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

John Fastabend
2015-12-30T17:52:44Z

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@intel.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);