netdev - Re: [PATCH 2/5] virtio_net: Add a virtqueue for outbound control commands

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Message-Id: <1232357564.5627.17.camel@blaa>
Date:	Mon, 19 Jan 2009 09:32:44 +0000
From:	Mark McLoughlin <markmc@...hat.com>
To:	Alex Williamson <alex.williamson@...com>
Cc:	netdev@...r.kernel.org, rusty@...tcorp.com.au, kvm@...r.kernel.org
Subject: Re: [PATCH 2/5] virtio_net: Add a virtqueue for outbound control
 commands

On Fri, 2009-01-16 at 14:13 -0700, Alex Williamson wrote:
> This will be used for RX mode, MAC filter table, VLAN filtering, etc...
> 
> The control transaction consists of one or more "out" sg entries and
> one or more "in" sg entries.  The first out entry contains a header
> defining the class and command.  Additional out entries may provide
> data for the command.  The last in entry provides a status response
> back from the command.
> 
> Virtqueues typically run asynchronous, running a callback function
> when there's data in the channel.  We can't readily make use of this
> in the command paths where we need to use this.  Instead, we kick
> the virtqueue and spin.  The kick causes an I/O write, triggering an
> immediate trap into the hypervisor.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...com>

Acked-by: Mark McLoughlin <markmc@...hat.com>

Cheers,
Mark.

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