netdev - [PATCH RFC v4 net 2/3] ipv6: Avoid redoing fib6_lookup() for RTF

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Date:	Fri, 10 Oct 2014 11:48:07 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	<netdev@...r.kernel.org>
CC:	David Miller <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: [PATCH RFC v4 net 2/3] ipv6: Avoid redoing fib6_lookup() for RTF_CACHE hit case

When there is a RTF_CACHE hit, no need to redo fib6_lookup()
with reachable=0.

Cc: David Miller <davem@...emloft.net>
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: Martin KaFai Lau <kafai@...com>
---
 net/ipv6/route.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 797a6e7..5469ecf 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -927,12 +927,12 @@ redo_rt6_select:
 			goto out;
 	}
 
-	if (rt->rt6i_flags & RTF_CACHE)
-		goto out;
-
 	dst_hold(&rt->dst);
 	read_unlock_bh(&table->tb6_lock);
 
+	if (rt->rt6i_flags & RTF_CACHE)
+		goto out2;
+
 	if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
 		nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
 	else if (!(rt->dst.flags & DST_HOST))
-- 
1.8.1

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