[RFC,2/3] graph: add feature arc option in graph create

diff --git a/lib/graph/graph.c b/lib/graph/graph.c
index d5b8c9f918..b0ad3a83ae 100644
--- a/lib/graph/graph.c
+++ b/lib/graph/graph.c
@@ -455,6 +455,7 @@  rte_graph_create(const char *name, struct rte_graph_param *prm)
 	graph->parent_id = RTE_GRAPH_ID_INVALID;
 	graph->lcore_id = RTE_MAX_LCORE;
 	graph->num_pkt_to_capture = prm->num_pkt_to_capture;
+	graph->feature_arc_enabled = prm->feature_arc_enable;
 	if (prm->pcap_filename)
 		rte_strscpy(graph->pcap_filename, prm->pcap_filename, RTE_GRAPH_PCAP_FILE_SZ);
 
diff --git a/lib/graph/graph_populate.c b/lib/graph/graph_populate.c
index ed596a7711..2892f3cce2 100644
--- a/lib/graph/graph_populate.c
+++ b/lib/graph/graph_populate.c
@@ -79,8 +79,13 @@  graph_nodes_populate(struct graph *_graph)
 		if (graph_pcap_is_enable()) {
 			node->process = graph_pcap_dispatch;
 			node->original_process = graph_node->node->process;
-		} else
+			if (_graph->feature_arc_enabled)
+				node->original_process = graph_node->node->feat_arc_proc;
+		} else {
 			node->process = graph_node->node->process;
+			if (_graph->feature_arc_enabled)
+				node->process = graph_node->node->feat_arc_proc;
+		}
 		memcpy(node->name, graph_node->node->name, RTE_GRAPH_NAMESIZE);
 		pid = graph_node->node->parent_id;
 		if (pid != RTE_NODE_ID_INVALID) { /* Cloned node */
diff --git a/lib/graph/graph_private.h b/lib/graph/graph_private.h
index d557d55f2d..58ba0abeff 100644
--- a/lib/graph/graph_private.h
+++ b/lib/graph/graph_private.h
@@ -56,6 +56,7 @@  struct node {
 	unsigned int lcore_id;
 	/**< Node runs on the Lcore ID used for mcore dispatch model. */
 	rte_node_process_t process;   /**< Node process function. */
+	rte_node_process_t feat_arc_proc; /**< Node feature-arch process function. */
 	rte_node_init_t init;         /**< Node init function. */
 	rte_node_fini_t fini;	      /**< Node fini function. */
 	rte_node_t id;		      /**< Allocated identifier for the node. */
@@ -126,6 +127,8 @@  struct graph {
 	/**< Number of packets to be captured per core. */
 	char pcap_filename[RTE_GRAPH_PCAP_FILE_SZ];
 	/**< pcap file name/path. */
+	uint8_t feature_arc_enabled;
+	/**< Graph feature arc. */
 	STAILQ_HEAD(gnode_list, graph_node) node_list;
 	/**< Nodes in a graph. */
 };
diff --git a/lib/graph/node.c b/lib/graph/node.c
index 99a9622779..d8fd273543 100644
--- a/lib/graph/node.c
+++ b/lib/graph/node.c
@@ -90,6 +90,7 @@  __rte_node_register(const struct rte_node_register *reg)
 		goto free;
 	node->flags = reg->flags;
 	node->process = reg->process;
+	node->feat_arc_proc = reg->feat_arc_proc;
 	node->init = reg->init;
 	node->fini = reg->fini;
 	node->nb_edges = reg->nb_edges;
@@ -137,6 +138,7 @@  node_clone(struct node *node, const char *name)
 	/* Clone the source node */
 	reg->flags = node->flags;
 	reg->process = node->process;
+	reg->feat_arc_proc = node->feat_arc_proc;
 	reg->init = node->init;
 	reg->fini = node->fini;
 	reg->nb_edges = node->nb_edges;
diff --git a/lib/graph/rte_graph.h b/lib/graph/rte_graph.h
index ecfec2068a..ebbdbbea48 100644
--- a/lib/graph/rte_graph.h
+++ b/lib/graph/rte_graph.h
@@ -163,6 +163,8 @@  struct rte_graph_param {
 	uint64_t num_pkt_to_capture; /**< Number of packets to capture. */
 	char *pcap_filename; /**< Filename in which packets to be captured.*/
 
+	bool feature_arc_enable; /**< Enable Graph feature arc. */
+
 	union {
 		struct {
 			uint64_t rsvd; /**< Reserved for rtc model. */
@@ -470,6 +472,7 @@  struct rte_node_register {
 	uint64_t flags;		      /**< Node configuration flag. */
 #define RTE_NODE_SOURCE_F (1ULL << 0) /**< Node type is source. */
 	rte_node_process_t process; /**< Node process function. */
+	rte_node_process_t feat_arc_proc; /**< Node feature-arch process function. */
 	rte_node_init_t init;       /**< Node init function. */
 	rte_node_fini_t fini;       /**< Node fini function. */
 	rte_node_t id;		    /**< Node Identifier. */