Huawei E820W MBIM issue

[Prathmesh Prabhu]

The commit for posterity:
http://cgit.freedesktop.org/libmbim/libmbim/commit/?id=6f2a64292e16bd8a8e6c6b79d898a693eb372b45


On Tue, Jun 10, 2014 at 8:40 AM, Aleksander Morgado <
aleksander at aleksander.es> wrote:

> On Tue, Jun 10, 2014 at 4:29 PM, Aleksander Morgado
> <aleksander at aleksander.es> wrote:
> > On Tue, Jun 10, 2014 at 4:12 PM, Dan Williams <dcbw at redhat.com> wrote:
> >> Causes the device caps query to fail, and the device ends up with "none"
> >> capabilities.  Any ideas what's going on?  MM from git master today,
> >> libmbim from May 27th.  Looks like MM is receiving an unexpected
> >> message?
> >>
> >> Dan
> >>
> >
> > That is weird.... see below.
> >
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Queried max control message size:
> >> 1536
> >
> >
> > So, you send a MBIM Open message (transaction 1)....
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Sent message...
> >> <<<<<< RAW:
> >> <<<<<<   length = 16
> >> <<<<<<   data   = 01:00:00:00:10:00:00:00:01:00:00:00:00:06:00:00
> >> ModemManager[2074]: [/dev/cdc-wdm0] Sent message (translated)...
> >> <<<<<< Header:
> >> <<<<<<   length      = 16
> >> <<<<<<   type        = open (0x00000001)
> >> <<<<<<   transaction = 1
> >> <<<<<< Contents:
> >> <<<<<<   max_control_transfer = 1536
> >
> >
> > And you get the MBIM Open Done reply (for transaction 1)....
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Received message...
> >>>>>>>> RAW:
> >>>>>>>>   length = 16
> >>>>>>>>   data   = 01:00:00:80:10:00:00:00:01:00:00:00:00:00:00:00
> >> ModemManager[2074]: <debug> [1402407677.718576]
> >> [mm-broadband-modem-mbim.c:1281] parent_initialization_started_ready():
> >> Couldn't start parent initialization: Couldn't open ports during modem
> >> initialization: Couldn't get primary port
> >> ModemManager[2074]: <debug> [1402407677.718936]
> >> [mm-broadband-modem-mbim.c:210] modem_load_current_capabilities():
> >> loading current capabilities...
> >
> > And you think you're good to go as the Open is ready, so you send a
> > new MBIM request (transaction 2)....
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Sent message...
> >> <<<<<< RAW:
> >> <<<<<<   length = 48
> >> <<<<<<   data   =
> >>
> 03:00:00:00:30:00:00:00:02:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:01:00:00:00:00:00:00:00:00:00:00:00
> >> ModemManager[2074]: [/dev/cdc-wdm0] Sent message (translated)...
> >> <<<<<< Header:
> >> <<<<<<   length      = 48
> >> <<<<<<   type        = command (0x00000003)
> >> <<<<<<   transaction = 2
> >> <<<<<< Fragment header:
> >> <<<<<<   total   = 1
> >> <<<<<<   current = 0
> >> <<<<<< Contents:
> >> <<<<<<   service =
> >> 'basic-connect' (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
> >> <<<<<<   cid     = 'device-caps' (0x00000001)
> >> <<<<<<   type    = 'query' (0x00000000)
> >
> >
> > And, hey, you get yet another Open Done message for transaction 1; ok,
> > we can discard this one...
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Received message...
> >>>>>>>> RAW:
> >>>>>>>>   length = 16
> >>>>>>>>   data   = 01:00:00:80:10:00:00:00:01:00:00:00:00:00:00:00
> >> ModemManager[2074]: [/dev/cdc-wdm0] No transaction matched in received
> >> message
> >
> > But wtf, you still get yet another Open Done message, this time for
> > transaction 2?
> >
> >> ModemManager[2074]: [/dev/cdc-wdm0] Received message...
> >>>>>>>> RAW:
> >>>>>>>>   length = 16
> >>>>>>>>   data   = 01:00:00:80:10:00:00:00:02:00:00:00:00:00:00:00
> >> ModemManager[2074]: mbim_message_command_done_get_result: assertion
> >> 'MBIM_MESSAGE_GET_MESSAGE_TYPE (self) == MBIM_MESSAGE_TYPE_COMMAND_DONE'
> >> failed
> >
> > I don't think I've covered this case in libmbim, truth be told. We
> > should definitely check if the request we expect matches not only
> > transaction ID but also the request type that we expect.
> >
> > Don't know why this modem does this, though...
> >
>
>
> Pushed a patch to handle this issue to git master; Dan tested it already.
>
> Cheers!
>
> --
> Aleksander
> https://aleksander.es
> _______________________________________________
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>



-- 
Regards,
Prathmesh
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