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pkt_sched: Use qdisc->ops->peek() instead of ->dequeue() & ->requeue()

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Use qdisc->ops->peek() instead of ->dequeue() & ->requeue() pair.
After this patch the only remaining user of qdisc->ops->requeue() is
netem_enqueue(). Based on ideas of Herbert Xu, Patrick McHardy and
David S. Miller.

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 00:46:19 -07:00
committed by David S. Miller
parent 8e3af97899
commit 03c05f0d4b
4 changed files with 19 additions and 29 deletions
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12
net/sched/sch_tbf.c
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@@ -169,7 +169,7 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
struct tbf_sched_data *q = qdisc_priv(sch);
struct sk_buff *skb;
skb = q->qdisc->dequeue(q->qdisc);
skb = q->qdisc->ops->peek(q->qdisc);
if (skb) {
psched_time_t now;
@@ -192,6 +192,10 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
toks -= L2T(q, len);
if ((toks|ptoks) >= 0) {
skb = q->qdisc->dequeue(q->qdisc);
if (unlikely(!skb))
return NULL;
q->t_c = now;
q->tokens = toks;
q->ptokens = ptoks;
@@ -214,12 +218,6 @@ static struct sk_buff *tbf_dequeue(struct Qdisc* sch)
(cf. CSZ, HPFQ, HFSC)
*/
if (q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS) {
/* When requeue fails skb is dropped */
qdisc_tree_decrease_qlen(q->qdisc, 1);
sch->qstats.drops++;
}
sch->qstats.overlimits++;
}
return NULL;