[lustre-devel] [PATCH 37/37] lnet: check rtr_nid is a gateway
James Simmons
jsimmons at infradead.org
Wed Jul 15 13:45:18 PDT 2020
From: Amir Shehata <ashehata at whamcloud.com>
The rtr_nid is specified for all REPLY/ACK. However it is possible
for the route through the gateway specified by rtr_nid to be removed.
In this case we don't want to use it. We should lookup alternative
paths.
This patch checks if the peer looked up is indeed a gateway. If it's
not a gateway then we attempt to find another path. There is no need
to fail right away. It's not a hard requirement to fail if the default
rtr_nid is not valid.
WC-bug-id: https://jira.whamcloud.com/browse/LU-13713
Lustre-commit: 07397a2e7473c ("LU-13713 lnet: check rtr_nid is a gateway")
Signed-off-by: Amir Shehata <ashehata at whamcloud.com>
Reviewed-on: https://review.whamcloud.com/39175
Reviewed-by: Chris Horn <chris.horn at hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov at whamcloud.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
net/lnet/lnet/lib-move.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/net/lnet/lnet/lib-move.c b/net/lnet/lnet/lib-move.c
index 234fbb5..c0dd30c 100644
--- a/net/lnet/lnet/lib-move.c
+++ b/net/lnet/lnet/lib-move.c
@@ -1777,6 +1777,7 @@ struct lnet_ni *
struct lnet_route *last_route = NULL;
struct lnet_peer_ni *lpni = NULL;
struct lnet_peer_ni *gwni = NULL;
+ bool route_found = false;
lnet_nid_t src_nid = (sd->sd_src_nid != LNET_NID_ANY) ? sd->sd_src_nid :
sd->sd_best_ni ? sd->sd_best_ni->ni_nid :
LNET_NID_ANY;
@@ -1790,15 +1791,20 @@ struct lnet_ni *
*/
if (sd->sd_rtr_nid != LNET_NID_ANY) {
gwni = lnet_find_peer_ni_locked(sd->sd_rtr_nid);
- if (!gwni) {
- CERROR("No peer NI for gateway %s\n",
+ if (gwni) {
+ gw = gwni->lpni_peer_net->lpn_peer;
+ lnet_peer_ni_decref_locked(gwni);
+ if (gw->lp_rtr_refcount) {
+ local_lnet = LNET_NIDNET(sd->sd_rtr_nid);
+ route_found = true;
+ }
+ } else {
+ CWARN("No peer NI for gateway %s. Attempting to find an alternative route.\n",
libcfs_nid2str(sd->sd_rtr_nid));
- return -EHOSTUNREACH;
}
- gw = gwni->lpni_peer_net->lpn_peer;
- lnet_peer_ni_decref_locked(gwni);
- local_lnet = LNET_NIDNET(sd->sd_rtr_nid);
- } else {
+ }
+
+ if (!route_found) {
/* we've already looked up the initial lpni using dst_nid */
lpni = sd->sd_best_lpni;
/* the peer tree must be in existence */
--
1.8.3.1
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