memcpy(in.gid, mgid, sizeof(*mgid));
in.qpn = cpu_to_be32(qpn);
err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
memcpy(in.gid, mgid, sizeof(*mgid));
in.qpn = cpu_to_be32(qpn);
err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));