linux-kernel - RE: [PATCH 1/1] scsi: storvsc: Support manual scan of FC hosts on Hyper-V

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Message-ID: <SN2PR03MB21423A42522A21C145896431A0890@SN2PR03MB2142.namprd03.prod.outlook.com>
Date:	Tue, 15 Mar 2016 14:27:53 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"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>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"hare@...e.de" <hare@...e.de>
Subject: RE: [PATCH 1/1] scsi: storvsc: Support manual scan of FC hosts on
 Hyper-V



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Tuesday, March 15, 2016 6:40 AM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com; hch@...radead.org; linux-scsi@...r.kernel.org;
> apw@...onical.com; vkuznets@...hat.com; jasowang@...hat.com;
> martin.petersen@...cle.com; hare@...e.de
> Subject: Re: [PATCH 1/1] scsi: storvsc: Support manual scan of FC hosts on
> Hyper-V
> 
> On Sat, Mar 12, 2016 at 01:52:48PM -0800, K. Y. Srinivasan wrote:
> > The default user scan function associated with FC (fc_user_scan)
> > is not suitable for FC hosts on Hyper-V since we don't have
> > an rport associated with FC host on Hyper-V . Set it to NULL so we can
> > support manual scan of FC targets on Hyper-V.
> 
> This isn't really how the FC transport class in intended to work, but
> neither is the eh_timed_out (which I haven't seen in my tree yet).
> 
> It sounds like storvsc simply shouldn't attach to the FC transport
> if it doesn't actually look like a FC HBA.

Till recently I had not. However, we do support publishing wwn in the guest and
some customers wanted this. That is the reason I am attaching FC transport and working
through the issues. With this change, I now have wwn names published in the guest and I can
also issue manual scan.


Regards,

K. Y