summaryrefslogtreecommitdiffstats
path: root/lib/librte_ether/rte_flow.h
blob: 47c88ea520b5c03c31c0aad2abc16293c016a80d (plain)
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
/*-
 *   BSD LICENSE
 *
 *   Copyright 2016 6WIND S.A.
 *   Copyright 2016 Mellanox.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef RTE_FLOW_H_
#define RTE_FLOW_H_

/**
 * @file
 * RTE generic flow API
 *
 * This interface provides the ability to program packet matching and
 * associated actions in hardware through flow rules.
 */

#include <rte_arp.h>
#include <rte_ether.h>
#include <rte_icmp.h>
#include <rte_ip.h>
#include <rte_sctp.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_byteorder.h>
#include <rte_esp.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Flow rule attributes.
 *
 * Priorities are set on two levels: per group and per rule within groups.
 *
 * Lower values denote higher priority, the highest priority for both levels
 * is 0, so that a rule with priority 0 in group 8 is always matched after a
 * rule with priority 8 in group 0.
 *
 * Although optional, applications are encouraged to group similar rules as
 * much as possible to fully take advantage of hardware capabilities
 * (e.g. optimized matching) and work around limitations (e.g. a single
 * pattern type possibly allowed in a given group).
 *
 * Group and priority levels are arbitrary and up to the application, they
 * do not need to be contiguous nor start from 0, however the maximum number
 * varies between devices and may be affected by existing flow rules.
 *
 * If a packet is matched by several rules of a given group for a given
 * priority level, the outcome is undefined. It can take any path, may be
 * duplicated or even cause unrecoverable errors.
 *
 * Note that support for more than a single group and priority level is not
 * guaranteed.
 *
 * Flow rules can apply to inbound and/or outbound traffic (ingress/egress).
 *
 * Several pattern items and actions are valid and can be used in both
 * directions. Those valid for only one direction are described as such.
 *
 * At least one direction must be specified.
 *
 * Specifying both directions at once for a given rule is not recommended
 * but may be valid in a few cases (e.g. shared counter).
 */
struct rte_flow_attr {
	uint32_t group; /**< Priority group. */
	uint32_t priority; /**< Priority level within group. */
	uint32_t ingress:1; /**< Rule applies to ingress traffic. */
	uint32_t egress:1; /**< Rule applies to egress traffic. */
	uint32_t reserved:30; /**< Reserved, must be zero. */
};

/**
 * Matching pattern item types.
 *
 * Pattern items fall in two categories:
 *
 * - Matching protocol headers and packet data (ANY, RAW, ETH, VLAN, IPV4,
 *   IPV6, ICMP, UDP, TCP, SCTP, VXLAN and so on), usually associated with a
 *   specification structure. These must be stacked in the same order as the
 *   protocol layers to match, starting from the lowest.
 *
 * - Matching meta-data or affecting pattern processing (END, VOID, INVERT,
 *   PF, VF, PORT and so on), often without a specification structure. Since
 *   they do not match packet contents, these can be specified anywhere
 *   within item lists without affecting others.
 *
 * See the description of individual types for more information. Those
 * marked with [META] fall into the second category.
 */
enum rte_flow_item_type {
	/**
	 * [META]
	 *
	 * End marker for item lists. Prevents further processing of items,
	 * thereby ending the pattern.
	 *
	 * No associated specification structure.
	 */
	RTE_FLOW_ITEM_TYPE_END,

	/**
	 * [META]
	 *
	 * Used as a placeholder for convenience. It is ignored and simply
	 * discarded by PMDs.
	 *
	 * No associated specification structure.
	 */
	RTE_FLOW_ITEM_TYPE_VOID,

	/**
	 * [META]
	 *
	 * Inverted matching, i.e. process packets that do not match the
	 * pattern.
	 *
	 * No associated specification structure.
	 */
	RTE_FLOW_ITEM_TYPE_INVERT,

	/**
	 * Matches any protocol in place of the current layer, a single ANY
	 * may also stand for several protocol layers.
	 *
	 * See struct rte_flow_item_any.
	 */
	RTE_FLOW_ITEM_TYPE_ANY,

	/**
	 * [META]
	 *
	 * Matches packets addressed to the physical function of the device.
	 *
	 * If the underlying device function differs from the one that would
	 * normally receive the matched traffic, specifying this item
	 * prevents it from reaching that device unless the flow rule
	 * contains a PF action. Packets are not duplicated between device
	 * instances by default.
	 *
	 * No associated specification structure.
	 */
	RTE_FLOW_ITEM_TYPE_PF,

	/**
	 * [META]
	 *
	 * Matches packets addressed to a virtual function ID of the device.
	 *
	 * If the underlying device function differs from the one that would
	 * normally receive the matched traffic, specifying this item
	 * prevents it from reaching that device unless the flow rule
	 * contains a VF action. Packets are not duplicated between device
	 * instances by default.
	 *
	 * See struct rte_flow_item_vf.
	 */
	RTE_FLOW_ITEM_TYPE_VF,

	/**
	 * [META]
	 *
	 * Matches packets coming from the specified physical port of the
	 * underlying device.
	 *
	 * The first PORT item overrides the physical port normally
	 * associated with the specified DPDK input port (port_id). This
	 * item can be provided several times to match additional physical
	 * ports.
	 *
	 * See struct rte_flow_item_port.
	 */
	RTE_FLOW_ITEM_TYPE_PORT,

