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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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27
net/ipv6/udp.c
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@@ -81,8 +81,30 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
return 0;
}
static unsigned int udp6_portaddr_hash(struct net *net,
const struct in6_addr *addr6,
unsigned int port)
{
unsigned int hash, mix = net_hash_mix(net);
if (ipv6_addr_any(addr6))
hash = jhash_1word(0, mix);
else if (ipv6_addr_type(addr6) == IPV6_ADDR_MAPPED)
hash = jhash_1word(addr6->s6_addr32[3], mix);
else
hash = jhash2(addr6->s6_addr32, 4, mix);
return hash ^ port;
}
int udp_v6_get_port(struct sock *sk, unsigned short snum)
{
/* precompute partial secondary hash */
udp_sk(sk)->udp_portaddr_hash =
udp6_portaddr_hash(sock_net(sk),
&inet6_sk(sk)->rcv_saddr,
0);
return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal);
}
@@ -94,7 +116,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
{
int score = -1;
if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
sk->sk_family == PF_INET6) {
struct ipv6_pinfo *np = inet6_sk(sk);
struct inet_sock *inet = inet_sk(sk);
@@ -415,7 +437,8 @@ static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
if (!net_eq(sock_net(s), net))
continue;
if (s->sk_hash == num && s->sk_family == PF_INET6) {
if (udp_sk(s)->udp_port_hash == num &&
s->sk_family == PF_INET6) {
struct ipv6_pinfo *np = inet6_sk(s);
if (inet->inet_dport) {
if (inet->inet_dport != rmt_port)