Messages in this thread | | | From | Aleksander Morgado <> | Date | Thu, 8 Apr 2021 22:05:49 +0200 | Subject | Re: [PATCH net-next v9 1/2] net: Add a WWAN subsystem |
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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
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