linux/drivers/net/netdevsim/bpf.c
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   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
  29struct nsim_bpf_bound_prog {
  30        struct nsim_dev *nsim_dev;
  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
  40struct 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
  51static 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}
  60DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string);
  61
  62static int
  63nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn)
  64{
  65        struct nsim_bpf_bound_prog *state;
  66        int ret = 0;
  67
  68        state = env->prog->aux->offload->dev_priv;
  69        if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx)
  70                msleep(state->nsim_dev->bpf_bind_verifier_delay);
  71
  72        if (insn_idx == env->prog->len - 1) {
  73                pr_vlog(env, "Hello from netdevsim!\n");
  74
  75                if (!state->nsim_dev->bpf_bind_verifier_accept)
  76                        ret = -EOPNOTSUPP;
  77        }
  78
  79        return ret;
  80}
  81
  82static int nsim_bpf_finalize(struct bpf_verifier_env *env)
  83{
  84        return 0;
  85}
  86
  87static bool nsim_xdp_offload_active(struct netdevsim *ns)
  88{
  89        return ns->xdp_hw.prog;
  90}
  91
  92static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded)
  93{
  94        struct nsim_bpf_bound_prog *state;
  95
  96        if (!prog || !prog->aux->offload)
  97                return;
  98
  99        state = prog->aux->offload->dev_priv;
 100        state->is_loaded = loaded;
 101}
 102
 103static int
 104nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog)
 105{
 106        nsim_prog_set_loaded(ns->bpf_offloaded, false);
 107
 108        WARN(!!ns->bpf_offloaded != oldprog,
 109             "bad offload state, expected offload %sto be active",
 110             oldprog ? "" : "not ");
 111        ns->bpf_offloaded = prog;
 112        ns->bpf_offloaded_id = prog ? prog->aux->id : 0;
 113        nsim_prog_set_loaded(prog, true);
 114
 115        return 0;
 116}
 117
 118int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 119                               void *type_data, void *cb_priv)
 120{
 121        struct tc_cls_bpf_offload *cls_bpf = type_data;
 122        struct bpf_prog *prog = cls_bpf->prog;
 123        struct netdevsim *ns = cb_priv;
 124        struct bpf_prog *oldprog;
 125
 126        if (type != TC_SETUP_CLSBPF) {
 127                NSIM_EA(cls_bpf->common.extack,
 128                        "only offload of BPF classifiers supported");
 129                return -EOPNOTSUPP;
 130        }
 131
 132        if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 133                return -EOPNOTSUPP;
 134
 135        if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
 136                NSIM_EA(cls_bpf->common.extack,
 137                        "only ETH_P_ALL supported as filter protocol");
 138                return -EOPNOTSUPP;
 139        }
 140
 141        if (!ns->bpf_tc_accept) {
 142                NSIM_EA(cls_bpf->common.extack,
 143                        "netdevsim configured to reject BPF TC offload");
 144                return -EOPNOTSUPP;
 145        }
 146        /* Note: progs without skip_sw will probably not be dev bound */
 147        if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) {
 148                NSIM_EA(cls_bpf->common.extack,
 149                        "netdevsim configured to reject unbound programs");
 150                return -EOPNOTSUPP;
 151        }
 152
 153        if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
 154                return -EOPNOTSUPP;
 155
 156        oldprog = cls_bpf->oldprog;
 157
 158        /* Don't remove if oldprog doesn't match driver's state */
 159        if (ns->bpf_offloaded != oldprog) {
 160                oldprog = NULL;
 161                if (!cls_bpf->prog)
 162                        return 0;
 163                if (ns->bpf_offloaded) {
 164                        NSIM_EA(cls_bpf->common.extack,
 165                                "driver and netdev offload states mismatch");
 166                        return -EBUSY;
 167                }
 168        }
 169
 170        return nsim_bpf_offload(ns, cls_bpf->prog, oldprog);
 171}
 172
 173int nsim_bpf_disable_tc(struct netdevsim *ns)
 174{
 175        if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns))
 176                return -EBUSY;
 177        return 0;
 178}
 179
 180static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf)
 181{
 182        if (!nsim_xdp_offload_active(ns) && !bpf->prog)
 183                return 0;
 184        if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) {
 185                NSIM_EA(bpf->extack, "TC program is already loaded");
 186                return -EBUSY;
 187        }
 188
 189        return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns));
 190}
 191
 192static int
 193nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf,
 194                  struct xdp_attachment_info *xdp)
 195{
 196        int err;
 197
 198        if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) {
 199                NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS");
 200                return -EOPNOTSUPP;
 201        }
 202        if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) {
 203                NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS");
 204                return -EOPNOTSUPP;
 205        }
 206
 207        if (bpf->command == XDP_SETUP_PROG_HW) {
 208                err = nsim_xdp_offload_prog(ns, bpf);
 209                if (err)
 210                        return err;
 211        }
 212
 213        xdp_attachment_setup(xdp, bpf);
 214
 215        return 0;
 216}
 217
 218static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev,
 219                                struct bpf_prog *prog)
 220{
 221        struct nsim_bpf_bound_prog *state;
 222        char name[16];
 223        int ret;
 224
 225        state = kzalloc(sizeof(*state), GFP_KERNEL);
 226        if (!state)
 227                return -ENOMEM;
 228
 229        state->nsim_dev = nsim_dev;
 230        state->prog = prog;
 231        state->state = "verify";
 232
 233        /* Program id is not populated yet when we create the state. */
 234        sprintf(name, "%u", nsim_dev->prog_id_gen++);
 235        state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs);
 236        if (IS_ERR(state->ddir)) {
 237                ret = PTR_ERR(state->ddir);
 238                kfree(state);
 239                return ret;
 240        }
 241
 242        debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
 243        debugfs_create_file("state", 0400, state->ddir,
 244                            &state->state, &nsim_bpf_string_fops);
 245        debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded);
 246
 247        list_add_tail(&state->l, &nsim_dev->bpf_bound_progs);
 248
 249        prog->aux->offload->dev_priv = state;
 250
 251        return 0;
 252}
 253
 254static int nsim_bpf_verifier_prep(struct bpf_prog *prog)
 255{
 256        struct nsim_dev *nsim_dev =
 257                        bpf_offload_dev_priv(prog->aux->offload->offdev);
 258
 259        if (!nsim_dev->bpf_bind_accept)
 260                return -EOPNOTSUPP;
 261
 262        return nsim_bpf_create_prog(nsim_dev, prog);
 263}
 264
 265static int nsim_bpf_translate(struct bpf_prog *prog)
 266{
 267        struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv;
 268
 269        state->state = "xlated";
 270        return 0;
 271}
 272
 273static void nsim_bpf_destroy_prog(struct bpf_prog *prog)
 274{
 275        struct nsim_bpf_bound_prog *state;
 276
 277        state = prog->aux->offload->dev_priv;
 278        WARN(state->is_loaded,
 279             "offload state destroyed while program still bound");
 280        debugfs_remove_recursive(state->ddir);
 281        list_del(&state->l);
 282        kfree(state);
 283}
 284
 285static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = {
 286        .insn_hook      = nsim_bpf_verify_insn,
 287        .finalize       = nsim_bpf_finalize,
 288        .prepare        = nsim_bpf_verifier_prep,
 289        .translate      = nsim_bpf_translate,
 290        .destroy        = nsim_bpf_destroy_prog,
 291};
 292
 293static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 294{
 295        if (bpf->prog && bpf->prog->aux->offload) {
 296                NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
 297                return -EINVAL;
 298        }
 299        if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
 300                NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
 301                return -EINVAL;
 302        }
 303        return 0;
 304}
 305
 306static int
 307nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf)
 308{
 309        struct nsim_bpf_bound_prog *state;
 310
 311        if (!bpf->prog)
 312                return 0;
 313
 314        if (!bpf->prog->aux->offload) {
 315                NSIM_EA(bpf->extack, "xdpoffload of non-bound program");
 316                return -EINVAL;
 317        }
 318        if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) {
 319                NSIM_EA(bpf->extack, "program bound to different dev");
 320                return -EINVAL;
 321        }
 322
 323        state = bpf->prog->aux->offload->dev_priv;
 324        if (WARN_ON(strcmp(state->state, "xlated"))) {
 325                NSIM_EA(bpf->extack, "offloading program in bad state");
 326                return -EINVAL;
 327        }
 328        return 0;
 329}
 330
 331static bool
 332nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key)
 333{
 334        return e->key && !memcmp(key, e->key, map->key_size);
 335}
 336
 337static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key)
 338{
 339        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 340        unsigned int i;
 341
 342        for (i = 0; i < ARRAY_SIZE(nmap->entry); i++)
 343                if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key))
 344                        return i;
 345
 346        return -ENOENT;
 347}
 348
 349static int
 350nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx)
 351{
 352        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 353
