[PATCH v11 2/7] graph: add feature arc registrations

[Nitin Saxena <nsaxena@marvell.com>]

This patch defines RTE_GRAPH_FEATURE_ARC_REGISTER() and
RTE_GRAPH_FEATURE_REGISTER() constructors and associated APIs with
programming guide.

Signed-off-by: Nitin Saxena <nsaxena@marvell.com>
---
 doc/api/doxy-api-index.md                   |   1 +
 doc/guides/prog_guide/graph_lib.rst         | 289 +++++++++++
 doc/guides/prog_guide/img/feature_arc-1.svg | 269 +++++++++++
 doc/guides/prog_guide/img/feature_arc-2.svg | 511 ++++++++++++++++++++
 doc/guides/rel_notes/release_25_07.rst      |   7 +
 lib/graph/graph_feature_arc.c               |  36 ++
 lib/graph/meson.build                       |   2 +
 lib/graph/rte_graph_feature_arc.h           | 270 +++++++++++
 8 files changed, 1385 insertions(+)
 create mode 100644 doc/guides/prog_guide/img/feature_arc-1.svg
 create mode 100644 doc/guides/prog_guide/img/feature_arc-2.svg
 create mode 100644 lib/graph/graph_feature_arc.c
 create mode 100644 lib/graph/rte_graph_feature_arc.h

diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index 5c425a2cb9..a7bdbf892c 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -214,6 +214,7 @@ The public API headers are grouped by topics:
     [table_wm](@ref rte_swx_table_wm.h)
   * [graph](@ref rte_graph.h):
     [graph_worker](@ref rte_graph_worker.h)
+    [graph_feature_arc](@ref rte_graph_feature_arc.h)
   * graph_nodes:
     [eth_node](@ref rte_node_eth_api.h),
     [ip4_node](@ref rte_node_ip4_api.h),
diff --git a/doc/guides/prog_guide/graph_lib.rst b/doc/guides/prog_guide/graph_lib.rst
index dc6c8c0712..191c8e8a0b 100644
--- a/doc/guides/prog_guide/graph_lib.rst
+++ b/doc/guides/prog_guide/graph_lib.rst
@@ -559,3 +559,292 @@ on success packet is enqueued to ``udp4_input`` node.

 Hash lookup is performed in ``udp4_input`` node with registered destination port
 and destination port in UDP packet , on success packet is handed to ``udp_user_node``.
+
+Graph feature arc
+-----------------
+Introduction
+~~~~~~~~~~~~
+Graph feature arc is an abstraction to manage more than one network protocols(or
+features) in a graph application with
+
+* Runtime network configurability
+* Overloading of default node packet path
+* Control/Data plane synchronization
+
+.. note::
+
+   Feature arc abstraction is introduced as an optional functionality to the
+   graph library. Feature arc is a ``NOP`` to application which skips
+   :ref:`feature arc initialization<Feature_Arc_Initialization>`
+
+Runtime network configurability
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Feature arc facilitates to enable/disable protocols at runtime from control
+thread.  In fast path, it provides APIs to steer packets across nodes of those
+protocols which are enabled from control thread.
+
+Feature arc uses ``index`` object to enable/disable a protocol which is generic
+to cater all the possibilities of configuring a protocol. Examples of ``index``
+object are interface index, route index, flow index, classification index etc.
+
+Runtime configuration of one ``index`` is independent of another ``index``
+configuration. In other words, packet received on an interface0 are steered
+independent from packets received on interface1. Both interface0 and interface1
+can have separate sets of protocols enabled at the same time.
+
+Feature arc also provides mechanism to express ``protocol sequencing order``
+for packets. If more than one protocols are active in a network layer, packets
+may be required to be steered among protocol nodes in a specific order. For
+example: in a typical firewall IPv4, IPsec and IP tables may be enabled at the
+same time in IP layer. Feature arc provides mechanism to express sequence
+order in which protocol nodes are to be traversed by packets received/sent on
+an interface.
+
+Default node packet path overloading
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Each network function has defined node packet path. As an example, IPv4 router
+as a forwarder includes nodes performing - packet ingress, ethernet reception,
+IPv4 reception, IPv4 lookup, ethernet rewrite and packet egress. Feature arc
+provides application to overload default node path by providing hook
+points(like netfilter) to insert out-of-tree or another protocol nodes in
+packet path.
+
+Control/Data plane synchronization
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Feature arc does not stop worker cores for any runtime control plane updates.
