[PATCH v5 1/3] node: support to add next node to ethdev Rx node

[Rakesh Kudurumalla <rkudurumalla@marvell.com>]

By default all packets received on ethdev_rx node
is forwarded to pkt_cls node.This patch provides
library support to add a new node as next node to
ethdev_rx node and forward packet to new node from
rx node.

Signed-off-by: Rakesh Kudurumalla <rkudurumalla@marvell.com>
---
V5: Addressed comments
    Handled negative test case

 lib/node/ethdev_ctrl.c      | 48 +++++++++++++++++++++++++++++++++++++
 lib/node/rte_node_eth_api.h | 18 ++++++++++++++
 lib/node/version.map        |  3 +++
 3 files changed, 69 insertions(+)

diff --git a/lib/node/ethdev_ctrl.c b/lib/node/ethdev_ctrl.c
index d564b80e37..b886d2fe32 100644
--- a/lib/node/ethdev_ctrl.c
+++ b/lib/node/ethdev_ctrl.c
@@ -3,6 +3,7 @@
  */
 
 #include <stdlib.h>
+#include <errno.h>
 
 #include <rte_ethdev.h>
 #include <rte_graph.h>
@@ -129,3 +130,50 @@ rte_node_eth_config(struct rte_node_ethdev_config *conf, uint16_t nb_confs,
 	ctrl.nb_graphs = nb_graphs;
 	return 0;
 }
+
+int
+rte_node_ethdev_rx_next_update(rte_node_t id, const char *edge_name)
+{
+	struct ethdev_rx_node_main *data;
+	ethdev_rx_node_elem_t *elem;
+	char **next_nodes;
+	int rc = -EINVAL;
+	uint32_t count;
+	uint16_t i = 0;
+
+	if (edge_name == NULL)
+		goto exit;
+
+	count = rte_node_edge_get(id, NULL);
+
+	if (count == RTE_NODE_ID_INVALID)
+		goto exit;
+
+	next_nodes = malloc(count);
+	if (next_nodes == NULL) {
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	count = rte_node_edge_get(id, next_nodes);
+
+	while (next_nodes[i] != NULL && i < count) {
+		if (strcmp(edge_name, next_nodes[i]) == 0) {
+			data = ethdev_rx_get_node_data_get();
+			elem = data->head;
+			while (elem->next != data->head) {
+				if (elem->nid == id) {
+					elem->ctx.cls_next = i;
+					rc = 0;
+					goto found;
+				}
+				elem = elem->next;
+			}
+		}
+		i++;
+	}
+found:
+	free(next_nodes);
+exit:
+	return rc;
+}
diff --git a/lib/node/rte_node_eth_api.h b/lib/node/rte_node_eth_api.h
index eaae50772d..5b5ca491dc 100644
--- a/lib/node/rte_node_eth_api.h
+++ b/lib/node/rte_node_eth_api.h
@@ -23,6 +23,7 @@ extern "C" {
 #include <rte_compat.h>
 #include <rte_common.h>
 #include <rte_mempool.h>
+#include <rte_graph.h>
 
 /**
  * Port config for ethdev_rx and ethdev_tx node.
@@ -57,6 +58,23 @@ struct rte_node_ethdev_config {
  */
 int rte_node_eth_config(struct rte_node_ethdev_config *cfg,
 			uint16_t cnt, uint16_t nb_graphs);
+
+/**
+ * Update ethdev rx next node.
+ *
+ * @param id
+ *   Node id whose edge is to be updated.
+ * @param edge_name
+ *   Name of the next node.
+ *
+ * @return
+ *   ENINVAL: Either of input parameters are invalid
+ *   ENOMEM: If memory allocation failed
+ *   0 on successful initialization.
+ */
+__rte_experimental
+int rte_node_ethdev_rx_next_update(rte_node_t id, const char *edge_name);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/node/version.map b/lib/node/version.map
index 99ffcdd414..6bdb944c4c 100644
--- a/lib/node/version.map
+++ b/lib/node/version.map
@@ -19,4 +19,7 @@ EXPERIMENTAL {
 	rte_node_ip4_reassembly_configure;
 	rte_node_udp4_dst_port_add;
 	rte_node_udp4_usr_node_add;
+
+	# added in 24.03
+	rte_node_ethdev_rx_next_update;
 };
-- 
2.25.1