DPDK logo

Elixir Cross Referencer

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation.
 * Copyright(c) 2016 6WIND S.A.
 */

#ifndef _RTE_MEMPOOL_H_
#define _RTE_MEMPOOL_H_

/**
 * @file
 * RTE Mempool.
 *
 * A memory pool is an allocator of fixed-size object. It is
 * identified by its name, and uses a ring to store free objects. It
 * provides some other optional services, like a per-core object
 * cache, and an alignment helper to ensure that objects are padded
 * to spread them equally on all RAM channels, ranks, and so on.
 *
 * Objects owned by a mempool should never be added in another
 * mempool. When an object is freed using rte_mempool_put() or
 * equivalent, the object data is not modified; the user can save some
 * meta-data in the object data and retrieve them when allocating a
 * new object.
 *
 * Note: the mempool implementation is not preemptible. An lcore must not be
 * interrupted by another task that uses the same mempool (because it uses a
 * ring which is not preemptible). Also, usual mempool functions like
 * rte_mempool_get() or rte_mempool_put() are designed to be called from an EAL
 * thread due to the internal per-lcore cache. Due to the lack of caching,
 * rte_mempool_get() or rte_mempool_put() performance will suffer when called
 * by non-EAL threads. Instead, non-EAL threads should call
 * rte_mempool_generic_get() or rte_mempool_generic_put() with a user cache
 * created with rte_mempool_cache_create().
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <inttypes.h>
#include <sys/queue.h>

#include <rte_config.h>
#include <rte_spinlock.h>
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_lcore.h>
#include <rte_memory.h>
#include <rte_branch_prediction.h>
#include <rte_ring.h>
#include <rte_memcpy.h>
#include <rte_common.h>

#ifdef __cplusplus
extern "C" {
#endif

#define RTE_MEMPOOL_HEADER_COOKIE1  0xbadbadbadadd2e55ULL /**< Header cookie. */
#define RTE_MEMPOOL_HEADER_COOKIE2  0xf2eef2eedadd2e55ULL /**< Header cookie. */
#define RTE_MEMPOOL_TRAILER_COOKIE  0xadd2e55badbadbadULL /**< Trailer cookie.*/

#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
/**
 * A structure that stores the mempool statistics (per-lcore).
 */
struct rte_mempool_debug_stats {
	uint64_t put_bulk;         /**< Number of puts. */
	uint64_t put_objs;         /**< Number of objects successfully put. */
	uint64_t get_success_bulk; /**< Successful allocation number. */
	uint64_t get_success_objs; /**< Objects successfully allocated. */
	uint64_t get_fail_bulk;    /**< Failed allocation number. */
	uint64_t get_fail_objs;    /**< Objects that failed to be allocated. */
	/** Successful allocation number of contiguous blocks. */
	uint64_t get_success_blks;
	/** Failed allocation number of contiguous blocks. */
	uint64_t get_fail_blks;
} __rte_cache_aligned;
#endif

/**
 * A structure that stores a per-core object cache.
 */
struct rte_mempool_cache {
	uint32_t size;	      /**< Size of the cache */
	uint32_t flushthresh; /**< Threshold before we flush excess elements */
	uint32_t len;	      /**< Current cache count */
	/*
	 * Cache is allocated to this size to allow it to overflow in certain
	 * cases to avoid needless emptying of cache.
	 */
	void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
} __rte_cache_aligned;

/**
 * A structure that stores the size of mempool elements.
 */
struct rte_mempool_objsz {
	uint32_t elt_size;     /**< Size of an element. */
	uint32_t header_size;  /**< Size of header (before elt). */
	uint32_t trailer_size; /**< Size of trailer (after elt). */
	uint32_t total_size;
	/**< Total size of an object (header + elt + trailer). */
};

/**< Maximum length of a memory pool's name. */
#define RTE_MEMPOOL_NAMESIZE (RTE_RING_NAMESIZE - \
			      sizeof(RTE_MEMPOOL_MZ_PREFIX) + 1)
#define RTE_MEMPOOL_MZ_PREFIX "MP_"

/* "MP_<name>" */
#define	RTE_MEMPOOL_MZ_FORMAT	RTE_MEMPOOL_MZ_PREFIX "%s"

#define	MEMPOOL_PG_SHIFT_MAX	(sizeof(uintptr_t) * CHAR_BIT - 1)

/** Mempool over one chunk of physically continuous memory */
#define	MEMPOOL_PG_NUM_DEFAULT	1

#ifndef RTE_MEMPOOL_ALIGN
#define RTE_MEMPOOL_ALIGN	RTE_CACHE_LINE_SIZE
#endif

#define RTE_MEMPOOL_ALIGN_MASK	(RTE_MEMPOOL_ALIGN - 1)

/**
 * Mempool object header structure
 *
 * Each object stored in mempools are prefixed by this header structure,
 * it allows to retrieve the mempool pointer from the object and to
 * iterate on all objects attached to a mempool. When debug is enabled,
 * a cookie is also added in this structure preventing corruptions and
 * double-frees.
 */
struct rte_mempool_objhdr {
	STAILQ_ENTRY(rte_mempool_objhdr) next; /**< Next in list. */
	struct rte_mempool *mp;          /**< The mempool owning the object. */
	RTE_STD_C11
	union {
		rte_iova_t iova;         /**< IO address of the object. */
		phys_addr_t physaddr;    /**< deprecated - Physical address of the object. */
	};
#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
	uint64_t cookie;                 /**< Debug cookie. */
#endif
};

/**
 * A list of object headers type
 */
STAILQ_HEAD(rte_mempool_objhdr_list, rte_mempool_objhdr);

#ifdef RTE_LIBRTE_MEMPOOL_DEBUG

/**
 * Mempool object trailer structure
 *
 * In debug mode, each object stored in mempools are suffixed by this
 * trailer structure containing a cookie preventing memory corruptions.
 */
struct rte_mempool_objtlr {
	uint64_t cookie;                 /**< Debug cookie. */
};

#endif

/**
 * A list of memory where objects are stored
 */
STAILQ_HEAD(rte_mempool_memhdr_list, rte_mempool_memhdr);

/**
 * Callback used to free a memory chunk
 */
typedef void (rte_mempool_memchunk_free_cb_t)(struct rte_mempool_memhdr *memhdr,
	void *opaque);

/**
 * Mempool objects memory header structure
 *
 * The memory chunks where objects are stored. Each chunk is virtually
 * and physically contiguous.
 */
struct rte_mempool_memhdr {
	STAILQ_ENTRY(rte_mempool_memhdr) next; /**< Next in list. */
	struct rte_mempool *mp;  /**< The mempool owning the chunk */
	void *addr;              /**< Virtual address of the chunk */
	RTE_STD_C11
	union {
		rte_iova_t iova;       /**< IO address of the chunk */
		phys_addr_t phys_addr; /**< Physical address of the chunk */
	};
	size_t len;              /**< length of the chunk */
	rte_mempool_memchunk_free_cb_t *free_cb; /**< Free callback */
	void *opaque;            /**< Argument passed to the free callback */
};

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * Additional information about the mempool
 *
 * The structure is cache-line aligned to avoid ABI breakages in
 * a number of cases when something small is added.
 */
struct rte_mempool_info {
	/** Number of objects in the contiguous block */
	unsigned int contig_block_size;
} __rte_cache_aligned;

/**
 * The RTE mempool structure.
 */
struct rte_mempool {
	/*
	 * Note: this field kept the RTE_MEMZONE_NAMESIZE size due to ABI
	 * compatibility requirements, it could be changed to
	 * RTE_MEMPOOL_NAMESIZE next time the ABI changes
	 */
	char name[RTE_MEMZONE_NAMESIZE]; /**< Name of mempool. */
	RTE_STD_C11
	union {
		void *pool_data;         /**< Ring or pool to store objects. */
		uint64_t pool_id;        /**< External mempool identifier. */
	};
	void *pool_config;               /**< optional args for ops alloc. */
	const struct rte_memzone *mz;    /**< Memzone where pool is alloc'd. */
	unsigned int flags;              /**< Flags of the mempool. */
	int socket_id;                   /**< Socket id passed at create. */
	uint32_t size;                   /**< Max size of the mempool. */
	uint32_t cache_size;
	/**< Size of per-lcore default local cache. */

	uint32_t elt_size;               /**< Size of an element. */
	uint32_t header_size;            /**< Size of header (before elt). */
	uint32_t trailer_size;           /**< Size of trailer (after elt). */

	unsigned private_data_size;      /**< Size of private data. */
	/**
	 * Index into rte_mempool_ops_table array of mempool ops
	 * structs, which contain callback function pointers.
	 * We're using an index here rather than pointers to the callbacks
	 * to facilitate any secondary processes that may want to use
	 * this mempool.
	 */
	int32_t ops_index;

	struct rte_mempool_cache *local_cache; /**< Per-lcore local cache */

	uint32_t populated_size;         /**< Number of populated objects. */
	struct rte_mempool_objhdr_list elt_list; /**< List of objects in pool */
	uint32_t nb_mem_chunks;          /**< Number of memory chunks */
	struct rte_mempool_memhdr_list mem_list; /**< List of memory chunks */

#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
	/** Per-lcore statistics. */
	struct rte_mempool_debug_stats stats[RTE_MAX_LCORE];
#endif
}  __rte_cache_aligned;

#define MEMPOOL_F_NO_SPREAD      0x0001 /**< Do not spread among memory channels. */
#define MEMPOOL_F_NO_CACHE_ALIGN 0x0002 /**< Do not align objs on cache lines.*/
#define MEMPOOL_F_SP_PUT         0x0004 /**< Default put is "single-producer".*/
#define MEMPOOL_F_SC_GET         0x0008 /**< Default get is "single-consumer".*/
#define MEMPOOL_F_POOL_CREATED   0x0010 /**< Internal: pool is created. */
#define MEMPOOL_F_NO_IOVA_CONTIG 0x0020 /**< Don't need IOVA contiguous objs. */
#define MEMPOOL_F_NO_PHYS_CONTIG MEMPOOL_F_NO_IOVA_CONTIG /* deprecated */

/**
 * @internal When debug is enabled, store some statistics.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param name
 *   Name of the statistics field to increment in the memory pool.
 * @param n
 *   Number to add to the object-oriented statistics.
 */
#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
#define __MEMPOOL_STAT_ADD(mp, name, n) do {                    \
		unsigned __lcore_id = rte_lcore_id();           \
		if (__lcore_id < RTE_MAX_LCORE) {               \
			mp->stats[__lcore_id].name##_objs += n;	\
			mp->stats[__lcore_id].name##_bulk += 1;	\
		}                                               \
	} while(0)
#define __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, name, n) do {                    \
		unsigned int __lcore_id = rte_lcore_id();       \
		if (__lcore_id < RTE_MAX_LCORE) {               \
			mp->stats[__lcore_id].name##_blks += n;	\
			mp->stats[__lcore_id].name##_bulk += 1;	\
		}                                               \
	} while (0)
#else
#define __MEMPOOL_STAT_ADD(mp, name, n) do {} while(0)
#define __MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, name, n) do {} while (0)
#endif

/**
 * Calculate the size of the mempool header.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param cs
 *   Size of the per-lcore cache.
 */
#define MEMPOOL_HEADER_SIZE(mp, cs) \
	(sizeof(*(mp)) + (((cs) == 0) ? 0 : \
	(sizeof(struct rte_mempool_cache) * RTE_MAX_LCORE)))

/* return the header of a mempool object (internal) */
static inline struct rte_mempool_objhdr *__mempool_get_header(void *obj)
{
	return (struct rte_mempool_objhdr *)RTE_PTR_SUB(obj,
		sizeof(struct rte_mempool_objhdr));
}

/**
 * Return a pointer to the mempool owning this object.
 *
 * @param obj
 *   An object that is owned by a pool. If this is not the case,
 *   the behavior is undefined.
 * @return
 *   A pointer to the mempool structure.
 */
static inline struct rte_mempool *rte_mempool_from_obj(void *obj)
{
	struct rte_mempool_objhdr *hdr = __mempool_get_header(obj);
	return hdr->mp;
}

/* return the trailer of a mempool object (internal) */
static inline struct rte_mempool_objtlr *__mempool_get_trailer(void *obj)
{
	struct rte_mempool *mp = rte_mempool_from_obj(obj);
	return (struct rte_mempool_objtlr *)RTE_PTR_ADD(obj, mp->elt_size);
}

/**
 * @internal Check and update cookies or panic.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param obj_table_const
 *   Pointer to a table of void * pointers (objects).
 * @param n
 *   Index of object in object table.
 * @param free
 *   - 0: object is supposed to be allocated, mark it as free
 *   - 1: object is supposed to be free, mark it as allocated
 *   - 2: just check that cookie is valid (free or allocated)
 */
void rte_mempool_check_cookies(const struct rte_mempool *mp,
	void * const *obj_table_const, unsigned n, int free);

#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
#define __mempool_check_cookies(mp, obj_table_const, n, free) \
	rte_mempool_check_cookies(mp, obj_table_const, n, free)
#else
#define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0)
#endif /* RTE_LIBRTE_MEMPOOL_DEBUG */

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * @internal Check contiguous object blocks and update cookies or panic.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param first_obj_table_const
 *   Pointer to a table of void * pointers (first object of the contiguous
 *   object blocks).
 * @param n
 *   Number of contiguous object blocks.
 * @param free
 *   - 0: object is supposed to be allocated, mark it as free
 *   - 1: object is supposed to be free, mark it as allocated
 *   - 2: just check that cookie is valid (free or allocated)
 */
void rte_mempool_contig_blocks_check_cookies(const struct rte_mempool *mp,
	void * const *first_obj_table_const, unsigned int n, int free);

#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
#define __mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
					      free) \
	rte_mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
						free)
#else
#define __mempool_contig_blocks_check_cookies(mp, first_obj_table_const, n, \
					      free) \
	do {} while (0)
#endif /* RTE_LIBRTE_MEMPOOL_DEBUG */

#define RTE_MEMPOOL_OPS_NAMESIZE 32 /**< Max length of ops struct name. */

/**
 * Prototype for implementation specific data provisioning function.
 *
 * The function should provide the implementation specific memory for
 * use by the other mempool ops functions in a given mempool ops struct.
 * E.g. the default ops provides an instance of the rte_ring for this purpose.
 * it will most likely point to a different type of data structure, and
 * will be transparent to the application programmer.
 * This function should set mp->pool_data.
 */
typedef int (*rte_mempool_alloc_t)(struct rte_mempool *mp);

/**
 * Free the opaque private data pointed to by mp->pool_data pointer.
 */
typedef void (*rte_mempool_free_t)(struct rte_mempool *mp);

/**
 * Enqueue an object into the external pool.
 */
typedef int (*rte_mempool_enqueue_t)(struct rte_mempool *mp,
		void * const *obj_table, unsigned int n);

/**
 * Dequeue an object from the external pool.
 */
typedef int (*rte_mempool_dequeue_t)(struct rte_mempool *mp,
		void **obj_table, unsigned int n);

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * Dequeue a number of contiguous object blocks from the external pool.
 */
typedef int (*rte_mempool_dequeue_contig_blocks_t)(struct rte_mempool *mp,
		 void **first_obj_table, unsigned int n);

/**
 * Return the number of available objects in the external pool.
 */
typedef unsigned (*rte_mempool_get_count)(const struct rte_mempool *mp);

/**
 * Calculate memory size required to store given number of objects.
 *
 * If mempool objects are not required to be IOVA-contiguous
 * (the flag MEMPOOL_F_NO_IOVA_CONTIG is set), min_chunk_size defines
 * virtually contiguous chunk size. Otherwise, if mempool objects must
 * be IOVA-contiguous (the flag MEMPOOL_F_NO_IOVA_CONTIG is clear),
 * min_chunk_size defines IOVA-contiguous chunk size.
 *
 * @param[in] mp
 *   Pointer to the memory pool.
 * @param[in] obj_num
 *   Number of objects.
 * @param[in] pg_shift
 *   LOG2 of the physical pages size. If set to 0, ignore page boundaries.
 * @param[out] min_chunk_size
 *   Location for minimum size of the memory chunk which may be used to
 *   store memory pool objects.
 * @param[out] align
 *   Location for required memory chunk alignment.
 * @return
 *   Required memory size aligned at page boundary.
 */
typedef ssize_t (*rte_mempool_calc_mem_size_t)(const struct rte_mempool *mp,
		uint32_t obj_num,  uint32_t pg_shift,
		size_t *min_chunk_size, size_t *align);

/**
 * Default way to calculate memory size required to store given number of
 * objects.
 *
 * If page boundaries may be ignored, it is just a product of total
 * object size including header and trailer and number of objects.
 * Otherwise, it is a number of pages required to store given number of
 * objects without crossing page boundary.
 *
 * Note that if object size is bigger than page size, then it assumes
 * that pages are grouped in subsets of physically continuous pages big
 * enough to store at least one object.
 *
 * Minimum size of memory chunk is a maximum of the page size and total
 * element size.
 *
 * Required memory chunk alignment is a maximum of page size and cache
 * line size.
 */
ssize_t rte_mempool_op_calc_mem_size_default(const struct rte_mempool *mp,
		uint32_t obj_num, uint32_t pg_shift,
		size_t *min_chunk_size, size_t *align);

/**
 * Function to be called for each populated object.
 *
 * @param[in] mp
 *   A pointer to the mempool structure.
 * @param[in] opaque
 *   An opaque pointer passed to iterator.
 * @param[in] vaddr
 *   Object virtual address.
 * @param[in] iova
 *   Input/output virtual address of the object or RTE_BAD_IOVA.
 */
typedef void (rte_mempool_populate_obj_cb_t)(struct rte_mempool *mp,
		void *opaque, void *vaddr, rte_iova_t iova);

/**
 * Populate memory pool objects using provided memory chunk.
 *
 * Populated objects should be enqueued to the pool, e.g. using
 * rte_mempool_ops_enqueue_bulk().
 *
 * If the given IO address is unknown (iova = RTE_BAD_IOVA),
 * the chunk doesn't need to be physically contiguous (only virtually),
 * and allocated objects may span two pages.
 *
 * @param[in] mp
 *   A pointer to the mempool structure.
 * @param[in] max_objs
 *   Maximum number of objects to be populated.
 * @param[in] vaddr
 *   The virtual address of memory that should be used to store objects.
 * @param[in] iova
 *   The IO address
 * @param[in] len
 *   The length of memory in bytes.
 * @param[in] obj_cb
 *   Callback function to be executed for each populated object.
 * @param[in] obj_cb_arg
 *   An opaque pointer passed to the callback function.
 * @return
 *   The number of objects added on success.
 *   On error, no objects are populated and a negative errno is returned.
 */
typedef int (*rte_mempool_populate_t)(struct rte_mempool *mp,
		unsigned int max_objs,
		void *vaddr, rte_iova_t iova, size_t len,
		rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg);

/**
 * Default way to populate memory pool object using provided memory
 * chunk: just slice objects one by one.
 */
int rte_mempool_op_populate_default(struct rte_mempool *mp,
		unsigned int max_objs,
		void *vaddr, rte_iova_t iova, size_t len,
		rte_mempool_populate_obj_cb_t *obj_cb, void *obj_cb_arg);

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * Get some additional information about a mempool.
 */
typedef int (*rte_mempool_get_info_t)(const struct rte_mempool *mp,
		struct rte_mempool_info *info);


/** Structure defining mempool operations structure */
struct rte_mempool_ops {
	char name[RTE_MEMPOOL_OPS_NAMESIZE]; /**< Name of mempool ops struct. */
	rte_mempool_alloc_t alloc;       /**< Allocate private data. */
	rte_mempool_free_t free;         /**< Free the external pool. */
	rte_mempool_enqueue_t enqueue;   /**< Enqueue an object. */
	rte_mempool_dequeue_t dequeue;   /**< Dequeue an object. */
	rte_mempool_get_count get_count; /**< Get qty of available objs. */
	/**
	 * Optional callback to calculate memory size required to
	 * store specified number of objects.
	 */
	rte_mempool_calc_mem_size_t calc_mem_size;
	/**
	 * Optional callback to populate mempool objects using
	 * provided memory chunk.
	 */
	rte_mempool_populate_t populate;
	/**
	 * Get mempool info
	 */
	rte_mempool_get_info_t get_info;
	/**
	 * Dequeue a number of contiguous object blocks.
	 */
	rte_mempool_dequeue_contig_blocks_t dequeue_contig_blocks;
} __rte_cache_aligned;

