Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
/*
 * Copyright (c) 2018 Cumulus Networks. All rights reserved.
 * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
 * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
 *
 * This software is licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree.
 *
 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 */

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/inet.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/rtnetlink.h>
#include <linux/workqueue.h>
#include <net/devlink.h>
#include <net/ip.h>
#include <uapi/linux/devlink.h>
#include <uapi/linux/ip.h>
#include <uapi/linux/udp.h>

#include "netdevsim.h"

static struct dentry *nsim_dev_ddir;

#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)

static ssize_t nsim_dev_take_snapshot_write(struct file *file,
					    const char __user *data,
					    size_t count, loff_t *ppos)
{
	struct nsim_dev *nsim_dev = file->private_data;
	void *dummy_data;
	int err;
	u32 id;

	dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
	if (!dummy_data)
		return -ENOMEM;

	get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);

	id = devlink_region_shapshot_id_get(priv_to_devlink(nsim_dev));
	err = devlink_region_snapshot_create(nsim_dev->dummy_region,
					     dummy_data, id, kfree);
	if (err) {
		pr_err("Failed to create region snapshot\n");
		kfree(dummy_data);
		return err;
	}

	return count;
}

static const struct file_operations nsim_dev_take_snapshot_fops = {
	.open = simple_open,
	.write = nsim_dev_take_snapshot_write,
	.llseek = generic_file_llseek,
};

static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
{
	char dev_ddir_name[16];

	sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
	nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
	if (IS_ERR_OR_NULL(nsim_dev->ddir))
		return PTR_ERR_OR_ZERO(nsim_dev->ddir) ?: -EINVAL;
	nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
	if (IS_ERR_OR_NULL(nsim_dev->ports_ddir))
		return PTR_ERR_OR_ZERO(nsim_dev->ports_ddir) ?: -EINVAL;
	debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
			    &nsim_dev->fw_update_status);
	debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
			   &nsim_dev->max_macs);
	debugfs_create_bool("test1", 0600, nsim_dev->ddir,
			    &nsim_dev->test1);
	debugfs_create_file("take_snapshot", 0200, nsim_dev->ddir, nsim_dev,
			    &nsim_dev_take_snapshot_fops);
	return 0;
}

static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
{
	debugfs_remove_recursive(nsim_dev->ports_ddir);
	debugfs_remove_recursive(nsim_dev->ddir);
}

static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
				      struct nsim_dev_port *nsim_dev_port)
{
	char port_ddir_name[16];
	char dev_link_name[32];

	sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
	nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
						 nsim_dev->ports_ddir);
	if (IS_ERR_OR_NULL(nsim_dev_port->ddir))
		return -ENOMEM;

	sprintf(dev_link_name, "../../../" DRV_NAME "%u",
		nsim_dev->nsim_bus_dev->dev.id);
	debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);

	return 0;
}

static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
{
	debugfs_remove_recursive(nsim_dev_port->ddir);
}

static struct net *nsim_devlink_net(struct devlink *devlink)
{
	return &init_net;
}

static u64 nsim_dev_ipv4_fib_resource_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, false);
}

static u64 nsim_dev_ipv4_fib_rules_res_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, false);
}

static u64 nsim_dev_ipv6_fib_resource_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, false);
}

static u64 nsim_dev_ipv6_fib_rules_res_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, false);
}

static int nsim_dev_resources_register(struct devlink *devlink)
{
	struct devlink_resource_size_params params = {
		.size_max = (u64)-1,
		.size_granularity = 1,
		.unit = DEVLINK_RESOURCE_UNIT_ENTRY
	};
	struct net *net = nsim_devlink_net(devlink);
	int err;
	u64 n;

	/* Resources for IPv4 */
	err = devlink_resource_register(devlink, "IPv4", (u64)-1,
					NSIM_RESOURCE_IPV4,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv4 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV4_FIB,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV4_FIB_RULES,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB rules resource\n");
		return err;
	}