	/**
	 * Matches a byte string of a given length at a given offset.
	 *
	 * See struct rte_flow_item_raw.
	 */
	RTE_FLOW_ITEM_TYPE_RAW,

	/**
	 * Matches an Ethernet header.
	 *
	 * See struct rte_flow_item_eth.
	 */
	RTE_FLOW_ITEM_TYPE_ETH,

	/**
	 * Matches an 802.1Q/ad VLAN tag.
	 *
	 * See struct rte_flow_item_vlan.
	 */
	RTE_FLOW_ITEM_TYPE_VLAN,

	/**
	 * Matches an IPv4 header.
	 *
	 * See struct rte_flow_item_ipv4.
	 */
	RTE_FLOW_ITEM_TYPE_IPV4,

	/**
	 * Matches an IPv6 header.
	 *
	 * See struct rte_flow_item_ipv6.
	 */
	RTE_FLOW_ITEM_TYPE_IPV6,

	/**
	 * Matches an ICMP header.
	 *
	 * See struct rte_flow_item_icmp.
	 */
	RTE_FLOW_ITEM_TYPE_ICMP,

	/**
	 * Matches a UDP header.
	 *
	 * See struct rte_flow_item_udp.
	 */
	RTE_FLOW_ITEM_TYPE_UDP,

	/**
	 * Matches a TCP header.
	 *
	 * See struct rte_flow_item_tcp.
	 */
	RTE_FLOW_ITEM_TYPE_TCP,

	/**
	 * Matches a SCTP header.
	 *
	 * See struct rte_flow_item_sctp.
	 */
	RTE_FLOW_ITEM_TYPE_SCTP,

	/**
	 * Matches a VXLAN header.
	 *
	 * See struct rte_flow_item_vxlan.
	 */
	RTE_FLOW_ITEM_TYPE_VXLAN,

	/**
	 * Matches a E_TAG header.
	 *
	 * See struct rte_flow_item_e_tag.
	 */
	RTE_FLOW_ITEM_TYPE_E_TAG,

	/**
	 * Matches a NVGRE header.
	 *
	 * See struct rte_flow_item_nvgre.
	 */
	RTE_FLOW_ITEM_TYPE_NVGRE,

	/**
	 * Matches a MPLS header.
	 *
	 * See struct rte_flow_item_mpls.
	 */
	RTE_FLOW_ITEM_TYPE_MPLS,

	/**
	 * Matches a GRE header.
	 *
	 * See struct rte_flow_item_gre.
	 */
	RTE_FLOW_ITEM_TYPE_GRE,

	/**
	 * [META]
	 *
	 * Fuzzy pattern match, expect faster than default.
	 *
	 * This is for device that support fuzzy matching option.
	 * Usually a fuzzy matching is fast but the cost is accuracy.
	 *
	 * See struct rte_flow_item_fuzzy.
	 */
	RTE_FLOW_ITEM_TYPE_FUZZY,

	/**
	 * Matches a GTP header.
	 *
	 * Configure flow for GTP packets.
	 *
	 * See struct rte_flow_item_gtp.
	 */
	RTE_FLOW_ITEM_TYPE_GTP,

	/**
	 * Matches a GTP header.
	 *
	 * Configure flow for GTP-C packets.
	 *
	 * See struct rte_flow_item_gtp.
	 */
	RTE_FLOW_ITEM_TYPE_GTPC,

	/**
	 * Matches a GTP header.
	 *
	 * Configure flow for GTP-U packets.
	 *
	 * See struct rte_flow_item_gtp.
	 */
	RTE_FLOW_ITEM_TYPE_GTPU,

	/**
	 * Matches a ESP header.
	 *
	 * See struct rte_flow_item_esp.
	 */
	RTE_FLOW_ITEM_TYPE_ESP,
};