#define RTE_MEMPOOL_MAX_OPS_IDX 16  /**< Max registered ops structs */

/**
 * Structure storing the table of registered ops structs, each of which contain
 * the function pointers for the mempool ops functions.
 * Each process has its own storage for this ops struct array so that
 * the mempools can be shared across primary and secondary processes.
 * The indices used to access the array are valid across processes, whereas
 * any function pointers stored directly in the mempool struct would not be.
 * This results in us simply having "ops_index" in the mempool struct.
 */
struct rte_mempool_ops_table {
	rte_spinlock_t sl;     /**< Spinlock for add/delete. */
	uint32_t num_ops;      /**< Number of used ops structs in the table. */
	/**
	 * Storage for all possible ops structs.
	 */
	struct rte_mempool_ops ops[RTE_MEMPOOL_MAX_OPS_IDX];
} __rte_cache_aligned;

/** Array of registered ops structs. */
extern struct rte_mempool_ops_table rte_mempool_ops_table;

/**
 * @internal Get the mempool ops struct from its index.
 *
 * @param ops_index
 *   The index of the ops struct in the ops struct table. It must be a valid
 *   index: (0 <= idx < num_ops).
 * @return
 *   The pointer to the ops struct in the table.
 */
static inline struct rte_mempool_ops *
rte_mempool_get_ops(int ops_index)
{
	RTE_VERIFY((ops_index >= 0) && (ops_index < RTE_MEMPOOL_MAX_OPS_IDX));

	return &rte_mempool_ops_table.ops[ops_index];
}

/**
 * @internal Wrapper for mempool_ops alloc callback.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @return
 *   - 0: Success; successfully allocated mempool pool_data.
 *   - <0: Error; code of alloc function.
 */
int
rte_mempool_ops_alloc(struct rte_mempool *mp);

/**
 * @internal Wrapper for mempool_ops dequeue callback.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param obj_table
 *   Pointer to a table of void * pointers (objects).
 * @param n
 *   Number of objects to get.
 * @return
 *   - 0: Success; got n objects.
 *   - <0: Error; code of dequeue function.
 */
static inline int
rte_mempool_ops_dequeue_bulk(struct rte_mempool *mp,
		void **obj_table, unsigned n)
{
	struct rte_mempool_ops *ops;

	ops = rte_mempool_get_ops(mp->ops_index);
	return ops->dequeue(mp, obj_table, n);
}

/**
 * @internal Wrapper for mempool_ops dequeue_contig_blocks callback.
 *
 * @param[in] mp
 *   Pointer to the memory pool.
 * @param[out] first_obj_table
 *   Pointer to a table of void * pointers (first objects).
 * @param[in] n
 *   Number of blocks to get.
 * @return
 *   - 0: Success; got n objects.
 *   - <0: Error; code of dequeue function.
 */
static inline int
rte_mempool_ops_dequeue_contig_blocks(struct rte_mempool *mp,
		void **first_obj_table, unsigned int n)
{
	struct rte_mempool_ops *ops;

	ops = rte_mempool_get_ops(mp->ops_index);
	RTE_ASSERT(ops->dequeue_contig_blocks != NULL);
	return ops->dequeue_contig_blocks(mp, first_obj_table, n);
}

/**
 * @internal wrapper for mempool_ops enqueue callback.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param obj_table
 *   Pointer to a table of void * pointers (objects).
 * @param n
 *   Number of objects to put.
 * @return
 *   - 0: Success; n objects supplied.
 *   - <0: Error; code of enqueue function.
 */
static inline int
rte_mempool_ops_enqueue_bulk(struct rte_mempool *mp, void * const *obj_table,
		unsigned n)
{
	struct rte_mempool_ops *ops;

	ops = rte_mempool_get_ops(mp->ops_index);
	return ops->enqueue(mp, obj_table, n);
}

/**
 * @internal wrapper for mempool_ops get_count callback.
 *
 * @param mp
 *   Pointer to the memory pool.
 * @return
 *   The number of available objects in the external pool.
 */
unsigned
rte_mempool_ops_get_count(const struct rte_mempool *mp);

/**
 * @internal wrapper for mempool_ops calc_mem_size callback.
 * API to calculate size of memory required to store specified number of
 * object.
 *
 * @param[in] mp
 *   Pointer to the memory pool.
 * @param[in] obj_num
 *   Number of objects.
 * @param[in] pg_shift
 *   LOG2 of the physical pages size. If set to 0, ignore page boundaries.
 * @param[out] min_chunk_size
 *   Location for minimum size of the memory chunk which may be used to
 *   store memory pool objects.
 * @param[out] align
 *   Location for required memory chunk alignment.
 * @return
 *   Required memory size aligned at page boundary.
 */
ssize_t rte_mempool_ops_calc_mem_size(const struct rte_mempool *mp,
				      uint32_t obj_num, uint32_t pg_shift,
				      size_t *min_chunk_size, size_t *align);

/**
 * @internal wrapper for mempool_ops populate callback.
 *
 * Populate memory pool objects using provided memory chunk.
 *
 * @param[in] mp
 *   A pointer to the mempool structure.
 * @param[in] max_objs
 *   Maximum number of objects to be populated.
 * @param[in] vaddr
 *   The virtual address of memory that should be used to store objects.
 * @param[in] iova
 *   The IO address
 * @param[in] len
 *   The length of memory in bytes.
 * @param[in] obj_cb
 *   Callback function to be executed for each populated object.
 * @param[in] obj_cb_arg
 *   An opaque pointer passed to the callback function.
 * @return
 *   The number of objects added on success.
 *   On error, no objects are populated and a negative errno is returned.
 */
int rte_mempool_ops_populate(struct rte_mempool *mp, unsigned int max_objs,
			     void *vaddr, rte_iova_t iova, size_t len,
			     rte_mempool_populate_obj_cb_t *obj_cb,
			     void *obj_cb_arg);

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * Wrapper for mempool_ops get_info callback.
 *
 * @param[in] mp
 *   Pointer to the memory pool.
 * @param[out] info
 *   Pointer to the rte_mempool_info structure
 * @return
 *   - 0: Success; The mempool driver supports retrieving supplementary
 *        mempool information
 *   - -ENOTSUP - doesn't support get_info ops (valid case).
 */
__rte_experimental
int rte_mempool_ops_get_info(const struct rte_mempool *mp,
			 struct rte_mempool_info *info);

/**
 * @internal wrapper for mempool_ops free callback.
 *
 * @param mp
 *   Pointer to the memory pool.
 */
void
rte_mempool_ops_free(struct rte_mempool *mp);

/**
 * Set the ops of a mempool.
 *
 * This can only be done on a mempool that is not populated, i.e. just after
 * a call to rte_mempool_create_empty().
 *
 * @param mp
 *   Pointer to the memory pool.
 * @param name
 *   Name of the ops structure to use for this mempool.
 * @param pool_config
 *   Opaque data that can be passed by the application to the ops functions.
 * @return
 *   - 0: Success; the mempool is now using the requested ops functions.
 *   - -EINVAL - Invalid ops struct name provided.
 *   - -EEXIST - mempool already has an ops struct assigned.
 */
int
rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,
		void *pool_config);

/**
 * Register mempool operations.
 *
 * @param ops
 *   Pointer to an ops structure to register.
 * @return
 *   - >=0: Success; return the index of the ops struct in the table.
 *   - -EINVAL - some missing callbacks while registering ops struct.
 *   - -ENOSPC - the maximum number of ops structs has been reached.
 */
int rte_mempool_register_ops(const struct rte_mempool_ops *ops);

/**
 * Macro to statically register the ops of a mempool handler.
 * Note that the rte_mempool_register_ops fails silently here when
 * more than RTE_MEMPOOL_MAX_OPS_IDX is registered.
 */
#define MEMPOOL_REGISTER_OPS(ops)				\
	RTE_INIT(mp_hdlr_init_##ops)				\
	{							\
		rte_mempool_register_ops(&ops);			\
	}

/**
 * An object callback function for mempool.
 *
 * Used by rte_mempool_create() and rte_mempool_obj_iter().
 */
typedef void (rte_mempool_obj_cb_t)(struct rte_mempool *mp,
		void *opaque, void *obj, unsigned obj_idx);
typedef rte_mempool_obj_cb_t rte_mempool_obj_ctor_t; /* compat */

/**
 * A memory callback function for mempool.
 *
 * Used by rte_mempool_mem_iter().
 */
typedef void (rte_mempool_mem_cb_t)(struct rte_mempool *mp,
		void *opaque, struct rte_mempool_memhdr *memhdr,
		unsigned mem_idx);

/**
 * A mempool constructor callback function.
 *
 * Arguments are the mempool and the opaque pointer given by the user in
 * rte_mempool_create().
 */
typedef void (rte_mempool_ctor_t)(struct rte_mempool *, void *);

/**
 * Create a new mempool named *name* in memory.
 *
 * This function uses ``rte_memzone_reserve()`` to allocate memory. The
 * pool contains n elements of elt_size. Its size is set to n.
 *
 * @param name
 *   The name of the mempool.
 * @param n
 *   The number of elements in the mempool. The optimum size (in terms of
 *   memory usage) for a mempool is when n is a power of two minus one:
 *   n = (2^q - 1).
 * @param elt_size
 *   The size of each element.
 * @param cache_size
 *   If cache_size is non-zero, the rte_mempool library will try to
 *   limit the accesses to the common lockless pool, by maintaining a
 *   per-lcore object cache. This argument must be lower or equal to
 *   CONFIG_RTE_MEMPOOL_CACHE_MAX_SIZE and n / 1.5. It is advised to choose
 *   cache_size to have "n modulo cache_size == 0": if this is
 *   not the case, some elements will always stay in the pool and will
 *   never be used. The access to the per-lcore table is of course
 *   faster than the multi-producer/consumer pool. The cache can be
 *   disabled if the cache_size argument is set to 0; it can be useful to
 *   avoid losing objects in cache.
 * @param private_data_size
 *   The size of the private data appended after the mempool
 *   structure. This is useful for storing some private data after the
 *   mempool structure, as is done for rte_mbuf_pool for example.
 * @param mp_init
 *   A function pointer that is called for initialization of the pool,
 *   before object initialization. The user can initialize the private
 *   data in this function if needed. This parameter can be NULL if
 *   not needed.
 * @param mp_init_arg
 *   An opaque pointer to data that can be used in the mempool
 *   constructor function.
 * @param obj_init
 *   A function pointer that is called for each object at
 *   initialization of the pool. The user can set some meta data in
 *   objects if needed. This parameter can be NULL if not needed.
 *   The obj_init() function takes the mempool pointer, the init_arg,
 *   the object pointer and the object number as parameters.
 * @param obj_init_arg
 *   An opaque pointer to data that can be used as an argument for
 *   each call to the object constructor function.
 * @param socket_id
 *   The *socket_id* argument is the socket identifier in the case of
 *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
 *   constraint for the reserved zone.
 * @param flags
 *   The *flags* arguments is an OR of following flags:
 *   - MEMPOOL_F_NO_SPREAD: By default, objects addresses are spread
 *     between channels in RAM: the pool allocator will add padding
 *     between objects depending on the hardware configuration. See
 *     Memory alignment constraints for details. If this flag is set,
 *     the allocator will just align them to a cache line.
 *   - MEMPOOL_F_NO_CACHE_ALIGN: By default, the returned objects are
 *     cache-aligned. This flag removes this constraint, and no
 *     padding will be present between objects. This flag implies
 *     MEMPOOL_F_NO_SPREAD.
 *   - MEMPOOL_F_SP_PUT: If this flag is set, the default behavior
 *     when using rte_mempool_put() or rte_mempool_put_bulk() is
 *     "single-producer". Otherwise, it is "multi-producers".
 *   - MEMPOOL_F_SC_GET: If this flag is set, the default behavior
 *     when using rte_mempool_get() or rte_mempool_get_bulk() is
 *     "single-consumer". Otherwise, it is "multi-consumers".
 *   - MEMPOOL_F_NO_IOVA_CONTIG: If set, allocated objects won't
 *     necessarily be contiguous in IO memory.
 * @return
 *   The pointer to the new allocated mempool, on success. NULL on error
 *   with rte_errno set appropriately. Possible rte_errno values include:
 *    - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
 *    - E_RTE_SECONDARY - function was called from a secondary process instance
 *    - EINVAL - cache size provided is too large
 *    - ENOSPC - the maximum number of memzones has already been allocated
 *    - EEXIST - a memzone with the same name already exists
 *    - ENOMEM - no appropriate memory area found in which to create memzone
 */
struct rte_mempool *
rte_mempool_create(const char *name, unsigned n, unsigned elt_size,
		   unsigned cache_size, unsigned private_data_size,
		   rte_mempool_ctor_t *mp_init, void *mp_init_arg,
		   rte_mempool_obj_cb_t *obj_init, void *obj_init_arg,
		   int socket_id, unsigned flags);

/**
 * Create an empty mempool
 *
 * The mempool is allocated and initialized, but it is not populated: no
 * memory is allocated for the mempool elements. The user has to call
 * rte_mempool_populate_*() to add memory chunks to the pool. Once
 * populated, the user may also want to initialize each object with
 * rte_mempool_obj_iter().
 *
 * @param name
 *   The name of the mempool.
 * @param n
 *   The maximum number of elements that can be added in the mempool.
 *   The optimum size (in terms of memory usage) for a mempool is when n
 *   is a power of two minus one: n = (2^q - 1).
 * @param elt_size
 *   The size of each element.
 * @param cache_size
 *   Size of the cache. See rte_mempool_create() for details.
 * @param private_data_size
 *   The size of the private data appended after the mempool
 *   structure. This is useful for storing some private data after the
 *   mempool structure, as is done for rte_mbuf_pool for example.
 * @param socket_id
 *   The *socket_id* argument is the socket identifier in the case of
 *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
 *   constraint for the reserved zone.
 * @param flags
 *   Flags controlling the behavior of the mempool. See
 *   rte_mempool_create() for details.
 * @return
 *   The pointer to the new allocated mempool, on success. NULL on error
 *   with rte_errno set appropriately. See rte_mempool_create() for details.
 */
struct rte_mempool *
rte_mempool_create_empty(const char *name, unsigned n, unsigned elt_size,
	unsigned cache_size, unsigned private_data_size,
	int socket_id, unsigned flags);
/**
 * Free a mempool
 *
 * Unlink the mempool from global list, free the memory chunks, and all
 * memory referenced by the mempool. The objects must not be used by
 * other cores as they will be freed.
 *
 * @param mp
 *   A pointer to the mempool structure.
 */
void
rte_mempool_free(struct rte_mempool *mp);

/**
 * Add physically contiguous memory for objects in the pool at init
 *
 * Add a virtually and physically contiguous memory chunk in the pool
 * where objects can be instantiated.
 *
 * If the given IO address is unknown (iova = RTE_BAD_IOVA),
 * the chunk doesn't need to be physically contiguous (only virtually),
 * and allocated objects may span two pages.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param vaddr
 *   The virtual address of memory that should be used to store objects.
 * @param iova
 *   The IO address
 * @param len
 *   The length of memory in bytes.
 * @param free_cb
 *   The callback used to free this chunk when destroying the mempool.
 * @param opaque
 *   An opaque argument passed to free_cb.
 * @return
 *   The number of objects added on success.
 *   On error, the chunk is not added in the memory list of the
 *   mempool and a negative errno is returned.
 */
int rte_mempool_populate_iova(struct rte_mempool *mp, char *vaddr,
	rte_iova_t iova, size_t len, rte_mempool_memchunk_free_cb_t *free_cb,
	void *opaque);

/**
 * Add virtually contiguous memory for objects in the pool at init
 *
 * Add a virtually contiguous memory chunk in the pool where objects can
 * be instantiated.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param addr
 *   The virtual address of memory that should be used to store objects.
 *   Must be page-aligned.
 * @param len
 *   The length of memory in bytes. Must be page-aligned.
 * @param pg_sz
 *   The size of memory pages in this virtual area.
 * @param free_cb
 *   The callback used to free this chunk when destroying the mempool.
 * @param opaque
 *   An opaque argument passed to free_cb.
 * @return
 *   The number of objects added on success.
 *   On error, the chunk is not added in the memory list of the
 *   mempool and a negative errno is returned.
 */
int
rte_mempool_populate_virt(struct rte_mempool *mp, char *addr,
	size_t len, size_t pg_sz, rte_mempool_memchunk_free_cb_t *free_cb,
	void *opaque);

/**
 * Add memory for objects in the pool at init
 *
 * This is the default function used by rte_mempool_create() to populate
 * the mempool. It adds memory allocated using rte_memzone_reserve().
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   The number of objects added on success.
 *   On error, the chunk is not added in the memory list of the
 *   mempool and a negative errno is returned.
 */
int rte_mempool_populate_default(struct rte_mempool *mp);

/**
 * Add memory from anonymous mapping for objects in the pool at init
 *
 * This function mmap an anonymous memory zone that is locked in
 * memory to store the objects of the mempool.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   The number of objects added on success.
 *   On error, the chunk is not added in the memory list of the
 *   mempool and a negative errno is returned.
 */
int rte_mempool_populate_anon(struct rte_mempool *mp);

/**
 * Call a function for each mempool element
 *
 * Iterate across all objects attached to a rte_mempool and call the
 * callback function on it.
 *
 * @param mp
 *   A pointer to an initialized mempool.
 * @param obj_cb
 *   A function pointer that is called for each object.
 * @param obj_cb_arg
 *   An opaque pointer passed to the callback function.
 * @return
 *   Number of objects iterated.
 */
uint32_t rte_mempool_obj_iter(struct rte_mempool *mp,
	rte_mempool_obj_cb_t *obj_cb, void *obj_cb_arg);

/**
 * Call a function for each mempool memory chunk
 *
 * Iterate across all memory chunks attached to a rte_mempool and call
 * the callback function on it.
 *
 * @param mp
 *   A pointer to an initialized mempool.
 * @param mem_cb
 *   A function pointer that is called for each memory chunk.
 * @param mem_cb_arg
 *   An opaque pointer passed to the callback function.
 * @return
 *   Number of memory chunks iterated.
 */
uint32_t rte_mempool_mem_iter(struct rte_mempool *mp,
	rte_mempool_mem_cb_t *mem_cb, void *mem_cb_arg);

/**
 * Dump the status of the mempool to a file.
 *
 * @param f
 *   A pointer to a file for output
 * @param mp
 *   A pointer to the mempool structure.
 */
void rte_mempool_dump(FILE *f, struct rte_mempool *mp);

/**
 * Create a user-owned mempool cache.
 *
 * This can be used by non-EAL threads to enable caching when they
 * interact with a mempool.
 *
 * @param size
 *   The size of the mempool cache. See rte_mempool_create()'s cache_size
 *   parameter description for more information. The same limits and
 *   considerations apply here too.
 * @param socket_id
 *   The socket identifier in the case of NUMA. The value can be
 *   SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone.
 */
struct rte_mempool_cache *
rte_mempool_cache_create(uint32_t size, int socket_id);

/**
 * Free a user-owned mempool cache.
 *
 * @param cache
 *   A pointer to the mempool cache.
 */
void
rte_mempool_cache_free(struct rte_mempool_cache *cache);

/**
 * Get a pointer to the per-lcore default mempool cache.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param lcore_id
 *   The logical core id.
 * @return
 *   A pointer to the mempool cache or NULL if disabled or non-EAL thread.
 */
static __rte_always_inline struct rte_mempool_cache *
rte_mempool_default_cache(struct rte_mempool *mp, unsigned lcore_id)
{
	if (mp->cache_size == 0)
		return NULL;

	if (lcore_id >= RTE_MAX_LCORE)
		return NULL;

	return &mp->local_cache[lcore_id];
}

/**
 * Flush a user-owned mempool cache to the specified mempool.
 *
 * @param cache
 *   A pointer to the mempool cache.
 * @param mp
 *   A pointer to the mempool.
 */
static __rte_always_inline void
rte_mempool_cache_flush(struct rte_mempool_cache *cache,
			struct rte_mempool *mp)
{
	if (cache == NULL)
		cache = rte_mempool_default_cache(mp, rte_lcore_id());
	if (cache == NULL || cache->len == 0)
		return;
	rte_mempool_ops_enqueue_bulk(mp, cache->objs, cache->len);
	cache->len = 0;
}

/**
 * @internal Put several objects back in the mempool; used internally.
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects).
 * @param n
 *   The number of objects to store back in the mempool, must be strictly
 *   positive.
 * @param cache
 *   A pointer to a mempool cache structure. May be NULL if not needed.
 */
static __rte_always_inline void
__mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
		      unsigned int n, struct rte_mempool_cache *cache)
{
	void **cache_objs;

	/* increment stat now, adding in mempool always success */
	__MEMPOOL_STAT_ADD(mp, put, n);

	/* No cache provided or if put would overflow mem allocated for cache */
	if (unlikely(cache == NULL || n > RTE_MEMPOOL_CACHE_MAX_SIZE))
		goto ring_enqueue;

	cache_objs = &cache->objs[cache->len];

	/*
	 * The cache follows the following algorithm
	 *   1. Add the objects to the cache
	 *   2. Anything greater than the cache min value (if it crosses the
	 *   cache flush threshold) is flushed to the ring.
	 */

	/* Add elements back into the cache */
	rte_memcpy(&cache_objs[0], obj_table, sizeof(void *) * n);

	cache->len += n;

	if (cache->len >= cache->flushthresh) {
		rte_mempool_ops_enqueue_bulk(mp, &cache->objs[cache->size],
				cache->len - cache->size);
		cache->len = cache->size;
	}

	return;

ring_enqueue:

	/* push remaining objects in ring */
#ifdef RTE_LIBRTE_MEMPOOL_DEBUG
	if (rte_mempool_ops_enqueue_bulk(mp, obj_table, n) < 0)
		rte_panic("cannot put objects in mempool\n");
#else
	rte_mempool_ops_enqueue_bulk(mp, obj_table, n);
#endif
}


/**
 * Put several objects back in the mempool.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects).
 * @param n
 *   The number of objects to add in the mempool from the obj_table.
 * @param cache
 *   A pointer to a mempool cache structure. May be NULL if not needed.
 */
static __rte_always_inline void
rte_mempool_generic_put(struct rte_mempool *mp, void * const *obj_table,
			unsigned int n, struct rte_mempool_cache *cache)
{
	__mempool_check_cookies(mp, obj_table, n, 0);
	__mempool_generic_put(mp, obj_table, n, cache);
}

/**
 * Put several objects back in the mempool.
 *
 * This function calls the multi-producer or the single-producer
 * version depending on the default behavior that was specified at
 * mempool creation time (see flags).
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects).
 * @param n
 *   The number of objects to add in the mempool from obj_table.
 */
static __rte_always_inline void
rte_mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table,
		     unsigned int n)
{
	struct rte_mempool_cache *cache;
	cache = rte_mempool_default_cache(mp, rte_lcore_id());
	rte_mempool_generic_put(mp, obj_table, n, cache);
}

/**
 * Put one object back in the mempool.
 *
 * This function calls the multi-producer or the single-producer
 * version depending on the default behavior that was specified at
 * mempool creation time (see flags).
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj
 *   A pointer to the object to be added.
 */
static __rte_always_inline void
rte_mempool_put(struct rte_mempool *mp, void *obj)
{
	rte_mempool_put_bulk(mp, &obj, 1);
}

/**
 * @internal Get several objects from the mempool; used internally.
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects).
 * @param n
 *   The number of objects to get, must be strictly positive.
 * @param cache
 *   A pointer to a mempool cache structure. May be NULL if not needed.
 * @return
 *   - >=0: Success; number of objects supplied.
 *   - <0: Error; code of ring dequeue function.
 */
static __rte_always_inline int
__mempool_generic_get(struct rte_mempool *mp, void **obj_table,
		      unsigned int n, struct rte_mempool_cache *cache)
{
	int ret;
	uint32_t index, len;
	void **cache_objs;

	/* No cache provided or cannot be satisfied from cache */
	if (unlikely(cache == NULL || n >= cache->size))
		goto ring_dequeue;

	cache_objs = cache->objs;

	/* Can this be satisfied from the cache? */
	if (cache->len < n) {
		/* No. Backfill the cache first, and then fill from it */
		uint32_t req = n + (cache->size - cache->len);

		/* How many do we require i.e. number to fill the cache + the request */
		ret = rte_mempool_ops_dequeue_bulk(mp,
			&cache->objs[cache->len], req);
		if (unlikely(ret < 0)) {
			/*
			 * In the off chance that we are buffer constrained,
			 * where we are not able to allocate cache + n, go to
			 * the ring directly. If that fails, we are truly out of
			 * buffers.
			 */
			goto ring_dequeue;
		}

		cache->len += req;
	}

	/* Now fill in the response ... */
	for (index = 0, len = cache->len - 1; index < n; ++index, len--, obj_table++)
		*obj_table = cache_objs[len];

	cache->len -= n;

	__MEMPOOL_STAT_ADD(mp, get_success, n);

	return 0;

ring_dequeue:

	/* get remaining objects from ring */
	ret = rte_mempool_ops_dequeue_bulk(mp, obj_table, n);

	if (ret < 0)
		__MEMPOOL_STAT_ADD(mp, get_fail, n);
	else
		__MEMPOOL_STAT_ADD(mp, get_success, n);

	return ret;
}

/**
 * Get several objects from the mempool.
 *
 * If cache is enabled, objects will be retrieved first from cache,
 * subsequently from the common pool. Note that it can return -ENOENT when
 * the local cache and common pool are empty, even if cache from other
 * lcores are full.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects) that will be filled.
 * @param n
 *   The number of objects to get from mempool to obj_table.
 * @param cache
 *   A pointer to a mempool cache structure. May be NULL if not needed.
 * @return
 *   - 0: Success; objects taken.
 *   - -ENOENT: Not enough entries in the mempool; no object is retrieved.
 */
static __rte_always_inline int
rte_mempool_generic_get(struct rte_mempool *mp, void **obj_table,
			unsigned int n, struct rte_mempool_cache *cache)
{
	int ret;
	ret = __mempool_generic_get(mp, obj_table, n, cache);
	if (ret == 0)
		__mempool_check_cookies(mp, obj_table, n, 1);
	return ret;
}

/**
 * Get several objects from the mempool.
 *
 * This function calls the multi-consumers or the single-consumer
 * version, depending on the default behaviour that was specified at
 * mempool creation time (see flags).
 *
 * If cache is enabled, objects will be retrieved first from cache,
 * subsequently from the common pool. Note that it can return -ENOENT when
 * the local cache and common pool are empty, even if cache from other
 * lcores are full.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_table
 *   A pointer to a table of void * pointers (objects) that will be filled.
 * @param n
 *   The number of objects to get from the mempool to obj_table.
 * @return
 *   - 0: Success; objects taken
 *   - -ENOENT: Not enough entries in the mempool; no object is retrieved.
 */
static __rte_always_inline int
rte_mempool_get_bulk(struct rte_mempool *mp, void **obj_table, unsigned int n)
{
	struct rte_mempool_cache *cache;
	cache = rte_mempool_default_cache(mp, rte_lcore_id());
	return rte_mempool_generic_get(mp, obj_table, n, cache);
}