+i.e. any feature(protocol) enable/disable at runtime does not stop worker
+cores. Control plane feature enable/disable APIs also provides RCU mechanism,
+if needed.
+
+When a feature is enabled in control plane, certain resources may be allocated
+by application specific to ``[feature, index]``. For example when IPsec is
+enabled either on an interface(policy based IPsec) or route(route based IPsec),
+a security association(SA) would be allocated/initialized and attached to
+interface/route. Feature arc APIs are provided to pass SA from control thread
+to worker threads for applying it(SA) on packets received/sent via
+interface or SA tunnel route.
+
+Furthermore, when IPsec gets disabled for same ``[feature, index]`` in later
+point of time, cleanup would be required to free resources associated with SA.
+Cleanup can only be done in control thread when it ensures that no worker
+thread is using the SA. For this usecase, application can use RCU mechanism
+provided with enable/disable APIs. See :ref:`notifier_cb<Feature_Notifier_Cb>`.
+
+Objects
+~~~~~~~
+Feature
+^^^^^^^
+Feature is analogous to a protocol.
+
+.. _Feature_Nodes:
+
+Features nodes
+^^^^^^^^^^^^^^
+A feature node is a node which performs specific feature processing in a given
+network layer. Feature nodes incorporates fast path feature arc APIs in their
+``process()`` function and are part of a unique arc.
+
+Not all nodes in graph required to be made feature nodes.
+
+.. _Start_Node:
+
+Start node
+^^^^^^^^^^
+A node through which packets enters feature arc path is called ``Start node``.
+It is a node which provides a hook point to overload node packet path. Each
+feature arc object has unique ``start node``. It can be a new node or any
+existing node in a graph. Start node is not counted as a feature node in an arc.
+
+.. _End_Feature_Node:
+
+End feature node
+^^^^^^^^^^^^^^^^
+An end feature node is a feature node through which packets exits feature arc
+path.  It is required for exiting packets, from feature arc path, which are
+getting processed by feature node which is getting disabled at runtime in
+control thread. It is always the last feature node in an arc. As an exception
+to other feature nodes, this node does not uses any feature arc fast path APIs
+
+Feature arc
+^^^^^^^^^^^
+
+.. _Figure_Arc_1:
+
+.. figure:: img/feature_arc-1.*
+   :alt: feature-arc-1
+   :width: 350px
+   :align: center
+
+   Feature arc representation
+
+A ordered list of feature nodes in a given network layer is called as feature arc.
+It consists of three objects:
+
+- :ref:`Start node<Start_Node>`
+- :ref:`End feature node<End_Feature_Node>`
+- :ref:`Zero or more feature nodes<Feature_Nodes>`
+
+In order to :ref:`create<Feature_Arc_Registration>` a feature arc object only
+``start node`` and ``end feature node`` is required. Once created, feature
+nodes can be :ref:`added<Feature_Registration>` to the arc.
+
+Feature data
+^^^^^^^^^^^^
+It is a fast path object which hold information to steer packets across nodes.
+
+Programming model
+~~~~~~~~~~~~~~~~~
+
+Arc/Feature Registrations
+^^^^^^^^^^^^^^^^^^^^^^^^^
+Feature arc and feature registrations happens using constructor based macros.
+While feature arc registration creates a feature arc object, the feature
+registration adds provided node to a feature arc object.
+
+.. note::
+
+   During registration, no memory is allocated associated with any feature arc.
+   Actual memory allocation, object creation and connecting of nodes via edges
+   corresponding to all registered feature arcs happens as part of
+   :ref:`feature arc initialization<Feature_Arc_Initialization>`.
+
+.. _Feature_Arc_Registration:
+
+Feature arc registration
+************************
+A feature arc object creation require ``feature arc registration``. Once
+registered, feature arc is created as part of
+:ref:`initialization<Feature_Arc_Initialization>`. A feature arc is registered
+via ``RTE_GRAPH_FEATURE_ARC_REGISTER()``. An arc shown in
+:ref:`figure<Figure_Arc_1>` can be registered as follows:
+
+.. code-block:: c
+
+    /* Existing nodes */
+    RTE_NODE_REGISTER(Node-A);
+    RTE_NODE_REGISTER(Node-B);
+
+    /* Define End feature node: Node-B*/
+    struct rte_graph_feature_register Node-B-feature = {
+        .feature_name = "Node-B-feature",
+        .arc_name = "Arc1",
+        .feature_process_fn = nodeB_process_fn(),
+        .feature_node = &Node-B,
+    };
+
+    /* Arc1 registration */
+    struct rte_graph_feature_arc_register arc1 = {
+        .arc_name = "Arc1",
+        .max_indexes = RTE_MAX_ETHPORTS,
+        .start_node = &Node-A,
+        .start_node_feature_process_fn = nodeA_feature_process_fn(),
+        .end_feature_node = &Node-B-feature,
+    };
+
+    /* Call constructor */
+     RTE_GRAPH_FEATURE_ARC_REGISTER(arc1);
+
+.. note::
+
+   Feature arc can also be created using ``rte_graph_feature_arc_create()`` API as well
+
+.. _Feature_Registration:
+
+Feature registration
+********************
+A feature registration means defining a feature node which would be added to a
+unique ``arc``. A feature nodes needs to know ``arc name`` to which it wants to
+connect to. Registration happens via ``RTE_GRAPH_FEATURE_REGISTER()``.
+
+A ``Feature-1`` shown in :ref:`figure<Figure_Arc_1>` can be registered as follows:
+
+.. code-block:: c
+
+    /* Existing node */
+    RTE_NODE_REGISTER(Feature-1);
+
+    /* Define feature node: Feature-1 */
+    struct rte_graph_feature_register Feature-1 = {
+        .feature_name = "Feature-1",
+        .arc_name = "Arc1",
+        .feature_process_fn = feature1_process_fn(),
+        .feature_node = &Feature-1,
+    };
+
+    /* Call constructor */
+    RTE_GRAPH_FEATURE_REGISTER(Feature-1);
+
+.. note::
+
+   A feature node can be out-of-tree application node which is willing to
+   connect to an arc defined by DPDK in-built nodes. This way application can
+   hook it's node to standard node packet path.
+
+Advance parameters
+``````````````````
+.. _Figure_Arc_2:
+
+.. figure:: img/feature_arc-2.*
+   :alt: feature-arc-2
+   :width: 550px
+   :align: center
+
+   Feature registration advance parameters
+
+Feature registration have some advance parameters to control the feature node.
+As shown in above figure, ``Custom Feature`` and ``Feature-2`` nodes can be
+added to existing arc as follows:
+
+.. code-block:: c
+
+    /* Define feature node: Custom-Feature */
+    struct rte_graph_feature_register Custom-Feature = {
+        .feature_name = "Custom-Feature",
+        .arc_name = "Arc1",
+            ...
+            ...
+            ...
+        .notifier_cb = Custom-Feature_notifier_fn(),  /* Optional notifier function */
+        .runs_after = "Feature-1",
+    };
+
+    /* Define feature node: Feature-2 */
+    struct rte_graph_feature_register Feature-2 = {
+        .feature_name = "Feature-2",
+        .arc_name = "Arc1",
+            ...
+            ...
+            ...
+        .override_index_cb = Feature-3_override_index_cb(),
+        .runs_after = "Feature-1",
+        .runs_before = "Custom-Feature",
+    };
+
+runs_after/runs_before
+......................
+These parameters are used to express the sequencing order of feature nodes.  If
+``Custome Feature`` needs to run after ``Feature-1`` it can be defined as shown
+above. Similarly, if ``Feature-2`` needs to run before ``Custome-Feature`` but
+after ``Feature-1`` it can be done as shown above.
+
+.. _Feature_Notifier_Cb:
+
+notifier_cb()
+.............
+If non-NULL, every feature enable/disable in control plane will invoke the
+notifier callback on control thread. This notifier callback can be used to
+destroy resources for ``[feature, index]`` pair during ``feature disable``
+which might have allocated during feature enable.
+
+notifier_cb() is called, at runtime, for every enable/disable of ``[feature,
+index]`` from control thread.
+
+override_index_cb()
+....................
+A feature arc is :ref:`registered<Feature_Arc_Registration>` to operate on
+certain number of ``max_indexes``. If particular feature like to overload this
+``max_indexes`` with a larger value it can do so by returning larger value in
+this callback. In case of multiple features, largest value returned by any
+feature would be selected for creating feature arc.
