1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation.
3 * Copyright(c) 2016 6WIND S.A.
6 #ifndef _RTE_MEMPOOL_H_
7 #define _RTE_MEMPOOL_H_
13 * A memory pool is an allocator of fixed-size object. It is
14 * identified by its name, and uses a ring to store free objects. It
15 * provides some other optional services, like a per-core object
16 * cache, and an alignment helper to ensure that objects are padded
17 * to spread them equally on all RAM channels, ranks, and so on.
19 * Objects owned by a mempool should never be added in another
20 * mempool. When an object is freed using rte_mempool_put() or
21 * equivalent, the object data is not modified; the user can save some
22 * meta-data in the object data and retrieve them when allocating a
25 * Note: the mempool implementation is not preemptible. An lcore must not be
26 * interrupted by another task that uses the same mempool (because it uses a
27 * ring which is not preemptible). Also, usual mempool functions like
28 * rte_mempool_get() or rte_mempool_put() are designed to be called from an EAL
29 * thread due to the internal per-lcore cache. Due to the lack of caching,
30 * rte_mempool_get() or rte_mempool_put() performance will suffer when called
31 * by non-EAL threads. Instead, non-EAL threads should call
32 * rte_mempool_generic_get() or rte_mempool_generic_put() with a user cache
33 * created with rte_mempool_cache_create().
41 #include <sys/queue.h>
43 #include <rte_config.h>
44 #include <rte_spinlock.h>
46 #include <rte_debug.h>
47 #include <rte_lcore.h>
48 #include <rte_memory.h>
49 #include <rte_branch_prediction.h>
51 #include <rte_memcpy.h>
52 #include <rte_common.h>
58 #define RTE_MEMPOOL_HEADER_COOKIE1 0xbadbadbadadd2e55ULL /**< Header cookie. */
59 #define RTE_MEMPOOL_HEADER_COOKIE2 0xf2eef2eedadd2e55ULL /**< Header cookie. */
60 #define RTE_MEMPOOL_TRAILER_COOKIE 0xadd2e55badbadbadULL /**< Trailer cookie.*/
62 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
64 * A structure that stores the mempool statistics (per-lcore).
66 struct rte_mempool_debug_stats {
67 uint64_t put_bulk; /**< Number of puts. */
68 uint64_t put_objs; /**< Number of objects successfully put. */
69 uint64_t get_success_bulk; /**< Successful allocation number. */
70 uint64_t get_success_objs; /**< Objects successfully allocated. */
71 uint64_t get_fail_bulk; /**< Failed allocation number. */
72 uint64_t get_fail_objs; /**< Objects that failed to be allocated. */
73 /** Successful allocation number of contiguous blocks. */
74 uint64_t get_success_blks;
75 /** Failed allocation number of contiguous blocks. */
76 uint64_t get_fail_blks;
77 } __rte_cache_aligned;
81 * A structure that stores a per-core object cache.
83 struct rte_mempool_cache {
84 uint32_t size; /**< Size of the cache */
85 uint32_t flushthresh; /**< Threshold before we flush excess elements */
86 uint32_t len; /**< Current cache count */
88 * Cache is allocated to this size to allow it to overflow in certain
89 * cases to avoid needless emptying of cache.
91 void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
92 } __rte_cache_aligned;
95 * A structure that stores the size of mempool elements.
97 struct rte_mempool_objsz {
98 uint32_t elt_size; /**< Size of an element. */
99 uint32_t header_size; /**< Size of header (before elt). */
100 uint32_t trailer_size; /**< Size of trailer (after elt). */
102 /**< Total size of an object (header + elt + trailer). */
105 /**< Maximum length of a memory pool's name. */
106 #define RTE_MEMPOOL_NAMESIZE (RTE_RING_NAMESIZE - \
107 sizeof(RTE_MEMPOOL_MZ_PREFIX) + 1)
108 #define RTE_MEMPOOL_MZ_PREFIX "MP_"
111 #define RTE_MEMPOOL_MZ_FORMAT RTE_MEMPOOL_MZ_PREFIX "%s"
113 #define MEMPOOL_PG_SHIFT_MAX (sizeof(uintptr_t) * CHAR_BIT - 1)
115 /** Mempool over one chunk of physically continuous memory */
116 #define MEMPOOL_PG_NUM_DEFAULT 1
118 #ifndef RTE_MEMPOOL_ALIGN
120 * Alignment of elements inside mempool.
122 #define RTE_MEMPOOL_ALIGN RTE_CACHE_LINE_SIZE
125 #define RTE_MEMPOOL_ALIGN_MASK (RTE_MEMPOOL_ALIGN - 1)
128 * Mempool object header structure
130 * Each object stored in mempools are prefixed by this header structure,
131 * it allows to retrieve the mempool pointer from the object and to
132 * iterate on all objects attached to a mempool. When debug is enabled,
133 * a cookie is also added in this structure preventing corruptions and
136 struct rte_mempool_objhdr {
137 STAILQ_ENTRY(rte_mempool_objhdr) next; /**< Next in list. */
138 struct rte_mempool *mp; /**< The mempool owning the object. */
141 rte_iova_t iova; /**< IO address of the object. */
142 phys_addr_t physaddr; /**< deprecated - Physical address of the object. */
144 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
145 uint64_t cookie; /**< Debug cookie. */
150 * A list of object headers type
152 STAILQ_HEAD(rte_mempool_objhdr_list, rte_mempool_objhdr);
154 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
157 * Mempool object trailer structure
159 * In debug mode, each object stored in mempools are suffixed by this
160 * trailer structure containing a cookie preventing memory corruptions.
162 struct rte_mempool_objtlr {
163 uint64_t cookie; /**< Debug cookie. */
169 * A list of memory where objects are stored
171 STAILQ_HEAD(rte_mempool_memhdr_list, rte_mempool_memhdr);
174 * Callback used to free a memory chunk
176 typedef void (rte_mempool_memchunk_free_cb_t)(struct rte_mempool_memhdr *memhdr,
180 * Mempool objects memory header structure
182 * The memory chunks where objects are stored. Each chunk is virtually
183 * and physically contiguous.
185 struct rte_mempool_memhdr {
186 STAILQ_ENTRY(rte_mempool_memhdr) next; /**< Next in list. */
187 struct rte_mempool *mp; /**< The mempool owning the chunk */
188 void *addr; /**< Virtual address of the chunk */
191 rte_iova_t iova; /**< IO address of the chunk */
192 phys_addr_t phys_addr; /**< Physical address of the chunk */
194 size_t len; /**< length of the chunk */
195 rte_mempool_memchunk_free_cb_t *free_cb; /**< Free callback */
196 void *opaque; /**< Argument passed to the free callback */
201 * @b EXPERIMENTAL: this API may change without prior notice.
203 * Additional information about the mempool
205 * The structure is cache-line aligned to avoid ABI breakages in
206 * a number of cases when something small is added.
208 struct rte_mempool_info {
209 /** Number of objects in the contiguous block */
210 unsigned int contig_block_size;
211 } __rte_cache_aligned;
214 * The RTE mempool structure.
218 * Note: this field kept the RTE_MEMZONE_NAMESIZE size due to ABI
219 * compatibility requirements, it could be changed to
220 * RTE_MEMPOOL_NAMESIZE next time the ABI changes
222 char name[RTE_MEMZONE_NAMESIZE]; /**< Name of mempool. */
225 void *pool_data; /**< Ring or pool to store objects. */
226 uint64_t pool_id; /**< External mempool identifier. */
228 void *pool_config; /**< optional args for ops alloc. */
229 const struct rte_memzone *mz; /**< Memzone where pool is alloc'd. */
230 unsigned int flags; /**< Flags of the mempool. */
231 int socket_id; /**< Socket id passed at create. */
232 uint32_t size; /**< Max size of the mempool. */
234 /**< Size of per-lcore default local cache. */
236 uint32_t elt_size; /**< Size of an element. */
237 uint32_t header_size; /**< Size of header (before elt). */
238 uint32_t trailer_size; /**< Size of trailer (after elt). */
240 unsigned private_data_size; /**< Size of private data. */
242 * Index into rte_mempool_ops_table array of mempool ops
243 * structs, which contain callback function pointers.
244 * We're using an index here rather than pointers to the callbacks
245 * to facilitate any secondary processes that may want to use
250 struct rte_mempool_cache *local_cache; /**< Per-lcore local cache */
252 uint32_t populated_size; /**< Number of populated objects. */
253 struct rte_mempool_objhdr_list elt_list; /**< List of objects in pool */
254 uint32_t nb_mem_chunks; /**< Number of memory chunks */
255 struct rte_mempool_memhdr_list mem_list; /**< List of memory chunks */
257 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
258 /** Per-lcore statistics. */
259 struct rte_mempool_debug_stats stats[RTE_MAX_LCORE];
261 } __rte_cache_aligned;
263 #define MEMPOOL_F_NO_SPREAD 0x0001 /**< Do not spread among memory channels. */
264 #define MEMPOOL_F_NO_CACHE_ALIGN 0x0002 /**< Do not align objs on cache lines.*/
265 #define MEMPOOL_F_SP_PUT 0x0004 /**< Default put is "single-producer".*/
266 #define MEMPOOL_F_SC_GET 0x0008 /**< Default get is "single-consumer".*/
267 #define MEMPOOL_F_POOL_CREATED 0x0010 /**< Internal: pool is created. */
268 #define MEMPOOL_F_NO_IOVA_CONTIG 0x0020 /**< Don't need IOVA contiguous objs. */
269 #define MEMPOOL_F_NO_PHYS_CONTIG MEMPOOL_F_NO_IOVA_CONTIG /* deprecated */
272 * @internal When debug is enabled, store some statistics.
275 * Pointer to the memory pool.
277 * Name of the statistics field to increment in the memory pool.
279 * Number to add to the object-oriented statistics.
281 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
282 #define __MEMPOOL_STAT_ADD(mp, name, n) do { \
283 unsigned __lcore_id = rte_lcore_id(); \
284 if (__lcore_id < RTE_MAX_LCORE) { \
285 mp->stats[__lcore_id].name##_objs += n; \
286 mp->stats[__lcore_id].name##_bulk += 1; \
289 #define __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, name, n) do { \
290 unsigned int __lcore_id = rte_lcore_id(); \
291 if (__lcore_id < RTE_MAX_LCORE) { \
292 mp->stats[__lcore_id].name##_blks += n; \
293 mp->stats[__lcore_id].name##_bulk += 1; \
297 #define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
298 #define __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, name, n) do {} while (0)
302 * Calculate the size of the mempool header.
305 * Pointer to the memory pool.
307 * Size of the per-lcore cache.
309 #define MEMPOOL_HEADER_SIZE(mp, cs) \
310 (sizeof(*(mp)) + (((cs) == 0) ? 0 : \
311 (sizeof(struct rte_mempool_cache) * RTE_MAX_LCORE)))
313 /* return the header of a mempool object (internal) */
314 static inline struct rte_mempool_objhdr *__mempool_get_header(void *obj)
316 return (struct rte_mempool_objhdr *)RTE_PTR_SUB(obj,
317 sizeof(struct rte_mempool_objhdr));
321 * Return a pointer to the mempool owning this object.
324 * An object that is owned by a pool. If this is not the case,
325 * the behavior is undefined.
327 * A pointer to the mempool structure.
329 static inline struct rte_mempool *rte_mempool_from_obj(void *obj)
331 struct rte_mempool_objhdr *hdr = __mempool_get_header(obj);
335 /* return the trailer of a mempool object (internal) */
336 static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
338 struct rte_mempool *mp = rte_mempool_from_obj(obj);
339 return (struct rte_mempool_objtlr *)RTE_PTR_ADD(obj, mp->elt_size);
343 * @internal Check and update cookies or panic.
346 * Pointer to the memory pool.
347 * @param obj_table_const
348 * Pointer to a table of void * pointers (objects).
350 * Index of object in object table.
352 * - 0: object is supposed to be allocated, mark it as free
353 * - 1: object is supposed to be free, mark it as allocated
354 * - 2: just check that cookie is valid (free or allocated)
356 void rte_mempool_check_cookies(const struct rte_mempool *mp,
357 void * const *obj_table_const, unsigned n, int free);
359 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
360 #define __mempool_check_cookies(mp, obj_table_const, n, free) \
361 rte_mempool_check_cookies(mp, obj_table_const, n, free)
363 #define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0)
364 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
368 * @b EXPERIMENTAL: this API may change without prior notice.
370 * @internal Check contiguous object blocks and update cookies or panic.
373 * Pointer to the memory pool.
374 * @param first_obj_table_const
375 * Pointer to a table of void * pointers (first object of the contiguous
378 * Number of contiguous object blocks.
380 * - 0: object is supposed to be allocated, mark it as free
381 * - 1: object is supposed to be free, mark it as allocated
382 * - 2: just check that cookie is valid (free or allocated)
384 void rte_mempool_contig_blocks_check_cookies(const struct rte_mempool *mp,
385 void * const *first_obj_table_const, unsigned int n, int free);
387 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
388 #define __mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
390 rte_mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
393 #define __mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
396 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
398 #define RTE_MEMPOOL_OPS_NAMESIZE 32 /**< Max length of ops struct name. */
401 * Prototype for implementation specific data provisioning function.
403 * The function should provide the implementation specific memory for
404 * use by the other mempool ops functions in a given mempool ops struct.
405 * E.g. the default ops provides an instance of the rte_ring for this purpose.
406 * it will most likely point to a different type of data structure, and
407 * will be transparent to the application programmer.
408 * This function should set mp->pool_data.
410 typedef int (*rte_mempool_alloc_t)(struct rte_mempool *mp);
413 * Free the opaque private data pointed to by mp->pool_data pointer.
415 typedef void (*rte_mempool_free_t)(struct rte_mempool *mp);
418 * Enqueue an object into the external pool.
420 typedef int (*rte_mempool_enqueue_t)(struct rte_mempool *mp,
421 void * const *obj_table, unsigned int n);
424 * Dequeue an object from the external pool.
426 typedef int (*rte_mempool_dequeue_t)(struct rte_mempool *mp,
427 void **obj_table, unsigned int n);
431 * @b EXPERIMENTAL: this API may change without prior notice.
433 * Dequeue a number of contiguous object blocks from the external pool.
435 typedef int (*rte_mempool_dequeue_contig_blocks_t)(struct rte_mempool *mp,
436 void **first_obj_table, unsigned int n);
439 * Return the number of available objects in the external pool.
441 typedef unsigned (*rte_mempool_get_count)(const struct rte_mempool *mp);
444 * Calculate memory size required to store given number of objects.
446 * If mempool objects are not required to be IOVA-contiguous
447 * (the flag MEMPOOL_F_NO_IOVA_CONTIG is set), min_chunk_size defines
448 * virtually contiguous chunk size. Otherwise, if mempool objects must
449 * be IOVA-contiguous (the flag MEMPOOL_F_NO_IOVA_CONTIG is clear),
450 * min_chunk_size defines IOVA-contiguous chunk size.
453 * Pointer to the memory pool.
456 * @param[in] pg_shift
457 * LOG2 of the physical pages size. If set to 0, ignore page boundaries.
458 * @param[out] min_chunk_size
459 * Location for minimum size of the memory chunk which may be used to
460 * store memory pool objects.
462 * Location for required memory chunk alignment.
464 * Required memory size.
466 typedef ssize_t (*rte_mempool_calc_mem_size_t)(const struct rte_mempool *mp,
467 uint32_t obj_num, uint32_t pg_shift,
468 size_t *min_chunk_size, size_t *align);
472 * @b EXPERIMENTAL: this API may change without prior notice.
474 * @internal Helper to calculate memory size required to store given
477 * This function is internal to mempool library and mempool drivers.
479 * If page boundaries may be ignored, it is just a product of total
480 * object size including header and trailer and number of objects.
481 * Otherwise, it is a number of pages required to store given number of
482 * objects without crossing page boundary.
484 * Note that if object size is bigger than page size, then it assumes
485 * that pages are grouped in subsets of physically continuous pages big
486 * enough to store at least one object.
488 * Minimum size of memory chunk is the total element size.
489 * Required memory chunk alignment is the cache line size.
492 * A pointer to the mempool structure.
494 * Number of objects to be added in mempool.
495 * @param[in] pg_shift
496 * LOG2 of the physical pages size. If set to 0, ignore page boundaries.
497 * @param[in] chunk_reserve
498 * Amount of memory that must be reserved at the beginning of each page,
499 * or at the beginning of the memory area if pg_shift is 0.
500 * @param[out] min_chunk_size
501 * Location for minimum size of the memory chunk which may be used to
502 * store memory pool objects.
504 * Location for required memory chunk alignment.
506 * Required memory size.
509 ssize_t rte_mempool_op_calc_mem_size_helper(const struct rte_mempool *mp,
510 uint32_t obj_num, uint32_t pg_shift, size_t chunk_reserve,
511 size_t *min_chunk_size, size_t *align);
514 * Default way to calculate memory size required to store given number of
517 * Equivalent to rte_mempool_op_calc_mem_size_helper(mp, obj_num, pg_shift,
518 * 0, min_chunk_size, align).
520 ssize_t rte_mempool_op_calc_mem_size_default(const struct rte_mempool *mp,
521 uint32_t obj_num, uint32_t pg_shift,
522 size_t *min_chunk_size, size_t *align);
525 * Function to be called for each populated object.
528 * A pointer to the mempool structure.
530 * An opaque pointer passed to iterator.
532 * Object virtual address.
534 * Input/output virtual address of the object or RTE_BAD_IOVA.
536 typedef void (rte_mempool_populate_obj_cb_t)(struct rte_mempool *mp,
537 void *opaque, void *vaddr, rte_iova_t iova);
540 * Populate memory pool objects using provided memory chunk.
542 * Populated objects should be enqueued to the pool, e.g. using
543 * rte_mempool_ops_enqueue_bulk().
545 * If the given IO address is unknown (iova = RTE_BAD_IOVA),
546 * the chunk doesn't need to be physically contiguous (only virtually),
547 * and allocated objects may span two pages.
550 * A pointer to the mempool structure.
551 * @param[in] max_objs
552 * Maximum number of objects to be populated.
554 * The virtual address of memory that should be used to store objects.
558 * The length of memory in bytes.
560 * Callback function to be executed for each populated object.
561 * @param[in] obj_cb_arg
562 * An opaque pointer passed to the callback function.
564 * The number of objects added on success.
565 * On error, no objects are populated and a negative errno is returned.
567 typedef int (*rte_mempool_populate_t)(struct rte_mempool *mp,
568 unsigned int max_objs,
569 void *vaddr, rte_iova_t iova, size_t len,
570 rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg);
573 * Align objects on addresses multiple of total_elt_sz.
575 #define RTE_MEMPOOL_POPULATE_F_ALIGN_OBJ 0x0001
579 * @b EXPERIMENTAL: this API may change without prior notice.
581 * @internal Helper to populate memory pool object using provided memory
582 * chunk: just slice objects one by one, taking care of not
583 * crossing page boundaries.
585 * If RTE_MEMPOOL_POPULATE_F_ALIGN_OBJ is set in flags, the addresses
586 * of object headers will be aligned on a multiple of total_elt_sz.
587 * This feature is used by octeontx hardware.
589 * This function is internal to mempool library and mempool drivers.
592 * A pointer to the mempool structure.
594 * Logical OR of following flags:
595 * - RTE_MEMPOOL_POPULATE_F_ALIGN_OBJ: align objects on addresses
596 * multiple of total_elt_sz.
597 * @param[in] max_objs
598 * Maximum number of objects to be added in mempool.
600 * The virtual address of memory that should be used to store objects.
602 * The IO address corresponding to vaddr, or RTE_BAD_IOVA.
604 * The length of memory in bytes.
