On Tue, Nov 25, 2014 at 08:33:28PM +0530, Kashyap Desai wrote: > Just trying to understand your above comment. I see host template has new > field called > "reserved_tags" which is normally used by mid layer to reserved block tag > pool for driver's internal use. > What if driver is OK to manage internal pool without any blk tag > dependency and do not expose actual max can queue of what FW can support. > For example, in megaraid_sas driver FW expose max_fw_cmd = 1024 and driver > keep some reserve (let's say 24 commands for internal use) and it just > expose 1000 command for blk tags. This will work for blk-mq and legacy > blk driver. Let driver to manage whatever internal reserved it kept for > and do not add any dependency with blk tag from above layer for those > reserved pool.
The driver can of coure always just manage its internal tags, but that means we need to duplicate a tag allocator in every driver. In short it works ok for now, but I'd rather solve the problem in a single place. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
