X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_mempool%2Frte_mempool.h;h=bdb217b3b7d9c07e54fbeb34856258b6550afb00;hb=3d7e7f026efe919b95a4f860e687b72919e7ae60;hp=a8054e139e840dcab55c95a37729f36fe72d5a81;hpb=00e481412a4c48412dc03a0b63fcf0c3dd3085f3;p=dpdk.git

diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
index a8054e139e..bdb217b3b7 100644
--- a/lib/librte_mempool/rte_mempool.h
+++ b/lib/librte_mempool/rte_mempool.h
@@ -2,6 +2,7 @@
  *   BSD LICENSE
  *
  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2016 6WIND S.A.
  *   All rights reserved.
  *
  *   Redistribution and use in source and binary forms, with or without
@@ -95,7 +96,6 @@ struct rte_mempool_debug_stats {
 } __rte_cache_aligned;
 #endif
 
-#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
 /**
  * A structure that stores a per-core object cache.
  */
@@ -107,7 +107,6 @@ struct rte_mempool_cache {
 	 */
 	void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
 } __rte_cache_aligned;
-#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
 
 /**
  * A structure that stores the size of mempool elements.
@@ -142,21 +141,34 @@ struct rte_mempool_objsz {
 /** Mempool over one chunk of physically continuous memory */
 #define	MEMPOOL_PG_NUM_DEFAULT	1
 
+#ifndef RTE_MEMPOOL_ALIGN
+#define RTE_MEMPOOL_ALIGN	RTE_CACHE_LINE_SIZE
+#endif
+
+#define RTE_MEMPOOL_ALIGN_MASK	(RTE_MEMPOOL_ALIGN - 1)
+
 /**
  * Mempool object header structure
  *
  * Each object stored in mempools are prefixed by this header structure,
- * it allows to retrieve the mempool pointer from the object. When debug
- * is enabled, a cookie is also added in this structure preventing
- * corruptions and double-frees.
+ * it allows to retrieve the mempool pointer from the object and to
+ * iterate on all objects attached to a mempool. When debug is enabled,
+ * a cookie is also added in this structure preventing corruptions and
+ * double-frees.
  */
 struct rte_mempool_objhdr {
+	STAILQ_ENTRY(rte_mempool_objhdr) next; /**< Next in list. */
 	struct rte_mempool *mp;          /**< The mempool owning the object. */
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
 	uint64_t cookie;                 /**< Debug cookie. */
 #endif
 };
 
+/**
+ * A list of object headers type
+ */
+STAILQ_HEAD(rte_mempool_objhdr_list, rte_mempool_objhdr);
+
 /**
  * Mempool object trailer structure
  *
@@ -188,10 +200,9 @@ struct rte_mempool {
 
 	unsigned private_data_size;      /**< Size of private data. */
 
-#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
-	/** Per-lcore local cache. */
-	struct rte_mempool_cache local_cache[RTE_MAX_LCORE];
-#endif
+	struct rte_mempool_cache *local_cache; /**< Per-lcore local cache */
+
+	struct rte_mempool_objhdr_list elt_list; /**< List of objects in pool */
 
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
 	/** Per-lcore statistics. */
@@ -213,7 +224,7 @@ struct rte_mempool {
 
 }  __rte_cache_aligned;
 
-#define MEMPOOL_F_NO_SPREAD      0x0001 /**< Do not spread in memory. */
+#define MEMPOOL_F_NO_SPREAD      0x0001 /**< Do not spread among memory channels. */
 #define MEMPOOL_F_NO_CACHE_ALIGN 0x0002 /**< Do not align objs on cache lines.*/
 #define MEMPOOL_F_SP_PUT         0x0004 /**< Default put is "single-producer".*/
 #define MEMPOOL_F_SC_GET         0x0008 /**< Default get is "single-consumer".*/
@@ -240,6 +251,13 @@ struct rte_mempool {
 #define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
 #endif
 
