I am having the same issues, the card recognised but mlx4_core is showing Kernel driver in use. any ideas how I can resolve this?
The card is not showing in the networks tab.
Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)
Subsystem: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s]
Kernel driver in use: mlx4_core
Kernel modules: mlx4_core