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Release 4.14 net/openvswitch/datapath.h

Directory: net/openvswitch
 * Copyright (c) 2007-2014 Nicira, Inc.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA

#ifndef DATAPATH_H

#define DATAPATH_H 1

#include <asm/page.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/u64_stats_sync.h>
#include <net/ip_tunnels.h>

#include "conntrack.h"
#include "flow.h"
#include "flow_table.h"

#define DP_MAX_PORTS           USHRT_MAX


 * struct dp_stats_percpu - per-cpu packet processing statistics for a given
 * datapath.
 * @n_hit: Number of received packets for which a matching flow was found in
 * the flow table.
 * @n_miss: Number of received packets that had no matching flow in the flow
 * table.  The sum of @n_hit and @n_miss is the number of packets that have
 * been received by the datapath.
 * @n_lost: Number of received packets that had no matching flow in the flow
 * table that could not be sent to userspace (normally due to an overflow in
 * one of the datapath's queues).
 * @n_mask_hit: Number of masks looked up for flow match.
 *   @n_mask_hit / (@n_hit + @n_missed)  will be the average masks looked
 *   up per packet.

struct dp_stats_percpu {
u64 n_hit;
u64 n_missed;
u64 n_lost;
u64 n_mask_hit;
struct u64_stats_sync syncp;

 * struct datapath - datapath for flow-based packet switching
 * @rcu: RCU callback head for deferred destruction.
 * @list_node: Element in global 'dps' list.
 * @table: flow table.
 * @ports: Hash table for ports.  %OVSP_LOCAL port always exists.  Protected by
 * ovs_mutex and RCU.
 * @stats_percpu: Per-CPU datapath statistics.
 * @net: Reference to net namespace.
 * @max_headroom: the maximum headroom of all vports in this datapath; it will
 * be used by all the internal vports in this dp.
 * Context: See the comment on locking at the top of datapath.c for additional
 * locking information.

struct datapath {
struct rcu_head rcu;
struct list_head list_node;

	/* Flow table. */
struct flow_table table;

	/* Switch ports. */
struct hlist_head *ports;

	/* Stats. */
struct dp_stats_percpu __percpu *stats_percpu;

	/* Network namespace ref. */
possible_net_t net;

u32 user_features;

u32 max_headroom;

 * struct ovs_skb_cb - OVS data in skb CB
 * @input_vport: The original vport packet came in on. This value is cached
 * when a packet is received by OVS.
 * @mru: The maximum received fragement size; 0 if the packet is not
 * fragmented.
 * @acts_origlen: The netlink size of the flow actions applied to this skb.
 * @cutlen: The number of bytes from the packet end to be removed.

struct ovs_skb_cb {
struct vport		*input_vport;
u16			mru;
u16			acts_origlen;
u32			cutlen;

#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)

 * struct dp_upcall - metadata to include with a packet to send to userspace
 * @cmd: One of %OVS_PACKET_CMD_*.
 * @userdata: If nonnull, its variable-length value is passed to userspace as
 * @portid: Netlink portid to which packet should be sent.  If @portid is 0
 * then no packet is sent and the packet is accounted in the datapath's @n_lost
 * counter.
 * @egress_tun_info: If nonnull, becomes %OVS_PACKET_ATTR_EGRESS_TUN_KEY.
 * @mru: If not zero, Maximum received IP fragment size.

struct dp_upcall_info {
struct ip_tunnel_info *egress_tun_info;
const struct nlattr *userdata;
const struct nlattr *actions;
int actions_len;
u32 portid;
u8 cmd;
u16 mru;

 * struct ovs_net - Per net-namespace data for ovs.
 * @dps: List of datapaths to enable dumping them all out.
 * Protected by genl_mutex.

struct ovs_net {
struct list_head dps;
struct work_struct dp_notify_work;

	/* Module reference for configuring conntrack. */
bool xt_label;

extern unsigned int ovs_net_id;
void ovs_lock(void);
void ovs_unlock(void);

int lockdep_ovsl_is_held(void);

#define lockdep_ovsl_is_held()	1

#define ASSERT_OVSL()		WARN_ON(!lockdep_ovsl_is_held())

#define ovsl_dereference(p)					\
	rcu_dereference_protected(p, lockdep_ovsl_is_held())

#define rcu_dereference_ovsl(p)					\
	rcu_dereference_check(p, lockdep_ovsl_is_held())

static inline struct net *ovs_dp_get_net(const struct datapath *dp) { return read_pnet(&dp->net); }


Pravin B Shelar2395.83%150.00%
Thomas Graf14.17%150.00%

static inline void ovs_dp_set_net(struct datapath *dp, struct net *net) { write_pnet(&dp->net, net); }


Pravin B Shelar27100.00%1100.00%

struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no);
static inline struct vport *ovs_vport_rcu(const struct datapath *dp, int port_no) { WARN_ON_ONCE(!rcu_read_lock_held()); return ovs_lookup_vport(dp, port_no); }


Pravin B Shelar33100.00%1100.00%

static inline struct vport *ovs_vport_ovsl_rcu(const struct datapath *dp, int port_no) { WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); return ovs_lookup_vport(dp, port_no); }


Pravin B Shelar37100.00%1100.00%

static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_no) { ASSERT_OVSL(); return ovs_lookup_vport(dp, port_no); }


Pravin B Shelar29100.00%1100.00%

extern struct notifier_block ovs_dp_device_notifier; extern struct genl_family dp_vport_genl_family; void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key); void ovs_dp_detach_port(struct vport *); int ovs_dp_upcall(struct datapath *, struct sk_buff *, const struct sw_flow_key *, const struct dp_upcall_info *, uint32_t cutlen); const char *ovs_dp_name(const struct datapath *dp); struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq, u8 cmd); int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb, const struct sw_flow_actions *, struct sw_flow_key *); void ovs_dp_notify_wq(struct work_struct *work); int action_fifos_init(void); void action_fifos_exit(void); /* 'KEY' must not have any bits set outside of the 'MASK' */ #define OVS_MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK))) #define OVS_SET_MASKED(OLD, KEY, MASK) ((OLD) = OVS_MASKED(OLD, KEY, MASK)) #define OVS_NLERR(logging_allowed, fmt, ...) \ do { \ if (logging_allowed && net_ratelimit()) \ pr_info("netlink: " fmt "\n", ##__VA_ARGS__); \ } while (0) #endif /* datapath.h */

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Pravin B Shelar26645.78%721.88%
Jesse Gross19032.70%39.38%
Andy Zhou386.54%39.38%
Joe Stringer376.37%39.38%
Thomas Graf101.72%412.50%
Neil McKee91.55%13.12%
William Tu61.03%13.12%
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Liping Zhang40.69%13.12%
Paolo Abeni40.69%13.12%
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Jarno Rajahalme30.52%13.12%
Eric W. Biedermann20.34%26.25%
Wenyu Zhang10.17%13.12%
Américo Wang10.17%13.12%
Alexey Dobriyan10.17%13.12%
Directory: net/openvswitch
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