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[79.185.228.195]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-30f464cbbb0sm9044391fa.30.2025.04.11.15.42.07 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Fri, 11 Apr 2025 15:42:07 -0700 (PDT) Date: Sat, 12 Apr 2025 00:42:03 +0200 From: =?UTF-8?B?TWljaGHFgg==?= Pecio To: Lubomir Rintel Cc: linux-usb@vger.kernel.org, Paolo Abeni , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Jakub Kicinski , Eric Dumazet , "David S. Miller" , Andrew Lunn Subject: Re: [PATCH v3 net-next] rndis_host: Flag RNDIS modems as WWAN devices Message-ID: <20250412004203.099e482a@foxbook> In-Reply-To: <20250325095842.1567999-1-lkundrak@v3.sk> References: <20250325095842.1567999-1-lkundrak@v3.sk> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 25 Mar 2025 10:58:41 +0100, 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 > Fixes: 63ba395cd7a5 ("rndis_host: support Novatel Verizon USB730L") Hi, This patch appears to have caused a regression for some users, who opened a bug against the USB subsystem here: https://bugzilla.kernel.org/show_bug.cgi?id=220002 Regards, Michal