CONFIG_OCTEONTX2_MBOX (not configurable)

modulename: rvu_mbox.ko

configname: CONFIG_OCTEONTX2_MBOX

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>OCTEONTX2_MBOX
In linux kernel since version 4.2 (release Date: 2015-08-30)  
source code:
drivers/net/ethernet/marvell/octeontx2/af/