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| author | Eric Dumazet <edumazet@google.com> | 2012-07-18 08:11:12 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-18 11:28:46 -0700 |
| commit | ddbe503203855939946430e39bae58de11b70b69 (patch) | |
| tree | 1605a8d3b14a92819eb8ed47ae5a84c1b66e12f8 /net/ipv4/tcp_metrics.c | |
| parent | dc9059512c09d09b99de6cd3a8bc842507934cbb (diff) | |
| download | linux-stable-ddbe503203855939946430e39bae58de11b70b69.tar.gz linux-stable-ddbe503203855939946430e39bae58de11b70b69.tar.bz2 linux-stable-ddbe503203855939946430e39bae58de11b70b69.zip | |
ipv6: add ipv6_addr_hash() helper
Introduce ipv6_addr_hash() helper doing a XOR on all bits
of an IPv6 address, with an optimized x86_64 version.
Use it in flow dissector, as suggested by Andrew McGregor,
to reduce hash collision probabilities in fq_codel (and other
users of flow dissector)
Use it in ip6_tunnel.c and use more bit shuffling, as suggested
by David Laight, as existing hash was ignoring most of them.
Use it in sunrpc and use more bit shuffling, using hash_32().
Use it in net/ipv6/addrconf.c, using hash_32() as well.
As a cleanup, use it in net/ipv4/tcp_metrics.c
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrew McGregor <andrewmcgr@gmail.com>
Cc: Dave Taht <dave.taht@gmail.com>
Cc: Tom Herbert <therbert@google.com>
Cc: David Laight <David.Laight@ACULAB.COM>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_metrics.c')
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 5a38a2d5a95b..1a115b665792 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -211,10 +211,7 @@ static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req, break; case AF_INET6: *(struct in6_addr *)addr.addr.a6 = inet6_rsk(req)->rmt_addr; - hash = ((__force unsigned int) addr.addr.a6[0] ^ - (__force unsigned int) addr.addr.a6[1] ^ - (__force unsigned int) addr.addr.a6[2] ^ - (__force unsigned int) addr.addr.a6[3]); + hash = ipv6_addr_hash(&inet6_rsk(req)->rmt_addr); break; default: return NULL; @@ -251,10 +248,7 @@ static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock case AF_INET6: tw6 = inet6_twsk((struct sock *)tw); *(struct in6_addr *)addr.addr.a6 = tw6->tw_v6_daddr; - hash = ((__force unsigned int) addr.addr.a6[0] ^ - (__force unsigned int) addr.addr.a6[1] ^ - (__force unsigned int) addr.addr.a6[2] ^ - (__force unsigned int) addr.addr.a6[3]); + hash = ipv6_addr_hash(&tw6->tw_v6_daddr); break; default: return NULL; @@ -291,10 +285,7 @@ static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk, break; case AF_INET6: *(struct in6_addr *)addr.addr.a6 = inet6_sk(sk)->daddr; - hash = ((__force unsigned int) addr.addr.a6[0] ^ - (__force unsigned int) addr.addr.a6[1] ^ - (__force unsigned int) addr.addr.a6[2] ^ - (__force unsigned int) addr.addr.a6[3]); + hash = ipv6_addr_hash(&inet6_sk(sk)->daddr); break; default: return NULL; |