2 * Copyright (c) 2014 Red Hat, Inc.
4 * Based on mac-learning implementation.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
20 #include "mcast-snooping.h"
26 #include "byte-order.h"
30 #include "poll-loop.h"
33 #include "unaligned.h"
35 #include "vlan-bitmap.h"
36 #include "openvswitch/vlog.h"
38 COVERAGE_DEFINE(mcast_snooping_learned);
39 COVERAGE_DEFINE(mcast_snooping_expired);
41 static struct mcast_port_bundle *
42 mcast_snooping_port_lookup(struct ovs_list *list, void *port);
43 static struct mcast_mrouter_bundle *
44 mcast_snooping_mrouter_lookup(struct mcast_snooping *ms, uint16_t vlan,
46 OVS_REQ_RDLOCK(ms->rwlock);
49 mcast_snooping_enabled(const struct mcast_snooping *ms)
55 mcast_snooping_flood_unreg(const struct mcast_snooping *ms)
57 return ms->flood_unreg;
61 mcast_snooping_is_query(ovs_be16 igmp_type)
63 return igmp_type == htons(IGMP_HOST_MEMBERSHIP_QUERY);
67 mcast_snooping_is_membership(ovs_be16 igmp_type)
69 switch (ntohs(igmp_type)) {
70 case IGMP_HOST_MEMBERSHIP_REPORT:
71 case IGMPV2_HOST_MEMBERSHIP_REPORT:
72 case IGMPV3_HOST_MEMBERSHIP_REPORT:
73 case IGMP_HOST_LEAVE_MESSAGE:
79 /* Returns the number of seconds since multicast group 'b' was learned in a
82 mcast_bundle_age(const struct mcast_snooping *ms,
83 const struct mcast_group_bundle *b)
85 time_t remaining = b->expires - time_now();
86 return ms->idle_time - remaining;
90 mcast_table_hash(const struct mcast_snooping *ms,
91 const struct in6_addr *grp_addr, uint16_t vlan)
93 return hash_bytes(grp_addr->s6_addr, 16,
94 hash_2words(ms->secret, vlan));
97 static struct mcast_group_bundle *
98 mcast_group_bundle_from_lru_node(struct ovs_list *list)
100 return CONTAINER_OF(list, struct mcast_group_bundle, bundle_node);
103 static struct mcast_group *
104 mcast_group_from_lru_node(struct ovs_list *list)
106 return CONTAINER_OF(list, struct mcast_group, group_node);
109 /* Searches 'ms' for and returns an mcast group for destination address
110 * 'dip' in 'vlan'. */
112 mcast_snooping_lookup(const struct mcast_snooping *ms,
113 const struct in6_addr *dip, uint16_t vlan)
114 OVS_REQ_RDLOCK(ms->rwlock)
116 struct mcast_group *grp;
119 hash = mcast_table_hash(ms, dip, vlan);
120 HMAP_FOR_EACH_WITH_HASH (grp, hmap_node, hash, &ms->table) {
121 if (grp->vlan == vlan && ipv6_addr_equals(&grp->addr, dip)) {
129 mcast_snooping_lookup4(const struct mcast_snooping *ms, ovs_be32 ip4,
131 OVS_REQ_RDLOCK(ms->rwlock)
133 struct in6_addr addr;
134 in6_addr_set_mapped_ipv4(&addr, ip4);
135 return mcast_snooping_lookup(ms, &addr, vlan);
138 /* If the LRU list is not empty, stores the least-recently-used entry
139 * in '*e' and returns true. Otherwise, if the LRU list is empty,
140 * stores NULL in '*e' and return false. */
142 group_get_lru(const struct mcast_snooping *ms, struct mcast_group **grp)
143 OVS_REQ_RDLOCK(ms->rwlock)
145 if (!list_is_empty(&ms->group_lru)) {
146 *grp = mcast_group_from_lru_node(ms->group_lru.next);
155 normalize_idle_time(unsigned int idle_time)
157 return (idle_time < 15 ? 15
158 : idle_time > 3600 ? 3600
162 /* Creates and returns a new mcast table with an initial mcast aging
163 * timeout of MCAST_ENTRY_DEFAULT_IDLE_TIME seconds and an initial maximum of
164 * MCAST_DEFAULT_MAX entries. */
165 struct mcast_snooping *
166 mcast_snooping_create(void)
168 struct mcast_snooping *ms;
