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 const struct bpf_prog_offload_ops nsim_bpf_analyzer_ops = {
  90         .insn_hook = nsim_bpf_verify_insn,
  91 };
  92
  93 static bool nsim_xdp_offload_active(struct netdevsim *ns)
  94 {
  95         return ns->xdp_prog_mode == XDP_ATTACHED_HW;
  96 }
  97
  98 static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
  99 {
 100         struct nsim_bpf_bound_prog *state;
 101
 102         if (!prog || !prog->aux->offload)
 103                 return;
 104
 105         state = prog->aux->offload->dev_priv;
 106         state->is_loaded = loaded;
 107 }
 108
 109 static int
 110 nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
 111 {
 112         nsim_prog_set_loaded(ns->bpf_offloaded, false);
 113
 114         WARN(!!ns->bpf_offloaded != oldprog,
 115              "bad offload state, expected offload %sto be active",
 116              oldprog ? "" : "not ");
 117         ns->bpf_offloaded = prog;
 118         ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
 119         nsim_prog_set_loaded(prog, true);
 120
 121         return 0;
 122 }
 123
 124 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 125                                void *type_data, void *cb_priv)
 126 {
 127         struct tc_cls_bpf_offload *cls_bpf = type_data;
 128         struct bpf_prog *prog = cls_bpf->prog;
 129         struct netdevsim *ns = cb_priv;
 130         struct bpf_prog *oldprog;
 131
 132         if (type != TC_SETUP_CLSBPF) {
 133                 NSIM_EA(cls_bpf->common.extack,
 134                         "only offload of BPF classifiers supported");
 135                 return -EOPNOTSUPP;
 136         }
 137
 138         if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 139                 return -EOPNOTSUPP;
 140
 141         if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
 142                 NSIM_EA(cls_bpf->common.extack,
 143                         "only ETH_P_ALL supported as filter protocol");
 144                 return -EOPNOTSUPP;
 145         }
 146
 147         if (!ns->bpf_tc_accept) {
 148                 NSIM_EA(cls_bpf->common.extack,
 149                         "netdevsim configured to reject BPF TC offload");
 150                 return -EOPNOTSUPP;
 151         }
 152         /* Note: progs without skip_sw will probably not be dev bound */
 153         if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
 154                 NSIM_EA(cls_bpf->common.extack,
 155                         "netdevsim configured to reject unbound programs");
 156                 return -EOPNOTSUPP;
 157         }
 158
 159         if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
 160                 return -EOPNOTSUPP;
 161
 162         oldprog = cls_bpf->oldprog;
 163
 164         /* Don't remove if oldprog doesn't match driver's state */
 165         if (ns->bpf_offloaded != oldprog) {
 166                 oldprog = NULL;
 167                 if (!cls_bpf->prog)
 168                         return 0;
 169                 if (ns->bpf_offloaded) {
 170                         NSIM_EA(cls_bpf->common.extack,
 171                                 "driver and netdev offload states mismatch");
 172                         return -EBUSY;
 173                 }
 174         }
 175
 176         return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
 177 }
 178
 179 int nsim_bpf_disable_tc(struct netdevsim *ns)
 180 {
 181         if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
 182                 return -EBUSY;
 183         return 0;
 184 }
 185
 186 static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 187 {
 188         if (!nsim_xdp_offload_active(ns) && !bpf->prog)
 189                 return 0;
 190         if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
 191                 NSIM_EA(bpf->extack, "TC program is already loaded");
 192                 return -EBUSY;
 193         }
 194
 195         return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
 196 }
 197
 198 static int nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 199 {
 200         int err;
 201
 202         if (ns->xdp_prog && (bpf->flags ^ ns->xdp_flags) & XDP_FLAGS_MODES) {
 203                 NSIM_EA(bpf->extack, "program loaded with different flags");
 204                 return -EBUSY;
 205         }
 206
 207         if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
 208                 NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
 209                 return -EOPNOTSUPP;
 210         }
 211         if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
 212                 NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
 213                 return -EOPNOTSUPP;
 214         }
 215
 216         if (bpf->command == XDP_SETUP_PROG_HW) {
 217                 err = nsim_xdp_offload_prog(ns, bpf);
 218                 if (err)
 219                         return err;
 220         }
 221
 222         if (ns->xdp_prog)
 223                 bpf_prog_put(ns->xdp_prog);
 224
 225         ns->xdp_prog = bpf->prog;
 226         ns->xdp_flags = bpf->flags;
 227
 228         if (!bpf->prog)
 229                 ns->xdp_prog_mode = XDP_ATTACHED_NONE;
 230         else if (bpf->command == XDP_SETUP_PROG)
 231                 ns->xdp_prog_mode = XDP_ATTACHED_DRV;
 232         else
 233                 ns->xdp_prog_mode = XDP_ATTACHED_HW;
 234
 235         return 0;
 236 }
 237
 238 static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 239 {
 240         struct nsim_bpf_bound_prog *state;
 241         char name[16];
 242
 243         state = kzalloc(sizeof(*state), GFP_KERNEL);
 244         if (!state)
 245                 return -ENOMEM;
 246
 247         state->ns = ns;
 248         state->prog = prog;
 249         state->state = "verify";
 250
 251         /* Program id is not populated yet when we create the state. */
