Re: [RFC PATCH 1/4] Add a new API to virtio-pci

Michael S. Tsirkin
2010-09-15T05:35:29Z

On Mon, Sep 13, 2010 at 07:00:51PM +0200, Avi Kivity wrote:
> On 09/13/2010 06:30 PM, Michael S. Tsirkin wrote:
> >Trouble is, each vhost-net device is associated with 1 tun/tap
> >device which means that each vhost-net device is associated with a
> >transmit and receive queue.
> >
> >I don't know if you'll always have an equal number of transmit and
> >receive queues but there's certainly challenge in terms of
> >flexibility with this model.
> >
> >Regards,
> >
> >Anthony Liguori
> >Not really, TX and RX can be mapped to different devices,
> >or you can only map one of these. What is the trouble?
>
> Suppose you have one multiqueue-capable ethernet card. How can you
> connect it to multiple rx/tx queues?
> tx is in principle doable, but what about rx?
>
> What does "only map one of these" mean? Connect the device with one
> queue (presumably rx), and terminate the others?
>
>
> Will packet classification work (does the current multiqueue
> proposal support it)?
>

This is a non trivial problem, but
this needs to be handled in tap, not in vhost net.
If tap gives you multiple queues, vhost-net will happily
let you connect vqs to these.

>
> --
> error compiling committee.c: too many arguments to function
>
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