2 * Copyright (c) 2010, 2011, 2012, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
24 #include "byte-order.h"
25 #include "dynamic-string.h"
32 #include "poll-loop.h"
39 VLOG_DEFINE_THIS_MODULE(cfm);
41 #define CFM_MAX_RMPS 256
43 /* Ethernet destination address of CCM packets. */
44 static const uint8_t eth_addr_ccm[6] = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
45 static const uint8_t eth_addr_ccm_x[6] = {
46 0x01, 0x23, 0x20, 0x00, 0x00, 0x30
49 #define ETH_TYPE_CFM 0x8902
51 /* A 'ccm' represents a Continuity Check Message from the 802.1ag
52 * specification. Continuity Check Messages are broadcast periodically so that
53 * hosts can determine whom they have connectivity to.
55 * The minimum length of a CCM as specified by IEEE 802.1ag is 75 bytes.
56 * Previous versions of Open vSwitch generated 74-byte CCM messages, so we
57 * accept such messages too. */
59 #define CCM_ACCEPT_LEN 74
60 #define CCM_MAID_LEN 48
61 #define CCM_OPCODE 1 /* CFM message opcode meaning CCM. */
62 #define CCM_RDI_MASK 0x80
63 #define CFM_HEALTH_INTERVAL 6
67 uint8_t mdlevel_version; /* MD Level and Version */
73 uint8_t maid[CCM_MAID_LEN];
75 /* Defined by ITU-T Y.1731 should be zero */
76 ovs_be16 interval_ms_x; /* Transmission interval in ms. */
77 ovs_be64 mpid64; /* MPID in extended mode. */
78 uint8_t opdown; /* Operationally down. */
84 BUILD_ASSERT_DECL(CCM_LEN == sizeof(struct ccm));
87 const char *name; /* Name of this CFM object. */
88 struct hmap_node hmap_node; /* Node in all_cfms list. */
90 struct netdev *netdev;
91 uint64_t rx_packets; /* Packets received by 'netdev'. */
94 bool demand; /* Demand mode. */
95 bool booted; /* A full fault interval has occurred. */
96 enum cfm_fault_reason fault; /* Connectivity fault status. */
97 enum cfm_fault_reason recv_fault; /* Bit mask of faults occurring on
99 bool opup; /* Operational State. */
100 bool remote_opup; /* Remote Operational State. */
102 int fault_override; /* Manual override of 'fault' status.
103 Ignored if negative. */
105 uint32_t seq; /* The sequence number of our last CCM. */
106 uint8_t ccm_interval; /* The CCM transmission interval. */
107 int ccm_interval_ms; /* 'ccm_interval' in milliseconds. */
108 uint16_t ccm_vlan; /* Vlan tag of CCM PDUs. CFM_RANDOM_VLAN if
110 uint8_t ccm_pcp; /* Priority of CCM PDUs. */
111 uint8_t maid[CCM_MAID_LEN]; /* The MAID of this CFM. */
113 struct timer tx_timer; /* Send CCM when expired. */
114 struct timer fault_timer; /* Check for faults when expired. */
116 struct hmap remote_mps; /* Remote MPs. */
118 /* Result of cfm_get_remote_mpids(). Updated only during fault check to
120 uint64_t *rmps_array; /* Cache of remote_mps. */
121 size_t rmps_array_len; /* Number of rmps in 'rmps_array'. */
123 int health; /* Percentage of the number of CCM frames
125 int health_interval; /* Number of fault_intervals since health was
127 long long int last_tx; /* Last CCM transmission time. */
129 atomic_bool check_tnl_key; /* Verify the tunnel key of inbound packets? */
130 atomic_bool extended; /* Extended mode. */
134 /* Remote MPs represent foreign network entities that are configured to have
