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netns: introduce the net_hash_mix "salt" for hashes

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There are many possible ways to add this "salt", thus I made this
patch to be the last in the series to change it if required.

Currently I propose to use the struct net pointer itself as this 
salt, but since this pointer is most often cache-line aligned, shift 
this right to eliminate the bits, that are most often zeroed.

After this, simply add this mix to prepared hashfn-s.

For CONFIG_NET_NS=n case this salt is 0 and no changes in hashfn
appear.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-06-16 17:14:11 -07:00 • committed by David S. Miller
parent 33de014c63
commit 0b4419162a
5 changed files with 30 additions and 5 deletions
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3
include/linux/udp.h
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@ -38,6 +38,7 @@ struct udphdr {
#ifdef __KERNEL__
#include <net/inet_sock.h>
#include <linux/skbuff.h>
#include <net/netns/hash.h>
static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
{
@ -48,7 +49,7 @@ static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
static inline int udp_hashfn(struct net *net, const unsigned num)
{
return num & (UDP_HTABLE_SIZE - 1);
return (num + net_hash_mix(net)) & (UDP_HTABLE_SIZE - 1);
}
struct udp_sock {