/**
 * Get one object from the mempool.
 *
 * This function calls the multi-consumers or the single-consumer
 * version, depending on the default behavior that was specified at
 * mempool creation (see flags).
 *
 * If cache is enabled, objects will be retrieved first from cache,
 * subsequently from the common pool. Note that it can return -ENOENT when
 * the local cache and common pool are empty, even if cache from other
 * lcores are full.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param obj_p
 *   A pointer to a void * pointer (object) that will be filled.
 * @return
 *   - 0: Success; objects taken.
 *   - -ENOENT: Not enough entries in the mempool; no object is retrieved.
 */
static __rte_always_inline int
rte_mempool_get(struct rte_mempool *mp, void **obj_p)
{
	return rte_mempool_get_bulk(mp, obj_p, 1);
}

/**
 * @warning
 * @b EXPERIMENTAL: this API may change without prior notice.
 *
 * Get a contiguous blocks of objects from the mempool.
 *
 * If cache is enabled, consider to flush it first, to reuse objects
 * as soon as possible.
 *
 * The application should check that the driver supports the operation
 * by calling rte_mempool_ops_get_info() and checking that `contig_block_size`
 * is not zero.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @param first_obj_table
 *   A pointer to a pointer to the first object in each block.
 * @param n
 *   The number of blocks to get from mempool.
 * @return
 *   - 0: Success; blocks taken.
 *   - -ENOBUFS: Not enough entries in the mempool; no object is retrieved.
 *   - -EOPNOTSUPP: The mempool driver does not support block dequeue
 */
static __rte_always_inline int
__rte_experimental
rte_mempool_get_contig_blocks(struct rte_mempool *mp,
			      void **first_obj_table, unsigned int n)
{
	int ret;

	ret = rte_mempool_ops_dequeue_contig_blocks(mp, first_obj_table, n);
	if (ret == 0) {
		__MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, get_success, n);
		__mempool_contig_blocks_check_cookies(mp, first_obj_table, n,
						      1);
	} else {
		__MEMPOOL_CONTIG_BLOCKS_STAT_ADD(mp, get_fail, n);
	}

	return ret;
}

/**
 * Return the number of entries in the mempool.
 *
 * When cache is enabled, this function has to browse the length of
 * all lcores, so it should not be used in a data path, but only for
 * debug purposes. User-owned mempool caches are not accounted for.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   The number of entries in the mempool.
 */
unsigned int rte_mempool_avail_count(const struct rte_mempool *mp);

/**
 * Return the number of elements which have been allocated from the mempool
 *
 * When cache is enabled, this function has to browse the length of
 * all lcores, so it should not be used in a data path, but only for
 * debug purposes.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   The number of free entries in the mempool.
 */
unsigned int
rte_mempool_in_use_count(const struct rte_mempool *mp);

/**
 * Test if the mempool is full.
 *
 * When cache is enabled, this function has to browse the length of all
 * lcores, so it should not be used in a data path, but only for debug
 * purposes. User-owned mempool caches are not accounted for.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   - 1: The mempool is full.
 *   - 0: The mempool is not full.
 */
static inline int
rte_mempool_full(const struct rte_mempool *mp)
{
	return !!(rte_mempool_avail_count(mp) == mp->size);
}

/**
 * Test if the mempool is empty.
 *
 * When cache is enabled, this function has to browse the length of all
 * lcores, so it should not be used in a data path, but only for debug
 * purposes. User-owned mempool caches are not accounted for.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   - 1: The mempool is empty.
 *   - 0: The mempool is not empty.
 */
static inline int
rte_mempool_empty(const struct rte_mempool *mp)
{
	return !!(rte_mempool_avail_count(mp) == 0);
}

/**
 * Return the IO address of elt, which is an element of the pool mp.
 *
 * @param elt
 *   A pointer (virtual address) to the element of the pool.
 * @return
 *   The IO address of the elt element.
 *   If the mempool was created with MEMPOOL_F_NO_IOVA_CONTIG, the
 *   returned value is RTE_BAD_IOVA.
 */
static inline rte_iova_t
rte_mempool_virt2iova(const void *elt)
{
	const struct rte_mempool_objhdr *hdr;
	hdr = (const struct rte_mempool_objhdr *)RTE_PTR_SUB(elt,
		sizeof(*hdr));
	return hdr->iova;
}

/**
 * Check the consistency of mempool objects.
 *
 * Verify the coherency of fields in the mempool structure. Also check
 * that the cookies of mempool objects (even the ones that are not
 * present in pool) have a correct value. If not, a panic will occur.
 *
 * @param mp
 *   A pointer to the mempool structure.
 */
void rte_mempool_audit(struct rte_mempool *mp);

/**
 * Return a pointer to the private data in an mempool structure.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   A pointer to the private data.
 */
static inline void *rte_mempool_get_priv(struct rte_mempool *mp)
{
	return (char *)mp +
		MEMPOOL_HEADER_SIZE(mp, mp->cache_size);
}

/**
 * Dump the status of all mempools on the console
 *
 * @param f
 *   A pointer to a file for output
 */
void rte_mempool_list_dump(FILE *f);

/**
 * Search a mempool from its name
 *
 * @param name
 *   The name of the mempool.
 * @return
 *   The pointer to the mempool matching the name, or NULL if not found.
 *   NULL on error
 *   with rte_errno set appropriately. Possible rte_errno values include:
 *    - ENOENT - required entry not available to return.
 *
 */
struct rte_mempool *rte_mempool_lookup(const char *name);

/**
 * Get the header, trailer and total size of a mempool element.
 *
 * Given a desired size of the mempool element and mempool flags,
 * calculates header, trailer, body and total sizes of the mempool object.
 *
 * @param elt_size
 *   The size of each element, without header and trailer.
 * @param flags
 *   The flags used for the mempool creation.
 *   Consult rte_mempool_create() for more information about possible values.
 *   The size of each element.
 * @param sz
 *   The calculated detailed size the mempool object. May be NULL.
 * @return
 *   Total size of the mempool object.
 */
uint32_t rte_mempool_calc_obj_size(uint32_t elt_size, uint32_t flags,
	struct rte_mempool_objsz *sz);

/**
 * Walk list of all memory pools
 *
 * @param func
 *   Iterator function
 * @param arg
 *   Argument passed to iterator
 */
void rte_mempool_walk(void (*func)(struct rte_mempool *, void *arg),
		      void *arg);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_MEMPOOL_H_ */