[PATCH] net/mlx5: fix IPv6 DSCP offset in NT HWS API

[Gavin Li]

The RTE action process in the HWS non-template API differs from the
process in SWS. The bit shift handling for IPv6 DSCP was not handled in
HWS, resulting in incorrect data in the field.

To resolve this, bit shift handling should be added to HWS.

Fixes: ec1e7a5ceb69 ("net/mlx5: update IPv6 traffic class modification")
Cc: stable at dpdk.org
Signed-off-by: Gavin Li <gavinl at nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.h    | 5 +++++
 drivers/net/mlx5/mlx5_flow_dv.c | 6 ------
 drivers/net/mlx5/mlx5_flow_hw.c | 5 +++++
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index ff61706054..6ec853f018 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -3680,6 +3680,11 @@ void
 mlx5_indirect_list_handles_release(struct rte_eth_dev *dev);
 
 bool mlx5_flow_is_steering_disabled(void);
+static inline bool
+mlx5_dv_modify_ipv6_traffic_class_supported(struct mlx5_priv *priv)
+{
+	return priv->sh->phdev->config.ipv6_tc_fallback == MLX5_IPV6_TC_OK;
+}
 
 #ifdef HAVE_MLX5_HWS_SUPPORT
 
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index bcce1597e2..517a5e530d 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1638,12 +1638,6 @@ mlx5_modify_flex_item(const struct rte_eth_dev *dev,
 	}
 }
 
-static inline bool
-mlx5_dv_modify_ipv6_traffic_class_supported(struct mlx5_priv *priv)
-{
-	return priv->sh->phdev->config.ipv6_tc_fallback == MLX5_IPV6_TC_OK;
-}
-
 void
 mlx5_flow_field_id_to_modify_info
 		(const struct rte_flow_field_data *data,
diff --git a/drivers/net/mlx5/mlx5_flow_hw.c b/drivers/net/mlx5/mlx5_flow_hw.c
index 9a0aa1827e..628a47f2ce 100644
--- a/drivers/net/mlx5/mlx5_flow_hw.c
+++ b/drivers/net/mlx5/mlx5_flow_hw.c
@@ -1613,6 +1613,11 @@ flow_hw_modify_field_compile(struct rte_eth_dev *dev,
 			value = *(const uint8_t *)item.spec << 24;
 			value = rte_cpu_to_be_32(value);
 			item.spec = &value;
+		} else if (conf->dst.field == RTE_FLOW_FIELD_IPV6_DSCP &&
+			   !(mask[0] & MLX5_IPV6_HDR_ECN_MASK) &&
+			   mlx5_dv_modify_ipv6_traffic_class_supported(dev->data->dev_private)) {
+			value = *(const unaligned_uint32_t *)item.spec << MLX5_IPV6_HDR_DSCP_SHIFT;
+			item.spec = &value;
 		}
 	} else {
 		type = conf->operation == RTE_FLOW_MODIFY_SET ?
-- 
2.34.1