netdev - Re: net_sched: dsmark: use qdisc_dequeue

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Message-ID: <56D6FF02.7060003@cogentembedded.com>
Date:	Wed, 2 Mar 2016 17:56:02 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Kyeong Yoo <Kyeong.Yoo@...iedtelesis.co.nz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: net_sched: dsmark: use qdisc_dequeue_peeked()

Hello.

On 3/2/2016 7:10 AM, Kyeong Yoo wrote:

> This fix is for dsmark similar to 3557619f0f6f7496ed453d4825e24958ab1884e0,

    scripts/checkpatch.pl now enforces certain commit citing format, yours 
doesn't match it.

> 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.
>
> Also replaced dsmark peek to use qdisc_peek_dequeued() which works correctly
> if previously peeked skb still exists.
>
> Signed-off-by: Kyeong Yoo <kyeong.yoo@...iedtelesis.co.nz>

[...]

MBR, Sergei