aboutsummaryrefslogtreecommitdiff
path: root/net/ipv4/tcp_metrics.c
diff options
context:
space:
mode:
authorEric Dumazet <edumazet@google.com>2012-07-18 08:11:12 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-18 11:28:46 -0700
commitddbe503203855939946430e39bae58de11b70b69 (patch)
tree1605a8d3b14a92819eb8ed47ae5a84c1b66e12f8 /net/ipv4/tcp_metrics.c
parentdc9059512c09d09b99de6cd3a8bc842507934cbb (diff)
downloadlinux-stericsson-ddbe503203855939946430e39bae58de11b70b69.tar.gz
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.c15
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;