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| author | Eric Dumazet | 2009-11-08 11:17:30 +0100 |
|---|---|---|
| committer | David S. Miller | 2009-11-09 05:53:05 +0100 |
| commit | d4cada4ae1c012815f95fa507eb86a0ae9d607d7 (patch) | |
| tree | 23cdfb3763c9140ae095bf8095c3e6b16f7b48f3 /include | |
| parent | udp: add a counter into udp_hslot (diff) | |
| download | kernel-qcow2-linux-d4cada4ae1c012815f95fa507eb86a0ae9d607d7.tar.gz kernel-qcow2-linux-d4cada4ae1c012815f95fa507eb86a0ae9d607d7.tar.xz kernel-qcow2-linux-d4cada4ae1c012815f95fa507eb86a0ae9d607d7.zip | |
udp: split sk_hash into two u16 hashes
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/udp.h | 2 | ||||
| -rw-r--r-- | include/net/sock.h | 6 |
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/udp.h b/include/linux/udp.h index 832361e3e596..5b4b5274e683 100644 --- a/include/linux/udp.h +++ b/include/linux/udp.h @@ -55,6 +55,8 @@ static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask) struct udp_sock { /* inet_sock has to be the first member */ struct inet_sock inet; +#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0] +#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1] int pending; /* Any pending frames ? */ unsigned int corkflag; /* Cork is required */ __u16 encap_type; /* Is this an Encapsulation socket? */ diff --git a/include/net/sock.h b/include/net/sock.h index 55de3bd719a5..827366b62680 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -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; |