CONFIG_USB_U_ETHER (not configurable)

modulename: u_ether.ko

configname: CONFIG_USB_U_ETHER

Linux Kernel Configuration
└─>Device Drivers
└─>USB support
└─>USB Gadget Support
└─>USB_U_ETHER
In linux kernel since version 3.11 (release Date: 2013-09-02)  
source code:
drivers/usb/gadget/u_ether.c