linux-kernel - Re: [PATCH] r8169: add support for RTL8127ATF

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Message-ID: <ff55848b-5543-4a8d-b8c2-88837db16c29@gmail.com>
Date: Tue, 18 Nov 2025 21:02:22 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Andrew Lunn <andrew@...n.ch>, Fabio Baltieri <fabio.baltieri@...il.com>
Cc: nic_swsd@...ltek.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>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] r8169: add support for RTL8127ATF

On 11/18/2025 8:31 PM, Andrew Lunn wrote:
>> I see, unfortunately all I have for this NIC is the out of tree Realtek
>> driver and it does not seem to implement the API for reading the module
>> EEPROM data, and there's no datasheet available, so I'm afraid that
>> either the Realtek folks pick this up or it's not going to happen.
> 
> Heiner is of the opinion it is not going to happen.
> 
Realtek seems to do all SFP handling in firmware, w/o providing info about
to which extent this firmware can be controlled via chip registers.

A contact in Realtek confirmed that only 1G and 10G speeds are supported.
He wasn't sure whether copper SFP modules are supported, and will check
internally.

I'll try to strip down the patch as far as possible, likely supporting 10G
only in the beginning (as 1G requires some more vendor magic to configure).
I assume the typical user won't spend money on a 10G card to use it with a
1G fiber module.
Reducing complexity of the patch should make the decision easier to accept it.

I don't have hw with RTL8127ATF, so I would give the patch to Fabio for testing.

> 	Andrew

Heiner