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. > Thanks, that helps clarify things a bit, but which xarray were you > talking about That was something that was replacing the list lookup: http://lists.infradead.org/pipermail/linux-nvme/2020-July/018242.html