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

@@ -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");