linux-kernel - RE: [PATCH V2 2/8] Drivers: scsi: storvsc: Set cmd_per_lun to reflect value supported by the Host

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Message-ID: <29c69dee7c6e4462a7d2913ae2b0b522@BY2PR03MB299.namprd03.prod.outlook.com>
Date:	Thu, 10 Jul 2014 22:08:23 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"apw@...onical.com" <apw@...onical.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH V2 2/8] Drivers: scsi: storvsc: Set cmd_per_lun to reflect
 value supported by the Host



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Thursday, July 10, 2014 3:25 AM
> To: KY Srinivasan
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> ohering@...e.com; jbottomley@...allels.com; hch@...radead.org;
> jasowang@...hat.com; apw@...onical.com; linux-scsi@...r.kernel.org;
> stable@...r.kernel.org
> Subject: Re: [PATCH V2 2/8] Drivers: scsi: storvsc: Set cmd_per_lun to reflect
> value supported by the Host
> 
> > -	.cmd_per_lun =		1,
> > +	.cmd_per_lun =		255,
> >  	.can_queue =
> 	STORVSC_MAX_IO_REQUESTS*STORVSC_MAX_TARGETS,
> 
> slave_configure immediately adjusts this down to
> STORVSC_MAX_IO_REQUESTS (250), any reson to start out with the magic
> 255 here?

The number 255 (set for cmd_per_lun) is what the host can support (I recently discovered this in an MSDN document). STORVSC_MAX_IO_REQUESTS is an implementation limitation in this driver.

Regards,

K. Y
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