+
+.. _Feature_Arc_Initialization:
diff --git a/doc/guides/prog_guide/img/feature_arc-1.svg b/doc/guides/prog_guide/img/feature_arc-1.svg
new file mode 100644
index 0000000000..1c6b83f18f
--- /dev/null
+++ b/doc/guides/prog_guide/img/feature_arc-1.svg
@@ -0,0 +1,269 @@
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diff --git a/doc/guides/prog_guide/img/feature_arc-2.svg b/doc/guides/prog_guide/img/feature_arc-2.svg
new file mode 100644
index 0000000000..990c96f306
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diff --git a/doc/guides/rel_notes/release_25_07.rst b/doc/guides/rel_notes/release_25_07.rst
index a4962e46d6..3164957964 100644
--- a/doc/guides/rel_notes/release_25_07.rst
+++ b/doc/guides/rel_notes/release_25_07.rst
@@ -87,6 +87,13 @@ New Features

   See the :doc:`../cryptodevs/zsda` guide for more details on the new driver.

+* **Added feature arc abstraction in graph library.**
+
+  Feature arc helps ``rte_graph`` based applications to manage multiple network
+  protocols/features with runtime configurability, in-built node-reusability
+  and optimized control/data plane synchronization.
+
+  See section ``Graph feature arc`` in :doc:`../prog_guide/graph_lib` for more details.

 Removed Items
 -------------
diff --git a/lib/graph/graph_feature_arc.c b/lib/graph/graph_feature_arc.c
new file mode 100644
index 0000000000..6135b262d5
--- /dev/null
+++ b/lib/graph/graph_feature_arc.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2025 Marvell International Ltd.
+ */
+
+#include <rte_graph_feature_arc.h>
+#include <eal_export.h>
+#include "graph_private.h"
+
+/* global feature arc list */
+static STAILQ_HEAD(, rte_graph_feature_arc_register) feature_arc_list =
+					STAILQ_HEAD_INITIALIZER(feature_arc_list);
+
+/* global feature arc list */
+static STAILQ_HEAD(, rte_graph_feature_register) feature_list =
+					STAILQ_HEAD_INITIALIZER(feature_list);
+
+RTE_EXPORT_EXPERIMENTAL_SYMBOL(__rte_graph_feature_arc_register, 25.07);
+void __rte_graph_feature_arc_register(struct rte_graph_feature_arc_register *reg,
+				      const char *caller_name, int lineno)
+{
+	RTE_SET_USED(caller_name);
+	RTE_SET_USED(lineno);
+	/* Do not validate arc registration here but as part of rte_graph_feature_arc_init() */
+	STAILQ_INSERT_TAIL(&feature_arc_list, reg, next_arc);
+}
+
+RTE_EXPORT_EXPERIMENTAL_SYMBOL(__rte_graph_feature_register, 25.07);
+void __rte_graph_feature_register(struct rte_graph_feature_register *reg,
+				  const char *caller_name, int lineno)
+{
+	RTE_SET_USED(caller_name);
+	RTE_SET_USED(lineno);
+
+	/* Add to the feature_list*/
+	STAILQ_INSERT_TAIL(&feature_list, reg, next_feature);
+}
diff --git a/lib/graph/meson.build b/lib/graph/meson.build
index 0cb15442ab..1b2f493037 100644
--- a/lib/graph/meson.build
+++ b/lib/graph/meson.build
@@ -17,8 +17,10 @@ sources = files(
         'graph_pcap.c',
         'rte_graph_worker.c',
         'rte_graph_model_mcore_dispatch.c',
+        'graph_feature_arc.c',
 )
 headers = files('rte_graph.h', 'rte_graph_worker.h')
+headers += files('rte_graph_feature_arc.h')
 indirect_headers += files(
         'rte_graph_model_mcore_dispatch.h',
         'rte_graph_model_rtc.h',
diff --git a/lib/graph/rte_graph_feature_arc.h b/lib/graph/rte_graph_feature_arc.h
new file mode 100644
index 0000000000..56d8f2f34c
--- /dev/null
+++ b/lib/graph/rte_graph_feature_arc.h
@@ -0,0 +1,270 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2025 Marvell International Ltd.
+ */
+
+#ifndef _RTE_GRAPH_FEATURE_ARC_H_
+#define _RTE_GRAPH_FEATURE_ARC_H_
+
+#include <assert.h>
+#include <errno.h>
+#include <signal.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <rte_common.h>
+#include <rte_compat.h>
+#include <rte_debug.h>
+#include <rte_graph.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file
+ *
+ * rte_graph_feature_arc.h
+ *
+ * Define APIs and structures/variables with respect to feature arc
+ *
+ * - Feature arc(s)
+ * - Feature(s)
+ *
+ * In a typical network stack, often a protocol must be first enabled in
+ * control plane before any packet is steered for its processing in the
+ * dataplane. For eg: incoming IPv4 packets are routed only after a valid IPv4
+ * address is assigned to the received interface. In other words, often packets
+ * received on an interface need to be steered to protocol not based on the
+ * packet content but based on whether the protocol is configured on the
+ * interface or not.
+ *
+ * Protocols can be enabled/disabled multiple times at runtime in the control
+ * plane. Protocols enabled on one interface may not be enabled on another
+ * interface.
+ *
+ * When more than one protocols are present at a networking layer (say IPv4,
+ * IP tables, IPsec etc), it becomes imperative to steer packets (in dataplane)
+ * across each protocol processing in a defined sequential order. In ingress
+ * direction, stack decides to perform IPsec decryption first before IP
+ * validation while in egress direction IPsec encryption is performed after IP
+ * forwarding. In the case of IP tables, users can enable rules in any
+ * protocol order i.e. pre-routing or post-routing etc. This implies that
+ * protocols are configured differently at each networking layer and in each
+ * traffic direction.
+ *
+ * A feature arc represents an ordered list of features/protocols nodes at the
+ * given networking layer and in a given direction. It provides a high level
+ * abstraction to enable/disable features on an index at runtime and provide a
+ * mechanism to steer packets across these feature nodes in a generic manner.
+ * Here index corresponds to either interface index, route index, flow index or
+ * classification index etc. as it is deemed suitable to configure protocols at
+ * the networking layer. Some typical examples of protocols which are
+ * configured based on
+ *
+ * - Interface Index (like IPv4 VRF, Port mirroring, Port based IPsec etc)
+ * - Routes Index (like Route based IPsec etc)
+ * - Flow index (like SDN)
+ * - Classification Index (like ACL based protocol steering)
+ *
+ * Feature arc also provides a way to steer packets from in-built DPDK *feature
+ * nodes* to out-of-tree *feature nodes* and vice-versa without any code
+ * changes required in DPDK in-built node's fast path functions. This way it
+ * allows application to override default packet path defined by in-built DPDK
+ * nodes.
+ *
+ * Features enabled on one index may not be enabled on another index hence
+ * packets received on an interface "X" should be treated independently from
+ * packets received on interface "Y".
+ *
+ * A given feature might consume packet (if it's configured to consume) or may
+ * forward it to next enabled feature. For instance, "IPsec input" feature may
+ * consume/drop all packets with "Protect" policy action while all packets with
+ * policy action as "Bypass" may be forwarded to next enabled feature (with in
+ * same feature arc)
+ *
+ * A feature arc in a graph is represented via *start_node* and *end_node*.
+ * Feature nodes are added between start_node and end_node. Packets enter
+ * feature arc traversal via start_node while they exits from end_node. Packets
+ * steering from start_node to feature nodes are controlled in control plane
+ * via rte_graph_feature_enable()/rte_graph_feature_disable().
+ *
+ * This library facilitates rte graph based applications to implement stack
+ * functionalities described above by providing "edge" to the next enabled
+ * feature node in fast path
+ *
+ */
+
+/** feature notifier callback called when feature is enabled/disabled */
+typedef void (*rte_graph_feature_change_notifier_cb_t)(const char *arc_name,
+						       const char *feature_name,
+						       rte_node_t feature_node_id,
+						       uint32_t index,
+						       bool enable_disable,
+						       uint16_t app_cookie);
+
+/** cb for overriding arc->max_indexes via RTE_GRAPH_FEATURE_REGISTER() */
+typedef uint16_t (*rte_graph_feature_override_index_cb_t)(void);
+
+/**
+ *  Feature registration structure provided to
+ *  RTE_GRAPH_FEATURE_REGISTER()
+ */
+struct rte_graph_feature_register {
+	/**
+	 * Pointer to next registered feature in the same arc.
+	 */
+	STAILQ_ENTRY(rte_graph_feature_register) next_feature;
+
+	/** Name of the arc which is registered either via
+	 * RTE_GRAPH_FEATURE_ARC_REGISTER() or via
+	 * rte_graph_feature_arc_create()
+	 */
+	const char *arc_name;
+
+	/** Name of the feature */
+	const char *feature_name;
+
+	/**
+	 * Node id of feature_node.
+	 *
+	 * Setting this field can be skipped if registering feature via
+	 * RTE_GRAPH_FEATURE_REGISTER()
+	 */
+	rte_node_t feature_node_id;
+
+	/**
+	 * Feature node process() function calling feature fast path APIs.
