default or selected kernelversion does not have config value CONFIG_BE2NET_VXLAN.
Result is shown for kernelversion 6.4.14

VXLAN offload support on be2net driver

configname: CONFIG_BE2NET_VXLAN

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>VXLAN offload support on be2net driver
In linux kernel since version 3.15 (release Date: 2014-06-08)  
Say Y here if you want to enable VXLAN offload support on
be2net driver.