170 ms = xmalloc(sizeof *ms);
171 hmap_init(&ms->table);
172 list_init(&ms->group_lru);
173 list_init(&ms->mrouter_lru);
174 list_init(&ms->fport_list);
175 list_init(&ms->rport_list);
176 ms->secret = random_uint32();
177 ms->idle_time = MCAST_ENTRY_DEFAULT_IDLE_TIME;
178 ms->max_entries = MCAST_DEFAULT_MAX_ENTRIES;
179 ms->need_revalidate = false;
180 ms->flood_unreg = true;
181 ovs_refcount_init(&ms->ref_cnt);
182 ovs_rwlock_init(&ms->rwlock);
186 struct mcast_snooping *
187 mcast_snooping_ref(const struct mcast_snooping *ms_)
189 struct mcast_snooping *ms = CONST_CAST(struct mcast_snooping *, ms_);
191 ovs_refcount_ref(&ms->ref_cnt);
196 /* Unreferences (and possibly destroys) mcast snooping table 'ms'. */
198 mcast_snooping_unref(struct mcast_snooping *ms)
200 if (!mcast_snooping_enabled(ms)) {
204 if (ovs_refcount_unref_relaxed(&ms->ref_cnt) == 1) {
205 mcast_snooping_flush(ms);
206 hmap_destroy(&ms->table);
207 ovs_rwlock_destroy(&ms->rwlock);
212 /* Changes the mcast aging timeout of 'ms' to 'idle_time' seconds. */
214 mcast_snooping_set_idle_time(struct mcast_snooping *ms, unsigned int idle_time)
215 OVS_REQ_WRLOCK(ms->rwlock)
217 struct mcast_group *grp;
218 struct mcast_group_bundle *b;
221 idle_time = normalize_idle_time(idle_time);
222 if (idle_time != ms->idle_time) {
223 delta = (int) idle_time - (int) ms->idle_time;
224 LIST_FOR_EACH (grp, group_node, &ms->group_lru) {
225 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
229 ms->idle_time = idle_time;
233 /* Sets the maximum number of entries in 'ms' to 'max_entries', adjusting it
234 * to be within a reasonable range. */
236 mcast_snooping_set_max_entries(struct mcast_snooping *ms,
238 OVS_REQ_WRLOCK(ms->rwlock)
240 ms->max_entries = (max_entries < 10 ? 10
241 : max_entries > 1000 * 1000 ? 1000 * 1000
245 /* Sets if unregistered multicast packets should be flooded to
246 * all ports or only to ports connected to multicast routers
248 * Returns true if previous state differs from current state,
249 * false otherwise. */
251 mcast_snooping_set_flood_unreg(struct mcast_snooping *ms, bool enable)
252 OVS_REQ_WRLOCK(ms->rwlock)
254 bool prev = ms->flood_unreg;
255 ms->flood_unreg = enable;
256 return prev != enable;
259 static struct mcast_group_bundle *
260 mcast_group_bundle_lookup(struct mcast_snooping *ms OVS_UNUSED,
261 struct mcast_group *grp, void *port)
262 OVS_REQ_RDLOCK(ms->rwlock)
264 struct mcast_group_bundle *b;
266 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
267 if (b->port == port) {
274 /* Insert a new bundle to the mcast group or update its
275 * position and expiration if it is already there. */
276 static struct mcast_group_bundle *
277 mcast_group_insert_bundle(struct mcast_snooping *ms OVS_UNUSED,
278 struct mcast_group *grp, void *port, int idle_time)
279 OVS_REQ_WRLOCK(ms->rwlock)
281 struct mcast_group_bundle *b;
283 b = mcast_group_bundle_lookup(ms, grp, port);
285 list_remove(&b->bundle_node);
287 b = xmalloc(sizeof *b);
288 list_init(&b->bundle_node);
292 b->expires = time_now() + idle_time;
293 list_push_back(&grp->bundle_lru, &b->bundle_node);
297 /* Return true if multicast still has bundles associated.
298 * Return false if there is no bundles. */
300 mcast_group_has_bundles(struct mcast_group *grp)
302 return !list_is_empty(&grp->bundle_lru);
305 /* Delete 'grp' from the 'ms' hash table.
306 * Caller is responsible to clean bundle lru first. */
308 mcast_snooping_flush_group__(struct mcast_snooping *ms,
309 struct mcast_group *grp)
311 ovs_assert(list_is_empty(&grp->bundle_lru));
312 hmap_remove(&ms->table, &grp->hmap_node);
313 list_remove(&grp->group_node);
317 /* Flush out mcast group and its bundles */
319 mcast_snooping_flush_group(struct mcast_snooping *ms, struct mcast_group *grp)
320 OVS_REQ_WRLOCK(ms->rwlock)
322 struct mcast_group_bundle *b;
324 LIST_FOR_EACH_POP (b, bundle_node, &grp->bundle_lru) {
327 mcast_snooping_flush_group__(ms, grp);
328 ms->need_revalidate = true;
332 /* Delete bundle returning true if it succeeds,
333 * false if it didn't find the group. */
335 mcast_group_delete_bundle(struct mcast_snooping *ms OVS_UNUSED,
336 struct mcast_group *grp, void *port)
337 OVS_REQ_WRLOCK(ms->rwlock)
339 struct mcast_group_bundle *b;
341 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
342 if (b->port == port) {
343 list_remove(&b->bundle_node);
351 /* If any bundle has expired, delete it. Returns the number of deleted
354 mcast_snooping_prune_expired(struct mcast_snooping *ms,
355 struct mcast_group *grp)
356 OVS_REQ_WRLOCK(ms->rwlock)
359 struct mcast_group_bundle *b, *next_b;
360 time_t timenow = time_now();
363 LIST_FOR_EACH_SAFE (b, next_b, bundle_node, &grp->bundle_lru) {
364 /* This list is sorted on expiration time. */
365 if (b->expires > timenow) {
368 list_remove(&b->bundle_node);
373 if (!mcast_group_has_bundles(grp)) {
374 mcast_snooping_flush_group__(ms, grp);
379 ms->need_revalidate = true;
380 COVERAGE_ADD(mcast_snooping_expired, expired);
386 /* Add a multicast group to the mdb. If it exists, then
387 * move to the last position in the LRU list.
390 mcast_snooping_add_group(struct mcast_snooping *ms,
391 const struct in6_addr *addr,
392 uint16_t vlan, void *port)
393 OVS_REQ_WRLOCK(ms->rwlock)
396 struct mcast_group *grp;
398 /* Avoid duplicate packets. */
399 if (mcast_snooping_mrouter_lookup(ms, vlan, port)
400 || mcast_snooping_port_lookup(&ms->fport_list, port)) {
405 grp = mcast_snooping_lookup(ms, addr, vlan);
407 uint32_t hash = mcast_table_hash(ms, addr, vlan);
409 if (hmap_count(&ms->table) >= ms->max_entries) {
410 group_get_lru(ms, &grp);
411 mcast_snooping_flush_group(ms, grp);
414 grp = xmalloc(sizeof *grp);
415 hmap_insert(&ms->table, &grp->hmap_node, hash);
418 list_init(&grp->bundle_lru);
420 ms->need_revalidate = true;
421 COVERAGE_INC(mcast_snooping_learned);
423 list_remove(&grp->group_node);
425 mcast_group_insert_bundle(ms, grp, port, ms->idle_time);
427 /* Mark 'grp' as recently used. */
428 list_push_back(&ms->group_lru, &grp->group_node);
433 mcast_snooping_add_group4(struct mcast_snooping *ms, ovs_be32 ip4,
434 uint16_t vlan, void *port)
435 OVS_REQ_WRLOCK(ms->rwlock)
437 struct in6_addr addr;
438 in6_addr_set_mapped_ipv4(&addr, ip4);
439 return mcast_snooping_add_group(ms, &addr, vlan, port);
443 mcast_snooping_add_report(struct mcast_snooping *ms,
444 const struct dp_packet *p,
445 uint16_t vlan, void *port)
449 const struct igmpv3_header *igmpv3;
450 const struct igmpv3_record *record;
454 offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
455 igmpv3 = dp_packet_at(p, offset, IGMPV3_HEADER_LEN);
459 ngrp = ntohs(igmpv3->ngrp);
460 offset += IGMPV3_HEADER_LEN;
463 record = dp_packet_at(p, offset, sizeof(struct igmpv3_record));
467 /* Only consider known record types. */
468 if (record->type < IGMPV3_MODE_IS_INCLUDE
469 || record->type > IGMPV3_BLOCK_OLD_SOURCES) {
472 ip4 = get_16aligned_be32(&record->maddr);
474 * If record is INCLUDE MODE and there are no sources, it's equivalent
477 if (ntohs(record->nsrcs) == 0
478 && (record->type == IGMPV3_MODE_IS_INCLUDE
479 || record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
480 ret = mcast_snooping_leave_group4(ms, ip4, vlan, port);
482 ret = mcast_snooping_add_group4(ms, ip4, vlan, port);
487 offset += sizeof(*record)
488 + ntohs(record->nsrcs) * sizeof(ovs_be32) + record->aux_len;
494 mcast_snooping_add_mld(struct mcast_snooping *ms,
495 const struct dp_packet *p,
496 uint16_t vlan, void *port)
498 const struct in6_addr *addr;
500 const struct mld_header *mld;
501 const struct mld2_record *record;
506 offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
507 mld = dp_packet_at(p, offset, MLD_HEADER_LEN);
511 ngrp = ntohs(mld->ngrp);
512 offset += MLD_HEADER_LEN;
513 addr = dp_packet_at(p, offset, sizeof(struct in6_addr));
517 ret = mcast_snooping_add_group(ms, addr, vlan, port);
523 ret = mcast_snooping_leave_group(ms, addr, vlan, port);
530 record = dp_packet_at(p, offset, sizeof(struct mld2_record));
534 /* Only consider known record types. */
535 if (record->type >= IGMPV3_MODE_IS_INCLUDE
536 && record->type <= IGMPV3_BLOCK_OLD_SOURCES) {
537 struct in6_addr maddr;
538 memcpy(maddr.s6_addr, record->maddr.be16, 16);
541 * If record is INCLUDE MODE and there are no sources, it's
542 * equivalent to a LEAVE.
544 if (record->nsrcs == htons(0)
545 && (record->type == IGMPV3_MODE_IS_INCLUDE
546 || record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
547 ret = mcast_snooping_leave_group(ms, addr, vlan, port);
549 ret = mcast_snooping_add_group(ms, addr, vlan, port);
555 offset += sizeof(*record)
556 + ntohs(record->nsrcs) * sizeof(struct in6_addr)
565 mcast_snooping_leave_group(struct mcast_snooping *ms,
566 const struct in6_addr *addr,
567 uint16_t vlan, void *port)
568 OVS_REQ_WRLOCK(ms->rwlock)
570 struct mcast_group *grp;
572 /* Ports flagged to forward Reports usually have more
573 * than one host behind it, so don't leave the group
574 * on the first message and just let it expire */
575 if (mcast_snooping_port_lookup(&ms->rport_list, port)) {
579 grp = mcast_snooping_lookup(ms, addr, vlan);
580 if (grp && mcast_group_delete_bundle(ms, grp, port)) {
581 ms->need_revalidate = true;
588 mcast_snooping_leave_group4(struct mcast_snooping *ms, ovs_be32 ip4,
589 uint16_t vlan, void *port)
591 struct in6_addr addr;
592 in6_addr_set_mapped_ipv4(&addr, ip4);
593 return mcast_snooping_leave_group(ms, &addr, vlan, port);
599 /* Returns the number of seconds since the multicast router
600 * was learned in a port. */
602 mcast_mrouter_age(const struct mcast_snooping *ms OVS_UNUSED,
603 const struct mcast_mrouter_bundle *mrouter)
605 time_t remaining = mrouter->expires - time_now();
606 return MCAST_MROUTER_PORT_IDLE_TIME - remaining;
609 static struct mcast_mrouter_bundle *
610 mcast_mrouter_from_lru_node(struct ovs_list *list)
612 return CONTAINER_OF(list, struct mcast_mrouter_bundle, mrouter_node);
615 /* If the LRU list is not empty, stores the least-recently-used mrouter
616 * in '*m' and returns true. Otherwise, if the LRU list is empty,
617 * stores NULL in '*m' and return false. */
619 mrouter_get_lru(const struct mcast_snooping *ms,
620 struct mcast_mrouter_bundle **m)
621 OVS_REQ_RDLOCK(ms->rwlock)
623 if (!list_is_empty(&ms->mrouter_lru)) {
624 *m = mcast_mrouter_from_lru_node(ms->mrouter_lru.next);
632 static struct mcast_mrouter_bundle *
633 mcast_snooping_mrouter_lookup(struct mcast_snooping *ms, uint16_t vlan,
635 OVS_REQ_RDLOCK(ms->rwlock)
637 struct mcast_mrouter_bundle *mrouter;
639 LIST_FOR_EACH (mrouter, mrouter_node, &ms->mrouter_lru) {
640 if (mrouter->vlan == vlan && mrouter->port == port) {
648 mcast_snooping_add_mrouter(struct mcast_snooping *ms, uint16_t vlan,
650 OVS_REQ_WRLOCK(ms->rwlock)
652 struct mcast_mrouter_bundle *mrouter;
654 /* Avoid duplicate packets. */
655 if (mcast_snooping_port_lookup(&ms->fport_list, port)) {
659 mrouter = mcast_snooping_mrouter_lookup(ms, vlan, port);
661 list_remove(&mrouter->mrouter_node);
663 mrouter = xmalloc(sizeof *mrouter);
664 mrouter->vlan = vlan;
665 mrouter->port = port;
666 COVERAGE_INC(mcast_snooping_learned);
667 ms->need_revalidate = true;
670 mrouter->expires = time_now() + MCAST_MROUTER_PORT_IDLE_TIME;
671 list_push_back(&ms->mrouter_lru, &mrouter->mrouter_node);
672 return ms->need_revalidate;
676 mcast_snooping_flush_mrouter(struct mcast_mrouter_bundle *mrouter)
678 list_remove(&mrouter->mrouter_node);
684 static struct mcast_port_bundle *
685 mcast_port_from_list_node(struct ovs_list *list)
687 return CONTAINER_OF(list, struct mcast_port_bundle, node);
690 /* If the list is not empty, stores the fport in '*f' and returns true.
691 * Otherwise, if the list is empty, stores NULL in '*f' and return false. */
693 mcast_snooping_port_get(const struct ovs_list *list,
694 struct mcast_port_bundle **f)
696 if (!list_is_empty(list)) {
697 *f = mcast_port_from_list_node(list->next);
705 static struct mcast_port_bundle *
706 mcast_snooping_port_lookup(struct ovs_list *list, void *port)
708 struct mcast_port_bundle *pbundle;
710 LIST_FOR_EACH (pbundle, node, list) {
711 if (pbundle->port == port) {
719 mcast_snooping_add_port(struct ovs_list *list, void *port)
721 struct mcast_port_bundle *pbundle;
723 pbundle = xmalloc(sizeof *pbundle);
724 pbundle->port = port;
725 list_insert(list, &pbundle->node);
729 mcast_snooping_flush_port(struct mcast_port_bundle *pbundle)
731 list_remove(&pbundle->node);
738 mcast_snooping_set_port_flood(struct mcast_snooping *ms, void *port,
740 OVS_REQ_WRLOCK(ms->rwlock)
742 struct mcast_port_bundle *fbundle;
744 fbundle = mcast_snooping_port_lookup(&ms->fport_list, port);
745 if (flood && !fbundle) {
746 mcast_snooping_add_port(&ms->fport_list, port);
747 ms->need_revalidate = true;
748 } else if (!flood && fbundle) {
749 mcast_snooping_flush_port(fbundle);
750 ms->need_revalidate = true;
754 /* Flood Reports ports. */
757 mcast_snooping_set_port_flood_reports(struct mcast_snooping *ms, void *port,
759 OVS_REQ_WRLOCK(ms->rwlock)
761 struct mcast_port_bundle *pbundle;
763 pbundle = mcast_snooping_port_lookup(&ms->rport_list, port);
764 if (flood && !pbundle) {
765 mcast_snooping_add_port(&ms->rport_list, port);
766 ms->need_revalidate = true;
767 } else if (!flood && pbundle) {
768 mcast_snooping_flush_port(pbundle);
769 ms->need_revalidate = true;
776 mcast_snooping_mdb_flush__(struct mcast_snooping *ms)
777 OVS_REQ_WRLOCK(ms->rwlock)
779 struct mcast_group *grp;
780 struct mcast_mrouter_bundle *mrouter;
782 while (group_get_lru(ms, &grp)) {
