netdev - Re: r8169 stuck at 100 Mbps

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Message-ID: <f70dd186-e4a4-4650-9648-3a6383a9a5ba@lunn.ch>
Date: Sun, 16 Jul 2023 21:43:51 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Eric Chastan <ericchastan@...e.fr>
Cc: netdev@...r.kernel.org
Subject: Re: r8169 stuck at 100 Mbps

On Sun, Jul 16, 2023 at 09:26:09PM +0200, Eric Chastan wrote:
> Dear developers,
> 
> I am getting in touch because I have trouble getting module r8169 handle gigabit speeds.
> 
> You will find my setup attached.
> 
> Here is the ouptput of ethtool:
> 
> $ sudo ethtool enp2s0
> Settings for enp2s0:
> 	Supported ports: [ TP	 MII ]
> 	Supported link modes:   10baseT/Half 10baseT/Full
> 	                        100baseT/Half 100baseT/Full
> 	                        1000baseT/Full
> 	Supported pause frame use: Symmetric Receive-only
> 	Supports auto-negotiation: Yes
> 	Supported FEC modes: Not reported
> 	Advertised link modes:  1000baseT/Full
> 	Advertised pause frame use: Symmetric Receive-only
> 	Advertised auto-negotiation: No
> 	Advertised FEC modes: Not reported
> 	Speed: 1000Mb/s
> 	Duplex: Full
> 	Auto-negotiation: off

So you have disabled auto-negotiation, and forced 1G. Have you done
the same on link partner? Without auto-neg, the link partners has no
idea what this device is doing, so it is probably doing 10baseT/Half,
unless you have also configured it to force 1G.

But lets take a step back. Put everything back to defaults with
auto-neg and show use the output from ethtool, so hopefully we can see
what the link partner is advertising.

     Andrew