summaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/device.c
blob: 631eaa9daf65d30156eafd29635315455c912dfa (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
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, 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/string.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/security.h>
#include <linux/notifier.h>
#include <rdma/rdma_netlink.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

#include "core_priv.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("core kernel InfiniBand API");
MODULE_LICENSE("Dual BSD/GPL");

struct ib_client_data {
	struct list_head  list;
	struct ib_client *client;
	void *            data;
	/* The device or client is going down. Do not call client or device
	 * callbacks other than remove(). */
	bool		  going_down;
};

struct workqueue_struct *ib_comp_wq;
struct workqueue_struct *ib_wq;
EXPORT_SYMBOL_GPL(ib_wq);

/* The device_list and client_list contain devices and clients after their
 * registration has completed, and the devices and clients are removed
 * during unregistration. */
static LIST_HEAD(device_list);
static LIST_HEAD(client_list);

/*
 * device_mutex and lists_rwsem protect access to both device_list and
 * client_list.  device_mutex protects writer access by device and client
 * registration / de-registration.  lists_rwsem protects reader access to
 * these lists.  Iterators of these lists must lock it for read, while updates
 * to the lists must be done with a write lock. A special case is when the
 * device_mutex is locked. In this case locking the lists for read access is
 * not necessary as the device_mutex implies it.
 *
 * lists_rwsem also protects access to the client data list.
 */
static DEFINE_MUTEX(device_mutex);
static DECLARE_RWSEM(lists_rwsem);

static int ib_security_change(struct notifier_block *nb, unsigned long event,
			      void *lsm_data);
static void ib_policy_change_task(struct work_struct *work);
static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task);

static struct notifier_block ibdev_lsm_nb = {
	.notifier_call = ib_security_change,
};

static int ib_device_check_mandatory(struct ib_device *device)
{
#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
	static const struct {
		size_t offset;
		char  *name;
	} mandatory_table[] = {
		IB_MANDATORY_FUNC(query_device),
		IB_MANDATORY_FUNC(query_port),
		IB_MANDATORY_FUNC(query_pkey),
		IB_MANDATORY_FUNC(query_gid),
		IB_MANDATORY_FUNC(alloc_pd),
		IB_MANDATORY_FUNC(dealloc_pd),
		IB_MANDATORY_FUNC(create_ah),
		IB_MANDATORY_FUNC(destroy_ah),
		IB_MANDATORY_FUNC(create_qp),
		IB_MANDATORY_FUNC(modify_qp),
		IB_MANDATORY_FUNC(destroy_qp),
		IB_MANDATORY_FUNC(post_send),
		IB_MANDATORY_FUNC(post_recv),
		IB_MANDATORY_FUNC(create_cq),
		IB_MANDATORY_FUNC(destroy_cq),
		IB_MANDATORY_FUNC(poll_cq),
		IB_MANDATORY_FUNC(req_notify_cq),
		IB_MANDATORY_FUNC(get_dma_mr),
		IB_MANDATORY_FUNC(dereg_mr),
		IB_MANDATORY_FUNC(get_port_immutable)
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(mandatory_table); ++i) {
		if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
			pr_warn("Device %s is missing mandatory function %s\n",
				device->name, mandatory_table[i].name);
			return -EINVAL;
		}
	}

	return 0;
}

static struct ib_device *__ib_device_get_by_name(const char *name)
{
	struct ib_device *device;

	list_for_each_entry(device, &device_list, core_list)
		if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
			return device;

	return NULL;
}


static int alloc_name(char *name)
{
	unsigned long *inuse;
	char buf[IB_DEVICE_NAME_MAX];
	struct ib_device *device;
	int i;

	inuse = (unsigned long *) get_zeroed_page(GFP_KERNEL);
	if (!inuse)
		return -ENOMEM;

	list_for_each_entry(device, &device_list, core_list) {
		if (!sscanf(device->name, name, &i))
			continue;
		if (i < 0 || i >= PAGE_SIZE * 8)
			continue;
		snprintf(buf, sizeof buf, name, i);
		if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
			set_bit(i, inuse);
	}

	i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
	free_page((unsigned long) inuse);
	snprintf(buf, sizeof buf, name, i);

	if (__ib_device_get_by_name(buf))
		return -ENFILE;

	strlcpy(name, buf, IB_DEVICE_NAME_MAX);
	return 0;
}

static void ib_device_release(struct device *device)
{
	struct ib_device *dev = container_of(device, struct ib_device, dev);