	/* Resources for IPv6 */
	err = devlink_resource_register(devlink, "IPv6", (u64)-1,
					NSIM_RESOURCE_IPV6,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv6 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV6_FIB,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV6_FIB_RULES,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB rules resource\n");
		return err;
	}

	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB,
					  nsim_dev_ipv4_fib_resource_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB_RULES,
					  nsim_dev_ipv4_fib_rules_res_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB,
					  nsim_dev_ipv6_fib_resource_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB_RULES,
					  nsim_dev_ipv6_fib_rules_res_occ_get,
					  net);
out:
	return err;
}

enum nsim_devlink_param_id {
	NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
	NSIM_DEVLINK_PARAM_ID_TEST1,
};

static const struct devlink_param nsim_devlink_params[] = {
	DEVLINK_PARAM_GENERIC(MAX_MACS,
			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
			      NULL, NULL, NULL),
	DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1,
			     "test1", DEVLINK_PARAM_TYPE_BOOL,
			     BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
			     NULL, NULL, NULL),
};

static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev,
						struct devlink *devlink)
{
	union devlink_param_value value;

	value.vu32 = nsim_dev->max_macs;
	devlink_param_driverinit_value_set(devlink,
					   DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
					   value);
	value.vbool = nsim_dev->test1;
	devlink_param_driverinit_value_set(devlink,
					   NSIM_DEVLINK_PARAM_ID_TEST1,
					   value);
}

static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	union devlink_param_value saved_value;
	int err;

	err = devlink_param_driverinit_value_get(devlink,
						 DEVLINK_PARAM_GENERIC_ID_MAX_MACS,
						 &saved_value);
	if (!err)
		nsim_dev->max_macs = saved_value.vu32;
	err = devlink_param_driverinit_value_get(devlink,
						 NSIM_DEVLINK_PARAM_ID_TEST1,
						 &saved_value);
	if (!err)
		nsim_dev->test1 = saved_value.vbool;
}

#define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16

static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
				      struct devlink *devlink)
{
	nsim_dev->dummy_region =
		devlink_region_create(devlink, "dummy",
				      NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
				      NSIM_DEV_DUMMY_REGION_SIZE);
	return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
}

static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
{
	devlink_region_destroy(nsim_dev->dummy_region);
}

struct nsim_trap_item {
	void *trap_ctx;
	enum devlink_trap_action action;
};

struct nsim_trap_data {
	struct delayed_work trap_report_dw;
	struct nsim_trap_item *trap_items_arr;
	struct nsim_dev *nsim_dev;
	spinlock_t trap_lock;	/* Protects trap_items_arr */
};

/* All driver-specific traps must be documented in
 * Documentation/networking/devlink-trap-netdevsim.rst
 */
enum {
	NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX,
	NSIM_TRAP_ID_FID_MISS,
};

#define NSIM_TRAP_NAME_FID_MISS "fid_miss"

#define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT

#define NSIM_TRAP_DROP(_id, _group_id)					      \
	DEVLINK_TRAP_GENERIC(DROP, DROP, _id,				      \
			     DEVLINK_TRAP_GROUP_GENERIC(_group_id),	      \
			     NSIM_TRAP_METADATA)
#define NSIM_TRAP_EXCEPTION(_id, _group_id)				      \
	DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id,			      \
			     DEVLINK_TRAP_GROUP_GENERIC(_group_id),	      \
			     NSIM_TRAP_METADATA)
#define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id)			      \
	DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id,	      \
			    NSIM_TRAP_NAME_##_id,			      \
			    DEVLINK_TRAP_GROUP_GENERIC(_group_id),	      \
			    NSIM_TRAP_METADATA)

static const struct devlink_trap nsim_traps_arr[] = {
	NSIM_TRAP_DROP(SMAC_MC, L2_DROPS),
	NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
	NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
	NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
	NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
	NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
	NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS),
	NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS),
	NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_DROPS),
	NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS),
};

