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.deflink.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 case IEEE80211_STA_RX_BW_320: 222 return NL80211_CHAN_WIDTH_320; 223 default: 224 WARN_ON(1); 225 return NL80211_CHAN_WIDTH_20; 226 } 227 } 228 229 static enum nl80211_chan_width 230 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata) 231 { 232 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 233 struct sta_info *sta; 234 235 rcu_read_lock(); 236 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 237 if (sdata != sta->sdata && 238 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 239 continue; 240 241 max_bw = max(max_bw, ieee80211_get_sta_bw(sta)); 242 } 243 rcu_read_unlock(); 244 245 return max_bw; 246 } 247 248 static enum nl80211_chan_width 249 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 250 struct ieee80211_chanctx_conf *conf) 251 { 252 struct ieee80211_sub_if_data *sdata; 253 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 254 255 rcu_read_lock(); 256 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 257 struct ieee80211_vif *vif = &sdata->vif; 258 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 259 260 if (!ieee80211_sdata_running(sdata)) 261 continue; 262 263 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 264 continue; 265 266 switch (vif->type) { 267 case NL80211_IFTYPE_AP: 268 case NL80211_IFTYPE_AP_VLAN: 269 width = ieee80211_get_max_required_bw(sdata); 270 break; 271 case NL80211_IFTYPE_STATION: 272 /* 273 * The ap's sta->bandwidth is not set yet at this 274 * point, so take the width from the chandef, but 275 * account also for TDLS peers 276 */ 277 width = max(vif->bss_conf.chandef.width, 278 ieee80211_get_max_required_bw(sdata)); 279 break; 280 case NL80211_IFTYPE_P2P_DEVICE: 281 case NL80211_IFTYPE_NAN: 282 continue; 283 case NL80211_IFTYPE_ADHOC: 284 case NL80211_IFTYPE_MESH_POINT: 285 case NL80211_IFTYPE_OCB: 286 width = vif->bss_conf.chandef.width; 287 break; 288 case NL80211_IFTYPE_WDS: 289 case NL80211_IFTYPE_UNSPECIFIED: 290 case NUM_NL80211_IFTYPES: 291 case NL80211_IFTYPE_MONITOR: 292 case NL80211_IFTYPE_P2P_CLIENT: 293 case NL80211_IFTYPE_P2P_GO: 294 WARN_ON_ONCE(1); 295 } 296 max_bw = max(max_bw, width); 297 } 298 299 /* use the configured bandwidth in case of monitor interface */ 300 sdata = rcu_dereference(local->monitor_sdata); 301 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 302 max_bw = max(max_bw, conf->def.width); 303 304 rcu_read_unlock(); 305 306 return max_bw; 307 } 308 309 /* 310 * recalc the min required chan width of the channel context, which is 311 * the max of min required widths of all the interfaces bound to this 312 * channel context. 313 */ 314 static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 315 struct ieee80211_chanctx *ctx) 316 { 317 enum nl80211_chan_width max_bw; 318 struct cfg80211_chan_def min_def; 319 320 lockdep_assert_held(&local->chanctx_mtx); 321 322 /* don't optimize non-20MHz based and radar_enabled confs */ 323 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 324 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 325 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 || 326 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 || 327 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 || 328 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 || 329 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 || 330 ctx->conf.radar_enabled) { 331 ctx->conf.min_def = ctx->conf.def; 332 return 0; 333 } 334 335 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 336 337 /* downgrade chandef up to max_bw */ 338 min_def = ctx->conf.def; 339 while (min_def.width > max_bw) 340 ieee80211_chandef_downgrade(&min_def); 341 342 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 343 return 0; 344 345 ctx->conf.min_def = min_def; 346 if (!ctx->driver_present) 347 return 0; 348 349 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH; 350 } 351 352 /* calling this function is assuming that station vif is updated to 353 * lates changes by calling ieee80211_vif_update_chandef 354 */ 355 static void ieee80211_chan_bw_change(struct ieee80211_local *local, 356 struct ieee80211_chanctx *ctx, 357 bool narrowed) 358 { 359 struct sta_info *sta; 360 struct ieee80211_supported_band *sband = 361 local->hw.wiphy->bands[ctx->conf.def.chan->band]; 362 363 rcu_read_lock(); 364 list_for_each_entry_rcu(sta, &local->sta_list, 365 list) { 366 enum ieee80211_sta_rx_bandwidth new_sta_bw; 367 368 if (!ieee80211_sdata_running(sta->sdata)) 369 continue; 370 371 if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) != 372 &ctx->conf) 373 continue; 374 375 new_sta_bw = ieee80211_sta_cur_vht_bw(sta); 376 377 /* nothing change */ 378 if (new_sta_bw == sta->sta.deflink.bandwidth) 379 continue; 380 381 /* vif changed to narrow BW and narrow BW for station wasn't 382 * requested or vise versa */ 383 if ((new_sta_bw < sta->sta.deflink.bandwidth) == !narrowed) 384 continue; 385 386 sta->sta.deflink.bandwidth = new_sta_bw; 387 rate_control_rate_update(local, sband, sta, 388 IEEE80211_RC_BW_CHANGED); 389 } 390 rcu_read_unlock(); 391 } 392 393 /* 394 * recalc the min required chan width of the channel context, which is 395 * the max of min required widths of all the interfaces bound to this 396 * channel context. 397 */ 398 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 399 struct ieee80211_chanctx *ctx) 400 { 401 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx); 402 403 if (!changed) 404 return; 405 406 /* check is BW narrowed */ 407 ieee80211_chan_bw_change(local, ctx, true); 408 409 drv_change_chanctx(local, ctx, changed); 410 411 /* check is BW wider */ 412 ieee80211_chan_bw_change(local, ctx, false); 413 } 414 415 static void ieee80211_change_chanctx(struct ieee80211_local *local, 416 struct ieee80211_chanctx *ctx, 417 struct ieee80211_chanctx *old_ctx, 418 const struct cfg80211_chan_def *chandef) 419 { 420 u32 changed; 421 422 /* expected to handle only 20/40/80/160/320 channel widths */ 423 switch (chandef->width) { 424 case NL80211_CHAN_WIDTH_20_NOHT: 425 case NL80211_CHAN_WIDTH_20: 426 case NL80211_CHAN_WIDTH_40: 427 case NL80211_CHAN_WIDTH_80: 428 case NL80211_CHAN_WIDTH_80P80: 429 case NL80211_CHAN_WIDTH_160: 430 case NL80211_CHAN_WIDTH_320: 431 break; 432 default: 433 WARN_ON(1); 434 } 435 436 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def 437 * due to maybe not returning from it, e.g in case new context was added 438 * first time with all parameters up to date. 439 */ 440 ieee80211_chan_bw_change(local, old_ctx, true); 441 442 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 443 ieee80211_recalc_chanctx_min_def(local, ctx); 444 return; 445 } 446 447 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 448 449 ctx->conf.def = *chandef; 450 451 /* check if min chanctx also changed */ 452 changed = IEEE80211_CHANCTX_CHANGE_WIDTH | 453 _ieee80211_recalc_chanctx_min_def(local, ctx); 454 drv_change_chanctx(local, ctx, changed); 455 456 if (!local->use_chanctx) { 457 local->_oper_chandef = *chandef; 458 ieee80211_hw_config(local, 0); 459 } 460 461 /* check is BW wider */ 462 ieee80211_chan_bw_change(local, old_ctx, false); 463 } 464 465 static struct ieee80211_chanctx * 466 ieee80211_find_chanctx(struct ieee80211_local *local, 467 const struct cfg80211_chan_def *chandef, 468 enum ieee80211_chanctx_mode mode) 469 { 470 struct ieee80211_chanctx *ctx; 471 472 lockdep_assert_held(&local->chanctx_mtx); 473 474 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 475 return NULL; 476 477 list_for_each_entry(ctx, &local->chanctx_list, list) { 478 const struct cfg80211_chan_def *compat; 479 480 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 481 continue; 482 483 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 484 continue; 485 486 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 487 if (!compat) 488 continue; 489 490 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 491 compat); 492 if (!compat) 493 continue; 494 495 ieee80211_change_chanctx(local, ctx, ctx, compat); 496 497 return ctx; 498 } 499 500 return NULL; 501 } 502 503 bool ieee80211_is_radar_required(struct ieee80211_local *local) 504 { 505 struct ieee80211_sub_if_data *sdata; 506 507 lockdep_assert_held(&local->mtx); 508 509 rcu_read_lock(); 510 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 511 if (sdata->radar_required) { 512 rcu_read_unlock(); 513 return true; 514 } 515 } 516 rcu_read_unlock(); 517 518 return false; 519 } 520 521 static bool 522 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 523 struct ieee80211_chanctx *ctx) 524 { 525 struct ieee80211_chanctx_conf *conf = &ctx->conf; 526 struct ieee80211_sub_if_data *sdata; 527 bool required = false; 528 529 lockdep_assert_held(&local->chanctx_mtx); 530 lockdep_assert_held(&local->mtx); 531 532 rcu_read_lock(); 533 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 534 if (!ieee80211_sdata_running(sdata)) 535 continue; 536 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 537 continue; 538 if (!sdata->radar_required) 539 continue; 540 541 required = true; 542 break; 543 } 544 rcu_read_unlock(); 545 546 return required; 547 } 548 549 static struct ieee80211_chanctx * 550 ieee80211_alloc_chanctx(struct ieee80211_local *local, 551 const struct cfg80211_chan_def *chandef, 552 enum ieee80211_chanctx_mode mode) 553 { 554 struct ieee80211_chanctx *ctx; 555 556 lockdep_assert_held(&local->chanctx_mtx); 557 558 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 559 if (!ctx) 560 return NULL; 561 562 INIT_LIST_HEAD(&ctx->assigned_vifs); 563 INIT_LIST_HEAD(&ctx->reserved_vifs); 564 ctx->conf.def = *chandef; 565 ctx->conf.rx_chains_static = 1; 566 ctx->conf.rx_chains_dynamic = 1; 567 ctx->mode = mode; 568 ctx->conf.radar_enabled = false; 569 ieee80211_recalc_chanctx_min_def(local, ctx); 570 571 return ctx; 572 } 573 574 static int ieee80211_add_chanctx(struct ieee80211_local *local, 575 struct ieee80211_chanctx *ctx) 576 { 577 u32 changed; 578 int err; 579 580 lockdep_assert_held(&local->mtx); 581 lockdep_assert_held(&local->chanctx_mtx); 582 583 if (!local->use_chanctx) 584 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 585 586 /* turn idle off *before* setting channel -- some drivers need that */ 587 changed = ieee80211_idle_off(local); 588 if (changed) 589 ieee80211_hw_config(local, changed); 590 591 if (!local->use_chanctx) { 592 local->_oper_chandef = ctx->conf.def; 593 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 594 } else { 595 err = drv_add_chanctx(local, ctx); 596 if (err) { 597 ieee80211_recalc_idle(local); 598 return err; 599 } 600 } 601 602 return 0; 603 } 604 605 static struct ieee80211_chanctx * 606 ieee80211_new_chanctx(struct ieee80211_local *local, 607 const struct cfg80211_chan_def *chandef, 608 enum ieee80211_chanctx_mode mode) 609 { 610 struct ieee80211_chanctx *ctx; 611 int err; 612 613 lockdep_assert_held(&local->mtx); 614 lockdep_assert_held(&local->chanctx_mtx); 615 616 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 617 if (!ctx) 618 return ERR_PTR(-ENOMEM); 619 620 err = ieee80211_add_chanctx(local, ctx); 621 if (err) { 622 kfree(ctx); 623 return ERR_PTR(err); 624 } 625 626 list_add_rcu(&ctx->list, &local->chanctx_list); 627 return ctx; 628 } 629 630 static void ieee80211_del_chanctx(struct ieee80211_local *local, 631 struct ieee80211_chanctx *ctx) 632 { 633 lockdep_assert_held(&local->chanctx_mtx); 634 635 if (!local->use_chanctx) { 636 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 637 /* S1G doesn't have 20MHz, so get the correct width for the 638 * current channel. 639 */ 640 if (chandef->chan->band == NL80211_BAND_S1GHZ) 641 chandef->width = 642 ieee80211_s1g_channel_width(chandef->chan); 643 else 644 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 645 chandef->center_freq1 = chandef->chan->center_freq; 646 chandef->freq1_offset = chandef->chan->freq_offset; 647 chandef->center_freq2 = 0; 648 649 /* NOTE: Disabling radar is only valid here for 650 * single channel context. To be sure, check it ... 651 */ 652 WARN_ON(local->hw.conf.radar_enabled && 653 !list_empty(&local->chanctx_list)); 654 655 local->hw.conf.radar_enabled = false; 656 657 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 658 } else { 659 drv_remove_chanctx(local, ctx); 660 } 661 662 ieee80211_recalc_idle(local); 663 } 664 665 static void ieee80211_free_chanctx(struct ieee80211_local *local, 666 struct ieee80211_chanctx *ctx) 667 { 668 lockdep_assert_held(&local->chanctx_mtx); 669 670 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 671 672 list_del_rcu(&ctx->list); 673 ieee80211_del_chanctx(local, ctx); 674 kfree_rcu(ctx, rcu_head); 675 } 676 677 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 678 struct ieee80211_chanctx *ctx) 679 { 680 struct ieee80211_chanctx_conf *conf = &ctx->conf; 681 struct ieee80211_sub_if_data *sdata; 682 const struct cfg80211_chan_def *compat = NULL; 683 struct sta_info *sta; 684 685 lockdep_assert_held(&local->chanctx_mtx); 686 687 rcu_read_lock(); 688 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 689 690 if (!ieee80211_sdata_running(sdata)) 691 continue; 692 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 693 continue; 694 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 695 continue; 696 697 if (!compat) 698 compat = &sdata->vif.bss_conf.chandef; 699 700 compat = cfg80211_chandef_compatible( 701 &sdata->vif.bss_conf.chandef, compat); 702 if (WARN_ON_ONCE(!compat)) 703 break; 704 } 705 706 /* TDLS peers can sometimes affect the chandef width */ 707 list_for_each_entry_rcu(sta, &local->sta_list, list) { 708 if (!sta->uploaded || 709 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 710 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 711 !sta->tdls_chandef.chan) 712 continue; 713 714 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 715 compat); 716 if (WARN_ON_ONCE(!compat)) 717 break; 718 } 719 rcu_read_unlock(); 720 721 if (!compat) 722 return; 723 724 ieee80211_change_chanctx(local, ctx, ctx, compat); 725 } 726 727 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 728 struct ieee80211_chanctx *chanctx) 729 { 730 bool radar_enabled; 731 732 lockdep_assert_held(&local->chanctx_mtx); 733 /* for ieee80211_is_radar_required */ 734 lockdep_assert_held(&local->mtx); 735 736 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 737 738 if (radar_enabled == chanctx->conf.radar_enabled) 739 return; 740 741 chanctx->conf.radar_enabled = radar_enabled; 742 743 if (!local->use_chanctx) { 744 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 746 } 747 748 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 749 } 750 751 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 752 struct ieee80211_chanctx *new_ctx) 753 { 754 struct ieee80211_local *local = sdata->local; 755 struct ieee80211_chanctx_conf *conf; 756 struct ieee80211_chanctx *curr_ctx = NULL; 757 int ret = 0; 758 759 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 760 return -ENOTSUPP; 761 762 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 763 lockdep_is_held(&local->chanctx_mtx)); 764 765 if (conf) { 766 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 767 768 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 769 conf = NULL; 770 list_del(&sdata->assigned_chanctx_list); 771 } 772 773 if (new_ctx) { 774 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 775 if (ret) 776 goto out; 777 778 conf = &new_ctx->conf; 779 list_add(&sdata->assigned_chanctx_list, 780 &new_ctx->assigned_vifs); 781 } 782 783 out: 784 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 785 786 sdata->vif.bss_conf.idle = !conf; 787 788 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 789 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 790 ieee80211_recalc_smps_chanctx(local, curr_ctx); 791 ieee80211_recalc_radar_chanctx(local, curr_ctx); 792 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 793 } 794 795 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 796 ieee80211_recalc_txpower(sdata, false); 797 ieee80211_recalc_chanctx_min_def(local, new_ctx); 798 } 799 800 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 801 sdata->vif.type != NL80211_IFTYPE_MONITOR) 802 ieee80211_bss_info_change_notify(sdata, 803 BSS_CHANGED_IDLE); 804 805 ieee80211_check_fast_xmit_iface(sdata); 806 807 return ret; 808 } 809 810 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 811 struct ieee80211_chanctx *chanctx) 812 { 813 struct ieee80211_sub_if_data *sdata; 814 u8 rx_chains_static, rx_chains_dynamic; 815 816 lockdep_assert_held(&local->chanctx_mtx); 817 818 rx_chains_static = 1; 819 rx_chains_dynamic = 1; 820 821 rcu_read_lock(); 822 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 823 u8 needed_static, needed_dynamic; 824 825 if (!ieee80211_sdata_running(sdata)) 826 continue; 827 828 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 829 &chanctx->conf) 830 continue; 831 832 switch (sdata->vif.type) { 833 case NL80211_IFTYPE_P2P_DEVICE: 834 case NL80211_IFTYPE_NAN: 835 continue; 836 case NL80211_IFTYPE_STATION: 837 if (!sdata->u.mgd.associated) 838 continue; 839 break; 840 case NL80211_IFTYPE_AP_VLAN: 841 continue; 842 case NL80211_IFTYPE_AP: 843 case NL80211_IFTYPE_ADHOC: 844 case NL80211_IFTYPE_MESH_POINT: 845 case NL80211_IFTYPE_OCB: 846 break; 847 default: 848 WARN_ON_ONCE(1); 849 } 850 851 switch (sdata->smps_mode) { 852 default: 853 WARN_ONCE(1, "Invalid SMPS mode %d\n", 854 sdata->smps_mode); 855 fallthrough; 856 case IEEE80211_SMPS_OFF: 857 needed_static = sdata->needed_rx_chains; 858 needed_dynamic = sdata->needed_rx_chains; 859 break; 860 case IEEE80211_SMPS_DYNAMIC: 861 needed_static = 1; 862 needed_dynamic = sdata->needed_rx_chains; 863 break; 864 case IEEE80211_SMPS_STATIC: 865 needed_static = 1; 866 needed_dynamic = 1; 867 break; 868 } 869 870 rx_chains_static = max(rx_chains_static, needed_static); 871 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 872 } 873 874 /* Disable SMPS for the monitor interface */ 875 sdata = rcu_dereference(local->monitor_sdata); 876 if (sdata && 877 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 878 rx_chains_dynamic = rx_chains_static = local->rx_chains; 879 880 rcu_read_unlock(); 881 882 if (!local->use_chanctx) { 883 if (rx_chains_static > 1) 884 local->smps_mode = IEEE80211_SMPS_OFF; 885 else if (rx_chains_dynamic > 1) 886 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 887 else 888 local->smps_mode = IEEE80211_SMPS_STATIC; 889 ieee80211_hw_config(local, 0); 890 } 891 892 if (rx_chains_static == chanctx->conf.rx_chains_static && 893 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 894 return; 895 896 chanctx->conf.rx_chains_static = rx_chains_static; 897 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 898 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 899 } 900 901 static void 902 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 903 bool clear) 904 { 905 struct ieee80211_local *local __maybe_unused = sdata->local; 906 struct ieee80211_sub_if_data *vlan; 907 struct ieee80211_chanctx_conf *conf; 908 909 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 910 return; 911 912 lockdep_assert_held(&local->mtx); 913 914 /* Check that conf exists, even when clearing this function 915 * must be called with the AP's channel context still there 916 * as it would otherwise cause VLANs to have an invalid 917 * channel context pointer for a while, possibly pointing 918 * to a channel context that has already been freed. 919 */ 920 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 921 lockdep_is_held(&local->chanctx_mtx)); 922 WARN_ON(!conf); 923 924 if (clear) 925 conf = NULL; 926 927 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 928 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 929 } 930 931 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 932 bool clear) 933 { 934 struct ieee80211_local *local = sdata->local; 935 936 mutex_lock(&local->chanctx_mtx); 937 938 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 939 940 mutex_unlock(&local->chanctx_mtx); 941 } 942 943 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 944 { 945 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 946 947 lockdep_assert_held(&sdata->local->chanctx_mtx); 948 949 if (WARN_ON(!ctx)) 950 return -EINVAL; 951 952 list_del(&sdata->reserved_chanctx_list); 953 sdata->reserved_chanctx = NULL; 954 955 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 956 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 957 if (WARN_ON(!ctx->replace_ctx)) 958 return -EINVAL; 959 960 WARN_ON(ctx->replace_ctx->replace_state != 961 IEEE80211_CHANCTX_WILL_BE_REPLACED); 962 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 963 964 ctx->replace_ctx->replace_ctx = NULL; 965 ctx->replace_ctx->replace_state = 966 IEEE80211_CHANCTX_REPLACE_NONE; 967 968 list_del_rcu(&ctx->list); 969 kfree_rcu(ctx, rcu_head); 970 } else { 971 ieee80211_free_chanctx(sdata->local, ctx); 972 } 973 } 974 975 return 0; 976 } 977 978 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 979 const struct cfg80211_chan_def *chandef, 980 enum ieee80211_chanctx_mode mode, 981 bool radar_required) 982 { 983 struct ieee80211_local *local = sdata->local; 984 