If a task is marked as defer-until-suggested (e.g. a wwan port) and there was
already a 'best' plugin set in the parent device, use it to complete the
deferred task.
This may happen in e.g. MBIM devices if the WWAN port arrives later than the
already probed /dev/cdc-wdm character device.
Icera-based Nokia modems may reply correctly to the Icera probing only in some
AT ports, not in all. In order to handle this situation we override the final
plugin selected to be the Icera-based one if we find that the mismatched plugins
have the 'icera-allowed' and 'icera-forbidden' filters.
https://bugzilla.gnome.org/show_bug.cgi?id=703022
The specific case:
* Modem exposes cdc-wdm port, Generic plugin probes it successfully as QMI.
* Modem exposes new ports, including the wwan one. All ttys fail probing
because they're neither AT nor QCDM (CnS in this case).
* The wwan port ends up without a port being suggested and is not grabbed.
The root cause of this is that we do not propagate the suggested plugin to newly
added ports when it's the Generic one. If it wasn't the Generic one, the newly
added ports would start with the suggested one for probing.
Now, handle this by looking for the device-specified plugin when the port
probing ends without a specific port given. If there is such a device-specified
plugin accept the port, and otherwise, reject it.
For the case where we just get a device with all net ports (i.e. all deferred
until result suggested), just abort the probing if the minimum probing time is
consumed.
For each port, we will construct the list of plugins to test with. In that list
we will include those plugins which are likely to handle a given port, so we
will skip all those which aren't.
To see if a plugin is likely or not, we will run the pre-probing filters before
adding them to the list, with the new `mm_plugin_discard_port_early()'. This
method will return one of these hints:
* UNSUPPORTED: The plugin will not be able to handle this port.
* MAYBE: The plugin may handle this port.
* LIKELY: The plugin may (very likely) handle this port.
* SUPPORTED: If any plugin should support the port, this is it.
Plugins reported to be 'likely' supporting the port will be probed before the
ones reported just as 'maybe'.
If a plugin reports 'supported' only that one and the fallback generic ones will
be tried.
Logging which are the reasons for a plugin to filter a given port really help
when trying to debug user issues. Some other general logging improvements also
done.
Some modems, e.g. Huawei E367, will probe first the QMI port and for some reason
it doesn't report a proper VID/PID so the Generic plugin is the one finally
accepting that port. When we probe the AT ports afterwards we already got the
Generic plugin as suggestion, and we end up not grabbing the proper primary and
secondary ports as we skipped the AT^GETPORTMODE reply.
So, from now on the Generic plugin is never suggested to other probes; except
for the case where we need the suggestion to finish a probing task which was
'deferred until suggested'.
Also, the device-level plugin can now be overwritten, if and only if, the
previously set plugin was the Generic one.
If a port support task was deferred until suggested, do not assume that the
suggested plugin actually supports the port, instead re-launch support check.
This covers the cases where a net port appears in a modem which only supports
AT ports (e.g. Nokia case).
Instead of providing a method to get if a plugin is requesting to get sorted
last, we provide a way to comparing two plugins, compatible with the
GCompareFunc required in g_list_sort().
The plugin manager no longer needs to take care of keeping track of which probes
are being run and to which physical device they correspond, as the upper layer's
`MMDevice' already does this. This simplifies the internal logic quite a lot, as
we can now easily suggest plugins to the remaining port probes of the same
device directly.
We no longer need to query the plugin manager whether we're checking support for
a specific port, as the ports are now grabbed only once in the MMDevice, and
therefore we ensure that supports check is launched only once in the
PluginManager for that specific port.
Also, we no longer need to query the plugin manager whether we're checking
support for a given device, as the logic to check when all ports of the device
are probed is now maintained internally.
The new `mm_plugin_manager_find_device_support()' will be an async method which
waits for ports to be added in the given `MMDevice'. As soon as all added ports
are probed, the device support check is considered finished.
If deferring tasks until result suggested, and we never got a suggestion, the
tasks may have been left deferred in loop forever. We now remove the defer
timeout in the case of waiting for suggestion, and ensure that we cancel tasks
if the last valid probing ended without best plugin found.
We chain up the Generic plugin created MMBroadbandModem objects within the
GDBusObjectManagerServer in MMManager, so that they get properly exported in
DBus.
Support checks are fully asynchronous and result is always reported when the
check is considered ready, so in-progress replies to
`mm_plugin_supports_port_finish()' don't make any sense.
There is no single case where more than one plugin may end up wanting to support
a given port, and therefore there is no need to report the numeric support level
when reporting SUPPORTED.
The new mm_plugin_manager_is_finding_port_support() allows to check whether the
Plugin Manager is looking for support in a specific port.
The new mm_plugin_manager_is_checking_device_support() allows to check whether
the Plugin Manager is looking for support in any port of a given device.
As soon as the first support check of a port in a given device finishes with a
valid best plugin and level > 0, propagate the result to other support tasks
corresponding to ports in the same physical device.
Previously, this propagation of support check results was only done once the
port was grabbed by a plugin, not just when the plugin reported that it
supported it. This change in behaviour isn't probably a big deal, as there
should not be any case where a plugin says it supports a port and then cannot
grab it.
We will keep a reference to each of the support checks currently in progress,
grouped by physical device path. The stored SupportsInfo structs as well as
the support check operations, are guaranteed to be kept valid as long as the
Plugin Manager exists. Or in other words, the Plugin Manager cannot be disposed
if there is still an ongoing supports check operation.
The new `mm_plugin_manager_find_port_support()' method requests the Plugin
Manager to iterate over the list of plugins internally handled, launching
supports task for the given port in each of them.
The method is fully asynchronous, and the result can be retrieved with
`mm_plugin_manager_find_port_support_finish()' once the operation is ready.
