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

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Message-ID: <BL0PR2101MB13482F73342F77866D6A6AABD7E90@BL0PR2101MB1348.namprd21.prod.outlook.com>
Date:   Sat, 15 Jun 2019 18:19:00 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     brandonbonaby94 <brandonbonaby94@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     brandonbonaby94 <brandonbonaby94@...il.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi: storvsc: Add ability to change scsi queue depth

From: Branden Bonaby <brandonbonaby94@...il.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@...il.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@...rosoft.com>