linux-kernel - Re: [PATCH RESEND net-next v6 0/3] Add DWMAC glue driver for Motorcomm YT6801

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Message-ID: <24cfefff-1233-4745-8c47-812b502d5d19@tuxedocomputers.com>
Date: Mon, 19 Jan 2026 18:57:48 +0100
From: Georg Gottleuber <ggo@...edocomputers.com>
To: Georg Gottleuber <ggo@...edocomputers.com>,
 "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Yao Zi <me@...ao.cc>, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 Frank.Sae@...or-comm.com, hkallweit1@...il.com, vladimir.oltean@....com,
 wens@...e.org, jszhang@...nel.org, 0x1207@...il.com,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, jeffbai@...c.io,
 kexybiscuit@...c.io, Christoffer Sandberg <cs@...edocomputers.com>
Subject: Re: [PATCH RESEND net-next v6 0/3] Add DWMAC glue driver for
 Motorcomm YT6801

Am 19.01.26 um 18:45 schrieb Georg Gottleuber:
> Hi,
> 
> thanks for the quick reply.
> 
> Am 19.01.26 um 16:43 schrieb Russell King (Oracle):
>> On Mon, Jan 19, 2026 at 04:33:17PM +0100, Georg Gottleuber wrote:
>>> Hi,
>>>
>>> I tested this driver with our TUXEDO InfinityBook Pro AMD Gen9. Iperf
>>> revealed that tx is only 100Mbit/s:
>>>
> ...
>>>
>>> With our normally used DKMS module, Ethernet works with full-duplex and
>>> gigabit. Attached are some logs from lspci and dmesg. Do you have any
>>> idea how I can debug this further?
>>
>> My suggestion would be:
>>
>> - Look at the statistics, e.g.
>>
>>    ip -s li sh dev enp2s0
> 
> That looks good (after iperf):
> 
> 2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
> mode DEFAULT group default qlen 1000
>     link/ether ba:90:88:24:49:4f brd ff:ff:ff:ff:ff:ff
>     RX:  bytes packets errors dropped  missed   mcast
>        2091654   31556      0       0       0       0
>     TX:  bytes packets errors dropped carrier collsns
>       88532451    1518      0       0       0       0
> 
> 
>> - apply
>>   https://lore.kernel.org/r/E1vgtBc-00000005D6v-040n@rmk-PC.armlinux.org.uk
>>   to enable more statistics to work, and check the network driver
>>   statistics:
>>
>>    ethtool --statistics enp2s0
>>
>> to see if there's any clues for what is going on.
> 
> That looks also good, I think. I saved it before and after the test with
> iperf. See attachments.

Oh, there was something else interesting in dmesg. See attachment.

> Regards,
> Georg

View attachment "dmesg_motorcomm.txt" of type "text/plain" (1822 bytes)