summaryrefslogtreecommitdiff
path: root/drivers/net/netdevsim/bpf.c
blob: 608953d4f98da9f2e44b006e8187b0e445b1d38c (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
/*
 * Copyright (C) 2017 Netronome Systems, Inc.
 *
 * 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/bpf.h>
#include <linux/bpf_verifier.h>
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/rtnetlink.h>
#include <net/pkt_cls.h>

#include "netdevsim.h"

#define pr_vlog(env, fmt, ...)	\
	bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)

struct nsim_bpf_bound_prog {
	struct nsim_dev *nsim_dev;
	struct bpf_prog *prog;
	struct dentry *ddir;
	const char *state;
	bool is_loaded;
	struct list_head l;
};

#define NSIM_BPF_MAX_KEYS		2

struct nsim_bpf_bound_map {
	struct netdevsim *ns;
	struct bpf_offloaded_map *map;
	struct mutex mutex;
	struct nsim_map_entry {
		void *key;
		void *value;
	} entry[NSIM_BPF_MAX_KEYS];
	struct list_head l;
};

static int nsim_bpf_string_show(struct seq_file *file, void *data)
{
	const char **str = file->private;

	if (*str)
		seq_printf(file, "%s\n", *str);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string);

static int
nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
{
	struct nsim_bpf_bound_prog *state;
	int ret = 0;

	state = env->prog->aux->offload->dev_priv;
	if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx)
		msleep(state->nsim_dev->bpf_bind_verifier_delay);

	if (insn_idx == env->prog->len - 1) {
		pr_vlog(env, "Hello from netdevsim!\n");

		if (!state->nsim_dev->bpf_bind_verifier_accept)
			ret = -EOPNOTSUPP;
	}

	return ret;
}

static int nsim_bpf_finalize(struct bpf_verifier_env *env)
{
	return 0;
}

static bool nsim_xdp_offload_active(struct netdevsim *ns)
{
	return ns->xdp_hw.prog;
}

static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
{
	struct nsim_bpf_bound_prog *state;

	if (!prog || !bpf_prog_is_offloaded(prog->aux))
		return;

	state = prog->aux->offload->dev_priv;
	state->is_loaded = loaded;
}

static int
nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
{
	nsim_prog_set_loaded(ns->bpf_offloaded, false);

	WARN(!!ns->bpf_offloaded != oldprog,
	     "bad offload state, expected offload %sto be active",
	     oldprog ? "" : "not ");
	ns->bpf_offloaded = prog;
	ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
	nsim_prog_set_loaded(prog, true);

	return 0;
}

int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
			       void *type_data, void *cb_priv)
{
	struct tc_cls_bpf_offload *cls_bpf = type_data;
	struct bpf_prog *prog = cls_bpf->prog;
	struct netdevsim *ns = cb_priv;
	struct bpf_prog *oldprog;

	if (type != TC_SETUP_CLSBPF) {
		NSIM_EA(cls_bpf->common.extack,
			"only offload of BPF classifiers supported");
		return -EOPNOTSUPP;
	}

	if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
		return -EOPNOTSUPP;

	if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
		NSIM_EA(cls_bpf->common.extack,
			"only ETH_P_ALL supported as filter protocol");
		return -EOPNOTSUPP;
	}

	if (!ns->bpf_tc_accept) {
		NSIM_EA(cls_bpf->common.extack,
			"netdevsim configured to reject BPF TC offload");
		return -EOPNOTSUPP;
	}
	/* Note: progs without skip_sw will probably not be dev bound */
	if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
		NSIM_EA(cls_bpf->common.extack,
			"netdevsim configured to reject unbound programs");
		return -EOPNOTSUPP;
	}

	if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
		return -EOPNOTSUPP;

	oldprog = cls_bpf->oldprog;

	/* Don't remove if oldprog doesn't match driver's state */
	if (ns->bpf_offloaded != oldprog) {
		oldprog = NULL;
		if (!cls_bpf->prog)
			return 0;
		if (ns->bpf_offloaded) {
			NSIM_EA(cls_bpf->common.extack,
				"driver and netdev offload states mismatch");
			return -EBUSY;
		}
	}

	return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
}

int nsim_bpf_disable_tc(struct netdevsim *ns)
{
	if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
		return -EBUSY;
	return 0;
}

static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
{
	if (!nsim_xdp_offload_active(ns) && !bpf->prog)
		return 0;
	if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
		NSIM_EA(bpf->extack, "TC program is already loaded");
		return -EBUSY;
	}

	return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
}

static int
nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
		  struct xdp_attachment_info *xdp)
{
	int err;

	if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
		NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
		return -EOPNOTSUPP;
	}
	if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
		NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
		return -EOPNOTSUPP;
	}

	if (bpf->command == XDP_SETUP_PROG_HW) {
		err = nsim_xdp_offload_prog(ns, bpf);
		if (err)
			return err;
	}

	xdp_attachment_setup(xdp, bpf);

	return 0;
}

static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
				struct bpf_prog *prog)
{
	struct nsim_bpf_bound_prog *state;
	char name[16];
	int ret;