	WARN_ON(dev->reg_state == IB_DEV_REGISTERED);
	if (dev->reg_state == IB_DEV_UNREGISTERED) {
		/*
		 * In IB_DEV_UNINITIALIZED state, cache or port table
		 * is not even created. Free cache and port table only when
		 * device reaches UNREGISTERED state.
		 */
		ib_cache_release_one(dev);
		kfree(dev->port_immutable);
	}
	kfree(dev);
}

static int ib_device_uevent(struct device *device,
			    struct kobj_uevent_env *env)
{
	struct ib_device *dev = container_of(device, struct ib_device, dev);

	if (add_uevent_var(env, "NAME=%s", dev->name))
		return -ENOMEM;

	/*
	 * It would be nice to pass the node GUID with the event...
	 */

	return 0;
}

static struct class ib_class = {
	.name    = "infiniband",
	.dev_release = ib_device_release,
	.dev_uevent = ib_device_uevent,
};

/**
 * ib_alloc_device - allocate an IB device struct
 * @size:size of structure to allocate
 *
 * Low-level drivers should use ib_alloc_device() to allocate &struct
 * ib_device.  @size is the size of the structure to be allocated,
 * including any private data used by the low-level driver.
 * ib_dealloc_device() must be used to free structures allocated with
 * ib_alloc_device().
 */
struct ib_device *ib_alloc_device(size_t size)
{
	struct ib_device *device;

	if (WARN_ON(size < sizeof(struct ib_device)))
		return NULL;

	device = kzalloc(size, GFP_KERNEL);
	if (!device)
		return NULL;

	device->dev.class = &ib_class;
	device_initialize(&device->dev);

	dev_set_drvdata(&device->dev, device);

	INIT_LIST_HEAD(&device->event_handler_list);
	spin_lock_init(&device->event_handler_lock);
	spin_lock_init(&device->client_data_lock);
	INIT_LIST_HEAD(&device->client_data_list);
	INIT_LIST_HEAD(&device->port_list);

	return device;
}
EXPORT_SYMBOL(ib_alloc_device);

/**
 * ib_dealloc_device - free an IB device struct
 * @device:structure to free
 *
 * Free a structure allocated with ib_alloc_device().
 */
void ib_dealloc_device(struct ib_device *device)
{
	WARN_ON(device->reg_state != IB_DEV_UNREGISTERED &&
		device->reg_state != IB_DEV_UNINITIALIZED);
	kobject_put(&device->dev.kobj);
}
EXPORT_SYMBOL(ib_dealloc_device);

static int add_client_context(struct ib_device *device, struct ib_client *client)
{
	struct ib_client_data *context;
	unsigned long flags;

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

	context->client = client;
	context->data   = NULL;
	context->going_down = false;

	down_write(&lists_rwsem);
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_add(&context->list, &device->client_data_list);
	spin_unlock_irqrestore(&device->client_data_lock, flags);
	up_write(&lists_rwsem);

	return 0;
}

static int verify_immutable(const struct ib_device *dev, u8 port)
{
	return WARN_ON(!rdma_cap_ib_mad(dev, port) &&
			    rdma_max_mad_size(dev, port) != 0);
}

static int read_port_immutable(struct ib_device *device)
{
	int ret;
	u8 start_port = rdma_start_port(device);
	u8 end_port = rdma_end_port(device);
	u8 port;

	/**
	 * device->port_immutable is indexed directly by the port number to make
	 * access to this data as efficient as possible.
	 *
	 * Therefore port_immutable is declared as a 1 based array with
	 * potential empty slots at the beginning.
	 */
	device->port_immutable = kzalloc(sizeof(*device->port_immutable)
					 * (end_port + 1),
					 GFP_KERNEL);
	if (!device->port_immutable)
		return -ENOMEM;

	for (port = start_port; port <= end_port; ++port) {
		ret = device->get_port_immutable(device, port,
						 &device->port_immutable[port]);
		if (ret)
			return ret;

		if (verify_immutable(device, port))
			return -EINVAL;
	}
	return 0;
}

void ib_get_device_fw_str(struct ib_device *dev, char *str, size_t str_len)
{
	if (dev->get_dev_fw_str)
		dev->get_dev_fw_str(dev, str, str_len);
	else
		str[0] = '\0';
}
EXPORT_SYMBOL(ib_get_device_fw_str);

static int setup_port_pkey_list(struct ib_device *device)
{
	int i;

