net/mlx5: support modify IPv6 flow label field

Add HW steering support for IPv6 flow label field modification.
Copy from inner IPv6 flow label field is also supported using "level=2".

Signed-off-by: Michael Baum <[email protected]>
Acked-by: Dariusz Sosnowski <[email protected]>

Author: michaelbaum1

doc/guides/rel_notes/release_24_03.rst

@@ -128,6 +128,7 @@ New Features
   * Added support for modifying IPv4 proto field in HWS flow engine.
   * Added support for modifying IPsec ESP fields in HWS flow engine.
   * Added support for modifying IPv6 traffic class field in HWS flow engine.
+  * Added support for modifying IPv6 flow label field in HWS flow engine.
   * Added support for matching a random value.
   * Added support for comparing result between packet fields or value.
   * Added support for accumulating value of field into another one.

drivers/net/mlx5/mlx5_flow_dv.c

@@ -1394,6 +1394,8 @@ mlx5_flow_item_field_width(struct rte_eth_dev *dev,
 		return 32;
 	case RTE_FLOW_FIELD_IPV6_DSCP:
 		return 6;
+	case RTE_FLOW_FIELD_IPV6_FLOW_LABEL:
+		return 20;
 	case RTE_FLOW_FIELD_IPV6_TRAFFIC_CLASS:
 	case RTE_FLOW_FIELD_IPV6_HOPLIMIT:
 	case RTE_FLOW_FIELD_IPV6_PROTO:
@@ -1806,6 +1808,16 @@ mlx5_flow_field_id_to_modify_info
 		else
 			info[idx].offset = off_be;
 		break;
+	case RTE_FLOW_FIELD_IPV6_FLOW_LABEL:
+		MLX5_ASSERT(data->offset + width <= 20);
+		off_be = 20 - (data->offset + width);
+		modi_id = CALC_MODI_ID(IPV6_FLOW_LABEL, data->level);
+		info[idx] = (struct field_modify_info){4, 0, modi_id};
+		if (mask)
+			mask[idx] = flow_modify_info_mask_32(width, off_be);
+		else
+			info[idx].offset = off_be;
+		break;
 	case RTE_FLOW_FIELD_IPV6_PAYLOAD_LEN:
 		MLX5_ASSERT(data->offset + width <= 16);
 		off_be = 16 - (data->offset + width);

drivers/net/mlx5/mlx5_flow_hw.c

@@ -5068,6 +5068,7 @@ flow_hw_validate_modify_field_level(const struct rte_flow_field_data *data,
 	case RTE_FLOW_FIELD_IPV4_SRC:
 	case RTE_FLOW_FIELD_IPV4_DST:
 	case RTE_FLOW_FIELD_IPV6_TRAFFIC_CLASS:
+	case RTE_FLOW_FIELD_IPV6_FLOW_LABEL:
 	case RTE_FLOW_FIELD_IPV6_PAYLOAD_LEN:
 	case RTE_FLOW_FIELD_IPV6_HOPLIMIT:
 	case RTE_FLOW_FIELD_IPV6_SRC: