linux-kernel - [PATCH 3.16 151/305] IB/IPoIB: Don't update neigh validity for unresolved entries

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Message-ID: <lsq.1471110171.756495652@decadent.org.uk>
Date:	Sat, 13 Aug 2016 18:42:51 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Doug Ledford" <dledford@...hat.com>,
	"Erez Shitrit" <erezsh@...lanox.com>,
	"Leon Romanovsky" <leon@...nel.org>
Subject: [PATCH 3.16 151/305] IB/IPoIB: Don't update neigh validity for
 unresolved entries

3.16.37-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Erez Shitrit <erezsh@...lanox.com>

commit 61c78eea9516a921799c17b4c20558e2aa780fd3 upstream.

ipoib_neigh_get unconditionally updates the "alive" variable member on
any packet send.  This prevents the neighbor garbage collection from
cleaning out a dead neighbor entry if we are still queueing packets
for it.  If the queue for this neighbor is full, then don't update the
alive timestamp.  That way the neighbor can time out even if packets
are still being queued as long as none of them are being sent.

Fixes: b63b70d87741 ("IPoIB: Use a private hash table for path lookup in xmit path")
Signed-off-by: Erez Shitrit <erezsh@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -884,7 +884,9 @@ struct ipoib_neigh *ipoib_neigh_get(stru
 				neigh = NULL;
 				goto out_unlock;
 			}
-			neigh->alive = jiffies;
+
+			if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
+				neigh->alive = jiffies;
 			goto out_unlock;
 		}
 	}