scsi: don't set tagging state from scsi_adjust_queue_depth

Remove the tagged argument from scsi_adjust_queue_depth, and just let it
handle the queue depth.  For most drivers those two are fairly separate,
given that most modern drivers don't care about the SCSI "tagged" status
of a command at all, and many old drivers allow queuing of multiple
untagged commands in the driver.

Instead we start out with the ->simple_tags flag set before calling
->slave_configure, which is how all drivers actually looking at
->simple_tags except for one worke anyway.  The one other case looks
broken, but I've kept the behavior as-is for now.

Except for that we only change ->simple_tags from the ->change_queue_type,
and when rejecting a tag message in a single driver, so keeping this
churn out of scsi_adjust_queue_depth is a clear win.

Now that the usage of scsi_adjust_queue_depth is more obvious we can
also remove all the trivial instances in ->slave_alloc or ->slave_configure
that just set it to the cmd_per_lun default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/scsi/scsi_mid_low_api.txt

@@ -271,9 +271,9 @@ init_this_scsi_driver() ----+
                       slave_destroy() ***
 ------------------------------------------------------------
 
-The mid level invokes scsi_adjust_queue_depth() with tagged queuing off and
-"cmd_per_lun" for that host as the queue length. These settings can be
-overridden by a slave_configure() supplied by the LLD.
+The mid level invokes scsi_adjust_queue_depth() with "cmd_per_lun" for that
+host as the queue length. These settings can be overridden by a
+slave_configure() supplied by the LLD.
 
 *** For scsi devices that the mid level tries to scan but do not
     respond, a slave_alloc(), slave_destroy() pair is called.
@@ -438,9 +438,6 @@ int scsi_add_host(struct Scsi_Host *shost, struct device * dev)
 /**
  * scsi_adjust_queue_depth - allow LLD to change queue depth on a SCSI device
  * @sdev:       pointer to SCSI device to change queue depth on
- * @tagged:     0 - no tagged queuing
- *              MSG_SIMPLE_TAG - simple tagged queuing
- *              MSG_ORDERED_TAG - ordered tagged queuing
  * @tags        Number of tags allowed if tagged queuing enabled,
  *              or number of commands the LLD can queue up
  *              in non-tagged mode (as per cmd_per_lun).
@@ -456,8 +453,7 @@ int scsi_add_host(struct Scsi_Host *shost, struct device * dev)
  *      Defined in: drivers/scsi/scsi.c [see source code for more notes]
  *
  **/
-void scsi_adjust_queue_depth(struct scsi_device * sdev, int tagged, 
-                             int tags)
+void scsi_adjust_queue_depth(struct scsi_device *sdev, int tags)
 
 
 /**

drivers/ata/libata-scsi.c

@@ -1164,7 +1164,7 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
 
 		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
 		depth = min(ATA_MAX_QUEUE - 1, depth);
-		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
+		scsi_adjust_queue_depth(sdev, depth);
 	}
 
 	blk_queue_flush_queueable(q, false);
@@ -1282,7 +1282,7 @@ int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
 	if (sdev->queue_depth == queue_depth)
 		return -EINVAL;
 
-	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+	scsi_adjust_queue_depth(sdev, queue_depth);
 	return queue_depth;
 }
 

drivers/infiniband/ulp/srp/ib_srp.c

@@ -2278,7 +2278,7 @@ srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
 			max_depth = 1;
 		if (qdepth > max_depth)
 			qdepth = max_depth;
-		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+		scsi_adjust_queue_depth(sdev, qdepth);
 	} else if (reason == SCSI_QDEPTH_QFULL)
 		scsi_track_queue_full(sdev, qdepth);
 	else

drivers/message/fusion/mptscsih.c

@@ -2347,7 +2347,7 @@ mptscsih_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
 	if (qdepth > max_depth)
 		qdepth = max_depth;
 