+/**
+ * Size of elt_pa array size based on number of pages. (Internal use)
+ */
+#define __PA_SIZE(mp, pgn) \
+	RTE_ALIGN_CEIL((((pgn) - RTE_DIM((mp)->elt_pa)) * \
+	sizeof((mp)->elt_pa[0])), RTE_CACHE_LINE_SIZE)
+
 /**
  * Calculate the size of the mempool header.
  *
@@ -247,10 +265,12 @@ struct rte_mempool {
  *   Pointer to the memory pool.
  * @param pgn
  *   Number of pages used to store mempool objects.
+ * @param cs
+ *   Size of the per-lcore cache.
  */
-#define	MEMPOOL_HEADER_SIZE(mp, pgn)	(sizeof(*(mp)) + \
-	RTE_ALIGN_CEIL(((pgn) - RTE_DIM((mp)->elt_pa)) * \
-	sizeof ((mp)->elt_pa[0]), RTE_CACHE_LINE_SIZE))
+#define MEMPOOL_HEADER_SIZE(mp, pgn, cs) \
+	(sizeof(*(mp)) + __PA_SIZE(mp, pgn) + (((cs) == 0) ? 0 : \
+	(sizeof(struct rte_mempool_cache) * RTE_MAX_LCORE)))
 
 /**
  * Return true if the whole mempool is in contiguous memory.
@@ -262,17 +282,10 @@ struct rte_mempool {
 /* return the header of a mempool object (internal) */
 static inline struct rte_mempool_objhdr *__mempool_get_header(void *obj)
 {
-	return (struct rte_mempool_objhdr *)((char *)obj -
+	return (struct rte_mempool_objhdr *)RTE_PTR_SUB(obj,
 		sizeof(struct rte_mempool_objhdr));
 }
 
-/* return the trailer of a mempool object (internal) */
-static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
-{
-	return (struct rte_mempool_objtlr *)((char *)obj -
-		sizeof(struct rte_mempool_objtlr));
-}
-
 /**
  * Return a pointer to the mempool owning this object.
  *
@@ -288,6 +301,13 @@ static inline struct rte_mempool *rte_mempool_from_obj(void *obj)
 	return hdr->mp;
 }
 
