[PATCH v2 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>
---
V2: Addressed comments 
    Splitted patches to add command and usecsase
    Updated doc for portforward usecase

 lib/node/ethdev_ctrl.c      | 44 +++++++++++++++++++++++++++++++++++++
 lib/node/rte_node_eth_api.h | 19 ++++++++++++++++
 lib/node/version.map        |  1 +
 3 files changed, 64 insertions(+)

diff --git a/lib/node/ethdev_ctrl.c b/lib/node/ethdev_ctrl.c
index d564b80e37..e057847cb5 100644
--- a/lib/node/ethdev_ctrl.c
+++ b/lib/node/ethdev_ctrl.c
@@ -129,3 +129,47 @@ 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)
+		return -ENODATA;
+
+	count = rte_node_edge_get(id, NULL);
+
+	if (count == RTE_NODE_ID_INVALID)
+		return rc;
+
+	next_nodes = malloc(count);
+	if (next_nodes == NULL)
+		return -ENOMEM;
+
+	count = rte_node_edge_get(id, next_nodes);
+
+	while (next_nodes[i] != NULL) {
+		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 exit;
+				}
+				elem = elem->next;
+			}
+		}
+		i++;
+	}
+exit:
+	free(next_nodes);
+	return rc;
+}
diff --git a/lib/node/rte_node_eth_api.h b/lib/node/rte_node_eth_api.h
index eaae50772d..f99e565b30 100644
--- a/lib/node/rte_node_eth_api.h
+++ b/lib/node/rte_node_eth_api.h
@@ -57,6 +57,25 @@ 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
+ *   RTE_EDGE_ID_INVALID if id is invalid
+ *   ENINVAL: Either of input parameters are invalid
+ *   ENODATA: If edge_name is not found
+ *   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..07abc3a79f 100644
--- a/lib/node/version.map
+++ b/lib/node/version.map
@@ -16,6 +16,7 @@ EXPERIMENTAL {
 	rte_node_ip6_route_add;
 
 	# added in 23.11
+	rte_node_ethdev_rx_next_update;
 	rte_node_ip4_reassembly_configure;
 	rte_node_udp4_dst_port_add;
 	rte_node_udp4_usr_node_add;
-- 
2.25.1