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

Pradeep Gopanapalli pradeep.gopanapalli at broadcom.com
Mon Jan 6 04:03:03 UTC 2025 

Hello Daniele,

Thanks for the reply.
Yes I had to add a similar patch for modemmanager.common for the mux
interface to work.
After following the steps given below I am able to dial into Multiplex
interfaces.
Now I need to figure out how to integrate maintaining state machines of
these interfaces into
our modem scripts.
Also does modemmanager allow combination of non-multiplex and multiplex
interface at same time?

Here are steps followed for successful multiplex interface creation

>>

mmcli -m any --command='AT#DUALAPN=1'

mmcli -m a --command='AT+WS46=36'

mmcli -m any --set-current-bands=ngran-71

mmcli -m any --set-allowed-modes=5g

<Delete any non multiplex bearers>
#mmcli -m any --simple-connect="multiplex=required,apn=<>"
#mmcli -m any --set-allowed-modes=5g
#mmcli -m any
--simple-connect="multiplex=required,profile-id=3,ip-type=ipv4"

Thanks,
Pradeep G
<< Disconnect bearer related to non-multiplex>
On Fri, Jan 3, 2025 at 1:52 AM Daniele Palmas <dnlplm at gmail.com> wrote:

> Hello Pradeep,
>
> Il giorno ven 3 gen 2025 alle ore 02:37 Pradeep Gopanapalli
> <pradeep.gopanapalli at broadcom.com> ha scritto:
> >
> > 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'"
> >
>
> looks like something similar to the issue describe at
> http://paldan.altervista.org/openwrt-modemmanager-and-a-multiplexing-issue/
>
> though the suspicious line is a bit different:
>
> hotplug: add network interface qmapmux0.0: event ignored: couldn't get
> physical device sysfs path
>
> Anyway, I fixed the issue reported above with
> https://github.com/openwrt/packages/pull/23551
>
> If that does not work for you it could be a starting point for further
> investigation.
>
> Regards,
> Daniele
>
> >
> > >>
> >
> > = 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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