Consider using libComposite for USB ethernet

[JonTheNiceGuy]

Hi,

I read in your blog post that you're using g_ether to expose the USB port as an ethernet adapter. In my experiments a few years ago, I found the combined RNDIS 6 and ECM/CDC with libComposite provided a driverless experience.

I've not worked on it for a couple of years, but I thought it might be more helpful in the future for your project?

https://jon.sprig.gs/blog/post/2243

There is also a git repo for it, which includes setting up a bridged network to provide a single IP for both RNDIS or ECM/CDC interfaces.

Of course, you're also very welcome to ignore this! I don't use my Pi for that any more, but I found there wasn't much in the way of research or documentation when I was poking at it, so I hope my project can help you!

Very best of luck with this project, and feel free to reach out if you think anything I have there can help you!

(Written from my phone, please excuse typos, missing links or errors!)

[XECDesign]

I've added @roliver-rpi's gt package build to our apt repo and it seemed to work quite well with a fairly simple config file (ignore the {{}} bits, that's just because I was using a jinj2 template).:

attrs : {
    idVendor = 0x1D6B;
    idProduct = 0x0104;
};
strings = (
    {
        lang = 0x409;
        manufacturer = "Raspberry Pi";
        product = "USB Gadget";
        serialnumber = "{{ gadget_serial }}";
    }
);
functions : {
    ecm_usb0 : {
        instance = "usb0";
        type = "ecm";
        dev_addr  = "{{ dev_mac }}";
        host_addr = "{{ host_mac }}";
    };
};
configs = (
    {
        id = 1;
        name = "c";
        max_power = 250;
        strings = (
            {
                lang = 0x409;
                configuration = "Config 1";
            }
        );
        functions = (
            { name = "ecm.usb0"; function = "ecm_usb0"; }
        );
    }
);

I seem to recall a brief discussion about it? Was the issue that it would break Windows or MacOS support?

[roliver-rpi]

I believe it's Windows that doesn't support ECM, only RNDIS.