#define NSIM_TRAP_L4_DATA_LEN 100

static struct sk_buff *nsim_dev_trap_skb_build(void)
{
	int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN;
	struct sk_buff *skb;
	struct udphdr *udph;
	struct ethhdr *eth;
	struct iphdr *iph;

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		return NULL;
	tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len;

	skb_reset_mac_header(skb);
	eth = skb_put(skb, sizeof(struct ethhdr));
	eth_random_addr(eth->h_dest);
	eth_random_addr(eth->h_source);
	eth->h_proto = htons(ETH_P_IP);
	skb->protocol = htons(ETH_P_IP);

	skb_set_network_header(skb, skb->len);
	iph = skb_put(skb, sizeof(struct iphdr));
	iph->protocol = IPPROTO_UDP;
	iph->saddr = in_aton("192.0.2.1");
	iph->daddr = in_aton("198.51.100.1");
	iph->version = 0x4;
	iph->frag_off = 0;
	iph->ihl = 0x5;
	iph->tot_len = htons(tot_len);
	iph->ttl = 100;
	iph->check = 0;
	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);

	skb_set_transport_header(skb, skb->len);
	udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len);
	get_random_bytes(&udph->source, sizeof(u16));
	get_random_bytes(&udph->dest, sizeof(u16));
	udph->len = htons(sizeof(struct udphdr) + data_len);

	return skb;
}

static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port)
{
	struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev;
	struct devlink *devlink = priv_to_devlink(nsim_dev);
	struct nsim_trap_data *nsim_trap_data;
	int i;

	nsim_trap_data = nsim_dev->trap_data;

	spin_lock(&nsim_trap_data->trap_lock);
	for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
		struct nsim_trap_item *nsim_trap_item;
		struct sk_buff *skb;

		nsim_trap_item = &nsim_trap_data->trap_items_arr[i];
		if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP)
			continue;

		skb = nsim_dev_trap_skb_build();
		if (!skb)
			continue;
		skb->dev = nsim_dev_port->ns->netdev;

		/* Trapped packets are usually passed to devlink in softIRQ,
		 * but in this case they are generated in a workqueue. Disable
		 * softIRQs to prevent lockdep from complaining about
		 * "incosistent lock state".
		 */
		local_bh_disable();
		devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx,
				    &nsim_dev_port->devlink_port);
		local_bh_enable();
		consume_skb(skb);
	}
	spin_unlock(&nsim_trap_data->trap_lock);
}

#define NSIM_TRAP_REPORT_INTERVAL_MS	100

static void nsim_dev_trap_report_work(struct work_struct *work)
{
	struct nsim_trap_data *nsim_trap_data;
	struct nsim_dev_port *nsim_dev_port;
	struct nsim_dev *nsim_dev;

	nsim_trap_data = container_of(work, struct nsim_trap_data,
				      trap_report_dw.work);
	nsim_dev = nsim_trap_data->nsim_dev;

	/* For each running port and enabled packet trap, generate a UDP
	 * packet with a random 5-tuple and report it.
	 */
	mutex_lock(&nsim_dev->port_list_lock);
	list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
		if (!netif_running(nsim_dev_port->ns->netdev))
			continue;

		nsim_dev_trap_report(nsim_dev_port);
	}
	mutex_unlock(&nsim_dev->port_list_lock);

	schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
			      msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
}

static int nsim_dev_traps_init(struct devlink *devlink)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	struct nsim_trap_data *nsim_trap_data;
	int err;

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

	nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr),
						 sizeof(struct nsim_trap_item),
						 GFP_KERNEL);
	if (!nsim_trap_data->trap_items_arr) {
		err = -ENOMEM;
		goto err_trap_data_free;
	}

	/* The lock is used to protect the action state of the registered
	 * traps. The value is written by user and read in delayed work when
	 * iterating over all the traps.
	 */
	spin_lock_init(&nsim_trap_data->trap_lock);
	nsim_trap_data->nsim_dev = nsim_dev;
	nsim_dev->trap_data = nsim_trap_data;

	err = devlink_traps_register(devlink, nsim_traps_arr,
				     ARRAY_SIZE(nsim_traps_arr), NULL);
	if (err)
		goto err_trap_items_free;

	INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw,
			  nsim_dev_trap_report_work);
	schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
			      msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));

	return 0;

err_trap_items_free:
	kfree(nsim_trap_data->trap_items_arr);
err_trap_data_free:
	kfree(nsim_trap_data);
	return err;
}

static void nsim_dev_traps_exit(struct devlink *devlink)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);

	cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
	devlink_traps_unregister(devlink, nsim_traps_arr,
				 ARRAY_SIZE(nsim_traps_arr));
	kfree(nsim_dev->trap_data->trap_items_arr);
	kfree(nsim_dev->trap_data);
}

static int nsim_dev_reload_down(struct devlink *devlink,
				struct netlink_ext_ack *extack)
{
	return 0;
}

static int nsim_dev_reload_up(struct devlink *devlink,
			      struct netlink_ext_ack *extack)
{
	enum nsim_resource_id res_ids[] = {
		NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
		NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
	};
	struct net *net = nsim_devlink_net(devlink);
	int i;

	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
		int err;
		u64 val;

		err = devlink_resource_size_get(devlink, res_ids[i], &val);
		if (!err) {
			err = nsim_fib_set_max(net, res_ids[i], val, extack);
			if (err)
				return err;
		}
	}
	nsim_devlink_param_load_driverinit_values(devlink);

	return 0;
}

#define NSIM_DEV_FLASH_SIZE 500000
#define NSIM_DEV_FLASH_CHUNK_SIZE 1000
#define NSIM_DEV_FLASH_CHUNK_TIME_MS 10

static int nsim_dev_flash_update(struct devlink *devlink, const char *file_name,
				 const char *component,
				 struct netlink_ext_ack *extack)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	int i;

	if (nsim_dev->fw_update_status) {
		devlink_flash_update_begin_notify(devlink);
		devlink_flash_update_status_notify(devlink,
						   "Preparing to flash",
						   component, 0, 0);
	}

	for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) {
		if (nsim_dev->fw_update_status)
			devlink_flash_update_status_notify(devlink, "Flashing",
							   component,
							   i * NSIM_DEV_FLASH_CHUNK_SIZE,
							   NSIM_DEV_FLASH_SIZE);
		msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS);
	}

	if (nsim_dev->fw_update_status) {
		devlink_flash_update_status_notify(devlink, "Flashing",
						   component,
						   NSIM_DEV_FLASH_SIZE,
						   NSIM_DEV_FLASH_SIZE);
		devlink_flash_update_status_notify(devlink, "Flashing done",
						   component, 0, 0);
		devlink_flash_update_end_notify(devlink);
	}

	return 0;
}

static struct nsim_trap_item *
nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id)
{
	struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data;
	int i;

	for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) {
		if (nsim_traps_arr[i].id == trap_id)
			return &nsim_trap_data->trap_items_arr[i];
	}

	return NULL;
}

static int nsim_dev_devlink_trap_init(struct devlink *devlink,
				      const struct devlink_trap *trap,
				      void *trap_ctx)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	struct nsim_trap_item *nsim_trap_item;

	nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
	if (WARN_ON(!nsim_trap_item))
		return -ENOENT;

	nsim_trap_item->trap_ctx = trap_ctx;
	nsim_trap_item->action = trap->init_action;

	return 0;
}

static int
nsim_dev_devlink_trap_action_set(struct devlink *devlink,
				 const struct devlink_trap *trap,
				 enum devlink_trap_action action)
{
	struct nsim_dev *nsim_dev = devlink_priv(devlink);
	struct nsim_trap_item *nsim_trap_item;

	nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id);
	if (WARN_ON(!nsim_trap_item))
		return -ENOENT;

	spin_lock(&nsim_dev->trap_data->trap_lock);
	nsim_trap_item->action = action;
	spin_unlock(&nsim_dev->trap_data->trap_lock);

	return 0;
}

static const struct devlink_ops nsim_dev_devlink_ops = {
	.reload_down = nsim_dev_reload_down,
	.reload_up = nsim_dev_reload_up,
	.flash_update = nsim_dev_flash_update,
	.trap_init = nsim_dev_devlink_trap_init,
	.trap_action_set = nsim_dev_devlink_trap_action_set,
};

#define NSIM_DEV_MAX_MACS_DEFAULT 32
#define NSIM_DEV_TEST1_DEFAULT true

static struct nsim_dev *
nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count)
{
	struct nsim_dev *nsim_dev;
	struct devlink *devlink;
	int err;

	devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
	if (!devlink)
		return ERR_PTR(-ENOMEM);
	nsim_dev = devlink_priv(devlink);
	nsim_dev->nsim_bus_dev = nsim_bus_dev;
	nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
	get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
	INIT_LIST_HEAD(&nsim_dev->port_list);
	mutex_init(&nsim_dev->port_list_lock);
	nsim_dev->fw_update_status = true;
	nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
	nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;

	err = nsim_dev_resources_register(devlink);
	if (err)
		goto err_devlink_free;

	err = devlink_register(devlink, &nsim_bus_dev->dev);
	if (err)
		goto err_resources_unregister;

	err = devlink_params_register(devlink, nsim_devlink_params,
				      ARRAY_SIZE(nsim_devlink_params));
	if (err)
		goto err_dl_unregister;
	nsim_devlink_set_params_init_values(nsim_dev, devlink);

	err = nsim_dev_dummy_region_init(nsim_dev, devlink);
	if (err)
		goto err_params_unregister;

	err = nsim_dev_traps_init(devlink);
	if (err)
		goto err_dummy_region_exit;

	err = nsim_dev_debugfs_init(nsim_dev);
	if (err)
		goto err_traps_exit;

	err = nsim_bpf_dev_init(nsim_dev);
	if (err)
		goto err_debugfs_exit;

	devlink_params_publish(devlink);
	devlink_reload_enable(devlink);
	return nsim_dev;

err_debugfs_exit:
	nsim_dev_debugfs_exit(nsim_dev);
err_traps_exit:
	nsim_dev_traps_exit(devlink);
err_dummy_region_exit:
	nsim_dev_dummy_region_exit(nsim_dev);
err_params_unregister:
	devlink_params_unregister(devlink, nsim_devlink_params,
				  ARRAY_SIZE(nsim_devlink_params));
err_dl_unregister:
	devlink_unregister(devlink);
err_resources_unregister:
	devlink_resources_unregister(devlink, NULL);
err_devlink_free:
	devlink_free(devlink);
	return ERR_PTR(err);
}

static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
{
	struct devlink *devlink = priv_to_devlink(nsim_dev);

	devlink_reload_disable(devlink);
	nsim_bpf_dev_exit(nsim_dev);
	nsim_dev_debugfs_exit(nsim_dev);
	nsim_dev_traps_exit(devlink);
	nsim_dev_dummy_region_exit(nsim_dev);
	devlink_params_unregister(devlink, nsim_devlink_params,
				  ARRAY_SIZE(nsim_devlink_params));
	devlink_unregister(devlink);
	devlink_resources_unregister(devlink, NULL);
	mutex_destroy(&nsim_dev->port_list_lock);
	devlink_free(devlink);
}

static int __nsim_dev_port_add(struct nsim_dev *nsim_dev,
			       unsigned int port_index)
{
	struct nsim_dev_port *nsim_dev_port;
	struct devlink_port *devlink_port;
	int err;

	nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL);
	if (!nsim_dev_port)
		return -ENOMEM;
	nsim_dev_port->port_index = port_index;

	devlink_port = &nsim_dev_port->devlink_port;
	devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
			       port_index + 1, 0, 0,
			       nsim_dev->switch_id.id,
			       nsim_dev->switch_id.id_len);
	err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
				    port_index);
	if (err)
		goto err_port_free;

	err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port);
	if (err)
		goto err_dl_port_unregister;

	nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port);
	if (IS_ERR(nsim_dev_port->ns)) {
		err = PTR_ERR(nsim_dev_port->ns);
		goto err_port_debugfs_exit;
	}

	devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev);
	list_add(&nsim_dev_port->list, &nsim_dev->port_list);

	return 0;

err_port_debugfs_exit:
	nsim_dev_port_debugfs_exit(nsim_dev_port);
err_dl_port_unregister:
	devlink_port_unregister(devlink_port);
err_port_free:
	kfree(nsim_dev_port);
	return err;
}

static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
{
	struct devlink_port *devlink_port = &nsim_dev_port->devlink_port;

	list_del(&nsim_dev_port->list);
	devlink_port_type_clear(devlink_port);
	nsim_destroy(nsim_dev_port->ns);
	nsim_dev_port_debugfs_exit(nsim_dev_port);
	devlink_port_unregister(devlink_port);
	kfree(nsim_dev_port);
}

static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
{
	struct nsim_dev_port *nsim_dev_port, *tmp;

	mutex_lock(&nsim_dev->port_list_lock);
	list_for_each_entry_safe(nsim_dev_port, tmp,
				 &nsim_dev->port_list, list)
		__nsim_dev_port_del(nsim_dev_port);
	mutex_unlock(&nsim_dev->port_list_lock);
}

int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
{
	struct nsim_dev *nsim_dev;
	int i;
	int err;

	nsim_dev = nsim_dev_create(nsim_bus_dev, nsim_bus_dev->port_count);
	if (IS_ERR(nsim_dev))
		return PTR_ERR(nsim_dev);
	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);

	mutex_lock(&nsim_dev->port_list_lock);
	for (i = 0; i < nsim_bus_dev->port_count; i++) {
		err = __nsim_dev_port_add(nsim_dev, i);
		if (err)
			goto err_port_del_all;
	}
	mutex_unlock(&nsim_dev->port_list_lock);
	return 0;

err_port_del_all:
	mutex_unlock(&nsim_dev->port_list_lock);
	nsim_dev_port_del_all(nsim_dev);
	nsim_dev_destroy(nsim_dev);
	return err;
}

void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);

	nsim_dev_port_del_all(nsim_dev);
	nsim_dev_destroy(nsim_dev);
}

static struct nsim_dev_port *
__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
{
	struct nsim_dev_port *nsim_dev_port;

	list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list)
		if (nsim_dev_port->port_index == port_index)
			return nsim_dev_port;
	return NULL;
}

int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
		      unsigned int port_index)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
	int err;

	mutex_lock(&nsim_dev->port_list_lock);
	if (__nsim_dev_port_lookup(nsim_dev, port_index))
		err = -EEXIST;
	else
		err = __nsim_dev_port_add(nsim_dev, port_index);
	mutex_unlock(&nsim_dev->port_list_lock);
	return err;
}

int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
		      unsigned int port_index)
{
	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
	struct nsim_dev_port *nsim_dev_port;
	int err = 0;

	mutex_lock(&nsim_dev->port_list_lock);
	nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index);
	if (!nsim_dev_port)
		err = -ENOENT;
	else
		__nsim_dev_port_del(nsim_dev_port);
	mutex_unlock(&nsim_dev->port_list_lock);
	return err;
}

int nsim_dev_init(void)
{
	nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL);
	if (IS_ERR_OR_NULL(nsim_dev_ddir))
		return -ENOMEM;
	return 0;
}

void nsim_dev_exit(void)
{
	debugfs_remove_recursive(nsim_dev_ddir);
}