Re: Re: [virtio-comment] About adding a new device type virtio-nvme

[Stefan Hajnoczi <stefanha@redhat.com>]

On Thu, Jan 19, 2023 at 05:03:38PM +0800, äèä wrote:
> Wed, 18 Jan 2023 09:14:41 -0500, Stefan wrote:
> 
> >On Wed, Jan 18, 2023 at 10:15:12AM +0800, äèä wrote:
> 
> >> On Tue, 17 Jan 2023 10:34:09 -0500, Stefan wrote:
> 
> >> >On Tue, Jan 17, 2023 at 05:41:57PM +0800, äèä wrote:
> 
> >> >> On Tue, 17 Jan 2023 09:32:05 +0100ïDavid wroteï
> 
> >> >> >On 17.01.23 03:04, äèä wrote:
> 
> >> >The two diagrams are quite similar. Did you want to highlight a
> 
> >>
> 
> >> >difference between the two approaches in the diagram?
> 
> >>
> 
> >> The biggest difference is the VFIO and vDPA frameworks. The vDPA (virtio data path acceleration) kernel framework
> 
> >> is a pillar in productizing the end-to-end vDPA solution and it enables NIC vendors to integrate their vDPA NIC kernel
> 
> >> drivers into the framework as part of their productization efforts.Â
> 
> >> Detailed information referenceïhttps://www.redhat.com/en/blog/introduction-vdpa-kernel-framework
> 
> Â
> 
> >For the sake of the argument, let's assume VFIO can't be used in your
> 
> >situation so vDPA is required. The part I don't understand is which
> 
> >specific NVMe features you need that virtio-blk lacks?
> 
> 
> 
> During the DPU chip design process, "Fabrics connect" commands are not supported on standard nvme-pci devices,
> but I can be delivered to remote storage at the back-end of the nvme-pci device.
> 
> In the case of a virtio-blk device, I am not clear how the back-end of virtio-blk connects to remote storage.Although
> NVIDIA claims to support virtio-blk SNAP (Software-defined Network Accelerated Processing), their implementation
> is not expected to be an open source standard, other vendors may have developed based on proprietary specifications.
>
> All of this is from a hardware offloading perspective. There are two solutions to the problem I'm facing:

Wait, what is the problem you are facing? Why do you need NVMe?

> 1) virtio combines nvme, add a new virtio-nvme device.
> 2) virtio-blk Adds Fabrics related commands to enable virtio-blk to support Virtio-blk-of (over Fabric).
> 
>

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