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| author | Pavel Emelyanov <xemul@openvz.org> | 2008-06-16 17:14:11 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-16 17:14:11 -0700 |
| commit | 0b4419162aa6c4204843f3a13b48d9ab821d3167 (patch) | |
| tree | 1c475a8f59b7fce528eb97c6709b25145c110c33 /include/linux/udp.h | |
| parent | 33de014c63646f69f36f3673e3b4676f931dc878 (diff) | |
| download | lwn-0b4419162aa6c4204843f3a13b48d9ab821d3167.tar.gz lwn-0b4419162aa6c4204843f3a13b48d9ab821d3167.zip | |
netns: introduce the net_hash_mix "salt" for hashes
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>
Diffstat (limited to 'include/linux/udp.h')
| -rw-r--r-- | include/linux/udp.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/udp.h b/include/linux/udp.h index 3deccac2e815..0cf5c4c0ec81 100644 --- a/include/linux/udp.h +++ b/include/linux/udp.h @@ -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 { |