[PATCH v15 7/9] nvmet-passthru: Add passthru code to process commands

[Sagi Grimberg]

On 7/20/20 4:17 PM, Keith Busch wrote:
> On Mon, Jul 20, 2020 at 05:01:19PM -0600, Logan Gunthorpe wrote:
>> On 2020-07-20 4:35 p.m., Sagi Grimberg wrote:
>>
>>> passthru commands are in essence REQ_OP_DRV_IN/REQ_OP_DRV_OUT, which
>>> means that the driver shouldn't need the ns at all. So if you have a
>>> dedicated request queue (mapped to the I/O tagset), you don't need the
>>> ns->queue and we can lose the ns lookup altogether.
> 
> We still need a request_queue to dispatch the command. I guess you could
> make a generic one for the controller that isn't tied to a namespace,
> but we lose the fair shared tag allocation.

What do you mean fair shared tag allocation?