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

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Date:   Mon, 17 Jun 2019 17:08:21 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        brandonbonaby94 <brandonbonaby94@...il.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



> -----Original Message-----
> From: Michael Kelley <mikelley@...rosoft.com>
> Sent: Saturday, June 15, 2019 11:19 AM
> To: brandonbonaby94 <brandonbonaby94@...il.com>; KY Srinivasan
> <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>; Stephen
> Hemminger <sthemmin@...rosoft.com>; sashal@...nel.org;
> jejb@...ux.ibm.com; martin.petersen@...cle.com
> Cc: brandonbonaby94 <brandonbonaby94@...il.com>; linux-
> hyperv@...r.kernel.org; linux-scsi@...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>
Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>