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 d758ea1..7cdd2bf 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -259,16 +259,14 @@
#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;