 354        nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER);
 355        if (!nmap->entry[idx].key)
 356                return -ENOMEM;
 357        nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER);
 358        if (!nmap->entry[idx].value) {
 359                kfree(nmap->entry[idx].key);
 360                nmap->entry[idx].key = NULL;
 361                return -ENOMEM;
 362        }
 363
 364        return 0;
 365}
 366
 367static int
 368nsim_map_get_next_key(struct bpf_offloaded_map *offmap,
 369                      void *key, void *next_key)
 370{
 371        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 372        int idx = -ENOENT;
 373
 374        mutex_lock(&nmap->mutex);
 375
 376        if (key)
 377                idx = nsim_map_key_find(offmap, key);
 378        if (idx == -ENOENT)
 379                idx = 0;
 380        else
 381                idx++;
 382
 383        for (; idx < ARRAY_SIZE(nmap->entry); idx++) {
 384                if (nmap->entry[idx].key) {
 385                        memcpy(next_key, nmap->entry[idx].key,
 386                               offmap->map.key_size);
 387                        break;
 388                }
 389        }
 390
 391        mutex_unlock(&nmap->mutex);
 392
 393        if (idx == ARRAY_SIZE(nmap->entry))
 394                return -ENOENT;
 395        return 0;
 396}
 397
 398static int
 399nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value)
 400{
 401        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 402        int idx;
 403
 404        mutex_lock(&nmap->mutex);
 405
 406        idx = nsim_map_key_find(offmap, key);
 407        if (idx >= 0)
 408                memcpy(value, nmap->entry[idx].value, offmap->map.value_size);
 409
 410        mutex_unlock(&nmap->mutex);
 411
 412        return idx < 0 ? idx : 0;
 413}
 414
 415static int
 416nsim_map_update_elem(struct bpf_offloaded_map *offmap,
 417                     void *key, void *value, u64 flags)
 418{
 419        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 420        int idx, err = 0;
 421
 422        mutex_lock(&nmap->mutex);
 423
 424        idx = nsim_map_key_find(offmap, key);
 425        if (idx < 0 && flags == BPF_EXIST) {
 426                err = idx;
 427                goto exit_unlock;
 428        }
 429        if (idx >= 0 && flags == BPF_NOEXIST) {
 430                err = -EEXIST;
 431                goto exit_unlock;
 432        }
 433
 434        if (idx < 0) {
 435                for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++)
 436                        if (!nmap->entry[idx].key)
 437                                break;
 438                if (idx == ARRAY_SIZE(nmap->entry)) {
 439                        err = -E2BIG;
 440                        goto exit_unlock;
 441                }
 442
 443                err = nsim_map_alloc_elem(offmap, idx);
 444                if (err)
 445                        goto exit_unlock;
 446        }
 447
 448        memcpy(nmap->entry[idx].key, key, offmap->map.key_size);
 449        memcpy(nmap->entry[idx].value, value, offmap->map.value_size);
 450exit_unlock:
 451        mutex_unlock(&nmap->mutex);
 452
 453        return err;
 454}
 455
 456static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key)
 457{
 458        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 459        int idx;
 460
 461        if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY)
 462                return -EINVAL;
 463
 464        mutex_lock(&nmap->mutex);
 465
 466        idx = nsim_map_key_find(offmap, key);
 467        if (idx >= 0) {
 468                kfree(nmap->entry[idx].key);
 469                kfree(nmap->entry[idx].value);
 470                memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx]));
 471        }
 472
 473        mutex_unlock(&nmap->mutex);
 474
 475        return idx < 0 ? idx : 0;
 476}
 477
 478static const struct bpf_map_dev_ops nsim_bpf_map_ops = {
 479        .map_get_next_key       = nsim_map_get_next_key,
 480        .map_lookup_elem        = nsim_map_lookup_elem,
 481        .map_update_elem        = nsim_map_update_elem,
 482        .map_delete_elem        = nsim_map_delete_elem,
 483};
 484
 485static int
 486nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
 487{
 488        struct nsim_bpf_bound_map *nmap;
 489        int i, err;
 490
 491        if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY &&
 492                    offmap->map.map_type != BPF_MAP_TYPE_HASH))
 493                return -EINVAL;
 494        if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS)
 495                return -ENOMEM;
 496        if (offmap->map.map_flags)
 497                return -EINVAL;
 498
 499        nmap = kzalloc(sizeof(*nmap), GFP_USER);
 500        if (!nmap)
 501                return -ENOMEM;
 502
 503        offmap->dev_priv = nmap;
 504        nmap->ns = ns;
 505        nmap->map = offmap;
 506        mutex_init(&nmap->mutex);
 507
 508        if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) {
 509                for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 510                        u32 *key;
 511
 512                        err = nsim_map_alloc_elem(offmap, i);
