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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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/ipv6.h
View File

@ -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

3
include/net/inet_timewait_sock.h
View File

@ -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 */

4
include/net/sock.h
View File

@ -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

4
net/dccp/minisocks.c
View File

@ -55,11 +55,9 @@ void dccp_time_wait(struct sock *sk, int state, int timeo)
const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1);
#if IS_ENABLED(CONFIG_IPV6)
if (tw->tw_family == PF_INET6) {
const struct ipv6_pinfo *np = inet6_sk(sk);
tw->tw_v6_daddr = sk->sk_v6_daddr;
tw->tw_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
tw->tw_ipv6only = np->ipv6only;
tw->tw_ipv6only = sk->sk_ipv6only;
}
#endif
/* Linkage updates. */

2
net/ipv4/tcp_minisocks.c
View File

@ -298,7 +298,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
tw->tw_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
tw->tw_tclass = np->tclass;
tw->tw_flowlabel = np->flow_label >> 12;
tw->tw_ipv6only = np->ipv6only;
tw->tw_ipv6only = sk->sk_ipv6only;
}
#endif

6
net/ipv6/af_inet6.c
View File

@ -197,7 +197,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
np->mc_loop = 1;
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->ipv6only = net->ipv6.sysctl.bindv6only;
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
@ -294,7 +294,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
/* Binding to v4-mapped address on a v6-only socket
* makes no sense
*/
if (np->ipv6only) {
if (sk->sk_ipv6only) {
err = -EINVAL;
goto out;
}
@ -371,7 +371,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (addr_type != IPV6_ADDR_ANY) {
sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
if (addr_type != IPV6_ADDR_MAPPED)
np->ipv6only = 1;
sk->sk_ipv6only = 1;
}
if (snum)
sk->sk_userlocks |= SOCK_BINDPORT_LOCK;

4
net/ipv6/ipv6_sockglue.c
View File

@ -235,7 +235,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
if (optlen < sizeof(int) ||
inet_sk(sk)->inet_num)
goto e_inval;
np->ipv6only = valbool;
sk->sk_ipv6only = valbool;
retv = 0;
break;
@ -1058,7 +1058,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
}
case IPV6_V6ONLY:
val = np->ipv6only;
val = sk->sk_ipv6only;
break;
case IPV6_RECVPKTINFO:

3
net/ipv6/udp.c
View File

@ -79,7 +79,6 @@ static unsigned int udp6_ehashfn(struct net *net,
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
{
const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
int sk_ipv6only = ipv6_only_sock(sk);
int sk2_ipv6only = inet_v6_ipv6only(sk2);
int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
@ -95,7 +94,7 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
return 1;
if (addr_type == IPV6_ADDR_ANY &&
!(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
!(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
return 1;
if (sk2_rcv_saddr6 &&