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>
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5bc7cdb..1e5fadd 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -81,8 +81,30 @@
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 @@
{
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 @@
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)