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 = in6_addr_mapped_ipv4(ip4);
134 return mcast_snooping_lookup(ms, &addr, vlan);
137 /* If the LRU list is not empty, stores the least-recently-used entry
138 * in '*e' and returns true. Otherwise, if the LRU list is empty,
139 * stores NULL in '*e' and return false. */
141 group_get_lru(const struct mcast_snooping *ms, struct mcast_group **grp)
142 OVS_REQ_RDLOCK(ms->rwlock)
144 if (!list_is_empty(&ms->group_lru)) {
145 *grp = mcast_group_from_lru_node(ms->group_lru.next);
154 normalize_idle_time(unsigned int idle_time)
156 return (idle_time < 15 ? 15
157 : idle_time > 3600 ? 3600
161 /* Creates and returns a new mcast table with an initial mcast aging
162 * timeout of MCAST_ENTRY_DEFAULT_IDLE_TIME seconds and an initial maximum of
163 * MCAST_DEFAULT_MAX entries. */
164 struct mcast_snooping *
165 mcast_snooping_create(void)
167 struct mcast_snooping *ms;
169 ms = xmalloc(sizeof *ms);
170 hmap_init(&ms->table);
171 list_init(&ms->group_lru);
172 list_init(&ms->mrouter_lru);
173 list_init(&ms->fport_list);
174 list_init(&ms->rport_list);
175 ms->secret = random_uint32();
176 ms->idle_time = MCAST_ENTRY_DEFAULT_IDLE_TIME;
177 ms->max_entries = MCAST_DEFAULT_MAX_ENTRIES;
178 ms->need_revalidate = false;
179 ms->flood_unreg = true;
180 ovs_refcount_init(&ms->ref_cnt);
181 ovs_rwlock_init(&ms->rwlock);
185 struct mcast_snooping *
186 mcast_snooping_ref(const struct mcast_snooping *ms_)
188 struct mcast_snooping *ms = CONST_CAST(struct mcast_snooping *, ms_);
190 ovs_refcount_ref(&ms->ref_cnt);
195 /* Unreferences (and possibly destroys) mcast snooping table 'ms'. */
197 mcast_snooping_unref(struct mcast_snooping *ms)
199 if (!mcast_snooping_enabled(ms)) {
203 if (ovs_refcount_unref_relaxed(&ms->ref_cnt) == 1) {
204 mcast_snooping_flush(ms);
205 hmap_destroy(&ms->table);
206 ovs_rwlock_destroy(&ms->rwlock);
211 /* Changes the mcast aging timeout of 'ms' to 'idle_time' seconds. */
213 mcast_snooping_set_idle_time(struct mcast_snooping *ms, unsigned int idle_time)
214 OVS_REQ_WRLOCK(ms->rwlock)
216 struct mcast_group *grp;
217 struct mcast_group_bundle *b;
220 idle_time = normalize_idle_time(idle_time);
221 if (idle_time != ms->idle_time) {
222 delta = (int) idle_time - (int) ms->idle_time;
223 LIST_FOR_EACH (grp, group_node, &ms->group_lru) {
224 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
228 ms->idle_time = idle_time;
232 /* Sets the maximum number of entries in 'ms' to 'max_entries', adjusting it
233 * to be within a reasonable range. */
235 mcast_snooping_set_max_entries(struct mcast_snooping *ms,
237 OVS_REQ_WRLOCK(ms->rwlock)
239 ms->max_entries = (max_entries < 10 ? 10
240 : max_entries > 1000 * 1000 ? 1000 * 1000
244 /* Sets if unregistered multicast packets should be flooded to
245 * all ports or only to ports connected to multicast routers
247 * Returns true if previous state differs from current state,
248 * false otherwise. */
250 mcast_snooping_set_flood_unreg(struct mcast_snooping *ms, bool enable)
251 OVS_REQ_WRLOCK(ms->rwlock)
253 bool prev = ms->flood_unreg;
254 ms->flood_unreg = enable;
255 return prev != enable;
258 static struct mcast_group_bundle *
259 mcast_group_bundle_lookup(struct mcast_snooping *ms OVS_UNUSED,
260 struct mcast_group *grp, void *port)
261 OVS_REQ_RDLOCK(ms->rwlock)
263 struct mcast_group_bundle *b;
265 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
266 if (b->port == port) {
273 /* Insert a new bundle to the mcast group or update its
274 * position and expiration if it is already there. */
275 static struct mcast_group_bundle *
276 mcast_group_insert_bundle(struct mcast_snooping *ms OVS_UNUSED,
277 struct mcast_group *grp, void *port, int idle_time)
278 OVS_REQ_WRLOCK(ms->rwlock)
280 struct mcast_group_bundle *b;
282 b = mcast_group_bundle_lookup(ms, grp, port);
284 list_remove(&b->bundle_node);
286 b = xmalloc(sizeof *b);
287 list_init(&b->bundle_node);
291 b->expires = time_now() + idle_time;
292 list_push_back(&grp->bundle_lru, &b->bundle_node);
296 /* Return true if multicast still has bundles associated.
