CONFIG_NET_DSA_SMSC_LAN9303 (not configurable)

modulename: lan9303-core.ko

configname: CONFIG_NET_DSA_SMSC_LAN9303

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>NET_DSA_SMSC_LAN9303
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This enables support for the Microchip LAN9303/LAN9354 3 port ethernet
switch chips.

source code: