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?
See hctx_may_queue().