drivers/net/netdevsim/bpf.c

   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_debugfs_bpf_string_read(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
  61 static int nsim_debugfs_bpf_string_open(struct inode *inode, struct file *f)
  62 {
  63         return single_open(f, nsim_debugfs_bpf_string_read, inode->i_private);
  64 }
  65
  66 static const struct file_operations nsim_bpf_string_fops = {
  67         .owner = THIS_MODULE,
  68         .open = nsim_debugfs_bpf_string_open,
  69         .release = single_release,
  70         .read = seq_read,
  71         .llseek = seq_lseek
  72 };
  73
  74 static int
  75 nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
  76 {
  77         struct nsim_bpf_bound_prog *state;
  78
  79         state = env->prog->aux->offload->dev_priv;
  80         if (state->ns->bpf_bind_verifier_delay && !insn_idx)
  81                 msleep(state->ns->bpf_bind_verifier_delay);
  82
  83         if (insn_idx == env->prog->len - 1)
  84                 pr_vlog(env, "Hello from netdevsim!\n");
  85
  86         return 0;
  87 }
  88
  89 static int nsim_bpf_finalize(struct bpf_verifier_env *env)
  90 {
  91         return 0;
  92 }
  93
  94 static const struct bpf_prog_offload_ops nsim_bpf_analyzer_ops = {
  95         .insn_hook      = nsim_bpf_verify_insn,
  96         .finalize       = nsim_bpf_finalize,
  97 };
  98
  99 static bool nsim_xdp_offload_active(struct netdevsim *ns)
 100 {
 101         return ns->xdp_hw.prog;
 102 }
 103
 104 static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
 105 {
 106         struct nsim_bpf_bound_prog *state;
 107
 108         if (!prog || !prog->aux->offload)
 109                 return;
 110
 111         state = prog->aux->offload->dev_priv;
 112         state->is_loaded = loaded;
 113 }
 114
 115 static int
 116 nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
 117 {
 118         nsim_prog_set_loaded(ns->bpf_offloaded, false);
 119
 120         WARN(!!ns->bpf_offloaded != oldprog,
 121              "bad offload state, expected offload %sto be active",
 122              oldprog ? "" : "not ");
 123         ns->bpf_offloaded = prog;
 124         ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
 125         nsim_prog_set_loaded(prog, true);
 126
 127         return 0;
 128 }
 129
 130 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 131                                void *type_data, void *cb_priv)
 132 {
 133         struct tc_cls_bpf_offload *cls_bpf = type_data;
 134         struct bpf_prog *prog = cls_bpf->prog;
 135         struct netdevsim *ns = cb_priv;
 136         struct bpf_prog *oldprog;
 137
 138         if (type != TC_SETUP_CLSBPF) {
 139                 NSIM_EA(cls_bpf->common.extack,
 140                         "only offload of BPF classifiers supported");
 141                 return -EOPNOTSUPP;
 142         }
 143
 144         if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 145                 return -EOPNOTSUPP;
 146
 147         if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
 148                 NSIM_EA(cls_bpf->common.extack,
 149                         "only ETH_P_ALL supported as filter protocol");
 150                 return -EOPNOTSUPP;
 151         }
 152
 153         if (!ns->bpf_tc_accept) {
 154                 NSIM_EA(cls_bpf->common.extack,
 155                         "netdevsim configured to reject BPF TC offload");
 156                 return -EOPNOTSUPP;
 157         }
 158         /* Note: progs without skip_sw will probably not be dev bound */
 159         if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
 160                 NSIM_EA(cls_bpf->common.extack,
 161                         "netdevsim configured to reject unbound programs");
 162                 return -EOPNOTSUPP;
 163         }
 164
 165         if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
 166                 return -EOPNOTSUPP;
 167
 168         oldprog = cls_bpf->oldprog;
 169
 170         /* Don't remove if oldprog doesn't match driver's state */
 171         if (ns->bpf_offloaded != oldprog) {
 172                 oldprog = NULL;
 173                 if (!cls_bpf->prog)
 174                         return 0;
 175                 if (ns->bpf_offloaded) {
 176                         NSIM_EA(cls_bpf->common.extack,
 177                                 "driver and netdev offload states mismatch");
 178                         return -EBUSY;
 179                 }
 180         }
 181
 182         return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
 183 }
 184
 185 int nsim_bpf_disable_tc(struct netdevsim *ns)
 186 {
 187         if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
 188                 return -EBUSY;
 189         return 0;
 190 }
 191
 192 static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 193 {
 194         if (!nsim_xdp_offload_active(ns) && !bpf->prog)
 195                 return 0;
 196         if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
 197                 NSIM_EA(bpf->extack, "TC program is already loaded");
 198                 return -EBUSY;
 199         }
 200
 201         return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
 202 }
 203
 204 static int
 205 nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
