summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/cxgb4/device.c
blob: 4c0d925c5ff5a85bf6f14ded2b2880f366196a8b (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
/*
 * Copyright (c) 2009-2010 Chelsio, 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 <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
#include <linux/vmalloc.h>
#include <linux/math64.h>

#include <rdma/ib_verbs.h>

#include "iw_cxgb4.h"

#define DRV_VERSION "0.1"

MODULE_AUTHOR("Steve Wise");
MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
MODULE_LICENSE("Dual BSD/GPL");

static int allow_db_fc_on_t5;
module_param(allow_db_fc_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_fc_on_t5,
		 "Allow DB Flow Control on T5 (default = 0)");

static int allow_db_coalescing_on_t5;
module_param(allow_db_coalescing_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_coalescing_on_t5,
		 "Allow DB Coalescing on T5 (default = 0)");

int c4iw_wr_log = 0;
module_param(c4iw_wr_log, int, 0444);
MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");

static int c4iw_wr_log_size_order = 12;
module_param(c4iw_wr_log_size_order, int, 0444);
MODULE_PARM_DESC(c4iw_wr_log_size_order,
		 "Number of entries (log2) in the work request timing log.");

static LIST_HEAD(uld_ctx_list);
static DEFINE_MUTEX(dev_mutex);
static struct workqueue_struct *reg_workq;

#define DB_FC_RESUME_SIZE 64
#define DB_FC_RESUME_DELAY 1
#define DB_FC_DRAIN_THRESH 0

static struct dentry *c4iw_debugfs_root;

struct c4iw_debugfs_data {
	struct c4iw_dev *devp;
	char *buf;
	int bufsize;
	int pos;
};

static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
			    loff_t *ppos)
{
	struct c4iw_debugfs_data *d = file->private_data;

	return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
}

void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
{
	struct wr_log_entry le;
	int idx;

	if (!wq->rdev->wr_log)
		return;

	idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
		(wq->rdev->wr_log_size - 1);
	le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
	le.poll_host_time = ktime_get();
	le.valid = 1;
	le.cqe_sge_ts = CQE_TS(cqe);
	if (SQ_TYPE(cqe)) {
		le.qid = wq->sq.qid;
		le.opcode = CQE_OPCODE(cqe);
		le.post_host_time = wq->sq.sw_sq[wq->sq.cidx].host_time;
		le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
		le.wr_id = CQE_WRID_SQ_IDX(cqe);
	} else {
		le.qid = wq->rq.qid;
		le.opcode = FW_RI_RECEIVE;
		le.post_host_time = wq->rq.sw_rq[wq->rq.cidx].host_time;
		le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
		le.wr_id = CQE_WRID_MSN(cqe);
	}
	wq->rdev->wr_log[idx] = le;
}

static int wr_log_show(struct seq_file *seq, void *v)
{
	struct c4iw_dev *dev = seq->private;
	ktime_t prev_time;
	struct wr_log_entry *lep;
	int prev_time_set = 0;
	int idx, end;

#define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)

	idx = atomic_read(&dev->rdev.wr_log_idx) &
		(dev->rdev.wr_log_size - 1);
	end = idx - 1;
	if (end < 0)
		end = dev->rdev.wr_log_size - 1;
	lep = &dev->rdev.wr_log[idx];
	while (idx != end) {
		if (lep->valid) {
			if (!prev_time_set) {
				prev_time_set = 1;
				prev_time = lep->poll_host_time;
			}
			seq_printf(seq, "%04u: nsec %llu qid %u opcode "
				   "%u %s 0x%x host_wr_delta nsec %llu "
				   "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
				   "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
				   "cqe_poll_delta_ns %llu\n",
				   idx,
				   ktime_to_ns(ktime_sub(lep->poll_host_time,
							 prev_time)),
				   lep->qid, lep->opcode,
				   lep->opcode == FW_RI_RECEIVE ?
							"msn" : "wrid",
				   lep->wr_id,
				   ktime_to_ns(ktime_sub(lep->poll_host_time,
							 lep->post_host_time)),
				   lep->post_sge_ts, lep->cqe_sge_ts,
				   lep->poll_sge_ts,
				   ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
				   ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
			prev_time = lep->poll_host_time;
		}
		idx++;
		if (idx > (dev->rdev.wr_log_size - 1))
			idx = 0;
		lep = &dev->rdev.wr_log[idx];
	}
#undef ts2ns
	return 0;
}

static int wr_log_open(struct inode *inode, struct file *file)
{
	return single_open(file, wr_log_show, inode->i_private);
}

static ssize_t wr_log_clear(struct file *file, const char __user *buf,
			    size_t count, loff_t *pos)
{
	struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
	int i;

	if (dev->rdev.wr_log)
		for (i = 0; i < dev->rdev.wr_log_size; i++)
			dev->rdev.wr_log[i].valid = 0;
	return count;
}

static const struct file_operations wr_log_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = wr_log_open,
	.release = single_release,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.write   = wr_log_clear,
};

static struct sockaddr_in zero_sin = {
	.sin_family = AF_INET,
};

static struct sockaddr_in6 zero_sin6 = {
	.sin6_family = AF_INET6,
};

static void set_ep_sin_addrs(struct c4iw_ep *ep,
			     struct sockaddr_in **lsin,
			     struct sockaddr_in **rsin,
			     struct sockaddr_in **m_lsin,
			     struct sockaddr_in **m_rsin)
{
	struct iw_cm_id *id = ep->com.cm_id;

	*m_lsin = (struct sockaddr_in *)&ep->com.local_addr;
	*m_rsin = (struct sockaddr_in *)&ep->com.remote_addr;
	if (id) {
		*lsin = (struct sockaddr_in *)&id->local_addr;
		*rsin = (struct sockaddr_in *)&id->remote_addr;
	} else {
		*lsin = &zero_sin;
		*rsin = &zero_sin;
	}
}

static void set_ep_sin6_addrs(struct c4iw_ep *ep,
			      struct sockaddr_in6 **lsin6,
			      struct sockaddr_in6 **rsin6,
			      struct sockaddr_in6 **m_lsin6,
			      struct sockaddr_in6 **m_rsin6)
{
	struct iw_cm_id *id = ep->com.cm_id;

