From cd961c2ca98efbe7d738ca8720673fc03538b2b1 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 15 Feb 2012 20:28:25 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/sched/sch_netem.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index e83d61ca78cab7..5da548fa7ae9d4 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -501,9 +501,8 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch) /* 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 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch) qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send); } -qdisc_dequeue: if (q->qdisc) { skb = q->qdisc->ops->dequeue(q->qdisc); if (skb)