net/mlx5: support IPv6 routing extension push/remove

Reserve the push data buffer for each job and the maximum
length is set to 128 for now.

Only supports type IPPROTO_ROUTING when translating the rte
flow action.

Remove actions must be shared globally and only supports next layer
as TCP or UDP.

Signed-off-by: Rongwei Liu <[email protected]>
Acked-by: Ori Kam <[email protected]>

doc/guides/nics/features/mlx5.ini

@@ -108,6 +108,8 @@ flag                 = Y
 inc_tcp_ack          = Y
 inc_tcp_seq          = Y
 indirect_list        = Y
+ipv6_ext_push        = Y
+ipv6_ext_remove      = Y
 jump                 = Y
 mark                 = Y
 meter                = Y

doc/guides/nics/mlx5.rst

@@ -150,6 +150,7 @@ Features
 - Matching on ESP header SPI field.
 - Matching on InfiniBand BTH.
 - Modify IPv4/IPv6 ECN field.
+- Push or remove IPv6 routing extension.
 - RSS support in sample action.
 - E-Switch mirroring and jump.
 - E-Switch mirroring and modify.
@@ -605,6 +606,15 @@ Limitations
 
   Only supports HW steering (``dv_flow_en=2``).
 
+- IPv6 routing extension push/remove:
+
+  - Supported only with HW Steering enabled (``dv_flow_en=2``).
+  - Supported in non-zero group
+    (no limits on transfer domain if ``fdb_def_rule_en=1`` which is default).
+  - Only supports TCP or UDP as next layer.
+  - IPv6 routing header must be the only present extension.
+  - Not supported on guest port.
+
 - Hairpin:
 
   - Hairpin between two ports could only manual binding and explicit Tx flow mode. For single port hairpin, all the combinations of auto/manual binding and explicit/implicit Tx flow mode could be supported.

doc/guides/rel_notes/release_23_11.rst

@@ -181,6 +181,8 @@ New Features
   * Added support for multi-port E-Switch.
   * Added support for Network Service Header (NSH) flow matching.
   * Added support for ``RTE_FLOW_ITEM_TYPE_PTYPE`` flow item.
+  * Added support for ``RTE_FLOW_ACTION_TYPE_IPV6_EXT_PUSH`` flow action.
+  * Added support for ``RTE_FLOW_ACTION_TYPE_IPV6_EXT_REMOVE`` flow action.
   * Added support for ``RTE_FLOW_ACTION_TYPE_PORT_REPRESENTOR`` flow action and mirror.
   * Added support for ``RTE_FLOW_ACTION_TYPE_INDIRECT_LIST`` flow action.
 

drivers/net/mlx5/mlx5.h

@@ -393,6 +393,7 @@ struct mlx5_hw_q_job {
 	};
 	void *user_data; /* Job user data. */
 	uint8_t *encap_data; /* Encap data. */
+	uint8_t *push_data; /* IPv6 routing push data. */
 	struct mlx5_modification_cmd *mhdr_cmd;
 	struct rte_flow_item *items;
 	union {

drivers/net/mlx5/mlx5_flow.h

@@ -363,6 +363,8 @@ enum mlx5_feature_name {
 #define MLX5_FLOW_ACTION_INDIRECT_AGE (1ull << 44)
 #define MLX5_FLOW_ACTION_QUOTA (1ull << 46)
 #define MLX5_FLOW_ACTION_PORT_REPRESENTOR (1ull << 47)
+#define MLX5_FLOW_ACTION_IPV6_ROUTING_REMOVE (1ull << 48)
+#define MLX5_FLOW_ACTION_IPV6_ROUTING_PUSH (1ull << 49)
 
 #define MLX5_FLOW_DROP_INCLUSIVE_ACTIONS \
 	(MLX5_FLOW_ACTION_COUNT | MLX5_FLOW_ACTION_SAMPLE | MLX5_FLOW_ACTION_AGE)
@@ -1269,6 +1271,8 @@ typedef int
 			    const struct rte_flow_action *,
 			    struct mlx5dr_rule_action *);
 
+#define MLX5_MHDR_MAX_CMD ((MLX5_MAX_MODIFY_NUM) * 2 + 1)
+
 /* rte flow action translate to DR action struct. */
 struct mlx5_action_construct_data {
 	LIST_ENTRY(mlx5_action_construct_data) next;
@@ -1315,6 +1319,10 @@ struct mlx5_action_construct_data {
 		struct {
 			cnt_id_t id;
 		} shared_counter;
+		struct {
+			/* IPv6 extension push data len. */
+			uint16_t len;
+		} ipv6_ext;
 		struct {
 			uint32_t id;
 			uint32_t conf_masked:1;
@@ -1359,6 +1367,7 @@ struct rte_flow_actions_template {
 	uint16_t *src_off; /* RTE action displacement from app. template */
 	uint16_t reformat_off; /* Offset of DR reformat action. */
 	uint16_t mhdr_off; /* Offset of DR modify header action. */
+	uint16_t recom_off;  /* Offset of DR IPv6 routing push remove action. */
 	uint32_t refcnt; /* Reference counter. */
 	uint8_t flex_item; /* flex item index. */
 };
@@ -1384,7 +1393,14 @@ struct mlx5_hw_encap_decap_action {
 	uint8_t data[]; /* Action data. */
 };
 
-#define MLX5_MHDR_MAX_CMD ((MLX5_MAX_MODIFY_NUM) * 2 + 1)
+/* Push remove action struct. */
+struct mlx5_hw_push_remove_action {
+	struct mlx5dr_action *action; /* Action object. */
+	/* Is push_remove action shared across flows in table. */
+	uint8_t shared;
+	size_t data_size; /* Action metadata size. */
+	uint8_t data[]; /* Action data. */
+};
 
 /* Modify field action struct. */
 struct mlx5_hw_modify_header_action {
@@ -1415,6 +1431,9 @@ struct mlx5_hw_actions {
 	/* Encap/Decap action. */
 	struct mlx5_hw_encap_decap_action *encap_decap;
 	uint16_t encap_decap_pos; /* Encap/Decap action position. */
+	/* Push/remove action. */
+	struct mlx5_hw_push_remove_action *push_remove;
+	uint16_t push_remove_pos; /* Push/remove action position. */
 	uint32_t mark:1; /* Indicate the mark action. */
 	cnt_id_t cnt_id; /* Counter id. */
 	uint32_t mtr_id; /* Meter id. */