-	scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+	scsi_adjust_queue_depth(sdev, qdepth);
 	return sdev->queue_depth;
 }
 

drivers/s390/scsi/zfcp_scsi.c

@@ -37,13 +37,13 @@ static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
 {
 	switch (reason) {
 	case SCSI_QDEPTH_DEFAULT:
-		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+		scsi_adjust_queue_depth(sdev, depth);
 		break;
 	case SCSI_QDEPTH_QFULL:
 		scsi_track_queue_full(sdev, depth);
 		break;
 	case SCSI_QDEPTH_RAMP_UP:
-		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+		scsi_adjust_queue_depth(sdev, depth);
 		break;
 	default:
 		return -EOPNOTSUPP;
@@ -66,9 +66,7 @@ static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
 {
 	if (sdp->tagged_supported)
-		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
-	else
-		scsi_adjust_queue_depth(sdp, 0, 1);
+		scsi_adjust_queue_depth(sdp, default_depth);
 	return 0;
 }
 

drivers/scsi/3w-9xxx.c

@@ -198,7 +198,7 @@ static int twa_change_queue_depth(struct scsi_device *sdev, int queue_depth,
 
 	if (queue_depth > TW_Q_LENGTH-2)
 		queue_depth = TW_Q_LENGTH-2;
-	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	scsi_adjust_queue_depth(sdev, queue_depth);
 	return queue_depth;
 } /* End twa_change_queue_depth() */
 

drivers/scsi/3w-sas.c

@@ -200,7 +200,7 @@ static int twl_change_queue_depth(struct scsi_device *sdev, int queue_depth,
 
 	if (queue_depth > TW_Q_LENGTH-2)
 		queue_depth = TW_Q_LENGTH-2;
-	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	scsi_adjust_queue_depth(sdev, queue_depth);
 	return queue_depth;
 } /* End twl_change_queue_depth() */
 

drivers/scsi/3w-xxxx.c

@@ -532,7 +532,7 @@ static int tw_change_queue_depth(struct scsi_device *sdev, int queue_depth,
 
 	if (queue_depth > TW_Q_LENGTH-2)
 		queue_depth = TW_Q_LENGTH-2;
-	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	scsi_adjust_queue_depth(sdev, queue_depth);
 	return queue_depth;
 } /* End tw_change_queue_depth() */
 

drivers/scsi/53c700.c

@@ -902,8 +902,10 @@ process_message(struct Scsi_Host *host,	struct NCR_700_Host_Parameters *hostdata
 			/* we're done negotiating */
 			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_adjust_queue_depth(SCp->device, 0, host->cmd_per_lun);
+			scsi_adjust_queue_depth(SCp->device, host->cmd_per_lun);
+			scsi_set_tag_type(SCp->device, 0);
 		} else {
 			shost_printk(KERN_WARNING, host,
 				"(%d:%d) Unexpected REJECT Message %s\n",
@@ -2050,12 +2052,10 @@ NCR_700_slave_configure(struct scsi_device *SDp)
 
 	/* to do here: allocate memory; build a queue_full list */
 	if(SDp->tagged_supported) {
-		scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, NCR_700_DEFAULT_TAGS);
+		scsi_adjust_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
 		NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
-	} else {
-		/* initialise to default depth */
-		scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
 	}
+
 	if(hostdata->fast) {
 		/* Find the correct offset and period via domain validation */
 		if (!spi_initial_dv(SDp->sdev_target))
@@ -2083,7 +2083,7 @@ NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
 	if (depth > NCR_700_MAX_TAGS)
 		depth = NCR_700_MAX_TAGS;
 
-	scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
+	scsi_adjust_queue_depth(SDp, depth);
 	return depth;
 }
 
@@ -2101,15 +2101,16 @@ static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
 	if (change_tag)
 		scsi_target_quiesce(SDp->sdev_target);
 
+	scsi_set_tag_type(SDp, tag_type);
 	if (!tag_type) {
 		/* shift back to the default unqueued number of commands
 		 * (the user can still raise this) */
-		scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
+		scsi_adjust_queue_depth(SDp, 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_adjust_queue_depth(SDp, tag_type, SDp->queue_depth);
+		scsi_adjust_queue_depth(SDp, SDp->queue_depth);
 		if (change_tag)
 			NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
 	}

