cregit-Linux how code gets into the kernel

Release 4.11 drivers/infiniband/core/roce_gid_mgmt.c

/*
 * Copyright (c) 2015, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "core_priv.h"

#include <linux/in.h>
#include <linux/in6.h>

/* For in6_dev_get/in6_dev_put */
#include <net/addrconf.h>
#include <net/bonding.h>

#include <rdma/ib_cache.h>
#include <rdma/ib_addr.h>


enum gid_op_type {
	
GID_DEL = 0,
	
GID_ADD
};


struct update_gid_event_work {
	
struct work_struct work;
	
union ib_gid       gid;
	
struct ib_gid_attr gid_attr;
	
enum gid_op_type gid_op;
};


#define ROCE_NETDEV_CALLBACK_SZ		3

struct netdev_event_work_cmd {
	
roce_netdev_callback	cb;
	
roce_netdev_filter	filter;
	
struct net_device	*ndev;
	
struct net_device	*filter_ndev;
};


struct netdev_event_work {
	
struct work_struct		work;
	
struct netdev_event_work_cmd	cmds[ROCE_NETDEV_CALLBACK_SZ];
};

static const struct {
	
bool (*is_supported)(const struct ib_device *device, u8 port_num);
	
enum ib_gid_type gid_type;
} 
PORT_CAP_TO_GID_TYPE[] = {
	{rdma_protocol_roce_eth_encap, IB_GID_TYPE_ROCE},
	{rdma_protocol_roce_udp_encap, IB_GID_TYPE_ROCE_UDP_ENCAP},
};


#define CAP_TO_GID_TABLE_SIZE	ARRAY_SIZE(PORT_CAP_TO_GID_TYPE)


unsigned long roce_gid_type_mask_support(struct ib_device *ib_dev, u8 port) { int i; unsigned int ret_flags = 0; if (!rdma_protocol_roce(ib_dev, port)) return 1UL << IB_GID_TYPE_IB; for (i = 0; i < CAP_TO_GID_TABLE_SIZE; i++) if (PORT_CAP_TO_GID_TYPE[i].is_supported(ib_dev, port)) ret_flags |= 1UL << PORT_CAP_TO_GID_TYPE[i].gid_type; return ret_flags; }

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EXPORT_SYMBOL(roce_gid_type_mask_support);
static void update_gid(enum gid_op_type gid_op, struct ib_device *ib_dev, u8 port, union ib_gid *gid, struct ib_gid_attr *gid_attr) { int i; unsigned long gid_type_mask = roce_gid_type_mask_support(ib_dev, port); for (i = 0; i < IB_GID_TYPE_SIZE; i++) { if ((1UL << i) & gid_type_mask) { gid_attr->gid_type = i; switch (gid_op) { case GID_ADD: ib_cache_gid_add(ib_dev, port, gid, gid_attr); break; case GID_DEL: ib_cache_gid_del(ib_dev, port, gid, gid_attr); break; } } } }

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enum bonding_slave_state { BONDING_SLAVE_STATE_ACTIVE = 1UL << 0, BONDING_SLAVE_STATE_INACTIVE = 1UL << 1, /* No primary slave or the device isn't a slave in bonding */ BONDING_SLAVE_STATE_NA = 1UL << 2, };
static enum bonding_slave_state is_eth_active_slave_of_bonding_rcu(struct net_device *dev, struct net_device *upper) { if (upper && netif_is_bond_master(upper)) { struct net_device *pdev = bond_option_active_slave_get_rcu(netdev_priv(upper)); if (pdev) return dev == pdev ? BONDING_SLAVE_STATE_ACTIVE : BONDING_SLAVE_STATE_INACTIVE; } return BONDING_SLAVE_STATE_NA; }

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#define REQUIRED_BOND_STATES (BONDING_SLAVE_STATE_ACTIVE | \ BONDING_SLAVE_STATE_NA)
static int is_eth_port_of_netdev(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { struct net_device *real_dev; int res; if (!rdma_ndev) return 0; rcu_read_lock(); real_dev = rdma_vlan_dev_real_dev(cookie); if (!real_dev) real_dev = cookie; res = ((rdma_is_upper_dev_rcu(rdma_ndev, cookie) && (is_eth_active_slave_of_bonding_rcu(rdma_ndev, real_dev) & REQUIRED_BOND_STATES)) || real_dev == rdma_ndev); rcu_read_unlock(); return res; }

