[dpdk-dev] [PATCH v2] net/mlx5: fix NVGRE matching

[Dekel Peled <dekelp@mellanox.com>]

NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
value 0x6558.
These should be matched when item_nvgre is provided.

This patch adds validation function of NVGRE item.
It also updates the translate function of NVGRE item, to add the
required values, if they were not specified.

Original work by Xiaoyu Min <jackmin@mellanox.com>

Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
Cc: stable@dpdk.org

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c    | 63 +++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_flow.h    | 10 +++++--
 drivers/net/mlx5/mlx5_flow_dv.c | 25 ++++++++++++++--
 drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
 4 files changed, 95 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index e082cbb..3d2d5fc 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -298,6 +298,10 @@ struct mlx5_flow_tunnel_info {
 		.tunnel = MLX5_FLOW_LAYER_MPLS,
 		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
 	},
+	{
+		.tunnel = MLX5_FLOW_LAYER_NVGRE,
+		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
+	},
 };
 
 /**
@@ -1323,6 +1327,11 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "L3 cannot follow an L4 layer.");
+	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
+		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 cannot follow an NVGRE layer.");
 	if (!mask)
 		mask = &rte_flow_item_ipv4_mask;
 	else if (mask->hdr.next_proto_id != 0 &&
@@ -1409,6 +1418,11 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "L3 cannot follow an L4 layer.");
+	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
+		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 cannot follow an NVGRE layer.");
 	if (!mask)
 		mask = &rte_flow_item_ipv6_mask;
 	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask,
@@ -1887,6 +1901,55 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 				  " update.");
 }
 
+/**
+ * Validate NVGRE item.
+ *
+ * @param[in] item
+ *   Item specification.
+ * @param[in] item_flags
+ *   Bit flags to mark detected items.
+ * @param[in] target_protocol
+ *   The next protocol in the previous item.
+ * @param[out] error
+ *   Pointer to error structure.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
+			      uint64_t item_flags,
+			      uint8_t target_protocol,
+			      struct rte_flow_error *error)
+{
+	const struct rte_flow_item_nvgre *mask = item->mask;
+	int ret;
+
+	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "protocol filtering not compatible"
+					  " with this GRE layer");
+	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "multiple tunnel layers not"
+					  " supported");
+	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 Layer is missing");
+	if (!mask)
+		mask = &rte_flow_item_nvgre_mask;
+	ret = mlx5_flow_item_acceptable
+		(item, (const uint8_t *)mask,
+		 (const uint8_t *)&rte_flow_item_nvgre_mask,
+		 sizeof(struct rte_flow_item_nvgre), error);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
 static int
 flow_null_validate(struct rte_eth_dev *dev __rte_unused,
 		   const struct rte_flow_attr *attr __rte_unused,
diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 3f96bec..24da74b 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -48,6 +48,7 @@
 #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)
 #define MLX5_FLOW_LAYER_GRE (1u << 14)
 #define MLX5_FLOW_LAYER_MPLS (1u << 15)
+/* List of tunnel Layer bits continued below. */
 
 /* General pattern items bits. */
 #define MLX5_FLOW_ITEM_METADATA (1u << 16)
@@ -58,8 +59,10 @@
 #define MLX5_FLOW_LAYER_ICMP6 (1u << 19)
 #define MLX5_FLOW_LAYER_GRE_KEY (1u << 20)
 
+/* Pattern tunnel Layer bits (continued). */
 #define MLX5_FLOW_LAYER_IPIP (1u << 21)
 #define MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
+#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
 
 /* Outer Masks. */
 #define MLX5_FLOW_LAYER_OUTER_L3 \
@@ -79,7 +82,7 @@
 /* Tunnel Masks. */
 #define MLX5_FLOW_LAYER_TUNNEL \
 	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
-	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
+	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE | MLX5_FLOW_LAYER_MPLS | \
 	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
 
 /* Inner Masks. */
@@ -518,5 +521,8 @@ int mlx5_flow_validate_item_icmp6(const struct rte_flow_item *item,
 				   uint64_t item_flags,
 				   uint8_t target_protocol,
 				   struct rte_flow_error *error);
-
+int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
+				  uint64_t item_flags,
+				  uint8_t target_protocol,
+				  struct rte_flow_error *error);
 #endif /* RTE_PMD_MLX5_FLOW_H_ */
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 7240d3b..f1d32bd 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -2966,7 +2966,6 @@ struct field_modify_info modify_tcp[] = {
 					     MLX5_FLOW_LAYER_OUTER_L4_UDP;
 			break;
 		case RTE_FLOW_ITEM_TYPE_GRE:
-		case RTE_FLOW_ITEM_TYPE_NVGRE:
 			ret = mlx5_flow_validate_item_gre(items, item_flags,
 							  next_protocol, error);
 			if (ret < 0)
@@ -2974,6 +2973,14 @@ struct field_modify_info modify_tcp[] = {
 			gre_item = items;
 			last_item = MLX5_FLOW_LAYER_GRE;
 			break;
+		case RTE_FLOW_ITEM_TYPE_NVGRE:
+			ret = mlx5_flow_validate_item_nvgre(items, item_flags,
+							    next_protocol,
+							    error);
+			if (ret < 0)
+				return ret;
+			last_item = MLX5_FLOW_LAYER_NVGRE;
+			break;
 		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
 			ret = mlx5_flow_validate_item_gre_key
 				(items, item_flags, gre_item, error);
@@ -3919,7 +3926,21 @@ struct field_modify_info modify_tcp[] = {
 	int size;
 	int i;
 
-	flow_dv_translate_item_gre(matcher, key, item, inner);
+	/* For NVGRE, GRE header fields must be set with defined values. */
+	const struct rte_flow_item_gre gre_spec = {
+		.c_rsvd0_ver = RTE_BE16(0x2000),
+		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
+	};
+	const struct rte_flow_item_gre gre_mask = {
+		.c_rsvd0_ver = RTE_BE16(0xB000),
+		.protocol = RTE_BE16(UINT16_MAX),
+	};
+	const struct rte_flow_item gre_item = {
+		.spec = &gre_spec,
+		.mask = &gre_mask,
+		.last = NULL,
+	};
+	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
 	if (!nvgre_v)
 		return;
 	if (!nvgre_m)
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 4252832..928d6c3 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -40,7 +40,7 @@
 #include "mlx5_glue.h"
 
 /* Support tunnel matching. */
-#define MLX5_FLOW_TUNNEL 5
+#define MLX5_FLOW_TUNNEL 6
 
 struct mlx5_rxq_stats {
 #ifdef MLX5_PMD_SOFT_COUNTERS
-- 
1.8.3.1