qmicli working for EM7455

[Brandon Lee]

For the dhcp,
i run the qmi-network command for the modem, and then restart
systemd-networkd to get IP on wwan*.

Is there another command i should use to get ip on wwan interface?

For the driver change, yes. I am aware i can not change driver name. I do
not want to do this. The kernel is now selecting the driver i want, qmi,
since i changed the composition on the modem to qmi.

I will give netdev a try in assigning /dev port by unique name ATTR. To
keep startup script stable for modems.

On Wed, Apr 1, 2020, 12:57 AM Bjørn Mork <bjorn at mork.no> wrote:

> Brandon Lee <blee0518 at gmail.com> writes:
>
> > also Bjorn, you are obviously highly more skilled in all this than I am.
> I
> > did not even think to dig into the code, and i probably wouldnt
> understand
> > most of it.  I am curious, what you would recommend over systemd to
> > acquire an IP from the wwan interfaces using dhcp?
>
> I don't recommend DHCP for MBIM or QMI devices.  The DHCP server is a
> sloppy workaround added to the modem firmware. Sometimes. It may or may
> not work.  It's mostly untested (by vendor or anyone else) for MBIM
> devices, since Windows doesn't use it.
>
> Us the native managment protocol (QMI or MBIM) to get the address info
> and let NetworkManager, or similar alternatives, configure the IP
> interface accordingly.
>
> > One final question for Bjorn, as i am taken back by his detail in coding.
> > I am having issues with the port being assigned to the proper cdc-wdm*.
> > Most of the time it boots with the same assignment but maybe 1 in 10 it
> > switches them. I tried a symlink rule but it didnt help. Can you give
> > proper advice on how to assign the device to a cdc-wdm on reboot/startup?
> > what i tried and it didnt work:
> >
> > # assign module1 to cdc-wdm0
> > KERNEL=="cdc-wdm0", \
> > ATTR{idProduct}=="9071", \
> > SYMLINK+="cdc-wdm0"
> >
> > Looking to try this but it would be a port assignment not device to udev
> > assignment
> > KERNEL=="cdc-wdm0*", KERNELS=="1-4:1.0", SYMLINK+="cdc-wdm0"
>
> As Aleksander already explained:  You cannot change this name.  It is
> assigned by the driver/kernel based on order of discovery. Neither the
> driver nor the tools support renaming.
>
> But what you can do is look up the character device name based on the
> network device name, which systemd will keep stable for you based on bus
> and port. If not, then it is possible to create an udev rule to achive a
> stable netdev name.
>
> If your cdc_mbim or qmi_wwan netdev is named "foo0bar3", then the
> matching cdc-wdmX device is
>
>  $ basename /sys/class/net/foo0bar3/device/usbmisc/*
>  cdc-wdm42
>
>
>
> Bjørn
>
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