path: root/net/sched/sch_netem.c
diff options
authorJarek Poplawski <jarkao2@gmail.com>2008-10-31 00:47:01 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-31 00:47:01 -0700
commit77be155cba4e163e8bba9fd27222a8b6189ec4f7 (patch)
tree0819d4c0bb760080aaba8a00060a774205914034 /net/sched/sch_netem.c
parent03c05f0d4bb0c267edf12d614025a40e33c5a6f9 (diff)
pkt_sched: Add peek emulation for non-work-conserving qdiscs.
This patch adds qdisc_peek_dequeued() wrapper to emulate peek method with qdisc->dequeue() and storing "peeked" skb in qdisc->gso_skb until dequeuing. This is mainly for compatibility reasons not to break some strange configs because peeking is expected for non-work-conserving parent qdiscs to query work-conserving child qdiscs. This implementation requires using qdisc_dequeue_peeked() wrapper instead of directly calling qdisc->dequeue() for all qdiscs ever querried with qdisc->ops->peek() or qdisc_peek_dequeued(). Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_netem.c')
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 74fbdb52bae..3080bd6ee33 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -290,8 +290,8 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
/* if more time remaining? */
if (cb->time_to_send <= now) {
- skb = q->qdisc->dequeue(q->qdisc);
- if (!skb)
+ skb = qdisc_dequeue_peeked(q->qdisc);
+ if (unlikely(!skb))
return NULL;
pr_debug("netem_dequeue: return skb=%p\n", skb);
@@ -714,6 +714,7 @@ static struct Qdisc_ops netem_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct netem_sched_data),
.enqueue = netem_enqueue,
.dequeue = netem_dequeue,
+ .peek = qdisc_peek_dequeued,
.requeue = netem_requeue,
.drop = netem_drop,
.init = netem_init,