	*m_lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
	*m_rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
	if (id) {
		*lsin6 = (struct sockaddr_in6 *)&id->local_addr;
		*rsin6 = (struct sockaddr_in6 *)&id->remote_addr;
	} else {
		*lsin6 = &zero_sin6;
		*rsin6 = &zero_sin6;
	}
}

static int dump_qp(struct c4iw_qp *qp, struct c4iw_debugfs_data *qpd)
{
	int space;
	int cc;

	space = qpd->bufsize - qpd->pos - 1;
	if (space == 0)
		return 1;

	if (qp->ep) {
		struct c4iw_ep *ep = qp->ep;

		if (ep->com.local_addr.ss_family == AF_INET) {
			struct sockaddr_in *lsin;
			struct sockaddr_in *rsin;
			struct sockaddr_in *m_lsin;
			struct sockaddr_in *m_rsin;

			set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
			cc = snprintf(qpd->buf + qpd->pos, space,
				      "rc qp sq id %u %s id %u state %u "
				      "onchip %u ep tid %u state %u "
				      "%pI4:%u/%u->%pI4:%u/%u\n",
				      qp->wq.sq.qid, qp->srq ? "srq" : "rq",
				      qp->srq ? qp->srq->idx : qp->wq.rq.qid,
				      (int)qp->attr.state,
				      qp->wq.sq.flags & T4_SQ_ONCHIP,
				      ep->hwtid, (int)ep->com.state,
				      &lsin->sin_addr, ntohs(lsin->sin_port),
				      ntohs(m_lsin->sin_port),
				      &rsin->sin_addr, ntohs(rsin->sin_port),
				      ntohs(m_rsin->sin_port));
		} else {
			struct sockaddr_in6 *lsin6;
			struct sockaddr_in6 *rsin6;
			struct sockaddr_in6 *m_lsin6;
			struct sockaddr_in6 *m_rsin6;

			set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
					  &m_rsin6);
			cc = snprintf(qpd->buf + qpd->pos, space,
				      "rc qp sq id %u rq id %u state %u "
				      "onchip %u ep tid %u state %u "
				      "%pI6:%u/%u->%pI6:%u/%u\n",
				      qp->wq.sq.qid, qp->wq.rq.qid,
				      (int)qp->attr.state,
				      qp->wq.sq.flags & T4_SQ_ONCHIP,
				      ep->hwtid, (int)ep->com.state,
				      &lsin6->sin6_addr,
				      ntohs(lsin6->sin6_port),
				      ntohs(m_lsin6->sin6_port),
				      &rsin6->sin6_addr,
				      ntohs(rsin6->sin6_port),
				      ntohs(m_rsin6->sin6_port));
		}
	} else
		cc = snprintf(qpd->buf + qpd->pos, space,
			     "qp sq id %u rq id %u state %u onchip %u\n",
			      qp->wq.sq.qid, qp->wq.rq.qid,
			      (int)qp->attr.state,
			      qp->wq.sq.flags & T4_SQ_ONCHIP);
	if (cc < space)
		qpd->pos += cc;
	return 0;
}

static int qp_release(struct inode *inode, struct file *file)
{
	struct c4iw_debugfs_data *qpd = file->private_data;
	if (!qpd) {
		pr_info("%s null qpd?\n", __func__);
		return 0;
	}
	vfree(qpd->buf);
	kfree(qpd);
	return 0;
}

static int qp_open(struct inode *inode, struct file *file)
{
	struct c4iw_qp *qp;
	struct c4iw_debugfs_data *qpd;
	unsigned long index;
	int count = 1;

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

	qpd->devp = inode->i_private;
	qpd->pos = 0;

	/*
	 * No need to lock; we drop the lock to call vmalloc so it's racy
	 * anyway.  Someone who cares should switch this over to seq_file
	 */
	xa_for_each(&qpd->devp->qps, index, qp)
		count++;

	qpd->bufsize = count * 180;
	qpd->buf = vmalloc(qpd->bufsize);
	if (!qpd->buf) {
		kfree(qpd);
		return -ENOMEM;
	}

	xa_lock_irq(&qpd->devp->qps);
	xa_for_each(&qpd->devp->qps, index, qp)
		dump_qp(qp, qpd);
	xa_unlock_irq(&qpd->devp->qps);

	qpd->buf[qpd->pos++] = 0;
	file->private_data = qpd;
	return 0;
}

static const struct file_operations qp_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = qp_open,
	.release = qp_release,
	.read    = debugfs_read,
	.llseek  = default_llseek,
};

static int dump_stag(unsigned long id, struct c4iw_debugfs_data *stagd)
{
	int space;
	int cc;
	struct fw_ri_tpte tpte;
	int ret;

	space = stagd->bufsize - stagd->pos - 1;
	if (space == 0)
		return 1;

	ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
			      (__be32 *)&tpte);
	if (ret) {
		dev_err(&stagd->devp->rdev.lldi.pdev->dev,
			"%s cxgb4_read_tpte err %d\n", __func__, ret);
		return ret;
	}
	cc = snprintf(stagd->buf + stagd->pos, space,
		      "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
		      "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
		      (u32)id<<8,
		      FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
		      FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
		      FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
		      FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
		      FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
		      FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
		      ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
		      ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
	if (cc < space)
		stagd->pos += cc;
	return 0;
}

static int stag_release(struct inode *inode, struct file *file)
{
	struct c4iw_debugfs_data *stagd = file->private_data;
	if (!stagd) {
		pr_info("%s null stagd?\n", __func__);
		return 0;
	}
	vfree(stagd->buf);
	kfree(stagd);
	return 0;
}

static int stag_open(struct inode *inode, struct file *file)
{
	struct c4iw_debugfs_data *stagd;
	void *p;
	unsigned long index;
	int ret = 0;
	int count = 1;

	stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
	if (!stagd) {
		ret = -ENOMEM;
		goto out;
	}
	stagd->devp = inode->i_private;
	stagd->pos = 0;

	xa_for_each(&stagd->devp->mrs, index, p)
		count++;

	stagd->bufsize = count * 256;
	stagd->buf = vmalloc(stagd->bufsize);
	if (!stagd->buf) {
		ret = -ENOMEM;
		goto err1;
	}

	xa_lock_irq(&stagd->devp->mrs);
	xa_for_each(&stagd->devp->mrs, index, p)
		dump_stag(index, stagd);
	xa_unlock_irq(&stagd->devp->mrs);

	stagd->buf[stagd->pos++] = 0;
	file->private_data = stagd;
	goto out;
err1:
	kfree(stagd);
out:
	return ret;
}

static const struct file_operations stag_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = stag_open,
	.release = stag_release,
	.read    = debugfs_read,
	.llseek  = default_llseek,
};

static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};

static int stats_show(struct seq_file *seq, void *v)
{
	struct c4iw_dev *dev = seq->private;

	seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
		   "Max", "Fail");
	seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
			dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
	seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
			dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
	seq_printf(seq, "     SRQS: %10llu %10llu %10llu %10llu\n",
		   dev->rdev.stats.srqt.total, dev->rdev.stats.srqt.cur,
			dev->rdev.stats.srqt.max, dev->rdev.stats.srqt.fail);
	seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
			dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
	seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
			dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
	seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
			dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
	seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
			dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
			dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
	seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
	seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
	seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
	seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
		   db_state_str[dev->db_state],
		   dev->rdev.stats.db_state_transitions,
		   dev->rdev.stats.db_fc_interruptions);
	seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
	seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
		   dev->rdev.stats.act_ofld_conn_fails);
	seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
		   dev->rdev.stats.pas_ofld_conn_fails);
	seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
	seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
	return 0;
}

static int stats_open(struct inode *inode, struct file *file)
{
	return single_open(file, stats_show, inode->i_private);
}

static ssize_t stats_clear(struct file *file, const char __user *buf,
		size_t count, loff_t *pos)
{
	struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;

	mutex_lock(&dev->rdev.stats.lock);
	dev->rdev.stats.pd.max = 0;
	dev->rdev.stats.pd.fail = 0;
	dev->rdev.stats.qid.max = 0;
	dev->rdev.stats.qid.fail = 0;
	dev->rdev.stats.stag.max = 0;
	dev->rdev.stats.stag.fail = 0;
	dev->rdev.stats.pbl.max = 0;
	dev->rdev.stats.pbl.fail = 0;
	dev->rdev.stats.rqt.max = 0;
	dev->rdev.stats.rqt.fail = 0;
	dev->rdev.stats.rqt.max = 0;
	dev->rdev.stats.rqt.fail = 0;
	dev->rdev.stats.ocqp.max = 0;
	dev->rdev.stats.ocqp.fail = 0;
	dev->rdev.stats.db_full = 0;
	dev->rdev.stats.db_empty = 0;
	dev->rdev.stats.db_drop = 0;
	dev->rdev.stats.db_state_transitions = 0;
	dev->rdev.stats.tcam_full = 0;
	dev->rdev.stats.act_ofld_conn_fails = 0;
	dev->rdev.stats.pas_ofld_conn_fails = 0;
	mutex_unlock(&dev->rdev.stats.lock);
	return count;
}

static const struct file_operations stats_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = stats_open,
	.release = single_release,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.write   = stats_clear,
};

static int dump_ep(struct c4iw_ep *ep, struct c4iw_debugfs_data *epd)
{
	int space;
	int cc;

	space = epd->bufsize - epd->pos - 1;
	if (space == 0)
		return 1;

	if (ep->com.local_addr.ss_family == AF_INET) {
		struct sockaddr_in *lsin;
		struct sockaddr_in *rsin;
		struct sockaddr_in *m_lsin;
		struct sockaddr_in *m_rsin;

		set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
		cc = snprintf(epd->buf + epd->pos, space,
			      "ep %p cm_id %p qp %p state %d flags 0x%lx "
			      "history 0x%lx hwtid %d atid %d "
			      "conn_na %u abort_na %u "
			      "%pI4:%d/%d <-> %pI4:%d/%d\n",
			      ep, ep->com.cm_id, ep->com.qp,
			      (int)ep->com.state, ep->com.flags,
			      ep->com.history, ep->hwtid, ep->atid,
			      ep->stats.connect_neg_adv,
			      ep->stats.abort_neg_adv,
			      &lsin->sin_addr, ntohs(lsin->sin_port),
			      ntohs(m_lsin->sin_port),
			      &rsin->sin_addr, ntohs(rsin->sin_port),
			      ntohs(m_rsin->sin_port));
	} else {
		struct sockaddr_in6 *lsin6;
		struct sockaddr_in6 *rsin6;
		struct sockaddr_in6 *m_lsin6;
		struct sockaddr_in6 *m_rsin6;

		set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
		cc = snprintf(epd->buf + epd->pos, space,
			      "ep %p cm_id %p qp %p state %d flags 0x%lx "
			      "history 0x%lx hwtid %d atid %d "
			      "conn_na %u abort_na %u "
			      "%pI6:%d/%d <-> %pI6:%d/%d\n",
			      ep, ep->com.cm_id, ep->com.qp,
			      (int)ep->com.state, ep->com.flags,
			      ep->com.history, ep->hwtid, ep->atid,
			      ep->stats.connect_neg_adv,
			      ep->stats.abort_neg_adv,
			      &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
			      ntohs(m_lsin6->sin6_port),
			      &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
			      ntohs(m_rsin6->sin6_port));
	}
	if (cc < space)
		epd->pos += cc;
	return 0;
}

static
int dump_listen_ep(struct c4iw_listen_ep *ep, struct c4iw_debugfs_data *epd)
{
	int space;
	int cc;

	space = epd->bufsize - epd->pos - 1;
	if (space == 0)
		return 1;

