linux-kernel - Re: [PATCH 1/3 v3] net: usb: r8152: Check used MAC passthrough address

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Message-ID: <bb6d8bc4-abee-8536-ca5b-bac11d1ecd53@suse.com>
Date:   Wed, 5 Jan 2022 22:49:56 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Andrew Lunn <andrew@...n.ch>, Aaron Ma <aaron.ma@...onical.com>
CC:     kuba@...nel.org, henning.schild@...mens.com,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        hayeswang@...ltek.com, tiwai@...e.de
Subject: Re: [PATCH 1/3 v3] net: usb: r8152: Check used MAC passthrough
 address


On 05.01.22 18:30, Andrew Lunn wrote:
> On Wed, Jan 05, 2022 at 11:14:25PM +0800, Aaron Ma wrote:
>> When plugin multiple r8152 ethernet dongles to Lenovo Docks
>> or USB hub, MAC passthrough address from BIOS should be
>> checked if it had been used to avoid using on other dongles.
>>
>> Currently builtin r8152 on Dock still can't be identified.
>> First detected r8152 will use the MAC passthrough address.
> I do have to wonder why you are doing this in the kernel, and not
> using a udev rule? This seems to be policy, and policy does not belong
> in the kernel.
Debatable. An ethernet NIC has to have a MAC. The kernel must
provide one. That we should always take the one found in the
device's ROM rather than the host's ROM is already a policy decision.

In fact we make up a MAC for devices that do not have one.

    Regards
        Oliver