ethdev: add L2TPv3 over IP header to flow API

This patch adds the new flow item RTE_FLOW_ITEM_TYPE_L2TPV3OIP to
flow API to match a L2TPv3 over IP header. This patch supports only
L2TPv3 over IP header format which is different to L2TPv2/L2TPv3
over UDP. The difference in header formats between L2TPv3 over IP
and L2TP over UDP require a separate implementation for each.

Signed-off-by: Rory Sexton <rory.sexton@intel.com>
Signed-off-by: Dariusz Jagus <dariuszx.jagus@intel.com>
Acked-by: Ori Kam <orika@mellanox.com>

app/test-pmd/cmdline_flow.c

@@ -213,6 +213,8 @@ enum index {
 	ITEM_TAG,
 	ITEM_TAG_DATA,
 	ITEM_TAG_INDEX,
+	ITEM_L2TPV3OIP,
+	ITEM_L2TPV3OIP_SESSION_ID,
 
 	/* Validate/create actions. */
 	ACTIONS,
@@ -750,6 +752,7 @@ static const enum index next_item[] = {
 	ITEM_PPPOE_PROTO_ID,
 	ITEM_HIGIG2,
 	ITEM_TAG,
+	ITEM_L2TPV3OIP,
 	END_SET,
 	ZERO,
 };
@@ -1034,6 +1037,12 @@ static const enum index item_tag[] = {
 	ZERO,
 };
 
+static const enum index item_l2tpv3oip[] = {
+	ITEM_L2TPV3OIP_SESSION_ID,
+	ITEM_NEXT,
+	ZERO,
+};
+
 static const enum index next_action[] = {
 	ACTION_END,
 	ACTION_VOID,
@@ -2611,6 +2620,22 @@ static const struct token token_list[] = {
 			     NEXT_ENTRY(ITEM_PARAM_IS)),
 		.args = ARGS(ARGS_ENTRY(struct rte_flow_item_tag, index)),
 	},
+	[ITEM_L2TPV3OIP] = {
+		.name = "l2tpv3oip",
+		.help = "match L2TPv3 over IP header",
+		.priv = PRIV_ITEM(L2TPV3OIP,
+				  sizeof(struct rte_flow_item_l2tpv3oip)),
+		.next = NEXT(item_l2tpv3oip),
+		.call = parse_vc,
+	},
+	[ITEM_L2TPV3OIP_SESSION_ID] = {
+		.name = "session_id",
+		.help = "session identifier",
+		.next = NEXT(item_l2tpv3oip, NEXT_ENTRY(UNSIGNED), item_param),
+		.args = ARGS(ARGS_ENTRY_HTON(struct rte_flow_item_l2tpv3oip,
+					     session_id)),
+	},
+
 	/* Validate/create actions. */
 	[ACTIONS] = {
 		.name = "actions",
@@ -6291,6 +6316,10 @@ flow_item_default_mask(const struct rte_flow_item *item)
 		break;
 	case RTE_FLOW_ITEM_TYPE_PPPOE_PROTO_ID:
 		mask = &rte_flow_item_pppoe_proto_id_mask;
+		break;
+	case RTE_FLOW_ITEM_TYPE_L2TPV3OIP:
+		mask = &rte_flow_item_l2tpv3oip_mask;
+		break;
 	default:
 		break;
 	}
@@ -6380,6 +6409,10 @@ cmd_set_raw_parsed(const struct buffer *in)
 		case RTE_FLOW_ITEM_TYPE_GENEVE:
 			size = sizeof(struct rte_flow_item_geneve);
 			break;
+		case RTE_FLOW_ITEM_TYPE_L2TPV3OIP:
+			size = sizeof(struct rte_flow_item_l2tpv3oip);
+			proto = 0x73;
+			break;
 		default:
 			printf("Error - Not supported item\n");
 			*total_size = 0;

doc/guides/prog_guide/rte_flow.rst

@@ -1336,6 +1336,13 @@ Broadcom switches.
 
