[PATCH v4 01/21] ibmvfc: add vhost fields and defaults for MQ enablement

[Tyrel Datwyler]

Introduce several new vhost fields for managing MQ state of the adapter
as well as initial defaults for MQ enablement.

Signed-off-by: Tyrel Datwyler <tyreld@xxxxxxxxxxxxx>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 8 ++++++++
 drivers/scsi/ibmvscsi/ibmvfc.h | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index ba95438a8912..9200fe49c57e 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3302,6 +3302,7 @@ static struct scsi_host_template driver_template = {
 	.max_sectors = IBMVFC_MAX_SECTORS,
 	.shost_attrs = ibmvfc_attrs,
 	.track_queue_depth = 1,
+	.host_tagset = 1,
 };
 
 /**
@@ -5290,6 +5291,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	shost->max_sectors = IBMVFC_MAX_SECTORS;
 	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
 	shost->unique_id = shost->host_no;
+	shost->nr_hw_queues = IBMVFC_MQ ? IBMVFC_SCSI_HW_QUEUES : 1;
 
 	vhost = shost_priv(shost);
 	INIT_LIST_HEAD(&vhost->targets);
@@ -5300,6 +5302,12 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	vhost->partition_number = -1;
 	vhost->log_level = log_level;
 	vhost->task_set = 1;
+
+	vhost->mq_enabled = IBMVFC_MQ;
+	vhost->client_scsi_channels = IBMVFC_SCSI_CHANNELS;
+	vhost->using_channels = 0;
+	vhost->do_enquiry = 1;
+
 	strcpy(vhost->partition_name, "UNKNOWN");
 	init_waitqueue_head(&vhost->work_wait_q);
 	init_waitqueue_head(&vhost->init_wait_q);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 632e977449c5..dd6d89292867 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -41,6 +41,11 @@
 #define IBMVFC_DEFAULT_LOG_LEVEL	2
 #define IBMVFC_MAX_CDB_LEN		16
 #define IBMVFC_CLS3_ERROR		0
+#define IBMVFC_MQ			0
+#define IBMVFC_SCSI_CHANNELS		0
+#define IBMVFC_SCSI_HW_QUEUES		1
+#define IBMVFC_MIG_NO_SUB_TO_CRQ	0
+#define IBMVFC_MIG_NO_N_TO_M		0
 
 /*
  * Ensure we have resources for ERP and initialization:
@@ -840,6 +845,10 @@ struct ibmvfc_host {
 	int delay_init;
 	int scan_complete;
 	int logged_in;
+	int mq_enabled;
+	int using_channels;
+	int do_enquiry;
+	int client_scsi_channels;
 	int aborting_passthru;
 	int events_to_log;
 #define IBMVFC_AE_LINKUP	0x0001
-- 
2.27.0