Tag driver for Realtek 8 byte protocol 4 tags

modulename: tag_rtl8_4.ko

configname: CONFIG_NET_DSA_TAG_RTL8_4

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Distributed Switch Architecture
└─>Tag driver for Realtek 8 byte protocol 4 tags
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Say Y or M if you want to enable support for tagging frames for Realtek
switches with 8 byte protocol 4 tags, such as the Realtek RTL8365MB-VC.

source code:
net/dsa/tag_rtl8_4.c