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 static 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) 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_P2P_DEVICE: 268 continue; 269 case NL80211_IFTYPE_STATION: 270 case NL80211_IFTYPE_ADHOC: 271 case NL80211_IFTYPE_WDS: 272 case NL80211_IFTYPE_MESH_POINT: 273 case NL80211_IFTYPE_OCB: 274 width = vif->bss_conf.chandef.width; 275 break; 276 case NL80211_IFTYPE_UNSPECIFIED: 277 case NUM_NL80211_IFTYPES: 278 case NL80211_IFTYPE_MONITOR: 279 case NL80211_IFTYPE_P2P_CLIENT: 280 case NL80211_IFTYPE_P2P_GO: 281 WARN_ON_ONCE(1); 282 } 283 max_bw = max(max_bw, width); 284 } 285 286 /* use the configured bandwidth in case of monitor interface */ 287 sdata = rcu_dereference(local->monitor_sdata); 288 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 289 max_bw = max(max_bw, conf->def.width); 290 291 rcu_read_unlock(); 292 293 return max_bw; 294 } 295 296 /* 297 * recalc the min required chan width of the channel context, which is 298 * the max of min required widths of all the interfaces bound to this 299 * channel context. 300 */ 301 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 302 struct ieee80211_chanctx *ctx) 303 { 304 enum nl80211_chan_width max_bw; 305 struct cfg80211_chan_def min_def; 306 307 lockdep_assert_held(&local->chanctx_mtx); 308 309 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */ 310 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 311 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 312 ctx->conf.radar_enabled) { 313 ctx->conf.min_def = ctx->conf.def; 314 return; 315 } 316 317 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 318 319 /* downgrade chandef up to max_bw */ 320 min_def = ctx->conf.def; 321 while (min_def.width > max_bw) 322 ieee80211_chandef_downgrade(&min_def); 323 324 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 325 return; 326 327 ctx->conf.min_def = min_def; 328 if (!ctx->driver_present) 329 return; 330 331 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH); 332 } 333 334 static void ieee80211_change_chanctx(struct ieee80211_local *local, 335 struct ieee80211_chanctx *ctx, 336 const struct cfg80211_chan_def *chandef) 337 { 338 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) 339 return; 340 341 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 342 343 ctx->conf.def = *chandef; 344 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); 345 ieee80211_recalc_chanctx_min_def(local, ctx); 346 347 if (!local->use_chanctx) { 348 local->_oper_chandef = *chandef; 349 ieee80211_hw_config(local, 0); 350 } 351 } 352 353 static struct ieee80211_chanctx * 354 ieee80211_find_chanctx(struct ieee80211_local *local, 355 const struct cfg80211_chan_def *chandef, 356 enum ieee80211_chanctx_mode mode) 357 { 358 struct ieee80211_chanctx *ctx; 359 360 lockdep_assert_held(&local->chanctx_mtx); 361 362 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 363 return NULL; 364 365 list_for_each_entry(ctx, &local->chanctx_list, list) { 366 const struct cfg80211_chan_def *compat; 367 368 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 369 continue; 370 371 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 372 continue; 373 374 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 375 if (!compat) 376 continue; 377 378 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 379 compat); 380 if (!compat) 381 continue; 382 383 ieee80211_change_chanctx(local, ctx, compat); 384 385 return ctx; 386 } 387 388 return NULL; 389 } 390 391 bool ieee80211_is_radar_required(struct ieee80211_local *local) 392 { 393 struct ieee80211_sub_if_data *sdata; 394 395 lockdep_assert_held(&local->mtx); 396 397 rcu_read_lock(); 398 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 399 if (sdata->radar_required) { 400 rcu_read_unlock(); 401 return true; 402 } 403 } 404 rcu_read_unlock(); 405 406 return false; 407 } 408 409 static bool 410 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 411 struct ieee80211_chanctx *ctx) 412 { 413 struct ieee80211_chanctx_conf *conf = &ctx->conf; 414 struct ieee80211_sub_if_data *sdata; 415 bool required = false; 416 417 lockdep_assert_held(&local->chanctx_mtx); 418 lockdep_assert_held(&local->mtx); 419 420 rcu_read_lock(); 421 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 422 if (!ieee80211_sdata_running(sdata)) 423 continue; 424 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 425 continue; 426 if (!sdata->radar_required) 427 continue; 428 429 required = true; 430 break; 431 } 432 rcu_read_unlock(); 433 434 return required; 435 } 436 437 static struct ieee80211_chanctx * 438 ieee80211_alloc_chanctx(struct ieee80211_local *local, 439 const struct cfg80211_chan_def *chandef, 440 enum ieee80211_chanctx_mode mode) 441 { 442 struct ieee80211_chanctx *ctx; 443 444 lockdep_assert_held(&local->chanctx_mtx); 445 446 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 447 if (!ctx) 448 return NULL; 449 450 INIT_LIST_HEAD(&ctx->assigned_vifs); 451 INIT_LIST_HEAD(&ctx->reserved_vifs); 452 ctx->conf.def = *chandef; 453 ctx->conf.rx_chains_static = 1; 454 ctx->conf.rx_chains_dynamic = 1; 455 ctx->mode = mode; 456 ctx->conf.radar_enabled = false; 457 ieee80211_recalc_chanctx_min_def(local, ctx); 458 459 return ctx; 460 } 461 462 static int ieee80211_add_chanctx(struct ieee80211_local *local, 463 struct ieee80211_chanctx *ctx) 464 { 465 u32 changed; 466 int err; 467 468 lockdep_assert_held(&local->mtx); 469 lockdep_assert_held(&local->chanctx_mtx); 470 471 if (!local->use_chanctx) 472 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 473 474 /* turn idle off *before* setting channel -- some drivers need that */ 475 changed = ieee80211_idle_off(local); 476 if (changed) 477 ieee80211_hw_config(local, changed); 478 479 if (!local->use_chanctx) { 480 local->_oper_chandef = ctx->conf.def; 481 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 482 } else { 483 err = drv_add_chanctx(local, ctx); 484 if (err) { 485 ieee80211_recalc_idle(local); 486 return err; 487 } 488 } 489 490 return 0; 491 } 492 493 static struct ieee80211_chanctx * 494 ieee80211_new_chanctx(struct ieee80211_local *local, 495 const struct cfg80211_chan_def *chandef, 496 enum ieee80211_chanctx_mode mode) 497 { 498 struct ieee80211_chanctx *ctx; 499 int err; 500 501 lockdep_assert_held(&local->mtx); 502 lockdep_assert_held(&local->chanctx_mtx); 503 504 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 505 if (!ctx) 506 return ERR_PTR(-ENOMEM); 507 508 err = ieee80211_add_chanctx(local, ctx); 509 if (err) { 510 kfree(ctx); 511 return ERR_PTR(err); 512 } 513 514 list_add_rcu(&ctx->list, &local->chanctx_list); 515 return ctx; 516 } 517 518 static void ieee80211_del_chanctx(struct ieee80211_local *local, 519 struct ieee80211_chanctx *ctx) 520 { 521 lockdep_assert_held(&local->chanctx_mtx); 522 523 if (!local->use_chanctx) { 524 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 525 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 526 chandef->center_freq1 = chandef->chan->center_freq; 527 chandef->center_freq2 = 0; 528 529 /* NOTE: Disabling radar is only valid here for 530 * single channel context. To be sure, check it ... 531 */ 532 WARN_ON(local->hw.conf.radar_enabled && 533 !list_empty(&local->chanctx_list)); 534 535 local->hw.conf.radar_enabled = false; 536 537 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 538 } else { 539 drv_remove_chanctx(local, ctx); 540 } 541 542 ieee80211_recalc_idle(local); 543 } 544 545 static void ieee80211_free_chanctx(struct ieee80211_local *local, 546 struct ieee80211_chanctx *ctx) 547 { 548 lockdep_assert_held(&local->chanctx_mtx); 549 550 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 551 552 list_del_rcu(&ctx->list); 553 ieee80211_del_chanctx(local, ctx); 554 kfree_rcu(ctx, rcu_head); 555 } 556 557 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 558 struct ieee80211_chanctx *ctx) 559 { 560 struct ieee80211_chanctx_conf *conf = &ctx->conf; 561 struct ieee80211_sub_if_data *sdata; 562 const struct cfg80211_chan_def *compat = NULL; 563 564 lockdep_assert_held(&local->chanctx_mtx); 565 566 rcu_read_lock(); 567 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 568 569 if (!ieee80211_sdata_running(sdata)) 570 continue; 571 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 572 continue; 573 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 574 continue; 575 576 if (!compat) 577 compat = &sdata->vif.bss_conf.chandef; 578 579 compat = cfg80211_chandef_compatible( 580 &sdata->vif.bss_conf.chandef, compat); 581 if (WARN_ON_ONCE(!compat)) 582 break; 583 } 584 rcu_read_unlock(); 585 586 if (!compat) 587 return; 588 589 ieee80211_change_chanctx(local, ctx, compat); 590 } 591 592 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 593 struct ieee80211_chanctx *chanctx) 594 { 595 bool radar_enabled; 596 597 lockdep_assert_held(&local->chanctx_mtx); 598 /* for ieee80211_is_radar_required */ 599 lockdep_assert_held(&local->mtx); 600 601 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 602 603 if (radar_enabled == chanctx->conf.radar_enabled) 604 return; 605 606 chanctx->conf.radar_enabled = radar_enabled; 607 608 if (!local->use_chanctx) { 609 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 610 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 611 } 612 613 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 614 } 615 616 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 617 struct ieee80211_chanctx *new_ctx) 618 { 619 struct ieee80211_local *local = sdata->local; 620 struct ieee80211_chanctx_conf *conf; 621 struct ieee80211_chanctx *curr_ctx = NULL; 622 int ret = 0; 623 624 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 625 lockdep_is_held(&local->chanctx_mtx)); 626 627 if (conf) { 628 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 629 630 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 631 conf = NULL; 632 list_del(&sdata->assigned_chanctx_list); 633 } 634 635 if (new_ctx) { 636 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 637 if (ret) 638 goto out; 639 640 conf = &new_ctx->conf; 641 list_add(&sdata->assigned_chanctx_list, 642 &new_ctx->assigned_vifs); 643 } 644 645 out: 646 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 647 648 sdata->vif.bss_conf.idle = !conf; 649 650 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 651 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 652 ieee80211_recalc_smps_chanctx(local, curr_ctx); 653 ieee80211_recalc_radar_chanctx(local, curr_ctx); 654 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 655 } 656 657 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 658 ieee80211_recalc_txpower(sdata, false); 659 ieee80211_recalc_chanctx_min_def(local, new_ctx); 660 } 661 662 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 663 sdata->vif.type != NL80211_IFTYPE_MONITOR) 664 ieee80211_bss_info_change_notify(sdata, 665 BSS_CHANGED_IDLE); 666 667 return ret; 668 } 669 670 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 671 struct ieee80211_chanctx *chanctx) 672 { 673 struct ieee80211_sub_if_data *sdata; 674 u8 rx_chains_static, rx_chains_dynamic; 675 676 lockdep_assert_held(&local->chanctx_mtx); 677 678 rx_chains_static = 1; 679 rx_chains_dynamic = 1; 680 681 rcu_read_lock(); 682 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 683 u8 needed_static, needed_dynamic; 684 685 if (!ieee80211_sdata_running(sdata)) 686 continue; 687 688 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 689 &chanctx->conf) 690 continue; 691 692 switch (sdata->vif.type) { 693 case NL80211_IFTYPE_P2P_DEVICE: 694 continue; 695 case NL80211_IFTYPE_STATION: 696 if (!sdata->u.mgd.associated) 697 continue; 698 break; 699 case NL80211_IFTYPE_AP_VLAN: 700 continue; 701 case NL80211_IFTYPE_AP: 702 case NL80211_IFTYPE_ADHOC: 703 case NL80211_IFTYPE_WDS: 704 case NL80211_IFTYPE_MESH_POINT: 705 case NL80211_IFTYPE_OCB: 706 break; 707 default: 708 WARN_ON_ONCE(1); 709 } 710 711 switch (sdata->smps_mode) { 712 default: 713 WARN_ONCE(1, "Invalid SMPS mode %d\n", 714 sdata->smps_mode); 715 /* fall through */ 716 case IEEE80211_SMPS_OFF: 717 needed_static = sdata->needed_rx_chains; 718 needed_dynamic = sdata->needed_rx_chains; 719 break; 720 case IEEE80211_SMPS_DYNAMIC: 721 needed_static = 1; 722 needed_dynamic = sdata->needed_rx_chains; 723 break; 724 case IEEE80211_SMPS_STATIC: 725 needed_static = 1; 726 needed_dynamic = 1; 727 break; 728 } 729 730 rx_chains_static = max(rx_chains_static, needed_static); 731 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 732 } 733 734 /* Disable SMPS for the monitor interface */ 735 sdata = rcu_dereference(local->monitor_sdata); 736 if (sdata && 737 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 738 rx_chains_dynamic = rx_chains_static = local->rx_chains; 739 740 rcu_read_unlock(); 741 742 if (!local->use_chanctx) { 743 if (rx_chains_static > 1) 744 local->smps_mode = IEEE80211_SMPS_OFF; 745 else if (rx_chains_dynamic > 1) 746 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 747 else 748 local->smps_mode = IEEE80211_SMPS_STATIC; 749 ieee80211_hw_config(local, 0); 750 } 751 752 if (rx_chains_static == chanctx->conf.rx_chains_static && 753 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 754 return; 755 756 chanctx->conf.rx_chains_static = rx_chains_static; 757 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 758 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 759 } 760 761 static void 762 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 763 bool clear) 764 { 765 struct ieee80211_local *local __maybe_unused = sdata->local; 766 struct ieee80211_sub_if_data *vlan; 767 struct ieee80211_chanctx_conf *conf; 768 769 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 770 return; 771 772 lockdep_assert_held(&local->mtx); 773 774 /* Check that conf exists, even when clearing this function 775 * must be called with the AP's channel context still there 776 * as it would otherwise cause VLANs to have an invalid 777 * channel context pointer for a while, possibly pointing 778 * to a channel context that has already been freed. 779 */ 780 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 781 lockdep_is_held(&local->chanctx_mtx)); 782 WARN_ON(!conf); 783 784 if (clear) 785 conf = NULL; 786 787 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 788 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 789 } 790 791 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 792 bool clear) 793 { 794 struct ieee80211_local *local = sdata->local; 795 796 mutex_lock(&local->chanctx_mtx); 797 798 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 799 800 mutex_unlock(&local->chanctx_mtx); 801 } 802 803 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 804 { 805 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 806 807 lockdep_assert_held(&sdata->local->chanctx_mtx); 808 809 if (WARN_ON(!ctx)) 810 return -EINVAL; 811 812 list_del(&sdata->reserved_chanctx_list); 813 sdata->reserved_chanctx = NULL; 814 815 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 816 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 817 if (WARN_ON(!ctx->replace_ctx)) 818 return -EINVAL; 819 820 WARN_ON(ctx->replace_ctx->replace_state != 821 IEEE80211_CHANCTX_WILL_BE_REPLACED); 822 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 823 824 ctx->replace_ctx->replace_ctx = NULL; 825 ctx->replace_ctx->replace_state = 826 IEEE80211_CHANCTX_REPLACE_NONE; 827 828 list_del_rcu(&ctx->list); 829 kfree_rcu(ctx, rcu_head); 830 } else { 831 ieee80211_free_chanctx(sdata->local, ctx); 832 } 833 } 834 835 return 0; 836 } 837 838 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 839 const struct cfg80211_chan_def *chandef, 840 enum ieee80211_chanctx_mode mode, 841 bool radar_required) 842 { 843 struct ieee80211_local *local = sdata->local; 844 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 845 846 lockdep_assert_held(&local->chanctx_mtx); 847 848 curr_ctx = ieee80211_vif_get_chanctx(sdata); 849 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 850 return -ENOTSUPP; 851 852 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 853 if (!new_ctx) { 854 if (ieee80211_can_create_new_chanctx(local)) { 855 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 856 if (IS_ERR(new_ctx)) 857 return PTR_ERR(new_ctx); 858 } else { 859 if (!curr_ctx || 860 (curr_ctx->replace_state == 861 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 862 !list_empty(&curr_ctx->reserved_vifs)) { 863 /* 864 * Another vif already requested this context 865 * for a reservation. Find another one hoping 866 * all vifs assigned to it will also switch 867 * soon enough. 868 * 869 * TODO: This needs a little more work as some 870 * cases (more than 2 chanctx capable devices) 871 * may fail which could otherwise succeed 872 * provided some channel context juggling was 873 * performed. 874 * 875 * Consider ctx1..3, vif1..6, each ctx has 2 876 * vifs. vif1 and vif2 from ctx1 request new 877 * different chandefs starting 2 in-place 878 * reserations with ctx4 and ctx5 replacing 879 * ctx1 and ctx2 respectively. Next vif5 and 880 * vif6 from ctx3 reserve ctx4. If vif3 and 881 * vif4 remain on ctx2 as they are then this 882 * fails unless `replace_ctx` from ctx5 is 883 * replaced with ctx3. 884 */ 885 list_for_each_entry(ctx, &local->chanctx_list, 886 list) { 887 if (ctx->replace_state != 888 IEEE80211_CHANCTX_REPLACE_NONE) 889 continue; 890 891 if (!list_empty(&ctx->reserved_vifs)) 892 continue; 893 894 curr_ctx = ctx; 895 break; 896 } 897 } 898 899 /* 900 * If that's true then all available contexts already 901 * have reservations and cannot be used. 902 */ 903 if (!curr_ctx || 904 (curr_ctx->replace_state == 905 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 906 !list_empty(&curr_ctx->reserved_vifs)) 907 return -EBUSY; 908 909 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 910 if (!new_ctx) 911 return -ENOMEM; 912 913 new_ctx->replace_ctx = curr_ctx; 914 new_ctx->replace_state = 915 IEEE80211_CHANCTX_REPLACES_OTHER; 916 917 curr_ctx->replace_ctx = new_ctx; 918 curr_ctx->replace_state = 919 IEEE80211_CHANCTX_WILL_BE_REPLACED; 920 921 list_add_rcu(&new_ctx->list, &local->chanctx_list); 922 } 923 } 924 925 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 926 sdata->reserved_chanctx = new_ctx; 927 sdata->reserved_chandef = *chandef; 928 sdata->reserved_radar_required = radar_required; 929 sdata->reserved_ready = false; 930 931 return 0; 932 } 933 934 static void 935 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 936 { 937 switch (sdata->vif.type) { 938 case NL80211_IFTYPE_ADHOC: 939 case NL80211_IFTYPE_AP: 940 case NL80211_IFTYPE_MESH_POINT: 941 case NL80211_IFTYPE_OCB: 942 ieee80211_queue_work(&sdata->local->hw, 943 &sdata->csa_finalize_work); 944 break; 945 case NL80211_IFTYPE_STATION: 946 ieee80211_queue_work(&sdata->local->hw, 947 &sdata->u.mgd.chswitch_work); 948 break; 949 case NL80211_IFTYPE_UNSPECIFIED: 950 case NL80211_IFTYPE_AP_VLAN: 951 case NL80211_IFTYPE_WDS: 952 case NL80211_IFTYPE_MONITOR: 953 case NL80211_IFTYPE_P2P_CLIENT: 954 case NL80211_IFTYPE_P2P_GO: 955 case NL80211_IFTYPE_P2P_DEVICE: 956 case NUM_NL80211_IFTYPES: 957 WARN_ON(1); 958 break; 959 } 960 } 961 962 static void 963 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 964 const struct cfg80211_chan_def *chandef) 965 { 966 struct ieee80211_sub_if_data *vlan; 967 968 sdata->vif.bss_conf.chandef = *chandef; 969 970 if (sdata->vif.type != NL80211_IFTYPE_AP) 971 return; 972 973 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 974 vlan->vif.bss_conf.chandef = *chandef; 975 } 976 977 static int 978 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 979 { 980 struct ieee80211_local *local = sdata->local; 981 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 982 struct ieee80211_chanctx *old_ctx, *new_ctx; 983 const struct cfg80211_chan_def *chandef; 984 u32 changed = 0; 985 int err; 986 987 lockdep_assert_held(&local->mtx); 988 lockdep_assert_held(&local->chanctx_mtx); 989 990 new_ctx = sdata->reserved_chanctx; 991 old_ctx = ieee80211_vif_get_chanctx(sdata); 992 993 if (WARN_ON(!sdata->reserved_ready)) 994 return -EBUSY; 995 996 if (WARN_ON(!new_ctx)) 997 return -EINVAL; 998 999 if (WARN_ON(!old_ctx)) 1000 return -EINVAL; 1001 1002 if (WARN_ON(new_ctx->replace_state == 1003 IEEE80211_CHANCTX_REPLACES_OTHER)) 1004 return -EINVAL; 1005 1006 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1007 &sdata->reserved_chandef); 1008 if (WARN_ON(!chandef)) 1009 return -EINVAL; 1010 1011 vif_chsw[0].vif = &sdata->vif; 1012 vif_chsw[0].old_ctx = &old_ctx->conf; 1013 vif_chsw[0].new_ctx = &new_ctx->conf; 1014 1015 list_del(&sdata->reserved_chanctx_list); 1016 sdata->reserved_chanctx = NULL; 1017 1018 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1019 CHANCTX_SWMODE_REASSIGN_VIF); 1020 if (err) { 1021 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1022 ieee80211_free_chanctx(local, new_ctx); 1023 1024 goto out; 1025 } 1026 1027 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1028 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1029 1030 if (sdata->vif.type == NL80211_IFTYPE_AP) 1031 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1032 1033 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1034 ieee80211_free_chanctx(local, old_ctx); 1035 1036 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1037 changed = BSS_CHANGED_BANDWIDTH; 1038 1039 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1040 1041 ieee80211_recalc_smps_chanctx(local, new_ctx); 1042 ieee80211_recalc_radar_chanctx(local, new_ctx); 1043 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1044 1045 if (changed) 1046 ieee80211_bss_info_change_notify(sdata, changed); 1047 1048 out: 1049 ieee80211_vif_chanctx_reservation_complete(sdata); 1050 return err; 1051 } 1052 1053 static int 1054 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1055 { 1056 struct ieee80211_local *local = sdata->local; 1057 struct ieee80211_chanctx *old_ctx, *new_ctx; 1058 const struct cfg80211_chan_def *chandef; 1059 int err; 1060 1061 old_ctx = ieee80211_vif_get_chanctx(sdata); 1062 new_ctx = sdata->reserved_chanctx; 1063 1064 if (WARN_ON(!sdata->reserved_ready)) 1065 return -EINVAL; 1066 1067 if (WARN_ON(old_ctx)) 1068 return -EINVAL; 1069 1070 if (WARN_ON(!new_ctx)) 1071 return -EINVAL; 1072 1073 if (WARN_ON(new_ctx->replace_state == 1074 IEEE80211_CHANCTX_REPLACES_OTHER)) 1075 return -EINVAL; 1076 1077 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1078 &sdata->reserved_chandef); 1079 if (WARN_ON(!chandef)) 1080 return -EINVAL; 1081 1082 list_del(&sdata->reserved_chanctx_list); 1083 sdata->reserved_chanctx = NULL; 1084 1085 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1086 if (err) { 1087 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1088 ieee80211_free_chanctx(local, new_ctx); 1089 1090 goto out; 1091 } 1092 1093 out: 1094 ieee80211_vif_chanctx_reservation_complete(sdata); 1095 return err; 1096 } 1097 1098 static bool 1099 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1100 { 1101 struct ieee80211_chanctx *old_ctx, *new_ctx; 1102 1103 lockdep_assert_held(&sdata->local->chanctx_mtx); 1104 1105 new_ctx = sdata->reserved_chanctx; 1106 old_ctx = ieee80211_vif_get_chanctx(sdata); 1107 1108 if (!old_ctx) 1109 return false; 1110 1111 if (WARN_ON(!new_ctx)) 1112 return false; 1113 1114 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1115 return false; 1116 1117 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1118 return false; 1119 1120 return true; 1121 } 1122 1123 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1124 struct ieee80211_chanctx *new_ctx) 1125 { 1126 const struct cfg80211_chan_def *chandef; 1127 1128 lockdep_assert_held(&local->mtx); 1129 lockdep_assert_held(&local->chanctx_mtx); 1130 1131 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1132 if (WARN_ON(!chandef)) 1133 return -EINVAL; 1134 1135 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1136 local->_oper_chandef = *chandef; 1137 ieee80211_hw_config(local, 0); 1138 1139 return 0; 1140 } 1141 1142 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1143 int n_vifs) 1144 { 1145 struct ieee80211_vif_chanctx_switch *vif_chsw; 1146 struct ieee80211_sub_if_data *sdata; 1147 struct ieee80211_chanctx *ctx, *old_ctx; 1148 int i, err; 1149 1150 lockdep_assert_held(&local->mtx); 1151 lockdep_assert_held(&local->chanctx_mtx); 1152 1153 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL); 1154 if (!vif_chsw) 1155 return -ENOMEM; 1156 1157 i = 0; 1158 list_for_each_entry(ctx, &local->chanctx_list, list) { 1159 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1160 continue; 1161 1162 if (WARN_ON(!ctx->replace_ctx)) { 1163 err = -EINVAL; 1164 goto out; 1165 } 1166 1167 list_for_each_entry(sdata, &ctx->reserved_vifs, 1168 reserved_chanctx_list) { 1169 if (!ieee80211_vif_has_in_place_reservation( 1170 sdata)) 1171 continue; 1172 1173 old_ctx = ieee80211_vif_get_chanctx(sdata); 1174 vif_chsw[i].vif = &sdata->vif; 1175 vif_chsw[i].old_ctx = &old_ctx->conf; 1176 vif_chsw[i].new_ctx = &ctx->conf; 1177 1178 i++; 1179 } 1180 } 1181 1182 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1183 CHANCTX_SWMODE_SWAP_CONTEXTS); 1184 1185 out: 1186 kfree(vif_chsw); 1187 return err; 1188 } 1189 1190 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1191 { 1192 struct ieee80211_chanctx *ctx; 1193 int err; 1194 1195 lockdep_assert_held(&local->mtx); 1196 lockdep_assert_held(&local->chanctx_mtx); 1197 1198 list_for_each_entry(ctx, &local->chanctx_list, list) { 1199 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1200 continue; 1201 1202 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1203 continue; 1204 1205 ieee80211_del_chanctx(local, ctx->replace_ctx); 1206 err = ieee80211_add_chanctx(local, ctx); 1207 if (err) 1208 goto err; 1209 } 1210 1211 return 0; 1212 1213 err: 1214 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1215 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1216 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1217 continue; 1218 1219 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1220 continue; 1221 1222 ieee80211_del_chanctx(local, ctx); 1223 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1224 } 1225 1226 return err; 1227 } 1228 1229 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1230 { 1231 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1232 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1233 struct ieee80211_chanctx *new_ctx = NULL; 1234 int i, err, n_assigned, n_reserved, n_ready; 1235 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1236 1237 lockdep_assert_held(&local->mtx); 1238 lockdep_assert_held(&local->chanctx_mtx); 1239 1240 /* 1241 * If there are 2 independent pairs of channel contexts performing 1242 * cross-switch of their vifs this code will still wait until both are 1243 * ready even though it could be possible to switch one before the 1244 * other is ready. 1245 * 1246 * For practical reasons and code simplicity just do a single huge 1247 * switch. 1248 */ 1249 1250 /* 1251 * Verify if the reservation is still feasible. 1252 * - if it's not then disconnect 1253 * - if it is but not all vifs necessary are ready then defer 1254 */ 1255 1256 list_for_each_entry(ctx, &local->chanctx_list, list) { 1257 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1258 continue; 1259 1260 if (WARN_ON(!ctx->replace_ctx)) { 1261 err = -EINVAL; 1262 goto err; 1263 } 1264 1265 if (!local->use_chanctx) 1266 new_ctx = ctx; 1267 1268 n_ctx++; 1269 1270 n_assigned = 0; 1271 n_reserved = 0; 1272 n_ready = 0; 1273 1274 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1275 assigned_chanctx_list) { 1276 n_assigned++; 1277 if (sdata->reserved_chanctx) { 1278 n_reserved++; 1279 if (sdata->reserved_ready) 1280 n_ready++; 1281 } 1282 } 1283 1284 if (n_assigned != n_reserved) { 1285 if (n_ready == n_reserved) { 1286 wiphy_info(local->hw.wiphy, 1287 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1288 err = -EBUSY; 1289 goto err; 1290 } 1291 1292 return -EAGAIN; 1293 } 1294 1295 ctx->conf.radar_enabled = false; 1296 list_for_each_entry(sdata, &ctx->reserved_vifs, 1297 reserved_chanctx_list) { 1298 if (ieee80211_vif_has_in_place_reservation(sdata) && 1299 !sdata->reserved_ready) 1300 return -EAGAIN; 1301 1302 old_ctx = ieee80211_vif_get_chanctx(sdata); 1303 if (old_ctx) { 1304 if (old_ctx->replace_state == 1305 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1306 n_vifs_switch++; 1307 else 1308 n_vifs_assign++; 1309 } else { 1310 n_vifs_ctxless++; 1311 } 1312 1313 if (sdata->reserved_radar_required) 1314 ctx->conf.radar_enabled = true; 1315 } 1316 } 1317 1318 if (WARN_ON(n_ctx == 0) || 1319 WARN_ON(n_vifs_switch == 0 && 1320 n_vifs_assign == 0 && 1321 n_vifs_ctxless == 0) || 1322 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1323 WARN_ON(!new_ctx && !local->use_chanctx)) { 1324 err = -EINVAL; 1325 goto err; 1326 } 1327 1328 /* 1329 * All necessary vifs are ready. Perform the switch now depending on 1330 * reservations and driver capabilities. 1331 */ 1332 1333 if (local->use_chanctx) { 1334 if (n_vifs_switch > 0) { 1335 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1336 if (err) 1337 goto err; 1338 } 1339 1340 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1341 err = ieee80211_chsw_switch_ctxs(local); 1342 if (err) 1343 goto err; 1344 } 1345 } else { 1346 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1347 if (err) 1348 goto err; 1349 } 1350 1351 /* 1352 * Update all structures, values and pointers to point to new channel 1353 * context(s). 1354 */ 1355 1356 i = 0; 1357 list_for_each_entry(ctx, &local->chanctx_list, list) { 1358 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1359 continue; 1360 1361 if (WARN_ON(!ctx->replace_ctx)) { 1362 err = -EINVAL; 1363 goto err; 1364 } 1365 1366 list_for_each_entry(sdata, &ctx->reserved_vifs, 1367 reserved_chanctx_list) { 1368 u32 changed = 0; 1369 1370 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1371 continue; 1372 1373 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1374 1375 if (sdata->vif.type == NL80211_IFTYPE_AP) 1376 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1377 false); 1378 1379 sdata->radar_required = sdata->reserved_radar_required; 1380 1381 if (sdata->vif.bss_conf.chandef.width != 1382 sdata->reserved_chandef.width) 1383 changed = BSS_CHANGED_BANDWIDTH; 1384 1385 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1386 if (changed) 1387 ieee80211_bss_info_change_notify(sdata, 1388 changed); 1389 1390 ieee80211_recalc_txpower(sdata, false); 1391 } 1392 1393 ieee80211_recalc_chanctx_chantype(local, ctx); 1394 ieee80211_recalc_smps_chanctx(local, ctx); 1395 ieee80211_recalc_radar_chanctx(local, ctx); 1396 ieee80211_recalc_chanctx_min_def(local, ctx); 1397 1398 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1399 reserved_chanctx_list) { 1400 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1401 continue; 1402 1403 list_del(&sdata->reserved_chanctx_list); 1404 list_move(&sdata->assigned_chanctx_list, 1405 &ctx->assigned_vifs); 1406 sdata->reserved_chanctx = NULL; 1407 1408 ieee80211_vif_chanctx_reservation_complete(sdata); 1409 } 1410 1411 /* 1412 * This context might have been a dependency for an already 1413 * ready re-assign reservation interface that was deferred. Do 1414 * not propagate error to the caller though. The in-place 1415 * reservation for originally requested interface has already 1416 * succeeded at this point. 1417 */ 1418 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1419 reserved_chanctx_list) { 1420 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1421 sdata))) 1422 continue; 1423 1424 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1425 continue; 1426 1427 if (!sdata->reserved_ready) 1428 continue; 1429 1430 if (ieee80211_vif_get_chanctx(sdata)) 1431 err = ieee80211_vif_use_reserved_reassign( 1432 sdata); 1433 else 1434 err = ieee80211_vif_use_reserved_assign(sdata); 1435 1436 if (err) { 1437 sdata_info(sdata, 1438 "failed to finalize (re-)assign reservation (err=%d)\n", 1439 err); 1440 ieee80211_vif_unreserve_chanctx(sdata); 1441 cfg80211_stop_iface(local->hw.wiphy, 1442 &sdata->wdev, 1443 GFP_KERNEL); 1444 } 1445 } 1446 } 1447 1448 /* 1449 * Finally free old contexts 1450 */ 1451 1452 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1453 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1454 continue; 1455 1456 ctx->replace_ctx->replace_ctx = NULL; 1457 ctx->replace_ctx->replace_state = 1458 IEEE80211_CHANCTX_REPLACE_NONE; 1459 1460 list_del_rcu(&ctx->list); 1461 kfree_rcu(ctx, rcu_head); 1462 } 1463 1464 return 0; 1465 1466 err: 1467 list_for_each_entry(ctx, &local->chanctx_list, list) { 1468 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1469 continue; 1470 1471 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1472 reserved_chanctx_list) { 1473 ieee80211_vif_unreserve_chanctx(sdata); 1474 ieee80211_vif_chanctx_reservation_complete(sdata); 1475 } 1476 } 1477 1478 return err; 1479 } 1480 1481 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1482 { 1483 struct ieee80211_local *local = sdata->local; 1484 struct ieee80211_chanctx_conf *conf; 1485 struct ieee80211_chanctx *ctx; 1486 bool use_reserved_switch = false; 1487 1488 lockdep_assert_held(&local->chanctx_mtx); 1489 1490 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1491 lockdep_is_held(&local->chanctx_mtx)); 1492 if (!conf) 1493 return; 1494 1495 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1496 1497 if (sdata->reserved_chanctx) { 1498 if (sdata->reserved_chanctx->replace_state == 1499 IEEE80211_CHANCTX_REPLACES_OTHER && 1500 ieee80211_chanctx_num_reserved(local, 1501 sdata->reserved_chanctx) > 1) 1502 use_reserved_switch = true; 1503 1504 ieee80211_vif_unreserve_chanctx(sdata); 1505 } 1506 1507 ieee80211_assign_vif_chanctx(sdata, NULL); 1508 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1509 ieee80211_free_chanctx(local, ctx); 1510 1511 sdata->radar_required = false; 1512 1513 /* Unreserving may ready an in-place reservation. */ 1514 if (use_reserved_switch) 1515 ieee80211_vif_use_reserved_switch(local); 1516 } 1517 1518 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1519 const struct cfg80211_chan_def *chandef, 1520 enum ieee80211_chanctx_mode mode) 1521 { 1522 struct ieee80211_local *local = sdata->local; 1523 struct ieee80211_chanctx *ctx; 1524 u8 radar_detect_width = 0; 1525 int ret; 1526 1527 lockdep_assert_held(&local->mtx); 1528 1529 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1530 1531 mutex_lock(&local->chanctx_mtx); 1532 1533 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1534 chandef, 1535 sdata->wdev.iftype); 1536 if (ret < 0) 1537 goto out; 1538 if (ret > 0) 1539 radar_detect_width = BIT(chandef->width); 1540 1541 sdata->radar_required = ret; 1542 1543 ret = ieee80211_check_combinations(sdata, chandef, mode, 1544 radar_detect_width); 1545 if (ret < 0) 1546 goto out; 1547 1548 __ieee80211_vif_release_channel(sdata); 1549 1550 ctx = ieee80211_find_chanctx(local, chandef, mode); 1551 if (!ctx) 1552 ctx = ieee80211_new_chanctx(local, chandef, mode); 1553 if (IS_ERR(ctx)) { 1554 ret = PTR_ERR(ctx); 1555 goto out; 1556 } 1557 1558 ieee80211_vif_update_chandef(sdata, chandef); 1559 1560 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1561 if (ret) { 1562 /* if assign fails refcount stays the same */ 1563 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1564 ieee80211_free_chanctx(local, ctx); 1565 goto out; 1566 } 1567 1568 ieee80211_recalc_smps_chanctx(local, ctx); 1569 ieee80211_recalc_radar_chanctx(local, ctx); 1570 out: 1571 if (ret) 1572 sdata->radar_required = false; 1573 1574 mutex_unlock(&local->chanctx_mtx); 1575 return ret; 1576 } 1577 1578 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1579 { 1580 struct ieee80211_local *local = sdata->local; 1581 struct ieee80211_chanctx *new_ctx; 1582 struct ieee80211_chanctx *old_ctx; 1583 int err; 1584 1585 lockdep_assert_held(&local->mtx); 1586 lockdep_assert_held(&local->chanctx_mtx); 1587 1588 new_ctx = sdata->reserved_chanctx; 1589 old_ctx = ieee80211_vif_get_chanctx(sdata); 1590 1591 if (WARN_ON(!new_ctx)) 1592 return -EINVAL; 1593 1594 if (WARN_ON(new_ctx->replace_state == 1595 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1596 return -EINVAL; 1597 1598 if (WARN_ON(sdata->reserved_ready)) 1599 return -EINVAL; 1600 1601 sdata->reserved_ready = true; 1602 1603 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1604 if (old_ctx) 1605 err = ieee80211_vif_use_reserved_reassign(sdata); 1606 else 1607 err = ieee80211_vif_use_reserved_assign(sdata); 1608 1609 if (err) 1610 return err; 1611 } 1612 1613 /* 1614 * In-place reservation may need to be finalized now either if: 1615 * a) sdata is taking part in the swapping itself and is the last one 1616 * b) sdata has switched with a re-assign reservation to an existing 1617 * context readying in-place switching of old_ctx 1618 * 1619 * In case of (b) do not propagate the error up because the requested 1620 * sdata already switched successfully. Just spill an extra warning. 1621 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1622 * interfaces upon failure. 1623 */ 1624 if ((old_ctx && 1625 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1626 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1627 err = ieee80211_vif_use_reserved_switch(local); 1628 if (err && err != -EAGAIN) { 1629 if (new_ctx->replace_state == 1630 IEEE80211_CHANCTX_REPLACES_OTHER) 1631 return err; 1632 1633 wiphy_info(local->hw.wiphy, 1634 "depending in-place reservation failed (err=%d)\n", 1635 err); 1636 } 1637 } 1638 1639 return 0; 1640 } 1641 1642 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 1643 const struct cfg80211_chan_def *chandef, 1644 u32 *changed) 1645 { 1646 struct ieee80211_local *local = sdata->local; 1647 struct ieee80211_chanctx_conf *conf; 1648 struct ieee80211_chanctx *ctx; 1649 const struct cfg80211_chan_def *compat; 1650 int ret; 1651 1652 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1653 IEEE80211_CHAN_DISABLED)) 1654 return -EINVAL; 1655 1656 mutex_lock(&local->chanctx_mtx); 1657 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { 1658 ret = 0; 1659 goto out; 1660 } 1661 1662 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1663 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { 1664 ret = -EINVAL; 1665 goto out; 1666 } 1667 1668 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1669 lockdep_is_held(&local->chanctx_mtx)); 1670 if (!conf) { 1671 ret = -EINVAL; 1672 goto out; 1673 } 1674 1675 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1676 1677 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1678 if (!compat) { 1679 ret = -EINVAL; 1680 goto out; 1681 } 1682 1683 switch (ctx->replace_state) { 1684 case IEEE80211_CHANCTX_REPLACE_NONE: 1685 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) { 1686 ret = -EBUSY; 1687 goto out; 1688 } 1689 break; 1690 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1691 /* TODO: Perhaps the bandwidth change could be treated as a 1692 * reservation itself? */ 1693 ret = -EBUSY; 1694 goto out; 1695 case IEEE80211_CHANCTX_REPLACES_OTHER: 1696 /* channel context that is going to replace another channel 1697 * context doesn't really exist and shouldn't be assigned 1698 * anywhere yet */ 1699 WARN_ON(1); 1700 break; 1701 } 1702 1703 ieee80211_vif_update_chandef(sdata, chandef); 1704 1705 ieee80211_recalc_chanctx_chantype(local, ctx); 1706 1707 *changed |= BSS_CHANGED_BANDWIDTH; 1708 ret = 0; 1709 out: 1710 mutex_unlock(&local->chanctx_mtx); 1711 return ret; 1712 } 1713 1714 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1715 { 1716 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1717 1718 lockdep_assert_held(&sdata->local->mtx); 1719 1720 mutex_lock(&sdata->local->chanctx_mtx); 1721 __ieee80211_vif_release_channel(sdata); 1722 mutex_unlock(&sdata->local->chanctx_mtx); 1723 } 1724 1725 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) 1726 { 1727 struct ieee80211_local *local = sdata->local; 1728 struct ieee80211_sub_if_data *ap; 1729 struct ieee80211_chanctx_conf *conf; 1730 1731 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 1732 return; 1733 1734 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1735 1736 mutex_lock(&local->chanctx_mtx); 1737 1738 conf = rcu_dereference_protected(ap->vif.chanctx_conf, 1739 lockdep_is_held(&local->chanctx_mtx)); 1740 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 1741 mutex_unlock(&local->chanctx_mtx); 1742 } 1743 1744 void ieee80211_iter_chan_contexts_atomic( 1745 struct ieee80211_hw *hw, 1746 void (*iter)(struct ieee80211_hw *hw, 1747 struct ieee80211_chanctx_conf *chanctx_conf, 1748 void *data), 1749 void *iter_data) 1750 { 1751 struct ieee80211_local *local = hw_to_local(hw); 1752 struct ieee80211_chanctx *ctx; 1753 1754 rcu_read_lock(); 1755 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 1756 if (ctx->driver_present) 1757 iter(hw, &ctx->conf, iter_data); 1758 rcu_read_unlock(); 1759 } 1760 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 1761