netdev - [RFC PATCH 10/12] net: sched: helper to sum qlen

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Date:	Wed, 30 Dec 2015 09:54:44 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	daniel@...earbox.net, eric.dumazet@...il.com, jhs@...atatu.com,
	aduyck@...antis.com, brouer@...hat.com, davem@...emloft.net
Cc:	john.r.fastabend@...el.com, netdev@...r.kernel.org,
	john.fastabend@...il.com
Subject: [RFC PATCH 10/12] 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 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 30f4c60..2c57278 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -286,6 +286,21 @@ 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;

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