ethdev: add represented port item to flow API

For use in "transfer" flows. Supposed to match traffic entering the
embedded switch from the entity represented by the given ethdev.
Such an entity can be a network (via a network port), a guest
machine (via a VF) or another ethdev in the same application.

Must not be combined with direction attributes.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Acked-by: Ori Kam <orika@nvidia.com>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

app/test-pmd/cmdline_flow.c

@@ -308,6 +308,8 @@ enum index {
 	ITEM_POL_POLICY,
 	ITEM_PORT_REPRESENTOR,
 	ITEM_PORT_REPRESENTOR_PORT_ID,
+	ITEM_REPRESENTED_PORT,
+	ITEM_REPRESENTED_PORT_ETHDEV_PORT_ID,
 
 	/* Validate/create actions. */
 	ACTIONS,
@@ -1002,6 +1004,7 @@ static const enum index next_item[] = {
 	ITEM_INTEGRITY,
 	ITEM_CONNTRACK,
 	ITEM_PORT_REPRESENTOR,
+	ITEM_REPRESENTED_PORT,
 	END_SET,
 	ZERO,
 };
@@ -1376,6 +1379,12 @@ static const enum index item_port_representor[] = {
 	ZERO,
 };
 
+static const enum index item_represented_port[] = {
+	ITEM_REPRESENTED_PORT_ETHDEV_PORT_ID,
+	ITEM_NEXT,
+	ZERO,
+};
+
 static const enum index next_action[] = {
 	ACTION_END,
 	ACTION_VOID,
@@ -3630,6 +3639,21 @@ static const struct token token_list[] = {
 			     item_param),
 		.args = ARGS(ARGS_ENTRY(struct rte_flow_item_ethdev, port_id)),
 	},
+	[ITEM_REPRESENTED_PORT] = {
+		.name = "represented_port",
+		.help = "match traffic entering the embedded switch from the entity represented by the given ethdev",
+		.priv = PRIV_ITEM(REPRESENTED_PORT,
+				  sizeof(struct rte_flow_item_ethdev)),
+		.next = NEXT(item_represented_port),
+		.call = parse_vc,
+	},
+	[ITEM_REPRESENTED_PORT_ETHDEV_PORT_ID] = {
+		.name = "ethdev_port_id",
+		.help = "ethdev port ID",
+		.next = NEXT(item_represented_port, NEXT_ENTRY(COMMON_UNSIGNED),
+			     item_param),
+		.args = ARGS(ARGS_ENTRY(struct rte_flow_item_ethdev, port_id)),
+	},
 	/* Validate/create actions. */
 	[ACTIONS] = {
 		.name = "actions",
@@ -8358,6 +8382,7 @@ flow_item_default_mask(const struct rte_flow_item *item)
 		mask = &rte_flow_item_pfcp_mask;
 		break;
 	case RTE_FLOW_ITEM_TYPE_PORT_REPRESENTOR:
+	case RTE_FLOW_ITEM_TYPE_REPRESENTED_PORT:
 		mask = &rte_flow_item_ethdev_mask;
 		break;
 	default:

doc/guides/nics/features/default.ini

@@ -125,6 +125,7 @@ pppoed               =
 pppoes               =
 pppoe_proto_id       =
 raw                  =
+represented_port     =
 sctp                 =
 tag                  =
 tcp                  =

doc/guides/prog_guide/rte_flow.rst

@@ -1484,6 +1484,52 @@ at the opposite end of the "wire" leading to the ethdev.
 
 - Default ``mask`` provides exact match behaviour.
 
