[PATCH] scsi: storvsc: Add ability to change scsi queue depth

Branden Bonaby
2019-06-14T23:48:53Z

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

Signed-off-by: Branden Bonaby <brandonbonaby94@gmail.com>
---
drivers/scsi/storvsc_drv.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8472de1007ff..719ca9906fc2 100644
--- 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 @@ static int storvsc_probe(struct hv_device *device,
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);
--
2.17.1