LU-16451 kfilnd: Throttle traffic to down peers

[fs/lustre-release.git] / lnet / klnds / kfilnd / kfilnd.h

diff --git a/lnet/klnds/kfilnd/kfilnd.h b/lnet/klnds/kfilnd/kfilnd.h
index b8243d8..3173959 100644 (file)
--- a/lnet/klnds/kfilnd/kfilnd.h
+++ b/lnet/klnds/kfilnd/kfilnd.h
@@ -227,6 +227,8 @@ struct kfilnd_ep {
 #define KP_STATE_UPTODATE 0x2
 /* Peer experienced some sort of network failure */
 #define KP_STATE_STALE 0x3
+/* We suspect this peer is actually down or otherwise unreachable */
+#define KP_STATE_DOWN 0x4
 
 struct kfilnd_peer {
        struct rhash_head kp_node;
@@ -270,6 +272,13 @@ static inline bool kfilnd_peer_is_new_peer(struct kfilnd_peer *kp)
        return atomic_read(&kp->kp_state) == KP_STATE_NEW;
 }
 
+static inline bool kfilnd_peer_needs_throttle(struct kfilnd_peer *kp)
+{
+       unsigned int kp_state = atomic_read(&kp->kp_state);
+
+       return (kp_state == KP_STATE_NEW || kp_state == KP_STATE_DOWN);
+}
+
 /* Peer needs hello if it is not up to date and there is not already a hello
  * in flight.
  *