New: rndis_host: Zyxel 5G portable router seen as a WWAN device and not an Ethernet one in 6.13

https://bugzilla.kernel.org/show_bug.cgi?id=220044

Bug ID: 220044
Summary: rndis_host: Zyxel 5G portable router seen as a WWAN
device and not an Ethernet one in 6.13
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: USB
Assignee: [email protected]
Reporter: [email protected]
Regression: No

Hello,

I've a Zyxel 5G portable router (NR2301).

Bus 003 Device 002: ID 05c6:9057 Qualcomm, Inc. SDXLEMUR-LITE-MTP _SN:XXXX

With kernel 6.12.22 from debian unstable, when the device is connected to the computer by USB, it is seen as a network card and NetworkManager (1.52.0) runs DHCP to get a connection.

With 6.13, this is not the case anymore.

dmesg output with 6.12.22:
rndis_host 3-2:1.0 eth0: register 'rndis_host' at usb-0000:00:14.0-2, RNDIS device, fc:dd:55:ff:ff:ff
usbcore: registered new interface driver rndis_host
rndis_host 3-2:1.0 enxfcdd55ffffff: renamed from eth0

dmesg output with 6.13:
rndis_host 3-2:1.0 wwan0: register 'rndis_host' at usb-0000:00:14.0-2, Mobile Broadband RNDIS device, fc:dd:55:ff:ff:ff
usbcore: registered new interface driver rndis_host
rndis_host 3-2:1.0 wwxfcdd55ffffff: renamed from wwan0

As you can see with 6.12 it's seen as a Ethernet/RNDIS device, but with 6.13 it's seen as a Mobile Broadband RNDIS device

This seems to be a regression from 67d1a8956d2d62fe6b4c13ebabb57806098511d8

Note that the device is establishing the connection itself and also act as a WiFi access point. The computer is not involved in the ppp connection at all.

Can something be done?

Kind regards,

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https://bugzilla.kernel.org/show_bug.cgi?id=220044

--- Comment #1 from Iru Cai ([email protected]) ---
I'm using Linux 6.14.6 and it seems to be fixed. In earlier kernel I found this bug when I use my phone to share the internet and saw the interface is renamed from wwan0, and now the interface is usb0.

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https://bugzilla.kernel.org/show_bug.cgi?id=220044

Laurent Bigonville ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #2 from Laurent Bigonville ([email protected]) --- OK, the problematic code has been reverted, this can be closed now

Tested with 6.15-RC7

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