Author: Kyeong Yoo <kyeong....@alliedtelesis.co.nz>
net_sched: dsmark: use qdisc_dequeue_peeked()
This fix is for dsmark similar to commit 3557619f0f6f7496ed453d4825e249
("net_sched: prio: use qdisc_dequeue_peeked")
and makes use of qdisc_dequeue_peeked() instead of direct dequeue() call.
First time, wrr peeks dsmark, which will then peek into sfq.
sfq dequeues an skb and it's stored in sch->gso_skb.
Next time, wrr tries to dequeue from dsmark, which will call sfq dequeue
directly. This results skipping the previously peeked skb.
So changed dsmark dequeue to call qdisc_dequeue_peeked() instead to use
peeked skb if exists.
Signed-off-by: Kyeong Yoo <kyeong....@alliedtelesis.co.nz>
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index f357f34..b204472 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -281,7 +281,7 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
- skb = p->q->ops->dequeue(p->q);
+ skb = qdisc_dequeue_peeked(p->q);
if (skb == NULL)
return NULL;
On Wed, 2016-03-02 at 10:26 -0800, Cong Wang wrote:
> On Tue, Mar 1, 2016 at 8:10 PM, Kyeong Yoo
> <kyeong....@alliedtelesis.co.nz> wrote:
> > This fix is for dsmark similar to 3557619f0f6f7496ed453d4825e24958ab1884e0,
> > and makes use of qdisc_dequeue_peeked() instead of direct dequeue() call.
> >
> > First time, wrr peeks dsmark, which will then peek into sfq.
> > sfq dequeues an skb and it's stored in sch->gso_skb.
> > Next time, wrr tries to dequeue from dsmark, which will call sfq dequeue
> > directly. This results skipping the previously peeked skb.
> >
> > So changed dsmark dequeue to call qdisc_dequeue_peeked() instead to use
> > peeked skb if exists.
>
>
> This part looks reasonable to me.
>
> >
> > Also replaced dsmark peek to use qdisc_peek_dequeued() which works correctly
> > if previously peeked skb still exists.
>
>
> But not this part, since sfq already calls qdisc_peek_dequeued()?
