summaryrefslogtreecommitdiffstats
path: root/lib/librte_eventdev/rte_eventdev.h
blob: 20e7293e08579b85a30c6b293693f3a5ce153ea7 (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
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
/*
 *   BSD LICENSE
 *
 *   Copyright 2016 Cavium.
 *   Copyright 2016 Intel Corporation.
 *   Copyright 2016 NXP.
 *
 *   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 Cavium 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_EVENTDEV_H_
#define _RTE_EVENTDEV_H_

/**
 * @file
 *
 * RTE Event Device API
 *
 * In a polling model, lcores poll ethdev ports and associated rx queues
 * directly to look for packet. In an event driven model, by contrast, lcores
 * call the scheduler that selects packets for them based on programmer
 * specified criteria. Eventdev library adds support for event driven
 * programming model, which offer applications automatic multicore scaling,
 * dynamic load balancing, pipelining, packet ingress order maintenance and
 * synchronization services to simplify application packet processing.
 *
 * The Event Device API is composed of two parts:
 *
 * - The application-oriented Event API that includes functions to setup
 *   an event device (configure it, setup its queues, ports and start it), to
 *   establish the link between queues to port and to receive events, and so on.
 *
 * - The driver-oriented Event API that exports a function allowing
 *   an event poll Mode Driver (PMD) to simultaneously register itself as
 *   an event device driver.
 *
 * Event device components:
 *
 *                     +-----------------+
 *                     | +-------------+ |
 *        +-------+    | |    flow 0   | |
 *        |Packet |    | +-------------+ |
 *        |event  |    | +-------------+ |
 *        |       |    | |    flow 1   | |port_link(port0, queue0)
 *        +-------+    | +-------------+ |     |     +--------+
 *        +-------+    | +-------------+ o-----v-----o        |dequeue +------+
 *        |Crypto |    | |    flow n   | |           | event  +------->|Core 0|
 *        |work   |    | +-------------+ o----+      | port 0 |        |      |
 *        |done ev|    |  event queue 0  |    |      +--------+        +------+
 *        +-------+    +-----------------+    |
 *        +-------+                           |
 *        |Timer  |    +-----------------+    |      +--------+
 *        |expiry |    | +-------------+ |    +------o        |dequeue +------+
 *        |event  |    | |    flow 0   | o-----------o event  +------->|Core 1|
 *        +-------+    | +-------------+ |      +----o port 1 |        |      |
 *       Event enqueue | +-------------+ |      |    +--------+        +------+
 *     o-------------> | |    flow 1   | |      |
 *        enqueue(     | +-------------+ |      |
 *        queue_id,    |                 |      |    +--------+        +------+
 *        flow_id,     | +-------------+ |      |    |        |dequeue |Core 2|
 *        sched_type,  | |    flow n   | o-----------o event  +------->|      |
 *        event_type,  | +-------------+ |      |    | port 2 |        +------+
 *        subev_type,  |  event queue 1  |      |    +--------+
 *        event)       +-----------------+      |    +--------+
 *                                              |    |        |dequeue +------+
 *        +-------+    +-----------------+      |    | event  +------->|Core n|
 *        |Core   |    | +-------------+ o-----------o port n |        |      |
 *        |(SW)   |    | |    flow 0   | |      |    +--------+        +--+---+
 *        |event  |    | +-------------+ |      |                         |
 *        +-------+    | +-------------+ |      |                         |
 *            ^        | |    flow 1   | |      |                         |
 *            |        | +-------------+ o------+                         |
 *            |        | +-------------+ |                                |
 *            |        | |    flow n   | |                                |
 *            |        | +-------------+ |                                |
 *            |        |  event queue n  |                                |
 *            |        +-----------------+                                |
 *            |                                                           |
 *            +-----------------------------------------------------------+
 *
 * Event device: A hardware or software-based event scheduler.
 *
 * Event: A unit of scheduling that encapsulates a packet or other datatype
 * like SW generated event from the CPU, Crypto work completion notification,
 * Timer expiry event notification etc as well as metadata.
 * The metadata includes flow ID, scheduling type, event priority, event_type,
 * sub_event_type etc.
 *
 * Event queue: A queue containing events that are scheduled by the event dev.
 * An event queue contains events of different flows associated with scheduling
 * types, such as atomic, ordered, or parallel.
 *
 * Event port: An application's interface into the event dev for enqueue and
 * dequeue operations. Each event port can be linked with one or more
 * event queues for dequeue operations.
 *
 * By default, all the functions of the Event Device API exported by a PMD
 * are lock-free functions which assume to not be invoked in parallel on
 * different logical cores to work on the same target object. For instance,
 * the dequeue function of a PMD cannot be invoked in parallel on two logical
 * cores to operates on same  event port. Of course, this function
 * can be invoked in parallel by different logical cores on different ports.
 * It is the responsibility of the upper level application to enforce this rule.
 *
 * In all functions of the Event API, the Event device is
 * designated by an integer >= 0 named the device identifier *dev_id*
 *
 * At the Event driver level, Event devices are represented by a generic
 * data structure of type *rte_event_dev*.
 *
 * Event devices are dynamically registered during the PCI/SoC device probing
 * phase performed at EAL initialization time.
 * When an Event device is being probed, a *rte_event_dev* structure and
 * a new device identifier are allocated for that device. Then, the
 * event_dev_init() function supplied by the Event driver matching the probed
 * device is invoked to properly initialize the device.
 *
 * The role of the device init function consists of resetting the hardware or
 * software event driver implementations.
 *
 * If the device init operation is successful, the correspondence between
 * the device identifier assigned to the new device and its associated
 * *rte_event_dev* structure is effectively registered.
 * Otherwise, both the *rte_event_dev* structure and the device identifier are
 * freed.
 *
 * The functions exported by the application Event API to setup a device
 * designated by its device identifier must be invoked in the following order:
 *     - rte_event_dev_configure()
 *     - rte_event_queue_setup()
 *     - rte_event_port_setup()
 *     - rte_event_port_link()
 *     - rte_event_dev_start()
 *
 * Then, the application can invoke, in any order, the functions
 * exported by the Event API to schedule events, dequeue events, enqueue events,
 * change event queue(s) to event port [un]link establishment and so on.
 *
 * Application may use rte_event_[queue/port]_default_conf_get() to get the
 * default configuration to set up an event queue or event port by
 * overriding few default values.
 *
 * If the application wants to change the configuration (i.e. call
 * rte_event_dev_configure(), rte_event_queue_setup(), or
 * rte_event_port_setup()), it must call rte_event_dev_stop() first to stop the
 * device and then do the reconfiguration before calling rte_event_dev_start()
 * again. The schedule, enqueue and dequeue functions should not be invoked
 * when the device is stopped.
 *
 * Finally, an application can close an Event device by invoking the
 * rte_event_dev_close() function.
 *
 * Each function of the application Event API invokes a specific function
 * of the PMD that controls the target device designated by its device
 * identifier.
 *
 * For this purpose, all device-specific functions of an Event driver are
 * supplied through a set of pointers contained in a generic structure of type
 * *event_dev_ops*.
 * The address of the *event_dev_ops* structure is stored in the *rte_event_dev*
 * structure by the device init function of the Event driver, which is
 * invoked during the PCI/SoC device probing phase, as explained earlier.
 *
 * In other words, each function of the Event API simply retrieves the
 * *rte_event_dev* structure associated with the device identifier and
 * performs an indirect invocation of the corresponding driver function
 * supplied in the *event_dev_ops* structure of the *rte_event_dev* structure.
 *
 * For performance reasons, the address of the fast-path functions of the
 * Event driver is not contained in the *event_dev_ops* structure.
 * Instead, they are directly stored at the beginning of the *rte_event_dev*
 * structure to avoid an extra indirect memory access during their invocation.
 *
 * RTE event device drivers do not use interrupts for enqueue or dequeue
 * operation. Instead, Event drivers export Poll-Mode enqueue and dequeue
 * functions to applications.
 *
 * An event driven based application has following typical workflow on fastpath:
 * \code{.c}
 *	while (1) {
 *
 *		rte_event_schedule(dev_id);
 *
 *		rte_event_dequeue(...);
 *
 *		(event processing)
 *
 *		rte_event_enqueue(...);
 *	}
 * \endcode
 *
 * The events are injected to event device through *enqueue* operation by
 * event producers in the system. The typical event producers are ethdev
 * subsystem for generating packet events, CPU(SW) for generating events based
 * on different stages of application processing, cryptodev for generating
 * crypto work completion notification etc
 *
 * The *dequeue* operation gets one or more events from the event ports.
 * The application process the events and send to downstream event queue through
 * rte_event_enqueue_burst() if it is an intermediate stage of event processing,
 * on the final stage, the application may send to different subsystem like
 * ethdev to send the packet/event on the wire using ethdev
 * rte_eth_tx_burst() API.
 *
 * The point at which events are scheduled to ports depends on the device.
 * For hardware devices, scheduling occurs asynchronously without any software
 * intervention. Software schedulers can either be distributed
 * (each worker thread schedules events to its own port) or centralized
 * (a dedicated thread schedules to all ports). Distributed software schedulers
 * perform the scheduling in rte_event_dequeue_burst(), whereas centralized
 * scheduler logic is located in rte_event_schedule().
 * The RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED capability flag is not set
 * indicates the device is centralized and thus needs a dedicated scheduling
 * thread that repeatedly calls rte_event_schedule().
 *
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_errno.h>

struct rte_mbuf; /* we just use mbuf pointers; no need to include rte_mbuf.h */

/* Event device capability bitmap flags */
#define RTE_EVENT_DEV_CAP_QUEUE_QOS           (1ULL << 0)
/**< Event scheduling prioritization is based on the priority associated with
 *  each event queue.
 *
 *  @see rte_event_queue_setup()
 */
#define RTE_EVENT_DEV_CAP_EVENT_QOS           (1ULL << 1)
/**< Event scheduling prioritization is based on the priority associated with
 *  each event. Priority of each event is supplied in *rte_event* structure
 *  on each enqueue operation.
 *
 *  @see rte_event_enqueue_burst()
 */
#define RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED   (1ULL << 2)
/**< Event device operates in distributed scheduling mode.
 * In distributed scheduling mode, event scheduling happens in HW or
 * rte_event_dequeue_burst() or the combination of these two.
 * If the flag is not set then eventdev is centralized and thus needs a
 * dedicated scheduling thread that repeatedly calls rte_event_schedule().
 *
 * @see rte_event_schedule(), rte_event_dequeue_burst()
 */
#define RTE_EVENT_DEV_CAP_QUEUE_ALL_TYPES     (1ULL << 3)
/**< Event device is capable of enqueuing events of any type to any queue.
 * If this capability is not set, the queue only supports events of the
 *  *RTE_EVENT_QUEUE_CFG_* type that it was created with.
 *
 * @see RTE_EVENT_QUEUE_CFG_* values
 */

/* Event device priority levels */
#define RTE_EVENT_DEV_PRIORITY_HIGHEST   0
/**< Highest priority expressed across eventdev subsystem
 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
 * @see rte_event_port_link()
 */
#define RTE_EVENT_DEV_PRIORITY_NORMAL    128
/**< Normal priority expressed across eventdev subsystem
 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
 * @see rte_event_port_link()
 */
#define RTE_EVENT_DEV_PRIORITY_LOWEST    255
/**< Lowest priority expressed across eventdev subsystem
 * @see rte_event_queue_setup(), rte_event_enqueue_burst()
 * @see rte_event_port_link()
 */

/**
 * Get the total number of event devices that have been successfully
 * initialised.
 *
 * @return
 *   The total number of usable event devices.
 */
uint8_t
rte_event_dev_count(void);

/**
 * Get the device identifier for the named event device.
 *
 * @param name
 *   Event device name to select the event device identifier.
 *
 * @return
 *   Returns event device identifier on success.
 *   - <0: Failure to find named event device.
 */
int
rte_event_dev_get_dev_id(const char *name);

/**
 * Return the NUMA socket to which a device is connected.
 *
 * @param dev_id
 *   The identifier of the device.
 * @return
 *   The NUMA socket id to which the device is connected or
 *   a default of zero if the socket could not be determined.
 *   -(-EINVAL)  dev_id value is out of range.
 */
int
rte_event_dev_socket_id(uint8_t dev_id);

/**
 * Event device information
 */
struct rte_event_dev_info {
	const char *driver_name;	/**< Event driver name */
	struct rte_device *dev;	/**< Device information */
	uint32_t min_dequeue_timeout_ns;
	/**< Minimum supported global dequeue timeout(ns) by this device */
	uint32_t max_dequeue_timeout_ns;
	/**< Maximum supported global dequeue timeout(ns) by this device */
	uint32_t dequeue_timeout_ns;
	/**< Configured global dequeue timeout(ns) for this device */
	uint8_t max_event_queues;
	/**< Maximum event_queues supported by this device */
	uint32_t max_event_queue_flows;
	/**< Maximum supported flows in an event queue by this device*/
	uint8_t max_event_queue_priority_levels;
	/**< Maximum number of event queue priority levels by this device.
	 * Valid when the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability
	 */
	uint8_t max_event_priority_levels;
	/**< Maximum number of event priority levels by this device.
	 * Valid when the device has RTE_EVENT_DEV_CAP_EVENT_QOS capability
	 */
	uint8_t max_event_ports;
	/**< Maximum number of event ports supported by this device */
	uint8_t max_event_port_dequeue_depth;
	/**< Maximum number of events can be dequeued at a time from an
	 * event port by this device.
	 * A device that does not support bulk dequeue will set this as 1.
	 */
	uint32_t max_event_port_enqueue_depth;
	/**< Maximum number of events can be enqueued at a time from an
	 * event port by this device.
	 * A device that does not support bulk enqueue will set this as 1.
	 */
	int32_t max_num_events;
	/**< A *closed system* event dev has a limit on the number of events it
	 * can manage at a time. An *open system* event dev does not have a
	 * limit and will specify this as -1.
	 */
	uint32_t event_dev_cap;
	/**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
};