135 * the same MAID as this CFM instance. */
137 uint64_t mpid; /* The Maintenance Point ID of this 'remote_mp'. */
138 struct hmap_node node; /* Node in 'remote_mps' map. */
140 bool recv; /* CCM was received since last fault check. */
141 bool opup; /* Operational State. */
142 uint32_t seq; /* Most recently received sequence number. */
143 uint8_t num_health_ccm; /* Number of received ccm frames every
144 CFM_HEALTH_INTERVAL * 'fault_interval'. */
145 long long int last_rx; /* Last CCM reception time. */
149 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(20, 30);
151 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
152 static struct hmap all_cfms__ = HMAP_INITIALIZER(&all_cfms__);
153 static struct hmap *const all_cfms OVS_GUARDED_BY(mutex) = &all_cfms__;
155 static unixctl_cb_func cfm_unixctl_show;
156 static unixctl_cb_func cfm_unixctl_set_fault;
159 cfm_rx_packets(const struct cfm *cfm) OVS_REQUIRES(mutex)
161 struct netdev_stats stats;
163 if (!netdev_get_stats(cfm->netdev, &stats)) {
164 return stats.rx_packets;
170 static const uint8_t *
171 cfm_ccm_addr(struct cfm *cfm)
174 atomic_read(&cfm->extended, &extended);
175 return extended ? eth_addr_ccm_x : eth_addr_ccm;
178 /* Returns the string representation of the given cfm_fault_reason 'reason'. */
180 cfm_fault_reason_to_str(int reason)
183 #define CFM_FAULT_REASON(NAME, STR) case CFM_FAULT_##NAME: return #STR;
185 #undef CFM_FAULT_REASON
186 default: return "<unknown>";
191 ds_put_cfm_fault(struct ds *ds, int fault)
195 for (i = 0; i < CFM_FAULT_N_REASONS; i++) {
198 if (fault & reason) {
199 ds_put_format(ds, "%s ", cfm_fault_reason_to_str(reason));
207 cfm_generate_maid(struct cfm *cfm) OVS_REQUIRES(mutex)
209 const char *ovs_md_name = "ovs";
210 const char *ovs_ma_name = "ovs";
212 size_t md_len, ma_len;
214 memset(cfm->maid, 0, CCM_MAID_LEN);
216 md_len = strlen(ovs_md_name);
217 ma_len = strlen(ovs_ma_name);
219 ovs_assert(md_len && ma_len && md_len + ma_len + 4 <= CCM_MAID_LEN);
221 cfm->maid[0] = 4; /* MD name string format. */
222 cfm->maid[1] = md_len; /* MD name size. */
223 memcpy(&cfm->maid[2], ovs_md_name, md_len); /* MD name. */
225 ma_p = cfm->maid + 2 + md_len;
226 ma_p[0] = 2; /* MA name string format. */
227 ma_p[1] = ma_len; /* MA name size. */
228 memcpy(&ma_p[2], ovs_ma_name, ma_len); /* MA name. */
232 ccm_interval_to_ms(uint8_t interval)
235 case 0: NOT_REACHED(); /* Explicitly not supported by 802.1ag. */
236 case 1: return 3; /* Not recommended due to timer resolution. */
237 case 2: return 10; /* Not recommended due to timer resolution. */
240 case 5: return 10000;
241 case 6: return 60000;
242 case 7: return 600000;
243 default: NOT_REACHED(); /* Explicitly not supported by 802.1ag. */
250 cfm_fault_interval(struct cfm *cfm) OVS_REQUIRES(mutex)
252 /* According to the 802.1ag specification we should assume every other MP
253 * with the same MAID has the same transmission interval that we have. If
254 * an MP has a different interval, cfm_process_heartbeat will register it
255 * as a fault (likely due to a configuration error). Thus we can check all
256 * MPs at once making this quite a bit simpler.
258 * When cfm is not in demand mode, we check when (ccm_interval_ms * 3.5) ms
259 * have passed. When cfm is in demand mode, we check when
260 * (MAX(ccm_interval_ms, 500) * 3.5) ms have passed. This ensures that
261 * ovs-vswitchd has enough time to pull statistics from the datapath. */
263 return (MAX(cfm->ccm_interval_ms, cfm->demand ? 500 : cfm->ccm_interval_ms)
268 ms_to_ccm_interval(int interval_ms)
272 for (i = 7; i > 0; i--) {
273 if (ccm_interval_to_ms(i) <= interval_ms) {
282 hash_mpid(uint64_t mpid)
284 return hash_bytes(&mpid, sizeof mpid, 0);
288 cfm_is_valid_mpid(bool extended, uint64_t mpid)
290 /* 802.1ag specification requires MPIDs to be within the range [1, 8191].
291 * In extended mode we relax this requirement. */
292 return mpid >= 1 && (extended || mpid <= 8191);
295 static struct remote_mp *
296 lookup_remote_mp(const struct cfm *cfm, uint64_t mpid) OVS_REQUIRES(mutex)
298 struct remote_mp *rmp;
300 HMAP_FOR_EACH_IN_BUCKET (rmp, node, hash_mpid(mpid), &cfm->remote_mps) {
301 if (rmp->mpid == mpid) {
312 unixctl_command_register("cfm/show", "[interface]", 0, 1, cfm_unixctl_show,
314 unixctl_command_register("cfm/set-fault", "[interface] normal|false|true",
315 1, 2, cfm_unixctl_set_fault, NULL);
318 /* Allocates a 'cfm' object called 'name'. 'cfm' should be initialized by
319 * cfm_configure() before use. */
321 cfm_create(const struct netdev *netdev) OVS_EXCLUDED(mutex)
325 cfm = xzalloc(sizeof *cfm);
326 cfm->netdev = netdev_ref(netdev);
327 cfm->name = netdev_get_name(cfm->netdev);
328 hmap_init(&cfm->remote_mps);
329 cfm->remote_opup = true;
330 cfm->fault_override = -1;
333 atomic_init(&cfm->extended, false);
334 atomic_init(&cfm->check_tnl_key, false);
335 atomic_init(&cfm->ref_cnt, 1);
337 ovs_mutex_lock(&mutex);
338 cfm_generate_maid(cfm);
339 hmap_insert(all_cfms, &cfm->hmap_node, hash_string(cfm->name, 0));
340 ovs_mutex_unlock(&mutex);
345 cfm_unref(struct cfm *cfm) OVS_EXCLUDED(mutex)
347 struct remote_mp *rmp, *rmp_next;
354 atomic_sub(&cfm->ref_cnt, 1, &orig);
355 ovs_assert(orig > 0);
360 ovs_mutex_lock(&mutex);
361 hmap_remove(all_cfms, &cfm->hmap_node);
362 ovs_mutex_unlock(&mutex);
364 HMAP_FOR_EACH_SAFE (rmp, rmp_next, node, &cfm->remote_mps) {
365 hmap_remove(&cfm->remote_mps, &rmp->node);
369 hmap_destroy(&cfm->remote_mps);
370 netdev_close(cfm->netdev);
371 free(cfm->rmps_array);
376 cfm_ref(const struct cfm *cfm_)
378 struct cfm *cfm = CONST_CAST(struct cfm *, cfm_);
381 atomic_add(&cfm->ref_cnt, 1, &orig);
382 ovs_assert(orig > 0);
387 /* Should be run periodically to update fault statistics messages. */
389 cfm_run(struct cfm *cfm) OVS_EXCLUDED(mutex)
391 ovs_mutex_lock(&mutex);
392 if (timer_expired(&cfm->fault_timer)) {
393 long long int interval = cfm_fault_interval(cfm);
394 struct remote_mp *rmp, *rmp_next;
395 bool old_cfm_fault = cfm->fault;
396 bool demand_override;
397 bool rmp_set_opup = false;
398 bool rmp_set_opdown = false;
400 cfm->fault = cfm->recv_fault;
403 cfm->rmps_array_len = 0;
404 free(cfm->rmps_array);
405 cfm->rmps_array = xmalloc(hmap_count(&cfm->remote_mps) *
406 sizeof *cfm->rmps_array);
408 if (cfm->health_interval == CFM_HEALTH_INTERVAL) {
409 /* Calculate the cfm health of the interface. If the number of
410 * remote_mpids of a cfm interface is > 1, the cfm health is
411 * undefined. If the number of remote_mpids is 1, the cfm health is
412 * the percentage of the ccm frames received in the
413 * (CFM_HEALTH_INTERVAL * 3.5)ms, else it is 0. */
414 if (hmap_count(&cfm->remote_mps) > 1) {
416 } else if (hmap_is_empty(&cfm->remote_mps)) {
421 rmp = CONTAINER_OF(hmap_first(&cfm->remote_mps),
422 struct remote_mp, node);
423 exp_ccm_recvd = (CFM_HEALTH_INTERVAL * 7) / 2;
424 /* Calculate the percentage of healthy ccm frames received.
425 * Since the 'fault_interval' is (3.5 * cfm_interval), and
426 * 1 CCM packet must be received every cfm_interval,
427 * the 'remote_mpid' health reports the percentage of
428 * healthy CCM frames received every
429 * 'CFM_HEALTH_INTERVAL'th 'fault_interval'. */
430 cfm->health = (rmp->num_health_ccm * 100) / exp_ccm_recvd;
431 cfm->health = MIN(cfm->health, 100);
432 rmp->num_health_ccm = 0;
433 ovs_assert(cfm->health >= 0 && cfm->health <= 100);
435 cfm->health_interval = 0;
437 cfm->health_interval++;
439 demand_override = false;
441 uint64_t rx_packets = cfm_rx_packets(cfm);
442 demand_override = hmap_count(&cfm->remote_mps) == 1
443 && rx_packets > cfm->rx_packets;
444 cfm->rx_packets = rx_packets;
447 HMAP_FOR_EACH_SAFE (rmp, rmp_next, node, &cfm->remote_mps) {
449 VLOG_INFO("%s: Received no CCM from RMP %"PRIu64" in the last"
450 " %lldms", cfm->name, rmp->mpid,
451 time_msec() - rmp->last_rx);
452 if (!demand_override) {
453 hmap_remove(&cfm->remote_mps, &rmp->node);
462 rmp_set_opdown = true;
465 cfm->rmps_array[cfm->rmps_array_len++] = rmp->mpid;
469 if (rmp_set_opdown) {
470 cfm->remote_opup = false;
472 else if (rmp_set_opup) {
473 cfm->remote_opup = true;
476 if (hmap_is_empty(&cfm->remote_mps)) {
477 cfm->fault |= CFM_FAULT_RECV;
480 if (old_cfm_fault != cfm->fault && !VLOG_DROP_INFO(&rl)) {
481 struct ds ds = DS_EMPTY_INITIALIZER;
483 ds_put_cstr(&ds, "from [");
484 ds_put_cfm_fault(&ds, old_cfm_fault);
485 ds_put_cstr(&ds, "] to [");
486 ds_put_cfm_fault(&ds, cfm->fault);
487 ds_put_char(&ds, ']');
488 VLOG_INFO("%s: CFM faults changed %s.", cfm->name, ds_cstr(&ds));
493 timer_set_duration(&cfm->fault_timer, interval);
494 VLOG_DBG("%s: new fault interval", cfm->name);
496 ovs_mutex_unlock(&mutex);
499 /* Should be run periodically to check if the CFM module has a CCM message it
502 cfm_should_send_ccm(struct cfm *cfm) OVS_EXCLUDED(mutex)
506 ovs_mutex_lock(&mutex);
507 ret = timer_expired(&cfm->tx_timer);
508 ovs_mutex_unlock(&mutex);
512 /* Composes a CCM message into 'packet'. Messages generated with this function
513 * should be sent whenever cfm_should_send_ccm() indicates. */
515 cfm_compose_ccm(struct cfm *cfm, struct ofpbuf *packet,
516 uint8_t eth_src[ETH_ADDR_LEN]) OVS_EXCLUDED(mutex)
522 ovs_mutex_lock(&mutex);
523 timer_set_duration(&cfm->tx_timer, cfm->ccm_interval_ms);
524 eth_compose(packet, cfm_ccm_addr(cfm), eth_src, ETH_TYPE_CFM, sizeof *ccm);
526 ccm_vlan = (cfm->ccm_vlan != CFM_RANDOM_VLAN
529 ccm_vlan = ccm_vlan & VLAN_VID_MASK;
531 if (ccm_vlan || cfm->ccm_pcp) {
532 uint16_t tci = ccm_vlan | (cfm->ccm_pcp << VLAN_PCP_SHIFT);
533 eth_push_vlan(packet, htons(tci));
537 ccm->mdlevel_version = 0;
538 ccm->opcode = CCM_OPCODE;
539 ccm->tlv_offset = 70;
540 ccm->seq = htonl(++cfm->seq);
541 ccm->flags = cfm->ccm_interval;
542 memcpy(ccm->maid, cfm->maid, sizeof ccm->maid);
543 memset(ccm->zero, 0, sizeof ccm->zero);
546 atomic_read(&cfm->extended, &extended);
548 ccm->mpid = htons(hash_mpid(cfm->mpid));
549 ccm->mpid64 = htonll(cfm->mpid);
550 ccm->opdown = !cfm->opup;
552 ccm->mpid = htons(cfm->mpid);
553 ccm->mpid64 = htonll(0);
557 if (cfm->ccm_interval == 0) {
558 ovs_assert(extended);
559 ccm->interval_ms_x = htons(cfm->ccm_interval_ms);
561 ccm->interval_ms_x = htons(0);
564 if (cfm->booted && hmap_is_empty(&cfm->remote_mps)) {
565 ccm->flags |= CCM_RDI_MASK;
569 long long int delay = time_msec() - cfm->last_tx;
570 if (delay > (cfm->ccm_interval_ms * 3 / 2)) {
571 VLOG_WARN("%s: long delay of %lldms (expected %dms) sending CCM"
572 " seq %"PRIu32, cfm->name, delay, cfm->ccm_interval_ms,
576 cfm->last_tx = time_msec();
577 ovs_mutex_unlock(&mutex);
581 cfm_wait(struct cfm *cfm) OVS_EXCLUDED(mutex)
583 ovs_mutex_lock(&mutex);
584 timer_wait(&cfm->tx_timer);
585 timer_wait(&cfm->fault_timer);
586 ovs_mutex_unlock(&mutex);
589 /* Configures 'cfm' with settings from 's'. */
591 cfm_configure(struct cfm *cfm, const struct cfm_settings *s)
597 if (!cfm_is_valid_mpid(s->extended, s->mpid) || s->interval <= 0) {
601 ovs_mutex_lock(&mutex);
604 interval = ms_to_ccm_interval(s->interval);
605 interval_ms = ccm_interval_to_ms(interval);
607 atomic_store(&cfm->check_tnl_key, s->check_tnl_key);
608 atomic_store(&cfm->extended, s->extended);
610 cfm->ccm_vlan = s->ccm_vlan;
611 cfm->ccm_pcp = s->ccm_pcp & (VLAN_PCP_MASK >> VLAN_PCP_SHIFT);
612 if (s->extended && interval_ms != s->interval) {
614 interval_ms = MIN(s->interval, UINT16_MAX);
617 if (s->extended && s->demand) {
620 cfm->rx_packets = cfm_rx_packets(cfm);
626 if (interval != cfm->ccm_interval || interval_ms != cfm->ccm_interval_ms) {
627 cfm->ccm_interval = interval;
628 cfm->ccm_interval_ms = interval_ms;
630 timer_set_expired(&cfm->tx_timer);
631 timer_set_duration(&cfm->fault_timer, cfm_fault_interval(cfm));
634 ovs_mutex_unlock(&mutex);
638 /* Must be called when the netdev owned by 'cfm' should change. */
640 cfm_set_netdev(struct cfm *cfm, const struct netdev *netdev)
643 ovs_mutex_lock(&mutex);
644 if (cfm->netdev != netdev) {
645 netdev_close(cfm->netdev);
646 cfm->netdev = netdev_ref(netdev);
648 ovs_mutex_unlock(&mutex);
651 /* Returns true if 'cfm' should process packets from 'flow'. Sets
652 * fields in 'wc' that were used to make the determination. */
654 cfm_should_process_flow(const struct cfm *cfm_, const struct flow *flow,
655 struct flow_wildcards *wc)
657 struct cfm *cfm = CONST_CAST(struct cfm *, cfm_);
660 atomic_read(&cfm->check_tnl_key, &check_tnl_key);
661 memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
663 memset(&wc->masks.tunnel.tun_id, 0xff, sizeof wc->masks.tunnel.tun_id);
665 return (ntohs(flow->dl_type) == ETH_TYPE_CFM
666 && eth_addr_equals(flow->dl_dst, cfm_ccm_addr(cfm))
667 && (!check_tnl_key || flow->tunnel.tun_id == htonll(0)));
670 /* Updates internal statistics relevant to packet 'p'. Should be called on
671 * every packet whose flow returned true when passed to
672 * cfm_should_process_flow. */
674 cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
678 struct eth_header *eth;
680 ovs_mutex_lock(&mutex);
683 ccm = ofpbuf_at(p, (uint8_t *)p->l3 - (uint8_t *)p->data, CCM_ACCEPT_LEN);
686 VLOG_INFO_RL(&rl, "%s: Received an unparseable 802.1ag CCM heartbeat.",
691 if (ccm->opcode != CCM_OPCODE) {
692 VLOG_INFO_RL(&rl, "%s: Received an unsupported 802.1ag message. "
693 "(opcode %u)", cfm->name, ccm->opcode);
697 /* According to the 802.1ag specification, reception of a CCM with an
698 * incorrect ccm_interval, unexpected MAID, or unexpected MPID should
699 * trigger a fault. We ignore this requirement for several reasons.
701 * Faults can cause a controller or Open vSwitch to make potentially
702 * expensive changes to the network topology. It seems prudent to trigger
703 * them judiciously, especially when CFM is used to check slave status of
704 * bonds. Furthermore, faults can be maliciously triggered by crafting
705 * unexpected CCMs. */
706 if (memcmp(ccm->maid, cfm->maid, sizeof ccm->maid)) {
707 cfm->recv_fault |= CFM_FAULT_MAID;
708 VLOG_WARN_RL(&rl, "%s: Received unexpected remote MAID from MAC "
709 ETH_ADDR_FMT, cfm->name, ETH_ADDR_ARGS(eth->eth_src));
711 uint8_t ccm_interval = ccm->flags & 0x7;
712 bool ccm_rdi = ccm->flags & CCM_RDI_MASK;
713 uint16_t ccm_interval_ms_x = ntohs(ccm->interval_ms_x);
715 struct remote_mp *rmp;
720 enum cfm_fault_reason cfm_fault = 0;
722 atomic_read(&cfm->extended, &extended);
724 ccm_mpid = ntohll(ccm->mpid64);
725 ccm_opdown = ccm->opdown;
727 ccm_mpid = ntohs(ccm->mpid);
730 ccm_seq = ntohl(ccm->seq);
732 if (ccm_interval != cfm->ccm_interval) {
733 VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected interval"
734 " (%"PRIu8") from RMP %"PRIu64, cfm->name,
735 ccm_interval, ccm_mpid);
738 if (extended && ccm_interval == 0
739 && ccm_interval_ms_x != cfm->ccm_interval_ms) {
740 VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected extended"
741 " interval (%"PRIu16"ms) from RMP %"PRIu64, cfm->name,
742 ccm_interval_ms_x, ccm_mpid);
745 rmp = lookup_remote_mp(cfm, ccm_mpid);
747 if (hmap_count(&cfm->remote_mps) < CFM_MAX_RMPS) {
748 rmp = xzalloc(sizeof *rmp);
749 hmap_insert(&cfm->remote_mps, &rmp->node, hash_mpid(ccm_mpid));
751 cfm_fault |= CFM_FAULT_OVERFLOW;
