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

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Date:	Tue, 09 Oct 2007 11:29:20 -0400
From:	James Smart <James.Smart@...lex.Com>
To:	Andrew Vasquez <andrew.vasquez@...gic.com>
CC:	"Darrick J. Wong" <djwong@...ibm.com>,
	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

Why do you prefer request_firmware() vs something over sysfs ?

Does environments like the kdump kernel also have access to data needed
by request_firmware() ?

-- james s


Andrew Vasquez wrote:
> 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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