LU-13569 lnet: Recover peer NI w/exponential backoff interval

[fs/lustre-release.git] / lnet / include / lnet / lib-lnet.h

diff --git a/lnet/include/lnet/lib-lnet.h b/lnet/include/lnet/lib-lnet.h
index bb5eed0..1358f6f 100644 (file)
--- a/lnet/include/lnet/lib-lnet.h
+++ b/lnet/include/lnet/lib-lnet.h
@@ -986,6 +986,28 @@ lnet_peer_needs_push(struct lnet_peer *lp)
        return false;
 }
 
+#define LNET_RECOVERY_INTERVAL_MAX 900
+static inline unsigned int
+lnet_get_next_recovery_ping(unsigned int ping_count, time64_t now)
+{
+       unsigned int interval;
+
+       /* 2^9 = 512, 2^10 = 1024 */
+       if (ping_count > 9)
+               interval = LNET_RECOVERY_INTERVAL_MAX;
+       else
+               interval = 1 << ping_count;
+
+       return now + interval;
+}
+
+static inline void
+lnet_peer_ni_set_next_ping(struct lnet_peer_ni *lpni, time64_t now)
+{
+       lpni->lpni_next_ping =
+               lnet_get_next_recovery_ping(lpni->lpni_ping_count, now);
+}
+
 /*
  * A peer NI is alive if it satisfies the following two conditions:
  *  1. peer NI health >= LNET_MAX_HEALTH_VALUE * router_sensitivity_percentage