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
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation.
 * Copyright 2014 6WIND S.A.
 */

#ifndef _RTE_MBUF_H_
#define _RTE_MBUF_H_

/**
 * @file
 * RTE Mbuf
 *
 * The mbuf library provides the ability to create and destroy buffers
 * that may be used by the RTE application to store message
 * buffers. The message buffers are stored in a mempool, using the
 * RTE mempool library.
 *
 * The preferred way to create a mbuf pool is to use
 * rte_pktmbuf_pool_create(). However, in some situations, an
 * application may want to have more control (ex: populate the pool with
 * specific memory), in this case it is possible to use functions from
 * rte_mempool. See how rte_pktmbuf_pool_create() is implemented for
 * details.
 *
 * This library provides an API to allocate/free packet mbufs, which are
 * used to carry network packets.
 *
 * To understand the concepts of packet buffers or mbufs, you
 * should read "TCP/IP Illustrated, Volume 2: The Implementation,
 * Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens"
 * http://www.kohala.com/start/tcpipiv2.html
 */

#include <stdint.h>
#include <rte_compat.h>
#include <rte_common.h>
#include <rte_config.h>
#include <rte_mempool.h>
#include <rte_memory.h>
#include <rte_prefetch.h>
#include <rte_branch_prediction.h>
#include <rte_byteorder.h>
#include <rte_mbuf_ptype.h>
#include <rte_mbuf_core.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Get the name of a RX offload flag
 *
 * @param mask
 *   The mask describing the flag.
 * @return
 *   The name of this flag, or NULL if it's not a valid RX flag.
 */
const char *rte_get_rx_ol_flag_name(uint64_t mask);

/**
 * Dump the list of RX offload flags in a buffer
 *
 * @param mask
 *   The mask describing the RX flags.
 * @param buf
 *   The output buffer.
 * @param buflen
 *   The length of the buffer.
 * @return
 *   0 on success, (-1) on error.
 */
int rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);

/**
 * Get the name of a TX offload flag
 *
 * @param mask
 *   The mask describing the flag. Usually only one bit must be set.
 *   Several bits can be given if they belong to the same mask.
 *   Ex: PKT_TX_L4_MASK.
 * @return
 *   The name of this flag, or NULL if it's not a valid TX flag.
 */
const char *rte_get_tx_ol_flag_name(uint64_t mask);

/**
 * Dump the list of TX offload flags in a buffer
 *
 * @param mask
 *   The mask describing the TX flags.
 * @param buf
 *   The output buffer.
 * @param buflen
 *   The length of the buffer.
 * @return
 *   0 on success, (-1) on error.
 */
int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);

/**
 * Prefetch the first part of the mbuf
 *
 * The first 64 bytes of the mbuf corresponds to fields that are used early
 * in the receive path. If the cache line of the architecture is higher than
 * 64B, the second part will also be prefetched.
 *
 * @param m
 *   The pointer to the mbuf.
 */
static inline void
rte_mbuf_prefetch_part1(struct rte_mbuf *m)
{
	rte_prefetch0(&m->cacheline0);
}

/**
 * Prefetch the second part of the mbuf
 *
 * The next 64 bytes of the mbuf corresponds to fields that are used in the
 * transmit path. If the cache line of the architecture is higher than 64B,
 * this function does nothing as it is expected that the full mbuf is
 * already in cache.
 *
 * @param m
 *   The pointer to the mbuf.
 */
static inline void
rte_mbuf_prefetch_part2(struct rte_mbuf *m)
{
#if RTE_CACHE_LINE_SIZE == 64
	rte_prefetch0(&m->cacheline1);
#else
	RTE_SET_USED(m);
#endif
}


static inline uint16_t rte_pktmbuf_priv_size(struct rte_mempool *mp);

/**
 * Return the IO address of the beginning of the mbuf data
 *
 * @param mb
 *   The pointer to the mbuf.
 * @return
 *   The IO address of the beginning of the mbuf data
 */
static inline rte_iova_t
rte_mbuf_data_iova(const struct rte_mbuf *mb)
{
	return mb->buf_iova + mb->data_off;
}

__rte_deprecated
static inline phys_addr_t
rte_mbuf_data_dma_addr(const struct rte_mbuf *mb)
{
	return rte_mbuf_data_iova(mb);
}

/**
 * Return the default IO address of the beginning of the mbuf data
 *
 * This function is used by drivers in their receive function, as it
 * returns the location where data should be written by the NIC, taking
 * the default headroom in account.
 *
 * @param mb
 *   The pointer to the mbuf.
 * @return
 *   The IO address of the beginning of the mbuf data
 */
static inline rte_iova_t
rte_mbuf_data_iova_default(const struct rte_mbuf *mb)
{
	return mb->buf_iova + RTE_PKTMBUF_HEADROOM;
}

__rte_deprecated
static inline phys_addr_t
rte_mbuf_data_dma_addr_default(const struct rte_mbuf *mb)
{
	return rte_mbuf_data_iova_default(mb);
}

/**
 * Return the mbuf owning the data buffer address of an indirect mbuf.
 *
 * @param mi
 *   The pointer to the indirect mbuf.
 * @return
 *   The address of the direct mbuf corresponding to buffer_addr.
 */
static inline struct rte_mbuf *
rte_mbuf_from_indirect(struct rte_mbuf *mi)
{
	return (struct rte_mbuf *)RTE_PTR_SUB(mi->buf_addr, sizeof(*mi) + mi->priv_size);
}

/**
 * Return address of buffer embedded in the given mbuf.
 *
 * The return value shall be same as mb->buf_addr if the mbuf is already
 * initialized and direct. However, this API is useful if mempool of the
 * mbuf is already known because it doesn't need to access mbuf contents in
 * order to get the mempool pointer.
 *
 * @warning
 * @b EXPERIMENTAL: This API may change without prior notice.
 * This will be used by rte_mbuf_to_baddr() which has redundant code once
 * experimental tag is removed.
 *
 * @param mb
 *   The pointer to the mbuf.
 * @param mp
 *   The pointer to the mempool of the mbuf.
 * @return
 *   The pointer of the mbuf buffer.
 */
__rte_experimental
static inline char *
rte_mbuf_buf_addr(struct rte_mbuf *mb, struct rte_mempool *mp)
{
	return (char *)mb + sizeof(*mb) + rte_pktmbuf_priv_size(mp);
}

/**
 * Return the default address of the beginning of the mbuf data.
 *
 * @warning
 * @b EXPERIMENTAL: This API may change without prior notice.
 *
 * @param mb
 *   The pointer to the mbuf.
 * @return
 *   The pointer of the beginning of the mbuf data.
 */
__rte_experimental
static inline char *
rte_mbuf_data_addr_default(__rte_unused struct rte_mbuf *mb)
{
	/* gcc complains about calling this experimental function even
	 * when not using it. Hide it with ALLOW_EXPERIMENTAL_API.
	 */
#ifdef ALLOW_EXPERIMENTAL_API
	return rte_mbuf_buf_addr(mb, mb->pool) + RTE_PKTMBUF_HEADROOM;
#else
	return NULL;
#endif
}

/**
 * Return address of buffer embedded in the given mbuf.
 *
 * @note: Accessing mempool pointer of a mbuf is expensive because the
 * pointer is stored in the 2nd cache line of mbuf. If mempool is known, it
 * is better not to reference the mempool pointer in mbuf but calling
 * rte_mbuf_buf_addr() would be more efficient.
 *
 * @param md
 *   The pointer to the mbuf.
 * @return
 *   The address of the data buffer owned by the mbuf.
 */
static inline char *
rte_mbuf_to_baddr(struct rte_mbuf *md)
{
#ifdef ALLOW_EXPERIMENTAL_API
	return rte_mbuf_buf_addr(md, md->pool);
#else
	char *buffer_addr;
	buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool);
	return buffer_addr;
#endif
}

/**
 * Return the starting address of the private data area embedded in
 * the given mbuf.
 *
 * Note that no check is made to ensure that a private data area
 * actually exists in the supplied mbuf.
 *
 * @param m
 *   The pointer to the mbuf.
 * @return
 *   The starting address of the private data area of the given mbuf.
 */
__rte_experimental
static inline void *
rte_mbuf_to_priv(struct rte_mbuf *m)
{
	return RTE_PTR_ADD(m, sizeof(struct rte_mbuf));
}

/**
 * Private data in case of pktmbuf pool.
 *
 * A structure that contains some pktmbuf_pool-specific data that are
 * appended after the mempool structure (in private data).
 */
struct rte_pktmbuf_pool_private {
	uint16_t mbuf_data_room_size; /**< Size of data space in each mbuf. */
	uint16_t mbuf_priv_size;      /**< Size of private area in each mbuf. */
	uint32_t flags; /**< reserved for future use. */
};

/**
 * Return the flags from private data in an mempool structure.
 *
 * @param mp
 *   A pointer to the mempool structure.
 * @return
 *   The flags from the private data structure.
 */
static inline uint32_t
rte_pktmbuf_priv_flags(struct rte_mempool *mp)
{
	struct rte_pktmbuf_pool_private *mbp_priv;

	mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
	return mbp_priv->flags;
}

/**
 * When set, pktmbuf mempool will hold only mbufs with pinned external
 * buffer. The external buffer will be attached to the mbuf at the
 * memory pool creation and will never be detached by the mbuf free calls.
 * mbuf should not contain any room for data after the mbuf structure.
 */
#define RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF (1 << 0)

/**
 * Returns non zero if given mbuf has a pinned external buffer, or zero
 * otherwise. The pinned external buffer is allocated at pool creation
 * time and should not be freed on mbuf freeing.
 *
 * External buffer is a user-provided anonymous buffer.
 */
#define RTE_MBUF_HAS_PINNED_EXTBUF(mb) \
	(rte_pktmbuf_priv_flags(mb->pool) & RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF)

#ifdef RTE_LIBRTE_MBUF_DEBUG

/**  check mbuf type in debug mode */
#define __rte_mbuf_sanity_check(m, is_h) rte_mbuf_sanity_check(m, is_h)

#else /*  RTE_LIBRTE_MBUF_DEBUG */

/**  check mbuf type in debug mode */
#define __rte_mbuf_sanity_check(m, is_h) do { } while (0)

#endif /*  RTE_LIBRTE_MBUF_DEBUG */

#ifdef RTE_MBUF_REFCNT_ATOMIC

/**
 * Reads the value of an mbuf's refcnt.
 * @param m
 *   Mbuf to read
 * @return
 *   Reference count number.
 */
static inline uint16_t
rte_mbuf_refcnt_read(const struct rte_mbuf *m)
{
	return __atomic_load_n(&m->refcnt, __ATOMIC_RELAXED);
}

/**
 * Sets an mbuf's refcnt to a defined value.
 * @param m
 *   Mbuf to update
 * @param new_value
 *   Value set
 */
static inline void
rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
{
	__atomic_store_n(&m->refcnt, new_value, __ATOMIC_RELAXED);
}

/* internal */
static inline uint16_t
__rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
{
	return __atomic_add_fetch(&m->refcnt, (uint16_t)value,
				 __ATOMIC_ACQ_REL);
}

/**
 * Adds given value to an mbuf's refcnt and returns its new value.
 * @param m
 *   Mbuf to update
 * @param value
 *   Value to add/subtract
 * @return
 *   Updated value
 */
static inline uint16_t
rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
{
	/*
	 * The atomic_add is an expensive operation, so we don't want to
	 * call it in the case where we know we are the unique holder of
	 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
	 * operation has to be used because concurrent accesses on the
	 * reference counter can occur.
	 */
	if (likely(rte_mbuf_refcnt_read(m) == 1)) {
		++value;
		rte_mbuf_refcnt_set(m, (uint16_t)value);
		return (uint16_t)value;
	}

	return __rte_mbuf_refcnt_update(m, value);
}

#else /* ! RTE_MBUF_REFCNT_ATOMIC */

/* internal */
static inline uint16_t
__rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
{
	m->refcnt = (uint16_t)(m->refcnt + value);
	return m->refcnt;
}

/**
 * Adds given value to an mbuf's refcnt and returns its new value.
 */
static inline uint16_t
rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
{
	return __rte_mbuf_refcnt_update(m, value);
}

/**
 * Reads the value of an mbuf's refcnt.
 */
static inline uint16_t
rte_mbuf_refcnt_read(const struct rte_mbuf *m)
{
	return m->refcnt;
}

/**
 * Sets an mbuf's refcnt to the defined value.
 */
static inline void
rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
{
	m->refcnt = new_value;
}

#endif /* RTE_MBUF_REFCNT_ATOMIC */

/**
 * Reads the refcnt of an external buffer.
 *
 * @param shinfo
 *   Shared data of the external buffer.
 * @return
 *   Reference count number.
 */
static inline uint16_t
rte_mbuf_ext_refcnt_read(const struct rte_mbuf_ext_shared_info *shinfo)
{
	return __atomic_load_n(&shinfo->refcnt, __ATOMIC_RELAXED);
}

/**
 * Set refcnt of an external buffer.
 *
 * @param shinfo
 *   Shared data of the external buffer.
 * @param new_value
 *   Value set
 */
static inline void
rte_mbuf_ext_refcnt_set(struct rte_mbuf_ext_shared_info *shinfo,
	uint16_t new_value)
{
	__atomic_store_n(&shinfo->refcnt, new_value, __ATOMIC_RELAXED);
}

/**
 * Add given value to refcnt of an external buffer and return its new
 * value.
 *
 * @param shinfo
 *   Shared data of the external buffer.
 * @param value
 *   Value to add/subtract
 * @return
 *   Updated value
 */
static inline uint16_t
rte_mbuf_ext_refcnt_update(struct rte_mbuf_ext_shared_info *shinfo,
	int16_t value)
{
	if (likely(rte_mbuf_ext_refcnt_read(shinfo) == 1)) {
		++value;
		rte_mbuf_ext_refcnt_set(shinfo, (uint16_t)value);
		return (uint16_t)value;
	}

	return __atomic_add_fetch(&shinfo->refcnt, (uint16_t)value,
				 __ATOMIC_ACQ_REL);
}

/** Mbuf prefetch */
#define RTE_MBUF_PREFETCH_TO_FREE(m) do {       \
	if ((m) != NULL)                        \
		rte_prefetch0(m);               \
} while (0)


/**
 * Sanity checks on an mbuf.
 *
 * Check the consistency of the given mbuf. The function will cause a
 * panic if corruption is detected.
 *
 * @param m
 *   The mbuf to be checked.
 * @param is_header
 *   True if the mbuf is a packet header, false if it is a sub-segment
 *   of a packet (in this case, some fields like nb_segs are not checked)
 */
void
rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header);

/**
 * Sanity checks on a mbuf.
 *
 * Almost like rte_mbuf_sanity_check(), but this function gives the reason
 * if corruption is detected rather than panic.
 *
 * @param m
 *   The mbuf to be checked.
 * @param is_header
 *   True if the mbuf is a packet header, false if it is a sub-segment
 *   of a packet (in this case, some fields like nb_segs are not checked)
 * @param reason
 *   A reference to a string pointer where to store the reason why a mbuf is
 *   considered invalid.
 * @return
 *   - 0 if no issue has been found, reason is left untouched.
 *   - -1 if a problem is detected, reason then points to a string describing
 *     the reason why the mbuf is deemed invalid.
 */
__rte_experimental
int rte_mbuf_check(const struct rte_mbuf *m, int is_header,
		   const char **reason);

#define MBUF_RAW_ALLOC_CHECK(m) do {				\
	RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);		\
	RTE_ASSERT((m)->next == NULL);				\
	RTE_ASSERT((m)->nb_segs == 1);				\
	__rte_mbuf_sanity_check(m, 0);				\
} while (0)

/**
 * Allocate an uninitialized mbuf from mempool *mp*.
 *
 * This function can be used by PMDs (especially in RX functions) to
 * allocate an uninitialized mbuf. The driver is responsible of
 * initializing all the required fields. See rte_pktmbuf_reset().
 * For standard needs, prefer rte_pktmbuf_alloc().
 *
 * The caller can expect that the following fields of the mbuf structure
 * are initialized: buf_addr, buf_iova, buf_len, refcnt=1, nb_segs=1,
 * next=NULL, pool, priv_size. The other fields must be initialized
 * by the caller.
 *
 * @param mp
 *   The mempool from which mbuf is allocated.
 * @return
 *   - The pointer to the new mbuf on success.
 *   - NULL if allocation failed.
 */
static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
{
	struct rte_mbuf *m;

	if (rte_mempool_get(mp, (void **)&m) < 0)
		return NULL;
	MBUF_RAW_ALLOC_CHECK(m);
	return m;
}

/**
 * Put mbuf back into its original mempool.
 *
 * The caller must ensure that the mbuf is direct and properly
 * reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by
 * rte_pktmbuf_prefree_seg().
 *
 * This function should be used with care, when optimization is
 * required. For standard needs, prefer rte_pktmbuf_free() or
 * rte_pktmbuf_free_seg().
 *
 * @param m
 *   The mbuf to be freed.
 */
static __rte_always_inline void
rte_mbuf_raw_free(struct rte_mbuf *m)
{
	RTE_ASSERT(!RTE_MBUF_CLONED(m) &&
		  (!RTE_MBUF_HAS_EXTBUF(m) || RTE_MBUF_HAS_PINNED_EXTBUF(m)));
	RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
	RTE_ASSERT(m->next == NULL);
	RTE_ASSERT(m->nb_segs == 1);
	__rte_mbuf_sanity_check(m, 0);
	rte_mempool_put(m->pool, m);
}

/**
 * The packet mbuf constructor.
 *
 * This function initializes some fields in the mbuf structure that are
 * not modified by the user once created (origin pool, buffer start
 * address, and so on). This function is given as a callback function to
 * rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.
 *
 * @param mp
 *   The mempool from which mbufs originate.
 * @param opaque_arg
 *   A pointer that can be used by the user to retrieve useful information
 *   for mbuf initialization. This pointer is the opaque argument passed to
 *   rte_mempool_obj_iter() or rte_mempool_create().
 * @param m
 *   The mbuf to initialize.
 * @param i
 *   The index of the mbuf in the pool table.
 */
void rte_pktmbuf_init(struct rte_mempool *mp, void *opaque_arg,
		      void *m, unsigned i);

/**
 * A  packet mbuf pool constructor.
 *
 * This function initializes the mempool private data in the case of a
 * pktmbuf pool. This private data is needed by the driver. The
 * function must be called on the mempool before it is used, or it
 * can be given as a callback function to rte_mempool_create() at
 * pool creation. It can be extended by the user, for example, to
 * provide another packet size.
 *
 * @param mp
 *   The mempool from which mbufs originate.
 * @param opaque_arg
 *   A pointer that can be used by the user to retrieve useful information
 *   for mbuf initialization. This pointer is the opaque argument passed to
 *   rte_mempool_create().
 */
void rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg);

/**
 * Create a mbuf pool.
 *
 * This function creates and initializes a packet mbuf pool. It is
 * a wrapper to rte_mempool functions.
 *
 * @param name
 *   The name of the mbuf pool.
 * @param n
 *   The number of elements in the mbuf pool. 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 cache_size
 *   Size of the per-core object cache. See rte_mempool_create() for
 *   details.
 * @param priv_size
 *   Size of application private are between the rte_mbuf structure
 *   and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
 * @param data_room_size
 *   Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
 * @param socket_id
 *   The socket identifier where the memory should be allocated. The
 *   value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
 *   reserved zone.
 * @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, or priv_size is not aligned.
 *    - 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_pktmbuf_pool_create(const char *name, unsigned n,
	unsigned cache_size, uint16_t priv_size, uint16_t data_room_size,
	int socket_id);

/**
 * Create a mbuf pool with a given mempool ops name
 *
 * This function creates and initializes a packet mbuf pool. It is
 * a wrapper to rte_mempool functions.
 *
 * @param name
 *   The name of the mbuf pool.
 * @param n
 *   The number of elements in the mbuf pool. 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 cache_size
 *   Size of the per-core object cache. See rte_mempool_create() for
 *   details.
 * @param priv_size
 *   Size of application private are between the rte_mbuf structure
 *   and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
 * @param data_room_size
 *   Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
 * @param socket_id
 *   The socket identifier where the memory should be allocated. The
 *   value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
 *   reserved zone.
 * @param ops_name
 *   The mempool ops name to be used for this mempool instead of
 *   default mempool. The value can be *NULL* to use default mempool.
 * @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, or priv_size is not aligned.
 *    - 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_pktmbuf_pool_create_by_ops(const char *name, unsigned int n,
	unsigned int cache_size, uint16_t priv_size, uint16_t data_room_size,
	int socket_id, const char *ops_name);

/** A structure that describes the pinned external buffer segment. */
struct rte_pktmbuf_extmem {
	void *buf_ptr;		/**< The virtual address of data buffer. */
	rte_iova_t buf_iova;	/**< The IO address of the data buffer. */
	size_t buf_len;		/**< External buffer length in bytes. */
	uint16_t elt_size;	/**< mbuf element size in bytes. */
};

/**
 * Create a mbuf pool with external pinned data buffers.
 *
 * This function creates and initializes a packet mbuf pool that contains
 * only mbufs with external buffer. It is a wrapper to rte_mempool functions.
 *
 * @param name
 *   The name of the mbuf pool.
 * @param n
 *   The number of elements in the mbuf pool. 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 cache_size
 *   Size of the per-core object cache. See rte_mempool_create() for
 *   details.
 * @param priv_size
 *   Size of application private are between the rte_mbuf structure
 *   and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
 * @param data_room_size
 *   Size of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
 * @param socket_id
 *   The socket identifier where the memory should be allocated. The
 *   value can be *SOCKET_ID_ANY* if there is no NUMA constraint for the
 *   reserved zone.
 * @param ext_mem
 *   Pointer to the array of structures describing the external memory
 *   for data buffers. It is caller responsibility to register this memory
 *   with rte_extmem_register() (if needed), map this memory to appropriate
 *   physical device, etc.
 * @param ext_num
 *   Number of elements in the ext_mem array.
 * @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, or priv_size is not aligned.
 *    - 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
 */
__rte_experimental
struct rte_mempool *
rte_pktmbuf_pool_create_extbuf(const char *name, unsigned int n,
	unsigned int cache_size, uint16_t priv_size,
	uint16_t data_room_size, int socket_id,
	const struct rte_pktmbuf_extmem *ext_mem,
	unsigned int ext_num);

/**
 * Get the data room size of mbufs stored in a pktmbuf_pool
 *
 * The data room size is the amount of data that can be stored in a
 * mbuf including the headroom (RTE_PKTMBUF_HEADROOM).
 *
 * @param mp
 *   The packet mbuf pool.
 * @return
 *   The data room size of mbufs stored in this mempool.
 */
static inline uint16_t
rte_pktmbuf_data_room_size(struct rte_mempool *mp)
{
	struct rte_pktmbuf_pool_private *mbp_priv;

	mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
	return mbp_priv->mbuf_data_room_size;
}

/**
 * Get the application private size of mbufs stored in a pktmbuf_pool
 *
 * The private size of mbuf is a zone located between the rte_mbuf
 * structure and the data buffer where an application can store data
 * associated to a packet.
 *
 * @param mp
 *   The packet mbuf pool.
 * @return
 *   The private size of mbufs stored in this mempool.
 */
static inline uint16_t
rte_pktmbuf_priv_size(struct rte_mempool *mp)
{
	struct rte_pktmbuf_pool_private *mbp_priv;

	mbp_priv = (struct rte_pktmbuf_pool_private *)rte_mempool_get_priv(mp);
	return mbp_priv->mbuf_priv_size;
}

/**
 * Reset the data_off field of a packet mbuf to its default value.
 *
 * The given mbuf must have only one segment, which should be empty.
 *
 * @param m
 *   The packet mbuf's data_off field has to be reset.
 */
static inline void rte_pktmbuf_reset_headroom(struct rte_mbuf *m)
{
	m->data_off = (uint16_t)RTE_MIN((uint16_t)RTE_PKTMBUF_HEADROOM,
					(uint16_t)m->buf_len);
}

/**
 * Reset the fields of a packet mbuf to their default values.
 *
 * The given mbuf must have only one segment.
 *
 * @param m
 *   The packet mbuf to be reset.
 */
#define MBUF_INVALID_PORT UINT16_MAX

static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
{
	m->next = NULL;
	m->pkt_len = 0;
	m->tx_offload = 0;
	m->vlan_tci = 0;
	m->vlan_tci_outer = 0;
	m->nb_segs = 1;
	m->port = MBUF_INVALID_PORT;

	m->ol_flags &= EXT_ATTACHED_MBUF;
	m->packet_type = 0;
	rte_pktmbuf_reset_headroom(m);

	m->data_len = 0;
	__rte_mbuf_sanity_check(m, 1);
}

/**
 * Allocate a new mbuf from a mempool.
 *
 * This new mbuf contains one segment, which has a length of 0. The pointer
 * to data is initialized to have some bytes of headroom in the buffer
 * (if buffer size allows).
 *
 * @param mp
 *   The mempool from which the mbuf is allocated.
 * @return
 *   - The pointer to the new mbuf on success.
 *   - NULL if allocation failed.
 */
static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp)
{
	struct rte_mbuf *m;
	if ((m = rte_mbuf_raw_alloc(mp)) != NULL)
		rte_pktmbuf_reset(m);
	return m;
}

/**
 * Allocate a bulk of mbufs, initialize refcnt and reset the fields to default
 * values.
 *
 *  @param pool
 *    The mempool from which mbufs are allocated.
 *  @param mbufs
 *    Array of pointers to mbufs
 *  @param count
 *    Array size
 *  @return
 *   - 0: Success
 *   - -ENOENT: Not enough entries in the mempool; no mbufs are retrieved.
 */
static inline int rte_pktmbuf_alloc_bulk(struct rte_mempool *pool,
	 struct rte_mbuf **mbufs, unsigned count)
{
	unsigned idx = 0;
	int rc;

	rc = rte_mempool_get_bulk(pool, (void **)mbufs, count);
	if (unlikely(rc))
		return rc;

	/* To understand duff's device on loop unwinding optimization, see
	 * https://en.wikipedia.org/wiki/Duff's_device.
	 * Here while() loop is used rather than do() while{} to avoid extra
	 * check if count is zero.
	 */
	switch (count % 4) {
	case 0:
		while (idx != count) {
			MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
			rte_pktmbuf_reset(mbufs[idx]);
			idx++;
			/* fall-through */
	case 3:
			MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
			rte_pktmbuf_reset(mbufs[idx]);
			idx++;
			/* fall-through */
	case 2:
			MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
			rte_pktmbuf_reset(mbufs[idx]);
			idx++;
			/* fall-through */
	case 1:
			MBUF_RAW_ALLOC_CHECK(mbufs[idx]);
			rte_pktmbuf_reset(mbufs[idx]);
			idx++;
			/* fall-through */
		}
	}
	return 0;
}

/**
 * Initialize shared data at the end of an external buffer before attaching
 * to a mbuf by ``rte_pktmbuf_attach_extbuf()``. This is not a mandatory
 * initialization but a helper function to simply spare a few bytes at the
 * end of the buffer for shared data. If shared data is allocated
 * separately, this should not be called but application has to properly
 * initialize the shared data according to its need.
 *
 * Free callback and its argument is saved and the refcnt is set to 1.
 *
 * @warning
 * The value of buf_len will be reduced to RTE_PTR_DIFF(shinfo, buf_addr)
 * after this initialization. This shall be used for
 * ``rte_pktmbuf_attach_extbuf()``
 *
 * @param buf_addr
 *   The pointer to the external buffer.
 * @param [in,out] buf_len
 *   The pointer to length of the external buffer. Input value must be
 *   larger than the size of ``struct rte_mbuf_ext_shared_info`` and
 *   padding for alignment. If not enough, this function will return NULL.
 *   Adjusted buffer length will be returned through this pointer.
 * @param free_cb
 *   Free callback function to call when the external buffer needs to be
 *   freed.
 * @param fcb_opaque
 *   Argument for the free callback function.
 *
 * @return
 *   A pointer to the initialized shared data on success, return NULL
 *   otherwise.
 */
static inline struct rte_mbuf_ext_shared_info *
rte_pktmbuf_ext_shinfo_init_helper(void *buf_addr, uint16_t *buf_len,
	rte_mbuf_extbuf_free_callback_t free_cb, void *fcb_opaque)
{
	struct rte_mbuf_ext_shared_info *shinfo;
	void *buf_end = RTE_PTR_ADD(buf_addr, *buf_len);
	void *addr;

	addr = RTE_PTR_ALIGN_FLOOR(RTE_PTR_SUB(buf_end, sizeof(*shinfo)),
				   sizeof(uintptr_t));
	if (addr <= buf_addr)
		return NULL;

	shinfo = (struct rte_mbuf_ext_shared_info *)addr;
	shinfo->free_cb = free_cb;
	shinfo->fcb_opaque = fcb_opaque;
	rte_mbuf_ext_refcnt_set(shinfo, 1);

