Hi, On 10/04/2014 04:46 PM, James Bottomley wrote: > On Sat, 2014-10-04 at 10:53 +0200, Hans de Goede wrote: >> Hi, >> >> On 10/03/2014 11:47 PM, Greg Kroah-Hartman wrote: >>> On Fri, Oct 03, 2014 at 12:08:57PM +0200, Hans de Goede wrote: >>>> With uas over usb-3 the tags inside the uas iu-s must match the usb-3 stream >>>> ids, and those go from 1 - qdepth. >>>> >>>> Before blk-mq calling scsi_activate_tcq(sdev, qdepth) guaranteed that we would >>>> only get cmnd->request->tag from 0 - (qdepth - 1), and we used those as >>>> uas-tags / stream-ids. >>>> >>>> With blk-mq however we are guaranteed to never get more then qdepth commands >>>> queued at the same time, but the cmnd->request->tag values may be much larger, >>>> which breaks uas. >>>> >>>> This commit fixes this by generating uas tags in the 1 - qdepth range ourselves >>>> instead of using cmnd->request->tag. >>>> >>>> While touching all involved code anyways also rename the uas_cmd_info stream >>>> field to uas_tag, because when using uas over usb-2 streams are not used. >>>> >>>> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> >>>> Reported-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> >>>> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> >>>> Reviewed-by: Christoph Hellwig <hch@xxxxxx> >>> >>> This doesn't apply to my usb-next branch of usb.git, care to refresh it >>> and resend? >> >> I did this v2 to resolve a conflict with a last minute fix for 3.17 which >> James Bottomley pushed out yesterday. So if this does not apply that likely >> is because that fix is not (yet) in next. See: >> >> https://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git/log/?h=fixes >> >> And specifically: >> >> https://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git/commit/?h=fixes&id=2c2d831c81ec75a7b0d8e28caa8e3d9c1fe546f9 >> >> I'm not sure how to proceed here, maybe the best thing is to cherry pick >> that fix into usb-next (should disappear on merge), and then apply >> this one on top ? > > Depends: The fixes tree is based on -rc1, so you could just use that as > the base for the topic branch uas goes in. That's the usual way. Or we > could just do it via the SCSI tree, which will have the necessary base. > > Which would you prefer? This patch sits on top of a lot of other uas fixes which are already in usb-next, so this needs to go in through usb-next. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
