scsi: storvsc: Add ability to change scsi queue depth

Adding functionality to allow the SCSI queue depth to be changed by
utilizing the "scsi_change_queue_depth" function.

[mkp: checkpatch]

Signed-off-by: Branden Bonaby <brandonbonaby94@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8472de1..5b6c0f8 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -387,6 +387,7 @@ enum storvsc_request_type {
 
 static int storvsc_ringbuffer_size = (128 * 1024);
 static u32 max_outstanding_req_per_channel;
+static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth);
 
 static int storvsc_vcpus_per_sub_channel = 4;
 
@@ -1711,6 +1712,7 @@ static struct scsi_host_template scsi_driver = {
        .dma_boundary =         PAGE_SIZE-1,
        .no_write_same =        1,
        .track_queue_depth =    1,
+       .change_queue_depth =   storvsc_change_queue_depth,
 };
 
 enum {
@@ -1917,6 +1919,15 @@ err_out0:
        return ret;
 }
 
+/* Change a scsi target's queue depth */
+static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+       if (queue_depth > scsi_driver.can_queue)
+               queue_depth = scsi_driver.can_queue;
+
+       return scsi_change_queue_depth(sdev, queue_depth);
+}
+
 static int storvsc_remove(struct hv_device *dev)
 {
        struct storvsc_device *stor_device = hv_get_drvdata(dev);