aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/mlx4/qp.c
blob: b5a24fbef70d95768e3bd9a572dff993aa67e854 (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
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <rdma/ib_cache.h>
#include <rdma/ib_pack.h>

#include <linux/mlx4/qp.h>

#include "mlx4_ib.h"
#include "user.h"

enum {
	MLX4_IB_ACK_REQ_FREQ	= 8,
};

enum {
	MLX4_IB_DEFAULT_SCHED_QUEUE	= 0x83,
	MLX4_IB_DEFAULT_QP0_SCHED_QUEUE	= 0x3f
};

enum {
	/*
	 * Largest possible UD header: send with GRH and immediate data.
	 */
	MLX4_IB_UD_HEADER_SIZE		= 72
};

struct mlx4_ib_sqp {
	struct mlx4_ib_qp	qp;
	int			pkey_index;
	u32			qkey;
	u32			send_psn;
	struct ib_ud_header	ud_header;
	u8			header_buf[MLX4_IB_UD_HEADER_SIZE];
};

static const __be32 mlx4_ib_opcode[] = {
	[IB_WR_SEND]			= __constant_cpu_to_be32(MLX4_OPCODE_SEND),
	[IB_WR_SEND_WITH_IMM]		= __constant_cpu_to_be32(MLX4_OPCODE_SEND_IMM),
	[IB_WR_RDMA_WRITE]		= __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
	[IB_WR_RDMA_WRITE_WITH_IMM]	= __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
	[IB_WR_RDMA_READ]		= __constant_cpu_to_be32(MLX4_OPCODE_RDMA_READ),
	[IB_WR_ATOMIC_CMP_AND_SWP]	= __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
	[IB_WR_ATOMIC_FETCH_AND_ADD]	= __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
};

static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
{
	return container_of(mqp, struct mlx4_ib_sqp, qp);
}

static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
{
	return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
		qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
}

static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
{
	return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
		qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
}

static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
{
	if (qp->buf.nbufs == 1)
		return qp->buf.u.direct.buf + offset;
	else
		return qp->buf.u.page_list[offset >> PAGE_SHIFT].buf +
			(offset & (PAGE_SIZE - 1));
}

static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
{
	return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
}

static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
{
	return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
}

/*
 * Stamp a SQ WQE so that it is invalid if prefetched by marking the
 * first four bytes of every 64 byte chunk with 0xffffffff, except for
 * the very first chunk of the WQE.
 */
static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n)
{
	u32 *wqe = get_send_wqe(qp, n);
	int i;

	for (i = 16; i < 1 << (qp->sq.wqe_shift - 2); i += 16)
		wqe[i] = 0xffffffff;
}

static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
{
	struct ib_event event;
	struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;

	if (type == MLX4_EVENT_TYPE_PATH_MIG)
		to_mibqp(qp)->port = to_mibqp(qp)->alt_port;

	if (ibqp->event_handler) {
		event.device     = ibqp->device;
		event.element.qp = ibqp;
		switch (type) {
		case MLX4_EVENT_TYPE_PATH_MIG:
			event.event = IB_EVENT_PATH_MIG;
			break;
		case MLX4_EVENT_TYPE_COMM_EST:
			event.event = IB_EVENT_COMM_EST;
			break;
		case MLX4_EVENT_TYPE_SQ_DRAINED:
			event.event = IB_EVENT_SQ_DRAINED;
			break;
		case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
			event.event = IB_EVENT_QP_LAST_WQE_REACHED;
			break;
		case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
			event.event = IB_EVENT_QP_FATAL;
			break;
		case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
			event.event = IB_EVENT_PATH_MIG_ERR;
			break;
		case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
			event.event = IB_EVENT_QP_REQ_ERR;
			break;
		case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
			event.event = IB_EVENT_QP_ACCESS_ERR;
			break;
		default:
			printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
			       "on QP %06x\n", type, qp->qpn);
			return;
		}

		ibqp->event_handler(&event, ibqp->qp_context);
	}
}

static int send_wqe_overhead(enum ib_qp_type type)
{
	/*
	 * UD WQEs must have a datagram segment.
	 * RC and UC WQEs might have a remote address segment.
	 * MLX WQEs need two extra inline data segments (for the UD
	 * header and space for the ICRC).
	 */
	switch (type) {
	case IB_QPT_UD:
		return sizeof (struct mlx4_wqe_ctrl_seg) +
			sizeof (struct mlx4_wqe_datagram_seg);
	case IB_QPT_UC:
		return sizeof (struct mlx4_wqe_ctrl_seg) +
			sizeof (struct mlx4_wqe_raddr_seg);
	case IB_QPT_RC:
		return sizeof (struct mlx4_wqe_ctrl_seg) +
			sizeof (struct mlx4_wqe_atomic_seg) +
			sizeof (struct mlx4_wqe_raddr_seg);
	case IB_QPT_SMI:
	case IB_QPT_GSI:
		return sizeof (struct mlx4_wqe_ctrl_seg) +
			ALIGN(MLX4_IB_UD_HEADER_SIZE +
			      DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
					   MLX4_INLINE_ALIGN) *
			      sizeof (struct mlx4_wqe_inline_seg),
			      sizeof (struct mlx4_wqe_data_seg)) +
			ALIGN(4 +
			      sizeof (struct mlx4_wqe_inline_seg),
			      sizeof (struct mlx4_wqe_data_seg));
	default:
		return sizeof (struct mlx4_wqe_ctrl_seg);
	}
}

static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
		       int is_user, int has_srq, struct mlx4_ib_qp *qp)
{
	/* Sanity check RQ size before proceeding */
	if (cap->max_recv_wr  > dev->dev->caps.max_wqes  ||
	    cap->max_recv_sge > dev->dev->caps.max_rq_sg)
		return -EINVAL;

	if (has_srq) {
		/* QPs attached to an SRQ should have no RQ */
		if (cap->max_recv_wr)
			return -EINVAL;

		qp->rq.wqe_cnt = qp->rq.max_gs = 0;
	} else {
		/* HW requires >= 1 RQ entry with >= 1 gather entry */
		if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
			return -EINVAL;

		qp->rq.wqe_cnt	 = roundup_pow_of_two(max(1U, cap->max_recv_wr));
		qp->rq.max_gs	 = roundup_pow_of_two(max(1U, cap->max_recv_sge));
		qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
	}

	cap->max_recv_wr  = qp->rq.max_post = qp->rq.wqe_cnt;
	cap->max_recv_sge = qp->rq.max_gs;

	return 0;
}

static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
			      enum ib_qp_type type, struct mlx4_ib_qp *qp)
{
	/* Sanity check SQ size before proceeding */
	if (cap->max_send_wr	 > dev->dev->caps.max_wqes  ||
	    cap->max_send_sge	 > dev->dev->caps.max_sq_sg ||
	    cap->max_inline_data + send_wqe_overhead(type) +
	    sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
		return -EINVAL;

	/*
	 * For MLX transport we need 2 extra S/G entries:
	 * one for the header and one for the checksum at the end
	 */
	if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
	    cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
		return -EINVAL;

	qp->sq.wqe_shift = ilog2(roundup_pow_of_two(max(cap->max_send_sge *
							sizeof (struct mlx4_wqe_data_seg),
							cap->max_inline_data +
							sizeof (struct mlx4_wqe_inline_seg)) +
						    send_wqe_overhead(type)));
	qp->sq.max_gs    = ((1 << qp->sq.wqe_shift) - send_wqe_overhead(type)) /
		sizeof (struct mlx4_wqe_data_seg);

	/*
	 * We need to leave 2 KB + 1 WQE of headroom in the SQ to
	 * allow HW to prefetch.
	 */
	qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + 1;
	qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr + qp->sq_spare_wqes);

	qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
		(qp->sq.wqe_cnt << qp->sq.wqe_shift);
	if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
		qp->rq.offset = 0;
		qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
	} else {
		qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
		qp->sq.offset = 0;
	}

	cap->max_send_wr  = qp->sq.max_post = qp->sq.wqe_cnt - qp->sq_spare_wqes;
	cap->max_send_sge = qp->sq.max_gs;
	/* We don't support inline sends for kernel QPs (yet) */
	cap->max_inline_data = 0;

	return 0;
}

static int set_user_sq_size(struct mlx4_ib_qp *qp,
			    struct mlx4_ib_create_qp *ucmd)
{
	qp->sq.wqe_cnt   = 1 << ucmd->log_sq_bb_count;
	qp->sq.wqe_shift = ucmd->log_sq_stride;

	qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
		(qp->sq.wqe_cnt << qp->sq.wqe_shift);

	return 0;
}

static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
			    struct ib_qp_init_attr *init_attr,
			    struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
{
	int err;

	mutex_init(&qp->mutex);
	spin_lock_init(&qp->sq.lock);
	spin_lock_init(&qp->rq.lock);

	qp->state	 = IB_QPS_RESET;
	qp->atomic_rd_en = 0;
	qp->resp_depth   = 0;

	qp->rq.head	    = 0;
	qp->rq.tail	    = 0;
	qp->sq.head	    = 0;
	qp->sq.tail	    = 0;

	err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
	if (err)
		goto err;

	if (pd->uobject) {
		struct mlx4_ib_create_qp ucmd;

		if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
			err = -EFAULT;
			goto err;
		}

		qp->sq_no_prefetch = ucmd.sq_no_prefetch;

		err = set_user_sq_size(qp, &ucmd);
		if (err)
			goto err;

		qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
				       qp->buf_size, 0);
		if (IS_ERR(qp->umem)) {
			err = PTR_ERR(qp->umem);
			goto err;
		}

		err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
				    ilog2(qp->umem->page_size), &qp->mtt);
		if (err)
			goto err_buf;

		err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
		if (err)
			goto err_mtt;

		if (!init_attr->srq) {
			err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
						  ucmd.db_addr, &qp->db);
			if (err)
				goto err_mtt;
		}
	} else {
		qp->sq_no_prefetch = 0;

		err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
		if (err)
			goto err;

		if (!init_attr->srq) {
			err = mlx4_ib_db_alloc(dev, &qp->db, 0);
			if (err)
				goto err;

			*qp->db.db = 0;
		}

		if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
			err = -ENOMEM;
			goto err_db;
		}

		err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
				    &qp->mtt);
		if (err)
			goto err_buf;

		err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
		if (err)
			goto err_mtt;

		qp->sq.wrid  = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
		qp->rq.wrid  = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);

		if (!qp->sq.wrid || !qp->rq.wrid) {
			err = -ENOMEM;
			goto err_wrid;
		}
	}

	err = mlx4_qp_alloc(dev->dev, sqpn, &qp->mqp);
	if (err)
		goto err_wrid;

