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 bool nsim_xdp_offload_active(struct netdevsim *ns)
  95 {
  96         return ns->xdp_hw.prog;
  97 }
  98
  99 static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
 100 {
 101         struct nsim_bpf_bound_prog *state;
 102
 103         if (!prog || !prog->aux->offload)
 104                 return;
 105
 106         state = prog->aux->offload->dev_priv;
 107         state->is_loaded = loaded;
 108 }
 109
 110 static int
 111 nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
 112 {
 113         nsim_prog_set_loaded(ns->bpf_offloaded, false);
 114
 115         WARN(!!ns->bpf_offloaded != oldprog,
 116              "bad offload state, expected offload %sto be active",
 117              oldprog ? "" : "not ");
 118         ns->bpf_offloaded = prog;
 119         ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
 120         nsim_prog_set_loaded(prog, true);
 121
 122         return 0;
 123 }
 124
 125 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 126                                void *type_data, void *cb_priv)
 127 {
 128         struct tc_cls_bpf_offload *cls_bpf = type_data;
 129         struct bpf_prog *prog = cls_bpf->prog;
 130         struct netdevsim *ns = cb_priv;
 131         struct bpf_prog *oldprog;
 132
 133         if (type != TC_SETUP_CLSBPF) {
 134                 NSIM_EA(cls_bpf->common.extack,
 135                         "only offload of BPF classifiers supported");
 136                 return -EOPNOTSUPP;
 137         }
 138
 139         if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 140                 return -EOPNOTSUPP;
 141
 142         if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
 143                 NSIM_EA(cls_bpf->common.extack,
 144                         "only ETH_P_ALL supported as filter protocol");
 145                 return -EOPNOTSUPP;
 146         }
 147
 148         if (!ns->bpf_tc_accept) {
 149                 NSIM_EA(cls_bpf->common.extack,
 150                         "netdevsim configured to reject BPF TC offload");
 151                 return -EOPNOTSUPP;
 152         }
 153         /* Note: progs without skip_sw will probably not be dev bound */
 154         if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
 155                 NSIM_EA(cls_bpf->common.extack,
 156                         "netdevsim configured to reject unbound programs");
 157                 return -EOPNOTSUPP;
 158         }
 159
 160         if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
 161                 return -EOPNOTSUPP;
 162
 163         oldprog = cls_bpf->oldprog;
 164
 165         /* Don't remove if oldprog doesn't match driver's state */
 166         if (ns->bpf_offloaded != oldprog) {
 167                 oldprog = NULL;
 168                 if (!cls_bpf->prog)
 169                         return 0;
 170                 if (ns->bpf_offloaded) {
 171                         NSIM_EA(cls_bpf->common.extack,
 172                                 "driver and netdev offload states mismatch");
 173                         return -EBUSY;
 174                 }
 175         }
 176
 177         return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
 178 }
 179
 180 int nsim_bpf_disable_tc(struct netdevsim *ns)
 181 {
 182         if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
 183                 return -EBUSY;
 184         return 0;
 185 }
 186
 187 static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 188 {
 189         if (!nsim_xdp_offload_active(ns) && !bpf->prog)
 190                 return 0;
 191         if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
 192                 NSIM_EA(bpf->extack, "TC program is already loaded");
 193                 return -EBUSY;
 194         }
 195
 196         return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
 197 }
 198
 199 static int
 200 nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
 201                   struct xdp_attachment_info *xdp)
 202 {
 203         int err;
 204
 205         if (!xdp_attachment_flags_ok(xdp, bpf))
 206                 return -EBUSY;
 207
 208         if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
 209                 NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
 210                 return -EOPNOTSUPP;
 211         }
 212         if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
 213                 NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
 214                 return -EOPNOTSUPP;
 215         }
 216
 217         if (bpf->command == XDP_SETUP_PROG_HW) {
 218                 err = nsim_xdp_offload_prog(ns, bpf);
 219                 if (err)
 220                         return err;
 221         }
 222
 223         xdp_attachment_setup(xdp, bpf);
 224
 225         return 0;
 226 }
 227
 228 static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 229 {
 230         struct nsim_bpf_bound_prog *state;
 231         char name[16];
 232
 233         state = kzalloc(sizeof(*state), GFP_KERNEL);
 234         if (!state)
 235                 return -ENOMEM;
 236
 237         state->ns = ns;
 238         state->prog = prog;
 239         state->state = "verify";
 240
 241         /* Program id is not populated yet when we create the state. */
 242         sprintf(name, "%u", ns->sdev->prog_id_gen++);
 243         state->ddir = debugfs_create_dir(name, ns->sdev->ddir_bpf_bound_progs);
 244         if (IS_ERR_OR_NULL(state->ddir)) {
 245                 kfree(state);
 246                 return -ENOMEM;
 247         }
 248
 249         debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
 250         debugfs_create_file("state", 0400, state->ddir,
 251                             &state->state, &nsim_bpf_string_fops);
 252         debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
 253
 254         list_add_tail(&state->l, &ns->sdev->bpf_bound_progs);
 255
 256         prog->aux->offload->dev_priv = state;
 257
 258         return 0;
 259 }
 260
 261 static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
 262 {
 263         struct netdevsim *ns = netdev_priv(prog->aux->offload->netdev);
 264
 265         if (!ns->bpf_bind_accept)
 266                 return -EOPNOTSUPP;
 267
 268         return nsim_bpf_create_prog(ns, prog);
 269 }
 270
 271 static int nsim_bpf_translate(struct bpf_prog *prog)
 272 {
 273         struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;
 274
 275         state->state = "xlated";
 276         return 0;
 277 }
 278
 279 static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
 280 {
 281         struct nsim_bpf_bound_prog *state;
 282
 283         state = prog->aux->offload->dev_priv;
 284         WARN(state->is_loaded,
 285              "offload state destroyed while program still bound");
 286         debugfs_remove_recursive(state->ddir);
 287         list_del(&state->l);
 288         kfree(state);
 289 }
 290
 291 static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = {
 292         .insn_hook      = nsim_bpf_verify_insn,
 293         .finalize       = nsim_bpf_finalize,
 294         .prepare        = nsim_bpf_verifier_prep,
 295         .translate      = nsim_bpf_translate,
 296         .destroy        = nsim_bpf_destroy_prog,
 297 };
 298
 299 static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 300 {
 301         if (bpf->prog && bpf->prog->aux->offload) {
 302                 NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
 303                 return -EINVAL;
 304         }
 305         if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
 306                 NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
 307                 return -EINVAL;
 308         }
 309         return 0;
 310 }
 311
 312 static int
 313 nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 314 {
 315         struct nsim_bpf_bound_prog *state;
 316
 317         if (!bpf->prog)
 318                 return 0;
 319
 320         if (!bpf->prog->aux->offload) {
 321                 NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
 322                 return -EINVAL;
 323         }
 324         if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
 325                 NSIM_EA(bpf->extack, "program bound to different dev");
 326                 return -EINVAL;
 327         }
 328
 329         state = bpf->prog->aux->offload->dev_priv;
 330         if (WARN_ON(strcmp(state->state, "xlated"))) {
 331                 NSIM_EA(bpf->extack, "offloading program in bad state");
 332                 return -EINVAL;
 333         }
 334         return 0;
 335 }
 336
 337 static bool
 338 nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
 339 {
 340         return e->key && !memcmp(key, e->key, map->key_size);
 341 }
 342
 343 static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
 344 {
 345         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 346         unsigned int i;
 347
 348         for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
 349                 if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
 350                         return i;
 351
 352         return -ENOENT;
 353 }
 354
 355 static int
 356 nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
 357 {
 358         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 359
 360         nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
 361         if (!nmap->entry[idx].key)
 362                 return -ENOMEM;
 363         nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
 364         if (!nmap->entry[idx].value) {
 365                 kfree(nmap->entry[idx].key);
 366                 nmap->entry[idx].key = NULL;
 367                 return -ENOMEM;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int
 374 nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
 375                       void *key, void *next_key)
 376 {
 377         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 378         int idx = -ENOENT;
