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35 #ifndef _RTE_MEMPOOL_H_
36 #define _RTE_MEMPOOL_H_
42 * A memory pool is an allocator of fixed-size object. It is
43 * identified by its name, and uses a ring to store free objects. It
44 * provides some other optional services, like a per-core object
45 * cache, and an alignment helper to ensure that objects are padded
46 * to spread them equally on all RAM channels, ranks, and so on.
48 * Objects owned by a mempool should never be added in another
49 * mempool. When an object is freed using rte_mempool_put() or
50 * equivalent, the object data is not modified; the user can save some
51 * meta-data in the object data and retrieve them when allocating a
54 * Note: the mempool implementation is not preemptible. An lcore must not be
55 * interrupted by another task that uses the same mempool (because it uses a
56 * ring which is not preemptible). Also, usual mempool functions like
57 * rte_mempool_get() or rte_mempool_put() are designed to be called from an EAL
58 * thread due to the internal per-lcore cache. Due to the lack of caching,
59 * rte_mempool_get() or rte_mempool_put() performance will suffer when called
60 * by non-EAL threads. Instead, non-EAL threads should call
61 * rte_mempool_generic_get() or rte_mempool_generic_put() with a user cache
62 * created with rte_mempool_cache_create().
70 #include <sys/queue.h>
72 #include <rte_spinlock.h>
74 #include <rte_debug.h>
75 #include <rte_lcore.h>
76 #include <rte_memory.h>
77 #include <rte_branch_prediction.h>
79 #include <rte_memcpy.h>
80 #include <rte_common.h>
86 #define RTE_MEMPOOL_HEADER_COOKIE1 0xbadbadbadadd2e55ULL /**< Header cookie. */
87 #define RTE_MEMPOOL_HEADER_COOKIE2 0xf2eef2eedadd2e55ULL /**< Header cookie. */
88 #define RTE_MEMPOOL_TRAILER_COOKIE 0xadd2e55badbadbadULL /**< Trailer cookie.*/
90 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
92 * A structure that stores the mempool statistics (per-lcore).
94 struct rte_mempool_debug_stats {
95 uint64_t put_bulk; /**< Number of puts. */
96 uint64_t put_objs; /**< Number of objects successfully put. */
97 uint64_t get_success_bulk; /**< Successful allocation number. */
98 uint64_t get_success_objs; /**< Objects successfully allocated. */
99 uint64_t get_fail_bulk; /**< Failed allocation number. */
100 uint64_t get_fail_objs; /**< Objects that failed to be allocated. */
101 } __rte_cache_aligned;
105 * A structure that stores a per-core object cache.
107 struct rte_mempool_cache {
108 uint32_t size; /**< Size of the cache */
109 uint32_t flushthresh; /**< Threshold before we flush excess elements */
110 uint32_t len; /**< Current cache count */
112 * Cache is allocated to this size to allow it to overflow in certain
113 * cases to avoid needless emptying of cache.
115 void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
116 } __rte_cache_aligned;
119 * A structure that stores the size of mempool elements.
121 struct rte_mempool_objsz {
122 uint32_t elt_size; /**< Size of an element. */
123 uint32_t header_size; /**< Size of header (before elt). */
124 uint32_t trailer_size; /**< Size of trailer (after elt). */
126 /**< Total size of an object (header + elt + trailer). */
129 /**< Maximum length of a memory pool's name. */
130 #define RTE_MEMPOOL_NAMESIZE (RTE_RING_NAMESIZE - \
131 sizeof(RTE_MEMPOOL_MZ_PREFIX) + 1)
132 #define RTE_MEMPOOL_MZ_PREFIX "MP_"
135 #define RTE_MEMPOOL_MZ_FORMAT RTE_MEMPOOL_MZ_PREFIX "%s"
137 #define MEMPOOL_PG_SHIFT_MAX (sizeof(uintptr_t) * CHAR_BIT - 1)
139 /** Mempool over one chunk of physically continuous memory */
140 #define MEMPOOL_PG_NUM_DEFAULT 1
142 #ifndef RTE_MEMPOOL_ALIGN
143 #define RTE_MEMPOOL_ALIGN RTE_CACHE_LINE_SIZE
146 #define RTE_MEMPOOL_ALIGN_MASK (RTE_MEMPOOL_ALIGN - 1)
149 * Mempool object header structure
151 * Each object stored in mempools are prefixed by this header structure,
152 * it allows to retrieve the mempool pointer from the object and to
153 * iterate on all objects attached to a mempool. When debug is enabled,
154 * a cookie is also added in this structure preventing corruptions and
157 struct rte_mempool_objhdr {
158 STAILQ_ENTRY(rte_mempool_objhdr) next; /**< Next in list. */
159 struct rte_mempool *mp; /**< The mempool owning the object. */
160 phys_addr_t physaddr; /**< Physical address of the object. */
161 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
162 uint64_t cookie; /**< Debug cookie. */
167 * A list of object headers type
169 STAILQ_HEAD(rte_mempool_objhdr_list, rte_mempool_objhdr);
171 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
174 * Mempool object trailer structure
176 * In debug mode, each object stored in mempools are suffixed by this
177 * trailer structure containing a cookie preventing memory corruptions.
179 struct rte_mempool_objtlr {
180 uint64_t cookie; /**< Debug cookie. */
186 * A list of memory where objects are stored
188 STAILQ_HEAD(rte_mempool_memhdr_list, rte_mempool_memhdr);
191 * Callback used to free a memory chunk
193 typedef void (rte_mempool_memchunk_free_cb_t)(struct rte_mempool_memhdr *memhdr,
197 * Mempool objects memory header structure
199 * The memory chunks where objects are stored. Each chunk is virtually
200 * and physically contiguous.