	/*
	 * Hardware wants QPN written in big-endian order (after
	 * shifting) for send doorbell.  Precompute this value to save
	 * a little bit when posting sends.
	 */
	qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);

	if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
		qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
	else
		qp->sq_signal_bits = 0;

	qp->mqp.event = mlx4_ib_qp_event;

	return 0;

err_wrid:
	if (pd->uobject && !init_attr->srq)
		mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &qp->db);
	else {
		kfree(qp->sq.wrid);
		kfree(qp->rq.wrid);
	}

err_mtt:
	mlx4_mtt_cleanup(dev->dev, &qp->mtt);

err_buf:
	if (pd->uobject)
		ib_umem_release(qp->umem);
	else
		mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);

err_db:
	if (!pd->uobject && !init_attr->srq)
		mlx4_ib_db_free(dev, &qp->db);

err:
	return err;
}

static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
{
	switch (state) {
	case IB_QPS_RESET:	return MLX4_QP_STATE_RST;
	case IB_QPS_INIT:	return MLX4_QP_STATE_INIT;
	case IB_QPS_RTR:	return MLX4_QP_STATE_RTR;
	case IB_QPS_RTS:	return MLX4_QP_STATE_RTS;
	case IB_QPS_SQD:	return MLX4_QP_STATE_SQD;
	case IB_QPS_SQE:	return MLX4_QP_STATE_SQER;
	case IB_QPS_ERR:	return MLX4_QP_STATE_ERR;
	default:		return -1;
	}
}

static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
{
	if (send_cq == recv_cq)
		spin_lock_irq(&send_cq->lock);
	else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
		spin_lock_irq(&send_cq->lock);
		spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
	} else {
		spin_lock_irq(&recv_cq->lock);
		spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
	}
}

static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
{
	if (send_cq == recv_cq)
		spin_unlock_irq(&send_cq->lock);
	else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
		spin_unlock(&recv_cq->lock);
		spin_unlock_irq(&send_cq->lock);
	} else {
		spin_unlock(&send_cq->lock);
		spin_unlock_irq(&recv_cq->lock);
	}
}

static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
			      int is_user)
{
	struct mlx4_ib_cq *send_cq, *recv_cq;

	if (qp->state != IB_QPS_RESET)
		if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
				   MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
			printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
			       qp->mqp.qpn);

	send_cq = to_mcq(qp->ibqp.send_cq);
	recv_cq = to_mcq(qp->ibqp.recv_cq);

	mlx4_ib_lock_cqs(send_cq, recv_cq);

	if (!is_user) {
		__mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
				 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
		if (send_cq != recv_cq)
			__mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
	}

	mlx4_qp_remove(dev->dev, &qp->mqp);

	mlx4_ib_unlock_cqs(send_cq, recv_cq);

	mlx4_qp_free(dev->dev, &qp->mqp);
	mlx4_mtt_cleanup(dev->dev, &qp->mtt);

	if (is_user) {
		if (!qp->ibqp.srq)
			mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
					      &qp->db);
		ib_umem_release(qp->umem);
	} else {
		kfree(qp->sq.wrid);
		kfree(qp->rq.wrid);
		mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
		if (!qp->ibqp.srq)
			mlx4_ib_db_free(dev, &qp->db);
	}
}

struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
				struct ib_qp_init_attr *init_attr,
				struct ib_udata *udata)
{
	struct mlx4_ib_dev *dev = to_mdev(pd->device);
	struct mlx4_ib_sqp *sqp;
	struct mlx4_ib_qp *qp;
	int err;

	switch (init_attr->qp_type) {
	case IB_QPT_RC:
	case IB_QPT_UC:
	case IB_QPT_UD:
	{
		qp = kmalloc(sizeof *qp, GFP_KERNEL);
		if (!qp)
			return ERR_PTR(-ENOMEM);

		err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
		if (err) {
			kfree(qp);
			return ERR_PTR(err);
		}

		qp->ibqp.qp_num = qp->mqp.qpn;

		break;
	}
	case IB_QPT_SMI:
	case IB_QPT_GSI:
	{
		/* Userspace is not allowed to create special QPs: */
		if (pd->uobject)
			return ERR_PTR(-EINVAL);

		sqp = kmalloc(sizeof *sqp, GFP_KERNEL);
		if (!sqp)
			return ERR_PTR(-ENOMEM);

		qp = &sqp->qp;

		err = create_qp_common(dev, pd, init_attr, udata,
				       dev->dev->caps.sqp_start +
				       (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
				       init_attr->port_num - 1,
				       qp);
		if (err) {
			kfree(sqp);
			return ERR_PTR(err);
		}

		qp->port	= init_attr->port_num;
		qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;

		break;
	}
	default:
		/* Don't support raw QPs */
		return ERR_PTR(-EINVAL);
	}

	return &qp->ibqp;
}

int mlx4_ib_destroy_qp(struct ib_qp *qp)
{
	struct mlx4_ib_dev *dev = to_mdev(qp->device);
	struct mlx4_ib_qp *mqp = to_mqp(qp);

	if (is_qp0(dev, mqp))
		mlx4_CLOSE_PORT(dev->dev, mqp->port);

	destroy_qp_common(dev, mqp, !!qp->pd->uobject);

	if (is_sqp(dev, mqp))
		kfree(to_msqp(mqp));
	else
		kfree(mqp);

	return 0;
}

static int to_mlx4_st(enum ib_qp_type type)
{
	switch (type) {
	case IB_QPT_RC:		return MLX4_QP_ST_RC;
	case IB_QPT_UC:		return MLX4_QP_ST_UC;
	case IB_QPT_UD:		return MLX4_QP_ST_UD;
	case IB_QPT_SMI:
	case IB_QPT_GSI:	return MLX4_QP_ST_MLX;
	default:		return -1;
	}
}

static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
				   int attr_mask)
{
	u8 dest_rd_atomic;
	u32 access_flags;
	u32 hw_access_flags = 0;

	if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
		dest_rd_atomic = attr->max_dest_rd_atomic;
	else
		dest_rd_atomic = qp->resp_depth;