/**
 * RTE_FLOW_ITEM_TYPE_ANY
 *
 * Matches any protocol in place of the current layer, a single ANY may also
 * stand for several protocol layers.
 *
 * This is usually specified as the first pattern item when looking for a
 * protocol anywhere in a packet.
 *
 * A zeroed mask stands for any number of layers.
 */
struct rte_flow_item_any {
	uint32_t num; /**< Number of layers covered. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_ANY. */
#ifndef __cplusplus
static const struct rte_flow_item_any rte_flow_item_any_mask = {
	.num = 0x00000000,
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_VF
 *
 * Matches packets addressed to a virtual function ID of the device.
 *
 * If the underlying device function differs from the one that would
 * normally receive the matched traffic, specifying this item prevents it
 * from reaching that device unless the flow rule contains a VF
 * action. Packets are not duplicated between device instances by default.
 *
 * - Likely to return an error or never match any traffic if this causes a
 *   VF device to match traffic addressed to a different VF.
 * - Can be specified multiple times to match traffic addressed to several
 *   VF IDs.
 * - Can be combined with a PF item to match both PF and VF traffic.
 *
 * A zeroed mask can be used to match any VF ID.
 */
struct rte_flow_item_vf {
	uint32_t id; /**< Destination VF ID. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_VF. */
#ifndef __cplusplus
static const struct rte_flow_item_vf rte_flow_item_vf_mask = {
	.id = 0x00000000,
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_PORT
 *
 * Matches packets coming from the specified physical port of the underlying
 * device.
 *
 * The first PORT item overrides the physical port normally associated with
 * the specified DPDK input port (port_id). This item can be provided
 * several times to match additional physical ports.
 *
 * Note that physical ports are not necessarily tied to DPDK input ports
 * (port_id) when those are not under DPDK control. Possible values are
 * specific to each device, they are not necessarily indexed from zero and
 * may not be contiguous.
 *
 * As a device property, the list of allowed values as well as the value
 * associated with a port_id should be retrieved by other means.
 *
 * A zeroed mask can be used to match any port index.
 */
struct rte_flow_item_port {
	uint32_t index; /**< Physical port index. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_PORT. */
#ifndef __cplusplus
static const struct rte_flow_item_port rte_flow_item_port_mask = {
	.index = 0x00000000,
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_RAW
 *
 * Matches a byte string of a given length at a given offset.
 *
 * Offset is either absolute (using the start of the packet) or relative to
 * the end of the previous matched item in the stack, in which case negative
 * values are allowed.
 *
 * If search is enabled, offset is used as the starting point. The search
 * area can be delimited by setting limit to a nonzero value, which is the
 * maximum number of bytes after offset where the pattern may start.
 *
 * Matching a zero-length pattern is allowed, doing so resets the relative
 * offset for subsequent items.
 *
 * This type does not support ranges (struct rte_flow_item.last).
 */
struct rte_flow_item_raw {
	uint32_t relative:1; /**< Look for pattern after the previous item. */
	uint32_t search:1; /**< Search pattern from offset (see also limit). */
	uint32_t reserved:30; /**< Reserved, must be set to zero. */
	int32_t offset; /**< Absolute or relative offset for pattern. */
	uint16_t limit; /**< Search area limit for start of pattern. */
	uint16_t length; /**< Pattern length. */
	uint8_t pattern[]; /**< Byte string to look for. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_RAW. */
#ifndef __cplusplus
static const struct rte_flow_item_raw rte_flow_item_raw_mask = {
	.relative = 1,
	.search = 1,
	.reserved = 0x3fffffff,
	.offset = 0xffffffff,
	.limit = 0xffff,
	.length = 0xffff,
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_ETH
 *
 * Matches an Ethernet header.
 */
struct rte_flow_item_eth {
	struct ether_addr dst; /**< Destination MAC. */
	struct ether_addr src; /**< Source MAC. */
	rte_be16_t type; /**< EtherType. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_ETH. */
#ifndef __cplusplus
static const struct rte_flow_item_eth rte_flow_item_eth_mask = {
	.dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
	.src.addr_bytes = "\xff\xff\xff\xff\xff\xff",
	.type = RTE_BE16(0x0000),
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_VLAN
 *
 * Matches an 802.1Q/ad VLAN tag.
 *
 * This type normally follows either RTE_FLOW_ITEM_TYPE_ETH or
 * RTE_FLOW_ITEM_TYPE_VLAN.
 */
struct rte_flow_item_vlan {
	rte_be16_t tpid; /**< Tag protocol identifier. */
	rte_be16_t tci; /**< Tag control information. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_VLAN. */
#ifndef __cplusplus
static const struct rte_flow_item_vlan rte_flow_item_vlan_mask = {
	.tpid = RTE_BE16(0x0000),
	.tci = RTE_BE16(0xffff),
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_IPV4
 *
 * Matches an IPv4 header.
 *
 * Note: IPv4 options are handled by dedicated pattern items.
 */
struct rte_flow_item_ipv4 {
	struct ipv4_hdr hdr; /**< IPv4 header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_IPV4. */
#ifndef __cplusplus
static const struct rte_flow_item_ipv4 rte_flow_item_ipv4_mask = {
	.hdr = {
		.src_addr = RTE_BE32(0xffffffff),
		.dst_addr = RTE_BE32(0xffffffff),
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_IPV6.
 *
 * Matches an IPv6 header.
 *
 * Note: IPv6 options are handled by dedicated pattern items.
 */
struct rte_flow_item_ipv6 {
	struct ipv6_hdr hdr; /**< IPv6 header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_IPV6. */
#ifndef __cplusplus
static const struct rte_flow_item_ipv6 rte_flow_item_ipv6_mask = {