202 struct rte_mempool_memhdr {
203 STAILQ_ENTRY(rte_mempool_memhdr) next; /**< Next in list. */
204 struct rte_mempool *mp; /**< The mempool owning the chunk */
205 void *addr; /**< Virtual address of the chunk */
206 phys_addr_t phys_addr; /**< Physical address of the chunk */
207 size_t len; /**< length of the chunk */
208 rte_mempool_memchunk_free_cb_t *free_cb; /**< Free callback */
209 void *opaque; /**< Argument passed to the free callback */
213 * The RTE mempool structure.
217 * Note: this field kept the RTE_MEMZONE_NAMESIZE size due to ABI
218 * compatibility requirements, it could be changed to
219 * RTE_MEMPOOL_NAMESIZE next time the ABI changes
221 char name[RTE_MEMZONE_NAMESIZE]; /**< Name of mempool. */
224 void *pool_data; /**< Ring or pool to store objects. */
225 uint64_t pool_id; /**< External mempool identifier. */
227 void *pool_config; /**< optional args for ops alloc. */
228 const struct rte_memzone *mz; /**< Memzone where pool is alloc'd. */
229 unsigned int flags; /**< Flags of the mempool. */
230 int socket_id; /**< Socket id passed at create. */
231 uint32_t size; /**< Max size of the mempool. */
233 /**< Size of per-lcore default local cache. */
235 uint32_t elt_size; /**< Size of an element. */
236 uint32_t header_size; /**< Size of header (before elt). */
237 uint32_t trailer_size; /**< Size of trailer (after elt). */
239 unsigned private_data_size; /**< Size of private data. */
241 * Index into rte_mempool_ops_table array of mempool ops
242 * structs, which contain callback function pointers.
243 * We're using an index here rather than pointers to the callbacks
244 * to facilitate any secondary processes that may want to use
249 struct rte_mempool_cache *local_cache; /**< Per-lcore local cache */
251 uint32_t populated_size; /**< Number of populated objects. */
252 struct rte_mempool_objhdr_list elt_list; /**< List of objects in pool */
253 uint32_t nb_mem_chunks; /**< Number of memory chunks */
254 struct rte_mempool_memhdr_list mem_list; /**< List of memory chunks */
256 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
257 /** Per-lcore statistics. */
258 struct rte_mempool_debug_stats stats[RTE_MAX_LCORE];
260 } __rte_cache_aligned;
262 #define MEMPOOL_F_NO_SPREAD 0x0001 /**< Do not spread among memory channels. */
263 #define MEMPOOL_F_NO_CACHE_ALIGN 0x0002 /**< Do not align objs on cache lines.*/
264 #define MEMPOOL_F_SP_PUT 0x0004 /**< Default put is "single-producer".*/
265 #define MEMPOOL_F_SC_GET 0x0008 /**< Default get is "single-consumer".*/
266 #define MEMPOOL_F_POOL_CREATED 0x0010 /**< Internal: pool is created. */
267 #define MEMPOOL_F_NO_PHYS_CONTIG 0x0020 /**< Don't need physically contiguous objs. */
269 * This capability flag is advertised by a mempool handler, if the whole
270 * memory area containing the objects must be physically contiguous.
271 * Note: This flag should not be passed by application.
273 #define MEMPOOL_F_CAPA_PHYS_CONTIG 0x0040
275 * This capability flag is advertised by a mempool handler. Used for a case
276 * where mempool driver wants object start address(vaddr) aligned to block
277 * size(/ total element size).
280 * - This flag should not be passed by application.
281 * Flag used for mempool driver only.
282 * - Mempool driver must also set MEMPOOL_F_CAPA_PHYS_CONTIG flag along with
283 * MEMPOOL_F_CAPA_BLK_ALIGNED_OBJECTS.
285 #define MEMPOOL_F_CAPA_BLK_ALIGNED_OBJECTS 0x0080
288 * @internal When debug is enabled, store some statistics.
291 * Pointer to the memory pool.
293 * Name of the statistics field to increment in the memory pool.
295 * Number to add to the object-oriented statistics.
297 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
298 #define __MEMPOOL_STAT_ADD(mp, name, n) do { \
299 unsigned __lcore_id = rte_lcore_id(); \
300 if (__lcore_id < RTE_MAX_LCORE) { \
301 mp->stats[__lcore_id].name##_objs += n; \
302 mp->stats[__lcore_id].name##_bulk += 1; \
306 #define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
310 * Calculate the size of the mempool header.
313 * Pointer to the memory pool.
315 * Size of the per-lcore cache.
317 #define MEMPOOL_HEADER_SIZE(mp, cs) \
318 (sizeof(*(mp)) + (((cs) == 0) ? 0 : \
319 (sizeof(struct rte_mempool_cache) * RTE_MAX_LCORE)))
321 /* return the header of a mempool object (internal) */
322 static inline struct rte_mempool_objhdr *__mempool_get_header(void *obj)
324 return (struct rte_mempool_objhdr *)RTE_PTR_SUB(obj,
325 sizeof(struct rte_mempool_objhdr));
329 * Return a pointer to the mempool owning this object.
332 * An object that is owned by a pool. If this is not the case,
333 * the behavior is undefined.
335 * A pointer to the mempool structure.
337 static inline struct rte_mempool *rte_mempool_from_obj(void *obj)
339 struct rte_mempool_objhdr *hdr = __mempool_get_header(obj);
343 /* return the trailer of a mempool object (internal) */
344 static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
346 struct rte_mempool *mp = rte_mempool_from_obj(obj);
347 return (struct rte_mempool_objtlr *)RTE_PTR_ADD(obj, mp->elt_size);
351 * @internal Check and update cookies or panic.
354 * Pointer to the memory pool.
355 * @param obj_table_const
356 * Pointer to a table of void * pointers (objects).
358 * Index of object in object table.