	if (attr_mask & IB_QP_ACCESS_FLAGS)
		access_flags = attr->qp_access_flags;
	else
		access_flags = qp->atomic_rd_en;

	if (!dest_rd_atomic)
		access_flags &= IB_ACCESS_REMOTE_WRITE;

	if (access_flags & IB_ACCESS_REMOTE_READ)
		hw_access_flags |= MLX4_QP_BIT_RRE;
	if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
		hw_access_flags |= MLX4_QP_BIT_RAE;
	if (access_flags & IB_ACCESS_REMOTE_WRITE)
		hw_access_flags |= MLX4_QP_BIT_RWE;

	return cpu_to_be32(hw_access_flags);
}

static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
			    int attr_mask)
{
	if (attr_mask & IB_QP_PKEY_INDEX)
		sqp->pkey_index = attr->pkey_index;
	if (attr_mask & IB_QP_QKEY)
		sqp->qkey = attr->qkey;
	if (attr_mask & IB_QP_SQ_PSN)
		sqp->send_psn = attr->sq_psn;
}

static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
{
	path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
}

static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
			 struct mlx4_qp_path *path, u8 port)
{
	path->grh_mylmc     = ah->src_path_bits & 0x7f;
	path->rlid	    = cpu_to_be16(ah->dlid);
	if (ah->static_rate) {
		path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
		while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
		       !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
			--path->static_rate;
	} else
		path->static_rate = 0;
	path->counter_index = 0xff;

	if (ah->ah_flags & IB_AH_GRH) {
		if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
			printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
			       ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
			return -1;
		}

		path->grh_mylmc |= 1 << 7;
		path->mgid_index = ah->grh.sgid_index;
		path->hop_limit  = ah->grh.hop_limit;
		path->tclass_flowlabel =
			cpu_to_be32((ah->grh.traffic_class << 20) |
				    (ah->grh.flow_label));
		memcpy(path->rgid, ah->grh.dgid.raw, 16);
	}

	path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
		((port - 1) << 6) | ((ah->sl & 0xf) << 2);

	return 0;
}

static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
			       const struct ib_qp_attr *attr, int attr_mask,
			       enum ib_qp_state cur_state, enum ib_qp_state new_state)
{
	struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
	struct mlx4_ib_qp *qp = to_mqp(ibqp);
	struct mlx4_qp_context *context;
	enum mlx4_qp_optpar optpar = 0;
	int sqd_event;
	int err = -EINVAL;

	context = kzalloc(sizeof *context, GFP_KERNEL);
	if (!context)
		return -ENOMEM;

	context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
				     (to_mlx4_st(ibqp->qp_type) << 16));
	context->flags     |= cpu_to_be32(1 << 8); /* DE? */

	if (!(attr_mask & IB_QP_PATH_MIG_STATE))
		context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
	else {
		optpar |= MLX4_QP_OPTPAR_PM_STATE;
		switch (attr->path_mig_state) {
		case IB_MIG_MIGRATED:
			context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
			break;
		case IB_MIG_REARM:
			context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
			break;
		case IB_MIG_ARMED:
			context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
			break;
		}
	}

	if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
	    ibqp->qp_type == IB_QPT_UD)
		context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
	else if (attr_mask & IB_QP_PATH_MTU) {
		if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
			printk(KERN_ERR "path MTU (%u) is invalid\n",
			       attr->path_mtu);
			return -EINVAL;
		}
		context->mtu_msgmax = (attr->path_mtu << 5) | 31;
	}

	if (qp->rq.wqe_cnt)
		context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
	context->rq_size_stride |= qp->rq.wqe_shift - 4;

	if (qp->sq.wqe_cnt)
		context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
	context->sq_size_stride |= qp->sq.wqe_shift - 4;

	if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
		context->sq_size_stride |= !!qp->sq_no_prefetch << 7;

	if (qp->ibqp.uobject)
		context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
	else
		context->usr_page = cpu_to_be32(dev->priv_uar.index);

	if (attr_mask & IB_QP_DEST_QPN)
		context->remote_qpn = cpu_to_be32(attr->dest_qp_num);

	if (attr_mask & IB_QP_PORT) {
		if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
		    !(attr_mask & IB_QP_AV)) {
			mlx4_set_sched(&context->pri_path, attr->port_num);
			optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
		}
	}

	if (attr_mask & IB_QP_PKEY_INDEX) {
		context->pri_path.pkey_index = attr->pkey_index;
		optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
	}

	if (attr_mask & IB_QP_AV) {
		if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
				  attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) {
			err = -EINVAL;
			goto out;
		}

		optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
			   MLX4_QP_OPTPAR_SCHED_QUEUE);
	}

	if (attr_mask & IB_QP_TIMEOUT) {
		context->pri_path.ackto = attr->timeout << 3;
		optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
	}

	if (attr_mask & IB_QP_ALT_PATH) {
		if (attr->alt_port_num == 0 ||
		    attr->alt_port_num > dev->dev->caps.num_ports)
			return -EINVAL;

		if (attr->alt_pkey_index >=
		    dev->dev->caps.pkey_table_len[attr->alt_port_num])
			return -EINVAL;

		if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
				  attr->alt_port_num))
			return -EINVAL;

		context->alt_path.pkey_index = attr->alt_pkey_index;
		context->alt_path.ackto = attr->alt_timeout << 3;
		optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
	}

	context->pd	    = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
	context->params1    = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);

	if (attr_mask & IB_QP_RNR_RETRY) {
		context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
		optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
	}

	if (attr_mask & IB_QP_RETRY_CNT) {
		context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
		optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
	}

	if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
		if (attr->max_rd_atomic)
			context->params1 |=
				cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
		optpar |= MLX4_QP_OPTPAR_SRA_MAX;
	}

	if (attr_mask & IB_QP_SQ_PSN)
		context->next_send_psn = cpu_to_be32(attr->sq_psn);

	context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);

	if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
		if (attr->max_dest_rd_atomic)
			context->params2 |=
				cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
		optpar |= MLX4_QP_OPTPAR_RRA_MAX;
	}

	if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
		context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
		optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
	}

	if (ibqp->srq)
		context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);

	if (attr_mask & IB_QP_MIN_RNR_TIMER) {
		context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
		optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
	}
	if (attr_mask & IB_QP_RQ_PSN)
		context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);

	context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);

	if (attr_mask & IB_QP_QKEY) {
		context->qkey = cpu_to_be32(attr->qkey);
		optpar |= MLX4_QP_OPTPAR_Q_KEY;
	}

	if (ibqp->srq)
		context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);

	if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
		context->db_rec_addr = cpu_to_be64(qp->db.dma);

	if (cur_state == IB_QPS_INIT &&
	    new_state == IB_QPS_RTR  &&
	    (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
	     ibqp->qp_type == IB_QPT_UD)) {
		context->pri_path.sched_queue = (qp->port - 1) << 6;
		if (is_qp0(dev, qp))
			context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
		else
			context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
	}

	if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD	&&
	    attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
		sqd_event = 1;
	else
		sqd_event = 0;

	/*
	 * Before passing a kernel QP to the HW, make sure that the
	 * ownership bits of the send queue are set and the SQ
	 * headroom is stamped so that the hardware doesn't start
	 * processing stale work requests.
	 */
	if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
		struct mlx4_wqe_ctrl_seg *ctrl;
		int i;

		for (i = 0; i < qp->sq.wqe_cnt; ++i) {
			ctrl = get_send_wqe(qp, i);
			ctrl->owner_opcode = cpu_to_be32(1 << 31);

			stamp_send_wqe(qp, i);
		}
	}

	err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
			     to_mlx4_state(new_state), context, optpar,
			     sqd_event, &qp->mqp);
	if (err)
		goto out;

	qp->state = new_state;

	if (attr_mask & IB_QP_ACCESS_FLAGS)
		qp->atomic_rd_en = attr->qp_access_flags;
	if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
		qp->resp_depth = attr->max_dest_rd_atomic;
	if (attr_mask & IB_QP_PORT)
		qp->port = attr->port_num;
	if (attr_mask & IB_QP_ALT_PATH)
		qp->alt_port = attr->alt_port_num;

	if (is_sqp(dev, qp))
		store_sqp_attrs(to_msqp(qp), attr, attr_mask);

	/*
	 * If we moved QP0 to RTR, bring the IB link up; if we moved
	 * QP0 to RESET or ERROR, bring the link back down.
	 */
	if (is_qp0(dev, qp)) {
		if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
			if (mlx4_INIT_PORT(dev->dev, qp->port))
				printk(KERN_WARNING "INIT_PORT failed for port %d\n",
				       qp->port);

		if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
		    (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
			mlx4_CLOSE_PORT(dev->dev, qp->port);
	}

	/*
	 * If we moved a kernel QP to RESET, clean up all old CQ
	 * entries and reinitialize the QP.
	 */
	if (new_state == IB_QPS_RESET && !ibqp->uobject) {
		mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
				 ibqp->srq ? to_msrq(ibqp->srq): NULL);
		if (ibqp->send_cq != ibqp->recv_cq)
			mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);

		qp->rq.head = 0;
		qp->rq.tail = 0;
		qp->sq.head = 0;
		qp->sq.tail = 0;
		if (!ibqp->srq)
			*qp->db.db  = 0;
	}

out:
	kfree(context);
	return err;
}

static const struct ib_qp_attr mlx4_ib_qp_attr = { .port_num = 1 };
static const int mlx4_ib_qp_attr_mask_table[IB_QPT_UD + 1] = {
		[IB_QPT_UD]  = (IB_QP_PKEY_INDEX		|
				IB_QP_PORT			|
				IB_QP_QKEY),
		[IB_QPT_UC]  = (IB_QP_PKEY_INDEX		|
				IB_QP_PORT			|
				IB_QP_ACCESS_FLAGS),
		[IB_QPT_RC]  = (IB_QP_PKEY_INDEX		|
				IB_QP_PORT			|
				IB_QP_ACCESS_FLAGS),
		[IB_QPT_SMI] = (IB_QP_PKEY_INDEX		|
				IB_QP_QKEY),
		[IB_QPT_GSI] = (IB_QP_PKEY_INDEX		|
				IB_QP_QKEY),
};

int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
		      int attr_mask, struct ib_udata *udata)
{
	struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
	struct mlx4_ib_qp *qp = to_mqp(ibqp);
	enum ib_qp_state cur_state, new_state;
	int err = -EINVAL;

	mutex_lock(&qp->mutex);

	cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
	new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;

	if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
		goto out;

	if ((attr_mask & IB_QP_PORT) &&
	    (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
		goto out;
	}

	if (attr_mask & IB_QP_PKEY_INDEX) {
		int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
		if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
			goto out;
	}

	if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
	    attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
		goto out;
	}

	if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
	    attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
		goto out;
	}

	if (cur_state == new_state && cur_state == IB_QPS_RESET) {
		err = 0;
		goto out;
	}

	if (cur_state == IB_QPS_RESET && new_state == IB_QPS_ERR) {
		err = __mlx4_ib_modify_qp(ibqp, &mlx4_ib_qp_attr,
					  mlx4_ib_qp_attr_mask_table[ibqp->qp_type],
					  IB_QPS_RESET, IB_QPS_INIT);
		if (err)
			goto out;
		cur_state = IB_QPS_INIT;
	}

	err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);

out:
	mutex_unlock(&qp->mutex);
	return err;
}

static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
			    void *wqe)
{
	struct ib_device *ib_dev = &to_mdev(sqp->qp.ibqp.device)->ib_dev;
	struct mlx4_wqe_mlx_seg *mlx = wqe;
	struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
	struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
	u16 pkey;
	int send_size;
	int header_size;
	int spc;
	int i;

	send_size = 0;
	for (i = 0; i < wr->num_sge; ++i)
		send_size += wr->sg_list[i].length;

	ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), &sqp->ud_header);

	sqp->ud_header.lrh.service_level   =
		be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
	sqp->ud_header.lrh.destination_lid = ah->av.dlid;
	sqp->ud_header.lrh.source_lid      = cpu_to_be16(ah->av.g_slid & 0x7f);
	if (mlx4_ib_ah_grh_present(ah)) {
		sqp->ud_header.grh.traffic_class =
			(be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff;
		sqp->ud_header.grh.flow_label    =
			ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
		sqp->ud_header.grh.hop_limit     = ah->av.hop_limit;
		ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24,
				  ah->av.gid_index, &sqp->ud_header.grh.source_gid);
		memcpy(sqp->ud_header.grh.destination_gid.raw,
		       ah->av.dgid, 16);
	}

	mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
	mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
				  (sqp->ud_header.lrh.destination_lid ==
				   IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
				  (sqp->ud_header.lrh.service_level << 8));
	mlx->rlid   = sqp->ud_header.lrh.destination_lid;

	switch (wr->opcode) {
	case IB_WR_SEND:
		sqp->ud_header.bth.opcode	 = IB_OPCODE_UD_SEND_ONLY;
		sqp->ud_header.immediate_present = 0;
		break;
	case IB_WR_SEND_WITH_IMM:
		sqp->ud_header.bth.opcode	 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
		sqp->ud_header.immediate_present = 1;
		sqp->ud_header.immediate_data    = wr->imm_data;
		break;
	default:
		return -EINVAL;
	}

	sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
	if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
		sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
	sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
	if (!sqp->qp.ibqp.qp_num)
		ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
	else
		ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
	sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
	sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
	sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
	sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
					       sqp->qkey : wr->wr.ud.remote_qkey);
	sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);

	header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);

	if (0) {
		printk(KERN_ERR "built UD header of size %d:\n", header_size);
		for (i = 0; i < header_size / 4; ++i) {
			if (i % 8 == 0)
				printk("  [%02x] ", i * 4);
			printk(" %08x",
			       be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
			if ((i + 1) % 8 == 0)
				printk("\n");
		}
		printk("\n");
	}

	/*
	 * Inline data segments may not cross a 64 byte boundary.  If
	 * our UD header is bigger than the space available up to the
	 * next 64 byte boundary in the WQE, use two inline data
	 * segments to hold the UD header.
	 */
	spc = MLX4_INLINE_ALIGN -
		((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
	if (header_size <= spc) {
		inl->byte_count = cpu_to_be32(1 << 31 | header_size);
		memcpy(inl + 1, sqp->header_buf, header_size);
		i = 1;
	} else {
		inl->byte_count = cpu_to_be32(1 << 31 | spc);
		memcpy(inl + 1, sqp->header_buf, spc);

		inl = (void *) (inl + 1) + spc;
		memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
		/*
		 * Need a barrier here to make sure all the data is
		 * visible before the byte_count field is set.
		 * Otherwise the HCA prefetcher could grab the 64-byte
		 * chunk with this inline segment and get a valid (!=
		 * 0xffffffff) byte count but stale data, and end up
		 * generating a packet with bad headers.
		 *
		 * The first inline segment's byte_count field doesn't
		 * need a barrier, because it comes after a
		 * control/MLX segment and therefore is at an offset
		 * of 16 mod 64.
		 */
		wmb();
		inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
		i = 2;
	}

	return ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
}

static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
{
	unsigned cur;
	struct mlx4_ib_cq *cq;

	cur = wq->head - wq->tail;
	if (likely(cur + nreq < wq->max_post))
		return 0;

	cq = to_mcq(ib_cq);
	spin_lock(&cq->lock);
	cur = wq->head - wq->tail;
	spin_unlock(&cq->lock);

	return cur + nreq >= wq->max_post;
}

static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
					  u64 remote_addr, u32 rkey)
{
	rseg->raddr    = cpu_to_be64(remote_addr);
	rseg->rkey     = cpu_to_be32(rkey);
	rseg->reserved = 0;
}

static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
{
	if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
		aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
		aseg->compare  = cpu_to_be64(wr->wr.atomic.compare_add);
	} else {
		aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
		aseg->compare  = 0;
	}

}

static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
			     struct ib_send_wr *wr)
{
	memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
	dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
	dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);

}

static void set_data_seg(struct mlx4_wqe_data_seg *dseg,
			 struct ib_sge *sg)
{
	dseg->byte_count = cpu_to_be32(sg->length);
	dseg->lkey       = cpu_to_be32(sg->lkey);
	dseg->addr       = cpu_to_be64(sg->addr);
}

int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
		      struct ib_send_wr **bad_wr)
{
	struct mlx4_ib_qp *qp = to_mqp(ibqp);
	void *wqe;
	struct mlx4_wqe_ctrl_seg *ctrl;
	unsigned long flags;
	int nreq;
	int err = 0;
	int ind;
	int size;
	int i;

	spin_lock_irqsave(&qp->rq.lock, flags);

	ind = qp->sq.head;

	for (nreq = 0; wr; ++nreq, wr = wr->next) {
		if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
			err = -ENOMEM;
			*bad_wr = wr;
			goto out;
		}

		if (unlikely(wr->num_sge > qp->sq.max_gs)) {
			err = -EINVAL;
			*bad_wr = wr;
			goto out;
		}

		ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
		qp->sq.wrid[ind & (qp->sq.wqe_cnt - 1)] = wr->wr_id;

		ctrl->srcrb_flags =
			(wr->send_flags & IB_SEND_SIGNALED ?
			 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
			(wr->send_flags & IB_SEND_SOLICITED ?
			 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
			qp->sq_signal_bits;

		if (wr->opcode == IB_WR_SEND_WITH_IMM ||
		    wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
			ctrl->imm = wr->imm_data;
		else
			ctrl->imm = 0;

		wqe += sizeof *ctrl;
		size = sizeof *ctrl / 16;

		switch (ibqp->qp_type) {
		case IB_QPT_RC:
		case IB_QPT_UC:
			switch (wr->opcode) {
			case IB_WR_ATOMIC_CMP_AND_SWP:
			case IB_WR_ATOMIC_FETCH_AND_ADD:
				set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
					      wr->wr.atomic.rkey);
				wqe  += sizeof (struct mlx4_wqe_raddr_seg);

				set_atomic_seg(wqe, wr);
				wqe  += sizeof (struct mlx4_wqe_atomic_seg);

				size += (sizeof (struct mlx4_wqe_raddr_seg) +
					 sizeof (struct mlx4_wqe_atomic_seg)) / 16;

				break;

			case IB_WR_RDMA_READ:
			case IB_WR_RDMA_WRITE:
			case IB_WR_RDMA_WRITE_WITH_IMM:
				set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
					      wr->wr.rdma.rkey);
				wqe  += sizeof (struct mlx4_wqe_raddr_seg);
				size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
				break;

			default:
				/* No extra segments required for sends */
				break;
			}
			break;

		case IB_QPT_UD:
			set_datagram_seg(wqe, wr);
			wqe  += sizeof (struct mlx4_wqe_datagram_seg);
			size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
			break;

		case IB_QPT_SMI:
		case IB_QPT_GSI:
			err = build_mlx_header(to_msqp(qp), wr, ctrl);
			if (err < 0) {
				*bad_wr = wr;
				goto out;
			}
			wqe  += err;
			size += err / 16;

			err = 0;
			break;

		default:
			break;
		}

		for (i = 0; i < wr->num_sge; ++i) {
			set_data_seg(wqe, wr->sg_list + i);

			wqe  += sizeof (struct mlx4_wqe_data_seg);
			size += sizeof (struct mlx4_wqe_data_seg) / 16;
		}

		/* Add one more inline data segment for ICRC for MLX sends */
		if (qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) {
			((struct mlx4_wqe_inline_seg *) wqe)->byte_count =
				cpu_to_be32((1 << 31) | 4);
			((u32 *) wqe)[1] = 0;
			wqe  += sizeof (struct mlx4_wqe_data_seg);
			size += sizeof (struct mlx4_wqe_data_seg) / 16;
		}

		ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
				    MLX4_WQE_CTRL_FENCE : 0) | size;

		/*
		 * Make sure descriptor is fully written before
		 * setting ownership bit (because HW can start
		 * executing as soon as we do).
		 */
		wmb();

		if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
			err = -EINVAL;
			goto out;
		}

		ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
			(ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);

		/*
		 * We can improve latency by not stamping the last
		 * send queue WQE until after ringing the doorbell, so
		 * only stamp here if there are still more WQEs to post.
		 */
		if (wr->next)
			stamp_send_wqe(qp, (ind + qp->sq_spare_wqes) &
				       (qp->sq.wqe_cnt - 1));

		++ind;
	}

out:
	if (likely(nreq)) {
		qp->sq.head += nreq;

		/*
		 * Make sure that descriptors are written before
		 * doorbell record.
		 */
		wmb();

		writel(qp->doorbell_qpn,
		       to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);

		/*
		 * Make sure doorbells don't leak out of SQ spinlock
		 * and reach the HCA out of order.
		 */
		mmiowb();

		stamp_send_wqe(qp, (ind + qp->sq_spare_wqes - 1) &
			       (qp->sq.wqe_cnt - 1));
	}

	spin_unlock_irqrestore(&qp->rq.lock, flags);

	return err;
}

int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
		      struct ib_recv_wr **bad_wr)
{
	struct mlx4_ib_qp *qp = to_mqp(ibqp);
	struct mlx4_wqe_data_seg *scat;
	unsigned long flags;
	int err = 0;
	int nreq;
	int ind;
	int i;

	spin_lock_irqsave(&qp->rq.lock, flags);

	ind = qp->rq.head & (qp->rq.wqe_cnt - 1);

	for (nreq = 0; wr; ++nreq, wr = wr->next) {
		if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.send_cq)) {
			err = -ENOMEM;
			*bad_wr = wr;
			goto out;
		}

		if (unlikely(wr->num_sge > qp->rq.max_gs)) {
			err = -EINVAL;
			*bad_wr = wr;
			goto out;
		}

		scat = get_recv_wqe(qp, ind);

		for (i = 0; i < wr->num_sge; ++i) {
			scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
			scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
			scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
		}

		if (i < qp->rq.max_gs) {
			scat[i].byte_count = 0;
			scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
			scat[i].addr       = 0;
		}

		qp->rq.wrid[ind] = wr->wr_id;

		ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
	}

out:
	if (likely(nreq)) {
		qp->rq.head += nreq;

		/*
		 * Make sure that descriptors are written before
		 * doorbell record.
		 */
		wmb();

