On 6/4/19 10:23 AM, Christoph Hellwig wrote: > On Thu, May 30, 2019 at 07:14:14PM +0200, Hannes Reinecke wrote: >>> Is this really required? I would think that a non-zero value for >>> shost->nr_reserved_cmds means the same thing in practice. >>> ; >> My implementation actually allows for per-device reserved tags (eg for >> virtio). But some drivers require to use internal commands prior to any >> device setup, so they have to use a separate reserved command queue just to >> be able to allocate tags. > > Why would virtio-scsi need per-device reserved commands? It currently uses > a global mempool to allocate the reset commands. > Oh, I'm perfectly fine with dropping the per-device reserved commands, and use the host-wide queue in general. It turns out most of the drivers use it that way already. Will be doing so for the next iteration.
Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking h...@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Mary Higgins, Sri Rasiah HRB 21284 (AG Nürnberg)