753 "%s: dropped CCM with MPID %"PRIu64" from MAC "
754 ETH_ADDR_FMT, cfm->name, ccm_mpid,
755 ETH_ADDR_ARGS(eth->eth_src));
760 cfm_fault |= CFM_FAULT_RDI;
761 VLOG_DBG("%s: RDI bit flagged from RMP %"PRIu64, cfm->name,
765 VLOG_DBG("%s: received CCM (seq %"PRIu32") (mpid %"PRIu64")"
766 " (interval %"PRIu8") (RDI %s)", cfm->name, ccm_seq,
767 ccm_mpid, ccm_interval, ccm_rdi ? "true" : "false");
770 if (rmp->mpid == cfm->mpid) {
771 cfm_fault |= CFM_FAULT_LOOPBACK;
772 VLOG_WARN_RL(&rl,"%s: received CCM with local MPID"
773 " %"PRIu64, cfm->name, rmp->mpid);
776 if (rmp->seq && ccm_seq != (rmp->seq + 1)) {
777 VLOG_WARN_RL(&rl, "%s: (mpid %"PRIu64") detected sequence"
778 " numbers which indicate possible connectivity"
779 " problems (previous %"PRIu32") (current %"PRIu32
780 ")", cfm->name, ccm_mpid, rmp->seq, ccm_seq);
783 rmp->mpid = ccm_mpid;
785 rmp->num_health_ccm++;
788 cfm->recv_fault |= cfm_fault;
790 rmp->opup = !ccm_opdown;
791 rmp->last_rx = time_msec();
796 ovs_mutex_unlock(&mutex);
800 cfm_get_fault__(const struct cfm *cfm) OVS_REQUIRES(mutex)
802 if (cfm->fault_override >= 0) {
803 return cfm->fault_override ? CFM_FAULT_OVERRIDE : 0;
808 /* Gets the fault status of 'cfm'. Returns a bit mask of 'cfm_fault_reason's
809 * indicating the cause of the connectivity fault, or zero if there is no
812 cfm_get_fault(const struct cfm *cfm) OVS_EXCLUDED(mutex)
816 ovs_mutex_lock(&mutex);
817 fault = cfm_get_fault__(cfm);
818 ovs_mutex_unlock(&mutex);
822 /* Gets the health of 'cfm'. Returns an integer between 0 and 100 indicating
823 * the health of the link as a percentage of ccm frames received in
824 * CFM_HEALTH_INTERVAL * 'fault_interval' if there is only 1 remote_mpid,
825 * returns 0 if there are no remote_mpids, and returns -1 if there are more
826 * than 1 remote_mpids. */
828 cfm_get_health(const struct cfm *cfm) OVS_EXCLUDED(mutex)
832 ovs_mutex_lock(&mutex);
833 health = cfm->health;
834 ovs_mutex_unlock(&mutex);
838 /* Gets the operational state of 'cfm'. 'cfm' is considered operationally down
839 * if it has received a CCM with the operationally down bit set from any of its
840 * remote maintenance points. Returns 1 if 'cfm' is operationally up, 0 if
841 * 'cfm' is operationally down, or -1 if 'cfm' has no operational state
842 * (because it isn't in extended mode). */
844 cfm_get_opup(const struct cfm *cfm_) OVS_EXCLUDED(mutex)
846 struct cfm *cfm = CONST_CAST(struct cfm *, cfm_);
850 ovs_mutex_lock(&mutex);
851 atomic_read(&cfm->extended, &extended);
852 opup = extended ? cfm->remote_opup : -1;
853 ovs_mutex_unlock(&mutex);
858 /* Populates 'rmps' with an array of remote maintenance points reachable by
859 * 'cfm'. The number of remote maintenance points is written to 'n_rmps'.