	/**
	 * device->port_pkey_list is indexed directly by the port number,
	 * Therefore it is declared as a 1 based array with potential empty
	 * slots at the beginning.
	 */
	device->port_pkey_list = kcalloc(rdma_end_port(device) + 1,
					 sizeof(*device->port_pkey_list),
					 GFP_KERNEL);

	if (!device->port_pkey_list)
		return -ENOMEM;

	for (i = 0; i < (rdma_end_port(device) + 1); i++) {
		spin_lock_init(&device->port_pkey_list[i].list_lock);
		INIT_LIST_HEAD(&device->port_pkey_list[i].pkey_list);
	}

	return 0;
}

static void ib_policy_change_task(struct work_struct *work)
{
	struct ib_device *dev;

	down_read(&lists_rwsem);
	list_for_each_entry(dev, &device_list, core_list) {
		int i;

		for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) {
			u64 sp;
			int ret = ib_get_cached_subnet_prefix(dev,
							      i,
							      &sp);

			WARN_ONCE(ret,
				  "ib_get_cached_subnet_prefix err: %d, this should never happen here\n",
				  ret);
			ib_security_cache_change(dev, i, sp);
		}
	}
	up_read(&lists_rwsem);
}

static int ib_security_change(struct notifier_block *nb, unsigned long event,
			      void *lsm_data)
{
	if (event != LSM_POLICY_CHANGE)
		return NOTIFY_DONE;

	schedule_work(&ib_policy_change_work);

	return NOTIFY_OK;
}

/**
 * ib_register_device - Register an IB device with IB core
 * @device:Device to register
 *
 * Low-level drivers use ib_register_device() to register their
 * devices with the IB core.  All registered clients will receive a
 * callback for each device that is added. @device must be allocated
 * with ib_alloc_device().
 */
int ib_register_device(struct ib_device *device,
		       int (*port_callback)(struct ib_device *,
					    u8, struct kobject *))
{
	int ret;
	struct ib_client *client;
	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
	struct device *parent = device->dev.parent;

	WARN_ON_ONCE(!parent);
	WARN_ON_ONCE(device->dma_device);
	if (device->dev.dma_ops) {
		/*
		 * The caller provided custom DMA operations. Copy the
		 * DMA-related fields that are used by e.g. dma_alloc_coherent()
		 * into device->dev.
		 */
		device->dma_device = &device->dev;
		if (!device->dev.dma_mask)
			device->dev.dma_mask = parent->dma_mask;
		if (!device->dev.coherent_dma_mask)
			device->dev.coherent_dma_mask =
				parent->coherent_dma_mask;
	} else {
		/*
		 * The caller did not provide custom DMA operations. Use the
		 * DMA mapping operations of the parent device.
		 */
		device->dma_device = parent;
	}

	mutex_lock(&device_mutex);

	if (strchr(device->name, '%')) {
		ret = alloc_name(device->name);
		if (ret)
			goto out;
	}

	if (ib_device_check_mandatory(device)) {
		ret = -EINVAL;
		goto out;
	}

	ret = read_port_immutable(device);
	if (ret) {
		pr_warn("Couldn't create per port immutable data %s\n",
			device->name);
		goto out;
	}

	ret = setup_port_pkey_list(device);
	if (ret) {
		pr_warn("Couldn't create per port_pkey_list\n");
		goto out;
	}

	ret = ib_cache_setup_one(device);
	if (ret) {
		pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n");
		goto port_cleanup;
	}

	ret = ib_device_register_rdmacg(device);
	if (ret) {
		pr_warn("Couldn't register device with rdma cgroup\n");
		goto cache_cleanup;
	}