+/* return the trailer of a mempool object (internal) */
+static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
+{
+	struct rte_mempool *mp = rte_mempool_from_obj(obj);
+	return (struct rte_mempool_objtlr *)RTE_PTR_ADD(obj, mp->elt_size);
+}
+
 /**
  * @internal Check and update cookies or panic.
  *
@@ -302,140 +322,24 @@ static inline struct rte_mempool *rte_mempool_from_obj(void *obj)
  *   - 1: object is supposed to be free, mark it as allocated
  *   - 2: just check that cookie is valid (free or allocated)
  */
+void rte_mempool_check_cookies(const struct rte_mempool *mp,
+	void * const *obj_table_const, unsigned n, int free);
+
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
-#ifndef __INTEL_COMPILER
-#pragma GCC diagnostic ignored "-Wcast-qual"
-#endif
-static inline void __mempool_check_cookies(const struct rte_mempool *mp,
-					   void * const *obj_table_const,
-					   unsigned n, int free)
-{
-	struct rte_mempool_objhdr *hdr;
-	struct rte_mempool_objtlr *tlr;
-	uint64_t cookie;
-	void *tmp;
-	void *obj;
-	void **obj_table;
-
-	/* Force to drop the "const" attribute. This is done only when
-	 * DEBUG is enabled */
-	tmp = (void *) obj_table_const;
-	obj_table = (void **) tmp;
-
-	while (n--) {
-		obj = obj_table[n];
-
-		if (rte_mempool_from_obj(obj) != mp)
-			rte_panic("MEMPOOL: object is owned by another "
-				  "mempool\n");
-
-		hdr = __mempool_get_header(obj);
-		cookie = hdr->cookie;
-
-		if (free == 0) {
-			if (cookie != RTE_MEMPOOL_HEADER_COOKIE1) {
-				rte_log_set_history(0);
-				RTE_LOG(CRIT, MEMPOOL,
-					"obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
-					obj, (const void *) mp, cookie);
-				rte_panic("MEMPOOL: bad header cookie (put)\n");
-			}
-			hdr->cookie = RTE_MEMPOOL_HEADER_COOKIE2;
-		}
-		else if (free == 1) {
-			if (cookie != RTE_MEMPOOL_HEADER_COOKIE2) {
-				rte_log_set_history(0);
-				RTE_LOG(CRIT, MEMPOOL,
-					"obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
-					obj, (const void *) mp, cookie);
-				rte_panic("MEMPOOL: bad header cookie (get)\n");
-			}
-			hdr->cookie = RTE_MEMPOOL_HEADER_COOKIE1;
-		}
-		else if (free == 2) {
-			if (cookie != RTE_MEMPOOL_HEADER_COOKIE1 &&
-			    cookie != RTE_MEMPOOL_HEADER_COOKIE2) {
-				rte_log_set_history(0);
-				RTE_LOG(CRIT, MEMPOOL,
-					"obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
-					obj, (const void *) mp, cookie);
-				rte_panic("MEMPOOL: bad header cookie (audit)\n");
-			}
-		}
-		tlr = __mempool_get_trailer(obj);
-		cookie = tlr->cookie;
-		if (cookie != RTE_MEMPOOL_TRAILER_COOKIE) {
-			rte_log_set_history(0);
-			RTE_LOG(CRIT, MEMPOOL,
-				"obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
-				obj, (const void *) mp, cookie);
-			rte_panic("MEMPOOL: bad trailer cookie\n");
-		}
-	}
-}
-#ifndef __INTEL_COMPILER
-#pragma GCC diagnostic error "-Wcast-qual"
-#endif
+#define __mempool_check_cookies(mp, obj_table_const, n, free) \
+	rte_mempool_check_cookies(mp, obj_table_const, n, free)
 #else
 #define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0)
 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
 
 /**
- * A mempool object iterator callback function.
- */
-typedef void (*rte_mempool_obj_iter_t)(void * /*obj_iter_arg*/,
-	void * /*obj_start*/,
-	void * /*obj_end*/,
-	uint32_t /*obj_index */);
-
-/**
- * Call a function for each mempool object in a memory chunk
- *
- * Iterate across objects of the given size and alignment in the
- * provided chunk of memory. The given memory buffer can consist of
- * disjoint physical pages.
+ * An object callback function for mempool.
  *
- * For each object, calls the provided callback (if any). This function
- * is used to populate mempool, walk through all elements of the
- * mempool, estimate how many elements of the given size could be
- * created in the given memory buffer.
- *
- * @param vaddr
- *   Virtual address of the memory buffer.
- * @param elt_num
- *   Maximum number of objects to iterate through.
- * @param elt_sz
- *   Size of each object.
- * @param paddr
- *   Array of physical addresses of the pages that comprises given memory
- *   buffer.
- * @param pg_num
- *   Number of elements in the paddr array.
- * @param pg_shift
- *   LOG2 of the physical pages size.
- * @param obj_iter
- *   Object iterator callback function (could be NULL).
- * @param obj_iter_arg
- *   User defined parameter for the object iterator callback function.
- *
- * @return
- *   Number of objects iterated through.
+ * Used by rte_mempool_create() and rte_mempool_obj_iter().
  */
-
-uint32_t rte_mempool_obj_iter(void *vaddr,
-	uint32_t elt_num, size_t elt_sz, size_t align,
-	const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift,
-	rte_mempool_obj_iter_t obj_iter, void *obj_iter_arg);
-
-/**
- * An object constructor callback function for mempool.
- *
- * Arguments are the mempool, the opaque pointer given by the user in
- * rte_mempool_create(), the pointer to the element and the index of
- * the element in the pool.
- */
-typedef void (rte_mempool_obj_ctor_t)(struct rte_mempool *, void *,
-				      void *, unsigned);
+typedef void (rte_mempool_obj_cb_t)(struct rte_mempool *mp,
+		void *opaque, void *obj, unsigned obj_idx);
+typedef rte_mempool_obj_cb_t rte_mempool_obj_ctor_t; /* compat */
 
 /**
  * A mempool constructor callback function.
@@ -530,14 +434,15 @@ struct rte_mempool *
 rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
 		   unsigned cache_size, unsigned private_data_size,
 		   rte_mempool_ctor_t *mp_init, void *mp_init_arg,
-		   rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
+		   rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
 		   int socket_id, unsigned flags);
 
 /**
  * Create a new mempool named *name* in memory.
  *
- * This function uses ``memzone_reserve()`` to allocate memory. The
- * pool contains n elements of elt_size. Its size is set to n.
+ * The pool contains n elements of elt_size. Its size is set to n.
+ * This function uses ``memzone_reserve()`` to allocate the mempool header
+ * (and the objects if vaddr is NULL).
  * Depending on the input parameters, mempool elements can be either allocated
  * together with the mempool header, or an externally provided memory buffer
  * could be used to store mempool objects. In later case, that external
@@ -552,18 +457,7 @@ rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
  * @param elt_size
  *   The size of each element.
  * @param cache_size
- *   If cache_size is non-zero, the rte_mempool library will try to
- *   limit the accesses to the common lockless pool, by maintaining a
- *   per-lcore object cache. This argument must be lower or equal to
- *   CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE. It is advised to choose
- *   cache_size to have "n modulo cache_size == 0": if this is
- *   not the case, some elements will always stay in the pool and will
- *   never be used. The access to the per-lcore table is of course
- *   faster than the multi-producer/consumer pool. The cache can be
- *   disabled if the cache_size argument is set to 0; it can be useful to
- *   avoid losing objects in cache. Note that even if not used, the
- *   memory space for cache is always reserved in a mempool structure,
- *   except if CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE is set to 0.
+ *   Size of the cache. See rte_mempool_create() for details.
  * @param private_data_size
  *   The size of the private data appended after the mempool
  *   structure. This is useful for storing some private data after the
@@ -577,35 +471,17 @@ rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
  *   An opaque pointer to data that can be used in the mempool
  *   constructor function.
  * @param obj_init
- *   A function pointer that is called for each object at
- *   initialization of the pool. The user can set some meta data in
- *   objects if needed. This parameter can be NULL if not needed.
- *   The obj_init() function takes the mempool pointer, the init_arg,
- *   the object pointer and the object number as parameters.
+ *   A function called for each object at initialization of the pool.
+ *   See rte_mempool_create() for details.
  * @param obj_init_arg
- *   An opaque pointer to data that can be used as an argument for
- *   each call to the object constructor function.
+ *   An opaque pointer passed to the object constructor function.
  * @param socket_id
  *   The *socket_id* argument is the socket identifier in the case of
  *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
  *   constraint for the reserved zone.
  * @param flags
- *   The *flags* arguments is an OR of following flags:
- *   - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
- *     between channels in RAM: the pool allocator will add padding
- *     between objects depending on the hardware configuration. See
- *     Memory alignment constraints for details. If this flag is set,
- *     the allocator will just align them to a cache line.
- *   - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
- *     cache-aligned. This flag removes this constraint, and no
- *     padding will be present between objects. This flag implies
- *     MEMPOOL_F_NO_SPREAD.
- *   - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
- *     when using rte_mempool_put() or rte_mempool_put_bulk() is
- *     "single-producer". Otherwise, it is "multi-producers".
- *   - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
- *     when using rte_mempool_get() or rte_mempool_get_bulk() is
- *     "single-consumer". Otherwise, it is "multi-consumers".
+ *   Flags controlling the behavior of the mempool. See
+ *   rte_mempool_create() for details.
  * @param vaddr
  *   Virtual address of the externally allocated memory buffer.
  *   Will be used to store mempool objects.
@@ -618,23 +494,16 @@ rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
  *   LOG2 of the physical pages size.
  * @return
  *   The pointer to the new allocated mempool, on success. NULL on error
- *   with rte_errno set appropriately. Possible rte_errno values include:
- *    - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
- *    - E_RTE_SECONDARY - function was called from a secondary process instance
- *    - EINVAL - cache size provided is too large
- *    - ENOSPC - the maximum number of memzones has already been allocated
- *    - EEXIST - a memzone with the same name already exists
- *    - ENOMEM - no appropriate memory area found in which to create memzone
+ *   with rte_errno set appropriately. See rte_mempool_create() for details.
  */
 struct rte_mempool *
 rte_mempool_xmem_create(const char *name, unsigned n, unsigned elt_size,
 		unsigned cache_size, unsigned private_data_size,
 		rte_mempool_ctor_t *mp_init, void *mp_init_arg,
-		rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
+		rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
 		int socket_id, unsigned flags, void *vaddr,
 		const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift);
 