	*buf_len = (uint16_t)RTE_PTR_DIFF(shinfo, buf_addr);
	return shinfo;
}

/**
 * Attach an external buffer to a mbuf.
 *
 * User-managed anonymous buffer can be attached to an mbuf. When attaching
 * it, corresponding free callback function and its argument should be
 * provided via shinfo. This callback function will be called once all the
 * mbufs are detached from the buffer (refcnt becomes zero).
 *
 * The headroom length of the attaching mbuf will be set to zero and this
 * can be properly adjusted after attachment. For example, ``rte_pktmbuf_adj()``
 * or ``rte_pktmbuf_reset_headroom()`` might be used.
 *
 * Similarly, the packet length is initialized to 0. If the buffer contains
 * data, the user has to adjust ``data_len`` and the ``pkt_len`` field of
 * the mbuf accordingly.
 *
 * More mbufs can be attached to the same external buffer by
 * ``rte_pktmbuf_attach()`` once the external buffer has been attached by
 * this API.
 *
 * Detachment can be done by either ``rte_pktmbuf_detach_extbuf()`` or
 * ``rte_pktmbuf_detach()``.
 *
 * Memory for shared data must be provided and user must initialize all of
 * the content properly, especially free callback and refcnt. The pointer
 * of shared data will be stored in m->shinfo.
 * ``rte_pktmbuf_ext_shinfo_init_helper`` can help to simply spare a few
 * bytes at the end of buffer for the shared data, store free callback and
 * its argument and set the refcnt to 1. The following is an example:
 *
 *   struct rte_mbuf_ext_shared_info *shinfo =
 *          rte_pktmbuf_ext_shinfo_init_helper(buf_addr, &buf_len,
 *                                             free_cb, fcb_arg);
 *   rte_pktmbuf_attach_extbuf(m, buf_addr, buf_iova, buf_len, shinfo);
 *   rte_pktmbuf_reset_headroom(m);
 *   rte_pktmbuf_adj(m, data_len);
 *
 * Attaching an external buffer is quite similar to mbuf indirection in
 * replacing buffer addresses and length of a mbuf, but a few differences:
 * - When an indirect mbuf is attached, refcnt of the direct mbuf would be
 *   2 as long as the direct mbuf itself isn't freed after the attachment.
 *   In such cases, the buffer area of a direct mbuf must be read-only. But
 *   external buffer has its own refcnt and it starts from 1. Unless
 *   multiple mbufs are attached to a mbuf having an external buffer, the
 *   external buffer is writable.
 * - There's no need to allocate buffer from a mempool. Any buffer can be
 *   attached with appropriate free callback and its IO address.
 * - Smaller metadata is required to maintain shared data such as refcnt.
 *
 * @param m
 *   The pointer to the mbuf.
 * @param buf_addr
 *   The pointer to the external buffer.
 * @param buf_iova
 *   IO address of the external buffer.
 * @param buf_len
 *   The size of the external buffer.
 * @param shinfo
 *   User-provided memory for shared data of the external buffer.
 */
static inline void
rte_pktmbuf_attach_extbuf(struct rte_mbuf *m, void *buf_addr,
	rte_iova_t buf_iova, uint16_t buf_len,
	struct rte_mbuf_ext_shared_info *shinfo)
{
	/* mbuf should not be read-only */
	RTE_ASSERT(RTE_MBUF_DIRECT(m) && rte_mbuf_refcnt_read(m) == 1);
	RTE_ASSERT(shinfo->free_cb != NULL);

	m->buf_addr = buf_addr;
	m->buf_iova = buf_iova;
	m->buf_len = buf_len;

	m->data_len = 0;
	m->data_off = 0;

	m->ol_flags |= EXT_ATTACHED_MBUF;
	m->shinfo = shinfo;
}

/**
 * Detach the external buffer attached to a mbuf, same as
 * ``rte_pktmbuf_detach()``
 *
 * @param m
 *   The mbuf having external buffer.
 */
#define rte_pktmbuf_detach_extbuf(m) rte_pktmbuf_detach(m)

/**
 * Copy dynamic fields from msrc to mdst.
 *
 * @param mdst
 *   The destination mbuf.
 * @param msrc
 *   The source mbuf.
 */
static inline void
rte_mbuf_dynfield_copy(struct rte_mbuf *mdst, const struct rte_mbuf *msrc)
{
	memcpy(&mdst->dynfield1, msrc->dynfield1, sizeof(mdst->dynfield1));
}

/* internal */
static inline void
__rte_pktmbuf_copy_hdr(struct rte_mbuf *mdst, const struct rte_mbuf *msrc)
{
	mdst->port = msrc->port;
	mdst->vlan_tci = msrc->vlan_tci;
	mdst->vlan_tci_outer = msrc->vlan_tci_outer;
	mdst->tx_offload = msrc->tx_offload;
	mdst->hash = msrc->hash;
	mdst->packet_type = msrc->packet_type;
	mdst->timestamp = msrc->timestamp;
	rte_mbuf_dynfield_copy(mdst, msrc);
}

/**
 * Attach packet mbuf to another packet mbuf.
 *
 * If the mbuf we are attaching to isn't a direct buffer and is attached to
 * an external buffer, the mbuf being attached will be attached to the
 * external buffer instead of mbuf indirection.
 *
 * Otherwise, the mbuf will be indirectly attached. After attachment we
 * refer the mbuf we attached as 'indirect', while mbuf we attached to as
 * 'direct'.  The direct mbuf's reference counter is incremented.
 *
 * Right now, not supported:
 *  - attachment for already indirect mbuf (e.g. - mi has to be direct).
 *  - mbuf we trying to attach (mi) is used by someone else
 *    e.g. it's reference counter is greater then 1.
 *
 * @param mi
 *   The indirect packet mbuf.
 * @param m
 *   The packet mbuf we're attaching to.
 */
static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m)
{
	RTE_ASSERT(RTE_MBUF_DIRECT(mi) &&
	    rte_mbuf_refcnt_read(mi) == 1);

	if (RTE_MBUF_HAS_EXTBUF(m)) {
		rte_mbuf_ext_refcnt_update(m->shinfo, 1);
		mi->ol_flags = m->ol_flags;
		mi->shinfo = m->shinfo;
	} else {
		/* if m is not direct, get the mbuf that embeds the data */
		rte_mbuf_refcnt_update(rte_mbuf_from_indirect(m), 1);
		mi->priv_size = m->priv_size;
		mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
	}

	__rte_pktmbuf_copy_hdr(mi, m);

	mi->data_off = m->data_off;
	mi->data_len = m->data_len;
	mi->buf_iova = m->buf_iova;
	mi->buf_addr = m->buf_addr;
	mi->buf_len = m->buf_len;

	mi->next = NULL;
	mi->pkt_len = mi->data_len;
	mi->nb_segs = 1;

	__rte_mbuf_sanity_check(mi, 1);
	__rte_mbuf_sanity_check(m, 0);
}

/**
 * @internal used by rte_pktmbuf_detach().
 *
 * Decrement the reference counter of the external buffer. When the
 * reference counter becomes 0, the buffer is freed by pre-registered
 * callback.
 */
static inline void
__rte_pktmbuf_free_extbuf(struct rte_mbuf *m)
{
	RTE_ASSERT(RTE_MBUF_HAS_EXTBUF(m));
	RTE_ASSERT(m->shinfo != NULL);

	if (rte_mbuf_ext_refcnt_update(m->shinfo, -1) == 0)
		m->shinfo->free_cb(m->buf_addr, m->shinfo->fcb_opaque);
}

/**
 * @internal used by rte_pktmbuf_detach().
 *
 * Decrement the direct mbuf's reference counter. When the reference
 * counter becomes 0, the direct mbuf is freed.
 */
static inline void
__rte_pktmbuf_free_direct(struct rte_mbuf *m)
{
	struct rte_mbuf *md;

	RTE_ASSERT(RTE_MBUF_CLONED(m));

	md = rte_mbuf_from_indirect(m);

	if (rte_mbuf_refcnt_update(md, -1) == 0) {
		md->next = NULL;
		md->nb_segs = 1;
		rte_mbuf_refcnt_set(md, 1);
		rte_mbuf_raw_free(md);
	}
}

