2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005 Intel Corporation. All rights reserved.
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #include <linux/mutex.h>
37 #include <linux/inetdevice.h>
38 #include <linux/slab.h>
39 #include <linux/workqueue.h>
41 #include <net/neighbour.h>
42 #include <net/route.h>
43 #include <net/netevent.h>
44 #include <net/ipv6_stubs.h>
45 #include <net/ip6_route.h>
46 #include <rdma/ib_addr.h>
47 #include <rdma/ib_cache.h>
48 #include <rdma/ib_sa.h>
50 #include <rdma/rdma_netlink.h>
51 #include <net/netlink.h>
53 #include "core_priv.h"
56 struct list_head list;
57 struct sockaddr_storage src_addr;
58 struct sockaddr_storage dst_addr;
59 struct rdma_dev_addr *addr;
61 void (*callback)(int status, struct sockaddr *src_addr,
62 struct rdma_dev_addr *addr, void *context);
63 unsigned long timeout;
64 struct delayed_work work;
65 bool resolve_by_gid_attr; /* Consider gid attr in resolve phase */
70 static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
72 static DEFINE_SPINLOCK(lock);
73 static LIST_HEAD(req_list);
74 static struct workqueue_struct *addr_wq;
76 static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
77 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
78 .len = sizeof(struct rdma_nla_ls_gid),
79 .validation_type = NLA_VALIDATE_MIN,
80 .min = sizeof(struct rdma_nla_ls_gid)},
83 static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
85 struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
88 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
91 ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
92 nlmsg_len(nlh), ib_nl_addr_policy, NULL);
99 static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
101 const struct nlattr *head, *curr;
103 struct addr_req *req;
107 head = (const struct nlattr *)nlmsg_data(nlh);
108 len = nlmsg_len(nlh);
110 nla_for_each_attr(curr, head, len, rem) {
111 if (curr->nla_type == LS_NLA_TYPE_DGID)
112 memcpy(&gid, nla_data(curr), nla_len(curr));
116 list_for_each_entry(req, &req_list, list) {
117 if (nlh->nlmsg_seq != req->seq)
119 /* We set the DGID part, the rest was set earlier */
120 rdma_addr_set_dgid(req->addr, &gid);
125 spin_unlock_bh(&lock);
128 pr_info("Couldn't find request waiting for DGID: %pI6\n",
132 int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
133 struct nlmsghdr *nlh,
134 struct netlink_ext_ack *extack)
136 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
137 !(NETLINK_CB(skb).sk))
140 if (ib_nl_is_good_ip_resp(nlh))
141 ib_nl_process_good_ip_rsep(nlh);
146 static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
150 struct sk_buff *skb = NULL;
151 struct nlmsghdr *nlh;
152 struct rdma_ls_ip_resolve_header *header;
158 if (family == AF_INET) {
159 size = sizeof(struct in_addr);
160 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
162 size = sizeof(struct in6_addr);
163 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
166 len = nla_total_size(sizeof(size));
167 len += NLMSG_ALIGN(sizeof(*header));
169 skb = nlmsg_new(len, GFP_KERNEL);
173 data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
174 RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
180 /* Construct the family header first */
181 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
182 header->ifindex = dev_addr->bound_dev_if;
183 nla_put(skb, attrtype, size, daddr);
185 /* Repair the nlmsg header length */
187 rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
189 /* Make the request retry, so when we get the response from userspace
190 * we will have something.
