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net: optimize socket timestamping 

We can test/set multiple bits from sk_flags at once, to shorten a bit
socket setup/dismantle phase.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-11-28 12:04:18 +00:00 committed by David S. Miller
parent b90e5794c5
commit 08e29af3a9
1 changed files with 12 additions and 15 deletions
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27
net/core/sock.c
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@ -276,14 +276,14 @@ static void sock_warn_obsolete_bsdism(const char *name)
}
}
static void sock_disable_timestamp(struct sock *sk, int flag)
#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
{
if (sock_flag(sk, flag)) {
sock_reset_flag(sk, flag);
if (!sock_flag(sk, SOCK_TIMESTAMP) &&
!sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
if (sk->sk_flags & flags) {
sk->sk_flags &= ~flags;
if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP))
net_disable_timestamp();
}
}
}
@ -689,7 +689,7 @@ set_rcvbuf:
SOCK_TIMESTAMPING_RX_SOFTWARE);
else
sock_disable_timestamp(sk,
SOCK_TIMESTAMPING_RX_SOFTWARE);
(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
val & SOF_TIMESTAMPING_SOFTWARE);
sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
@ -1187,8 +1187,7 @@ static void __sk_free(struct sock *sk)
RCU_INIT_POINTER(sk->sk_filter, NULL);
}
sock_disable_timestamp(sk, SOCK_TIMESTAMP);
sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
if (atomic_read(&sk->sk_omem_alloc))
printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
@ -1326,8 +1325,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
if (newsk->sk_prot->sockets_allocated)
percpu_counter_inc(newsk->sk_prot->sockets_allocated);
if (sock_flag(newsk, SOCK_TIMESTAMP) ||
sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
net_enable_timestamp();
}
out:
@ -2165,16 +2163,15 @@ EXPORT_SYMBOL(sock_get_timestampns);
void sock_enable_timestamp(struct sock *sk, int flag)
{
if (!sock_flag(sk, flag)) {
unsigned long previous_flags = sk->sk_flags;
sock_set_flag(sk, flag);
/*
* we just set one of the two flags which require net
* time stamping, but time stamping might have been on
* already because of the other one
*/
if (!sock_flag(sk,
flag == SOCK_TIMESTAMP ?
SOCK_TIMESTAMPING_RX_SOFTWARE :
SOCK_TIMESTAMP))
if (!(previous_flags & SK_FLAGS_TIMESTAMP))
net_enable_timestamp();
}
}