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 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta)); 235 } 236 rcu_read_unlock(); 237 238 return max_bw; 239 } 240 241 static enum nl80211_chan_width 242 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 243 struct ieee80211_chanctx_conf *conf) 244 { 245 struct ieee80211_sub_if_data *sdata; 246 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 247 248 rcu_read_lock(); 249 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 250 struct ieee80211_vif *vif = &sdata->vif; 251 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 252 253 if (!ieee80211_sdata_running(sdata)) 254 continue; 255 256 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 257 continue; 258 259 switch (vif->type) { 260 case NL80211_IFTYPE_AP: 261 case NL80211_IFTYPE_AP_VLAN: 262 width = ieee80211_get_max_required_bw(sdata); 263 break; 264 case NL80211_IFTYPE_STATION: 265 /* 266 * The ap's sta->bandwidth is not set yet at this 267 * point, so take the width from the chandef, but 268 * account also for TDLS peers 269 */ 270 width = max(vif->bss_conf.chandef.width, 271 ieee80211_get_max_required_bw(sdata)); 272 break; 273 case NL80211_IFTYPE_P2P_DEVICE: 274 case NL80211_IFTYPE_NAN: 275 continue; 276 case NL80211_IFTYPE_ADHOC: 277 case NL80211_IFTYPE_WDS: 278 case NL80211_IFTYPE_MESH_POINT: 279 case NL80211_IFTYPE_OCB: 280 width = vif->bss_conf.chandef.width; 281 break; 282 case NL80211_IFTYPE_UNSPECIFIED: 283 case NUM_NL80211_IFTYPES: 284 case NL80211_IFTYPE_MONITOR: 285 case NL80211_IFTYPE_P2P_CLIENT: 286 case NL80211_IFTYPE_P2P_GO: 287 WARN_ON_ONCE(1); 288 } 289 max_bw = max(max_bw, width); 290 } 291 292 /* use the configured bandwidth in case of monitor interface */ 293 sdata = rcu_dereference(local->monitor_sdata); 294 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 295 max_bw = max(max_bw, conf->def.width); 296 297 rcu_read_unlock(); 298 299 return max_bw; 300 } 301 302 /* 303 * recalc the min required chan width of the channel context, which is 304 * the max of min required widths of all the interfaces bound to this 305 * channel context. 306 */ 307 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 308 struct ieee80211_chanctx *ctx) 309 { 310 enum nl80211_chan_width max_bw; 311 struct cfg80211_chan_def min_def; 312 313 lockdep_assert_held(&local->chanctx_mtx); 314 315 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */ 316 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 317 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 318 ctx->conf.radar_enabled) { 319 ctx->conf.min_def = ctx->conf.def; 320 return; 321 } 322 323 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 324 325 /* downgrade chandef up to max_bw */ 326 min_def = ctx->conf.def; 327 while (min_def.width > max_bw) 328 ieee80211_chandef_downgrade(&min_def); 329 330 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 331 return; 332 333 ctx->conf.min_def = min_def; 334 if (!ctx->driver_present) 335 return; 336 337 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH); 338 } 339 340 static void ieee80211_change_chanctx(struct ieee80211_local *local, 341 struct ieee80211_chanctx *ctx, 342 const struct cfg80211_chan_def *chandef) 343 { 344 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 345 ieee80211_recalc_chanctx_min_def(local, ctx); 346 return; 347 } 348 349 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 350 351 ctx->conf.def = *chandef; 352 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); 353 ieee80211_recalc_chanctx_min_def(local, ctx); 354 355 if (!local->use_chanctx) { 356 local->_oper_chandef = *chandef; 357 ieee80211_hw_config(local, 0); 358 } 359 } 360 361 static struct ieee80211_chanctx * 362 ieee80211_find_chanctx(struct ieee80211_local *local, 363 const struct cfg80211_chan_def *chandef, 364 enum ieee80211_chanctx_mode mode) 365 { 366 struct ieee80211_chanctx *ctx; 367 368 lockdep_assert_held(&local->chanctx_mtx); 369 370 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 371 return NULL; 372 373 list_for_each_entry(ctx, &local->chanctx_list, list) { 374 const struct cfg80211_chan_def *compat; 375 376 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 377 continue; 378 379 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 380 continue; 381 382 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 383 if (!compat) 384 continue; 385 386 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 387 compat); 388 if (!compat) 389 continue; 390 391 ieee80211_change_chanctx(local, ctx, compat); 392 393 return ctx; 394 } 395 396 return NULL; 397 } 398 399 bool ieee80211_is_radar_required(struct ieee80211_local *local) 400 { 401 struct ieee80211_sub_if_data *sdata; 402 403 lockdep_assert_held(&local->mtx); 404 405 rcu_read_lock(); 406 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 407 if (sdata->radar_required) { 408 rcu_read_unlock(); 409 return true; 410 } 411 } 412 rcu_read_unlock(); 413 414 return false; 415 } 416 417 static bool 418 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 419 struct ieee80211_chanctx *ctx) 420 { 421 struct ieee80211_chanctx_conf *conf = &ctx->conf; 422 struct ieee80211_sub_if_data *sdata; 423 bool required = false; 424 425 