Issue with 5G Slices and Bearer Connection Failure on Telit FN990 Modem

Fri Jan 3 01:10:31 UTC 2025

Hello Dan,

First of all Happy new year and thanks for the reply.
On further debugging it looks like we need a "rmnet" driver for  Netlink
creation as slice interfaces.
https://dri.freedesktop.org/docs/drm/networking/device_drivers/cellular/qualcomm/rmnet.html

However Native Opernwrt -23.05 didn't had this module as part of packages,
so i had to compile it as a module
Kernel : 5.15.168

I followed these steps
-mmcli -m a --command='AT+WS46=36'
insmod rmnet.ko

<Delete all non-mux bearers>

mmcli -m any --simple-connect="multiplex=requested,profile
-id=1,ip-type=ipv4v6"

*And qmapmux0.0 creation failed with "imed out waiting for link port
'net/qmapmux0.0'"*

>>

= 1#012<<<<<<   value      = 03#012<<<<<<   translated =
ipv4-or-ipv6#012<<<<<< TLV:#012<<<<<<   type       = "Profile Name"
(0x10)#012<<<<<<   length     = 8#012<<<<<<   value      =
70:72:6F:66:69:6C:65:31#012<<<<<<   translated = profile1#012
2025-01-03T01:07:05.468 DEBUG  daemon ModemManager[32225]: <dbg>
[modem0/cdc-wdm0/qmi] multiplex support already available when setting up
data format
2025-01-03T01:07:05.468 DEBUG  daemon ModemManager[32225]: <dbg>
[modem0/cdc-wdm0/qmi] Creating RMNET link with flags: ingress-map-cksumv5,
egress-map-cksumv5
2025-01-03T01:07:05.486 DEBUG  daemon ModemManager[32225]: <dbg> Using
dynamic mux ID 1
2025-01-03T01:07:05.489 NOTICE daemon ModemManager[32225]: <msg>
[modem0/bearer2] net link qmapmux0.0 created (mux id 1)
2025-01-03T01:07:05.489 DEBUG  daemon ModemManager[32225]: <dbg> [modem0]
waiting for port 'net/qmapmux0.0'...
2025-01-03T01:07:05.492 INFO   daemon linkd[7283]: create None(qmapmux0.0):
state=->down, oper=->down, carrier=->1
2025-01-03T01:06:47.253 WARNIN user   kernel:[1451352.659164] ethtool: net:
disabled offload features for qmapmux0.0
2025-01-03T01:07:05.614 INFO   daemon ModemManager[50632]: hotplug: add
network interface qmapmux0.0: event ignored: couldn't get physical device
sysfs path
2025-01-03T01:07:07.991 WARNIN daemon ModemManager[32225]: <wrn>
[modem0/bearer2] connection attempt #1 failed: Timed out waiting for link
port 'net/qmapmux0.0'
2025-01-03T01:07:07.991 NOTICE daemon ModemManager[32225]: <msg> [modem0]
state changed (connecting -> registered)
2025-01-03T01:07:07.992 NOTICE daemon ModemManager[32225]: <msg>
[modem0/bearer2] connection #1 finished: duration 0s
2025-01-03T01:07:07.992 WARNIN daemon ModemManager[32225]: <wrn> [modem0]
couldn't connect bearer: Timed out waiting for link port 'net/qmapmux0.0'
2025-01-03T01:07:07.997 INFO   daemon linkd[7283]: change None(qmapmux0.0):
state=down->down, oper=down->down, carrier=1->1
2025-01-03T01:07:08.004 INFO   daemon ModemManager[50807]: hotplug: remove
network interface qmapmux0.0: event processed
2025-01-03T01:07:08.015 DEBUG  daemon ModemManager[32225]: <dbg>
[base-manager] kernel event reported:
2025-01-03T01:07:08.015 DEBUG  daemon ModemManager[32225]: <dbg>
[base-manager]   action:    remove
2025-01-03T01:07:08.015 DEBUG  daemon ModemManager[32225]: <dbg>
[base-manager]   subsystem: net
2025-01-03T01:07:08.015 DEBUG  daemon ModemManager[32225]: <dbg>
[base-manager]   name:      qmapmux0.0
2025-01-03T01:07:08.015 DEBUG  daemon ModemManager[32225]: <dbg>
[base-manager]   uid:       n/a