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

	state->nsim_dev = nsim_dev;
	state->prog = prog;
	state->state = "verify";

	/* Program id is not populated yet when we create the state. */
	sprintf(name, "%u", nsim_dev->prog_id_gen++);
	state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs);
	if (IS_ERR(state->ddir)) {
		ret = PTR_ERR(state->ddir);
		kfree(state);
		return ret;
	}

	debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
	debugfs_create_file("state", 0400, state->ddir,
			    &state->state, &nsim_bpf_string_fops);
	debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);

	list_add_tail(&state->l, &nsim_dev->bpf_bound_progs);

	prog->aux->offload->dev_priv = state;

	return 0;
}

static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
{
	struct nsim_dev *nsim_dev =
			bpf_offload_dev_priv(prog->aux->offload->offdev);

	if (!nsim_dev->bpf_bind_accept)
		return -EOPNOTSUPP;

	return nsim_bpf_create_prog(nsim_dev, prog);
}

static int nsim_bpf_translate(struct bpf_prog *prog)
{
	struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;

	state->state = "xlated";
	return 0;
}

static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
{
	struct nsim_bpf_bound_prog *state;

	state = prog->aux->offload->dev_priv;
	WARN(state->is_loaded,
	     "offload state destroyed while program still bound");
	debugfs_remove_recursive(state->ddir);
	list_del(&state->l);
	kfree(state);
}

static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = {
	.insn_hook	= nsim_bpf_verify_insn,
	.finalize	= nsim_bpf_finalize,
	.prepare	= nsim_bpf_verifier_prep,
	.translate	= nsim_bpf_translate,
	.destroy	= nsim_bpf_destroy_prog,
};

static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
{
	if (bpf->prog && bpf->prog->aux->offload) {
		NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
		return -EINVAL;
	}
	if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
		NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
		return -EINVAL;
	}
	return 0;
}

static int
nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
{
	struct nsim_bpf_bound_prog *state;

	if (!bpf->prog)
		return 0;

	if (!bpf_prog_is_offloaded(bpf->prog->aux)) {
		NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
		return -EINVAL;
	}

	state = bpf->prog->aux->offload->dev_priv;
	if (WARN_ON(strcmp(state->state, "xlated"))) {
		NSIM_EA(bpf->extack, "offloading program in bad state");
		return -EINVAL;
	}
	return 0;
}

static bool
nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
{
	return e->key && !memcmp(key, e->key, map->key_size);
}

static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
		if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
			return i;

	return -ENOENT;
}

static int
nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;

	nmap->entry[idx].key = kmalloc(offmap->map.key_size,
				       GFP_KERNEL_ACCOUNT | __GFP_NOWARN);
	if (!nmap->entry[idx].key)
		return -ENOMEM;
	nmap->entry[idx].value = kmalloc(offmap->map.value_size,
					 GFP_KERNEL_ACCOUNT | __GFP_NOWARN);
	if (!nmap->entry[idx].value) {
		kfree(nmap->entry[idx].key);
		nmap->entry[idx].key = NULL;
		return -ENOMEM;
	}

	return 0;
}

static int
nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
		      void *key, void *next_key)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	int idx = -ENOENT;

	mutex_lock(&nmap->mutex);

	if (key)
		idx = nsim_map_key_find(offmap, key);
	if (idx == -ENOENT)
		idx = 0;
	else
		idx++;

	for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
		if (nmap->entry[idx].key) {
			memcpy(next_key, nmap->entry[idx].key,
			       offmap->map.key_size);
			break;
		}
	}

	mutex_unlock(&nmap->mutex);

	if (idx == ARRAY_SIZE(nmap->entry))
		return -ENOENT;
	return 0;
}

static int
nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	int idx;

	mutex_lock(&nmap->mutex);

	idx = nsim_map_key_find(offmap, key);
	if (idx >= 0)
		memcpy(value, nmap->entry[idx].value, offmap->map.value_size);

	mutex_unlock(&nmap->mutex);

	return idx < 0 ? idx : 0;
}

static int
nsim_map_update_elem(struct bpf_offloaded_map *offmap,
		     void *key, void *value, u64 flags)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	int idx, err = 0;

	mutex_lock(&nmap->mutex);

	idx = nsim_map_key_find(offmap, key);
	if (idx < 0 && flags == BPF_EXIST) {
		err = idx;
		goto exit_unlock;
	}
	if (idx >= 0 && flags == BPF_NOEXIST) {
		err = -EEXIST;
		goto exit_unlock;
	}

	if (idx < 0) {
		for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
			if (!nmap->entry[idx].key)
				break;
		if (idx == ARRAY_SIZE(nmap->entry)) {
			err = -E2BIG;
			goto exit_unlock;
		}

		err = nsim_map_alloc_elem(offmap, idx);
		if (err)
			goto exit_unlock;
	}

	memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
	memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
exit_unlock:
	mutex_unlock(&nmap->mutex);

	return err;
}

static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	int idx;

	if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
		return -EINVAL;

	mutex_lock(&nmap->mutex);

	idx = nsim_map_key_find(offmap, key);
	if (idx >= 0) {
		kfree(nmap->entry[idx].key);
		kfree(nmap->entry[idx].value);
		memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
	}

	mutex_unlock(&nmap->mutex);

	return idx < 0 ? idx : 0;
}

static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
	.map_get_next_key	= nsim_map_get_next_key,
	.map_lookup_elem	= nsim_map_lookup_elem,
	.map_update_elem	= nsim_map_update_elem,
	.map_delete_elem	= nsim_map_delete_elem,
};

static int
nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
{
	struct nsim_bpf_bound_map *nmap;
	int i, err;

	if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
		    offmap->map.map_type != BPF_MAP_TYPE_HASH))
		return -EINVAL;
	if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
		return -ENOMEM;
	if (offmap->map.map_flags)
		return -EINVAL;

	nmap = kzalloc(sizeof(*nmap), GFP_KERNEL_ACCOUNT);
	if (!nmap)
		return -ENOMEM;

	offmap->dev_priv = nmap;
	nmap->ns = ns;
	nmap->map = offmap;
	mutex_init(&nmap->mutex);

	if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
		for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
			u32 *key;

			err = nsim_map_alloc_elem(offmap, i);
			if (err)
				goto err_free;
			key = nmap->entry[i].key;
			*key = i;
			memset(nmap->entry[i].value, 0, offmap->map.value_size);
		}
	}

	offmap->dev_ops = &nsim_bpf_map_ops;
	list_add_tail(&nmap->l, &ns->nsim_dev->bpf_bound_maps);

	return 0;

err_free:
	while (--i >= 0) {
		kfree(nmap->entry[i].key);
		kfree(nmap->entry[i].value);
	}
	kfree(nmap);
	return err;
}

static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
{
	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
		kfree(nmap->entry[i].key);
		kfree(nmap->entry[i].value);
	}
	list_del_init(&nmap->l);
	mutex_destroy(&nmap->mutex);
	kfree(nmap);
}

int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
{
	struct netdevsim *ns = netdev_priv(dev);
	int err;

	ASSERT_RTNL();

	switch (bpf->command) {
	case XDP_SETUP_PROG:
		err = nsim_setup_prog_checks(ns, bpf);
		if (err)
			return err;

		return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
	case XDP_SETUP_PROG_HW:
		err = nsim_setup_prog_hw_checks(ns, bpf);
		if (err)
			return err;

		return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
	case BPF_OFFLOAD_MAP_ALLOC:
		if (!ns->bpf_map_accept)
			return -EOPNOTSUPP;

		return nsim_bpf_map_alloc(ns, bpf->offmap);
	case BPF_OFFLOAD_MAP_FREE:
		nsim_bpf_map_free(bpf->offmap);
		return 0;
	default:
		return -EINVAL;
	}
}

int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
{
	int err;

	INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs);
	INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps);

	nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs",
							    nsim_dev->ddir);
	if (IS_ERR(nsim_dev->ddir_bpf_bound_progs))
		return PTR_ERR(nsim_dev->ddir_bpf_bound_progs);

	nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev);
	err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev);
	if (err)
		return err;

	nsim_dev->bpf_bind_accept = true;
	debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir,
			    &nsim_dev->bpf_bind_accept);
	debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir,
			   &nsim_dev->bpf_bind_verifier_delay);
	nsim_dev->bpf_bind_verifier_accept = true;
	debugfs_create_bool("bpf_bind_verifier_accept", 0600, nsim_dev->ddir,
			    &nsim_dev->bpf_bind_verifier_accept);
	return 0;
}

void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
{
	WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs));
	WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps));
	bpf_offload_dev_destroy(nsim_dev->bpf_dev);
}

int nsim_bpf_init(struct netdevsim *ns)
{
	struct dentry *ddir = ns->nsim_dev_port->ddir;
	int err;

	err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev,
					      ns->netdev);
	if (err)
		return err;

	debugfs_create_u32("bpf_offloaded_id", 0400, ddir,
			   &ns->bpf_offloaded_id);

	ns->bpf_tc_accept = true;
	debugfs_create_bool("bpf_tc_accept", 0600, ddir,
			    &ns->bpf_tc_accept);
	debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ddir,
			    &ns->bpf_tc_non_bound_accept);
	ns->bpf_xdpdrv_accept = true;
	debugfs_create_bool("bpf_xdpdrv_accept", 0600, ddir,
			    &ns->bpf_xdpdrv_accept);
	ns->bpf_xdpoffload_accept = true;
	debugfs_create_bool("bpf_xdpoffload_accept", 0600, ddir,
			    &ns->bpf_xdpoffload_accept);

	ns->bpf_map_accept = true;
	debugfs_create_bool("bpf_map_accept", 0600, ddir,
			    &ns->bpf_map_accept);

	return 0;
}

void nsim_bpf_uninit(struct netdevsim *ns)
{
	WARN_ON(ns->xdp.prog);
	WARN_ON(ns->xdp_hw.prog);
	WARN_ON(ns->bpf_offloaded);
	bpf_offload_dev_netdev_unregister(ns->nsim_dev->bpf_dev, ns->netdev);
}