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

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Date:	Mon, 7 Sep 2009 20:22:20 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org
Subject: Re: net_sched 07/07: add classful multiqueue dummy scheduler

On Mon, Sep 07, 2009 at 03:27:37PM +0200, Patrick McHardy wrote:
> Jarek Poplawski wrote:
...
> >> @@ -1095,10 +1100,16 @@ create_n_graft:
> >>  		q = qdisc_create(dev, &dev->rx_queue,
> >>  				 tcm->tcm_parent, tcm->tcm_parent,
> >>  				 tca, &err);
> >> -	else
> >> -		q = qdisc_create(dev, netdev_get_tx_queue(dev, 0),
> >> +	else {
> >> +		unsigned int ntx = 0;
> >> +
> >> +		if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
> >> +			ntx = p->ops->cl_ops->select_queue(p, tcm);
> > 
> > So, this if could be probably made shorter with a common function, but
> > the main point is: this probably works only for qdiscs having mq as a
> > parent, and not below.
> 
> Yes. mq can only be attached to the root however, so its not
> possible to use it as a child qdisc.

I mean this ->select_queue() works OK for a child qdisc of mq, e.g.
htb, but not for a child qdisc of this htb qdisc, e.g. sfq.

Jarek P.
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