-#ifdef RTE_LIBRTE_XEN_DOM0
 /**
  * Create a new mempool named *name* in memory on Xen Dom0.
  *
@@ -720,9 +589,27 @@ struct rte_mempool *
 rte_dom0_mempool_create(const char *name, unsigned n, unsigned elt_size,
 		unsigned cache_size, unsigned private_data_size,
 		rte_mempool_ctor_t *mp_init, void *mp_init_arg,
-		rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
+		rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
 		int socket_id, unsigned flags);
-#endif
+
+
+/**
+ * Call a function for each mempool element
+ *
+ * Iterate across all objects attached to a rte_mempool and call the
+ * callback function on it.
+ *
+ * @param mp
+ *   A pointer to an initialized mempool.
+ * @param obj_cb
+ *   A function pointer that is called for each object.
+ * @param obj_cb_arg
+ *   An opaque pointer passed to the callback function.
+ * @return
+ *   Number of objects iterated.
+ */
+uint32_t rte_mempool_obj_iter(struct rte_mempool *mp,
+	rte_mempool_obj_cb_t *obj_cb, void *obj_cb_arg);
 
 /**
  * Dump the status of the mempool to the console.
@@ -732,7 +619,7 @@ rte_dom0_mempool_create(const char *name, unsigned n, unsigned elt_size,
  * @param mp
  *   A pointer to the mempool structure.
  */
-void rte_mempool_dump(FILE *f, const struct rte_mempool *mp);
+void rte_mempool_dump(FILE *f, struct rte_mempool *mp);
 
 /**
  * @internal Put several objects back in the mempool; used internally.
@@ -750,19 +637,16 @@ static inline void __attribute__((always_inline))
 __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
 		    unsigned n, int is_mp)
 {
-#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
 	struct rte_mempool_cache *cache;
 	uint32_t index;
 	void **cache_objs;
 	unsigned lcore_id = rte_lcore_id();
 	uint32_t cache_size = mp->cache_size;
 	uint32_t flushthresh = mp->cache_flushthresh;
-#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
 
 	/* increment stat now, adding in mempool always success */
 	__MEMPOOL_STAT_ADD(mp, put, n);
 
-#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
 	/* cache is not enabled or single producer or non-EAL thread */
 	if (unlikely(cache_size == 0 || is_mp == 0 ||
 		     lcore_id >= RTE_MAX_LCORE))
@@ -797,7 +681,6 @@ __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
 	return;
 
 ring_enqueue:
-#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
 
 	/* push remaining objects in ring */
 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
@@ -941,7 +824,6 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
 		   unsigned n, int is_mc)
 {
 	int ret;
-#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
 	struct rte_mempool_cache *cache;
 	uint32_t index, len;
 	void **cache_objs;
@@ -987,7 +869,6 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
 	return 0;
 
 ring_dequeue:
-#endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
 
 	/* get remaining objects from ring */
 	if (is_mc)
@@ -1255,7 +1136,7 @@ rte_mempool_virt2phy(const struct rte_mempool *mp, const void *elt)
 		uintptr_t off;
 
 		off = (const char *)elt - (const char *)mp->elt_va_start;
-		return (mp->elt_pa[off >> mp->pg_shift] + (off & mp->pg_mask));
+		return mp->elt_pa[off >> mp->pg_shift] + (off & mp->pg_mask);
 	} else {
 		/*
 		 * If huge pages are disabled, we cannot assume the
@@ -1276,7 +1157,7 @@ rte_mempool_virt2phy(const struct rte_mempool *mp, const void *elt)
  * @param mp
  *   A pointer to the mempool structure.
  */
-void rte_mempool_audit(const struct rte_mempool *mp);
+void rte_mempool_audit(struct rte_mempool *mp);
 
 /**
  * Return a pointer to the private data in an mempool structure.
@@ -1288,7 +1169,8 @@ void rte_mempool_audit(const struct rte_mempool *mp);
  */
 static inline void *rte_mempool_get_priv(struct rte_mempool *mp)
 {
-	return (char *)mp + MEMPOOL_HEADER_SIZE(mp, mp->pg_num);
+	return (char *)mp +
+		MEMPOOL_HEADER_SIZE(mp, mp->pg_num, mp->cache_size);
 }
 
 /**
@@ -1320,7 +1202,7 @@ struct rte_mempool *rte_mempool_lookup(const char *name);
  * calculates header, trailer, body and total sizes of the mempool object.
  *
  * @param elt_size
- *   The size of each element.
+ *   The size of each element, without header and trailer.
  * @param flags
  *   The flags used for the mempool creation.
  *   Consult rte_mempool_create() for more information about possible values.
@@ -1346,14 +1228,15 @@ uint32_t rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
  *
  * @param elt_num
  *   Number of elements.
- * @param elt_sz
- *   The size of each element.
+ * @param total_elt_sz
+ *   The size of each element, including header and trailer, as returned
+ *   by rte_mempool_calc_obj_size().
  * @param pg_shift
  *   LOG2 of the physical pages size.
  * @return
  *   Required memory size aligned at page boundary.
  */
-size_t rte_mempool_xmem_size(uint32_t elt_num, size_t elt_sz,
+size_t rte_mempool_xmem_size(uint32_t elt_num, size_t total_elt_sz,
 	uint32_t pg_shift);
 
 /**
@@ -1367,8 +1250,9 @@ size_t rte_mempool_xmem_size(uint32_t elt_num, size_t elt_sz,
  *   Will be used to store mempool objects.
  * @param elt_num
  *   Number of elements.
- * @param elt_sz
- *   The size of each element.
+ * @param total_elt_sz
+ *   The size of each element, including header and trailer, as returned
+ *   by rte_mempool_calc_obj_size().
  * @param paddr
  *   Array of physical addresses of the pages that comprises given memory
  *   buffer.
@@ -1382,8 +1266,9 @@ size_t rte_mempool_xmem_size(uint32_t elt_num, size_t elt_sz,
  *   buffer is too small, return a negative value whose absolute value
  *   is the actual number of elements that can be stored in that buffer.
  */
-ssize_t rte_mempool_xmem_usage(void *vaddr, uint32_t elt_num, size_t elt_sz,
-	const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift);
+ssize_t rte_mempool_xmem_usage(void *vaddr, uint32_t elt_num,
+	size_t total_elt_sz, const phys_addr_t paddr[], uint32_t pg_num,
+	uint32_t pg_shift);
 
 /**
  * Walk list of all memory pools
@@ -1393,7 +1278,7 @@ ssize_t rte_mempool_xmem_usage(void *vaddr, uint32_t elt_num, size_t elt_sz,
  * @param arg
  *   Argument passed to iterator
  */
-void rte_mempool_walk(void (*func)(const struct rte_mempool *, void *arg),
+void rte_mempool_walk(void (*func)(struct rte_mempool *, void *arg),
 		      void *arg);
 
 #ifdef __cplusplus