Non-Transparent Bridge support

modulename: ntb.ko

configname: CONFIG_NTB

Linux Kernel Configuration
└─>Device Drivers
└─>PCI support
└─>Non-Transparent Bridge support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
The PCI-E Non-transparent bridge hardware is a point-to-point PCI-E bus
connecting 2 systems. When configured, writes to the device's PCI
mapped memory will be mirrored to a buffer on the remote system. The
ntb Linux driver uses this point-to-point communication as a method to
transfer data from one system to the other.

If unsure, say N.

source code: