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scsi: always assign block layer tags if enabled

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Allow a driver to ask for block layer tags by setting .use_blk_tags in the
host template, in which case it will always see a valid value in
request->tag, similar to the behavior when using blk-mq.  This means even
SCSI "untagged" commands will now have a tag, which is especially useful
when using a host-wide tag map.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig
2014-11-03 14:09:02 +01:00
parent e2eddf4d53
commit 2ecb204d07
33 changed files with 86 additions and 168 deletions
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3
drivers/scsi/tmscsim.c
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@@ -2187,7 +2187,7 @@ static int dc390_slave_configure(struct scsi_device *sdev)
acb->scan_devices = 0;
if (sdev->tagged_supported && (dcb->DevMode & TAG_QUEUEING_)) {
dcb->SyncMode |= EN_TAG_QUEUEING;
scsi_activate_tcq(sdev, acb->TagMaxNum);
scsi_adjust_queue_depth(sdev, 0, acb->TagMaxNum);
}
return 0;
@@ -2209,6 +2209,7 @@ static struct scsi_host_template driver_template = {
.cmd_per_lun = 1,
.use_clustering = ENABLE_CLUSTERING,
.max_sectors = 0x4000, /* 8MiB = 16 * 1024 * 512 */
.use_blk_tags = 1,
};
/***********************************************************************