297 * Return false if there is no bundles. */
299 mcast_group_has_bundles(struct mcast_group *grp)
301 return !list_is_empty(&grp->bundle_lru);
304 /* Delete 'grp' from the 'ms' hash table.
305 * Caller is responsible to clean bundle lru first. */
307 mcast_snooping_flush_group__(struct mcast_snooping *ms,
308 struct mcast_group *grp)
310 ovs_assert(list_is_empty(&grp->bundle_lru));
311 hmap_remove(&ms->table, &grp->hmap_node);
312 list_remove(&grp->group_node);
316 /* Flush out mcast group and its bundles */
318 mcast_snooping_flush_group(struct mcast_snooping *ms, struct mcast_group *grp)
319 OVS_REQ_WRLOCK(ms->rwlock)
321 struct mcast_group_bundle *b;
323 LIST_FOR_EACH_POP (b, bundle_node, &grp->bundle_lru) {
326 mcast_snooping_flush_group__(ms, grp);
327 ms->need_revalidate = true;
331 /* Delete bundle returning true if it succeeds,
332 * false if it didn't find the group. */
334 mcast_group_delete_bundle(struct mcast_snooping *ms OVS_UNUSED,
335 struct mcast_group *grp, void *port)
336 OVS_REQ_WRLOCK(ms->rwlock)
338 struct mcast_group_bundle *b;
340 LIST_FOR_EACH (b, bundle_node, &grp->bundle_lru) {
341 if (b->port == port) {
342 list_remove(&b->bundle_node);
350 /* If any bundle has expired, delete it. Returns the number of deleted
353 mcast_snooping_prune_expired(struct mcast_snooping *ms,
354 struct mcast_group *grp)
355 OVS_REQ_WRLOCK(ms->rwlock)
358 struct mcast_group_bundle *b, *next_b;
359 time_t timenow = time_now();
362 LIST_FOR_EACH_SAFE (b, next_b, bundle_node, &grp->bundle_lru) {
363 /* This list is sorted on expiration time. */
364 if (b->expires > timenow) {
367 list_remove(&b->bundle_node);
372 if (!mcast_group_has_bundles(grp)) {
373 mcast_snooping_flush_group__(ms, grp);
378 ms->need_revalidate = true;
379 COVERAGE_ADD(mcast_snooping_expired, expired);
385 /* Add a multicast group to the mdb. If it exists, then
386 * move to the last position in the LRU list.
389 mcast_snooping_add_group(struct mcast_snooping *ms,
390 const struct in6_addr *addr,
391 uint16_t vlan, void *port)
392 OVS_REQ_WRLOCK(ms->rwlock)
395 struct mcast_group *grp;
397 /* Avoid duplicate packets. */
398 if (mcast_snooping_mrouter_lookup(ms, vlan, port)
399 || mcast_snooping_port_lookup(&ms->fport_list, port)) {
404 grp = mcast_snooping_lookup(ms, addr, vlan);
406 uint32_t hash = mcast_table_hash(ms, addr, vlan);
408 if (hmap_count(&ms->table) >= ms->max_entries) {
409 group_get_lru(ms, &grp);
410 mcast_snooping_flush_group(ms, grp);
413 grp = xmalloc(sizeof *grp);
414 hmap_insert(&ms->table, &grp->hmap_node, hash);
417 list_init(&grp->bundle_lru);
419 ms->need_revalidate = true;
420 COVERAGE_INC(mcast_snooping_learned);
422 list_remove(&grp->group_node);
424 mcast_group_insert_bundle(ms, grp, port, ms->idle_time);
426 /* Mark 'grp' as recently used. */
427 list_push_back(&ms->group_lru, &grp->group_node);
432 mcast_snooping_add_group4(struct mcast_snooping *ms, ovs_be32 ip4,
433 uint16_t vlan, void *port)
434 OVS_REQ_WRLOCK(ms->rwlock)
436 struct in6_addr addr = in6_addr_mapped_ipv4(ip4);
437 return mcast_snooping_add_group(ms, &addr, vlan, port);
441 mcast_snooping_add_report(struct mcast_snooping *ms,
442 const struct dp_packet *p,
443 uint16_t vlan, void *port)
447 const struct igmpv3_header *igmpv3;
448 const struct igmpv3_record *record;
452 offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
453 igmpv3 = dp_packet_at(p, offset, IGMPV3_HEADER_LEN);
457 ngrp = ntohs(igmpv3->ngrp);
