[dpdk-dev] [PATCH 4/8] reorder: switch sequence number to dynamic mbuf field

[David Marchand <david.marchand@redhat.com>]

The reorder library used sequence numbers stored in the deprecated field
seqn.
It is moved to a dynamic mbuf field in order to allow removal of seqn.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 app/test/test_reorder.c          |  8 ++++----
 examples/packet_ordering/main.c  |  2 +-
 lib/librte_reorder/rte_reorder.c | 23 ++++++++++++++++++++---
 lib/librte_reorder/rte_reorder.h | 21 +++++++++++++++++++++
 lib/librte_reorder/version.map   |  6 ++++++
 5 files changed, 52 insertions(+), 8 deletions(-)

diff --git a/app/test/test_reorder.c b/app/test/test_reorder.c
index 58fa9c71b5..1c4226da65 100644
--- a/app/test/test_reorder.c
+++ b/app/test/test_reorder.c
@@ -149,7 +149,7 @@ test_reorder_insert(void)
 	for (i = 0; i < num_bufs; i++) {
 		bufs[i] = rte_pktmbuf_alloc(p);
 		TEST_ASSERT_NOT_NULL(bufs[i], "Packet allocation failed\n");
-		bufs[i]->seqn = i;
+		*rte_reorder_seqn(bufs[i]) = i;
 	}
 
 	/* This should fill up order buffer:
@@ -183,7 +183,7 @@ test_reorder_insert(void)
 	bufs[4] = NULL;
 
 	/* early packet from current sequence window - full ready buffer */
-	bufs[5]->seqn = 2 * size;
+	*rte_reorder_seqn(bufs[5]) = 2 * size;
 	ret = rte_reorder_insert(b, bufs[5]);
 	if (!((ret == -1) && (rte_errno == ENOSPC))) {
 		printf("%s:%d: No error inserting early packet with full ready buffer\n",
@@ -194,7 +194,7 @@ test_reorder_insert(void)
 	bufs[5] = NULL;
 
 	/* late packet */
-	bufs[6]->seqn = 3 * size;
+	*rte_reorder_seqn(bufs[6]) = 3 * size;
 	ret = rte_reorder_insert(b, bufs[6]);
 	if (!((ret == -1) && (rte_errno == ERANGE))) {
 		printf("%s:%d: No error inserting late packet with seqn:"
@@ -250,7 +250,7 @@ test_reorder_drain(void)
 	for (i = 0; i < num_bufs; i++) {
 		bufs[i] = rte_pktmbuf_alloc(p);
 		TEST_ASSERT_NOT_NULL(bufs[i], "Packet allocation failed\n");
-		bufs[i]->seqn = i;
+		*rte_reorder_seqn(bufs[i]) = i;
 	}
 
 	/* Insert packet with seqn 1:
diff --git a/examples/packet_ordering/main.c b/examples/packet_ordering/main.c
index a79d77a321..4bea1982d5 100644
--- a/examples/packet_ordering/main.c
+++ b/examples/packet_ordering/main.c
@@ -451,7 +451,7 @@ rx_thread(struct rte_ring *ring_out)
 
 				/* mark sequence number */
 				for (i = 0; i < nb_rx_pkts; )
-					pkts[i++]->seqn = seqn++;
+					*rte_reorder_seqn(pkts[i++]) = seqn++;
 
 				/* enqueue to rx_to_workers ring */
 				ret = rte_ring_enqueue_burst(ring_out,
diff --git a/lib/librte_reorder/rte_reorder.c b/lib/librte_reorder/rte_reorder.c
index 3c9f0e2d08..9445853b79 100644
--- a/lib/librte_reorder/rte_reorder.c
+++ b/lib/librte_reorder/rte_reorder.c
@@ -8,6 +8,7 @@
 #include <rte_string_fns.h>
 #include <rte_log.h>
 #include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
 #include <rte_eal_memconfig.h>
 #include <rte_errno.h>
 #include <rte_malloc.h>
@@ -29,6 +30,9 @@ EAL_REGISTER_TAILQ(rte_reorder_tailq)
 /* Macros for printing using RTE_LOG */
 #define RTE_LOGTYPE_REORDER	RTE_LOGTYPE_USER1
 
+#define RTE_REORDER_SEQN_DYNFIELD_NAME "rte_reorder_seqn_dynfield"
+int rte_reorder_seqn_dynfield_offset = -1;
+
 /* A generic circular buffer */
 struct cir_buffer {
 	unsigned int size;   /**< Number of entries that can be stored */
@@ -103,6 +107,11 @@ rte_reorder_create(const char *name, unsigned socket_id, unsigned int size)
 	struct rte_reorder_list *reorder_list;
 	const unsigned int bufsize = sizeof(struct rte_reorder_buffer) +
 					(2 * size * sizeof(struct rte_mbuf *));
+	static const struct rte_mbuf_dynfield reorder_seqn_dynfield_desc = {
+		.name = RTE_REORDER_SEQN_DYNFIELD_NAME,
+		.size = sizeof(rte_reorder_seqn_t),
+		.align = __alignof__(rte_reorder_seqn_t),
+	};
 
 	reorder_list = RTE_TAILQ_CAST(rte_reorder_tailq.head, rte_reorder_list);
 
@@ -120,6 +129,14 @@ rte_reorder_create(const char *name, unsigned socket_id, unsigned int size)
 		return NULL;
 	}
 
+	rte_reorder_seqn_dynfield_offset =
+		rte_mbuf_dynfield_register(&reorder_seqn_dynfield_desc);
+	if (rte_reorder_seqn_dynfield_offset < 0) {
+		RTE_LOG(ERR, REORDER, "Failed to register mbuf field for reorder sequence number\n");
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
 	rte_mcfg_tailq_write_lock();
 
 	/* guarantee there's no existing */
@@ -310,7 +327,7 @@ rte_reorder_insert(struct rte_reorder_buffer *b, struct rte_mbuf *mbuf)
 
 	order_buf = &b->order_buf;
 	if (!b->is_initialized) {
-		b->min_seqn = mbuf->seqn;
+		b->min_seqn = *rte_reorder_seqn(mbuf);
 		b->is_initialized = 1;
 	}
 
@@ -322,7 +339,7 @@ rte_reorder_insert(struct rte_reorder_buffer *b, struct rte_mbuf *mbuf)
 	 *	mbuf_seqn = 0x0010
 	 *	offset    = 0x0010 - 0xFFFD = 0x13
 	 */
-	offset = mbuf->seqn - b->min_seqn;
+	offset = *rte_reorder_seqn(mbuf) - b->min_seqn;
 
 	/*
 	 * action to take depends on offset.
@@ -352,7 +369,7 @@ rte_reorder_insert(struct rte_reorder_buffer *b, struct rte_mbuf *mbuf)
 			rte_errno = ENOSPC;
 			return -1;
 		}
-		offset = mbuf->seqn - b->min_seqn;
+		offset = *rte_reorder_seqn(mbuf) - b->min_seqn;
 		position = (order_buf->head + offset) & order_buf->mask;
 		order_buf->entries[position] = mbuf;
 	} else {
diff --git a/lib/librte_reorder/rte_reorder.h b/lib/librte_reorder/rte_reorder.h
index 6d39710088..ce6cd598e9 100644
--- a/lib/librte_reorder/rte_reorder.h
+++ b/lib/librte_reorder/rte_reorder.h
@@ -16,6 +16,7 @@
  */
 
 #include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -23,6 +24,26 @@ extern "C" {
 
 struct rte_reorder_buffer;
 
+typedef uint32_t rte_reorder_seqn_t;
+extern int rte_reorder_seqn_dynfield_offset;
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Read reorder sequence number from mbuf.
+ *
+ * @param mbuf Structure to read from.
+ * @return pointer to reorder sequence number.
+ */
+__rte_experimental
+static inline rte_reorder_seqn_t *
+rte_reorder_seqn(const struct rte_mbuf *mbuf)
+{
+	return RTE_MBUF_DYNFIELD(mbuf, rte_reorder_seqn_dynfield_offset,
+		rte_reorder_seqn_t *);
+}
+
 /**
  * Create a new reorder buffer instance
  *
diff --git a/lib/librte_reorder/version.map b/lib/librte_reorder/version.map
index 8c0220d324..d902a7fa12 100644
--- a/lib/librte_reorder/version.map
+++ b/lib/librte_reorder/version.map
@@ -11,3 +11,9 @@ DPDK_21 {
 
 	local: *;
 };
+
+EXPERIMENTAL {
+	global:
+
+	rte_reorder_seqn_dynfield_offset;
+};
-- 
2.23.0