netdev - Re: biosdevname v0.3.2

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Message-ID: <1291747282.21627.9.camel@bwh-desktop>
Date:	Tue, 07 Dec 2010 18:41:22 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Matt Domsch <Matt_Domsch@...l.com>
Cc:	linux-hotplug@...r.kernel.org, netdev@...r.kernel.org,
	"K, Narendra" <Narendra_K@...l.com>,
	"Hargrave, Jordan" <Jordan_Hargrave@...l.com>,
	"Rose, Charles" <Charles_Rose@...l.com>,
	Colin Watson <cjwatson@...ntu.com>
Subject: Re: biosdevname v0.3.2

On Tue, 2010-12-07 at 12:19 -0600, Matt Domsch wrote:
> On Tue, Dec 07, 2010 at 06:16:22PM +0000, Ben Hutchings wrote:
> > It appears that 'unknown slot' is treated as a specific slot and all
> > devices with an unknown slot are given unique indices.  Perhaps this
> > doesn't matter in the end, since no name is generated when the slot is
> > unknown.
> 
> Yes on all counts.
>  
> > However, the 2 NIC ports do have their own indices (specified with the
> > dev_id attribute) and it should be possible to distinguish slots by
> > PCI/PCIe topology even though the name given won't correspond to any
> > markings on the motherboard.
> 
> Tell me more about the dev_id attribute.  I'm happy to use it, but I
> don't understand the rules around populating it.

As I understand it, dev_id is supposed to distinguish net devices
corresponding to multiple ports on a single network controller.
However, a value of 0 could mean either 'unspecified' or 'first port' so
you would have to verify that multiple net devices for the same slot
have unique dev_id values before taking them into account.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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