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static int is_eth_port_inactive_slave(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { struct net_device *master_dev; int res; if (!rdma_ndev) return 0; rcu_read_lock(); master_dev = netdev_master_upper_dev_get_rcu(rdma_ndev); res = is_eth_active_slave_of_bonding_rcu(rdma_ndev, master_dev) == BONDING_SLAVE_STATE_INACTIVE; rcu_read_unlock(); return res; }

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static int pass_all_filter(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { return 1; }

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static int upper_device_filter(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { int res; if (!rdma_ndev) return 0; if (rdma_ndev == cookie) return 1; rcu_read_lock(); res = rdma_is_upper_dev_rcu(rdma_ndev, cookie); rcu_read_unlock(); return res; }

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static void update_gid_ip(enum gid_op_type gid_op, struct ib_device *ib_dev, u8 port, struct net_device *ndev, struct sockaddr *addr) { union ib_gid gid; struct ib_gid_attr gid_attr; rdma_ip2gid(addr, &gid); memset(&gid_attr, 0, sizeof(gid_attr)); gid_attr.ndev = ndev; update_gid(gid_op, ib_dev, port, &gid, &gid_attr); }

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static void enum_netdev_default_gids(struct ib_device *ib_dev, u8 port, struct net_device *event_ndev, struct net_device *rdma_ndev) { unsigned long gid_type_mask; rcu_read_lock(); if (!rdma_ndev || ((rdma_ndev != event_ndev && !rdma_is_upper_dev_rcu(rdma_ndev, event_ndev)) || is_eth_active_slave_of_bonding_rcu(rdma_ndev, netdev_master_upper_dev_get_rcu(rdma_ndev)) == BONDING_SLAVE_STATE_INACTIVE)) { rcu_read_unlock(); return; } rcu_read_unlock(); gid_type_mask = roce_gid_type_mask_support(ib_dev, port); ib_cache_gid_set_default_gid(ib_dev, port, rdma_ndev, gid_type_mask, IB_CACHE_GID_DEFAULT_MODE_SET); }

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static void bond_delete_netdev_default_gids(struct ib_device *ib_dev, u8 port, struct net_device *event_ndev, struct net_device *rdma_ndev) { struct net_device *real_dev = rdma_vlan_dev_real_dev(event_ndev); if (!rdma_ndev) return; if (!real_dev) real_dev = event_ndev; rcu_read_lock(); if (rdma_is_upper_dev_rcu(rdma_ndev, event_ndev) && is_eth_active_slave_of_bonding_rcu(rdma_ndev, real_dev) == BONDING_SLAVE_STATE_INACTIVE) { unsigned long gid_type_mask; rcu_read_unlock(); gid_type_mask = roce_gid_type_mask_support(ib_dev, port); ib_cache_gid_set_default_gid(ib_dev, port, rdma_ndev, gid_type_mask, IB_CACHE_GID_DEFAULT_MODE_DELETE); } else { rcu_read_unlock(); } }

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static void enum_netdev_ipv4_ips(struct ib_device *ib_dev, u8 port, struct net_device *ndev) { struct in_device *in_dev; struct sin_list { struct list_head list; struct sockaddr_in ip; }; struct sin_list *sin_iter; struct sin_list *sin_temp; LIST_HEAD(sin_list); if (ndev->reg_state >= NETREG_UNREGISTERING) return; rcu_read_lock(); in_dev = __in_dev_get_rcu(ndev); if (!in_dev) { rcu_read_unlock(); return; } for_ifa(in_dev) { struct sin_list *entry = kzalloc(sizeof(*entry), GFP_ATOMIC); if (!entry) continue; entry->ip.sin_family = AF_INET; entry->ip.sin_addr.s_addr = ifa->ifa_address; list_add_tail(&entry->list, &sin_list); } endfor_ifa(in_dev); rcu_read_unlock(); list_for_each_entry_safe(sin_iter, sin_temp, &sin_list, list) { update_gid_ip(GID_ADD, ib_dev, port, ndev, (struct sockaddr *)&sin_iter->ip); list_del(&sin_iter->list); kfree(sin_iter); } }

