default or selected kernelversion does not have config value CONFIG_I40E_FCOE.
Result is shown for kernelversion 6.4.14

Fibre Channel over Ethernet (FCoE)

configname: CONFIG_I40E_FCOE

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Fibre Channel over Ethernet (FCoE)
In linux kernel since version 3.18.2 (release Date: 2015-01-08)  
Say Y here if you want to use Fibre Channel over Ethernet (FCoE)
in the driver. This will create new netdev for exclusive FCoE
use with XL710 FCoE offloads enabled.

If unsure, say N.