458 offset += IGMPV3_HEADER_LEN;
461 record = dp_packet_at(p, offset, sizeof(struct igmpv3_record));
465 /* Only consider known record types. */
466 if (record->type < IGMPV3_MODE_IS_INCLUDE
467 || record->type > IGMPV3_BLOCK_OLD_SOURCES) {
470 ip4 = get_16aligned_be32(&record->maddr);
472 * If record is INCLUDE MODE and there are no sources, it's equivalent
475 if (ntohs(record->nsrcs) == 0
476 && (record->type == IGMPV3_MODE_IS_INCLUDE
477 || record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
478 ret = mcast_snooping_leave_group4(ms, ip4, vlan, port);
480 ret = mcast_snooping_add_group4(ms, ip4, vlan, port);
485 offset += sizeof(*record)
486 + ntohs(record->nsrcs) * sizeof(ovs_be32) + record->aux_len;
492 mcast_snooping_add_mld(struct mcast_snooping *ms,
493 const struct dp_packet *p,
494 uint16_t vlan, void *port)
496 const struct in6_addr *addr;
498 const struct mld_header *mld;
499 const struct mld2_record *record;
504 offset = (char *) dp_packet_l4(p) - (char *) dp_packet_data(p);
505 mld = dp_packet_at(p, offset, MLD_HEADER_LEN);
509 ngrp = ntohs(mld->ngrp);
510 offset += MLD_HEADER_LEN;
511 addr = dp_packet_at(p, offset, sizeof(struct in6_addr));
515 ret = mcast_snooping_add_group(ms, addr, vlan, port);
521 ret = mcast_snooping_leave_group(ms, addr, vlan, port);
528 record = dp_packet_at(p, offset, sizeof(struct mld2_record));
532 /* Only consider known record types. */
533 if (record->type >= IGMPV3_MODE_IS_INCLUDE
534 && record->type <= IGMPV3_BLOCK_OLD_SOURCES) {
535 struct in6_addr maddr;
536 memcpy(maddr.s6_addr, record->maddr.be16, 16);
539 * If record is INCLUDE MODE and there are no sources, it's
540 * equivalent to a LEAVE.
542 if (record->nsrcs == htons(0)
543 && (record->type == IGMPV3_MODE_IS_INCLUDE
544 || record->type == IGMPV3_CHANGE_TO_INCLUDE_MODE)) {
545 ret = mcast_snooping_leave_group(ms, addr, vlan, port);
547 ret = mcast_snooping_add_group(ms, addr, vlan, port);
553 offset += sizeof(*record)
554 + ntohs(record->nsrcs) * sizeof(struct in6_addr)
563 mcast_snooping_leave_group(struct mcast_snooping *ms,
564 const struct in6_addr *addr,
565 uint16_t vlan, void *port)
566 OVS_REQ_WRLOCK(ms->rwlock)
568 struct mcast_group *grp;
570 /* Ports flagged to forward Reports usually have more
571 * than one host behind it, so don't leave the group
572 * on the first message and just let it expire */
573 if (mcast_snooping_port_lookup(&ms->rport_list, port)) {
577 grp = mcast_snooping_lookup(ms, addr, vlan);
578 if (grp && mcast_group_delete_bundle(ms, grp, port)) {
579 ms->need_revalidate = true;
586 mcast_snooping_leave_group4(struct mcast_snooping *ms, ovs_be32 ip4,
587 uint16_t vlan, void *port)
589 struct in6_addr addr = in6_addr_mapped_ipv4(ip4);
590 return mcast_snooping_leave_group(ms, &addr, vlan, port);
596 /* Returns the number of seconds since the multicast router
597 * was learned in a port. */
599 mcast_mrouter_age(const struct mcast_snooping *ms OVS_UNUSED,
600 const struct mcast_mrouter_bundle *mrouter)
602 time_t remaining = mrouter->expires - time_now();
603 return MCAST_MROUTER_PORT_IDLE_TIME - remaining;
606 static struct mcast_mrouter_bundle *
607 mcast_mrouter_from_lru_node(struct ovs_list *list)
609 return CONTAINER_OF(list, struct mcast_mrouter_bundle, mrouter_node);
612 /* If the LRU list is not empty, stores the least-recently-used mrouter
613 * in '*m' and returns true. Otherwise, if the LRU list is empty,
