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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
net/sched/sch_atm.c
View File

@ -480,11 +480,14 @@ static void sch_atm_dequeue(unsigned long data)
* If traffic is properly shaped, this won't generate nasty
* little bursts. Otherwise, it may ... (but that's okay)
*/
while ((skb = flow->q->dequeue(flow->q))) {
if (!atm_may_send(flow->vcc, skb->truesize)) {
(void)flow->q->ops->requeue(skb, flow->q);
while ((skb = flow->q->ops->peek(flow->q))) {
if (!atm_may_send(flow->vcc, skb->truesize))
break;
}
skb = flow->q->dequeue(flow->q);
if (unlikely(!skb))
break;
pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
/* remove any LL header somebody else has attached */
skb_pull(skb, skb_network_offset(skb));

12
net/sched/sch_hfsc.c
View File

@ -880,28 +880,20 @@ set_passive(struct hfsc_class *cl)
*/
}
/*
* hack to get length of first packet in queue.
*/
static unsigned int
qdisc_peek_len(struct Qdisc *sch)
{
struct sk_buff *skb;
unsigned int len;
skb = sch->dequeue(sch);
skb = sch->ops->peek(sch);
if (skb == NULL) {
if (net_ratelimit())
printk("qdisc_peek_len: non work-conserving qdisc ?\n");
return 0;
}
len = qdisc_pkt_len(skb);
if (unlikely(sch->ops->requeue(skb, sch) != NET_XMIT_SUCCESS)) {
if (net_ratelimit())
printk("qdisc_peek_len: failed to requeue\n");
qdisc_tree_decrease_qlen(sch, 1);
return 0;
}
return len;
}

13
net/sched/sch_netem.c
View File

@ -283,25 +283,22 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
if (sch->flags & TCQ_F_THROTTLED)
return NULL;
skb = q->qdisc->dequeue(q->qdisc);
skb = q->qdisc->ops->peek(q->qdisc);
if (skb) {
const struct netem_skb_cb *cb = netem_skb_cb(skb);
psched_time_t now = psched_get_time();
/* if more time remaining? */
if (cb->time_to_send <= now) {
skb = q->qdisc->dequeue(q->qdisc);
if (!skb)
return NULL;
pr_debug("netem_dequeue: return skb=%p\n", skb);
sch->q.qlen--;
return skb;
}
if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) {
qdisc_tree_decrease_qlen(q->qdisc, 1);
sch->qstats.drops++;
printk(KERN_ERR "netem: %s could not requeue\n",
q->qdisc->ops->id);
}
qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send);
}

12
net/sched/sch_tbf.c
View File

@ -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;