360 * - 0: object is supposed to be allocated, mark it as free
361 * - 1: object is supposed to be free, mark it as allocated
362 * - 2: just check that cookie is valid (free or allocated)
364 void rte_mempool_check_cookies(const struct rte_mempool *mp,
365 void * const *obj_table_const, unsigned n, int free);
367 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
368 #define __mempool_check_cookies(mp, obj_table_const, n, free) \
369 rte_mempool_check_cookies(mp, obj_table_const, n, free)
371 #define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0)
372 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
374 #define RTE_MEMPOOL_OPS_NAMESIZE 32 /**< Max length of ops struct name. */
377 * Prototype for implementation specific data provisioning function.
379 * The function should provide the implementation specific memory for
380 * use by the other mempool ops functions in a given mempool ops struct.
381 * E.g. the default ops provides an instance of the rte_ring for this purpose.
382 * it will most likely point to a different type of data structure, and
383 * will be transparent to the application programmer.
384 * This function should set mp->pool_data.
386 typedef int (*rte_mempool_alloc_t)(struct rte_mempool *mp);
389 * Free the opaque private data pointed to by mp->pool_data pointer.
391 typedef void (*rte_mempool_free_t)(struct rte_mempool *mp);
394 * Enqueue an object into the external pool.
396 typedef int (*rte_mempool_enqueue_t)(struct rte_mempool *mp,
397 void * const *obj_table, unsigned int n);
400 * Dequeue an object from the external pool.
402 typedef int (*rte_mempool_dequeue_t)(struct rte_mempool *mp,
403 void **obj_table, unsigned int n);
406 * Return the number of available objects in the external pool.
408 typedef unsigned (*rte_mempool_get_count)(const struct rte_mempool *mp);
411 * Get the mempool capabilities.
413 typedef int (*rte_mempool_get_capabilities_t)(const struct rte_mempool *mp,
414 unsigned int *flags);
416 /** Structure defining mempool operations structure */
417 struct rte_mempool_ops {
418 char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */
419 rte_mempool_alloc_t alloc; /**< Allocate private data. */
420 rte_mempool_free_t free; /**< Free the external pool. */
421 rte_mempool_enqueue_t enqueue; /**< Enqueue an object. */
422 rte_mempool_dequeue_t dequeue; /**< Dequeue an object. */
423 rte_mempool_get_count get_count; /**< Get qty of available objs. */
425 * Get the mempool capabilities
427 rte_mempool_get_capabilities_t get_capabilities;
428 } __rte_cache_aligned;
430 #define RTE_MEMPOOL_MAX_OPS_IDX 16 /**< Max registered ops structs */
433 * Structure storing the table of registered ops structs, each of which contain
434 * the function pointers for the mempool ops functions.
435 * Each process has its own storage for this ops struct array so that
436 * the mempools can be shared across primary and secondary processes.
437 * The indices used to access the array are valid across processes, whereas
438 * any function pointers stored directly in the mempool struct would not be.
439 * This results in us simply having "ops_index" in the mempool struct.
441 struct rte_mempool_ops_table {
442 rte_spinlock_t sl; /**< Spinlock for add/delete. */
443 uint32_t num_ops; /**< Number of used ops structs in the table. */
445 * Storage for all possible ops structs.
447 struct rte_mempool_ops ops[RTE_MEMPOOL_MAX_OPS_IDX];
448 } __rte_cache_aligned;
450 /** Array of registered ops structs. */
451 extern struct rte_mempool_ops_table rte_mempool_ops_table;
454 * @internal Get the mempool ops struct from its index.
457 * The index of the ops struct in the ops struct table. It must be a valid
458 * index: (0 <= idx < num_ops).
460 * The pointer to the ops struct in the table.
462 static inline struct rte_mempool_ops *
463 rte_mempool_get_ops(int ops_index)
465 RTE_VERIFY((ops_index >= 0) && (ops_index < RTE_MEMPOOL_MAX_OPS_IDX));
467 return &rte_mempool_ops_table.ops[ops_index];
471 * @internal Wrapper for mempool_ops alloc callback.
474 * Pointer to the memory pool.
476 * - 0: Success; successfully allocated mempool pool_data.
477 * - <0: Error; code of alloc function.
480 rte_mempool_ops_alloc(struct rte_mempool *mp);
483 * @internal Wrapper for mempool_ops dequeue callback.
486 * Pointer to the memory pool.
488 * Pointer to a table of void * pointers (objects).
490 * Number of objects to get.
492 * - 0: Success; got n objects.
493 * - <0: Error; code of dequeue function.
496 rte_mempool_ops_dequeue_bulk(struct rte_mempool *mp,
497 void **obj_table, unsigned n)
499 struct rte_mempool_ops *ops;
501 ops = rte_mempool_get_ops(mp->ops_index);
502 return ops->dequeue(mp, obj_table, n);
506 * @internal wrapper for mempool_ops enqueue callback.
509 * Pointer to the memory pool.
511 * Pointer to a table of void * pointers (objects).
513 * Number of objects to put.
515 * - 0: Success; n objects supplied.
516 * - <0: Error; code of enqueue function.
519 rte_mempool_ops_enqueue_bulk(struct rte_mempool *mp, void * const *obj_table,
522 struct rte_mempool_ops *ops;
524 ops = rte_mempool_get_ops(mp->ops_index);
525 return ops->enqueue(mp, obj_table, n);
529 * @internal wrapper for mempool_ops get_count callback.
532 * Pointer to the memory pool.
534 * The number of available objects in the external pool.
537 rte_mempool_ops_get_count(const struct rte_mempool *mp);
540 * @internal wrapper for mempool_ops get_capabilities callback.
543 * Pointer to the memory pool.
545 * Pointer to the mempool flags.
547 * - 0: Success; The mempool driver has advertised his pool capabilities in
549 * - -ENOTSUP - doesn't support get_capabilities ops (valid case).
550 * - Otherwise, pool create fails.
553 rte_mempool_ops_get_capabilities(const struct rte_mempool *mp,
554 unsigned int *flags);
557 * @internal wrapper for mempool_ops free callback.
560 * Pointer to the memory pool.
563 rte_mempool_ops_free(struct rte_mempool *mp);
566 * Set the ops of a mempool.
568 * This can only be done on a mempool that is not populated, i.e. just after
569 * a call to rte_mempool_create_empty().
572 * Pointer to the memory pool.
574 * Name of the ops structure to use for this mempool.
576 * Opaque data that can be passed by the application to the ops functions.
578 * - 0: Success; the mempool is now using the requested ops functions.
579 * - -EINVAL - Invalid ops struct name provided.
580 * - -EEXIST - mempool already has an ops struct assigned.
583 rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,
587 * Register mempool operations.
590 * Pointer to an ops structure to register.
592 * - >=0: Success; return the index of the ops struct in the table.
593 * - -EINVAL - some missing callbacks while registering ops struct.
594 * - -ENOSPC - the maximum number of ops structs has been reached.
596 int rte_mempool_register_ops(const struct rte_mempool_ops *ops);
599 * Macro to statically register the ops of a mempool handler.
600 * Note that the rte_mempool_register_ops fails silently here when
601 * more than RTE_MEMPOOL_MAX_OPS_IDX is registered.
603 #define MEMPOOL_REGISTER_OPS(ops) \
604 void mp_hdlr_init_##ops(void); \
605 void __attribute__((constructor, used)) mp_hdlr_init_##ops(void)\
607 rte_mempool_register_ops(&ops); \
611 * An object callback function for mempool.
613 * Used by rte_mempool_create() and rte_mempool_obj_iter().
615 typedef void (rte_mempool_obj_cb_t)(struct rte_mempool *mp,
616 void *opaque, void *obj, unsigned obj_idx);
617 typedef rte_mempool_obj_cb_t rte_mempool_obj_ctor_t; /* compat */
620 * A memory callback function for mempool.
622 * Used by rte_mempool_mem_iter().
624 typedef void (rte_mempool_mem_cb_t)(struct rte_mempool *mp,
625 void *opaque, struct rte_mempool_memhdr *memhdr,
629 * A mempool constructor callback function.
631 * Arguments are the mempool and the opaque pointer given by the user in
632 * rte_mempool_create().
634 typedef void (rte_mempool_ctor_t)(struct rte_mempool *, void *);
637 * Create a new mempool named *name* in memory.
639 * This function uses ``rte_memzone_reserve()`` to allocate memory. The
640 * pool contains n elements of elt_size. Its size is set to n.
643 * The name of the mempool.
645 * The number of elements in the mempool. The optimum size (in terms of
646 * memory usage) for a mempool is when n is a power of two minus one:
649 * The size of each element.
651 * If cache_size is non-zero, the rte_mempool library will try to
652 * limit the accesses to the common lockless pool, by maintaining a
653 * per-lcore object cache. This argument must be lower or equal to
654 * CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE and n / 1.5. It is advised to choose
655 * cache_size to have "n modulo cache_size == 0": if this is
656 * not the case, some elements will always stay in the pool and will
657 * never be used. The access to the per-lcore table is of course
658 * faster than the multi-producer/consumer pool. The cache can be
659 * disabled if the cache_size argument is set to 0; it can be useful to
660 * avoid losing objects in cache.
661 * @param private_data_size
662 * The size of the private data appended after the mempool
663 * structure. This is useful for storing some private data after the
664 * mempool structure, as is done for rte_mbuf_pool for example.
666 * A function pointer that is called for initialization of the pool,
667 * before object initialization. The user can initialize the private
668 * data in this function if needed. This parameter can be NULL if
671 * An opaque pointer to data that can be used in the mempool
672 * constructor function.
674 * A function pointer that is called for each object at
675 * initialization of the pool. The user can set some meta data in
676 * objects if needed. This parameter can be NULL if not needed.
677 * The obj_init() function takes the mempool pointer, the init_arg,
678 * the object pointer and the object number as parameters.
679 * @param obj_init_arg
680 * An opaque pointer to data that can be used as an argument for
681 * each call to the object constructor function.
683 * The *socket_id* argument is the socket identifier in the case of
684 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
685 * constraint for the reserved zone.
687 * The *flags* arguments is an OR of following flags:
688 * - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
689 * between channels in RAM: the pool allocator will add padding
690 * between objects depending on the hardware configuration. See
691 * Memory alignment constraints for details. If this flag is set,
692 * the allocator will just align them to a cache line.
693 * - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
694 * cache-aligned. This flag removes this constraint, and no
695 * padding will be present between objects. This flag implies
696 * MEMPOOL_F_NO_SPREAD.
697 * - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
698 * when using rte_mempool_put() or rte_mempool_put_bulk() is
699 * "single-producer". Otherwise, it is "multi-producers".
700 * - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
701 * when using rte_mempool_get() or rte_mempool_get_bulk() is
702 * "single-consumer". Otherwise, it is "multi-consumers".
703 * - MEMPOOL_F_NO_PHYS_CONTIG: If set, allocated objects won't
704 * necessarily be contiguous in physical memory.
706 * The pointer to the new allocated mempool, on success. NULL on error
707 * with rte_errno set appropriately. Possible rte_errno values include:
708 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
709 * - E_RTE_SECONDARY - function was called from a secondary process instance
710 * - EINVAL - cache size provided is too large
711 * - ENOSPC - the maximum number of memzones has already been allocated
712 * - EEXIST - a memzone with the same name already exists
713 * - ENOMEM - no appropriate memory area found in which to create memzone
716 rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
717 unsigned cache_size, unsigned private_data_size,
718 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
719 rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
720 int socket_id, unsigned flags);
723 * Create a new mempool named *name* in memory.
725 * The pool contains n elements of elt_size. Its size is set to n.
