[PATCH v1 05/13] graph: introduce core affinity API

[Zhirun Yan]

1. add lcore_id for node to hold affinity core id.
2. impl rte_node_model_generic_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/meson.build               |  1 +
 lib/graph/node.c                    |  1 +
 lib/graph/rte_graph_model_generic.c | 31 +++++++++++++++++++++
 lib/graph/rte_graph_model_generic.h | 43 +++++++++++++++++++++++++++++
 lib/graph/version.map               |  2 ++
 6 files changed, 79 insertions(+)
 create mode 100644 lib/graph/rte_graph_model_generic.c
 create mode 100644 lib/graph/rte_graph_model_generic.h

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/meson.build b/lib/graph/meson.build
index c7327549e8..8c8b11ed27 100644
--- a/lib/graph/meson.build
+++ b/lib/graph/meson.build
@@ -14,6 +14,7 @@ sources = files(
         'graph_debug.c',
         'graph_stats.c',
         'graph_populate.c',
+        'rte_graph_model_generic.c',
 )
 headers = files('rte_graph.h', 'rte_graph_worker.h')
 
diff --git a/lib/graph/node.c b/lib/graph/node.c
index fc6345de07..8ad4b3cbeb 100644
--- a/lib/graph/node.c
+++ b/lib/graph/node.c
@@ -100,6 +100,7 @@ __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 */
diff --git a/lib/graph/rte_graph_model_generic.c b/lib/graph/rte_graph_model_generic.c
new file mode 100644
index 0000000000..54ff659c7b
--- /dev/null
+++ b/lib/graph/rte_graph_model_generic.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2022 Intel Corporation
+ */
+
+#include "graph_private.h"
+#include "rte_graph_model_generic.h"
+
+int
+rte_node_model_generic_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_head_get(), next) {
+		if (strncmp(node->name, name, RTE_NODE_NAMESIZE) == 0) {
+			node->lcore_id = lcore_id;
+			ret = 0;
+			break;
+		}
+	}
+
+	graph_spinlock_unlock();
+
+	return ret;
+}
+
diff --git a/lib/graph/rte_graph_model_generic.h b/lib/graph/rte_graph_model_generic.h
new file mode 100644
index 0000000000..20ca48a9e3
--- /dev/null
+++ b/lib/graph/rte_graph_model_generic.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2022 Intel Corporation
+ */
+
+#ifndef _RTE_GRAPH_MODEL_GENERIC_H_
+#define _RTE_GRAPH_MODEL_GENERIC_H_
+
+/**
+ * @file rte_graph_model_generic.h
+ *
+ * @warning
+ * @b EXPERIMENTAL:
+ * All functions in this file may be changed or removed without prior notice.
+ *
+ * This API allows a worker thread to walk over a graph and nodes to create,
+ * process, enqueue and move streams of objects to the next nodes.
+ */
+#include "rte_graph_worker_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * 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_model_generic_set_lcore_affinity(const char *name, unsigned int lcore_id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_GRAPH_MODEL_GENERIC_H_ */
diff --git a/lib/graph/version.map b/lib/graph/version.map
index eea73ec9ca..33ff055be6 100644
--- a/lib/graph/version.map
+++ b/lib/graph/version.map
@@ -46,5 +46,7 @@ EXPERIMENTAL {
 	rte_graph_worker_model_set;
 	rte_graph_worker_model_get;
 
+	rte_node_model_generic_set_lcore_affinity;
+
 	local: *;
 };
-- 
2.25.1