netdev - [PATCH net-next v2 1/2] net/sched: skbedit: use per-cpu counters

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Message-Id: <fe87d58f13659f2723e8a0f45e7ef6d8e22ddde9.1531315251.git.dcaratti@redhat.com>
Date:   Wed, 11 Jul 2018 16:04:49 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next v2 1/2] net/sched: skbedit: use per-cpu counters

use per-CPU counters, instead of sharing a single set of stats with all
cores: this removes the need of spinlocks when stats are read/updated.

Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 net/sched/act_skbedit.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index 86521a74ecdd..8651b5bd6b59 100644
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -38,10 +38,10 @@ static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
 {
 	struct tcf_skbedit *d = to_skbedit(a);
 
-	spin_lock(&d->tcf_lock);
 	tcf_lastuse_update(&d->tcf_tm);
-	bstats_update(&d->tcf_bstats, skb);
+	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
 
+	spin_lock(&d->tcf_lock);
 	if (d->flags & SKBEDIT_F_PRIORITY)
 		skb->priority = d->priority;
 	if (d->flags & SKBEDIT_F_INHERITDSFIELD) {
@@ -77,8 +77,8 @@ static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
 	return d->tcf_action;
 
 err:
-	d->tcf_qstats.drops++;
 	spin_unlock(&d->tcf_lock);
+	qstats_drop_inc(this_cpu_ptr(d->common.cpu_qstats));
 	return TC_ACT_SHOT;
 }
 
@@ -169,7 +169,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 
 	if (!exists) {
 		ret = tcf_idr_create(tn, parm->index, est, a,
-				     &act_skbedit_ops, bind, false);
+				     &act_skbedit_ops, bind, true);
 		if (ret) {
 			tcf_idr_cleanup(tn, parm->index);
 			return ret;
-- 
2.17.1