DSS usage

Arnaud Desmier adesmier at sequans.com
Fri Apr 11 00:51:41 PDT 2014

On paper this seems to be good but my main concern is that everybody has 
to play game (any connection manager) and usual command line tools (if*, 
...) that bring interface up/down would break this, no?


On 11/04/2014 08:56, Aleksander Morgado wrote:
> On Fri, Apr 11, 2014 at 4:32 AM, Arnaud Desmier <adesmier at sequans.com> wrote:
>> If we continue using VLAN we still depends on wwan interface status to
>> access DSS channels. So we have to link NetworkManager to libmbim to avoid
>> putting down wwan interface if there is any DSS channel open.
>> What about opening DSS channel when wwan interface is down?
> If there is a single process taking care of bringing up/putting down
> the MBIM WWAN interfaces, then everything would be more or less
> solved, as that process could take into account which other processes
> requested to have the interface up or down. Still believe that the
> mbim-proxy could do that; e.g. by managing the up/down state itself
> via netlink. The proxy would detect when a Connect succeeded and
> directly ifup the interface itself, and when a Disconnect succeeds it
> can also bring it down. At the same time, it could also manage the DSS
> sessions, and if there is a session ongoing it would make sure that
> the interface is kept up (or something like that). NetworkManager
> would just need to avoid bringing it up/down itself.
> Them, in libmbim we could have a new API like:
> gint
> mbim_dss_activate (
>      const MbimUuid *device_service_id,
>      guint32 dss_session_id);
> This method takes a service ID and session ID (for the  DSS connect
> command) and returns an open file descriptor (or a higher level
> GObject which contains more info, but that's the idea). The
> intermediate mbim-proxy could take care of exposing a temporary socket
> behind that file descriptor, and also take care of managing the whole
> stream within the channel, removing unneeded ethernet headers and
> hiding all the VLAN handling to other processes, which would only play
> with the fd.
> Isn't this a possible path to take? Maybe I'm missing something?


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