/**
 * Retrieve the contextual information of an event device.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param[out] dev_info
 *   A pointer to a structure of type *rte_event_dev_info* to be filled with the
 *   contextual information of the device.
 *
 * @return
 *   - 0: Success, driver updates the contextual information of the event device
 *   - <0: Error code returned by the driver info get function.
 *
 */
int
rte_event_dev_info_get(uint8_t dev_id, struct rte_event_dev_info *dev_info);

/* Event device configuration bitmap flags */
#define RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT (1ULL << 0)
/**< Override the global *dequeue_timeout_ns* and use per dequeue timeout in ns.
 *  @see rte_event_dequeue_timeout_ticks(), rte_event_dequeue_burst()
 */

/** Event device configuration structure */
struct rte_event_dev_config {
	uint32_t dequeue_timeout_ns;
	/**< rte_event_dequeue_burst() timeout on this device.
	 * This value should be in the range of *min_dequeue_timeout_ns* and
	 * *max_dequeue_timeout_ns* which previously provided in
	 * rte_event_dev_info_get()
	 * @see RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
	 */
	int32_t nb_events_limit;
	/**< In a *closed system* this field is the limit on maximum number of
	 * events that can be inflight in the eventdev at a given time. The
	 * limit is required to ensure that the finite space in a closed system
	 * is not overwhelmed. The value cannot exceed the *max_num_events*
	 * as provided by rte_event_dev_info_get().
	 * This value should be set to -1 for *open system*.
	 */
	uint8_t nb_event_queues;
	/**< Number of event queues to configure on this device.
	 * This value cannot exceed the *max_event_queues* which previously
	 * provided in rte_event_dev_info_get()
	 */
	uint8_t nb_event_ports;
	/**< Number of event ports to configure on this device.
	 * This value cannot exceed the *max_event_ports* which previously
	 * provided in rte_event_dev_info_get()
	 */
	uint32_t nb_event_queue_flows;
	/**< Number of flows for any event queue on this device.
	 * This value cannot exceed the *max_event_queue_flows* which previously
	 * provided in rte_event_dev_info_get()
	 */
	uint32_t nb_event_port_dequeue_depth;
	/**< Maximum number of events can be dequeued at a time from an
	 * event port by this device.
	 * This value cannot exceed the *max_event_port_dequeue_depth*
	 * which previously provided in rte_event_dev_info_get()
	 * @see rte_event_port_setup()
	 */
	uint32_t nb_event_port_enqueue_depth;
	/**< Maximum number of events can be enqueued at a time from an
	 * event port by this device.
	 * This value cannot exceed the *max_event_port_enqueue_depth*
	 * which previously provided in rte_event_dev_info_get()
	 * @see rte_event_port_setup()
	 */
	uint32_t event_dev_cfg;
	/**< Event device config flags(RTE_EVENT_DEV_CFG_)*/
};

/**
 * Configure an event device.
 *
 * This function must be invoked first before any other function in the
 * API. This function can also be re-invoked when a device is in the
 * stopped state.
 *
 * The caller may use rte_event_dev_info_get() to get the capability of each
 * resources available for this event device.
 *
 * @param dev_id
 *   The identifier of the device to configure.
 * @param dev_conf
 *   The event device configuration structure.
 *
 * @return
 *   - 0: Success, device configured.
 *   - <0: Error code returned by the driver configuration function.
 */
int
rte_event_dev_configure(uint8_t dev_id,
			const struct rte_event_dev_config *dev_conf);


/* Event queue specific APIs */

/* Event queue configuration bitmap flags */
#define RTE_EVENT_QUEUE_CFG_TYPE_MASK          (3ULL << 0)
/**< Mask for event queue schedule type configuration request */
#define RTE_EVENT_QUEUE_CFG_ALL_TYPES          (0ULL << 0)
/**< Allow ATOMIC,ORDERED,PARALLEL schedule type enqueue
 *
 * @see RTE_SCHED_TYPE_ORDERED, RTE_SCHED_TYPE_ATOMIC, RTE_SCHED_TYPE_PARALLEL
 * @see rte_event_enqueue_burst()
 */
#define RTE_EVENT_QUEUE_CFG_ATOMIC_ONLY        (1ULL << 0)
/**< Allow only ATOMIC schedule type enqueue
 *
 * The rte_event_enqueue_burst() result is undefined if the queue configured
 * with ATOMIC only and sched_type != RTE_SCHED_TYPE_ATOMIC
 *
 * @see RTE_SCHED_TYPE_ATOMIC, rte_event_enqueue_burst()
 */
#define RTE_EVENT_QUEUE_CFG_ORDERED_ONLY       (2ULL << 0)
/**< Allow only ORDERED schedule type enqueue
 *
 * The rte_event_enqueue_burst() result is undefined if the queue configured
 * with ORDERED only and sched_type != RTE_SCHED_TYPE_ORDERED
 *
 * @see RTE_SCHED_TYPE_ORDERED, rte_event_enqueue_burst()
 */
#define RTE_EVENT_QUEUE_CFG_PARALLEL_ONLY      (3ULL << 0)
/**< Allow only PARALLEL schedule type enqueue
 *
 * The rte_event_enqueue_burst() result is undefined if the queue configured
 * with PARALLEL only and sched_type != RTE_SCHED_TYPE_PARALLEL
 *
 * @see RTE_SCHED_TYPE_PARALLEL, rte_event_enqueue_burst()
 */
#define RTE_EVENT_QUEUE_CFG_SINGLE_LINK        (1ULL << 2)
/**< This event queue links only to a single event port.
 *
 *  @see rte_event_port_setup(), rte_event_port_link()
 */

/** Event queue configuration structure */
struct rte_event_queue_conf {
	uint32_t nb_atomic_flows;
	/**< The maximum number of active flows this queue can track at any
	 * given time. The value must be in the range of
	 * [1 - nb_event_queue_flows)] which previously provided in
	 * rte_event_dev_info_get().
	 */
	uint32_t nb_atomic_order_sequences;
	/**< The maximum number of outstanding events waiting to be
	 * reordered by this queue. In other words, the number of entries in
	 * this queue’s reorder buffer.When the number of events in the
	 * reorder buffer reaches to *nb_atomic_order_sequences* then the
	 * scheduler cannot schedule the events from this queue and invalid
	 * event will be returned from dequeue until one or more entries are
	 * freed up/released.
	 * The value must be in the range of [1 - nb_event_queue_flows)]
	 * which previously supplied to rte_event_dev_configure().
	 */
	uint32_t event_queue_cfg; /**< Queue cfg flags(EVENT_QUEUE_CFG_) */
	uint8_t priority;
	/**< Priority for this event queue relative to other event queues.
	 * The requested priority should in the range of
	 * [RTE_EVENT_DEV_PRIORITY_HIGHEST, RTE_EVENT_DEV_PRIORITY_LOWEST].
	 * The implementation shall normalize the requested priority to
	 * event device supported priority value.
	 * Valid when the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability
	 */
};

