Hey, > > * Note: Userspace tools like ModemManager are able to link control > ports and netdev by looking at the sysfs hierarchy, it's fine for > simple connection management, but probably not enough for 'multi PDN' > support for which devices may have multiple netdev and ports > targetting different 'PDN contexts'... > ModemManager is happy with those devices exposing multiple netdevs (even connecting different net ports to different contexts/bearers and such), as long as we can bind all those ports together to the same "modem device". The sysfs hierarchy has been enough for now for that purpose; or better said, without the sysfs hierarchy it would not have worked properly. E.g. there are some drivers out there allowing to instantiate virtual net ports from a master net port; without proper links in sysfs to link those virtual net ports to the master net port, the setup would be extremely unstable. -- Aleksander https://aleksander.es
