linux-kernel - Re: cdc_ncm doesn't detect link unless ethtool is run (ASIX AX88179B)

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Message-ID: <45655b89-14db-4cae-b92f-118b7cbd8586@ya.ru>
Date: Mon, 17 Nov 2025 15:44:52 +0300
From: WGH <da-wgh@...ru>
To: Oliver Neukum <oneukum@...e.com>, andrew+netdev@...n.ch,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, linux-usb@...r.kernel.org, netdev@...r.kernel.org,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: cdc_ncm doesn't detect link unless ethtool is run (ASIX AX88179B)

On 11/15/25 15:33, Oliver Neukum wrote:
> On 15.11.25 09:58, WGH wrote:
>> Hello.
>>
>> I'm running Linux 6.17.7, and recently obtained a UGREEN 6 in 1 hub containing an AX88179B chip.
>>
>> By default, it uses the generic cdc_ncm driver, and it works mostly okay.
>>
>> The annoying problem I have is that most of the time the kernel doesn't notice that the link is up. ip link reports NO-CARRIER, network management daemon doesn't configure the interface, and so on.
>
> Hi,
>
> that strongly points to a race condition.
> Could you try the attached diagnostic patch?
>
>     Regards
>         Oliver

Nope, this patch doesn't help.