scsi: always assign block layer tags if enabled
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>
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index e30932f..120a851 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -407,7 +407,6 @@
static int tcm_loop_slave_configure(struct scsi_device *sd)
{
if (sd->tagged_supported) {
- scsi_activate_tcq(sd, sd->queue_depth);
scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG,
sd->host->cmd_per_lun);
} else {
@@ -437,6 +436,7 @@
.slave_alloc = tcm_loop_slave_alloc,
.slave_configure = tcm_loop_slave_configure,
.module = THIS_MODULE,
+ .use_blk_tags = 1,
};
static int tcm_loop_driver_probe(struct device *dev)