MicroSemi Switchtec Non-Transparent Bridge Support

modulename: ntb_hw_switchtec.ko

configname: CONFIG_NTB_SWITCHTEC

Linux Kernel Configuration
└─>Device Drivers
└─>Non-Transparent Bridge support
└─>MicroSemi Switchtec Non-Transparent Bridge Support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Enables NTB support for Switchtec PCI switches. This also
selects the Switchtec management driver as they share the same
hardware interface.

If unsure, say N.

source code:
selects
CONFIG_PCI_SW_SWITCHTEC

depends
CONFIG_NTB