_index = __netdev_pick_tx(dev, skb);

		if (!accel_priv)
			queue_index = netdev_cap_txqueue(dev, queue_index);
	}

	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
}

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124
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1
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14
10.14%
1
50.00%
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138
100.00%
2
100.00%

/**
 *      __dev_queue_xmit - transmit a buffer
 *      @skb: buffer to transmit
 *      @accel_priv: private data used for L2 forwarding offload
 *
 *      Queue a buffer for transmission to a network device. The caller must
 *      have set the device and priority and built the buffer before calling
 *      this function. The function can be called from an interrupt.
 *
 *      A negative errno code is returned on a failure. A success does not
 *      guarantee the frame will be transmitted as it may be dropped due
 *      to congestion or traffic shaping.
 *
 * -----------------------------------------------------------------------------------
 *      I notice this method can also return errors from the queue disciplines,
 *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
 *      be positive.
 *
 *      Regardless of the return value, the skb is consumed, so it is currently
 *      difficult to retry a send to this method.  (You can bump the ref count
 *      before sending to hold a reference for retry if you are careful.)
 *
 *      When calling this method, interrupts MUST be enabled.  This is because
 *      the BH enable code must have IRQs enabled so that it will not deadlock.
 *          --BLG
 */


static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
{
	struct net_device *dev = skb->dev;
	struct netdev_queue *txq;
	struct Qdisc *q;
	int rc = -ENOMEM;

	skb_reset_mac_header(skb);

	if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
		__skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);

	/* Disable soft irqs for various locks below. Also
         * stops preemption for RCU.
         */
	rcu_read_lock_bh();

	skb_update_prio(skb);

	qdisc_pkt_len_init(skb);
#ifdef CONFIG_NET_CLS_ACT
	skb->tc_at_ingress = 0;
# ifdef CONFIG_NET_EGRESS
	if (static_key_false(&egress_needed)) {
		skb = sch_handle_egress(skb, &rc, dev);
		if (!skb)
			goto out;
	}
# endif
#endif
	/* If device/qdisc don't need skb->dst, release it right now while
         * its hot in this cpu cache.
         */
	if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
		skb_dst_drop(skb);
	else
		skb_dst_force(skb);

	txq = netdev_pick_tx(dev, skb, accel_priv);
	q = rcu_dereference_bh(txq->qdisc);

	trace_net_dev_queue(skb);
	if (q->enqueue) {
		rc = __dev_xmit_skb(skb, q, dev, txq);
		goto out;
	}

	/* The device has no queue. Common case for software devices:
         * loopback, all the sorts of tunnels...

         * Really, it is unlikely that netif_tx_lock protection is necessary
         * here.  (f.e. loopback and IP tunnels are clean ignoring statistics
         * counters.)
         * However, it is possible, that they rely on protection
         * made by us here.

         * Check this and shot the lock. It is not prone from deadlocks.
         *Either shot noqueue qdisc, it is even simpler 8)
         */
	if (dev->flags & IFF_UP) {
		int cpu = smp_processor_id(); /* ok because BHs are off */

		if (txq->xmit_lock_owner != cpu) {
			if (unlikely(__this_cpu_read(xmit_recursion) >
				     XMIT_RECURSION_LIMIT))
				goto recursion_alert;

			skb = validate_xmit_skb(skb, dev);
			if (!skb)
				goto out;

			HARD_TX_LOCK(dev, txq, cpu);

			if (!netif_xmit_stopped(txq)) {
				__this_cpu_inc(xmit_recursion);
				skb = dev_hard_start_xmit(skb, dev, txq, &rc);
				__this_cpu_dec(xmit_recursion);
				if (dev_xmit_complete(rc)) {
					HARD_TX_UNLOCK(dev, txq);
					goto out;
				}
			}
			HARD_TX_UNLOCK(dev, txq);
			net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
					     dev->name);
		} else {
			/* Recursion is detected! It is possible,
                         * unfortunately
                         */
recursion_alert:
			net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
					     dev->name);
		}
	}

	rc = -ENETDOWN;
	rcu_read_unlock_bh();

	atomic_long_inc(&dev->tx_dropped);
	kfree_skb_list(skb);
	return rc;
out:
	rcu_read_unlock_bh();
	return rc;
}

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Linus Torvalds (pre-git)
115
29.79%
16
30.19%
Eric Dumazet
61
15.80%
5
9.43%
Daniel Borkmann
53
13.73%
2
3.77%
David S. Miller
32
8.29%
7
13.21%
Willem de Bruijn
29
7.51%
2
3.77%
Arnaldo Carvalho de Melo
23
5.96%
1
1.89%
Jesper Dangaard Brouer
14
3.63%
1
1.89%
Patrick McHardy
7
1.81%
1
1.89%
Jason (Hui) Wang
7
1.81%
1
1.89%
Andi Kleen
7
1.81%
1
1.89%
Neil Horman
5
1.30%
1
1.89%
Koki Sanagi
5
1.30%
1
1.89%
Tommy S. Christensen
5
1.30%
1
1.89%
Krishna Kumar
5
1.30%
1
1.89%
Joe Perches
4
1.04%
2
3.77%
Arthur Kepner
3
0.78%
1
1.89%
Herbert Xu
3
0.78%
2
3.77%
Dipankar Sarma
2
0.52%
1
1.89%
Tom Herbert
1
0.26%
1
1.89%
Tobin C Harding
1
0.26%
1
1.89%
Paul E. McKenney
1
0.26%
1
1.89%
Américo Wang
1
0.26%
1
1.89%
Rashika Kheria
1
0.26%
1
1.89%
Peter P. Waskiewicz Jr
1
0.26%
1
1.89%
Total
386
100.00%
53
100.00%



int dev_queue_xmit(struct sk_buff *skb)
{
	return __dev_queue_xmit(skb, NULL);
}
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Jason (Hui) Wang
17
94.44%
1
50.00%
Eric W. Biedermann
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%


EXPORT_SYMBOL(dev_queue_xmit);



int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
{
	return __dev_queue_xmit(skb, accel_priv);
}
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Jason (Hui) Wang
22
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1
100.00%
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22
100.00%
1
100.00%


EXPORT_SYMBOL(dev_queue_xmit_accel);


/*************************************************************************
 *                      Receiver routines
 *************************************************************************/


int netdev_max_backlog __read_mostly = 1000;

EXPORT_SYMBOL(netdev_max_backlog);


int netdev_tstamp_prequeue __read_mostly = 1;

int netdev_budget __read_mostly = 300;

int weight_p __read_mostly = 64;           
/* old backlog weight */

int dev_weight_rx_bias __read_mostly = 1;  
/* bias for backlog weight */

int dev_weight_tx_bias __read_mostly = 1;  
/* bias for output_queue quota */

int dev_rx_weight __read_mostly = 64;

int dev_tx_weight __read_mostly = 64;

/* Called with irq disabled */


static inline void ____napi_schedule(struct softnet_data *sd,
				     struct napi_struct *napi)
{
	list_add_tail(&napi->poll_list, &sd->poll_list);
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
}

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Eric Dumazet
35
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35
100.00%
1
100.00%

#ifdef CONFIG_RPS

/* One global table that all flow-based protocols share. */

struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;

EXPORT_SYMBOL(rps_sock_flow_table);

u32 rps_cpu_mask __read_mostly;

EXPORT_SYMBOL(rps_cpu_mask);


struct static_key rps_needed __read_mostly;

EXPORT_SYMBOL(rps_needed);

struct static_key rfs_needed __read_mostly;

EXPORT_SYMBOL(rfs_needed);


static struct rps_dev_flow *

set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
	    struct rps_dev_flow *rflow, u16 next_cpu)
{
	if (next_cpu < nr_cpu_ids) {
#ifdef CONFIG_RFS_ACCEL
		struct netdev_rx_queue *rxqueue;
		struct rps_dev_flow_table *flow_table;
		struct rps_dev_flow *old_rflow;
		u32 flow_id;
		u16 rxq_index;
		int rc;

		/* Should we steer this flow to a different hardware queue? */
		if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
		    !(dev->features & NETIF_F_NTUPLE))
			goto out;
		rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
		if (rxq_index == skb_get_rx_queue(skb))
			goto out;

		rxqueue = dev->_rx + rxq_index;
		flow_table = rcu_dereference(rxqueue->rps_flow_table);
		if (!flow_table)
			goto out;
		flow_id = skb_get_hash(skb) & flow_table->mask;
		rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
							rxq_index, flow_id);
		if (rc < 0)
			goto out;
		old_rflow = rflow;
		rflow = &flow_table->flows[flow_id];
		rflow->filter = rc;
		if (old_rflow->filter == rflow->filter)
			old_rflow->filter = RPS_NO_FILTER;
	out:
#endif
		rflow->last_qtail =
			per_cpu(softnet_data, next_cpu).input_queue_head;
	}

	rflow->cpu = next_cpu;
	return rflow;
}

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3
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1
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Eric Dumazet
2
0.85%
1
20.00%
Total
234
100.00%
5
100.00%

/*
 * get_rps_cpu is called from netif_receive_skb and returns the target
 * CPU from the RPS map of the receiving queue for a given skb.
 * rcu_read_lock must be held on entry.
 */


static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
		       struct rps_dev_flow **rflowp)
{
	const struct rps_sock_flow_table *sock_flow_table;
	struct netdev_rx_queue *rxqueue = dev->_rx;
	struct rps_dev_flow_table *flow_table;
	struct rps_map *map;
	int cpu = -1;
	u32 tcpu;
	u32 hash;

	if (skb_rx_queue_recorded(skb)) {
		u16 index = skb_get_rx_queue(skb);

		if (unlikely(index >= dev->real_num_rx_queues)) {
			WARN_ONCE(dev->real_num_rx_queues > 1,
				  "%s received packet on queue %u, but number "
				  "of RX queues is %u\n",
				  dev->name, index, dev->real_num_rx_queues);
			goto done;
		}
		rxqueue += index;
	}

	/* Avoid computing hash if RFS/RPS is not active for this rxqueue */

	flow_table = rcu_dereference(rxqueue->rps_flow_table);
	map = rcu_dereference(rxqueue->rps_map);
	if (!flow_table && !map)
		goto done;

	skb_reset_network_header(skb);
	hash = skb_get_hash(skb);
	if (!hash)
		goto done;

	sock_flow_table = rcu_dereference(rps_sock_flow_table);
	if (flow_table && sock_flow_table) {
		struct rps_dev_flow *rflow;
		u32 next_cpu;
		u32 ident;

		/* First check into global flow table if there is a match */
		ident = sock_flow_table->ents[hash & sock_flow_table->mask];
		if ((ident ^ hash) & ~rps_cpu_mask)
			goto try_rps;

		next_cpu = ident & rps_cpu_mask;

		/* OK, now we know there is a match,
                 * we can look at the local (per receive queue) flow table
                 */
		rflow = &flow_table->flows[hash & flow_table->mask];
		tcpu = rflow->cpu;

		/*
                 * If the desired CPU (where last recvmsg was done) is
                 * different from current CPU (one in the rx-queue flow
                 * table entry), switch if one of the following holds:
                 *   - Current CPU is unset (>= nr_cpu_ids).
                 *   - Current CPU is offline.
                 *   - The current CPU's queue tail has advanced beyond the
                 *     last packet that was enqueued using this table entry.
                 *     This guarantees that all previous packets for the flow
                 *     have been dequeued, thus preserving in order delivery.
                 */
		if (unlikely(tcpu != next_cpu) &&
		    (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
		     ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
		      rflow->last_qtail)) >= 0)) {
			tcpu = next_cpu;
			rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
		}

		if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
			*rflowp = rflow;
			cpu = tcpu;
			goto done;
		}
	}

try_rps:

	if (map) {
		tcpu = map->cpus[reciprocal_scale(hash, map->len)];
		if (cpu_online(tcpu)) {
			cpu = tcpu;
			goto done;
		}
	}

done:
	return cpu;
}

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Tom Herbert
175
45.81%
6
42.86%
Krishna Kumar
103
26.96%
1
7.14%
Eric Dumazet
70
18.32%
2
14.29%
Changli Gao
18
4.71%
2
14.29%
Ben Hutchings
12
3.14%
2
14.29%
Daniel Borkmann
4
1.05%
1
7.14%
Total
382
100.00%
14
100.00%

#ifdef CONFIG_RFS_ACCEL

/**
 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
 * @dev: Device on which the filter was set
 * @rxq_index: RX queue index
 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
 *
 * Drivers that implement ndo_rx_flow_steer() should periodically call
 * this function for each installed filter and remove the filters for
 * which it returns %true.
 */


bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
			 u32 flow_id, u16 filter_id)
{
	struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
	struct rps_dev_flow_table *flow_table;
	struct rps_dev_flow *rflow;
	bool expire = true;
	unsigned int cpu;

	rcu_read_lock();
	flow_table = rcu_dereference(rxqueue->rps_flow_table);
	if (flow_table && flow_id <= flow_table->mask) {
		rflow = &flow_table->flows[flow_id];
		cpu = ACCESS_ONCE(rflow->cpu);
		if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
		    ((int)(per_cpu(softnet_data, cpu).input_queue_head -
			   rflow->last_qtail) <
		     (int)(10 * flow_table->mask)))
			expire = false;
	}
	rcu_read_unlock();
	return expire;
}
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145
100.00%
2
100.00%


EXPORT_SYMBOL(rps_may_expire_flow);

#endif /* CONFIG_RFS_ACCEL */

/* Called from hardirq (IPI) context */


static void rps_trigger_softirq(void *data)
{
	struct softnet_data *sd = data;

	____napi_schedule(sd, &sd->backlog);
	sd->received_rps++;
}

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2
6.25%
1
25.00%
Total
32
100.00%
4
100.00%

#endif /* CONFIG_RPS */

/*
 * Check if this softnet_data structure is another cpu one
 * If yes, queue it to our IPI list and return 1
 * If no, return 0
 */


static int rps_ipi_queued(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *mysd = this_cpu_ptr(&softnet_data);

	if (sd != mysd) {
		sd->rps_ipi_next = mysd->rps_ipi_list;
		mysd->rps_ipi_list = sd;

		__raise_softirq_irqoff(NET_RX_SOFTIRQ);
		return 1;
	}
#endif /* CONFIG_RPS */
	return 0;
}

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61
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2
100.00%

#ifdef CONFIG_NET_FLOW_LIMIT

int netdev_flow_limit_table_len __read_mostly = (1 << 12);
#endif



static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
{
#ifdef CONFIG_NET_FLOW_LIMIT
	struct sd_flow_limit *fl;
	struct softnet_data *sd;
	unsigned int old_flow, new_flow;

	if (qlen < (netdev_max_backlog >> 1))
		return false;

	sd = this_cpu_ptr(&softnet_data);

	rcu_read_lock();
	fl = rcu_dereference(sd->flow_limit);
	if (fl) {
		new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
		old_flow = fl->history[fl->history_head];
		fl->history[fl->history_head] = new_flow;

		fl->history_head++;
		fl->history_head &= FLOW_LIMIT_HISTORY - 1;

		if (likely(fl->buckets[old_flow]))
			fl->buckets[old_flow]--;

		if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
			fl->count++;
			rcu_read_unlock();
			return true;
		}
	}
	rcu_read_unlock();
#endif
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Willem de Bruijn
177
98.33%
1
33.33%
Christoph Lameter
2
1.11%
1
33.33%
Tom Herbert
1
0.56%
1
33.33%
Total
180
100.00%
3
100.00%

/*
 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
 * queue (may be a remote CPU queue).
 */


static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
{
	struct softnet_data *sd;
	unsigned long flags;
	unsigned int qlen;

	sd = &per_cpu(softnet_data, cpu);

	local_irq_save(flags);

	rps_lock(sd);
	if (!netif_running(skb->dev))
		goto drop;
	qlen = skb_queue_len(&sd->input_pkt_queue);
	if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
		if (qlen) {
enqueue:
			__skb_queue_tail(&sd->input_pkt_queue, skb);
			input_queue_tail_incr_save(sd, qtail);
			rps_unlock(sd);
			local_irq_restore(flags);
			return NET_RX_SUCCESS;
		}

		/* Schedule NAPI for backlog device
                 * We can use non atomic operation since we own the queue lock
                 */
		if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
			if (!rps_ipi_queued(sd))
				____napi_schedule(sd, &sd->backlog);
		}
		goto enqueue;
	}

drop:
	sd->dropped++;
	rps_unlock(sd);

	local_irq_restore(flags);

	atomic_long_inc(&skb->dev->rx_dropped);
	kfree_skb(skb);
	return NET_RX_DROP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
61
30.05%
6
26.09%
Tom Herbert
45
22.17%
4
17.39%
Eric Dumazet
34
16.75%
4
17.39%
Willem de Bruijn
18
8.87%
1
4.35%
Changli Gao
17
8.37%
3
13.04%
Julian Anastasov
15
7.39%
1
4.35%
Robert Love
9
4.43%
1
4.35%
Christoph Hellwig
2
0.99%
1
4.35%
Li RongQing
1
0.49%
1
4.35%
Stephen Hemminger
1
0.49%
1
4.35%
Total
203
100.00%
23
100.00%



static int netif_rx_internal(struct sk_buff *skb)
{
	int ret;

	net_timestamp_check(netdev_tstamp_prequeue, skb);

	trace_netif_rx(skb);
#ifdef CONFIG_RPS
	if (static_key_false(&rps_needed)) {
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu;

		preempt_disable();
		rcu_read_lock();

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
		if (cpu < 0)
			cpu = smp_processor_id();

		ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);

		rcu_read_unlock();
		preempt_enable();
	} else
#endif
	{
		unsigned int qtail;

		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
75
57.25%
3
25.00%
Eric Dumazet
42
32.06%
5
41.67%
Changli Gao
6
4.58%
1
8.33%
Koki Sanagi
5
3.82%
1
8.33%
Ben Hutchings
2
1.53%
1
8.33%
Ingo Molnar
1
0.76%
1
8.33%
Total
131
100.00%
12
100.00%

/**
 *      netif_rx        -       post buffer to the network code
 *      @skb: buffer to post
 *
 *      This function receives a packet from a device driver and queues it for
 *      the upper (protocol) levels to process.  It always succeeds. The buffer
 *      may be dropped during processing for congestion control or by the
 *      protocol layers.
 *
 *      return values:
 *      NET_RX_SUCCESS  (no congestion)
 *      NET_RX_DROP     (packet was dropped)
 *
 */



int netif_rx(struct sk_buff *skb)
{
	trace_netif_rx_entry(skb);

	return netif_rx_internal(skb);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ben Hutchings
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%


EXPORT_SYMBOL(netif_rx);



int netif_rx_ni(struct sk_buff *skb)
{
	int err;

	trace_netif_rx_ni_entry(skb);

	preempt_disable();
	err = netif_rx_internal(skb);
	if (local_softirq_pending())
		do_softirq();
	preempt_enable();

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
35
83.33%
2
50.00%
Ben Hutchings
6
14.29%
1
25.00%
Christoph Hellwig
1
2.38%
1
25.00%
Total
42
100.00%
4
100.00%


EXPORT_SYMBOL(netif_rx_ni);



static __latent_entropy void net_tx_action(struct softirq_action *h)
{
	struct softnet_data *sd = this_cpu_ptr(&softnet_data);

	if (sd->completion_queue) {
		struct sk_buff *clist;

		local_irq_disable();
		clist = sd->completion_queue;
		sd->completion_queue = NULL;
		local_irq_enable();

		while (clist) {
			struct sk_buff *skb = clist;

			clist = clist->next;

			WARN_ON(atomic_read(&skb->users));
			if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
				trace_consume_skb(skb);
			else
				trace_kfree_skb(skb, net_tx_action);

			if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
				__kfree_skb(skb);
			else
				__kfree_skb_defer(skb);
		}

		__kfree_skb_flush();
	}

	if (sd->output_queue) {
		struct Qdisc *head;

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
		local_irq_enable();

		while (head) {
			struct Qdisc *q = head;
			spinlock_t *root_lock;

			head = head->next_sched;

			root_lock = qdisc_lock(q);
			spin_lock(root_lock);
			/* We need to make sure head->next_sched is read
                         * before clearing __QDISC_STATE_SCHED
                         */
			smp_mb__before_atomic();
			clear_bit(__QDISC_STATE_SCHED, &q->state);
			qdisc_run(q);
			spin_unlock(root_lock);
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
123
53.02%
5
26.32%
Eric Dumazet
23
9.91%
2
10.53%
Andi Kleen
19
8.19%
1
5.26%
David S. Miller
17
7.33%
3
15.79%
Jesper Dangaard Brouer
17
7.33%
1
5.26%
Jarek Poplawski
12
5.17%
1
5.26%
Changli Gao
9
3.88%
1
5.26%
Koki Sanagi
7
3.02%
1
5.26%
Christoph Lameter
2
0.86%
1
5.26%
Emese Revfy
1
0.43%
1
5.26%
Ilpo Järvinen
1
0.43%
1
5.26%
Peter Zijlstra
1
0.43%
1
5.26%
Total
232
100.00%
19
100.00%

#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE)
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;

EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
#endif


static inline struct sk_buff *

sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
		   struct net_device *orig_dev)
{
#ifdef CONFIG_NET_CLS_ACT
	struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);
	struct tcf_result cl_res;

	/* If there's at least one ingress present somewhere (so
         * we get here via enabled static key), remaining devices
         * that are not configured with an ingress qdisc will bail
         * out here.
         */
	if (!cl)
		return skb;
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
	}

	qdisc_skb_cb(skb)->pkt_len = skb->len;
	skb->tc_at_ingress = 1;
	qdisc_bstats_cpu_update(cl->q, skb);

	switch (tc_classify(skb, cl, &cl_res, false)) {
	case TC_ACT_OK:
	case TC_ACT_RECLASSIFY:
		skb->tc_index = TC_H_MIN(cl_res.classid);
		break;
	case TC_ACT_SHOT:
		qdisc_qstats_cpu_drop(cl->q);
		kfree_skb(skb);
		return NULL;
	case TC_ACT_STOLEN:
	case TC_ACT_QUEUED:
		consume_skb(skb);
		return NULL;
	case TC_ACT_REDIRECT:
		/* skb_mac_header check was done by cls/act_bpf, so
                 * we can safely push the L2 header back before
                 * redirecting to another netdev
                 */
		__skb_push(skb, skb->mac_len);
		skb_do_redirect(skb);
		return NULL;
	default:
		break;
	}
#endif /* CONFIG_NET_CLS_ACT */
	return skb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
76
37.07%
1
7.69%
Daniel Borkmann
71
34.63%
6
46.15%
Alexei Starovoitov
21
10.24%
1
7.69%
Eric Dumazet
20
9.76%
3
23.08%
Florian Westphal
15
7.32%
1
7.69%
Willem de Bruijn
2
0.98%
1
7.69%
Total
205
100.00%
13
100.00%

/**
 *      netdev_is_rx_handler_busy - check if receive handler is registered
 *      @dev: device to check
 *
 *      Check if a receive handler is already registered for a given device.
 *      Return true if there one.
 *
 *      The caller must hold the rtnl_mutex.
 */


bool netdev_is_rx_handler_busy(struct net_device *dev)
{
	ASSERT_RTNL();
	return dev && rtnl_dereference(dev->rx_handler);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mahesh Bandewar
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);

/**
 *      netdev_rx_handler_register - register receive handler
 *      @dev: device to register a handler for
 *      @rx_handler: receive handler to register
 *      @rx_handler_data: data pointer that is used by rx handler
 *
 *      Register a receive handler for a device. This handler will then be
 *      called from __netif_receive_skb. A negative errno code is returned
 *      on a failure.
 *
 *      The caller must hold the rtnl_mutex.
 *
 *      For a general description of rx_handler, see enum rx_handler_result.
 */


int netdev_rx_handler_register(struct net_device *dev,
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data)
{
	if (netdev_is_rx_handler_busy(dev))
		return -EBUSY;

	/* Note: rx_handler_data must be set before rx_handler */
	rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
	rcu_assign_pointer(dev->rx_handler, rx_handler);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
47
92.16%
2
50.00%
Mahesh Bandewar
3
5.88%
1
25.00%
Eric Dumazet
1
1.96%
1
25.00%
Total
51
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(netdev_rx_handler_register);

/**
 *      netdev_rx_handler_unregister - unregister receive handler
 *      @dev: device to unregister a handler from
 *
 *      Unregister a receive handler from a device.
 *
 *      The caller must hold the rtnl_mutex.
 */


void netdev_rx_handler_unregister(struct net_device *dev)
{

	ASSERT_RTNL();
	RCU_INIT_POINTER(dev->rx_handler, NULL);
	/* a reader seeing a non NULL rx_handler in a rcu_read_lock()
         * section has a guarantee to see a non NULL rx_handler_data
         * as well.
         */
	synchronize_net();
	RCU_INIT_POINTER(dev->rx_handler_data, NULL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
29
82.86%
2
50.00%
Eric Dumazet
4
11.43%
1
25.00%
Stephen Hemminger
2
5.71%
1
25.00%
Total
35
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);

/*
 * Limit the use of PFMEMALLOC reserves to those protocols that implement
 * the special handling of PFMEMALLOC skbs.
 */


static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case htons(ETH_P_ARP):
	case htons(ETH_P_IP):
	case htons(ETH_P_IPV6):
	case htons(ETH_P_8021Q):
	case htons(ETH_P_8021AD):
		return true;
	default:
		return false;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mel Gorman
46
82.14%
1
33.33%
Patrick McHardy
5
8.93%
1
33.33%
Joe Perches
5
8.93%
1
33.33%
Total
56
100.00%
3
100.00%



static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
			     int *ret, struct net_device *orig_dev)
{
#ifdef CONFIG_NETFILTER_INGRESS
	if (nf_hook_ingress_active(skb)) {
		int ingress_retval;

		if (*pt_prev) {
			*ret = deliver_skb(skb, *pt_prev, orig_dev);
			*pt_prev = NULL;
		}

		rcu_read_lock();
		ingress_retval = nf_hook_ingress(skb);
		rcu_read_unlock();
		return ingress_retval;
	}
#endif /* CONFIG_NETFILTER_INGRESS */
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pablo Neira Ayuso
69
77.53%
1
33.33%
Aaron Conole
14
15.73%
1
33.33%
Daniel Borkmann
6
6.74%
1
33.33%
Total
89
100.00%
3
100.00%



static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
{
	struct packet_type *ptype, *pt_prev;
	rx_handler_func_t *rx_handler;
	struct net_device *orig_dev;
	bool deliver_exact = false;
	int ret = NET_RX_DROP;
	__be16 type;

	net_timestamp_check(!netdev_tstamp_prequeue, skb);

	trace_netif_receive_skb(skb);

	orig_dev = skb->dev;

	skb_reset_network_header(skb);
	if (!skb_transport_header_was_set(skb))
		skb_reset_transport_header(skb);
	skb_reset_mac_len(skb);

	pt_prev = NULL;

another_round:
	skb->skb_iif = skb->dev->ifindex;

	__this_cpu_inc(softnet_data.processed);

	if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
	    skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
		skb = skb_vlan_untag(skb);
		if (unlikely(!skb))
			goto out;
	}

	if (skb_skip_tc_classify(skb))
		goto skip_classify;

	if (pfmemalloc)
		goto skip_taps;

	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		if (pt_prev)
			ret = deliver_skb(skb, pt_prev, orig_dev);
		pt_prev = ptype;
	}

	list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
		if (pt_prev)
			ret = deliver_skb(skb, pt_prev, orig_dev);
		pt_prev = ptype;
	}

skip_taps:
#ifdef CONFIG_NET_INGRESS
	if (static_key_false(&ingress_needed)) {
		skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev);
		if (!skb)
			goto out;

		if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
			goto out;
	}
#endif
	skb_reset_tc(skb);
skip_classify:
	if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
		goto drop;

	if (skb_vlan_tag_present(skb)) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
		if (vlan_do_receive(&skb))
			goto another_round;
		else if (unlikely(!skb))
			goto out;
	}

	rx_handler = rcu_dereference(skb->dev->rx_handler);
	if (rx_handler) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
		switch (rx_handler(&skb)) {
		case RX_HANDLER_CONSUMED:
			ret = NET_RX_SUCCESS;
			goto out;
		case RX_HANDLER_ANOTHER:
			goto another_round;
		case RX_HANDLER_EXACT:
			deliver_exact = true;
		case RX_HANDLER_PASS:
			break;
		default:
			BUG();
		}
	}

	if (unlikely(skb_vlan_tag_present(skb))) {
		if (skb_vlan_tag_get_id(skb))
			skb->pkt_type = PACKET_OTHERHOST;
		/* Note: we might in the future use prio bits
                 * and set skb->priority like in vlan_do_receive()
                 * For the time being, just ignore Priority Code Point
                 */
		skb->vlan_tci = 0;
	}

	type = skb->protocol;

	/* deliver only exact match when indicated */
	if (likely(!deliver_exact)) {
		deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
				       &ptype_base[ntohs(type) &
						   PTYPE_HASH_MASK]);
	}

	deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
			       &orig_dev->ptype_specific);

	if (unlikely(skb->dev != orig_dev)) {
		deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
				       &skb->dev->ptype_specific);
	}

	if (pt_prev) {
		if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
			goto drop;
		else
			ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
	} else {
drop:
		if (!deliver_exact)
			atomic_long_inc(&skb->dev->rx_dropped);
		else
			atomic_long_inc(&skb->dev->rx_nohandler);
		kfree_skb(skb);
		/* Jamal, now you will not able to escape explaining
                 * me how you were going to use this. :-)
                 */
		ret = NET_RX_DROP;
	}

out:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
91
14.17%
7
10.61%
Salam Noureddine
87
13.55%
1
1.52%
Linus Torvalds (pre-git)
73
11.37%
13
19.70%
David S. Miller
64
9.97%
5
7.58%
Eric Dumazet
45
7.01%
7
10.61%
Jesse Gross
40
6.23%
1
1.52%
Florian Zumbiehl
23
3.58%
1
1.52%
Jamal Hadi Salim
22
3.43%
1
1.52%
Mel Gorman
22
3.43%
1
1.52%
Pablo Neira Ayuso
22
3.43%
2
3.03%
Patrick McHardy
19
2.96%
2
3.03%
Jarod Wilson
16
2.49%
1
1.52%
Michael S. Tsirkin
16
2.49%
2
3.03%
Daniel Borkmann
13
2.02%
2
3.03%
Stephen Hemminger
13
2.02%
3
4.55%
Andrew Morton
13
2.02%
1
1.52%
John Fastabend
11
1.71%
2
3.03%
Herbert Xu
9
1.40%
2
3.03%
Willem de Bruijn
8
1.25%
2
3.03%
Arnaldo Carvalho de Melo
7
1.09%
2
3.03%
Simon Barber
6
0.93%
1
1.52%
Julian Anastasov
6
0.93%
1
1.52%
Koki Sanagi
5
0.78%
1
1.52%
Cristian Bercaru
4
0.62%
1
1.52%
Joe Eykholt
3
0.47%
1
1.52%
Bart De Schuymer
2
0.31%
1
1.52%
Al Viro
1
0.16%
1
1.52%
Vlad Yasevich
1
0.16%
1
1.52%
Total
642
100.00%
66
100.00%



static int __netif_receive_skb(struct sk_buff *skb)
{
	int ret;

	if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
		unsigned long pflags = current->flags;

		/*
                 * PFMEMALLOC skbs are special, they should
                 * - be delivered to SOCK_MEMALLOC sockets only
                 * - stay away from userspace
                 * - have bounded memory usage
                 *
                 * Use PF_MEMALLOC as this saves us from propagating the allocation
                 * context down to all allocation sites.
                 */
		current->flags |= PF_MEMALLOC;
		ret = __netif_receive_skb_core(skb, true);
		tsk_restore_flags(current, pflags, PF_MEMALLOC);
	} else
		ret = __netif_receive_skb_core(skb, false);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
63
87.50%
2
66.67%
Mel Gorman
9
12.50%
1
33.33%
Total
72
100.00%
3
100.00%



static int netif_receive_skb_internal(struct sk_buff *skb)
{
	int ret;

	net_timestamp_check(netdev_tstamp_prequeue, skb);

	if (skb_defer_rx_timestamp(skb))
		return NET_RX_SUCCESS;

	rcu_read_lock();

#ifdef CONFIG_RPS
	if (static_key_false(&rps_needed)) {
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu = get_rps_cpu(skb->dev, skb, &rflow);

		if (cpu >= 0) {
			ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
			rcu_read_unlock();
			return ret;
		}
	}
#endif
	ret = __netif_receive_skb(skb);
	rcu_read_unlock();
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tom Herbert
64
55.65%
3
27.27%
Eric Dumazet
22
19.13%
4
36.36%
Julian Anastasov
16
13.91%
1
9.09%
Richard Cochran
10
8.70%
1
9.09%
Ben Hutchings
2
1.74%
1
9.09%
Ingo Molnar
1
0.87%
1
9.09%
Total
115
100.00%
11
100.00%

/**
 *      netif_receive_skb - process receive buffer from network
 *      @skb: buffer to process
 *
 *      netif_receive_skb() is the main receive data processing function.
 *      It always succeeds. The buffer may be dropped during processing
 *      for congestion control or by the protocol layers.
 *
 *      This function may only be called from softirq context and interrupts
 *      should be enabled.
 *
 *      Return values (usually ignored):
 *      NET_RX_SUCCESS: no congestion
 *      NET_RX_DROP: packet was dropped
 */


int netif_receive_skb(struct sk_buff *skb)
{
	trace_netif_receive_skb_entry(skb);

	return netif_receive_skb_internal(skb);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ben Hutchings
20
95.24%
1
50.00%
Eric W. Biedermann
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%


EXPORT_SYMBOL(netif_receive_skb);

DEFINE_PER_CPU(struct work_struct, flush_works);

/* Network device is going away, flush any packets still pending */


static void flush_backlog(struct work_struct *work)
{
	struct sk_buff *skb, *tmp;
	struct softnet_data *sd;

	local_bh_disable();
	sd = this_cpu_ptr(&softnet_data);

	local_irq_disable();
	rps_lock(sd);
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
		if (skb->dev->reg_state == NETREG_UNREGISTERING) {
			__skb_unlink(skb, &sd->input_pkt_queue);
			kfree_skb(skb);
			input_queue_head_incr(sd);
		}
	}
	rps_unlock(sd);
	local_irq_enable();

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev->reg_state == NETREG_UNREGISTERING) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
			input_queue_head_incr(sd);
		}
	}
	local_bh_enable();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
42
30.43%
1
11.11%
Changli Gao
41
29.71%
2
22.22%
Paolo Abeni
29
21.01%
1
11.11%
Tom Herbert
15
10.87%
3
33.33%
Eric Dumazet
11
7.97%
2
22.22%
Total
138
100.00%
9
100.00%



static void flush_all_backlogs(void)
{
	unsigned int cpu;

	get_online_cpus();

	for_each_online_cpu(cpu)
		queue_work_on(cpu, system_highpri_wq,
			      per_cpu_ptr(&flush_works, cpu));

	for_each_online_cpu(cpu)
		flush_work(per_cpu_ptr(&flush_works, cpu));

	put_online_cpus();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Paolo Abeni
44
84.62%
1
33.33%
Eric Dumazet
7
13.46%
1
33.33%
Stephen Hemminger
1
1.92%
1
33.33%
Total
52
100.00%
3
100.00%



static int napi_gro_complete(struct sk_buff *skb)
{
	struct packet_offload *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &offload_base;
	int err = -ENOENT;

	BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));

	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
		goto out;
	}

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || !ptype->callbacks.gro_complete)
			continue;

		err = ptype->callbacks.gro_complete(skb, 0);
		break;
	}
	rcu_read_unlock();

	if (err) {
		WARN_ON(&ptype->list == head);
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

out:
	return netif_receive_skb_internal(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
91
58.33%
3
27.27%
David S. Miller
31
19.87%
1
9.09%
Eric Dumazet
16
10.26%
1
9.09%
Stephen Hemminger
8
5.13%
1
9.09%
Vlad Yasevich
6
3.85%
2
18.18%
Jerry Chu
2
1.28%
1
9.09%
Ben Hutchings
1
0.64%
1
9.09%
Arnaldo Carvalho de Melo
1
0.64%
1
9.09%
Total
156
100.00%
11
100.00%

/* napi->gro_list contains packets ordered by age.
 * youngest packets at the head of it.
 * Complete skbs in reverse order to reduce latencies.
 */


void napi_gro_flush(struct napi_struct *napi, bool flush_old)
{
	struct sk_buff *skb, *prev = NULL;

	/* scan list and build reverse chain */
	for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
		skb->prev = prev;
		prev = skb;
	}

	for (skb = prev; skb; skb = prev) {
		skb->next = NULL;

		if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
			return;

		prev = skb->prev;
		napi_gro_complete(skb);
		napi->gro_count--;
	}

	napi->gro_list = NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
55
50.00%
2
50.00%
Eric Dumazet
54
49.09%
1
25.00%
Stephen Hemminger
1
0.91%
1
25.00%
Total
110
100.00%
4
100.00%


EXPORT_SYMBOL(napi_gro_flush);



static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
{
	struct sk_buff *p;
	unsigned int maclen = skb->dev->hard_header_len;
	u32 hash = skb_get_hash_raw(skb);

	for (p = napi->gro_list; p; p = p->next) {
		unsigned long diffs;

		NAPI_GRO_CB(p)->flush = 0;

		if (hash != skb_get_hash_raw(p)) {
			NAPI_GRO_CB(p)->same_flow = 0;
			continue;
		}

		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
		diffs |= p->vlan_tci ^ skb->vlan_tci;
		diffs |= skb_metadata_dst_cmp(p, skb);
		if (maclen == ETH_HLEN)
			diffs |= compare_ether_header(skb_mac_header(p),
						      skb_mac_header(skb));
		else if (!diffs)
			diffs = memcmp(skb_mac_header(p),
				       skb_mac_header(skb),
				       maclen);
		NAPI_GRO_CB(p)->same_flow = !diffs;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
119
65.38%
2
40.00%
Tom Herbert
38
20.88%
1
20.00%
Herbert Xu
16
8.79%
1
20.00%
Jesse Gross
9
4.95%
1
20.00%
Total
182
100.00%
5
100.00%



static void skb_gro_reset_offset(struct sk_buff *skb)
{
	const struct skb_shared_info *pinfo = skb_shinfo(skb);
	const skb_frag_t *frag0 = &pinfo->frags[0];

	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;

	if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
	    pinfo->nr_frags &&
	    !PageHighMem(skb_frag_page(frag0))) {
		NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
		NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
						    skb_frag_size(frag0),
						    skb->end - skb->tail);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerry Chu
102
87.18%
1
25.00%
Eric Dumazet
14
11.97%
2
50.00%
Herbert Xu
1
0.85%
1
25.00%
Total
117
100.00%
4
100.00%



static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
{
	struct skb_shared_info *pinfo = skb_shinfo(skb);

	BUG_ON(skb->end - skb->tail < grow);

	memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);

	skb->data_len -= grow;
	skb->tail += grow;

	pinfo->frags[0].page_offset += grow;
	skb_frag_size_sub(&pinfo->frags[0], grow);

	if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
		skb_frag_unref(skb, 0);
		memmove(pinfo->frags, pinfo->frags + 1,
			--pinfo->nr_frags * sizeof(pinfo->frags[0]));
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
144
100.00%
1
100.00%
Total
144
100.00%
1
100.00%



static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
	struct sk_buff **pp = NULL;
	struct packet_offload *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &offload_base;
	int same_flow;
	enum gro_result ret;
	int grow;

	if (!(skb->dev->features & NETIF_F_GRO))
		goto normal;

	if (skb->csum_bad)
		goto normal;

	gro_list_prepare(napi, skb);

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || !ptype->callbacks.gro_receive)
			continue;

		skb_set_network_header(skb, skb_gro_offset(skb));
		skb_reset_mac_len(skb);
		NAPI_GRO_CB(skb)->same_flow = 0;
		NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
		NAPI_GRO_CB(skb)->free = 0;
		NAPI_GRO_CB(skb)->encap_mark = 0;
		NAPI_GRO_CB(skb)->recursion_counter = 0;
		NAPI_GRO_CB(skb)->is_fou = 0;
		NAPI_GRO_CB(skb)->is_atomic = 1;
		NAPI_GRO_CB(skb)->gro_remcsum_start = 0;

		/* Setup for GRO checksum validation */
		switch (skb->ip_summed) {
		case CHECKSUM_COMPLETE:
			NAPI_GRO_CB(skb)->csum = skb->csum;
			NAPI_GRO_CB(skb)->csum_valid = 1;
			NAPI_GRO_CB(skb)->csum_cnt = 0;
			break;
		case CHECKSUM_UNNECESSARY:
			NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
			NAPI_GRO_CB(skb)->csum_valid = 0;
			break;
		default:
			NAPI_GRO_CB(skb)->csum_cnt = 0;
			NAPI_GRO_CB(skb)->csum_valid = 0;
		}

		pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
		break;
	}
	rcu_read_unlock();

	if (&ptype->list == head)
		goto normal;

	if (IS_ERR(pp) && PTR_ERR(pp) == -EINPROGRESS) {
		ret = GRO_CONSUMED;
		goto ok;
	}

	same_flow = NAPI_GRO_CB(skb)->same_flow;
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;

	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
		napi->gro_count--;
	}

	if (same_flow)
		goto ok;

	if (NAPI_GRO_CB(skb)->flush)
		goto normal;

	if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
		struct sk_buff *nskb = napi->gro_list;

		/* locate the end of the list to select the 'oldest' flow */
		while (nskb->next) {
			pp = &nskb->next;
			nskb = *pp;
		}
		*pp = NULL;
		nskb->next = NULL;
		napi_gro_complete(nskb);
	} else {
		napi->gro_count++;
	}
	NAPI_GRO_CB(skb)->count = 1;
	NAPI_GRO_CB(skb)->age = jiffies;
	NAPI_GRO_CB(skb)->last = skb;
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
	skb->next = napi->gro_list;
	napi->gro_list = skb;
	ret = GRO_HELD;

pull:
	grow = skb_gro_offset(skb) - skb_headlen(skb);
	if (grow > 0)
		gro_pull_from_frag0(skb, grow);
ok:
	return ret;

normal:
	ret = GRO_NORMAL;
	goto pull;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
322
53.94%
11
34.38%
Eric Dumazet
105
17.59%
7
21.88%
Tom Herbert
99
16.58%
4
12.50%
Steffen Klassert
24
4.02%
1
3.12%
Alexander Duyck
18
3.02%
2
6.25%
Sabrina Dubroca
9
1.51%
1
3.12%
Or Gerlitz
8
1.34%
1
3.12%
Vlad Yasevich
6
1.01%
2
6.25%
Ben Hutchings
4
0.67%
1
3.12%
Jesse Gross
1
0.17%
1
3.12%
Rami Rosen
1
0.17%
1
3.12%
Total
597
100.00%
32
100.00%



struct packet_offload *gro_find_receive_by_type(__be16 type)
{
	struct list_head *offload_head = &offload_base;
	struct packet_offload *ptype;

	list_for_each_entry_rcu(ptype, offload_head, list) {
		if (ptype->type != type || !ptype->callbacks.gro_receive)
			continue;
		return ptype;
	}
	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerry Chu
55
100.00%
1
100.00%
Total
55
100.00%
1
100.00%


EXPORT_SYMBOL(gro_find_receive_by_type);



struct packet_offload *gro_find_complete_by_type(__be16 type)
{
	struct list_head *offload_head = &offload_base;
	struct packet_offload *ptype;

	list_for_each_entry_rcu(ptype, offload_head, list) {
		if (ptype->type != type || !ptype->callbacks.gro_complete)
			continue;
		return ptype;
	}
	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jerry Chu
55
100.00%
1
100.00%
Total
55
100.00%
1
100.00%


EXPORT_SYMBOL(gro_find_complete_by_type);



static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
{
	switch (ret) {
	case GRO_NORMAL:
		if (netif_receive_skb_internal(skb))
			ret = GRO_DROP;
		break;

	case GRO_DROP:
		kfree_skb(skb);
		break;

	case GRO_MERGED_FREE:
		if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) {
			skb_dst_drop(skb);
			secpath_reset(skb);
			kmem_cache_free(skbuff_head_cache, skb);
		} else {
			__kfree_skb(skb);
		}
		break;

	case GRO_HELD:
	case GRO_MERGED:
	case GRO_CONSUMED:
		break;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
36
36.36%
3
25.00%
Eric Dumazet
26
26.26%
2
16.67%
Ben Hutchings
19
19.19%
3
25.00%
Jesse Gross
9
9.09%
1
8.33%
Steffen Klassert
8
8.08%
2
16.67%
Rami Rosen
1
1.01%
1
8.33%
Total
99
100.00%
12
100.00%



gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
	skb_mark_napi_id(skb, napi);
	trace_napi_gro_receive_entry(skb);

	skb_gro_reset_offset(skb);

	return napi_skb_finish(dev_gro_receive(napi, skb), skb);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
29
64.44%
5
45.45%
Eric Dumazet
13
28.89%
3
27.27%
Ben Hutchings
2
4.44%
2
18.18%
Simon Horman
1
2.22%
1
9.09%
Total
45
100.00%
11
100.00%


EXPORT_SYMBOL(napi_gro_receive);



static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
{
	if (unlikely(skb->pfmemalloc)) {
		consume_skb(skb);
		return;
	}
	__skb_pull(skb, skb_headlen(skb));
	/* restore the reserve we had after netdev_alloc_skb_ip_align() */
	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
	skb->vlan_tci = 0;
	skb->dev = napi->dev;
	skb->skb_iif = 0;
	skb->encapsulation = 0;
	skb_shinfo(skb)->gso_type = 0;
	skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
	secpath_reset(skb);

	napi->skb = skb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
51
43.97%
2
20.00%
Eric Dumazet
32
27.59%
3
30.00%
Jerry Chu
15
12.93%
1
10.00%
Andy Gospodarek
6
5.17%
1
10.00%
Jesse Gross
6
5.17%
1
10.00%
Steffen Klassert
5
4.31%
1
10.00%
Stephen Hemminger
1
0.86%
1
10.00%
Total
116
100.00%
10
100.00%



struct sk_buff *napi_get_frags(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
		skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
		if (skb) {
			napi->skb = skb;
			skb_mark_napi_id(skb, napi);
		}
	}
	return skb;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
44
74.58%
4
50.00%
Eric Dumazet
14
23.73%
3
37.50%
Alexander Duyck
1
1.69%
1
12.50%
Total
59
100.00%
8
100.00%


EXPORT_SYMBOL(napi_get_frags);



static gro_result_t napi_frags_finish(struct napi_struct *napi,
				      struct sk_buff *skb,
				      gro_result_t ret)
{
	switch (ret) {
	case GRO_NORMAL:
	case GRO_HELD:
		__skb_push(skb, ETH_HLEN);
		skb->protocol = eth_type_trans(skb, skb->dev);
		if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
			ret = GRO_DROP;
		break;

	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;

	case GRO_MERGED:
	case GRO_CONSUMED:
		break;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
42
46.15%
2
25.00%
Eric Dumazet
27
29.67%
1
12.50%
Ben Hutchings
18
19.78%
3
37.50%
Steffen Klassert
3
3.30%
1
12.50%
Rami Rosen
1
1.10%
1
12.50%
Total
91
100.00%
8
100.00%

/* Upper GRO stack assumes network header starts at gro_offset=0
 * Drivers could call both napi_gro_frags() and napi_gro_receive()
 * We copy ethernet header into skb->data to have a common layout.
 */


static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	const struct ethhdr *eth;
	unsigned int hlen = sizeof(*eth);

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

	eth = skb_gro_header_fast(skb, 0);
	if (unlikely(skb_gro_header_hard(skb, hlen))) {
		eth = skb_gro_header_slow(skb, hlen, 0);
		if (unlikely(!eth)) {
			net_warn_ratelimited("%s: dropping impossible skb from %s\n",
					     __func__, napi->dev->name);
			napi_reuse_skb(napi, skb);
			return NULL;
		}
	} else {
		gro_pull_from_frag0(skb, hlen);
		NAPI_GRO_CB(skb)->frag0 += hlen;
		NAPI_GRO_CB(skb)->frag0_len -= hlen;
	}
	__skb_pull(skb, hlen);

	/*
         * This works because the only protocols we care about don't require
         * special handling.
         * We'll fix it up properly in napi_frags_finish()
         */
	skb->protocol = eth->h_proto;

	return skb;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
92
54.76%
2
33.33%
Herbert Xu
54
32.14%
2
33.33%
Aaron Conole
13
7.74%
1
16.67%
Jerry Chu
9
5.36%
1
16.67%
Total
168
100.00%
6
100.00%



gro_result_t napi_gro_frags(struct napi_struct *napi)
{
	struct sk_buff *skb = napi_frags_skb(napi);

	if (!skb)
		return GRO_DROP;

	trace_napi_gro_frags_entry(skb);

	return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
}
Contributors
Person
Tokens
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CommitProp
Herbert Xu
40
83.33%
4
57.14%
Ben Hutchings
7
14.58%
2
28.57%
Eric Dumazet
1
2.08%
1
14.29%
Total
48
100.00%
7
100.00%


EXPORT_SYMBOL(napi_gro_frags);

/* Compute the checksum from gro_offset and return the folded value
 * after adding in any pseudo checksum.
 */


__sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
{
	__wsum wsum;
	__sum16 sum;

	wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);

	/* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
	sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
	if (likely(!sum)) {
		if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
		    !skb->csum_complete_sw)
			netdev_rx_csum_fault(skb->dev);
	}

	NAPI_GRO_CB(skb)->csum = wsum;
	NAPI_GRO_CB(skb)->csum_valid = 1;

	return sum;
}
Contributors
Person
Tokens
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Tom Herbert
107
100.00%
1
100.00%
Total
107
100.00%
1
100.00%


EXPORT_SYMBOL(__skb_gro_checksum_complete);

/*
 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
 * Note: called with local irq disabled, but exits with local irq enabled.
 */


static void net_rps_action_and_irq_enable(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *remsd = sd->rps_ipi_list;

	if (remsd) {
		sd->rps_ipi_list = NULL;

		local_irq_enable();

		/* Send pending IPI's to kick RPS processing on remote cpus. */
		while (remsd) {
			struct softnet_data *next = remsd->rps_ipi_next;

			if (cpu_online(remsd->cpu))
				smp_call_function_single_async(remsd->cpu,
							   &remsd->csd);
			remsd = next;
		}
	} else
#endif
		local_irq_enable();
}

Contributors
Person
Tokens
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CommitProp
Eric Dumazet
84
98.82%
1
50.00%
Frédéric Weisbecker
1
1.18%
1
50.00%
Total
85
100.00%
2
100.00%



static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	return sd->rps_ipi_list != NULL;
#else
	return false;
#endif
}

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Eric Dumazet
28
100.00%
1
100.00%
Total
28
100.00%
1
100.00%



static int process_backlog(struct napi_struct *napi, int quota)
{
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
	bool again = true;
	int work = 0;

	/* Check if we have pending ipi, its better to send them now,
         * not waiting net_rx_action() end.
         */
	if (sd_has_rps_ipi_waiting(sd)) {
		local_irq_disable();
		net_rps_action_and_irq_enable(sd);
	}

	napi->weight = dev_rx_weight;
	while (again) {
		struct sk_buff *skb;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			rcu_read_lock();
			__netif_receive_skb(skb);
			rcu_read_unlock();
			input_queue_head_incr(sd);
			if (++work >= quota)
				return work;

		}

		local_irq_disable();
		rps_lock(sd);
		if (skb_queue_empty(&sd->input_pkt_queue)) {
			/*
                         * Inline a custom version of __napi_complete().
                         * only current cpu owns and manipulates this napi,
                         * and NAPI_STATE_SCHED is the only possible flag set
                         * on backlog.
                         * We can use a plain write instead of clear_bit(),
                         * and we dont need an smp_mb() memory barrier.
                         */
			napi->state = 0;
			again = false;
		} else {
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
		}
		rps_unlock(sd);
		local_irq_enable();
	}

	return work;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Changli Gao
46
26.44%
2
15.38%
Herbert Xu
40
22.99%
1
7.69%
Eric Dumazet
33
18.97%
4
30.77%
Tom Herbert
27
15.52%
3
23.08%
Paolo Abeni
21
12.07%
1
7.69%
Julian Anastasov
6
3.45%
1
7.69%
Matthias Tafelmeier
1
0.57%
1
7.69%
Total
174
100.00%
13
100.00%

/**
 * __napi_schedule - schedule for receive
 * @n: entry to schedule
 *
 * The entry's receive function will be scheduled to run.
 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
 */


void __napi_schedule(struct napi_struct *n)
{
	unsigned long flags;

	local_irq_save(flags);
	____napi_schedule(this_cpu_ptr(&softnet_data), n);
	local_irq_restore(flags);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
30
85.71%
1
33.33%
Eric Dumazet
3
8.57%
1
33.33%
Christoph Lameter
2
5.71%
1
33.33%
Total
35
100.00%
3
100.00%


EXPORT_SYMBOL(__napi_schedule);

/**
 *      napi_schedule_prep - check if napi can be scheduled
 *      @n: napi context
 *
 * Test if NAPI routine is already running, and if not mark
 * it as running.  This is used as a condition variable
 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
 */


bool napi_schedule_prep(struct napi_struct *n)
{
	unsigned long val, new;

	do {
		val = READ_ONCE(n->state);
		if (unlikely(val & NAPIF_STATE_DISABLE))
			return false;
		new = val | NAPIF_STATE_SCHED;

		/* Sets STATE_MISSED bit if STATE_SCHED was already set
                 * This was suggested by Alexander Duyck, as compiler
                 * emits better code than :
                 * if (val & NAPIF_STATE_SCHED)
                 *     new |= NAPIF_STATE_MISSED;
                 */
		new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED *
						   NAPIF_STATE_MISSED;
	} while (cmpxchg(&n->state, val, new) != val);

	return !(val & NAPIF_STATE_SCHED);
}
Contributors
Person
Tokens
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CommitProp
Eric Dumazet
84
100.00%
1
100.00%
Total
84
100.00%
1
100.00%


EXPORT_SYMBOL(napi_schedule_prep);

/**
 * __napi_schedule_irqoff - schedule for receive
 * @n: entry to schedule
 *
 * Variant of __napi_schedule() assuming hard irqs are masked
 */


void __napi_schedule_irqoff(struct napi_struct *n)
{
	____napi_schedule(this_cpu_ptr(&softnet_data), n);
}
Contributors
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Eric Dumazet
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%


EXPORT_SYMBOL(__napi_schedule_irqoff);



bool napi_complete_done(struct napi_struct *n, int work_done)
{
	unsigned long flags, val, new;

	/*
         * 1) Don't let napi dequeue from the cpu poll list
         *    just in case its running on a different cpu.
         * 2) If we are busy polling, do nothing here, we have
         *    the guarantee we will be called later.
         */
	if (unlikely(n->state & (NAPIF_STATE_NPSVC |
				 NAPIF_STATE_IN_BUSY_POLL)))
		return false;

	if (n->gro_list) {
		unsigned long timeout = 0;

		if (work_done)
			timeout = n->dev->gro_flush_timeout;

		if (timeout)
			hrtimer_start(&n->timer, ns_to_ktime(timeout),
				      HRTIMER_MODE_REL_PINNED);
		else
			napi_gro_flush(n, false);
	}
	if (unlikely(!list_empty(&n->poll_list))) {
		/* If n->poll_list is not empty, we need to mask irqs */
		local_irq_save(flags);
		list_del_init(&n->poll_list);
		local_irq_restore(flags);
	}

	do {
		val = READ_ONCE(n->state);

		WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));

		new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED);

		/* If STATE_MISSED was set, leave STATE_SCHED set,
                 * because we will call napi->poll() one more time.
                 * This C code was suggested by Alexander Duyck to help gcc.
                 */
		new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED *
						    NAPIF_STATE_SCHED;
	} while (cmpxchg(&n->state, val, new) != val);

	if (unlikely(val & NAPIF_STATE_MISSED)) {
		__napi_schedule(n);
		return false;
	}

	return true;
}
Contributors
Person
Tokens
Prop
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CommitProp
Eric Dumazet
173
81.22%
7
77.78%
Herbert Xu
27
12.68%
1
11.11%
Stephen Hemminger
13
6.10%
1
11.11%
Total
213
100.00%
9
100.00%


EXPORT_SYMBOL(napi_complete_done);

/* must be called under rcu_read_lock(), as we dont take a reference */


static struct napi_struct *napi_by_id(unsigned int napi_id)
{
	unsigned int hash = napi_id % HASH_SIZE(napi_hash);
	struct napi_struct *napi;

	hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
		if (napi->napi_id == napi_id)
			return napi;

	return NULL;
}

Contributors
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Eliezer Tamir
49
98.00%
1
50.00%
Eric Dumazet
1
2.00%
1
50.00%
Total
50
100.00%
2
100.00%

#if defined(CONFIG_NET_RX_BUSY_POLL)


#define BUSY_POLL_BUDGET 8



static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock)
{
	int rc;

	/* Busy polling means there is a high chance device driver hard irq
         * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was
         * set in napi_schedule_prep().
         * Since we are about to call napi->poll() once more, we can safely
         * clear NAPI_STATE_MISSED.
         *
         * Note: x86 could use a single "lock and ..." instruction
         * to perform these two clear_bit()
         */
	clear_bit(NAPI_STATE_MISSED, &napi->state);
	clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state);

	local_bh_disable();

	/* All we really want here is to re-enable device interrupts.
         * Ideally, a new ndo_busy_poll_stop() could avoid another round.
         */
	rc = napi->poll(napi, BUSY_POLL_BUDGET);
	netpoll_poll_unlock(have_poll_lock);
	if (rc == BUSY_POLL_BUDGET)
		__napi_schedule(napi);
	local_bh_enable();
	if (local_softirq_pending())
		do_softirq();
}

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Eric Dumazet
81
100.00%
2
100.00%
Total
81
100.00%
2
100.00%



bool sk_busy_loop(struct sock *sk, int nonblock)
{
	unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0;
	int (*napi_poll)(struct napi_struct *napi, int budget);
	void *have_poll_lock = NULL;
	struct napi_struct *napi;
	int rc;

restart:
	rc = false;
	napi_poll = NULL;

	rcu_read_lock();

	napi = napi_by_id(sk->sk_napi_id);
	if (!napi)
		goto out;

	preempt_disable();
	for (;;) {
		rc = 0;
		local_bh_disable();
		if (!napi_poll) {
			unsigned long val = READ_ONCE(napi->state);

			/* If multiple threads are competing for this napi,
                         * we avoid dirtying napi->state as much as we can.
                         */
			if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED |
				   NAPIF_STATE_IN_BUSY_POLL))
				goto count;
			if (cmpxchg(&napi->state, val,
				    val | NAPIF_STATE_IN_BUSY_POLL |
					  NAPIF_STATE_SCHED) != val)
				goto count;
			have_poll_lock = netpoll_poll_lock(napi);
			napi_poll = napi->poll;
		}
		rc = napi_poll(napi, BUSY_POLL_BUDGET);
		trace_napi_poll(napi, rc, BUSY_POLL_BUDGET);
count:
		if (rc > 0)
			__NET_ADD_STATS(sock_net(sk),
					LINUX_MIB_BUSYPOLLRXPACKETS, rc);
		local_bh_enable();

		if (nonblock || !skb_queue_empty(&sk->sk_receive_queue) ||
		    busy_loop_timeout(end_time))
			break;

		if (unlikely(need_resched())) {
			if (napi_poll)
				busy_poll_stop(napi, have_poll_lock);
			preempt_enable();
			rcu_read_unlock();
			cond_resched();
			rc = !skb_queue_empty(&sk->sk_receive_queue);
			if (rc || busy_loop_timeout(end_time))
				return rc;
			goto restart;
		}
		cpu_relax();
	}
	if (napi_poll)
		busy_poll_stop(napi, have_poll_lock);
	preempt_enable();
	rc = !skb_queue_empty(&sk->sk_receive_queue);
out:
	rcu_read_unlock();
	return rc;
}
Contributors
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Eric Dumazet
318
97.85%
5
62.50%
Jesper Dangaard Brouer
4
1.23%
1
12.50%
Eliezer Tamir
2
0.62%
1
12.50%
Linus Torvalds
1
0.31%
1
12.50%
Total
325
100.00%
8
100.00%


EXPORT_SYMBOL(sk_busy_loop);

#endif /* CONFIG_NET_RX_BUSY_POLL */



static void napi_hash_add(struct napi_struct *napi)
{
	if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
	    test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
		return;

	spin_lock(&napi_hash_lock);

	/* 0..NR_CPUS+1 range is reserved for sender_cpu use */
	do {
		if (unlikely(++napi_gen_id < NR_CPUS + 1))
			napi_gen_id = NR_CPUS + 1;
	} while (napi_by_id(napi_gen_id));
	napi->napi_id = napi_gen_id;

	hlist_add_head_rcu(&napi->napi_hash_node,
			   &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);

	spin_unlock(&napi_hash_lock);
}

Contributors
Person
Tokens
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CommitProp
Eliezer Tamir
69
66.99%
1
25.00%
Eric Dumazet
34
33.01%
3
75.00%
Total
103
100.00%
4
100.00%

/* Warning : caller is responsible to make sure rcu grace period
 * is respected before freeing memory containing @napi
 */


bool napi_hash_del(struct napi_struct *napi)
{
	bool rcu_sync_needed = false;

	spin_lock(&napi_hash_lock);

	if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) {
		rcu_sync_needed = true;
		hlist_del_rcu(&napi->napi_hash_node);
	}
	spin_unlock(&napi_hash_lock);
	return rcu_sync_needed;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eliezer Tamir
41
73.21%
1
50.00%
Eric Dumazet
15
26.79%
1
50.00%
Total
56
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(napi_hash_del);



static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
{
	struct napi_struct *napi;

	napi = container_of(timer, struct napi_struct, timer);

	/* Note : we use a relaxed variant of napi_schedule_prep() not setting
         * NAPI_STATE_MISSED, since we do not react to a device IRQ.
         */
	if (napi->gro_list && !napi_disable_pending(napi) &&
	    !test_and_set_bit(NAPI_STATE_SCHED, &napi->state))
		__napi_schedule_irqoff(napi);

	return HRTIMER_NORESTART;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
58
95.08%
2
50.00%
David S. Miller
2
3.28%
1
25.00%
Herbert Xu
1
1.64%
1
25.00%
Total
61
100.00%
4
100.00%



void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight)
{
	INIT_LIST_HEAD(&napi->poll_list);
	hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
	napi->timer.function = napi_watchdog;
	napi->gro_count = 0;
	napi->gro_list = NULL;
	napi->skb = NULL;
	napi->poll = poll;
	if (weight > NAPI_POLL_WEIGHT)
		pr_err_once("netif_napi_add() called with weight %d on device %s\n",
			    weight, dev->name);
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
#ifdef CONFIG_NETPOLL
	napi->poll_owner = -1;
#endif
	set_bit(NAPI_STATE_SCHED, &napi->state);
	napi_hash_add(napi);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
80
52.63%
3
27.27%
Eric Dumazet
42
27.63%
3
27.27%
David S. Miller
16
10.53%
1
9.09%
Stephen Hemminger
10
6.58%
2
18.18%
Linus Torvalds (pre-git)
3
1.97%
1
9.09%
Andi Kleen
1
0.66%
1
9.09%
Total
152
100.00%
11
100.00%


EXPORT_SYMBOL(netif_napi_add);



void napi_disable(struct napi_struct *n)
{
	might_sleep();
	set_bit(NAPI_STATE_DISABLE, &n->state);

	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
		msleep(1);
	while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
		msleep(1);

	hrtimer_cancel(&n->timer);

	clear_bit(NAPI_STATE_DISABLE, &n->state);
}
Contributors
Person
Tokens
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Commits
CommitProp
Eric Dumazet
58
77.33%
1
50.00%
Neil Horman
17
22.67%
1
50.00%
Total
75
100.00%
2
100.00%


EXPORT_SYMBOL(napi_disable);

/* Must be called in process context */


void netif_napi_del(struct napi_struct *napi)
{
	might_sleep();
	if (napi_hash_del(napi))
		synchronize_net();
	list_del_init(&napi->dev_list);
	napi_free_frags(napi);

	kfree_skb_list(napi->gro_list);
	napi->gro_list = NULL;
	napi->gro_count = 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
25
45.45%
4
36.36%
Eric Dumazet
15
27.27%
2
18.18%
Stephen Hemminger
9
16.36%
1
9.09%
Linus Torvalds (pre-git)
3
5.45%
2
18.18%
David S. Miller
2
3.64%
1
9.09%
Peter P. Waskiewicz Jr
1
1.82%
1
9.09%
Total
55
100.00%
11
100.00%


EXPORT_SYMBOL(netif_napi_del);



static int napi_poll(struct napi_struct *n, struct list_head *repoll)
{
	void *have;
	int work, weight;

	list_del_init(&n->poll_list);

	have = netpoll_poll_lock(n);

	weight = n->weight;

	/* This NAPI_STATE_SCHED test is for avoiding a race
         * with netpoll's poll_napi().  Only the entity which
         * obtains the lock and sees NAPI_STATE_SCHED set will
         * actually make the ->poll() call.  Therefore we avoid
         * accidentally calling ->poll() when NAPI is not scheduled.
         */
	work = 0;
	if (test_bit(NAPI_STATE_SCHED, &n->state)) {
		work = n->poll(n, weight);
		trace_napi_poll(n, work, weight);
	}

	WARN_ON_ONCE(work > weight);

	if (likely(work < weight))
		goto out_unlock;

	/* Drivers must not modify the NAPI state if they
         * consume the entire weight.  In such cases this code
         * still "owns" the NAPI instance and therefore can
         * move the instance around on the list at-will.
         */
	if (unlikely(napi_disable_pending(n))) {
		napi_complete(n);
		goto out_unlock;
	}

	if (n->gro_list) {
		/* flush too old packets
                 * If HZ < 1000, flush all packets.
                 */
		napi_gro_flush(n, HZ >= 1000);
	}

	/* Some drivers may have called napi_schedule
         * prior to exhausting their budget.
         */
	if (unlikely(!list_empty(&n->poll_list))) {
		pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
			     n->dev ? n->dev->name : "backlog");
		goto out_unlock;
	}

	list_add_tail(&n->poll_list, repoll);

out_unlock:
	netpoll_poll_unlock(have);

	return work;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
65
32.50%
3
23.08%
David S. Miller
50
25.00%
3
23.08%
Stephen Hemminger
28
14.00%
1
7.69%
Eric Dumazet
28
14.00%
2
15.38%
Matt Mackall
18
9.00%
2
15.38%
Neil Horman
7
3.50%
1
7.69%
Jesper Dangaard Brouer
4
2.00%
1
7.69%
Total
200
100.00%
13
100.00%



static __latent_entropy void net_rx_action(struct softirq_action *h)
{
	struct softnet_data *sd = this_cpu_ptr(&softnet_data);
	unsigned long time_limit = jiffies + 2;
	int budget = netdev_budget;
	LIST_HEAD(list);
	LIST_HEAD(repoll);

	local_irq_disable();
	list_splice_init(&sd->poll_list, &list);
	local_irq_enable();

	for (;;) {
		struct napi_struct *n;

		if (list_empty(&list)) {
			if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
				goto out;
			break;
		}

		n = list_first_entry(&list, struct napi_struct, poll_list);
		budget -= napi_poll(n, &repoll);

		/* If softirq window is exhausted then punt.
                 * Allow this to run for 2 jiffies since which will allow
                 * an average latency of 1.5/HZ.
                 */
		if (unlikely(budget <= 0 ||
			     time_after_eq(jiffies, time_limit))) {
			sd->time_squeeze++;
			break;
		}
	}

	local_irq_disable();

	list_splice_tail_init(&sd->poll_list, &list);
	list_splice_tail(&repoll, &list);
	list_splice(&list, &sd->poll_list);
	if (!list_empty(&sd->poll_list))
		__raise_softirq_irqoff(NET_RX_SOFTIRQ);

	net_rps_action_and_irq_enable(sd);
out:
	__kfree_skb_flush();
}

Contributors
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Tokens
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Herbert Xu
145
68.72%
3
33.33%
Eric Dumazet
63
29.86%
3
33.33%
Emese Revfy
1
0.47%
1
11.11%
Linus Torvalds (pre-git)
1
0.47%
1
11.11%
Tom Herbert
1
0.47%
1
11.11%
Total
211
100.00%
9
100.00%


struct netdev_adjacent {
	
struct net_device *dev;

	/* upper master flag, there can only be one master device per list */
	
bool master;

	/* counter for the number of times this device was added to us */
	
u16 ref_nr;

	/* private field for the users */
	
void *private;

	
struct list_head list;
	
struct rcu_head rcu;
};



static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
						 struct list_head *adj_list)
{
	struct netdev_adjacent *adj;

	list_for_each_entry(adj, adj_list, list) {
		if (adj->dev == adj_dev)
			return adj;
	}
	return NULL;
}

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Veaceslav Falico
16
34.04%
4
57.14%
Américo Wang
14
29.79%
1
14.29%
Patrick McHardy
12
25.53%
1
14.29%
Wang Chen
5
10.64%
1
14.29%
Total
47
100.00%
7
100.00%



static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
{
	struct net_device *dev = data;

	return upper_dev == dev;
}

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David Ahern
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%

/**
 * netdev_has_upper_dev - Check if device is linked to an upper device
 * @dev: device
 * @upper_dev: upper device to check
 *
 * Find out if a device is linked to specified upper device and return true
 * in case it is. Note that this checks only immediate upper device,
 * not through a complete stack of devices. The caller must hold the RTNL lock.
 */


bool netdev_has_upper_dev(struct net_device *dev,
			  struct net_device *upper_dev)
{
	ASSERT_RTNL();

	return netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
					     upper_dev);
}
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Linus Torvalds (pre-git)
8
28.57%
2
28.57%
Américo Wang
7
25.00%
1
14.29%
David Ahern
5
17.86%
1
14.29%
Wang Chen
4
14.29%
1
14.29%
Patrick McHardy
3
10.71%
1
14.29%
Veaceslav Falico
1
3.57%
1
14.29%
Total
28
100.00%
7
100.00%


EXPORT_SYMBOL(netdev_has_upper_dev);

/**
 * netdev_has_upper_dev_all - Check if device is linked to an upper device
 * @dev: device
 * @upper_dev: upper device to check
 *
 * Find out if a device is linked to specified upper device and return true
 * in case it is. Note that this checks the entire upper device chain.
 * The caller must hold rcu lock.
 */



bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
				  struct net_device *upper_dev)
{
	return !!netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
					       upper_dev);
}
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27
100.00%
1
100.00%
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27
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);

/**
 * netdev_has_any_upper_dev - Check if device is linked to some device
 * @dev: device
 *
 * Find out if a device is linked to an upper device and return true in case
 * it is. The caller must hold the RTNL lock.
 */


static bool netdev_has_any_upper_dev(struct net_device *dev)
{
	ASSERT_RTNL();

	return !list_empty(&dev->adj_list.upper);
}

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Américo Wang
14
53.85%
1
12.50%
Patrick McHardy
6
23.08%
2
25.00%
Veaceslav Falico
2
7.69%
1
12.50%
Linus Torvalds (pre-git)
1
3.85%
1
12.50%
Wang Chen
1
3.85%
1
12.50%
David Ahern
1
3.85%
1
12.50%
Stephen Hemminger
1
3.85%
1
12.50%
Total
26
100.00%
8
100.00%

/**
 * netdev_master_upper_dev_get - Get master upper device
 * @dev: device
 *
 * Find a master upper device and return pointer to it or NULL in case
 * it's not there. The caller must hold the RTNL lock.
 */


struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
{
	struct netdev_adjacent *upper;

	ASSERT_RTNL();

	if (list_empty(&dev->adj_list.upper))
		return NULL;

	upper = list_first_entry(&dev->adj_list.upper,
				 struct netdev_adjacent, list);
	if (likely(upper->master))
		return upper->dev;
	return NULL;
}
Contributors
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Tokens
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CommitProp
Américo Wang
30
43.48%
1
14.29%
Patrick McHardy
26
37.68%
1
14.29%
Veaceslav Falico
8
11.59%
2
28.57%
Stephen Hemminger
3
4.35%
1
14.29%
Jiri Pirko
2
2.90%
2
28.57%
Total
69
100.00%
7
100.00%


EXPORT_SYMBOL(netdev_master_upper_dev_get);

/**
 * netdev_has_any_lower_dev - Check if device is linked to some device
 * @dev: device
 *
 * Find out if a device is linked to a lower device and return true in case
 * it is. The caller must hold the RTNL lock.
 */


static bool netdev_has_any_lower_dev(struct net_device *dev)
{
	ASSERT_RTNL();

	return !list_empty(&dev->adj_list.lower);
}

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David Ahern
26
100.00%
1
100.00%
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26
100.00%
1
100.00%



void *netdev_adjacent_get_private(struct list_head *adj_list)
{
	struct netdev_adjacent *adj;

	adj = list_entry(adj_list, struct netdev_adjacent, list);

	return adj->private;
}
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Veaceslav Falico
33
100.00%
1
100.00%
Total
33
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_adjacent_get_private);

/**
 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
 * @dev: device
 * @iter: list_head ** of the current position
 *
 * Gets the next device from the dev's upper list, starting from iter
 * position. The caller must hold RCU read lock.
 */


struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
						 struct list_head **iter)
{
	struct netdev_adjacent *upper;

	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());

	upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);

	if (&upper->list == &dev->adj_list.upper)
		return NULL;

	*iter = &upper->list;

	return upper->dev;
}
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Vlad Yasevich
81
100.00%
1
100.00%
Total
81
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);



static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev,
						    struct list_head **iter)
{
	struct netdev_adjacent *upper;

	WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());

	upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);

	if (&upper->list == &dev->adj_list.upper)
		return NULL;

	*iter = &upper->list;

	return upper->dev;
}

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David Ahern
82
100.00%
1
100.00%
Total
82
100.00%
1
100.00%



int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
				  int (*fn)(struct net_device *dev,
					    void *data),
				  void *data)
{
	struct net_device *udev;
	struct list_head *iter;
	int ret;

	for (iter = &dev->adj_list.upper,
	     udev = netdev_next_upper_dev_rcu(dev, &iter);
	     udev;
	     udev = netdev_next_upper_dev_rcu(dev, &iter)) {
		/* first is the upper device itself */
		ret = fn(udev, data);
		if (ret)
			return ret;

		/* then look at all of its upper devices */
		ret = netdev_walk_all_upper_dev_rcu(udev, fn, data);
		if (ret)
			return ret;
	}

	return 0;
}
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David Ahern
117
100.00%
1
100.00%
Total
117
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu);

/**
 * netdev_lower_get_next_private - Get the next ->private from the
 *                                 lower neighbour list
 * @dev: device
 * @iter: list_head ** of the current position
 *
 * Gets the next netdev_adjacent->private from the dev's lower neighbour
 * list, starting from iter position. The caller must hold either hold the
 * RTNL lock or its own locking that guarantees that the neighbour lower
 * list will remain unchanged.
 */


void *netdev_lower_get_next_private(struct net_device *dev,
				    struct list_head **iter)
{
	struct netdev_adjacent *lower;

	lower = list_entry(*iter, struct netdev_adjacent, list);

	if (&lower->list == &dev->adj_list.lower)
		return NULL;

	*iter = lower->list.next;

	return lower->private;
}
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Veaceslav Falico
66
100.00%
1
100.00%
Total
66
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_lower_get_next_private);

/**
 * netdev_lower_get_next_private_rcu - Get the next ->private from the
 *                                     lower neighbour list, RCU
 *                                     variant
 * @dev: device
 * @iter: list_head ** of the current position
 *
 * Gets the next netdev_adjacent->private from the dev's lower neighbour
 * list, starting from iter position. The caller must hold RCU read lock.
 */


void *netdev_lower_get_next_private_rcu(struct net_device *dev,
					struct list_head **iter)
{
	struct netdev_adjacent *lower;

	WARN_ON_ONCE(!rcu_read_lock_held());

	lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);

	if (&lower->list == &dev->adj_list.lower)
		return NULL;

	*iter = &lower->list;

	return lower->private;
}
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Veaceslav Falico
76
100.00%
1
100.00%
Total
76
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);

/**
 * netdev_lower_get_next - Get the next device from the lower neighbour
 *                         list
 * @dev: device
 * @iter: list_head ** of the current position
 *
 * Gets the next netdev_adjacent from the dev's lower neighbour
 * list, starting from iter position. The caller must hold RTNL lock or
 * its own locking that guarantees that the neighbour lower
 * list will remain unchanged.
 */


void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
{
	struct netdev_adjacent *lower;

	lower = list_entry(*iter, struct netdev_adjacent, list);

	if (&lower->list == &dev->adj_list.lower)
		return NULL;

	*iter = lower->list.next;

	return lower->dev;
}
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Vlad Yasevich
64
96.97%
1
50.00%
Nikolay Aleksandrov
2
3.03%
1
50.00%
Total
66
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_lower_get_next);



static struct net_device *netdev_next_lower_dev(struct net_device *dev,
						struct list_head **iter)
{
	struct netdev_adjacent *lower;

	lower = list_entry((*iter)->next, struct netdev_adjacent, list);

	if (&lower->list == &dev->adj_list.lower)
		return NULL;

	*iter = &lower->list;

	return lower->dev;
}

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David Ahern
71
100.00%
2
100.00%
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71
100.00%
2
100.00%



int netdev_walk_all_lower_dev(struct net_device *dev,
			      int (*fn)(struct net_device *dev,
					void *data),
			      void *data)
{
	struct net_device *ldev;
	struct list_head *iter;
	int ret;

	for (iter = &dev->adj_list.lower,
	     ldev = netdev_next_lower_dev(dev, &iter);
	     ldev;
	     ldev = netdev_next_lower_dev(dev, &iter)) {
		/* first is the lower device itself */
		ret = fn(ldev, data);
		if (ret)
			return ret;

		/* then look at all of its lower devices */
		ret = netdev_walk_all_lower_dev(ldev, fn, data);
		if (ret)
			return ret;
	}

	return 0;
}
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David Ahern
117
100.00%
1
100.00%
Total
117
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev);



static struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
						    struct list_head **iter)
{
	struct netdev_adjacent *lower;

	lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
	if (&lower->list == &dev->adj_list.lower)
		return NULL;

	*iter = &lower->list;

	return lower->dev;
}

Contributors
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David Ahern
46
64.79%
2
66.67%
Jiri Pirko
25
35.21%
1
33.33%
Total
71
100.00%
3
100.00%



int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
				  int (*fn)(struct net_device *dev,
					    void *data),
				  void *data)
{
	struct net_device *ldev;
	struct list_head *iter;
	int ret;

	for (iter = &dev->adj_list.lower,
	     ldev = netdev_next_lower_dev_rcu(dev, &iter);
	     ldev;
	     ldev = netdev_next_lower_dev_rcu(dev, &iter)) {
		/* first is the lower device itself */
		ret = fn(ldev, data);
		if (ret)
			return ret;

		/* then look at all of its lower devices */
		ret = netdev_walk_all_lower_dev_rcu(ldev, fn, data);
		if (ret)
			return ret;
	}

	return 0;
}
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David Ahern
117
100.00%
1
100.00%
Total
117
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu);

/**
 * netdev_lower_get_first_private_rcu - Get the first ->private from the
 *                                     lower neighbour list, RCU
 *                                     variant
 * @dev: device
 *
 * Gets the first netdev_adjacent->private from the dev's lower neighbour
 * list. The caller must hold RCU read lock.
 */


void *netdev_lower_get_first_private_rcu(struct net_device *dev)
{
	struct netdev_adjacent *lower;

	lower = list_first_or_null_rcu(&dev->adj_list.lower,
			struct netdev_adjacent, list);
	if (lower)
		return lower->private;
	return NULL;
}
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Ding Tianhong
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);

/**
 * netdev_master_upper_dev_get_rcu - Get master upper device
 * @dev: device
 *
 * Find a master upper device and return pointer to it or NULL in case
 * it's not there. The caller must hold the RCU read lock.
 */


struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
{
	struct netdev_adjacent *upper;

	upper = list_first_or_null_rcu(&dev->adj_list.upper,
				       struct netdev_adjacent, list);
	if (upper && likely(upper->master))
		return upper->dev;
	return NULL;
}
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Américo Wang
28
52.83%
1
20.00%
Stephen Hemminger
14
26.42%
1
20.00%
Stefan Rompf
6
11.32%
1
20.00%
Veaceslav Falico
5
9.43%
2
40.00%
Total
53
100.00%
5
100.00%


EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);



static int netdev_adjacent_sysfs_add(struct net_device *dev,
			      struct net_device *adj_dev,
			      struct list_head *dev_list)
{
	char linkname[IFNAMSIZ+7];

	sprintf(linkname, dev_list == &dev->adj_list.upper ?
		"upper_%s" : "lower_%s", adj_dev->name);
	return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
				 linkname);
}
Contributors
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Veaceslav Falico
74
98.67%
1
50.00%
Rashika Kheria
1
1.33%
1
50.00%
Total
75
100.00%
2
100.00%



static void netdev_adjacent_sysfs_del(struct net_device *dev,
			       char *name,
			       struct list_head *dev_list)
{
	char linkname[IFNAMSIZ+7];

	sprintf(linkname, dev_list == &dev->adj_list.upper ?
		"upper_%s" : "lower_%s", name);
	sysfs_remove_link(&(dev->dev.kobj), linkname);
}

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Veaceslav Falico
61
98.39%
1
50.00%
Rashika Kheria
1
1.61%
1
50.00%
Total
62
100.00%
2
100.00%



static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
						 struct net_device *adj_dev,
						 struct list_head *dev_list)
{
	return (dev_list == &dev->adj_list.upper ||
		dev_list == &dev->adj_list.lower) &&
		net_eq(dev_net(dev), dev_net(adj_dev));
}

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Alexander Y. Fomichev
50
89.29%
1
50.00%
Veaceslav Falico
6
10.71%
1
50.00%
Total
56
100.00%
2
100.00%



static int __netdev_adjacent_dev_insert(struct net_device *dev,
					struct net_device *adj_dev,
					struct list_head *dev_list,
					void *private, bool master)
{
	struct netdev_adjacent *adj;
	int ret;

	adj = __netdev_find_adj(adj_dev, dev_list);

	if (adj) {
		adj->ref_nr += 1;
		pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n",
			 dev->name, adj_dev->name, adj->ref_nr);

		return 0;
	}

	adj = kmalloc(sizeof(*adj), GFP_KERNEL);
	if (!adj)
		return -ENOMEM;

	adj->dev = adj_dev;
	adj->master = master;
	adj->ref_nr = 1;
	adj->private = private;
	dev_hold(adj_dev);

	pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n",
		 dev->name, adj_dev->name, adj->ref_nr, adj_dev->name);

	if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
		ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
		if (ret)
			goto free_adj;
	}

	/* Ensure that master link is always the first item in list. */
	if (master) {
		ret = sysfs_create_link(&(dev->dev.kobj),
					&(adj_dev->dev.kobj), "master");
		if (ret)
			goto remove_symlinks;

		list_add_rcu(&adj->list, dev_list);
	} else {
		list_add_tail_rcu(&adj->list, dev_list);
	}

	return 0;

remove_symlinks:
	if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
		netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
free_adj:
	kfree(adj);
	dev_put(adj_dev);

	return ret;
}

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Veaceslav Falico
224
78.87%
7
41.18%
David Ahern
26
9.15%
2
11.76%
Américo Wang
10
3.52%
1
5.88%
Linus Torvalds (pre-git)
9
3.17%
2
11.76%
Nikolay Aleksandrov
5
1.76%
1
5.88%
Patrick McHardy
5
1.76%
2
11.76%
Alexander Y. Fomichev
4
1.41%
1
5.88%
Andrew Collins
1
0.35%
1
5.88%
Total
284
100.00%
17
100.00%



static void __netdev_adjacent_dev_remove(struct net_device *dev,
					 struct net_device *adj_dev,
					 u16 ref_nr,
					 struct list_head *dev_list)
{
	struct netdev_adjacent *adj;

	pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n",
		 dev->name, adj_dev->name, ref_nr);

	adj = __netdev_find_adj(adj_dev, dev_list);

	if (!adj) {
		pr_err("Adjacency does not exist for device %s from %s\n",
		       dev->name, adj_dev->name);
		WARN_ON(1);
		return;
	}

	if (adj->ref_nr > ref_nr) {
		pr_debug("adjacency: %s to %s ref_nr - %d = %d\n",
			 dev->name, adj_dev->name, ref_nr,
			 adj->ref_nr - ref_nr);
		adj->ref_nr -= ref_nr;
		return;
	}

	if (adj->master)
		sysfs_remove_link(&(dev->dev.kobj), "master");

	if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
		netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);

	list_del_rcu(&adj->list);
	pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n",
		 adj_dev->name, dev->name, adj_dev->name);
	dev_put(adj_dev);
	kfree_rcu(adj, rcu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
159
81.12%
6
54.55%
David Ahern
23
11.73%
1
9.09%
Andrew Collins
9
4.59%
1
9.09%
Alexander Y. Fomichev
4
2.04%
2
18.18%
Stephen Hemminger
1
0.51%
1
9.09%
Total
196
100.00%
11
100.00%



static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
					    struct net_device *upper_dev,
					    struct list_head *up_list,
					    struct list_head *down_list,
					    void *private, bool master)
{
	int ret;

	ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list,
					   private, master);
	if (ret)
		return ret;

	ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list,
					   private, false);
	if (ret) {
		__netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list);
		return ret;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
93
96.88%
3
50.00%
Andrew Collins
1
1.04%
1
16.67%
Stephen Hemminger
1
1.04%
1
16.67%
David Ahern
1
1.04%
1
16.67%
Total
96
100.00%
6
100.00%



static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
					       struct net_device *upper_dev,
					       u16 ref_nr,
					       struct list_head *up_list,
					       struct list_head *down_list)
{
	__netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
	__netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
43
84.31%
2
50.00%
Andrew Collins
7
13.73%
1
25.00%
Stephen Hemminger
1
1.96%
1
25.00%
Total
51
100.00%
4
100.00%



static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
						struct net_device *upper_dev,
						void *private, bool master)
{
	return __netdev_adjacent_dev_link_lists(dev, upper_dev,
						&dev->adj_list.upper,
						&upper_dev->adj_list.lower,
						private, master);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
48
97.96%
3
75.00%
Stephen Hemminger
1
2.04%
1
25.00%
Total
49
100.00%
4
100.00%



static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
						   struct net_device *upper_dev)
{
	__netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1,
					   &dev->adj_list.upper,
					   &upper_dev->adj_list.lower);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
36
92.31%
2
50.00%
Andrew Collins
2
5.13%
1
25.00%
Stephen Hemminger
1
2.56%
1
25.00%
Total
39
100.00%
4
100.00%



static int __netdev_upper_dev_link(struct net_device *dev,
				   struct net_device *upper_dev, bool master,
				   void *upper_priv, void *upper_info)
{
	struct netdev_notifier_changeupper_info changeupper_info;
	int ret = 0;

	ASSERT_RTNL();

	if (dev == upper_dev)
		return -EBUSY;

	/* To prevent loops, check if dev is not upper device to upper_dev. */
	if (netdev_has_upper_dev(upper_dev, dev))
		return -EBUSY;

	if (netdev_has_upper_dev(dev, upper_dev))
		return -EEXIST;

	if (master && netdev_master_upper_dev_get(dev))
		return -EBUSY;

	changeupper_info.upper_dev = upper_dev;
	changeupper_info.master = master;
	changeupper_info.linking = true;
	changeupper_info.upper_info = upper_info;

	ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
					    &changeupper_info.info);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

	ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
						   master);
	if (ret)
		return ret;

	ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
					    &changeupper_info.info);
	ret = notifier_to_errno(ret);
	if (ret)
		goto rollback;

	return 0;

rollback:
	__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
96
47.06%
3
20.00%
David Ahern
54
26.47%
1
6.67%
Jiri Pirko
21
10.29%
4
26.67%
Ido Schimmel
13
6.37%
1
6.67%
Américo Wang
9
4.41%
1
6.67%
Linus Torvalds (pre-git)
6
2.94%
3
20.00%
Patrick McHardy
3
1.47%
1
6.67%
Andrew Collins
2
0.98%
1
6.67%
Total
204
100.00%
15
100.00%

/**
 * netdev_upper_dev_link - Add a link to the upper device
 * @dev: device
 * @upper_dev: new upper device
 *
 * Adds a link to device which is upper to this one. The caller must hold
 * the RTNL lock. On a failure a negative errno code is returned.
 * On success the reference counts are adjusted and the function
 * returns zero.
 */


int netdev_upper_dev_link(struct net_device *dev,
			  struct net_device *upper_dev)
{
	return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
14
48.28%
1
25.00%
Patrick McHardy
11
37.93%
1
25.00%
Jiri Pirko
2
6.90%
1
25.00%
Veaceslav Falico
2
6.90%
1
25.00%
Total
29
100.00%
4
100.00%


EXPORT_SYMBOL(netdev_upper_dev_link);