/**
 * Retrieve the default configuration information of an event queue designated
 * by its *queue_id* from the event driver for an event device.
 *
 * This function intended to be used in conjunction with rte_event_queue_setup()
 * where caller needs to set up the queue by overriding few default values.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param queue_id
 *   The index of the event queue to get the configuration information.
 *   The value must be in the range [0, nb_event_queues - 1]
 *   previously supplied to rte_event_dev_configure().
 * @param[out] queue_conf
 *   The pointer to the default event queue configuration data.
 * @return
 *   - 0: Success, driver updates the default event queue configuration data.
 *   - <0: Error code returned by the driver info get function.
 *
 * @see rte_event_queue_setup()
 *
 */
int
rte_event_queue_default_conf_get(uint8_t dev_id, uint8_t queue_id,
				 struct rte_event_queue_conf *queue_conf);

/**
 * Allocate and set up an event queue for an event device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param queue_id
 *   The index of the event queue to setup. The value must be in the range
 *   [0, nb_event_queues - 1] previously supplied to rte_event_dev_configure().
 * @param queue_conf
 *   The pointer to the configuration data to be used for the event queue.
 *   NULL value is allowed, in which case default configuration	used.
 *
 * @see rte_event_queue_default_conf_get()
 *
 * @return
 *   - 0: Success, event queue correctly set up.
 *   - <0: event queue configuration failed
 */
int
rte_event_queue_setup(uint8_t dev_id, uint8_t queue_id,
		      const struct rte_event_queue_conf *queue_conf);

/**
 * Get the number of event queues on a specific event device
 *
 * @param dev_id
 *   Event device identifier.
 * @return
 *   - The number of configured event queues
 */
uint8_t
rte_event_queue_count(uint8_t dev_id);

/**
 * Get the priority of the event queue on a specific event device
 *
 * @param dev_id
 *   Event device identifier.
 * @param queue_id
 *   Event queue identifier.
 * @return
 *   - If the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability then the
 *    configured priority of the event queue in
 *    [RTE_EVENT_DEV_PRIORITY_HIGHEST, RTE_EVENT_DEV_PRIORITY_LOWEST] range
 *    else the value RTE_EVENT_DEV_PRIORITY_NORMAL
 */
uint8_t
rte_event_queue_priority(uint8_t dev_id, uint8_t queue_id);

/* Event port specific APIs */

/** Event port configuration structure */
struct rte_event_port_conf {
	int32_t new_event_threshold;
	/**< A backpressure threshold for new event enqueues on this port.
	 * Use for *closed system* event dev where event capacity is limited,
	 * and cannot exceed the capacity of the event dev.
	 * Configuring ports with different thresholds can make higher priority
	 * traffic less likely to  be backpressured.
	 * For example, a port used to inject NIC Rx packets into the event dev
	 * can have a lower threshold so as not to overwhelm the device,
	 * while ports used for worker pools can have a higher threshold.
	 * This value cannot exceed the *nb_events_limit*
	 * which was previously supplied to rte_event_dev_configure().
	 * This should be set to '-1' for *open system*.
	 */
	uint16_t dequeue_depth;
	/**< Configure number of bulk dequeues for this event port.
	 * This value cannot exceed the *nb_event_port_dequeue_depth*
	 * which previously supplied to rte_event_dev_configure()
	 */
	uint16_t enqueue_depth;
	/**< Configure number of bulk enqueues for this event port.
	 * This value cannot exceed the *nb_event_port_enqueue_depth*
	 * which previously supplied to rte_event_dev_configure()
	 */
};

/**
 * Retrieve the default configuration information of an event port designated
 * by its *port_id* from the event driver for an event device.
 *
 * This function intended to be used in conjunction with rte_event_port_setup()
 * where caller needs to set up the port by overriding few default values.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param port_id
 *   The index of the event port to get the configuration information.
 *   The value must be in the range [0, nb_event_ports - 1]
 *   previously supplied to rte_event_dev_configure().
 * @param[out] port_conf
 *   The pointer to the default event port configuration data
 * @return
 *   - 0: Success, driver updates the default event port configuration data.
 *   - <0: Error code returned by the driver info get function.
 *
 * @see rte_event_port_setup()
 *
 */
int
rte_event_port_default_conf_get(uint8_t dev_id, uint8_t port_id,
				struct rte_event_port_conf *port_conf);

/**
 * Allocate and set up an event port for an event device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param port_id
 *   The index of the event port to setup. The value must be in the range
 *   [0, nb_event_ports - 1] previously supplied to rte_event_dev_configure().
 * @param port_conf
 *   The pointer to the configuration data to be used for the queue.
 *   NULL value is allowed, in which case default configuration	used.
 *
 * @see rte_event_port_default_conf_get()
 *
 * @return
 *   - 0: Success, event port correctly set up.
 *   - <0: Port configuration failed
 *   - (-EDQUOT) Quota exceeded(Application tried to link the queue configured
 *   with RTE_EVENT_QUEUE_CFG_SINGLE_LINK to more than one event ports)
 */
int
rte_event_port_setup(uint8_t dev_id, uint8_t port_id,
		     const struct rte_event_port_conf *port_conf);

/**
 * Get the number of dequeue queue depth configured for event port designated
 * by its *port_id* on a specific event device
 *
 * @param dev_id
 *   Event device identifier.
 * @param port_id
 *   Event port identifier.
 * @return
 *   - The number of configured dequeue queue depth
 *
 * @see rte_event_dequeue_burst()
 */
uint8_t
rte_event_port_dequeue_depth(uint8_t dev_id, uint8_t port_id);

/**
 * Get the number of enqueue queue depth configured for event port designated
 * by its *port_id* on a specific event device
 *
 * @param dev_id
 *   Event device identifier.
 * @param port_id
 *   Event port identifier.
 * @return
 *   - The number of configured enqueue queue depth
 *
 * @see rte_event_enqueue_burst()
 */
uint8_t
rte_event_port_enqueue_depth(uint8_t dev_id, uint8_t port_id);

/**
 * Get the number of ports on a specific event device
 *
 * @param dev_id
 *   Event device identifier.
 * @return
 *   - The number of configured ports
 */
uint8_t
rte_event_port_count(uint8_t dev_id);

/**
 * Start an event device.
 *
 * The device start step is the last one and consists of setting the event
 * queues to start accepting the events and schedules to event ports.
 *
 * On success, all basic functions exported by the API (event enqueue,
 * event dequeue and so on) can be invoked.
 *
 * @param dev_id
 *   Event device identifier
 * @return
 *   - 0: Success, device started.
 *   - -ESTALE : Not all ports of the device are configured
 *   - -ENOLINK: Not all queues are linked, which could lead to deadlock.
 */
int
rte_event_dev_start(uint8_t dev_id);

/**
 * Stop an event device. The device can be restarted with a call to
 * rte_event_dev_start()
 *
 * @param dev_id
 *   Event device identifier.
 */
void
rte_event_dev_stop(uint8_t dev_id);

/**
 * Close an event device. The device cannot be restarted!
 *
 * @param dev_id
 *   Event device identifier
 *
 * @return
 *  - 0 on successfully closing device
 *  - <0 on failure to close device
 *  - (-EAGAIN) if device is busy
 */
int
rte_event_dev_close(uint8_t dev_id);