195 int rdma_addr_size(const struct sockaddr *addr)
197 switch (addr->sa_family) {
199 return sizeof(struct sockaddr_in);
201 return sizeof(struct sockaddr_in6);
203 return sizeof(struct sockaddr_ib);
208 EXPORT_SYMBOL(rdma_addr_size);
210 int rdma_addr_size_in6(struct sockaddr_in6 *addr)
212 int ret = rdma_addr_size((struct sockaddr *) addr);
214 return ret <= sizeof(*addr) ? ret : 0;
216 EXPORT_SYMBOL(rdma_addr_size_in6);
218 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
220 int ret = rdma_addr_size((struct sockaddr *) addr);
222 return ret <= sizeof(*addr) ? ret : 0;
224 EXPORT_SYMBOL(rdma_addr_size_kss);
227 * rdma_copy_src_l2_addr - Copy netdevice source addresses
228 * @dev_addr: Destination address pointer where to copy the addresses
229 * @dev: Netdevice whose source addresses to copy
231 * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
232 * This includes unicast address, broadcast address, device type and
235 void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
236 const struct net_device *dev)
238 dev_addr->dev_type = dev->type;
239 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
240 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
241 dev_addr->bound_dev_if = dev->ifindex;
243 EXPORT_SYMBOL(rdma_copy_src_l2_addr);
245 static struct net_device *
246 rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
248 struct net_device *dev = NULL;
249 int ret = -EADDRNOTAVAIL;
251 switch (src_in->sa_family) {
253 dev = __ip_dev_find(net,
254 ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
259 #if IS_ENABLED(CONFIG_IPV6)
261 for_each_netdev_rcu(net, dev) {
262 if (ipv6_chk_addr(net,
263 &((const struct sockaddr_in6 *)src_in)->sin6_addr,
272 return ret ? ERR_PTR(ret) : dev;
275 int rdma_translate_ip(const struct sockaddr *addr,
276 struct rdma_dev_addr *dev_addr)
278 struct net_device *dev;
280 if (dev_addr->bound_dev_if) {
281 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
284 rdma_copy_src_l2_addr(dev_addr, dev);
290 dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
292 rdma_copy_src_l2_addr(dev_addr, dev);
294 return PTR_ERR_OR_ZERO(dev);
296 EXPORT_SYMBOL(rdma_translate_ip);
298 static void set_timeout(struct addr_req *req, unsigned long time)
302 delay = time - jiffies;
306 mod_delayed_work(addr_wq, &req->work, delay);
309 static void queue_req(struct addr_req *req)
312 list_add_tail(&req->list, &req_list);
313 set_timeout(req, req->timeout);
314 spin_unlock_bh(&lock);
317 static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
318 const void *daddr, u32 seq, u16 family)
320 if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
321 return -EADDRNOTAVAIL;
323 return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
326 static int dst_fetch_ha(const struct dst_entry *dst,
327 struct rdma_dev_addr *dev_addr,
333 n = dst_neigh_lookup(dst, daddr);
337 if (!(n->nud_state & NUD_VALID)) {
338 neigh_event_send(n, NULL);
341 neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);
349 static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
352 struct rt6_info *rt6;
354 if (family == AF_INET) {
355 rt = container_of(dst, struct rtable, dst);
356 return rt->rt_uses_gateway;
359 rt6 = container_of(dst, struct rt6_info, dst);
360 return rt6->rt6i_flags & RTF_GATEWAY;
363 static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
364 const struct sockaddr *dst_in, u32 seq)
366 const struct sockaddr_in *dst_in4 =
367 (const struct sockaddr_in *)dst_in;
368 const struct sockaddr_in6 *dst_in6 =
369 (const struct sockaddr_in6 *)dst_in;
370 const void *daddr = (dst_in->sa_family == AF_INET) ?
371 (const void *)&dst_in4->sin_addr.s_addr :
372 (const void *)&dst_in6->sin6_addr;
373 sa_family_t family = dst_in->sa_family;
377 /* If we have a gateway in IB mode then it must be an IB network */
378 if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
379 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
381 return dst_fetch_ha(dst, dev_addr, daddr);
384 static int addr4_resolve(struct sockaddr *src_sock,
385 const struct sockaddr *dst_sock,
386 struct rdma_dev_addr *addr,
389 struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
390 const struct sockaddr_in *dst_in =
391 (const struct sockaddr_in *)dst_sock;
393 __be32 src_ip = src_in->sin_addr.s_addr;
394 __be32 dst_ip = dst_in->sin_addr.s_addr;
399 memset(&fl4, 0, sizeof(fl4));
402 fl4.flowi4_oif = addr->bound_dev_if;
403 rt = ip_route_output_key(addr->net, &fl4);
404 ret = PTR_ERR_OR_ZERO(rt);
408 src_in->sin_addr.s_addr = fl4.saddr;
410 addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
416 #if IS_ENABLED(CONFIG_IPV6)
417 static int addr6_resolve(struct sockaddr *src_sock,
418 const struct sockaddr *dst_sock,
419 struct rdma_dev_addr *addr,
420 struct dst_entry **pdst)
422 struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
423 const struct sockaddr_in6 *dst_in =
424 (const struct sockaddr_in6 *)dst_sock;
426 struct dst_entry *dst;
428 memset(&fl6, 0, sizeof fl6);
429 fl6.daddr = dst_in->sin6_addr;
430 fl6.saddr = src_in->sin6_addr;
431 fl6.flowi6_oif = addr->bound_dev_if;
433 dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
437 if (ipv6_addr_any(&src_in->sin6_addr))
438 src_in->sin6_addr = fl6.saddr;
440 addr->hoplimit = ip6_dst_hoplimit(dst);
446 static int addr6_resolve(struct sockaddr *src_sock,
447 const struct sockaddr *dst_sock,
448 struct rdma_dev_addr *addr,
449 struct dst_entry **pdst)
451 return -EADDRNOTAVAIL;
455 static int addr_resolve_neigh(const struct dst_entry *dst,
456 const struct sockaddr *dst_in,
457 struct rdma_dev_addr *addr,
458 unsigned int ndev_flags,
463 if (ndev_flags & IFF_LOOPBACK) {
464 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
466 if (!(ndev_flags & IFF_NOARP)) {
467 /* If the device doesn't do ARP internally */
468 ret = fetch_ha(dst, addr, dst_in, seq);
474 static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
475 const struct sockaddr *dst_in,
476 const struct dst_entry *dst,
477 const struct net_device *ndev)
481 if (dst->dev->flags & IFF_LOOPBACK)
482 ret = rdma_translate_ip(dst_in, dev_addr);
484 rdma_copy_src_l2_addr(dev_addr, dst->dev);
487 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
488 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
489 * network type accordingly.
