xref: /linux/drivers/net/netdevsim/bpf.c (revision d4ce5458ea1b7d8ca49c436d602095c4912777d3) 
1 /*
2  * Copyright (C) 2017 Netronome Systems, Inc.
3  *
4  * This software is licensed under the GNU General License Version 2,
5  * June 1991 as shown in the file COPYING in the top-level directory of this
6  * source tree.
7  *
8  * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
9  * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
10  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
11  * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
12  * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
13  * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
14  */
15 
16 #include <linux/bpf.h>
17 #include <linux/bpf_verifier.h>
18 #include <linux/debugfs.h>
19 #include <linux/kernel.h>
20 #include <linux/mutex.h>
21 #include <linux/rtnetlink.h>
22 #include <net/pkt_cls.h>
23 
24 #include "netdevsim.h"
25 
26 #define pr_vlog(env, fmt, ...)	\
27 	bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__)
28 
29 struct nsim_bpf_bound_prog {
30 	struct netdevsim *ns;
31 	struct bpf_prog *prog;
32 	struct dentry *ddir;
33 	const char *state;
34 	bool is_loaded;
35 	struct list_head l;
36 };
37 
38 #define NSIM_BPF_MAX_KEYS		2
39 
40 struct nsim_bpf_bound_map {
41 	struct netdevsim *ns;
42 	struct bpf_offloaded_map *map;
43 	struct mutex mutex;
44 	struct nsim_map_entry {
45 		void *key;
46 		void *value;
47 	} entry[NSIM_BPF_MAX_KEYS];
48 	struct list_head l;
49 };
50 
51 static int nsim_bpf_string_show(struct seq_file *file, void *data)
52 {
53 	const char **str = file->private;
54 
55 	if (*str)
56 		seq_printf(file, "%s\n", *str);
57 
58 	return 0;
59 }
60 DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string);
61 
62 static int
63 nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
64 {
65 	struct nsim_bpf_bound_prog *state;
66 
67 	state = env->prog->aux->offload->dev_priv;
68 	if (state->ns->bpf_bind_verifier_delay && !insn_idx)
69 		msleep(state->ns->bpf_bind_verifier_delay);
70 
71 	if (insn_idx == env->prog->len - 1)
72 		pr_vlog(env, "Hello from netdevsim!\n");
73 
74 	return 0;
75 }
76 
77 static int nsim_bpf_finalize(struct bpf_verifier_env *env)
78 {
79 	return 0;
80 }
81 
82 static bool nsim_xdp_offload_active(struct netdevsim *ns)
83 {
84 	return ns->xdp_hw.prog;
85 }
86 
87 static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
88 {
89 	struct nsim_bpf_bound_prog *state;
90 
91 	if (!prog || !prog->aux->offload)
92 		return;
93 
94 	state = prog->aux->offload->dev_priv;
95 	state->is_loaded = loaded;
96 }
97 
98 static int
99 nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
100 {
101 	nsim_prog_set_loaded(ns->bpf_offloaded, false);
102 
103 	WARN(!!ns->bpf_offloaded != oldprog,
104 	     "bad offload state, expected offload %sto be active",
105 	     oldprog ? "" : "not ");
106 	ns->bpf_offloaded = prog;
107 	ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
108 	nsim_prog_set_loaded(prog, true);
109 
110 	return 0;
111 }
112 
113 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
114 			       void *type_data, void *cb_priv)
115 {
116 	struct tc_cls_bpf_offload *cls_bpf = type_data;
117 	struct bpf_prog *prog = cls_bpf->prog;
118 	struct netdevsim *ns = cb_priv;
119 	struct bpf_prog *oldprog;
120 
121 	if (type != TC_SETUP_CLSBPF) {
122 		NSIM_EA(cls_bpf->common.extack,
123 			"only offload of BPF classifiers supported");
124 		return -EOPNOTSUPP;
125 	}
126 
127 	if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
128 		return -EOPNOTSUPP;
129 
130 	if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
131 		NSIM_EA(cls_bpf->common.extack,
132 			"only ETH_P_ALL supported as filter protocol");
133 		return -EOPNOTSUPP;
134 	}
135 
136 	if (!ns->bpf_tc_accept) {
137 		NSIM_EA(cls_bpf->common.extack,
138 			"netdevsim configured to reject BPF TC offload");
139 		return -EOPNOTSUPP;
140 	}
141 	/* Note: progs without skip_sw will probably not be dev bound */
142 	if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
143 		NSIM_EA(cls_bpf->common.extack,
144 			"netdevsim configured to reject unbound programs");
145 		return -EOPNOTSUPP;
146 	}
147 
148 	if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
149 		return -EOPNOTSUPP;
150 
151 	oldprog = cls_bpf->oldprog;
152 
153 	/* Don't remove if oldprog doesn't match driver's state */
154 	if (ns->bpf_offloaded != oldprog) {
155 		oldprog = NULL;
156 		if (!cls_bpf->prog)
157 			return 0;
158 		if (ns->bpf_offloaded) {
159 			NSIM_EA(cls_bpf->common.extack,
160 				"driver and netdev offload states mismatch");
161 			return -EBUSY;
162 		}
163 	}
164 
165 	return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
166 }
167 
168 int nsim_bpf_disable_tc(struct netdevsim *ns)
169 {
170 	if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
171 		return -EBUSY;
172 	return 0;
173 }
174 
175 static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
176 {
177 	if (!nsim_xdp_offload_active(ns) && !bpf->prog)
178 		return 0;
179 	if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
180 		NSIM_EA(bpf->extack, "TC program is already loaded");
181 		return -EBUSY;
182 	}
183 
184 	return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
185 }
186 
187 static int
188 nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
189 		  struct xdp_attachment_info *xdp)
190 {
191 	int err;
192 
193 	if (!xdp_attachment_flags_ok(xdp, bpf))
194 		return -EBUSY;
195 
196 	if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
197 		NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
198 		return -EOPNOTSUPP;
199 	}
200 	if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
201 		NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
202 		return -EOPNOTSUPP;
203 	}
204 
205 	if (bpf->command == XDP_SETUP_PROG_HW) {
206 		err = nsim_xdp_offload_prog(ns, bpf);
207 		if (err)
208 			return err;
209 	}
210 
211 	xdp_attachment_setup(xdp, bpf);
212 
213 	return 0;
214 }
215 
216 static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
217 {
218 	struct nsim_bpf_bound_prog *state;
219 	char name[16];
220 
221 	state = kzalloc(sizeof(*state), GFP_KERNEL);
222 	if (!state)
223 		return -ENOMEM;
224 
225 	state->ns = ns;
226 	state->prog = prog;
227 	state->state = "verify";
228 
229 	/* Program id is not populated yet when we create the state. */
230 	sprintf(name, "%u", ns->sdev->prog_id_gen++);
231 	state->ddir = debugfs_create_dir(name, ns->sdev->ddir_bpf_bound_progs);
232 	if (IS_ERR_OR_NULL(state->ddir)) {
233 		kfree(state);
234 		return -ENOMEM;
235 	}
236 
237 	debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
238 	debugfs_create_file("state", 0400, state->ddir,
239 			    &state->state, &nsim_bpf_string_fops);
240 	debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
241 
242 	list_add_tail(&state->l, &ns->sdev->bpf_bound_progs);
243 
244 	prog->aux->offload->dev_priv = state;
245 
246 	return 0;
247 }
248 
249 static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
250 {
251 	struct netdevsim *ns = netdev_priv(prog->aux->offload->netdev);
252 
253 	if (!ns->bpf_bind_accept)
254 		return -EOPNOTSUPP;
255 
256 	return nsim_bpf_create_prog(ns, prog);
257 }
258 
259 static int nsim_bpf_translate(struct bpf_prog *prog)
260 {
261 	struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;
262 
263 	state->state = "xlated";
264 	return 0;
265 }
266 
267 static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
268 {
269 	struct nsim_bpf_bound_prog *state;
270 
271 	state = prog->aux->offload->dev_priv;
272 	WARN(state->is_loaded,
273 	     "offload state destroyed while program still bound");
274 	debugfs_remove_recursive(state->ddir);
275 	list_del(&state->l);
276 	kfree(state);
277 }
278 
279 static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = {
280 	.insn_hook	= nsim_bpf_verify_insn,
281 	.finalize	= nsim_bpf_finalize,
282 	.prepare	= nsim_bpf_verifier_prep,
283 	.translate	= nsim_bpf_translate,
284 	.destroy	= nsim_bpf_destroy_prog,
285 };
286 
287 static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
288 {
289 	if (bpf->prog && bpf->prog->aux->offload) {
290 		NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
291 		return -EINVAL;
292 	}
293 	if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
294 		NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
295 		return -EINVAL;
296 	}
297 	return 0;
298 }
299 
300 static int
301 nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
302 {
303 	struct nsim_bpf_bound_prog *state;
304 
305 	if (!bpf->prog)
306 		return 0;
307 
308 	if (!bpf->prog->aux->offload) {
309 		NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
310 		return -EINVAL;
311 	}
312 	if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
313 		NSIM_EA(bpf->extack, "program bound to different dev");
314 		return -EINVAL;
315 	}
316 
317 	state = bpf->prog->aux->offload->dev_priv;
318 	if (WARN_ON(strcmp(state->state, "xlated"))) {
319 		NSIM_EA(bpf->extack, "offloading program in bad state");
320 		return -EINVAL;
321 	}
322 	return 0;
323 }
324 
325 static bool
326 nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
327 {
328 	return e->key && !memcmp(key, e->key, map->key_size);
329 }
330 
331 static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
332 {
333 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
334 	unsigned int i;
335 
336 	for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
337 		if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
338 			return i;
339 
340 	return -ENOENT;
341 }
342 
343 static int
344 nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
345 {
346 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
347 
348 	nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
349 	if (!nmap->entry[idx].key)
350 		return -ENOMEM;
351 	nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
352 	if (!nmap->entry[idx].value) {
353 		kfree(nmap->entry[idx].key);
354 		nmap->entry[idx].key = NULL;
355 		return -ENOMEM;
356 	}
357 
358 	return 0;
359 }
360 
361 static int
362 nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
363 		      void *key, void *next_key)
364 {
365 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
366 	int idx = -ENOENT;
367 
368 	mutex_lock(&nmap->mutex);
369 
370 	if (key)
371 		idx = nsim_map_key_find(offmap, key);
372 	if (idx == -ENOENT)
373 		idx = 0;
374 	else
375 		idx++;
376 
377 	for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
378 		if (nmap->entry[idx].key) {
379 			memcpy(next_key, nmap->entry[idx].key,
380 			       offmap->map.key_size);
381 			break;
382 		}
383 	}
384 
385 	mutex_unlock(&nmap->mutex);
386 
387 	if (idx == ARRAY_SIZE(nmap->entry))
388 		return -ENOENT;
389 	return 0;
390 }
391 
392 static int
393 nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
394 {
395 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
396 	int idx;
397 
398 	mutex_lock(&nmap->mutex);
399 
400 	idx = nsim_map_key_find(offmap, key);
401 	if (idx >= 0)
402 		memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
403 
404 	mutex_unlock(&nmap->mutex);
405 
406 	return idx < 0 ? idx : 0;
407 }
408 
409 static int
410 nsim_map_update_elem(struct bpf_offloaded_map *offmap,
411 		     void *key, void *value, u64 flags)
412 {
413 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
414 	int idx, err = 0;
415 
416 	mutex_lock(&nmap->mutex);
417 
418 	idx = nsim_map_key_find(offmap, key);
419 	if (idx < 0 && flags == BPF_EXIST) {
420 		err = idx;
421 		goto exit_unlock;
422 	}
423 	if (idx >= 0 && flags == BPF_NOEXIST) {
424 		err = -EEXIST;
425 		goto exit_unlock;
426 	}
427 
428 	if (idx < 0) {
429 		for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
430 			if (!nmap->entry[idx].key)
431 				break;
432 		if (idx == ARRAY_SIZE(nmap->entry)) {
433 			err = -E2BIG;
434 			goto exit_unlock;
435 		}
436 
437 		err = nsim_map_alloc_elem(offmap, idx);
438 		if (err)
439 			goto exit_unlock;
440 	}
441 
442 	memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
443 	memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
444 exit_unlock:
445 	mutex_unlock(&nmap->mutex);
446 
447 	return err;
448 }
449 
450 static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
451 {
452 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
453 	int idx;
454 
455 	if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
456 		return -EINVAL;
457 
458 	mutex_lock(&nmap->mutex);
459 
460 	idx = nsim_map_key_find(offmap, key);
461 	if (idx >= 0) {
462 		kfree(nmap->entry[idx].key);
463 		kfree(nmap->entry[idx].value);
464 		memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
465 	}
466 
467 	mutex_unlock(&nmap->mutex);
468 
469 	return idx < 0 ? idx : 0;
470 }
471 
472 static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
473 	.map_get_next_key	= nsim_map_get_next_key,
474 	.map_lookup_elem	= nsim_map_lookup_elem,
475 	.map_update_elem	= nsim_map_update_elem,
476 	.map_delete_elem	= nsim_map_delete_elem,
477 };
478 
479 static int
480 nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
481 {
482 	struct nsim_bpf_bound_map *nmap;
483 	int i, err;
484 
485 	if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
486 		    offmap->map.map_type != BPF_MAP_TYPE_HASH))
487 		return -EINVAL;
488 	if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
489 		return -ENOMEM;
490 	if (offmap->map.map_flags)
491 		return -EINVAL;
492 
493 	nmap = kzalloc(sizeof(*nmap), GFP_USER);
494 	if (!nmap)
495 		return -ENOMEM;
496 
497 	offmap->dev_priv = nmap;
498 	nmap->ns = ns;
499 	nmap->map = offmap;
500 	mutex_init(&nmap->mutex);
501 
502 	if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
503 		for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
504 			u32 *key;
505 
506 			err = nsim_map_alloc_elem(offmap, i);
507 			if (err)
508 				goto err_free;
509 			key = nmap->entry[i].key;
510 			*key = i;
511 		}
512 	}
513 
514 	offmap->dev_ops = &nsim_bpf_map_ops;
515 	list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);
516 
517 	return 0;
518 
519 err_free:
520 	while (--i >= 0) {
521 		kfree(nmap->entry[i].key);
522 		kfree(nmap->entry[i].value);
523 	}
524 	kfree(nmap);
525 	return err;
526 }
527 
528 static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
529 {
530 	struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
531 	unsigned int i;
532 
533 	for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
534 		kfree(nmap->entry[i].key);
535 		kfree(nmap->entry[i].value);
536 	}
537 	list_del_init(&nmap->l);
538 	mutex_destroy(&nmap->mutex);
539 	kfree(nmap);
540 }
541 
542 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
543 {
544 	struct netdevsim *ns = netdev_priv(dev);
545 	int err;
546 
547 	ASSERT_RTNL();
548 
549 	switch (bpf->command) {
550 	case XDP_QUERY_PROG:
551 		return xdp_attachment_query(&ns->xdp, bpf);
552 	case XDP_QUERY_PROG_HW:
553 		return xdp_attachment_query(&ns->xdp_hw, bpf);
554 	case XDP_SETUP_PROG:
555 		err = nsim_setup_prog_checks(ns, bpf);
556 		if (err)
557 			return err;
558 
559 		return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
560 	case XDP_SETUP_PROG_HW:
561 		err = nsim_setup_prog_hw_checks(ns, bpf);
562 		if (err)
563 			return err;
564 
565 		return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
566 	case BPF_OFFLOAD_MAP_ALLOC:
567 		if (!ns->bpf_map_accept)
568 			return -EOPNOTSUPP;
569 
570 		return nsim_bpf_map_alloc(ns, bpf->offmap);
571 	case BPF_OFFLOAD_MAP_FREE:
572 		nsim_bpf_map_free(bpf->offmap);
573 		return 0;
574 	default:
575 		return -EINVAL;
576 	}
577 }
578 
579 int nsim_bpf_init(struct netdevsim *ns)
580 {
581 	int err;
582 
583 	if (ns->sdev->refcnt == 1) {
584 		INIT_LIST_HEAD(&ns->sdev->bpf_bound_progs);
585 		INIT_LIST_HEAD(&ns->sdev->bpf_bound_maps);
586 
587 		ns->sdev->ddir_bpf_bound_progs =
588 			debugfs_create_dir("bpf_bound_progs", ns->sdev->ddir);
589 		if (IS_ERR_OR_NULL(ns->sdev->ddir_bpf_bound_progs))
590 			return -ENOMEM;
591 
592 		ns->sdev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops);
593 		err = PTR_ERR_OR_ZERO(ns->sdev->bpf_dev);
594 		if (err)
595 			return err;
596 	}
597 
598 	err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
599 	if (err)
600 		goto err_destroy_bdev;
601 
602 	debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
603 			   &ns->bpf_offloaded_id);
604 
605 	ns->bpf_bind_accept = true;
606 	debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
607 			    &ns->bpf_bind_accept);
608 	debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
609 			   &ns->bpf_bind_verifier_delay);
610 
611 	ns->bpf_tc_accept = true;
612 	debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
613 			    &ns->bpf_tc_accept);
614 	debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
615 			    &ns->bpf_tc_non_bound_accept);
616 	ns->bpf_xdpdrv_accept = true;
617 	debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
618 			    &ns->bpf_xdpdrv_accept);
619 	ns->bpf_xdpoffload_accept = true;
620 	debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
621 			    &ns->bpf_xdpoffload_accept);
622 
623 	ns->bpf_map_accept = true;
624 	debugfs_create_bool("bpf_map_accept", 0600, ns->ddir,
625 			    &ns->bpf_map_accept);
626 
627 	return 0;
628 
629 err_destroy_bdev:
630 	if (ns->sdev->refcnt == 1)
631 		bpf_offload_dev_destroy(ns->sdev->bpf_dev);
632 	return err;
633 }
634 
635 void nsim_bpf_uninit(struct netdevsim *ns)
636 {
637 	WARN_ON(ns->xdp.prog);
638 	WARN_ON(ns->xdp_hw.prog);
639 	WARN_ON(ns->bpf_offloaded);
640 	bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
641 
642 	if (ns->sdev->refcnt == 1) {
643 		WARN_ON(!list_empty(&ns->sdev->bpf_bound_progs));
644 		WARN_ON(!list_empty(&ns->sdev->bpf_bound_maps));
645 		bpf_offload_dev_destroy(ns->sdev->bpf_dev);
646 	}
647 }
648