pkt_sched: Add qdisc->ops->peek() implementation.

Add qdisc->ops->peek() implementation for work-conserving qdiscs.
With feedback from Patrick McHardy.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index ba43aab3a851..3e491479ea86 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -313,6 +313,15 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
         return skb;
 }
 
+static struct sk_buff *dsmark_peek(struct Qdisc *sch)
+{
+        struct dsmark_qdisc_data *p = qdisc_priv(sch);
+
+        pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
+
+        return p->q->ops->peek(p->q);
+}
+
 static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
 {
         struct dsmark_qdisc_data *p = qdisc_priv(sch);
@@ -496,6 +505,7 @@ static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
         .priv_size      =       sizeof(struct dsmark_qdisc_data),
         .enqueue        =       dsmark_enqueue,
         .dequeue        =       dsmark_dequeue,
+        .peek           =       dsmark_peek,
         .requeue        =       dsmark_requeue,
         .drop           =       dsmark_drop,
         .init           =       dsmark_init,