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

Michael Kelley
2019-06-15T18:19:22Z

From: Branden Bonaby <brandonbonaby94@gmail.com> Sent: Friday, June 14, 2019 4:48 PM
>
> 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

Reviewed-by: Michael Kelley <mikelley@microsoft.com>