 252         sprintf(name, "%u", ns->prog_id_gen++);
 253         state->ddir = debugfs_create_dir(name, ns->ddir_bpf_bound_progs);
 254         if (IS_ERR_OR_NULL(state->ddir)) {
 255                 kfree(state);
 256                 return -ENOMEM;
 257         }
 258
 259         debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
 260         debugfs_create_file("state", 0400, state->ddir,
 261                             &state->state, &nsim_bpf_string_fops);
 262         debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
 263
 264         list_add_tail(&state->l, &ns->bpf_bound_progs);
 265
 266         prog->aux->offload->dev_priv = state;
 267
 268         return 0;
 269 }
 270
 271 static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
 272 {
 273         struct nsim_bpf_bound_prog *state;
 274
 275         state = prog->aux->offload->dev_priv;
 276         WARN(state->is_loaded,
 277              "offload state destroyed while program still bound");
 278         debugfs_remove_recursive(state->ddir);
 279         list_del(&state->l);
 280         kfree(state);
 281 }
 282
 283 static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 284 {
 285         if (bpf->prog && bpf->prog->aux->offload) {
 286                 NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
 287                 return -EINVAL;
 288         }
 289         if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
 290                 NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
 291                 return -EINVAL;
 292         }
 293         if (nsim_xdp_offload_active(ns)) {
 294                 NSIM_EA(bpf->extack, "xdp offload active, can't load drv prog");
 295                 return -EBUSY;
 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->prog->aux->offload->netdev != 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->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         struct nsim_bpf_bound_prog *state;
 546         int err;
 547
 548         ASSERT_RTNL();
 549
 550         switch (bpf->command) {
 551         case BPF_OFFLOAD_VERIFIER_PREP:
 552                 if (!ns->bpf_bind_accept)
 553                         return -EOPNOTSUPP;
 554
 555                 err = nsim_bpf_create_prog(ns, bpf->verifier.prog);
 556                 if (err)
 557                         return err;
 558
 559                 bpf->verifier.ops = &nsim_bpf_analyzer_ops;
 560                 return 0;
 561         case BPF_OFFLOAD_TRANSLATE:
 562                 state = bpf->offload.prog->aux->offload->dev_priv;
 563
 564                 state->state = "xlated";
 565                 return 0;
 566         case BPF_OFFLOAD_DESTROY:
 567                 nsim_bpf_destroy_prog(bpf->offload.prog);
 568                 return 0;
 569         case XDP_QUERY_PROG:
 570                 bpf->prog_attached = ns->xdp_prog_mode;
 571                 bpf->prog_id = ns->xdp_prog ? ns->xdp_prog->aux->id : 0;
 572                 bpf->prog_flags = ns->xdp_prog ? ns->xdp_flags : 0;
 573                 return 0;
 574         case XDP_SETUP_PROG:
 575                 err = nsim_setup_prog_checks(ns, bpf);
 576                 if (err)
 577                         return err;
 578
 579                 return nsim_xdp_set_prog(ns, bpf);
 580         case XDP_SETUP_PROG_HW:
 581                 err = nsim_setup_prog_hw_checks(ns, bpf);
 582                 if (err)
 583                         return err;
 584
 585                 return nsim_xdp_set_prog(ns, bpf);
 586         case BPF_OFFLOAD_MAP_ALLOC:
 587                 if (!ns->bpf_map_accept)
 588                         return -EOPNOTSUPP;
 589
 590                 return nsim_bpf_map_alloc(ns, bpf->offmap);
 591         case BPF_OFFLOAD_MAP_FREE:
 592                 nsim_bpf_map_free(bpf->offmap);
 593                 return 0;
 594         default:
 595                 return -EINVAL;
 596         }
 597 }
 598
 599 int nsim_bpf_init(struct netdevsim *ns)
 600 {
 601         INIT_LIST_HEAD(&ns->bpf_bound_progs);
 602         INIT_LIST_HEAD(&ns->bpf_bound_maps);
 603
 604         debugfs_create_u32("bpf_offloaded_id", 0400, ns->ddir,
 605                            &ns->bpf_offloaded_id);
 606
 607         ns->bpf_bind_accept = true;
 608         debugfs_create_bool("bpf_bind_accept", 0600, ns->ddir,
 609                             &ns->bpf_bind_accept);
 610         debugfs_create_u32("bpf_bind_verifier_delay", 0600, ns->ddir,
 611                            &ns->bpf_bind_verifier_delay);
 612         ns->ddir_bpf_bound_progs =
 613                 debugfs_create_dir("bpf_bound_progs", ns->ddir);
 614         if (IS_ERR_OR_NULL(ns->ddir_bpf_bound_progs))
 615                 return -ENOMEM;
 616
 617         ns->bpf_tc_accept = true;
 618         debugfs_create_bool("bpf_tc_accept", 0600, ns->ddir,
 619                             &ns->bpf_tc_accept);
 620         debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ns->ddir,
 621                             &ns->bpf_tc_non_bound_accept);
 622         ns->bpf_xdpdrv_accept = true;
 623         debugfs_create_bool("bpf_xdpdrv_accept", 0600, ns->ddir,
 624                             &ns->bpf_xdpdrv_accept);
 625         ns->bpf_xdpoffload_accept = true;
 626         debugfs_create_bool("bpf_xdpoffload_accept", 0600, ns->ddir,
 627                             &ns->bpf_xdpoffload_accept);
 628
 629         ns->bpf_map_accept = true;
 630         debugfs_create_bool("bpf_map_accept", 0600, ns->ddir,
 631                             &ns->bpf_map_accept);
 632
 633         return 0;
 634 }
 635
 636 void nsim_bpf_uninit(struct netdevsim *ns)
 637 {
 638         WARN_ON(!list_empty(&ns->bpf_bound_progs));
 639         WARN_ON(!list_empty(&ns->bpf_bound_maps));
 640         WARN_ON(ns->xdp_prog);
 641         WARN_ON(ns->bpf_offloaded);
 642 }