linux-kernel - Re: [PATCH] Add iSCSI IBFT Support (v0.3)

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Date:	Mon, 26 Nov 2007 21:28:47 -0800
From:	Greg KH <greg@...ah.com>
To:	Konrad Rzeszutek <konrad@...nok.org>
Cc:	Doug Maxey <dwm@...yolf.org>, linux-kernel@...r.kernel.org,
	pjones@...hat.com, konradr@...hat.com, konradr@...ux.vnet.ibm.com,
	randy.dunlap@...cle.com, hpa@...or.com, lenb@...nel.org,
	mike.anderson@...ibm.com, dwm@...tin.ibm.com
Subject: Re: [PATCH] Add iSCSI IBFT Support (v0.3)

On Mon, Nov 26, 2007 at 11:50:10PM -0500, Konrad Rzeszutek wrote:
> > >
> > > sysfs files have ONE VALUE PER FILE, not a whole bunch of different
> > > things in a single file.  Please fix this.
> >
> > The subparameters _are_ actually part of a single value, that value being
> > associated with the initiator instance.
> >
> > Konrad is trying to implement a "work-alike" for what open firmware does.
> > open-iscsi already has the ability to extract the same format
> > bits from real OFW.
> >
> > See open-iscsi.git/utils/fwparam_ppc.
> 
> 
> Greg,
> 
> In light of what Doug says (which is all true), should I go ahead with a new 
> version of this module which would export one value per file? The problem 
> that will be encountered is that a ethernetX sysfs directory would have (for 
> example):
> 
> /sys/firmware/ibft/ethernet0/pci-bdf
> 5:1:0
> /sys/firmware/ibft/ethernet0/mac
> 00:11:25:9d:8b:00
> /sys/firmware/ibft/ethernet0/vlan
> 0
> /sys/firmware/ibft/ethernet0/gateway
> 192.168.79.254
> /sys/firmware/ibft/ethernet0/origin
> 0
> /sys/firmware/ibft/ethernet0/subnet-mask
> 22
> /sys/firmware/ibft/ethernet0/ip-addr
> 192.168.77.41
> /sys/firmware/ibft/ethernet0/flags
> 7

Yes, that is the proper way to do this kind of thing in sysfs.

> And the flag would contain the value "7" which would mean the user would have 
> to parse what each bit means? (the v0.3 of the module does not export this 
> flag but uses it to figure out which is the boot iSCSI target).

Sure, as long as it means something to userspace, and is a single value,
and is documented, that's fine.

thanks,

greg k-h
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