/**
 * Detach a packet mbuf from external buffer or direct buffer.
 *
 *  - decrement refcnt and free the external/direct buffer if refcnt
 *    becomes zero.
 *  - restore original mbuf address and length values.
 *  - reset pktmbuf data and data_len to their default values.
 *
 * All other fields of the given packet mbuf will be left intact.
 *
 * If the packet mbuf was allocated from the pool with pinned
 * external buffers the rte_pktmbuf_detach does nothing with the
 * mbuf of this kind, because the pinned buffers are not supposed
 * to be detached.
 *
 * @param m
 *   The indirect attached packet mbuf.
 */
static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
{
	struct rte_mempool *mp = m->pool;
	uint32_t mbuf_size, buf_len;
	uint16_t priv_size;

	if (RTE_MBUF_HAS_EXTBUF(m)) {
		/*
		 * The mbuf has the external attached buffer,
		 * we should check the type of the memory pool where
		 * the mbuf was allocated from to detect the pinned
		 * external buffer.
		 */
		uint32_t flags = rte_pktmbuf_priv_flags(mp);

		if (flags & RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF) {
			/*
			 * The pinned external buffer should not be
			 * detached from its backing mbuf, just exit.
			 */
			return;
		}
		__rte_pktmbuf_free_extbuf(m);
	} else {
		__rte_pktmbuf_free_direct(m);
	}
	priv_size = rte_pktmbuf_priv_size(mp);
	mbuf_size = (uint32_t)(sizeof(struct rte_mbuf) + priv_size);
	buf_len = rte_pktmbuf_data_room_size(mp);

	m->priv_size = priv_size;
	m->buf_addr = (char *)m + mbuf_size;
	m->buf_iova = rte_mempool_virt2iova(m) + mbuf_size;
	m->buf_len = (uint16_t)buf_len;
	rte_pktmbuf_reset_headroom(m);
	m->data_len = 0;
	m->ol_flags = 0;
}

/**
 * @internal Handle the packet mbufs with attached pinned external buffer
 * on the mbuf freeing:
 *
 *  - return zero if reference counter in shinfo is one. It means there is
 *  no more reference to this pinned buffer and mbuf can be returned to
 *  the pool
 *
 *  - otherwise (if reference counter is not one), decrement reference
 *  counter and return non-zero value to prevent freeing the backing mbuf.
 *
 * Returns non zero if mbuf should not be freed.
 */
static inline int __rte_pktmbuf_pinned_extbuf_decref(struct rte_mbuf *m)
{
	struct rte_mbuf_ext_shared_info *shinfo;

	/* Clear flags, mbuf is being freed. */
	m->ol_flags = EXT_ATTACHED_MBUF;
	shinfo = m->shinfo;

	/* Optimize for performance - do not dec/reinit */
	if (likely(rte_mbuf_ext_refcnt_read(shinfo) == 1))
		return 0;

	/*
	 * Direct usage of add primitive to avoid
	 * duplication of comparing with one.
	 */
	if (likely(__atomic_add_fetch(&shinfo->refcnt, (uint16_t)-1,
				     __ATOMIC_ACQ_REL)))
		return 1;

	/* Reinitialize counter before mbuf freeing. */
	rte_mbuf_ext_refcnt_set(shinfo, 1);
	return 0;
}

/**
 * Decrease reference counter and unlink a mbuf segment
 *
 * This function does the same than a free, except that it does not
 * return the segment to its pool.
 * It decreases the reference counter, and if it reaches 0, it is
 * detached from its parent for an indirect mbuf.
 *
 * @param m
 *   The mbuf to be unlinked
 * @return
 *   - (m) if it is the last reference. It can be recycled or freed.
 *   - (NULL) if the mbuf still has remaining references on it.
 */
static __rte_always_inline struct rte_mbuf *
rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
{
	__rte_mbuf_sanity_check(m, 0);

	if (likely(rte_mbuf_refcnt_read(m) == 1)) {

		if (!RTE_MBUF_DIRECT(m)) {
			rte_pktmbuf_detach(m);
			if (RTE_MBUF_HAS_EXTBUF(m) &&
			    RTE_MBUF_HAS_PINNED_EXTBUF(m) &&
			    __rte_pktmbuf_pinned_extbuf_decref(m))
				return NULL;
		}

		if (m->next != NULL) {
			m->next = NULL;
			m->nb_segs = 1;
		}

		return m;

	} else if (__rte_mbuf_refcnt_update(m, -1) == 0) {

		if (!RTE_MBUF_DIRECT(m)) {
			rte_pktmbuf_detach(m);
			if (RTE_MBUF_HAS_EXTBUF(m) &&
			    RTE_MBUF_HAS_PINNED_EXTBUF(m) &&
			    __rte_pktmbuf_pinned_extbuf_decref(m))
				return NULL;
		}

		if (m->next != NULL) {
			m->next = NULL;
			m->nb_segs = 1;
		}
		rte_mbuf_refcnt_set(m, 1);

		return m;
	}
	return NULL;
}

/**
 * Free a segment of a packet mbuf into its original mempool.
 *
 * Free an mbuf, without parsing other segments in case of chained
 * buffers.
 *
 * @param m
 *   The packet mbuf segment to be freed.
 */
static __rte_always_inline void
rte_pktmbuf_free_seg(struct rte_mbuf *m)
{
	m = rte_pktmbuf_prefree_seg(m);
	if (likely(m != NULL))
		rte_mbuf_raw_free(m);
}

/**
 * Free a packet mbuf back into its original mempool.
 *
 * Free an mbuf, and all its segments in case of chained buffers. Each
 * segment is added back into its original mempool.
 *
 * @param m
 *   The packet mbuf to be freed. If NULL, the function does nothing.
 */
static inline void rte_pktmbuf_free(struct rte_mbuf *m)
{
	struct rte_mbuf *m_next;

	if (m != NULL)
		__rte_mbuf_sanity_check(m, 1);

	while (m != NULL) {
		m_next = m->next;
		rte_pktmbuf_free_seg(m);
		m = m_next;
	}
}

/**
 * Free a bulk of packet mbufs back into their original mempools.
 *
 * Free a bulk of mbufs, and all their segments in case of chained buffers.
 * Each segment is added back into its original mempool.
 *
 *  @param mbufs
 *    Array of pointers to packet mbufs.
 *    The array may contain NULL pointers.
 *  @param count
 *    Array size.
 */
__rte_experimental
void rte_pktmbuf_free_bulk(struct rte_mbuf **mbufs, unsigned int count);

/**
 * Create a "clone" of the given packet mbuf.
 *
 * Walks through all segments of the given packet mbuf, and for each of them:
 *  - Creates a new packet mbuf from the given pool.
 *  - Attaches newly created mbuf to the segment.
 * Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values
 * from the original packet mbuf.
 *
 * @param md
 *   The packet mbuf to be cloned.
 * @param mp
 *   The mempool from which the "clone" mbufs are allocated.
 * @return
 *   - The pointer to the new "clone" mbuf on success.
 *   - NULL if allocation fails.
 */
struct rte_mbuf *
rte_pktmbuf_clone(struct rte_mbuf *md, struct rte_mempool *mp);

/**
 * Create a full copy of a given packet mbuf.
 *
 * Copies all the data from a given packet mbuf to a newly allocated
 * set of mbufs. The private data are is not copied.
 *
 * @param m
 *   The packet mbuf to be copiedd.
 * @param mp
 *   The mempool from which the "clone" mbufs are allocated.
 * @param offset
 *   The number of bytes to skip before copying.
 *   If the mbuf does not have that many bytes, it is an error
 *   and NULL is returned.
 * @param length
 *   The upper limit on bytes to copy.  Passing UINT32_MAX
 *   means all data (after offset).
 * @return
 *   - The pointer to the new "clone" mbuf on success.
 *   - NULL if allocation fails.
 */
__rte_experimental
struct rte_mbuf *
rte_pktmbuf_copy(const struct rte_mbuf *m, struct rte_mempool *mp,
		 uint32_t offset, uint32_t length);