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static void enum_netdev_ipv6_ips(struct ib_device *ib_dev, u8 port, struct net_device *ndev) { struct inet6_ifaddr *ifp; struct inet6_dev *in6_dev; struct sin6_list { struct list_head list; struct sockaddr_in6 sin6; }; struct sin6_list *sin6_iter; struct sin6_list *sin6_temp; struct ib_gid_attr gid_attr = {.ndev = ndev}; LIST_HEAD(sin6_list); if (ndev->reg_state >= NETREG_UNREGISTERING) return; in6_dev = in6_dev_get(ndev); if (!in6_dev) return; read_lock_bh(&in6_dev->lock); list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { struct sin6_list *entry = kzalloc(sizeof(*entry), GFP_ATOMIC); if (!entry) continue; entry->sin6.sin6_family = AF_INET6; entry->sin6.sin6_addr = ifp->addr; list_add_tail(&entry->list, &sin6_list); } read_unlock_bh(&in6_dev->lock); in6_dev_put(in6_dev); list_for_each_entry_safe(sin6_iter, sin6_temp, &sin6_list, list) { union ib_gid gid; rdma_ip2gid((struct sockaddr *)&sin6_iter->sin6, &gid); update_gid(GID_ADD, ib_dev, port, &gid, &gid_attr); list_del(&sin6_iter->list); kfree(sin6_iter); } }

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static void _add_netdev_ips(struct ib_device *ib_dev, u8 port, struct net_device *ndev) { enum_netdev_ipv4_ips(ib_dev, port, ndev); if (IS_ENABLED(CONFIG_IPV6)) enum_netdev_ipv6_ips(ib_dev, port, ndev); }

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static void add_netdev_ips(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { enum_netdev_default_gids(ib_dev, port, cookie, rdma_ndev); _add_netdev_ips(ib_dev, port, cookie); }

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static void del_netdev_ips(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { ib_cache_gid_del_all_netdev_gids(ib_dev, port, cookie); }

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static void enum_all_gids_of_dev_cb(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { struct net *net; struct net_device *ndev; /* Lock the rtnl to make sure the netdevs does not move under * our feet */ rtnl_lock(); for_each_net(net) for_each_netdev(net, ndev) if (is_eth_port_of_netdev(ib_dev, port, rdma_ndev, ndev)) add_netdev_ips(ib_dev, port, rdma_ndev, ndev); rtnl_unlock(); }

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/* This function will rescan all of the network devices in the system * and add their gids, as needed, to the relevant RoCE devices. */
int roce_rescan_device(struct ib_device *ib_dev) { ib_enum_roce_netdev(ib_dev, pass_all_filter, NULL, enum_all_gids_of_dev_cb, NULL); return 0; }

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static void callback_for_addr_gid_device_scan(struct ib_device *device, u8 port, struct net_device *rdma_ndev, void *cookie) { struct update_gid_event_work *parsed = cookie; return update_gid(parsed->gid_op, device, port, &parsed->gid, &parsed->gid_attr); }

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struct upper_list { struct list_head list; struct net_device *upper; };
static int netdev_upper_walk(struct net_device *upper, void *data) { struct upper_list *entry = kmalloc(sizeof(*entry), GFP_ATOMIC); struct list_head *upper_list = data; if (!entry) return 0; list_add_tail(&entry->list, upper_list); dev_hold(upper); entry->upper = upper; return 0; }

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static void handle_netdev_upper(struct ib_device *ib_dev, u8 port, void *cookie, void (*handle_netdev)(struct ib_device *ib_dev, u8 port, struct net_device *ndev)) { struct net_device *ndev = cookie; struct upper_list *upper_iter; struct upper_list *upper_temp; LIST_HEAD(upper_list); rcu_read_lock(); netdev_walk_all_upper_dev_rcu(ndev, netdev_upper_walk, &upper_list); rcu_read_unlock(); handle_netdev(ib_dev, port, ndev); list_for_each_entry_safe(upper_iter, upper_temp, &upper_list, list) { handle_netdev(ib_dev, port, upper_iter->upper); dev_put(upper_iter->upper); list_del(&upper_iter->list); kfree(upper_iter); } }

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static void _roce_del_all_netdev_gids(struct ib_device *ib_dev, u8 port, struct net_device *event_ndev) { ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev); }

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static void del_netdev_upper_ips(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { handle_netdev_upper(ib_dev, port, cookie, _roce_del_all_netdev_gids); }

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static void add_netdev_upper_ips(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { handle_netdev_upper(ib_dev, port, cookie, _add_netdev_ips); }

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static void del_netdev_default_ips_join(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { struct net_device *master_ndev; rcu_read_lock(); master_ndev = netdev_master_upper_dev_get_rcu(rdma_ndev); if (master_ndev) dev_hold(master_ndev); rcu_read_unlock(); if (master_ndev) { bond_delete_netdev_default_gids(ib_dev, port, master_ndev, rdma_ndev); dev_put(master_ndev); } }

