[XFRM]: Fix aevent timer.

Send aevent immediately if we have sent nothing since last timer and
this is the first packet.

Fixes a corner case when packet threshold is very high, the timer low
and a very low packet rate input which is bursty.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -143,6 +143,11 @@ struct xfrm_state
 	/* Replay detection state at the time we sent the last notification */
 	struct xfrm_replay_state preplay;
 
+	/* internal flag that only holds state for delayed aevent at the
+	 * moment
+	*/
+	u32			xflags;
+
 	/* Replay detection notification settings */
 	u32			replay_maxage;
 	u32			replay_maxdiff;
@@ -168,6 +173,9 @@ struct xfrm_state
 	void			*data;
 };
 
+/* xflags - make enum if more show up */
+#define XFRM_TIME_DEFER	1
+
 enum {
 	XFRM_STATE_VOID,
 	XFRM_STATE_ACQ,