+Item: ``REPRESENTED_PORT``
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Matches traffic entering the embedded switch from
+the entity represented by the given ethdev.
+
+Term **ethdev** and the concept of **port representor** are synonymous.
+The **represented port** is an *entity* plugged to the embedded switch
+at the opposite end of the "wire" leading to the ethdev.
+
+::
+
+    .--------------------.
+    |  PORT_REPRESENTOR  |  Ethdev (Application Port Referred to by its ID)
+    '--------------------'
+              :
+               :
+      .----------------.
+      |  Logical Port  |
+      '----------------'
+              :
+               :
+              :
+               :
+         .----------.
+         |  Switch  |
+         '----------'
+              /\
+              ||
+              ||
+              ||
+      .----------------.
+      |  Logical Port  |
+      '----------------'
+              /\
+              ||
+    .--------------------.
+    |  REPRESENTED_PORT  |  Net / Guest / Another Ethdev (Same Application)
+    '--------------------'
+
+
+- Incompatible with `Attribute: Traffic direction`_.
+- Requires `Attribute: Transfer`_.
+
+This item is meant to use the same structure as `Item: PORT_REPRESENTOR`_.
+
 Actions
 ~~~~~~~
 

doc/guides/rel_notes/release_21_11.rst

@@ -294,7 +294,7 @@ API Changes
 * net: Renamed ``s_addr`` and ``d_addr`` fields of ``rte_ether_hdr`` structure
   to ``src_addr`` and ``dst_addr``, respectively.
 
-* ethdev: Added item ``PORT_REPRESENTOR`` to flow API.
+* ethdev: Added items ``PORT_REPRESENTOR``, ``REPRESENTED_PORT`` to flow API.
 
 * cryptodev: The API rte_cryptodev_pmd_is_valid_dev is modified to
   rte_cryptodev_is_valid_dev as it can be used by the application as

doc/guides/testpmd_app_ug/testpmd_funcs.rst

@@ -3805,6 +3805,11 @@ This section lists supported pattern items and their attributes, if any.
 
   - ``port_id {unsigned}``: ethdev port ID
 
+- ``represented_port``: match traffic entering the embedded switch from
+  the entity represented by the given ethdev
+
+  - ``ethdev_port_id {unsigned}``: ethdev port ID
+
 Actions list
 ^^^^^^^^^^^^
 

lib/ethdev/rte_flow.c

@@ -101,6 +101,7 @@ static const struct rte_flow_desc_data rte_flow_desc_item[] = {
 	MK_FLOW_ITEM(INTEGRITY, sizeof(struct rte_flow_item_integrity)),
 	MK_FLOW_ITEM(CONNTRACK, sizeof(uint32_t)),
 	MK_FLOW_ITEM(PORT_REPRESENTOR, sizeof(struct rte_flow_item_ethdev)),
+	MK_FLOW_ITEM(REPRESENTED_PORT, sizeof(struct rte_flow_item_ethdev)),
 };
 
 /** Generate flow_action[] entry. */

lib/ethdev/rte_flow.h

@@ -583,6 +583,16 @@ enum rte_flow_item_type {
 	 * @see struct rte_flow_item_ethdev
 	 */
 	RTE_FLOW_ITEM_TYPE_PORT_REPRESENTOR,
+
+	/**
+	 * [META]
+	 *
+	 * Matches traffic entering the embedded switch from
+	 * the entity represented by the given ethdev.
+	 *
+	 * @see struct rte_flow_item_ethdev
+	 */
+	RTE_FLOW_ITEM_TYPE_REPRESENTED_PORT,
 };
 
 /**
@@ -1813,7 +1823,8 @@ static const struct rte_flow_item_conntrack rte_flow_item_conntrack_mask = {
  * @b EXPERIMENTAL: this structure may change without prior notice
  *
  * Provides an ethdev port ID for use with the following items:
- * RTE_FLOW_ITEM_TYPE_PORT_REPRESENTOR.
+ * RTE_FLOW_ITEM_TYPE_PORT_REPRESENTOR,
+ * RTE_FLOW_ITEM_TYPE_REPRESENTED_PORT.
  */
 struct rte_flow_item_ethdev {
 	uint16_t port_id; /**< ethdev port ID */