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 985 986 lockdep_assert_held(&local->chanctx_mtx); 987 988 curr_ctx = ieee80211_vif_get_chanctx(sdata); 989 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 990 return -ENOTSUPP; 991 992 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 993 if (!new_ctx) { 994 if (ieee80211_can_create_new_chanctx(local)) { 995 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 996 if (IS_ERR(new_ctx)) 997 return PTR_ERR(new_ctx); 998 } else { 999 if (!curr_ctx || 1000 (curr_ctx->replace_state == 1001 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1002 !list_empty(&curr_ctx->reserved_vifs)) { 1003 /* 1004 * Another vif already requested this context 1005 * for a reservation. Find another one hoping 1006 * all vifs assigned to it will also switch 1007 * soon enough. 1008 * 1009 * TODO: This needs a little more work as some 1010 * cases (more than 2 chanctx capable devices) 1011 * may fail which could otherwise succeed 1012 * provided some channel context juggling was 1013 * performed. 1014 * 1015 * Consider ctx1..3, vif1..6, each ctx has 2 1016 * vifs. vif1 and vif2 from ctx1 request new 1017 * different chandefs starting 2 in-place 1018 * reserations with ctx4 and ctx5 replacing 1019 * ctx1 and ctx2 respectively. Next vif5 and 1020 * vif6 from ctx3 reserve ctx4. If vif3 and 1021 * vif4 remain on ctx2 as they are then this 1022 * fails unless `replace_ctx` from ctx5 is 1023 * replaced with ctx3. 1024 */ 1025 list_for_each_entry(ctx, &local->chanctx_list, 1026 list) { 1027 if (ctx->replace_state != 1028 IEEE80211_CHANCTX_REPLACE_NONE) 1029 continue; 1030 1031 if (!list_empty(&ctx->reserved_vifs)) 1032 continue; 1033 1034 curr_ctx = ctx; 1035 break; 1036 } 1037 } 1038 1039 /* 1040 * If that's true then all available contexts already 1041 * have reservations and cannot be used. 1042 */ 1043 if (!curr_ctx || 1044 (curr_ctx->replace_state == 1045 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1046 !list_empty(&curr_ctx->reserved_vifs)) 1047 return -EBUSY; 1048 1049 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 1050 if (!new_ctx) 1051 return -ENOMEM; 1052 1053 new_ctx->replace_ctx = curr_ctx; 1054 new_ctx->replace_state = 1055 IEEE80211_CHANCTX_REPLACES_OTHER; 1056 1057 curr_ctx->replace_ctx = new_ctx; 1058 curr_ctx->replace_state = 1059 IEEE80211_CHANCTX_WILL_BE_REPLACED; 1060 1061 list_add_rcu(&new_ctx->list, &local->chanctx_list); 1062 } 1063 } 1064 1065 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 1066 sdata->reserved_chanctx = new_ctx; 1067 sdata->reserved_chandef = *chandef; 1068 sdata->reserved_radar_required = radar_required; 1069 sdata->reserved_ready = false; 1070 1071 return 0; 1072 } 1073 1074 static void 1075 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 1076 { 1077 switch (sdata->vif.type) { 1078 case NL80211_IFTYPE_ADHOC: 1079 case NL80211_IFTYPE_AP: 1080 case NL80211_IFTYPE_MESH_POINT: 1081 case NL80211_IFTYPE_OCB: 1082 ieee80211_queue_work(&sdata->local->hw, 1083 &sdata->csa_finalize_work); 1084 break; 1085 case NL80211_IFTYPE_STATION: 1086 ieee80211_queue_work(&sdata->local->hw, 1087 &sdata->u.mgd.chswitch_work); 1088 break; 1089 case NL80211_IFTYPE_UNSPECIFIED: 1090 case NL80211_IFTYPE_AP_VLAN: 1091 case NL80211_IFTYPE_WDS: 1092 case NL80211_IFTYPE_MONITOR: 1093 case NL80211_IFTYPE_P2P_CLIENT: 1094 case NL80211_IFTYPE_P2P_GO: 1095 case NL80211_IFTYPE_P2P_DEVICE: 1096 case NL80211_IFTYPE_NAN: 1097 case NUM_NL80211_IFTYPES: 1098 WARN_ON(1); 1099 break; 1100 } 1101 } 1102 1103 static void 1104 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 1105 const struct cfg80211_chan_def *chandef) 1106 { 1107 struct ieee80211_sub_if_data *vlan; 1108 1109 sdata->vif.bss_conf.chandef = *chandef; 1110 1111 if (sdata->vif.type != NL80211_IFTYPE_AP) 1112 return; 1113 1114 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1115 vlan->vif.bss_conf.chandef = *chandef; 1116 } 1117 1118 static int 1119 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1120 { 1121 struct ieee80211_local *local = sdata->local; 1122 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1123 struct ieee80211_chanctx *old_ctx, *new_ctx; 1124 const struct cfg80211_chan_def *chandef; 1125 u32 changed = 0; 1126 int err; 1127 1128 lockdep_assert_held(&local->mtx); 1129 lockdep_assert_held(&local->chanctx_mtx); 1130 1131 new_ctx = sdata->reserved_chanctx; 1132 old_ctx = ieee80211_vif_get_chanctx(sdata); 1133 1134 if (WARN_ON(!sdata->reserved_ready)) 1135 return -EBUSY; 1136 1137 if (WARN_ON(!new_ctx)) 1138 return -EINVAL; 1139 1140 if (WARN_ON(!old_ctx)) 1141 return -EINVAL; 1142 1143 if (WARN_ON(new_ctx->replace_state == 1144 IEEE80211_CHANCTX_REPLACES_OTHER)) 1145 return -EINVAL; 1146 1147 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1148 &sdata->reserved_chandef); 1149 if (WARN_ON(!chandef)) 1150 return -EINVAL; 1151 1152 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1153 changed = BSS_CHANGED_BANDWIDTH; 1154 1155 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1156 1157 ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef); 1158 1159 vif_chsw[0].vif = &sdata->vif; 1160 vif_chsw[0].old_ctx = &old_ctx->conf; 1161 vif_chsw[0].new_ctx = &new_ctx->conf; 1162 1163 list_del(&sdata->reserved_chanctx_list); 1164 sdata->reserved_chanctx = NULL; 1165 1166 