From 72cdd1d971c0deb1619c5c339270570c43647a78 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 11 Nov 2010 07:14:07 +0000
Subject: net: get rid of rtable->idev

It seems idev field in struct rtable has no special purpose, but adding
extra atomic ops.

We hold refcounts on the device itself (using percpu data, so pretty
cheap in current kernel).

infiniband case is solved using dst.dev instead of idev->dev

Removal of this field means routing without route cache is now using
shared data, percpu data, and only potential contention is a pair of
atomic ops on struct neighbour per forwarded packet.

About 5% speedup on routing test.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/net/route.h | 2 --
 1 file changed, 2 deletions(-)

(limited to 'include/net/route.h')

diff --git a/include/net/route.h b/include/net/route.h
index 7e5e73bfa4de..cea533eaa853 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -55,8 +55,6 @@ struct rtable {
 	/* Cache lookup keys */
 	struct flowi		fl;
 
-	struct in_device	*idev;
-	
 	int			rt_genid;
 	unsigned		rt_flags;
 	__u16			rt_type;
-- 
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