Commit 99c6f60e authored Jun 10, 2008 by Jamal Hadi Salim Committed by David S. Miller Jun 10, 2008

ipsec: pfkey should ignore events when no listeners



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>

parent bc6cffd1

net/key/af_key.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{
		if (atomic_read(&pfkey_socks_nr) == 0)
		return 0;

		switch (c->event) {
		case XFRM_MSG_EXPIRE:
		return key_notify_sa_expire(x, c);