drivers/scsi/BusLogic.c

@@ -2327,12 +2327,12 @@ static int blogic_slaveconfig(struct scsi_device *dev)
 		if (qdepth == 0)
 			qdepth = BLOGIC_MAX_AUTO_TAG_DEPTH;
 		adapter->qdepth[tgt_id] = qdepth;
-		scsi_adjust_queue_depth(dev, MSG_SIMPLE_TAG, qdepth);
+		scsi_adjust_queue_depth(dev, qdepth);
 	} else {
 		adapter->tagq_ok &= ~(1 << tgt_id);
 		qdepth = adapter->untag_qdepth;
 		adapter->qdepth[tgt_id] = qdepth;
-		scsi_adjust_queue_depth(dev, 0, qdepth);
+		scsi_adjust_queue_depth(dev, qdepth);
 	}
 	qdepth = 0;
 	for (tgt_id = 0; tgt_id < adapter->maxdev; tgt_id++)

drivers/scsi/aacraid/linit.c

@@ -462,9 +462,9 @@ static int aac_slave_configure(struct scsi_device *sdev)
 			depth = 256;
 		else if (depth < 2)
 			depth = 2;
-		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
+		scsi_adjust_queue_depth(sdev, depth);
 	} else
-		scsi_adjust_queue_depth(sdev, 0, 1);
+		scsi_adjust_queue_depth(sdev, 1);
 
 	return 0;
 }
@@ -504,9 +504,9 @@ static int aac_change_queue_depth(struct scsi_device *sdev, int depth,
 			depth = 256;
 		else if (depth < 2)
 			depth = 2;
-		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
+		scsi_adjust_queue_depth(sdev, depth);
 	} else
-		scsi_adjust_queue_depth(sdev, 0, 1);
+		scsi_adjust_queue_depth(sdev, 1);
 	return sdev->queue_depth;
 }
 

drivers/scsi/advansys.c

@@ -7706,7 +7706,7 @@ advansys_narrow_slave_configure(struct scsi_device *sdev, ASC_DVC_VAR *asc_dvc)
 				asc_dvc->cfg->can_tagged_qng |= tid_bit;
 				asc_dvc->use_tagged_qng |= tid_bit;
 			}
-			scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG,
+			scsi_adjust_queue_depth(sdev, 
 						asc_dvc->max_dvc_qng[sdev->id]);
 		}
 	} else {
@@ -7714,7 +7714,6 @@ advansys_narrow_slave_configure(struct scsi_device *sdev, ASC_DVC_VAR *asc_dvc)
 			asc_dvc->cfg->can_tagged_qng &= ~tid_bit;
 			asc_dvc->use_tagged_qng &= ~tid_bit;
 		}
-		scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
 	}
 
 	if ((sdev->lun == 0) &&
@@ -7849,10 +7848,8 @@ advansys_wide_slave_configure(struct scsi_device *sdev, ADV_DVC_VAR *adv_dvc)
 	}
 
 	if ((adv_dvc->tagqng_able & tidmask) && sdev->tagged_supported) {
-		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG,
+		scsi_adjust_queue_depth(sdev,
 					adv_dvc->max_dvc_qng);
-	} else {
-		scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
 	}
 }
 

drivers/scsi/aic7xxx/aic79xx_osm.c

@@ -1469,11 +1469,8 @@ ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
 
 	switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
 	case AHD_DEV_Q_BASIC:
-		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TASK,
-				dev->openings + dev->active);
-		break;
 	case AHD_DEV_Q_TAGGED:
-		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TASK,
+		scsi_adjust_queue_depth(sdev,
 				dev->openings + dev->active);
 		break;
 	default:
@@ -1483,7 +1480,7 @@ ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
 		 * serially on the controller/device.  This should
 		 * remove some latency.
 		 */
-		scsi_adjust_queue_depth(sdev, 0, 1);
+		scsi_adjust_queue_depth(sdev, 1);
 		break;
 	}
 }

drivers/scsi/aic7xxx/aic7xxx_osm.c

@@ -1335,13 +1335,9 @@ ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
 	}
 	switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
 	case AHC_DEV_Q_BASIC:
-		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TASK,
-				dev->openings + dev->active);
-		break;
 	case AHC_DEV_Q_TAGGED:
-		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TASK,
+		scsi_adjust_queue_depth(sdev,
 				dev->openings + dev->active);
-		break;
 	default:
 		/*
 		 * We allow the OS to queue 2 untagged transactions to
@@ -1349,7 +1345,7 @@ ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
 		 * serially on the controller/device.  This should
 		 * remove some latency.
 		 */
-		scsi_adjust_queue_depth(sdev, 0, 2);
+		scsi_adjust_queue_depth(sdev, 2);
 		break;
 	}
 }

