[PATCH v1 7/7] net/mlx5: support modify IPv6 flow label field

[Michael Baum <michaelba@nvidia.com>]

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 <michaelba@nvidia.com>
---
 doc/guides/rel_notes/release_24_03.rst |  1 +
 drivers/net/mlx5/mlx5_flow_dv.c        | 12 ++++++++++++
 drivers/net/mlx5/mlx5_flow_hw.c        |  1 +
 3 files changed, 14 insertions(+)

diff --git a/doc/guides/rel_notes/release_24_03.rst b/doc/guides/rel_notes/release_24_03.rst
index 272bc9d056..4cb45ba439 100644
--- a/doc/guides/rel_notes/release_24_03.rst
+++ b/doc/guides/rel_notes/release_24_03.rst
@@ -101,6 +101,7 @@ New Features
   * Added HW steering support for modify field ``RTE_FLOW_FIELD_ESP_SEQ_NUM`` flow action.
   * Added HW steering support for modify field ``RTE_FLOW_FIELD_ESP_PROTO`` flow action.
   * Added HW steering support for modify field ``RTE_FLOW_FIELD_IPV6_TRAFFIC_CLASS`` flow action.
+  * Added HW steering support for modify field ``RTE_FLOW_FIELD_IPV6_FLOW_LABEL`` flow action.
 
 
 Removed Items
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 90ef21d75b..418e0c0998 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/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);
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index 90e3cf2555..90a06e7b44 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -5059,6 +5059,7 @@ flow_hw_validate_modify_field_level(const struct rte_flow_action_modify_data *da
 	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:
-- 
2.25.1