606 * Callback function to be executed for each populated object.
607 * @param[in] obj_cb_arg
608 * An opaque pointer passed to the callback function.
610 * The number of objects added in mempool.
613 int rte_mempool_op_populate_helper(struct rte_mempool *mp,
614 unsigned int flags, unsigned int max_objs,
615 void *vaddr, rte_iova_t iova, size_t len,
616 rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg);
619 * Default way to populate memory pool object using provided memory chunk.
621 * Equivalent to rte_mempool_op_populate_helper(mp, 0, max_objs, vaddr, iova,
622 * len, obj_cb, obj_cb_arg).
624 int rte_mempool_op_populate_default(struct rte_mempool *mp,
625 unsigned int max_objs,
626 void *vaddr, rte_iova_t iova, size_t len,
627 rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg);
631 * @b EXPERIMENTAL: this API may change without prior notice.
633 * Get some additional information about a mempool.
635 typedef int (*rte_mempool_get_info_t)(const struct rte_mempool *mp,
636 struct rte_mempool_info *info);
639 /** Structure defining mempool operations structure */
640 struct rte_mempool_ops {
641 char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */
642 rte_mempool_alloc_t alloc; /**< Allocate private data. */
643 rte_mempool_free_t free; /**< Free the external pool. */
644 rte_mempool_enqueue_t enqueue; /**< Enqueue an object. */
645 rte_mempool_dequeue_t dequeue; /**< Dequeue an object. */
646 rte_mempool_get_count get_count; /**< Get qty of available objs. */
648 * Optional callback to calculate memory size required to
649 * store specified number of objects.
651 rte_mempool_calc_mem_size_t calc_mem_size;
653 * Optional callback to populate mempool objects using
654 * provided memory chunk.
656 rte_mempool_populate_t populate;
660 rte_mempool_get_info_t get_info;
662 * Dequeue a number of contiguous object blocks.
664 rte_mempool_dequeue_contig_blocks_t dequeue_contig_blocks;
665 } __rte_cache_aligned;
667 #define RTE_MEMPOOL_MAX_OPS_IDX 16 /**< Max registered ops structs */
670 * Structure storing the table of registered ops structs, each of which contain
671 * the function pointers for the mempool ops functions.
672 * Each process has its own storage for this ops struct array so that
673 * the mempools can be shared across primary and secondary processes.
674 * The indices used to access the array are valid across processes, whereas
675 * any function pointers stored directly in the mempool struct would not be.
676 * This results in us simply having "ops_index" in the mempool struct.
678 struct rte_mempool_ops_table {
679 rte_spinlock_t sl; /**< Spinlock for add/delete. */
680 uint32_t num_ops; /**< Number of used ops structs in the table. */
682 * Storage for all possible ops structs.
684 struct rte_mempool_ops ops[RTE_MEMPOOL_MAX_OPS_IDX];
685 } __rte_cache_aligned;
687 /** Array of registered ops structs. */
688 extern struct rte_mempool_ops_table rte_mempool_ops_table;
691 * @internal Get the mempool ops struct from its index.
694 * The index of the ops struct in the ops struct table. It must be a valid
695 * index: (0 <= idx < num_ops).
697 * The pointer to the ops struct in the table.
699 static inline struct rte_mempool_ops *
700 rte_mempool_get_ops(int ops_index)
702 RTE_VERIFY((ops_index >= 0) && (ops_index < RTE_MEMPOOL_MAX_OPS_IDX));
704 return &rte_mempool_ops_table.ops[ops_index];
708 * @internal Wrapper for mempool_ops alloc callback.
711 * Pointer to the memory pool.
713 * - 0: Success; successfully allocated mempool pool_data.
714 * - <0: Error; code of alloc function.
717 rte_mempool_ops_alloc(struct rte_mempool *mp);
720 * @internal Wrapper for mempool_ops dequeue callback.
723 * Pointer to the memory pool.
725 * Pointer to a table of void * pointers (objects).
727 * Number of objects to get.
729 * - 0: Success; got n objects.
730 * - <0: Error; code of dequeue function.
733 rte_mempool_ops_dequeue_bulk(struct rte_mempool *mp,
734 void **obj_table, unsigned n)
736 struct rte_mempool_ops *ops;
738 ops = rte_mempool_get_ops(mp->ops_index);
739 return ops->dequeue(mp, obj_table, n);
743 * @internal Wrapper for mempool_ops dequeue_contig_blocks callback.
746 * Pointer to the memory pool.
747 * @param[out] first_obj_table
748 * Pointer to a table of void * pointers (first objects).
750 * Number of blocks to get.
752 * - 0: Success; got n objects.
753 * - <0: Error; code of dequeue function.
756 rte_mempool_ops_dequeue_contig_blocks(struct rte_mempool *mp,
757 void **first_obj_table, unsigned int n)
759 struct rte_mempool_ops *ops;
761 ops = rte_mempool_get_ops(mp->ops_index);
762 RTE_ASSERT(ops->dequeue_contig_blocks != NULL);
763 return ops->dequeue_contig_blocks(mp, first_obj_table, n);
767 * @internal wrapper for mempool_ops enqueue callback.
770 * Pointer to the memory pool.
772 * Pointer to a table of void * pointers (objects).
774 * Number of objects to put.
776 * - 0: Success; n objects supplied.
777 * - <0: Error; code of enqueue function.
780 rte_mempool_ops_enqueue_bulk(struct rte_mempool *mp, void * const *obj_table,
783 struct rte_mempool_ops *ops;
785 ops = rte_mempool_get_ops(mp->ops_index);
786 return ops->enqueue(mp, obj_table, n);
790 * @internal wrapper for mempool_ops get_count callback.
793 * Pointer to the memory pool.
795 * The number of available objects in the external pool.
798 rte_mempool_ops_get_count(const struct rte_mempool *mp);
801 * @internal wrapper for mempool_ops calc_mem_size callback.
802 * API to calculate size of memory required to store specified number of
806 * Pointer to the memory pool.
809 * @param[in] pg_shift
810 * LOG2 of the physical pages size. If set to 0, ignore page boundaries.
811 * @param[out] min_chunk_size
812 * Location for minimum size of the memory chunk which may be used to
813 * store memory pool objects.
815 * Location for required memory chunk alignment.
817 * Required memory size aligned at page boundary.
819 ssize_t rte_mempool_ops_calc_mem_size(const struct rte_mempool *mp,
820 uint32_t obj_num, uint32_t pg_shift,
821 size_t *min_chunk_size, size_t *align);
824 * @internal wrapper for mempool_ops populate callback.
826 * Populate memory pool objects using provided memory chunk.
829 * A pointer to the mempool structure.
830 * @param[in] max_objs
831 * Maximum number of objects to be populated.
