linux-kernel - Re: [PATCH V10 0/6] mdev based hardware virtio offloading support

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Message-ID: <20191106151635.0d1cb3bc.cohuck@redhat.com>
Date:   Wed, 6 Nov 2019 15:16:35 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
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Subject: Re: [PATCH V10 0/6] mdev based hardware virtio offloading support

On Wed,  6 Nov 2019 21:35:25 +0800
Jason Wang <jasowang@...hat.com> wrote:

> Hi all:
> 
> There are hardwares that can do virtio datapath offloading while
> having its own control path. This path tries to implement a mdev based
> unified API to support using kernel virtio driver to drive those
> devices. This is done by introducing a new mdev transport for virtio
> (virtio_mdev) and register itself as a new kind of mdev driver. Then
> it provides a unified way for kernel virtio driver to talk with mdev
> device implementation.
> 
> Though the series only contains kernel driver support, the goal is to
> make the transport generic enough to support userspace drivers. This
> means vhost-mdev[1] could be built on top as well by resuing the
> transport.
> 
> A sample driver is also implemented which simulate a virito-net
> loopback ethernet device on top of vringh + workqueue. This could be
> used as a reference implementation for real hardware driver.
> 
> Also a real IFC VF driver was also posted here[2] which is a good
> reference for vendors who is interested in their own virtio datapath
> offloading product.
> 
> Consider mdev framework only support VFIO device and driver right now,
> this series also extend it to support other types. This is done
> through introducing class id to the device and pairing it with
> id_talbe claimed by the driver. On top, this seris also decouple
> device specific ops out of the common ones for implementing class
> specific operations over mdev bus.
> 
> Pktgen test was done with virito-net + mvnet loop back device.
> 
> Please review.

All looking good to me now.

> 
> [1] https://lkml.org/lkml/2019/11/5/424
> [2] https://lkml.org/lkml/2019/11/5/227