net/sched: act_ct: Offload only ASSURED connections

Short-lived connections increase the insertion rate requirements,
fill the offload table and provide very limited offload value since
they process a very small amount of packets. The ct ASSURED flag is
designed to filter short-lived connections for early expiration.

Offload connections when they are ESTABLISHED and ASSURED.

Signed-off-by: Chris Mi <[e-mail]>
Reviewed-by: Oz Shlomo <[e-mail]>
Reviewed-by: Roi Dayan <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/sched/act_ct.c

···
 {
 	bool tcp = false;
 
-	if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
+	if ((ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) ||
+	    !test_bit(IPS_ASSURED_BIT, &ct->status))
 		return;
 
 	switch (nf_ct_protonum(ct)) {