netdev - Re: [PATCH] net: usb: usbnet: restore usb%d name exception for local mac addresses

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Message-ID: <5b93b521-4cc8-47d3-844a-33cf6477a016@lunn.ch>
Date: Tue, 3 Dec 2024 21:47:57 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Dominique Martinet <asmadeus@...ewreck.org>
Cc: Oliver Neukum <oneukum@...e.com>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Dominique Martinet <dominique.martinet@...ark-techno.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: usb: usbnet: restore usb%d name exception for local
 mac addresses

On Tue, Dec 03, 2024 at 10:04:55PM +0900, Dominique Martinet wrote:
> From: Dominique Martinet <dominique.martinet@...ark-techno.com>
> 
> The previous commit assumed that local addresses always came from the
> kernel, but some devices hand out local mac addresses so we ended up
> with point-to-point devices with a mac set by the driver, renaming to
> eth%d when they used to be named usb%d.
> 
> Userspace should not rely on device name, but for the sake of stability
> restore the local mac address check portion of the naming exception:
> point to point devices which either have no mac set by the driver or
> have a local mac handed out by the driver will keep the usb%d name.

Are you saying the OTP or NVMEM has a locally administered MAC address
stored in it? Is there a mechanism to change it? The point about
locally administered MAC addresses is that they are locally
administered.

	Andrew