[PATCH 3/4] net/mlx5: add hash result metadata to modify field

[Alexander Kozyrev <akozyrev@nvidia.com>]

Allow copy of the hash result via modify_field Flow API.
Setting this value is not allowed, it is read-only field.

Signed-off-by: Alexander Kozyrev <akozyrev@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 12 ++++++++++++
 drivers/net/mlx5/mlx5_flow_hw.c |  5 +++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 7ca909999b..84fc725738 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1390,6 +1390,8 @@ mlx5_flow_item_field_width(struct rte_eth_dev *dev,
 	case RTE_FLOW_FIELD_IPV6_ECN:
 	case RTE_FLOW_FIELD_METER_COLOR:
 		return 2;
+	case RTE_FLOW_FIELD_HASH_RESULT:
+		return 32;
 	default:
 		MLX5_ASSERT(false);
 	}
@@ -1883,6 +1885,16 @@ mlx5_flow_field_id_to_modify_info
 				info[idx].offset = data->offset;
 		}
 		break;
+	case RTE_FLOW_FIELD_HASH_RESULT:
+		MLX5_ASSERT(data->offset + width <= 32);
+		off_be = 32 - (data->offset + width);
+		info[idx] = (struct field_modify_info){4, 0,
+						       MLX5_MODI_HASH_RESULT};
+		if (mask)
+			mask[idx] = flow_modify_info_mask_32(width, off_be);
+		else
+			info[idx].offset = off_be;
+		break;
 	case RTE_FLOW_FIELD_POINTER:
 	case RTE_FLOW_FIELD_VALUE:
 	default:
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index b209b448c6..6f391d990d 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -3530,10 +3530,11 @@ flow_hw_validate_action_modify_field(const struct rte_flow_action *action,
 				RTE_FLOW_ERROR_TYPE_ACTION, action,
 				"destination field mask and template are not equal");
 	if (action_conf->dst.field == RTE_FLOW_FIELD_POINTER ||
-	    action_conf->dst.field == RTE_FLOW_FIELD_VALUE)
+	    action_conf->dst.field == RTE_FLOW_FIELD_VALUE ||
+	    action_conf->dst.field == RTE_FLOW_FIELD_HASH_RESULT)
 		return rte_flow_error_set(error, EINVAL,
 				RTE_FLOW_ERROR_TYPE_ACTION, action,
-				"immediate value and pointer cannot be used as destination");
+				"immediate value, pointer and hash result cannot be used as destination");
 	if (mask_conf->dst.level != UINT32_MAX)
 		return rte_flow_error_set(error, EINVAL,
 			RTE_FLOW_ERROR_TYPE_ACTION, action,
-- 
2.18.2