/**
 * netdev_master_upper_dev_link - Add a master link to the upper device
 * @dev: device
 * @upper_dev: new upper device
 * @upper_priv: upper device private
 * @upper_info: upper info to be passed down via notifier
 *
 * Adds a link to device which is upper to this one. In this case, only
 * one master upper device can be linked, although other non-master devices
 * might be linked as well. The caller must hold the RTNL lock.
 * On a failure a negative errno code is returned. On success the reference
 * counts are adjusted and the function returns zero.
 */


int netdev_master_upper_dev_link(struct net_device *dev,
				 struct net_device *upper_dev,
				 void *upper_priv, void *upper_info)
{
	return __netdev_upper_dev_link(dev, upper_dev, true,
				       upper_priv, upper_info);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
17
45.95%
1
20.00%
Américo Wang
11
29.73%
1
20.00%
Jiri Pirko
8
21.62%
2
40.00%
Patrick McHardy
1
2.70%
1
20.00%
Total
37
100.00%
5
100.00%


EXPORT_SYMBOL(netdev_master_upper_dev_link);

/**
 * netdev_upper_dev_unlink - Removes a link to upper device
 * @dev: device
 * @upper_dev: new upper device
 *
 * Removes a link to device which is upper to this one. The caller must hold
 * the RTNL lock.
 */


void netdev_upper_dev_unlink(struct net_device *dev,
			     struct net_device *upper_dev)
{
	struct netdev_notifier_changeupper_info changeupper_info;

	ASSERT_RTNL();

	changeupper_info.upper_dev = upper_dev;
	changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
	changeupper_info.linking = false;

	call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
				      &changeupper_info.info);

	__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);

	call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
				      &changeupper_info.info);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
50
65.79%
3
42.86%
Patrick McHardy
13
17.11%
1
14.29%
Américo Wang
11
14.47%
1
14.29%
Veaceslav Falico
1
1.32%
1
14.29%
Linus Torvalds (pre-git)
1
1.32%
1
14.29%
Total
76
100.00%
7
100.00%


EXPORT_SYMBOL(netdev_upper_dev_unlink);

/**
 * netdev_bonding_info_change - Dispatch event about slave change
 * @dev: device
 * @bonding_info: info to dispatch
 *
 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
 * The caller must hold the RTNL lock.
 */


void netdev_bonding_info_change(struct net_device *dev,
				struct netdev_bonding_info *bonding_info)
{
	struct netdev_notifier_bonding_info	info;

	memcpy(&info.bonding_info, bonding_info,
	       sizeof(struct netdev_bonding_info));
	call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev,
				      &info.info);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Moni Shoua
47
100.00%
1
100.00%
Total
47
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_bonding_info_change);



static void netdev_adjacent_add_links(struct net_device *dev)
{
	struct netdev_adjacent *iter;

	struct net *net = dev_net(dev);

	list_for_each_entry(iter, &dev->adj_list.upper, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_add(iter->dev, dev,
					  &iter->dev->adj_list.lower);
		netdev_adjacent_sysfs_add(dev, iter->dev,
					  &dev->adj_list.upper);
	}

	list_for_each_entry(iter, &dev->adj_list.lower, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_add(iter->dev, dev,
					  &iter->dev->adj_list.upper);
		netdev_adjacent_sysfs_add(dev, iter->dev,
					  &dev->adj_list.lower);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Y. Fomichev
145
99.32%
1
50.00%
Eric Dumazet
1
0.68%
1
50.00%
Total
146
100.00%
2
100.00%



static void netdev_adjacent_del_links(struct net_device *dev)
{
	struct netdev_adjacent *iter;

	struct net *net = dev_net(dev);

	list_for_each_entry(iter, &dev->adj_list.upper, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_del(iter->dev, dev->name,
					  &iter->dev->adj_list.lower);
		netdev_adjacent_sysfs_del(dev, iter->dev->name,
					  &dev->adj_list.upper);
	}

	list_for_each_entry(iter, &dev->adj_list.lower, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_del(iter->dev, dev->name,
					  &iter->dev->adj_list.upper);
		netdev_adjacent_sysfs_del(dev, iter->dev->name,
					  &dev->adj_list.lower);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Alexander Y. Fomichev
153
99.35%
1
50.00%
Eric Dumazet
1
0.65%
1
50.00%
Total
154
100.00%
2
100.00%



void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
{
	struct netdev_adjacent *iter;

	struct net *net = dev_net(dev);

	list_for_each_entry(iter, &dev->adj_list.upper, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_del(iter->dev, oldname,
					  &iter->dev->adj_list.lower);
		netdev_adjacent_sysfs_add(iter->dev, dev,
					  &iter->dev->adj_list.lower);
	}

	list_for_each_entry(iter, &dev->adj_list.lower, list) {
		if (!net_eq(net, dev_net(iter->dev)))
			continue;
		netdev_adjacent_sysfs_del(iter->dev, oldname,
					  &iter->dev->adj_list.upper);
		netdev_adjacent_sysfs_add(iter->dev, dev,
					  &iter->dev->adj_list.upper);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
111
72.55%
2
66.67%
Alexander Y. Fomichev
42
27.45%
1
33.33%
Total
153
100.00%
3
100.00%



void *netdev_lower_dev_get_private(struct net_device *dev,
				   struct net_device *lower_dev)
{
	struct netdev_adjacent *lower;

	if (!lower_dev)
		return NULL;
	lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
	if (!lower)
		return NULL;

	return lower->private;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_lower_dev_get_private);




int dev_get_nest_level(struct net_device *dev)
{
	struct net_device *lower = NULL;
	struct list_head *iter;
	int max_nest = -1;
	int nest;

	ASSERT_RTNL();

	netdev_for_each_lower_dev(dev, lower, iter) {
		nest = dev_get_nest_level(lower);
		if (max_nest < nest)
			max_nest = nest;
	}

	return max_nest + 1;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Vlad Yasevich
64
96.97%
1
50.00%
Sabrina Dubroca
2
3.03%
1
50.00%
Total
66
100.00%
2
100.00%


EXPORT_SYMBOL(dev_get_nest_level);

/**
 * netdev_lower_change - Dispatch event about lower device state change
 * @lower_dev: device
 * @lower_state_info: state to dispatch
 *
 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
 * The caller must hold the RTNL lock.
 */


void netdev_lower_state_changed(struct net_device *lower_dev,
				void *lower_state_info)
{
	struct netdev_notifier_changelowerstate_info changelowerstate_info;

	ASSERT_RTNL();
	changelowerstate_info.lower_state_info = lower_state_info;
	call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
				      &changelowerstate_info.info);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_lower_state_changed);



static void dev_change_rx_flags(struct net_device *dev, int flags)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_change_rx_flags)
		ops->ndo_change_rx_flags(dev, flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
20
51.28%
1
33.33%
Stephen Hemminger
19
48.72%
2
66.67%
Total
39
100.00%
3
100.00%



static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
{
	unsigned int old_flags = dev->flags;
	kuid_t uid;
	kgid_t gid;

	ASSERT_RTNL();

	dev->flags |= IFF_PROMISC;
	dev->promiscuity += inc;
	if (dev->promiscuity == 0) {
		/*
                 * Avoid overflow.
                 * If inc causes overflow, untouch promisc and return error.
                 */
		if (inc < 0)
			dev->flags &= ~IFF_PROMISC;
		else {
			dev->promiscuity -= inc;
			pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
				dev->name);
			return -EOVERFLOW;
		}
	}
	if (dev->flags != old_flags) {
		pr_info("device %s %s promiscuous mode\n",
			dev->name,
			dev->flags & IFF_PROMISC ? "entered" : "left");
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
			audit_log(current->audit_context, GFP_ATOMIC,
				AUDIT_ANOM_PROMISCUOUS,
				"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
				dev->name, (dev->flags & IFF_PROMISC),
				(old_flags & IFF_PROMISC),
				from_kuid(&init_user_ns, audit_get_loginuid(current)),
				from_kuid(&init_user_ns, uid),
				from_kgid(&init_user_ns, gid),
				audit_get_sessionid(current));
		}

		dev_change_rx_flags(dev, IFF_PROMISC);
	}
	if (notify)
		__dev_notify_flags(dev, old_flags, IFF_PROMISC);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
168
75.68%
1
33.33%
Stephen Hemminger
38
17.12%
1
33.33%
Nicolas Dichtel
16
7.21%
1
33.33%
Total
222
100.00%
3
100.00%

/**
 *      dev_set_promiscuity     - update promiscuity count on a device
 *      @dev: device
 *      @inc: modifier
 *
 *      Add or remove promiscuity from a device. While the count in the device
 *      remains above zero the interface remains promiscuous. Once it hits zero
 *      the device reverts back to normal filtering operation. A negative inc
 *      value is used to drop promiscuity on the device.
 *      Return 0 if successful or a negative errno code on error.
 */


int dev_set_promiscuity(struct net_device *dev, int inc)
{
	unsigned int old_flags = dev->flags;
	int err;

	err = __dev_set_promiscuity(dev, inc, true);
	if (err < 0)
		return err;
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
18
30.00%
1
12.50%
Jay Vosburgh
18
30.00%
1
12.50%
Vlad Dogaru
9
15.00%
1
12.50%
Jiri Pirko
5
8.33%
2
25.00%
Theodore Y. Ts'o
4
6.67%
1
12.50%
Stephen Hemminger
4
6.67%
1
12.50%
Nicolas Dichtel
2
3.33%
1
12.50%
Total
60
100.00%
8
100.00%


EXPORT_SYMBOL(dev_set_promiscuity);



static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
{
	unsigned int old_flags = dev->flags, old_gflags = dev->gflags;

	ASSERT_RTNL();

	dev->flags |= IFF_ALLMULTI;
	dev->allmulti += inc;
	if (dev->allmulti == 0) {
		/*
                 * Avoid overflow.
                 * If inc causes overflow, untouch allmulti and return error.
                 */
		if (inc < 0)
			dev->flags &= ~IFF_ALLMULTI;
		else {
			dev->allmulti -= inc;
			pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
				dev->name);
			return -EOVERFLOW;
		}
	}
	if (dev->flags ^ old_flags) {
		dev_change_rx_flags(dev, IFF_ALLMULTI);
		dev_set_rx_mode(dev);
		if (notify)
			__dev_notify_flags(dev, old_flags,
					   dev->gflags ^ old_gflags);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
74
55.22%
1
33.33%
Jiri Pirko
32
23.88%
1
33.33%
Nicolas Dichtel
28
20.90%
1
33.33%
Total
134
100.00%
3
100.00%

/**
 *      dev_set_allmulti        - update allmulti count on a device
 *      @dev: device
 *      @inc: modifier
 *
 *      Add or remove reception of all multicast frames to a device. While the
 *      count in the device remains above zero the interface remains listening
 *      to all interfaces. Once it hits zero the device reverts back to normal
 *      filtering operation. A negative @inc value is used to drop the counter
 *      when releasing a resource needing all multicasts.
 *      Return 0 if successful or a negative errno code on error.
 */



int dev_set_allmulti(struct net_device *dev, int inc)
{
	return __dev_set_allmulti(dev, inc, true);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicolas Dichtel
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%


EXPORT_SYMBOL(dev_set_allmulti);

/*
 *      Upload unicast and multicast address lists to device and
 *      configure RX filtering. When the device doesn't support unicast
 *      filtering it is put in promiscuous mode while unicast addresses
 *      are present.
 */


void __dev_set_rx_mode(struct net_device *dev)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
		return;

	if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
		/* Unicast addresses changes may only happen under the rtnl,
                 * therefore calling __dev_set_promiscuity here is safe.
                 */
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
			__dev_set_promiscuity(dev, 1, false);
			dev->uc_promisc = true;
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
			__dev_set_promiscuity(dev, -1, false);
			dev->uc_promisc = false;
		}
	}

	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
75
58.14%
1
9.09%
Linus Torvalds (pre-git)
16
12.40%
4
36.36%
Jeff Garzik
15
11.63%
1
9.09%
Arnaldo Carvalho de Melo
8
6.20%
1
9.09%
Matt Domsch
8
6.20%
1
9.09%
Nicolas Dichtel
4
3.10%
1
9.09%
Roland Dreier
2
1.55%
1
9.09%
John Dykstra
1
0.78%
1
9.09%
Total
129
100.00%
11
100.00%



void dev_set_rx_mode(struct net_device *dev)
{
	netif_addr_lock_bh(dev);
	__dev_set_rx_mode(dev);
	netif_addr_unlock_bh(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
18
72.00%
1
50.00%
Jeff Garzik
7
28.00%
1
50.00%
Total
25
100.00%
2
100.00%

/**
 *      dev_get_flags - get flags reported to userspace
 *      @dev: device
 *
 *      Get the combination of flag bits exported through APIs to userspace.
 */


unsigned int dev_get_flags(const struct net_device *dev)
{
	unsigned int flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

	if (netif_running(dev)) {
		if (netif_oper_up(dev))
			flags |= IFF_RUNNING;
		if (netif_carrier_ok(dev))
			flags |= IFF_LOWER_UP;
		if (netif_dormant(dev))
			flags |= IFF_DORMANT;
	}

	return flags;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
65
69.15%
1
20.00%
Jeff Garzik
17
18.09%
1
20.00%
Linus Torvalds (pre-git)
9
9.57%
2
40.00%
Jarek Poplawski
3
3.19%
1
20.00%
Total
94
100.00%
5
100.00%


EXPORT_SYMBOL(dev_get_flags);



int __dev_change_flags(struct net_device *dev, unsigned int flags)
{
	unsigned int old_flags = dev->flags;
	int ret;

	ASSERT_RTNL();

	/*
         *      Set the flags on our device.
         */

	dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
			       IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
			       IFF_AUTOMEDIA)) |
		     (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
				    IFF_ALLMULTI));

	/*
         *      Load in the correct multicast list now the flags have changed.
         */

	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);

	dev_set_rx_mode(dev);

	/*
         *      Have we downed the interface. We handle IFF_UP ourselves
         *      according to user attempts to set it, rather than blindly
         *      setting it.
         */

	ret = 0;
	if ((old_flags ^ flags) & IFF_UP)
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
		int inc = (flags & IFF_PROMISC) ? 1 : -1;
		unsigned int old_flags = dev->flags;

		dev->gflags ^= IFF_PROMISC;

		if (__dev_set_promiscuity(dev, inc, false) >= 0)
			if (dev->flags != old_flags)
				dev_set_rx_mode(dev);
	}

	/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
         * is important. Some (broken) drivers set IFF_PROMISC, when
         * IFF_ALLMULTI is requested not asking us and not reporting.
         */
	if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

		dev->gflags ^= IFF_ALLMULTI;
		__dev_set_allmulti(dev, inc, false);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
156
65.27%
1
5.88%
Linus Torvalds (pre-git)
43
17.99%
10
58.82%
Nicolas Dichtel
31
12.97%
1
5.88%
Arnaldo Carvalho de Melo
3
1.26%
1
5.88%
Roland Dreier
2
0.84%
1
5.88%
Richard Cochran
2
0.84%
1
5.88%
Tobin C Harding
1
0.42%
1
5.88%
Stephen Hemminger
1
0.42%
1
5.88%
Total
239
100.00%
17
100.00%



void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
			unsigned int gchanges)
{
	unsigned int changes = dev->flags ^ old_flags;

	if (gchanges)
		rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);

	if (changes & IFF_UP) {
		if (dev->flags & IFF_UP)
			call_netdevice_notifiers(NETDEV_UP, dev);
		else
			call_netdevice_notifiers(NETDEV_DOWN, dev);
	}

	if (dev->flags & IFF_UP &&
	    (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
		struct netdev_notifier_change_info change_info;

		change_info.flags_changed = changes;
		call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
					      &change_info.info);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
52
42.98%
1
11.11%
Linus Torvalds (pre-git)
28
23.14%
4
44.44%
Jiri Pirko
18
14.88%
1
11.11%
Nicolas Dichtel
17
14.05%
1
11.11%
Eric W. Biedermann
4
3.31%
1
11.11%
Alexei Starovoitov
2
1.65%
1
11.11%
Total
121
100.00%
9
100.00%

/**
 *      dev_change_flags - change device settings
 *      @dev: device
 *      @flags: device state flags
 *
 *      Change settings on device based state flags. The flags are
 *      in the userspace exported format.
 */


int dev_change_flags(struct net_device *dev, unsigned int flags)
{
	int ret;
	unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;

	ret = __dev_change_flags(dev, flags);
	if (ret < 0)
		return ret;

	changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
	__dev_notify_flags(dev, old_flags, changes);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
47
58.02%
1
12.50%
Nicolas Dichtel
18
22.22%
2
25.00%
Linus Torvalds (pre-git)
11
13.58%
3
37.50%
Jeff Garzik
4
4.94%
1
12.50%
Eric W. Biedermann
1
1.23%
1
12.50%
Total
81
100.00%
8
100.00%


EXPORT_SYMBOL(dev_change_flags);



static int __dev_set_mtu(struct net_device *dev, int new_mtu)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_change_mtu)
		return ops->ndo_change_mtu(dev, new_mtu);

	dev->mtu = new_mtu;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Veaceslav Falico
28
57.14%
1
33.33%
Américo Wang
20
40.82%
1
33.33%
Jeff Garzik
1
2.04%
1
33.33%
Total
49
100.00%
3
100.00%

/**
 *      dev_set_mtu - Change maximum transfer unit
 *      @dev: device
 *      @new_mtu: new transfer unit
 *
 *      Change the maximum transfer size of the network device.
 */


int dev_set_mtu(struct net_device *dev, int new_mtu)
{
	int err, orig_mtu;

	if (new_mtu == dev->mtu)
		return 0;

	/* MTU must be positive, and in range */
	if (new_mtu < 0 || new_mtu < dev->min_mtu) {
		net_err_ratelimited("%s: Invalid MTU %d requested, hw min %d\n",
				    dev->name, new_mtu, dev->min_mtu);
		return -EINVAL;
	}

	if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) {
		net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n",
				    dev->name, new_mtu, dev->max_mtu);
		return -EINVAL;
	}

	if (!netif_device_present(dev))
		return -ENODEV;

	err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
	err = notifier_to_errno(err);
	if (err)
		return err;

	orig_mtu = dev->mtu;
	err = __dev_set_mtu(dev, new_mtu);

	if (!err) {
		err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
		err = notifier_to_errno(err);
		if (err) {
			/* setting mtu back and notifying everyone again,
                         * so that they have a chance to revert changes.
                         */
			__dev_set_mtu(dev, orig_mtu);
			call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
		}
	}
	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jarod Wilson
58
29.74%
1
14.29%
Veaceslav Falico
56
28.72%
2
28.57%
Américo Wang
48
24.62%
1
14.29%
Linus Torvalds
24
12.31%
1
14.29%
Jeff Garzik
8
4.10%
1
14.29%
Jakub Kiciński
1
0.51%
1
14.29%
Total
195
100.00%
7
100.00%


EXPORT_SYMBOL(dev_set_mtu);

/**
 *      dev_set_group - Change group this device belongs to
 *      @dev: device
 *      @new_group: group this device should belong to
 */


void dev_set_group(struct net_device *dev, int new_group)
{
	dev->group = new_group;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
17
89.47%
1
50.00%
Linus Torvalds
2
10.53%
1
50.00%
Total
19
100.00%
2
100.00%


EXPORT_SYMBOL(dev_set_group);

/**
 *      dev_set_mac_address - Change Media Access Control Address
 *      @dev: device
 *      @sa: new address
 *
 *      Change the hardware (MAC) address of the device
 */


int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
	const struct net_device_ops *ops = dev->netdev_ops;
	int err;

	if (!ops->ndo_set_mac_address)
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
	err = ops->ndo_set_mac_address(dev, sa);
	if (err)
		return err;
	dev->addr_assign_type = NET_ADDR_SET;
	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	add_device_randomness(dev->dev_addr, dev->addr_len);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
74
67.27%
1
11.11%
Linus Torvalds (pre-git)
24
21.82%
5
55.56%
Eric W. Biedermann
7
6.36%
2
22.22%
Linus Torvalds
5
4.55%
1
11.11%
Total
110
100.00%
9
100.00%


EXPORT_SYMBOL(dev_set_mac_address);

/**
 *      dev_change_carrier - Change device carrier
 *      @dev: device
 *      @new_carrier: new value
 *
 *      Change device carrier
 */


int dev_change_carrier(struct net_device *dev, bool new_carrier)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!ops->ndo_change_carrier)
		return -EOPNOTSUPP;
	if (!netif_device_present(dev))
		return -ENODEV;
	return ops->ndo_change_carrier(dev, new_carrier);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Américo Wang
41
73.21%
1
50.00%
Linus Torvalds (pre-git)
15
26.79%
1
50.00%
Total
56
100.00%
2
100.00%


EXPORT_SYMBOL(dev_change_carrier);

/**
 *      dev_get_phys_port_id - Get device physical port ID
 *      @dev: device
 *      @ppid: port ID
 *
 *      Get device physical port ID
 */


int dev_get_phys_port_id(struct net_device *dev,
			 struct netdev_phys_item_id *ppid)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!ops->ndo_get_phys_port_id)
		return -EOPNOTSUPP;
	return ops->ndo_get_phys_port_id(dev, ppid);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Pirko
46
100.00%
2
100.00%
Total
46
100.00%
2
100.00%


EXPORT_SYMBOL(dev_get_phys_port_id);

/**
 *      dev_get_phys_port_name - Get device physical port name
 *      @dev: device
 *      @name: port name
 *      @len: limit of bytes to copy to name
 *
 *      Get device physical port name
 */


int dev_get_phys_port_name(struct net_device *dev,
			   char *name, size_t len)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!ops->ndo_get_phys_port_name)
		return -EOPNOTSUPP;
	return ops->ndo_get_phys_port_name(dev, name, len);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Ahern
50
100.00%
1
100.00%
Total
50
100.00%
1
100.00%


EXPORT_SYMBOL(dev_get_phys_port_name);

/**
 *      dev_change_proto_down - update protocol port state information
 *      @dev: device
 *      @proto_down: new value
 *
 *      This info can be used by switch drivers to set the phys state of the
 *      port.
 */


int dev_change_proto_down(struct net_device *dev, bool proto_down)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (!ops->ndo_change_proto_down)
		return -EOPNOTSUPP;
	if (!netif_device_present(dev))
		return -ENODEV;
	return ops->ndo_change_proto_down(dev, proto_down);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Anuradha Karuppiah
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%


EXPORT_SYMBOL(dev_change_proto_down);

