[v3,02/12] ethdev: add represented port item to flow API

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index a912a8d815..68698d805d 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/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,
@@ -1003,6 +1005,7 @@  static const enum index next_item[] = {
 	ITEM_INTEGRITY,
 	ITEM_CONNTRACK,
 	ITEM_PORT_REPRESENTOR,
+	ITEM_REPRESENTED_PORT,
 	END_SET,
 	ZERO,
 };
@@ -1377,6 +1380,12 @@  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,
@@ -3632,6 +3641,21 @@  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",
@@ -8368,6 +8392,7 @@  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:
diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 91d5bdd712..12a216c1e3 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/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
 ~~~~~~~
 
diff --git a/doc/guides/rel_notes/release_21_11.rst b/doc/guides/rel_notes/release_21_11.rst
index 1261cb2bf3..39ff16780b 100644
--- a/doc/guides/rel_notes/release_21_11.rst
+++ b/doc/guides/rel_notes/release_21_11.rst
@@ -188,7 +188,7 @@  API Changes
    Also, make sure to start the actual text at the margin.
    =======================================================
 
-* ethdev: Added item ``PORT_REPRESENTOR`` to flow API.
+* ethdev: Added items ``PORT_REPRESENTOR``, ``REPRESENTED_PORT`` to flow API.
 
 * kvargs: The experimental function ``rte_kvargs_strcmp()`` has been
   removed. Its usages have been replaced by a new function
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index dcb9f47d98..44a399899f 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3799,6 +3799,11 @@  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
 ^^^^^^^^^^^^
 
diff --git a/lib/ethdev/rte_flow.c b/lib/ethdev/rte_flow.c
index 5e9317c6d1..d4b654a2c6 100644
--- a/lib/ethdev/rte_flow.c
+++ b/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. */
diff --git a/lib/ethdev/rte_flow.h b/lib/ethdev/rte_flow.h
index 3625fd2c12..24d41aeb7b 100644
--- a/lib/ethdev/rte_flow.h
+++ b/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 */