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inet: move ipv6only in sock_common

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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>
This commit is contained in:
Eric Dumazet
2014-06-27 08:36:16 -07:00
committed by David S. Miller
parent 090cce4263
commit 9fe516ba3f
8 changed files with 18 additions and 18 deletions
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4
include/net/sock.h
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@@ -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