491 if (has_gateway(dst, dst_in->sa_family) &&
492 ndev->type != ARPHRD_INFINIBAND)
493 dev_addr->network = dst_in->sa_family == AF_INET ?
497 dev_addr->network = RDMA_NETWORK_IB;
502 static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
503 unsigned int *ndev_flags,
504 const struct sockaddr *dst_in,
505 const struct dst_entry *dst)
507 struct net_device *ndev = READ_ONCE(dst->dev);
509 *ndev_flags = ndev->flags;
510 /* A physical device must be the RDMA device to use */
511 if (ndev->flags & IFF_LOOPBACK) {
513 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
514 * loopback IP address. So if route is resolved to loopback
515 * interface, translate that to a real ndev based on non
516 * loopback IP address.
518 ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
523 return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
526 static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
528 struct net_device *ndev;
530 ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
532 return PTR_ERR(ndev);
535 * Since we are holding the rcu, reading net and ifindex
536 * are safe without any additional reference; because
537 * change_net_namespace() in net/core/dev.c does rcu sync
538 * after it changes the state to IFF_DOWN and before
539 * updating netdev fields {net, ifindex}.
541 addr->net = dev_net(ndev);
542 addr->bound_dev_if = ndev->ifindex;
546 static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
548 addr->net = &init_net;
549 addr->bound_dev_if = 0;
552 static int addr_resolve(struct sockaddr *src_in,
553 const struct sockaddr *dst_in,
554 struct rdma_dev_addr *addr,
556 bool resolve_by_gid_attr,
559 struct dst_entry *dst = NULL;
560 unsigned int ndev_flags = 0;
561 struct rtable *rt = NULL;
565 pr_warn_ratelimited("%s: missing namespace\n", __func__);
570 if (resolve_by_gid_attr) {
571 if (!addr->sgid_attr) {
573 pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
577 * If the request is for a specific gid attribute of the
578 * rdma_dev_addr, derive net from the netdevice of the
581 ret = set_addr_netns_by_gid_rcu(addr);
587 if (src_in->sa_family == AF_INET) {
588 ret = addr4_resolve(src_in, dst_in, addr, &rt);
591 ret = addr6_resolve(src_in, dst_in, addr, &dst);
597 ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
601 * Resolve neighbor destination address if requested and
602 * only if src addr translation didn't fail.
604 if (!ret && resolve_neigh)
605 ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
607 if (src_in->sa_family == AF_INET)
613 * Clear the addr net to go back to its original state, only if it was
614 * derived from GID attribute in this context.
616 if (resolve_by_gid_attr)
617 rdma_addr_set_net_defaults(addr);
621 static void process_one_req(struct work_struct *_work)
623 struct addr_req *req;
624 struct sockaddr *src_in, *dst_in;
626 req = container_of(_work, struct addr_req, work.work);
628 if (req->status == -ENODATA) {
629 src_in = (struct sockaddr *)&req->src_addr;
630 dst_in = (struct sockaddr *)&req->dst_addr;
631 req->status = addr_resolve(src_in, dst_in, req->addr,
632 true, req->resolve_by_gid_attr,
634 if (req->status && time_after_eq(jiffies, req->timeout)) {
635 req->status = -ETIMEDOUT;
636 } else if (req->status == -ENODATA) {
637 /* requeue the work for retrying again */
639 if (!list_empty(&req->list))
640 set_timeout(req, req->timeout);
641 spin_unlock_bh(&lock);
646 req->callback(req->status, (struct sockaddr *)&req->src_addr,
647 req->addr, req->context);
648 req->callback = NULL;
652 * Although the work will normally have been canceled by the workqueue,
653 * it can still be requeued as long as it is on the req_list.