/* Scheduler type definitions */
#define RTE_SCHED_TYPE_ORDERED          0
/**< Ordered scheduling
 *
 * Events from an ordered flow of an event queue can be scheduled to multiple
 * ports for concurrent processing while maintaining the original event order.
 * This scheme enables the user to achieve high single flow throughput by
 * avoiding SW synchronization for ordering between ports which bound to cores.
 *
 * The source flow ordering from an event queue is maintained when events are
 * enqueued to their destination queue within the same ordered flow context.
 * An event port holds the context until application call
 * rte_event_dequeue_burst() from the same port, which implicitly releases
 * the context.
 * User may allow the scheduler to release the context earlier than that
 * by invoking rte_event_enqueue_burst() with RTE_EVENT_OP_RELEASE operation.
 *
 * Events from the source queue appear in their original order when dequeued
 * from a destination queue.
 * Event ordering is based on the received event(s), but also other
 * (newly allocated or stored) events are ordered when enqueued within the same
 * ordered context. Events not enqueued (e.g. released or stored) within the
 * context are  considered missing from reordering and are skipped at this time
 * (but can be ordered again within another context).
 *
 * @see rte_event_queue_setup(), rte_event_dequeue_burst(), RTE_EVENT_OP_RELEASE
 */

#define RTE_SCHED_TYPE_ATOMIC           1
/**< Atomic scheduling
 *
 * Events from an atomic flow of an event queue can be scheduled only to a
 * single port at a time. The port is guaranteed to have exclusive (atomic)
 * access to the associated flow context, which enables the user to avoid SW
 * synchronization. Atomic flows also help to maintain event ordering
 * since only one port at a time can process events from a flow of an
 * event queue.
 *
 * The atomic queue synchronization context is dedicated to the port until
 * application call rte_event_dequeue_burst() from the same port,
 * which implicitly releases the context. User may allow the scheduler to
 * release the context earlier than that by invoking rte_event_enqueue_burst()
 * with RTE_EVENT_OP_RELEASE operation.
 *
 * @see rte_event_queue_setup(), rte_event_dequeue_burst(), RTE_EVENT_OP_RELEASE
 */

#define RTE_SCHED_TYPE_PARALLEL         2
/**< Parallel scheduling
 *
 * The scheduler performs priority scheduling, load balancing, etc. functions
 * but does not provide additional event synchronization or ordering.
 * It is free to schedule events from a single parallel flow of an event queue
 * to multiple events ports for concurrent processing.
 * The application is responsible for flow context synchronization and
 * event ordering (SW synchronization).
 *
 * @see rte_event_queue_setup(), rte_event_dequeue_burst()
 */

/* Event types to classify the event source */
#define RTE_EVENT_TYPE_ETHDEV           0x0
/**< The event generated from ethdev subsystem */
#define RTE_EVENT_TYPE_CRYPTODEV        0x1
/**< The event generated from crypodev subsystem */
#define RTE_EVENT_TYPE_TIMERDEV         0x2
/**< The event generated from timerdev subsystem */
#define RTE_EVENT_TYPE_CPU              0x3
/**< The event generated from cpu for pipelining.
 * Application may use *sub_event_type* to further classify the event
 */
#define RTE_EVENT_TYPE_MAX              0x10
/**< Maximum number of event types */

/* Event enqueue operations */
#define RTE_EVENT_OP_NEW                0
/**< The event producers use this operation to inject a new event to the
 * event device.
 */
#define RTE_EVENT_OP_FORWARD            1
/**< The CPU use this operation to forward the event to different event queue or
 * change to new application specific flow or schedule type to enable
 * pipelining
 */
#define RTE_EVENT_OP_RELEASE            2
/**< Release the flow context associated with the schedule type.
 *
 * If current flow's scheduler type method is *RTE_SCHED_TYPE_ATOMIC*
 * then this function hints the scheduler that the user has completed critical
 * section processing in the current atomic context.
 * The scheduler is now allowed to schedule events from the same flow from
 * an event queue to another port. However, the context may be still held
 * until the next rte_event_dequeue_burst() call, this call allows but does not
 * force the scheduler to release the context early.
 *
 * Early atomic context release may increase parallelism and thus system
 * performance, but the user needs to design carefully the split into critical
 * vs non-critical sections.
 *
 * If current flow's scheduler type method is *RTE_SCHED_TYPE_ORDERED*
 * then this function hints the scheduler that the user has done all that need
 * to maintain event order in the current ordered context.
 * The scheduler is allowed to release the ordered context of this port and
 * avoid reordering any following enqueues.
 *
 * Early ordered context release may increase parallelism and thus system
 * performance.
 *
 * If current flow's scheduler type method is *RTE_SCHED_TYPE_PARALLEL*
 * or no scheduling context is held then this function may be an NOOP,
 * depending on the implementation.
 *
 */

/**
 * The generic *rte_event* structure to hold the event attributes
 * for dequeue and enqueue operation
 */
RTE_STD_C11
struct rte_event {
	/** WORD0 */
	union {
		uint64_t event;
		/** Event attributes for dequeue or enqueue operation */
		struct {
			uint32_t flow_id:20;
			/**< Targeted flow identifier for the enqueue and
			 * dequeue operation.
			 * The value must be in the range of
			 * [0, nb_event_queue_flows - 1] which
			 * previously supplied to rte_event_dev_configure().
			 */
			uint32_t sub_event_type:8;
			/**< Sub-event types based on the event source.
			 * @see RTE_EVENT_TYPE_CPU
			 */
			uint32_t event_type:4;
			/**< Event type to classify the event source.
			 * @see RTE_EVENT_TYPE_ETHDEV, (RTE_EVENT_TYPE_*)
			 */
			uint8_t op:2;
			/**< The type of event enqueue operation - new/forward/
			 * etc.This field is not preserved across an instance
			 * and is undefined on dequeue.
			 * @see RTE_EVENT_OP_NEW, (RTE_EVENT_OP_*)
			 */
			uint8_t rsvd:4;
			/**< Reserved for future use */
			uint8_t sched_type:2;
			/**< Scheduler synchronization type (RTE_SCHED_TYPE_*)
			 * associated with flow id on a given event queue
			 * for the enqueue and dequeue operation.
			 */
			uint8_t queue_id;
			/**< Targeted event queue identifier for the enqueue or
			 * dequeue operation.
			 * The value must be in the range of
			 * [0, nb_event_queues - 1] which previously supplied to
			 * rte_event_dev_configure().
			 */
			uint8_t priority;
			/**< Event priority relative to other events in the
			 * event queue. The requested priority should in the
			 * range of  [RTE_EVENT_DEV_PRIORITY_HIGHEST,
			 * RTE_EVENT_DEV_PRIORITY_LOWEST].
			 * The implementation shall normalize the requested
			 * priority to supported priority value.
			 * Valid when the device has
			 * RTE_EVENT_DEV_CAP_EVENT_QOS capability.
			 */
			uint8_t impl_opaque;
			/**< Implementation specific opaque value.
			 * An implementation may use this field to hold
			 * implementation specific value to share between
			 * dequeue and enqueue operation.
			 * The application should not modify this field.
			 */
		};
	};
	/** WORD1 */
	union {
		uint64_t u64;
		/**< Opaque 64-bit value */
		void *event_ptr;
		/**< Opaque event pointer */
		struct rte_mbuf *mbuf;
		/**< mbuf pointer if dequeued event is associated with mbuf */
	};
};


struct rte_eventdev_driver;
struct rte_eventdev_ops;
struct rte_eventdev;

typedef void (*event_schedule_t)(struct rte_eventdev *dev);
/**< @internal Schedule one or more events in the event dev. */

typedef uint16_t (*event_enqueue_t)(void *port, const struct rte_event *ev);
/**< @internal Enqueue event on port of a device */

typedef uint16_t (*event_enqueue_burst_t)(void *port,
			const struct rte_event ev[], uint16_t nb_events);
/**< @internal Enqueue burst of events on port of a device */

typedef uint16_t (*event_dequeue_t)(void *port, struct rte_event *ev,
		uint64_t timeout_ticks);
/**< @internal Dequeue event from port of a device */

typedef uint16_t (*event_dequeue_burst_t)(void *port, struct rte_event ev[],
		uint16_t nb_events, uint64_t timeout_ticks);
/**< @internal Dequeue burst of events from port of a device */

