linux-kernel - Re: [RFC] vhost_mdev: add network control vq support

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Message-ID: <39aa9f66-8e58-ea63-5795-7df8861ff3a0@redhat.com>
Date:   Wed, 30 Oct 2019 15:04:37 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>
Cc:     mst@...hat.com, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        dan.daly@...el.com, cunming.liang@...el.com,
        zhihong.wang@...el.com, lingshan.zhu@...el.com
Subject: Re: [RFC] vhost_mdev: add network control vq support


On 2019/10/30 下午2:17, Tiwei Bie wrote:
> On Tue, Oct 29, 2019 at 06:51:32PM +0800, Jason Wang wrote:
>> On 2019/10/29 下午6:17, Tiwei Bie wrote:
>>> This patch adds the network control vq support in vhost-mdev.
>>> A vhost-mdev specific op is introduced to allow parent drivers
>>> to handle the network control commands come from userspace.
>> Probably work for userspace driver but not kernel driver.
> Exactly. This is only for userspace.
>
> I got your point now. In virtio-mdev kernel driver case,
> the ctrl-vq can be special as well.
>

Then maybe it's better to introduce vhost-mdev-net on top?

Looking at the other type of virtio device:

- console have two control virtqueues when multiqueue port is enabled

- SCSI has controlq + eventq

- GPU has controlq

- Crypto device has one controlq

- Socket has eventq

...

Thanks