summaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/cache.c
blob: cb00d59da45616af57a03f29454434ec50fa9826 (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
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Intel Corporation. All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Voltaire, 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/errno.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/netdevice.h>
#include <net/addrconf.h>

#include <rdma/ib_cache.h>

#include "core_priv.h"

struct ib_pkey_cache {
	int             table_len;
	u16             table[0];
};

struct ib_update_work {
	struct work_struct work;
	struct ib_device  *device;
	u8                 port_num;
};

union ib_gid zgid;
EXPORT_SYMBOL(zgid);

static const struct ib_gid_attr zattr;

enum gid_attr_find_mask {
	GID_ATTR_FIND_MASK_GID          = 1UL << 0,
	GID_ATTR_FIND_MASK_NETDEV	= 1UL << 1,
	GID_ATTR_FIND_MASK_DEFAULT	= 1UL << 2,
	GID_ATTR_FIND_MASK_GID_TYPE	= 1UL << 3,
};

enum gid_table_entry_props {
	GID_TABLE_ENTRY_INVALID		= 1UL << 0,
	GID_TABLE_ENTRY_DEFAULT		= 1UL << 1,
};

enum gid_table_write_action {
	GID_TABLE_WRITE_ACTION_ADD,
	GID_TABLE_WRITE_ACTION_DEL,
	/* MODIFY only updates the GID table. Currently only used by
	 * ib_cache_update.
	 */
	GID_TABLE_WRITE_ACTION_MODIFY
};

struct ib_gid_table_entry {
	unsigned long	    props;
	union ib_gid        gid;
	struct ib_gid_attr  attr;
	void		   *context;
};

struct ib_gid_table {
	int                  sz;
	/* In RoCE, adding a GID to the table requires:
	 * (a) Find if this GID is already exists.
	 * (b) Find a free space.
	 * (c) Write the new GID
	 *
	 * Delete requires different set of operations:
	 * (a) Find the GID
	 * (b) Delete it.
	 *
	 * Add/delete should be carried out atomically.
	 * This is done by locking this mutex from multiple
	 * writers. We don't need this lock for IB, as the MAD
	 * layer replaces all entries. All data_vec entries
	 * are locked by this lock.
	 **/
	struct mutex         lock;
	/* This lock protects the table entries from being
	 * read and written simultaneously.
	 */
	rwlock_t	     rwlock;
	struct ib_gid_table_entry *data_vec;
};

static void dispatch_gid_change_event(struct ib_device *ib_dev, u8 port)
{
	if (rdma_cap_roce_gid_table(ib_dev, port)) {
		struct ib_event event;

		event.device		= ib_dev;
		event.element.port_num	= port;
		event.event		= IB_EVENT_GID_CHANGE;

		ib_dispatch_event(&event);
	}
}

static const char * const gid_type_str[] = {
	[IB_GID_TYPE_IB]	= "IB/RoCE v1",
	[IB_GID_TYPE_ROCE_UDP_ENCAP]	= "RoCE v2",
};

const char *ib_cache_gid_type_str(enum ib_gid_type gid_type)
{
	if (gid_type < ARRAY_SIZE(gid_type_str) && gid_type_str[gid_type])
		return gid_type_str[gid_type];

	return "Invalid GID type";
}
EXPORT_SYMBOL(ib_cache_gid_type_str);

int ib_cache_gid_parse_type_str(const char *buf)
{
	unsigned int i;
	size_t len;
	int err = -EINVAL;

	len = strlen(buf);
	if (len == 0)
		return -EINVAL;

	if (buf[len - 1] == '\n')
		len--;

	for (i = 0; i < ARRAY_SIZE(gid_type_str); ++i)
		if (gid_type_str[i] && !strncmp(buf, gid_type_str[i], len) &&
		    len == strlen(gid_type_str[i])) {
			err = i;
			break;
		}

	return err;
}
EXPORT_SYMBOL(ib_cache_gid_parse_type_str);

/* This function expects that rwlock will be write locked in all
 * scenarios and that lock will be locked in sleep-able (RoCE)
 * scenarios.
 */
static int write_gid(struct ib_device *ib_dev, u8 port,
		     struct ib_gid_table *table, int ix,
		     const union ib_gid *gid,
		     const struct ib_gid_attr *attr,
		     enum gid_table_write_action action,
		     bool  default_gid)
	__releases(&table->rwlock) __acquires(&table->rwlock)
{
	int ret = 0;
	struct net_device *old_net_dev;