	.hdr = {
		.src_addr =
			"\xff\xff\xff\xff\xff\xff\xff\xff"
			"\xff\xff\xff\xff\xff\xff\xff\xff",
		.dst_addr =
			"\xff\xff\xff\xff\xff\xff\xff\xff"
			"\xff\xff\xff\xff\xff\xff\xff\xff",
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_ICMP.
 *
 * Matches an ICMP header.
 */
struct rte_flow_item_icmp {
	struct icmp_hdr hdr; /**< ICMP header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_ICMP. */
#ifndef __cplusplus
static const struct rte_flow_item_icmp rte_flow_item_icmp_mask = {
	.hdr = {
		.icmp_type = 0xff,
		.icmp_code = 0xff,
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_UDP.
 *
 * Matches a UDP header.
 */
struct rte_flow_item_udp {
	struct udp_hdr hdr; /**< UDP header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_UDP. */
#ifndef __cplusplus
static const struct rte_flow_item_udp rte_flow_item_udp_mask = {
	.hdr = {
		.src_port = RTE_BE16(0xffff),
		.dst_port = RTE_BE16(0xffff),
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_TCP.
 *
 * Matches a TCP header.
 */
struct rte_flow_item_tcp {
	struct tcp_hdr hdr; /**< TCP header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_TCP. */
#ifndef __cplusplus
static const struct rte_flow_item_tcp rte_flow_item_tcp_mask = {
	.hdr = {
		.src_port = RTE_BE16(0xffff),
		.dst_port = RTE_BE16(0xffff),
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_SCTP.
 *
 * Matches a SCTP header.
 */
struct rte_flow_item_sctp {
	struct sctp_hdr hdr; /**< SCTP header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_SCTP. */
#ifndef __cplusplus
static const struct rte_flow_item_sctp rte_flow_item_sctp_mask = {
	.hdr = {
		.src_port = RTE_BE16(0xffff),
		.dst_port = RTE_BE16(0xffff),
	},
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_VXLAN.
 *
 * Matches a VXLAN header (RFC 7348).
 */
struct rte_flow_item_vxlan {
	uint8_t flags; /**< Normally 0x08 (I flag). */
	uint8_t rsvd0[3]; /**< Reserved, normally 0x000000. */
	uint8_t vni[3]; /**< VXLAN identifier. */
	uint8_t rsvd1; /**< Reserved, normally 0x00. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_VXLAN. */
#ifndef __cplusplus
static const struct rte_flow_item_vxlan rte_flow_item_vxlan_mask = {
	.vni = "\xff\xff\xff",
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_E_TAG.
 *
 * Matches a E-tag header.
 */
struct rte_flow_item_e_tag {
	rte_be16_t tpid; /**< Tag protocol identifier (0x893F). */
	/**
	 * E-Tag control information (E-TCI).
	 * E-PCP (3b), E-DEI (1b), ingress E-CID base (12b).
	 */
	rte_be16_t epcp_edei_in_ecid_b;
	/** Reserved (2b), GRP (2b), E-CID base (12b). */
	rte_be16_t rsvd_grp_ecid_b;
	uint8_t in_ecid_e; /**< Ingress E-CID ext. */
	uint8_t ecid_e; /**< E-CID ext. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_E_TAG. */
#ifndef __cplusplus
static const struct rte_flow_item_e_tag rte_flow_item_e_tag_mask = {
	.rsvd_grp_ecid_b = RTE_BE16(0x3fff),
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_NVGRE.
 *
 * Matches a NVGRE header.
 */
struct rte_flow_item_nvgre {
	/**
	 * Checksum (1b), undefined (1b), key bit (1b), sequence number (1b),
	 * reserved 0 (9b), version (3b).
	 *
	 * c_k_s_rsvd0_ver must have value 0x2000 according to RFC 7637.
	 */
	rte_be16_t c_k_s_rsvd0_ver;
	rte_be16_t protocol; /**< Protocol type (0x6558). */
	uint8_t tni[3]; /**< Virtual subnet ID. */
	uint8_t flow_id; /**< Flow ID. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_NVGRE. */
#ifndef __cplusplus
static const struct rte_flow_item_nvgre rte_flow_item_nvgre_mask = {
	.tni = "\xff\xff\xff",
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_MPLS.
 *
 * Matches a MPLS header.
 */
struct rte_flow_item_mpls {
	/**
	 * Label (20b), TC (3b), Bottom of Stack (1b).
	 */
	uint8_t label_tc_s[3];
	uint8_t ttl; /** Time-to-Live. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_MPLS. */
#ifndef __cplusplus
static const struct rte_flow_item_mpls rte_flow_item_mpls_mask = {
	.label_tc_s = "\xff\xff\xf0",
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_GRE.
 *
 * Matches a GRE header.
 */
struct rte_flow_item_gre {
	/**
	 * Checksum (1b), reserved 0 (12b), version (3b).
	 * Refer to RFC 2784.
	 */
	rte_be16_t c_rsvd0_ver;
	rte_be16_t protocol; /**< Protocol type. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_GRE. */
#ifndef __cplusplus
static const struct rte_flow_item_gre rte_flow_item_gre_mask = {
	.protocol = RTE_BE16(0xffff),
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_FUZZY
 *
 * Fuzzy pattern match, expect faster than default.
 *
 * This is for device that support fuzzy match option.
 * Usually a fuzzy match is fast but the cost is accuracy.
 * i.e. Signature Match only match pattern's hash value, but it is
 * possible two different patterns have the same hash value.
 *
 * Matching accuracy level can be configure by threshold.
 * Driver can divide the range of threshold and map to different
 * accuracy levels that device support.
 *
 * Threshold 0 means perfect match (no fuzziness), while threshold
 * 0xffffffff means fuzziest match.
 */
struct rte_flow_item_fuzzy {
	uint32_t thresh; /**< Accuracy threshold. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_FUZZY. */
#ifndef __cplusplus
static const struct rte_flow_item_fuzzy rte_flow_item_fuzzy_mask = {
	.thresh = 0xffffffff,
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_GTP.
 *
 * Matches a GTPv1 header.
 */
struct rte_flow_item_gtp {
	/**
	 * Version (3b), protocol type (1b), reserved (1b),
	 * Extension header flag (1b),
	 * Sequence number flag (1b),
	 * N-PDU number flag (1b).
	 */
	uint8_t v_pt_rsv_flags;
	uint8_t msg_type; /**< Message type. */
	rte_be16_t msg_len; /**< Message length. */
	rte_be32_t teid; /**< Tunnel endpoint identifier. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_GTP. */
#ifndef __cplusplus
static const struct rte_flow_item_gtp rte_flow_item_gtp_mask = {
	.teid = RTE_BE32(0xffffffff),
};
#endif

/**
 * RTE_FLOW_ITEM_TYPE_ESP
 *
 * Matches an ESP header.
 */
struct rte_flow_item_esp {
	struct esp_hdr hdr; /**< ESP header definition. */
};

/** Default mask for RTE_FLOW_ITEM_TYPE_ESP. */
#ifndef __cplusplus
static const struct rte_flow_item_esp rte_flow_item_esp_mask = {
	.hdr = {
		.spi = 0xffffffff,
	},
};
#endif

/**
 * Matching pattern item definition.
 *
 * A pattern is formed by stacking items starting from the lowest protocol
 * layer to match. This stacking restriction does not apply to meta items
 * which can be placed anywhere in the stack without affecting the meaning
 * of the resulting pattern.
 *
 * Patterns are terminated by END items.
 *
 * The spec field should be a valid pointer to a structure of the related
 * item type. It may remain unspecified (NULL) in many cases to request
 * broad (nonspecific) matching. In such cases, last and mask must also be
 * set to NULL.
 *
 * Optionally, last can point to a structure of the same type to define an
 * inclusive range. This is mostly supported by integer and address fields,
 * may cause errors otherwise. Fields that do not support ranges must be set
 * to 0 or to the same value as the corresponding fields in spec.
 *
 * Only the fields defined to nonzero values in the default masks (see
 * rte_flow_item_{name}_mask constants) are considered relevant by
 * default. This can be overridden by providing a mask structure of the
 * same type with applicable bits set to one. It can also be used to
 * partially filter out specific fields (e.g. as an alternate mean to match
 * ranges of IP addresses).
 *
 * Mask is a simple bit-mask applied before interpreting the contents of
 * spec and last, which may yield unexpected results if not used
 * carefully. For example, if for an IPv4 address field, spec provides
 * 10.1.2.3, last provides 10.3.4.5 and mask provides 255.255.0.0, the
 * effective range becomes 10.1.0.0 to 10.3.255.255.
 */
struct rte_flow_item {
	enum rte_flow_item_type type; /**< Item type. */
	const void *spec; /**< Pointer to item specification structure. */
	const void *last; /**< Defines an inclusive range (spec to last). */
	const void *mask; /**< Bit-mask applied to spec and last. */
};

/**
 * Action types.
 *
 * Each possible action is represented by a type. Some have associated
 * configuration structures. Several actions combined in a list can be
 * affected to a flow rule. That list is not ordered.
 *
 * They fall in three categories:
 *
 * - Terminating actions (such as QUEUE, DROP, RSS, PF, VF) that prevent
 *   processing matched packets by subsequent flow rules, unless overridden
 *   with PASSTHRU.
 *
 * - Non terminating actions (PASSTHRU, DUP) that leave matched packets up
 *   for additional processing by subsequent flow rules.
 *
 * - Other non terminating meta actions that do not affect the fate of
 *   packets (END, VOID, MARK, FLAG, COUNT).
 *
 * When several actions are combined in a flow rule, they should all have
 * different types (e.g. dropping a packet twice is not possible).
 *
 * Only the last action of a given type is taken into account. PMDs still
 * perform error checking on the entire list.
 *
 * Note that PASSTHRU is the only action able to override a terminating
 * rule.
 */
enum rte_flow_action_type {
	/**
	 * [META]
	 *
	 * End marker for action lists. Prevents further processing of
	 * actions, thereby ending the list.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_END,

	/**
	 * [META]
	 *
	 * Used as a placeholder for convenience. It is ignored and simply
	 * discarded by PMDs.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_VOID,

	/**
	 * Leaves packets up for additional processing by subsequent flow
	 * rules. This is the default when a rule does not contain a
	 * terminating action, but can be specified to force a rule to
	 * become non-terminating.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_PASSTHRU,

	/**
	 * [META]
	 *
	 * Attaches an integer value to packets and sets PKT_RX_FDIR and
	 * PKT_RX_FDIR_ID mbuf flags.
	 *
	 * See struct rte_flow_action_mark.
	 */
	RTE_FLOW_ACTION_TYPE_MARK,

	/**
	 * [META]
	 *
	 * Flags packets. Similar to MARK without a specific value; only
	 * sets the PKT_RX_FDIR mbuf flag.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_FLAG,

	/**
	 * Assigns packets to a given queue index.
	 *
	 * See struct rte_flow_action_queue.
	 */
	RTE_FLOW_ACTION_TYPE_QUEUE,

	/**
	 * Drops packets.
	 *
	 * PASSTHRU overrides this action if both are specified.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_DROP,

	/**
	 * [META]
	 *
	 * Enables counters for this rule.
	 *
	 * These counters can be retrieved and reset through rte_flow_query(),
	 * see struct rte_flow_query_count.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_COUNT,