drivers/scsi/arcmsr/arcmsr_hba.c

@@ -122,7 +122,7 @@ static int arcmsr_adjust_disk_queue_depth(struct scsi_device *sdev,
 
 	if (queue_depth > ARCMSR_MAX_CMD_PERLUN)
 		queue_depth = ARCMSR_MAX_CMD_PERLUN;
-	scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, queue_depth);
+	scsi_adjust_queue_depth(sdev, queue_depth);
 	return queue_depth;
 }
 

drivers/scsi/bfa/bfad_im.c

@@ -776,7 +776,7 @@ bfad_thread_workq(struct bfad_s *bfad)
 static int
 bfad_im_slave_configure(struct scsi_device *sdev)
 {
-	scsi_adjust_queue_depth(sdev, 0, bfa_lun_queue_depth);
+	scsi_adjust_queue_depth(sdev, bfa_lun_queue_depth);
 	return 0;
 }
 
@@ -867,7 +867,6 @@ bfad_ramp_up_qdepth(struct bfad_itnim_s *itnim, struct scsi_device *sdev)
 				if (tmp_sdev->id != sdev->id)
 					continue;
 				scsi_adjust_queue_depth(tmp_sdev,
-					MSG_SIMPLE_TAG,
 					tmp_sdev->queue_depth + 1);
 
 				itnim->last_ramp_up_time = jiffies;

drivers/scsi/csiostor/csio_scsi.c

@@ -2241,7 +2241,7 @@ csio_slave_alloc(struct scsi_device *sdev)
 static int
 csio_slave_configure(struct scsi_device *sdev)
 {
-	scsi_adjust_queue_depth(sdev, 0, csio_lun_qdepth);
+	scsi_adjust_queue_depth(sdev, csio_lun_qdepth);
 	return 0;
 }
 

drivers/scsi/dpt_i2o.c

@@ -415,10 +415,8 @@ static int adpt_slave_configure(struct scsi_device * device)
 	pHba = (adpt_hba *) host->hostdata[0];
 
 	if (host->can_queue && device->tagged_supported) {
-		scsi_adjust_queue_depth(device, MSG_SIMPLE_TAG,
+		scsi_adjust_queue_depth(device,
 				host->can_queue - 1);
-	} else {
-		scsi_adjust_queue_depth(device, 0, 1);
 	}
 	return 0;
 }

drivers/scsi/eata.c

@@ -946,20 +946,18 @@ static int eata2x_slave_configure(struct scsi_device *dev)
 
 	if (TLDEV(dev->type) && dev->tagged_supported) {
 		if (tag_mode == TAG_SIMPLE) {
-			scsi_adjust_queue_depth(dev, MSG_SIMPLE_TAG, tqd);
 			tag_suffix = ", simple tags";
 		} else if (tag_mode == TAG_ORDERED) {
-			scsi_adjust_queue_depth(dev, MSG_ORDERED_TAG, tqd);
 			tag_suffix = ", ordered tags";
 		} else {
-			scsi_adjust_queue_depth(dev, 0, tqd);
 			tag_suffix = ", no tags";
 		}
+		scsi_adjust_queue_depth(dev, tqd);
 	} else if (TLDEV(dev->type) && linked_comm) {
-		scsi_adjust_queue_depth(dev, 0, tqd);
+		scsi_adjust_queue_depth(dev, tqd);
 		tag_suffix = ", untagged";
 	} else {
-		scsi_adjust_queue_depth(dev, 0, utqd);
+		scsi_adjust_queue_depth(dev, utqd);
 		tag_suffix = "";
 	}
 

drivers/scsi/esas2r/esas2r.h

@@ -972,9 +972,6 @@ u8 handle_hba_ioctl(struct esas2r_adapter *a,
 		    struct atto_ioctl *ioctl_hba);
 int esas2r_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd);
 int esas2r_show_info(struct seq_file *m, struct Scsi_Host *sh);
-int esas2r_slave_alloc(struct scsi_device *dev);
-int esas2r_slave_configure(struct scsi_device *dev);
-void esas2r_slave_destroy(struct scsi_device *dev);
 int esas2r_change_queue_depth(struct scsi_device *dev, int depth, int reason);
 long esas2r_proc_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);