CONFIG_LIBETH (not configurable)

modulename: libeth.ko

configname: CONFIG_LIBETH

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>LIBETH
In linux kernel since version 4.19.318 (release Date: 2024-07-18)  
libeth is a common library containing routines shared between several
drivers, but not yet promoted to the generic kernel API.

source code: