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, 8 insertions, 0 deletions

diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index d35ef059abb1..bf03e7fa1849 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -123,6 +123,13 @@ teql_dequeue(struct Qdisc* sch)
         return skb;
 }
 
+static struct sk_buff *
+teql_peek(struct Qdisc* sch)
+{
+        /* teql is meant to be used as root qdisc */
+        return NULL;
+}
+
 static __inline__ void
 teql_neigh_release(struct neighbour *n)
 {
@@ -433,6 +440,7 @@ static __init void teql_master_setup(struct net_device *dev)
 
         ops->enqueue    =       teql_enqueue;
         ops->dequeue    =       teql_dequeue;
+        ops->peek       =       teql_peek;
         ops->requeue    =       teql_requeue;
         ops->init       =       teql_qdisc_init;
         ops->reset      =       teql_reset;