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authorEric Dumazet <edumazet@google.com>2014-06-27 08:36:16 -0700
committerDavid S. Miller <davem@davemloft.net>2014-07-01 23:46:21 -0700
commit9fe516ba3fb29b6f6a752ffd93342fdee500ec01 (patch)
tree4254ea02ed5d51d92fd7109d33d28bc95b8d3fb1 /include/net/inet_timewait_sock.h
parentMerge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next (diff)
downloadlinux-dev-9fe516ba3fb29b6f6a752ffd93342fdee500ec01.tar.xz
linux-dev-9fe516ba3fb29b6f6a752ffd93342fdee500ec01.zip
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 '')
-rw-r--r--include/net/inet_timewait_sock.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 61474ea02152..6c566034e26d 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -108,6 +108,7 @@ struct inet_timewait_sock {
#define tw_family __tw_common.skc_family
#define tw_state __tw_common.skc_state
#define tw_reuse __tw_common.skc_reuse
+#define tw_ipv6only __tw_common.skc_ipv6only
#define tw_bound_dev_if __tw_common.skc_bound_dev_if
#define tw_node __tw_common.skc_nulls_node
#define tw_bind_node __tw_common.skc_bind_node
@@ -131,7 +132,7 @@ struct inet_timewait_sock {
__be16 tw_sport;
kmemcheck_bitfield_begin(flags);
/* And these are ours. */
- unsigned int tw_ipv6only : 1,
+ unsigned int tw_pad0 : 1, /* 1 bit hole */
tw_transparent : 1,
tw_flowlabel : 20,
tw_pad : 2, /* 2 bits hole */