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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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11
drivers/scsi/libsas/sas_scsi_host.c
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@@ -940,15 +940,13 @@ int sas_slave_configure(struct scsi_device *scsi_dev)
sas_read_port_mode_page(scsi_dev);
if (scsi_dev->tagged_supported) {
scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG, SAS_DEF_QD);
} else {
SAS_DPRINTK("device %llx, LUN %llx doesn't support "
"TCQ\n", SAS_ADDR(dev->sas_addr),
scsi_dev->lun);
scsi_dev->tagged_supported = 0;
scsi_set_tag_type(scsi_dev, 0);
scsi_deactivate_tcq(scsi_dev, 1);
scsi_adjust_queue_depth(scsi_dev, 0, 1);
}
scsi_dev->allow_restart = 1;
@@ -991,10 +989,7 @@ int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
if (!scsi_dev->tagged_supported)
return 0;
scsi_deactivate_tcq(scsi_dev, 1);
scsi_set_tag_type(scsi_dev, qt);
scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
scsi_adjust_queue_depth(scsi_dev, qt, scsi_dev->queue_depth);
return qt;
}