[dpdk-dev] [PATCH v2 4/6] net/mlx5: add GTP PSC flow validation

[Shiri Kuzin <shirik@nvidia.com>]

In this patch we add validation routine for
GTP PSC extension header.

The GTP PSC extension header must follow the
GTP item.

Signed-off-by: Shiri Kuzin <shirik@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.h    |  8 ++++
 drivers/net/mlx5/mlx5_flow_dv.c | 76 +++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index ee85c9d8a5..e54412e07b 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -138,6 +138,9 @@ enum mlx5_feature_name {
 #define MLX5_FLOW_LAYER_OUTER_L3_IPV6_FRAG_EXT (1u << 30)
 #define MLX5_FLOW_LAYER_INNER_L3_IPV6_FRAG_EXT (1u << 31)
 
+/* Pattern tunnel Layer bits (continued). */
+#define MLX5_FLOW_LAYER_GTP_PSC (UINT64_C(1) << 33)
+
 /* Outer Masks. */
 #define MLX5_FLOW_LAYER_OUTER_L3 \
 	(MLX5_FLOW_LAYER_OUTER_L3_IPV4 | MLX5_FLOW_LAYER_OUTER_L3_IPV6)
@@ -348,6 +351,11 @@ enum mlx5_feature_name {
 
 #define MLX5_ENCAPSULATION_DECISION_SIZE (sizeof(struct rte_ether_hdr) + \
 					  sizeof(struct rte_ipv4_hdr))
+/* GTP extension header flag. */
+#define MLX5_GTP_EXT_HEADER_FLAG 4
+
+/* GTP extension header max PDU type value. */
+#define MLX5_GTP_EXT_MAX_PDU_TYPE 15
 
 /* IPv4 fragment_offset field contains relevant data in bits 2 to 15. */
 #define MLX5_IPV4_FRAG_OFFSET_MASK \
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index e4736ee9b5..d11f4eb4b8 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1759,6 +1759,72 @@ flow_dv_validate_item_gtp(struct rte_eth_dev *dev,
 					 MLX5_ITEM_RANGE_NOT_ACCEPTED, error);
 }
 
+/**
+ * Validate GTP PSC item.
+ *
+ * @param[in] item
+ *   Item specification.
+ * @param[in] last_item
+ *   Previous validated item in the pattern items.
+ * @param[in] gtp_item
+ *   Previous GTP item specification.
+ * @param[in] attr
+ *   Pointer to flow attributes.
+ * @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_gtp_psc(const struct rte_flow_item *item,
+			      uint64_t last_item,
+			      const struct rte_flow_item *gtp_item,
+			      const struct rte_flow_attr *attr,
+			      struct rte_flow_error *error)
+{
+	const struct rte_flow_item_gtp *gtp_spec;
+	const struct rte_flow_item_gtp *gtp_mask;
+	const struct rte_flow_item_gtp_psc *spec;
+	const struct rte_flow_item_gtp_psc *mask;
+	const struct rte_flow_item_gtp_psc nic_mask = {
+		.pdu_type = 0xFF,
+		.qfi = 0xFF,
+	};
+
+	if (!gtp_item || !(last_item & MLX5_FLOW_LAYER_GTP))
+		return rte_flow_error_set
+			(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, item,
+			 "GTP PSC item must be preceded with GTP item");
+	gtp_spec = gtp_item->spec;
+	gtp_mask = gtp_item->mask ? gtp_item->mask : &rte_flow_item_gtp_mask;
+	/* GTP spec and E flag is requested to match zero. */
+	if (gtp_spec &&
+		(gtp_mask->v_pt_rsv_flags &
+		~gtp_spec->v_pt_rsv_flags & MLX5_GTP_EXT_HEADER_FLAG))
+		return rte_flow_error_set
+			(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, item,
+			 "GTP E flag must be 1 to match GTP PSC");
+	/* Check the flow is not created in group zero. */
+	if (!attr->transfer && !attr->group)
+		return rte_flow_error_set
+			(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
+			 "GTP PSC is not supported for group 0");
+	/* GTP spec is here and E flag is requested to match zero. */
+	if (!item->spec)
+		return 0;
+	spec = item->spec;
+	mask = item->mask ? item->mask : &rte_flow_item_gtp_psc_mask;
+	if (spec->pdu_type > MLX5_GTP_EXT_MAX_PDU_TYPE)
+		return rte_flow_error_set
+			(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM, item,
+			 "PDU type should be smaller than 16");
+	return mlx5_flow_item_acceptable(item, (const uint8_t *)mask,
+					 (const uint8_t *)&nic_mask,
+					 sizeof(struct rte_flow_item_gtp_psc),
+					 MLX5_ITEM_RANGE_NOT_ACCEPTED, error);
+}
+
 /**
  * Validate IPV4 item.
  * Use existing validation function mlx5_flow_validate_item_ipv4(), and
@@ -5238,6 +5304,7 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
 	int actions_n = 0;
 	uint8_t item_ipv6_proto = 0;
 	const struct rte_flow_item *gre_item = NULL;
+	const struct rte_flow_item *gtp_item = NULL;
 	const struct rte_flow_action_raw_decap *decap;
 	const struct rte_flow_action_raw_encap *encap;
 	const struct rte_flow_action_rss *rss;
@@ -5575,8 +5642,17 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
 							error);
 			if (ret < 0)
 				return ret;
+			gtp_item = items;
 			last_item = MLX5_FLOW_LAYER_GTP;
 			break;
+		case RTE_FLOW_ITEM_TYPE_GTP_PSC:
+			ret = flow_dv_validate_item_gtp_psc(items, last_item,
+							    gtp_item, attr,
+							    error);
+			if (ret < 0)
+				return ret;
+			last_item = MLX5_FLOW_LAYER_GTP_PSC;
+			break;
 		case RTE_FLOW_ITEM_TYPE_ECPRI:
 			/* Capacity will be checked in the translate stage. */
 			ret = mlx5_flow_validate_item_ecpri(items, item_flags,
-- 
2.21.0