/**
 * Adds given value to the refcnt of all packet mbuf segments.
 *
 * Walks through all segments of given packet mbuf and for each of them
 * invokes rte_mbuf_refcnt_update().
 *
 * @param m
 *   The packet mbuf whose refcnt to be updated.
 * @param v
 *   The value to add to the mbuf's segments refcnt.
 */
static inline void rte_pktmbuf_refcnt_update(struct rte_mbuf *m, int16_t v)
{
	__rte_mbuf_sanity_check(m, 1);

	do {
		rte_mbuf_refcnt_update(m, v);
	} while ((m = m->next) != NULL);
}

/**
 * Get the headroom in a packet mbuf.
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   The length of the headroom.
 */
static inline uint16_t rte_pktmbuf_headroom(const struct rte_mbuf *m)
{
	__rte_mbuf_sanity_check(m, 0);
	return m->data_off;
}

/**
 * Get the tailroom of a packet mbuf.
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   The length of the tailroom.
 */
static inline uint16_t rte_pktmbuf_tailroom(const struct rte_mbuf *m)
{
	__rte_mbuf_sanity_check(m, 0);
	return (uint16_t)(m->buf_len - rte_pktmbuf_headroom(m) -
			  m->data_len);
}

/**
 * Get the last segment of the packet.
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   The last segment of the given mbuf.
 */
static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
{
	__rte_mbuf_sanity_check(m, 1);
	while (m->next != NULL)
		m = m->next;
	return m;
}

/* deprecated */
#define rte_pktmbuf_mtophys_offset(m, o) \
	rte_pktmbuf_iova_offset(m, o)

/* deprecated */
#define rte_pktmbuf_mtophys(m) rte_pktmbuf_iova(m)

/**
 * A macro that returns the length of the packet.
 *
 * The value can be read or assigned.
 *
 * @param m
 *   The packet mbuf.
 */
#define rte_pktmbuf_pkt_len(m) ((m)->pkt_len)

/**
 * A macro that returns the length of the segment.
 *
 * The value can be read or assigned.
 *
 * @param m
 *   The packet mbuf.
 */
#define rte_pktmbuf_data_len(m) ((m)->data_len)

/**
 * Prepend len bytes to an mbuf data area.
 *
 * Returns a pointer to the new
 * data start address. If there is not enough headroom in the first
 * segment, the function will return NULL, without modifying the mbuf.
 *
 * @param m
 *   The pkt mbuf.
 * @param len
 *   The amount of data to prepend (in bytes).
 * @return
 *   A pointer to the start of the newly prepended data, or
 *   NULL if there is not enough headroom space in the first segment
 */
static inline char *rte_pktmbuf_prepend(struct rte_mbuf *m,
					uint16_t len)
{
	__rte_mbuf_sanity_check(m, 1);

	if (unlikely(len > rte_pktmbuf_headroom(m)))
		return NULL;

	/* NB: elaborating the subtraction like this instead of using
	 *     -= allows us to ensure the result type is uint16_t
	 *     avoiding compiler warnings on gcc 8.1 at least */
	m->data_off = (uint16_t)(m->data_off - len);
	m->data_len = (uint16_t)(m->data_len + len);
	m->pkt_len  = (m->pkt_len + len);

	return (char *)m->buf_addr + m->data_off;
}

/**
 * Append len bytes to an mbuf.
 *
 * Append len bytes to an mbuf and return a pointer to the start address
 * of the added data. If there is not enough tailroom in the last
 * segment, the function will return NULL, without modifying the mbuf.
 *
 * @param m
 *   The packet mbuf.
 * @param len
 *   The amount of data to append (in bytes).
 * @return
 *   A pointer to the start of the newly appended data, or
 *   NULL if there is not enough tailroom space in the last segment
 */
static inline char *rte_pktmbuf_append(struct rte_mbuf *m, uint16_t len)
{
	void *tail;
	struct rte_mbuf *m_last;

	__rte_mbuf_sanity_check(m, 1);

	m_last = rte_pktmbuf_lastseg(m);
	if (unlikely(len > rte_pktmbuf_tailroom(m_last)))
		return NULL;

	tail = (char *)m_last->buf_addr + m_last->data_off + m_last->data_len;
	m_last->data_len = (uint16_t)(m_last->data_len + len);
	m->pkt_len  = (m->pkt_len + len);
	return (char*) tail;
}

/**
 * Remove len bytes at the beginning of an mbuf.
 *
 * Returns a pointer to the start address of the new data area. If the
 * length is greater than the length of the first segment, then the
 * function will fail and return NULL, without modifying the mbuf.
 *
 * @param m
 *   The packet mbuf.
 * @param len
 *   The amount of data to remove (in bytes).
 * @return
 *   A pointer to the new start of the data.
 */
static inline char *rte_pktmbuf_adj(struct rte_mbuf *m, uint16_t len)
{
	__rte_mbuf_sanity_check(m, 1);

	if (unlikely(len > m->data_len))
		return NULL;

	/* NB: elaborating the addition like this instead of using
	 *     += allows us to ensure the result type is uint16_t
	 *     avoiding compiler warnings on gcc 8.1 at least */
	m->data_len = (uint16_t)(m->data_len - len);
	m->data_off = (uint16_t)(m->data_off + len);
	m->pkt_len  = (m->pkt_len - len);
	return (char *)m->buf_addr + m->data_off;
}

/**
 * Remove len bytes of data at the end of the mbuf.
 *
 * If the length is greater than the length of the last segment, the
 * function will fail and return -1 without modifying the mbuf.
 *
 * @param m
 *   The packet mbuf.
 * @param len
 *   The amount of data to remove (in bytes).
 * @return
 *   - 0: On success.
 *   - -1: On error.
 */
static inline int rte_pktmbuf_trim(struct rte_mbuf *m, uint16_t len)
{
	struct rte_mbuf *m_last;

	__rte_mbuf_sanity_check(m, 1);

	m_last = rte_pktmbuf_lastseg(m);
	if (unlikely(len > m_last->data_len))
		return -1;

	m_last->data_len = (uint16_t)(m_last->data_len - len);
	m->pkt_len  = (m->pkt_len - len);
	return 0;
}

/**
 * Test if mbuf data is contiguous.
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   - 1, if all data is contiguous (one segment).
 *   - 0, if there is several segments.
 */
static inline int rte_pktmbuf_is_contiguous(const struct rte_mbuf *m)
{
	__rte_mbuf_sanity_check(m, 1);
	return m->nb_segs == 1;
}

/**
 * @internal used by rte_pktmbuf_read().
 */
const void *__rte_pktmbuf_read(const struct rte_mbuf *m, uint32_t off,
	uint32_t len, void *buf);

/**
 * Read len data bytes in a mbuf at specified offset.
 *
 * If the data is contiguous, return the pointer in the mbuf data, else
 * copy the data in the buffer provided by the user and return its
 * pointer.
 *
 * @param m
 *   The pointer to the mbuf.
 * @param off
 *   The offset of the data in the mbuf.
 * @param len
 *   The amount of bytes to read.
 * @param buf
 *   The buffer where data is copied if it is not contiguous in mbuf
 *   data. Its length should be at least equal to the len parameter.
 * @return
 *   The pointer to the data, either in the mbuf if it is contiguous,
 *   or in the user buffer. If mbuf is too small, NULL is returned.
 */
static inline const void *rte_pktmbuf_read(const struct rte_mbuf *m,
	uint32_t off, uint32_t len, void *buf)
{
	if (likely(off + len <= rte_pktmbuf_data_len(m)))
		return rte_pktmbuf_mtod_offset(m, char *, off);
	else
		return __rte_pktmbuf_read(m, off, len, buf);
}

/**
 * Chain an mbuf to another, thereby creating a segmented packet.
 *
 * Note: The implementation will do a linear walk over the segments to find
 * the tail entry. For cases when there are many segments, it's better to
 * chain the entries manually.
 *
 * @param head
 *   The head of the mbuf chain (the first packet)
 * @param tail
 *   The mbuf to put last in the chain
 *
 * @return
 *   - 0, on success.
 *   - -EOVERFLOW, if the chain segment limit exceeded
 */
static inline int rte_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *tail)
{
	struct rte_mbuf *cur_tail;

	/* Check for number-of-segments-overflow */
	if (head->nb_segs + tail->nb_segs > RTE_MBUF_MAX_NB_SEGS)
		return -EOVERFLOW;

	/* Chain 'tail' onto the old tail */
	cur_tail = rte_pktmbuf_lastseg(head);
	cur_tail->next = tail;

	/* accumulate number of segments and total length.
	 * NB: elaborating the addition like this instead of using
	 *     -= allows us to ensure the result type is uint16_t
	 *     avoiding compiler warnings on gcc 8.1 at least */
	head->nb_segs = (uint16_t)(head->nb_segs + tail->nb_segs);
	head->pkt_len += tail->pkt_len;

	/* pkt_len is only set in the head */
	tail->pkt_len = tail->data_len;

	return 0;
}

/*
 * @warning
 * @b EXPERIMENTAL: This API may change without prior notice.
 *
 * For given input values generate raw tx_offload value.
 * Note that it is caller responsibility to make sure that input parameters
 * don't exceed maximum bit-field values.
 * @param il2
 *   l2_len value.
 * @param il3
 *   l3_len value.
 * @param il4
 *   l4_len value.
 * @param tso
 *   tso_segsz value.
 * @param ol3
 *   outer_l3_len value.
 * @param ol2
 *   outer_l2_len value.
 * @param unused
 *   unused value.
 * @return
 *   raw tx_offload value.
 */
static __rte_always_inline uint64_t
rte_mbuf_tx_offload(uint64_t il2, uint64_t il3, uint64_t il4, uint64_t tso,
	uint64_t ol3, uint64_t ol2, uint64_t unused)
{
	return il2 << RTE_MBUF_L2_LEN_OFS |
		il3 << RTE_MBUF_L3_LEN_OFS |
		il4 << RTE_MBUF_L4_LEN_OFS |
		tso << RTE_MBUF_TSO_SEGSZ_OFS |
		ol3 << RTE_MBUF_OUTL3_LEN_OFS |
		ol2 << RTE_MBUF_OUTL2_LEN_OFS |
		unused << RTE_MBUF_TXOFLD_UNUSED_OFS;
}

/**
 * Validate general requirements for Tx offload in mbuf.
 *
 * This function checks correctness and completeness of Tx offload settings.
 *
 * @param m
 *   The packet mbuf to be validated.
 * @return
 *   0 if packet is valid
 */
static inline int
rte_validate_tx_offload(const struct rte_mbuf *m)
{
	uint64_t ol_flags = m->ol_flags;

	/* Does packet set any of available offloads? */
	if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
		return 0;

	/* IP checksum can be counted only for IPv4 packet */
	if ((ol_flags & PKT_TX_IP_CKSUM) && (ol_flags & PKT_TX_IPV6))
		return -EINVAL;

	/* IP type not set when required */
	if (ol_flags & (PKT_TX_L4_MASK | PKT_TX_TCP_SEG))
		if (!(ol_flags & (PKT_TX_IPV4 | PKT_TX_IPV6)))
			return -EINVAL;

	/* Check requirements for TSO packet */
	if (ol_flags & PKT_TX_TCP_SEG)
		if ((m->tso_segsz == 0) ||
				((ol_flags & PKT_TX_IPV4) &&
				!(ol_flags & PKT_TX_IP_CKSUM)))
			return -EINVAL;

	/* PKT_TX_OUTER_IP_CKSUM set for non outer IPv4 packet. */
	if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) &&
			!(ol_flags & PKT_TX_OUTER_IPV4))
		return -EINVAL;

	return 0;
}

/**
 * @internal used by rte_pktmbuf_linearize().
 */
int __rte_pktmbuf_linearize(struct rte_mbuf *mbuf);

/**
 * Linearize data in mbuf.
 *
 * This function moves the mbuf data in the first segment if there is enough
 * tailroom. The subsequent segments are unchained and freed.
 *
 * @param mbuf
 *   mbuf to linearize
 * @return
 *   - 0, on success
 *   - -1, on error
 */
static inline int
rte_pktmbuf_linearize(struct rte_mbuf *mbuf)
{
	if (rte_pktmbuf_is_contiguous(mbuf))
		return 0;
	return __rte_pktmbuf_linearize(mbuf);
}

/**
 * Dump an mbuf structure to a file.
 *
 * Dump all fields for the given packet mbuf and all its associated
 * segments (in the case of a chained buffer).
 *
 * @param f
 *   A pointer to a file for output
 * @param m
 *   The packet mbuf.
 * @param dump_len
 *   If dump_len != 0, also dump the "dump_len" first data bytes of
 *   the packet.
 */
void rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m, unsigned dump_len);

/**
 * Get the value of mbuf sched queue_id field.
 */
static inline uint32_t
rte_mbuf_sched_queue_get(const struct rte_mbuf *m)
{
	return m->hash.sched.queue_id;
}

/**
 * Get the value of mbuf sched traffic_class field.
 */
static inline uint8_t
rte_mbuf_sched_traffic_class_get(const struct rte_mbuf *m)
{
	return m->hash.sched.traffic_class;
}

/**
 * Get the value of mbuf sched color field.
 */
static inline uint8_t
rte_mbuf_sched_color_get(const struct rte_mbuf *m)
{
	return m->hash.sched.color;
}

/**
 * Get the values of mbuf sched queue_id, traffic_class and color.
 *
 * @param m
 *   Mbuf to read
 * @param queue_id
 *  Returns the queue id
 * @param traffic_class
 *  Returns the traffic class id
 * @param color
 *  Returns the colour id
 */
static inline void
rte_mbuf_sched_get(const struct rte_mbuf *m, uint32_t *queue_id,
			uint8_t *traffic_class,
			uint8_t *color)
{
	struct rte_mbuf_sched sched = m->hash.sched;

	*queue_id = sched.queue_id;
	*traffic_class = sched.traffic_class;
	*color = sched.color;
}

/**
 * Set the mbuf sched queue_id to the defined value.
 */
static inline void
rte_mbuf_sched_queue_set(struct rte_mbuf *m, uint32_t queue_id)
{
	m->hash.sched.queue_id = queue_id;
}

/**
 * Set the mbuf sched traffic_class id to the defined value.
 */
static inline void
rte_mbuf_sched_traffic_class_set(struct rte_mbuf *m, uint8_t traffic_class)
{
	m->hash.sched.traffic_class = traffic_class;
}

/**
 * Set the mbuf sched color id to the defined value.
 */
static inline void
rte_mbuf_sched_color_set(struct rte_mbuf *m, uint8_t color)
{
	m->hash.sched.color = color;
}

/**
 * Set the mbuf sched queue_id, traffic_class and color.
 *
 * @param m
 *   Mbuf to set
 * @param queue_id
 *  Queue id value to be set
 * @param traffic_class
 *  Traffic class id value to be set
 * @param color
 *  Color id to be set
 */
static inline void
rte_mbuf_sched_set(struct rte_mbuf *m, uint32_t queue_id,
			uint8_t traffic_class,
			uint8_t color)
{
	m->hash.sched = (struct rte_mbuf_sched){
				.queue_id = queue_id,
				.traffic_class = traffic_class,
				.color = color,
				.reserved = 0,
			};
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_MBUF_H_ */