	/* in rdma_cap_roce_gid_table, this funciton should be protected by a
	 * sleep-able lock.
	 */

	if (rdma_cap_roce_gid_table(ib_dev, port)) {
		table->data_vec[ix].props |= GID_TABLE_ENTRY_INVALID;
		write_unlock_irq(&table->rwlock);
		/* GID_TABLE_WRITE_ACTION_MODIFY currently isn't supported by
		 * RoCE providers and thus only updates the cache.
		 */
		if (action == GID_TABLE_WRITE_ACTION_ADD)
			ret = ib_dev->add_gid(ib_dev, port, ix, gid, attr,
					      &table->data_vec[ix].context);
		else if (action == GID_TABLE_WRITE_ACTION_DEL)
			ret = ib_dev->del_gid(ib_dev, port, ix,
					      &table->data_vec[ix].context);
		write_lock_irq(&table->rwlock);
	}

	old_net_dev = table->data_vec[ix].attr.ndev;
	if (old_net_dev && old_net_dev != attr->ndev)
		dev_put(old_net_dev);
	/* if modify_gid failed, just delete the old gid */
	if (ret || action == GID_TABLE_WRITE_ACTION_DEL) {
		gid = &zgid;
		attr = &zattr;
		table->data_vec[ix].context = NULL;
	}
	if (default_gid)
		table->data_vec[ix].props |= GID_TABLE_ENTRY_DEFAULT;
	memcpy(&table->data_vec[ix].gid, gid, sizeof(*gid));
	memcpy(&table->data_vec[ix].attr, attr, sizeof(*attr));
	if (table->data_vec[ix].attr.ndev &&
	    table->data_vec[ix].attr.ndev != old_net_dev)
		dev_hold(table->data_vec[ix].attr.ndev);

	table->data_vec[ix].props &= ~GID_TABLE_ENTRY_INVALID;

	return ret;
}

static int add_gid(struct ib_device *ib_dev, u8 port,
		   struct ib_gid_table *table, int ix,
		   const union ib_gid *gid,
		   const struct ib_gid_attr *attr,
		   bool  default_gid) {
	return write_gid(ib_dev, port, table, ix, gid, attr,
			 GID_TABLE_WRITE_ACTION_ADD, default_gid);
}

static int modify_gid(struct ib_device *ib_dev, u8 port,
		      struct ib_gid_table *table, int ix,
		      const union ib_gid *gid,
		      const struct ib_gid_attr *attr,
		      bool  default_gid) {
	return write_gid(ib_dev, port, table, ix, gid, attr,
			 GID_TABLE_WRITE_ACTION_MODIFY, default_gid);
}

static int del_gid(struct ib_device *ib_dev, u8 port,
		   struct ib_gid_table *table, int ix,
		   bool  default_gid) {
	return write_gid(ib_dev, port, table, ix, &zgid, &zattr,
			 GID_TABLE_WRITE_ACTION_DEL, default_gid);
}

/* rwlock should be read locked */
static int find_gid(struct ib_gid_table *table, const union ib_gid *gid,
		    const struct ib_gid_attr *val, bool default_gid,
		    unsigned long mask, int *pempty)
{
	int i = 0;
	int found = -1;
	int empty = pempty ? -1 : 0;

	while (i < table->sz && (found < 0 || empty < 0)) {
		struct ib_gid_table_entry *data = &table->data_vec[i];
		struct ib_gid_attr *attr = &data->attr;
		int curr_index = i;

		i++;

		if (data->props & GID_TABLE_ENTRY_INVALID)
			continue;

		if (empty < 0)
			if (!memcmp(&data->gid, &zgid, sizeof(*gid)) &&
			    !memcmp(attr, &zattr, sizeof(*attr)) &&
			    !data->props)
				empty = curr_index;

		if (found >= 0)
			continue;

		if (mask & GID_ATTR_FIND_MASK_GID_TYPE &&
		    attr->gid_type != val->gid_type)
			continue;

		if (mask & GID_ATTR_FIND_MASK_GID &&
		    memcmp(gid, &data->gid, sizeof(*gid)))
			continue;

		if (mask & GID_ATTR_FIND_MASK_NETDEV &&
		    attr->ndev != val->ndev)
			continue;

		if (mask & GID_ATTR_FIND_MASK_DEFAULT &&
		    !!(data->props & GID_TABLE_ENTRY_DEFAULT) !=
		    default_gid)
			continue;

		found = curr_index;
	}

	if (pempty)
		*pempty = empty;

	return found;
}

static void make_default_gid(struct  net_device *dev, union ib_gid *gid)
{
	gid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
	addrconf_ifid_eui48(&gid->raw[8], dev);
}

int ib_cache_gid_add(struct ib_device *ib_dev, u8 port,
		     union ib_gid *gid, struct ib_gid_attr *attr)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	int ix;
	int ret = 0;
	struct net_device *idev;
	int empty;

	table = ports_table[port - rdma_start_port(ib_dev)];

	if (!memcmp(gid, &zgid, sizeof(*gid)))
		return -EINVAL;

	if (ib_dev->get_netdev) {
		idev = ib_dev->get_netdev(ib_dev, port);
		if (idev && attr->ndev != idev) {
			union ib_gid default_gid;

