Mellanox ConnectX-4 100GbE with FreeNAS 11.1 U4

I installed a ConnectX-4 card in a x16 slot, but no new interfaces are showing up. I do see in the logs that there is a mlx5_core driver that does recognize which port has a module:

mlx5_core0: <mlx5_core> mem 0xf8000000-0xf9ffffff irq 64 at device 0.0 numa-domain 1 on pci13
mlx5_core0: INFO: firmware version: 12.17.2032
mlx5_core0: INFO: Module 0, status: plugged
mlx5_core1: <mlx5_core> mem 0xf6000000-0xf7ffffff irq 68 at device 0.1 numa-domain 1 on pci13
mlx5_core1: INFO: firmware...

Mellanox ConnectX-4 100GbE with FreeNAS 11.1 U4