 Thanks,

Pradeep G

On Tue, Dec 31, 2024 at 10:44 AM Dan Williams <dan at ioncontrol.co> wrote:

> On Sun, 2024-12-29 at 19:08 -0800, Pradeep Gopanapalli wrote:
> > Hello,
> > I am trying to establish multiple 5G multiplex slices on a Telit
> > FN990 modem running in QMI mode. These 5G slices represent multiple
> > PDNs managed by ModemManager (via mmcli).
> >
> > When using the "--test-multiplex-requested" option, the bearer setup
> > fails with the following Netlink error:
> > GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dquar
> > k.Code0: failed to create net link for device: failed to add link for
> > device: Could not allocate link: Failed to add link with mux id 1:
> > Netlink message with transaction 9 failed
>
> Unfortunately libqmi-glib doesn't print out the actual error we get
> from netlink, which I've fixed here:
>
> https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/merge_requests/389
>
> would you be able to apply that patch locally and reproduce the issue,
> so that we can figure out the actual error code netlink is returning?
>
> Thanks,
> Dan
>
> >
> > Environment:
> >  * Modem: Telit FN990A28 in QMI mode
> >  * ModemManager: 1.22.0
> >  * libqmi: 1.34.0-2
> >  * libmbim: 1.30.0-2
> >  * Kernel: 5.15.150
> >  * OpenWrt: Based on 22.03 using netifd
> > Debug Logs During Bearer Connection:
> > (PFA message_modem_debug)
> > 2024-12-28T00:38:03.709 DEBUG daemon ModemManager[9676]:
> > [1735346283.709521] [modem0/bearer1] connecting...
> > 2024-12-28T00:38:03.709 NOTICE daemon ModemManager[9676]:
> > [1735346283.709796] [modem0] state changed (registered -> connecting)
> > 2024-12-28T00:38:03.709 DEBUG daemon ModemManager[9676]:
> > [1735346283.709904] [modem0/bearer1] launching connection with QMI
> > port (cdc-wdm0) and data port (wwan0) (multiplex requested)
> > 2024-12-28T00:38:03.709 DEBUG daemon ModemManager[9676]:
> > [1735346283.709916] [cdc-wdm0/qmi] bringing down data interface
> > 'wwan0'
> > 2024-12-28T00:38:03.710 DEBUG daemon ModemManager[9676]:
> > [1735346283.710309] [cdc-wdm0/qmi] resetting expected kernel data
> > format to 802.3 in data interface 'wwan0'
> > 2024-12-28T00:38:03.897 WARN daemon ModemManager[9676]:
> > [1735346283.897197] [modem0/bearer1] connection attempt #1 failed:
> > failed to create net link for device: failed to add link for device:
> > Could not allocate link: Failed to add link with mux id 1: Netlink
> > message with transaction 1 failed
> > 2024-12-28T00:38:03.898 NOTICE daemon netifd: CELL1 (19170): error:
> > couldn't connect the modem:
> > 'GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dqua
> > rk.Code0: failed to create net link for device: failed to add link
> > for device: Could not allocate link: Failed to add link with mux id
> > 1: Netlink message with transaction 1 failed'
> > Similar Issue Reported:
> > This issue has been reported in the following GitLab issue:
> > GitLab ModemManager Issue #533, but I have not seen a resolution for
> > it.
> > Reference Links:
> >  * ModemManager Mailing List - March 2022
> > Any assistance or suggestions on resolving this issue would be
> > greatly appreciated.
> > Thanks,
> > Pradeep G
> >
> >
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