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authorJarek Poplawski <jarkao2@gmail.com>2008-10-31 00:46:19 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-31 00:46:19 -0700
commit03c05f0d4bb0c267edf12d614025a40e33c5a6f9 (patch)
treec23b79ed8b7dfcdabb872f5c114541ae2de8ac0f /net/sched/sch_netem.c
parent8e3af97899db433111287e07d5105189f56fe191 (diff)
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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>
Diffstat (limited to 'net/sched/sch_netem.c')
-rw-r--r--net/sched/sch_netem.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 2898d9dc31e..74fbdb52bae 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -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);
}