		*qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
	}

	spin_unlock_irqrestore(&qp->rq.lock, flags);

	return err;
}

static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
{
	switch (mlx4_state) {
	case MLX4_QP_STATE_RST:      return IB_QPS_RESET;
	case MLX4_QP_STATE_INIT:     return IB_QPS_INIT;
	case MLX4_QP_STATE_RTR:      return IB_QPS_RTR;
	case MLX4_QP_STATE_RTS:      return IB_QPS_RTS;
	case MLX4_QP_STATE_SQ_DRAINING:
	case MLX4_QP_STATE_SQD:      return IB_QPS_SQD;
	case MLX4_QP_STATE_SQER:     return IB_QPS_SQE;
	case MLX4_QP_STATE_ERR:      return IB_QPS_ERR;
	default:		     return -1;
	}
}

static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
{
	switch (mlx4_mig_state) {
	case MLX4_QP_PM_ARMED:		return IB_MIG_ARMED;
	case MLX4_QP_PM_REARM:		return IB_MIG_REARM;
	case MLX4_QP_PM_MIGRATED:	return IB_MIG_MIGRATED;
	default: return -1;
	}
}

static int to_ib_qp_access_flags(int mlx4_flags)
{
	int ib_flags = 0;

	if (mlx4_flags & MLX4_QP_BIT_RRE)
		ib_flags |= IB_ACCESS_REMOTE_READ;
	if (mlx4_flags & MLX4_QP_BIT_RWE)
		ib_flags |= IB_ACCESS_REMOTE_WRITE;
	if (mlx4_flags & MLX4_QP_BIT_RAE)
		ib_flags |= IB_ACCESS_REMOTE_ATOMIC;

	return ib_flags;
}

static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr,
				struct mlx4_qp_path *path)
{
	memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
	ib_ah_attr->port_num	  = path->sched_queue & 0x40 ? 2 : 1;

	if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
		return;

	ib_ah_attr->dlid	  = be16_to_cpu(path->rlid);
	ib_ah_attr->sl		  = (path->sched_queue >> 2) & 0xf;
	ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
	ib_ah_attr->static_rate   = path->static_rate ? path->static_rate - 5 : 0;
	ib_ah_attr->ah_flags      = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
	if (ib_ah_attr->ah_flags) {
		ib_ah_attr->grh.sgid_index = path->mgid_index;
		ib_ah_attr->grh.hop_limit  = path->hop_limit;
		ib_ah_attr->grh.traffic_class =
			(be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
		ib_ah_attr->grh.flow_label =
			be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
		memcpy(ib_ah_attr->grh.dgid.raw,
			path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
	}
}

int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
		     struct ib_qp_init_attr *qp_init_attr)
{
	struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
	struct mlx4_ib_qp *qp = to_mqp(ibqp);
	struct mlx4_qp_context context;
	int mlx4_state;
	int err;

	if (qp->state == IB_QPS_RESET) {
		qp_attr->qp_state = IB_QPS_RESET;
		goto done;
	}

	err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
	if (err)
		return -EINVAL;

	mlx4_state = be32_to_cpu(context.flags) >> 28;

	qp_attr->qp_state	     = to_ib_qp_state(mlx4_state);
	qp_attr->path_mtu	     = context.mtu_msgmax >> 5;
	qp_attr->path_mig_state	     =
		to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
	qp_attr->qkey		     = be32_to_cpu(context.qkey);
	qp_attr->rq_psn		     = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
	qp_attr->sq_psn		     = be32_to_cpu(context.next_send_psn) & 0xffffff;
	qp_attr->dest_qp_num	     = be32_to_cpu(context.remote_qpn) & 0xffffff;
	qp_attr->qp_access_flags     =
		to_ib_qp_access_flags(be32_to_cpu(context.params2));

	if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
		to_ib_ah_attr(dev->dev, &qp_attr->ah_attr, &context.pri_path);
		to_ib_ah_attr(dev->dev, &qp_attr->alt_ah_attr, &context.alt_path);
		qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
		qp_attr->alt_port_num	= qp_attr->alt_ah_attr.port_num;
	}

	qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
	if (qp_attr->qp_state == IB_QPS_INIT)
		qp_attr->port_num = qp->port;
	else
		qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;

	/* qp_attr->en_sqd_async_notify is only applicable in modify qp */
	qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;

	qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);

	qp_attr->max_dest_rd_atomic =
		1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
	qp_attr->min_rnr_timer	    =
		(be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
	qp_attr->timeout	    = context.pri_path.ackto >> 3;
	qp_attr->retry_cnt	    = (be32_to_cpu(context.params1) >> 16) & 0x7;
	qp_attr->rnr_retry	    = (be32_to_cpu(context.params1) >> 13) & 0x7;
	qp_attr->alt_timeout	    = context.alt_path.ackto >> 3;

done:
	qp_attr->cur_qp_state	     = qp_attr->qp_state;
	qp_attr->cap.max_recv_wr     = qp->rq.wqe_cnt;
	qp_attr->cap.max_recv_sge    = qp->rq.max_gs;

	if (!ibqp->uobject) {
		qp_attr->cap.max_send_wr  = qp->sq.wqe_cnt;
		qp_attr->cap.max_send_sge = qp->sq.max_gs;
	} else {
		qp_attr->cap.max_send_wr  = 0;
		qp_attr->cap.max_send_sge = 0;
	}

	/*
	 * We don't support inline sends for kernel QPs (yet), and we
	 * don't know what userspace's value should be.
	 */
	qp_attr->cap.max_inline_data = 0;

	qp_init_attr->cap	     = qp_attr->cap;

	return 0;
}