833 * The virtual address of memory that should be used to store objects.
837 * The length of memory in bytes.
839 * Callback function to be executed for each populated object.
840 * @param[in] obj_cb_arg
841 * An opaque pointer passed to the callback function.
843 * The number of objects added on success.
844 * On error, no objects are populated and a negative errno is returned.
846 int rte_mempool_ops_populate(struct rte_mempool *mp, unsigned int max_objs,
847 void *vaddr, rte_iova_t iova, size_t len,
848 rte_mempool_populate_obj_cb_t *obj_cb,
853 * @b EXPERIMENTAL: this API may change without prior notice.
855 * Wrapper for mempool_ops get_info callback.
858 * Pointer to the memory pool.
860 * Pointer to the rte_mempool_info structure
862 * - 0: Success; The mempool driver supports retrieving supplementary
863 * mempool information
864 * - -ENOTSUP - doesn't support get_info ops (valid case).
867 int rte_mempool_ops_get_info(const struct rte_mempool *mp,
868 struct rte_mempool_info *info);
871 * @internal wrapper for mempool_ops free callback.
874 * Pointer to the memory pool.
877 rte_mempool_ops_free(struct rte_mempool *mp);
880 * Set the ops of a mempool.
882 * This can only be done on a mempool that is not populated, i.e. just after
883 * a call to rte_mempool_create_empty().
886 * Pointer to the memory pool.
888 * Name of the ops structure to use for this mempool.
890 * Opaque data that can be passed by the application to the ops functions.
892 * - 0: Success; the mempool is now using the requested ops functions.
893 * - -EINVAL - Invalid ops struct name provided.
894 * - -EEXIST - mempool already has an ops struct assigned.
897 rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,
901 * Register mempool operations.
904 * Pointer to an ops structure to register.
906 * - >=0: Success; return the index of the ops struct in the table.
907 * - -EINVAL - some missing callbacks while registering ops struct.
908 * - -ENOSPC - the maximum number of ops structs has been reached.
910 int rte_mempool_register_ops(const struct rte_mempool_ops *ops);
913 * Macro to statically register the ops of a mempool handler.
914 * Note that the rte_mempool_register_ops fails silently here when
915 * more than RTE_MEMPOOL_MAX_OPS_IDX is registered.
917 #define MEMPOOL_REGISTER_OPS(ops) \
918 RTE_INIT(mp_hdlr_init_##ops) \
920 rte_mempool_register_ops(&ops); \
924 * An object callback function for mempool.
926 * Used by rte_mempool_create() and rte_mempool_obj_iter().
928 typedef void (rte_mempool_obj_cb_t)(struct rte_mempool *mp,
929 void *opaque, void *obj, unsigned obj_idx);
930 typedef rte_mempool_obj_cb_t rte_mempool_obj_ctor_t; /* compat */
933 * A memory callback function for mempool.
935 * Used by rte_mempool_mem_iter().
937 typedef void (rte_mempool_mem_cb_t)(struct rte_mempool *mp,
938 void *opaque, struct rte_mempool_memhdr *memhdr,
942 * A mempool constructor callback function.
944 * Arguments are the mempool and the opaque pointer given by the user in
945 * rte_mempool_create().
947 typedef void (rte_mempool_ctor_t)(struct rte_mempool *, void *);
950 * Create a new mempool named *name* in memory.
952 * This function uses ``rte_memzone_reserve()`` to allocate memory. The
953 * pool contains n elements of elt_size. Its size is set to n.
956 * The name of the mempool.
958 * The number of elements in the mempool. The optimum size (in terms of
959 * memory usage) for a mempool is when n is a power of two minus one:
962 * The size of each element.
964 * If cache_size is non-zero, the rte_mempool library will try to
965 * limit the accesses to the common lockless pool, by maintaining a
966 * per-lcore object cache. This argument must be lower or equal to
967 * CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE and n / 1.5. It is advised to choose
968 * cache_size to have "n modulo cache_size == 0": if this is
969 * not the case, some elements will always stay in the pool and will
970 * never be used. The access to the per-lcore table is of course
971 * faster than the multi-producer/consumer pool. The cache can be
972 * disabled if the cache_size argument is set to 0; it can be useful to
973 * avoid losing objects in cache.
974 * @param private_data_size
975 * The size of the private data appended after the mempool
976 * structure. This is useful for storing some private data after the
977 * mempool structure, as is done for rte_mbuf_pool for example.
979 * A function pointer that is called for initialization of the pool,
980 * before object initialization. The user can initialize the private
981 * data in this function if needed. This parameter can be NULL if
984 * An opaque pointer to data that can be used in the mempool
985 * constructor function.
987 * A function pointer that is called for each object at
988 * initialization of the pool. The user can set some meta data in
989 * objects if needed. This parameter can be NULL if not needed.
990 * The obj_init() function takes the mempool pointer, the init_arg,
991 * the object pointer and the object number as parameters.
992 * @param obj_init_arg
993 * An opaque pointer to data that can be used as an argument for
994 * each call to the object constructor function.
996 * The *socket_id* argument is the socket identifier in the case of
997 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
998 * constraint for the reserved zone.
1000 * The *flags* arguments is an OR of following flags:
1001 * - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
1002 * between channels in RAM: the pool allocator will add padding
1003 * between objects depending on the hardware configuration. See
1004 * Memory alignment constraints for details. If this flag is set,
1005 * the allocator will just align them to a cache line.
1006 * - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
1007 * cache-aligned. This flag removes this constraint, and no
1008 * padding will be present between objects. This flag implies
1009 * MEMPOOL_F_NO_SPREAD.
1010 * - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
1011 * when using rte_mempool_put() or rte_mempool_put_bulk() is
1012 * "single-producer". Otherwise, it is "multi-producers".
1013 * - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
1014 * when using rte_mempool_get() or rte_mempool_get_bulk() is
1015 * "single-consumer". Otherwise, it is "multi-consumers".
1016 * - MEMPOOL_F_NO_IOVA_CONTIG: If set, allocated objects won't
1017 * necessarily be contiguous in IO memory.
1019 * The pointer to the new allocated mempool, on success. NULL on error
1020 * with rte_errno set appropriately. Possible rte_errno values include:
1021 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
1022 * - E_RTE_SECONDARY - function was called from a secondary process instance
1023 * - EINVAL - cache size provided is too large
1024 * - ENOSPC - the maximum number of memzones has already been allocated
1025 * - EEXIST - a memzone with the same name already exists
1026 * - ENOMEM - no appropriate memory area found in which to create memzone
1028 struct rte_mempool *
1029 rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
1030 unsigned cache_size, unsigned private_data_size,
1031 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
1032 rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
1033 int socket_id, unsigned flags);
1036 * Create an empty mempool
1038 * The mempool is allocated and initialized, but it is not populated: no
1039 * memory is allocated for the mempool elements. The user has to call
1040 * rte_mempool_populate_*() to add memory chunks to the pool. Once
1041 * populated, the user may also want to initialize each object with
1042 * rte_mempool_obj_iter().
1045 * The name of the mempool.
1047 * The maximum number of elements that can be added in the mempool.
1048 * The optimum size (in terms of memory usage) for a mempool is when n
1049 * is a power of two minus one: n = (2^q - 1).
1051 * The size of each element.
1053 * Size of the cache. See rte_mempool_create() for details.
1054 * @param private_data_size
1055 * The size of the private data appended after the mempool
1056 * structure. This is useful for storing some private data after the
1057 * mempool structure, as is done for rte_mbuf_pool for example.
1059 * The *socket_id* argument is the socket identifier in the case of
1060 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
1061 * constraint for the reserved zone.
1063 * Flags controlling the behavior of the mempool. See
1064 * rte_mempool_create() for details.
1066 * The pointer to the new allocated mempool, on success. NULL on error
1067 * with rte_errno set appropriately. See rte_mempool_create() for details.
1069 struct rte_mempool *
1070 rte_mempool_create_empty(const char *name, unsigned n, unsigned elt_size,
1071 unsigned cache_size, unsigned private_data_size,
1072 int socket_id, unsigned flags);
1076 * Unlink the mempool from global list, free the memory chunks, and all
1077 * memory referenced by the mempool. The objects must not be used by
1078 * other cores as they will be freed.
1081 * A pointer to the mempool structure.
1084 rte_mempool_free(struct rte_mempool *mp);
1087 * Add physically contiguous memory for objects in the pool at init
1089 * Add a virtually and physically contiguous memory chunk in the pool
1090 * where objects can be instantiated.
1092 * If the given IO address is unknown (iova = RTE_BAD_IOVA),
1093 * the chunk doesn't need to be physically contiguous (only virtually),
1094 * and allocated objects may span two pages.
1097 * A pointer to the mempool structure.
1099 * The virtual address of memory that should be used to store objects.
1103 * The length of memory in bytes.
1105 * The callback used to free this chunk when destroying the mempool.
1107 * An opaque argument passed to free_cb.
1109 * The number of objects added on success.
1110 * On error, the chunk is not added in the memory list of the
1111 * mempool and a negative errno is returned.
1113 int rte_mempool_populate_iova(struct rte_mempool *mp, char *vaddr,
1114 rte_iova_t iova, size_t len, rte_mempool_memchunk_free_cb_t *free_cb,
1118 * Add virtually contiguous memory for objects in the pool at init
1120 * Add a virtually contiguous memory chunk in the pool where objects can
1124 * A pointer to the mempool structure.
1126 * The virtual address of memory that should be used to store objects.
1128 * The length of memory in bytes.
1130 * The size of memory pages in this virtual area.
1132 * The callback used to free this chunk when destroying the mempool.
1134 * An opaque argument passed to free_cb.
1136 * The number of objects added on success.
1137 * On error, the chunk is not added in the memory list of the
1138 * mempool and a negative errno is returned.
1141 rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
1142 size_t len, size_t pg_sz, rte_mempool_memchunk_free_cb_t *free_cb,
1146 * Add memory for objects in the pool at init
1148 * This is the default function used by rte_mempool_create() to populate
1149 * the mempool. It adds memory allocated using rte_memzone_reserve().
1152 * A pointer to the mempool structure.
1154 * The number of objects added on success.
1155 * On error, the chunk is not added in the memory list of the
1156 * mempool and a negative errno is returned.
1158 int rte_mempool_populate_default(struct rte_mempool *mp);
1161 * Add memory from anonymous mapping for objects in the pool at init
1163 * This function mmap an anonymous memory zone that is locked in
1164 * memory to store the objects of the mempool.
1167 * A pointer to the mempool structure.
1169 * The number of objects added on success.
1170 * On error, the chunk is not added in the memory list of the
1171 * mempool and a negative errno is returned.
1173 int rte_mempool_populate_anon(struct rte_mempool *mp);
1176 * Call a function for each mempool element
1178 * Iterate across all objects attached to a rte_mempool and call the
1179 * callback function on it.
1182 * A pointer to an initialized mempool.
1184 * A function pointer that is called for each object.
1186 * An opaque pointer passed to the callback function.
1188 * Number of objects iterated.
1190 uint32_t rte_mempool_obj_iter(struct rte_mempool *mp,
1191 rte_mempool_obj_cb_t *obj_cb, void *obj_cb_arg);
1194 * Call a function for each mempool memory chunk
1196 * Iterate across all memory chunks attached to a rte_mempool and call
1197 * the callback function on it.
1200 * A pointer to an initialized mempool.
1202 * A function pointer that is called for each memory chunk.
1204 * An opaque pointer passed to the callback function.
1206 * Number of memory chunks iterated.
1208 uint32_t rte_mempool_mem_iter(struct rte_mempool *mp,
1209 rte_mempool_mem_cb_t *mem_cb, void *mem_cb_arg);
1212 * Dump the status of the mempool to a file.
1215 * A pointer to a file for output
1217 * A pointer to the mempool structure.
1219 void rte_mempool_dump(FILE *f, struct rte_mempool *mp);
1222 * Create a user-owned mempool cache.
1224 * This can be used by non-EAL threads to enable caching when they
1225 * interact with a mempool.
1228 * The size of the mempool cache. See rte_mempool_create()'s cache_size
1229 * parameter description for more information. The same limits and
1230 * considerations apply here too.
1232 * The socket identifier in the case of NUMA. The value can be
1233 * SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone.
1235 struct rte_mempool_cache *
1236 rte_mempool_cache_create(uint32_t size, int socket_id);
1239 * Free a user-owned mempool cache.
1242 * A pointer to the mempool cache.
1245 rte_mempool_cache_free(struct rte_mempool_cache *cache);
1248 * Get a pointer to the per-lcore default mempool cache.
1251 * A pointer to the mempool structure.
1253 * The logical core id.
1255 * A pointer to the mempool cache or NULL if disabled or non-EAL thread.
1257 static __rte_always_inline struct rte_mempool_cache *
1258 rte_mempool_default_cache(struct rte_mempool *mp, unsigned lcore_id)
1260 if (mp->cache_size == 0)
1263 if (lcore_id >= RTE_MAX_LCORE)
1266 return &mp->local_cache[lcore_id];
1270 * Flush a user-owned mempool cache to the specified mempool.
1273 * A pointer to the mempool cache.
1275 * A pointer to the mempool.
