cfm: Don't enforce CFM_FAULT_INTERVAL.

While upgrading a deployment, it's possible that transient
configuration changes could cause the cfm interval on two ends of a
link to be different.  If these two configured values are close to
each other, this condition could have no impact on traffic.  Therefore
it's better to let this slide than force a tunnel down guaranteeing an
impact

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

2 files changed, 1 insertions, 4 deletions

diff --git a/lib/cfm.c b/lib/cfm.c
index e1866ff5d..e8f86dc9f 100644
--- a/lib/cfm.c
+++ b/lib/cfm.c
@@ -730,7 +730,6 @@ cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
         ccm_seq = ntohl(ccm->seq);
 
         if (ccm_interval != cfm->ccm_interval) {
-            cfm_fault |= CFM_FAULT_INTERVAL;
             VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected interval"
                          " (%"PRIu8") from RMP %"PRIu64, cfm->name,
                          ccm_interval, ccm_mpid);
@@ -738,7 +737,6 @@ cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
 
         if (extended && ccm_interval == 0
             && ccm_interval_ms_x != cfm->ccm_interval_ms) {
-            cfm_fault |= CFM_FAULT_INTERVAL;
             VLOG_WARN_RL(&rl, "%s: received a CCM with an unexpected extended"
                          " interval (%"PRIu16"ms) from RMP %"PRIu64, cfm->name,
                          ccm_interval_ms_x, ccm_mpid);
diff --git a/lib/cfm.h b/lib/cfm.h
index 0f3e97c33..cff713f98 100644
--- a/lib/cfm.h
+++ b/lib/cfm.h
@@ -34,8 +34,7 @@ struct flow_wildcards;
     CFM_FAULT_REASON(MAID, maid)           \
     CFM_FAULT_REASON(LOOPBACK, loopback)   \
     CFM_FAULT_REASON(OVERFLOW, overflow)   \
-    CFM_FAULT_REASON(OVERRIDE, override)   \
-    CFM_FAULT_REASON(INTERVAL, interval)
+    CFM_FAULT_REASON(OVERRIDE, override)
 
 enum cfm_fault_bit_index {
 #define CFM_FAULT_REASON(NAME, STR) CFM_FAULT_INDEX_##NAME,