	memset(&device->attrs, 0, sizeof(device->attrs));
	ret = device->query_device(device, &device->attrs, &uhw);
	if (ret) {
		pr_warn("Couldn't query the device attributes\n");
		goto cache_cleanup;
	}

	ret = ib_device_register_sysfs(device, port_callback);
	if (ret) {
		pr_warn("Couldn't register device %s with driver model\n",
			device->name);
		goto cache_cleanup;
	}

	device->reg_state = IB_DEV_REGISTERED;

	list_for_each_entry(client, &client_list, list)
		if (client->add && !add_client_context(device, client))
			client->add(device);

	down_write(&lists_rwsem);
	list_add_tail(&device->core_list, &device_list);
	up_write(&lists_rwsem);
	mutex_unlock(&device_mutex);
	return 0;

cache_cleanup:
	ib_cache_cleanup_one(device);
	ib_cache_release_one(device);
port_cleanup:
	kfree(device->port_immutable);
out:
	mutex_unlock(&device_mutex);
	return ret;
}
EXPORT_SYMBOL(ib_register_device);

/**
 * ib_unregister_device - Unregister an IB device
 * @device:Device to unregister
 *
 * Unregister an IB device.  All clients will receive a remove callback.
 */
void ib_unregister_device(struct ib_device *device)
{
	struct ib_client_data *context, *tmp;
	unsigned long flags;

	mutex_lock(&device_mutex);

	down_write(&lists_rwsem);
	list_del(&device->core_list);
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
		context->going_down = true;
	spin_unlock_irqrestore(&device->client_data_lock, flags);
	downgrade_write(&lists_rwsem);

	list_for_each_entry_safe(context, tmp, &device->client_data_list,
				 list) {
		if (context->client->remove)
			context->client->remove(device, context->data);
	}
	up_read(&lists_rwsem);

	mutex_unlock(&device_mutex);

	ib_device_unregister_rdmacg(device);
	ib_device_unregister_sysfs(device);
	ib_cache_cleanup_one(device);

	ib_security_destroy_port_pkey_list(device);
	kfree(device->port_pkey_list);

	down_write(&lists_rwsem);
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
		kfree(context);
	spin_unlock_irqrestore(&device->client_data_lock, flags);
	up_write(&lists_rwsem);

	device->reg_state = IB_DEV_UNREGISTERED;
}
EXPORT_SYMBOL(ib_unregister_device);

/**
 * ib_register_client - Register an IB client
 * @client:Client to register
 *
 * Upper level users of the IB drivers can use ib_register_client() to
 * register callbacks for IB device addition and removal.  When an IB
 * device is added, each registered client's add method will be called
 * (in the order the clients were registered), and when a device is
 * removed, each client's remove method will be called (in the reverse
 * order that clients were registered).  In addition, when
 * ib_register_client() is called, the client will receive an add
 * callback for all devices already registered.
 */
int ib_register_client(struct ib_client *client)
{
	struct ib_device *device;

	mutex_lock(&device_mutex);

	list_for_each_entry(device, &device_list, core_list)
		if (client->add && !add_client_context(device, client))
			client->add(device);

	down_write(&lists_rwsem);
	list_add_tail(&client->list, &client_list);
	up_write(&lists_rwsem);

	mutex_unlock(&device_mutex);

	return 0;
}
EXPORT_SYMBOL(ib_register_client);

/**
 * ib_unregister_client - Unregister an IB client
 * @client:Client to unregister
 *
 * Upper level users use ib_unregister_client() to remove their client
 * registration.  When ib_unregister_client() is called, the client
 * will receive a remove callback for each IB device still registered.
 */
void ib_unregister_client(struct ib_client *client)
{
	struct ib_client_data *context, *tmp;
	struct ib_device *device;
	unsigned long flags;

	mutex_lock(&device_mutex);

	down_write(&lists_rwsem);
	list_del(&client->list);
	up_write(&lists_rwsem);

	list_for_each_entry(device, &device_list, core_list) {
		struct ib_client_data *found_context = NULL;

		down_write(&lists_rwsem);
		spin_lock_irqsave(&device->client_data_lock, flags);
		list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
			if (context->client == client) {
				context->going_down = true;
				found_context = context;
				break;
			}
		spin_unlock_irqrestore(&device->client_data_lock, flags);
		up_write(&lists_rwsem);

		if (client->remove)
			client->remove(device, found_context ?
					       found_context->data : NULL);

		if (!found_context) {
			pr_warn("No client context found for %s/%s\n",
				device->name, client->name);
			continue;
		}

		down_write(&lists_rwsem);
		spin_lock_irqsave(&device->client_data_lock, flags);
		list_del(&found_context->list);
		kfree(found_context);
		spin_unlock_irqrestore(&device->client_data_lock, flags);
		up_write(&lists_rwsem);
	}

	mutex_unlock(&device_mutex);
}
EXPORT_SYMBOL(ib_unregister_client);

/**
 * ib_get_client_data - Get IB client context
 * @device:Device to get context for
 * @client:Client to get context for
 *
 * ib_get_client_data() returns client context set with
 * ib_set_client_data().
 */
void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
{
	struct ib_client_data *context;
	void *ret = NULL;
	unsigned long flags;

	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry(context, &device->client_data_list, list)
		if (context->client == client) {
			ret = context->data;
			break;
		}
	spin_unlock_irqrestore(&device->client_data_lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_get_client_data);

/**
 * ib_set_client_data - Set IB client context
 * @device:Device to set context for
 * @client:Client to set context for
 * @data:Context to set
 *
 * ib_set_client_data() sets client context that can be retrieved with
 * ib_get_client_data().
 */
void ib_set_client_data(struct ib_device *device, struct ib_client *client,
			void *data)
{
	struct ib_client_data *context;
	unsigned long flags;

	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry(context, &device->client_data_list, list)
		if (context->client == client) {
			context->data = data;
			goto out;
		}

	pr_warn("No client context found for %s/%s\n",
		device->name, client->name);

out:
	spin_unlock_irqrestore(&device->client_data_lock, flags);
}
EXPORT_SYMBOL(ib_set_client_data);

/**
 * ib_register_event_handler - Register an IB event handler
 * @event_handler:Handler to register
 *
 * ib_register_event_handler() registers an event handler that will be
 * called back when asynchronous IB events occur (as defined in
 * chapter 11 of the InfiniBand Architecture Specification).  This
 * callback may occur in interrupt context.
 */
int ib_register_event_handler  (struct ib_event_handler *event_handler)
{
	unsigned long flags;

	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
	list_add_tail(&event_handler->list,
		      &event_handler->device->event_handler_list);
	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);

	return 0;
}
EXPORT_SYMBOL(ib_register_event_handler);

/**
 * ib_unregister_event_handler - Unregister an event handler
 * @event_handler:Handler to unregister
 *
 * Unregister an event handler registered with
 * ib_register_event_handler().
 */
int ib_unregister_event_handler(struct ib_event_handler *event_handler)
{
	unsigned long flags;

	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
	list_del(&event_handler->list);
	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);

	return 0;
}
EXPORT_SYMBOL(ib_unregister_event_handler);

/**
 * ib_dispatch_event - Dispatch an asynchronous event
 * @event:Event to dispatch
 *
 * Low-level drivers must call ib_dispatch_event() to dispatch the
 * event to all registered event handlers when an asynchronous event
 * occurs.
 */
void ib_dispatch_event(struct ib_event *event)
{
	unsigned long flags;
	struct ib_event_handler *handler;

	spin_lock_irqsave(&event->device->event_handler_lock, flags);

	list_for_each_entry(handler, &event->device->event_handler_list, list)
		handler->handler(handler, event);

	spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
}
EXPORT_SYMBOL(ib_dispatch_event);

/**
 * ib_query_port - Query IB port attributes
 * @device:Device to query
 * @port_num:Port number to query
 * @port_attr:Port attributes
 *
 * ib_query_port() returns the attributes of a port through the
 * @port_attr pointer.
 */
int ib_query_port(struct ib_device *device,
		  u8 port_num,
		  struct ib_port_attr *port_attr)
{
	union ib_gid gid;
	int err;

	if (!rdma_is_port_valid(device, port_num))
		return -EINVAL;

	memset(port_attr, 0, sizeof(*port_attr));
	err = device->query_port(device, port_num, port_attr);
	if (err || port_attr->subnet_prefix)
		return err;

	if (rdma_port_get_link_layer(device, port_num) != IB_LINK_LAYER_INFINIBAND)
		return 0;

	err = ib_query_gid(device, port_num, 0, &gid, NULL);
	if (err)
		return err;

	port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
	return 0;
}
EXPORT_SYMBOL(ib_query_port);

/**
 * ib_query_gid - Get GID table entry
 * @device:Device to query
 * @port_num:Port number to query
 * @index:GID table index to query
 * @gid:Returned GID
 * @attr: Returned GID attributes related to this GID index (only in RoCE).
 *   NULL means ignore.
 *
 * ib_query_gid() fetches the specified GID table entry.
 */
int ib_query_gid(struct ib_device *device,
		 u8 port_num, int index, union ib_gid *gid,
		 struct ib_gid_attr *attr)
{
	if (rdma_cap_roce_gid_table(device, port_num))
		return ib_get_cached_gid(device, port_num, index, gid, attr);

	if (attr)
		return -EINVAL;

	return device->query_gid(device, port_num, index, gid);
}
EXPORT_SYMBOL(ib_query_gid);

/**
 * ib_enum_roce_netdev - enumerate all RoCE ports
 * @ib_dev : IB device we want to query
 * @filter: Should we call the callback?
 * @filter_cookie: Cookie passed to filter
 * @cb: Callback to call for each found RoCE ports
 * @cookie: Cookie passed back to the callback
 *
 * Enumerates all of the physical RoCE ports of ib_dev
 * which are related to netdevice and calls callback() on each
 * device for which filter() function returns non zero.
 */
void ib_enum_roce_netdev(struct ib_device *ib_dev,
			 roce_netdev_filter filter,
			 void *filter_cookie,
			 roce_netdev_callback cb,
			 void *cookie)
{
	u8 port;

	for (port = rdma_start_port(ib_dev); port <= rdma_end_port(ib_dev);
	     port++)
		if (rdma_protocol_roce(ib_dev, port)) {
			struct net_device *idev = NULL;

			if (ib_dev->get_netdev)
				idev = ib_dev->get_netdev(ib_dev, port);

			if (idev &&
			    idev->reg_state >= NETREG_UNREGISTERED) {
				dev_put(idev);
				idev = NULL;
			}

			if (filter(ib_dev, port, idev, filter_cookie))
				cb(ib_dev, port, idev, cookie);

			if (idev)
				dev_put(idev);
		}
}

/**
 * ib_enum_all_roce_netdevs - enumerate all RoCE devices
 * @filter: Should we call the callback?
 * @filter_cookie: Cookie passed to filter
 * @cb: Callback to call for each found RoCE ports
 * @cookie: Cookie passed back to the callback
 *
 * Enumerates all RoCE devices' physical ports which are related
 * to netdevices and calls callback() on each device for which
 * filter() function returns non zero.
 */
void ib_enum_all_roce_netdevs(roce_netdev_filter filter,
			      void *filter_cookie,
			      roce_netdev_callback cb,
			      void *cookie)
{
	struct ib_device *dev;

	down_read(&lists_rwsem);
	list_for_each_entry(dev, &device_list, core_list)
		ib_enum_roce_netdev(dev, filter, filter_cookie, cb, cookie);
	up_read(&lists_rwsem);
}

/**
 * ib_query_pkey - Get P_Key table entry
 * @device:Device to query
 * @port_num:Port number to query
 * @index:P_Key table index to query
 * @pkey:Returned P_Key
 *
 * ib_query_pkey() fetches the specified P_Key table entry.
 */
int ib_query_pkey(struct ib_device *device,
		  u8 port_num, u16 index, u16 *pkey)
{
	return device->query_pkey(device, port_num, index, pkey);
}
EXPORT_SYMBOL(ib_query_pkey);

/**
 * ib_modify_device - Change IB device attributes
 * @device:Device to modify
 * @device_modify_mask:Mask of attributes to change
 * @device_modify:New attribute values
 *
 * ib_modify_device() changes a device's attributes as specified by
 * the @device_modify_mask and @device_modify structure.
 */
int ib_modify_device(struct ib_device *device,
		     int device_modify_mask,
		     struct ib_device_modify *device_modify)
{
	if (!device->modify_device)
		return -ENOSYS;

	return device->modify_device(device, device_modify_mask,
				     device_modify);
}
EXPORT_SYMBOL(ib_modify_device);

/**
 * ib_modify_port - Modifies the attributes for the specified port.
 * @device: The device to modify.
 * @port_num: The number of the port to modify.
 * @port_modify_mask: Mask used to specify which attributes of the port
 *   to change.
 * @port_modify: New attribute values for the port.
 *
 * ib_modify_port() changes a port's attributes as specified by the
 * @port_modify_mask and @port_modify structure.
 */
int ib_modify_port(struct ib_device *device,
		   u8 port_num, int port_modify_mask,
		   struct ib_port_modify *port_modify)
{
	if (!device->modify_port)
		return -ENOSYS;

	if (!rdma_is_port_valid(device, port_num))
		return -EINVAL;

	return device->modify_port(device, port_num, port_modify_mask,
				   port_modify);
}
EXPORT_SYMBOL(ib_modify_port);

/**
 * ib_find_gid - Returns the port number and GID table index where
 *   a specified GID value occurs.
 * @device: The device to query.
 * @gid: The GID value to search for.
 * @gid_type: Type of GID.
 * @ndev: The ndev related to the GID to search for.
 * @port_num: The port number of the device where the GID value was found.
 * @index: The index into the GID table where the GID was found.  This
 *   parameter may be NULL.
 */
int ib_find_gid(struct ib_device *device, union ib_gid *gid,
		enum ib_gid_type gid_type, struct net_device *ndev,
		u8 *port_num, u16 *index)
{
	union ib_gid tmp_gid;
	int ret, port, i;

	for (port = rdma_start_port(device); port <= rdma_end_port(device); ++port) {
		if (rdma_cap_roce_gid_table(device, port)) {
			if (!ib_find_cached_gid_by_port(device, gid, gid_type, port,
							ndev, index)) {
				*port_num = port;
				return 0;
			}
		}

		if (gid_type != IB_GID_TYPE_IB)
			continue;

		for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) {
			ret = ib_query_gid(device, port, i, &tmp_gid, NULL);
			if (ret)
				return ret;
			if (!memcmp(&tmp_gid, gid, sizeof *gid)) {
				*port_num = port;
				if (index)
					*index = i;
				return 0;
			}
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL(ib_find_gid);

/**
 * ib_find_pkey - Returns the PKey table index where a specified
 *   PKey value occurs.
 * @device: The device to query.
 * @port_num: The port number of the device to search for the PKey.
 * @pkey: The PKey value to search for.
 * @index: The index into the PKey table where the PKey was found.
 */
int ib_find_pkey(struct ib_device *device,
		 u8 port_num, u16 pkey, u16 *index)
{
	int ret, i;
	u16 tmp_pkey;
	int partial_ix = -1;

	for (i = 0; i < device->port_immutable[port_num].pkey_tbl_len; ++i) {
		ret = ib_query_pkey(device, port_num, i, &tmp_pkey);
		if (ret)
			return ret;
		if ((pkey & 0x7fff) == (tmp_pkey & 0x7fff)) {
			/* if there is full-member pkey take it.*/
			if (tmp_pkey & 0x8000) {
				*index = i;
				return 0;
			}
			if (partial_ix < 0)
				partial_ix = i;
		}
	}

	/*no full-member, if exists take the limited*/
	if (partial_ix >= 0) {
		*index = partial_ix;
		return 0;
	}
	return -ENOENT;
}
EXPORT_SYMBOL(ib_find_pkey);

/**
 * ib_get_net_dev_by_params() - Return the appropriate net_dev
 * for a received CM request
 * @dev:	An RDMA device on which the request has been received.
 * @port:	Port number on the RDMA device.
 * @pkey:	The Pkey the request came on.
 * @gid:	A GID that the net_dev uses to communicate.
 * @addr:	Contains the IP address that the request specified as its
 *		destination.
 */
struct net_device *ib_get_net_dev_by_params(struct ib_device *dev,
					    u8 port,
					    u16 pkey,
					    const union ib_gid *gid,
					    const struct sockaddr *addr)
{
	struct net_device *net_dev = NULL;
	struct ib_client_data *context;

	if (!rdma_protocol_ib(dev, port))
		return NULL;

	down_read(&lists_rwsem);

	list_for_each_entry(context, &dev->client_data_list, list) {
		struct ib_client *client = context->client;

		if (context->going_down)
			continue;

		if (client->get_net_dev_by_params) {
			net_dev = client->get_net_dev_by_params(dev, port, pkey,
								gid, addr,
								context->data);
			if (net_dev)
				break;
		}
	}

	up_read(&lists_rwsem);

	return net_dev;
}
EXPORT_SYMBOL(ib_get_net_dev_by_params);

static struct ibnl_client_cbs ibnl_ls_cb_table[] = {
	[RDMA_NL_LS_OP_RESOLVE] = {
		.dump = ib_nl_handle_resolve_resp,
		.module = THIS_MODULE },
	[RDMA_NL_LS_OP_SET_TIMEOUT] = {
		.dump = ib_nl_handle_set_timeout,
		.module = THIS_MODULE },
	[RDMA_NL_LS_OP_IP_RESOLVE] = {
		.dump = ib_nl_handle_ip_res_resp,
		.module = THIS_MODULE },
};

static int ib_add_ibnl_clients(void)
{
	return ibnl_add_client(RDMA_NL_LS, ARRAY_SIZE(ibnl_ls_cb_table),
			       ibnl_ls_cb_table);
}

static void ib_remove_ibnl_clients(void)
{
	ibnl_remove_client(RDMA_NL_LS);
}

static int __init ib_core_init(void)
{
	int ret;

	ib_wq = alloc_workqueue("infiniband", 0, 0);
	if (!ib_wq)
		return -ENOMEM;

	ib_comp_wq = alloc_workqueue("ib-comp-wq",
			WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!ib_comp_wq) {
		ret = -ENOMEM;
		goto err;
	}

	ret = class_register(&ib_class);
	if (ret) {
		pr_warn("Couldn't create InfiniBand device class\n");
		goto err_comp;
	}

	ret = ibnl_init();
	if (ret) {
		pr_warn("Couldn't init IB netlink interface\n");
		goto err_sysfs;
	}

	ret = addr_init();
	if (ret) {
		pr_warn("Could't init IB address resolution\n");
		goto err_ibnl;
	}

	ret = ib_mad_init();
	if (ret) {
		pr_warn("Couldn't init IB MAD\n");
		goto err_addr;
	}

	ret = ib_sa_init();
	if (ret) {
		pr_warn("Couldn't init SA\n");
		goto err_mad;
	}

	ret = ib_add_ibnl_clients();
	if (ret) {
		pr_warn("Couldn't register ibnl clients\n");
		goto err_sa;
	}

	ret = register_lsm_notifier(&ibdev_lsm_nb);
	if (ret) {
		pr_warn("Couldn't register LSM notifier. ret %d\n", ret);
		goto err_ibnl_clients;
	}

	ib_cache_setup();

	return 0;

err_ibnl_clients:
	ib_remove_ibnl_clients();
err_sa:
	ib_sa_cleanup();
err_mad:
	ib_mad_cleanup();
err_addr:
	addr_cleanup();
err_ibnl:
	ibnl_cleanup();
err_sysfs:
	class_unregister(&ib_class);
err_comp:
	destroy_workqueue(ib_comp_wq);
err:
	destroy_workqueue(ib_wq);
	return ret;
}

static void __exit ib_core_cleanup(void)
{
	unregister_lsm_notifier(&ibdev_lsm_nb);
	ib_cache_cleanup();
	ib_remove_ibnl_clients();
	ib_sa_cleanup();
	ib_mad_cleanup();
	addr_cleanup();
	ibnl_cleanup();
	class_unregister(&ib_class);
	destroy_workqueue(ib_comp_wq);
	/* Make sure that any pending umem accounting work is done. */
	destroy_workqueue(ib_wq);
}

module_init(ib_core_init);
module_exit(ib_core_cleanup);