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>

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 9bba7ac..7470e36 100644 (file)
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -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);