netdev - Re: PATCH: Network Device Naming mechanism and policy

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Message-ID: <20091011230402.GA18776@mock.linuxdev.us.dell.com>
Date:	Sun, 11 Oct 2009 18:04:02 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Rob Townley <rob.townley@...il.com>
Cc:	Greg KH <greg@...ah.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, linux-hotplug@...r.kernel.org,
	Narendra_K@...l.com, jordan_hargrave@...l.com
Subject: Re: PATCH: Network Device Naming mechanism and policy

On Sun, Oct 11, 2009 at 04:10:03PM -0500, Rob Townley wrote:
> So when an add-in PCI NIC has a lower MAC than the motherboard NICs,
> the add-in cards will come before the motherboard NICs.   i don't like it.

Actually, MAC address has nothing to do with device naming/ordering at
all.  Often systems will have onboard NICs in ascending MAC address
order, but that's not a requirement, and I've seen systems not do
that.  And once you get to add-in vs onboard, BIOS wouldn't be able to
enforce such an ordering anyhow (in general).

But yes, you raise the point that, without using MAC-assigned names or
another naming mechanism designed to cope with this, adding or
removing a card can cause a difference in device enumeration, and thus
name.

-- 
Matt Domsch
Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
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