[RFC] Multi level NVMe stack

[Ming Lin]

On Thu, Jul 30, 2015 at 7:52 AM, Christoph Hellwig <hch at infradead.org> wrote:
> On Wed, Jul 29, 2015 at 04:55:18PM -0700, Ming Lin wrote:
>> I'm working on a virtio-nvme driver.
>> NVMe over Fabrics initiator will probably be available some time.
>>
>> I wonder does it make sense to have a multi level NVMe stack(similar as
>> SCSI). So we can re-use the NVMe core code.
>
> Hi Ming,
>
> I've put some work in for abstraction, see the work to submit the
> internal NVMe command through struct request.
>
> Once we actually get other transports we can split main data structures,
> and move the parts sitting above that abstraction out into a separate
> module.
>
> From both looking at the I/O code I'd prefer not to add any abstractions
> in the I/O code for.
>
> I'd suggest you prototype the code without big refactoring first,
> and then compare your implementation against the NVMe virtualization
> extensions from Google and check if it's worth it:
>
> http://lists.infradead.org/pipermail/linux-nvme/2014-July/001076.html

I'll prototype the code.

Thanks.