PVE2

vi /etc/network/interfaces

auto ibp2s0
iface ib0p2s inet static
        address 192.168.199.2/24
        mtu 65520
        pre-up modprobe ib_ipoib
        pre-up echo connected > /sys/class/net/ibp2s0/mode


In /etc/modules you load
• mlx4_core
• mlx4_ib
• ib_umad
• ib_uverbs
• ib_ipoib