net/mlx5: Add hash table to search FTEs in a flow-group

When adding a flow table entry (fte) to a flow group (fg), we first
need to check whether this fte exist. In such a case we just merge
the destinations (if possible). Currently, this is done by traversing
the fte list available in a fg. This could take a lot of time when
using large flow groups. Speeding this up by using rhashtable, which
is much faster.
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -34,6 +34,7 @@
 #define _MLX5_FS_CORE_
 
 #include <linux/mlx5/fs.h>
+#include <linux/rhashtable.h>
 
 enum fs_node_type {
 	FS_TYPE_NAMESPACE,
@@ -168,6 +169,7 @@ struct fs_fte {
 	u32				modify_id;
 	enum fs_fte_status		status;
 	struct mlx5_fc			*counter;
+	struct rhash_head		hash;
 };
 
 /* Type of children is mlx5_flow_table/namespace */
@@ -197,6 +199,7 @@ struct mlx5_flow_group {
 	u32				start_index;
 	u32				max_ftes;
 	u32				id;
+	struct rhashtable		ftes_hash;
 };
 
 struct mlx5_flow_root_namespace {