netdev - [RFC PATCH 04/12] net: sched: provide per cpu qstat helpers

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Date:	Wed, 30 Dec 2015 09:52:27 -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 04/12] net: sched: provide per cpu qstat helpers

The per cpu qstats support was added with per cpu bstat support
which is currently used by the ingress qdisc. This patch adds
a set of helpers needed to make other qdiscs that use qstats
per cpu as well.

Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 include/net/sch_generic.h |   39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index c8d42c3..9966c17 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -545,12 +545,43 @@ static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
 	sch->qstats.backlog -= qdisc_pkt_len(skb);
 }
 
+static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch,
+						const struct sk_buff *skb)
+{
+	struct gnet_stats_queue *q = this_cpu_ptr(sch->cpu_qstats);
+
+	q->backlog -= qdisc_pkt_len(skb);
+}
+
 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
 					    const struct sk_buff *skb)
 {
 	sch->qstats.backlog += qdisc_pkt_len(skb);
 }
 
+static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch,
+						const struct sk_buff *skb)
+{
+	struct gnet_stats_queue *q = this_cpu_ptr(sch->cpu_qstats);
+
+	q->backlog += qdisc_pkt_len(skb);
+}
+
+static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch)
+{
+	this_cpu_ptr(sch->cpu_qstats)->qlen++;
+}
+
+static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch)
+{
+	this_cpu_ptr(sch->cpu_qstats)->qlen--;
+}
+
+static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch)
+{
+	this_cpu_ptr(sch->cpu_qstats)->requeues++;
+}
+
 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
 {
 	sch->qstats.drops += count;
@@ -726,6 +757,14 @@ static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 	return NET_XMIT_DROP;
 }
 
+static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch)
+{
+	kfree_skb(skb);
+	qdisc_qstats_cpu_drop(sch);
+
+	return NET_XMIT_DROP;
+}
+
 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
 {
 	qdisc_qstats_drop(sch);

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