			/* Adding default GIDs in not permitted */
			make_default_gid(idev, &default_gid);
			if (!memcmp(gid, &default_gid, sizeof(*gid))) {
				dev_put(idev);
				return -EPERM;
			}
		}
		if (idev)
			dev_put(idev);
	}

	mutex_lock(&table->lock);
	write_lock_irq(&table->rwlock);

	ix = find_gid(table, gid, attr, false, GID_ATTR_FIND_MASK_GID |
		      GID_ATTR_FIND_MASK_GID_TYPE |
		      GID_ATTR_FIND_MASK_NETDEV, &empty);
	if (ix >= 0)
		goto out_unlock;

	if (empty < 0) {
		ret = -ENOSPC;
		goto out_unlock;
	}

	ret = add_gid(ib_dev, port, table, empty, gid, attr, false);
	if (!ret)
		dispatch_gid_change_event(ib_dev, port);

out_unlock:
	write_unlock_irq(&table->rwlock);
	mutex_unlock(&table->lock);
	return ret;
}

int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
		     union ib_gid *gid, struct ib_gid_attr *attr)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	int ix;

	table = ports_table[port - rdma_start_port(ib_dev)];

	mutex_lock(&table->lock);
	write_lock_irq(&table->rwlock);

	ix = find_gid(table, gid, attr, false,
		      GID_ATTR_FIND_MASK_GID	  |
		      GID_ATTR_FIND_MASK_GID_TYPE |
		      GID_ATTR_FIND_MASK_NETDEV	  |
		      GID_ATTR_FIND_MASK_DEFAULT,
		      NULL);
	if (ix < 0)
		goto out_unlock;

	if (!del_gid(ib_dev, port, table, ix, false))
		dispatch_gid_change_event(ib_dev, port);

out_unlock:
	write_unlock_irq(&table->rwlock);
	mutex_unlock(&table->lock);
	return 0;
}

int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
				     struct net_device *ndev)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	int ix;
	bool deleted = false;

	table  = ports_table[port - rdma_start_port(ib_dev)];

	mutex_lock(&table->lock);
	write_lock_irq(&table->rwlock);

	for (ix = 0; ix < table->sz; ix++)
		if (table->data_vec[ix].attr.ndev == ndev)
			if (!del_gid(ib_dev, port, table, ix, false))
				deleted = true;

	write_unlock_irq(&table->rwlock);
	mutex_unlock(&table->lock);

	if (deleted)
		dispatch_gid_change_event(ib_dev, port);

	return 0;
}

static int __ib_cache_gid_get(struct ib_device *ib_dev, u8 port, int index,
			      union ib_gid *gid, struct ib_gid_attr *attr)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;

	table = ports_table[port - rdma_start_port(ib_dev)];

	if (index < 0 || index >= table->sz)
		return -EINVAL;

	if (table->data_vec[index].props & GID_TABLE_ENTRY_INVALID)
		return -EAGAIN;

	memcpy(gid, &table->data_vec[index].gid, sizeof(*gid));
	if (attr) {
		memcpy(attr, &table->data_vec[index].attr, sizeof(*attr));
		if (attr->ndev)
			dev_hold(attr->ndev);
	}

	return 0;
}

static int _ib_cache_gid_table_find(struct ib_device *ib_dev,
				    const union ib_gid *gid,
				    const struct ib_gid_attr *val,
				    unsigned long mask,
				    u8 *port, u16 *index)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	u8 p;
	int local_index;
	unsigned long flags;

	for (p = 0; p < ib_dev->phys_port_cnt; p++) {
		table = ports_table[p];
		read_lock_irqsave(&table->rwlock, flags);
		local_index = find_gid(table, gid, val, false, mask, NULL);
		if (local_index >= 0) {
			if (index)
				*index = local_index;
			if (port)
				*port = p + rdma_start_port(ib_dev);
			read_unlock_irqrestore(&table->rwlock, flags);
			return 0;
		}
		read_unlock_irqrestore(&table->rwlock, flags);
	}

	return -ENOENT;
}

static int ib_cache_gid_find(struct ib_device *ib_dev,
			     const union ib_gid *gid,
			     enum ib_gid_type gid_type,
			     struct net_device *ndev, u8 *port,
			     u16 *index)
{
	unsigned long mask = GID_ATTR_FIND_MASK_GID |
			     GID_ATTR_FIND_MASK_GID_TYPE;
	struct ib_gid_attr gid_attr_val = {.ndev = ndev, .gid_type = gid_type};

	if (ndev)
		mask |= GID_ATTR_FIND_MASK_NETDEV;

	return _ib_cache_gid_table_find(ib_dev, gid, &gid_attr_val,
					mask, port, index);
}

int ib_find_cached_gid_by_port(struct ib_device *ib_dev,
			       const union ib_gid *gid,
			       enum ib_gid_type gid_type,
			       u8 port, struct net_device *ndev,
			       u16 *index)
{
	int local_index;
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	unsigned long mask = GID_ATTR_FIND_MASK_GID |
			     GID_ATTR_FIND_MASK_GID_TYPE;
	struct ib_gid_attr val = {.ndev = ndev, .gid_type = gid_type};
	unsigned long flags;

	if (port < rdma_start_port(ib_dev) ||
	    port > rdma_end_port(ib_dev))
		return -ENOENT;

	table = ports_table[port - rdma_start_port(ib_dev)];

	if (ndev)
		mask |= GID_ATTR_FIND_MASK_NETDEV;

	read_lock_irqsave(&table->rwlock, flags);
	local_index = find_gid(table, gid, &val, false, mask, NULL);
	if (local_index >= 0) {
		if (index)
			*index = local_index;
		read_unlock_irqrestore(&table->rwlock, flags);
		return 0;
	}

	read_unlock_irqrestore(&table->rwlock, flags);
	return -ENOENT;
}
EXPORT_SYMBOL(ib_find_cached_gid_by_port);

/**
 * ib_find_gid_by_filter - Returns the GID table index where a specified
 * GID value occurs
 * @device: The device to query.
 * @gid: The GID value to search for.
 * @port_num: The port number of the device where the GID value could be
 *   searched.
 * @filter: The filter function is executed on any matching GID in the table.
 *   If the filter function returns true, the corresponding index is returned,
 *   otherwise, we continue searching the GID table. It's guaranteed that
 *   while filter is executed, ndev field is valid and the structure won't
 *   change. filter is executed in an atomic context. filter must not be NULL.
 * @index: The index into the cached GID table where the GID was found.  This
 *   parameter may be NULL.
 *
 * ib_cache_gid_find_by_filter() searches for the specified GID value
 * of which the filter function returns true in the port's GID table.
 * This function is only supported on RoCE ports.
 *
 */
static int ib_cache_gid_find_by_filter(struct ib_device *ib_dev,
				       const union ib_gid *gid,
				       u8 port,
				       bool (*filter)(const union ib_gid *,
						      const struct ib_gid_attr *,
						      void *),
				       void *context,
				       u16 *index)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	struct ib_gid_table *table;
	unsigned int i;
	unsigned long flags;
	bool found = false;

	if (!ports_table)
		return -EOPNOTSUPP;

	if (port < rdma_start_port(ib_dev) ||
	    port > rdma_end_port(ib_dev) ||
	    !rdma_protocol_roce(ib_dev, port))
		return -EPROTONOSUPPORT;

	table = ports_table[port - rdma_start_port(ib_dev)];

	read_lock_irqsave(&table->rwlock, flags);
	for (i = 0; i < table->sz; i++) {
		struct ib_gid_attr attr;

		if (table->data_vec[i].props & GID_TABLE_ENTRY_INVALID)
			goto next;

		if (memcmp(gid, &table->data_vec[i].gid, sizeof(*gid)))
			goto next;

		memcpy(&attr, &table->data_vec[i].attr, sizeof(attr));

		if (filter(gid, &attr, context))
			found = true;

next:
		if (found)
			break;
	}
	read_unlock_irqrestore(&table->rwlock, flags);

	if (!found)
		return -ENOENT;

	if (index)
		*index = i;
	return 0;
}

static struct ib_gid_table *alloc_gid_table(int sz)
{
	struct ib_gid_table *table =
		kzalloc(sizeof(struct ib_gid_table), GFP_KERNEL);

	if (!table)
		return NULL;

	table->data_vec = kcalloc(sz, sizeof(*table->data_vec), GFP_KERNEL);
	if (!table->data_vec)
		goto err_free_table;

	mutex_init(&table->lock);

	table->sz = sz;
	rwlock_init(&table->rwlock);

	return table;

err_free_table:
	kfree(table);
	return NULL;
}

static void release_gid_table(struct ib_gid_table *table)
{
	if (table) {
		kfree(table->data_vec);
		kfree(table);
	}
}

static void cleanup_gid_table_port(struct ib_device *ib_dev, u8 port,
				   struct ib_gid_table *table)
{
	int i;
	bool deleted = false;

	if (!table)
		return;

	write_lock_irq(&table->rwlock);
	for (i = 0; i < table->sz; ++i) {
		if (memcmp(&table->data_vec[i].gid, &zgid,
			   sizeof(table->data_vec[i].gid)))
			if (!del_gid(ib_dev, port, table, i,
				     table->data_vec[i].props &
				     GID_ATTR_FIND_MASK_DEFAULT))
				deleted = true;
	}
	write_unlock_irq(&table->rwlock);

	if (deleted)
		dispatch_gid_change_event(ib_dev, port);
}

void ib_cache_gid_set_default_gid(struct ib_device *ib_dev, u8 port,
				  struct net_device *ndev,
				  unsigned long gid_type_mask,
				  enum ib_cache_gid_default_mode mode)
{
	struct ib_gid_table **ports_table = ib_dev->cache.gid_cache;
	union ib_gid gid;
	struct ib_gid_attr gid_attr;
	struct ib_gid_attr zattr_type = zattr;
	struct ib_gid_table *table;
	unsigned int gid_type;

	table  = ports_table[port - rdma_start_port(ib_dev)];

	make_default_gid(ndev, &gid);
	memset(&gid_attr, 0, sizeof(gid_attr));
	gid_attr.ndev = ndev;

	for (gid_type = 0; gid_type < IB_GID_TYPE_SIZE; ++gid_type) {
		int ix;
		union ib_gid current_gid;
		struct ib_gid_attr current_gid_attr = {};

		if (1UL << gid_type & ~gid_type_mask)
			continue;

		gid_attr.gid_type = gid_type;

		mutex_lock(&table->lock);
		write_lock_irq(&table->rwlock);
		ix = find_gid(table, NULL, &gid_attr, true,
			      GID_ATTR_FIND_MASK_GID_TYPE |
			      GID_ATTR_FIND_MASK_DEFAULT,
			      NULL);

		/* Coudn't find default GID location */
		WARN_ON(ix < 0);

		zattr_type.gid_type = gid_type;

		if (!__ib_cache_gid_get(ib_dev, port, ix,
					&current_gid, &current_gid_attr) &&
		    mode == IB_CACHE_GID_DEFAULT_MODE_SET &&
		    !memcmp(&gid, &current_gid, sizeof(gid)) &&
		    !memcmp(&gid_attr, &current_gid_attr, sizeof(gid_attr)))
			goto release;

		if (memcmp(&current_gid, &zgid, sizeof(current_gid)) ||
		    memcmp(&current_gid_attr, &zattr_type,
			   sizeof(current_gid_attr))) {
			if (del_gid(ib_dev, port, table, ix, true)) {
				pr_warn("ib_cache_gid: can't delete index %d for default gid %pI6\n",
					ix, gid.raw);
				goto release;
			} else {
				dispatch_gid_change_event(ib_dev, port);
			}
		}

		if (mode == IB_CACHE_GID_DEFAULT_MODE_SET) {
			if (add_gid(ib_dev, port, table, ix, &gid, &gid_attr, true))
				pr_warn("ib_cache_gid: unable to add default gid %pI6\n",
					gid.raw);
			else
				dispatch_gid_change_event(ib_dev, port);
		}

release:
		if (current_gid_attr.ndev)
			dev_put(current_gid_attr.ndev);
		write_unlock_irq(&table->rwlock);
		mutex_unlock(&table->lock);
	}
}

static int gid_table_reserve_default(struct ib_device *ib_dev, u8 port,
				     struct ib_gid_table *table)
{
	unsigned int i;
	unsigned long roce_gid_type_mask;
	unsigned int num_default_gids;
	unsigned int current_gid = 0;

	roce_gid_type_mask = roce_gid_type_mask_support(ib_dev, port);
	num_default_gids = hweight_long(roce_gid_type_mask);
	for (i = 0; i < num_default_gids && i < table->sz; i++) {
		struct ib_gid_table_entry *entry =
			&table->data_vec[i];

		entry->props |= GID_TABLE_ENTRY_DEFAULT;
		current_gid = find_next_bit(&roce_gid_type_mask,
					    BITS_PER_LONG,
					    current_gid);
		entry->attr.gid_type = current_gid++;
	}

	return 0;
}

static int _gid_table_setup_one(struct ib_device *ib_dev)
{
	u8 port;
	struct ib_gid_table **table;
	int err = 0;

	table = kcalloc(ib_dev->phys_port_cnt, sizeof(*table), GFP_KERNEL);

	if (!table) {
		pr_warn("failed to allocate ib gid cache for %s\n",
			ib_dev->name);
		return -ENOMEM;
	}

	for (port = 0; port < ib_dev->phys_port_cnt; port++) {
		u8 rdma_port = port + rdma_start_port(ib_dev);

		table[port] =
			alloc_gid_table(
				ib_dev->port_immutable[rdma_port].gid_tbl_len);
		if (!table[port]) {
			err = -ENOMEM;
			goto rollback_table_setup;
		}

		err = gid_table_reserve_default(ib_dev,
						port + rdma_start_port(ib_dev),
						table[port]);
		if (err)
			goto rollback_table_setup;
	}

	ib_dev->cache.gid_cache = table;
	return 0;

rollback_table_setup:
	for (port = 0; port < ib_dev->phys_port_cnt; port++) {
		cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
				       table[port]);
		release_gid_table(table[port]);
	}

	kfree(table);
	return err;
}

static void gid_table_release_one(struct ib_device *ib_dev)
{
	struct ib_gid_table **table = ib_dev->cache.gid_cache;
	u8 port;

	if (!table)
		return;

	for (port = 0; port < ib_dev->phys_port_cnt; port++)
		release_gid_table(table[port]);

	kfree(table);
	ib_dev->cache.gid_cache = NULL;
}

static void gid_table_cleanup_one(struct ib_device *ib_dev)
{
	struct ib_gid_table **table = ib_dev->cache.gid_cache;
	u8 port;

	if (!table)
		return;

	for (port = 0; port < ib_dev->phys_port_cnt; port++)
		cleanup_gid_table_port(ib_dev, port + rdma_start_port(ib_dev),
				       table[port]);
}

static int gid_table_setup_one(struct ib_device *ib_dev)
{
	int err;

	err = _gid_table_setup_one(ib_dev);

	if (err)
		return err;

	err = roce_rescan_device(ib_dev);

	if (err) {
		gid_table_cleanup_one(ib_dev);
		gid_table_release_one(ib_dev);
	}

	return err;
}

int ib_get_cached_gid(struct ib_device *device,
		      u8                port_num,
		      int               index,
		      union ib_gid     *gid,
		      struct ib_gid_attr *gid_attr)
{
	int res;
	unsigned long flags;
	struct ib_gid_table **ports_table = device->cache.gid_cache;
	struct ib_gid_table *table = ports_table[port_num - rdma_start_port(device)];

	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
		return -EINVAL;

	read_lock_irqsave(&table->rwlock, flags);
	res = __ib_cache_gid_get(device, port_num, index, gid, gid_attr);
	read_unlock_irqrestore(&table->rwlock, flags);

	return res;
}
EXPORT_SYMBOL(ib_get_cached_gid);

int ib_find_cached_gid(struct ib_device *device,
		       const union ib_gid *gid,
		       enum ib_gid_type gid_type,
		       struct net_device *ndev,
		       u8               *port_num,
		       u16              *index)
{
	return ib_cache_gid_find(device, gid, gid_type, ndev, port_num, index);
}
EXPORT_SYMBOL(ib_find_cached_gid);

int ib_find_gid_by_filter(struct ib_device *device,
			  const union ib_gid *gid,
			  u8 port_num,
			  bool (*filter)(const union ib_gid *gid,
					 const struct ib_gid_attr *,
					 void *),
			  void *context, u16 *index)
{
	/* Only RoCE GID table supports filter function */
	if (!rdma_cap_roce_gid_table(device, port_num) && filter)
		return -EPROTONOSUPPORT;

	return ib_cache_gid_find_by_filter(device, gid,
					   port_num, filter,
					   context, index);
}
EXPORT_SYMBOL(ib_find_gid_by_filter);

int ib_get_cached_pkey(struct ib_device *device,
		       u8                port_num,
		       int               index,
		       u16              *pkey)
{
	struct ib_pkey_cache *cache;
	unsigned long flags;
	int ret = 0;

	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
		return -EINVAL;

	read_lock_irqsave(&device->cache.lock, flags);

	cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];

	if (index < 0 || index >= cache->table_len)
		ret = -EINVAL;
	else
		*pkey = cache->table[index];

	read_unlock_irqrestore(&device->cache.lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_get_cached_pkey);

int ib_find_cached_pkey(struct ib_device *device,
			u8                port_num,
			u16               pkey,
			u16              *index)
{
	struct ib_pkey_cache *cache;
	unsigned long flags;
	int i;
	int ret = -ENOENT;
	int partial_ix = -1;

	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
		return -EINVAL;

	read_lock_irqsave(&device->cache.lock, flags);

	cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];

	*index = -1;

	for (i = 0; i < cache->table_len; ++i)
		if ((cache->table[i] & 0x7fff) == (pkey & 0x7fff)) {
			if (cache->table[i] & 0x8000) {
				*index = i;
				ret = 0;
				break;
			} else
				partial_ix = i;
		}

	if (ret && partial_ix >= 0) {
		*index = partial_ix;
		ret = 0;
	}

	read_unlock_irqrestore(&device->cache.lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_find_cached_pkey);

int ib_find_exact_cached_pkey(struct ib_device *device,
			      u8                port_num,
			      u16               pkey,
			      u16              *index)
{
	struct ib_pkey_cache *cache;
	unsigned long flags;
	int i;
	int ret = -ENOENT;

	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
		return -EINVAL;

	read_lock_irqsave(&device->cache.lock, flags);

	cache = device->cache.pkey_cache[port_num - rdma_start_port(device)];

	*index = -1;

	for (i = 0; i < cache->table_len; ++i)
		if (cache->table[i] == pkey) {
			*index = i;
			ret = 0;
			break;
		}

	read_unlock_irqrestore(&device->cache.lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_find_exact_cached_pkey);

int ib_get_cached_lmc(struct ib_device *device,
		      u8                port_num,
		      u8                *lmc)
{
	unsigned long flags;
	int ret = 0;

	if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
		return -EINVAL;

	read_lock_irqsave(&device->cache.lock, flags);
	*lmc = device->cache.lmc_cache[port_num - rdma_start_port(device)];
	read_unlock_irqrestore(&device->cache.lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_get_cached_lmc);

static void ib_cache_update(struct ib_device *device,
			    u8                port)
{
	struct ib_port_attr       *tprops = NULL;
	struct ib_pkey_cache      *pkey_cache = NULL, *old_pkey_cache;
	struct ib_gid_cache {
		int             table_len;
		union ib_gid    table[0];
	}			  *gid_cache = NULL;
	int                        i;
	int                        ret;
	struct ib_gid_table	  *table;
	struct ib_gid_table	 **ports_table = device->cache.gid_cache;
	bool			   use_roce_gid_table =
					rdma_cap_roce_gid_table(device, port);

	if (port < rdma_start_port(device) || port > rdma_end_port(device))
		return;

	table = ports_table[port - rdma_start_port(device)];

	tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
	if (!tprops)
		return;

	ret = ib_query_port(device, port, tprops);
	if (ret) {
		pr_warn("ib_query_port failed (%d) for %s\n",
			ret, device->name);
		goto err;
	}

	pkey_cache = kmalloc(sizeof *pkey_cache + tprops->pkey_tbl_len *
			     sizeof *pkey_cache->table, GFP_KERNEL);
	if (!pkey_cache)
		goto err;

	pkey_cache->table_len = tprops->pkey_tbl_len;

	if (!use_roce_gid_table) {
		gid_cache = kmalloc(sizeof(*gid_cache) + tprops->gid_tbl_len *
			    sizeof(*gid_cache->table), GFP_KERNEL);
		if (!gid_cache)
			goto err;

		gid_cache->table_len = tprops->gid_tbl_len;
	}

	for (i = 0; i < pkey_cache->table_len; ++i) {
		ret = ib_query_pkey(device, port, i, pkey_cache->table + i);
		if (ret) {
			pr_warn("ib_query_pkey failed (%d) for %s (index %d)\n",
				ret, device->name, i);
			goto err;
		}
	}

	if (!use_roce_gid_table) {
		for (i = 0;  i < gid_cache->table_len; ++i) {
			ret = ib_query_gid(device, port, i,
					   gid_cache->table + i, NULL);
			if (ret) {
				pr_warn("ib_query_gid failed (%d) for %s (index %d)\n",
					ret, device->name, i);
				goto err;
			}
		}
	}

	write_lock_irq(&device->cache.lock);

	old_pkey_cache = device->cache.pkey_cache[port - rdma_start_port(device)];

	device->cache.pkey_cache[port - rdma_start_port(device)] = pkey_cache;
	if (!use_roce_gid_table) {
		write_lock(&table->rwlock);
		for (i = 0; i < gid_cache->table_len; i++) {
			modify_gid(device, port, table, i, gid_cache->table + i,
				   &zattr, false);
		}
		write_unlock(&table->rwlock);
	}

	device->cache.lmc_cache[port - rdma_start_port(device)] = tprops->lmc;

	write_unlock_irq(&device->cache.lock);

	kfree(gid_cache);
	kfree(old_pkey_cache);
	kfree(tprops);
	return;

err:
	kfree(pkey_cache);
	kfree(gid_cache);
	kfree(tprops);
}

static void ib_cache_task(struct work_struct *_work)
{
	struct ib_update_work *work =
		container_of(_work, struct ib_update_work, work);

	ib_cache_update(work->device, work->port_num);
	kfree(work);
}

static void ib_cache_event(struct ib_event_handler *handler,
			   struct ib_event *event)
{
	struct ib_update_work *work;

	if (event->event == IB_EVENT_PORT_ERR    ||
	    event->event == IB_EVENT_PORT_ACTIVE ||
	    event->event == IB_EVENT_LID_CHANGE  ||
	    event->event == IB_EVENT_PKEY_CHANGE ||
	    event->event == IB_EVENT_SM_CHANGE   ||
	    event->event == IB_EVENT_CLIENT_REREGISTER ||
	    event->event == IB_EVENT_GID_CHANGE) {
		work = kmalloc(sizeof *work, GFP_ATOMIC);
		if (work) {
			INIT_WORK(&work->work, ib_cache_task);
			work->device   = event->device;
			work->port_num = event->element.port_num;
			queue_work(ib_wq, &work->work);
		}
	}
}

int ib_cache_setup_one(struct ib_device *device)
{
	int p;
	int err;

	rwlock_init(&device->cache.lock);

	device->cache.pkey_cache =
		kzalloc(sizeof *device->cache.pkey_cache *
			(rdma_end_port(device) - rdma_start_port(device) + 1), GFP_KERNEL);
	device->cache.lmc_cache = kmalloc(sizeof *device->cache.lmc_cache *
					  (rdma_end_port(device) -
					   rdma_start_port(device) + 1),
					  GFP_KERNEL);
	if (!device->cache.pkey_cache ||
	    !device->cache.lmc_cache) {
		pr_warn("Couldn't allocate cache for %s\n", device->name);
		return -ENOMEM;
	}

	err = gid_table_setup_one(device);
	if (err)
		/* Allocated memory will be cleaned in the release function */
		return err;

	for (p = 0; p <= rdma_end_port(device) - rdma_start_port(device); ++p)
		ib_cache_update(device, p + rdma_start_port(device));

	INIT_IB_EVENT_HANDLER(&device->cache.event_handler,
			      device, ib_cache_event);
	err = ib_register_event_handler(&device->cache.event_handler);
	if (err)
		goto err;

	return 0;

err:
	gid_table_cleanup_one(device);
	return err;
}

void ib_cache_release_one(struct ib_device *device)
{
	int p;

	/*
	 * The release function frees all the cache elements.
	 * This function should be called as part of freeing
	 * all the device's resources when the cache could no
	 * longer be accessed.
	 */
	if (device->cache.pkey_cache)
		for (p = 0;
		     p <= rdma_end_port(device) - rdma_start_port(device); ++p)
			kfree(device->cache.pkey_cache[p]);

	gid_table_release_one(device);
	kfree(device->cache.pkey_cache);
	kfree(device->cache.lmc_cache);
}

void ib_cache_cleanup_one(struct ib_device *device)
{
	/* The cleanup function unregisters the event handler,
	 * waits for all in-progress workqueue elements and cleans
	 * up the GID cache. This function should be called after
	 * the device was removed from the devices list and all
	 * clients were removed, so the cache exists but is
	 * non-functional and shouldn't be updated anymore.
	 */
	ib_unregister_event_handler(&device->cache.event_handler);
	flush_workqueue(ib_wq);
	gid_table_cleanup_one(device);
}

void __init ib_cache_setup(void)
{
	roce_gid_mgmt_init();
}

void __exit ib_cache_cleanup(void)
{
	roce_gid_mgmt_cleanup();
}