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authorEric Dumazet <edumazet@google.com>2014-06-27 19:36:16 +0400
committerDavid S. Miller <davem@davemloft.net>2014-07-02 10:46:21 +0400
commit9fe516ba3fb29b6f6a752ffd93342fdee500ec01 (patch)
tree4254ea02ed5d51d92fd7109d33d28bc95b8d3fb1 /include/linux/ipv6.h
parent090cce42639c2c82bce2cc26a902e4c674c62882 (diff)
downloadlinux-9fe516ba3fb29b6f6a752ffd93342fdee500ec01.tar.xz
inet: move ipv6only in sock_common
When an UDP application switches from AF_INET to AF_INET6 sockets, we have a small performance degradation for IPv4 communications because of extra cache line misses to access ipv6only information. This can also be noticed for TCP listeners, as ipv6_only_sock() is also used from __inet_lookup_listener()->compute_score() This is magnified when SO_REUSEPORT is used. Move ipv6only into struct sock_common so that it is available at no extra cost in lookups. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/ipv6.h')
-rw-r--r--include/linux/ipv6.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index b0f2452f1d58..5dc68c3ebcbd 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -194,7 +194,7 @@ struct ipv6_pinfo {
sndflow:1,
repflow:1,
pmtudisc:3,
- ipv6only:1,
+ padding:1, /* 1 bit hole */
srcprefs:3, /* 001: prefer temporary address
* 010: prefer public address
* 100: prefer care-of address
@@ -273,8 +273,8 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
}
-#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
-#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
+#define __ipv6_only_sock(sk) (sk->sk_ipv6only)
+#define ipv6_only_sock(sk) (__ipv6_only_sock(sk))
#define ipv6_sk_rxinfo(sk) ((sk)->sk_family == PF_INET6 && \
inet6_sk(sk)->rxopt.bits.rxinfo)
@@ -287,8 +287,8 @@ static inline const struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
static inline int inet_v6_ipv6only(const struct sock *sk)
{
- return likely(sk->sk_state != TCP_TIME_WAIT) ?
- ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
+ /* ipv6only field is at same position for timewait and other sockets */
+ return ipv6_only_sock(sk);
}
#else
#define __ipv6_only_sock(sk) 0