#define RTE_EVENTDEV_NAME_MAX_LEN	(64)
/**< @internal Max length of name of event PMD */

/**
 * @internal
 * The data part, with no function pointers, associated with each device.
 *
 * This structure is safe to place in shared memory to be common among
 * different processes in a multi-process configuration.
 */
struct rte_eventdev_data {
	int socket_id;
	/**< Socket ID where memory is allocated */
	uint8_t dev_id;
	/**< Device ID for this instance */
	uint8_t nb_queues;
	/**< Number of event queues. */
	uint8_t nb_ports;
	/**< Number of event ports. */
	void **ports;
	/**< Array of pointers to ports. */
	uint8_t *ports_dequeue_depth;
	/**< Array of port dequeue depth. */
	uint8_t *ports_enqueue_depth;
	/**< Array of port enqueue depth. */
	uint8_t *queues_prio;
	/**< Array of queue priority. */
	uint16_t *links_map;
	/**< Memory to store queues to port connections. */
	void *dev_private;
	/**< PMD-specific private data */
	uint32_t event_dev_cap;
	/**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
	struct rte_event_dev_config dev_conf;
	/**< Configuration applied to device. */

	RTE_STD_C11
	uint8_t dev_started : 1;
	/**< Device state: STARTED(1)/STOPPED(0) */

	char name[RTE_EVENTDEV_NAME_MAX_LEN];
	/**< Unique identifier name */
} __rte_cache_aligned;

/** @internal The data structure associated with each event device. */
struct rte_eventdev {
	event_schedule_t schedule;
	/**< Pointer to PMD schedule function. */
	event_enqueue_t enqueue;
	/**< Pointer to PMD enqueue function. */
	event_enqueue_burst_t enqueue_burst;
	/**< Pointer to PMD enqueue burst function. */
	event_dequeue_t dequeue;
	/**< Pointer to PMD dequeue function. */
	event_dequeue_burst_t dequeue_burst;
	/**< Pointer to PMD dequeue burst function. */

	struct rte_eventdev_data *data;
	/**< Pointer to device data */
	const struct rte_eventdev_ops *dev_ops;
	/**< Functions exported by PMD */
	struct rte_device *dev;
	/**< Device info. supplied by probing */
	const struct rte_eventdev_driver *driver;
	/**< Driver for this device */

	RTE_STD_C11
	uint8_t attached : 1;
	/**< Flag indicating the device is attached */
} __rte_cache_aligned;

extern struct rte_eventdev *rte_eventdevs;
/** @internal The pool of rte_eventdev structures. */


/**
 * Schedule one or more events in the event dev.
 *
 * An event dev implementation may define this is a NOOP, for instance if
 * the event dev performs its scheduling in hardware.
 *
 * @param dev_id
 *   The identifier of the device.
 */
static inline void
rte_event_schedule(uint8_t dev_id)
{
	struct rte_eventdev *dev = &rte_eventdevs[dev_id];
	if (*dev->schedule)
		(*dev->schedule)(dev);
}

/**
 * Enqueue a burst of events objects or an event object supplied in *rte_event*
 * structure on an  event device designated by its *dev_id* through the event
 * port specified by *port_id*. Each event object specifies the event queue on
 * which it will be enqueued.
 *
 * The *nb_events* parameter is the number of event objects to enqueue which are
 * supplied in the *ev* array of *rte_event* structure.
 *
 * The rte_event_enqueue_burst() function returns the number of
 * events objects it actually enqueued. A return value equal to *nb_events*
 * means that all event objects have been enqueued.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param port_id
 *   The identifier of the event port.
 * @param ev
 *   Points to an array of *nb_events* objects of type *rte_event* structure
 *   which contain the event object enqueue operations to be processed.
 * @param nb_events
 *   The number of event objects to enqueue, typically number of
 *   rte_event_port_enqueue_depth() available for this port.
 *
 * @return
 *   The number of event objects actually enqueued on the event device. The
 *   return value can be less than the value of the *nb_events* parameter when
 *   the event devices queue is full or if invalid parameters are specified in a
 *   *rte_event*. If the return value is less than *nb_events*, the remaining
 *   events at the end of ev[] are not consumed and the caller has to take care
 *   of them, and rte_errno is set accordingly. Possible errno values include:
 *   - -EINVAL  The port ID is invalid, device ID is invalid, an event's queue
 *              ID is invalid, or an event's sched type doesn't match the
 *              capabilities of the destination queue.
 *   - -ENOSPC  The event port was backpressured and unable to enqueue
 *              one or more events. This error code is only applicable to
 *              closed systems.
 * @see rte_event_port_enqueue_depth()
 */
static inline uint16_t
rte_event_enqueue_burst(uint8_t dev_id, uint8_t port_id,
			const struct rte_event ev[], uint16_t nb_events)
{
	struct rte_eventdev *dev = &rte_eventdevs[dev_id];

#ifdef RTE_LIBRTE_EVENTDEV_DEBUG
	if (dev_id >= RTE_EVENT_MAX_DEVS || !rte_eventdevs[dev_id].attached) {
		rte_errno = -EINVAL;
		return 0;
	}

	if (port_id >= dev->data->nb_ports) {
		rte_errno = -EINVAL;
		return 0;
	}
#endif

	/*
	 * Allow zero cost non burst mode routine invocation if application
	 * requests nb_events as const one
	 */
	if (nb_events == 1)
		return (*dev->enqueue)(
			dev->data->ports[port_id], ev);
	else
		return (*dev->enqueue_burst)(
			dev->data->ports[port_id], ev, nb_events);
}

/**
 * Converts nanoseconds to *timeout_ticks* value for rte_event_dequeue_burst()
 *
 * If the device is configured with RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT flag
 * then application can use this function to convert timeout value in
 * nanoseconds to implementations specific timeout value supplied in
 * rte_event_dequeue_burst()
 *
 * @param dev_id
 *   The identifier of the device.
 * @param ns
 *   Wait time in nanosecond
 * @param[out] timeout_ticks
 *   Value for the *timeout_ticks* parameter in rte_event_dequeue_burst()
 *
 * @return
 *  - 0 on success.
 *  - -ENOTSUP if the device doesn't support timeouts
 *  - -EINVAL if *dev_id* is invalid or *timeout_ticks* is NULL
 *  - other values < 0 on failure.
 *
 * @see rte_event_dequeue_burst(), RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
 * @see rte_event_dev_configure()
 *
 */
int
rte_event_dequeue_timeout_ticks(uint8_t dev_id, uint64_t ns,
					uint64_t *timeout_ticks);

/**
 * Dequeue a burst of events objects or an event object from the event port
 * designated by its *event_port_id*, on an event device designated
 * by its *dev_id*.
 *
 * rte_event_dequeue_burst() does not dictate the specifics of scheduling
 * algorithm as each eventdev driver may have different criteria to schedule
 * an event. However, in general, from an application perspective scheduler may
 * use the following scheme to dispatch an event to the port.
 *
 * 1) Selection of event queue based on
 *   a) The list of event queues are linked to the event port.
 *   b) If the device has RTE_EVENT_DEV_CAP_QUEUE_QOS capability then event
 *   queue selection from list is based on event queue priority relative to
 *   other event queue supplied as *priority* in rte_event_queue_setup()
 *   c) If the device has RTE_EVENT_DEV_CAP_EVENT_QOS capability then event
 *   queue selection from the list is based on event priority supplied as
 *   *priority* in rte_event_enqueue_burst()
 * 2) Selection of event
 *   a) The number of flows available in selected event queue.
 *   b) Schedule type method associated with the event
 *
 * The *nb_events* parameter is the maximum number of event objects to dequeue
 * which are returned in the *ev* array of *rte_event* structure.
 *
 * The rte_event_dequeue_burst() function returns the number of events objects
 * it actually dequeued. A return value equal to *nb_events* means that all
 * event objects have been dequeued.
 *
 * The number of events dequeued is the number of scheduler contexts held by
 * this port. These contexts are automatically released in the next
 * rte_event_dequeue_burst() invocation, or invoking rte_event_enqueue_burst()
 * with RTE_EVENT_OP_RELEASE operation can be used to release the
 * contexts early.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param port_id
 *   The identifier of the event port.
 * @param[out] ev
 *   Points to an array of *nb_events* objects of type *rte_event* structure
 *   for output to be populated with the dequeued event objects.
 * @param nb_events
 *   The maximum number of event objects to dequeue, typically number of
 *   rte_event_port_dequeue_depth() available for this port.
 *
 * @param timeout_ticks
 *   - 0 no-wait, returns immediately if there is no event.
 *   - >0 wait for the event, if the device is configured with
 *   RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT then this function will wait until
 *   at least one event is available or *timeout_ticks* time.
 *   if the device is not configured with RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT
 *   then this function will wait until the event available or
 *   *dequeue_timeout_ns* ns which was previously supplied to
 *   rte_event_dev_configure()
 *
 * @return
 * The number of event objects actually dequeued from the port. The return
 * value can be less than the value of the *nb_events* parameter when the
 * event port's queue is not full.
 *
 * @see rte_event_port_dequeue_depth()
 */
static inline uint16_t
rte_event_dequeue_burst(uint8_t dev_id, uint8_t port_id, struct rte_event ev[],
			uint16_t nb_events, uint64_t timeout_ticks)
{
	struct rte_eventdev *dev = &rte_eventdevs[dev_id];

#ifdef RTE_LIBRTE_EVENTDEV_DEBUG
	if (dev_id >= RTE_EVENT_MAX_DEVS || !rte_eventdevs[dev_id].attached) {
		rte_errno = -EINVAL;
		return 0;
	}

	if (port_id >= dev->data->nb_ports) {
		rte_errno = -EINVAL;
		return 0;
	}
#endif

	/*
	 * Allow zero cost non burst mode routine invocation if application
	 * requests nb_events as const one
	 */
	if (nb_events == 1)
		return (*dev->dequeue)(
			dev->data->ports[port_id], ev, timeout_ticks);
	else
		return (*dev->dequeue_burst)(
			dev->data->ports[port_id], ev, nb_events,
				timeout_ticks);
}

/**
 * Link multiple source event queues supplied in *queues* to the destination
 * event port designated by its *port_id* with associated service priority
 * supplied in *priorities* on the event device designated by its *dev_id*.
 *
 * The link establishment shall enable the event port *port_id* from
 * receiving events from the specified event queue(s) supplied in *queues*
 *
 * An event queue may link to one or more event ports.
 * The number of links can be established from an event queue to event port is
 * implementation defined.
 *
 * Event queue(s) to event port link establishment can be changed at runtime
 * without re-configuring the device to support scaling and to reduce the
 * latency of critical work by establishing the link with more event ports
 * at runtime.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param port_id
 *   Event port identifier to select the destination port to link.
 *
 * @param queues
 *   Points to an array of *nb_links* event queues to be linked
 *   to the event port.
 *   NULL value is allowed, in which case this function links all the configured
 *   event queues *nb_event_queues* which previously supplied to
 *   rte_event_dev_configure() to the event port *port_id*
 *
 * @param priorities
 *   Points to an array of *nb_links* service priorities associated with each
 *   event queue link to event port.
 *   The priority defines the event port's servicing priority for
 *   event queue, which may be ignored by an implementation.
 *   The requested priority should in the range of
 *   [RTE_EVENT_DEV_PRIORITY_HIGHEST, RTE_EVENT_DEV_PRIORITY_LOWEST].
 *   The implementation shall normalize the requested priority to
 *   implementation supported priority value.
 *   NULL value is allowed, in which case this function links the event queues
 *   with RTE_EVENT_DEV_PRIORITY_NORMAL servicing priority
 *
 * @param nb_links
 *   The number of links to establish. This parameter is ignored if queues is
 *   NULL.
 *
 * @return
 * The number of links actually established. The return value can be less than
 * the value of the *nb_links* parameter when the implementation has the
 * limitation on specific queue to port link establishment or if invalid
 * parameters are specified in *queues*
 * If the return value is less than *nb_links*, the remaining links at the end
 * of link[] are not established, and the caller has to take care of them.
 * If return value is less than *nb_links* then implementation shall update the
 * rte_errno accordingly, Possible rte_errno values are
 * (-EDQUOT) Quota exceeded(Application tried to link the queue configured with
 *  RTE_EVENT_QUEUE_CFG_SINGLE_LINK to more than one event ports)
 * (-EINVAL) Invalid parameter
 *
 */
int
rte_event_port_link(uint8_t dev_id, uint8_t port_id,
		    const uint8_t queues[], const uint8_t priorities[],
		    uint16_t nb_links);

/**
 * Unlink multiple source event queues supplied in *queues* from the destination
 * event port designated by its *port_id* on the event device designated
 * by its *dev_id*.
 *
 * The unlink establishment shall disable the event port *port_id* from
 * receiving events from the specified event queue *queue_id*
 *
 * Event queue(s) to event port unlink establishment can be changed at runtime
 * without re-configuring the device.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param port_id
 *   Event port identifier to select the destination port to unlink.
 *
 * @param queues
 *   Points to an array of *nb_unlinks* event queues to be unlinked
 *   from the event port.
 *   NULL value is allowed, in which case this function unlinks all the
 *   event queue(s) from the event port *port_id*.
 *
 * @param nb_unlinks
 *   The number of unlinks to establish. This parameter is ignored if queues is
 *   NULL.
 *
 * @return
 * The number of unlinks actually established. The return value can be less
 * than the value of the *nb_unlinks* parameter when the implementation has the
 * limitation on specific queue to port unlink establishment or
 * if invalid parameters are specified.
 * If the return value is less than *nb_unlinks*, the remaining queues at the
 * end of queues[] are not established, and the caller has to take care of them.
 * If return value is less than *nb_unlinks* then implementation shall update
 * the rte_errno accordingly, Possible rte_errno values are
 * (-EINVAL) Invalid parameter
 *
 */
int
rte_event_port_unlink(uint8_t dev_id, uint8_t port_id,
		      uint8_t queues[], uint16_t nb_unlinks);

/**
 * Retrieve the list of source event queues and its associated service priority
 * linked to the destination event port designated by its *port_id*
 * on the event device designated by its *dev_id*.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param port_id
 *   Event port identifier.
 *
 * @param[out] queues
 *   Points to an array of *queues* for output.
 *   The caller has to allocate *RTE_EVENT_MAX_QUEUES_PER_DEV* bytes to
 *   store the event queue(s) linked with event port *port_id*
 *
 * @param[out] priorities
 *   Points to an array of *priorities* for output.
 *   The caller has to allocate *RTE_EVENT_MAX_QUEUES_PER_DEV* bytes to
 *   store the service priority associated with each event queue linked
 *
 * @return
 * The number of links established on the event port designated by its
 *  *port_id*.
 * - <0 on failure.
 *
 */
int
rte_event_port_links_get(uint8_t dev_id, uint8_t port_id,
			 uint8_t queues[], uint8_t priorities[]);

/**
 * Dump internal information about *dev_id* to the FILE* provided in *f*.
 *
 * @param dev_id
 *   The identifier of the device.
 *
 * @param f
 *   A pointer to a file for output
 *
 * @return
 *   - 0: on success
 *   - <0: on failure.
 */
int
rte_event_dev_dump(uint8_t dev_id, FILE *f);

/** Maximum name length for extended statistics counters */
#define RTE_EVENT_DEV_XSTATS_NAME_SIZE 64

/**
 * Selects the component of the eventdev to retrieve statistics from.
 */
enum rte_event_dev_xstats_mode {
	RTE_EVENT_DEV_XSTATS_DEVICE,
	RTE_EVENT_DEV_XSTATS_PORT,
	RTE_EVENT_DEV_XSTATS_QUEUE,
};

/**
 * A name-key lookup element for extended statistics.
 *
 * This structure is used to map between names and ID numbers
 * for extended ethdev statistics.
 */
struct rte_event_dev_xstats_name {
	char name[RTE_EVENT_DEV_XSTATS_NAME_SIZE];
};

/**
 * Retrieve names of extended statistics of an event device.
 *
 * @param dev_id
 *   The identifier of the event device.
 * @param mode
 *   The mode of statistics to retrieve. Choices include the device statistics,
 *   port statistics or queue statistics.
 * @param queue_port_id
 *   Used to specify the port or queue number in queue or port mode, and is
 *   ignored in device mode.
 * @param[out] xstats_names
 *   Block of memory to insert names into. Must be at least size in capacity.
 *   If set to NULL, function returns required capacity.
 * @param[out] ids
 *   Block of memory to insert ids into. Must be at least size in capacity.
 *   If set to NULL, function returns required capacity. The id values returned
 *   can be passed to *rte_event_dev_xstats_get* to select statistics.
 * @param size
 *   Capacity of xstats_names (number of names).
 * @return
 *   - positive value lower or equal to size: success. The return value
 *     is the number of entries filled in the stats table.
 *   - positive value higher than size: error, the given statistics table
 *     is too small. The return value corresponds to the size that should
 *     be given to succeed. The entries in the table are not valid and
 *     shall not be used by the caller.
 *   - negative value on error:
 *        -ENODEV for invalid *dev_id*
 *        -EINVAL for invalid mode, queue port or id parameters
 *        -ENOTSUP if the device doesn't support this function.
 */
int
rte_event_dev_xstats_names_get(uint8_t dev_id,
			       enum rte_event_dev_xstats_mode mode,
			       uint8_t queue_port_id,
			       struct rte_event_dev_xstats_name *xstats_names,
			       unsigned int *ids,
			       unsigned int size);

/**
 * Retrieve extended statistics of an event device.
 *
 * @param dev_id
 *   The identifier of the device.
 * @param mode
 *  The mode of statistics to retrieve. Choices include the device statistics,
 *  port statistics or queue statistics.
 * @param queue_port_id
 *   Used to specify the port or queue number in queue or port mode, and is
 *   ignored in device mode.
 * @param ids
 *   The id numbers of the stats to get. The ids can be got from the stat
 *   position in the stat list from rte_event_dev_get_xstats_names(), or
 *   by using rte_eventdev_get_xstats_by_name()
 * @param[out] values
 *   The values for each stats request by ID.
 * @param n
 *   The number of stats requested
 * @return
 *   - positive value: number of stat entries filled into the values array
 *   - negative value on error:
 *        -ENODEV for invalid *dev_id*
 *        -EINVAL for invalid mode, queue port or id parameters
 *        -ENOTSUP if the device doesn't support this function.
 */
int
rte_event_dev_xstats_get(uint8_t dev_id,
			 enum rte_event_dev_xstats_mode mode,
			 uint8_t queue_port_id,
			 const unsigned int ids[],
			 uint64_t values[], unsigned int n);

/**
 * Retrieve the value of a single stat by requesting it by name.
 *
 * @param dev_id
 *   The identifier of the device
 * @param name
 *   The stat name to retrieve
 * @param[out] id
 *   If non-NULL, the numerical id of the stat will be returned, so that further
 *   requests for the stat can be got using rte_eventdev_xstats_get, which will
 *   be faster as it doesn't need to scan a list of names for the stat.
 *   If the stat cannot be found, the id returned will be (unsigned)-1.
 * @return
 *   - positive value or zero: the stat value
 *   - negative value: -EINVAL if stat not found, -ENOTSUP if not supported.
 */
uint64_t
rte_event_dev_xstats_by_name_get(uint8_t dev_id, const char *name,
				 unsigned int *id);

/**
 * Reset the values of the xstats of the selected component in the device.
 *
 * @param dev_id
 *   The identifier of the device
 * @param mode
 *   The mode of the statistics to reset. Choose from device, queue or port.
 * @param queue_port_id
 *   The queue or port to reset. 0 and positive values select ports and queues,
 *   while -1 indicates all ports or queues.
 * @param ids
 *   Selects specific statistics to be reset. When NULL, all statistics selected
 *   by *mode* will be reset. If non-NULL, must point to array of at least
 *   *nb_ids* size.
 * @param nb_ids
 *   The number of ids available from the *ids* array. Ignored when ids is NULL.
 * @return
 *   - zero: successfully reset the statistics to zero
 *   - negative value: -EINVAL invalid parameters, -ENOTSUP if not supported.
 */
int
rte_event_dev_xstats_reset(uint8_t dev_id,
			   enum rte_event_dev_xstats_mode mode,
			   int16_t queue_port_id,
			   const uint32_t ids[],
			   uint32_t nb_ids);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_EVENTDEV_H_ */