1277 static __rte_always_inline void
1278 rte_mempool_cache_flush(struct rte_mempool_cache *cache,
1279 struct rte_mempool *mp)
1282 cache = rte_mempool_default_cache(mp, rte_lcore_id());
1283 if (cache == NULL || cache->len == 0)
1285 rte_mempool_ops_enqueue_bulk(mp, cache->objs, cache->len);
1290 * @internal Put several objects back in the mempool; used internally.
1292 * A pointer to the mempool structure.
1294 * A pointer to a table of void * pointers (objects).
1296 * The number of objects to store back in the mempool, must be strictly
1299 * A pointer to a mempool cache structure. May be NULL if not needed.
1301 static __rte_always_inline void
1302 __mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
1303 unsigned int n, struct rte_mempool_cache *cache)
1307 /* increment stat now, adding in mempool always success */
1308 __MEMPOOL_STAT_ADD(mp, put, n);
1310 /* No cache provided or if put would overflow mem allocated for cache */
1311 if (unlikely(cache == NULL || n > RTE_MEMPOOL_CACHE_MAX_SIZE))
1314 cache_objs = &cache->objs[cache->len];
1317 * The cache follows the following algorithm
1318 * 1. Add the objects to the cache
1319 * 2. Anything greater than the cache min value (if it crosses the
1320 * cache flush threshold) is flushed to the ring.
1323 /* Add elements back into the cache */
1324 rte_memcpy(&cache_objs[0], obj_table, sizeof(void *) * n);
1328 if (cache->len >= cache->flushthresh) {
1329 rte_mempool_ops_enqueue_bulk(mp, &cache->objs[cache->size],
1330 cache->len - cache->size);
1331 cache->len = cache->size;
1338 /* push remaining objects in ring */
1339 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
1340 if (rte_mempool_ops_enqueue_bulk(mp, obj_table, n) < 0)
1341 rte_panic("cannot put objects in mempool\n");
1343 rte_mempool_ops_enqueue_bulk(mp, obj_table, n);
1349 * Put several objects back in the mempool.
1352 * A pointer to the mempool structure.
1354 * A pointer to a table of void * pointers (objects).
1356 * The number of objects to add in the mempool from the obj_table.
1358 * A pointer to a mempool cache structure. May be NULL if not needed.
1360 static __rte_always_inline void
1361 rte_mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
1362 unsigned int n, struct rte_mempool_cache *cache)
1364 __mempool_check_cookies(mp, obj_table, n, 0);
1365 __mempool_generic_put(mp, obj_table, n, cache);
1369 * Put several objects back in the mempool.
1371 * This function calls the multi-producer or the single-producer
1372 * version depending on the default behavior that was specified at
1373 * mempool creation time (see flags).
1376 * A pointer to the mempool structure.
1378 * A pointer to a table of void * pointers (objects).
1380 * The number of objects to add in the mempool from obj_table.
1382 static __rte_always_inline void
1383 rte_mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
1386 struct rte_mempool_cache *cache;
1387 cache = rte_mempool_default_cache(mp, rte_lcore_id());
1388 rte_mempool_generic_put(mp, obj_table, n, cache);
1392 * Put one object back in the mempool.
1394 * This function calls the multi-producer or the single-producer
1395 * version depending on the default behavior that was specified at
1396 * mempool creation time (see flags).
1399 * A pointer to the mempool structure.
1401 * A pointer to the object to be added.
1403 static __rte_always_inline void
1404 rte_mempool_put(struct rte_mempool *mp, void *obj)
1406 rte_mempool_put_bulk(mp, &obj, 1);
1410 * @internal Get several objects from the mempool; used internally.
1412 * A pointer to the mempool structure.
1414 * A pointer to a table of void * pointers (objects).
1416 * The number of objects to get, must be strictly positive.
1418 * A pointer to a mempool cache structure. May be NULL if not needed.
1420 * - >=0: Success; number of objects supplied.
1421 * - <0: Error; code of ring dequeue function.
1423 static __rte_always_inline int
1424 __mempool_generic_get(struct rte_mempool *mp, void **obj_table,
1425 unsigned int n, struct rte_mempool_cache *cache)
1428 uint32_t index, len;
1431 /* No cache provided or cannot be satisfied from cache */
1432 if (unlikely(cache == NULL || n >= cache->size))
1435 cache_objs = cache->objs;
1437 /* Can this be satisfied from the cache? */
1438 if (cache->len < n) {
1439 /* No. Backfill the cache first, and then fill from it */
1440 uint32_t req = n + (cache->size - cache->len);
1442 /* How many do we require i.e. number to fill the cache + the request */
1443 ret = rte_mempool_ops_dequeue_bulk(mp,
1444 &cache->objs[cache->len], req);
1445 if (unlikely(ret < 0)) {
1447 * In the off chance that we are buffer constrained,
1448 * where we are not able to allocate cache + n, go to
1449 * the ring directly. If that fails, we are truly out of
1458 /* Now fill in the response ... */
1459 for (index = 0, len = cache->len - 1; index < n; ++index, len--, obj_table++)
1460 *obj_table = cache_objs[len];
1464 __MEMPOOL_STAT_ADD(mp, get_success, n);
1470 /* get remaining objects from ring */
1471 ret = rte_mempool_ops_dequeue_bulk(mp, obj_table, n);
1474 __MEMPOOL_STAT_ADD(mp, get_fail, n);
1476 __MEMPOOL_STAT_ADD(mp, get_success, n);
1482 * Get several objects from the mempool.
1484 * If cache is enabled, objects will be retrieved first from cache,
1485 * subsequently from the common pool. Note that it can return -ENOENT when
1486 * the local cache and common pool are empty, even if cache from other
1490 * A pointer to the mempool structure.
1492 * A pointer to a table of void * pointers (objects) that will be filled.
1494 * The number of objects to get from mempool to obj_table.
1496 * A pointer to a mempool cache structure. May be NULL if not needed.
1498 * - 0: Success; objects taken.
1499 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1501 static __rte_always_inline int
1502 rte_mempool_generic_get(struct rte_mempool *mp, void **obj_table,
1503 unsigned int n, struct rte_mempool_cache *cache)
1506 ret = __mempool_generic_get(mp, obj_table, n, cache);
1508 __mempool_check_cookies(mp, obj_table, n, 1);
1513 * Get several objects from the mempool.
1515 * This function calls the multi-consumers or the single-consumer
1516 * version, depending on the default behaviour that was specified at
1517 * mempool creation time (see flags).
1519 * If cache is enabled, objects will be retrieved first from cache,
1520 * subsequently from the common pool. Note that it can return -ENOENT when
1521 * the local cache and common pool are empty, even if cache from other
1525 * A pointer to the mempool structure.
1527 * A pointer to a table of void * pointers (objects) that will be filled.
1529 * The number of objects to get from the mempool to obj_table.
1531 * - 0: Success; objects taken
1532 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1534 static __rte_always_inline int
1535 rte_mempool_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned int n)
1537 struct rte_mempool_cache *cache;
1538 cache = rte_mempool_default_cache(mp, rte_lcore_id());
1539 return rte_mempool_generic_get(mp, obj_table, n, cache);
1543 * Get one object from the mempool.
1545 * This function calls the multi-consumers or the single-consumer
1546 * version, depending on the default behavior that was specified at
1547 * mempool creation (see flags).
1549 * If cache is enabled, objects will be retrieved first from cache,
1550 * subsequently from the common pool. Note that it can return -ENOENT when
1551 * the local cache and common pool are empty, even if cache from other
1555 * A pointer to the mempool structure.
1557 * A pointer to a void * pointer (object) that will be filled.
1559 * - 0: Success; objects taken.
1560 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1562 static __rte_always_inline int
1563 rte_mempool_get(struct rte_mempool *mp, void **obj_p)
1565 return rte_mempool_get_bulk(mp, obj_p, 1);
1570 * @b EXPERIMENTAL: this API may change without prior notice.
1572 * Get a contiguous blocks of objects from the mempool.
1574 * If cache is enabled, consider to flush it first, to reuse objects
1575 * as soon as possible.
1577 * The application should check that the driver supports the operation
1578 * by calling rte_mempool_ops_get_info() and checking that `contig_block_size`
1582 * A pointer to the mempool structure.
1583 * @param first_obj_table
1584 * A pointer to a pointer to the first object in each block.
1586 * The number of blocks to get from mempool.
1588 * - 0: Success; blocks taken.
1589 * - -ENOBUFS: Not enough entries in the mempool; no object is retrieved.
1590 * - -EOPNOTSUPP: The mempool driver does not support block dequeue
1592 static __rte_always_inline int
1594 rte_mempool_get_contig_blocks(struct rte_mempool *mp,
1595 void **first_obj_table, unsigned int n)
1599 ret = rte_mempool_ops_dequeue_contig_blocks(mp, first_obj_table, n);
1601 __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, get_success, n);
1602 __mempool_contig_blocks_check_cookies(mp, first_obj_table, n,
1605 __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, get_fail, n);
1612 * Return the number of entries in the mempool.
1614 * When cache is enabled, this function has to browse the length of
1615 * all lcores, so it should not be used in a data path, but only for
1616 * debug purposes. User-owned mempool caches are not accounted for.
1619 * A pointer to the mempool structure.
1621 * The number of entries in the mempool.
1623 unsigned int rte_mempool_avail_count(const struct rte_mempool *mp);
1626 * Return the number of elements which have been allocated from the mempool
1628 * When cache is enabled, this function has to browse the length of
1629 * all lcores, so it should not be used in a data path, but only for
1633 * A pointer to the mempool structure.
1635 * The number of free entries in the mempool.
1638 rte_mempool_in_use_count(const struct rte_mempool *mp);
1641 * Test if the mempool is full.
1643 * When cache is enabled, this function has to browse the length of all
1644 * lcores, so it should not be used in a data path, but only for debug
1645 * purposes. User-owned mempool caches are not accounted for.
1648 * A pointer to the mempool structure.
1650 * - 1: The mempool is full.
1651 * - 0: The mempool is not full.
1654 rte_mempool_full(const struct rte_mempool *mp)
1656 return !!(rte_mempool_avail_count(mp) == mp->size);
1660 * Test if the mempool is empty.
1662 * When cache is enabled, this function has to browse the length of all
1663 * lcores, so it should not be used in a data path, but only for debug
1664 * purposes. User-owned mempool caches are not accounted for.
1667 * A pointer to the mempool structure.
1669 * - 1: The mempool is empty.
1670 * - 0: The mempool is not empty.
1673 rte_mempool_empty(const struct rte_mempool *mp)
1675 return !!(rte_mempool_avail_count(mp) == 0);
1679 * Return the IO address of elt, which is an element of the pool mp.
1682 * A pointer (virtual address) to the element of the pool.
1684 * The IO address of the elt element.
1685 * If the mempool was created with MEMPOOL_F_NO_IOVA_CONTIG, the
1686 * returned value is RTE_BAD_IOVA.
1688 static inline rte_iova_t
1689 rte_mempool_virt2iova(const void *elt)
1691 const struct rte_mempool_objhdr *hdr;
1692 hdr = (const struct rte_mempool_objhdr *)RTE_PTR_SUB(elt,
1698 * Check the consistency of mempool objects.
1700 * Verify the coherency of fields in the mempool structure. Also check
1701 * that the cookies of mempool objects (even the ones that are not
1702 * present in pool) have a correct value. If not, a panic will occur.
1705 * A pointer to the mempool structure.
1707 void rte_mempool_audit(struct rte_mempool *mp);
1710 * Return a pointer to the private data in an mempool structure.
1713 * A pointer to the mempool structure.
1715 * A pointer to the private data.
1717 static inline void *rte_mempool_get_priv(struct rte_mempool *mp)
1720 MEMPOOL_HEADER_SIZE(mp, mp->cache_size);
1724 * Dump the status of all mempools on the console
1727 * A pointer to a file for output
1729 void rte_mempool_list_dump(FILE *f);
1732 * Search a mempool from its name
1735 * The name of the mempool.
1737 * The pointer to the mempool matching the name, or NULL if not found.
1739 * with rte_errno set appropriately. Possible rte_errno values include:
1740 * - ENOENT - required entry not available to return.
1743 struct rte_mempool *rte_mempool_lookup(const char *name);
1746 * Get the header, trailer and total size of a mempool element.
1748 * Given a desired size of the mempool element and mempool flags,
1749 * calculates header, trailer, body and total sizes of the mempool object.
1752 * The size of each element, without header and trailer.
1754 * The flags used for the mempool creation.
1755 * Consult rte_mempool_create() for more information about possible values.
1756 * The size of each element.
1758 * The calculated detailed size the mempool object. May be NULL.
1760 * Total size of the mempool object.
1762 uint32_t rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
1763 struct rte_mempool_objsz *sz);
1766 * Walk list of all memory pools
1771 * Argument passed to iterator
1773 void rte_mempool_walk(void (*func)(struct rte_mempool *, void *arg),
1778 * @b EXPERIMENTAL: this API may change without prior notice.
1780 * @internal Get page size used for mempool object allocation.
1781 * This function is internal to mempool library and mempool drivers.
1785 rte_mempool_get_page_size(struct rte_mempool *mp, size_t *pg_sz);
1791 #endif /* _RTE_MEMPOOL_H_ */