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

Netronome(R) NFP4000/NFP6000 VF NIC driver

modulename: nfp_netvf.ko

configname: CONFIG_NFP_NETVF

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>Netronome(R) NFP4000/NFP6000 VF NIC driver
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This driver supports SR-IOV virtual functions of
the Netronome(R) NFP4000/NFP6000 cards working as
a advanced Ethernet NIC.

source code: