Qualcomm Atheros AR9331 Ethernet switch support

modulename: ar9331.ko

configname: CONFIG_NET_DSA_AR9331

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Distributed Switch Architecture drivers
└─>Qualcomm Atheros AR9331 Ethernet switch support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
This enables support for the Qualcomm Atheros AR9331 built-in Ethernet
switch.

source code:
drivers/net/dsa/qca/ar9331.c