From: Manish Kurup <kurup.manish@gmail.com>
Date: Tue, 7 Nov 2017 15:48:15 -0500
Subject: act_vlan: Change stats update to use per-core stats
Patch-mainline: v4.15-rc1
Git-commit: e0496cbbf8fb5d831e74b8cedb54236a49413679
References: bsc#1109837

The VLAN action maintains one set of stats across all cores, and uses a
spinlock to synchronize updates to it from the same. Changed this to use a
per-CPU stats context instead.
This change will result in better performance.

Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Manish Kurup <manish.kurup@verizon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/sched/act_vlan.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/net/sched/act_vlan.c
+++ b/net/sched/act_vlan.c
@@ -30,9 +30,10 @@ static int tcf_vlan(struct sk_buff *skb,
 	int err;
 	u16 tci;
 
-	spin_lock(&v->tcf_lock);
 	tcf_lastuse_update(&v->tcf_tm);
-	bstats_update(&v->tcf_bstats, skb);
+	bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb);
+
+	spin_lock(&v->tcf_lock);
 	action = v->tcf_action;
 
 	/* Ensure 'data' points at mac_header prior calling vlan manipulating
@@ -85,7 +86,8 @@ static int tcf_vlan(struct sk_buff *skb,
 
 drop:
 	action = TC_ACT_SHOT;
-	v->tcf_qstats.drops++;
+	qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats));
+
 unlock:
 	if (skb_at_tc_ingress(skb))
 		skb_pull_rcsum(skb, skb->mac_len);
@@ -172,7 +174,7 @@ static int tcf_vlan_init(struct net *net
 
 	if (!exists) {
 		ret = tcf_idr_create(tn, parm->index, est, a,
-				     &act_vlan_ops, bind, false);
+				     &act_vlan_ops, bind, true);
 		if (ret)
 			return ret;