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

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Date:   Thu, 7 Nov 2019 12:11:30 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
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        stefanha@...hat.com
Subject: Re: [PATCH V8 0/6] mdev based hardware virtio offloading support


On 2019/11/7 上午5:13, Alex Williamson wrote:
> On Wed, 6 Nov 2019 14:25:23 -0500
> "Michael S. Tsirkin" <mst@...hat.com> wrote:
>
>> On Wed, Nov 06, 2019 at 12:03:12PM -0700, Alex Williamson wrote:
>>> On Wed, 6 Nov 2019 11:56:46 +0800
>>> Jason Wang <jasowang@...hat.com> wrote:
>>>    
>>>> On 2019/11/6 上午1:58, Alex Williamson wrote:
>>>>> 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/
>>>>
>>>> Will do.
>>>>
>>>> Btw, do you plan to merge vhost-mdev patch on top? Or you prefer it to
>>>> go through Michael's vhost tree?
>>> I can include it if you wish.  The mdev changes are isolated enough in
>>> that patch that I wouldn't presume it, but clearly it would require
>>> less merge coordination to drop it in my tree.  Let me know.  Thanks,
>>>
>>> Alex
>> I'm fine with merging through your tree. If you do, feel free to
>> include
>>
>> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> AFAICT, it looks like we're expecting at least one more version of
> Tiwei's patch after V5, so it'd probably be best to provide the ack and
> go-ahead on that next version so there's no confusion.  Thanks,
>
> Alex


Yes, it's probably need a V6. Will give ack there.

Thanks