 206                   struct xdp_attachment_info *xdp)
 207 {
 208         int err;
 209
 210         if (!xdp_attachment_flags_ok(xdp, bpf))
 211                 return -EBUSY;
 212
 213         if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
 214                 NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
 215                 return -EOPNOTSUPP;
 216         }
 217         if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
 218                 NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
 219                 return -EOPNOTSUPP;
 220         }
 221
 222         if (bpf->command == XDP_SETUP_PROG_HW) {
 223                 err = nsim_xdp_offload_prog(ns, bpf);
 224                 if (err)
 225                         return err;
 226         }
 227
 228         xdp_attachment_setup(xdp, bpf);
 229
 230         return 0;
 231 }
 232
 233 static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 234 {
 235         struct nsim_bpf_bound_prog *state;
 236         char name[16];
 237
 238         state = kzalloc(sizeof(*state), GFP_KERNEL);
 239         if (!state)
 240                 return -ENOMEM;
 241
 242         state->ns = ns;
 243         state->prog = prog;
 244         state->state = "verify";
 245
 246         /* Program id is not populated yet when we create the state. */
 247         sprintf(name, "%u", ns->sdev->prog_id_gen++);
 248         state->ddir = debugfs_create_dir(name, ns->sdev->ddir_bpf_bound_progs);
 249         if (IS_ERR_OR_NULL(state->ddir)) {
 250                 kfree(state);
 251                 return -ENOMEM;
 252         }
 253
 254         debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
 255         debugfs_create_file("state", 0400, state->ddir,
 256                             &state->state, &nsim_bpf_string_fops);
 257         debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
 258
 259         list_add_tail(&state->l, &ns->sdev->bpf_bound_progs);
 260
 261         prog->aux->offload->dev_priv = state;
 262
 263         return 0;
 264 }
 265
 266 static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
 267 {
 268         struct nsim_bpf_bound_prog *state;
 269
 270         state = prog->aux->offload->dev_priv;
 271         WARN(state->is_loaded,
 272              "offload state destroyed while program still bound");
 273         debugfs_remove_recursive(state->ddir);
 274         list_del(&state->l);
 275         kfree(state);
 276 }
 277
 278 static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 279 {
 280         if (bpf->prog && bpf->prog->aux->offload) {
 281                 NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
 282                 return -EINVAL;
 283         }
 284         if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
 285                 NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
 286                 return -EINVAL;
 287         }
 288         return 0;
 289 }
 290
 291 static int
 292 nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 293 {
 294         struct nsim_bpf_bound_prog *state;
 295
 296         if (!bpf->prog)
 297                 return 0;
 298
 299         if (!bpf->prog->aux->offload) {
 300                 NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
 301                 return -EINVAL;
 302         }
 303         if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
 304                 NSIM_EA(bpf->extack, "program bound to different dev");
 305                 return -EINVAL;
 306         }
 307
 308         state = bpf->prog->aux->offload->dev_priv;
 309         if (WARN_ON(strcmp(state->state, "xlated"))) {
 310                 NSIM_EA(bpf->extack, "offloading program in bad state");
 311                 return -EINVAL;
 312         }
 313         return 0;
 314 }
 315
 316 static bool
 317 nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
 318 {
 319         return e->key && !memcmp(key, e->key, map->key_size);
 320 }
 321
 322 static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
 323 {
 324         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 325         unsigned int i;
 326
 327         for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
 328                 if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
 329                         return i;
 330
 331         return -ENOENT;
 332 }
 333
 334 static int
 335 nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
 336 {
 337         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 338
 339         nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
 340         if (!nmap->entry[idx].key)
 341                 return -ENOMEM;
 342         nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
 343         if (!nmap->entry[idx].value) {
 344                 kfree(nmap->entry[idx].key);
 345                 nmap->entry[idx].key = NULL;
 346                 return -ENOMEM;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static int
 353 nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
 354                       void *key, void *next_key)
 355 {
 356         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 357         int idx = -ENOENT;
 358
 359         mutex_lock(&nmap->mutex);
 360
 361         if (key)
 362                 idx = nsim_map_key_find(offmap, key);
 363         if (idx == -ENOENT)
 364                 idx = 0;
 365         else
 366                 idx++;
 367
 368         for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
 369                 if (nmap->entry[idx].key) {
 370                         memcpy(next_key, nmap->entry[idx].key,
 371                                offmap->map.key_size);
 372                         break;
 373                 }
 374         }
 375
 376         mutex_unlock(&nmap->mutex);
 377
 378         if (idx == ARRAY_SIZE(nmap->entry))
 379                 return -ENOENT;
 380         return 0;
 381 }
 382
 383 static int
 384 nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
 385 {
 386         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 387         int idx;
 388
 389         mutex_lock(&nmap->mutex);
 390
 391         idx = nsim_map_key_find(offmap, key);
 392         if (idx >= 0)
 393                 memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
 394
 395         mutex_unlock(&nmap->mutex);
 396
 397         return idx < 0 ? idx : 0;
 398 }
 399
 400 static int
 401 nsim_map_update_elem(struct bpf_offloaded_map *offmap,
 402                      void *key, void *value, u64 flags)
 403 {
 404         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 405         int idx, err = 0;
 406
 407         mutex_lock(&nmap->mutex);
 408
 409         idx = nsim_map_key_find(offmap, key);
 410         if (idx < 0 && flags == BPF_EXIST) {
 411                 err = idx;
 412                 goto exit_unlock;
 413         }
 414         if (idx >= 0 && flags == BPF_NOEXIST) {
 415                 err = -EEXIST;
 416                 goto exit_unlock;
 417         }
 418
 419         if (idx < 0) {
 420                 for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
 421                         if (!nmap->entry[idx].key)
 422                                 break;
 423                 if (idx == ARRAY_SIZE(nmap->entry)) {
 424                         err = -E2BIG;
 425                         goto exit_unlock;
 426                 }
 427
 428                 err = nsim_map_alloc_elem(offmap, idx);
 429                 if (err)
 430                         goto exit_unlock;
 431         }
 432
 433         memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
 434         memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
 435 exit_unlock:
 436         mutex_unlock(&nmap->mutex);
 437
 438         return err;
 439 }
 440
 441 static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
 442 {
 443         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 444         int idx;
 445
 446         if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
 447                 return -EINVAL;
 448
 449         mutex_lock(&nmap->mutex);
 450
 451         idx = nsim_map_key_find(offmap, key);
 452         if (idx >= 0) {
 453                 kfree(nmap->entry[idx].key);
 454                 kfree(nmap->entry[idx].value);
 455                 memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
 456         }
 457
 458         mutex_unlock(&nmap->mutex);
 459
 460         return idx < 0 ? idx : 0;
 461 }
 462
 463 static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
 464         .map_get_next_key       = nsim_map_get_next_key,
 465         .map_lookup_elem        = nsim_map_lookup_elem,
 466         .map_update_elem        = nsim_map_update_elem,
 467         .map_delete_elem        = nsim_map_delete_elem,
 468 };
 469
 470 static int
 471 nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
 472 {
 473         struct nsim_bpf_bound_map *nmap;
 474         int i, err;
 475
 476         if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
 477                     offmap->map.map_type != BPF_MAP_TYPE_HASH))
 478                 return -EINVAL;
 479         if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
 480                 return -ENOMEM;
 481         if (offmap->map.map_flags)
 482                 return -EINVAL;
 483
 484         nmap = kzalloc(sizeof(*nmap), GFP_USER);
 485         if (!nmap)
 486                 return -ENOMEM;
 487
 488         offmap->dev_priv = nmap;
 489         nmap->ns = ns;
 490         nmap->map = offmap;
 491         mutex_init(&nmap->mutex);
 492
 493         if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
 494                 for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 495                         u32 *key;
 496
 497                         err = nsim_map_alloc_elem(offmap, i);
 498                         if (err)
 499                                 goto err_free;
 500                         key = nmap->entry[i].key;
 501                         *key = i;
 502                 }
 503         }
 504
 505         offmap->dev_ops = &nsim_bpf_map_ops;
 506         list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);
 507
 508         return 0;
 509
 510 err_free:
 511         while (--i >= 0) {
 512                 kfree(nmap->entry[i].key);
 513                 kfree(nmap->entry[i].value);
 514         }
 515         kfree(nmap);
 516         return err;
 517 }
 518
 519 static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
 520 {
 521         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 522         unsigned int i;
 523
 524         for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 525                 kfree(nmap->entry[i].key);
 526                 kfree(nmap->entry[i].value);
 527         }
 528         list_del_init(&nmap->l);
 529         mutex_destroy(&nmap->mutex);
 530         kfree(nmap);
 531 }
 532
 533 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 534 {
 535         struct netdevsim *ns = netdev_priv(dev);
 536         struct nsim_bpf_bound_prog *state;
 537         int err;
 538
 539         ASSERT_RTNL();
 540
 541         switch (bpf->command) {
 542         case BPF_OFFLOAD_VERIFIER_PREP:
 543                 if (!ns->bpf_bind_accept)
 544                         return -EOPNOTSUPP;
 545
 546                 err = nsim_bpf_create_prog(ns, bpf->verifier.prog);
 547                 if (err)
 548                         return err;
 549
 550                 bpf->verifier.ops = &nsim_bpf_analyzer_ops;
 551                 return 0;
 552         case BPF_OFFLOAD_TRANSLATE:
 553                 state = bpf->offload.prog->aux->offload->dev_priv;
 554
 555                 state->state = "xlated";
 556                 return 0;
 557         case BPF_OFFLOAD_DESTROY:
 558                 nsim_bpf_destroy_prog(bpf->offload.prog);
 559                 return 0;
 560         case XDP_QUERY_PROG:
 561                 return xdp_attachment_query(&ns->xdp, bpf);
 562         case XDP_QUERY_PROG_HW:
 563                 return xdp_attachment_query(&ns->xdp_hw, bpf);
 564         case XDP_SETUP_PROG:
 565                 err = nsim_setup_prog_checks(ns, bpf);
 566                 if (err)
 567                         return err;
 568
 569                 return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
 570         case XDP_SETUP_PROG_HW:
 571                 err = nsim_setup_prog_hw_checks(ns, bpf);
 572                 if (err)
 573                         return err;
 574
 575                 return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
 576         case BPF_OFFLOAD_MAP_ALLOC:
 577                 if (!ns->bpf_map_accept)
 578                         return -EOPNOTSUPP;
 579
 580                 return nsim_bpf_map_alloc(ns, bpf->offmap);
 581         case BPF_OFFLOAD_MAP_FREE:
 582                 nsim_bpf_map_free(bpf->offmap);
 583                 return 0;
 584         default:
 585                 return -EINVAL;
 586         }
 587 }
 588
 589 int nsim_bpf_init(struct netdevsim *ns)
 590 {
 591         int err;
 592
 593         if (ns->sdev->refcnt == 1) {
 594                 INIT_LIST_HEAD(&ns->sdev->bpf_bound_progs);
 595                 INIT_LIST_HEAD(&ns->sdev->bpf_bound_maps);
 596
 597                 ns->sdev->ddir_bpf_bound_progs =
 598                         debugfs_create_dir("bpf_bound_progs", ns->sdev->ddir);
 599                 if (IS_ERR_OR_NULL(ns->sdev->ddir_bpf_bound_progs))
 600                         return -ENOMEM;
 601
 602                 ns->sdev->bpf_dev = bpf_offload_dev_create();
 603                 err = PTR_ERR_OR_ZERO(ns->sdev->bpf_dev);
 604                 if (err)
 605                         return err;
 606         }
 607
 608         err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
 609         if (err)
 610                 goto err_destroy_bdev;
 611
 612         debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
 613                            &ns->bpf_offloaded_id);
 614
 615         ns->bpf_bind_accept = true;
 616         debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
 617                             &ns->bpf_bind_accept);
 618         debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
 619                            &ns->bpf_bind_verifier_delay);
 620
 621         ns->bpf_tc_accept = true;
 622         debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
 623                             &ns->bpf_tc_accept);
 624         debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
 625                             &ns->bpf_tc_non_bound_accept);
 626         ns->bpf_xdpdrv_accept = true;
 627         debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
 628                             &ns->bpf_xdpdrv_accept);
 629         ns->bpf_xdpoffload_accept = true;
 630         debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
 631                             &ns->bpf_xdpoffload_accept);
 632
 633         ns->bpf_map_accept = true;
 634         debugfs_create_bool("bpf_map_accept", 0600, ns->ddir,
 635                             &ns->bpf_map_accept);
 636
 637         return 0;
 638
 639 err_destroy_bdev:
 640         if (ns->sdev->refcnt == 1)
 641                 bpf_offload_dev_destroy(ns->sdev->bpf_dev);
 642         return err;
 643 }
 644
 645 void nsim_bpf_uninit(struct netdevsim *ns)
 646 {
 647         WARN_ON(ns->xdp.prog);
 648         WARN_ON(ns->xdp_hw.prog);
 649         WARN_ON(ns->bpf_offloaded);
 650         bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
 651
 652         if (ns->sdev->refcnt == 1) {
 653                 WARN_ON(!list_empty(&ns->sdev->bpf_bound_progs));
 654                 WARN_ON(!list_empty(&ns->sdev->bpf_bound_maps));
 655                 bpf_offload_dev_destroy(ns->sdev->bpf_dev);
 656         }
 657 }