 379
 380         mutex_lock(&nmap->mutex);
 381
 382         if (key)
 383                 idx = nsim_map_key_find(offmap, key);
 384         if (idx == -ENOENT)
 385                 idx = 0;
 386         else
 387                 idx++;
 388
 389         for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
 390                 if (nmap->entry[idx].key) {
 391                         memcpy(next_key, nmap->entry[idx].key,
 392                                offmap->map.key_size);
 393                         break;
 394                 }
 395         }
 396
 397         mutex_unlock(&nmap->mutex);
 398
 399         if (idx == ARRAY_SIZE(nmap->entry))
 400                 return -ENOENT;
 401         return 0;
 402 }
 403
 404 static int
 405 nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
 406 {
 407         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 408         int idx;
 409
 410         mutex_lock(&nmap->mutex);
 411
 412         idx = nsim_map_key_find(offmap, key);
 413         if (idx >= 0)
 414                 memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
 415
 416         mutex_unlock(&nmap->mutex);
 417
 418         return idx < 0 ? idx : 0;
 419 }
 420
 421 static int
 422 nsim_map_update_elem(struct bpf_offloaded_map *offmap,
 423                      void *key, void *value, u64 flags)
 424 {
 425         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 426         int idx, err = 0;
 427
 428         mutex_lock(&nmap->mutex);
 429
 430         idx = nsim_map_key_find(offmap, key);
 431         if (idx < 0 && flags == BPF_EXIST) {
 432                 err = idx;
 433                 goto exit_unlock;
 434         }
 435         if (idx >= 0 && flags == BPF_NOEXIST) {
 436                 err = -EEXIST;
 437                 goto exit_unlock;
 438         }
 439
 440         if (idx < 0) {
 441                 for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
 442                         if (!nmap->entry[idx].key)
 443                                 break;
 444                 if (idx == ARRAY_SIZE(nmap->entry)) {
 445                         err = -E2BIG;
 446                         goto exit_unlock;
 447                 }
 448
 449                 err = nsim_map_alloc_elem(offmap, idx);
 450                 if (err)
 451                         goto exit_unlock;
 452         }
 453
 454         memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
 455         memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
 456 exit_unlock:
 457         mutex_unlock(&nmap->mutex);
 458
 459         return err;
 460 }
 461
 462 static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
 463 {
 464         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 465         int idx;
 466
 467         if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
 468                 return -EINVAL;
 469
 470         mutex_lock(&nmap->mutex);
 471
 472         idx = nsim_map_key_find(offmap, key);
 473         if (idx >= 0) {
 474                 kfree(nmap->entry[idx].key);
 475                 kfree(nmap->entry[idx].value);
 476                 memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
 477         }
 478
 479         mutex_unlock(&nmap->mutex);
 480
 481         return idx < 0 ? idx : 0;
 482 }
 483
 484 static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
 485         .map_get_next_key       = nsim_map_get_next_key,
 486         .map_lookup_elem        = nsim_map_lookup_elem,
 487         .map_update_elem        = nsim_map_update_elem,
 488         .map_delete_elem        = nsim_map_delete_elem,
 489 };
 490
 491 static int
 492 nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
 493 {
 494         struct nsim_bpf_bound_map *nmap;
 495         int i, err;
 496
 497         if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
 498                     offmap->map.map_type != BPF_MAP_TYPE_HASH))
 499                 return -EINVAL;
 500         if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
 501                 return -ENOMEM;
 502         if (offmap->map.map_flags)
 503                 return -EINVAL;
 504
 505         nmap = kzalloc(sizeof(*nmap), GFP_USER);
 506         if (!nmap)
 507                 return -ENOMEM;
 508
 509         offmap->dev_priv = nmap;
 510         nmap->ns = ns;
 511         nmap->map = offmap;
 512         mutex_init(&nmap->mutex);
 513
 514         if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
 515                 for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 516                         u32 *key;
 517
 518                         err = nsim_map_alloc_elem(offmap, i);
 519                         if (err)
 520                                 goto err_free;
 521                         key = nmap->entry[i].key;
 522                         *key = i;
 523                 }
 524         }
 525
 526         offmap->dev_ops = &nsim_bpf_map_ops;
