LU-5485 lnet: peer aliveness status and NI status

A couple of changes to improve aliveness detection:
- When LNet received a message, it can determine peer of this message
  is alive

- When LNet recieved a message from remote network, it can determine
  router is alive and NI status on router is UP.

Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Change-Id: I4e0c65580a9cbaf4746f871bac02e6af7498de64
Reviewed-on: http://review.whamcloud.com/12435
Tested-by: Jenkins
Reviewed-by: Isaac Huang <he.huang@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lnet/include/lnet/lib-lnet.h b/lnet/include/lnet/lib-lnet.h
index 9cebc3a..d6b341e 100644 (file)
--- a/lnet/include/lnet/lib-lnet.h
+++ b/lnet/include/lnet/lib-lnet.h
@@ -945,6 +945,7 @@ int lnet_peer_buffer_credits(lnet_ni_t *ni);
 
 int lnet_router_checker_start(void);
 void lnet_router_checker_stop(void);
+void lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net);
 void lnet_swap_pinginfo(lnet_ping_info_t *info);
 
 int lnet_ping_target_init(void);
@@ -964,6 +965,14 @@ void lnet_peer_tables_destroy(void);
 int lnet_peer_tables_create(void);
 void lnet_debug_peer(lnet_nid_t nid);
 
+static inline void
+lnet_peer_set_alive(lnet_peer_t *lp)
+{
+       lp->lp_last_alive = lp->lp_last_query = cfs_time_current();
+       if (!lp->lp_alive)
+               lnet_notify_locked(lp, 0, 1, lp->lp_last_alive);
+}
+
 #ifndef __KERNEL__
 static inline int
 lnet_parse_int_tunable(int *value, char *name)

diff --git a/lnet/lnet/lib-move.c b/lnet/lnet/lib-move.c
index 406e2ed..50eeccb 100644 (file)
--- a/lnet/lnet/lib-move.c
+++ b/lnet/lnet/lib-move.c
@@ -1957,6 +1957,19 @@ lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
                goto drop;
        }
 
+       if (lnet_isrouter(msg->msg_rxpeer)) {
+               lnet_peer_set_alive(msg->msg_rxpeer);
+
+               if (LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
+                       /* received a remote message from router, update
+                        * remote NI status on this router.
+                        * NB: multi-hop routed message will be ignored.
+                        */
+                       lnet_router_ni_update_locked(msg->msg_rxpeer,
+                                                    LNET_NIDNET(src_nid));
+               }
+       }
+
        lnet_msg_commit(msg, cpt);
 
        if (!for_me) {

diff --git a/lnet/lnet/router.c b/lnet/lnet/router.c
index 53e1aff..ac06d49 100644 (file)
--- a/lnet/lnet/router.c
+++ b/lnet/lnet/router.c
@@ -787,6 +787,24 @@ lnet_wait_known_routerstate(void)
 }
 
 void
+lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
+{
+       lnet_route_t *rte;
+
+       if (!avoid_asym_router_failure)
+               return;
+
+       if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
+               cfs_list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
+                       if (rte->lr_net == net) {
+                               rte->lr_downis = 0;
+                               break;
+                       }
+               }
+       }
+}
+
+void
 lnet_update_ni_status_locked(void)
 {
        lnet_ni_t       *ni;