Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
/*
 * 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_comp_unbound_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(alloc_pd),
		IB_MANDATORY_FUNC(dealloc_pd),
		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_index(u32 index)
{
	struct ib_device *device;

	list_for_each_entry(device, &device_list, core_list)
		if (device->index == index)
			return device;

	return NULL;
}

/*
 * Caller is responsible to return refrerence count by calling put_device()
 */
struct ib_device *ib_device_get_by_index(u32 index)
{
	struct ib_device *device;

	down_read(&lists_rwsem);
	device = __ib_device_get_by_index(index);
	if (device)
		get_device(&device->dev);

	up_read(&lists_rwsem);
	return device;
}

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;

	rdma_restrack_init(&device->res);

	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);
	rdma_restrack_clean(&device->res);
	put_device(&device->dev);
}
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 = kcalloc(end_port + 1,
					 sizeof(*device->port_immutable),
					 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)
{
	if (dev->get_dev_fw_str)
		dev->get_dev_fw_str(dev, str);
	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);
			if (!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;
}

/**
 *	__dev_new_index	-	allocate an device index
 *
 *	Returns a suitable unique value for a new device interface
 *	number.  It assumes that there are less than 2^32-1 ib devices
 *	will be present in the system.
 */
static u32 __dev_new_index(void)
{
	/*
	 * The device index to allow stable naming.
	 * Similar to struct net -> ifindex.
	 */
	static u32 index;

	for (;;) {
		if (!(++index))
			index = 1;

		if (!__ib_device_get_by_index(index))
			return index;
	}
}

/**
 * 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(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) {
			if (parent)
				device->dev.dma_mask = parent->dma_mask;
			else
				WARN_ON_ONCE(true);
		}
		if (!device->dev.coherent_dma_mask) {
			if (parent)
				device->dev.coherent_dma_mask =
					parent->coherent_dma_mask;
			else
				WARN_ON_ONCE(true);
		}
	} else {
		/*
		 * The caller did not provide custom DMA operations. Use the
		 * DMA mapping operations of the parent device.
		 */
		WARN_ON_ONCE(!parent);
		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 cg_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 cg_cleanup;
	}

	device->reg_state = IB_DEV_REGISTERED;

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

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

cg_cleanup:
	ib_device_unregister_rdmacg(device);
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);

	ib_device_unregister_sysfs(device);
	ib_device_unregister_rdmacg(device);

	mutex_unlock(&device_mutex);

	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 (!add_client_context(device, client) && client->add)
			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.
 */
void 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);
}
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().
 */
void 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);
}
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 = device->query_gid(device, port_num, 0, &gid);
	if (err)
		return err;

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

/**
 * 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_enum_all_devs - enumerate all ib_devices
 * @cb: Callback to call for each found ib_device
 *
 * Enumerates all ib_devices and calls callback() on each device.
 */
int ib_enum_all_devs(nldev_callback nldev_cb, struct sk_buff *skb,
		     struct netlink_callback *cb)
{
	struct ib_device *dev;
	unsigned int idx = 0;
	int ret = 0;

	down_read(&lists_rwsem);
	list_for_each_entry(dev, &device_list, core_list) {
		ret = nldev_cb(dev, skb, cb, idx);
		if (ret)
			break;
		idx++;
	}

	up_read(&lists_rwsem);
	return ret;
}

/**
 * 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)
{
	int rc;

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

	if (device->modify_port)
		rc = device->modify_port(device, port_num, port_modify_mask,
					   port_modify);
	else
		rc = rdma_protocol_roce(device, port_num) ? 0 : -ENOSYS;
	return rc;
}
EXPORT_SYMBOL(ib_modify_port);

/**
 * ib_find_gid - Returns the port number and GID table index where
 *   a specified GID value occurs. Its searches only for IB link layer.
 * @device: The device to query.
 * @gid: The GID value 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,
		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_protocol_ib(device, port))
			continue;

		for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) {
			ret = rdma_query_gid(device, port, i, &tmp_gid);
			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 const struct rdma_nl_cbs ibnl_ls_cb_table[RDMA_NL_LS_NUM_OPS] = {
	[RDMA_NL_LS_OP_RESOLVE] = {
		.doit = ib_nl_handle_resolve_resp,
		.flags = RDMA_NL_ADMIN_PERM,
	},
	[RDMA_NL_LS_OP_SET_TIMEOUT] = {
		.doit = ib_nl_handle_set_timeout,
		.flags = RDMA_NL_ADMIN_PERM,
	},
	[RDMA_NL_LS_OP_IP_RESOLVE] = {
		.doit = ib_nl_handle_ip_res_resp,
		.flags = RDMA_NL_ADMIN_PERM,
	},
};

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;
	}

	ib_comp_unbound_wq =
		alloc_workqueue("ib-comp-unb-wq",
				WQ_UNBOUND | WQ_HIGHPRI | WQ_MEM_RECLAIM |
				WQ_SYSFS, WQ_UNBOUND_MAX_ACTIVE);
	if (!ib_comp_unbound_wq) {
		ret = -ENOMEM;
		goto err_comp;
	}

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

	ret = rdma_nl_init();
	if (ret) {
		pr_warn("Couldn't init IB netlink interface: err %d\n", ret);
		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 = register_lsm_notifier(&ibdev_lsm_nb);
	if (ret) {
		pr_warn("Couldn't register LSM notifier. ret %d\n", ret);
		goto err_sa;
	}

	nldev_init();
	rdma_nl_register(RDMA_NL_LS, ibnl_ls_cb_table);
	roce_gid_mgmt_init();

	return 0;

err_sa:
	ib_sa_cleanup();
err_mad:
	ib_mad_cleanup();
err_addr:
	addr_cleanup();
err_ibnl:
	rdma_nl_exit();
err_sysfs:
	class_unregister(&ib_class);
err_comp_unbound:
	destroy_workqueue(ib_comp_unbound_wq);
err_comp:
	destroy_workqueue(ib_comp_wq);
err:
	destroy_workqueue(ib_wq);
	return ret;
}

static void __exit ib_core_cleanup(void)
{
	roce_gid_mgmt_cleanup();
	nldev_exit();
	rdma_nl_unregister(RDMA_NL_LS);
	unregister_lsm_notifier(&ibdev_lsm_nb);
	ib_sa_cleanup();
	ib_mad_cleanup();
	addr_cleanup();
	rdma_nl_exit();
	class_unregister(&ib_class);
	destroy_workqueue(ib_comp_unbound_wq);
	destroy_workqueue(ib_comp_wq);
	/* Make sure that any pending umem accounting work is done. */
	destroy_workqueue(ib_wq);
}

MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_LS, 4);

subsys_initcall(ib_core_init);
module_exit(ib_core_cleanup);