 513                        if (err)
 514                                goto err_free;
 515                        key = nmap->entry[i].key;
 516                        *key = i;
 517                }
 518        }
 519
 520        offmap->dev_ops = &nsim_bpf_map_ops;
 521        list_add_tail(&nmap->l, &ns->nsim_dev->bpf_bound_maps);
 522
 523        return 0;
 524
 525err_free:
 526        while (--i >= 0) {
 527                kfree(nmap->entry[i].key);
 528                kfree(nmap->entry[i].value);
 529        }
 530        kfree(nmap);
 531        return err;
 532}
 533
 534static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap)
 535{
 536        struct nsim_bpf_bound_map *nmap = offmap->dev_priv;
 537        unsigned int i;
 538
 539        for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) {
 540                kfree(nmap->entry[i].key);
 541                kfree(nmap->entry[i].value);
 542        }
 543        list_del_init(&nmap->l);
 544        mutex_destroy(&nmap->mutex);
 545        kfree(nmap);
 546}
 547
 548int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
 549{
 550        struct netdevsim *ns = netdev_priv(dev);
 551        int err;
 552
 553        ASSERT_RTNL();
 554
 555        switch (bpf->command) {
 556        case XDP_SETUP_PROG:
 557                err = nsim_setup_prog_checks(ns, bpf);
 558                if (err)
 559                        return err;
 560
 561                return nsim_xdp_set_prog(ns, bpf, &ns->xdp);
 562        case XDP_SETUP_PROG_HW:
 563                err = nsim_setup_prog_hw_checks(ns, bpf);
 564                if (err)
 565                        return err;
 566
 567                return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw);
 568        case BPF_OFFLOAD_MAP_ALLOC:
 569                if (!ns->bpf_map_accept)
 570                        return -EOPNOTSUPP;
 571
 572                return nsim_bpf_map_alloc(ns, bpf->offmap);
 573        case BPF_OFFLOAD_MAP_FREE:
 574                nsim_bpf_map_free(bpf->offmap);
 575                return 0;
 576        default:
 577                return -EINVAL;
 578        }
 579}
 580
 581int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
 582{
 583        int err;
 584
 585        INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs);
 586        INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps);
 587
 588        nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs",
 589                                                            nsim_dev->ddir);
 590        if (IS_ERR(nsim_dev->ddir_bpf_bound_progs))
 591                return PTR_ERR(nsim_dev->ddir_bpf_bound_progs);
 592
 593        nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev);
 594        err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev);
 595        if (err)
 596                return err;
 597
 598        nsim_dev->bpf_bind_accept = true;
 599        debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir,
 600                            &nsim_dev->bpf_bind_accept);
 601        debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir,
 602                           &nsim_dev->bpf_bind_verifier_delay);
 603        nsim_dev->bpf_bind_verifier_accept = true;
 604        debugfs_create_bool("bpf_bind_verifier_accept", 0600, nsim_dev->ddir,
 605                            &nsim_dev->bpf_bind_verifier_accept);
 606        return 0;
 607}
 608
 609void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
 610{
 611        WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs));
 612        WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps));
 613        bpf_offload_dev_destroy(nsim_dev->bpf_dev);
 614}
 615
 616int nsim_bpf_init(struct netdevsim *ns)
 617{
 618        struct dentry *ddir = ns->nsim_dev_port->ddir;
 619        int err;
 620
 621        err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev,
 622                                              ns->netdev);
 623        if (err)
 624                return err;
 625
 626        debugfs_create_u32("bpf_offloaded_id", 0400, ddir,
 627                           &ns->bpf_offloaded_id);
 628
 629        ns->bpf_tc_accept = true;
 630        debugfs_create_bool("bpf_tc_accept", 0600, ddir,
 631                            &ns->bpf_tc_accept);
 632        debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ddir,
 633                            &ns->bpf_tc_non_bound_accept);
 634        ns->bpf_xdpdrv_accept = true;
 635        debugfs_create_bool("bpf_xdpdrv_accept", 0600, ddir,
 636                            &ns->bpf_xdpdrv_accept);
 637        ns->bpf_xdpoffload_accept = true;
 638        debugfs_create_bool("bpf_xdpoffload_accept", 0600, ddir,
 639                            &ns->bpf_xdpoffload_accept);
 640
 641        ns->bpf_map_accept = true;
 642        debugfs_create_bool("bpf_map_accept", 0600, ddir,
 643                            &ns->bpf_map_accept);
 644
 645        return 0;
 646}
 647
 648void nsim_bpf_uninit(struct netdevsim *ns)
 649{
 650        WARN_ON(ns->xdp.prog);
 651        WARN_ON(ns->xdp_hw.prog);
 652        WARN_ON(ns->bpf_offloaded);
 653        bpf_offload_dev_netdev_unregister(ns->nsim_dev->bpf_dev, ns->netdev);
 654}
 655