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ipsec: pfkey should ignore events when no listeners

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When pfkey has no km listeners, it still does a lot of work
before finding out there aint nobody out there.
If a tree falls in a forest and no one is around to hear it, does it make
a sound? In this case it makes a lot of noise:
With this short-circuit adding 10s of thousands of SAs using
netlink improves performance by ~10%.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2008-06-10 14:25:34 -07:00 committed by David S. Miller
parent bc6cffd177
commit 99c6f60e72
1 changed files with 3 additions and 0 deletions
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3
net/key/af_key.c
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@ -3030,6 +3030,9 @@ static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
{ {
if (atomic_read(&pfkey_socks_nr) == 0)
return 0;
switch (c->event) { switch (c->event) {
case XFRM_MSG_EXPIRE: case XFRM_MSG_EXPIRE:
return key_notify_sa_expire(x, c); return key_notify_sa_expire(x, c);