红帽全球峰会4.2. 临时更改默认 RoCE 版本
不支持在客户端和服务器上的 RoCE v1 使用 RoCE v2 协议。如果您的服务器中的硬件只支持 RoCE v1，请为 RoCE v1 配置客户端，来与服务器进行通信。例如，您可以为只支持 RoCE v1 的 Mellanox ConnectX-5 InfiniBand 设备配置使用 mlx5_0 驱动程序的客户端。
注意
此处描述的更改将保持有效，直到您重启主机。
先决条件
- 客户端使用带有 RoCE v2 协议的 InfiniBand 设备。
- 服务器使用只支持 RoCE v1 的 InfiniBand 设备。
流程
创建
/sys/kernel/config/rdma_cm/mlx5_0/目录：mkdir /sys/kernel/config/rdma_cm/mlx5_0/
# mkdir /sys/kernel/config/rdma_cm/mlx5_0/Copy to Clipboard Copied! Toggle word wrap Toggle overflow 显示默认 RoCE 模式：
cat /sys/kernel/config/rdma_cm/mlx5_0/ports/1/default_roce_mode RoCE v2
# cat /sys/kernel/config/rdma_cm/mlx5_0/ports/1/default_roce_mode RoCE v2Copy to Clipboard Copied! Toggle word wrap Toggle overflow 将默认 RoCE 模式改为版本 1:
echo "IB/RoCE v1" > /sys/kernel/config/rdma_cm/mlx5_0/ports/1/default_roce_mode
# echo "IB/RoCE v1" > /sys/kernel/config/rdma_cm/mlx5_0/ports/1/default_roce_modeCopy to Clipboard Copied! Toggle word wrap Toggle overflow
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