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static void del_netdev_default_ips(struct ib_device *ib_dev, u8 port, struct net_device *rdma_ndev, void *cookie) { bond_delete_netdev_default_gids(ib_dev, port, cookie, rdma_ndev); }

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/* The following functions operate on all IB devices. netdevice_event and * addr_event execute ib_enum_all_roce_netdevs through a work. * ib_enum_all_roce_netdevs iterates through all IB devices. */
static void netdevice_event_work_handler(struct work_struct *_work) { struct netdev_event_work *work = container_of(_work, struct netdev_event_work, work); unsigned int i; for (i = 0; i < ARRAY_SIZE(work->cmds) && work->cmds[i].cb; i++) { ib_enum_all_roce_netdevs(work->cmds[i].filter, work->cmds[i].filter_ndev, work->cmds[i].cb, work->cmds[i].ndev); dev_put(work->cmds[i].ndev); dev_put(work->cmds[i].filter_ndev); } kfree(work); }

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static int netdevice_queue_work(struct netdev_event_work_cmd *cmds, struct net_device *ndev) { unsigned int i; struct netdev_event_work *ndev_work = kmalloc(sizeof(*ndev_work), GFP_KERNEL); if (!ndev_work) return NOTIFY_DONE; memcpy(ndev_work->cmds, cmds, sizeof(ndev_work->cmds)); for (i = 0; i < ARRAY_SIZE(ndev_work->cmds) && ndev_work->cmds[i].cb; i++) { if (!ndev_work->cmds[i].ndev) ndev_work->cmds[i].ndev = ndev; if (!ndev_work->cmds[i].filter_ndev) ndev_work->cmds[i].filter_ndev = ndev; dev_hold(ndev_work->cmds[i].ndev); dev_hold(ndev_work->cmds[i].filter_ndev); } INIT_WORK(&ndev_work->work, netdevice_event_work_handler); queue_work(ib_wq, &ndev_work->work); return NOTIFY_DONE; }

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static const struct netdev_event_work_cmd add_cmd = { .cb = add_netdev_ips, .filter = is_eth_port_of_netdev}; static const struct netdev_event_work_cmd add_cmd_upper_ips = { .cb = add_netdev_upper_ips, .filter = is_eth_port_of_netdev};
static void netdevice_event_changeupper(struct netdev_notifier_changeupper_info *changeupper_info, struct netdev_event_work_cmd *cmds) { static const struct netdev_event_work_cmd upper_ips_del_cmd = { .cb = del_netdev_upper_ips, .filter = upper_device_filter}; static const struct netdev_event_work_cmd bonding_default_del_cmd = { .cb = del_netdev_default_ips, .filter = is_eth_port_inactive_slave}; if (changeupper_info->linking == false) { cmds[0] = upper_ips_del_cmd; cmds[0].ndev = changeupper_info->upper_dev; cmds[1] = add_cmd; } else { cmds[0] = bonding_default_del_cmd; cmds[0].ndev = changeupper_info->upper_dev; cmds[1] = add_cmd_upper_ips; cmds[1].ndev = changeupper_info->upper_dev; cmds[1].filter_ndev = changeupper_info->upper_dev; } }

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static int netdevice_event(struct notifier_block *this, unsigned long event, void *ptr) { static const struct netdev_event_work_cmd del_cmd = { .cb = del_netdev_ips, .filter = pass_all_filter}; static const struct netdev_event_work_cmd bonding_default_del_cmd_join = { .cb = del_netdev_default_ips_join, .filter = is_eth_port_inactive_slave}; static const struct netdev_event_work_cmd default_del_cmd = { .cb = del_netdev_default_ips, .filter = pass_all_filter}; static const struct netdev_event_work_cmd bonding_event_ips_del_cmd = { .cb = del_netdev_upper_ips, .filter = upper_device_filter}; struct net_device *ndev = netdev_notifier_info_to_dev(ptr); struct netdev_event_work_cmd cmds[ROCE_NETDEV_CALLBACK_SZ] = { {NULL} }; if (ndev->type != ARPHRD_ETHER) return NOTIFY_DONE; switch (event) { case NETDEV_REGISTER: case NETDEV_UP: cmds[0] = bonding_default_del_cmd_join; cmds[1] = add_cmd; break; case NETDEV_UNREGISTER: if (ndev->reg_state < NETREG_UNREGISTERED) cmds[0] = del_cmd; else return NOTIFY_DONE; break; case NETDEV_CHANGEADDR: cmds[0] = default_del_cmd; cmds[1] = add_cmd; break; case NETDEV_CHANGEUPPER: netdevice_event_changeupper( container_of(ptr, struct netdev_notifier_changeupper_info, info), cmds); break; case NETDEV_BONDING_FAILOVER: cmds[0] = bonding_event_ips_del_cmd; cmds[1] = bonding_default_del_cmd_join; cmds[2] = add_cmd_upper_ips; break; default: return NOTIFY_DONE; } return netdevice_queue_work(cmds, ndev); }