726 * This function uses ``memzone_reserve()`` to allocate the mempool header
727 * (and the objects if vaddr is NULL).
728 * Depending on the input parameters, mempool elements can be either allocated
729 * together with the mempool header, or an externally provided memory buffer
730 * could be used to store mempool objects. In later case, that external
731 * memory buffer can consist of set of disjoint physical pages.
734 * The name of the mempool.
736 * The number of elements in the mempool. The optimum size (in terms of
737 * memory usage) for a mempool is when n is a power of two minus one:
740 * The size of each element.
742 * Size of the cache. See rte_mempool_create() for details.
743 * @param private_data_size
744 * The size of the private data appended after the mempool
745 * structure. This is useful for storing some private data after the
746 * mempool structure, as is done for rte_mbuf_pool for example.
748 * A function pointer that is called for initialization of the pool,
749 * before object initialization. The user can initialize the private
750 * data in this function if needed. This parameter can be NULL if
753 * An opaque pointer to data that can be used in the mempool
754 * constructor function.
756 * A function called for each object at initialization of the pool.
757 * See rte_mempool_create() for details.
758 * @param obj_init_arg
759 * An opaque pointer passed to the object constructor function.
761 * The *socket_id* argument is the socket identifier in the case of
762 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
763 * constraint for the reserved zone.
765 * Flags controlling the behavior of the mempool. See
766 * rte_mempool_create() for details.
768 * Virtual address of the externally allocated memory buffer.
769 * Will be used to store mempool objects.
771 * Array of physical addresses of the pages that comprises given memory
774 * Number of elements in the paddr array.
776 * LOG2 of the physical pages size.
778 * The pointer to the new allocated mempool, on success. NULL on error
779 * with rte_errno set appropriately. See rte_mempool_create() for details.
782 rte_mempool_xmem_create(const char *name, unsigned n, unsigned elt_size,
783 unsigned cache_size, unsigned private_data_size,
784 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
785 rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
786 int socket_id, unsigned flags, void *vaddr,
787 const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift);
790 * Create an empty mempool
792 * The mempool is allocated and initialized, but it is not populated: no
793 * memory is allocated for the mempool elements. The user has to call
794 * rte_mempool_populate_*() to add memory chunks to the pool. Once
795 * populated, the user may also want to initialize each object with
796 * rte_mempool_obj_iter().
799 * The name of the mempool.
801 * The maximum number of elements that can be added in the mempool.
802 * The optimum size (in terms of memory usage) for a mempool is when n
803 * is a power of two minus one: n = (2^q - 1).
805 * The size of each element.
807 * Size of the cache. See rte_mempool_create() for details.
808 * @param private_data_size
809 * The size of the private data appended after the mempool
810 * structure. This is useful for storing some private data after the
811 * mempool structure, as is done for rte_mbuf_pool for example.
813 * The *socket_id* argument is the socket identifier in the case of
814 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
815 * constraint for the reserved zone.
817 * Flags controlling the behavior of the mempool. See
818 * rte_mempool_create() for details.
820 * The pointer to the new allocated mempool, on success. NULL on error
821 * with rte_errno set appropriately. See rte_mempool_create() for details.
824 rte_mempool_create_empty(const char *name, unsigned n, unsigned elt_size,
825 unsigned cache_size, unsigned private_data_size,
826 int socket_id, unsigned flags);
830 * Unlink the mempool from global list, free the memory chunks, and all
831 * memory referenced by the mempool. The objects must not be used by
832 * other cores as they will be freed.
835 * A pointer to the mempool structure.
838 rte_mempool_free(struct rte_mempool *mp);
841 * Add physically contiguous memory for objects in the pool at init
843 * Add a virtually and physically contiguous memory chunk in the pool
844 * where objects can be instantiated.
846 * If the given physical address is unknown (paddr = RTE_BAD_PHYS_ADDR),
847 * the chunk doesn't need to be physically contiguous (only virtually),
848 * and allocated objects may span two pages.
851 * A pointer to the mempool structure.
853 * The virtual address of memory that should be used to store objects.
855 * The physical address
857 * The length of memory in bytes.
859 * The callback used to free this chunk when destroying the mempool.
861 * An opaque argument passed to free_cb.
863 * The number of objects added on success.
864 * On error, the chunk is not added in the memory list of the
865 * mempool and a negative errno is returned.
867 int rte_mempool_populate_phys(struct rte_mempool *mp, char *vaddr,
868 phys_addr_t paddr, size_t len, rte_mempool_memchunk_free_cb_t *free_cb,
872 * Add physical memory for objects in the pool at init
874 * Add a virtually contiguous memory chunk in the pool where objects can
875 * be instantiated. The physical addresses corresponding to the virtual
876 * area are described in paddr[], pg_num, pg_shift.
879 * A pointer to the mempool structure.
881 * The virtual address of memory that should be used to store objects.
883 * An array of physical addresses of each page composing the virtual
886 * Number of elements in the paddr array.
888 * LOG2 of the physical pages size.
890 * The callback used to free this chunk when destroying the mempool.
892 * An opaque argument passed to free_cb.
894 * The number of objects added on success.
895 * On error, the chunks are not added in the memory list of the
896 * mempool and a negative errno is returned.
898 int rte_mempool_populate_phys_tab(struct rte_mempool *mp, char *vaddr,
899 const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift,
900 rte_mempool_memchunk_free_cb_t *free_cb, void *opaque);
903 * Add virtually contiguous memory for objects in the pool at init
905 * Add a virtually contiguous memory chunk in the pool where objects can
909 * A pointer to the mempool structure.
911 * The virtual address of memory that should be used to store objects.
912 * Must be page-aligned.
914 * The length of memory in bytes. Must be page-aligned.
916 * The size of memory pages in this virtual area.
918 * The callback used to free this chunk when destroying the mempool.
920 * An opaque argument passed to free_cb.
922 * The number of objects added on success.
923 * On error, the chunk is not added in the memory list of the
924 * mempool and a negative errno is returned.
927 rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
928 size_t len, size_t pg_sz, rte_mempool_memchunk_free_cb_t *free_cb,
932 * Add memory for objects in the pool at init
934 * This is the default function used by rte_mempool_create() to populate
935 * the mempool. It adds memory allocated using rte_memzone_reserve().
938 * A pointer to the mempool structure.
940 * The number of objects added on success.
941 * On error, the chunk is not added in the memory list of the
942 * mempool and a negative errno is returned.
944 int rte_mempool_populate_default(struct rte_mempool *mp);
947 * Add memory from anonymous mapping for objects in the pool at init
949 * This function mmap an anonymous memory zone that is locked in
950 * memory to store the objects of the mempool.
953 * A pointer to the mempool structure.
955 * The number of objects added on success.
956 * On error, the chunk is not added in the memory list of the
957 * mempool and a negative errno is returned.
959 int rte_mempool_populate_anon(struct rte_mempool *mp);
962 * Call a function for each mempool element
964 * Iterate across all objects attached to a rte_mempool and call the
965 * callback function on it.
968 * A pointer to an initialized mempool.
970 * A function pointer that is called for each object.
972 * An opaque pointer passed to the callback function.
974 * Number of objects iterated.
976 uint32_t rte_mempool_obj_iter(struct rte_mempool *mp,
977 rte_mempool_obj_cb_t *obj_cb, void *obj_cb_arg);
980 * Call a function for each mempool memory chunk
982 * Iterate across all memory chunks attached to a rte_mempool and call
983 * the callback function on it.
986 * A pointer to an initialized mempool.
988 * A function pointer that is called for each memory chunk.
990 * An opaque pointer passed to the callback function.
992 * Number of memory chunks iterated.
994 uint32_t rte_mempool_mem_iter(struct rte_mempool *mp,
995 rte_mempool_mem_cb_t *mem_cb, void *mem_cb_arg);
998 * Dump the status of the mempool to a file.
1001 * A pointer to a file for output
1003 * A pointer to the mempool structure.
1005 void rte_mempool_dump(FILE *f, struct rte_mempool *mp);
1008 * Create a user-owned mempool cache.
1010 * This can be used by non-EAL threads to enable caching when they
1011 * interact with a mempool.
1014 * The size of the mempool cache. See rte_mempool_create()'s cache_size
1015 * parameter description for more information. The same limits and
1016 * considerations apply here too.
1018 * The socket identifier in the case of NUMA. The value can be
1019 * SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone.
1021 struct rte_mempool_cache *
1022 rte_mempool_cache_create(uint32_t size, int socket_id);
1025 * Free a user-owned mempool cache.
1028 * A pointer to the mempool cache.
1031 rte_mempool_cache_free(struct rte_mempool_cache *cache);
1034 * Flush a user-owned mempool cache to the specified mempool.
1037 * A pointer to the mempool cache.
1039 * A pointer to the mempool.
1041 static __rte_always_inline void
1042 rte_mempool_cache_flush(struct rte_mempool_cache *cache,
1043 struct rte_mempool *mp)
1045 rte_mempool_ops_enqueue_bulk(mp, cache->objs, cache->len);
1050 * Get a pointer to the per-lcore default mempool cache.
1053 * A pointer to the mempool structure.
1055 * The logical core id.
1057 * A pointer to the mempool cache or NULL if disabled or non-EAL thread.
1059 static __rte_always_inline struct rte_mempool_cache *
1060 rte_mempool_default_cache(struct rte_mempool *mp, unsigned lcore_id)
1062 if (mp->cache_size == 0)
1065 if (lcore_id >= RTE_MAX_LCORE)
1068 return &mp->local_cache[lcore_id];
1072 * @internal Put several objects back in the mempool; used internally.
1074 * A pointer to the mempool structure.
1076 * A pointer to a table of void * pointers (objects).
1078 * The number of objects to store back in the mempool, must be strictly
1081 * A pointer to a mempool cache structure. May be NULL if not needed.
1083 static __rte_always_inline void
1084 __mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
1085 unsigned int n, struct rte_mempool_cache *cache)
1089 /* increment stat now, adding in mempool always success */
1090 __MEMPOOL_STAT_ADD(mp, put, n);
1092 /* No cache provided or if put would overflow mem allocated for cache */
1093 if (unlikely(cache == NULL || n > RTE_MEMPOOL_CACHE_MAX_SIZE))
1096 cache_objs = &cache->objs[cache->len];
1099 * The cache follows the following algorithm
1100 * 1. Add the objects to the cache
1101 * 2. Anything greater than the cache min value (if it crosses the
1102 * cache flush threshold) is flushed to the ring.
1105 /* Add elements back into the cache */
1106 rte_memcpy(&cache_objs[0], obj_table, sizeof(void *) * n);
1110 if (cache->len >= cache->flushthresh) {
1111 rte_mempool_ops_enqueue_bulk(mp, &cache->objs[cache->size],
1112 cache->len - cache->size);
1113 cache->len = cache->size;
1120 /* push remaining objects in ring */
1121 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
1122 if (rte_mempool_ops_enqueue_bulk(mp, obj_table, n) < 0)
1123 rte_panic("cannot put objects in mempool\n");
1125 rte_mempool_ops_enqueue_bulk(mp, obj_table, n);
1131 * Put several objects back in the mempool.
1134 * A pointer to the mempool structure.
1136 * A pointer to a table of void * pointers (objects).
1138 * The number of objects to add in the mempool from the obj_table.
1140 * A pointer to a mempool cache structure. May be NULL if not needed.
