netdev - Re: net_sched 07/07: add classful multiqueue dummy scheduler

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Message-ID: <4AA563B4.1060003@gmail.com>
Date:	Mon, 07 Sep 2009 21:49:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: net_sched 07/07: add classful multiqueue dummy scheduler

Jarek Poplawski a écrit :
> On Mon, Sep 07, 2009 at 03:27:37PM +0200, Patrick McHardy wrote:
>> Jarek Poplawski wrote:
> ...
>>>> +static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
>>>> +{
>>>> +	struct net_device *dev = qdisc_dev(sch);
>>>> +	struct Qdisc *qdisc;
>>>> +	unsigned int ntx;
>>>> +
>>>> +	sch->q.qlen = 0;
>>>> +	memset(&sch->bstats, 0, sizeof(sch->bstats));
>>>> +	memset(&sch->qstats, 0, sizeof(sch->qstats));
>>>> +
>>>> +	for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
>>>> +		qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
>>>> +		spin_lock_bh(qdisc_lock(qdisc));
>>>> +		sch->q.qlen		+= qdisc->q.qlen;
>>>> +		sch->bstats.bytes	+= qdisc->bstats.bytes;
>>>> +		sch->bstats.packets	+= qdisc->bstats.packets;
>>>> +		sch->qstats.qlen	+= qdisc->qstats.qlen;
>>> Like in Christoph's case, we should probably use q.qlen instead.
>> Its done a few lines above. This simply sums up all members of qstats.
> 
> AFAICS these members are updated only in tc_fill_qdisc, starting from
> the root, so they might be not up-to-date at the moment, unless I miss
> something.
> 

Yes, we might need an q->ops->update_stats(struct Qdisc *sch) method, and
to recursively call it from mq_update_stats()

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