Probing MBIM ports on devices with both MBIM and other cdc-wdmX devices

[Bjørn Mork]

Probably more of a MM question, but this list needs som traffic :)

Just had a H5321gw user test MM with libmbim.  And one of the odd things
happening was this (I've stripped out some lines inbetween here):

> <debug> [1367697017.475613] [mm-plugin.c:772] mm_plugin_supports_port(): (Ericsson MBM) [cdc-wdm0] probe required: 'mbim'
> <debug> [1367697017.482773] [mm-port-probe.c:1331] mm_port_probe_run(): (usbmisc/cdc-wdm0) launching port probing: 'mbim'
> <debug> [1367697018.137668] [mm-plugin.c:772] mm_plugin_supports_port(): (Ericsson MBM) [cdc-wdm2] probe required: 'mbim'
> <debug> [1367697018.176998] [mm-port-probe.c:1331] mm_port_probe_run(): (usbmisc/cdc-wdm2) launching port probing: 'mbim'
> <debug> [1367697018.407780] [mm-plugin.c:772] mm_plugin_supports_port(): (Ericsson MBM) [cdc-wdm1] probe required: 'mbim'
> <debug> [1367697018.427487] [mm-port-probe.c:1331] mm_port_probe_run(): (usbmisc/cdc-wdm1) launching port probing: 'mbim'
> <debug> [1367697018.618970] [mm-port-probe.c:317] mm_port_probe_set_result_mbim(): (usbmisc/cdc-wdm0) port is not MBIM-capable
> <debug> [1367697018.623238] [mm-port-probe.c:317] mm_port_probe_set_result_mbim(): (usbmisc/cdc-wdm2) port is not MBIM-capable
> <debug> [1367697018.627512] [mm-port-probe.c:317] mm_port_probe_set_result_mbim(): (usbmisc/cdc-wdm1) port is not MBIM-capable

I did not expect the two AT command cdc-wdmX ports to be MBIM
probed. But looking again at the probe filter, I see that it is per
device and not per port:
http://cgit.freedesktop.org/ModemManager/ModemManager/commit/?id=6b379e525dbcc117a82fb367a6db2146042880ab

I guess that's necessary to support Huawei QMI modems using the 3.4 and
3.5 drivers.   But it doesn't look good.  Why not launch an AT probe on
all ports as well?  It would have succeeded for two of the ports
above... 

(Still have to find out why the probing failed on the actual MBIM port.)



Bjørn