From: Stephen Hemminger <shemminger@vyatta.com>
Date: Thu, 10 Apr 2008 08:54:01 +0000 (-0700)
Subject: IPV4: route use jhash3
X-Git-Tag: v2.6.26-rc1~1138^2~149
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1294fc4a4868d7e83ff749597fbf4e9d5f4d1aa0;p=linux-2.6

IPV4: route use jhash3

Since route hash is a triple, use jhash_3words rather doing the mixing
directly. This should be as fast and give better distribution.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index d758ea1d80..7cdd2bf88e 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -259,16 +259,14 @@ static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
 #define RT_CACHE_STAT_INC(field) \
 	(__raw_get_cpu_var(rt_cache_stat).field++)
 
-static unsigned int rt_hash_code(u32 daddr, u32 saddr)
+static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx)
 {
-	return jhash_2words(daddr, saddr, atomic_read(&rt_genid))
+	return jhash_3words((__force u32)(__be32)(daddr),
+			    (__force u32)(__be32)(saddr),
+			    idx, atomic_read(&rt_genid))
 		& rt_hash_mask;
 }
 
-#define rt_hash(daddr, saddr, idx) \
-	rt_hash_code((__force u32)(__be32)(daddr),\
-		     (__force u32)(__be32)(saddr) ^ ((idx) << 5))
-
 #ifdef CONFIG_PROC_FS
 struct rt_cache_iter_state {
 	struct seq_net_private p;