netdev - Re: [PATCH net] xen-netback: bookkeep number of queues in our own module

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Date:	Mon, 23 Jun 2014 02:08:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Paul.Durrant@...rix.com
Cc:	wei.liu2@...rix.com, xen-devel@...ts.xen.org,
	netdev@...r.kernel.org, boris.ostrovsky@...cle.com,
	Ian.Campbell@...rix.com
Subject: Re: [PATCH net] xen-netback: bookkeep number of queues in our own
 module

From: Paul Durrant <Paul.Durrant@...rix.com>
Date: Mon, 23 Jun 2014 07:59:16 +0000

> Bear in mind that the original intention of the multi-queue patches
> was to allow the queue selection algorithm to be negotiated with the
> frontend (see
> http://lists.xen.org/archives/html/xen-devel/2013-06/msg02654.html). Particularly,
> if the frontend is Windows then netback will need to use a Toeplitz
> hash to steer traffic since this is stipulated by Microsoft's RSS
> (Receive Side Scaling) interfaces. So, IMO netback should always
> implement a select queue method, otherwise any (theoretical)
> algorithm change in __netdev_pick_tx() would be immediately imposed
> on frontends, possibly causing them to misbehave.

I do not think you are obligated to use Toeplitz or whatever scheme
the other side wants, especially if the user on the xen-netback side
asked for XPS or similar to be used.
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