netdev - Re: [RFC] multiqueue changes

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Date:	Fri, 9 Oct 2009 08:51:07 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC] multiqueue changes

On Thu, Oct 08, 2009 at 09:03:44AM +0000, Jarek Poplawski wrote:
> On Thu, Oct 08, 2009 at 09:18:45AM +0200, Eric Dumazet wrote:
...
> > Just wondering if it could hurt some people.
> > 
> > Anyway, should we change bnx2/tg3 drivers so that single queue devices
> > have same default qdisc/class than before ?
> > 
> > eg :
> > 
> > diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
> > index 08cddb6..7cac205 100644
> > --- a/drivers/net/bnx2.c
> > +++ b/drivers/net/bnx2.c
> > @@ -6152,6 +6152,7 @@ bnx2_setup_int_mode(struct bnx2 *bp, int dis_msi)
> >  
> >  	bp->num_tx_rings = rounddown_pow_of_two(bp->irq_nvecs);
> >  	bp->dev->real_num_tx_queues = bp->num_tx_rings;
> > +	bp->dev->num_tx_queues = bp->dev->real_num_tx_queues;
> >  
> >  	bp->num_rx_rings = bp->irq_nvecs;
> >  }
> 
> It doesn't look consistent to me wrt. the comment in netdevice.h on
> num_tx_queues. But it seems we should rather use more often
> real_num_tx_queue in schedulers code like dumps and maybe more
> (like e.g. sch_multiq does).

So, according to my current understanding, we should probably let
drivers to reset the tx_queues allocation with a new num_tx_queues
in a place like this (ndo_open).

Jarek P.
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