/**
 *      dev_change_xdp_fd - set or clear a bpf program for a device rx path
 *      @dev: device
 *      @fd: new program fd or negative value to clear
 *      @flags: xdp-related flags
 *
 *      Set or clear a bpf program for a device
 */


int dev_change_xdp_fd(struct net_device *dev, int fd, u32 flags)
{
	const struct net_device_ops *ops = dev->netdev_ops;
	struct bpf_prog *prog = NULL;
	struct netdev_xdp xdp;
	int err;

	ASSERT_RTNL();

	if (!ops->ndo_xdp)
		return -EOPNOTSUPP;
	if (fd >= 0) {
		if (flags & XDP_FLAGS_UPDATE_IF_NOEXIST) {
			memset(&xdp, 0, sizeof(xdp));
			xdp.command = XDP_QUERY_PROG;

			err = ops->ndo_xdp(dev, &xdp);
			if (err < 0)
				return err;
			if (xdp.prog_attached)
				return -EBUSY;
		}

		prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
		if (IS_ERR(prog))
			return PTR_ERR(prog);
	}

	memset(&xdp, 0, sizeof(xdp));
	xdp.command = XDP_SETUP_PROG;
	xdp.prog = prog;

	err = ops->ndo_xdp(dev, &xdp);
	if (err < 0 && prog)
		bpf_prog_put(prog);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Brenden Blanco
118
60.51%
1
50.00%
Daniel Borkmann
77
39.49%
1
50.00%
Total
195
100.00%
2
100.00%

/**
 *      dev_new_index   -       allocate an ifindex
 *      @net: the applicable net namespace
 *
 *      Returns a suitable unique value for a new device interface
 *      number.  The caller must hold the rtnl semaphore or the
 *      dev_base_lock to be sure it remains unique.
 */


static int dev_new_index(struct net *net)
{
	int ifindex = net->ifindex;

	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
		if (!__dev_get_by_index(net, ifindex))
			return net->ifindex = ifindex;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
37
69.81%
3
42.86%
Pavel Emelyanov
8
15.09%
1
14.29%
Eric W. Biedermann
6
11.32%
1
14.29%
Christoph Hellwig
1
1.89%
1
14.29%
Arnaldo Carvalho de Melo
1
1.89%
1
14.29%
Total
53
100.00%
7
100.00%

/* Delayed registration/unregisteration */
static LIST_HEAD(net_todo_list);

DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);



static void net_set_todo(struct net_device *dev)
{
	list_add_tail(&dev->todo_list, &net_todo_list);
	dev_net(dev)->dev_unreg_count++;
}

Contributors
Person
Tokens
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CommitProp
Stephen Hemminger
22
73.33%
1
50.00%
Eric W. Biedermann
8
26.67%
1
50.00%
Total
30
100.00%
2
100.00%



static void rollback_registered_many(struct list_head *head)
{
	struct net_device *dev, *tmp;
	LIST_HEAD(close_head);

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
		/* Some devices call without registering
                 * for initialization unwind. Remove those
                 * devices and proceed with the remaining.
                 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never was registered\n",
				 dev->name, dev);

			WARN_ON(1);
			list_del(&dev->unreg_list);
			continue;
		}
		dev->dismantle = true;
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
	}

	/* If device is running, close it first. */
	list_for_each_entry(dev, head, unreg_list)
		list_add_tail(&dev->close_list, &close_head);
	dev_close_many(&close_head, true);

	list_for_each_entry(dev, head, unreg_list) {
		/* And unlink it from device chain. */
		unlist_netdevice(dev);

		dev->reg_state = NETREG_UNREGISTERING;
	}
	flush_all_backlogs();

	synchronize_net();

	list_for_each_entry(dev, head, unreg_list) {
		struct sk_buff *skb = NULL;

		/* Shutdown queueing discipline. */
		dev_shutdown(dev);


		/* Notify protocols, that we are about to destroy
                 * this device. They should clean all the things.
                 */
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U,
						     GFP_KERNEL);

		/*
                 *      Flush the unicast and multicast chains
                 */
		dev_uc_flush(dev);
		dev_mc_flush(dev);

		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);

		if (skb)
			rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);

		/* Notifier chain MUST detach us all upper devices. */
		WARN_ON(netdev_has_any_upper_dev(dev));
		WARN_ON(netdev_has_any_lower_dev(dev));

		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
#ifdef CONFIG_XPS
		/* Remove XPS queueing entries */
		netif_reset_xps_queues_gt(dev, 0);
#endif
	}

	synchronize_net();

	list_for_each_entry(dev, head, unreg_list)
		dev_put(dev);
}

Contributors
Person
Tokens
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CommitProp
Daniel Lezcano
111
36.75%
1
4.00%
Mahesh Bandewar
37
12.25%
1
4.00%
Eric Dumazet
36
11.92%
3
12.00%
Eric W. Biedermann
34
11.26%
3
12.00%
Krishna Kumar
16
5.30%
1
4.00%
Octavian Purdila
14
4.64%
2
8.00%
Alexander Duyck
13
4.30%
1
4.00%
Jiri Pirko
10
3.31%
4
16.00%
Roopa Prabhu
10
3.31%
1
4.00%
David Ahern
8
2.65%
1
4.00%
Stephen Hemminger
6
1.99%
1
4.00%
David S. Miller
2
0.66%
1
4.00%
Julian Anastasov
1
0.33%
1
4.00%
Joe Perches
1
0.33%
1
4.00%
Paolo Abeni
1
0.33%
1
4.00%
Ilpo Järvinen
1
0.33%
1
4.00%
Tobin C Harding
1
0.33%
1
4.00%
Total
302
100.00%
25
100.00%



static void rollback_registered(struct net_device *dev)
{
	LIST_HEAD(single);

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
	list_del(&single);
}

Contributors
Person
Tokens
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Eric Dumazet
39
100.00%
2
100.00%
Total
39
100.00%
2
100.00%



static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
	struct net_device *upper, netdev_features_t features)
{
	netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
	netdev_features_t feature;
	int feature_bit;

	for_each_netdev_feature(&upper_disables, feature_bit) {
		feature = __NETIF_F_BIT(feature_bit);
		if (!(upper->wanted_features & feature)
		    && (features & feature)) {
			netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
				   &feature, upper->name);
			features &= ~feature;
		}
	}

	return features;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jarod Wilson
86
100.00%
2
100.00%
Total
86
100.00%
2
100.00%



static void netdev_sync_lower_features(struct net_device *upper,
	struct net_device *lower, netdev_features_t features)
{
	netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
	netdev_features_t feature;
	int feature_bit;

	for_each_netdev_feature(&upper_disables, feature_bit) {
		feature = __NETIF_F_BIT(feature_bit);
		if (!(features & feature) && (lower->features & feature)) {
			netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
				   &feature, lower->name);
			lower->wanted_features &= ~feature;
			netdev_update_features(lower);

			if (unlikely(lower->features & feature))
				netdev_WARN(upper, "failed to disable %pNF on %s!\n",
					    &feature, lower->name);
		}
	}
}

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Jarod Wilson
115
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2
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115
100.00%
2
100.00%



static netdev_features_t netdev_fix_features(struct net_device *dev,
	netdev_features_t features)
{
	/* Fix illegal checksum combinations */
	if ((features & NETIF_F_HW_CSUM) &&
	    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
		netdev_warn(dev, "mixed HW and IP checksum settings.\n");
		features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

	/* TSO requires that SG is present as well. */
	if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
		netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
		features &= ~NETIF_F_ALL_TSO;
	}

	if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
					!(features & NETIF_F_IP_CSUM)) {
		netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
		features &= ~NETIF_F_TSO;
		features &= ~NETIF_F_TSO_ECN;
	}

	if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
					 !(features & NETIF_F_IPV6_CSUM)) {
		netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
		features &= ~NETIF_F_TSO6;
	}

	/* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
	if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
		features &= ~NETIF_F_TSO_MANGLEID;

	/* TSO ECN requires that TSO is present as well. */
	if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
		features &= ~NETIF_F_TSO_ECN;

	/* Software GSO depends on SG. */
	if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
		netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
		features &= ~NETIF_F_GSO;
	}

	/* UFO needs SG and checksumming */
	if (features & NETIF_F_UFO) {
		/* maybe split UFO into V4 and V6? */
		if (!(features & NETIF_F_HW_CSUM) &&
		    ((features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) !=
		     (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))) {
			netdev_dbg(dev,
				"Dropping NETIF_F_UFO since no checksum offload features.\n");
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
			netdev_dbg(dev,
				"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
			features &= ~NETIF_F_UFO;
		}
	}

	/* GSO partial features require GSO partial be set */
	if ((features & dev->gso_partial_features) &&
	    !(features & NETIF_F_GSO_PARTIAL)) {
		netdev_dbg(dev,
			   "Dropping partially supported GSO features since no GSO partial.\n");
		features &= ~dev->gso_partial_features;
	}

	return features;
}

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Herbert Xu
103
30.65%
1
7.69%
Michał Mirosław
102
30.36%
7
53.85%
Pravin B Shelar
56
16.67%
1
7.69%
Alexander Duyck
55
16.37%
2
15.38%
Ben Hutchings
16
4.76%
1
7.69%
Tom Herbert
4
1.19%
1
7.69%
Total
336
100.00%
13
100.00%



int __netdev_update_features(struct net_device *dev)
{
	struct net_device *upper, *lower;
	netdev_features_t features;
	struct list_head *iter;
	int err = -1;

	ASSERT_RTNL();

	features = netdev_get_wanted_features(dev);

	if (dev->netdev_ops->ndo_fix_features)
		features = dev->netdev_ops->ndo_fix_features(dev, features);

	/* driver might be less strict about feature dependencies */
	features = netdev_fix_features(dev, features);

	/* some features can't be enabled if they're off an an upper device */
	netdev_for_each_upper_dev_rcu(dev, upper, iter)
		features = netdev_sync_upper_features(dev, upper, features);

	if (dev->features == features)
		goto sync_lower;

	netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
		&dev->features, &features);

	if (dev->netdev_ops->ndo_set_features)
		err = dev->netdev_ops->ndo_set_features(dev, features);
	else
		err = 0;

	if (unlikely(err < 0)) {
		netdev_err(dev,
			"set_features() failed (%d); wanted %pNF, left %pNF\n",
			err, &features, &dev->features);
		/* return non-0 since some features might have changed and
                 * it's better to fire a spurious notification than miss it
                 */
		return -1;
	}

sync_lower:
	/* some features must be disabled on lower devices when disabled
         * on an upper device (think: bonding master or bridge)
         */
	netdev_for_each_lower_dev(dev, lower, iter)
		netdev_sync_lower_features(dev, lower, features);

	if (!err)
		dev->features = features;

	return err < 0 ? 0 : 1;
}

Contributors
Person
Tokens
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CommitProp
Michał Mirosław
145
66.51%
4
44.44%
Jarod Wilson
64
29.36%
2
22.22%
Nikolay Aleksandrov
8
3.67%
2
22.22%
Michael S. Tsirkin
1
0.46%
1
11.11%
Total
218
100.00%
9
100.00%

/**
 *      netdev_update_features - recalculate device features
 *      @dev: the device to check
 *
 *      Recalculate dev->features set and send notifications if it
 *      has changed. Should be called after driver or hardware dependent
 *      conditions might have changed that influence the features.
 */


void netdev_update_features(struct net_device *dev)
{
	if (__netdev_update_features(dev))
		netdev_features_change(dev);
}
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Michał Mirosław
22
100.00%
2
100.00%
Total
22
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_update_features);

/**
 *      netdev_change_features - recalculate device features
 *      @dev: the device to check
 *
 *      Recalculate dev->features set and send notifications even
 *      if they have not changed. Should be called instead of
 *      netdev_update_features() if also dev->vlan_features might
 *      have changed to allow the changes to be propagated to stacked
 *      VLAN devices.
 */


void netdev_change_features(struct net_device *dev)
{
	__netdev_update_features(dev);
	netdev_features_change(dev);
}
Contributors
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CommitProp
Michał Mirosław
20
100.00%
1
100.00%
Total
20
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_change_features);

/**
 *      netif_stacked_transfer_operstate -      transfer operstate
 *      @rootdev: the root or lower level device to transfer state from
 *      @dev: the device to transfer operstate to
 *
 *      Transfer operational state from root to device. This is normally
 *      called when a stacking relationship exists between the root
 *      device and the device(a leaf device).
 */


void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev)
{
	if (rootdev->operstate == IF_OPER_DORMANT)
		netif_dormant_on(dev);
	else
		netif_dormant_off(dev);

	if (netif_carrier_ok(rootdev)) {
		if (!netif_carrier_ok(dev))
			netif_carrier_on(dev);
	} else {
		if (netif_carrier_ok(dev))
			netif_carrier_off(dev);
	}
}
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Patrick Mullaney
72
100.00%
1
100.00%
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72
100.00%
1
100.00%


EXPORT_SYMBOL(netif_stacked_transfer_operstate);

#ifdef CONFIG_SYSFS


static int netif_alloc_rx_queues(struct net_device *dev)
{
	unsigned int i, count = dev->num_rx_queues;
	struct netdev_rx_queue *rx;
	size_t sz = count * sizeof(*rx);

	BUG_ON(count < 1);

	rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
	if (!rx) {
		rx = vzalloc(sz);
		if (!rx)
			return -ENOMEM;
	}
	dev->_rx = rx;

	for (i = 0; i < count; i++)
		rx[i].dev = dev;
	return 0;
}
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Eric Dumazet
71
63.96%
1
25.00%
Pankaj Gupta
31
27.93%
1
25.00%
Tom Herbert
9
8.11%
2
50.00%
Total
111
100.00%
4
100.00%

#endif



static void netdev_init_one_queue(struct net_device *dev,
				  struct netdev_queue *queue, void *_unused)
{
	/* Initialize queue lock */
	spin_lock_init(&queue->_xmit_lock);
	netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
	queue->xmit_lock_owner = -1;
	netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
	queue->dev = dev;
#ifdef CONFIG_BQL
	dql_init(&queue->dql, HZ);
#endif
}

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Changli Gao
61
80.26%
2
66.67%
Tom Herbert
15
19.74%
1
33.33%
Total
76
100.00%
3
100.00%



static void netif_free_tx_queues(struct net_device *dev)
{
	kvfree(dev->_tx);
}

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Eric Dumazet
17
94.44%
1
50.00%
Américo Wang
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%



static int netif_alloc_netdev_queues(struct net_device *dev)
{
	unsigned int count = dev->num_tx_queues;
	struct netdev_queue *tx;
	size_t sz = count * sizeof(*tx);

	if (count < 1 || count > 0xffff)
		return -EINVAL;

	tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
	if (!tx) {
		tx = vzalloc(sz);
		if (!tx)
			return -ENOMEM;
	}
	dev->_tx = tx;

	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
	spin_lock_init(&dev->tx_global_lock);

	return 0;
}

Contributors
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Tom Herbert
58
52.25%
1
20.00%
Eric Dumazet
42
37.84%
2
40.00%
Patrick Mullaney
8
7.21%
1
20.00%
Changli Gao
3
2.70%
1
20.00%
Total
111
100.00%
5
100.00%



void netif_tx_stop_all_queues(struct net_device *dev)
{
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);

		netif_tx_stop_queue(txq);
	}
}
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Denys Vlasenko
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%


EXPORT_SYMBOL(netif_tx_stop_all_queues);

/**
 *      register_netdevice      - register a network device
 *      @dev: device to register
 *
 *      Take a completed network device structure and add it to the kernel
 *      interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
 *      chain. 0 is returned on success. A negative errno code is returned
 *      on a failure to set up the device, or if the name is a duplicate.
 *
 *      Callers must hold the rtnl semaphore. You may want
 *      register_netdev() instead of this.
 *
 *      BUGS:
 *      The locking appears insufficient to guarantee two parallel registers
 *      will not get the same name.
 */



int register_netdevice(struct net_device *dev)
{
	int ret;
	struct net *net = dev_net(dev);

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

	might_sleep();

	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
	BUG_ON(!net);

	spin_lock_init(&dev->addr_list_lock);
	netdev_set_addr_lockdep_class(dev);

	ret = dev_get_valid_name(net, dev, dev->name);
	if (ret < 0)
		goto out;

	/* Init, if this function is available */
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
		if (ret) {
			if (ret > 0)
				ret = -EIO;
			goto out;
		}
	}

	if (((dev->hw_features | dev->features) &
	     NETIF_F_HW_VLAN_CTAG_FILTER) &&
	    (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
	     !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
		netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
		ret = -EINVAL;
		goto err_uninit;
	}

	ret = -EBUSY;
	if (!dev->ifindex)
		dev->ifindex = dev_new_index(net);
	else if (__dev_get_by_index(net, dev->ifindex))
		goto err_uninit;

	/* Transfer changeable features to wanted_features and enable
         * software offloads (GSO and GRO).
         */
	dev->hw_features |= NETIF_F_SOFT_FEATURES;
	dev->features |= NETIF_F_SOFT_FEATURES;
	dev->wanted_features = dev->features & dev->hw_features;

	if (!(dev->flags & IFF_LOOPBACK))
		dev->hw_features |= NETIF_F_NOCACHE_COPY;

	/* If IPv4 TCP segmentation offload is supported we should also
         * allow the device to enable segmenting the frame with the option
         * of ignoring a static IP ID value.  This doesn't enable the
         * feature itself but allows the user to enable it later.
         */
	if (dev->hw_features & NETIF_F_TSO)
		dev->hw_features |= NETIF_F_TSO_MANGLEID;
	if (dev->vlan_features & NETIF_F_TSO)
		dev->vlan_features |= NETIF_F_TSO_MANGLEID;
	if (dev->mpls_features & NETIF_F_TSO)
		dev->mpls_features |= NETIF_F_TSO_MANGLEID;
	if (dev->hw_enc_features & NETIF_F_TSO)
		dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;

	/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
         */
	dev->vlan_features |= NETIF_F_HIGHDMA;

	/* Make NETIF_F_SG inheritable to tunnel devices.
         */
	dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;

	/* Make NETIF_F_SG inheritable to MPLS.
         */
	dev->mpls_features |= NETIF_F_SG;

	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

	ret = netdev_register_kobject(dev);
	if (ret)
		goto err_uninit;
	dev->reg_state = NETREG_REGISTERED;

	__netdev_update_features(dev);

	/*
         *      Default initial state at registry is that the
         *      device is present.
         */

	set_bit(__LINK_STATE_PRESENT, &dev->state);

	linkwatch_init_dev(dev);

	dev_init_scheduler(dev);
	dev_hold(dev);
	list_netdevice(dev);
	add_device_randomness(dev->dev_addr, dev->addr_len);

	/* If the device has permanent device address, driver should
         * set dev_addr and also addr_assign_type should be set to
         * NET_ADDR_PERM (default value).
         */
	if (dev->addr_assign_type == NET_ADDR_PERM)
		memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);

	/* Notify protocols, that a new device appeared. */
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
	ret = notifier_to_errno(ret);
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
	/*
         *      Prevent userspace races by waiting until the network
         *      device is fully setup before sending notifications.
         */
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);

out:
	return ret;

err_uninit:
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
	goto out;
}
Contributors
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Michał Mirosław
87
16.26%
8
16.00%
David S. Miller
67
12.52%
3
6.00%
Alexander Duyck
59
11.03%
3
6.00%
Linus Torvalds (pre-git)
51
9.53%
7
14.00%
Herbert Xu
31
5.79%
2
4.00%
Stephen Hemminger
30
5.61%
2
4.00%
Pavel Emelyanov
28
5.23%
2
4.00%
Jiri Pirko
24
4.49%
1
2.00%
Johannes Berg
23
4.30%
1
2.00%
Andrew Morton
22
4.11%
1
2.00%
Weiping Pan (潘卫平)
20
3.74%
1
2.00%
Eric W. Biedermann
17
3.18%
4
8.00%
Patrick McHardy
14
2.62%
2
4.00%
Theodore Y. Ts'o
11
2.06%
1
2.00%
Daniel Lezcano
9
1.68%
1
2.00%
Pravin B Shelar
7
1.31%
1
2.00%
Simon Horman
7
1.31%
1
2.00%
Tom Herbert
6
1.12%
1
2.00%
Ben Hutchings
5
0.93%
1
2.00%
Arnaldo Carvalho de Melo
5
0.93%
1
2.00%
Brandon Philips
5
0.93%
1
2.00%
Alexei Starovoitov
2
0.37%
1
2.00%
Gao Feng
2
0.37%
1
2.00%
Adrian Bunk
1
0.19%
1
2.00%
Eric Dumazet
1
0.19%
1
2.00%
Ananda Raju
1
0.19%
1
2.00%
Total
535
100.00%
50
100.00%


EXPORT_SYMBOL(register_netdevice);

/**
 *      init_dummy_netdev       - init a dummy network device for NAPI
 *      @dev: device to init
 *
 *      This takes a network device structure and initialize the minimum
 *      amount of fields so it can be used to schedule NAPI polls without
 *      registering a full blown interface. This is to be used by drivers
 *      that need to tie several hardware interfaces to a single NAPI
 *      poll scheduler due to HW limitations.
 */


int init_dummy_netdev(struct net_device *dev)
{
	/* Clear everything. Note we don't initialize spinlocks
         * are they aren't supposed to be taken by any of the
         * NAPI code and this dummy netdev is supposed to be
         * only ever used for NAPI polls
         */
	memset(dev, 0, sizeof(struct net_device));

	/* make sure we BUG if trying to hit standard
         * register/unregister code path
         */
	dev->reg_state = NETREG_DUMMY;

	/* NAPI wants this */
	INIT_LIST_HEAD(&dev->napi_list);

	/* a dummy interface is started by default */
	set_bit(__LINK_STATE_PRESENT, &dev->state);
	set_bit(__LINK_STATE_START, &dev->state);

	/* Note : We dont allocate pcpu_refcnt for dummy devices,
         * because users of this 'device' dont need to change
         * its refcount.
         */

	return 0;
}
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Benjamin Herrenschmidt
64
98.46%
1
50.00%
Eric Dumazet
1
1.54%
1
50.00%
Total
65
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(init_dummy_netdev);


/**
 *      register_netdev - register a network device
 *      @dev: device to register
 *
 *      Take a completed network device structure and add it to the kernel
 *      interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
 *      chain. 0 is returned on success. A negative errno code is returned
 *      on a failure to set up the device, or if the name is a duplicate.
 *
 *      This is a wrapper around register_netdevice that takes the rtnl semaphore
 *      and expands the device name if you passed a format string to
 *      alloc_netdev.
 */


int register_netdev(struct net_device *dev)
{
	int err;

	rtnl_lock();
	err = register_netdevice(dev);
	rtnl_unlock();
	return err;
}
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Christoph Hellwig
29
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1
100.00%
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29
100.00%
1
100.00%


