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

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Message-ID: <be9b5704-ac9c-4cd5-aead-37433c4305a8@tuxedocomputers.com>
Date: Mon, 19 Jan 2026 18:45:20 +0100
From: Georg Gottleuber <ggo@...edocomputers.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>,
 Georg Gottleuber <ggo@...edocomputers.com>
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

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.

Regards,
Georg

View attachment "ethtool_stats_after.txt" of type "text/plain" (6557 bytes)

View attachment "ethtool_stats_before.txt" of type "text/plain" (6464 bytes)