[dpdk-dev] [PATCH v4 15/17] net/mlx5: validation of CT item

[Bing Zhao <bingz@nvidia.com>]

The item of ASO connection tracking will be translated into the
register value when matching. The validation of this item has no
dependency on other layers, since the flow including this item
should be jumped from another group. All the layers checking was
already done in the previous groups. Only the state bits conflict
should be checked.

It is assumed that the flow with CT item will always work on the
TCP traffic.

Signed-off-by: Bing Zhao <bingz@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.h    |  3 ++
 drivers/net/mlx5/mlx5_flow_dv.c | 51 +++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index eb0bb42161..238befa2d4 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -147,6 +147,9 @@ enum mlx5_feature_name {
 #define MLX5_FLOW_LAYER_GENEVE_OPT (UINT64_C(1) << 32)
 #define MLX5_FLOW_LAYER_GTP_PSC (UINT64_C(1) << 33)
 
+/* Conntrack item. */
+#define MLX5_FLOW_LAYER_ASO_CT (UINT64_C(1) << 34)
+
 /* Outer Masks. */
 #define MLX5_FLOW_LAYER_OUTER_L3 \
 	(MLX5_FLOW_LAYER_OUTER_L3_IPV4 | MLX5_FLOW_LAYER_OUTER_L3_IPV6)
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index f2a2c609e2..aa0a5acdca 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -2598,6 +2598,51 @@ flow_dv_validate_item_ipv6_frag_ext(const struct rte_flow_item *item,
 				  "specified range not supported");
 }
 
+/*
+ * Validate ASO CT item.
+ *
+ * @param[in] dev
+ *   Pointer to the rte_eth_dev structure.
+ * @param[in] item
+ *   Item specification.
+ * @param[in] item_flags
+ *   Pointer to bit-fields that holds the items detected until now.
+ * @param[out] error
+ *   Pointer to error structure.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+flow_dv_validate_item_aso_ct(struct rte_eth_dev *dev,
+			     const struct rte_flow_item *item,
+			     uint64_t *item_flags,
+			     struct rte_flow_error *error)
+{
+	const struct rte_flow_item_conntrack *spec = item->spec;
+	const struct rte_flow_item_conntrack *mask = item->mask;
+	RTE_SET_USED(dev);
+	uint32_t flags;
+
+	if (*item_flags & MLX5_FLOW_LAYER_ASO_CT)
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, NULL,
+					  "Only one CT is supported");
+	if (!mask)
+		mask = &rte_flow_item_conntrack_mask;
+	flags = spec->flags & mask->flags;
+	if ((flags & RTE_FLOW_CONNTRACK_PKT_STATE_VALID) &&
+	    ((flags & RTE_FLOW_CONNTRACK_PKT_STATE_INVALID) ||
+	     (flags & RTE_FLOW_CONNTRACK_PKT_STATE_BAD) ||
+	     (flags & RTE_FLOW_CONNTRACK_PKT_STATE_DISABLED)))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, NULL,
+					  "Conflict status bits");
+	/* State change also needs to be considered. */
+	*item_flags |= MLX5_FLOW_LAYER_ASO_CT;
+	return 0;
+}
+
 /**
  * Validate the pop VLAN action.
  *
@@ -6696,6 +6741,12 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
 				return ret;
 			last_item = MLX5_FLOW_LAYER_ECPRI;
 			break;
+		case RTE_FLOW_ITEM_TYPE_CONNTRACK:
+			ret = flow_dv_validate_item_aso_ct(dev, items,
+							   &item_flags, error);
+			if (ret < 0)
+				return ret;
+			break;
 		default:
 			return rte_flow_error_set(error, ENOTSUP,
 						  RTE_FLOW_ERROR_TYPE_ITEM,
-- 
2.27.0