1 /* 2 * mac80211 - channel management 3 */ 4 5 #include <linux/nl80211.h> 6 #include <linux/export.h> 7 #include <linux/rtnetlink.h> 8 #include <net/cfg80211.h> 9 #include "ieee80211_i.h" 10 #include "driver-ops.h" 11 12 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local, 13 struct ieee80211_chanctx *ctx) 14 { 15 struct ieee80211_sub_if_data *sdata; 16 int num = 0; 17 18 lockdep_assert_held(&local->chanctx_mtx); 19 20 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list) 21 num++; 22 23 return num; 24 } 25 26 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local, 27 struct ieee80211_chanctx *ctx) 28 { 29 struct ieee80211_sub_if_data *sdata; 30 int num = 0; 31 32 lockdep_assert_held(&local->chanctx_mtx); 33 34 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list) 35 num++; 36 37 return num; 38 } 39 40 int ieee80211_chanctx_refcount(struct ieee80211_local *local, 41 struct ieee80211_chanctx *ctx) 42 { 43 return ieee80211_chanctx_num_assigned(local, ctx) + 44 ieee80211_chanctx_num_reserved(local, ctx); 45 } 46 47 static int ieee80211_num_chanctx(struct ieee80211_local *local) 48 { 49 struct ieee80211_chanctx *ctx; 50 int num = 0; 51 52 lockdep_assert_held(&local->chanctx_mtx); 53 54 list_for_each_entry(ctx, &local->chanctx_list, list) 55 num++; 56 57 return num; 58 } 59 60 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) 61 { 62 lockdep_assert_held(&local->chanctx_mtx); 63 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); 64 } 65 66 static struct ieee80211_chanctx * 67 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata) 68 { 69 struct ieee80211_local *local __maybe_unused = sdata->local; 70 struct ieee80211_chanctx_conf *conf; 71 72 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 73 lockdep_is_held(&local->chanctx_mtx)); 74 if (!conf) 75 return NULL; 76 77 return container_of(conf, struct ieee80211_chanctx, conf); 78 } 79 80 static const struct cfg80211_chan_def * 81 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local, 82 struct ieee80211_chanctx *ctx, 83 const struct cfg80211_chan_def *compat) 84 { 85 struct ieee80211_sub_if_data *sdata; 86 87 lockdep_assert_held(&local->chanctx_mtx); 88 89 list_for_each_entry(sdata, &ctx->reserved_vifs, 90 reserved_chanctx_list) { 91 if (!compat) 92 compat = &sdata->reserved_chandef; 93 94 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef, 95 compat); 96 if (!compat) 97 break; 98 } 99 100 return compat; 101 } 102 103 static const struct cfg80211_chan_def * 104 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local, 105 struct ieee80211_chanctx *ctx, 106 const struct cfg80211_chan_def *compat) 107 { 108 struct ieee80211_sub_if_data *sdata; 109 110 lockdep_assert_held(&local->chanctx_mtx); 111 112 list_for_each_entry(sdata, &ctx->assigned_vifs, 113 assigned_chanctx_list) { 114 if (sdata->reserved_chanctx != NULL) 115 continue; 116 117 if (!compat) 118 compat = &sdata->vif.bss_conf.chandef; 119 120 compat = cfg80211_chandef_compatible( 121 &sdata->vif.bss_conf.chandef, compat); 122 if (!compat) 123 break; 124 } 125 126 return compat; 127 } 128 129 static const struct cfg80211_chan_def * 130 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local, 131 struct ieee80211_chanctx *ctx, 132 const struct cfg80211_chan_def *compat) 133 { 134 lockdep_assert_held(&local->chanctx_mtx); 135 136 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat); 137 if (!compat) 138 return NULL; 139 140 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat); 141 if (!compat) 142 return NULL; 143 144 return compat; 145 } 146 147 static bool 148 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local, 149 struct ieee80211_chanctx *ctx, 150 const struct cfg80211_chan_def *def) 151 { 152 lockdep_assert_held(&local->chanctx_mtx); 153 154 if (ieee80211_chanctx_combined_chandef(local, ctx, def)) 155 return true; 156 157 if (!list_empty(&ctx->reserved_vifs) && 158 ieee80211_chanctx_reserved_chandef(local, ctx, def)) 159 return true; 160 161 return false; 162 } 163 164 static struct ieee80211_chanctx * 165 ieee80211_find_reservation_chanctx(struct ieee80211_local *local, 166 const struct cfg80211_chan_def *chandef, 167 enum ieee80211_chanctx_mode mode) 168 { 169 struct ieee80211_chanctx *ctx; 170 171 lockdep_assert_held(&local->chanctx_mtx); 172 173 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 174 return NULL; 175 176 list_for_each_entry(ctx, &local->chanctx_list, list) { 177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 178 continue; 179 180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 181 continue; 182 183 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx, 184 chandef)) 185 continue; 186 187 return ctx; 188 } 189 190 return NULL; 191 } 192 193 enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta) 194 { 195 switch (sta->bandwidth) { 196 case IEEE80211_STA_RX_BW_20: 197 if (sta->ht_cap.ht_supported) 198 return NL80211_CHAN_WIDTH_20; 199 else 200 return NL80211_CHAN_WIDTH_20_NOHT; 201 case IEEE80211_STA_RX_BW_40: 202 return NL80211_CHAN_WIDTH_40; 203 case IEEE80211_STA_RX_BW_80: 204 return NL80211_CHAN_WIDTH_80; 205 case IEEE80211_STA_RX_BW_160: 206 /* 207 * This applied for both 160 and 80+80. since we use 208 * the returned value to consider degradation of 209 * ctx->conf.min_def, we have to make sure to take 210 * the bigger one (NL80211_CHAN_WIDTH_160). 211 * Otherwise we might try degrading even when not 212 * needed, as the max required sta_bw returned (80+80) 213 * might be smaller than the configured bw (160). 214 */ 215 return NL80211_CHAN_WIDTH_160; 216 default: 217 WARN_ON(1); 218 return NL80211_CHAN_WIDTH_20; 219 } 220 } 221 222 static enum nl80211_chan_width 223 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata) 224 { 225 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 226 struct sta_info *sta; 227 228 rcu_read_lock(); 229 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 230 if (sdata != sta->sdata && 231 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 232 continue; 233 234 if (!sta->uploaded || !test_sta_flag(sta, WLAN_STA_ASSOC)) 235 continue; 236 237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta)); 238 } 239 rcu_read_unlock(); 240 241 return max_bw; 242 } 243 244 static enum nl80211_chan_width 245 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 246 struct ieee80211_chanctx_conf *conf) 247 { 248 struct ieee80211_sub_if_data *sdata; 249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 250 251 rcu_read_lock(); 252 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 253 struct ieee80211_vif *vif = &sdata->vif; 254 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 255 256 if (!ieee80211_sdata_running(sdata)) 257 continue; 258 259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 260 continue; 261 262 switch (vif->type) { 263 case NL80211_IFTYPE_AP: 264 case NL80211_IFTYPE_AP_VLAN: 265 width = ieee80211_get_max_required_bw(sdata); 266 break; 267 case NL80211_IFTYPE_STATION: 268 /* 269 * The ap's sta->bandwidth is not set yet at this 270 * point, so take the width from the chandef, but 271 * account also for TDLS peers 272 */ 273 width = max(vif->bss_conf.chandef.width, 274 ieee80211_get_max_required_bw(sdata)); 275 break; 276 case NL80211_IFTYPE_P2P_DEVICE: 277 continue; 278 case NL80211_IFTYPE_ADHOC: 279 case NL80211_IFTYPE_WDS: 280 case NL80211_IFTYPE_MESH_POINT: 281 case NL80211_IFTYPE_OCB: 282 width = vif->bss_conf.chandef.width; 283 break; 284 case NL80211_IFTYPE_UNSPECIFIED: 285 case NUM_NL80211_IFTYPES: 286 case NL80211_IFTYPE_MONITOR: 287 case NL80211_IFTYPE_P2P_CLIENT: 288 case NL80211_IFTYPE_P2P_GO: 289 WARN_ON_ONCE(1); 290 } 291 max_bw = max(max_bw, width); 292 } 293 294 /* use the configured bandwidth in case of monitor interface */ 295 sdata = rcu_dereference(local->monitor_sdata); 296 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 297 max_bw = max(max_bw, conf->def.width); 298 299 rcu_read_unlock(); 300 301 return max_bw; 302 } 303 304 /* 305 * recalc the min required chan width of the channel context, which is 306 * the max of min required widths of all the interfaces bound to this 307 * channel context. 308 */ 309 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 310 struct ieee80211_chanctx *ctx) 311 { 312 enum nl80211_chan_width max_bw; 313 struct cfg80211_chan_def min_def; 314 315 lockdep_assert_held(&local->chanctx_mtx); 316 317 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */ 318 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 319 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 320 ctx->conf.radar_enabled) { 321 ctx->conf.min_def = ctx->conf.def; 322 return; 323 } 324 325 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 326 327 /* downgrade chandef up to max_bw */ 328 min_def = ctx->conf.def; 329 while (min_def.width > max_bw) 330 ieee80211_chandef_downgrade(&min_def); 331 332 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 333 return; 334 335 ctx->conf.min_def = min_def; 336 if (!ctx->driver_present) 337 return; 338 339 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH); 340 } 341 342 static void ieee80211_change_chanctx(struct ieee80211_local *local, 343 struct ieee80211_chanctx *ctx, 344 const struct cfg80211_chan_def *chandef) 345 { 346 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 347 ieee80211_recalc_chanctx_min_def(local, ctx); 348 return; 349 } 350 351 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 352 353 ctx->conf.def = *chandef; 354 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); 355 ieee80211_recalc_chanctx_min_def(local, ctx); 356 357 if (!local->use_chanctx) { 358 local->_oper_chandef = *chandef; 359 ieee80211_hw_config(local, 0); 360 } 361 } 362 363 static struct ieee80211_chanctx * 364 ieee80211_find_chanctx(struct ieee80211_local *local, 365 const struct cfg80211_chan_def *chandef, 366 enum ieee80211_chanctx_mode mode) 367 { 368 struct ieee80211_chanctx *ctx; 369 370 lockdep_assert_held(&local->chanctx_mtx); 371 372 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 373 return NULL; 374 375 list_for_each_entry(ctx, &local->chanctx_list, list) { 376 const struct cfg80211_chan_def *compat; 377 378 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 379 continue; 380 381 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 382 continue; 383 384 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 385 if (!compat) 386 continue; 387 388 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 389 compat); 390 if (!compat) 391 continue; 392 393 ieee80211_change_chanctx(local, ctx, compat); 394 395 return ctx; 396 } 397 398 return NULL; 399 } 400 401 bool ieee80211_is_radar_required(struct ieee80211_local *local) 402 { 403 struct ieee80211_sub_if_data *sdata; 404 405 lockdep_assert_held(&local->mtx); 406 407 rcu_read_lock(); 408 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 409 if (sdata->radar_required) { 410 rcu_read_unlock(); 411 return true; 412 } 413 } 414 rcu_read_unlock(); 415 416 return false; 417 } 418 419 static bool 420 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 421 struct ieee80211_chanctx *ctx) 422 { 423 struct ieee80211_chanctx_conf *conf = &ctx->conf; 424 struct ieee80211_sub_if_data *sdata; 425 bool required = false; 426 427 lockdep_assert_held(&local->chanctx_mtx); 428 lockdep_assert_held(&local->mtx); 429 430 rcu_read_lock(); 431 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 432 if (!ieee80211_sdata_running(sdata)) 433 continue; 434 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 435 continue; 436 if (!sdata->radar_required) 437 continue; 438 439 required = true; 440 break; 441 } 442 rcu_read_unlock(); 443 444 return required; 445 } 446 447 static struct ieee80211_chanctx * 448 ieee80211_alloc_chanctx(struct ieee80211_local *local, 449 const struct cfg80211_chan_def *chandef, 450 enum ieee80211_chanctx_mode mode) 451 { 452 struct ieee80211_chanctx *ctx; 453 454 lockdep_assert_held(&local->chanctx_mtx); 455 456 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 457 if (!ctx) 458 return NULL; 459 460 INIT_LIST_HEAD(&ctx->assigned_vifs); 461 INIT_LIST_HEAD(&ctx->reserved_vifs); 462 ctx->conf.def = *chandef; 463 ctx->conf.rx_chains_static = 1; 464 ctx->conf.rx_chains_dynamic = 1; 465 ctx->mode = mode; 466 ctx->conf.radar_enabled = false; 467 ieee80211_recalc_chanctx_min_def(local, ctx); 468 469 return ctx; 470 } 471 472 static int ieee80211_add_chanctx(struct ieee80211_local *local, 473 struct ieee80211_chanctx *ctx) 474 { 475 u32 changed; 476 int err; 477 478 lockdep_assert_held(&local->mtx); 479 lockdep_assert_held(&local->chanctx_mtx); 480 481 if (!local->use_chanctx) 482 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 483 484 /* turn idle off *before* setting channel -- some drivers need that */ 485 changed = ieee80211_idle_off(local); 486 if (changed) 487 ieee80211_hw_config(local, changed); 488 489 if (!local->use_chanctx) { 490 local->_oper_chandef = ctx->conf.def; 491 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 492 } else { 493 err = drv_add_chanctx(local, ctx); 494 if (err) { 495 ieee80211_recalc_idle(local); 496 return err; 497 } 498 } 499 500 return 0; 501 } 502 503 static struct ieee80211_chanctx * 504 ieee80211_new_chanctx(struct ieee80211_local *local, 505 const struct cfg80211_chan_def *chandef, 506 enum ieee80211_chanctx_mode mode) 507 { 508 struct ieee80211_chanctx *ctx; 509 int err; 510 511 lockdep_assert_held(&local->mtx); 512 lockdep_assert_held(&local->chanctx_mtx); 513 514 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 515 if (!ctx) 516 return ERR_PTR(-ENOMEM); 517 518 err = ieee80211_add_chanctx(local, ctx); 519 if (err) { 520 kfree(ctx); 521 return ERR_PTR(err); 522 } 523 524 list_add_rcu(&ctx->list, &local->chanctx_list); 525 return ctx; 526 } 527 528 static void ieee80211_del_chanctx(struct ieee80211_local *local, 529 struct ieee80211_chanctx *ctx) 530 { 531 lockdep_assert_held(&local->chanctx_mtx); 532 533 if (!local->use_chanctx) { 534 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 535 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 536 chandef->center_freq1 = chandef->chan->center_freq; 537 chandef->center_freq2 = 0; 538 539 /* NOTE: Disabling radar is only valid here for 540 * single channel context. To be sure, check it ... 541 */ 542 WARN_ON(local->hw.conf.radar_enabled && 543 !list_empty(&local->chanctx_list)); 544 545 local->hw.conf.radar_enabled = false; 546 547 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 548 } else { 549 drv_remove_chanctx(local, ctx); 550 } 551 552 ieee80211_recalc_idle(local); 553 } 554 555 static void ieee80211_free_chanctx(struct ieee80211_local *local, 556 struct ieee80211_chanctx *ctx) 557 { 558 lockdep_assert_held(&local->chanctx_mtx); 559 560 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 561 562 list_del_rcu(&ctx->list); 563 ieee80211_del_chanctx(local, ctx); 564 kfree_rcu(ctx, rcu_head); 565 } 566 567 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 568 struct ieee80211_chanctx *ctx) 569 { 570 struct ieee80211_chanctx_conf *conf = &ctx->conf; 571 struct ieee80211_sub_if_data *sdata; 572 const struct cfg80211_chan_def *compat = NULL; 573 struct sta_info *sta; 574 575 lockdep_assert_held(&local->chanctx_mtx); 576 577 rcu_read_lock(); 578 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 579 580 if (!ieee80211_sdata_running(sdata)) 581 continue; 582 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 583 continue; 584 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 585 continue; 586 587 if (!compat) 588 compat = &sdata->vif.bss_conf.chandef; 589 590 compat = cfg80211_chandef_compatible( 591 &sdata->vif.bss_conf.chandef, compat); 592 if (WARN_ON_ONCE(!compat)) 593 break; 594 } 595 596 /* TDLS peers can sometimes affect the chandef width */ 597 list_for_each_entry_rcu(sta, &local->sta_list, list) { 598 if (!sta->uploaded || 599 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 600 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 601 !sta->tdls_chandef.chan) 602 continue; 603 604 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 605 compat); 606 if (WARN_ON_ONCE(!compat)) 607 break; 608 } 609 rcu_read_unlock(); 610 611 if (!compat) 612 return; 613 614 ieee80211_change_chanctx(local, ctx, compat); 615 } 616 617 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 618 struct ieee80211_chanctx *chanctx) 619 { 620 bool radar_enabled; 621 622 lockdep_assert_held(&local->chanctx_mtx); 623 /* for ieee80211_is_radar_required */ 624 lockdep_assert_held(&local->mtx); 625 626 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 627 628 if (radar_enabled == chanctx->conf.radar_enabled) 629 return; 630 631 chanctx->conf.radar_enabled = radar_enabled; 632 633 if (!local->use_chanctx) { 634 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 635 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 636 } 637 638 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 639 } 640 641 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 642 struct ieee80211_chanctx *new_ctx) 643 { 644 struct ieee80211_local *local = sdata->local; 645 struct ieee80211_chanctx_conf *conf; 646 struct ieee80211_chanctx *curr_ctx = NULL; 647 int ret = 0; 648 649 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 650 lockdep_is_held(&local->chanctx_mtx)); 651 652 if (conf) { 653 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 654 655 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 656 conf = NULL; 657 list_del(&sdata->assigned_chanctx_list); 658 } 659 660 if (new_ctx) { 661 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 662 if (ret) 663 goto out; 664 665 conf = &new_ctx->conf; 666 list_add(&sdata->assigned_chanctx_list, 667 &new_ctx->assigned_vifs); 668 } 669 670 out: 671 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 672 673 sdata->vif.bss_conf.idle = !conf; 674 675 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 676 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 677 ieee80211_recalc_smps_chanctx(local, curr_ctx); 678 ieee80211_recalc_radar_chanctx(local, curr_ctx); 679 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 680 } 681 682 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 683 ieee80211_recalc_txpower(sdata, false); 684 ieee80211_recalc_chanctx_min_def(local, new_ctx); 685 } 686 687 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 688 sdata->vif.type != NL80211_IFTYPE_MONITOR) 689 ieee80211_bss_info_change_notify(sdata, 690 BSS_CHANGED_IDLE); 691 692 ieee80211_check_fast_xmit_iface(sdata); 693 694 return ret; 695 } 696 697 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 698 struct ieee80211_chanctx *chanctx) 699 { 700 struct ieee80211_sub_if_data *sdata; 701 u8 rx_chains_static, rx_chains_dynamic; 702 703 lockdep_assert_held(&local->chanctx_mtx); 704 705 rx_chains_static = 1; 706 rx_chains_dynamic = 1; 707 708 rcu_read_lock(); 709 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 710 u8 needed_static, needed_dynamic; 711 712 if (!ieee80211_sdata_running(sdata)) 713 continue; 714 715 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 716 &chanctx->conf) 717 continue; 718 719 switch (sdata->vif.type) { 720 case NL80211_IFTYPE_P2P_DEVICE: 721 continue; 722 case NL80211_IFTYPE_STATION: 723 if (!sdata->u.mgd.associated) 724 continue; 725 break; 726 case NL80211_IFTYPE_AP_VLAN: 727 continue; 728 case NL80211_IFTYPE_AP: 729 case NL80211_IFTYPE_ADHOC: 730 case NL80211_IFTYPE_WDS: 731 case NL80211_IFTYPE_MESH_POINT: 732 case NL80211_IFTYPE_OCB: 733 break; 734 default: 735 WARN_ON_ONCE(1); 736 } 737 738 switch (sdata->smps_mode) { 739 default: 740 WARN_ONCE(1, "Invalid SMPS mode %d\n", 741 sdata->smps_mode); 742 /* fall through */ 743 case IEEE80211_SMPS_OFF: 744 needed_static = sdata->needed_rx_chains; 745 needed_dynamic = sdata->needed_rx_chains; 746 break; 747 case IEEE80211_SMPS_DYNAMIC: 748 needed_static = 1; 749 needed_dynamic = sdata->needed_rx_chains; 750 break; 751 case IEEE80211_SMPS_STATIC: 752 needed_static = 1; 753 needed_dynamic = 1; 754 break; 755 } 756 757 rx_chains_static = max(rx_chains_static, needed_static); 758 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 759 } 760 761 /* Disable SMPS for the monitor interface */ 762 sdata = rcu_dereference(local->monitor_sdata); 763 if (sdata && 764 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 765 rx_chains_dynamic = rx_chains_static = local->rx_chains; 766 767 rcu_read_unlock(); 768 769 if (!local->use_chanctx) { 770 if (rx_chains_static > 1) 771 local->smps_mode = IEEE80211_SMPS_OFF; 772 else if (rx_chains_dynamic > 1) 773 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 774 else 775 local->smps_mode = IEEE80211_SMPS_STATIC; 776 ieee80211_hw_config(local, 0); 777 } 778 779 if (rx_chains_static == chanctx->conf.rx_chains_static && 780 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 781 return; 782 783 chanctx->conf.rx_chains_static = rx_chains_static; 784 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 785 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 786 } 787 788 static void 789 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 790 bool clear) 791 { 792 struct ieee80211_local *local __maybe_unused = sdata->local; 793 struct ieee80211_sub_if_data *vlan; 794 struct ieee80211_chanctx_conf *conf; 795 796 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 797 return; 798 799 lockdep_assert_held(&local->mtx); 800 801 /* Check that conf exists, even when clearing this function 802 * must be called with the AP's channel context still there 803 * as it would otherwise cause VLANs to have an invalid 804 * channel context pointer for a while, possibly pointing 805 * to a channel context that has already been freed. 806 */ 807 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 808 lockdep_is_held(&local->chanctx_mtx)); 809 WARN_ON(!conf); 810 811 if (clear) 812 conf = NULL; 813 814 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 815 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 816 } 817 818 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 819 bool clear) 820 { 821 struct ieee80211_local *local = sdata->local; 822 823 mutex_lock(&local->chanctx_mtx); 824 825 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 826 827 mutex_unlock(&local->chanctx_mtx); 828 } 829 830 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 831 { 832 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 833 834 lockdep_assert_held(&sdata->local->chanctx_mtx); 835 836 if (WARN_ON(!ctx)) 837 return -EINVAL; 838 839 list_del(&sdata->reserved_chanctx_list); 840 sdata->reserved_chanctx = NULL; 841 842 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 843 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 844 if (WARN_ON(!ctx->replace_ctx)) 845 return -EINVAL; 846 847 WARN_ON(ctx->replace_ctx->replace_state != 848 IEEE80211_CHANCTX_WILL_BE_REPLACED); 849 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 850 851 ctx->replace_ctx->replace_ctx = NULL; 852 ctx->replace_ctx->replace_state = 853 IEEE80211_CHANCTX_REPLACE_NONE; 854 855 list_del_rcu(&ctx->list); 856 kfree_rcu(ctx, rcu_head); 857 } else { 858 ieee80211_free_chanctx(sdata->local, ctx); 859 } 860 } 861 862 return 0; 863 } 864 865 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 866 const struct cfg80211_chan_def *chandef, 867 enum ieee80211_chanctx_mode mode, 868 bool radar_required) 869 { 870 struct ieee80211_local *local = sdata->local; 871 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 872 873 lockdep_assert_held(&local->chanctx_mtx); 874 875 curr_ctx = ieee80211_vif_get_chanctx(sdata); 876 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 877 return -ENOTSUPP; 878 879 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 880 if (!new_ctx) { 881 if (ieee80211_can_create_new_chanctx(local)) { 882 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 883 if (IS_ERR(new_ctx)) 884 return PTR_ERR(new_ctx); 885 } else { 886 if (!curr_ctx || 887 (curr_ctx->replace_state == 888 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 889 !list_empty(&curr_ctx->reserved_vifs)) { 890 /* 891 * Another vif already requested this context 892 * for a reservation. Find another one hoping 893 * all vifs assigned to it will also switch 894 * soon enough. 895 * 896 * TODO: This needs a little more work as some 897 * cases (more than 2 chanctx capable devices) 898 * may fail which could otherwise succeed 899 * provided some channel context juggling was 900 * performed. 