net/mlx5: HWS, added rules handling

Steering rule is a concept that includes match parameters for a flow,
and actions to perform on the flows that match these parameters.
This patch adds rules handling part of HW Steering.
Reviewed-by: Itamar Gozlan <igozlan@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/mlx5hws_rule.h

+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2024 NVIDIA Corporation & Affiliates */
+
+#ifndef MLX5HWS_RULE_H_
+#define MLX5HWS_RULE_H_
+
+enum {
+	MLX5HWS_STE_CTRL_SZ = 20,
+	MLX5HWS_ACTIONS_SZ = 12,
+	MLX5HWS_MATCH_TAG_SZ = 32,
+	MLX5HWS_JUMBO_TAG_SZ = 44,
+};
+
+enum mlx5hws_rule_status {
+	MLX5HWS_RULE_STATUS_UNKNOWN,
+	MLX5HWS_RULE_STATUS_CREATING,
+	MLX5HWS_RULE_STATUS_CREATED,
+	MLX5HWS_RULE_STATUS_DELETING,
+	MLX5HWS_RULE_STATUS_DELETED,
+	MLX5HWS_RULE_STATUS_FAILING,
+	MLX5HWS_RULE_STATUS_FAILED,
+};
+
+enum mlx5hws_rule_move_state {
+	MLX5HWS_RULE_RESIZE_STATE_IDLE,
+	MLX5HWS_RULE_RESIZE_STATE_WRITING,
+	MLX5HWS_RULE_RESIZE_STATE_DELETING,
+};
+
+enum mlx5hws_rule_jumbo_match_tag_offset {
+	MLX5HWS_RULE_JUMBO_MATCH_TAG_OFFSET_DW0 = 8,
+};
+
+struct mlx5hws_rule_match_tag {
+	union {
+		u8 jumbo[MLX5HWS_JUMBO_TAG_SZ];
+		struct {
+			u8 reserved[MLX5HWS_ACTIONS_SZ];
+			u8 match[MLX5HWS_MATCH_TAG_SZ];
+		};
+	};
+};
+
+struct mlx5hws_rule_resize_info {
+	struct mlx5hws_pool *action_ste_pool[2];
+	u32 rtc_0;
+	u32 rtc_1;
+	u32 rule_idx;
+	u8 state;
+	u8 max_stes;
+	u8 ctrl_seg[MLX5HWS_WQE_SZ_GTA_CTRL]; /* Ctrl segment of STE: 48 bytes */
+	u8 data_seg[MLX5HWS_WQE_SZ_GTA_DATA]; /* Data segment of STE: 64 bytes */
+};
+
+struct mlx5hws_rule {
+	struct mlx5hws_matcher *matcher;
+	union {
+		struct mlx5hws_rule_match_tag tag;
+		struct mlx5hws_rule_resize_info *resize_info;
+	};
+	u32 rtc_0; /* The RTC into which the STE was inserted */
+	u32 rtc_1; /* The RTC into which the STE was inserted */
+	int action_ste_idx; /* STE array index */
+	u8 status; /* enum mlx5hws_rule_status */
+	u8 action_ste_selector; /* For rule update - which action STE is in use */
+	u8 pending_wqes;
+	bool skip_delete; /* For complex rules - another rule with same tag
+			   * still exists, so don't actually delete this rule.
+			   */
+};
+
+void mlx5hws_rule_free_action_ste(struct mlx5hws_rule *rule);
+
+int mlx5hws_rule_move_hws_remove(struct mlx5hws_rule *rule,
+				 void *queue, void *user_data);
+
+int mlx5hws_rule_move_hws_add(struct mlx5hws_rule *rule,
+			      struct mlx5hws_rule_attr *attr);
+
+bool mlx5hws_rule_move_in_progress(struct mlx5hws_rule *rule);
+
+void mlx5hws_rule_clear_resize_info(struct mlx5hws_rule *rule);
+
+#endif /* MLX5HWS_RULE_H_ */