	/**
	 * Duplicates packets to a given queue index.
	 *
	 * This is normally combined with QUEUE, however when used alone, it
	 * is actually similar to QUEUE + PASSTHRU.
	 *
	 * See struct rte_flow_action_dup.
	 */
	RTE_FLOW_ACTION_TYPE_DUP,

	/**
	 * Similar to QUEUE, except RSS is additionally performed on packets
	 * to spread them among several queues according to the provided
	 * parameters.
	 *
	 * See struct rte_flow_action_rss.
	 */
	RTE_FLOW_ACTION_TYPE_RSS,

	/**
	 * Redirects packets to the physical function (PF) of the current
	 * device.
	 *
	 * No associated configuration structure.
	 */
	RTE_FLOW_ACTION_TYPE_PF,

	/**
	 * Redirects packets to the virtual function (VF) of the current
	 * device with the specified ID.
	 *
	 * See struct rte_flow_action_vf.
	 */
	RTE_FLOW_ACTION_TYPE_VF,

	/**
	 * Traffic metering and policing (MTR).
	 *
	 * See struct rte_flow_action_meter.
	 * See file rte_mtr.h for MTR object configuration.
	 */
	RTE_FLOW_ACTION_TYPE_METER,

	/**
	 * Redirects packets to security engine of current device for security
	 * processing as specified by security session.
	 *
	 * See struct rte_flow_action_security.
	 */
	RTE_FLOW_ACTION_TYPE_SECURITY
};

/**
 * RTE_FLOW_ACTION_TYPE_MARK
 *
 * Attaches an integer value to packets and sets PKT_RX_FDIR and
 * PKT_RX_FDIR_ID mbuf flags.
 *
 * This value is arbitrary and application-defined. Maximum allowed value
 * depends on the underlying implementation. It is returned in the
 * hash.fdir.hi mbuf field.
 */
struct rte_flow_action_mark {
	uint32_t id; /**< Integer value to return with packets. */
};

/**
 * RTE_FLOW_ACTION_TYPE_QUEUE
 *
 * Assign packets to a given queue index.
 *
 * Terminating by default.
 */
struct rte_flow_action_queue {
	uint16_t index; /**< Queue index to use. */
};

/**
 * RTE_FLOW_ACTION_TYPE_COUNT (query)
 *
 * Query structure to retrieve and reset flow rule counters.
 */
struct rte_flow_query_count {
	uint32_t reset:1; /**< Reset counters after query [in]. */
	uint32_t hits_set:1; /**< hits field is set [out]. */
	uint32_t bytes_set:1; /**< bytes field is set [out]. */
	uint32_t reserved:29; /**< Reserved, must be zero [in, out]. */
	uint64_t hits; /**< Number of hits for this rule [out]. */
	uint64_t bytes; /**< Number of bytes through this rule [out]. */
};

/**
 * RTE_FLOW_ACTION_TYPE_DUP
 *
 * Duplicates packets to a given queue index.
 *
 * This is normally combined with QUEUE, however when used alone, it is
 * actually similar to QUEUE + PASSTHRU.
 *
 * Non-terminating by default.
 */
struct rte_flow_action_dup {
	uint16_t index; /**< Queue index to duplicate packets to. */
};

/**
 * RTE_FLOW_ACTION_TYPE_RSS
 *
 * Similar to QUEUE, except RSS is additionally performed on packets to
 * spread them among several queues according to the provided parameters.
 *
 * Note: RSS hash result is stored in the hash.rss mbuf field which overlaps
 * hash.fdir.lo. Since the MARK action sets the hash.fdir.hi field only,
 * both can be requested simultaneously.
 *
 * Terminating by default.
 */
struct rte_flow_action_rss {
	const struct rte_eth_rss_conf *rss_conf; /**< RSS parameters. */
	uint16_t num; /**< Number of entries in queue[]. */
	uint16_t queue[]; /**< Queues indices to use. */
};

/**
 * RTE_FLOW_ACTION_TYPE_VF
 *
 * Redirects packets to a virtual function (VF) of the current device.
 *
 * Packets matched by a VF pattern item can be redirected to their original
 * VF ID instead of the specified one. This parameter may not be available
 * and is not guaranteed to work properly if the VF part is matched by a
 * prior flow rule or if packets are not addressed to a VF in the first
 * place.
 *
 * Terminating by default.
 */
struct rte_flow_action_vf {
	uint32_t original:1; /**< Use original VF ID if possible. */
	uint32_t reserved:31; /**< Reserved, must be zero. */
	uint32_t id; /**< VF ID to redirect packets to. */
};

/**
 * RTE_FLOW_ACTION_TYPE_METER
 *
 * Traffic metering and policing (MTR).
 *
 * Packets matched by items of this type can be either dropped or passed to the
 * next item with their color set by the MTR object.
 *
 * Non-terminating by default.
 */
struct rte_flow_action_meter {
	uint32_t mtr_id; /**< MTR object ID created with rte_mtr_create(). */
};

