linux-kernel - Re: [PATCH] aic94xx: Use request_firmware() to provide SAS address if the adapter lacks one

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Message-ID: <20071009001240.GA13922@plap3.qlogic.org>
Date:	Mon, 8 Oct 2007 17:12:40 -0700
From:	Andrew Vasquez <andrew.vasquez@...gic.com>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alexis Bruemmer <alexisb@...ibm.com>,
	James Bottomley <james.bottomley@...eleye.com>
Subject: Re: [PATCH] aic94xx: Use request_firmware() to provide SAS address
	if the adapter lacks one

On Mon, 08 Oct 2007, Darrick J. Wong wrote:

> On Mon, Oct 08, 2007 at 03:48:32PM -0700, Andrew Vasquez wrote:
> 
> > So how about factoring that out to a transport-level interface.  How
> > about something along the lines of the following patch, whereby the
> > software driver upon detecting no valid WWPN, makes an upcall to each
> > interface's 'request_wwn()'.  The data passed in from shost_gendev
> > should be enough for some helper script to cull relevent device bits
> > and perhaps offer some level of persistence...  Off base?
> 
> Hrm... jejb made a remark that it might be better to pass the
> scsi_host's device into request_firmware() as your example does, so I'll
> pitch in a patch to do likewise with libsas--the scsi_host knows the
> actual device it's coming from, and userland can sort that all out later
> anyway via DEVPATH.
> 
> I suppose one could also have multiple scsi_hosts per PCI device, which
> means that my first patch would stumble horribly in more than a few
> cases.

This is done already in the FC case -- NPIV.  Though with that
interface, the administrator is already responsible for assigning
proper WWNN/WWPN during creation.

> > Darrick, forgive the FC example, I don't do SAS...
> 
> That's ok, I don't do FC. :)  Looks mostly good to me...

--
av
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