netdev - [RFC PATCH 09/13] net: sched: helper to sum qlen

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Message-ID: <20160817193714.27032.47575.stgit@john-Precision-Tower-5810>
Date:	Wed, 17 Aug 2016 12:37:14 -0700
From:	John Fastabend <john.fastabend@...il.com>
To:	xiyou.wangcong@...il.com, jhs@...atatu.com,
	alexei.starovoitov@...il.com, eric.dumazet@...il.com,
	brouer@...hat.com
Cc:	john.r.fastabend@...el.com, netdev@...r.kernel.org,
	john.fastabend@...il.com, davem@...emloft.net
Subject: [RFC PATCH 09/13] net: sched: helper to sum qlen

Reporting qlen when qlen is per cpu requires aggregating the per
cpu counters. This adds a helper routine for this.

Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 include/net/sch_generic.h |   15 +++++++++++++++
 net/sched/sch_api.c       |    3 ++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index d465fb9..cc28af0 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -280,6 +280,21 @@ static inline int qdisc_qlen(const struct Qdisc *q)
 	return q->q.qlen;
 }
 
+static inline int qdisc_qlen_sum(const struct Qdisc *q)
+{
+	__u32 qlen = 0;
+	int i;
+
+	if (q->flags & TCQ_F_NOLOCK) {
+		for_each_possible_cpu(i)
+			qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen;
+	} else {
+		qlen = q->q.qlen;
+	}
+
+	return qlen;
+}
+
 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 {
 	return (struct qdisc_skb_cb *)skb->cb;
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index b90a23a..6c5bf13 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1370,7 +1370,8 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
 		goto nla_put_failure;
 	if (q->ops->dump && q->ops->dump(q, skb) < 0)
 		goto nla_put_failure;
-	qlen = q->q.qlen;
+
+	qlen = qdisc_qlen_sum(q);
 
 	stab = rtnl_dereference(q->stab);
 	if (stab && qdisc_dump_stab(skb, stab) < 0)