[dpdk-dev] [PATCH v3 04/15] node: switch IPv4 metadata to dynamic mbuf field

[Thomas Monjalon <thomas@monjalon.net>]

The node_mbuf_priv1 was stored in the deprecated mbuf field udata64.
It is moved to a dynamic field in order to allow removal of udata64.

WARNING: this change should be replaced with another solution
proposed by Nithin. Waiting for the patch to be integrated.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 lib/librte_node/ip4_lookup.c   |  7 +++++++
 lib/librte_node/ip4_rewrite.c  | 10 ++++++++++
 lib/librte_node/node_private.h | 12 ++++++++++--
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/lib/librte_node/ip4_lookup.c b/lib/librte_node/ip4_lookup.c
index 8835aab9dd..3bd7c179ab 100644
--- a/lib/librte_node/ip4_lookup.c
+++ b/lib/librte_node/ip4_lookup.c
@@ -21,6 +21,8 @@
 
 #include "node_private.h"
 
+int node_mbuf_priv1_dynfield_offset = -1;
+
 #define IPV4_L3FWD_LPM_MAX_RULES 1024
 #define IPV4_L3FWD_LPM_NUMBER_TBL8S (1 << 8)
 
@@ -178,6 +180,11 @@ ip4_lookup_node_init(const struct rte_graph *graph, struct rte_node *node)
 	RTE_SET_USED(node);
 
 	if (!init_once) {
+		node_mbuf_priv1_dynfield_offset = rte_mbuf_dynfield_register(
+				&node_mbuf_priv1_dynfield_desc);
+		if (node_mbuf_priv1_dynfield_offset < 0)
+			return -rte_errno;
+
 		/* Setup LPM tables for all sockets */
 		RTE_LCORE_FOREACH(lcore_id)
 		{
diff --git a/lib/librte_node/ip4_rewrite.c b/lib/librte_node/ip4_rewrite.c
index bb7f671b5c..1c4e51968c 100644
--- a/lib/librte_node/ip4_rewrite.c
+++ b/lib/librte_node/ip4_rewrite.c
@@ -248,9 +248,19 @@ ip4_rewrite_node_process(struct rte_graph *graph, struct rte_node *node,
 static int
 ip4_rewrite_node_init(const struct rte_graph *graph, struct rte_node *node)
 {
+	static bool init_once;
 
 	RTE_SET_USED(graph);
 	RTE_SET_USED(node);
+
+	if (!init_once) {
+		node_mbuf_priv1_dynfield_offset = rte_mbuf_dynfield_register(
+				&node_mbuf_priv1_dynfield_desc);
+		if (node_mbuf_priv1_dynfield_offset < 0)
+			return -rte_errno;
+		init_once = true;
+	}
+
 	node_dbg("ip4_rewrite", "Initialized ip4_rewrite node initialized");
 
 	return 0;
diff --git a/lib/librte_node/node_private.h b/lib/librte_node/node_private.h
index ab7941c12b..9258082df0 100644
--- a/lib/librte_node/node_private.h
+++ b/lib/librte_node/node_private.h
@@ -8,6 +8,7 @@
 #include <rte_common.h>
 #include <rte_log.h>
 #include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
 
 extern int rte_node_logtype;
 #define NODE_LOG(level, node_name, ...)                                        \
@@ -21,7 +22,6 @@ extern int rte_node_logtype;
 #define node_dbg(node_name, ...) NODE_LOG(DEBUG, node_name, __VA_ARGS__)
 
 /**
- *
  * Node mbuf private data to store next hop, ttl and checksum.
  */
 struct node_mbuf_priv1 {
@@ -37,6 +37,13 @@ struct node_mbuf_priv1 {
 	};
 };
 
+static const struct rte_mbuf_dynfield node_mbuf_priv1_dynfield_desc = {
+	.name = "rte_node_dynfield_priv1",
+	.size = sizeof(struct node_mbuf_priv1),
+	.align = __alignof__(struct node_mbuf_priv1),
+};
+extern int node_mbuf_priv1_dynfield_offset;
+
 /**
  * Node mbuf private area 2.
  */
@@ -60,7 +67,8 @@ struct node_mbuf_priv2 {
 static __rte_always_inline struct node_mbuf_priv1 *
 node_mbuf_priv1(struct rte_mbuf *m)
 {
-	return (struct node_mbuf_priv1 *)&m->udata64;
+	return RTE_MBUF_DYNFIELD(m,
+		node_mbuf_priv1_dynfield_offset, struct node_mbuf_priv1 *);
 }
 
 /**
-- 
2.28.0