1142 static __rte_always_inline void
1143 rte_mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
1144 unsigned int n, struct rte_mempool_cache *cache)
1146 __mempool_check_cookies(mp, obj_table, n, 0);
1147 __mempool_generic_put(mp, obj_table, n, cache);
1151 * Put several objects back in the mempool.
1153 * This function calls the multi-producer or the single-producer
1154 * version depending on the default behavior that was specified at
1155 * mempool creation time (see flags).
1158 * A pointer to the mempool structure.
1160 * A pointer to a table of void * pointers (objects).
1162 * The number of objects to add in the mempool from obj_table.
1164 static __rte_always_inline void
1165 rte_mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
1168 struct rte_mempool_cache *cache;
1169 cache = rte_mempool_default_cache(mp, rte_lcore_id());
1170 rte_mempool_generic_put(mp, obj_table, n, cache);
1174 * Put one object back in the mempool.
1176 * This function calls the multi-producer or the single-producer
1177 * version depending on the default behavior that was specified at
1178 * mempool creation time (see flags).
1181 * A pointer to the mempool structure.
1183 * A pointer to the object to be added.
1185 static __rte_always_inline void
1186 rte_mempool_put(struct rte_mempool *mp, void *obj)
1188 rte_mempool_put_bulk(mp, &obj, 1);
1192 * @internal Get several objects from the mempool; used internally.
1194 * A pointer to the mempool structure.
1196 * A pointer to a table of void * pointers (objects).
1198 * The number of objects to get, must be strictly positive.
1200 * A pointer to a mempool cache structure. May be NULL if not needed.
1202 * - >=0: Success; number of objects supplied.
1203 * - <0: Error; code of ring dequeue function.
1205 static __rte_always_inline int
1206 __mempool_generic_get(struct rte_mempool *mp, void **obj_table,
1207 unsigned int n, struct rte_mempool_cache *cache)
1210 uint32_t index, len;
1213 /* No cache provided or cannot be satisfied from cache */
1214 if (unlikely(cache == NULL || n >= cache->size))
1217 cache_objs = cache->objs;
1219 /* Can this be satisfied from the cache? */
1220 if (cache->len < n) {
1221 /* No. Backfill the cache first, and then fill from it */
1222 uint32_t req = n + (cache->size - cache->len);
1224 /* How many do we require i.e. number to fill the cache + the request */
1225 ret = rte_mempool_ops_dequeue_bulk(mp,
1226 &cache->objs[cache->len], req);
1227 if (unlikely(ret < 0)) {
1229 * In the offchance that we are buffer constrained,
1230 * where we are not able to allocate cache + n, go to
1231 * the ring directly. If that fails, we are truly out of
1240 /* Now fill in the response ... */
1241 for (index = 0, len = cache->len - 1; index < n; ++index, len--, obj_table++)
1242 *obj_table = cache_objs[len];
1246 __MEMPOOL_STAT_ADD(mp, get_success, n);
1252 /* get remaining objects from ring */
1253 ret = rte_mempool_ops_dequeue_bulk(mp, obj_table, n);
1256 __MEMPOOL_STAT_ADD(mp, get_fail, n);
1258 __MEMPOOL_STAT_ADD(mp, get_success, n);
1264 * Get several objects from the mempool.
1266 * If cache is enabled, objects will be retrieved first from cache,
1267 * subsequently from the common pool. Note that it can return -ENOENT when
1268 * the local cache and common pool are empty, even if cache from other
1272 * A pointer to the mempool structure.
1274 * A pointer to a table of void * pointers (objects) that will be filled.
1276 * The number of objects to get from mempool to obj_table.
1278 * A pointer to a mempool cache structure. May be NULL if not needed.
1280 * - 0: Success; objects taken.
1281 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1283 static __rte_always_inline int
1284 rte_mempool_generic_get(struct rte_mempool *mp, void **obj_table,
1285 unsigned int n, struct rte_mempool_cache *cache)
1288 ret = __mempool_generic_get(mp, obj_table, n, cache);
1290 __mempool_check_cookies(mp, obj_table, n, 1);
1295 * Get several objects from the mempool.
1297 * This function calls the multi-consumers or the single-consumer
1298 * version, depending on the default behaviour that was specified at
1299 * mempool creation time (see flags).
1301 * If cache is enabled, objects will be retrieved first from cache,
1302 * subsequently from the common pool. Note that it can return -ENOENT when
1303 * the local cache and common pool are empty, even if cache from other
1307 * A pointer to the mempool structure.
1309 * A pointer to a table of void * pointers (objects) that will be filled.
1311 * The number of objects to get from the mempool to obj_table.
1313 * - 0: Success; objects taken
1314 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1316 static __rte_always_inline int
1317 rte_mempool_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned int n)
1319 struct rte_mempool_cache *cache;
1320 cache = rte_mempool_default_cache(mp, rte_lcore_id());
1321 return rte_mempool_generic_get(mp, obj_table, n, cache);
1325 * Get one object from the mempool.
1327 * This function calls the multi-consumers or the single-consumer
1328 * version, depending on the default behavior that was specified at
1329 * mempool creation (see flags).
1331 * If cache is enabled, objects will be retrieved first from cache,
1332 * subsequently from the common pool. Note that it can return -ENOENT when
1333 * the local cache and common pool are empty, even if cache from other
1337 * A pointer to the mempool structure.
1339 * A pointer to a void * pointer (object) that will be filled.
1341 * - 0: Success; objects taken.
1342 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1344 static __rte_always_inline int
1345 rte_mempool_get(struct rte_mempool *mp, void **obj_p)
1347 return rte_mempool_get_bulk(mp, obj_p, 1);
1351 * Return the number of entries in the mempool.
1353 * When cache is enabled, this function has to browse the length of
1354 * all lcores, so it should not be used in a data path, but only for
1355 * debug purposes. User-owned mempool caches are not accounted for.
1358 * A pointer to the mempool structure.
1360 * The number of entries in the mempool.