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static void update_gid_event_work_handler(struct work_struct *_work) { struct update_gid_event_work *work = container_of(_work, struct update_gid_event_work, work); ib_enum_all_roce_netdevs(is_eth_port_of_netdev, work->gid_attr.ndev, callback_for_addr_gid_device_scan, work); dev_put(work->gid_attr.ndev); kfree(work); }

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static int addr_event(struct notifier_block *this, unsigned long event, struct sockaddr *sa, struct net_device *ndev) { struct update_gid_event_work *work; enum gid_op_type gid_op; if (ndev->type != ARPHRD_ETHER) return NOTIFY_DONE; switch (event) { case NETDEV_UP: gid_op = GID_ADD; break; case NETDEV_DOWN: gid_op = GID_DEL; break; default: return NOTIFY_DONE; } work = kmalloc(sizeof(*work), GFP_ATOMIC); if (!work) return NOTIFY_DONE; INIT_WORK(&work->work, update_gid_event_work_handler); rdma_ip2gid(sa, &work->gid); work->gid_op = gid_op; memset(&work->gid_attr, 0, sizeof(work->gid_attr)); dev_hold(ndev); work->gid_attr.ndev = ndev; queue_work(ib_wq, &work->work); return NOTIFY_DONE; }

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static int inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) { struct sockaddr_in in; struct net_device *ndev; struct in_ifaddr *ifa = ptr; in.sin_family = AF_INET; in.sin_addr.s_addr = ifa->ifa_address; ndev = ifa->ifa_dev->dev; return addr_event(this, event, (struct sockaddr *)&in, ndev); }

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Total77100.00%1100.00%


static int inet6addr_event(struct notifier_block *this, unsigned long event, void *ptr) { struct sockaddr_in6 in6; struct net_device *ndev; struct inet6_ifaddr *ifa6 = ptr; in6.sin6_family = AF_INET6; in6.sin6_addr = ifa6->addr; ndev = ifa6->idev->dev; return addr_event(this, event, (struct sockaddr *)&in6, ndev); }

Contributors

PersonTokensPropCommitsCommitProp
Matan Barak75100.00%1100.00%
Total75100.00%1100.00%

static struct notifier_block nb_netdevice = { .notifier_call = netdevice_event }; static struct notifier_block nb_inetaddr = { .notifier_call = inetaddr_event }; static struct notifier_block nb_inet6addr = { .notifier_call = inet6addr_event };
int __init roce_gid_mgmt_init(void) { register_inetaddr_notifier(&nb_inetaddr); if (IS_ENABLED(CONFIG_IPV6)) register_inet6addr_notifier(&nb_inet6addr); /* We relay on the netdevice notifier to enumerate all * existing devices in the system. Register to this notifier * last to make sure we will not miss any IP add/del * callbacks. */ register_netdevice_notifier(&nb_netdevice); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Matan Barak37100.00%1100.00%
Total37100.00%1100.00%


void __exit roce_gid_mgmt_cleanup(void) { if (IS_ENABLED(CONFIG_IPV6)) unregister_inet6addr_notifier(&nb_inet6addr); unregister_inetaddr_notifier(&nb_inetaddr); unregister_netdevice_notifier(&nb_netdevice); /* Ensure all gid deletion tasks complete before we go down, * to avoid any reference to free'd memory. By the time * ib-core is removed, all physical devices have been removed, * so no issue with remaining hardware contexts. */ }

Contributors

PersonTokensPropCommitsCommitProp
Matan Barak34100.00%1100.00%
Total34100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Matan Barak316096.78%666.67%
David Ahern872.66%111.11%
Parav Pandit90.28%111.11%
Linus Torvalds90.28%111.11%
Total3265100.00%9100.00%
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