1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 - channel management 4 * Copyright 2020 - 2022 Intel Corporation 5 */ 6 7 #include <linux/nl80211.h> 8 #include <linux/export.h> 9 #include <linux/rtnetlink.h> 10 #include <net/cfg80211.h> 11 #include "ieee80211_i.h" 12 #include "driver-ops.h" 13 #include "rate.h" 14 15 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local, 16 struct ieee80211_chanctx *ctx) 17 { 18 struct ieee80211_link_data *link; 19 int num = 0; 20 21 lockdep_assert_wiphy(local->hw.wiphy); 22 23 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) 24 num++; 25 26 return num; 27 } 28 29 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local, 30 struct ieee80211_chanctx *ctx) 31 { 32 struct ieee80211_link_data *link; 33 int num = 0; 34 35 lockdep_assert_wiphy(local->hw.wiphy); 36 37 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) 38 num++; 39 40 return num; 41 } 42 43 int ieee80211_chanctx_refcount(struct ieee80211_local *local, 44 struct ieee80211_chanctx *ctx) 45 { 46 return ieee80211_chanctx_num_assigned(local, ctx) + 47 ieee80211_chanctx_num_reserved(local, ctx); 48 } 49 50 static int ieee80211_num_chanctx(struct ieee80211_local *local) 51 { 52 struct ieee80211_chanctx *ctx; 53 int num = 0; 54 55 lockdep_assert_wiphy(local->hw.wiphy); 56 57 list_for_each_entry(ctx, &local->chanctx_list, list) 58 num++; 59 60 return num; 61 } 62 63 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) 64 { 65 lockdep_assert_wiphy(local->hw.wiphy); 66 67 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); 68 } 69 70 static struct ieee80211_chanctx * 71 ieee80211_link_get_chanctx(struct ieee80211_link_data *link) 72 { 73 struct ieee80211_local *local __maybe_unused = link->sdata->local; 74 struct ieee80211_chanctx_conf *conf; 75 76 conf = rcu_dereference_protected(link->conf->chanctx_conf, 77 lockdep_is_held(&local->hw.wiphy->mtx)); 78 if (!conf) 79 return NULL; 80 81 return container_of(conf, struct ieee80211_chanctx, conf); 82 } 83 84 static const struct cfg80211_chan_def * 85 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local, 86 struct ieee80211_chanctx *ctx, 87 const struct cfg80211_chan_def *compat) 88 { 89 struct ieee80211_link_data *link; 90 91 lockdep_assert_wiphy(local->hw.wiphy); 92 93 list_for_each_entry(link, &ctx->reserved_links, 94 reserved_chanctx_list) { 95 if (!compat) 96 compat = &link->reserved_chandef; 97 98 compat = cfg80211_chandef_compatible(&link->reserved_chandef, 99 compat); 100 if (!compat) 101 break; 102 } 103 104 return compat; 105 } 106 107 static const struct cfg80211_chan_def * 108 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local, 109 struct ieee80211_chanctx *ctx, 110 const struct cfg80211_chan_def *compat) 111 { 112 struct ieee80211_link_data *link; 113 114 lockdep_assert_wiphy(local->hw.wiphy); 115 116 list_for_each_entry(link, &ctx->assigned_links, 117 assigned_chanctx_list) { 118 struct ieee80211_bss_conf *link_conf = link->conf; 119 120 if (link->reserved_chanctx) 121 continue; 122 123 if (!compat) 124 compat = &link_conf->chandef; 125 126 compat = cfg80211_chandef_compatible( 127 &link_conf->chandef, compat); 128 if (!compat) 129 break; 130 } 131 132 return compat; 133 } 134 135 static const struct cfg80211_chan_def * 136 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local, 137 struct ieee80211_chanctx *ctx, 138 const struct cfg80211_chan_def *compat) 139 { 140 lockdep_assert_wiphy(local->hw.wiphy); 141 142 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat); 143 if (!compat) 144 return NULL; 145 146 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat); 147 if (!compat) 148 return NULL; 149 150 return compat; 151 } 152 153 static bool 154 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local, 155 struct ieee80211_chanctx *ctx, 156 const struct cfg80211_chan_def *def) 157 { 158 lockdep_assert_wiphy(local->hw.wiphy); 159 160 if (ieee80211_chanctx_combined_chandef(local, ctx, def)) 161 return true; 162 163 if (!list_empty(&ctx->reserved_links) && 164 ieee80211_chanctx_reserved_chandef(local, ctx, def)) 165 return true; 166 167 return false; 168 } 169 170 static struct ieee80211_chanctx * 171 ieee80211_find_reservation_chanctx(struct ieee80211_local *local, 172 const struct cfg80211_chan_def *chandef, 173 enum ieee80211_chanctx_mode mode) 174 { 175 struct ieee80211_chanctx *ctx; 176 177 lockdep_assert_wiphy(local->hw.wiphy); 178 179 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 180 return NULL; 181 182 list_for_each_entry(ctx, &local->chanctx_list, list) { 183 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 184 continue; 185 186 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 187 continue; 188 189 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx, 190 chandef)) 191 continue; 192 193 return ctx; 194 } 195 196 return NULL; 197 } 198 199 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta, 200 unsigned int link_id) 201 { 202 enum ieee80211_sta_rx_bandwidth width; 203 struct link_sta_info *link_sta; 204 205 link_sta = rcu_dereference(sta->link[link_id]); 206 207 /* no effect if this STA has no presence on this link */ 208 if (!link_sta) 209 return NL80211_CHAN_WIDTH_20_NOHT; 210 211 width = ieee80211_sta_cap_rx_bw(link_sta); 212 213 switch (width) { 214 case IEEE80211_STA_RX_BW_20: 215 if (link_sta->pub->ht_cap.ht_supported) 216 return NL80211_CHAN_WIDTH_20; 217 else 218 return NL80211_CHAN_WIDTH_20_NOHT; 219 case IEEE80211_STA_RX_BW_40: 220 return NL80211_CHAN_WIDTH_40; 221 case IEEE80211_STA_RX_BW_80: 222 return NL80211_CHAN_WIDTH_80; 223 case IEEE80211_STA_RX_BW_160: 224 /* 225 * This applied for both 160 and 80+80. since we use 226 * the returned value to consider degradation of 227 * ctx->conf.min_def, we have to make sure to take 228 * the bigger one (NL80211_CHAN_WIDTH_160). 229 * Otherwise we might try degrading even when not 230 * needed, as the max required sta_bw returned (80+80) 231 * might be smaller than the configured bw (160). 232 */ 233 return NL80211_CHAN_WIDTH_160; 234 case IEEE80211_STA_RX_BW_320: 235 return NL80211_CHAN_WIDTH_320; 236 default: 237 WARN_ON(1); 238 return NL80211_CHAN_WIDTH_20; 239 } 240 } 241 242 static enum nl80211_chan_width 243 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata, 244 unsigned int link_id) 245 { 246 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 247 struct sta_info *sta; 248 249 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 250 if (sdata != sta->sdata && 251 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 252 continue; 253 254 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id)); 255 } 256 257 return max_bw; 258 } 259 260 static enum nl80211_chan_width 261 ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data *sdata, 262 struct ieee80211_chanctx *ctx, 263 struct ieee80211_link_data *rsvd_for) 264 { 265 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 266 struct ieee80211_vif *vif = &sdata->vif; 267 int link_id; 268 269 rcu_read_lock(); 270 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { 271 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 272 struct ieee80211_link_data *link = 273 rcu_dereference(sdata->link[link_id]); 274 275 if (!link) 276 continue; 277 278 if (link != rsvd_for && 279 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf) 280 continue; 281 282 switch (vif->type) { 283 case NL80211_IFTYPE_AP: 284 case NL80211_IFTYPE_AP_VLAN: 285 width = ieee80211_get_max_required_bw(sdata, link_id); 286 break; 287 case NL80211_IFTYPE_STATION: 288 /* 289 * The ap's sta->bandwidth is not set yet at this 290 * point, so take the width from the chandef, but 291 * account also for TDLS peers 292 */ 293 width = max(link->conf->chandef.width, 294 ieee80211_get_max_required_bw(sdata, link_id)); 295 break; 296 case NL80211_IFTYPE_P2P_DEVICE: 297 case NL80211_IFTYPE_NAN: 298 continue; 299 case NL80211_IFTYPE_ADHOC: 300 case NL80211_IFTYPE_MESH_POINT: 301 case NL80211_IFTYPE_OCB: 302 width = link->conf->chandef.width; 303 break; 304 case NL80211_IFTYPE_WDS: 305 case NL80211_IFTYPE_UNSPECIFIED: 306 case NUM_NL80211_IFTYPES: 307 case NL80211_IFTYPE_MONITOR: 308 case NL80211_IFTYPE_P2P_CLIENT: 309 case NL80211_IFTYPE_P2P_GO: 310 WARN_ON_ONCE(1); 311 } 312 313 max_bw = max(max_bw, width); 314 } 315 rcu_read_unlock(); 316 317 return max_bw; 318 } 319 320 static enum nl80211_chan_width 321 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 322 struct ieee80211_chanctx *ctx, 323 struct ieee80211_link_data *rsvd_for) 324 { 325 struct ieee80211_sub_if_data *sdata; 326 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 327 328 rcu_read_lock(); 329 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 330 enum nl80211_chan_width width; 331 332 if (!ieee80211_sdata_running(sdata)) 333 continue; 334 335 width = ieee80211_get_chanctx_vif_max_required_bw(sdata, ctx, 336 rsvd_for); 337 338 max_bw = max(max_bw, width); 339 } 340 341 /* use the configured bandwidth in case of monitor interface */ 342 sdata = rcu_dereference(local->monitor_sdata); 343 if (sdata && 344 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf) 345 max_bw = max(max_bw, ctx->conf.def.width); 346 347 rcu_read_unlock(); 348 349 return max_bw; 350 } 351 352 /* 353 * recalc the min required chan width of the channel context, which is 354 * the max of min required widths of all the interfaces bound to this 355 * channel context. 356 */ 357 static u32 358 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 359 struct ieee80211_chanctx *ctx, 360 struct ieee80211_link_data *rsvd_for) 361 { 362 enum nl80211_chan_width max_bw; 363 struct cfg80211_chan_def min_def; 364 365 lockdep_assert_wiphy(local->hw.wiphy); 366 367 /* don't optimize non-20MHz based and radar_enabled confs */ 368 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 369 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 370 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 || 371 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 || 372 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 || 373 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 || 374 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 || 375 ctx->conf.radar_enabled) { 376 ctx->conf.min_def = ctx->conf.def; 377 return 0; 378 } 379 380 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for); 381 382 /* downgrade chandef up to max_bw */ 383 min_def = ctx->conf.def; 384 while (min_def.width > max_bw) 385 ieee80211_chandef_downgrade(&min_def); 386 387 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 388 return 0; 389 390 ctx->conf.min_def = min_def; 391 if (!ctx->driver_present) 392 return 0; 393 394 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH; 395 } 396 397 /* calling this function is assuming that station vif is updated to 398 * lates changes by calling ieee80211_link_update_chandef 399 */ 400 static void ieee80211_chan_bw_change(struct ieee80211_local *local, 401 struct ieee80211_chanctx *ctx, 402 bool narrowed) 403 { 404 struct sta_info *sta; 405 struct ieee80211_supported_band *sband = 406 local->hw.wiphy->bands[ctx->conf.def.chan->band]; 407 408 rcu_read_lock(); 409 list_for_each_entry_rcu(sta, &local->sta_list, 410 list) { 411 struct ieee80211_sub_if_data *sdata = sta->sdata; 412 enum ieee80211_sta_rx_bandwidth new_sta_bw; 413 unsigned int link_id; 414 415 if (!ieee80211_sdata_running(sta->sdata)) 416 continue; 417 418 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) { 419 struct ieee80211_bss_conf *link_conf = 420 rcu_dereference(sdata->vif.link_conf[link_id]); 421 struct link_sta_info *link_sta; 422 423 if (!link_conf) 424 continue; 425 426 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf) 427 continue; 428 429 link_sta = rcu_dereference(sta->link[link_id]); 430 if (!link_sta) 431 continue; 432 433 new_sta_bw = ieee80211_sta_cur_vht_bw(link_sta); 434 435 /* nothing change */ 436 if (new_sta_bw == link_sta->pub->bandwidth) 437 continue; 438 439 /* vif changed to narrow BW and narrow BW for station wasn't 440 * requested or vise versa */ 441 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed) 442 continue; 443 444 link_sta->pub->bandwidth = new_sta_bw; 445 rate_control_rate_update(local, sband, sta, link_id, 446 IEEE80211_RC_BW_CHANGED); 447 } 448 } 449 rcu_read_unlock(); 450 } 451 452 /* 453 * recalc the min required chan width of the channel context, which is 454 * the max of min required widths of all the interfaces bound to this 455 * channel context. 456 */ 457 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 458 struct ieee80211_chanctx *ctx, 459 struct ieee80211_link_data *rsvd_for) 460 { 461 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for); 462 463 if (!changed) 464 return; 465 466 /* check is BW narrowed */ 467 ieee80211_chan_bw_change(local, ctx, true); 468 469 drv_change_chanctx(local, ctx, changed); 470 471 /* check is BW wider */ 472 ieee80211_chan_bw_change(local, ctx, false); 473 } 474 475 static void _ieee80211_change_chanctx(struct ieee80211_local *local, 476 struct ieee80211_chanctx *ctx, 477 struct ieee80211_chanctx *old_ctx, 478 const struct cfg80211_chan_def *chandef, 479 struct ieee80211_link_data *rsvd_for) 480 { 481 u32 changed; 482 483 /* expected to handle only 20/40/80/160/320 channel widths */ 484 switch (chandef->width) { 485 case NL80211_CHAN_WIDTH_20_NOHT: 486 case NL80211_CHAN_WIDTH_20: 487 case NL80211_CHAN_WIDTH_40: 488 case NL80211_CHAN_WIDTH_80: 489 case NL80211_CHAN_WIDTH_80P80: 490 case NL80211_CHAN_WIDTH_160: 491 case NL80211_CHAN_WIDTH_320: 492 break; 493 default: 494 WARN_ON(1); 495 } 496 497 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def 498 * due to maybe not returning from it, e.g in case new context was added 499 * first time with all parameters up to date. 500 */ 501 ieee80211_chan_bw_change(local, old_ctx, true); 502 503 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 504 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for); 505 return; 506 } 507 508 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 509 510 ctx->conf.def = *chandef; 511 512 /* check if min chanctx also changed */ 513 changed = IEEE80211_CHANCTX_CHANGE_WIDTH | 514 _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for); 515 drv_change_chanctx(local, ctx, changed); 516 517 if (!local->use_chanctx) { 518 local->_oper_chandef = *chandef; 519 ieee80211_hw_config(local, 0); 520 } 521 522 /* check is BW wider */ 523 ieee80211_chan_bw_change(local, old_ctx, false); 524 } 525 526 static void ieee80211_change_chanctx(struct ieee80211_local *local, 527 struct ieee80211_chanctx *ctx, 528 struct ieee80211_chanctx *old_ctx, 529 const struct cfg80211_chan_def *chandef) 530 { 531 _ieee80211_change_chanctx(local, ctx, old_ctx, chandef, NULL); 532 } 533 534 static struct ieee80211_chanctx * 535 ieee80211_find_chanctx(struct ieee80211_local *local, 536 const struct cfg80211_chan_def *chandef, 537 enum ieee80211_chanctx_mode mode) 538 { 539 struct ieee80211_chanctx *ctx; 540 541 lockdep_assert_wiphy(local->hw.wiphy); 542 543 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 544 return NULL; 545 546 list_for_each_entry(ctx, &local->chanctx_list, list) { 547 const struct cfg80211_chan_def *compat; 548 549 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 550 continue; 551 552 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 553 continue; 554 555 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 556 if (!compat) 557 continue; 558 559 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 560 compat); 561 if (!compat) 562 continue; 563 564 ieee80211_change_chanctx(local, ctx, ctx, compat); 565 566 return ctx; 567 } 568 569 return NULL; 570 } 571 572 bool ieee80211_is_radar_required(struct ieee80211_local *local) 573 { 574 struct ieee80211_sub_if_data *sdata; 575 576 lockdep_assert_wiphy(local->hw.wiphy); 577 578 rcu_read_lock(); 579 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 580 unsigned int link_id; 581 582 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { 583 struct ieee80211_link_data *link; 584 585 link = rcu_dereference(sdata->link[link_id]); 586 587 if (link && link->radar_required) { 588 rcu_read_unlock(); 589 return true; 590 } 591 } 592 } 593 rcu_read_unlock(); 594 595 return false; 596 } 597 598 static bool 599 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 600 struct ieee80211_chanctx *ctx) 601 { 602 struct ieee80211_chanctx_conf *conf = &ctx->conf; 603 struct ieee80211_sub_if_data *sdata; 604 bool required = false; 605 606 lockdep_assert_wiphy(local->hw.wiphy); 607 608 rcu_read_lock(); 609 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 610 unsigned int link_id; 611 612 if (!ieee80211_sdata_running(sdata)) 613 continue; 614 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { 615 struct ieee80211_link_data *link; 616 617 link = rcu_dereference(sdata->link[link_id]); 618 if (!link) 619 continue; 620 621 if (rcu_access_pointer(link->conf->chanctx_conf) != conf) 622 continue; 623 if (!link->radar_required) 624 continue; 625 required = true; 626 break; 627 } 628 629 if (required) 630 break; 631 } 632 rcu_read_unlock(); 633 634 return required; 635 } 636 637 static struct ieee80211_chanctx * 638 ieee80211_alloc_chanctx(struct ieee80211_local *local, 639 const struct cfg80211_chan_def *chandef, 640 enum ieee80211_chanctx_mode mode) 641 { 642 struct ieee80211_chanctx *ctx; 643 644 lockdep_assert_wiphy(local->hw.wiphy); 645 646 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 647 if (!ctx) 648 return NULL; 649 650 INIT_LIST_HEAD(&ctx->assigned_links); 651 INIT_LIST_HEAD(&ctx->reserved_links); 652 ctx->conf.def = *chandef; 653 ctx->conf.rx_chains_static = 1; 654 ctx->conf.rx_chains_dynamic = 1; 655 ctx->mode = mode; 656 ctx->conf.radar_enabled = false; 657 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL); 658 659 return ctx; 660 } 661 662 static int ieee80211_add_chanctx(struct ieee80211_local *local, 663 struct ieee80211_chanctx *ctx) 664 { 665 u32 changed; 666 int err; 667 668 lockdep_assert_wiphy(local->hw.wiphy); 669 670 if (!local->use_chanctx) 671 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 672 673 /* turn idle off *before* setting channel -- some drivers need that */ 674 changed = ieee80211_idle_off(local); 675 if (changed) 676 ieee80211_hw_config(local, changed); 677 678 if (!local->use_chanctx) { 679 local->_oper_chandef = ctx->conf.def; 680 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 681 } else { 682 err = drv_add_chanctx(local, ctx); 683 if (err) { 684 ieee80211_recalc_idle(local); 685 return err; 686 } 687 } 688 689 return 0; 690 } 691 692 static struct ieee80211_chanctx * 693 ieee80211_new_chanctx(struct ieee80211_local *local, 694 const struct cfg80211_chan_def *chandef, 695 enum ieee80211_chanctx_mode mode) 696 { 697 struct ieee80211_chanctx *ctx; 698 int err; 699 700 lockdep_assert_wiphy(local->hw.wiphy); 701 702 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 703 if (!ctx) 704 return ERR_PTR(-ENOMEM); 705 706 err = ieee80211_add_chanctx(local, ctx); 707 if (err) { 708 kfree(ctx); 709 return ERR_PTR(err); 710 } 711 712 list_add_rcu(&ctx->list, &local->chanctx_list); 713 return ctx; 714 } 715 716 static void ieee80211_del_chanctx(struct ieee80211_local *local, 717 struct ieee80211_chanctx *ctx) 718 { 719 lockdep_assert_wiphy(local->hw.wiphy); 720 721 if (!local->use_chanctx) { 722 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 723 /* S1G doesn't have 20MHz, so get the correct width for the 724 * current channel. 725 */ 726 if (chandef->chan->band == NL80211_BAND_S1GHZ) 727 chandef->width = 728 ieee80211_s1g_channel_width(chandef->chan); 729 else 730 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 731 chandef->center_freq1 = chandef->chan->center_freq; 732 chandef->freq1_offset = chandef->chan->freq_offset; 733 chandef->center_freq2 = 0; 734 735 /* NOTE: Disabling radar is only valid here for 736 * single channel context. To be sure, check it ... 737 */ 738 WARN_ON(local->hw.conf.radar_enabled && 739 !list_empty(&local->chanctx_list)); 740 741 local->hw.conf.radar_enabled = false; 742 743 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 744 } else { 745 drv_remove_chanctx(local, ctx); 746 } 747 748 ieee80211_recalc_idle(local); 749 } 750 751 static void ieee80211_free_chanctx(struct ieee80211_local *local, 752 struct ieee80211_chanctx *ctx) 753 { 754 lockdep_assert_wiphy(local->hw.wiphy); 755 756 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 757 758 list_del_rcu(&ctx->list); 759 ieee80211_del_chanctx(local, ctx); 760 kfree_rcu(ctx, rcu_head); 761 } 762 763 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 764 struct ieee80211_chanctx *ctx) 765 { 766 struct ieee80211_chanctx_conf *conf = &ctx->conf; 767 struct ieee80211_sub_if_data *sdata; 768 const struct cfg80211_chan_def *compat = NULL; 769 struct sta_info *sta; 770 771 lockdep_assert_wiphy(local->hw.wiphy); 772 773 rcu_read_lock(); 774 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 775 int link_id; 776 777 if (!ieee80211_sdata_running(sdata)) 778 continue; 779 780 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 781 continue; 782 783 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { 784 struct ieee80211_bss_conf *link_conf = 785 rcu_dereference(sdata->vif.link_conf[link_id]); 786 787 if (!link_conf) 788 continue; 789 790 if (rcu_access_pointer(link_conf->chanctx_conf) != conf) 791 continue; 792 793 if (!compat) 794 compat = &link_conf->chandef; 795 796 compat = cfg80211_chandef_compatible(&link_conf->chandef, 797 compat); 798 if (WARN_ON_ONCE(!compat)) 799 break; 800 } 801 } 802 803 if (WARN_ON_ONCE(!compat)) { 804 rcu_read_unlock(); 805 return; 806 } 807 808 /* TDLS peers can sometimes affect the chandef width */ 809 list_for_each_entry_rcu(sta, &local->sta_list, list) { 810 if (!sta->uploaded || 811 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 812 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 813 !sta->tdls_chandef.chan) 814 continue; 815 816 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 817 compat); 818 if (WARN_ON_ONCE(!compat)) 819 break; 820 } 821 rcu_read_unlock(); 822 823 if (!compat) 824 return; 825 826 ieee80211_change_chanctx(local, ctx, ctx, compat); 827 } 828 829 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 830 struct ieee80211_chanctx *chanctx) 831 { 832 bool radar_enabled; 833 834 lockdep_assert_wiphy(local->hw.wiphy); 835 836 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 837 838 if (radar_enabled == chanctx->conf.radar_enabled) 839 return; 840 841 chanctx->conf.radar_enabled = radar_enabled; 842 843 if (!local->use_chanctx) { 844 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 845 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 846 } 847 848 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 849 } 850 851 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link, 852 struct ieee80211_chanctx *new_ctx) 853 { 854 struct ieee80211_sub_if_data *sdata = link->sdata; 855 struct ieee80211_local *local = sdata->local; 856 struct ieee80211_chanctx_conf *conf; 857 struct ieee80211_chanctx *curr_ctx = NULL; 858 int ret = 0; 859 860 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 861 return -ENOTSUPP; 862 863 conf = rcu_dereference_protected(link->conf->chanctx_conf, 864 lockdep_is_held(&local->hw.wiphy->mtx)); 865 866 if (conf) { 867 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 868 869 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx); 870 conf = NULL; 871 list_del(&link->assigned_chanctx_list); 872 } 873 874 if (new_ctx) { 875 /* recalc considering the link we'll use it for now */ 876 ieee80211_recalc_chanctx_min_def(local, new_ctx, link); 877 878 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx); 879 if (ret) 880 goto out; 881 882 conf = &new_ctx->conf; 883 list_add(&link->assigned_chanctx_list, 884 &new_ctx->assigned_links); 885 } 886 887 out: 888 rcu_assign_pointer(link->conf->chanctx_conf, conf); 889 890 sdata->vif.cfg.idle = !conf; 891 892 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 893 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 894 ieee80211_recalc_smps_chanctx(local, curr_ctx); 895 ieee80211_recalc_radar_chanctx(local, curr_ctx); 896 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL); 897 } 898 899 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 900 ieee80211_recalc_txpower(sdata, false); 901 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL); 902 } 903 904 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 905 sdata->vif.type != NL80211_IFTYPE_MONITOR) 906 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE); 907 908 ieee80211_check_fast_xmit_iface(sdata); 909 910 return ret; 911 } 912 913 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 914 struct ieee80211_chanctx *chanctx) 915 { 916 struct ieee80211_sub_if_data *sdata; 917 u8 rx_chains_static, rx_chains_dynamic; 918 919 lockdep_assert_wiphy(local->hw.wiphy); 920 921 rx_chains_static = 1; 922 rx_chains_dynamic = 1; 923 924 rcu_read_lock(); 925 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 926 u8 needed_static, needed_dynamic; 927 unsigned int link_id; 928 929 if (!ieee80211_sdata_running(sdata)) 930 continue; 931 932 switch (sdata->vif.type) { 933 case NL80211_IFTYPE_STATION: 934 if (!sdata->u.mgd.associated) 935 continue; 936 break; 937 case NL80211_IFTYPE_AP: 938 case NL80211_IFTYPE_ADHOC: 939 case NL80211_IFTYPE_MESH_POINT: 940 case NL80211_IFTYPE_OCB: 941 break; 942 default: 943 continue; 944 } 945 946 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { 947 struct ieee80211_link_data *link; 948 949 link = rcu_dereference(sdata->link[link_id]); 950 951 if (!link) 952 continue; 953 954 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf) 955 continue; 956 957 switch (link->smps_mode) { 958 default: 959 WARN_ONCE(1, "Invalid SMPS mode %d\n", 960 link->smps_mode); 961 fallthrough; 962 case IEEE80211_SMPS_OFF: 963 needed_static = link->needed_rx_chains; 964 needed_dynamic = link->needed_rx_chains; 965 break; 966 case IEEE80211_SMPS_DYNAMIC: 967 needed_static = 1; 968 needed_dynamic = link->needed_rx_chains; 969 break; 970 case IEEE80211_SMPS_STATIC: 971 needed_static = 1; 972 needed_dynamic = 1; 973 break; 974 } 975 976 rx_chains_static = max(rx_chains_static, needed_static); 977 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 978 } 979 } 980 981 /* Disable SMPS for the monitor interface */ 982 sdata = rcu_dereference(local->monitor_sdata); 983 if (sdata && 984 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf) 985 rx_chains_dynamic = rx_chains_static = local->rx_chains; 986 987 rcu_read_unlock(); 988 989 if (!local->use_chanctx) { 990 if (rx_chains_static > 1) 991 local->smps_mode = IEEE80211_SMPS_OFF; 992 else if (rx_chains_dynamic > 1) 993 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 994 else 995 local->smps_mode = IEEE80211_SMPS_STATIC; 996 ieee80211_hw_config(local, 0); 997 } 998 999 if (rx_chains_static == chanctx->conf.rx_chains_static && 1000 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 1001 return; 1002 1003 chanctx->conf.rx_chains_static = rx_chains_static; 1004 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 1005 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 1006 } 1007 1008 static void 1009 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, 1010 bool clear) 1011 { 1012 struct ieee80211_sub_if_data *sdata = link->sdata; 1013 unsigned int link_id = link->link_id; 1014 struct ieee80211_bss_conf *link_conf = link->conf; 1015 struct ieee80211_local *local __maybe_unused = sdata->local; 1016 struct ieee80211_sub_if_data *vlan; 1017 struct ieee80211_chanctx_conf *conf; 1018 1019 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 1020 return; 1021 1022 lockdep_assert_wiphy(local->hw.wiphy); 1023 1024 /* Check that conf exists, even when clearing this function 1025 * must be called with the AP's channel context still there 1026 * as it would otherwise cause VLANs to have an invalid 1027 * channel context pointer for a while, possibly pointing 1028 * to a channel context that has already been freed. 1029 */ 1030 conf = rcu_dereference_protected(link_conf->chanctx_conf, 1031 lockdep_is_held(&local->hw.wiphy->mtx)); 1032 WARN_ON(!conf); 1033 1034 if (clear) 1035 conf = NULL; 1036 1037 rcu_read_lock(); 1038 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 1039 struct ieee80211_bss_conf *vlan_conf; 1040 1041 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]); 1042 if (WARN_ON(!vlan_conf)) 1043 continue; 1044 1045 rcu_assign_pointer(vlan_conf->chanctx_conf, conf); 1046 } 1047 rcu_read_unlock(); 1048 } 1049 1050 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, 1051 bool clear) 1052 { 1053 struct ieee80211_local *local = link->sdata->local; 1054 1055 lockdep_assert_wiphy(local->hw.wiphy); 1056 1057 __ieee80211_link_copy_chanctx_to_vlans(link, clear); 1058 } 1059 1060 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link) 1061 { 1062 struct ieee80211_sub_if_data *sdata = link->sdata; 1063 struct ieee80211_chanctx *ctx = link->reserved_chanctx; 1064 1065 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1066 1067 if (WARN_ON(!ctx)) 1068 return -EINVAL; 1069 1070 list_del(&link->reserved_chanctx_list); 1071 link->reserved_chanctx = NULL; 1072 1073 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 1074 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1075 if (WARN_ON(!ctx->replace_ctx)) 1076 return -EINVAL; 1077 1078 WARN_ON(ctx->replace_ctx->replace_state != 1079 IEEE80211_CHANCTX_WILL_BE_REPLACED); 1080 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 1081 1082 ctx->replace_ctx->replace_ctx = NULL; 1083 ctx->replace_ctx->replace_state = 1084 IEEE80211_CHANCTX_REPLACE_NONE; 1085 1086 list_del_rcu(&ctx->list); 1087 kfree_rcu(ctx, rcu_head); 1088 } else { 1089 ieee80211_free_chanctx(sdata->local, ctx); 1090 } 1091 } 1092 1093 return 0; 1094 } 1095 1096 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link, 1097 const struct cfg80211_chan_def *chandef, 1098 enum ieee80211_chanctx_mode mode, 1099 bool radar_required) 1100 { 1101 struct ieee80211_sub_if_data *sdata = link->sdata; 1102 struct ieee80211_local *local = sdata->local; 1103 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 1104 1105 lockdep_assert_wiphy(local->hw.wiphy); 1106 1107 curr_ctx = ieee80211_link_get_chanctx(link); 1108 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 1109 return -ENOTSUPP; 1110 1111 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 1112 if (!new_ctx) { 1113 if (ieee80211_can_create_new_chanctx(local)) { 1114 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 1115 if (IS_ERR(new_ctx)) 1116 return PTR_ERR(new_ctx); 1117 } else { 1118 if (!curr_ctx || 1119 (curr_ctx->replace_state == 1120 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1121 !list_empty(&curr_ctx->reserved_links)) { 1122 /* 1123 * Another link already requested this context 1124 * for a reservation. Find another one hoping 1125 * all links assigned to it will also switch 1126 * soon enough. 1127 * 1128 * TODO: This needs a little more work as some 1129 * cases (more than 2 chanctx capable devices) 1130 * may fail which could otherwise succeed 1131 * provided some channel context juggling was 1132 * performed. 1133 * 1134 * Consider ctx1..3, link1..6, each ctx has 2 1135 * links. link1 and link2 from ctx1 request new 1136 * different chandefs starting 2 in-place 1137 * reserations with ctx4 and ctx5 replacing 1138 * ctx1 and ctx2 respectively. Next link5 and 1139 * link6 from ctx3 reserve ctx4. If link3 and 1140 * link4 remain on ctx2 as they are then this 1141 * fails unless `replace_ctx` from ctx5 is 1142 * replaced with ctx3. 1143 */ 1144 list_for_each_entry(ctx, &local->chanctx_list, 1145 list) { 1146 if (ctx->replace_state != 1147 IEEE80211_CHANCTX_REPLACE_NONE) 1148 continue; 1149 1150 if (!list_empty(&ctx->reserved_links)) 1151 continue; 1152 1153 curr_ctx = ctx; 1154 break; 1155 } 1156 } 1157 1158 /* 1159 * If that's true then all available contexts already 1160 * have reservations and cannot be used. 1161 */ 1162 if (!curr_ctx || 1163 (curr_ctx->replace_state == 1164 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1165 !list_empty(&curr_ctx->reserved_links)) 1166 return -EBUSY; 1167 1168 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 1169 if (!new_ctx) 1170 return -ENOMEM; 1171 1172 new_ctx->replace_ctx = curr_ctx; 1173 new_ctx->replace_state = 1174 IEEE80211_CHANCTX_REPLACES_OTHER; 1175 1176 curr_ctx->replace_ctx = new_ctx; 1177 curr_ctx->replace_state = 1178 IEEE80211_CHANCTX_WILL_BE_REPLACED; 1179 1180 list_add_rcu(&new_ctx->list, &local->chanctx_list); 1181 } 1182 } 1183 1184 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links); 1185 link->reserved_chanctx = new_ctx; 1186 link->reserved_chandef = *chandef; 1187 link->reserved_radar_required = radar_required; 1188 link->reserved_ready = false; 1189 1190 return 0; 1191 } 1192 1193 static void 1194 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link) 1195 { 1196 struct ieee80211_sub_if_data *sdata = link->sdata; 1197 1198 switch (sdata->vif.type) { 1199 case NL80211_IFTYPE_ADHOC: 1200 case NL80211_IFTYPE_AP: 1201 case NL80211_IFTYPE_MESH_POINT: 1202 case NL80211_IFTYPE_OCB: 1203 wiphy_work_queue(sdata->local->hw.wiphy, 1204 &link->csa_finalize_work); 1205 break; 1206 case NL80211_IFTYPE_STATION: 1207 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1208 &link->u.mgd.chswitch_work, 0); 1209 break; 1210 case NL80211_IFTYPE_UNSPECIFIED: 1211 case NL80211_IFTYPE_AP_VLAN: 1212 case NL80211_IFTYPE_WDS: 1213 case NL80211_IFTYPE_MONITOR: 1214 case NL80211_IFTYPE_P2P_CLIENT: 1215 case NL80211_IFTYPE_P2P_GO: 1216 case NL80211_IFTYPE_P2P_DEVICE: 1217 case NL80211_IFTYPE_NAN: 1218 case NUM_NL80211_IFTYPES: 1219 WARN_ON(1); 1220 break; 1221 } 1222 } 1223 1224 static void 1225 ieee80211_link_update_chandef(struct ieee80211_link_data *link, 1226 const struct cfg80211_chan_def *chandef) 1227 { 1228 struct ieee80211_sub_if_data *sdata = link->sdata; 1229 unsigned int link_id = link->link_id; 1230 struct ieee80211_sub_if_data *vlan; 1231 1232 link->conf->chandef = *chandef; 1233 1234 if (sdata->vif.type != NL80211_IFTYPE_AP) 1235 return; 1236 1237 rcu_read_lock(); 1238 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 1239 struct ieee80211_bss_conf *vlan_conf; 1240 1241 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]); 1242 if (WARN_ON(!vlan_conf)) 1243 continue; 1244 1245 vlan_conf->chandef = *chandef; 1246 } 1247 rcu_read_unlock(); 1248 } 1249 1250 static int 1251 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link) 1252 { 1253 struct ieee80211_sub_if_data *sdata = link->sdata; 1254 struct ieee80211_bss_conf *link_conf = link->conf; 1255 struct ieee80211_local *local = sdata->local; 1256 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1257 struct ieee80211_chanctx *old_ctx, *new_ctx; 1258 const struct cfg80211_chan_def *chandef; 1259 u64 changed = 0; 1260 int err; 1261 1262 lockdep_assert_wiphy(local->hw.wiphy); 1263 1264 new_ctx = link->reserved_chanctx; 1265 old_ctx = ieee80211_link_get_chanctx(link); 1266 1267 if (WARN_ON(!link->reserved_ready)) 1268 return -EBUSY; 1269 1270 if (WARN_ON(!new_ctx)) 1271 return -EINVAL; 1272 1273 if (WARN_ON(!old_ctx)) 1274 return -EINVAL; 1275 1276 if (WARN_ON(new_ctx->replace_state == 1277 IEEE80211_CHANCTX_REPLACES_OTHER)) 1278 return -EINVAL; 1279 1280 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1281 &link->reserved_chandef); 1282 if (WARN_ON(!chandef)) 1283 return -EINVAL; 1284 1285 if (link_conf->chandef.width != link->reserved_chandef.width) 1286 changed = BSS_CHANGED_BANDWIDTH; 1287 1288 ieee80211_link_update_chandef(link, &link->reserved_chandef); 1289 1290 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef, link); 1291 1292 vif_chsw[0].vif = &sdata->vif; 1293 vif_chsw[0].old_ctx = &old_ctx->conf; 1294 vif_chsw[0].new_ctx = &new_ctx->conf; 1295 vif_chsw[0].link_conf = link->conf; 1296 1297 list_del(&link->reserved_chanctx_list); 1298 link->reserved_chanctx = NULL; 1299 1300 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1301 CHANCTX_SWMODE_REASSIGN_VIF); 1302 if (err) { 1303 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1304 ieee80211_free_chanctx(local, new_ctx); 1305 1306 goto out; 1307 } 1308 1309 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links); 1310 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf); 1311 1312 if (sdata->vif.type == NL80211_IFTYPE_AP) 1313 __ieee80211_link_copy_chanctx_to_vlans(link, false); 1314 1315 ieee80211_check_fast_xmit_iface(sdata); 1316 1317 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1318 ieee80211_free_chanctx(local, old_ctx); 1319 1320 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL); 1321 ieee80211_recalc_smps_chanctx(local, new_ctx); 1322 ieee80211_recalc_radar_chanctx(local, new_ctx); 1323 1324 if (changed) 1325 ieee80211_link_info_change_notify(sdata, link, changed); 1326 1327 out: 1328 ieee80211_link_chanctx_reservation_complete(link); 1329 return err; 1330 } 1331 1332 static int 1333 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link) 1334 { 1335 struct ieee80211_sub_if_data *sdata = link->sdata; 1336 struct ieee80211_local *local = sdata->local; 1337 struct ieee80211_chanctx *old_ctx, *new_ctx; 1338 const struct cfg80211_chan_def *chandef; 1339 int err; 1340 1341 old_ctx = ieee80211_link_get_chanctx(link); 1342 new_ctx = link->reserved_chanctx; 1343 1344 if (WARN_ON(!link->reserved_ready)) 1345 return -EINVAL; 1346 1347 if (WARN_ON(old_ctx)) 1348 return -EINVAL; 1349 1350 if (WARN_ON(!new_ctx)) 1351 return -EINVAL; 1352 1353 if (WARN_ON(new_ctx->replace_state == 1354 IEEE80211_CHANCTX_REPLACES_OTHER)) 1355 return -EINVAL; 1356 1357 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1358 &link->reserved_chandef); 1359 if (WARN_ON(!chandef)) 1360 return -EINVAL; 1361 1362 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef); 1363 1364 list_del(&link->reserved_chanctx_list); 1365 link->reserved_chanctx = NULL; 1366 1367 err = ieee80211_assign_link_chanctx(link, new_ctx); 1368 if (err) { 1369 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1370 ieee80211_free_chanctx(local, new_ctx); 1371 1372 goto out; 1373 } 1374 1375 out: 1376 ieee80211_link_chanctx_reservation_complete(link); 1377 return err; 1378 } 1379 1380 static bool 1381 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link) 1382 { 1383 struct ieee80211_sub_if_data *sdata = link->sdata; 1384 struct ieee80211_chanctx *old_ctx, *new_ctx; 1385 1386 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1387 1388 new_ctx = link->reserved_chanctx; 1389 old_ctx = ieee80211_link_get_chanctx(link); 1390 1391 if (!old_ctx) 1392 return false; 1393 1394 if (WARN_ON(!new_ctx)) 1395 return false; 1396 1397 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1398 return false; 1399 1400 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1401 return false; 1402 1403 return true; 1404 } 1405 1406 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1407 struct ieee80211_chanctx *new_ctx) 1408 { 1409 const struct cfg80211_chan_def *chandef; 1410 1411 lockdep_assert_wiphy(local->hw.wiphy); 1412 1413 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1414 if (WARN_ON(!chandef)) 1415 return -EINVAL; 1416 1417 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1418 local->_oper_chandef = *chandef; 1419 ieee80211_hw_config(local, 0); 1420 1421 return 0; 1422 } 1423 1424 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1425 int n_vifs) 1426 { 1427 struct ieee80211_vif_chanctx_switch *vif_chsw; 1428 struct ieee80211_link_data *link; 1429 struct ieee80211_chanctx *ctx, *old_ctx; 1430 int i, err; 1431 1432 lockdep_assert_wiphy(local->hw.wiphy); 1433 1434 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1435 if (!vif_chsw) 1436 return -ENOMEM; 1437 1438 i = 0; 1439 list_for_each_entry(ctx, &local->chanctx_list, list) { 1440 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1441 continue; 1442 1443 if (WARN_ON(!ctx->replace_ctx)) { 1444 err = -EINVAL; 1445 goto out; 1446 } 1447 1448 list_for_each_entry(link, &ctx->reserved_links, 1449 reserved_chanctx_list) { 1450 if (!ieee80211_link_has_in_place_reservation(link)) 1451 continue; 1452 1453 old_ctx = ieee80211_link_get_chanctx(link); 1454 vif_chsw[i].vif = &link->sdata->vif; 1455 vif_chsw[i].old_ctx = &old_ctx->conf; 1456 vif_chsw[i].new_ctx = &ctx->conf; 1457 vif_chsw[i].link_conf = link->conf; 1458 1459 i++; 1460 } 1461 } 1462 1463 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1464 CHANCTX_SWMODE_SWAP_CONTEXTS); 1465 1466 out: 1467 kfree(vif_chsw); 1468 return err; 1469 } 1470 1471 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1472 { 1473 struct ieee80211_chanctx *ctx; 1474 int err; 1475 1476 lockdep_assert_wiphy(local->hw.wiphy); 1477 1478 list_for_each_entry(ctx, &local->chanctx_list, list) { 1479 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1480 continue; 1481 1482 if (!list_empty(&ctx->replace_ctx->assigned_links)) 1483 continue; 1484 1485 ieee80211_del_chanctx(local, ctx->replace_ctx); 1486 err = ieee80211_add_chanctx(local, ctx); 1487 if (err) 1488 goto err; 1489 } 1490 1491 return 0; 1492 1493 err: 1494 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1495 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1496 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1497 continue; 1498 1499 if (!list_empty(&ctx->replace_ctx->assigned_links)) 1500 continue; 1501 1502 ieee80211_del_chanctx(local, ctx); 1503 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1504 } 1505 1506 return err; 1507 } 1508 1509 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1510 { 1511 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1512 struct ieee80211_chanctx *new_ctx = NULL; 1513 int err, n_assigned, n_reserved, n_ready; 1514 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1515 1516 lockdep_assert_wiphy(local->hw.wiphy); 1517 1518 /* 1519 * If there are 2 independent pairs of channel contexts performing 1520 * cross-switch of their vifs this code will still wait until both are 1521 * ready even though it could be possible to switch one before the 1522 * other is ready. 1523 * 1524 * For practical reasons and code simplicity just do a single huge 1525 * switch. 1526 */ 1527 1528 /* 1529 * Verify if the reservation is still feasible. 1530 * - if it's not then disconnect 1531 * - if it is but not all vifs necessary are ready then defer 1532 */ 1533 1534 list_for_each_entry(ctx, &local->chanctx_list, list) { 1535 struct ieee80211_link_data *link; 1536 1537 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1538 continue; 1539 1540 if (WARN_ON(!ctx->replace_ctx)) { 1541 err = -EINVAL; 1542 goto err; 1543 } 1544 1545 if (!local->use_chanctx) 1546 new_ctx = ctx; 1547 1548 n_ctx++; 1549 1550 n_assigned = 0; 1551 n_reserved = 0; 1552 n_ready = 0; 1553 1554 list_for_each_entry(link, &ctx->replace_ctx->assigned_links, 1555 assigned_chanctx_list) { 1556 n_assigned++; 1557 if (link->reserved_chanctx) { 1558 n_reserved++; 1559 if (link->reserved_ready) 1560 n_ready++; 1561 } 1562 } 1563 1564 if (n_assigned != n_reserved) { 1565 if (n_ready == n_reserved) { 1566 wiphy_info(local->hw.wiphy, 1567 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1568 err = -EBUSY; 1569 goto err; 1570 } 1571 1572 return -EAGAIN; 1573 } 1574 1575 ctx->conf.radar_enabled = false; 1576 list_for_each_entry(link, &ctx->reserved_links, 1577 reserved_chanctx_list) { 1578 if (ieee80211_link_has_in_place_reservation(link) && 1579 !link->reserved_ready) 1580 return -EAGAIN; 1581 1582 old_ctx = ieee80211_link_get_chanctx(link); 1583 if (old_ctx) { 1584 if (old_ctx->replace_state == 1585 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1586 n_vifs_switch++; 1587 else 1588 n_vifs_assign++; 1589 } else { 1590 n_vifs_ctxless++; 1591 } 1592 1593 if (link->reserved_radar_required) 1594 ctx->conf.radar_enabled = true; 1595 } 1596 } 1597 1598 if (WARN_ON(n_ctx == 0) || 1599 WARN_ON(n_vifs_switch == 0 && 1600 n_vifs_assign == 0 && 1601 n_vifs_ctxless == 0) || 1602 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1603 WARN_ON(!new_ctx && !local->use_chanctx)) { 1604 err = -EINVAL; 1605 goto err; 1606 } 1607 1608 /* 1609 * All necessary vifs are ready. Perform the switch now depending on 1610 * reservations and driver capabilities. 1611 */ 1612 1613 if (local->use_chanctx) { 1614 if (n_vifs_switch > 0) { 1615 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1616 if (err) 1617 goto err; 1618 } 1619 1620 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1621 err = ieee80211_chsw_switch_ctxs(local); 1622 if (err) 1623 goto err; 1624 } 1625 } else { 1626 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1627 if (err) 1628 goto err; 1629 } 1630 1631 /* 1632 * Update all structures, values and pointers to point to new channel 1633 * context(s). 1634 */ 1635 list_for_each_entry(ctx, &local->chanctx_list, list) { 1636 struct ieee80211_link_data *link, *link_tmp; 1637 1638 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1639 continue; 1640 1641 if (WARN_ON(!ctx->replace_ctx)) { 1642 err = -EINVAL; 1643 goto err; 1644 } 1645 1646 list_for_each_entry(link, &ctx->reserved_links, 1647 reserved_chanctx_list) { 1648 struct ieee80211_sub_if_data *sdata = link->sdata; 1649 struct ieee80211_bss_conf *link_conf = link->conf; 1650 u64 changed = 0; 1651 1652 if (!ieee80211_link_has_in_place_reservation(link)) 1653 continue; 1654 1655 rcu_assign_pointer(link_conf->chanctx_conf, 1656 &ctx->conf); 1657 1658 if (sdata->vif.type == NL80211_IFTYPE_AP) 1659 __ieee80211_link_copy_chanctx_to_vlans(link, 1660 false); 1661 1662 ieee80211_check_fast_xmit_iface(sdata); 1663 1664 link->radar_required = link->reserved_radar_required; 1665 1666 if (link_conf->chandef.width != link->reserved_chandef.width) 1667 changed = BSS_CHANGED_BANDWIDTH; 1668 1669 ieee80211_link_update_chandef(link, &link->reserved_chandef); 1670 if (changed) 1671 ieee80211_link_info_change_notify(sdata, 1672 link, 1673 changed); 1674 1675 ieee80211_recalc_txpower(sdata, false); 1676 } 1677 1678 ieee80211_recalc_chanctx_chantype(local, ctx); 1679 ieee80211_recalc_smps_chanctx(local, ctx); 1680 ieee80211_recalc_radar_chanctx(local, ctx); 1681 ieee80211_recalc_chanctx_min_def(local, ctx, NULL); 1682 1683 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1684 reserved_chanctx_list) { 1685 if (ieee80211_link_get_chanctx(link) != ctx) 1686 continue; 1687 1688 list_del(&link->reserved_chanctx_list); 1689 list_move(&link->assigned_chanctx_list, 1690 &ctx->assigned_links); 1691 link->reserved_chanctx = NULL; 1692 1693 ieee80211_link_chanctx_reservation_complete(link); 1694 } 1695 1696 /* 1697 * This context might have been a dependency for an already 1698 * ready re-assign reservation interface that was deferred. Do 1699 * not propagate error to the caller though. The in-place 1700 * reservation for originally requested interface has already 1701 * succeeded at this point. 1702 */ 1703 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1704 reserved_chanctx_list) { 1705 if (WARN_ON(ieee80211_link_has_in_place_reservation(link))) 1706 continue; 1707 1708 if (WARN_ON(link->reserved_chanctx != ctx)) 1709 continue; 1710 1711 if (!link->reserved_ready) 1712 continue; 1713 1714 if (ieee80211_link_get_chanctx(link)) 1715 err = ieee80211_link_use_reserved_reassign(link); 1716 else 1717 err = ieee80211_link_use_reserved_assign(link); 1718 1719 if (err) { 1720 link_info(link, 1721 "failed to finalize (re-)assign reservation (err=%d)\n", 1722 err); 1723 ieee80211_link_unreserve_chanctx(link); 1724 cfg80211_stop_iface(local->hw.wiphy, 1725 &link->sdata->wdev, 1726 GFP_KERNEL); 1727 } 1728 } 1729 } 1730 1731 /* 1732 * Finally free old contexts 1733 */ 1734 1735 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1736 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1737 continue; 1738 1739 ctx->replace_ctx->replace_ctx = NULL; 1740 ctx->replace_ctx->replace_state = 1741 IEEE80211_CHANCTX_REPLACE_NONE; 1742 1743 list_del_rcu(&ctx->list); 1744 kfree_rcu(ctx, rcu_head); 1745 } 1746 1747 return 0; 1748 1749 err: 1750 list_for_each_entry(ctx, &local->chanctx_list, list) { 1751 struct ieee80211_link_data *link, *link_tmp; 1752 1753 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1754 continue; 1755 1756 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1757 reserved_chanctx_list) { 1758 ieee80211_link_unreserve_chanctx(link); 1759 ieee80211_link_chanctx_reservation_complete(link); 1760 } 1761 } 1762 1763 return err; 1764 } 1765 1766 static void __ieee80211_link_release_channel(struct ieee80211_link_data *link) 1767 { 1768 struct ieee80211_sub_if_data *sdata = link->sdata; 1769 struct ieee80211_bss_conf *link_conf = link->conf; 1770 struct ieee80211_local *local = sdata->local; 1771 struct ieee80211_chanctx_conf *conf; 1772 struct ieee80211_chanctx *ctx; 1773 bool use_reserved_switch = false; 1774 1775 lockdep_assert_wiphy(local->hw.wiphy); 1776 1777 conf = rcu_dereference_protected(link_conf->chanctx_conf, 1778 lockdep_is_held(&local->hw.wiphy->mtx)); 1779 if (!conf) 1780 return; 1781 1782 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1783 1784 if (link->reserved_chanctx) { 1785 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER && 1786 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1) 1787 use_reserved_switch = true; 1788 1789 ieee80211_link_unreserve_chanctx(link); 1790 } 1791 1792 ieee80211_assign_link_chanctx(link, NULL); 1793 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1794 ieee80211_free_chanctx(local, ctx); 1795 1796 link->radar_required = false; 1797 1798 /* Unreserving may ready an in-place reservation. */ 1799 if (use_reserved_switch) 1800 ieee80211_vif_use_reserved_switch(local); 1801 } 1802 1803 int ieee80211_link_use_channel(struct ieee80211_link_data *link, 1804 const struct cfg80211_chan_def *chandef, 1805 enum ieee80211_chanctx_mode mode) 1806 { 1807 struct ieee80211_sub_if_data *sdata = link->sdata; 1808 struct ieee80211_local *local = sdata->local; 1809 struct ieee80211_chanctx *ctx; 1810 u8 radar_detect_width = 0; 1811 int ret; 1812 1813 lockdep_assert_wiphy(local->hw.wiphy); 1814 1815 if (sdata->vif.active_links && 1816 !(sdata->vif.active_links & BIT(link->link_id))) { 1817 ieee80211_link_update_chandef(link, chandef); 1818 return 0; 1819 } 1820 1821 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1822 chandef, 1823 sdata->wdev.iftype); 1824 if (ret < 0) 1825 goto out; 1826 if (ret > 0) 1827 radar_detect_width = BIT(chandef->width); 1828 1829 link->radar_required = ret; 1830 1831 ret = ieee80211_check_combinations(sdata, chandef, mode, 1832 radar_detect_width); 1833 if (ret < 0) 1834 goto out; 1835 1836 __ieee80211_link_release_channel(link); 1837 1838 ctx = ieee80211_find_chanctx(local, chandef, mode); 1839 if (!ctx) 1840 ctx = ieee80211_new_chanctx(local, chandef, mode); 1841 if (IS_ERR(ctx)) { 1842 ret = PTR_ERR(ctx); 1843 goto out; 1844 } 1845 1846 ieee80211_link_update_chandef(link, chandef); 1847 1848 ret = ieee80211_assign_link_chanctx(link, ctx); 1849 if (ret) { 1850 /* if assign fails refcount stays the same */ 1851 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1852 ieee80211_free_chanctx(local, ctx); 1853 goto out; 1854 } 1855 1856 ieee80211_recalc_smps_chanctx(local, ctx); 1857 ieee80211_recalc_radar_chanctx(local, ctx); 1858 out: 1859 if (ret) 1860 link->radar_required = false; 1861 1862 return ret; 1863 } 1864 1865 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link) 1866 { 1867 struct ieee80211_sub_if_data *sdata = link->sdata; 1868 struct ieee80211_local *local = sdata->local; 1869 struct ieee80211_chanctx *new_ctx; 1870 struct ieee80211_chanctx *old_ctx; 1871 int err; 1872 1873 lockdep_assert_wiphy(local->hw.wiphy); 1874 1875 new_ctx = link->reserved_chanctx; 1876 old_ctx = ieee80211_link_get_chanctx(link); 1877 1878 if (WARN_ON(!new_ctx)) 1879 return -EINVAL; 1880 1881 if (WARN_ON(new_ctx->replace_state == 1882 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1883 return -EINVAL; 1884 1885 if (WARN_ON(link->reserved_ready)) 1886 return -EINVAL; 1887 1888 link->reserved_ready = true; 1889 1890 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1891 if (old_ctx) 1892 return ieee80211_link_use_reserved_reassign(link); 1893 1894 return ieee80211_link_use_reserved_assign(link); 1895 } 1896 1897 /* 1898 * In-place reservation may need to be finalized now either if: 1899 * a) sdata is taking part in the swapping itself and is the last one 1900 * b) sdata has switched with a re-assign reservation to an existing 1901 * context readying in-place switching of old_ctx 1902 * 1903 * In case of (b) do not propagate the error up because the requested 1904 * sdata already switched successfully. Just spill an extra warning. 1905 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1906 * interfaces upon failure. 1907 */ 1908 if ((old_ctx && 1909 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1910 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1911 err = ieee80211_vif_use_reserved_switch(local); 1912 if (err && err != -EAGAIN) { 1913 if (new_ctx->replace_state == 1914 IEEE80211_CHANCTX_REPLACES_OTHER) 1915 return err; 1916 1917 wiphy_info(local->hw.wiphy, 1918 "depending in-place reservation failed (err=%d)\n", 1919 err); 1920 } 1921 } 1922 1923 return 0; 1924 } 1925 1926 int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link, 1927 const struct cfg80211_chan_def *chandef, 1928 u64 *changed) 1929 { 1930 struct ieee80211_sub_if_data *sdata = link->sdata; 1931 struct ieee80211_bss_conf *link_conf = link->conf; 1932 struct ieee80211_local *local = sdata->local; 1933 struct ieee80211_chanctx_conf *conf; 1934 struct ieee80211_chanctx *ctx; 1935 const struct cfg80211_chan_def *compat; 1936 1937 lockdep_assert_wiphy(local->hw.wiphy); 1938 1939 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1940 IEEE80211_CHAN_DISABLED)) 1941 return -EINVAL; 1942 1943 if (cfg80211_chandef_identical(chandef, &link_conf->chandef)) 1944 return 0; 1945 1946 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1947 link_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT) 1948 return -EINVAL; 1949 1950 conf = rcu_dereference_protected(link_conf->chanctx_conf, 1951 lockdep_is_held(&local->hw.wiphy->mtx)); 1952 if (!conf) 1953 return -EINVAL; 1954 1955 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1956 1957 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1958 if (!compat) 1959 return -EINVAL; 1960 1961 switch (ctx->replace_state) { 1962 case IEEE80211_CHANCTX_REPLACE_NONE: 1963 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) 1964 return -EBUSY; 1965 break; 1966 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1967 /* TODO: Perhaps the bandwidth change could be treated as a 1968 * reservation itself? */ 1969 return -EBUSY; 1970 case IEEE80211_CHANCTX_REPLACES_OTHER: 1971 /* channel context that is going to replace another channel 1972 * context doesn't really exist and shouldn't be assigned 1973 * anywhere yet */ 1974 WARN_ON(1); 1975 break; 1976 } 1977 1978 ieee80211_link_update_chandef(link, chandef); 1979 1980 ieee80211_recalc_chanctx_chantype(local, ctx); 1981 1982 *changed |= BSS_CHANGED_BANDWIDTH; 1983 return 0; 1984 } 1985 1986 void ieee80211_link_release_channel(struct ieee80211_link_data *link) 1987 { 1988 struct ieee80211_sub_if_data *sdata = link->sdata; 1989 1990 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1991 1992 if (rcu_access_pointer(link->conf->chanctx_conf)) 1993 __ieee80211_link_release_channel(link); 1994 } 1995 1996 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link) 1997 { 1998 struct ieee80211_sub_if_data *sdata = link->sdata; 1999 unsigned int link_id = link->link_id; 2000 struct ieee80211_bss_conf *link_conf = link->conf; 2001 struct ieee80211_bss_conf *ap_conf; 2002 struct ieee80211_local *local = sdata->local; 2003 struct ieee80211_sub_if_data *ap; 2004 struct ieee80211_chanctx_conf *conf; 2005 2006 lockdep_assert_wiphy(local->hw.wiphy); 2007 2008 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 2009 return; 2010 2011 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 2012 2013 rcu_read_lock(); 2014 ap_conf = rcu_dereference(ap->vif.link_conf[link_id]); 2015 conf = rcu_dereference_protected(ap_conf->chanctx_conf, 2016 lockdep_is_held(&local->hw.wiphy->mtx)); 2017 rcu_assign_pointer(link_conf->chanctx_conf, conf); 2018 rcu_read_unlock(); 2019 } 2020 2021 void ieee80211_iter_chan_contexts_atomic( 2022 struct ieee80211_hw *hw, 2023 void (*iter)(struct ieee80211_hw *hw, 2024 struct ieee80211_chanctx_conf *chanctx_conf, 2025 void *data), 2026 void *iter_data) 2027 { 2028 struct ieee80211_local *local = hw_to_local(hw); 2029 struct ieee80211_chanctx *ctx; 2030 2031 rcu_read_lock(); 2032 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 2033 if (ctx->driver_present) 2034 iter(hw, &ctx->conf, iter_data); 2035 rcu_read_unlock(); 2036 } 2037 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 2038