1362 unsigned int rte_mempool_avail_count(const struct rte_mempool *mp);
1365 * Return the number of elements which have been allocated from the mempool
1367 * When cache is enabled, this function has to browse the length of
1368 * all lcores, so it should not be used in a data path, but only for
1372 * A pointer to the mempool structure.
1374 * The number of free entries in the mempool.
1377 rte_mempool_in_use_count(const struct rte_mempool *mp);
1380 * Test if the mempool is full.
1382 * When cache is enabled, this function has to browse the length of all
1383 * lcores, so it should not be used in a data path, but only for debug
1384 * purposes. User-owned mempool caches are not accounted for.
1387 * A pointer to the mempool structure.
1389 * - 1: The mempool is full.
1390 * - 0: The mempool is not full.
1393 rte_mempool_full(const struct rte_mempool *mp)
1395 return !!(rte_mempool_avail_count(mp) == mp->size);
1399 * Test if the mempool is empty.
1401 * When cache is enabled, this function has to browse the length of all
1402 * lcores, so it should not be used in a data path, but only for debug
1403 * purposes. User-owned mempool caches are not accounted for.
1406 * A pointer to the mempool structure.
1408 * - 1: The mempool is empty.
1409 * - 0: The mempool is not empty.
1412 rte_mempool_empty(const struct rte_mempool *mp)
1414 return !!(rte_mempool_avail_count(mp) == 0);
1418 * Return the physical address of elt, which is an element of the pool mp.
1421 * A pointer to the mempool structure.
1423 * A pointer (virtual address) to the element of the pool.
1425 * The physical address of the elt element.
1426 * If the mempool was created with MEMPOOL_F_NO_PHYS_CONTIG, the
1427 * returned value is RTE_BAD_PHYS_ADDR.
1429 static inline phys_addr_t
1430 rte_mempool_virt2phy(__rte_unused const struct rte_mempool *mp, const void *elt)
1432 const struct rte_mempool_objhdr *hdr;
1433 hdr = (const struct rte_mempool_objhdr *)RTE_PTR_SUB(elt,
1435 return hdr->physaddr;
1439 * Check the consistency of mempool objects.
1441 * Verify the coherency of fields in the mempool structure. Also check
1442 * that the cookies of mempool objects (even the ones that are not
1443 * present in pool) have a correct value. If not, a panic will occur.
1446 * A pointer to the mempool structure.
1448 void rte_mempool_audit(struct rte_mempool *mp);
1451 * Return a pointer to the private data in an mempool structure.
1454 * A pointer to the mempool structure.
1456 * A pointer to the private data.
1458 static inline void *rte_mempool_get_priv(struct rte_mempool *mp)
1461 MEMPOOL_HEADER_SIZE(mp, mp->cache_size);
1465 * Dump the status of all mempools on the console
1468 * A pointer to a file for output
1470 void rte_mempool_list_dump(FILE *f);
1473 * Search a mempool from its name
1476 * The name of the mempool.
1478 * The pointer to the mempool matching the name, or NULL if not found.
1480 * with rte_errno set appropriately. Possible rte_errno values include:
1481 * - ENOENT - required entry not available to return.
1484 struct rte_mempool *rte_mempool_lookup(const char *name);
1487 * Get the header, trailer and total size of a mempool element.
1489 * Given a desired size of the mempool element and mempool flags,
1490 * calculates header, trailer, body and total sizes of the mempool object.
1493 * The size of each element, without header and trailer.
1495 * The flags used for the mempool creation.
1496 * Consult rte_mempool_create() for more information about possible values.
1497 * The size of each element.
1499 * The calculated detailed size the mempool object. May be NULL.
1501 * Total size of the mempool object.
1503 uint32_t rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
1504 struct rte_mempool_objsz *sz);
1507 * Get the size of memory required to store mempool elements.
1509 * Calculate the maximum amount of memory required to store given number
1510 * of objects. Assume that the memory buffer will be aligned at page
1513 * Note that if object size is bigger then page size, then it assumes
1514 * that pages are grouped in subsets of physically continuous pages big
1515 * enough to store at least one object.
1518 * Number of elements.
1519 * @param total_elt_sz
1520 * The size of each element, including header and trailer, as returned
1521 * by rte_mempool_calc_obj_size().
1523 * LOG2 of the physical pages size. If set to 0, ignore page boundaries.
1525 * The mempool flags.
1527 * Required memory size aligned at page boundary.
1529 size_t rte_mempool_xmem_size(uint32_t elt_num, size_t total_elt_sz,
1530 uint32_t pg_shift, unsigned int flags);
1533 * Get the size of memory required to store mempool elements.
1535 * Calculate how much memory would be actually required with the given
1536 * memory footprint to store required number of objects.
1539 * Virtual address of the externally allocated memory buffer.
1540 * Will be used to store mempool objects.
1542 * Number of elements.
1543 * @param total_elt_sz
1544 * The size of each element, including header and trailer, as returned
1545 * by rte_mempool_calc_obj_size().
1547 * Array of physical addresses of the pages that comprises given memory
1550 * Number of elements in the paddr array.
1552 * LOG2 of the physical pages size.
1554 * The mempool flags.
1556 * On success, the number of bytes needed to store given number of
1557 * objects, aligned to the given page size. If the provided memory
1558 * buffer is too small, return a negative value whose absolute value
1559 * is the actual number of elements that can be stored in that buffer.
1561 ssize_t rte_mempool_xmem_usage(void *vaddr, uint32_t elt_num,
1562 size_t total_elt_sz, const phys_addr_t paddr[], uint32_t pg_num,
1563 uint32_t pg_shift, unsigned int flags);
1566 * Walk list of all memory pools
1571 * Argument passed to iterator
1573 void rte_mempool_walk(void (*func)(struct rte_mempool *, void *arg),
1580 #endif /* _RTE_MEMPOOL_H_ */