614 * stores NULL in '*m' and return false. */
616 mrouter_get_lru(const struct mcast_snooping *ms,
617 struct mcast_mrouter_bundle **m)
618 OVS_REQ_RDLOCK(ms->rwlock)
620 if (!list_is_empty(&ms->mrouter_lru)) {
621 *m = mcast_mrouter_from_lru_node(ms->mrouter_lru.next);
629 static struct mcast_mrouter_bundle *
630 mcast_snooping_mrouter_lookup(struct mcast_snooping *ms, uint16_t vlan,
632 OVS_REQ_RDLOCK(ms->rwlock)
634 struct mcast_mrouter_bundle *mrouter;
636 LIST_FOR_EACH (mrouter, mrouter_node, &ms->mrouter_lru) {
637 if (mrouter->vlan == vlan && mrouter->port == port) {
645 mcast_snooping_add_mrouter(struct mcast_snooping *ms, uint16_t vlan,
647 OVS_REQ_WRLOCK(ms->rwlock)
649 struct mcast_mrouter_bundle *mrouter;
651 /* Avoid duplicate packets. */
652 if (mcast_snooping_port_lookup(&ms->fport_list, port)) {
656 mrouter = mcast_snooping_mrouter_lookup(ms, vlan, port);
658 list_remove(&mrouter->mrouter_node);
660 mrouter = xmalloc(sizeof *mrouter);
661 mrouter->vlan = vlan;
662 mrouter->port = port;
663 COVERAGE_INC(mcast_snooping_learned);
664 ms->need_revalidate = true;
667 mrouter->expires = time_now() + MCAST_MROUTER_PORT_IDLE_TIME;
668 list_push_back(&ms->mrouter_lru, &mrouter->mrouter_node);
669 return ms->need_revalidate;
673 mcast_snooping_flush_mrouter(struct mcast_mrouter_bundle *mrouter)
675 list_remove(&mrouter->mrouter_node);
681 static struct mcast_port_bundle *
682 mcast_port_from_list_node(struct ovs_list *list)
684 return CONTAINER_OF(list, struct mcast_port_bundle, node);
687 /* If the list is not empty, stores the fport in '*f' and returns true.
688 * Otherwise, if the list is empty, stores NULL in '*f' and return false. */
690 mcast_snooping_port_get(const struct ovs_list *list,
691 struct mcast_port_bundle **f)
693 if (!list_is_empty(list)) {
694 *f = mcast_port_from_list_node(list->next);
702 static struct mcast_port_bundle *
703 mcast_snooping_port_lookup(struct ovs_list *list, void *port)
705 struct mcast_port_bundle *pbundle;
707 LIST_FOR_EACH (pbundle, node, list) {
708 if (pbundle->port == port) {
716 mcast_snooping_add_port(struct ovs_list *list, void *port)
718 struct mcast_port_bundle *pbundle;
720 pbundle = xmalloc(sizeof *pbundle);
721 pbundle->port = port;
722 list_insert(list, &pbundle->node);
726 mcast_snooping_flush_port(struct mcast_port_bundle *pbundle)
728 list_remove(&pbundle->node);
735 mcast_snooping_set_port_flood(struct mcast_snooping *ms, void *port,
737 OVS_REQ_WRLOCK(ms->rwlock)
739 struct mcast_port_bundle *fbundle;
741 fbundle = mcast_snooping_port_lookup(&ms->fport_list, port);
742 if (flood && !fbundle) {
743 mcast_snooping_add_port(&ms->fport_list, port);
744 ms->need_revalidate = true;
745 } else if (!flood && fbundle) {
746 mcast_snooping_flush_port(fbundle);
747 ms->need_revalidate = true;
751 /* Flood Reports ports. */
754 mcast_snooping_set_port_flood_reports(struct mcast_snooping *ms, void *port,
756 OVS_REQ_WRLOCK(ms->rwlock)
758 struct mcast_port_bundle *pbundle;
760 pbundle = mcast_snooping_port_lookup(&ms->rport_list, port);
761 if (flood && !pbundle) {
762 mcast_snooping_add_port(&ms->rport_list, port);
763 ms->need_revalidate = true;
764 } else if (!flood && pbundle) {
765 mcast_snooping_flush_port(pbundle);
766 ms->need_revalidate = true;
773 mcast_snooping_mdb_flush__(struct mcast_snooping *ms)
774 OVS_REQ_WRLOCK(ms->rwlock)
776 struct mcast_group *grp;
777 struct mcast_mrouter_bundle *mrouter;
