Default RoCE Mode Setting

1. Mount the configfs file.

   # mount -t configfs none /sys/kernel/config
   

   
   

2. Create a directory for the mlx4/mlx5.

   mkdir -p /sys/kernel/config/rdma_cm/mlx4_0/
   

   
   

3. 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
   

   
   

4. 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
  

  
  

Last updated: January 10, 2024