Prerequisites:

Do read Basic Understanding RoCE and Infiniband

Step 1: Install Mellanox Package

First and Foremost, you have to install Mellanox Package which you can download at https://developer.nvidia.com/networking/ethernet-software. You may want to consider installing using the traditional method or Ansible Method (Installing Mellanox OFED (mlnx_ofed) packages using Ansible)

Step 2: Load the Drivers

Activate two kernel modules that are needed for rdma and RoCE exchanges by using the command

# modprobe rdma_cm ib_umad

Step 3: Verify the drivers are loaded

# ibv_devinfo

Step 4: Set the RoCE to version 2

Set the version of the RoCE protocol to v2 by issuing the command below.

• -d is the device, 
• -p is the port 
• -m the version of RoCE:

[root@node1]# cma_roce_mode -d mlx5_0 -p 1 -m 2
RoCE v2

Step 5: Check which RoCE devices are enabled on the Ethernet

[root@node-1]# ibdev2netdev
mlx5_0 port 1 ==> ens1f0 (Up)
mlx5_1 port 1 ==> ens1f1 (Down)

Refererences:

1. Setting up a RoCE cluster