901 * 902 * Consider ctx1..3, vif1..6, each ctx has 2 903 * vifs. vif1 and vif2 from ctx1 request new 904 * different chandefs starting 2 in-place 905 * reserations with ctx4 and ctx5 replacing 906 * ctx1 and ctx2 respectively. Next vif5 and 907 * vif6 from ctx3 reserve ctx4. If vif3 and 908 * vif4 remain on ctx2 as they are then this 909 * fails unless `replace_ctx` from ctx5 is 910 * replaced with ctx3. 911 */ 912 list_for_each_entry(ctx, &local->chanctx_list, 913 list) { 914 if (ctx->replace_state != 915 IEEE80211_CHANCTX_REPLACE_NONE) 916 continue; 917 918 if (!list_empty(&ctx->reserved_vifs)) 919 continue; 920 921 curr_ctx = ctx; 922 break; 923 } 924 } 925 926 /* 927 * If that's true then all available contexts already 928 * have reservations and cannot be used. 929 */ 930 if (!curr_ctx || 931 (curr_ctx->replace_state == 932 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 933 !list_empty(&curr_ctx->reserved_vifs)) 934 return -EBUSY; 935 936 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 937 if (!new_ctx) 938 return -ENOMEM; 939 940 new_ctx->replace_ctx = curr_ctx; 941 new_ctx->replace_state = 942 IEEE80211_CHANCTX_REPLACES_OTHER; 943 944 curr_ctx->replace_ctx = new_ctx; 945 curr_ctx->replace_state = 946 IEEE80211_CHANCTX_WILL_BE_REPLACED; 947 948 list_add_rcu(&new_ctx->list, &local->chanctx_list); 949 } 950 } 951 952 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 953 sdata->reserved_chanctx = new_ctx; 954 sdata->reserved_chandef = *chandef; 955 sdata->reserved_radar_required = radar_required; 956 sdata->reserved_ready = false; 957 958 return 0; 959 } 960 961 static void 962 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 963 { 964 switch (sdata->vif.type) { 965 case NL80211_IFTYPE_ADHOC: 966 case NL80211_IFTYPE_AP: 967 case NL80211_IFTYPE_MESH_POINT: 968 case NL80211_IFTYPE_OCB: 969 ieee80211_queue_work(&sdata->local->hw, 970 &sdata->csa_finalize_work); 971 break; 972 case NL80211_IFTYPE_STATION: 973 ieee80211_queue_work(&sdata->local->hw, 974 &sdata->u.mgd.chswitch_work); 975 break; 976 case NL80211_IFTYPE_UNSPECIFIED: 977 case NL80211_IFTYPE_AP_VLAN: 978 case NL80211_IFTYPE_WDS: 979 case NL80211_IFTYPE_MONITOR: 980 case NL80211_IFTYPE_P2P_CLIENT: 981 case NL80211_IFTYPE_P2P_GO: 982 case NL80211_IFTYPE_P2P_DEVICE: 983 case NUM_NL80211_IFTYPES: 984 WARN_ON(1); 985 break; 986 } 987 } 988 989 static void 990 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 991 const struct cfg80211_chan_def *chandef) 992 { 993 struct ieee80211_sub_if_data *vlan; 994 995 sdata->vif.bss_conf.chandef = *chandef; 996 997 if (sdata->vif.type != NL80211_IFTYPE_AP) 998 return; 999 1000 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1001 vlan->vif.bss_conf.chandef = *chandef; 1002 } 1003 1004 static int 1005 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1006 { 1007 struct ieee80211_local *local = sdata->local; 1008 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1009 struct ieee80211_chanctx *old_ctx, *new_ctx; 1010 const struct cfg80211_chan_def *chandef; 1011 u32 changed = 0; 1012 int err; 1013 1014 lockdep_assert_held(&local->mtx); 1015 lockdep_assert_held(&local->chanctx_mtx); 1016 1017 new_ctx = sdata->reserved_chanctx; 1018 old_ctx = ieee80211_vif_get_chanctx(sdata); 1019 1020 if (WARN_ON(!sdata->reserved_ready)) 1021 return -EBUSY; 1022 1023 if (WARN_ON(!new_ctx)) 1024 return -EINVAL; 1025 1026 if (WARN_ON(!old_ctx)) 1027 return -EINVAL; 1028 1029 if (WARN_ON(new_ctx->replace_state == 1030 IEEE80211_CHANCTX_REPLACES_OTHER)) 1031 return -EINVAL; 1032 1033 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1034 &sdata->reserved_chandef); 1035 if (WARN_ON(!chandef)) 1036 return -EINVAL; 1037 1038 ieee80211_change_chanctx(local, new_ctx, chandef); 1039 1040 vif_chsw[0].vif = &sdata->vif; 1041 vif_chsw[0].old_ctx = &old_ctx->conf; 1042 vif_chsw[0].new_ctx = &new_ctx->conf; 1043 1044 list_del(&sdata->reserved_chanctx_list); 1045 sdata->reserved_chanctx = NULL; 1046 1047 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1048 CHANCTX_SWMODE_REASSIGN_VIF); 1049 if (err) { 1050 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1051 ieee80211_free_chanctx(local, new_ctx); 1052 1053 goto out; 1054 } 1055 1056 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1057 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1058 1059 if (sdata->vif.type == NL80211_IFTYPE_AP) 1060 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1061 1062 ieee80211_check_fast_xmit_iface(sdata); 1063 1064 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1065 ieee80211_free_chanctx(local, old_ctx); 1066 1067 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1068 changed = BSS_CHANGED_BANDWIDTH; 1069 1070 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1071 1072 ieee80211_recalc_smps_chanctx(local, new_ctx); 1073 ieee80211_recalc_radar_chanctx(local, new_ctx); 1074 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1075 1076 if (changed) 1077 ieee80211_bss_info_change_notify(sdata, changed); 1078 1079 out: 1080 ieee80211_vif_chanctx_reservation_complete(sdata); 1081 return err; 1082 } 1083 1084 static int 1085 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1086 { 1087 struct ieee80211_local *local = sdata->local; 1088 struct ieee80211_chanctx *old_ctx, *new_ctx; 1089 const struct cfg80211_chan_def *chandef; 1090 int err; 1091 1092 old_ctx = ieee80211_vif_get_chanctx(sdata); 1093 new_ctx = sdata->reserved_chanctx; 1094 1095 if (WARN_ON(!sdata->reserved_ready)) 1096 return -EINVAL; 1097 1098 if (WARN_ON(old_ctx)) 1099 return -EINVAL; 1100 1101 if (WARN_ON(!new_ctx)) 1102 return -EINVAL; 1103 1104 if (WARN_ON(new_ctx->replace_state == 1105 IEEE80211_CHANCTX_REPLACES_OTHER)) 1106 return -EINVAL; 1107 1108 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1109 &sdata->reserved_chandef); 1110 if (WARN_ON(!chandef)) 1111 return -EINVAL; 1112 1113 ieee80211_change_chanctx(local, new_ctx, chandef); 1114 1115 list_del(&sdata->reserved_chanctx_list); 1116 sdata->reserved_chanctx = NULL; 1117 1118 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1119 if (err) { 1120 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1121 ieee80211_free_chanctx(local, new_ctx); 1122 1123 goto out; 1124 } 1125 1126 out: 1127 ieee80211_vif_chanctx_reservation_complete(sdata); 1128 return err; 1129 } 1130 1131 static bool 1132 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1133 { 1134 struct ieee80211_chanctx *old_ctx, *new_ctx; 1135 1136 lockdep_assert_held(&sdata->local->chanctx_mtx); 1137 1138 new_ctx = sdata->reserved_chanctx; 1139 old_ctx = ieee80211_vif_get_chanctx(sdata); 1140 1141 if (!old_ctx) 1142 return false; 1143 1144 if (WARN_ON(!new_ctx)) 1145 return false; 1146 1147 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1148 return false; 1149 1150 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1151 return false; 1152 1153 return true; 1154 } 1155 1156 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1157 struct ieee80211_chanctx *new_ctx) 1158 { 1159 const struct cfg80211_chan_def *chandef; 1160 1161 lockdep_assert_held(&local->mtx); 1162 lockdep_assert_held(&local->chanctx_mtx); 1163 1164 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1165 if (WARN_ON(!chandef)) 1166 return -EINVAL; 1167 1168 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1169 local->_oper_chandef = *chandef; 1170 ieee80211_hw_config(local, 0); 1171 1172 return 0; 1173 } 1174 1175 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1176 int n_vifs) 1177 { 1178 struct ieee80211_vif_chanctx_switch *vif_chsw; 1179 struct ieee80211_sub_if_data *sdata; 1180 struct ieee80211_chanctx *ctx, *old_ctx; 1181 int i, err; 1182 1183 lockdep_assert_held(&local->mtx); 1184 lockdep_assert_held(&local->chanctx_mtx); 1185 1186 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL); 1187 if (!vif_chsw) 1188 return -ENOMEM; 1189 1190 i = 0; 1191 list_for_each_entry(ctx, &local->chanctx_list, list) { 1192 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1193 continue; 1194 1195 if (WARN_ON(!ctx->replace_ctx)) { 1196 err = -EINVAL; 1197 goto out; 1198 } 1199 1200 list_for_each_entry(sdata, &ctx->reserved_vifs, 1201 reserved_chanctx_list) { 1202 if (!ieee80211_vif_has_in_place_reservation( 1203 sdata)) 1204 continue; 1205 1206 old_ctx = ieee80211_vif_get_chanctx(sdata); 1207 vif_chsw[i].vif = &sdata->vif; 1208 vif_chsw[i].old_ctx = &old_ctx->conf; 1209 vif_chsw[i].new_ctx = &ctx->conf; 1210 1211 i++; 1212 } 1213 } 1214 1215 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1216 CHANCTX_SWMODE_SWAP_CONTEXTS); 1217 1218 out: 1219 kfree(vif_chsw); 1220 return err; 1221 } 1222 1223 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1224 { 1225 struct ieee80211_chanctx *ctx; 1226 int err; 1227 1228 lockdep_assert_held(&local->mtx); 1229 lockdep_assert_held(&local->chanctx_mtx); 1230 1231 list_for_each_entry(ctx, &local->chanctx_list, list) { 1232 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1233 continue; 1234 1235 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1236 continue; 1237 1238 ieee80211_del_chanctx(local, ctx->replace_ctx); 1239 err = ieee80211_add_chanctx(local, ctx); 1240 if (err) 1241 goto err; 1242 } 1243 1244 return 0; 1245 1246 err: 1247 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1248 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1249 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1250 continue; 1251 1252 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1253 continue; 1254 1255 ieee80211_del_chanctx(local, ctx); 1256 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1257 } 1258 1259 return err; 1260 } 1261 1262 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1263 { 1264 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1265 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1266 struct ieee80211_chanctx *new_ctx = NULL; 1267 int i, err, n_assigned, n_reserved, n_ready; 1268 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1269 1270 lockdep_assert_held(&local->mtx); 1271 lockdep_assert_held(&local->chanctx_mtx); 1272 1273 /* 1274 * If there are 2 independent pairs of channel contexts performing 1275 * cross-switch of their vifs this code will still wait until both are 1276 * ready even though it could be possible to switch one before the 1277 * other is ready. 1278 * 1279 * For practical reasons and code simplicity just do a single huge 1280 * switch. 1281 */ 1282 1283 /* 1284 * Verify if the reservation is still feasible. 1285 * - if it's not then disconnect 1286 * - if it is but not all vifs necessary are ready then defer 1287 */ 1288 1289 list_for_each_entry(ctx, &local->chanctx_list, list) { 1290 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1291 continue; 1292 1293 if (WARN_ON(!ctx->replace_ctx)) { 1294 err = -EINVAL; 1295 goto err; 1296 } 1297 1298 if (!local->use_chanctx) 1299 new_ctx = ctx; 1300 1301 n_ctx++; 1302 1303 n_assigned = 0; 1304 n_reserved = 0; 1305 n_ready = 0; 1306 1307 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1308 assigned_chanctx_list) { 1309 n_assigned++; 1310 if (sdata->reserved_chanctx) { 1311 n_reserved++; 1312 if (sdata->reserved_ready) 1313 n_ready++; 1314 } 1315 } 1316 1317 if (n_assigned != n_reserved) { 1318 if (n_ready == n_reserved) { 1319 wiphy_info(local->hw.wiphy, 1320 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1321 err = -EBUSY; 1322 goto err; 1323 } 1324 1325 return -EAGAIN; 1326 } 1327 1328 ctx->conf.radar_enabled = false; 1329 list_for_each_entry(sdata, &ctx->reserved_vifs, 1330 reserved_chanctx_list) { 1331 if (ieee80211_vif_has_in_place_reservation(sdata) && 1332 !sdata->reserved_ready) 1333 return -EAGAIN; 1334 1335 old_ctx = ieee80211_vif_get_chanctx(sdata); 1336 if (old_ctx) { 1337 if (old_ctx->replace_state == 1338 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1339 n_vifs_switch++; 1340 else 1341 n_vifs_assign++; 1342 } else { 1343 n_vifs_ctxless++; 1344 } 1345 1346 if (sdata->reserved_radar_required) 1347 ctx->conf.radar_enabled = true; 1348 } 1349 } 1350 1351 if (WARN_ON(n_ctx == 0) || 1352 WARN_ON(n_vifs_switch == 0 && 1353 n_vifs_assign == 0 && 1354 n_vifs_ctxless == 0) || 1355 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1356 WARN_ON(!new_ctx && !local->use_chanctx)) { 1357 err = -EINVAL; 1358 goto err; 1359 } 1360 1361 /* 1362 * All necessary vifs are ready. Perform the switch now depending on 1363 * reservations and driver capabilities. 1364 */ 1365 1366 if (local->use_chanctx) { 1367 if (n_vifs_switch > 0) { 1368 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1369 if (err) 1370 goto err; 1371 } 1372 1373 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1374 err = ieee80211_chsw_switch_ctxs(local); 1375 if (err) 1376 goto err; 1377 } 1378 } else { 1379 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1380 if (err) 1381 goto err; 1382 } 1383 1384 /* 1385 * Update all structures, values and pointers to point to new channel 1386 * context(s). 1387 */ 1388 1389 i = 0; 1390 list_for_each_entry(ctx, &local->chanctx_list, list) { 1391 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1392 continue; 1393 1394 if (WARN_ON(!ctx->replace_ctx)) { 1395 err = -EINVAL; 1396 goto err; 1397 } 1398 1399 list_for_each_entry(sdata, &ctx->reserved_vifs, 1400 reserved_chanctx_list) { 1401 u32 changed = 0; 1402 1403 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1404 continue; 1405 1406 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1407 1408 if (sdata->vif.type == NL80211_IFTYPE_AP) 1409 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1410 false); 1411 1412 ieee80211_check_fast_xmit_iface(sdata); 1413 1414 sdata->radar_required = sdata->reserved_radar_required; 1415 1416 if (sdata->vif.bss_conf.chandef.width != 1417 sdata->reserved_chandef.width) 1418 changed = BSS_CHANGED_BANDWIDTH; 1419 1420 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1421 if (changed) 1422 ieee80211_bss_info_change_notify(sdata, 1423 changed); 1424 1425 ieee80211_recalc_txpower(sdata, false); 1426 } 1427 1428 ieee80211_recalc_chanctx_chantype(local, ctx); 1429 ieee80211_recalc_smps_chanctx(local, ctx); 1430 ieee80211_recalc_radar_chanctx(local, ctx); 1431 ieee80211_recalc_chanctx_min_def(local, ctx); 1432 1433 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1434 reserved_chanctx_list) { 1435 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1436 continue; 1437 1438 list_del(&sdata->reserved_chanctx_list); 1439 list_move(&sdata->assigned_chanctx_list, 1440 &ctx->assigned_vifs); 1441 sdata->reserved_chanctx = NULL; 1442 1443 ieee80211_vif_chanctx_reservation_complete(sdata); 1444 } 1445 1446 /* 1447 * This context might have been a dependency for an already 1448 * ready re-assign reservation interface that was deferred. Do 1449 * not propagate error to the caller though. The in-place 1450 * reservation for originally requested interface has already 1451 * succeeded at this point. 1452 */ 1453 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1454 reserved_chanctx_list) { 1455 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1456 sdata))) 1457 continue; 1458 1459 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1460 continue; 1461 1462 if (!sdata->reserved_ready) 1463 continue; 1464 1465 if (ieee80211_vif_get_chanctx(sdata)) 1466 err = ieee80211_vif_use_reserved_reassign( 1467 sdata); 1468 else 1469 err = ieee80211_vif_use_reserved_assign(sdata); 1470 1471 if (err) { 1472 sdata_info(sdata, 1473 "failed to finalize (re-)assign reservation (err=%d)\n", 1474 err); 1475 ieee80211_vif_unreserve_chanctx(sdata); 1476 cfg80211_stop_iface(local->hw.wiphy, 1477 &sdata->wdev, 1478 GFP_KERNEL); 1479 } 1480 } 1481 } 1482 1483 /* 1484 * Finally free old contexts 1485 */ 1486 1487 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1488 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1489 continue; 1490 1491 ctx->replace_ctx->replace_ctx = NULL; 1492 ctx->replace_ctx->replace_state = 1493 IEEE80211_CHANCTX_REPLACE_NONE; 1494 1495 list_del_rcu(&ctx->list); 1496 kfree_rcu(ctx, rcu_head); 1497 } 1498 1499 return 0; 1500 1501 err: 1502 list_for_each_entry(ctx, &local->chanctx_list, list) { 1503 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1504 continue; 1505 1506 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1507 reserved_chanctx_list) { 1508 ieee80211_vif_unreserve_chanctx(sdata); 1509 ieee80211_vif_chanctx_reservation_complete(sdata); 1510 } 1511 } 1512 1513 return err; 1514 } 1515 1516 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1517 { 1518 struct ieee80211_local *local = sdata->local; 1519 struct ieee80211_chanctx_conf *conf; 1520 struct ieee80211_chanctx *ctx; 1521 bool use_reserved_switch = false; 1522 1523 lockdep_assert_held(&local->chanctx_mtx); 1524 1525 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1526 lockdep_is_held(&local->chanctx_mtx)); 1527 if (!conf) 1528 return; 1529 1530 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1531 1532 if (sdata->reserved_chanctx) { 1533 if (sdata->reserved_chanctx->replace_state == 1534 IEEE80211_CHANCTX_REPLACES_OTHER && 1535 ieee80211_chanctx_num_reserved(local, 1536 sdata->reserved_chanctx) > 1) 1537 use_reserved_switch = true; 1538 1539 ieee80211_vif_unreserve_chanctx(sdata); 1540 } 1541 1542 ieee80211_assign_vif_chanctx(sdata, NULL); 1543 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1544 ieee80211_free_chanctx(local, ctx); 1545 1546 sdata->radar_required = false; 1547 1548 /* Unreserving may ready an in-place reservation. */ 1549 if (use_reserved_switch) 1550 ieee80211_vif_use_reserved_switch(local); 1551 } 1552 1553 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1554 const struct cfg80211_chan_def *chandef, 1555 enum ieee80211_chanctx_mode mode) 1556 { 1557 struct ieee80211_local *local = sdata->local; 1558 struct ieee80211_chanctx *ctx; 1559 u8 radar_detect_width = 0; 1560 int ret; 1561 1562 lockdep_assert_held(&local->mtx); 1563 1564 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1565 1566 mutex_lock(&local->chanctx_mtx); 1567 1568 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1569 chandef, 1570 sdata->wdev.iftype); 1571 if (ret < 0) 1572 goto out; 1573 if (ret > 0) 1574 radar_detect_width = BIT(chandef->width); 1575 1576 sdata->radar_required = ret; 1577 1578 ret = ieee80211_check_combinations(sdata, chandef, mode, 1579 radar_detect_width); 1580 if (ret < 0) 1581 goto out; 1582 1583 __ieee80211_vif_release_channel(sdata); 1584 1585 ctx = ieee80211_find_chanctx(local, chandef, mode); 1586 if (!ctx) 1587 ctx = ieee80211_new_chanctx(local, chandef, mode); 1588 if (IS_ERR(ctx)) { 1589 ret = PTR_ERR(ctx); 1590 goto out; 1591 } 1592 1593 ieee80211_vif_update_chandef(sdata, chandef); 1594 1595 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1596 if (ret) { 1597 /* if assign fails refcount stays the same */ 1598 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1599 ieee80211_free_chanctx(local, ctx); 1600 goto out; 1601 } 1602 1603 ieee80211_recalc_smps_chanctx(local, ctx); 1604 ieee80211_recalc_radar_chanctx(local, ctx); 1605 out: 1606 if (ret) 1607 sdata->radar_required = false; 1608 1609 mutex_unlock(&local->chanctx_mtx); 1610 return ret; 1611 } 1612 1613 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1614 { 1615 struct ieee80211_local *local = sdata->local; 1616 struct ieee80211_chanctx *new_ctx; 1617 struct ieee80211_chanctx *old_ctx; 1618 int err; 1619 1620 lockdep_assert_held(&local->mtx); 1621 lockdep_assert_held(&local->chanctx_mtx); 1622 1623 new_ctx = sdata->reserved_chanctx; 1624 old_ctx = ieee80211_vif_get_chanctx(sdata); 1625 1626 if (WARN_ON(!new_ctx)) 1627 return -EINVAL; 1628 1629 if (WARN_ON(new_ctx->replace_state == 1630 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1631 return -EINVAL; 1632 1633 if (WARN_ON(sdata->reserved_ready)) 1634 return -EINVAL; 1635 1636 sdata->reserved_ready = true; 1637 1638 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1639 if (old_ctx) 1640 err = ieee80211_vif_use_reserved_reassign(sdata); 1641 else 1642 err = ieee80211_vif_use_reserved_assign(sdata); 1643 1644 if (err) 1645 return err; 1646 } 1647 1648 /* 1649 * In-place reservation may need to be finalized now either if: 1650 * a) sdata is taking part in the swapping itself and is the last one 1651 * b) sdata has switched with a re-assign reservation to an existing 1652 * context readying in-place switching of old_ctx 1653 * 1654 * In case of (b) do not propagate the error up because the requested 1655 * sdata already switched successfully. Just spill an extra warning. 1656 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1657 * interfaces upon failure. 1658 */ 1659 if ((old_ctx && 1660 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1661 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1662 err = ieee80211_vif_use_reserved_switch(local); 1663 if (err && err != -EAGAIN) { 1664 if (new_ctx->replace_state == 1665 IEEE80211_CHANCTX_REPLACES_OTHER) 1666 return err; 1667 1668 wiphy_info(local->hw.wiphy, 1669 "depending in-place reservation failed (err=%d)\n", 1670 err); 1671 } 1672 } 1673 1674 return 0; 1675 } 1676 1677 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 1678 const struct cfg80211_chan_def *chandef, 1679 u32 *changed) 1680 { 1681 struct ieee80211_local *local = sdata->local; 1682 struct ieee80211_chanctx_conf *conf; 1683 struct ieee80211_chanctx *ctx; 1684 const struct cfg80211_chan_def *compat; 1685 int ret; 1686 1687 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1688 IEEE80211_CHAN_DISABLED)) 1689 return -EINVAL; 1690 1691 mutex_lock(&local->chanctx_mtx); 1692 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { 1693 ret = 0; 1694 goto out; 1695 } 1696 1697 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1698 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { 1699 ret = -EINVAL; 1700 goto out; 1701 } 1702 1703 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1704 lockdep_is_held(&local->chanctx_mtx)); 1705 if (!conf) { 1706 ret = -EINVAL; 1707 goto out; 1708 } 1709 1710 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1711 1712 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1713 if (!compat) { 1714 ret = -EINVAL; 1715 goto out; 1716 } 1717 1718 switch (ctx->replace_state) { 1719 case IEEE80211_CHANCTX_REPLACE_NONE: 1720 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) { 1721 ret = -EBUSY; 1722 goto out; 1723 } 1724 break; 1725 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1726 /* TODO: Perhaps the bandwidth change could be treated as a 1727 * reservation itself? */ 1728 ret = -EBUSY; 1729 goto out; 1730 case IEEE80211_CHANCTX_REPLACES_OTHER: 1731 /* channel context that is going to replace another channel 1732 * context doesn't really exist and shouldn't be assigned 1733 * anywhere yet */ 1734 WARN_ON(1); 1735 break; 1736 } 1737 1738 ieee80211_vif_update_chandef(sdata, chandef); 1739 1740 ieee80211_recalc_chanctx_chantype(local, ctx); 1741 1742 *changed |= BSS_CHANGED_BANDWIDTH; 1743 ret = 0; 1744 out: 1745 mutex_unlock(&local->chanctx_mtx); 1746 return ret; 1747 } 1748 1749 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1750 { 1751 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1752 1753 lockdep_assert_held(&sdata->local->mtx); 1754 1755 mutex_lock(&sdata->local->chanctx_mtx); 1756 __ieee80211_vif_release_channel(sdata); 1757 mutex_unlock(&sdata->local->chanctx_mtx); 1758 } 1759 1760 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) 1761 { 1762 struct ieee80211_local *local = sdata->local; 1763 struct ieee80211_sub_if_data *ap; 1764 struct ieee80211_chanctx_conf *conf; 1765 1766 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 1767 return; 1768 1769 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1770 1771 mutex_lock(&local->chanctx_mtx); 1772 1773 conf = rcu_dereference_protected(ap->vif.chanctx_conf, 1774 lockdep_is_held(&local->chanctx_mtx)); 1775 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 1776 mutex_unlock(&local->chanctx_mtx); 1777 } 1778 1779 void ieee80211_iter_chan_contexts_atomic( 1780 struct ieee80211_hw *hw, 1781 void (*iter)(struct ieee80211_hw *hw, 1782 struct ieee80211_chanctx_conf *chanctx_conf, 1783 void *data), 1784 void *iter_data) 1785 { 1786 struct ieee80211_local *local = hw_to_local(hw); 1787 struct ieee80211_chanctx *ctx; 1788 1789 rcu_read_lock(); 1790 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 1791 if (ctx->driver_present) 1792 iter(hw, &ctx->conf, iter_data); 1793 rcu_read_unlock(); 1794 } 1795 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 1796