 - Default ``mask`` matches classification and vlan.
 
+Item: ``L2TPV3OIP``
+^^^^^^^^^^^^^^^^^^^
+
+Matches a L2TPv3 over IP header.
+
+- ``session_id``: L2TPv3 over IP session identifier.
+- Default ``mask`` matches session_id only.
 
 Actions
 ~~~~~~~

doc/guides/rel_notes/release_20_02.rst

@@ -61,6 +61,10 @@ New Features
   A new API has been added to wait for a memory location to be updated with a
   16-bit, 32-bit, 64-bit value.
 
+* **Updated rte_flow api to support L2TPv3 over IP flows.**
+
+  Added support for new flow item to handle L2TPv3 over IP rte_flow patterns.
+
 * **Updated Hisilicon hns3 driver.**
 
   Updated Hisilicon hns3 driver with new features and improvements, including:
@@ -73,6 +77,11 @@ New Features
 
   * Added support for RSS using L3/L4 source/destination only.
 
+* **Updated testpmd to support L2TPv3 over IP flows.**
+
+  Added support for L2TPv3 over IP rte_flow patterns to the testpmd
+  application.
+
 * **Added algorithms to cryptodev API.**
 
   * Chacha20-Poly1305 AEAD algorithm can now be supported in cryptodev.

doc/guides/testpmd_app_ug/testpmd_funcs.rst

@@ -3969,6 +3969,10 @@ This section lists supported pattern items and their attributes, if any.
 
   - ``proto_id {unsigned}``: PPP protocol identifier.
 
+- ``l2tpv3oip``: match L2TPv3 over IP header.
+
+  - ``session_id {unsigned}``: L2TPv3 over IP session identifier.
+
 Actions list
 ^^^^^^^^^^^^
 

lib/librte_ethdev/rte_flow.c

@@ -93,6 +93,7 @@ static const struct rte_flow_desc_data rte_flow_desc_item[] = {
 	MK_FLOW_ITEM(IGMP, sizeof(struct rte_flow_item_igmp)),
 	MK_FLOW_ITEM(AH, sizeof(struct rte_flow_item_ah)),
 	MK_FLOW_ITEM(HIGIG2, sizeof(struct rte_flow_item_higig2_hdr)),
+	MK_FLOW_ITEM(L2TPV3OIP, sizeof(struct rte_flow_item_l2tpv3oip)),
 };
 
 /** Generate flow_action[] entry. */

lib/librte_ethdev/rte_flow.h

@@ -510,6 +510,16 @@ enum rte_flow_item_type {
 	 * See struct rte_flow_item_tag.
 	 */
 	RTE_FLOW_ITEM_TYPE_TAG,
+
+	/**
+	 * Matches a L2TPv3 over IP header.
+	 *
+	 * Configure flow for L2TPv3 over IP packets.
+	 *
+	 * See struct rte_flow_item_l2tpv3oip.
+	 */
+	RTE_FLOW_ITEM_TYPE_L2TPV3OIP,
+
 };
 
 /**
@@ -1373,6 +1383,23 @@ static const struct rte_flow_item_tag rte_flow_item_tag_mask = {
 };
 #endif
 
+/**
+ * RTE_FLOW_ITEM_TYPE_L2TPV3OIP.
+ *
+ * Matches a L2TPv3 over IP header.
+ */
+struct rte_flow_item_l2tpv3oip {
+	rte_be32_t session_id; /**< Session ID. */
+};
+
+/** Default mask for RTE_FLOW_ITEM_TYPE_L2TPV3OIP. */
+#ifndef __cplusplus
+static const struct rte_flow_item_l2tpv3oip rte_flow_item_l2tpv3oip_mask = {
+	.session_id = RTE_BE32(UINT32_MAX),
+};
+#endif
+
+
 /**
  * @warning
  * @b EXPERIMENTAL: this structure may change without prior notice