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_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 }