EXPORT_SYMBOL(register_netdev);



int netdev_refcnt_read(const struct net_device *dev)
{
	int i, refcnt = 0;

	for_each_possible_cpu(i)
		refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
	return refcnt;
}
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Eric Dumazet
37
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37
100.00%
1
100.00%


EXPORT_SYMBOL(netdev_refcnt_read);

/**
 * netdev_wait_allrefs - wait until all references are gone.
 * @dev: target net_device
 *
 * This is called when unregistering network devices.
 *
 * Any protocol or device that holds a reference should register
 * for netdevice notification, and cleanup and put back the
 * reference if they receive an UNREGISTER event.
 * We can get stuck here if buggy protocols don't correctly
 * call dev_put.
 */


static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;
	int refcnt;

	linkwatch_forget_dev(dev);

	rebroadcast_time = warning_time = jiffies;
	refcnt = netdev_refcnt_read(dev);

	while (refcnt != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
			rtnl_lock();

			/* Rebroadcast unregister notification */
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

			__rtnl_unlock();
			rcu_barrier();
			rtnl_lock();

			call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
			if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
				     &dev->state)) {
				/* We must not have linkwatch events
                                 * pending on unregister. If this
                                 * happens, we simply run the queue
                                 * unscheduled, resulting in a noop
                                 * for this device.
                                 */
				linkwatch_run_queue();
			}

			__rtnl_unlock();

			rebroadcast_time = jiffies;
		}

		msleep(250);

		refcnt = netdev_refcnt_read(dev);

		if (time_after(jiffies, warning_time + 10 * HZ)) {
			pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
				 dev->name, refcnt);
			warning_time = jiffies;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
110
70.97%
1
11.11%
Eric Dumazet
38
24.52%
4
44.44%
Stephen Hemminger
2
1.29%
1
11.11%
Nishanth Aravamudan
2
1.29%
1
11.11%
Joe Perches
2
1.29%
1
11.11%
Pavel Emelyanov
1
0.65%
1
11.11%
Total
155
100.00%
9
100.00%

/* The sequence is:
 *
 *      rtnl_lock();
 *      ...
 *      register_netdevice(x1);
 *      register_netdevice(x2);
 *      ...
 *      unregister_netdevice(y1);
 *      unregister_netdevice(y2);
 *      ...
 *      rtnl_unlock();
 *      free_netdev(y1);
 *      free_netdev(y2);
 *
 * We are invoked by rtnl_unlock().
 * This allows us to deal with problems:
 * 1) We can delete sysfs objects which invoke hotplug
 *    without deadlocking with linkwatch via keventd.
 * 2) Since we run with the RTNL semaphore not held, we can sleep
 *    safely in order to wait for the netdev refcnt to drop to zero.
 *
 * We must not return until all unregister events added during
 * the interval the lock was held have been completed.
 */


void netdev_run_todo(void)
{
	struct list_head list;

	/* Snapshot list, allow later requests */
	list_replace_init(&net_todo_list, &list);

	__rtnl_unlock();


	/* Wait for rcu callbacks to finish before next phase */
	if (!list_empty(&list))
		rcu_barrier();

	while (!list_empty(&list)) {
		struct net_device *dev
			= list_first_entry(&list, struct net_device, todo_list);
		list_del(&dev->todo_list);

		rtnl_lock();
		call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
		__rtnl_unlock();

		if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
			pr_err("network todo '%s' but state %d\n",
			       dev->name, dev->reg_state);
			dump_stack();
			continue;
		}

		dev->reg_state = NETREG_UNREGISTERED;

		netdev_wait_allrefs(dev);

		/* paranoia */
		BUG_ON(netdev_refcnt_read(dev));
		BUG_ON(!list_empty(&dev->ptype_all));
		BUG_ON(!list_empty(&dev->ptype_specific));
		WARN_ON(rcu_access_pointer(dev->ip_ptr));
		WARN_ON(rcu_access_pointer(dev->ip6_ptr));
		WARN_ON(dev->dn_ptr);

		if (dev->destructor)
			dev->destructor(dev);

		/* Report a network device has been unregistered */
		rtnl_lock();
		dev_net(dev)->dev_unreg_count--;
		__rtnl_unlock();
		wake_up(&netdev_unregistering_wq);

		/* Free network device */
		kobject_put(&dev->dev.kobj);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
108
46.75%
7
31.82%
David S. Miller
38
16.45%
2
9.09%
Eric W. Biedermann
33
14.29%
2
9.09%
Salam Noureddine
24
10.39%
1
4.55%
Eric Dumazet
21
9.09%
6
27.27%
Ilpo Järvinen
3
1.30%
1
4.55%
Herbert Xu
2
0.87%
1
4.55%
Oleg Nesterov
1
0.43%
1
4.55%
Joe Perches
1
0.43%
1
4.55%
Total
231
100.00%
22
100.00%

/* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
 * all the same fields in the same order as net_device_stats, with only
 * the type differing, but rtnl_link_stats64 may have additional fields
 * at the end for newer counters.
 */


void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
			     const struct net_device_stats *netdev_stats)
{
#if BITS_PER_LONG == 64
	BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
	memcpy(stats64, netdev_stats, sizeof(*stats64));
	/* zero out counters that only exist in rtnl_link_stats64 */
	memset((char *)stats64 + sizeof(*netdev_stats), 0,
	       sizeof(*stats64) - sizeof(*netdev_stats));
#else
	size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
	const unsigned long *src = (const unsigned long *)netdev_stats;
	u64 *dst = (u64 *)stats64;

	BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
	for (i = 0; i < n; i++)
		dst[i] = src[i];
	/* zero out counters that only exist in rtnl_link_stats64 */
	memset((char *)stats64 + n * sizeof(u64), 0,
	       sizeof(*stats64) - n * sizeof(u64));
#endif
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ben Hutchings
124
63.59%
1
50.00%
Jarod Wilson
71
36.41%
1
50.00%
Total
195
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_stats_to_stats64);

/**
 *      dev_get_stats   - get network device statistics
 *      @dev: device to get statistics from
 *      @storage: place to store stats
 *
 *      Get network statistics from device. Return @storage.
 *      The device driver may provide its own method by setting
 *      dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
 *      otherwise the internal statistics structure is used.
 */


struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage)
{
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_get_stats64) {
		memset(storage, 0, sizeof(*storage));
		ops->ndo_get_stats64(dev, storage);
	} else if (ops->ndo_get_stats) {
		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
	} else {
		netdev_stats_to_stats64(storage, &dev->stats);
	}
	storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
	storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
	storage->rx_nohandler += atomic_long_read(&dev->rx_nohandler);
	return storage;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
101
77.69%
4
50.00%
Ben Hutchings
15
11.54%
2
25.00%
Jarod Wilson
12
9.23%
1
12.50%
Rusty Russell
2
1.54%
1
12.50%
Total
130
100.00%
8
100.00%


EXPORT_SYMBOL(dev_get_stats);



struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
{
	struct netdev_queue *queue = dev_ingress_queue(dev);

#ifdef CONFIG_NET_CLS_ACT
	if (queue)
		return queue;
	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
	if (!queue)
		return NULL;
	netdev_init_one_queue(dev, queue, NULL);
	RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
	queue->qdisc_sleeping = &noop_qdisc;
	rcu_assign_pointer(dev->ingress_queue, queue);
#endif
	return queue;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
64
68.82%
2
33.33%
David S. Miller
29
31.18%
4
66.67%
Total
93
100.00%
6
100.00%


static const struct ethtool_ops default_ethtool_ops;



void netdev_set_default_ethtool_ops(struct net_device *dev,
				    const struct ethtool_ops *ops)
{
	if (dev->ethtool_ops == &default_ethtool_ops)
		dev->ethtool_ops = ops;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stanislaw Gruszka
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);



void netdev_freemem(struct net_device *dev)
{
	char *addr = (char *)dev - dev->padded;

	kvfree(addr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
28
96.55%
1
50.00%
Américo Wang
1
3.45%
1
50.00%
Total
29
100.00%
2
100.00%

/**
 * alloc_netdev_mqs - allocate network device
 * @sizeof_priv: size of private data to allocate space for
 * @name: device name format string
 * @name_assign_type: origin of device name
 * @setup: callback to initialize device
 * @txqs: the number of TX subqueues to allocate
 * @rxqs: the number of RX subqueues to allocate
 *
 * Allocates a struct net_device with private data area for driver use
 * and performs basic initialization.  Also allocates subqueue structs
 * for each queue on the device.
 */


struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
		unsigned char name_assign_type,
		void (*setup)(struct net_device *),
		unsigned int txqs, unsigned int rxqs)
{
	struct net_device *dev;
	size_t alloc_size;
	struct net_device *p;

	BUG_ON(strlen(name) >= sizeof(dev->name));

	if (txqs < 1) {
		pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
		return NULL;
	}

#ifdef CONFIG_SYSFS
	if (rxqs < 1) {
		pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
		return NULL;
	}
#endif

	alloc_size = sizeof(struct net_device);
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
	alloc_size += NETDEV_ALIGN - 1;

	p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
	if (!p)
		p = vzalloc(alloc_size);
	if (!p)
		return NULL;

	dev = PTR_ALIGN(p, NETDEV_ALIGN);
	dev->padded = (char *)dev - (char *)p;

	dev->pcpu_refcnt = alloc_percpu(int);
	if (!dev->pcpu_refcnt)
		goto free_dev;

	if (dev_addr_init(dev))
		goto free_pcpu;

	dev_mc_init(dev);
	dev_uc_init(dev);

	dev_net_set(dev, &init_net);

	dev->gso_max_size = GSO_MAX_SIZE;
	dev->gso_max_segs = GSO_MAX_SEGS;

	INIT_LIST_HEAD(&dev->napi_list);
	INIT_LIST_HEAD(&dev->unreg_list);
	INIT_LIST_HEAD(&dev->close_list);
	INIT_LIST_HEAD(&dev->link_watch_list);
	INIT_LIST_HEAD(&dev->adj_list.upper);
	INIT_LIST_HEAD(&dev->adj_list.lower);
	INIT_LIST_HEAD(&dev->ptype_all);
	INIT_LIST_HEAD(&dev->ptype_specific);
#ifdef CONFIG_NET_SCHED
	hash_init(dev->qdisc_hash);
#endif
	dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
	setup(dev);

	if (!dev->tx_queue_len) {
		dev->priv_flags |= IFF_NO_QUEUE;
		dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
	}

	dev->num_tx_queues = txqs;
	dev->real_num_tx_queues = txqs;
	if (netif_alloc_netdev_queues(dev))
		goto free_all;

#ifdef CONFIG_SYSFS
	dev->num_rx_queues = rxqs;
	dev->real_num_rx_queues = rxqs;
	if (netif_alloc_rx_queues(dev))
		goto free_all;
#endif

	strcpy(dev->name, name);
	dev->name_assign_type = name_assign_type;
	dev->group = INIT_NETDEV_GROUP;
	if (!dev->ethtool_ops)
		dev->ethtool_ops = &default_ethtool_ops;

	nf_hook_ingress_init(dev);

	return dev;

free_all:
	free_netdev(dev);
	return NULL;

free_pcpu:
	free_percpu(dev->pcpu_refcnt);
free_dev:
	netdev_freemem(dev);
	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
94
19.18%
1
2.33%
Eric Dumazet
89
18.16%
7
16.28%
David S. Miller
64
13.06%
2
4.65%
Tom Herbert
40
8.16%
2
4.65%
Jiri Pirko
35
7.14%
5
11.63%
Eric W. Biedermann
20
4.08%
3
6.98%
Phil Sutter
20
4.08%
3
6.98%
Veaceslav Falico
20
4.08%
1
2.33%
Stephen Hemminger
20
4.08%
3
6.98%
Alexey Dobriyan
13
2.65%
1
2.33%
Jiri Kosina
12
2.45%
1
2.33%
Salam Noureddine
11
2.24%
1
2.33%
Tom Gundersen
10
2.04%
1
2.33%
Peter P. Waskiewicz Jr
7
1.43%
2
4.65%
Vlad Dogaru
6
1.22%
1
2.33%
Ben Hutchings
6
1.22%
1
2.33%
Pablo Neira Ayuso
5
1.02%
1
2.33%
Herbert Xu
4
0.82%
1
2.33%
Hideaki Yoshifuji / 吉藤英明
4
0.82%
1
2.33%
Pavel Emelyanov
4
0.82%
1
2.33%
Joe Perches
2
0.41%
1
2.33%
Michael Dalton
2
0.41%
1
2.33%
Jesper Dangaard Brouer
1
0.20%
1
2.33%
Paolo 'Blaisorblade' Giarrusso
1
0.20%
1
2.33%
Total
490
100.00%
43
100.00%


EXPORT_SYMBOL(alloc_netdev_mqs);

/**
 * free_netdev - free network device
 * @dev: device
 *
 * This function does the last stage of destroying an allocated device
 * interface. The reference to the device object is released. If this
 * is the last reference then it will be freed.Must be called in process
 * context.
 */


void free_netdev(struct net_device *dev)
{
	struct napi_struct *p, *n;

	might_sleep();
	netif_free_tx_queues(dev);
#ifdef CONFIG_SYSFS
	kvfree(dev->_rx);
#endif

	kfree(rcu_dereference_protected(dev->ingress_queue, 1));

	/* Flush device addresses */
	dev_addr_flush(dev);

	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

	free_percpu(dev->pcpu_refcnt);
	dev->pcpu_refcnt = NULL;

	/*  Compatibility with error handling in drivers */
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		netdev_freemem(dev);
		return;
	}

	BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
	dev->reg_state = NETREG_RELEASED;

	/* will free via device release */
	put_device(&dev->dev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
47
37.60%
2
12.50%
Eric Dumazet
30
24.00%
6
37.50%
Herbert Xu
23
18.40%
1
6.25%
Tom Herbert
10
8.00%
1
6.25%
Peter P. Waskiewicz Jr
4
3.20%
1
6.25%
David S. Miller
4
3.20%
1
6.25%
Greg Kroah-Hartman
3
2.40%
1
6.25%
Jiri Pirko
2
1.60%
1
6.25%
Michael Dalton
1
0.80%
1
6.25%
Pankaj Gupta
1
0.80%
1
6.25%
Total
125
100.00%
16
100.00%


EXPORT_SYMBOL(free_netdev);

/**
 *      synchronize_net -  Synchronize with packet receive processing
 *
 *      Wait for packets currently being received to be done.
 *      Does not block later packets from starting.
 */


void synchronize_net(void)
{
	might_sleep();
	if (rtnl_is_locked())
		synchronize_rcu_expedited();
	else
		synchronize_rcu();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
12
54.55%
2
50.00%
Eric Dumazet
9
40.91%
1
25.00%
Paul E. McKenney
1
4.55%
1
25.00%
Total
22
100.00%
4
100.00%


EXPORT_SYMBOL(synchronize_net);

/**
 *      unregister_netdevice_queue - remove device from the kernel
 *      @dev: device
 *      @head: list
 *
 *      This function shuts down a device interface and removes it
 *      from the kernel tables.
 *      If head not NULL, device is queued to be unregistered later.
 *
 *      Callers must hold the rtnl semaphore.  You may want
 *      unregister_netdev() instead of this.
 */



void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
{
	ASSERT_RTNL();

	if (head) {
		list_move_tail(&dev->unreg_list, head);
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
24
50.00%
1
11.11%
Linus Torvalds (pre-git)
8
16.67%
1
11.11%
Stephen Hemminger
7
14.58%
3
33.33%
David S. Miller
4
8.33%
1
11.11%
Herbert Xu
3
6.25%
1
11.11%
Eric W. Biedermann
1
2.08%
1
11.11%
Daniel Lezcano
1
2.08%
1
11.11%
Total
48
100.00%
9
100.00%


EXPORT_SYMBOL(unregister_netdevice_queue);

/**
 *      unregister_netdevice_many - unregister many devices
 *      @head: list of devices
 *
 *  Note: As most callers use a stack allocated list_head,
 *  we force a list_del() to make sure stack wont be corrupted later.
 */


void unregister_netdevice_many(struct list_head *head)
{
	struct net_device *dev;

	if (!list_empty(head)) {
		rollback_registered_many(head);
		list_for_each_entry(dev, head, unreg_list)
			net_set_todo(dev);
		list_del(head);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
48
100.00%
2
100.00%
Total
48
100.00%
2
100.00%


EXPORT_SYMBOL(unregister_netdevice_many);

/**
 *      unregister_netdev - remove device from the kernel
 *      @dev: device
 *
 *      This function shuts down a device interface and removes it
 *      from the kernel tables.
 *
 *      This is just a wrapper for unregister_netdevice that takes
 *      the rtnl semaphore.  In general you want to use this and not
 *      unregister_netdevice.
 */


void unregister_netdev(struct net_device *dev)
{
	rtnl_lock();
	unregister_netdevice(dev);
	rtnl_unlock();
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%


EXPORT_SYMBOL(unregister_netdev);

/**
 *      dev_change_net_namespace - move device to different nethost namespace
 *      @dev: device
 *      @net: network namespace
 *      @pat: If not NULL name pattern to try if the current device name
 *            is already taken in the destination network namespace.
 *
 *      This function shuts down a device interface and moves it
 *      to a new network namespace. On success 0 is returned, on
 *      a failure a netagive errno code is returned.
 *
 *      Callers must hold the rtnl semaphore.
 */



int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
{
	int err;

	ASSERT_RTNL();

	/* Don't allow namespace local devices to be moved. */
	err = -EINVAL;
	if (dev->features & NETIF_F_NETNS_LOCAL)
		goto out;

	/* Ensure the device has been registrered */
	if (dev->reg_state != NETREG_REGISTERED)
		goto out;

	/* Get out if there is nothing todo */
	err = 0;
	if (net_eq(dev_net(dev), net))
		goto out;

	/* Pick the destination device name, and ensure
         * we can use it in the destination network namespace.
         */
	err = -EEXIST;
	if (__dev_get_by_name(net, dev->name)) {
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
		if (dev_get_valid_name(net, dev, pat) < 0)
			goto out;
	}

	/*
         * And now a mini version of register_netdevice unregister_netdevice.
         */

	/* If device is running close it first. */
	dev_close(dev);

	/* And unlink it from device chain */
	err = -ENODEV;
	unlist_netdevice(dev);

	synchronize_net();

	/* Shutdown queueing discipline. */
	dev_shutdown(dev);

	/* Notify protocols, that we are about to destroy
         * this device. They should clean all the things.
         *
         * Note that dev->reg_state stays at NETREG_REGISTERED.
         * This is wanted because this way 8021q and macvlan know
         * the device is just moving and can keep their slaves up.
         */
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
	rcu_barrier();
	call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
	rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);

	/*
         *      Flush the unicast and multicast chains
         */
	dev_uc_flush(dev);
	dev_mc_flush(dev);

	/* Send a netdev-removed uevent to the old namespace */
	kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
	netdev_adjacent_del_links(dev);

	/* Actually switch the network namespace */
	dev_net_set(dev, net);

	/* If there is an ifindex conflict assign a new one */
	if (__dev_get_by_index(net, dev->ifindex))
		dev->ifindex = dev_new_index(net);

	/* Send a netdev-add uevent to the new namespace */
	kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
	netdev_adjacent_add_links(dev);

	/* Fixup kobjects */
	err = device_rename(&dev->dev, dev->name);
	WARN_ON(err);

	/* Add the device back in the hashes */
	list_netdevice(dev);

	/* Notify protocols, that a new device appeared. */
	call_netdevice_notifiers(NETDEV_REGISTER, dev);

	/*
         *      Prevent userspace races by waiting until the network
         *      device is fully setup before sending notifications.
         */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);

	synchronize_net();
	err = 0;
out:
	return err;
}
Contributors
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Eric W. Biedermann
225
72.35%
5
23.81%
Serge E. Hallyn
26
8.36%
1
4.76%
Hideaki Yoshifuji / 吉藤英明
11
3.54%
2
9.52%
Octavian Purdila
10
3.22%
2
9.52%
Alexander Y. Fomichev
10
3.22%
1
4.76%
Rusty Russell
9
2.89%
1
4.76%
Jiri Pirko
8
2.57%
4
19.05%
Gao Feng
6
1.93%
2
9.52%
Alexei Starovoitov
4
1.29%
1
4.76%
Daniel Lezcano
1
0.32%
1
4.76%
Tobin C Harding
1
0.32%
1
4.76%
Total
311
100.00%
21
100.00%


EXPORT_SYMBOL_GPL(dev_change_net_namespace);



static int dev_cpu_dead(unsigned int oldcpu)
{
	struct sk_buff **list_skb;
	struct sk_buff *skb;
	unsigned int cpu;
	struct softnet_data *sd, *oldsd;

	local_irq_disable();
	cpu = smp_processor_id();
	sd = &per_cpu(softnet_data, cpu);
	oldsd = &per_cpu(softnet_data, oldcpu);

	/* Find end of our completion_queue. */
	list_skb = &sd->completion_queue;
	while (*list_skb)
		list_skb = &(*list_skb)->next;
	/* Append completion queue from offline CPU. */
	*list_skb = oldsd->completion_queue;
	oldsd->completion_queue = NULL;

	/* Append output queue from offline CPU. */
	if (oldsd->output_queue) {
		*sd->output_queue_tailp = oldsd->output_queue;
		sd->output_queue_tailp = oldsd->output_queue_tailp;
		oldsd->output_queue = NULL;
		oldsd->output_queue_tailp = &oldsd->output_queue;
	}
	/* Append NAPI poll list from offline CPU, with one exception :
         * process_backlog() must be called by cpu owning percpu backlog.
         * We properly handle process_queue & input_pkt_queue later.
         */
	while (!list_empty(&oldsd->poll_list)) {
		struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
							    struct napi_struct,
							    poll_list);

		list_del_init(&napi->poll_list);
		if (napi->poll == process_backlog)
			napi->state = 0;
		else
			____napi_schedule(sd, napi);
	}

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
	while ((skb = __skb_dequeue(&oldsd->process_queue))) {
		netif_rx_ni(skb);
		input_queue_head_incr(oldsd);
	}
	while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
		netif_rx_ni(skb);
		input_queue_head_incr(oldsd);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rusty Russell
126
47.55%
1
10.00%
Changli Gao
42
15.85%
2
20.00%
Eric Dumazet
39
14.72%
2
20.00%
Heiko Carstens
25
9.43%
1
10.00%
Tom Herbert
16
6.04%
2
20.00%
Eric W. Biedermann
13
4.91%
1
10.00%
Sebastian Andrzej Siewior
4
1.51%
1
10.00%
Total
265
100.00%
10
100.00%

