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34 #ifndef _RTE_MEMPOOL_H_
35 #define _RTE_MEMPOOL_H_
41 * A memory pool is an allocator of fixed-size object. It is
42 * identified by its name, and uses a ring to store free objects. It
43 * provides some other optional services, like a per-core object
44 * cache, and an alignment helper to ensure that objects are padded
45 * to spread them equally on all RAM channels, ranks, and so on.
47 * Objects owned by a mempool should never be added in another
48 * mempool. When an object is freed using rte_mempool_put() or
49 * equivalent, the object data is not modified; the user can save some
50 * meta-data in the object data and retrieve them when allocating a
53 * Note: the mempool implementation is not preemptable. A lcore must
54 * not be interrupted by another task that uses the same mempool
55 * (because it uses a ring which is not preemptable). Also, mempool
56 * functions must not be used outside the DPDK environment: for
57 * example, in linuxapp environment, a thread that is not created by
58 * the EAL must not use mempools. This is due to the per-lcore cache
59 * that won't work as rte_lcore_id() will not return a correct value.
67 #include <sys/queue.h>
70 #include <rte_debug.h>
71 #include <rte_lcore.h>
72 #include <rte_memory.h>
73 #include <rte_branch_prediction.h>
80 #define RTE_MEMPOOL_HEADER_COOKIE1 0xbadbadbadadd2e55ULL /**< Header cookie. */
81 #define RTE_MEMPOOL_HEADER_COOKIE2 0xf2eef2eedadd2e55ULL /**< Header cookie. */
82 #define RTE_MEMPOOL_TRAILER_COOKIE 0xadd2e55badbadbadULL /**< Trailer cookie.*/
84 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
86 * A structure that stores the mempool statistics (per-lcore).
88 struct rte_mempool_debug_stats {
89 uint64_t put_bulk; /**< Number of puts. */
90 uint64_t put_objs; /**< Number of objects successfully put. */
91 uint64_t get_success_bulk; /**< Successful allocation number. */
92 uint64_t get_success_objs; /**< Objects successfully allocated. */
93 uint64_t get_fail_bulk; /**< Failed allocation number. */
94 uint64_t get_fail_objs; /**< Objects that failed to be allocated. */
95 } __rte_cache_aligned;
98 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
100 * A structure that stores a per-core object cache.
102 struct rte_mempool_cache {
103 unsigned len; /**< Cache len */
105 * Cache is allocated to this size to allow it to overflow in certain
106 * cases to avoid needless emptying of cache.
108 void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
109 } __rte_cache_aligned;
110 #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
112 struct rte_mempool_objsz {
113 uint32_t elt_size; /**< Size of an element. */
114 uint32_t header_size; /**< Size of header (before elt). */
115 uint32_t trailer_size; /**< Size of trailer (after elt). */
117 /**< Total size of an object (header + elt + trailer). */
120 #define RTE_MEMPOOL_NAMESIZE 32 /**< Maximum length of a memory pool. */
121 #define RTE_MEMPOOL_MZ_PREFIX "MP_"
124 #define RTE_MEMPOOL_MZ_FORMAT RTE_MEMPOOL_MZ_PREFIX "%s"
126 #ifdef RTE_LIBRTE_XEN_DOM0
128 /* "<name>_MP_elt" */
129 #define RTE_MEMPOOL_OBJ_NAME "%s_" RTE_MEMPOOL_MZ_PREFIX "elt"
133 #define RTE_MEMPOOL_OBJ_NAME RTE_MEMPOOL_MZ_FORMAT
135 #endif /* RTE_LIBRTE_XEN_DOM0 */
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
143 * The RTE mempool structure.
146 char name[RTE_MEMPOOL_NAMESIZE]; /**< Name of mempool. */
147 struct rte_ring *ring; /**< Ring to store objects. */
148 phys_addr_t phys_addr; /**< Phys. addr. of mempool struct. */
149 int flags; /**< Flags of the mempool. */
150 uint32_t size; /**< Size of the mempool. */
151 uint32_t cache_size; /**< Size of per-lcore local cache. */
152 uint32_t cache_flushthresh;
153 /**< Threshold before we flush excess elements. */
155 uint32_t elt_size; /**< Size of an element. */
156 uint32_t header_size; /**< Size of header (before elt). */
157 uint32_t trailer_size; /**< Size of trailer (after elt). */
159 unsigned private_data_size; /**< Size of private data. */
161 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
162 /** Per-lcore local cache. */
163 struct rte_mempool_cache local_cache[RTE_MAX_LCORE];
166 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
167 /** Per-lcore statistics. */
168 struct rte_mempool_debug_stats stats[RTE_MAX_LCORE];
171 /* Address translation support, starts from next cache line. */
173 /** Number of elements in the elt_pa array. */
174 uint32_t pg_num __rte_cache_aligned;
175 uint32_t pg_shift; /**< LOG2 of the physical pages. */
176 uintptr_t pg_mask; /**< physical page mask value. */
177 uintptr_t elt_va_start;
178 /**< Virtual address of the first mempool object. */
179 uintptr_t elt_va_end;
180 /**< Virtual address of the <size + 1> mempool object. */
181 phys_addr_t elt_pa[MEMPOOL_PG_NUM_DEFAULT];
182 /**< Array of physical pages addresses for the mempool objects buffer. */
184 } __rte_cache_aligned;
186 #define MEMPOOL_F_NO_SPREAD 0x0001 /**< Do not spread in memory. */
187 #define MEMPOOL_F_NO_CACHE_ALIGN 0x0002 /**< Do not align objs on cache lines.*/
188 #define MEMPOOL_F_SP_PUT 0x0004 /**< Default put is "single-producer".*/
189 #define MEMPOOL_F_SC_GET 0x0008 /**< Default get is "single-consumer".*/
192 * @internal When debug is enabled, store some statistics.