+	 *
+	 * If application calls rte_graph_feature_arc_init(), node->process()
+	 * provided in RTE_NODE_REGISTER() is overwritten by this
+	 * function.
+	 */
+	rte_node_process_t feature_process_fn;
+
+	/**
+	 * Pointer to Feature node registration
+	 *
+	 * Used when features are registered via
+	 * RTE_GRAPH_FEATURE_REGISTER().
+	 */
+	struct rte_node_register *feature_node;
+
+	/** Feature ordering constraints
+	 * runs_after: Name of the feature which must run before "this feature"
+	 * runs_before: Name of the feature which must run after "this feature"
+	 */
+	const char *runs_after;
+	const char *runs_before;
+
+	/**
+	 * Allow each feature registration to override arc->max_indexes
+	 *
+	 * If set, struct rte_graph_feature_arc_register::max_indexes is
+	 * calculated as follows (before calling rte_graph_feature_arc_create())
+	 *
+	 * max_indexes = rte_graph_feature_arc_register:max_indexes
+	 * FOR_EACH_FEATURE_REGISTER(arc, feat) {
+	 *   rte_graph_feature_arc_register:max_indexes = max(feat->override_index_cb(),
+	 *                                                    max_indexes)
+	 */
+	rte_graph_feature_override_index_cb_t override_index_cb;
+
+	/**
+	 * Callback for notifying any change in feature enable/disable state
+	 */
+	rte_graph_feature_change_notifier_cb_t notifier_cb;
+};
+
+/** Feature arc registration structure */
+struct rte_graph_feature_arc_register {
+	STAILQ_ENTRY(rte_graph_feature_arc_register) next_arc;
+
+	/** Name of the feature arc */
+	const char *arc_name;
+
+	/**
+	 * Maximum number of features supported in this feature arc.
+	 *
+	 * This field can be skipped for feature arc registration via
+	 * RTE_GRAPH_FEATURE_ARC_REGISTER().
+	 *
+	 * API internally sets this field by calculating number of
+	 * RTE_GRAPH_FEATURE_REGISTER() for every arc registration via
+	 * RTE_GRAPH_FEATURE_ARC_REGISTER()
+	 */
+	uint16_t max_features;
+
+	/**
+	 * Maximum number of indexes supported in this feature arc
+	 * Memory is allocated based on this field
+	 */
+	uint16_t max_indexes;
+
+	/** Start node of this arc */
+	struct rte_node_register *start_node;
+
+	/**
+	 * Feature arc specific process() function for Start node.
+	 * If application calls rte_graph_feature_arc_init(),
+	 * start_node->process() is replaced by this function
+	 */
+	rte_node_process_t start_node_feature_process_fn;
+
+	/** End feature node registration */
+	struct rte_graph_feature_register *end_feature;
+};
+
+/** constructor to register feature to an arc */
+#define RTE_GRAPH_FEATURE_REGISTER(reg)                                                 \
+	RTE_INIT(__rte_graph_feature_register_##reg)                                    \
+	{                                                                               \
+		__rte_graph_feature_register(&reg, __func__, __LINE__);                 \
+	}
+
+/** constructor to register a feature arc */
+#define RTE_GRAPH_FEATURE_ARC_REGISTER(reg)                                             \
+	RTE_INIT(__rte_graph_feature_arc_register_##reg)                                \
+	{                                                                               \
+		__rte_graph_feature_arc_register(&reg, __func__, __LINE__);             \
+	}
+
+/**
+ * @internal
+ *
+ * function declaration for registering arc
+ *
+ * @param reg
+ *      Pointer to struct rte_graph_feature_arc_register
+ *  @param caller_name
+ *      Name of the function which is calling this API
+ *  @param lineno
+ *      Line number of the function which is calling this API
+ */
+__rte_experimental
+void __rte_graph_feature_arc_register(struct rte_graph_feature_arc_register *reg,
+				      const char *caller_name, int lineno);
+
+/**
+ * @internal
+ *
+ * function declaration for registering feature
+ *
+ * @param reg
+ *      Pointer to struct rte_graph_feature_register
+ * @param caller_name
+ *      Name of the function which is calling this API
+ * @param lineno
+ *      Line number of the function which is calling this API
+ */
+__rte_experimental
+void __rte_graph_feature_register(struct rte_graph_feature_register *reg,
+				  const char *caller_name, int lineno);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
2.43.0