[NET_SCHED] sch_prio: class statistics printing enabled

This patch adds a dump_stats callback to enable
printing of basic statistics of prio classes.
(With help of Patrick McHardy).

Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 2567b4c96c1e..000e043ebd62 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -372,6 +372,20 @@ static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *
         return 0;
 }
 
+static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
+                                 struct gnet_dump *d)
+{
+        struct prio_sched_data *q = qdisc_priv(sch);
+        struct Qdisc *cl_q;
+
+        cl_q = q->queues[cl - 1];
+        if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 ||
+            gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
+                return -1;
+
+        return 0;
+}
+
 static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct prio_sched_data *q = qdisc_priv(sch);
@@ -414,6 +428,7 @@ static struct Qdisc_class_ops prio_class_ops = {
         .bind_tcf       =       prio_bind,
         .unbind_tcf     =       prio_put,
         .dump           =       prio_dump_class,
+        .dump_stats     =       prio_dump_class_stats,
 };
 
 static struct Qdisc_ops prio_qdisc_ops = {