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rndis_host: Flag RNDIS modems as WWAN devices

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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).

Fixes: 63ba395cd7 ("rndis_host: support Novatel Verizon USB730L")
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://patch.msgid.link/20250325095842.1567999-1-lkundrak@v3.sk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lubomir Rintel 2025-03-25 10:58:41 +01:00 committed by Jakub Kicinski
parent 23f0080761
commit 67d1a8956d
1 changed files with 14 additions and 2 deletions
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16
drivers/net/usb/rndis_host.c
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@ -630,6 +630,16 @@ static const struct driver_info zte_rndis_info = {
.tx_fixup = rndis_tx_fixup,
};
static const struct driver_info wwan_rndis_info = {
.description = "Mobile Broadband RNDIS device",
.flags = FLAG_WWAN | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
.bind = rndis_bind,
.unbind = rndis_unbind,
.status = rndis_status,
.rx_fixup = rndis_rx_fixup,
.tx_fixup = rndis_tx_fixup,
};
/*-------------------------------------------------------------------------*/
static const struct usb_device_id products [] = {
@ -666,9 +676,11 @@ static const struct usb_device_id products [] = {
USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
.driver_info = (unsigned long) &rndis_info,
}, {
/* Novatel Verizon USB730L */
/* Mobile Broadband Modem, seen in Novatel Verizon USB730L and
* Telit FN990A (RNDIS)
*/
USB_INTERFACE_INFO(USB_CLASS_MISC, 4, 1),
.driver_info = (unsigned long) &rndis_info,
.driver_info = (unsigned long)&wwan_rndis_info,
},
{ }, // END
};