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

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Message-ID: <701e5678-a992-45be-9be3-df68dfe14705@suse.com>
Date: Sat, 15 Nov 2025 13:33:48 +0100
From: Oliver Neukum <oneukum@...e.com>
To: WGH <da-wgh@...ru>, 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 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

View attachment "ncm_bind_uncond.patch" of type "text/x-patch" (442 bytes)