linux-kernel - Re: [PATCH net v2] net: sched: do not requeue a NULL skb

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Message-ID: <CAM_iQpXgP=-S364Bza5fU9nROXD9dYYcUbkEJtn59UcFHAOgXA@mail.gmail.com>
Date:	Mon, 11 Apr 2016 10:53:01 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Lars Persson <lars.persson@...s.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Lars Persson <larper@...s.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v2] net: sched: do not requeue a NULL skb

On Mon, Apr 11, 2016 at 8:17 AM, Lars Persson <lars.persson@...s.com> wrote:
>
>
> On 04/11/2016 04:22 PM, Eric Dumazet wrote:
>>
>> On Mon, 2016-04-11 at 15:38 +0200, Lars Persson wrote:
>>
>>> I though it would be prudent because the queue can be non-empty even for
>>> the case of skb=NULL. So should it be there in this patch, another patch
>>> or not at all ?
>>
>>
>> Then maybe change return code ?
>>
>> It seems strange that a validate_xmit_skb_list() failure stops the
>> __qdisc_run() loop but schedules another round.
>>
>>
>
> It was suggested by Cong Wang to return 0 in order to stop the loop. Do you
> guys agree that the loop should be stopped for such failures ? Then I will
> put the schedule call inside the if as you proposed earlier.

I don't see any reason why we should continue on failure. And, I didn't
suggest you to return reschedule it either. I was suggesting to just return
0 for skb == NULL case.