/**
 * RTE_FLOW_ACTION_TYPE_SECURITY
 *
 * Perform the security action on flows matched by the pattern items
 * according to the configuration of the security session.
 *
 * This action modifies the payload of matched flows. For INLINE_CRYPTO, the
 * security protocol headers and IV are fully provided by the application as
 * specified in the flow pattern. The payload of matching packets is
 * encrypted on egress, and decrypted and authenticated on ingress.
 * For INLINE_PROTOCOL, the security protocol is fully offloaded to HW,
 * providing full encapsulation and decapsulation of packets in security
 * protocols. The flow pattern specifies both the outer security header fields
 * and the inner packet fields. The security session specified in the action
 * must match the pattern parameters.
 *
 * The security session specified in the action must be created on the same
 * port as the flow action that is being specified.
 *
 * The ingress/egress flow attribute should match that specified in the
 * security session if the security session supports the definition of the
 * direction.
 *
 * Multiple flows can be configured to use the same security session.
 *
 * Non-terminating by default.
 */
struct rte_flow_action_security {
	void *security_session; /**< Pointer to security session structure. */
};

/**
 * Definition of a single action.
 *
 * A list of actions is terminated by a END action.
 *
 * For simple actions without a configuration structure, conf remains NULL.
 */
struct rte_flow_action {
	enum rte_flow_action_type type; /**< Action type. */
	const void *conf; /**< Pointer to action configuration structure. */
};

/**
 * Opaque type returned after successfully creating a flow.
 *
 * This handle can be used to manage and query the related flow (e.g. to
 * destroy it or retrieve counters).
 */
struct rte_flow;

/**
 * Verbose error types.
 *
 * Most of them provide the type of the object referenced by struct
 * rte_flow_error.cause.
 */
enum rte_flow_error_type {
	RTE_FLOW_ERROR_TYPE_NONE, /**< No error. */
	RTE_FLOW_ERROR_TYPE_UNSPECIFIED, /**< Cause unspecified. */
	RTE_FLOW_ERROR_TYPE_HANDLE, /**< Flow rule (handle). */
	RTE_FLOW_ERROR_TYPE_ATTR_GROUP, /**< Group field. */
	RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, /**< Priority field. */
	RTE_FLOW_ERROR_TYPE_ATTR_INGRESS, /**< Ingress field. */
	RTE_FLOW_ERROR_TYPE_ATTR_EGRESS, /**< Egress field. */
	RTE_FLOW_ERROR_TYPE_ATTR, /**< Attributes structure. */
	RTE_FLOW_ERROR_TYPE_ITEM_NUM, /**< Pattern length. */
	RTE_FLOW_ERROR_TYPE_ITEM, /**< Specific pattern item. */
	RTE_FLOW_ERROR_TYPE_ACTION_NUM, /**< Number of actions. */
	RTE_FLOW_ERROR_TYPE_ACTION, /**< Specific action. */
};

/**
 * Verbose error structure definition.
 *
 * This object is normally allocated by applications and set by PMDs, the
 * message points to a constant string which does not need to be freed by
 * the application, however its pointer can be considered valid only as long
 * as its associated DPDK port remains configured. Closing the underlying
 * device or unloading the PMD invalidates it.
 *
 * Both cause and message may be NULL regardless of the error type.
 */
struct rte_flow_error {
	enum rte_flow_error_type type; /**< Cause field and error types. */
	const void *cause; /**< Object responsible for the error. */
	const char *message; /**< Human-readable error message. */
};

/**
 * Check whether a flow rule can be created on a given port.
 *
 * The flow rule is validated for correctness and whether it could be accepted
 * by the device given sufficient resources. The rule is checked against the
 * current device mode and queue configuration. The flow rule may also
 * optionally be validated against existing flow rules and device resources.
 * This function has no effect on the target device.
 *
 * The returned value is guaranteed to remain valid only as long as no
 * successful calls to rte_flow_create() or rte_flow_destroy() are made in
 * the meantime and no device parameter affecting flow rules in any way are
 * modified, due to possible collisions or resource limitations (although in
 * such cases EINVAL should not be returned).
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param[in] attr
 *   Flow rule attributes.
 * @param[in] pattern
 *   Pattern specification (list terminated by the END pattern item).
 * @param[in] actions
 *   Associated actions (list terminated by the END action).
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   0 if flow rule is valid and can be created. A negative errno value
 *   otherwise (rte_errno is also set), the following errors are defined:
 *
 *   -ENOSYS: underlying device does not support this functionality.
 *
 *   -EINVAL: unknown or invalid rule specification.
 *
 *   -ENOTSUP: valid but unsupported rule specification (e.g. partial
 *   bit-masks are unsupported).
 *
 *   -EEXIST: collision with an existing rule. Only returned if device
 *   supports flow rule collision checking and there was a flow rule
 *   collision. Not receiving this return code is no guarantee that creating
 *   the rule will not fail due to a collision.
 *
 *   -ENOMEM: not enough memory to execute the function, or if the device
 *   supports resource validation, resource limitation on the device.
 *
 *   -EBUSY: action cannot be performed due to busy device resources, may
 *   succeed if the affected queues or even the entire port are in a stopped
 *   state (see rte_eth_dev_rx_queue_stop() and rte_eth_dev_stop()).
 */
int
rte_flow_validate(uint16_t port_id,
		  const struct rte_flow_attr *attr,
		  const struct rte_flow_item pattern[],
		  const struct rte_flow_action actions[],
		  struct rte_flow_error *error);