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1167 CHANCTX_SWMODE_REASSIGN_VIF); 1168 if (err) { 1169 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1170 ieee80211_free_chanctx(local, new_ctx); 1171 1172 goto out; 1173 } 1174 1175 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1176 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1177 1178 if (sdata->vif.type == NL80211_IFTYPE_AP) 1179 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1180 1181 ieee80211_check_fast_xmit_iface(sdata); 1182 1183 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1184 ieee80211_free_chanctx(local, old_ctx); 1185 1186 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1187 ieee80211_recalc_smps_chanctx(local, new_ctx); 1188 ieee80211_recalc_radar_chanctx(local, new_ctx); 1189 1190 if (changed) 1191 ieee80211_bss_info_change_notify(sdata, changed); 1192 1193 out: 1194 ieee80211_vif_chanctx_reservation_complete(sdata); 1195 return err; 1196 } 1197 1198 static int 1199 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1200 { 1201 struct ieee80211_local *local = sdata->local; 1202 struct ieee80211_chanctx *old_ctx, *new_ctx; 1203 const struct cfg80211_chan_def *chandef; 1204 int err; 1205 1206 old_ctx = ieee80211_vif_get_chanctx(sdata); 1207 new_ctx = sdata->reserved_chanctx; 1208 1209 if (WARN_ON(!sdata->reserved_ready)) 1210 return -EINVAL; 1211 1212 if (WARN_ON(old_ctx)) 1213 return -EINVAL; 1214 1215 if (WARN_ON(!new_ctx)) 1216 return -EINVAL; 1217 1218 if (WARN_ON(new_ctx->replace_state == 1219 IEEE80211_CHANCTX_REPLACES_OTHER)) 1220 return -EINVAL; 1221 1222 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1223 &sdata->reserved_chandef); 1224 if (WARN_ON(!chandef)) 1225 return -EINVAL; 1226 1227 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef); 1228 1229 list_del(&sdata->reserved_chanctx_list); 1230 sdata->reserved_chanctx = NULL; 1231 1232 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1233 if (err) { 1234 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1235 ieee80211_free_chanctx(local, new_ctx); 1236 1237 goto out; 1238 } 1239 1240 out: 1241 ieee80211_vif_chanctx_reservation_complete(sdata); 1242 return err; 1243 } 1244 1245 static bool 1246 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1247 { 1248 struct ieee80211_chanctx *old_ctx, *new_ctx; 1249 1250 lockdep_assert_held(&sdata->local->chanctx_mtx); 1251 1252 new_ctx = sdata->reserved_chanctx; 1253 old_ctx = ieee80211_vif_get_chanctx(sdata); 1254 1255 if (!old_ctx) 1256 return false; 1257 1258 if (WARN_ON(!new_ctx)) 1259 return false; 1260 1261 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1262 return false; 1263 1264 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1265 return false; 1266 1267 return true; 1268 } 1269 1270 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1271 struct ieee80211_chanctx *new_ctx) 1272 { 1273 const struct cfg80211_chan_def *chandef; 1274 1275 lockdep_assert_held(&local->mtx); 1276 lockdep_assert_held(&local->chanctx_mtx); 1277 1278 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1279 if (WARN_ON(!chandef)) 1280 return -EINVAL; 1281 1282 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1283 local->_oper_chandef = *chandef; 1284 ieee80211_hw_config(local, 0); 1285 1286 return 0; 1287 } 1288 1289 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1290 int n_vifs) 1291 { 1292 struct ieee80211_vif_chanctx_switch *vif_chsw; 1293 struct ieee80211_sub_if_data *sdata; 1294 struct ieee80211_chanctx *ctx, *old_ctx; 1295 int i, err; 1296 1297 lockdep_assert_held(&local->mtx); 1298 lockdep_assert_held(&local->chanctx_mtx); 1299 1300 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1301 if (!vif_chsw) 1302 return -ENOMEM; 1303 1304 i = 0; 1305 list_for_each_entry(ctx, &local->chanctx_list, list) { 1306 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1307 continue; 1308 1309 if (WARN_ON(!ctx->replace_ctx)) { 1310 err = -EINVAL; 1311 goto out; 1312 } 1313 1314 list_for_each_entry(sdata, &ctx->reserved_vifs, 1315 reserved_chanctx_list) { 1316 if (!ieee80211_vif_has_in_place_reservation( 1317 sdata)) 1318 continue; 1319 1320 old_ctx = ieee80211_vif_get_chanctx(sdata); 1321 vif_chsw[i].vif = &sdata->vif; 1322 vif_chsw[i].old_ctx = &old_ctx->conf; 1323 vif_chsw[i].new_ctx = &ctx->conf; 1324 1325 i++; 1326 } 1327 } 1328 1329 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1330 CHANCTX_SWMODE_SWAP_CONTEXTS); 1331 1332 out: 1333 kfree(vif_chsw); 1334 return err; 1335 } 1336 1337 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1338 { 1339 struct ieee80211_chanctx *ctx; 1340 int err; 1341 1342 lockdep_assert_held(&local->mtx); 1343 lockdep_assert_held(&local->chanctx_mtx); 1344 1345 list_for_each_entry(ctx, &local->chanctx_list, list) { 1346 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1347 continue; 1348 1349 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1350 continue; 1351 1352 ieee80211_del_chanctx(local, ctx->replace_ctx); 1353 err = ieee80211_add_chanctx(local, ctx); 1354 if (err) 1355 goto err; 1356 } 1357 1358 return 0; 1359 1360 err: 1361 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1362 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1363 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1364 continue; 1365 1366 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1367 