779 while (group_get_lru(ms, &grp)) {
780 mcast_snooping_flush_group(ms, grp);
783 hmap_shrink(&ms->table);
785 while (mrouter_get_lru(ms, &mrouter)) {
786 mcast_snooping_flush_mrouter(mrouter);
791 mcast_snooping_mdb_flush(struct mcast_snooping *ms)
793 if (!mcast_snooping_enabled(ms)) {
797 ovs_rwlock_wrlock(&ms->rwlock);
798 mcast_snooping_mdb_flush__(ms);
799 ovs_rwlock_unlock(&ms->rwlock);
802 /* Flushes mdb and flood ports. */
804 mcast_snooping_flush__(struct mcast_snooping *ms)
805 OVS_REQ_WRLOCK(ms->rwlock)
807 struct mcast_group *grp;
808 struct mcast_mrouter_bundle *mrouter;
809 struct mcast_port_bundle *pbundle;
811 while (group_get_lru(ms, &grp)) {
812 mcast_snooping_flush_group(ms, grp);
815 hmap_shrink(&ms->table);
817 /* flush multicast routers */
818 while (mrouter_get_lru(ms, &mrouter)) {
819 mcast_snooping_flush_mrouter(mrouter);
822 /* flush flood ports */
823 while (mcast_snooping_port_get(&ms->fport_list, &pbundle)) {
824 mcast_snooping_flush_port(pbundle);
827 /* flush flood report ports */
828 while (mcast_snooping_port_get(&ms->rport_list, &pbundle)) {
829 mcast_snooping_flush_port(pbundle);
834 mcast_snooping_flush(struct mcast_snooping *ms)
836 if (!mcast_snooping_enabled(ms)) {
840 ovs_rwlock_wrlock(&ms->rwlock);
841 mcast_snooping_flush__(ms);
842 ovs_rwlock_unlock(&ms->rwlock);
846 mcast_snooping_run__(struct mcast_snooping *ms)
847 OVS_REQ_WRLOCK(ms->rwlock)
849 bool need_revalidate;
850 struct mcast_group *grp;
851 struct mcast_mrouter_bundle *mrouter;
854 while (group_get_lru(ms, &grp)) {
855 if (hmap_count(&ms->table) > ms->max_entries) {
856 mcast_snooping_flush_group(ms, grp);
858 if (!mcast_snooping_prune_expired(ms, grp)) {
864 hmap_shrink(&ms->table);
867 while (mrouter_get_lru(ms, &mrouter)
868 && time_now() >= mrouter->expires) {
869 mcast_snooping_flush_mrouter(mrouter);
873 if (mrouter_expired) {
874 ms->need_revalidate = true;
875 COVERAGE_ADD(mcast_snooping_expired, mrouter_expired);
878 need_revalidate = ms->need_revalidate;
879 ms->need_revalidate = false;
880 return need_revalidate;
883 /* Does periodic work required by 'ms'. Returns true if something changed
884 * that may require flow revalidation. */
886 mcast_snooping_run(struct mcast_snooping *ms)
888 bool need_revalidate;
890 if (!mcast_snooping_enabled(ms)) {
894 ovs_rwlock_wrlock(&ms->rwlock);
895 need_revalidate = mcast_snooping_run__(ms);
896 ovs_rwlock_unlock(&ms->rwlock);
898 return need_revalidate;
902 mcast_snooping_wait__(struct mcast_snooping *ms)
903 OVS_REQ_RDLOCK(ms->rwlock)
905 if (hmap_count(&ms->table) > ms->max_entries
906 || ms->need_revalidate) {
907 poll_immediate_wake();
909 struct mcast_group *grp;
910 struct mcast_group_bundle *bundle;
911 struct mcast_mrouter_bundle *mrouter;
912 long long int mrouter_msec;
913 long long int msec = 0;
915 if (!list_is_empty(&ms->group_lru)) {
916 grp = mcast_group_from_lru_node(ms->group_lru.next);
917 bundle = mcast_group_bundle_from_lru_node(grp->bundle_lru.next);
918 msec = bundle->expires * 1000LL;
921 if (!list_is_empty(&ms->mrouter_lru)) {
922 mrouter = mcast_mrouter_from_lru_node(ms->mrouter_lru.next);
923 mrouter_msec = mrouter->expires * 1000LL;
924 msec = msec ? MIN(msec, mrouter_msec) : mrouter_msec;
928 poll_timer_wait_until(msec);
934 mcast_snooping_wait(struct mcast_snooping *ms)
936 if (!mcast_snooping_enabled(ms)) {
940 ovs_rwlock_rdlock(&ms->rwlock);
941 mcast_snooping_wait__(ms);
942 ovs_rwlock_unlock(&ms->rwlock);