Question about PCIe networks

[Eduardo Morras]

Hello, don't know if this has been discussed but here it goes.

I have read recently this

http://www.wwpi.com/hardware/hardware/6540-ethernet-tunneling-through-pci-express-inter-processor-communication-low-latency-storage-io

It's about using PCIe to connect 2 servers directly, without using 
ethernet or other hardware.

Can it be done in FreeBSD? What is needed to know?

TIA