194 * Pointer to the memory pool.
196 * Name of the statistics field to increment in the memory pool.
198 * Number to add to the object-oriented statistics.
200 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
201 #define __MEMPOOL_STAT_ADD(mp, name, n) do { \
202 unsigned __lcore_id = rte_lcore_id(); \
203 if (__lcore_id < RTE_MAX_LCORE) { \
204 mp->stats[__lcore_id].name##_objs += n; \
205 mp->stats[__lcore_id].name##_bulk += 1; \
209 #define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
213 * Calculates size of the mempool header.
215 * Pointer to the memory pool.
217 * Number of page used to store mempool objects.
219 #define MEMPOOL_HEADER_SIZE(mp, pgn) (sizeof(*(mp)) + \
220 RTE_ALIGN_CEIL(((pgn) - RTE_DIM((mp)->elt_pa)) * \
221 sizeof ((mp)->elt_pa[0]), RTE_CACHE_LINE_SIZE))
224 * Returns TRUE if whole mempool is allocated in one contiguous block of memory.
226 #define MEMPOOL_IS_CONTIG(mp) \
227 ((mp)->pg_num == MEMPOOL_PG_NUM_DEFAULT && \
228 (mp)->phys_addr == (mp)->elt_pa[0])
231 * @internal Get a pointer to a mempool pointer in the object header.
235 * The pointer to the mempool from which the object was allocated.
237 static inline struct rte_mempool **__mempool_from_obj(void *obj)
239 struct rte_mempool **mpp;
242 off = sizeof(struct rte_mempool *);
243 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
244 off += sizeof(uint64_t);
246 mpp = (struct rte_mempool **)((char *)obj - off);
251 * Return a pointer to the mempool owning this object.
254 * An object that is owned by a pool. If this is not the case,
255 * the behavior is undefined.
257 * A pointer to the mempool structure.
259 static inline const struct rte_mempool *rte_mempool_from_obj(void *obj)
261 struct rte_mempool * const *mpp;
262 mpp = __mempool_from_obj(obj);
266 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
267 /* get header cookie value */
268 static inline uint64_t __mempool_read_header_cookie(const void *obj)
270 return *(const uint64_t *)((const char *)obj - sizeof(uint64_t));
273 /* get trailer cookie value */
274 static inline uint64_t __mempool_read_trailer_cookie(void *obj)
276 struct rte_mempool **mpp = __mempool_from_obj(obj);
277 return *(uint64_t *)((char *)obj + (*mpp)->elt_size);
280 /* write header cookie value */
281 static inline void __mempool_write_header_cookie(void *obj, int free)
284 cookie_p = (uint64_t *)((char *)obj - sizeof(uint64_t));
286 *cookie_p = RTE_MEMPOOL_HEADER_COOKIE1;
288 *cookie_p = RTE_MEMPOOL_HEADER_COOKIE2;
292 /* write trailer cookie value */
293 static inline void __mempool_write_trailer_cookie(void *obj)
296 struct rte_mempool **mpp = __mempool_from_obj(obj);
297 cookie_p = (uint64_t *)((char *)obj + (*mpp)->elt_size);
298 *cookie_p = RTE_MEMPOOL_TRAILER_COOKIE;
300 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
303 * @internal Check and update cookies or panic.
306 * Pointer to the memory pool.
307 * @param obj_table_const
308 * Pointer to a table of void * pointers (objects).
310 * Index of object in object table.
312 * - 0: object is supposed to be allocated, mark it as free
313 * - 1: object is supposed to be free, mark it as allocated
314 * - 2: just check that cookie is valid (free or allocated)
316 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
317 #ifndef __INTEL_COMPILER
318 #pragma GCC diagnostic ignored "-Wcast-qual"
320 static inline void __mempool_check_cookies(const struct rte_mempool *mp,
321 void * const *obj_table_const,
322 unsigned n, int free)
329 /* Force to drop the "const" attribute. This is done only when
330 * DEBUG is enabled */
331 tmp = (void *) obj_table_const;
332 obj_table = (void **) tmp;
337 if (rte_mempool_from_obj(obj) != mp)
338 rte_panic("MEMPOOL: object is owned by another "
341 cookie = __mempool_read_header_cookie(obj);
344 if (cookie != RTE_MEMPOOL_HEADER_COOKIE1) {
345 rte_log_set_history(0);
346 RTE_LOG(CRIT, MEMPOOL,
347 "obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
348 obj, (const void *) mp, cookie);
349 rte_panic("MEMPOOL: bad header cookie (put)\n");
351 __mempool_write_header_cookie(obj, 1);
353 else if (free == 1) {
354 if (cookie != RTE_MEMPOOL_HEADER_COOKIE2) {
355 rte_log_set_history(0);
356 RTE_LOG(CRIT, MEMPOOL,
357 "obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
358 obj, (const void *) mp, cookie);
359 rte_panic("MEMPOOL: bad header cookie (get)\n");
361 __mempool_write_header_cookie(obj, 0);
363 else if (free == 2) {
364 if (cookie != RTE_MEMPOOL_HEADER_COOKIE1 &&
365 cookie != RTE_MEMPOOL_HEADER_COOKIE2) {
366 rte_log_set_history(0);
367 RTE_LOG(CRIT, MEMPOOL,
368 "obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
369 obj, (const void *) mp, cookie);
370 rte_panic("MEMPOOL: bad header cookie (audit)\n");
373 cookie = __mempool_read_trailer_cookie(obj);
374 if (cookie != RTE_MEMPOOL_TRAILER_COOKIE) {
375 rte_log_set_history(0);
376 RTE_LOG(CRIT, MEMPOOL,
377 "obj=%p, mempool=%p, cookie=%" PRIx64 "\n",
378 obj, (const void *) mp, cookie);
379 rte_panic("MEMPOOL: bad trailer cookie\n");
383 #ifndef __INTEL_COMPILER
384 #pragma GCC diagnostic error "-Wcast-qual"
387 #define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0)
388 #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */
391 * An mempool's object iterator callback function.
393 typedef void (*rte_mempool_obj_iter_t)(void * /*obj_iter_arg*/,
394 void * /*obj_start*/,
396 uint32_t /*obj_index */);
399 * Iterates across objects of the given size and alignment in the
400 * provided chunk of memory. The given memory buffer can consist of
401 * disjoint physical pages.
402 * For each object calls the provided callback (if any).
403 * Used to populate mempool, walk through all elements of the mempool,
404 * estimate how many elements of the given size could be created in the given
407 * Virtual address of the memory buffer.
409 * Maximum number of objects to iterate through.
411 * Size of each object.
413 * Array of phyiscall addresses of the pages that comprises given memory
416 * Number of elements in the paddr array.
418 * LOG2 of the physical pages size.
420 * Object iterator callback function (could be NULL).
421 * @param obj_iter_arg
422 * User defined Prameter for the object iterator callback function.
425 * Number of objects iterated through.
428 uint32_t rte_mempool_obj_iter(void *vaddr,
429 uint32_t elt_num, size_t elt_sz, size_t align,
430 const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift,
431 rte_mempool_obj_iter_t obj_iter, void *obj_iter_arg);
434 * An object constructor callback function for mempool.
436 * Arguments are the mempool, the opaque pointer given by the user in
437 * rte_mempool_create(), the pointer to the element and the index of
438 * the element in the pool.
440 typedef void (rte_mempool_obj_ctor_t)(struct rte_mempool *, void *,
444 * A mempool constructor callback function.
446 * Arguments are the mempool and the opaque pointer given by the user in
447 * rte_mempool_create().
449 typedef void (rte_mempool_ctor_t)(struct rte_mempool *, void *);
452 * Creates a new mempool named *name* in memory.
454 * This function uses ``memzone_reserve()`` to allocate memory. The
455 * pool contains n elements of elt_size. Its size is set to n.
456 * All elements of the mempool are allocated together with the mempool header,
457 * in one physically continuous chunk of memory.
460 * The name of the mempool.
462 * The number of elements in the mempool. The optimum size (in terms of
463 * memory usage) for a mempool is when n is a power of two minus one:
466 * The size of each element.
468 * If cache_size is non-zero, the rte_mempool library will try to
469 * limit the accesses to the common lockless pool, by maintaining a
470 * per-lcore object cache. This argument must be lower or equal to
471 * CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE and n / 1.5. It is advised to choose
472 * cache_size to have "n modulo cache_size == 0": if this is
473 * not the case, some elements will always stay in the pool and will
474 * never be used. The access to the per-lcore table is of course
475 * faster than the multi-producer/consumer pool. The cache can be
476 * disabled if the cache_size argument is set to 0; it can be useful to
477 * avoid losing objects in cache. Note that even if not used, the
478 * memory space for cache is always reserved in a mempool structure,
479 * except if CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE is set to 0.
480 * @param private_data_size
481 * The size of the private data appended after the mempool
482 * structure. This is useful for storing some private data after the
483 * mempool structure, as is done for rte_mbuf_pool for example.
485 * A function pointer that is called for initialization of the pool,
486 * before object initialization. The user can initialize the private
487 * data in this function if needed. This parameter can be NULL if
490 * An opaque pointer to data that can be used in the mempool
491 * constructor function.
493 * A function pointer that is called for each object at
494 * initialization of the pool. The user can set some meta data in
495 * objects if needed. This parameter can be NULL if not needed.
496 * The obj_init() function takes the mempool pointer, the init_arg,
497 * the object pointer and the object number as parameters.
498 * @param obj_init_arg
499 * An opaque pointer to data that can be used as an argument for
500 * each call to the object constructor function.
502 * The *socket_id* argument is the socket identifier in the case of
503 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
504 * constraint for the reserved zone.
506 * The *flags* arguments is an OR of following flags:
507 * - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
508 * between channels in RAM: the pool allocator will add padding
509 * between objects depending on the hardware configuration. See
510 * Memory alignment constraints for details. If this flag is set,
511 * the allocator will just align them to a cache line.
512 * - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
513 * cache-aligned. This flag removes this constraint, and no
514 * padding will be present between objects. This flag implies
515 * MEMPOOL_F_NO_SPREAD.
516 * - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
517 * when using rte_mempool_put() or rte_mempool_put_bulk() is
518 * "single-producer". Otherwise, it is "multi-producers".
519 * - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
520 * when using rte_mempool_get() or rte_mempool_get_bulk() is
521 * "single-consumer". Otherwise, it is "multi-consumers".
523 * The pointer to the new allocated mempool, on success. NULL on error
524 * with rte_errno set appropriately. Possible rte_errno values include:
525 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
526 * - E_RTE_SECONDARY - function was called from a secondary process instance
527 * - EINVAL - cache size provided is too large
528 * - ENOSPC - the maximum number of memzones has already been allocated
529 * - EEXIST - a memzone with the same name already exists
530 * - ENOMEM - no appropriate memory area found in which to create memzone
533 rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
534 unsigned cache_size, unsigned private_data_size,
535 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
536 rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
537 int socket_id, unsigned flags);
540 * Creates a new mempool named *name* in memory.
542 * This function uses ``memzone_reserve()`` to allocate memory. The
543 * pool contains n elements of elt_size. Its size is set to n.
544 * Depending on the input parameters, mempool elements can be either allocated
545 * together with the mempool header, or an externally provided memory buffer
546 * could be used to store mempool objects. In later case, that external
547 * memory buffer can consist of set of disjoint phyiscal pages.
550 * The name of the mempool.
552 * The number of elements in the mempool. The optimum size (in terms of
553 * memory usage) for a mempool is when n is a power of two minus one:
556 * The size of each element.
558 * If cache_size is non-zero, the rte_mempool library will try to
559 * limit the accesses to the common lockless pool, by maintaining a
560 * per-lcore object cache. This argument must be lower or equal to
561 * CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE. It is advised to choose
562 * cache_size to have "n modulo cache_size == 0": if this is
563 * not the case, some elements will always stay in the pool and will
564 * never be used. The access to the per-lcore table is of course
565 * faster than the multi-producer/consumer pool. The cache can be
566 * disabled if the cache_size argument is set to 0; it can be useful to
567 * avoid losing objects in cache. Note that even if not used, the
568 * memory space for cache is always reserved in a mempool structure,
569 * except if CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE is set to 0.
570 * @param private_data_size
571 * The size of the private data appended after the mempool
572 * structure. This is useful for storing some private data after the
573 * mempool structure, as is done for rte_mbuf_pool for example.
575 * A function pointer that is called for initialization of the pool,
576 * before object initialization. The user can initialize the private
577 * data in this function if needed. This parameter can be NULL if
580 * An opaque pointer to data that can be used in the mempool
581 * constructor function.
583 * A function pointer that is called for each object at
584 * initialization of the pool. The user can set some meta data in
585 * objects if needed. This parameter can be NULL if not needed.
586 * The obj_init() function takes the mempool pointer, the init_arg,
587 * the object pointer and the object number as parameters.
588 * @param obj_init_arg
589 * An opaque pointer to data that can be used as an argument for
590 * each call to the object constructor function.
592 * The *socket_id* argument is the socket identifier in the case of
593 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
594 * constraint for the reserved zone.
596 * The *flags* arguments is an OR of following flags:
597 * - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
598 * between channels in RAM: the pool allocator will add padding
599 * between objects depending on the hardware configuration. See
600 * Memory alignment constraints for details. If this flag is set,
601 * the allocator will just align them to a cache line.
602 * - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
603 * cache-aligned. This flag removes this constraint, and no
604 * padding will be present between objects. This flag implies
605 * MEMPOOL_F_NO_SPREAD.
606 * - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
607 * when using rte_mempool_put() or rte_mempool_put_bulk() is
608 * "single-producer". Otherwise, it is "multi-producers".
609 * - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
610 * when using rte_mempool_get() or rte_mempool_get_bulk() is
611 * "single-consumer". Otherwise, it is "multi-consumers".
613 * Virtual address of the externally allocated memory buffer.
614 * Will be used to store mempool objects.
616 * Array of phyiscall addresses of the pages that comprises given memory
619 * Number of elements in the paddr array.
621 * LOG2 of the physical pages size.
623 * The pointer to the new allocated mempool, on success. NULL on error
624 * with rte_errno set appropriately. Possible rte_errno values include:
625 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
626 * - E_RTE_SECONDARY - function was called from a secondary process instance
627 * - EINVAL - cache size provided is too large
628 * - ENOSPC - the maximum number of memzones has already been allocated
629 * - EEXIST - a memzone with the same name already exists
630 * - ENOMEM - no appropriate memory area found in which to create memzone
633 rte_mempool_xmem_create(const char *name, unsigned n, unsigned elt_size,
634 unsigned cache_size, unsigned private_data_size,
635 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
636 rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
637 int socket_id, unsigned flags, void *vaddr,
638 const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift);
640 #ifdef RTE_LIBRTE_XEN_DOM0
642 * Creates a new mempool named *name* in memory on Xen Dom0.
644 * This function uses ``rte_mempool_xmem_create()`` to allocate memory. The
645 * pool contains n elements of elt_size. Its size is set to n.
646 * All elements of the mempool are allocated together with the mempool header,
647 * and memory buffer can consist of set of disjoint phyiscal pages.
650 * The name of the mempool.
652 * The number of elements in the mempool. The optimum size (in terms of
653 * memory usage) for a mempool is when n is a power of two minus one:
656 * The size of each element.
658 * If cache_size is non-zero, the rte_mempool library will try to
659 * limit the accesses to the common lockless pool, by maintaining a
660 * per-lcore object cache. This argument must be lower or equal to
661 * CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE. It is advised to choose
662 * cache_size to have "n modulo cache_size == 0": if this is
663 * not the case, some elements will always stay in the pool and will
664 * never be used. The access to the per-lcore table is of course
665 * faster than the multi-producer/consumer pool. The cache can be
666 * disabled if the cache_size argument is set to 0; it can be useful to
667 * avoid losing objects in cache. Note that even if not used, the
668 * memory space for cache is always reserved in a mempool structure,
669 * except if CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE is set to 0.
670 * @param private_data_size
671 * The size of the private data appended after the mempool
672 * structure. This is useful for storing some private data after the
673 * mempool structure, as is done for rte_mbuf_pool for example.
675 * A function pointer that is called for initialization of the pool,
676 * before object initialization. The user can initialize the private
677 * data in this function if needed. This parameter can be NULL if
680 * An opaque pointer to data that can be used in the mempool
681 * constructor function.
683 * A function pointer that is called for each object at
684 * initialization of the pool. The user can set some meta data in
685 * objects if needed. This parameter can be NULL if not needed.
686 * The obj_init() function takes the mempool pointer, the init_arg,
687 * the object pointer and the object number as parameters.
688 * @param obj_init_arg
689 * An opaque pointer to data that can be used as an argument for
690 * each call to the object constructor function.
692 * The *socket_id* argument is the socket identifier in the case of
693 * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
694 * constraint for the reserved zone.
696 * The *flags* arguments is an OR of following flags:
697 * - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
698 * between channels in RAM: the pool allocator will add padding
699 * between objects depending on the hardware configuration. See
700 * Memory alignment constraints for details. If this flag is set,
701 * the allocator will just align them to a cache line.
702 * - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
703 * cache-aligned. This flag removes this constraint, and no
704 * padding will be present between objects. This flag implies
705 * MEMPOOL_F_NO_SPREAD.
706 * - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
707 * when using rte_mempool_put() or rte_mempool_put_bulk() is
708 * "single-producer". Otherwise, it is "multi-producers".
709 * - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
710 * when using rte_mempool_get() or rte_mempool_get_bulk() is
711 * "single-consumer". Otherwise, it is "multi-consumers".
713 * The pointer to the new allocated mempool, on success. NULL on error
714 * with rte_errno set appropriately. Possible rte_errno values include:
715 * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
716 * - E_RTE_SECONDARY - function was called from a secondary process instance
717 * - EINVAL - cache size provided is too large
718 * - ENOSPC - the maximum number of memzones has already been allocated
719 * - EEXIST - a memzone with the same name already exists
720 * - ENOMEM - no appropriate memory area found in which to create memzone
723 rte_dom0_mempool_create(const char *name, unsigned n, unsigned elt_size,
724 unsigned cache_size, unsigned private_data_size,
725 rte_mempool_ctor_t *mp_init, void *mp_init_arg,
726 rte_mempool_obj_ctor_t *obj_init, void *obj_init_arg,
727 int socket_id, unsigned flags);
731 * Dump the status of the mempool to the console.
734 * A pointer to a file for output
736 * A pointer to the mempool structure.
738 void rte_mempool_dump(FILE *f, const struct rte_mempool *mp);
741 * @internal Put several objects back in the mempool; used internally.
743 * A pointer to the mempool structure.
745 * A pointer to a table of void * pointers (objects).
747 * The number of objects to store back in the mempool, must be strictly
750 * Mono-producer (0) or multi-producers (1).
752 static inline void __attribute__((always_inline))
753 __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
754 unsigned n, int is_mp)
756 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
757 struct rte_mempool_cache *cache;
760 unsigned lcore_id = rte_lcore_id();
761 uint32_t cache_size = mp->cache_size;
762 uint32_t flushthresh = mp->cache_flushthresh;
763 #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
765 /* increment stat now, adding in mempool always success */
766 __MEMPOOL_STAT_ADD(mp, put, n);
768 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
769 /* cache is not enabled or single producer or non-EAL thread */
770 if (unlikely(cache_size == 0 || is_mp == 0 ||
771 lcore_id >= RTE_MAX_LCORE))
774 /* Go straight to ring if put would overflow mem allocated for cache */
775 if (unlikely(n > RTE_MEMPOOL_CACHE_MAX_SIZE))
778 cache = &mp->local_cache[lcore_id];
779 cache_objs = &cache->objs[cache->len];
782 * The cache follows the following algorithm
783 * 1. Add the objects to the cache
784 * 2. Anything greater than the cache min value (if it crosses the
785 * cache flush threshold) is flushed to the ring.
788 /* Add elements back into the cache */
789 for (index = 0; index < n; ++index, obj_table++)
790 cache_objs[index] = *obj_table;
794 if (cache->len >= flushthresh) {
795 rte_ring_mp_enqueue_bulk(mp->ring, &cache->objs[cache_size],
796 cache->len - cache_size);
797 cache->len = cache_size;
803 #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
805 /* push remaining objects in ring */
806 #ifdef RTE_LIBRTE_MEMPOOL_DEBUG
808 if (rte_ring_mp_enqueue_bulk(mp->ring, obj_table, n) < 0)
809 rte_panic("cannot put objects in mempool\n");
812 if (rte_ring_sp_enqueue_bulk(mp->ring, obj_table, n) < 0)
813 rte_panic("cannot put objects in mempool\n");
817 rte_ring_mp_enqueue_bulk(mp->ring, obj_table, n);
819 rte_ring_sp_enqueue_bulk(mp->ring, obj_table, n);
825 * Put several objects back in the mempool (multi-producers safe).
828 * A pointer to the mempool structure.
830 * A pointer to a table of void * pointers (objects).
832 * The number of objects to add in the mempool from the obj_table.
834 static inline void __attribute__((always_inline))
835 rte_mempool_mp_put_bulk(struct rte_mempool *mp, void * const *obj_table,
838 __mempool_check_cookies(mp, obj_table, n, 0);
839 __mempool_put_bulk(mp, obj_table, n, 1);
843 * Put several objects back in the mempool (NOT multi-producers safe).
846 * A pointer to the mempool structure.
848 * A pointer to a table of void * pointers (objects).
850 * The number of objects to add in the mempool from obj_table.
853 rte_mempool_sp_put_bulk(struct rte_mempool *mp, void * const *obj_table,
856 __mempool_check_cookies(mp, obj_table, n, 0);
857 __mempool_put_bulk(mp, obj_table, n, 0);
861 * Put several objects back in the mempool.
863 * This function calls the multi-producer or the single-producer
864 * version depending on the default behavior that was specified at
865 * mempool creation time (see flags).
868 * A pointer to the mempool structure.
870 * A pointer to a table of void * pointers (objects).
872 * The number of objects to add in the mempool from obj_table.
874 static inline void __attribute__((always_inline))
875 rte_mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
878 __mempool_check_cookies(mp, obj_table, n, 0);
879 __mempool_put_bulk(mp, obj_table, n, !(mp->flags & MEMPOOL_F_SP_PUT));
883 * Put one object in the mempool (multi-producers safe).
886 * A pointer to the mempool structure.
888 * A pointer to the object to be added.
890 static inline void __attribute__((always_inline))
891 rte_mempool_mp_put(struct rte_mempool *mp, void *obj)
893 rte_mempool_mp_put_bulk(mp, &obj, 1);
897 * Put one object back in the mempool (NOT multi-producers safe).
900 * A pointer to the mempool structure.
902 * A pointer to the object to be added.
904 static inline void __attribute__((always_inline))
905 rte_mempool_sp_put(struct rte_mempool *mp, void *obj)
907 rte_mempool_sp_put_bulk(mp, &obj, 1);
911 * Put one object back in the mempool.
913 * This function calls the multi-producer or the single-producer
914 * version depending on the default behavior that was specified at
915 * mempool creation time (see flags).
918 * A pointer to the mempool structure.
920 * A pointer to the object to be added.
922 static inline void __attribute__((always_inline))
923 rte_mempool_put(struct rte_mempool *mp, void *obj)
925 rte_mempool_put_bulk(mp, &obj, 1);
929 * @internal Get several objects from the mempool; used internally.
931 * A pointer to the mempool structure.
933 * A pointer to a table of void * pointers (objects).
935 * The number of objects to get, must be strictly positive.
937 * Mono-consumer (0) or multi-consumers (1).
939 * - >=0: Success; number of objects supplied.
940 * - <0: Error; code of ring dequeue function.
942 static inline int __attribute__((always_inline))
943 __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
944 unsigned n, int is_mc)
947 #if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
948 struct rte_mempool_cache *cache;
951 unsigned lcore_id = rte_lcore_id();
952 uint32_t cache_size = mp->cache_size;
954 /* cache is not enabled or single consumer */
955 if (unlikely(cache_size == 0 || is_mc == 0 ||
956 n >= cache_size || lcore_id >= RTE_MAX_LCORE))
959 cache = &mp->local_cache[lcore_id];
960 cache_objs = cache->objs;
962 /* Can this be satisfied from the cache? */
963 if (cache->len < n) {
964 /* No. Backfill the cache first, and then fill from it */
965 uint32_t req = n + (cache_size - cache->len);
967 /* How many do we require i.e. number to fill the cache + the request */
968 ret = rte_ring_mc_dequeue_bulk(mp->ring, &cache->objs[cache->len], req);
969 if (unlikely(ret < 0)) {
971 * In the offchance that we are buffer constrained,
972 * where we are not able to allocate cache + n, go to
973 * the ring directly. If that fails, we are truly out of
982 /* Now fill in the response ... */
983 for (index = 0, len = cache->len - 1; index < n; ++index, len--, obj_table++)
984 *obj_table = cache_objs[len];
988 __MEMPOOL_STAT_ADD(mp, get_success, n);
993 #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
995 /* get remaining objects from ring */
997 ret = rte_ring_mc_dequeue_bulk(mp->ring, obj_table, n);
999 ret = rte_ring_sc_dequeue_bulk(mp->ring, obj_table, n);
1002 __MEMPOOL_STAT_ADD(mp, get_fail, n);
1004 __MEMPOOL_STAT_ADD(mp, get_success, n);
1010 * Get several objects from the mempool (multi-consumers safe).
1012 * If cache is enabled, objects will be retrieved first from cache,
1013 * subsequently from the common pool. Note that it can return -ENOENT when
1014 * the local cache and common pool are empty, even if cache from other
1018 * A pointer to the mempool structure.
1020 * A pointer to a table of void * pointers (objects) that will be filled.
1022 * The number of objects to get from mempool to obj_table.
1024 * - 0: Success; objects taken.
1025 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1027 static inline int __attribute__((always_inline))
1028 rte_mempool_mc_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned n)
1031 ret = __mempool_get_bulk(mp, obj_table, n, 1);
1033 __mempool_check_cookies(mp, obj_table, n, 1);
1038 * Get several objects from the mempool (NOT multi-consumers safe).
1040 * If cache is enabled, objects will be retrieved first from cache,
1041 * subsequently from the common pool. Note that it can return -ENOENT when
1042 * the local cache and common pool are empty, even if cache from other
1046 * A pointer to the mempool structure.
1048 * A pointer to a table of void * pointers (objects) that will be filled.
1050 * The number of objects to get from the mempool to obj_table.
1052 * - 0: Success; objects taken.
1053 * - -ENOENT: Not enough entries in the mempool; no object is
1056 static inline int __attribute__((always_inline))
1057 rte_mempool_sc_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned n)
1060 ret = __mempool_get_bulk(mp, obj_table, n, 0);
1062 __mempool_check_cookies(mp, obj_table, n, 1);
1067 * Get several objects from the mempool.
1069 * This function calls the multi-consumers or the single-consumer
1070 * version, depending on the default behaviour that was specified at
1071 * mempool creation time (see flags).
1073 * If cache is enabled, objects will be retrieved first from cache,
1074 * subsequently from the common pool. Note that it can return -ENOENT when
1075 * the local cache and common pool are empty, even if cache from other
1079 * A pointer to the mempool structure.
1081 * A pointer to a table of void * pointers (objects) that will be filled.
1083 * The number of objects to get from the mempool to obj_table.
1085 * - 0: Success; objects taken
1086 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1088 static inline int __attribute__((always_inline))
1089 rte_mempool_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned n)
1092 ret = __mempool_get_bulk(mp, obj_table, n,
1093 !(mp->flags & MEMPOOL_F_SC_GET));
1095 __mempool_check_cookies(mp, obj_table, n, 1);
1100 * Get one object from the mempool (multi-consumers safe).
1102 * If cache is enabled, objects will be retrieved first from cache,
1103 * subsequently from the common pool. Note that it can return -ENOENT when
1104 * the local cache and common pool are empty, even if cache from other
1108 * A pointer to the mempool structure.
1110 * A pointer to a void * pointer (object) that will be filled.
1112 * - 0: Success; objects taken.
1113 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1115 static inline int __attribute__((always_inline))
1116 rte_mempool_mc_get(struct rte_mempool *mp, void **obj_p)
1118 return rte_mempool_mc_get_bulk(mp, obj_p, 1);
1122 * Get one object from the mempool (NOT multi-consumers safe).
1124 * If cache is enabled, objects will be retrieved first from cache,
1125 * subsequently from the common pool. Note that it can return -ENOENT when
1126 * the local cache and common pool are empty, even if cache from other
1130 * A pointer to the mempool structure.
1132 * A pointer to a void * pointer (object) that will be filled.
1134 * - 0: Success; objects taken.
1135 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1137 static inline int __attribute__((always_inline))
1138 rte_mempool_sc_get(struct rte_mempool *mp, void **obj_p)
1140 return rte_mempool_sc_get_bulk(mp, obj_p, 1);
1144 * Get one object from the mempool.
1146 * This function calls the multi-consumers or the single-consumer
1147 * version, depending on the default behavior that was specified at
1148 * mempool creation (see flags).
1150 * If cache is enabled, objects will be retrieved first from cache,
1151 * subsequently from the common pool. Note that it can return -ENOENT when
1152 * the local cache and common pool are empty, even if cache from other
1156 * A pointer to the mempool structure.
1158 * A pointer to a void * pointer (object) that will be filled.
1160 * - 0: Success; objects taken.
1161 * - -ENOENT: Not enough entries in the mempool; no object is retrieved.
1163 static inline int __attribute__((always_inline))
1164 rte_mempool_get(struct rte_mempool *mp, void **obj_p)
1166 return rte_mempool_get_bulk(mp, obj_p, 1);
1170 * Return the number of entries in the mempool.
1172 * When cache is enabled, this function has to browse the length of
1173 * all lcores, so it should not be used in a data path, but only for
1177 * A pointer to the mempool structure.
1179 * The number of entries in the mempool.
1181 unsigned rte_mempool_count(const struct rte_mempool *mp);
1184 * Return the number of free entries in the mempool ring.
1185 * i.e. how many entries can be freed back to the mempool.
1187 * NOTE: This corresponds to the number of elements *allocated* from the
1188 * memory pool, not the number of elements in the pool itself. To count
1189 * the number elements currently available in the pool, use "rte_mempool_count"
1191 * When cache is enabled, this function has to browse the length of
1192 * all lcores, so it should not be used in a data path, but only for
1196 * A pointer to the mempool structure.
1198 * The number of free entries in the mempool.
1200 static inline unsigned
1201 rte_mempool_free_count(const struct rte_mempool *mp)
1203 return mp->size - rte_mempool_count(mp);
1207 * Test if the mempool is full.
1209 * When cache is enabled, this function has to browse the length of all
1210 * lcores, so it should not be used in a data path, but only for debug
1214 * A pointer to the mempool structure.
1216 * - 1: The mempool is full.
1217 * - 0: The mempool is not full.
1220 rte_mempool_full(const struct rte_mempool *mp)
1222 return !!(rte_mempool_count(mp) == mp->size);
1226 * Test if the mempool is empty.
1228 * When cache is enabled, this function has to browse the length of all
1229 * lcores, so it should not be used in a data path, but only for debug
1233 * A pointer to the mempool structure.
1235 * - 1: The mempool is empty.
1236 * - 0: The mempool is not empty.
1239 rte_mempool_empty(const struct rte_mempool *mp)
1241 return !!(rte_mempool_count(mp) == 0);
1245 * Return the physical address of elt, which is an element of the pool mp.
1248 * A pointer to the mempool structure.
1250 * A pointer (virtual address) to the element of the pool.
1252 * The physical address of the elt element.
1254 static inline phys_addr_t
1255 rte_mempool_virt2phy(const struct rte_mempool *mp, const void *elt)
1257 if (rte_eal_has_hugepages()) {
1260 off = (const char *)elt - (const char *)mp->elt_va_start;
1261 return (mp->elt_pa[off >> mp->pg_shift] + (off & mp->pg_mask));
1264 * If huge pages are disabled, we cannot assume the
1265 * memory region to be physically contiguous.
1266 * Lookup for each element.
1268 return rte_mem_virt2phy(elt);
1273 * Check the consistency of mempool objects.
1275 * Verify the coherency of fields in the mempool structure. Also check
1276 * that the cookies of mempool objects (even the ones that are not
1277 * present in pool) have a correct value. If not, a panic will occur.
1280 * A pointer to the mempool structure.
1282 void rte_mempool_audit(const struct rte_mempool *mp);
1285 * Return a pointer to the private data in an mempool structure.
1288 * A pointer to the mempool structure.
1290 * A pointer to the private data.
1292 static inline void *rte_mempool_get_priv(struct rte_mempool *mp)
1294 return (char *)mp + MEMPOOL_HEADER_SIZE(mp, mp->pg_num);
1298 * Dump the status of all mempools on the console
1301 * A pointer to a file for output
1303 void rte_mempool_list_dump(FILE *f);
1306 * Search a mempool from its name
1309 * The name of the mempool.
1311 * The pointer to the mempool matching the name, or NULL if not found.
1313 * with rte_errno set appropriately. Possible rte_errno values include:
1314 * - ENOENT - required entry not available to return.
1317 struct rte_mempool *rte_mempool_lookup(const char *name);
1320 * Given a desired size of the mempool element and mempool flags,
1321 * caluclates header, trailer, body and total sizes of the mempool object.
1323 * The size of each element.
1325 * The flags used for the mempool creation.
1326 * Consult rte_mempool_create() for more information about possible values.
1327 * The size of each element.
1329 * Total size of the mempool object.
1331 uint32_t rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
1332 struct rte_mempool_objsz *sz);
1335 * Calculate maximum amount of memory required to store given number of objects.
1336 * Assumes that the memory buffer will be aligned at page boundary.
1337 * Note, that if object size is bigger then page size, then it assumes that
1338 * we have a subsets of physically continuous pages big enough to store
1339 * at least one object.
1341 * Number of elements.
1343 * The size of each element.
1345 * LOG2 of the physical pages size.
1347 * Required memory size aligned at page boundary.
1349 size_t rte_mempool_xmem_size(uint32_t elt_num, size_t elt_sz,
1353 * Calculate how much memory would be actually required with the given
1354 * memory footprint to store required number of objects.
1356 * Virtual address of the externally allocated memory buffer.
1357 * Will be used to store mempool objects.
1359 * Number of elements.
1361 * The size of each element.
1363 * Array of phyiscall addresses of the pages that comprises given memory
1366 * Number of elements in the paddr array.
1368 * LOG2 of the physical pages size.
1370 * Number of bytes needed to store given number of objects,
1371 * aligned to the given page size.
1372 * If provided memory buffer is not big enough:
1373 * (-1) * actual number of elemnts that can be stored in that buffer.
1375 ssize_t rte_mempool_xmem_usage(void *vaddr, uint32_t elt_num, size_t elt_sz,
1376 const phys_addr_t paddr[], uint32_t pg_num, uint32_t pg_shift);
1379 * Walk list of all memory pools
1384 * Argument passed to iterator
1386 void rte_mempool_walk(void (*func)(const struct rte_mempool *, void *arg),
1393 #endif /* _RTE_MEMPOOL_H_ */