From 4331debc51ee1ce319f4a389484e0e8e05de2aca Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 25 Jul 2012 05:11:23 +0000 Subject: [PATCH] ipv4: rt_cache_valid must check expired routes 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 Signed-off-by: David S. Miller --- 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 6bcb8fc71cbc..3f7bb7185c50 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, -- 2.20.1