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  1. Create a directory for the mlx4/mlx5.

    mkdir -p /sys/kernel/config/rdma_cm/mlx4_0/
  2. Validate what is the used RoCE mode in the default_roce_mode configfs.

    # cat /sys/kernel/config/rdma_cm/mlx4_0/ports/1/default_roce_mode IB/RoCE v1
  3. Change the default RoCE mode,
  • For RoCE v1: IB/RoCE v1

    # echo "IB/RoCE v1" >
    /sys/kernel/config/rdma_cm/mlx4_0/ports/1/default_roce_mode
    # cat /sys/kernel/config/rdma_cm/mlx4_0/ports/1/default_roce_mode IB/RoCE v1
  • For RoCE v2: RoCE v2

    # echo "RoCE v2" >
    /sys/kernel/config/rdma_cm/mlx4_0/ports/1/default_roce_mode
    # cat /sys/kernel/config/rdma_cm/mlx4_0/ports/1/default_roce_mode
    RoCE v2