	if (ep->com.local_addr.ss_family == AF_INET) {
		struct sockaddr_in *lsin = (struct sockaddr_in *)
			&ep->com.cm_id->local_addr;
		struct sockaddr_in *m_lsin = (struct sockaddr_in *)
			&ep->com.cm_id->m_local_addr;

		cc = snprintf(epd->buf + epd->pos, space,
			      "ep %p cm_id %p state %d flags 0x%lx stid %d "
			      "backlog %d %pI4:%d/%d\n",
			      ep, ep->com.cm_id, (int)ep->com.state,
			      ep->com.flags, ep->stid, ep->backlog,
			      &lsin->sin_addr, ntohs(lsin->sin_port),
			      ntohs(m_lsin->sin_port));
	} else {
		struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
			&ep->com.cm_id->local_addr;
		struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
			&ep->com.cm_id->m_local_addr;

		cc = snprintf(epd->buf + epd->pos, space,
			      "ep %p cm_id %p state %d flags 0x%lx stid %d "
			      "backlog %d %pI6:%d/%d\n",
			      ep, ep->com.cm_id, (int)ep->com.state,
			      ep->com.flags, ep->stid, ep->backlog,
			      &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
			      ntohs(m_lsin6->sin6_port));
	}
	if (cc < space)
		epd->pos += cc;
	return 0;
}

static int ep_release(struct inode *inode, struct file *file)
{
	struct c4iw_debugfs_data *epd = file->private_data;
	if (!epd) {
		pr_info("%s null qpd?\n", __func__);
		return 0;
	}
	vfree(epd->buf);
	kfree(epd);
	return 0;
}

static int ep_open(struct inode *inode, struct file *file)
{
	struct c4iw_ep *ep;
	struct c4iw_listen_ep *lep;
	unsigned long index;
	struct c4iw_debugfs_data *epd;
	int ret = 0;
	int count = 1;

	epd = kmalloc(sizeof(*epd), GFP_KERNEL);
	if (!epd) {
		ret = -ENOMEM;
		goto out;
	}
	epd->devp = inode->i_private;
	epd->pos = 0;

	xa_for_each(&epd->devp->hwtids, index, ep)
		count++;
	xa_for_each(&epd->devp->atids, index, ep)
		count++;
	xa_for_each(&epd->devp->stids, index, lep)
		count++;

	epd->bufsize = count * 240;
	epd->buf = vmalloc(epd->bufsize);
	if (!epd->buf) {
		ret = -ENOMEM;
		goto err1;
	}

	xa_lock_irq(&epd->devp->hwtids);
	xa_for_each(&epd->devp->hwtids, index, ep)
		dump_ep(ep, epd);
	xa_unlock_irq(&epd->devp->hwtids);
	xa_lock_irq(&epd->devp->atids);
	xa_for_each(&epd->devp->atids, index, ep)
		dump_ep(ep, epd);
	xa_unlock_irq(&epd->devp->atids);
	xa_lock_irq(&epd->devp->stids);
	xa_for_each(&epd->devp->stids, index, lep)
		dump_listen_ep(lep, epd);
	xa_unlock_irq(&epd->devp->stids);

	file->private_data = epd;
	goto out;
err1:
	kfree(epd);
out:
	return ret;
}

static const struct file_operations ep_debugfs_fops = {
	.owner   = THIS_MODULE,
	.open    = ep_open,
	.release = ep_release,
	.read    = debugfs_read,
};

static void setup_debugfs(struct c4iw_dev *devp)
{
	debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
				 (void *)devp, &qp_debugfs_fops, 4096);

	debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
				 (void *)devp, &stag_debugfs_fops, 4096);

	debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
				 (void *)devp, &stats_debugfs_fops, 4096);

	debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
				 (void *)devp, &ep_debugfs_fops, 4096);

	if (c4iw_wr_log)
		debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
					 (void *)devp, &wr_log_debugfs_fops, 4096);
}

void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
			       struct c4iw_dev_ucontext *uctx)
{
	struct list_head *pos, *nxt;
	struct c4iw_qid_list *entry;

	mutex_lock(&uctx->lock);
	list_for_each_safe(pos, nxt, &uctx->qpids) {
		entry = list_entry(pos, struct c4iw_qid_list, entry);
		list_del_init(&entry->entry);
		if (!(entry->qid & rdev->qpmask)) {
			c4iw_put_resource(&rdev->resource.qid_table,
					  entry->qid);
			mutex_lock(&rdev->stats.lock);
			rdev->stats.qid.cur -= rdev->qpmask + 1;
			mutex_unlock(&rdev->stats.lock);
		}
		kfree(entry);
	}

	list_for_each_safe(pos, nxt, &uctx->cqids) {
		entry = list_entry(pos, struct c4iw_qid_list, entry);
		list_del_init(&entry->entry);
		kfree(entry);
	}
	mutex_unlock(&uctx->lock);
}

void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
			    struct c4iw_dev_ucontext *uctx)
{
	INIT_LIST_HEAD(&uctx->qpids);
	INIT_LIST_HEAD(&uctx->cqids);
	mutex_init(&uctx->lock);
}

/* Caller takes care of locking if needed */
static int c4iw_rdev_open(struct c4iw_rdev *rdev)
{
	int err;
	unsigned int factor;

	c4iw_init_dev_ucontext(rdev, &rdev->uctx);

	/*
	 * This implementation assumes udb_density == ucq_density!  Eventually
	 * we might need to support this but for now fail the open. Also the
	 * cqid and qpid range must match for now.
	 */
	if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
		pr_err("%s: unsupported udb/ucq densities %u/%u\n",
		       pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
		       rdev->lldi.ucq_density);
		return -EINVAL;
	}
	if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
	    rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
		pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
		       pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
		       rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
		       rdev->lldi.vr->cq.size);
		return -EINVAL;
	}

	/* This implementation requires a sge_host_page_size <= PAGE_SIZE. */
	if (rdev->lldi.sge_host_page_size > PAGE_SIZE) {
		pr_err("%s: unsupported sge host page size %u\n",
		       pci_name(rdev->lldi.pdev),
		       rdev->lldi.sge_host_page_size);
		return -EINVAL;
	}

	factor = PAGE_SIZE / rdev->lldi.sge_host_page_size;
	rdev->qpmask = (rdev->lldi.udb_density * factor) - 1;
	rdev->cqmask = (rdev->lldi.ucq_density * factor) - 1;

	pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u srq size %u\n",
		 pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
		 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
		 rdev->lldi.vr->pbl.start,
		 rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
		 rdev->lldi.vr->rq.size,
		 rdev->lldi.vr->qp.start,
		 rdev->lldi.vr->qp.size,
		 rdev->lldi.vr->cq.start,
		 rdev->lldi.vr->cq.size,
		 rdev->lldi.vr->srq.size);
	pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
		 &rdev->lldi.pdev->resource[2],
		 rdev->lldi.db_reg, rdev->lldi.gts_reg,
		 rdev->qpmask, rdev->cqmask);

	if (c4iw_num_stags(rdev) == 0)
		return -EINVAL;

	rdev->stats.pd.total = T4_MAX_NUM_PD;
	rdev->stats.stag.total = rdev->lldi.vr->stag.size;
	rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
	rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
	rdev->stats.srqt.total = rdev->lldi.vr->srq.size;
	rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
	rdev->stats.qid.total = rdev->lldi.vr->qp.size;

	err = c4iw_init_resource(rdev, c4iw_num_stags(rdev),
				 T4_MAX_NUM_PD, rdev->lldi.vr->srq.size);
	if (err) {
		pr_err("error %d initializing resources\n", err);
		return err;
	}
	err = c4iw_pblpool_create(rdev);
	if (err) {
		pr_err("error %d initializing pbl pool\n", err);
		goto destroy_resource;
	}
	err = c4iw_rqtpool_create(rdev);
	if (err) {
		pr_err("error %d initializing rqt pool\n", err);
		goto destroy_pblpool;
	}
	err = c4iw_ocqp_pool_create(rdev);
	if (err) {
		pr_err("error %d initializing ocqp pool\n", err);
		goto destroy_rqtpool;
	}
	rdev->status_page = (struct t4_dev_status_page *)
			    __get_free_page(GFP_KERNEL);
	if (!rdev->status_page) {
		err = -ENOMEM;
		goto destroy_ocqp_pool;
	}
	rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
	rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
	rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
	rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
	rdev->status_page->write_cmpl_supported = rdev->lldi.write_cmpl_support;

	if (c4iw_wr_log) {
		rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
				       sizeof(*rdev->wr_log),
				       GFP_KERNEL);
		if (rdev->wr_log) {
			rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
			atomic_set(&rdev->wr_log_idx, 0);
		}
	}

	rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
	if (!rdev->free_workq) {
		err = -ENOMEM;
		goto err_free_status_page_and_wr_log;
	}

	rdev->status_page->db_off = 0;

	init_completion(&rdev->rqt_compl);
	init_completion(&rdev->pbl_compl);
	kref_init(&rdev->rqt_kref);
	kref_init(&rdev->pbl_kref);

	return 0;
err_free_status_page_and_wr_log:
	if (c4iw_wr_log && rdev->wr_log)
		kfree(rdev->wr_log);
	free_page((unsigned long)rdev->status_page);
destroy_ocqp_pool:
	c4iw_ocqp_pool_destroy(rdev);
destroy_rqtpool:
	c4iw_rqtpool_destroy(rdev);
destroy_pblpool:
	c4iw_pblpool_destroy(rdev);
destroy_resource:
	c4iw_destroy_resource(&rdev->resource);
	return err;
}

static void c4iw_rdev_close(struct c4iw_rdev *rdev)
{
	kfree(rdev->wr_log);
	c4iw_release_dev_ucontext(rdev, &rdev->uctx);
	free_page((unsigned long)rdev->status_page);
	c4iw_pblpool_destroy(rdev);
	c4iw_rqtpool_destroy(rdev);
	wait_for_completion(&rdev->pbl_compl);
	wait_for_completion(&rdev->rqt_compl);
	c4iw_ocqp_pool_destroy(rdev);
	destroy_workqueue(rdev->free_workq);
	c4iw_destroy_resource(&rdev->resource);
}

void c4iw_dealloc(struct uld_ctx *ctx)
{
	c4iw_rdev_close(&ctx->dev->rdev);
	WARN_ON(!xa_empty(&ctx->dev->cqs));
	WARN_ON(!xa_empty(&ctx->dev->qps));
	WARN_ON(!xa_empty(&ctx->dev->mrs));
	wait_event(ctx->dev->wait, xa_empty(&ctx->dev->hwtids));
	WARN_ON(!xa_empty(&ctx->dev->stids));
	WARN_ON(!xa_empty(&ctx->dev->atids));
	if (ctx->dev->rdev.bar2_kva)
		iounmap(ctx->dev->rdev.bar2_kva);
	if (ctx->dev->rdev.oc_mw_kva)
		iounmap(ctx->dev->rdev.oc_mw_kva);
	ib_dealloc_device(&ctx->dev->ibdev);
	ctx->dev = NULL;
}

static void c4iw_remove(struct uld_ctx *ctx)
{
	pr_debug("c4iw_dev %p\n", ctx->dev);
	c4iw_unregister_device(ctx->dev);
	c4iw_dealloc(ctx);
}

static int rdma_supported(const struct cxgb4_lld_info *infop)
{
	return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
	       infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
	       infop->vr->cq.size > 0;
}

static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
{
	struct c4iw_dev *devp;
	int ret;

	if (!rdma_supported(infop)) {
		pr_info("%s: RDMA not supported on this device\n",
			pci_name(infop->pdev));
		return ERR_PTR(-ENOSYS);
	}
	if (!ocqp_supported(infop))
		pr_info("%s: On-Chip Queues not supported on this device\n",
			pci_name(infop->pdev));

	devp = ib_alloc_device(c4iw_dev, ibdev);
	if (!devp) {
		pr_err("Cannot allocate ib device\n");
		return ERR_PTR(-ENOMEM);
	}
	devp->rdev.lldi = *infop;

	/* init various hw-queue params based on lld info */
	pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
		 devp->rdev.lldi.sge_ingpadboundary,
		 devp->rdev.lldi.sge_egrstatuspagesize);

	devp->rdev.hw_queue.t4_eq_status_entries =
		devp->rdev.lldi.sge_egrstatuspagesize / 64;
	devp->rdev.hw_queue.t4_max_eq_size = 65520;
	devp->rdev.hw_queue.t4_max_iq_size = 65520;
	devp->rdev.hw_queue.t4_max_rq_size = 8192 -
		devp->rdev.hw_queue.t4_eq_status_entries - 1;
	devp->rdev.hw_queue.t4_max_sq_size =
		devp->rdev.hw_queue.t4_max_eq_size -
		devp->rdev.hw_queue.t4_eq_status_entries - 1;
	devp->rdev.hw_queue.t4_max_qp_depth =
		devp->rdev.hw_queue.t4_max_rq_size;
	devp->rdev.hw_queue.t4_max_cq_depth =
		devp->rdev.hw_queue.t4_max_iq_size - 2;
	devp->rdev.hw_queue.t4_stat_len =
		devp->rdev.lldi.sge_egrstatuspagesize;

	/*
	 * For T5/T6 devices, we map all of BAR2 with WC.
	 * For T4 devices with onchip qp mem, we map only that part
	 * of BAR2 with WC.
	 */
	devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
	if (!is_t4(devp->rdev.lldi.adapter_type)) {
		devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
			pci_resource_len(devp->rdev.lldi.pdev, 2));
		if (!devp->rdev.bar2_kva) {
			pr_err("Unable to ioremap BAR2\n");
			ib_dealloc_device(&devp->ibdev);
			return ERR_PTR(-EINVAL);
		}
	} else if (ocqp_supported(infop)) {
		devp->rdev.oc_mw_pa =
			pci_resource_start(devp->rdev.lldi.pdev, 2) +
			pci_resource_len(devp->rdev.lldi.pdev, 2) -
			roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
		devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
			devp->rdev.lldi.vr->ocq.size);
		if (!devp->rdev.oc_mw_kva) {
			pr_err("Unable to ioremap onchip mem\n");
			ib_dealloc_device(&devp->ibdev);
			return ERR_PTR(-EINVAL);
		}
	}

	pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
		 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
		 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);

	ret = c4iw_rdev_open(&devp->rdev);
	if (ret) {
		pr_err("Unable to open CXIO rdev err %d\n", ret);
		ib_dealloc_device(&devp->ibdev);
		return ERR_PTR(ret);
	}

	xa_init_flags(&devp->cqs, XA_FLAGS_LOCK_IRQ);
	xa_init_flags(&devp->qps, XA_FLAGS_LOCK_IRQ);
	xa_init_flags(&devp->mrs, XA_FLAGS_LOCK_IRQ);
	xa_init_flags(&devp->hwtids, XA_FLAGS_LOCK_IRQ);
	xa_init_flags(&devp->atids, XA_FLAGS_LOCK_IRQ);
	xa_init_flags(&devp->stids, XA_FLAGS_LOCK_IRQ);
	mutex_init(&devp->rdev.stats.lock);
	mutex_init(&devp->db_mutex);
	INIT_LIST_HEAD(&devp->db_fc_list);
	init_waitqueue_head(&devp->wait);
	devp->avail_ird = devp->rdev.lldi.max_ird_adapter;

	if (c4iw_debugfs_root) {
		devp->debugfs_root = debugfs_create_dir(
					pci_name(devp->rdev.lldi.pdev),
					c4iw_debugfs_root);
		setup_debugfs(devp);
	}


	return devp;
}

static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
{
	struct uld_ctx *ctx;
	static int vers_printed;
	int i;

	if (!vers_printed++)
		pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
			DRV_VERSION);

	ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
	if (!ctx) {
		ctx = ERR_PTR(-ENOMEM);
		goto out;
	}
	ctx->lldi = *infop;

	pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
		 pci_name(ctx->lldi.pdev),
		 ctx->lldi.nchan, ctx->lldi.nrxq,
		 ctx->lldi.ntxq, ctx->lldi.nports);

	mutex_lock(&dev_mutex);
	list_add_tail(&ctx->entry, &uld_ctx_list);
	mutex_unlock(&dev_mutex);

	for (i = 0; i < ctx->lldi.nrxq; i++)
		pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
out:
	return ctx;
}

static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
						 const __be64 *rsp,
						 u32 pktshift)
{
	struct sk_buff *skb;

	/*
	 * Allocate space for cpl_pass_accept_req which will be synthesized by
	 * driver. Once the driver synthesizes the request the skb will go
	 * through the regular cpl_pass_accept_req processing.
	 * The math here assumes sizeof cpl_pass_accept_req >= sizeof
	 * cpl_rx_pkt.
	 */
	skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
			sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
	if (unlikely(!skb))
		return NULL;

	__skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
		  sizeof(struct rss_header) - pktshift);

	/*
	 * This skb will contain:
	 *   rss_header from the rspq descriptor (1 flit)
	 *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
	 *   space for the difference between the size of an
	 *      rx_pkt and pass_accept_req cpl (1 flit)
	 *   the packet data from the gl
	 */
	skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
				sizeof(struct rss_header));
	skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
				       sizeof(struct cpl_pass_accept_req),
				       gl->va + pktshift,
				       gl->tot_len - pktshift);
	return skb;
}

static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
			   const __be64 *rsp)
{
	unsigned int opcode = *(u8 *)rsp;
	struct sk_buff *skb;

	if (opcode != CPL_RX_PKT)
		goto out;

	skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
	if (skb == NULL)
		goto out;

	if (c4iw_handlers[opcode] == NULL) {
		pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
		kfree_skb(skb);
		goto out;
	}
	c4iw_handlers[opcode](dev, skb);
	return 1;
out:
	return 0;
}

static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
			const struct pkt_gl *gl)
{
	struct uld_ctx *ctx = handle;
	struct c4iw_dev *dev = ctx->dev;
	struct sk_buff *skb;
	u8 opcode;

	if (gl == NULL) {
		/* omit RSS and rsp_ctrl at end of descriptor */
		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;

		skb = alloc_skb(256, GFP_ATOMIC);
		if (!skb)
			goto nomem;
		__skb_put(skb, len);
		skb_copy_to_linear_data(skb, &rsp[1], len);
	} else if (gl == CXGB4_MSG_AN) {
		const struct rsp_ctrl *rc = (void *)rsp;

		u32 qid = be32_to_cpu(rc->pldbuflen_qid);
		c4iw_ev_handler(dev, qid);
		return 0;
	} else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
		if (recv_rx_pkt(dev, gl, rsp))
			return 0;

		pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
			pci_name(ctx->lldi.pdev), gl->va,
			be64_to_cpu(*rsp),
			be64_to_cpu(*(__force __be64 *)gl->va),
			gl->tot_len);

		return 0;
	} else {
		skb = cxgb4_pktgl_to_skb(gl, 128, 128);
		if (unlikely(!skb))
			goto nomem;
	}

	opcode = *(u8 *)rsp;
	if (c4iw_handlers[opcode]) {
		c4iw_handlers[opcode](dev, skb);
	} else {
		pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
		kfree_skb(skb);
	}

	return 0;
nomem:
	return -1;
}

static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
{
	struct uld_ctx *ctx = handle;

	pr_debug("new_state %u\n", new_state);
	switch (new_state) {
	case CXGB4_STATE_UP:
		pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
		if (!ctx->dev) {
			ctx->dev = c4iw_alloc(&ctx->lldi);
			if (IS_ERR(ctx->dev)) {
				pr_err("%s: initialization failed: %ld\n",
				       pci_name(ctx->lldi.pdev),
				       PTR_ERR(ctx->dev));
				ctx->dev = NULL;
				break;
			}

			INIT_WORK(&ctx->reg_work, c4iw_register_device);
			queue_work(reg_workq, &ctx->reg_work);
		}
		break;
	case CXGB4_STATE_DOWN:
		pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
		if (ctx->dev)
			c4iw_remove(ctx);
		break;
	case CXGB4_STATE_FATAL_ERROR:
	case CXGB4_STATE_START_RECOVERY:
		pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
		if (ctx->dev) {
			struct ib_event event;

			ctx->dev->rdev.flags |= T4_FATAL_ERROR;
			memset(&event, 0, sizeof event);
			event.event  = IB_EVENT_DEVICE_FATAL;
			event.device = &ctx->dev->ibdev;
			ib_dispatch_event(&event);
			c4iw_remove(ctx);
		}
		break;
	case CXGB4_STATE_DETACH:
		pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
		if (ctx->dev)
			c4iw_remove(ctx);
		break;
	}
	return 0;
}

static void stop_queues(struct uld_ctx *ctx)
{
	struct c4iw_qp *qp;
	unsigned long index, flags;

	xa_lock_irqsave(&ctx->dev->qps, flags);
	ctx->dev->rdev.stats.db_state_transitions++;
	ctx->dev->db_state = STOPPED;
	if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
		xa_for_each(&ctx->dev->qps, index, qp)
			t4_disable_wq_db(&qp->wq);
	} else {
		ctx->dev->rdev.status_page->db_off = 1;
	}
	xa_unlock_irqrestore(&ctx->dev->qps, flags);
}

static void resume_rc_qp(struct c4iw_qp *qp)
{
	spin_lock(&qp->lock);
	t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
	qp->wq.sq.wq_pidx_inc = 0;
	t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
	qp->wq.rq.wq_pidx_inc = 0;
	spin_unlock(&qp->lock);
}

static void resume_a_chunk(struct uld_ctx *ctx)
{
	int i;
	struct c4iw_qp *qp;

	for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
		qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
				      db_fc_entry);
		list_del_init(&qp->db_fc_entry);
		resume_rc_qp(qp);
		if (list_empty(&ctx->dev->db_fc_list))
			break;
	}
}

static void resume_queues(struct uld_ctx *ctx)
{
	xa_lock_irq(&ctx->dev->qps);
	if (ctx->dev->db_state != STOPPED)
		goto out;
	ctx->dev->db_state = FLOW_CONTROL;
	while (1) {
		if (list_empty(&ctx->dev->db_fc_list)) {
			struct c4iw_qp *qp;
			unsigned long index;

			WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
			ctx->dev->db_state = NORMAL;
			ctx->dev->rdev.stats.db_state_transitions++;
			if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
				xa_for_each(&ctx->dev->qps, index, qp)
					t4_enable_wq_db(&qp->wq);
			} else {
				ctx->dev->rdev.status_page->db_off = 0;
			}
			break;
		} else {
			if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
			    < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
			       DB_FC_DRAIN_THRESH)) {
				resume_a_chunk(ctx);
			}
			if (!list_empty(&ctx->dev->db_fc_list)) {
				xa_unlock_irq(&ctx->dev->qps);
				if (DB_FC_RESUME_DELAY) {
					set_current_state(TASK_UNINTERRUPTIBLE);
					schedule_timeout(DB_FC_RESUME_DELAY);
				}
				xa_lock_irq(&ctx->dev->qps);
				if (ctx->dev->db_state != FLOW_CONTROL)
					break;
			}
		}
	}
out:
	if (ctx->dev->db_state != NORMAL)
		ctx->dev->rdev.stats.db_fc_interruptions++;
	xa_unlock_irq(&ctx->dev->qps);
}

struct qp_list {
	unsigned idx;
	struct c4iw_qp **qps;
};

static void deref_qps(struct qp_list *qp_list)
{
	int idx;

	for (idx = 0; idx < qp_list->idx; idx++)
		c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
}

static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
{
	int idx;
	int ret;

	for (idx = 0; idx < qp_list->idx; idx++) {
		struct c4iw_qp *qp = qp_list->qps[idx];

		xa_lock_irq(&qp->rhp->qps);
		spin_lock(&qp->lock);
		ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
					  qp->wq.sq.qid,
					  t4_sq_host_wq_pidx(&qp->wq),
					  t4_sq_wq_size(&qp->wq));
		if (ret) {
			pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
			       pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
			spin_unlock(&qp->lock);
			xa_unlock_irq(&qp->rhp->qps);
			return;
		}
		qp->wq.sq.wq_pidx_inc = 0;

		ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
					  qp->wq.rq.qid,
					  t4_rq_host_wq_pidx(&qp->wq),
					  t4_rq_wq_size(&qp->wq));

		if (ret) {
			pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
			       pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
			spin_unlock(&qp->lock);
			xa_unlock_irq(&qp->rhp->qps);
			return;
		}
		qp->wq.rq.wq_pidx_inc = 0;
		spin_unlock(&qp->lock);
		xa_unlock_irq(&qp->rhp->qps);

		/* Wait for the dbfifo to drain */
		while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
			set_current_state(TASK_UNINTERRUPTIBLE);
			schedule_timeout(usecs_to_jiffies(10));
		}
	}
}

static void recover_queues(struct uld_ctx *ctx)
{
	struct c4iw_qp *qp;
	unsigned long index;
	int count = 0;
	struct qp_list qp_list;
	int ret;

	/* slow everybody down */
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(usecs_to_jiffies(1000));

	/* flush the SGE contexts */
	ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
	if (ret) {
		pr_err("%s: Fatal error - DB overflow recovery failed\n",
		       pci_name(ctx->lldi.pdev));
		return;
	}

	/* Count active queues so we can build a list of queues to recover */
	xa_lock_irq(&ctx->dev->qps);
	WARN_ON(ctx->dev->db_state != STOPPED);
	ctx->dev->db_state = RECOVERY;
	xa_for_each(&ctx->dev->qps, index, qp)
		count++;

	qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
	if (!qp_list.qps) {
		xa_unlock_irq(&ctx->dev->qps);
		return;
	}
	qp_list.idx = 0;

	/* add and ref each qp so it doesn't get freed */
	xa_for_each(&ctx->dev->qps, index, qp) {
		c4iw_qp_add_ref(&qp->ibqp);
		qp_list.qps[qp_list.idx++] = qp;
	}

	xa_unlock_irq(&ctx->dev->qps);

	/* now traverse the list in a safe context to recover the db state*/
	recover_lost_dbs(ctx, &qp_list);

	/* we're almost done!  deref the qps and clean up */
	deref_qps(&qp_list);
	kfree(qp_list.qps);

	xa_lock_irq(&ctx->dev->qps);
	WARN_ON(ctx->dev->db_state != RECOVERY);
	ctx->dev->db_state = STOPPED;
	xa_unlock_irq(&ctx->dev->qps);
}

static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
{
	struct uld_ctx *ctx = handle;

	switch (control) {
	case CXGB4_CONTROL_DB_FULL:
		stop_queues(ctx);
		ctx->dev->rdev.stats.db_full++;
		break;
	case CXGB4_CONTROL_DB_EMPTY:
		resume_queues(ctx);
		mutex_lock(&ctx->dev->rdev.stats.lock);
		ctx->dev->rdev.stats.db_empty++;
		mutex_unlock(&ctx->dev->rdev.stats.lock);
		break;
	case CXGB4_CONTROL_DB_DROP:
		recover_queues(ctx);
		mutex_lock(&ctx->dev->rdev.stats.lock);
		ctx->dev->rdev.stats.db_drop++;
		mutex_unlock(&ctx->dev->rdev.stats.lock);
		break;
	default:
		pr_warn("%s: unknown control cmd %u\n",
			pci_name(ctx->lldi.pdev), control);
		break;
	}
	return 0;
}

static struct cxgb4_uld_info c4iw_uld_info = {
	.name = DRV_NAME,
	.nrxq = MAX_ULD_QSETS,
	.ntxq = MAX_ULD_QSETS,
	.rxq_size = 511,
	.ciq = true,
	.lro = false,
	.add = c4iw_uld_add,
	.rx_handler = c4iw_uld_rx_handler,
	.state_change = c4iw_uld_state_change,
	.control = c4iw_uld_control,
};

void _c4iw_free_wr_wait(struct kref *kref)
{
	struct c4iw_wr_wait *wr_waitp;

	wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
	pr_debug("Free wr_wait %p\n", wr_waitp);
	kfree(wr_waitp);
}

struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
{
	struct c4iw_wr_wait *wr_waitp;

	wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
	if (wr_waitp) {
		kref_init(&wr_waitp->kref);
		pr_debug("wr_wait %p\n", wr_waitp);
	}
	return wr_waitp;
}

static int __init c4iw_init_module(void)
{
	int err;

	err = c4iw_cm_init();
	if (err)
		return err;

	c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);

	reg_workq = create_singlethread_workqueue("Register_iWARP_device");
	if (!reg_workq) {
		pr_err("Failed creating workqueue to register iwarp device\n");
		return -ENOMEM;
	}

	cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);

	return 0;
}

static void __exit c4iw_exit_module(void)
{
	struct uld_ctx *ctx, *tmp;

	mutex_lock(&dev_mutex);
	list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
		if (ctx->dev)
			c4iw_remove(ctx);
		kfree(ctx);
	}
	mutex_unlock(&dev_mutex);
	flush_workqueue(reg_workq);
	destroy_workqueue(reg_workq);
	cxgb4_unregister_uld(CXGB4_ULD_RDMA);
	c4iw_cm_term();
	debugfs_remove_recursive(c4iw_debugfs_root);
}

module_init(c4iw_init_module);
module_exit(c4iw_exit_module);