summaryrefslogtreecommitdiffstats
path: root/include/net/sock.h
diff options
context:
space:
mode:
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/sock.h
parent090cce42639c2c82bce2cc26a902e4c674c62882 (diff)
downloadlinux-9fe516ba3fb29b6f6a752ffd93342fdee500ec01.tar.gz
linux-9fe516ba3fb29b6f6a752ffd93342fdee500ec01.tar.bz2
linux-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 'include/net/sock.h')
-rw-r--r--include/net/sock.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/net/sock.h b/include/net/sock.h
index 173cae485de1..8d4c9473e7d7 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -181,7 +181,8 @@ struct sock_common {
unsigned short skc_family;
volatile unsigned char skc_state;
unsigned char skc_reuse:4;
- unsigned char skc_reuseport:4;
+ unsigned char skc_reuseport:1;
+ unsigned char skc_ipv6only:1;
int skc_bound_dev_if;
union {
struct hlist_node skc_bind_node;
@@ -317,6 +318,7 @@ struct sock {
#define sk_state __sk_common.skc_state
#define sk_reuse __sk_common.skc_reuse
#define sk_reuseport __sk_common.skc_reuseport
+#define sk_ipv6only __sk_common.skc_ipv6only
#define sk_bound_dev_if __sk_common.skc_bound_dev_if
#define sk_bind_node __sk_common.skc_bind_node
#define sk_prot __sk_common.skc_prot