/**
 *      netdev_increment_features - increment feature set by one
 *      @all: current feature set
 *      @one: new feature set
 *      @mask: mask feature set
 *
 *      Computes a new feature set after adding a device with feature set
 *      @one to the master device with current feature set @all.  Will not
 *      enable anything that is off in @mask. Returns the new feature set.
 */


netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask)
{
	if (mask & NETIF_F_HW_CSUM)
		mask |= NETIF_F_CSUM_MASK;
	mask |= NETIF_F_VLAN_CHALLENGED;

	all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
	all &= one | ~NETIF_F_ALL_FOR_ALL;

	/* If one device supports hw checksumming, set for all. */
	if (all & NETIF_F_HW_CSUM)
		all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);

	return all;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Herbert Xu
32
47.76%
2
28.57%
Michał Mirosław
22
32.84%
2
28.57%
Tom Herbert
13
19.40%
3
42.86%
Total
67
100.00%
7
100.00%


EXPORT_SYMBOL(netdev_increment_features);



static struct hlist_head * __net_init netdev_create_hash(void)
{
	int i;
	struct hlist_head *hash;

	hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
	if (hash != NULL)
		for (i = 0; i < NETDEV_HASHENTRIES; i++)
			INIT_HLIST_HEAD(&hash[i]);

	return hash;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Emelyanov
64
98.46%
1
50.00%
Baruch Siach
1
1.54%
1
50.00%
Total
65
100.00%
2
100.00%

/* Initialize per network namespace state */


static int __net_init netdev_init(struct net *net)
{
	if (net != &init_net)
		INIT_LIST_HEAD(&net->dev_base_head);

	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;

	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;

	return 0;

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
36
44.44%
1
9.09%
Pavel Emelyanov
22
27.16%
2
18.18%
Mark D Rustad
7
8.64%
1
9.09%
Stephen Hemminger
6
7.41%
2
18.18%
Linus Torvalds (pre-git)
4
4.94%
2
18.18%
Arnaldo Carvalho de Melo
3
3.70%
1
9.09%
Kai Germaschewski
3
3.70%
2
18.18%
Total
81
100.00%
11
100.00%

/**
 *      netdev_drivername - network driver for the device
 *      @dev: network device
 *
 *      Determine network driver for device.
 */


const char *netdev_drivername(const struct net_device *dev)
{
	const struct device_driver *driver;
	const struct device *parent;
	const char *empty = "";

	parent = dev->dev.parent;
	if (!parent)
		return empty;

	driver = parent->driver;
	if (driver && driver->name)
		return driver->name;
	return empty;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Arjan van de Ven
55
78.57%
1
33.33%
David S. Miller
12
17.14%
1
33.33%
Stephen Hemminger
3
4.29%
1
33.33%
Total
70
100.00%
3
100.00%



static void __netdev_printk(const char *level, const struct net_device *dev,
			    struct va_format *vaf)
{
	if (dev && dev->dev.parent) {
		dev_printk_emit(level[1] - '0',
				dev->dev.parent,
				"%s %s %s%s: %pV",
				dev_driver_string(dev->dev.parent),
				dev_name(dev->dev.parent),
				netdev_name(dev), netdev_reg_state(dev),
				vaf);
	} else if (dev) {
		printk("%s%s%s: %pV",
		       level, netdev_name(dev), netdev_reg_state(dev), vaf);
	} else {
		printk("%s(NULL net_device): %pV", level, vaf);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joe Perches
108
90.00%
4
80.00%
Veaceslav Falico
12
10.00%
1
20.00%
Total
120
100.00%
5
100.00%



void netdev_printk(const char *level, const struct net_device *dev,
		   const char *format, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, format);

	vaf.fmt = format;
	vaf.va = &args;

	__netdev_printk(level, dev, &vaf);

	va_end(args);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Joe Perches
65
100.00%
2
100.00%
Total
65
100.00%
2
100.00%


EXPORT_SYMBOL(netdev_printk);


#define define_netdev_printk_level(func, level)			\
void func(const struct net_device *dev, const char *fmt, ...)   \
{                                                               \
        struct va_format vaf;                                   \
        va_list args;                                           \
                                                                \
        va_start(args, fmt);                                    \
                                                                \
        vaf.fmt = fmt;                                          \
        vaf.va = &args;                                         \
                                                                \
        __netdev_printk(level, dev, &vaf);                      \
                                                                \
        va_end(args);                                           \
}                                                               \
EXPORT_SYMBOL(func);

define_netdev_printk_level(netdev_emerg, KERN_EMERG);
define_netdev_printk_level(netdev_alert, KERN_ALERT);
define_netdev_printk_level(netdev_crit, KERN_CRIT);
define_netdev_printk_level(netdev_err, KERN_ERR);
define_netdev_printk_level(netdev_warn, KERN_WARNING);
define_netdev_printk_level(netdev_notice, KERN_NOTICE);
define_netdev_printk_level(netdev_info, KERN_INFO);



static void __net_exit netdev_exit(struct net *net)
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
25
96.15%
1
50.00%
Pavel Emelyanov
1
3.85%
1
50.00%
Total
26
100.00%
2
100.00%


static struct pernet_operations __net_initdata netdev_net_ops = {
	.init = netdev_init,
	.exit = netdev_exit,
};



static void __net_exit default_device_exit(struct net *net)
{
	struct net_device *dev, *aux;
	/*
         * Push all migratable network devices back to the
         * initial network namespace
         */
	rtnl_lock();
	for_each_netdev_safe(net, dev, aux) {
		int err;
		char fb_name[IFNAMSIZ];

		/* Ignore unmoveable devices (i.e. loopback) */
		if (dev->features & NETIF_F_NETNS_LOCAL)
			continue;

		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;

		/* Push remaining network devices to init_net */
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
		if (err) {
			pr_emerg("%s: failed to move %s to init_net: %d\n",
				 __func__, dev->name, err);
			BUG();
		}
	}
	rtnl_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
87
77.68%
3
42.86%
Pavel Emelyanov
23
20.54%
2
28.57%
Lucas De Marchi
1
0.89%
1
14.29%
Joe Perches
1
0.89%
1
14.29%
Total
112
100.00%
7
100.00%



static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
{
	/* Return with the rtnl_lock held when there are no network
         * devices unregistering in any network namespace in net_list.
         */
	struct net *net;
	bool unregistering;
	DEFINE_WAIT_FUNC(wait, woken_wake_function);

	add_wait_queue(&netdev_unregistering_wq, &wait);
	for (;;) {
		unregistering = false;
		rtnl_lock();
		list_for_each_entry(net, net_list, exit_list) {
			if (net->dev_unreg_count > 0) {
				unregistering = true;
				break;
			}
		}
		if (!unregistering)
			break;
		__rtnl_unlock();

		wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
	}
	remove_wait_queue(&netdev_unregistering_wq, &wait);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
84
80.77%
1
50.00%
Peter Zijlstra
20
19.23%
1
50.00%
Total
104
100.00%
2
100.00%



static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
         * namespace.  Do this in the reverse order of registration.
         * Do this across as many network namespaces as possible to
         * improve batching efficiency.
         */
	struct net_device *dev;
	struct net *net;
	LIST_HEAD(dev_kill_list);

	/* To prevent network device cleanup code from dereferencing
         * loopback devices or network devices that have been freed
         * wait here for all pending unregistrations to complete,
         * before unregistring the loopback device and allowing the
         * network namespace be freed.
         *
         * The netdev todo list containing all network devices
         * unregistrations that happen in default_device_exit_batch
         * will run in the rtnl_unlock() at the end of
         * default_device_exit_batch.
         */
	rtnl_lock_unregistering(net_list);
	list_for_each_entry(net, net_list, exit_list) {
		for_each_netdev_reverse(net, dev) {
			if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
				dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
			else
				unregister_netdevice_queue(dev, &dev_kill_list);
		}
	}
	unregister_netdevice_many(&dev_kill_list);
	rtnl_unlock();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
87
92.55%
2
50.00%
Jiri Pirko
6
6.38%
1
25.00%
Uwe Kleine-König
1
1.06%
1
25.00%
Total
94
100.00%
4
100.00%


static struct pernet_operations __net_initdata default_device_ops = {
	.exit = default_device_exit,
	.exit_batch = default_device_exit_batch,
};

/*
 *      Initialize the DEV module. At boot time this walks the device list and
 *      unhooks any devices that fail to initialise (normally hardware not
 *      present) and leaves us with a valid list of present and active devices.
 *
 */

/*
 *       This is called single threaded during boot, so no need
 *       to take the rtnl semaphore.
 */


static int __init net_dev_init(void)
{
	int i, rc = -ENOMEM;

	BUG_ON(!dev_boot_phase);

	if (dev_proc_init())
		goto out;

	if (netdev_kobject_init())
		goto out;

	INIT_LIST_HEAD(&ptype_all);
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
		INIT_LIST_HEAD(&ptype_base[i]);

	INIT_LIST_HEAD(&offload_base);

	if (register_pernet_subsys(&netdev_net_ops))
		goto out;

	/*
         *      Initialise the packet receive queues.
         */

	for_each_possible_cpu(i) {
		struct work_struct *flush = per_cpu_ptr(&flush_works, i);
		struct softnet_data *sd = &per_cpu(softnet_data, i);

		INIT_WORK(flush, flush_backlog);

		skb_queue_head_init(&sd->input_pkt_queue);
		skb_queue_head_init(&sd->process_queue);
		INIT_LIST_HEAD(&sd->poll_list);
		sd->output_queue_tailp = &sd->output_queue;
#ifdef CONFIG_RPS
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->cpu = i;
#endif

		sd->backlog.poll = process_backlog;
		sd->backlog.weight = weight_p;
	}

	dev_boot_phase = 0;

	/* The loopback device is special if any other network devices
         * is present in a network namespace the loopback device must
         * be present. Since we now dynamically allocate and free the
         * loopback device ensure this invariant is maintained by
         * keeping the loopback device as the first device on the
         * list of network devices.  Ensuring the loopback devices
         * is the first device that appears and the last network device
         * that disappears.
         */
	if (register_pernet_device(&loopback_net_ops))
		goto out;

	if (register_pernet_device(&default_device_ops))
		goto out;

	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);

	rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead",
				       NULL, dev_cpu_dead);
	WARN_ON(rc < 0);
	dst_subsys_init();
	rc = 0;
out:
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric W. Biedermann
80
29.30%
3
9.68%
Eric Dumazet
40
14.65%
5
16.13%
Linus Torvalds (pre-git)
39
14.29%
7
22.58%
Stephen Hemminger
24
8.79%
3
9.68%
Tom Herbert
17
6.23%
2
6.45%
Changli Gao
17
6.23%
2
6.45%
David S. Miller
16
5.86%
1
3.23%
Sebastian Andrzej Siewior
15
5.49%
1
3.23%
Arnaldo Carvalho de Melo
7
2.56%
1
3.23%
Vlad Yasevich
6
2.20%
1
3.23%
Rusty Russell
5
1.83%
1
3.23%
Andi Kleen
4
1.47%
1
3.23%
Thomas Graf
1
0.37%
1
3.23%
Kamezawa Hiroyuki
1
0.37%
1
3.23%
Pavel Emelyanov
1
0.37%
1
3.23%
Total
273
100.00%
31
100.00%


subsys_initcall(net_dev_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Dumazet
4432
14.17%
146
15.63%
Alexander Duyck
2088
6.68%
21
2.25%
Herbert Xu
2009
6.42%
43
4.60%
Linus Torvalds (pre-git)
1773
5.67%
66
7.07%
Veaceslav Falico
1427
4.56%
15
1.61%
Stephen Hemminger
1285
4.11%
52
5.57%
Eric W. Biedermann
1248
3.99%
26
2.78%
Américo Wang
1149
3.67%
8
0.86%
Jiri Pirko
1134
3.63%
38
4.07%
David S. Miller
1080
3.45%
48
5.14%
Tom Herbert
945
3.02%
27
2.89%
Ben Hutchings
923
2.95%
22
2.36%
David Ahern
830
2.65%
8
0.86%
Daniel Borkmann
478
1.53%
11
1.18%
Michał Mirosław
461
1.47%
23
2.46%
Vlad Yasevich
430
1.37%
10
1.07%
Jarod Wilson
423
1.35%
6
0.64%
Changli Gao
417
1.33%
10
1.07%
Alexander Y. Fomichev
408
1.30%
2
0.21%
Jarek Poplawski
403
1.29%
3
0.32%
Pravin B Shelar
391
1.25%
7
0.75%
John Fastabend
351
1.12%
7
0.75%
Patrick McHardy
314
1.00%
13
1.39%
Salam Noureddine
271
0.87%
1
0.11%
Joe Perches
265
0.85%
7
0.75%
Willem de Bruijn
258
0.82%
6
0.64%
Denys Vlasenko
252
0.81%
2
0.21%
Krishna Kumar
251
0.80%
3
0.32%
Octavian Purdila
241
0.77%
3
0.32%
Jerry Chu
238
0.76%
3
0.32%
Linus Torvalds
235
0.75%
11
1.18%
Jesse Gross
209
0.67%
12
1.28%
Pavel Emelyanov
206
0.66%
11
1.18%
Daniel Lezcano
202
0.65%
3
0.32%
Eliezer Tamir
192
0.61%
1
0.11%
Nicolas Dichtel
184
0.59%
4
0.43%
Christoph Hellwig
167
0.53%
4
0.43%
Rusty Russell
147
0.47%
3
0.32%
Arnaldo Carvalho de Melo
138
0.44%
9
0.96%
Brenden Blanco
121
0.39%
1
0.11%
Paolo Abeni
103
0.33%
1
0.11%
Simon Horman
103
0.33%
4
0.43%
Neil Horman
102
0.33%
4
0.43%
Pablo Neira Ayuso
100
0.32%
2
0.21%
Jason (Hui) Wang
98
0.31%
6
0.64%
Nicolas Schichan
96
0.31%
1
0.11%
Patrick Mullaney
86
0.27%
1
0.11%
FUJITA Tomonori
78
0.25%
1
0.11%
Mel Gorman
78
0.25%
1
0.11%
Gao Feng
76
0.24%
2
0.21%
Eric Leblond
76
0.24%
2
0.21%
Toshiaki Makita
74
0.24%
5
0.54%
Jeff Garzik
70
0.22%
3
0.32%
Benjamin Herrenschmidt
70
0.22%
1
0.11%
Mahesh Bandewar
69
0.22%
3
0.32%
Michel Machado
64
0.20%
1
0.11%
Anuradha Karuppiah
62
0.20%
1
0.11%
Arjan van de Ven
58
0.19%
2
0.21%
Ding Tianhong
53
0.17%
3
0.32%
Moni Shoua
52
0.17%
1
0.11%
Johannes Berg
51
0.16%
3
0.32%
Julian Anastasov
44
0.14%
2
0.21%
Tom Gundersen
42
0.13%
2
0.21%
Jesper Dangaard Brouer
40
0.13%
4
0.43%
Steffen Klassert
40
0.13%
2
0.21%
Arnd Bergmann
39
0.12%
1
0.11%
David L Stevens
39
0.12%
1
0.11%
Koki Sanagi
37
0.12%
3
0.32%
Stanislaw Gruszka
36
0.12%
1
0.11%
Andi Kleen
36
0.12%
2
0.21%
Thomas Graf
36
0.12%
2
0.21%
Andrew Morton
36
0.12%
3
0.32%
Loic Prylli
35
0.11%
1
0.11%
Brian Haley
35
0.11%
1
0.11%
Or Gerlitz
35
0.11%
3
0.32%
Alexei Starovoitov
35
0.11%
2
0.21%
Michael S. Tsirkin
34
0.11%
4
0.43%
Michal Kubeček
32
0.10%
3
0.32%
Pankaj Gupta
32
0.10%
1
0.11%
Hideaki Yoshifuji / 吉藤英明
31
0.10%
3
0.32%
Jay Vosburgh
30
0.10%
2
0.21%
Ian Campbell
30
0.10%
1
0.11%
Matthias Tafelmeier
27
0.09%
1
0.11%
Aaron Conole
27
0.09%
2
0.21%
Serge E. Hallyn
26
0.08%
1
0.11%
Theodore Y. Ts'o
26
0.08%
1
0.11%
Heiko Carstens
25
0.08%
1
0.11%
Oliver Hartkopp
23
0.07%
1
0.11%
Florian Zumbiehl
23
0.07%
1
0.11%
Roland Dreier
23
0.07%
2
0.21%
Peter Zijlstra
22
0.07%
2
0.21%
Andrew Collins
22
0.07%
1
0.11%
Sebastian Andrzej Siewior
22
0.07%
2
0.21%
Jamal Hadi Salim
22
0.07%
1
0.11%
Konstantin Khlebnikov
22
0.07%
1
0.11%
Phil Sutter
20
0.06%
3
0.32%
Weiping Pan (潘卫平)
20
0.06%
1
0.11%
Yuval Mintz
20
0.06%
1
0.11%
Nikolay Aleksandrov
20
0.06%
5
0.54%
Matt Mackall
19
0.06%
3
0.32%
Florian Westphal
18
0.06%
2
0.21%
Tobin C Harding
17
0.05%
2
0.21%
Maneesh Soni
16
0.05%
1
0.11%
Björn Mork
16
0.05%
1
0.11%
Richard Cochran
16
0.05%
2
0.21%
Wang Chen
15
0.05%
3
0.32%
Vlad Dogaru
15
0.05%
1
0.11%
Martin KaFai Lau
13
0.04%
1
0.11%
Ido Schimmel
13
0.04%
1
0.11%
Peter P. Waskiewicz Jr
13
0.04%
4
0.43%
Alexey Dobriyan
13
0.04%
1
0.11%
Jiri Kosina
12
0.04%
1
0.11%
Alexey Khoroshilov
12
0.04%
1
0.11%
James Morris
12
0.04%
1
0.11%
Sabrina Dubroca
11
0.04%
2
0.21%
Randy Dunlap
10
0.03%
4
0.43%
Roopa Prabhu
10
0.03%
1
0.11%
Christoph Lameter
10
0.03%
1
0.11%
Thomas Gleixner
10
0.03%
3
0.32%
Myungho Jung
9
0.03%
1
0.11%
Robert Love
9
0.03%
1
0.11%
Hariprasad Shenai
8
0.03%
1
0.11%
Rémi Denis-Courmont
8
0.03%
2
0.21%
Li RongQing
8
0.03%
3
0.32%
Matt Domsch
8
0.03%
1
0.11%
Tejun Heo
8
0.03%
2
0.21%
Ingo Molnar
8
0.03%
1
0.11%
Kris Katterjohn
8
0.03%
1
0.11%
François Romieu
7
0.02%
1
0.11%
Ben Greear
7
0.02%
1
0.11%
Mark D Rustad
7
0.02%
1
0.11%
Kai Germaschewski
7
0.02%
2
0.21%
Alan Stern
7
0.02%
2
0.21%
Andy Gospodarek
6
0.02%
1
0.11%
Stefan Rompf
6
0.02%
1
0.11%
Ed L. Cashin
6
0.02%
1
0.11%
Arthur Kepner
6
0.02%
1
0.11%
Sridhar Samudrala
6
0.02%
1
0.11%
Simon Barber
6
0.02%
1
0.11%
Matthew Thode
5
0.02%
1
0.11%
Ilpo Järvinen
5
0.02%
1
0.11%
Nishanth Aravamudan
5
0.02%
1
0.11%
Hannes Frederic Sowa
5
0.02%
1
0.11%
Greg Kroah-Hartman
5
0.02%
1
0.11%
Brandon Philips
5
0.02%
1
0.11%
Michael Dalton
5
0.02%
1
0.11%
Tommy S. Christensen
5
0.02%
1
0.11%
Cristian Bercaru
4
0.01%
1
0.11%
Jochen Friedrich
4
0.01%
1
0.11%
Sergey Lapin
4
0.01%
1
0.11%
Adrian Bunk
3
0.01%
3
0.32%
Rami Rosen
3
0.01%
1
0.11%
Denis V. Lunev
3
0.01%
2
0.21%
Rashika Kheria
3
0.01%
1
0.11%
Patrick Ohly
3
0.01%
1
0.11%
Steve Grubb
3
0.01%
1
0.11%
Christopher Leech
3
0.01%
1
0.11%
Stephen Rothwell
3
0.01%
1
0.11%
Joe Eykholt
3
0.01%
1
0.11%
Matti Linnanvuori
3
0.01%
1
0.11%
Al Viro
3
0.01%
2
0.21%
Michael Chan
2
0.01%
1
0.11%
Masanari Iida
2
0.01%
2
0.21%
Cheng Renquan
2
0.01%
1
0.11%
Bart De Schuymer
2
0.01%
1
0.11%
Javier Martinez Canillas
2
0.01%
1
0.11%
Paul E. McKenney
2
0.01%
2
0.21%
Subash Abhinov Kasiviswanathan
2
0.01%
1
0.11%
Dipankar Sarma
2
0.01%
1
0.11%
Emese Revfy
2
0.01%
1
0.11%
Lucas De Marchi
1
0.00%
1
0.11%
Petr Vandrovec
1
0.00%
1
0.11%
Frédéric Weisbecker
1
0.00%
1
0.11%
Baruch Siach
1
0.00%
1
0.11%
Borislav Petkov
1
0.00%
1
0.11%
Kusanagi Kouichi
1
0.00%
1
0.11%
Igor Maravić
1
0.00%
1
0.11%
Dave Hansen
1
0.00%
1
0.11%
Ananda Raju
1
0.00%
1
0.11%
Kamezawa Hiroyuki
1
0.00%
1
0.11%
Paolo 'Blaisorblade' Giarrusso
1
0.00%
1
0.11%
Jaswinder Singh Rajput
1
0.00%
1
0.11%
John Dykstra
1
0.00%
1
0.11%
Jan Engelhardt
1
0.00%
1
0.11%
Luis de Bethencourt
1
0.00%
1
0.11%
Zhi Yong Wu
1
0.00%
1
0.11%
Oleg Nesterov
1
0.00%
1
0.11%
Steven Cole
1
0.00%
1
0.11%
Jakub Kiciński
1
0.00%
1
0.11%
Uwe Kleine-König
1
0.00%
1
0.11%
Cong Wang
0.00%
0
0.00%
Total
31278
100.00%
934
100.00%
Directory: net/core

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