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pkt_sched: Add peek emulation for non-work-conserving qdiscs.

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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>
This commit is contained in:
Jarek Poplawski
2008-10-31 00:47:01 -07:00
committed by David S. Miller
parent 03c05f0d4b
commit 77be155cba
7 changed files with 34 additions and 6 deletions
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net/sched/sch_tbf.c
+2 -1
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@@ -192,7 +192,7 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
toks -= L2T(q, len);
if ((toks|ptoks) >= 0) {
skb = q->qdisc->dequeue(q->qdisc);
skb = qdisc_dequeue_peeked(q->qdisc);
if (unlikely(!skb))
return NULL;
@@ -467,6 +467,7 @@ static struct Qdisc_ops tbf_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct tbf_sched_data),
.enqueue = tbf_enqueue,
.dequeue = tbf_dequeue,
.peek = qdisc_peek_dequeued,
.requeue = tbf_requeue,
.drop = tbf_drop,
.init = tbf_init,