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udp: split sk_hash into two u16 hashes

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Union sk_hash with two u16 hashes for udp (no extra memory taken)

One 16 bits hash on (local port) value (the previous udp 'hash')

One 16 bits hash on (local address, local port) values, initialized
but not yet used. This second hash is using jenkin hash for better
distribution.

Because the 'port' is xored later, a partial hash is performed
on local address + net_hash_mix(net)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2009-11-08 10:17:30 +00:00
committed by David S. Miller
parent fdcc8aa953
commit d4cada4ae1
4 changed files with 51 additions and 9 deletions
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6
include/net/sock.h
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@ -109,6 +109,7 @@ struct net;
* @skc_refcnt: reference count
* @skc_tx_queue_mapping: tx queue number for this connection
* @skc_hash: hash value used with various protocol lookup tables
* @skc_u16hashes: two u16 hash values used by UDP lookup tables
* @skc_family: network address family
* @skc_state: Connection state
* @skc_reuse: %SO_REUSEADDR setting
@ -131,7 +132,10 @@ struct sock_common {
atomic_t skc_refcnt;
int skc_tx_queue_mapping;
unsigned int skc_hash;
union {
unsigned int skc_hash;
__u16 skc_u16hashes[2];
};
unsigned short skc_family;
volatile unsigned char skc_state;
unsigned char skc_reuse;