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OpenCloudOS-Kernel/drivers/infiniband/core/roce_gid_mgmt.c

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/*
* 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;
}
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;
}
}
}
}
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;
}
#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 *event_ndev = (struct net_device *)cookie;
struct net_device *real_dev;
int res;
if (!rdma_ndev)
return 0;
rcu_read_lock();
real_dev = rdma_vlan_dev_real_dev(event_ndev);
if (!real_dev)
real_dev = event_ndev;
res = ((rdma_is_upper_dev_rcu(rdma_ndev, event_ndev) &&
(is_eth_active_slave_of_bonding_rcu(rdma_ndev, real_dev) &
REQUIRED_BOND_STATES)) ||
real_dev == rdma_ndev);
rcu_read_unlock();
return res;
}
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;
}
static int pass_all_filter(struct ib_device *ib_dev, u8 port,
struct net_device *rdma_ndev, void *cookie)
{
return 1;
}
static int upper_device_filter(struct ib_device *ib_dev, u8 port,
struct net_device *rdma_ndev, void *cookie)
{
struct net_device *event_ndev = (struct net_device *)cookie;
int res;
if (!rdma_ndev)
return 0;
if (rdma_ndev == event_ndev)
return 1;
rcu_read_lock();
res = rdma_is_upper_dev_rcu(rdma_ndev, event_ndev);
rcu_read_unlock();
return res;
}
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);
}
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);
}
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();
}
}
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) {
pr_warn("roce_gid_mgmt: couldn't allocate entry for IPv4 update\n");
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);
}
}
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) {
pr_warn("roce_gid_mgmt: couldn't allocate entry for IPv6 update\n");
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);
}
}
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);
}
static void add_netdev_ips(struct ib_device *ib_dev, u8 port,
struct net_device *rdma_ndev, void *cookie)
{
struct net_device *event_ndev = (struct net_device *)cookie;
enum_netdev_default_gids(ib_dev, port, event_ndev, rdma_ndev);
_add_netdev_ips(ib_dev, port, event_ndev);
}
static void del_netdev_ips(struct ib_device *ib_dev, u8 port,
struct net_device *rdma_ndev, void *cookie)
{
struct net_device *event_ndev = (struct net_device *)cookie;
ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev);
}
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();
}
/* 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;
}
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);
}
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 = (struct net_device *)cookie;
struct upper_list {
struct list_head list;
struct net_device *upper;
};
struct net_device *upper;
struct list_head *iter;
struct upper_list *upper_iter;
struct upper_list *upper_temp;
LIST_HEAD(upper_list);
rcu_read_lock();
netdev_for_each_all_upper_dev_rcu(ndev, upper, iter) {
struct upper_list *entry = kmalloc(sizeof(*entry),
GFP_ATOMIC);
if (!entry) {
pr_info("roce_gid_mgmt: couldn't allocate entry to delete ndev\n");
continue;
}
list_add_tail(&entry->list, &upper_list);
dev_hold(upper);
entry->upper = upper;
}
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);
}
}
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);
}
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);
}
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);
}
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);
}
}
static void del_netdev_default_ips(struct ib_device *ib_dev, u8 port,
struct net_device *rdma_ndev, void *cookie)
{
struct net_device *event_ndev = (struct net_device *)cookie;
bond_delete_netdev_default_gids(ib_dev, port, event_ndev, rdma_ndev);
}
/* 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);
}
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) {
pr_warn("roce_gid_mgmt: can't allocate work for netdevice_event\n");
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;
}
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;
}
}
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);
}
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);
}
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) {
pr_warn("roce_gid_mgmt: Couldn't allocate work for addr_event\n");
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;
}
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);
}
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);
}
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;
}
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.
*/
}
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