This driver implements Ethernet style communication, in one of
several ways:

- The "Communication Device Class" (CDC) Ethernet Control Model.
That protocol is often avoided with pure Ethernet adapters, in
favor of simpler vendor-specific hardware, but is widely
supported by firmware for smart network devices.

- On hardware can't implement that protocol, a simple CDC subset
is used, placing fewer demands on USB.

- CDC Ethernet Emulation Model (EEM) is a newer standard that has
a simpler interface that can be used by more USB hardware.

RNDIS support is an additional option, more demanding than than
subset.

Within the USB device, this gadget driver exposes a network device
"usbX", where X depends on what other networking devices you have.
Treat it like a two-node Ethernet link: host, and gadget.

The Linux-USB host-side "usbnet" driver interoperates with this
driver, so that deep I/O queues can be supported. On 2.4 kernels,
use "CDCEther" instead, if you're using the CDC option. That CDC
mode should also interoperate with standard CDC Ethernet class
drivers on other host operating systems.

Say "y" to link the driver statically, or "m" to build a
dynamically linked module called "g_ether".

source code:

drivers/usb/gadget/