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netem: fix dequeue 

commit 50612537e9 (netem: fix classful handling) added two errors in
netem_dequeue()

1) After checking skb at the head of tfifo queue for time constraints,
   it dequeues tail skb, thus adding unwanted reordering.

2) qdisc stats are updated twice per packet
   (one when packet dequeued from tfifo, once when delivered)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-02-15 20:28:25 +00:00 committed by David S. Miller
parent b01543dfe6
commit cd961c2ca9
1 changed files with 2 additions and 4 deletions
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6
net/sched/sch_netem.c
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@ -501,9 +501,8 @@ tfifo_dequeue:
/* if more time remaining? */
if (cb->time_to_send <= psched_get_time()) {
skb = qdisc_dequeue_tail(sch);
if (unlikely(!skb))
goto qdisc_dequeue;
__skb_unlink(skb, &sch->q);
sch->qstats.backlog -= qdisc_pkt_len(skb);
#ifdef CONFIG_NET_CLS_ACT
/*
@ -539,7 +538,6 @@ deliver:
qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send);
}
qdisc_dequeue:
if (q->qdisc) {
skb = q->qdisc->ops->dequeue(q->qdisc);
if (skb)