differences between with rmnet and qmi_wwan

[Alexander 'lynxis' Couzens]

Hi,


I'm looking into the different modes of qmi user traffic.
Currently I'm only using usb based modems, but would like to support
pcie based modems in near future.

qmi_wwan can be configured via /sysfs [1]. (add_mux del_mux pass_through raw_ip)
rmnet devices can be connected to the wwan0 interface with `ip link` or netlink.

What are the differences between rmnet and qmi_wwan regarding the user traffic?
Is rmnet just more flexible and generic way to support qmap?
Are there features supported in rmnet which are missing in qmi_wwan? (qmapv4?)

So far I understand, to use rmnet on top of qmi_wwan I only need to set raw-ip and passthrough, correct?
(Leaving the QMI related calls aside to CTL/WDA/WDS, set MTU high).

I would guess all 4G/LTE modems support raw-ip.


Best Regards,
lynxis

[1] /sys/class/net/wwan0/qmi/