Re: [PATCH net-next 4/4] net/mlx5: Add support for setting parent of nodes

[Paolo Abeni <pabeni@redhat.com>]

On 3/10/25 10:26 PM, Tariq Toukan wrote:
> @@ -1018,3 +1018,105 @@ int mlx5_esw_devlink_rate_leaf_parent_set(struct devlink_rate *devlink_rate,
>  	node = parent_priv;
>  	return mlx5_esw_qos_vport_update_parent(vport, node, extack);
>  }
> +
> +static int
> +mlx5_esw_qos_node_validate_set_parent(struct mlx5_esw_sched_node *node,
> +				      struct mlx5_esw_sched_node *parent,
> +				      struct netlink_ext_ack *extack)
> +{
> +	u8 new_level, max_level;
> +
> +	if (parent && parent->esw != node->esw) {
> +		NL_SET_ERR_MSG_MOD(extack,
> +				   "Cannot assign node to another E-Switch");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	if (!list_empty(&node->children)) {
> +		NL_SET_ERR_MSG_MOD(extack,
> +				   "Cannot reassign a node that contains rate objects");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	new_level = parent ? parent->level + 1 : 2;
> +	max_level = 1 << MLX5_CAP_QOS(node->esw->dev, log_esw_max_sched_depth);
> +	if (new_level > max_level) {
> +		NL_SET_ERR_MSG_MOD(extack,
> +				   "Node hierarchy depth exceeds the maximum supported level");

Minor nit for a possible small follow-up: it could be possibly useful to
add to the extact the current and max level.

/P