/**
 * Create a flow rule on a given port.
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param[in] attr
 *   Flow rule attributes.
 * @param[in] pattern
 *   Pattern specification (list terminated by the END pattern item).
 * @param[in] actions
 *   Associated actions (list terminated by the END action).
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   A valid handle in case of success, NULL otherwise and rte_errno is set
 *   to the positive version of one of the error codes defined for
 *   rte_flow_validate().
 */
struct rte_flow *
rte_flow_create(uint16_t port_id,
		const struct rte_flow_attr *attr,
		const struct rte_flow_item pattern[],
		const struct rte_flow_action actions[],
		struct rte_flow_error *error);

/**
 * Destroy a flow rule on a given port.
 *
 * Failure to destroy a flow rule handle may occur when other flow rules
 * depend on it, and destroying it would result in an inconsistent state.
 *
 * This function is only guaranteed to succeed if handles are destroyed in
 * reverse order of their creation.
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param flow
 *   Flow rule handle to destroy.
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
rte_flow_destroy(uint16_t port_id,
		 struct rte_flow *flow,
		 struct rte_flow_error *error);

/**
 * Destroy all flow rules associated with a port.
 *
 * In the unlikely event of failure, handles are still considered destroyed
 * and no longer valid but the port must be assumed to be in an inconsistent
 * state.
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
rte_flow_flush(uint16_t port_id,
	       struct rte_flow_error *error);

/**
 * Query an existing flow rule.
 *
 * This function allows retrieving flow-specific data such as counters.
 * Data is gathered by special actions which must be present in the flow
 * rule definition.
 *
 * \see RTE_FLOW_ACTION_TYPE_COUNT
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param flow
 *   Flow rule handle to query.
 * @param action
 *   Action type to query.
 * @param[in, out] data
 *   Pointer to storage for the associated query data type.
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
rte_flow_query(uint16_t port_id,
	       struct rte_flow *flow,
	       enum rte_flow_action_type action,
	       void *data,
	       struct rte_flow_error *error);

/**
 * Restrict ingress traffic to the defined flow rules.
 *
 * Isolated mode guarantees that all ingress traffic comes from defined flow
 * rules only (current and future).
 *
 * Besides making ingress more deterministic, it allows PMDs to safely reuse
 * resources otherwise assigned to handle the remaining traffic, such as
 * global RSS configuration settings, VLAN filters, MAC address entries,
 * legacy filter API rules and so on in order to expand the set of possible
 * flow rule types.
 *
 * Calling this function as soon as possible after device initialization,
 * ideally before the first call to rte_eth_dev_configure(), is recommended
 * to avoid possible failures due to conflicting settings.
 *
 * Once effective, leaving isolated mode may not be possible depending on
 * PMD implementation.
 *
 * Additionally, the following functionality has no effect on the underlying
 * port and may return errors such as ENOTSUP ("not supported"):
 *
 * - Toggling promiscuous mode.
 * - Toggling allmulticast mode.
 * - Configuring MAC addresses.
 * - Configuring multicast addresses.
 * - Configuring VLAN filters.
 * - Configuring Rx filters through the legacy API (e.g. FDIR).
 * - Configuring global RSS settings.
 *
 * @param port_id
 *   Port identifier of Ethernet device.
 * @param set
 *   Nonzero to enter isolated mode, attempt to leave it otherwise.
 * @param[out] error
 *   Perform verbose error reporting if not NULL. PMDs initialize this
 *   structure in case of error only.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
int
rte_flow_isolate(uint16_t port_id, int set, struct rte_flow_error *error);

/**
 * Initialize flow error structure.
 *
 * @param[out] error
 *   Pointer to flow error structure (may be NULL).
 * @param code
 *   Related error code (rte_errno).
 * @param type
 *   Cause field and error types.
 * @param cause
 *   Object responsible for the error.
 * @param message
 *   Human-readable error message.
 *
 * @return
 *   Negative error code (errno value) and rte_errno is set.
 */
int
rte_flow_error_set(struct rte_flow_error *error,
		   int code,
		   enum rte_flow_error_type type,
		   const void *cause,
		   const char *message);

/**
 * Generic flow representation.
 *
 * This form is sufficient to describe an rte_flow independently from any
 * PMD implementation and allows for replayability and identification.
 */
struct rte_flow_desc {
	size_t size; /**< Allocated space including data[]. */
	struct rte_flow_attr attr; /**< Attributes. */
	struct rte_flow_item *items; /**< Items. */
	struct rte_flow_action *actions; /**< Actions. */
	uint8_t data[]; /**< Storage for items/actions. */
};

/**
 * Copy an rte_flow rule description.
 *
 * @param[in] fd
 *   Flow rule description.
 * @param[in] len
 *   Total size of allocated data for the flow description.
 * @param[in] attr
 *   Flow rule attributes.
 * @param[in] items
 *   Pattern specification (list terminated by the END pattern item).
 * @param[in] actions
 *   Associated actions (list terminated by the END action).
 *
 * @return
 *   If len is greater or equal to the size of the flow, the total size of the
 *   flow description and its data.
 *   If len is lower than the size of the flow, the number of bytes that would
 *   have been written to desc had it been sufficient. Nothing is written.
 */
size_t
rte_flow_copy(struct rte_flow_desc *fd, size_t len,
	      const struct rte_flow_attr *attr,
	      const struct rte_flow_item *items,
	      const struct rte_flow_action *actions);

#ifdef __cplusplus
}
#endif

#endif /* RTE_FLOW_H_ */