[v5,20/21] pdcp: allocate reorder buffer alongside with entity

diff --git a/lib/pdcp/pdcp_cnt.c b/lib/pdcp/pdcp_cnt.c
index af027b00d3..e1d0634b4d 100644
--- a/lib/pdcp/pdcp_cnt.c
+++ b/lib/pdcp/pdcp_cnt.c
@@ -20,15 +20,14 @@  pdcp_cnt_bitmap_get_memory_footprint(const struct rte_pdcp_entity_conf *conf)
 }
 
 int
-pdcp_cnt_bitmap_create(struct entity_priv_dl_part *dl, void *bitmap_mem, uint32_t window_size)
+pdcp_cnt_bitmap_create(struct entity_priv_dl_part *dl, uint32_t nb_elem,
+		       void *bitmap_mem, uint32_t mem_size)
 {
-	uint32_t mem_size = rte_bitmap_get_memory_footprint(window_size);
-
-	dl->bitmap.bmp = rte_bitmap_init(window_size, bitmap_mem, mem_size);
+	dl->bitmap.bmp = rte_bitmap_init(nb_elem, bitmap_mem, mem_size);
 	if (dl->bitmap.bmp == NULL)
 		return -EINVAL;
 
-	dl->bitmap.size = window_size;
+	dl->bitmap.size = nb_elem;
 
 	return 0;
 }
diff --git a/lib/pdcp/pdcp_cnt.h b/lib/pdcp/pdcp_cnt.h
index 5941b7a406..87b011f9dc 100644
--- a/lib/pdcp/pdcp_cnt.h
+++ b/lib/pdcp/pdcp_cnt.h
@@ -10,7 +10,8 @@ 
 #include "pdcp_entity.h"
 
 uint32_t pdcp_cnt_bitmap_get_memory_footprint(const struct rte_pdcp_entity_conf *conf);
-int pdcp_cnt_bitmap_create(struct entity_priv_dl_part *dl, void *bitmap_mem, uint32_t window_size);
+int pdcp_cnt_bitmap_create(struct entity_priv_dl_part *dl, uint32_t nb_elem,
+			   void *bitmap_mem, uint32_t mem_size);
 
 void pdcp_cnt_bitmap_set(struct pdcp_cnt_bitmap bitmap, uint32_t count);
 bool pdcp_cnt_bitmap_is_set(struct pdcp_cnt_bitmap bitmap, uint32_t count);
diff --git a/lib/pdcp/pdcp_entity.h b/lib/pdcp/pdcp_entity.h
index a9b1428c7a..9f74b5d0e5 100644
--- a/lib/pdcp/pdcp_entity.h
+++ b/lib/pdcp/pdcp_entity.h
@@ -132,7 +132,7 @@  struct pdcp_cnt_bitmap {
 };
 
 /*
- * Layout of PDCP entity: [rte_pdcp_entity] [entity_priv] [entity_dl/ul]
+ * Layout of PDCP entity: [rte_pdcp_entity] [entity_priv] [entity_dl/ul] [reorder/bitmap]
  */
 
 struct entity_priv {
diff --git a/lib/pdcp/pdcp_reorder.c b/lib/pdcp/pdcp_reorder.c
index 5399f0dc28..bc45f2e19b 100644
--- a/lib/pdcp/pdcp_reorder.c
+++ b/lib/pdcp/pdcp_reorder.c
@@ -8,20 +8,13 @@ 
 #include "pdcp_reorder.h"
 
 int
-pdcp_reorder_create(struct pdcp_reorder *reorder, uint32_t window_size)
+pdcp_reorder_create(struct pdcp_reorder *reorder, size_t nb_elem, void *mem, size_t mem_size)
 {
-	reorder->buf = rte_reorder_create("reorder_buffer", SOCKET_ID_ANY, window_size);
+	reorder->buf = rte_reorder_init(mem, mem_size, "reorder_buffer", nb_elem);
 	if (reorder->buf == NULL)
 		return -rte_errno;
 
-	reorder->window_size = window_size;
 	reorder->is_active = false;
 
 	return 0;
 }
-
-void
-pdcp_reorder_destroy(const struct pdcp_reorder *reorder)
-{
-	rte_reorder_free(reorder->buf);
-}
diff --git a/lib/pdcp/pdcp_reorder.h b/lib/pdcp/pdcp_reorder.h
index 6a2f61d6ae..7e4f079d4b 100644
--- a/lib/pdcp/pdcp_reorder.h
+++ b/lib/pdcp/pdcp_reorder.h
@@ -9,12 +9,18 @@ 
 
 struct pdcp_reorder {
 	struct rte_reorder_buffer *buf;
-	uint32_t window_size;
 	bool is_active;
 };
 
-int pdcp_reorder_create(struct pdcp_reorder *reorder, uint32_t window_size);
-void pdcp_reorder_destroy(const struct pdcp_reorder *reorder);
+int pdcp_reorder_create(struct pdcp_reorder *reorder, size_t nb_elem, void *mem, size_t mem_size);
+
+/* NOTE: replace with `rte_reorder_memory_footprint_get` after DPDK 23.07 */
+#define SIZE_OF_REORDER_BUFFER (4 * RTE_CACHE_LINE_SIZE)
+static inline size_t
+pdcp_reorder_memory_footprint_get(size_t nb_elem)
+{
+	return SIZE_OF_REORDER_BUFFER + (2 * nb_elem * sizeof(struct rte_mbuf *));
+}
 
 static inline uint32_t
 pdcp_reorder_get_sequential(struct pdcp_reorder *reorder, struct rte_mbuf **mbufs,
diff --git a/lib/pdcp/rte_pdcp.c b/lib/pdcp/rte_pdcp.c
index 9865c620b7..1c6d2466b2 100644
--- a/lib/pdcp/rte_pdcp.c
+++ b/lib/pdcp/rte_pdcp.c
@@ -14,7 +14,15 @@ 
 
 #define RTE_PDCP_DYNFIELD_NAME "rte_pdcp_dynfield"
 
-static int bitmap_mem_offset;
+struct entity_layout {
+	size_t bitmap_offset;
+	size_t bitmap_size;
+
+	size_t reorder_buf_offset;
+	size_t reorder_buf_size;
+
+	size_t total_size;
+};
 
 int rte_pdcp_dynfield_offset = -1;
 
@@ -35,46 +43,54 @@  pdcp_dynfield_register(void)
 }
 
 static int
-pdcp_entity_size_get(const struct rte_pdcp_entity_conf *conf)
+pdcp_entity_layout_get(const struct rte_pdcp_entity_conf *conf, struct entity_layout *layout)
 {
-	int size;
+	size_t size;
+	const uint32_t window_size = pdcp_window_size_get(conf->pdcp_xfrm.sn_size);
 
 	size = sizeof(struct rte_pdcp_entity) + sizeof(struct entity_priv);
 
 	if (conf->pdcp_xfrm.pkt_dir == RTE_SECURITY_PDCP_DOWNLINK) {
 		size += sizeof(struct entity_priv_dl_part);
+		/* Bitmap require memory to be cache aligned */
 		size = RTE_CACHE_LINE_ROUNDUP(size);
-		bitmap_mem_offset = size;
-		size += pdcp_cnt_bitmap_get_memory_footprint(conf);
+		layout->bitmap_offset = size;
+		layout->bitmap_size = pdcp_cnt_bitmap_get_memory_footprint(conf);
+		size += layout->bitmap_size;
+		layout->reorder_buf_offset = size;
+		layout->reorder_buf_size = pdcp_reorder_memory_footprint_get(window_size);
+		size += layout->reorder_buf_size;
 	} else if (conf->pdcp_xfrm.pkt_dir == RTE_SECURITY_PDCP_UPLINK)
 		size += sizeof(struct entity_priv_ul_part);
 	else
 		return -EINVAL;
 
-	return RTE_ALIGN_CEIL(size, RTE_CACHE_LINE_SIZE);
+	layout->total_size = size;
+
+	return 0;
 }
 
 static int
-pdcp_dl_establish(struct rte_pdcp_entity *entity, const struct rte_pdcp_entity_conf *conf)
+pdcp_dl_establish(struct rte_pdcp_entity *entity, const struct rte_pdcp_entity_conf *conf,
+		  const struct entity_layout *layout)
 {
 	const uint32_t window_size = pdcp_window_size_get(conf->pdcp_xfrm.sn_size);
 	struct entity_priv_dl_part *dl = entity_dl_part_get(entity);
-	void *bitmap_mem;
+	void *memory;
 	int ret;
 
 	entity->max_pkt_cache = RTE_MAX(entity->max_pkt_cache, window_size);
 	dl->t_reorder.handle = conf->t_reordering;
 
-	ret = pdcp_reorder_create(&dl->reorder, window_size);
+	memory = RTE_PTR_ADD(entity, layout->reorder_buf_offset);
+	ret = pdcp_reorder_create(&dl->reorder, window_size, memory, layout->reorder_buf_size);
 	if (ret)
 		return ret;
 
-	bitmap_mem = RTE_PTR_ADD(entity, bitmap_mem_offset);
-	ret = pdcp_cnt_bitmap_create(dl, bitmap_mem, window_size);
-	if (ret) {
-		pdcp_reorder_destroy(&dl->reorder);
+	memory = RTE_PTR_ADD(entity, layout->bitmap_offset);
+	ret = pdcp_cnt_bitmap_create(dl, window_size, memory, layout->bitmap_size);
+	if (ret)
 		return ret;
-	}
 
 	return 0;
 }
@@ -82,10 +98,11 @@  pdcp_dl_establish(struct rte_pdcp_entity *entity, const struct rte_pdcp_entity_c
 struct rte_pdcp_entity *
 rte_pdcp_entity_establish(const struct rte_pdcp_entity_conf *conf)
 {
+	struct entity_layout entity_layout = { 0 };
 	struct rte_pdcp_entity *entity = NULL;
 	struct entity_priv *en_priv;
-	int ret, entity_size;
 	uint32_t count;
+	int ret;
 
 	if (pdcp_dynfield_register() < 0)
 		return NULL;
@@ -118,13 +135,14 @@  rte_pdcp_entity_establish(const struct rte_pdcp_entity_conf *conf)
 		return NULL;
 	}
 
-	entity_size = pdcp_entity_size_get(conf);
-	if (entity_size < 0) {
+	ret = pdcp_entity_layout_get(conf, &entity_layout);
+	if (ret < 0) {
 		rte_errno = EINVAL;
 		return NULL;
 	}
 
-	entity = rte_zmalloc_socket("pdcp_entity", entity_size, RTE_CACHE_LINE_SIZE, SOCKET_ID_ANY);
+	entity = rte_zmalloc_socket("pdcp_entity", entity_layout.total_size, RTE_CACHE_LINE_SIZE,
+				    SOCKET_ID_ANY);
 	if (entity == NULL) {
 		rte_errno = ENOMEM;
 		return NULL;
@@ -149,7 +167,7 @@  rte_pdcp_entity_establish(const struct rte_pdcp_entity_conf *conf)
 		goto crypto_sess_destroy;
 
 	if (conf->pdcp_xfrm.pkt_dir == RTE_SECURITY_PDCP_DOWNLINK) {
-		ret = pdcp_dl_establish(entity, conf);
+		ret = pdcp_dl_establish(entity, conf, &entity_layout);
 		if (ret)
 			goto crypto_sess_destroy;
 	}
@@ -174,8 +192,6 @@  pdcp_dl_release(struct rte_pdcp_entity *entity, struct rte_mbuf *out_mb[])
 	nb_out = pdcp_reorder_up_to_get(&dl->reorder, out_mb, entity->max_pkt_cache,
 			en_priv->state.rx_next);
 
-	pdcp_reorder_destroy(&dl->reorder);
-
 	return nb_out;
 }