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Date: Wed, 21 Dec 2011 13:12:03 +0800
From: Michael Wang <wangyun@...ux.vnet.ibm.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: Michael Wang <wangyun@...ux.vnet.ibm.com>
Subject: [PATCH] Avoid extra calculation in ip_route_input_common
From: Michael Wang <wangyun@...ux.vnet.ibm.com>
If previous condition doesn't meet, the later check will be cancelled.
So we don't need to do all the calculation.
Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
net/ipv4/route.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index f30112f..2872bfb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2362,10 +2362,10 @@ int ip_route_input_common(struct sk_buff *skb, __be32 daddr, __be32 saddr,
for (rth = rcu_dereference(rt_hash_table[hash].chain); rth;
rth = rcu_dereference(rth->dst.rt_next)) {
- if ((((__force u32)rth->rt_key_dst ^ (__force u32)daddr) |
- ((__force u32)rth->rt_key_src ^ (__force u32)saddr) |
- (rth->rt_route_iif ^ iif) |
- (rth->rt_key_tos ^ tos)) == 0 &&
+ if (((__force u32)rth->rt_key_dst ^ (__force u32)daddr) == 0 &&
+ ((__force u32)rth->rt_key_src ^ (__force u32)saddr) == 0 &&
+ rth->rt_route_iif == iif &&
+ rth->rt_key_tos == tos &&
rth->rt_mark == skb->mark &&
net_eq(dev_net(rth->dst.dev), net) &&
!rt_is_expired(rth)) {
--
1.7.4.1
--
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