860 * 'cfm' retains ownership of the array written to 'rmps' */
862 cfm_get_remote_mpids(const struct cfm *cfm, uint64_t **rmps, size_t *n_rmps)
865 ovs_mutex_lock(&mutex);
866 *rmps = xmemdup(cfm->rmps_array, cfm->rmps_array_len * sizeof **rmps);
867 *n_rmps = cfm->rmps_array_len;
868 ovs_mutex_unlock(&mutex);
872 cfm_find(const char *name) OVS_REQUIRES(mutex)
876 HMAP_FOR_EACH_WITH_HASH (cfm, hmap_node, hash_string(name, 0), all_cfms) {
877 if (!strcmp(cfm->name, name)) {
885 cfm_print_details(struct ds *ds, struct cfm *cfm) OVS_REQUIRES(mutex)
887 struct remote_mp *rmp;
891 atomic_read(&cfm->extended, &extended);
893 ds_put_format(ds, "---- %s ----\n", cfm->name);
894 ds_put_format(ds, "MPID %"PRIu64":%s%s\n", cfm->mpid,
895 extended ? " extended" : "",
896 cfm->fault_override >= 0 ? " fault_override" : "");
898 fault = cfm_get_fault__(cfm);
900 ds_put_cstr(ds, "\tfault: ");
901 ds_put_cfm_fault(ds, fault);
902 ds_put_cstr(ds, "\n");
905 if (cfm->health == -1) {
906 ds_put_format(ds, "\taverage health: undefined\n");
908 ds_put_format(ds, "\taverage health: %d\n", cfm->health);
910 ds_put_format(ds, "\topstate: %s\n", cfm->opup ? "up" : "down");
911 ds_put_format(ds, "\tremote_opstate: %s\n",
912 cfm->remote_opup ? "up" : "down");
913 ds_put_format(ds, "\tinterval: %dms\n", cfm->ccm_interval_ms);
914 ds_put_format(ds, "\tnext CCM tx: %lldms\n",
915 timer_msecs_until_expired(&cfm->tx_timer));
916 ds_put_format(ds, "\tnext fault check: %lldms\n",
917 timer_msecs_until_expired(&cfm->fault_timer));
919 HMAP_FOR_EACH (rmp, node, &cfm->remote_mps) {
920 ds_put_format(ds, "Remote MPID %"PRIu64"\n", rmp->mpid);
921 ds_put_format(ds, "\trecv since check: %s\n",
922 rmp->recv ? "true" : "false");
923 ds_put_format(ds, "\topstate: %s\n", rmp->opup? "up" : "down");
928 cfm_unixctl_show(struct unixctl_conn *conn, int argc, const char *argv[],
929 void *aux OVS_UNUSED) OVS_EXCLUDED(mutex)
931 struct ds ds = DS_EMPTY_INITIALIZER;
934 ovs_mutex_lock(&mutex);
936 cfm = cfm_find(argv[1]);
938 unixctl_command_reply_error(conn, "no such CFM object");
941 cfm_print_details(&ds, cfm);
943 HMAP_FOR_EACH (cfm, hmap_node, all_cfms) {
944 cfm_print_details(&ds, cfm);
948 unixctl_command_reply(conn, ds_cstr(&ds));
951 ovs_mutex_unlock(&mutex);
955 cfm_unixctl_set_fault(struct unixctl_conn *conn, int argc, const char *argv[],
956 void *aux OVS_UNUSED) OVS_EXCLUDED(mutex)
958 const char *fault_str = argv[argc - 1];
962 ovs_mutex_lock(&mutex);
963 if (!strcasecmp("true", fault_str)) {
965 } else if (!strcasecmp("false", fault_str)) {
967 } else if (!strcasecmp("normal", fault_str)) {
970 unixctl_command_reply_error(conn, "unknown fault string");
975 cfm = cfm_find(argv[1]);
977 unixctl_command_reply_error(conn, "no such CFM object");
980 cfm->fault_override = fault_override;
982 HMAP_FOR_EACH (cfm, hmap_node, all_cfms) {
983 cfm->fault_override = fault_override;
987 unixctl_command_reply(conn, "OK");
990 ovs_mutex_unlock(&mutex);