continue; 1368 1369 ieee80211_del_chanctx(local, ctx); 1370 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1371 } 1372 1373 return err; 1374 } 1375 1376 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1377 { 1378 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1379 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1380 struct ieee80211_chanctx *new_ctx = NULL; 1381 int err, n_assigned, n_reserved, n_ready; 1382 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1383 1384 lockdep_assert_held(&local->mtx); 1385 lockdep_assert_held(&local->chanctx_mtx); 1386 1387 /* 1388 * If there are 2 independent pairs of channel contexts performing 1389 * cross-switch of their vifs this code will still wait until both are 1390 * ready even though it could be possible to switch one before the 1391 * other is ready. 1392 * 1393 * For practical reasons and code simplicity just do a single huge 1394 * switch. 1395 */ 1396 1397 /* 1398 * Verify if the reservation is still feasible. 1399 * - if it's not then disconnect 1400 * - if it is but not all vifs necessary are ready then defer 1401 */ 1402 1403 list_for_each_entry(ctx, &local->chanctx_list, list) { 1404 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1405 continue; 1406 1407 if (WARN_ON(!ctx->replace_ctx)) { 1408 err = -EINVAL; 1409 goto err; 1410 } 1411 1412 if (!local->use_chanctx) 1413 new_ctx = ctx; 1414 1415 n_ctx++; 1416 1417 n_assigned = 0; 1418 n_reserved = 0; 1419 n_ready = 0; 1420 1421 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1422 assigned_chanctx_list) { 1423 n_assigned++; 1424 if (sdata->reserved_chanctx) { 1425 n_reserved++; 1426 if (sdata->reserved_ready) 1427 n_ready++; 1428 } 1429 } 1430 1431 if (n_assigned != n_reserved) { 1432 if (n_ready == n_reserved) { 1433 wiphy_info(local->hw.wiphy, 1434 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1435 err = -EBUSY; 1436 goto err; 1437 } 1438 1439 return -EAGAIN; 1440 } 1441 1442 ctx->conf.radar_enabled = false; 1443 list_for_each_entry(sdata, &ctx->reserved_vifs, 1444 reserved_chanctx_list) { 1445 if (ieee80211_vif_has_in_place_reservation(sdata) && 1446 !sdata->reserved_ready) 1447 return -EAGAIN; 1448 1449 old_ctx = ieee80211_vif_get_chanctx(sdata); 1450 if (old_ctx) { 1451 if (old_ctx->replace_state == 1452 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1453 n_vifs_switch++; 1454 else 1455 n_vifs_assign++; 1456 } else { 1457 n_vifs_ctxless++; 1458 } 1459 1460 if (sdata->reserved_radar_required) 1461 ctx->conf.radar_enabled = true; 1462 } 1463 } 1464 1465 if (WARN_ON(n_ctx == 0) || 1466 WARN_ON(n_vifs_switch == 0 && 1467 n_vifs_assign == 0 && 1468 n_vifs_ctxless == 0) || 1469 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1470 WARN_ON(!new_ctx && !local->use_chanctx)) { 1471 err = -EINVAL; 1472 goto err; 1473 } 1474 1475 /* 1476 * All necessary vifs are ready. Perform the switch now depending on 1477 * reservations and driver capabilities. 1478 */ 1479 1480 if (local->use_chanctx) { 1481 if (n_vifs_switch > 0) { 1482 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1483 if (err) 1484 goto err; 1485 } 1486 1487 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1488 err = ieee80211_chsw_switch_ctxs(local); 1489 if (err) 1490 goto err; 1491 } 1492 } else { 1493 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1494 if (err) 1495 goto err; 1496 } 1497 1498 /* 1499 * Update all structures, values and pointers to point to new channel 1500 * context(s). 1501 */ 1502 list_for_each_entry(ctx, &local->chanctx_list, list) { 1503 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1504 continue; 1505 1506 if (WARN_ON(!ctx->replace_ctx)) { 1507 err = -EINVAL; 1508 goto err; 1509 } 1510 1511 list_for_each_entry(sdata, &ctx->reserved_vifs, 1512 reserved_chanctx_list) { 1513 u32 changed = 0; 1514 1515 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1516 continue; 1517 1518 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1519 1520 if (sdata->vif.type == NL80211_IFTYPE_AP) 1521 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1522 false); 1523 1524 ieee80211_check_fast_xmit_iface(sdata); 1525 1526 sdata->radar_required = sdata->reserved_radar_required; 1527 1528 if (sdata->vif.bss_conf.chandef.width != 1529 sdata->reserved_chandef.width) 1530 changed = BSS_CHANGED_BANDWIDTH; 1531 1532 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1533 if (changed) 1534 ieee80211_bss_info_change_notify(sdata, 1535 changed); 1536 1537 ieee80211_recalc_txpower(sdata, false); 1538 } 1539 1540 ieee80211_recalc_chanctx_chantype(local, ctx); 1541 ieee80211_recalc_smps_chanctx(local, ctx); 1542 ieee80211_recalc_radar_chanctx(local, ctx); 1543 ieee80211_recalc_chanctx_min_def(local, ctx); 1544 1545 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1546 reserved_chanctx_list) { 1547 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1548 continue; 1549 1550 list_del(&sdata->reserved_chanctx_list); 1551 list_move(&sdata->assigned_chanctx_list, 1552 &ctx->assigned_vifs); 1553 sdata->reserved_chanctx = NULL; 1554 1555 ieee80211_vif_chanctx_reservation_complete(sdata); 1556 } 1557 1558 /* 1559 * This context might have been a dependency for an already 1560 * ready re-assign reservation interface that was deferred. Do 1561 * not propagate error to the caller though. The in-place 1562 * reservation for originally requested interface has already 1563 * succeeded at this point. 1564 */ 1565 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1566 reserved_chanctx_list) { 1567 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1568 sdata))) 1569 continue; 1570 1571 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1572 continue; 1573 1574 if (!sdata->reserved_ready) 1575 continue; 1576 1577 if (ieee80211_vif_get_chanctx(sdata)) 1578 err = ieee80211_vif_use_reserved_reassign( 1579 sdata); 1580 else 1581 err = ieee80211_vif_use_reserved_assign(sdata); 1582 1583 if (err) { 1584 sdata_info(sdata, 1585 "failed to finalize (re-)assign reservation (err=%d)\n", 1586 err); 1587 ieee80211_vif_unreserve_chanctx(sdata); 1588 cfg80211_stop_iface(local->hw.wiphy, 1589 &sdata->wdev, 1590 GFP_KERNEL); 1591 } 1592 } 1593 } 1594 1595 /* 1596 * Finally free old contexts 1597 */ 1598 1599 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1600 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1601 continue; 1602 1603 ctx->replace_ctx->replace_ctx = NULL; 1604 ctx->replace_ctx->replace_state = 1605 IEEE80211_CHANCTX_REPLACE_NONE; 1606 1607 list_del_rcu(&ctx->list); 1608 kfree_rcu(ctx, rcu_head); 1609 } 1610 1611 return 0; 1612 1613 err: 1614 list_for_each_entry(ctx, &local->chanctx_list, list) { 1615 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1616 continue; 1617 1618 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1619 reserved_chanctx_list) { 1620 ieee80211_vif_unreserve_chanctx(sdata); 1621 ieee80211_vif_chanctx_reservation_complete(sdata); 1622 } 1623 } 1624 1625 return err; 1626 } 1627 1628 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1629 { 1630 struct ieee80211_local *local = sdata->local; 1631 struct ieee80211_chanctx_conf *conf; 1632 struct ieee80211_chanctx *ctx; 1633 bool use_reserved_switch = false; 1634 1635 lockdep_assert_held(&local->chanctx_mtx); 1636 1637 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1638 lockdep_is_held(&local->chanctx_mtx)); 1639 if (!conf) 1640 return; 1641 1642 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1643 1644 if (sdata->reserved_chanctx) { 1645 if (sdata->reserved_chanctx->replace_state == 1646 IEEE80211_CHANCTX_REPLACES_OTHER && 1647 ieee80211_chanctx_num_reserved(local, 1648 sdata->reserved_chanctx) > 1) 1649 use_reserved_switch = true; 1650 1651 ieee80211_vif_unreserve_chanctx(sdata); 1652 } 1653 1654 ieee80211_assign_vif_chanctx(sdata, NULL); 1655 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1656 ieee80211_free_chanctx(local, ctx); 1657 1658 sdata->radar_required = false; 1659 1660 /* Unreserving may ready an in-place reservation. */ 1661 if (use_reserved_switch) 1662 ieee80211_vif_use_reserved_switch(local); 1663 } 1664 1665 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1666 const struct cfg80211_chan_def *chandef, 1667 enum ieee80211_chanctx_mode mode) 1668 { 1669 struct ieee80211_local *local = sdata->local; 1670 struct ieee80211_chanctx *ctx; 1671 u8 radar_detect_width = 0; 1672 int ret; 1673 1674 lockdep_assert_held(&local->mtx); 1675 1676 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1677 1678 mutex_lock(&local->chanctx_mtx); 1679 1680 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1681 chandef, 1682 sdata->wdev.iftype); 1683 if (ret < 0) 1684 goto out; 1685 if (ret > 0) 1686 radar_detect_width = BIT(chandef->width); 1687 1688 sdata->radar_required = ret; 1689 1690 ret = ieee80211_check_combinations(sdata, chandef, mode, 1691 radar_detect_width); 1692 if (ret < 0) 1693 goto out; 1694 1695 __ieee80211_vif_release_channel(sdata); 1696 1697 ctx = ieee80211_find_chanctx(local, chandef, mode); 1698 if (!ctx) 1699 ctx = ieee80211_new_chanctx(local, chandef, mode); 1700 if (IS_ERR(ctx)) { 1701 ret = PTR_ERR(ctx); 1702 goto out; 1703 } 1704 1705 ieee80211_vif_update_chandef(sdata, chandef); 1706 1707 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1708 if (ret) { 1709 /* if assign fails refcount stays the same */ 1710 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1711 ieee80211_free_chanctx(local, ctx); 1712 goto out; 1713 } 1714 1715 ieee80211_recalc_smps_chanctx(local, ctx); 1716 ieee80211_recalc_radar_chanctx(local, ctx); 1717 out: 1718 if (ret) 1719 sdata->radar_required = false; 1720 1721 mutex_unlock(&local->chanctx_mtx); 1722 return ret; 1723 } 1724 1725 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1726 { 1727 struct ieee80211_local *local = sdata->local; 1728 struct ieee80211_chanctx *new_ctx; 1729 struct ieee80211_chanctx *old_ctx; 1730 int err; 1731 1732 lockdep_assert_held(&local->mtx); 1733 lockdep_assert_held(&local->chanctx_mtx); 1734 1735 new_ctx = sdata->reserved_chanctx; 1736 old_ctx = ieee80211_vif_get_chanctx(sdata); 1737 1738 if (WARN_ON(!new_ctx)) 1739 return -EINVAL; 1740 1741 if (WARN_ON(new_ctx->replace_state == 1742 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1743 return -EINVAL; 1744 1745 if (WARN_ON(sdata->reserved_ready)) 1746 return -EINVAL; 1747 1748 sdata->reserved_ready = true; 1749 1750 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1751 if (old_ctx) 1752 return ieee80211_vif_use_reserved_reassign(sdata); 1753 1754 return ieee80211_vif_use_reserved_assign(sdata); 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