net/mlx5: Add ignore level support fwd to table rules

If user sets ignore flow level flag on a rule, that rule can point to
a flow table of any level, including those with levels equal or less
than the level of the flow table it is added on.

This with unamanged tables will be used to create a FDB chain/prio
hierarchy much larger than currently supported level range.
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c

@@ -432,6 +432,9 @@ static int mlx5_cmd_set_fte(struct mlx5_core_dev *dev,
 	MLX5_SET(set_fte_in, in, table_type, ft->type);
 	MLX5_SET(set_fte_in, in, table_id,   ft->id);
 	MLX5_SET(set_fte_in, in, flow_index, fte->index);
+	MLX5_SET(set_fte_in, in, ignore_flow_level,
+		 !!(fte->action.flags & FLOW_ACT_IGNORE_FLOW_LEVEL));
+
 	if (ft->vport) {
 		MLX5_SET(set_fte_in, in, vport_number, ft->vport);
 		MLX5_SET(set_fte_in, in, other_vport, 1);

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -1536,18 +1536,30 @@ static bool counter_is_valid(u32 action)
 }
 
 static bool dest_is_valid(struct mlx5_flow_destination *dest,
-			  u32 action,
+			  struct mlx5_flow_act *flow_act,
 			  struct mlx5_flow_table *ft)
 {
+	bool ignore_level = flow_act->flags & FLOW_ACT_IGNORE_FLOW_LEVEL;
+	u32 action = flow_act->action;
+
 	if (dest && (dest->type == MLX5_FLOW_DESTINATION_TYPE_COUNTER))
 		return counter_is_valid(action);
 
 	if (!(action & MLX5_FLOW_CONTEXT_ACTION_FWD_DEST))
 		return true;
 
+	if (ignore_level) {
+		if (ft->type != FS_FT_FDB)
+			return false;
+
+		if (dest->type == MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE &&
+		    dest->ft->type != FS_FT_FDB)
+			return false;
+	}
+
 	if (!dest || ((dest->type ==
 	    MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE) &&
-	    (dest->ft->level <= ft->level)))
+	    (dest->ft->level <= ft->level && !ignore_level)))
 		return false;
 	return true;
 }
@@ -1777,7 +1789,7 @@ _mlx5_add_flow_rules(struct mlx5_flow_table *ft,
 		return ERR_PTR(-EINVAL);
 
 	for (i = 0; i < dest_num; i++) {
-		if (!dest_is_valid(&dest[i], flow_act->action, ft))
+		if (!dest_is_valid(&dest[i], flow_act, ft))
 			return ERR_PTR(-EINVAL);
 	}
 	nested_down_read_ref_node(&ft->node, FS_LOCK_GRANDPARENT);

include/linux/mlx5/fs.h

@@ -196,6 +196,7 @@ struct mlx5_fs_vlan {
 
 enum {
 	FLOW_ACT_NO_APPEND = BIT(0),
+	FLOW_ACT_IGNORE_FLOW_LEVEL = BIT(1),
 };
 
 struct mlx5_flow_act {