655 cancel_delayed_work(&req->work);
656 if (!list_empty(&req->list)) {
657 list_del_init(&req->list);
660 spin_unlock_bh(&lock);
663 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
664 struct rdma_dev_addr *addr, unsigned long timeout_ms,
665 void (*callback)(int status, struct sockaddr *src_addr,
666 struct rdma_dev_addr *addr, void *context),
667 bool resolve_by_gid_attr, void *context)
669 struct sockaddr *src_in, *dst_in;
670 struct addr_req *req;
673 req = kzalloc(sizeof *req, GFP_KERNEL);
677 src_in = (struct sockaddr *) &req->src_addr;
678 dst_in = (struct sockaddr *) &req->dst_addr;
681 if (src_addr->sa_family != dst_addr->sa_family) {
686 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
688 src_in->sa_family = dst_addr->sa_family;
691 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
693 req->callback = callback;
694 req->context = context;
695 req->resolve_by_gid_attr = resolve_by_gid_attr;
696 INIT_DELAYED_WORK(&req->work, process_one_req);
697 req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
699 req->status = addr_resolve(src_in, dst_in, addr, true,
700 req->resolve_by_gid_attr, req->seq);
701 switch (req->status) {
703 req->timeout = jiffies;
707 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
719 EXPORT_SYMBOL(rdma_resolve_ip);
721 int roce_resolve_route_from_path(struct sa_path_rec *rec,
722 const struct ib_gid_attr *attr)
725 struct sockaddr _sockaddr;
726 struct sockaddr_in _sockaddr_in;
727 struct sockaddr_in6 _sockaddr_in6;
729 struct rdma_dev_addr dev_addr = {};
734 if (rec->roce.route_resolved)
737 rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
738 rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
740 if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
743 if (!attr || !attr->ndev)
746 dev_addr.net = &init_net;
747 dev_addr.sgid_attr = attr;
749 ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
750 &dev_addr, false, true, 0);
754 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
755 dev_addr.network == RDMA_NETWORK_IPV6) &&
756 rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
759 rec->roce.route_resolved = true;
764 * rdma_addr_cancel - Cancel resolve ip request
765 * @addr: Pointer to address structure given previously
766 * during rdma_resolve_ip().
767 * rdma_addr_cancel() is synchronous function which cancels any pending
768 * request if there is any.
770 void rdma_addr_cancel(struct rdma_dev_addr *addr)
772 struct addr_req *req, *temp_req;
773 struct addr_req *found = NULL;
776 list_for_each_entry_safe(req, temp_req, &req_list, list) {
777 if (req->addr == addr) {
779 * Removing from the list means we take ownership of
782 list_del_init(&req->list);
787 spin_unlock_bh(&lock);
793 * sync canceling the work after removing it from the req_list
794 * guarentees no work is running and none will be started.
796 cancel_delayed_work_sync(&found->work);
799 EXPORT_SYMBOL(rdma_addr_cancel);
801 struct resolve_cb_context {
802 struct completion comp;
806 static void resolve_cb(int status, struct sockaddr *src_addr,
807 struct rdma_dev_addr *addr, void *context)
809 ((struct resolve_cb_context *)context)->status = status;
810 complete(&((struct resolve_cb_context *)context)->comp);
813 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
814 const union ib_gid *dgid,
815 u8 *dmac, const struct ib_gid_attr *sgid_attr,
818 struct rdma_dev_addr dev_addr;
819 struct resolve_cb_context ctx;
821 struct sockaddr_in _sockaddr_in;
822 struct sockaddr_in6 _sockaddr_in6;
823 } sgid_addr, dgid_addr;
826 rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
827 rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
829 memset(&dev_addr, 0, sizeof(dev_addr));
830 dev_addr.net = &init_net;
831 dev_addr.sgid_attr = sgid_attr;
833 init_completion(&ctx.comp);
834 ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
835 (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
836 resolve_cb, true, &ctx);
840 wait_for_completion(&ctx.comp);
846 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
847 *hoplimit = dev_addr.hoplimit;
851 static int netevent_callback(struct notifier_block *self, unsigned long event,
854 struct addr_req *req;
856 if (event == NETEVENT_NEIGH_UPDATE) {
857 struct neighbour *neigh = ctx;
859 if (neigh->nud_state & NUD_VALID) {
861 list_for_each_entry(req, &req_list, list)
862 set_timeout(req, jiffies);
863 spin_unlock_bh(&lock);
869 static struct notifier_block nb = {
870 .notifier_call = netevent_callback
875 addr_wq = alloc_ordered_workqueue("ib_addr", 0);
879 register_netevent_notifier(&nb);
884 void addr_cleanup(void)
886 unregister_netevent_notifier(&nb);
887 destroy_workqueue(addr_wq);
888 WARN_ON(!list_empty(&req_list));