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/scsi/53c700.c b/drivers/scsi/53c700.c
index 1b36fd3..497cbb1 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -327,6 +327,7 @@
tpnt->slave_alloc = NCR_700_slave_alloc;
tpnt->change_queue_depth = NCR_700_change_queue_depth;
tpnt->change_queue_type = NCR_700_change_queue_type;
+ tpnt->use_blk_tags = 1;
if(tpnt->name == NULL)
tpnt->name = "53c700";
@@ -902,7 +903,7 @@
NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
SCp->device->tagged_supported = 0;
- scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
+ scsi_adjust_queue_depth(SCp->device, 0, host->cmd_per_lun);
} else {
shost_printk(KERN_WARNING, host,
"(%d:%d) Unexpected REJECT Message %s\n",
@@ -2049,8 +2050,7 @@
/* to do here: allocate memory; build a queue_full list */
if(SDp->tagged_supported) {
- scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
- scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
+ scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, NCR_700_DEFAULT_TAGS);
NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
} else {
/* initialise to default depth */
@@ -2094,8 +2094,6 @@
struct NCR_700_Host_Parameters *hostdata =
(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
- scsi_set_tag_type(SDp, tag_type);
-
/* We have a global (per target) flag to track whether TCQ is
* enabled, so we'll be turning it off for the entire target here.
* our tag algorithm will fail if we mix tagged and untagged commands,
@@ -2106,12 +2104,12 @@
if (!tag_type) {
/* shift back to the default unqueued number of commands
* (the user can still raise this) */
- scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
+ scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
} else {
/* Here, we cleared the negotiation flag above, so this
* will force the driver to renegotiate */
- scsi_activate_tcq(SDp, SDp->queue_depth);
+ scsi_adjust_queue_depth(SDp, tag_type, SDp->queue_depth);
if (change_tag)
NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
}