net/mlx5_core: Introduce flow steering API

Introducing the following objects:

mlx5_flow_root_namespace: represent the root of specific flow table
type tree(e.g NIC receive, FDB, etc..)

mlx5_flow_group: define the mask of the flow specification.

fs_fte(flow steering flow table entry): defines the value of the
flow specification.

The following describes the relationships between the tree objects:
root_namespace --> priorities -->namespaces -->
priorities -->flow-tables --> flow-groups -->
flow-entries --> destinations

When we create new object(flow table/flow group/flow table entry), we
call to the FW command and then we add the related sw object to the tree.

When we destroy object, e.g. call to mlx5_destroy_flow_table, we use
the tree node destructor for destroying the FW object and remove the
node from the tree.
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -69,13 +69,16 @@ struct mlx5_flow_rule {
 	struct mlx5_flow_destination		dest_attr;
 };
 
+/* Type of children is mlx5_flow_group */
 struct mlx5_flow_table {
 	struct fs_node			node;
 	u32				id;
+	unsigned int			max_fte;
 	unsigned int			level;
 	enum fs_flow_table_type		type;
 };
 
+/* Type of children is mlx5_flow_rule */
 struct fs_fte {
 	struct fs_node			node;
 	u32				val[MLX5_ST_SZ_DW(fte_match_param)];
@@ -83,15 +86,19 @@ struct fs_fte {
 	u32				flow_tag;
 	u32				index;
 	u32				action;
+	enum fs_fte_status		status;
 };
 
+/* Type of children is mlx5_flow_table/namespace */
 struct fs_prio {
 	struct fs_node			node;
 	unsigned int			max_ft;
 	unsigned int			start_level;
 	unsigned int			prio;
+	unsigned int			num_ft;
 };
 
+/* Type of children is fs_prio */
 struct mlx5_flow_namespace {
 	/* parent == NULL => root ns */
 	struct	fs_node			node;
@@ -102,6 +109,22 @@ struct mlx5_flow_group_mask {
 	u32	match_criteria[MLX5_ST_SZ_DW(fte_match_param)];
 };
 
+/* Type of children is fs_fte */
+struct mlx5_flow_group {
+	struct fs_node			node;
+	struct mlx5_flow_group_mask	mask;
+	u32				start_index;
+	u32				max_ftes;
+	u32				num_ftes;
+	u32				id;
+};
+
+struct mlx5_flow_root_namespace {
+	struct mlx5_flow_namespace	ns;
+	enum   fs_flow_table_type	table_type;
+	struct mlx5_core_dev		*dev;
+};
+
 #define fs_get_obj(v, _node)  {v = container_of((_node), typeof(*v), node); }
 
 #define fs_list_for_each_entry(pos, root)		\