[PATCH v4 14/24] mpi3mr: add change queue depth support

[Kashyap Desai <kashyap.desai@broadcom.com>]

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Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>

Cc: sathya.prakash@broadcom.com
---
 drivers/scsi/mpi3mr/mpi3mr.h    |  3 +++
 drivers/scsi/mpi3mr/mpi3mr_os.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index d6aab3b04eff..960943452a7a 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -141,6 +141,9 @@ extern struct list_head mrioc_list;
 /* Command retry count definitions */
 #define MPI3MR_DEV_RMHS_RETRY_COUNT 3
 
+/* Default target device queue depth */
+#define MPI3MR_DEFAULT_SDEV_QD	32
+
 /* SGE Flag definition */
 #define MPI3MR_SGEFLAGS_SYSTEM_SIMPLE_END_OF_LIST \
 	(MPI3_SGE_FLAGS_ELEMENT_TYPE_SIMPLE | MPI3_SGE_FLAGS_DLAS_SYSTEM | \
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index d3eedc2ac410..786128da1b54 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -643,6 +643,33 @@ static int mpi3mr_report_tgtdev_to_host(struct mpi3mr_ioc *mrioc,
 	return retval;
 }
 
+/**
+ * mpi3mr_change_queue_depth- Change QD callback handler
+ * @sdev: SCSI device reference
+ * @q_depth: Queue depth
+ *
+ * Validate and limit QD and call scsi_change_queue_depth.
+ *
+ * Return: return value of scsi_change_queue_depth
+ */
+static int mpi3mr_change_queue_depth(struct scsi_device *sdev,
+	int q_depth)
+{
+	struct scsi_target *starget = scsi_target(sdev);
+	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+	int retval = 0;
+
+	if (!sdev->tagged_supported)
+		q_depth = 1;
+	if (q_depth > shost->can_queue)
+		q_depth = shost->can_queue;
+	else if (!q_depth)
+		q_depth = MPI3MR_DEFAULT_SDEV_QD;
+	retval = scsi_change_queue_depth(sdev, q_depth);
+
+	return retval;
+}
+
 /**
  * mpi3mr_update_sdev - Update SCSI device information
  * @sdev: SCSI device reference
@@ -663,6 +690,7 @@ mpi3mr_update_sdev(struct scsi_device *sdev, void *data)
 	if (!tgtdev)
 		return;
 
+	mpi3mr_change_queue_depth(sdev, tgtdev->q_depth);
 	switch (tgtdev->dev_type) {
 	case MPI3_DEVICE_DEVFORM_PCIE:
 		/*The block layer hw sector size = 512*/
@@ -2632,6 +2660,7 @@ static int mpi3mr_slave_configure(struct scsi_device *sdev)
 	if (!tgt_dev)
 		return -ENXIO;
 
+	mpi3mr_change_queue_depth(sdev, tgt_dev->q_depth);
 	switch (tgt_dev->dev_type) {
 	case MPI3_DEVICE_DEVFORM_PCIE:
 		/*The block layer hw sector size = 512*/
@@ -2885,6 +2914,7 @@ static struct scsi_host_template mpi3mr_driver_template = {
 	.slave_destroy			= mpi3mr_slave_destroy,
 	.scan_finished			= mpi3mr_scan_finished,
 	.scan_start			= mpi3mr_scan_start,
+	.change_queue_depth		= mpi3mr_change_queue_depth,
 	.eh_device_reset_handler	= mpi3mr_eh_dev_reset,
 	.eh_target_reset_handler	= mpi3mr_eh_target_reset,
 	.eh_host_reset_handler		= mpi3mr_eh_host_reset,
-- 
2.18.1


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