netdev - Re: [PATCH V6 6/6] docs: sample driver to demonstrate how to implement virtio-mdev framework

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Date:   Thu, 31 Oct 2019 15:57:38 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Christoph Hellwig <hch@...radead.org>,
        Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org, kwankhede@...dia.com,
        alex.williamson@...hat.com, mst@...hat.com, tiwei.bie@...el.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        cohuck@...hat.com, maxime.coquelin@...hat.com,
        cunming.liang@...el.com, zhihong.wang@...el.com,
        rob.miller@...adcom.com, xiao.w.wang@...el.com,
        haotian.wang@...ive.com, zhenyuw@...ux.intel.com,
        zhi.a.wang@...el.com, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        airlied@...ux.ie, daniel@...ll.ch, farman@...ux.ibm.com,
        pasic@...ux.ibm.com, sebott@...ux.ibm.com, oberpar@...ux.ibm.com,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, akrowiak@...ux.ibm.com,
        freude@...ux.ibm.com, idos@...lanox.com, eperezma@...hat.com,
        lulu@...hat.com, parav@...lanox.com,
        christophe.de.dinechin@...il.com, kevin.tian@...el.com,
        stefanha@...hat.com
Subject: Re: [PATCH V6 6/6] docs: sample driver to demonstrate how to
 implement virtio-mdev framework


On 10/31/2019 5:23 AM, Christoph Hellwig wrote:
> On Wed, Oct 30, 2019 at 02:44:44PM +0800, Jason Wang wrote:
>> This sample driver creates mdev device that simulate virtio net device
>> over virtio mdev transport. The device is implemented through vringh
>> and workqueue. A device specific dma ops is to make sure HVA is used
>> directly as the IOVA. This should be sufficient for kernel virtio
>> driver to work.
>>
>> Only 'virtio' type is supported right now. I plan to add 'vhost' type
>> on top which requires some virtual IOMMU implemented in this sample
>> driver.
> Can we please submit a real driver for it?  A more or less useless
> sample driver doesn't really qualify for our normal kernel requirements
> that infrastructure should have a real user.

Hello Christoph,

I am working on a real hardware driver for it, it's called IFC, I have 
posted RFC V1 and will post RFC V2 soon.

Thanks,
BR
Zhu Lingshan