linux-kernel - Re: [PATCH] rndis_host: Flag RNDIS modems as WWAN devices

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Message-ID: <932f543d-8fa4-4891-a804-f58a55356ab9@redhat.com>
Date: Thu, 13 Mar 2025 13:24:49 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Lubomir Rintel <lkundrak@...sk>, linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew+netdev@...n.ch>
Subject: Re: [PATCH] rndis_host: Flag RNDIS modems as WWAN devices

On 3/11/25 10:10 AM, Lubomir Rintel wrote:
> Set FLAG_WWAN instead of FLAG_ETHERNET for RNDIS interfaces on Mobile
> Broadband Modems, as opposed to regular Ethernet adapters.
> 
> Otherwise NetworkManager gets confused, misjudges the device type,
> and wouldn't know it should connect a modem to get the device to work.
> What would be the result depends on ModemManager version -- older
> ModemManager would end up disconnecting a device after an unsuccessful
> probe attempt (if it connected without needing to unlock a SIM), while
> a newer one might spawn a separate PPP connection over a tty interface
> instead, resulting in a general confusion and no end of chaos.
> 
> The only way to get this work reliably is to fix the device type
> and have good enough version ModemManager (or equivalent).
> 
> Signed-off-by: Lubomir Rintel <lkundrak@...sk>

This looks like a fix for the net tree, could you please provide a
suitable 'Fixes' tag? Also next time please additionally specify the
target tree in the subj prefix,

Thanks!

Paolo