netdev - Re: [RFC PATCH v2 10/10] ixgbe: Add support for set

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Date:	Wed, 16 Jan 2013 16:30:25 +0000
From:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"therbert@...gle.com" <therbert@...gle.com>,
	"ycai@...gle.com" <ycai@...gle.com>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [RFC PATCH v2 10/10] ixgbe: Add support for set_channels
 ethtool operation

On Wed, 2013-01-16 at 16:19 +0000, Ben Hutchings wrote:
> On Thu, 2013-01-10 at 10:58 -0800, Alexander Duyck wrote:
> > This change adds support for the ethtool set_channels operation.
> > 
> > Since the ixgbe driver has to support DCB as well as the other modes the
> > assumption I made here is that the number of channels in DCB modes refers
> > to the number of queues per traffic class, not the number of queues total.
> > 
> > Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> In DCB mode are there separate IRQs for the different classes?

Yes.  The Rx packet buffer is split into multiple packet buffers, one
for each online class.  After that, it's just queues assigned to the
packet buffers, and interrupts assigned however you want them to be.

Cheers,
-PJ