[RFC, v1 1/6] graph: introduce core affinity API into graph

[Zhirun Yan]

1. add lcore_id for node to hold affinity core id
2. impl rte_node_set_lcore_affinity to affinity node with one lcore
3. update version map for graph public API

Signed-off-by: Haiyue Wang <haiyue.wang at intel.com>
Signed-off-by: Cunming Liang <cunming.liang at intel.com>
Signed-off-by: Zhirun Yan <zhirun.yan at intel.com>
---
 lib/graph/graph_private.h |  1 +
 lib/graph/node.c          | 25 +++++++++++++++++++++++++
 lib/graph/rte_graph.h     | 15 +++++++++++++++
 lib/graph/version.map     |  1 +
 4 files changed, 42 insertions(+)

diff --git a/lib/graph/graph_private.h b/lib/graph/graph_private.h
index f9a85c8926..627090f802 100644
--- a/lib/graph/graph_private.h
+++ b/lib/graph/graph_private.h
@@ -49,6 +49,7 @@ struct node {
 	STAILQ_ENTRY(node) next;      /**< Next node in the list. */
 	char name[RTE_NODE_NAMESIZE]; /**< Name of the node. */
 	uint64_t flags;		      /**< Node configuration flag. */
+	unsigned int lcore_id;        /**< Node runs on the Lcore ID */
 	rte_node_process_t process;   /**< Node process function. */
 	rte_node_init_t init;         /**< Node init function. */
 	rte_node_fini_t fini;	      /**< Node fini function. */
diff --git a/lib/graph/node.c b/lib/graph/node.c
index ae6eadb260..2ce031886b 100644
--- a/lib/graph/node.c
+++ b/lib/graph/node.c
@@ -99,6 +99,7 @@ __rte_node_register(const struct rte_node_register *reg)
 			goto free;
 	}
 
+	node->lcore_id = RTE_MAX_LCORE;
 	node->id = node_id++;
 
 	/* Add the node at tail */
@@ -192,6 +193,30 @@ rte_node_clone(rte_node_t id, const char *name)
 	return RTE_NODE_ID_INVALID;
 }
 
+int
+rte_node_set_lcore_affinity(const char *name, unsigned int lcore_id)
+{
+	struct node *node;
+	int ret = -EINVAL;
+
+	if (lcore_id >= RTE_MAX_LCORE)
+		return ret;
+
+	graph_spinlock_lock();
+
+	STAILQ_FOREACH(node, &node_list, next) {
+		if (strncmp(node->name, name, RTE_NODE_NAMESIZE) == 0) {
+			node->lcore_id = lcore_id;
+			ret = 0;
+			break;
+		}
+	}
+
+	graph_spinlock_unlock();
+
+	return ret;
+}
+
 rte_node_t
 rte_node_from_name(const char *name)
 {
diff --git a/lib/graph/rte_graph.h b/lib/graph/rte_graph.h
index b32c4bc217..9f84461dd8 100644
--- a/lib/graph/rte_graph.h
+++ b/lib/graph/rte_graph.h
@@ -510,6 +510,21 @@ rte_node_t rte_node_from_name(const char *name);
 __rte_experimental
 char *rte_node_id_to_name(rte_node_t id);
 
+/**
+ * Set lcore affinity to the node.
+ *
+ * @param name
+ *   Valid node name. In the case of the cloned node, the name will be
+ * "parent node name" + "-" + name.
+ * @param lcore_id
+ *   The lcore ID value.
+ *
+ * @return
+ *   0 on success, error otherwise.
+ */
+__rte_experimental
+int rte_node_set_lcore_affinity(const char *name, unsigned int lcore_id);
+
 /**
  * Get the number of edges(next-nodes) for a node from node id.
  *
diff --git a/lib/graph/version.map b/lib/graph/version.map
index 13b838752d..6d40a74731 100644
--- a/lib/graph/version.map
+++ b/lib/graph/version.map
@@ -42,6 +42,7 @@ EXPERIMENTAL {
 	rte_node_next_stream_get;
 	rte_node_next_stream_put;
 	rte_node_next_stream_move;
+	rte_node_set_lcore_affinity;
 
 	local: *;
 };
-- 
2.25.1