1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 - channel management 4 * Copyright 2020 - 2021 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_sub_if_data *sdata; 19 int num = 0; 20 21 lockdep_assert_held(&local->chanctx_mtx); 22 23 list_for_each_entry(sdata, &ctx->assigned_vifs, 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_sub_if_data *sdata; 33 int num = 0; 34 35 lockdep_assert_held(&local->chanctx_mtx); 36 37 list_for_each_entry(sdata, &ctx->reserved_vifs, 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_held(&local->chanctx_mtx); 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_held(&local->chanctx_mtx); 66 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); 67 } 68 69 static struct ieee80211_chanctx * 70 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata) 71 { 72 struct ieee80211_local *local __maybe_unused = sdata->local; 73 struct ieee80211_chanctx_conf *conf; 74 75 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 76 lockdep_is_held(&local->chanctx_mtx)); 77 if (!conf) 78 return NULL; 79 80 return container_of(conf, struct ieee80211_chanctx, conf); 81 } 82 83 static const struct cfg80211_chan_def * 84 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local, 85 struct ieee80211_chanctx *ctx, 86 const struct cfg80211_chan_def *compat) 87 { 88 struct ieee80211_sub_if_data *sdata; 89 90 lockdep_assert_held(&local->chanctx_mtx); 91 92 list_for_each_entry(sdata, &ctx->reserved_vifs, 93 reserved_chanctx_list) { 94 if (!compat) 95 compat = &sdata->reserved_chandef; 96 97 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef, 98 compat); 99 if (!compat) 100 break; 101 } 102 103 return compat; 104 } 105 106 static const struct cfg80211_chan_def * 107 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local, 108 struct ieee80211_chanctx *ctx, 109 const struct cfg80211_chan_def *compat) 110 { 111 struct ieee80211_sub_if_data *sdata; 112 113 lockdep_assert_held(&local->chanctx_mtx); 114 115 list_for_each_entry(sdata, &ctx->assigned_vifs, 116 assigned_chanctx_list) { 117 if (sdata->reserved_chanctx != NULL) 118 continue; 119 120 if (!compat) 121 compat = &sdata->vif.bss_conf.chandef; 122 123 compat = cfg80211_chandef_compatible( 124 &sdata->vif.bss_conf.chandef, compat); 125 if (!compat) 126 break; 127 } 128 129 return compat; 130 } 131 132 static const struct cfg80211_chan_def * 133 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local, 134 struct ieee80211_chanctx *ctx, 135 const struct cfg80211_chan_def *compat) 136 { 137 lockdep_assert_held(&local->chanctx_mtx); 138 139 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat); 140 if (!compat) 141 return NULL; 142 143 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat); 144 if (!compat) 145 return NULL; 146 147 return compat; 148 } 149 150 static bool 151 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local, 152 struct ieee80211_chanctx *ctx, 153 const struct cfg80211_chan_def *def) 154 { 155 lockdep_assert_held(&local->chanctx_mtx); 156 157 if (ieee80211_chanctx_combined_chandef(local, ctx, def)) 158 return true; 159 160 if (!list_empty(&ctx->reserved_vifs) && 161 ieee80211_chanctx_reserved_chandef(local, ctx, def)) 162 return true; 163 164 return false; 165 } 166 167 static struct ieee80211_chanctx * 168 ieee80211_find_reservation_chanctx(struct ieee80211_local *local, 169 const struct cfg80211_chan_def *chandef, 170 enum ieee80211_chanctx_mode mode) 171 { 172 struct ieee80211_chanctx *ctx; 173 174 lockdep_assert_held(&local->chanctx_mtx); 175 176 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 177 return NULL; 178 179 list_for_each_entry(ctx, &local->chanctx_list, list) { 180 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 181 continue; 182 183 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 184 continue; 185 186 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx, 187 chandef)) 188 continue; 189 190 return ctx; 191 } 192 193 return NULL; 194 } 195 196 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta) 197 { 198 enum ieee80211_sta_rx_bandwidth width = ieee80211_sta_cap_rx_bw(sta); 199 200 switch (width) { 201 case IEEE80211_STA_RX_BW_20: 202 if (sta->sta.ht_cap.ht_supported) 203 return NL80211_CHAN_WIDTH_20; 204 else 205 return NL80211_CHAN_WIDTH_20_NOHT; 206 case IEEE80211_STA_RX_BW_40: 207 return NL80211_CHAN_WIDTH_40; 208 case IEEE80211_STA_RX_BW_80: 209 return NL80211_CHAN_WIDTH_80; 210 case IEEE80211_STA_RX_BW_160: 211 /* 212 * This applied for both 160 and 80+80. since we use 213 * the returned value to consider degradation of 214 * ctx->conf.min_def, we have to make sure to take 215 * the bigger one (NL80211_CHAN_WIDTH_160). 216 * Otherwise we might try degrading even when not 217 * needed, as the max required sta_bw returned (80+80) 218 * might be smaller than the configured bw (160). 219 */ 220 return NL80211_CHAN_WIDTH_160; 221 default: 222 WARN_ON(1); 223 return NL80211_CHAN_WIDTH_20; 224 } 225 } 226 227 static enum nl80211_chan_width 228 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata) 229 { 230 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 231 struct sta_info *sta; 232 233 rcu_read_lock(); 234 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 235 if (sdata != sta->sdata && 236 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 237 continue; 238 239 max_bw = max(max_bw, ieee80211_get_sta_bw(sta)); 240 } 241 rcu_read_unlock(); 242 243 return max_bw; 244 } 245 246 static enum nl80211_chan_width 247 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 248 struct ieee80211_chanctx_conf *conf) 249 { 250 struct ieee80211_sub_if_data *sdata; 251 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 252 253 rcu_read_lock(); 254 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 255 struct ieee80211_vif *vif = &sdata->vif; 256 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 257 258 if (!ieee80211_sdata_running(sdata)) 259 continue; 260 261 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 262 continue; 263 264 switch (vif->type) { 265 case NL80211_IFTYPE_AP: 266 case NL80211_IFTYPE_AP_VLAN: 267 width = ieee80211_get_max_required_bw(sdata); 268 break; 269 case NL80211_IFTYPE_STATION: 270 /* 271 * The ap's sta->bandwidth is not set yet at this 272 * point, so take the width from the chandef, but 273 * account also for TDLS peers 274 */ 275 width = max(vif->bss_conf.chandef.width, 276 ieee80211_get_max_required_bw(sdata)); 277 break; 278 case NL80211_IFTYPE_P2P_DEVICE: 279 case NL80211_IFTYPE_NAN: 280 continue; 281 case NL80211_IFTYPE_ADHOC: 282 case NL80211_IFTYPE_MESH_POINT: 283 case NL80211_IFTYPE_OCB: 284 width = vif->bss_conf.chandef.width; 285 break; 286 case NL80211_IFTYPE_WDS: 287 case NL80211_IFTYPE_UNSPECIFIED: 288 case NUM_NL80211_IFTYPES: 289 case NL80211_IFTYPE_MONITOR: 290 case NL80211_IFTYPE_P2P_CLIENT: 291 case NL80211_IFTYPE_P2P_GO: 292 WARN_ON_ONCE(1); 293 } 294 max_bw = max(max_bw, width); 295 } 296 297 /* use the configured bandwidth in case of monitor interface */ 298 sdata = rcu_dereference(local->monitor_sdata); 299 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 300 max_bw = max(max_bw, conf->def.width); 301 302 rcu_read_unlock(); 303 304 return max_bw; 305 } 306 307 /* 308 * recalc the min required chan width of the channel context, which is 309 * the max of min required widths of all the interfaces bound to this 310 * channel context. 311 */ 312 static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 313 struct ieee80211_chanctx *ctx) 314 { 315 enum nl80211_chan_width max_bw; 316 struct cfg80211_chan_def min_def; 317 318 lockdep_assert_held(&local->chanctx_mtx); 319 320 /* don't optimize non-20MHz based and radar_enabled confs */ 321 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 322 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 323 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 || 324 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 || 325 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 || 326 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 || 327 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 || 328 ctx->conf.radar_enabled) { 329 ctx->conf.min_def = ctx->conf.def; 330 return 0; 331 } 332 333 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 334 335 /* downgrade chandef up to max_bw */ 336 min_def = ctx->conf.def; 337 while (min_def.width > max_bw) 338 ieee80211_chandef_downgrade(&min_def); 339 340 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 341 return 0; 342 343 ctx->conf.min_def = min_def; 344 if (!ctx->driver_present) 345 return 0; 346 347 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH; 348 } 349 350 /* calling this function is assuming that station vif is updated to 351 * lates changes by calling ieee80211_vif_update_chandef 352 */ 353 static void ieee80211_chan_bw_change(struct ieee80211_local *local, 354 struct ieee80211_chanctx *ctx, 355 bool narrowed) 356 { 357 struct sta_info *sta; 358 struct ieee80211_supported_band *sband = 359 local->hw.wiphy->bands[ctx->conf.def.chan->band]; 360 361 rcu_read_lock(); 362 list_for_each_entry_rcu(sta, &local->sta_list, 363 list) { 364 enum ieee80211_sta_rx_bandwidth new_sta_bw; 365 366 if (!ieee80211_sdata_running(sta->sdata)) 367 continue; 368 369 if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) != 370 &ctx->conf) 371 continue; 372 373 new_sta_bw = ieee80211_sta_cur_vht_bw(sta); 374 375 /* nothing change */ 376 if (new_sta_bw == sta->sta.bandwidth) 377 continue; 378 379 /* vif changed to narrow BW and narrow BW for station wasn't 380 * requested or vise versa */ 381 if ((new_sta_bw < sta->sta.bandwidth) == !narrowed) 382 continue; 383 384 sta->sta.bandwidth = new_sta_bw; 385 rate_control_rate_update(local, sband, sta, 386 IEEE80211_RC_BW_CHANGED); 387 } 388 rcu_read_unlock(); 389 } 390 391 /* 392 * recalc the min required chan width of the channel context, which is 393 * the max of min required widths of all the interfaces bound to this 394 * channel context. 395 */ 396 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 397 struct ieee80211_chanctx *ctx) 398 { 399 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx); 400 401 if (!changed) 402 return; 403 404 /* check is BW narrowed */ 405 ieee80211_chan_bw_change(local, ctx, true); 406 407 drv_change_chanctx(local, ctx, changed); 408 409 /* check is BW wider */ 410 ieee80211_chan_bw_change(local, ctx, false); 411 } 412 413 static void ieee80211_change_chanctx(struct ieee80211_local *local, 414 struct ieee80211_chanctx *ctx, 415 struct ieee80211_chanctx *old_ctx, 416 const struct cfg80211_chan_def *chandef) 417 { 418 u32 changed; 419 420 /* expected to handle only 20/40/80/160 channel widths */ 421 switch (chandef->width) { 422 case NL80211_CHAN_WIDTH_20_NOHT: 423 case NL80211_CHAN_WIDTH_20: 424 case NL80211_CHAN_WIDTH_40: 425 case NL80211_CHAN_WIDTH_80: 426 case NL80211_CHAN_WIDTH_80P80: 427 case NL80211_CHAN_WIDTH_160: 428 break; 429 default: 430 WARN_ON(1); 431 } 432 433 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def 434 * due to maybe not returning from it, e.g in case new context was added 435 * first time with all parameters up to date. 436 */ 437 ieee80211_chan_bw_change(local, old_ctx, true); 438 439 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 440 ieee80211_recalc_chanctx_min_def(local, ctx); 441 return; 442 } 443 444 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 445 446 ctx->conf.def = *chandef; 447 448 /* check if min chanctx also changed */ 449 changed = IEEE80211_CHANCTX_CHANGE_WIDTH | 450 _ieee80211_recalc_chanctx_min_def(local, ctx); 451 drv_change_chanctx(local, ctx, changed); 452 453 if (!local->use_chanctx) { 454 local->_oper_chandef = *chandef; 455 ieee80211_hw_config(local, 0); 456 } 457 458 /* check is BW wider */ 459 ieee80211_chan_bw_change(local, old_ctx, false); 460 } 461 462 static struct ieee80211_chanctx * 463 ieee80211_find_chanctx(struct ieee80211_local *local, 464 const struct cfg80211_chan_def *chandef, 465 enum ieee80211_chanctx_mode mode) 466 { 467 struct ieee80211_chanctx *ctx; 468 469 lockdep_assert_held(&local->chanctx_mtx); 470 471 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 472 return NULL; 473 474 list_for_each_entry(ctx, &local->chanctx_list, list) { 475 const struct cfg80211_chan_def *compat; 476 477 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 478 continue; 479 480 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 481 continue; 482 483 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 484 if (!compat) 485 continue; 486 487 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 488 compat); 489 if (!compat) 490 continue; 491 492 ieee80211_change_chanctx(local, ctx, ctx, compat); 493 494 return ctx; 495 } 496 497 return NULL; 498 } 499 500 bool ieee80211_is_radar_required(struct ieee80211_local *local) 501 { 502 struct ieee80211_sub_if_data *sdata; 503 504 lockdep_assert_held(&local->mtx); 505 506 rcu_read_lock(); 507 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 508 if (sdata->radar_required) { 509 rcu_read_unlock(); 510 return true; 511 } 512 } 513 rcu_read_unlock(); 514 515 return false; 516 } 517 518 static bool 519 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 520 struct ieee80211_chanctx *ctx) 521 { 522 struct ieee80211_chanctx_conf *conf = &ctx->conf; 523 struct ieee80211_sub_if_data *sdata; 524 bool required = false; 525 526 lockdep_assert_held(&local->chanctx_mtx); 527 lockdep_assert_held(&local->mtx); 528 529 rcu_read_lock(); 530 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 531 if (!ieee80211_sdata_running(sdata)) 532 continue; 533 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 534 continue; 535 if (!sdata->radar_required) 536 continue; 537 538 required = true; 539 break; 540 } 541 rcu_read_unlock(); 542 543 return required; 544 } 545 546 static struct ieee80211_chanctx * 547 ieee80211_alloc_chanctx(struct ieee80211_local *local, 548 const struct cfg80211_chan_def *chandef, 549 enum ieee80211_chanctx_mode mode) 550 { 551 struct ieee80211_chanctx *ctx; 552 553 lockdep_assert_held(&local->chanctx_mtx); 554 555 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 556 if (!ctx) 557 return NULL; 558 559 INIT_LIST_HEAD(&ctx->assigned_vifs); 560 INIT_LIST_HEAD(&ctx->reserved_vifs); 561 ctx->conf.def = *chandef; 562 ctx->conf.rx_chains_static = 1; 563 ctx->conf.rx_chains_dynamic = 1; 564 ctx->mode = mode; 565 ctx->conf.radar_enabled = false; 566 ieee80211_recalc_chanctx_min_def(local, ctx); 567 568 return ctx; 569 } 570 571 static int ieee80211_add_chanctx(struct ieee80211_local *local, 572 struct ieee80211_chanctx *ctx) 573 { 574 u32 changed; 575 int err; 576 577 lockdep_assert_held(&local->mtx); 578 lockdep_assert_held(&local->chanctx_mtx); 579 580 if (!local->use_chanctx) 581 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 582 583 /* turn idle off *before* setting channel -- some drivers need that */ 584 changed = ieee80211_idle_off(local); 585 if (changed) 586 ieee80211_hw_config(local, changed); 587 588 if (!local->use_chanctx) { 589 local->_oper_chandef = ctx->conf.def; 590 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 591 } else { 592 err = drv_add_chanctx(local, ctx); 593 if (err) { 594 ieee80211_recalc_idle(local); 595 return err; 596 } 597 } 598 599 return 0; 600 } 601 602 static struct ieee80211_chanctx * 603 ieee80211_new_chanctx(struct ieee80211_local *local, 604 const struct cfg80211_chan_def *chandef, 605 enum ieee80211_chanctx_mode mode) 606 { 607 struct ieee80211_chanctx *ctx; 608 int err; 609 610 lockdep_assert_held(&local->mtx); 611 lockdep_assert_held(&local->chanctx_mtx); 612 613 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 614 if (!ctx) 615 return ERR_PTR(-ENOMEM); 616 617 err = ieee80211_add_chanctx(local, ctx); 618 if (err) { 619 kfree(ctx); 620 return ERR_PTR(err); 621 } 622 623 list_add_rcu(&ctx->list, &local->chanctx_list); 624 return ctx; 625 } 626 627 static void ieee80211_del_chanctx(struct ieee80211_local *local, 628 struct ieee80211_chanctx *ctx) 629 { 630 lockdep_assert_held(&local->chanctx_mtx); 631 632 if (!local->use_chanctx) { 633 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 634 /* S1G doesn't have 20MHz, so get the correct width for the 635 * current channel. 636 */ 637 if (chandef->chan->band == NL80211_BAND_S1GHZ) 638 chandef->width = 639 ieee80211_s1g_channel_width(chandef->chan); 640 else 641 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 642 chandef->center_freq1 = chandef->chan->center_freq; 643 chandef->freq1_offset = chandef->chan->freq_offset; 644 chandef->center_freq2 = 0; 645 646 /* NOTE: Disabling radar is only valid here for 647 * single channel context. To be sure, check it ... 648 */ 649 WARN_ON(local->hw.conf.radar_enabled && 650 !list_empty(&local->chanctx_list)); 651 652 local->hw.conf.radar_enabled = false; 653 654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 655 } else { 656 drv_remove_chanctx(local, ctx); 657 } 658 659 ieee80211_recalc_idle(local); 660 } 661 662 static void ieee80211_free_chanctx(struct ieee80211_local *local, 663 struct ieee80211_chanctx *ctx) 664 { 665 lockdep_assert_held(&local->chanctx_mtx); 666 667 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 668 669 list_del_rcu(&ctx->list); 670 ieee80211_del_chanctx(local, ctx); 671 kfree_rcu(ctx, rcu_head); 672 } 673 674 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 675 struct ieee80211_chanctx *ctx) 676 { 677 struct ieee80211_chanctx_conf *conf = &ctx->conf; 678 struct ieee80211_sub_if_data *sdata; 679 const struct cfg80211_chan_def *compat = NULL; 680 struct sta_info *sta; 681 682 lockdep_assert_held(&local->chanctx_mtx); 683 684 rcu_read_lock(); 685 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 686 687 if (!ieee80211_sdata_running(sdata)) 688 continue; 689 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 690 continue; 691 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 692 continue; 693 694 if (!compat) 695 compat = &sdata->vif.bss_conf.chandef; 696 697 compat = cfg80211_chandef_compatible( 698 &sdata->vif.bss_conf.chandef, compat); 699 if (WARN_ON_ONCE(!compat)) 700 break; 701 } 702 703 /* TDLS peers can sometimes affect the chandef width */ 704 list_for_each_entry_rcu(sta, &local->sta_list, list) { 705 if (!sta->uploaded || 706 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 707 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 708 !sta->tdls_chandef.chan) 709 continue; 710 711 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 712 compat); 713 if (WARN_ON_ONCE(!compat)) 714 break; 715 } 716 rcu_read_unlock(); 717 718 if (!compat) 719 return; 720 721 ieee80211_change_chanctx(local, ctx, ctx, compat); 722 } 723 724 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 725 struct ieee80211_chanctx *chanctx) 726 { 727 bool radar_enabled; 728 729 lockdep_assert_held(&local->chanctx_mtx); 730 /* for ieee80211_is_radar_required */ 731 lockdep_assert_held(&local->mtx); 732 733 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 734 735 if (radar_enabled == chanctx->conf.radar_enabled) 736 return; 737 738 chanctx->conf.radar_enabled = radar_enabled; 739 740 if (!local->use_chanctx) { 741 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 742 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 743 } 744 745 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 746 } 747 748 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 749 struct ieee80211_chanctx *new_ctx) 750 { 751 struct ieee80211_local *local = sdata->local; 752 struct ieee80211_chanctx_conf *conf; 753 struct ieee80211_chanctx *curr_ctx = NULL; 754 int ret = 0; 755 756 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 757 return -ENOTSUPP; 758 759 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 760 lockdep_is_held(&local->chanctx_mtx)); 761 762 if (conf) { 763 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 764 765 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 766 conf = NULL; 767 list_del(&sdata->assigned_chanctx_list); 768 } 769 770 if (new_ctx) { 771 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 772 if (ret) 773 goto out; 774 775 conf = &new_ctx->conf; 776 list_add(&sdata->assigned_chanctx_list, 777 &new_ctx->assigned_vifs); 778 } 779 780 out: 781 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 782 783 sdata->vif.bss_conf.idle = !conf; 784 785 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 786 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 787 ieee80211_recalc_smps_chanctx(local, curr_ctx); 788 ieee80211_recalc_radar_chanctx(local, curr_ctx); 789 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 790 } 791 792 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 793 ieee80211_recalc_txpower(sdata, false); 794 ieee80211_recalc_chanctx_min_def(local, new_ctx); 795 } 796 797 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 798 sdata->vif.type != NL80211_IFTYPE_MONITOR) 799 ieee80211_bss_info_change_notify(sdata, 800 BSS_CHANGED_IDLE); 801 802 ieee80211_check_fast_xmit_iface(sdata); 803 804 return ret; 805 } 806 807 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 808 struct ieee80211_chanctx *chanctx) 809 { 810 struct ieee80211_sub_if_data *sdata; 811 u8 rx_chains_static, rx_chains_dynamic; 812 813 lockdep_assert_held(&local->chanctx_mtx); 814 815 rx_chains_static = 1; 816 rx_chains_dynamic = 1; 817 818 rcu_read_lock(); 819 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 820 u8 needed_static, needed_dynamic; 821 822 if (!ieee80211_sdata_running(sdata)) 823 continue; 824 825 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 826 &chanctx->conf) 827 continue; 828 829 switch (sdata->vif.type) { 830 case NL80211_IFTYPE_P2P_DEVICE: 831 case NL80211_IFTYPE_NAN: 832 continue; 833 case NL80211_IFTYPE_STATION: 834 if (!sdata->u.mgd.associated) 835 continue; 836 break; 837 case NL80211_IFTYPE_AP_VLAN: 838 continue; 839 case NL80211_IFTYPE_AP: 840 case NL80211_IFTYPE_ADHOC: 841 case NL80211_IFTYPE_MESH_POINT: 842 case NL80211_IFTYPE_OCB: 843 break; 844 default: 845 WARN_ON_ONCE(1); 846 } 847 848 switch (sdata->smps_mode) { 849 default: 850 WARN_ONCE(1, "Invalid SMPS mode %d\n", 851 sdata->smps_mode); 852 fallthrough; 853 case IEEE80211_SMPS_OFF: 854 needed_static = sdata->needed_rx_chains; 855 needed_dynamic = sdata->needed_rx_chains; 856 break; 857 case IEEE80211_SMPS_DYNAMIC: 858 needed_static = 1; 859 needed_dynamic = sdata->needed_rx_chains; 860 break; 861 case IEEE80211_SMPS_STATIC: 862 needed_static = 1; 863 needed_dynamic = 1; 864 break; 865 } 866 867 rx_chains_static = max(rx_chains_static, needed_static); 868 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 869 } 870 871 /* Disable SMPS for the monitor interface */ 872 sdata = rcu_dereference(local->monitor_sdata); 873 if (sdata && 874 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 875 rx_chains_dynamic = rx_chains_static = local->rx_chains; 876 877 rcu_read_unlock(); 878 879 if (!local->use_chanctx) { 880 if (rx_chains_static > 1) 881 local->smps_mode = IEEE80211_SMPS_OFF; 882 else if (rx_chains_dynamic > 1) 883 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 884 else 885 local->smps_mode = IEEE80211_SMPS_STATIC; 886 ieee80211_hw_config(local, 0); 887 } 888 889 if (rx_chains_static == chanctx->conf.rx_chains_static && 890 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 891 return; 892 893 chanctx->conf.rx_chains_static = rx_chains_static; 894 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 895 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 896 } 897 898 static void 899 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 900 bool clear) 901 { 902 struct ieee80211_local *local __maybe_unused = sdata->local; 903 struct ieee80211_sub_if_data *vlan; 904 struct ieee80211_chanctx_conf *conf; 905 906 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 907 return; 908 909 lockdep_assert_held(&local->mtx); 910 911 /* Check that conf exists, even when clearing this function 912 * must be called with the AP's channel context still there 913 * as it would otherwise cause VLANs to have an invalid 914 * channel context pointer for a while, possibly pointing 915 * to a channel context that has already been freed. 916 */ 917 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 918 lockdep_is_held(&local->chanctx_mtx)); 919 WARN_ON(!conf); 920 921 if (clear) 922 conf = NULL; 923 924 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 925 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 926 } 927 928 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 929 bool clear) 930 { 931 struct ieee80211_local *local = sdata->local; 932 933 mutex_lock(&local->chanctx_mtx); 934 935 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 936 937 mutex_unlock(&local->chanctx_mtx); 938 } 939 940 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 941 { 942 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 943 944 lockdep_assert_held(&sdata->local->chanctx_mtx); 945 946 if (WARN_ON(!ctx)) 947 return -EINVAL; 948 949 list_del(&sdata->reserved_chanctx_list); 950 sdata->reserved_chanctx = NULL; 951 952 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 953 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 954 if (WARN_ON(!ctx->replace_ctx)) 955 return -EINVAL; 956 957 WARN_ON(ctx->replace_ctx->replace_state != 958 IEEE80211_CHANCTX_WILL_BE_REPLACED); 959 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 960 961 ctx->replace_ctx->replace_ctx = NULL; 962 ctx->replace_ctx->replace_state = 963 IEEE80211_CHANCTX_REPLACE_NONE; 964 965 list_del_rcu(&ctx->list); 966 kfree_rcu(ctx, rcu_head); 967 } else { 968 ieee80211_free_chanctx(sdata->local, ctx); 969 } 970 } 971 972 return 0; 973 } 974 975 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 976 const struct cfg80211_chan_def *chandef, 977 enum ieee80211_chanctx_mode mode, 978 bool radar_required) 979 { 980 struct ieee80211_local *local = sdata->local; 981 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 982 983 lockdep_assert_held(&local->chanctx_mtx); 984 985 curr_ctx = ieee80211_vif_get_chanctx(sdata); 986 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 987 return -ENOTSUPP; 988 989 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 990 if (!new_ctx) { 991 if (ieee80211_can_create_new_chanctx(local)) { 992 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 993 if (IS_ERR(new_ctx)) 994 return PTR_ERR(new_ctx); 995 } else { 996 if (!curr_ctx || 997 (curr_ctx->replace_state == 998 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 999 !list_empty(&curr_ctx->reserved_vifs)) { 1000 /* 1001 * Another vif already requested this context 1002 * for a reservation. Find another one hoping 1003 * all vifs assigned to it will also switch 1004 * soon enough. 1005 * 1006 * TODO: This needs a little more work as some 1007 * cases (more than 2 chanctx capable devices) 1008 * may fail which could otherwise succeed 1009 * provided some channel context juggling was 1010 * performed. 1011 * 1012 * Consider ctx1..3, vif1..6, each ctx has 2 1013 * vifs. vif1 and vif2 from ctx1 request new 1014 * different chandefs starting 2 in-place 1015 * reserations with ctx4 and ctx5 replacing 1016 * ctx1 and ctx2 respectively. Next vif5 and 1017 * vif6 from ctx3 reserve ctx4. If vif3 and 1018 * vif4 remain on ctx2 as they are then this 1019 * fails unless `replace_ctx` from ctx5 is 1020 * replaced with ctx3. 1021 */ 1022 list_for_each_entry(ctx, &local->chanctx_list, 1023 list) { 1024 if (ctx->replace_state != 1025 IEEE80211_CHANCTX_REPLACE_NONE) 1026 continue; 1027 1028 if (!list_empty(&ctx->reserved_vifs)) 1029 continue; 1030 1031 curr_ctx = ctx; 1032 break; 1033 } 1034 } 1035 1036 /* 1037 * If that's true then all available contexts already 1038 * have reservations and cannot be used. 1039 */ 1040 if (!curr_ctx || 1041 (curr_ctx->replace_state == 1042 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1043 !list_empty(&curr_ctx->reserved_vifs)) 1044 return -EBUSY; 1045 1046 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 1047 if (!new_ctx) 1048 return -ENOMEM; 1049 1050 new_ctx->replace_ctx = curr_ctx; 1051 new_ctx->replace_state = 1052 IEEE80211_CHANCTX_REPLACES_OTHER; 1053 1054 curr_ctx->replace_ctx = new_ctx; 1055 curr_ctx->replace_state = 1056 IEEE80211_CHANCTX_WILL_BE_REPLACED; 1057 1058 list_add_rcu(&new_ctx->list, &local->chanctx_list); 1059 } 1060 } 1061 1062 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 1063 sdata->reserved_chanctx = new_ctx; 1064 sdata->reserved_chandef = *chandef; 1065 sdata->reserved_radar_required = radar_required; 1066 sdata->reserved_ready = false; 1067 1068 return 0; 1069 } 1070 1071 static void 1072 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 1073 { 1074 switch (sdata->vif.type) { 1075 case NL80211_IFTYPE_ADHOC: 1076 case NL80211_IFTYPE_AP: 1077 case NL80211_IFTYPE_MESH_POINT: 1078 case NL80211_IFTYPE_OCB: 1079 ieee80211_queue_work(&sdata->local->hw, 1080 &sdata->csa_finalize_work); 1081 break; 1082 case NL80211_IFTYPE_STATION: 1083 ieee80211_queue_work(&sdata->local->hw, 1084 &sdata->u.mgd.chswitch_work); 1085 break; 1086 case NL80211_IFTYPE_UNSPECIFIED: 1087 case NL80211_IFTYPE_AP_VLAN: 1088 case NL80211_IFTYPE_WDS: 1089 case NL80211_IFTYPE_MONITOR: 1090 case NL80211_IFTYPE_P2P_CLIENT: 1091 case NL80211_IFTYPE_P2P_GO: 1092 case NL80211_IFTYPE_P2P_DEVICE: 1093 case NL80211_IFTYPE_NAN: 1094 case NUM_NL80211_IFTYPES: 1095 WARN_ON(1); 1096 break; 1097 } 1098 } 1099 1100 static void 1101 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 1102 const struct cfg80211_chan_def *chandef) 1103 { 1104 struct ieee80211_sub_if_data *vlan; 1105 1106 sdata->vif.bss_conf.chandef = *chandef; 1107 1108 if (sdata->vif.type != NL80211_IFTYPE_AP) 1109 return; 1110 1111 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1112 vlan->vif.bss_conf.chandef = *chandef; 1113 } 1114 1115 static int 1116 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1117 { 1118 struct ieee80211_local *local = sdata->local; 1119 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1120 struct ieee80211_chanctx *old_ctx, *new_ctx; 1121 const struct cfg80211_chan_def *chandef; 1122 u32 changed = 0; 1123 int err; 1124 1125 lockdep_assert_held(&local->mtx); 1126 lockdep_assert_held(&local->chanctx_mtx); 1127 1128 new_ctx = sdata->reserved_chanctx; 1129 old_ctx = ieee80211_vif_get_chanctx(sdata); 1130 1131 if (WARN_ON(!sdata->reserved_ready)) 1132 return -EBUSY; 1133 1134 if (WARN_ON(!new_ctx)) 1135 return -EINVAL; 1136 1137 if (WARN_ON(!old_ctx)) 1138 return -EINVAL; 1139 1140 if (WARN_ON(new_ctx->replace_state == 1141 IEEE80211_CHANCTX_REPLACES_OTHER)) 1142 return -EINVAL; 1143 1144 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1145 &sdata->reserved_chandef); 1146 if (WARN_ON(!chandef)) 1147 return -EINVAL; 1148 1149 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1150 changed = BSS_CHANGED_BANDWIDTH; 1151 1152 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1153 1154 ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef); 1155 1156 vif_chsw[0].vif = &sdata->vif; 1157 vif_chsw[0].old_ctx = &old_ctx->conf; 1158 vif_chsw[0].new_ctx = &new_ctx->conf; 1159 1160 list_del(&sdata->reserved_chanctx_list); 1161 sdata->reserved_chanctx = NULL; 1162 1163 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1164 CHANCTX_SWMODE_REASSIGN_VIF); 1165 if (err) { 1166 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1167 ieee80211_free_chanctx(local, new_ctx); 1168 1169 goto out; 1170 } 1171 1172 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1173 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1174 1175 if (sdata->vif.type == NL80211_IFTYPE_AP) 1176 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1177 1178 ieee80211_check_fast_xmit_iface(sdata); 1179 1180 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1181 ieee80211_free_chanctx(local, old_ctx); 1182 1183 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1184 ieee80211_recalc_smps_chanctx(local, new_ctx); 1185 ieee80211_recalc_radar_chanctx(local, new_ctx); 1186 1187 if (changed) 1188 ieee80211_bss_info_change_notify(sdata, changed); 1189 1190 out: 1191 ieee80211_vif_chanctx_reservation_complete(sdata); 1192 return err; 1193 } 1194 1195 static int 1196 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1197 { 1198 struct ieee80211_local *local = sdata->local; 1199 struct ieee80211_chanctx *old_ctx, *new_ctx; 1200 const struct cfg80211_chan_def *chandef; 1201 int err; 1202 1203 old_ctx = ieee80211_vif_get_chanctx(sdata); 1204 new_ctx = sdata->reserved_chanctx; 1205 1206 if (WARN_ON(!sdata->reserved_ready)) 1207 return -EINVAL; 1208 1209 if (WARN_ON(old_ctx)) 1210 return -EINVAL; 1211 1212 if (WARN_ON(!new_ctx)) 1213 return -EINVAL; 1214 1215 if (WARN_ON(new_ctx->replace_state == 1216 IEEE80211_CHANCTX_REPLACES_OTHER)) 1217 return -EINVAL; 1218 1219 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1220 &sdata->reserved_chandef); 1221 if (WARN_ON(!chandef)) 1222 return -EINVAL; 1223 1224 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef); 1225 1226 list_del(&sdata->reserved_chanctx_list); 1227 sdata->reserved_chanctx = NULL; 1228 1229 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1230 if (err) { 1231 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1232 ieee80211_free_chanctx(local, new_ctx); 1233 1234 goto out; 1235 } 1236 1237 out: 1238 ieee80211_vif_chanctx_reservation_complete(sdata); 1239 return err; 1240 } 1241 1242 static bool 1243 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1244 { 1245 struct ieee80211_chanctx *old_ctx, *new_ctx; 1246 1247 lockdep_assert_held(&sdata->local->chanctx_mtx); 1248 1249 new_ctx = sdata->reserved_chanctx; 1250 old_ctx = ieee80211_vif_get_chanctx(sdata); 1251 1252 if (!old_ctx) 1253 return false; 1254 1255 if (WARN_ON(!new_ctx)) 1256 return false; 1257 1258 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1259 return false; 1260 1261 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1262 return false; 1263 1264 return true; 1265 } 1266 1267 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1268 struct ieee80211_chanctx *new_ctx) 1269 { 1270 const struct cfg80211_chan_def *chandef; 1271 1272 lockdep_assert_held(&local->mtx); 1273 lockdep_assert_held(&local->chanctx_mtx); 1274 1275 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1276 if (WARN_ON(!chandef)) 1277 return -EINVAL; 1278 1279 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1280 local->_oper_chandef = *chandef; 1281 ieee80211_hw_config(local, 0); 1282 1283 return 0; 1284 } 1285 1286 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1287 int n_vifs) 1288 { 1289 struct ieee80211_vif_chanctx_switch *vif_chsw; 1290 struct ieee80211_sub_if_data *sdata; 1291 struct ieee80211_chanctx *ctx, *old_ctx; 1292 int i, err; 1293 1294 lockdep_assert_held(&local->mtx); 1295 lockdep_assert_held(&local->chanctx_mtx); 1296 1297 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1298 if (!vif_chsw) 1299 return -ENOMEM; 1300 1301 i = 0; 1302 list_for_each_entry(ctx, &local->chanctx_list, list) { 1303 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1304 continue; 1305 1306 if (WARN_ON(!ctx->replace_ctx)) { 1307 err = -EINVAL; 1308 goto out; 1309 } 1310 1311 list_for_each_entry(sdata, &ctx->reserved_vifs, 1312 reserved_chanctx_list) { 1313 if (!ieee80211_vif_has_in_place_reservation( 1314 sdata)) 1315 continue; 1316 1317 old_ctx = ieee80211_vif_get_chanctx(sdata); 1318 vif_chsw[i].vif = &sdata->vif; 1319 vif_chsw[i].old_ctx = &old_ctx->conf; 1320 vif_chsw[i].new_ctx = &ctx->conf; 1321 1322 i++; 1323 } 1324 } 1325 1326 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1327 CHANCTX_SWMODE_SWAP_CONTEXTS); 1328 1329 out: 1330 kfree(vif_chsw); 1331 return err; 1332 } 1333 1334 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1335 { 1336 struct ieee80211_chanctx *ctx; 1337 int err; 1338 1339 lockdep_assert_held(&local->mtx); 1340 lockdep_assert_held(&local->chanctx_mtx); 1341 1342 list_for_each_entry(ctx, &local->chanctx_list, list) { 1343 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1344 continue; 1345 1346 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1347 continue; 1348 1349 ieee80211_del_chanctx(local, ctx->replace_ctx); 1350 err = ieee80211_add_chanctx(local, ctx); 1351 if (err) 1352 goto err; 1353 } 1354 1355 return 0; 1356 1357 err: 1358 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1359 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1360 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1361 continue; 1362 1363 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1364 continue; 1365 1366 ieee80211_del_chanctx(local, ctx); 1367 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1368 } 1369 1370 return err; 1371 } 1372 1373 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1374 { 1375 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1376 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1377 struct ieee80211_chanctx *new_ctx = NULL; 1378 int err, n_assigned, n_reserved, n_ready; 1379 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1380 1381 lockdep_assert_held(&local->mtx); 1382 lockdep_assert_held(&local->chanctx_mtx); 1383 1384 /* 1385 * If there are 2 independent pairs of channel contexts performing 1386 * cross-switch of their vifs this code will still wait until both are 1387 * ready even though it could be possible to switch one before the 1388 * other is ready. 1389 * 1390 * For practical reasons and code simplicity just do a single huge 1391 * switch. 1392 */ 1393 1394 /* 1395 * Verify if the reservation is still feasible. 1396 * - if it's not then disconnect 1397 * - if it is but not all vifs necessary are ready then defer 1398 */ 1399 1400 list_for_each_entry(ctx, &local->chanctx_list, list) { 1401 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1402 continue; 1403 1404 if (WARN_ON(!ctx->replace_ctx)) { 1405 err = -EINVAL; 1406 goto err; 1407 } 1408 1409 if (!local->use_chanctx) 1410 new_ctx = ctx; 1411 1412 n_ctx++; 1413 1414 n_assigned = 0; 1415 n_reserved = 0; 1416 n_ready = 0; 1417 1418 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1419 assigned_chanctx_list) { 1420 n_assigned++; 1421 if (sdata->reserved_chanctx) { 1422 n_reserved++; 1423 if (sdata->reserved_ready) 1424 n_ready++; 1425 } 1426 } 1427 1428 if (n_assigned != n_reserved) { 1429 if (n_ready == n_reserved) { 1430 wiphy_info(local->hw.wiphy, 1431 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1432 err = -EBUSY; 1433 goto err; 1434 } 1435 1436 return -EAGAIN; 1437 } 1438 1439 ctx->conf.radar_enabled = false; 1440 list_for_each_entry(sdata, &ctx->reserved_vifs, 1441 reserved_chanctx_list) { 1442 if (ieee80211_vif_has_in_place_reservation(sdata) && 1443 !sdata->reserved_ready) 1444 return -EAGAIN; 1445 1446 old_ctx = ieee80211_vif_get_chanctx(sdata); 1447 if (old_ctx) { 1448 if (old_ctx->replace_state == 1449 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1450 n_vifs_switch++; 1451 else 1452 n_vifs_assign++; 1453 } else { 1454 n_vifs_ctxless++; 1455 } 1456 1457 if (sdata->reserved_radar_required) 1458 ctx->conf.radar_enabled = true; 1459 } 1460 } 1461 1462 if (WARN_ON(n_ctx == 0) || 1463 WARN_ON(n_vifs_switch == 0 && 1464 n_vifs_assign == 0 && 1465 n_vifs_ctxless == 0) || 1466 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1467 WARN_ON(!new_ctx && !local->use_chanctx)) { 1468 err = -EINVAL; 1469 goto err; 1470 } 1471 1472 /* 1473 * All necessary vifs are ready. Perform the switch now depending on 1474 * reservations and driver capabilities. 1475 */ 1476 1477 if (local->use_chanctx) { 1478 if (n_vifs_switch > 0) { 1479 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1480 if (err) 1481 goto err; 1482 } 1483 1484 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1485 err = ieee80211_chsw_switch_ctxs(local); 1486 if (err) 1487 goto err; 1488 } 1489 } else { 1490 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1491 if (err) 1492 goto err; 1493 } 1494 1495 /* 1496 * Update all structures, values and pointers to point to new channel 1497 * context(s). 1498 */ 1499 list_for_each_entry(ctx, &local->chanctx_list, list) { 1500 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1501 continue; 1502 1503 if (WARN_ON(!ctx->replace_ctx)) { 1504 err = -EINVAL; 1505 goto err; 1506 } 1507 1508 list_for_each_entry(sdata, &ctx->reserved_vifs, 1509 reserved_chanctx_list) { 1510 u32 changed = 0; 1511 1512 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1513 continue; 1514 1515 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1516 1517 if (sdata->vif.type == NL80211_IFTYPE_AP) 1518 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1519 false); 1520 1521 ieee80211_check_fast_xmit_iface(sdata); 1522 1523 sdata->radar_required = sdata->reserved_radar_required; 1524 1525 if (sdata->vif.bss_conf.chandef.width != 1526 sdata->reserved_chandef.width) 1527 changed = BSS_CHANGED_BANDWIDTH; 1528 1529 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1530 if (changed) 1531 ieee80211_bss_info_change_notify(sdata, 1532 changed); 1533 1534 ieee80211_recalc_txpower(sdata, false); 1535 } 1536 1537 ieee80211_recalc_chanctx_chantype(local, ctx); 1538 ieee80211_recalc_smps_chanctx(local, ctx); 1539 ieee80211_recalc_radar_chanctx(local, ctx); 1540 ieee80211_recalc_chanctx_min_def(local, ctx); 1541 1542 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1543 reserved_chanctx_list) { 1544 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1545 continue; 1546 1547 list_del(&sdata->reserved_chanctx_list); 1548 list_move(&sdata->assigned_chanctx_list, 1549 &ctx->assigned_vifs); 1550 sdata->reserved_chanctx = NULL; 1551 1552 ieee80211_vif_chanctx_reservation_complete(sdata); 1553 } 1554 1555 /* 1556 * This context might have been a dependency for an already 1557 * ready re-assign reservation interface that was deferred. Do 1558 * not propagate error to the caller though. The in-place 1559 * reservation for originally requested interface has already 1560 * succeeded at this point. 1561 */ 1562 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1563 reserved_chanctx_list) { 1564 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1565 sdata))) 1566 continue; 1567 1568 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1569 continue; 1570 1571 if (!sdata->reserved_ready) 1572 continue; 1573 1574 if (ieee80211_vif_get_chanctx(sdata)) 1575 err = ieee80211_vif_use_reserved_reassign( 1576 sdata); 1577 else 1578 err = ieee80211_vif_use_reserved_assign(sdata); 1579 1580 if (err) { 1581 sdata_info(sdata, 1582 "failed to finalize (re-)assign reservation (err=%d)\n", 1583 err); 1584 ieee80211_vif_unreserve_chanctx(sdata); 1585 cfg80211_stop_iface(local->hw.wiphy, 1586 &sdata->wdev, 1587 GFP_KERNEL); 1588 } 1589 } 1590 } 1591 1592 /* 1593 * Finally free old contexts 1594 */ 1595 1596 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1597 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1598 continue; 1599 1600 ctx->replace_ctx->replace_ctx = NULL; 1601 ctx->replace_ctx->replace_state = 1602 IEEE80211_CHANCTX_REPLACE_NONE; 1603 1604 list_del_rcu(&ctx->list); 1605 kfree_rcu(ctx, rcu_head); 1606 } 1607 1608 return 0; 1609 1610 err: 1611 list_for_each_entry(ctx, &local->chanctx_list, list) { 1612 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1613 continue; 1614 1615 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1616 reserved_chanctx_list) { 1617 ieee80211_vif_unreserve_chanctx(sdata); 1618 ieee80211_vif_chanctx_reservation_complete(sdata); 1619 } 1620 } 1621 1622 return err; 1623 } 1624 1625 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1626 { 1627 struct ieee80211_local *local = sdata->local; 1628 struct ieee80211_chanctx_conf *conf; 1629 struct ieee80211_chanctx *ctx; 1630 bool use_reserved_switch = false; 1631 1632 lockdep_assert_held(&local->chanctx_mtx); 1633 1634 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1635 lockdep_is_held(&local->chanctx_mtx)); 1636 if (!conf) 1637 return; 1638 1639 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1640 1641 if (sdata->reserved_chanctx) { 1642 if (sdata->reserved_chanctx->replace_state == 1643 IEEE80211_CHANCTX_REPLACES_OTHER && 1644 ieee80211_chanctx_num_reserved(local, 1645 sdata->reserved_chanctx) > 1) 1646 use_reserved_switch = true; 1647 1648 ieee80211_vif_unreserve_chanctx(sdata); 1649 } 1650 1651 ieee80211_assign_vif_chanctx(sdata, NULL); 1652 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1653 ieee80211_free_chanctx(local, ctx); 1654 1655 sdata->radar_required = false; 1656 1657 /* Unreserving may ready an in-place reservation. */ 1658 if (use_reserved_switch) 1659 ieee80211_vif_use_reserved_switch(local); 1660 } 1661 1662 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1663 const struct cfg80211_chan_def *chandef, 1664 enum ieee80211_chanctx_mode mode) 1665 { 1666 struct ieee80211_local *local = sdata->local; 1667 struct ieee80211_chanctx *ctx; 1668 u8 radar_detect_width = 0; 1669 int ret; 1670 1671 lockdep_assert_held(&local->mtx); 1672 1673 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1674 1675 mutex_lock(&local->chanctx_mtx); 1676 1677 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1678 chandef, 1679 sdata->wdev.iftype); 1680 if (ret < 0) 1681 goto out; 1682 if (ret > 0) 1683 radar_detect_width = BIT(chandef->width); 1684 1685 sdata->radar_required = ret; 1686 1687 ret = ieee80211_check_combinations(sdata, chandef, mode, 1688 radar_detect_width); 1689 if (ret < 0) 1690 goto out; 1691 1692 __ieee80211_vif_release_channel(sdata); 1693 1694 ctx = ieee80211_find_chanctx(local, chandef, mode); 1695 if (!ctx) 1696 ctx = ieee80211_new_chanctx(local, chandef, mode); 1697 if (IS_ERR(ctx)) { 1698 ret = PTR_ERR(ctx); 1699 goto out; 1700 } 1701 1702 ieee80211_vif_update_chandef(sdata, chandef); 1703 1704 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1705 if (ret) { 1706 /* if assign fails refcount stays the same */ 1707 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1708 ieee80211_free_chanctx(local, ctx); 1709 goto out; 1710 } 1711 1712 ieee80211_recalc_smps_chanctx(local, ctx); 1713 ieee80211_recalc_radar_chanctx(local, ctx); 1714 out: 1715 if (ret) 1716 sdata->radar_required = false; 1717 1718 mutex_unlock(&local->chanctx_mtx); 1719 return ret; 1720 } 1721 1722 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1723 { 1724 struct ieee80211_local *local = sdata->local; 1725 struct ieee80211_chanctx *new_ctx; 1726 struct ieee80211_chanctx *old_ctx; 1727 int err; 1728 1729 lockdep_assert_held(&local->mtx); 1730 lockdep_assert_held(&local->chanctx_mtx); 1731 1732 new_ctx = sdata->reserved_chanctx; 1733 old_ctx = ieee80211_vif_get_chanctx(sdata); 1734 1735 if (WARN_ON(!new_ctx)) 1736 return -EINVAL; 1737 1738 if (WARN_ON(new_ctx->replace_state == 1739 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1740 return -EINVAL; 1741 1742 if (WARN_ON(sdata->reserved_ready)) 1743 return -EINVAL; 1744 1745 sdata->reserved_ready = true; 1746 1747 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1748 if (old_ctx) 1749 err = ieee80211_vif_use_reserved_reassign(sdata); 1750 else 1751 err = ieee80211_vif_use_reserved_assign(sdata); 1752 1753 if (err) 1754 return err; 1755 } 1756 1757 /* 1758 * In-place reservation may need to be finalized now either if: 1759 * a) sdata is taking part in the swapping itself and is the last one 1760 * b) sdata has switched with a re-assign reservation to an existing 1761 * context readying in-place switching of old_ctx 1762 * 1763 * In case of (b) do not propagate the error up because the requested 1764 * sdata already switched successfully. Just spill an extra warning. 1765 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1766 * interfaces upon failure. 1767 */ 1768 if ((old_ctx && 1769 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1770 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1771 err = ieee80211_vif_use_reserved_switch(local); 1772 if (err && err != -EAGAIN) { 1773 if (new_ctx->replace_state == 1774 IEEE80211_CHANCTX_REPLACES_OTHER) 1775 return err; 1776 1777 wiphy_info(local->hw.wiphy, 1778 "depending in-place reservation failed (err=%d)\n", 1779 err); 1780 } 1781 } 1782 1783 return 0; 1784 } 1785 1786 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 1787 const struct cfg80211_chan_def *chandef, 1788 u32 *changed) 1789 { 1790 struct ieee80211_local *local = sdata->local; 1791 struct ieee80211_chanctx_conf *conf; 1792 struct ieee80211_chanctx *ctx; 1793 const struct cfg80211_chan_def *compat; 1794 int ret; 1795 1796 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1797 IEEE80211_CHAN_DISABLED)) 1798 return -EINVAL; 1799 1800 mutex_lock(&local->chanctx_mtx); 1801 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { 1802 ret = 0; 1803 goto out; 1804 } 1805 1806 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1807 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { 1808 ret = -EINVAL; 1809 goto out; 1810 } 1811 1812 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1813 lockdep_is_held(&local->chanctx_mtx)); 1814 if (!conf) { 1815 ret = -EINVAL; 1816 goto out; 1817 } 1818 1819 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1820 1821 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1822 if (!compat) { 1823 ret = -EINVAL; 1824 goto out; 1825 } 1826 1827 switch (ctx->replace_state) { 1828 case IEEE80211_CHANCTX_REPLACE_NONE: 1829 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) { 1830 ret = -EBUSY; 1831 goto out; 1832 } 1833 break; 1834 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1835 /* TODO: Perhaps the bandwidth change could be treated as a 1836 * reservation itself? */ 1837 ret = -EBUSY; 1838 goto out; 1839 case IEEE80211_CHANCTX_REPLACES_OTHER: 1840 /* channel context that is going to replace another channel 1841 * context doesn't really exist and shouldn't be assigned 1842 * anywhere yet */ 1843 WARN_ON(1); 1844 break; 1845 } 1846 1847 ieee80211_vif_update_chandef(sdata, chandef); 1848 1849 ieee80211_recalc_chanctx_chantype(local, ctx); 1850 1851 *changed |= BSS_CHANGED_BANDWIDTH; 1852 ret = 0; 1853 out: 1854 mutex_unlock(&local->chanctx_mtx); 1855 return ret; 1856 } 1857 1858 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1859 { 1860 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1861 1862 lockdep_assert_held(&sdata->local->mtx); 1863 1864 mutex_lock(&sdata->local->chanctx_mtx); 1865 __ieee80211_vif_release_channel(sdata); 1866 mutex_unlock(&sdata->local->chanctx_mtx); 1867 } 1868 1869 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) 1870 { 1871 struct ieee80211_local *local = sdata->local; 1872 struct ieee80211_sub_if_data *ap; 1873 struct ieee80211_chanctx_conf *conf; 1874 1875 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 1876 return; 1877 1878 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1879 1880 mutex_lock(&local->chanctx_mtx); 1881 1882 conf = rcu_dereference_protected(ap->vif.chanctx_conf, 1883 lockdep_is_held(&local->chanctx_mtx)); 1884 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 1885 mutex_unlock(&local->chanctx_mtx); 1886 } 1887 1888 void ieee80211_iter_chan_contexts_atomic( 1889 struct ieee80211_hw *hw, 1890 void (*iter)(struct ieee80211_hw *hw, 1891 struct ieee80211_chanctx_conf *chanctx_conf, 1892 void *data), 1893 void *iter_data) 1894 { 1895 struct ieee80211_local *local = hw_to_local(hw); 1896 struct ieee80211_chanctx *ctx; 1897 1898 rcu_read_lock(); 1899 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 1900 if (ctx->driver_present) 1901 iter(hw, &ctx->conf, iter_data); 1902 rcu_read_unlock(); 1903 } 1904 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 1905