783 mcast_snooping_flush_group(ms, grp);
786 hmap_shrink(&ms->table);
788 while (mrouter_get_lru(ms, &mrouter)) {
789 mcast_snooping_flush_mrouter(mrouter);
794 mcast_snooping_mdb_flush(struct mcast_snooping *ms)
796 if (!mcast_snooping_enabled(ms)) {
800 ovs_rwlock_wrlock(&ms->rwlock);
801 mcast_snooping_mdb_flush__(ms);
802 ovs_rwlock_unlock(&ms->rwlock);
805 /* Flushes mdb and flood ports. */
807 mcast_snooping_flush__(struct mcast_snooping *ms)
808 OVS_REQ_WRLOCK(ms->rwlock)
810 struct mcast_group *grp;
811 struct mcast_mrouter_bundle *mrouter;
812 struct mcast_port_bundle *pbundle;
814 while (group_get_lru(ms, &grp)) {
815 mcast_snooping_flush_group(ms, grp);
818 hmap_shrink(&ms->table);
820 /* flush multicast routers */
821 while (mrouter_get_lru(ms, &mrouter)) {
822 mcast_snooping_flush_mrouter(mrouter);
825 /* flush flood ports */
826 while (mcast_snooping_port_get(&ms->fport_list, &pbundle)) {
827 mcast_snooping_flush_port(pbundle);
830 /* flush flood report ports */
831 while (mcast_snooping_port_get(&ms->rport_list, &pbundle)) {
832 mcast_snooping_flush_port(pbundle);
837 mcast_snooping_flush(struct mcast_snooping *ms)
839 if (!mcast_snooping_enabled(ms)) {
843 ovs_rwlock_wrlock(&ms->rwlock);
844 mcast_snooping_flush__(ms);
845 ovs_rwlock_unlock(&ms->rwlock);
849 mcast_snooping_run__(struct mcast_snooping *ms)
850 OVS_REQ_WRLOCK(ms->rwlock)
852 bool need_revalidate;
853 struct mcast_group *grp;
854 struct mcast_mrouter_bundle *mrouter;
857 while (group_get_lru(ms, &grp)) {
858 if (hmap_count(&ms->table) > ms->max_entries) {
859 mcast_snooping_flush_group(ms, grp);
861 if (!mcast_snooping_prune_expired(ms, grp)) {
867 hmap_shrink(&ms->table);
870 while (mrouter_get_lru(ms, &mrouter)
871 && time_now() >= mrouter->expires) {
872 mcast_snooping_flush_mrouter(mrouter);
876 if (mrouter_expired) {
877 ms->need_revalidate = true;
878 COVERAGE_ADD(mcast_snooping_expired, mrouter_expired);
881 need_revalidate = ms->need_revalidate;
882 ms->need_revalidate = false;
883 return need_revalidate;
886 /* Does periodic work required by 'ms'. Returns true if something changed
887 * that may require flow revalidation. */
889 mcast_snooping_run(struct mcast_snooping *ms)
891 bool need_revalidate;
893 if (!mcast_snooping_enabled(ms)) {
897 ovs_rwlock_wrlock(&ms->rwlock);
898 need_revalidate = mcast_snooping_run__(ms);
899 ovs_rwlock_unlock(&ms->rwlock);
901 return need_revalidate;
905 mcast_snooping_wait__(struct mcast_snooping *ms)
906 OVS_REQ_RDLOCK(ms->rwlock)
908 if (hmap_count(&ms->table) > ms->max_entries
909 || ms->need_revalidate) {
910 poll_immediate_wake();
912 struct mcast_group *grp;
913 struct mcast_group_bundle *bundle;
914 struct mcast_mrouter_bundle *mrouter;
915 long long int mrouter_msec;
916 long long int msec = 0;
918 if (!list_is_empty(&ms->group_lru)) {
919 grp = mcast_group_from_lru_node(ms->group_lru.next);
920 bundle = mcast_group_bundle_from_lru_node(grp->bundle_lru.next);
921 msec = bundle->expires * 1000LL;
924 if (!list_is_empty(&ms->mrouter_lru)) {
925 mrouter = mcast_mrouter_from_lru_node(ms->mrouter_lru.next);
926 mrouter_msec = mrouter->expires * 1000LL;
927 msec = msec ? MIN(msec, mrouter_msec) : mrouter_msec;
931 poll_timer_wait_until(msec);
937 mcast_snooping_wait(struct mcast_snooping *ms)
939 if (!mcast_snooping_enabled(ms)) {
943 ovs_rwlock_rdlock(&ms->rwlock);
944 mcast_snooping_wait__(ms);
945 ovs_rwlock_unlock(&ms->rwlock);