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ipv4: rt_cache_valid must check expired routes 

commit d2d68ba9fe (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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-07-25 05:11:23 +00:00 committed by David S. Miller
parent 6d8d2dd8ad
commit 4331debc51
1 changed files with 5 additions and 3 deletions
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8
net/ipv4/route.c
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@ -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,