netdev - [PATCH] ipv4: rt_cache_valid must check expired routes

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Date:	Wed, 25 Jul 2012 17:11:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH] ipv4: rt_cache_valid must check expired routes

From: Eric Dumazet <edumazet@...gle.com>

commit d2d68ba9fe8 (ipv4: Cache input routes in fib_info nexthops.)
introduced rt_cache_valid() helper. It unfortunately doesn't check if
route is expired before caching it.

I noticed sk_setup_caps() was constantly called on a tcp workload.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
This patch is bringed by an European guy, but its still July after
all ;)

 net/ipv4/route.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 6bcb8fc..30e7021 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -444,7 +444,7 @@ static inline int ip_rt_proc_init(void)
 }
 #endif /* CONFIG_PROC_FS */
 
-static inline int rt_is_expired(struct rtable *rth)
+static inline bool rt_is_expired(const struct rtable *rth)
 {
 	return rth->rt_genid != rt_genid(dev_net(rth->dst.dev));
 }
@@ -1222,9 +1222,11 @@ static void rt_cache_route(struct fib_nh *nh, struct rtable *rt)
 	}
 }
 
-static bool rt_cache_valid(struct rtable *rt)
+static bool rt_cache_valid(const struct rtable *rt)
 {
-	return (rt && rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK);
+	return	rt &&
+		rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
+		!rt_is_expired(rt);
 }
 
 static void rt_set_nexthop(struct rtable *rt, __be32 daddr,


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