Tag driver for Realtek 4 byte protocol A tags

modulename: tag_rtl4_a.ko

configname: CONFIG_NET_DSA_TAG_RTL4_A

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Distributed Switch Architecture
└─>Tag driver for Realtek 4 byte protocol A tags
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Say Y or M if you want to enable support for tagging frames for the
Realtek switches with 4 byte protocol A tags, sich as found in
the Realtek RTL8366RB.

source code:
net/dsa/tag_rtl4_a.c