linux-kernel - Re: [PATCH V8 0/6] mdev based hardware virtio offloading support

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Message-ID: <20191105105834.469675f0@x1.home>
Date:   Tue, 5 Nov 2019 10:58:34 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
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Subject: Re: [PATCH V8 0/6] mdev based hardware virtio offloading support

On Tue,  5 Nov 2019 17:32:34 +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 ICF 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 parents ops out of the common ones.
> 
> Pktgen test was done with virito-net + mvnet loop back device.
> 
> Please review.
> 
> [1] https://lkml.org/lkml/2019/10/31/440
> [2] https://lkml.org/lkml/2019/10/15/1226
> 
> Changes from V7:
> - drop {set|get}_mdev_features for virtio
> - typo and comment style fixes


Seems we're nearly there, all the remaining comments are relatively
superficial, though I would appreciate a v9 addressing them as well as
the checkpatch warnings:

https://patchwork.freedesktop.org/series/68977/

Consider this a last call for reviews or acks (or naks) from affected
mdev vendor drivers, mdev-core sub-maintainers (Hi Kirti), virtio
stakeholders, etc.  Thanks,

Alex