netdev - Re: Fwd: Problem with r8169 module

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Date:   Mon, 2 Nov 2020 09:14:06 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Gilberto Nunes <gilberto.nunes32@...il.com>, netdev@...r.kernel.org
Subject: Re: Fwd: Problem with r8169 module

On 02.11.2020 04:36, Gilberto Nunes wrote:
> Hi there
> 
> I am in trouble when using newer kernels than 5.4.x regarding Realtek NIC r8169
> 
> Kernel 5.9.2-050902-lowlatency (from
> https://kernel.ubuntu.com/~kernel-ppa/mainline/ and also compiled from
> kernel.org)
> 
> Generic FE-GE Realtek PHY r8169-101:00: Downshift occurred from
> negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
> r8169 0000:01:00.1 enp1s0f1: Link is Up - 100Mbps/Full (downshifted) -
> flow control rx/tx
> 
> Kernel 5.4.73-050473-lowlatency (from
> https://kernel.ubuntu.com/~kernel-ppa/mainline/)
> 
> IPv6: ADDRCONF(NETDEV_CHANGE): enp1s0f1: link becomes ready
> r8169 0000:01:00.1 enp1s0f1: Link is Up - 1Gbps/Full - flow control rx/tx
> 
> Cable is ok! I double check it....
> 
The downshift hint didn't exist yet in 5.4. Can you check what the actual
link speed is under 5.4 (e.g. using iperf3).

Under 5.9:
Does the downshift happen directly when the link is initially established,
or after some time?

If link speed actually differs, then please:
- provide full dmesg log
- ideally do a git bisect to find the offending commit
  (as issue most likely is chip version / system dependent)

> 
> 
> 
> 
> ---
> Gilberto Nunes Ferreira
>