X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fcfm.c;h=5a547d0d885018e2ae298ab5b16e60a69d9e884e;hb=7feba1acdd806b54ec152d2e93169ab2a295128d;hp=f6cfb2e675ef2edfa5d2bf94cbf055e7312561a9;hpb=6fabb78d45211260c388979baab5b757ec76e33e;p=openvswitch

diff --git a/lib/cfm.c b/lib/cfm.c
index f6cfb2e6..5a547d0d 100644
--- a/lib/cfm.c
+++ b/lib/cfm.c
@@ -67,6 +67,20 @@ ccm_interval_to_ms(uint8_t interval)
     NOT_REACHED();
 }
 
+static long long int
+cfm_fault_interval(struct cfm_internal *cfmi)
+{
+    /* According to the 802.1ag specification we should assume every other MP
+     * with the same MAID has the same transmission interval that we have.  If
+     * an MP has a different interval, cfm_process_heartbeat will register it
+     * as a fault (likely due to a configuration error).  Thus we can check all
+     * MPs at once making this quite a bit simpler.
+     *
+     * According to the specification we should check when (ccm_interval_ms *
+     * 3.5)ms have passed. */
+    return (cfmi->ccm_interval_ms * 7) / 2;
+}
+
 static uint8_t
 ms_to_ccm_interval(int interval_ms)
 {
@@ -156,22 +170,12 @@ cfm_run(struct cfm *cfm)
 {
     long long now = time_msec();
     struct cfm_internal *cfmi = cfm_to_internal(cfm);
-    long long fault_interval;
 
-    /* According to the 802.1ag specification we should assume every other MP
-     * with the same MAID has the same transmission interval that we have.  If
-     * an MP has a different interval, cfm_process_heartbeat will register it
-     * as a fault (likely due to a configuration error).  Thus we can check all
-     * MPs at once making this quite a bit simpler.
-     *
-     * According to the specification we should check when (ccm_interval_ms *
-     * 3.5)ms have passed. */
-    fault_interval = (cfmi->ccm_interval_ms * 7) / 2;
     if (timer_expired(&cfmi->fault_timer)) {
         bool fault;
         struct remote_mp *rmp;
 
-        fault = now < cfmi->x_recv_time + fault_interval;
+        fault = now < cfmi->x_recv_time + cfm_fault_interval(cfmi);
 
         HMAP_FOR_EACH (rmp, node, &cfm->remote_mps) {
             if (timer_expired_at(&cfmi->fault_timer, rmp->recv_time)) {
@@ -184,7 +188,7 @@ cfm_run(struct cfm *cfm)
         }
 
         cfm->fault = fault;
-        timer_set_duration(&cfmi->fault_timer, fault_interval);
+        timer_set_duration(&cfmi->fault_timer, cfm_fault_interval(cfmi));
     }
 }
 
@@ -230,19 +234,23 @@ cfm_wait(struct cfm *cfm)
 bool
 cfm_configure(struct cfm *cfm)
 {
-    struct cfm_internal *cfmi;
+    struct cfm_internal *cfmi = cfm_to_internal(cfm);
+    uint8_t interval;
 
     if (!cfm_is_valid_mpid(cfm->mpid) || !cfm->interval) {
         return false;
     }
 
-    cfmi                  = cfm_to_internal(cfm);
-    cfmi->ccm_interval    = ms_to_ccm_interval(cfm->interval);
-    cfmi->ccm_interval_ms = ccm_interval_to_ms(cfmi->ccm_interval);
+    interval = ms_to_ccm_interval(cfm->interval);
+
+    if (interval != cfmi->ccm_interval) {
+        cfmi->ccm_interval = interval;
+        cfmi->ccm_interval_ms = ccm_interval_to_ms(interval);
+
+        timer_set_expired(&cfmi->tx_timer);
+        timer_set_duration(&cfmi->fault_timer, cfm_fault_interval(cfmi));
+    }
 
-    /* Force a resend and check in case anything changed. */
-    timer_set_expired(&cfmi->tx_timer);
-    timer_set_expired(&cfmi->fault_timer);
     return true;
 }