[RFC PATCH v2 09/10] net: sched: helper to sum qlen

[John Fastabend <john.fastabend@gmail.com>]

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@intel.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 149f079..d370fee 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -271,6 +271,21 @@ 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;