* [PATCH] ipv4: rt_cache_valid must check expired routes
@ 2012-07-25 15:11 Eric Dumazet
2012-07-25 22:25 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Eric Dumazet @ 2012-07-25 15:11 UTC (permalink / raw)
To: David Miller; +Cc: netdev
From: Eric Dumazet <edumazet@google.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@google.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,
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ipv4: rt_cache_valid must check expired routes
2012-07-25 15:11 [PATCH] ipv4: rt_cache_valid must check expired routes Eric Dumazet
@ 2012-07-25 22:25 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2012-07-25 22:25 UTC (permalink / raw)
To: eric.dumazet; +Cc: netdev
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 25 Jul 2012 17:11:23 +0200
> From: Eric Dumazet <edumazet@google.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@google.com>
Applied, thanks.
> ---
> This patch is bringed by an European guy, but its still July after
> all ;)
:-)
^ permalink raw reply [flat|nested] 2+ messages in thread
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