 527         list_add_tail(&nmap->l, &ns->sdev->bpf_bound_maps);
 528
 529         return 0;
 530
 531 err_free:
 532         while (--i >= 0) {
 533                 kfree(nmap->entry[i].key);
 534                 kfree(nmap->entry[i].value);
 535         }
 536         kfree(nmap);
 537         return err;
 538 }
 539
 540 static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
 541 {
 542         struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 543         unsigned int i;
 544
 545         for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 546                 kfree(nmap->entry[i].key);
 547                 kfree(nmap->entry[i].value);
 548         }
 549         list_del_init(&nmap->l);
 550         mutex_destroy(&nmap->mutex);
 551         kfree(nmap);
 552 }
 553
 554 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 555 {
 556         struct netdevsim *ns = netdev_priv(dev);
 557         int err;
 558
 559         ASSERT_RTNL();
 560
 561         switch (bpf->command) {
 562         case XDP_QUERY_PROG:
 563                 return xdp_attachment_query(&ns->xdp, bpf);
 564         case XDP_QUERY_PROG_HW:
 565                 return xdp_attachment_query(&ns->xdp_hw, bpf);
 566         case XDP_SETUP_PROG:
 567                 err = nsim_setup_prog_checks(ns, bpf);
 568                 if (err)
 569                         return err;
 570
 571                 return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
 572         case XDP_SETUP_PROG_HW:
 573                 err = nsim_setup_prog_hw_checks(ns, bpf);
 574                 if (err)
 575                         return err;
 576
 577                 return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
 578         case BPF_OFFLOAD_MAP_ALLOC:
 579                 if (!ns->bpf_map_accept)
 580                         return -EOPNOTSUPP;
 581
 582                 return nsim_bpf_map_alloc(ns, bpf->offmap);
 583         case BPF_OFFLOAD_MAP_FREE:
 584                 nsim_bpf_map_free(bpf->offmap);
 585                 return 0;
 586         default:
 587                 return -EINVAL;
 588         }
 589 }
 590
 591 int nsim_bpf_init(struct netdevsim *ns)
 592 {
 593         int err;
 594
 595         if (ns->sdev->refcnt == 1) {
 596                 INIT_LIST_HEAD(&ns->sdev->bpf_bound_progs);
 597                 INIT_LIST_HEAD(&ns->sdev->bpf_bound_maps);
 598
 599                 ns->sdev->ddir_bpf_bound_progs =
 600                         debugfs_create_dir("bpf_bound_progs", ns->sdev->ddir);
 601                 if (IS_ERR_OR_NULL(ns->sdev->ddir_bpf_bound_progs))
 602                         return -ENOMEM;
 603
 604                 ns->sdev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops);
 605                 err = PTR_ERR_OR_ZERO(ns->sdev->bpf_dev);
 606                 if (err)
 607                         return err;
 608         }
 609
 610         err = bpf_offload_dev_netdev_register(ns->sdev->bpf_dev, ns->netdev);
 611         if (err)
 612                 goto err_destroy_bdev;
 613
 614         debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
 615                            &ns->bpf_offloaded_id);
 616
 617         ns->bpf_bind_accept = true;
 618         debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
 619                             &ns->bpf_bind_accept);
 620         debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
 621                            &ns->bpf_bind_verifier_delay);
 622
 623         ns->bpf_tc_accept = true;
 624         debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
 625                             &ns->bpf_tc_accept);
 626         debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
 627                             &ns->bpf_tc_non_bound_accept);
 628         ns->bpf_xdpdrv_accept = true;
 629         debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
 630                             &ns->bpf_xdpdrv_accept);
 631         ns->bpf_xdpoffload_accept = true;
 632         debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
 633                             &ns->bpf_xdpoffload_accept);
 634
 635         ns->bpf_map_accept = true;
 636         debugfs_create_bool("bpf_map_accept", 0600, ns->ddir,
 637                             &ns->bpf_map_accept);
 638
 639         return 0;
 640
 641 err_destroy_bdev:
 642         if (ns->sdev->refcnt == 1)
 643                 bpf_offload_dev_destroy(ns->sdev->bpf_dev);
 644         return err;
 645 }
 646
 647 void nsim_bpf_uninit(struct netdevsim *ns)
 648 {
 649         WARN_ON(ns->xdp.prog);
 650         WARN_ON(ns->xdp_hw.prog);
 651         WARN_ON(ns->bpf_offloaded);
 652         bpf_offload_dev_netdev_unregister(ns->sdev->bpf_dev, ns->netdev);
 653
 654         if (ns->sdev->refcnt == 1) {
 655                 WARN_ON(!list_empty(&ns->sdev->bpf_bound_progs));
 656                 WARN_ON(!list_empty(&ns->sdev->bpf_bound_maps));
 657                 bpf_offload_dev_destroy(ns->sdev->bpf_dev);
 658         }
 659 }