netdev - Re: [PATCH 3/6] pkt_sched: sch_generic: Add generic qdisc->ops->peek() implementation.

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Message-ID: <48F73782.1090003@trash.net>
Date:	Thu, 16 Oct 2008 14:45:54 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH 3/6] pkt_sched: sch_generic: Add generic	qdisc->ops->peek()
 implementation.

Jarek Poplawski wrote:
> On Thu, Oct 16, 2008 at 02:19:37PM +0200, Patrick McHardy wrote:
>> Jarek Poplawski wrote:
>>> pkt_sched: sch_generic: Add generic qdisc->ops->peek() implementation.
>>>
>>> +	if (qops->peek == NULL)
>>> +		qops->peek = noop_qdisc_ops.peek;
>>>  	if (qops->dequeue == NULL)
>>>  		qops->dequeue = noop_qdisc_ops.dequeue;
>> ->dequeue and ->peek are somewhat tied together, so I think we should
>> only use the noop variants if both are unset. Whether this should be
>> checked here of before merging new qdiscs is a different question of
>> course :)
> 
> Actually, there is much less users of ->peek. Do you mean to always check
> for NULL before using? It was meant mainly for these non-work-conserving
> qdisc in case patch 6/6 isn't merged. Of course, IMHO it should be enough
> to implement this always (while merging), but this code above could be
> misleading what is optional/mandatory. (Please make it clear which way do
> you prefer and I'll redo, no problem.)

No, I meant that peek = noop_qdisc_ops.peek and dequeue = something_else
doesn't make much sense. But I think declaring this an API usage error
and catching it during review is fine.
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