sched: act_vlan: implement stats_update callback

Implement this callback in order to get the offloaded stats added to the
kernel stats.
Reported-by: Pengfei Liu <pengfeil@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/act_vlan.c

@@ -301,6 +301,19 @@ static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
 	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 }
 
+static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u32 packets,
+				  u64 lastuse, bool hw)
+{
+	struct tcf_vlan *v = to_vlan(a);
+	struct tcf_t *tm = &v->tcf_tm;
+
+	_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
+	if (hw)
+		_bstats_cpu_update(this_cpu_ptr(a->cpu_bstats_hw),
+				   bytes, packets);
+	tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, vlan_net_id);
@@ -325,6 +338,7 @@ static struct tc_action_ops act_vlan_ops = {
 	.init		=	tcf_vlan_init,
 	.cleanup	=	tcf_vlan_cleanup,
 	.walk		=	tcf_vlan_walker,
+	.stats_update	=	tcf_vlan_stats_update,
 	.get_fill_size	=	tcf_vlan_get_fill_size,
 	.lookup		=	tcf_vlan_search,
 	.size		=	sizeof(struct tcf_vlan),