lockdep_assert_held(&local->chanctx_mtx); 426 lockdep_assert_held(&local->mtx); 427 428 rcu_read_lock(); 429 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 430 if (!ieee80211_sdata_running(sdata)) 431 continue; 432 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 433 continue; 434 if (!sdata->radar_required) 435 continue; 436 437 required = true; 438 break; 439 } 440 rcu_read_unlock(); 441 442 return required; 443 } 444 445 static struct ieee80211_chanctx * 446 ieee80211_alloc_chanctx(struct ieee80211_local *local, 447 const struct cfg80211_chan_def *chandef, 448 enum ieee80211_chanctx_mode mode) 449 { 450 struct ieee80211_chanctx *ctx; 451 452 lockdep_assert_held(&local->chanctx_mtx); 453 454 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 455 if (!ctx) 456 return NULL; 457 458 INIT_LIST_HEAD(&ctx->assigned_vifs); 459 INIT_LIST_HEAD(&ctx->reserved_vifs); 460 ctx->conf.def = *chandef; 461 ctx->conf.rx_chains_static = 1; 462 ctx->conf.rx_chains_dynamic = 1; 463 ctx->mode = mode; 464 ctx->conf.radar_enabled = false; 465 ieee80211_recalc_chanctx_min_def(local, ctx); 466 467 return ctx; 468 } 469 470 static int ieee80211_add_chanctx(struct ieee80211_local *local, 471 struct ieee80211_chanctx *ctx) 472 { 473 u32 changed; 474 int err; 475 476 lockdep_assert_held(&local->mtx); 477 lockdep_assert_held(&local->chanctx_mtx); 478 479 if (!local->use_chanctx) 480 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 481 482 /* turn idle off *before* setting channel -- some drivers need that */ 483 changed = ieee80211_idle_off(local); 484 if (changed) 485 ieee80211_hw_config(local, changed); 486 487 if (!local->use_chanctx) { 488 local->_oper_chandef = ctx->conf.def; 489 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 490 } else { 491 err = drv_add_chanctx(local, ctx); 492 if (err) { 493 ieee80211_recalc_idle(local); 494 return err; 495 } 496 } 497 498 return 0; 499 } 500 501 static struct ieee80211_chanctx * 502 ieee80211_new_chanctx(struct ieee80211_local *local, 503 const struct cfg80211_chan_def *chandef, 504 enum ieee80211_chanctx_mode mode) 505 { 506 struct ieee80211_chanctx *ctx; 507 int err; 508 509 lockdep_assert_held(&local->mtx); 510 lockdep_assert_held(&local->chanctx_mtx); 511 512 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 513 if (!ctx) 514 return ERR_PTR(-ENOMEM); 515 516 err = ieee80211_add_chanctx(local, ctx); 517 if (err) { 518 kfree(ctx); 519 return ERR_PTR(err); 520 } 521 522 list_add_rcu(&ctx->list, &local->chanctx_list); 523 return ctx; 524 } 525 526 static void ieee80211_del_chanctx(struct ieee80211_local *local, 527 struct ieee80211_chanctx *ctx) 528 { 529 lockdep_assert_held(&local->chanctx_mtx); 530 531 if (!local->use_chanctx) { 532 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 533 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 534 chandef->center_freq1 = chandef->chan->center_freq; 535 chandef->center_freq2 = 0; 536 537 /* NOTE: Disabling radar is only valid here for 538 * single channel context. To be sure, check it ... 539 */ 540 WARN_ON(local->hw.conf.radar_enabled && 541 !list_empty(&local->chanctx_list)); 542 543 local->hw.conf.radar_enabled = false; 544 545 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 546 } else { 547 drv_remove_chanctx(local, ctx); 548 } 549 550 ieee80211_recalc_idle(local); 551 } 552 553 static void ieee80211_free_chanctx(struct ieee80211_local *local, 554 struct ieee80211_chanctx *ctx) 555 { 556 lockdep_assert_held(&local->chanctx_mtx); 557 558 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 559 560 list_del_rcu(&ctx->list); 561 ieee80211_del_chanctx(local, ctx); 562 kfree_rcu(ctx, rcu_head); 563 } 564 565 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 566 struct ieee80211_chanctx *ctx) 567 { 568 struct ieee80211_chanctx_conf *conf = &ctx->conf; 569 struct ieee80211_sub_if_data *sdata; 570 const struct cfg80211_chan_def *compat = NULL; 571 struct sta_info *sta; 572 573 lockdep_assert_held(&local->chanctx_mtx); 574 575 rcu_read_lock(); 576 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 577 578 if (!ieee80211_sdata_running(sdata)) 579 continue; 580 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 581 continue; 582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 583 continue; 584 585 if (!compat) 586 compat = &sdata->vif.bss_conf.chandef; 587 588 compat = cfg80211_chandef_compatible( 589 &sdata->vif.bss_conf.chandef, compat); 590 if (WARN_ON_ONCE(!compat)) 591 break; 592 } 593 594 /* TDLS peers can sometimes affect the chandef width */ 595 list_for_each_entry_rcu(sta, &local->sta_list, list) { 596 if (!sta->uploaded || 597 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 598 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 599 !sta->tdls_chandef.chan) 600 continue; 601 602 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 603 compat); 604 if (WARN_ON_ONCE(!compat)) 605 break; 606 } 607 rcu_read_unlock(); 608 609 if (!compat) 610 return; 611 612 ieee80211_change_chanctx(local, ctx, compat); 613 } 614 615 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 616 struct ieee80211_chanctx *chanctx) 617 { 618 bool radar_enabled; 619 620 lockdep_assert_held(&local->chanctx_mtx); 621 /* for ieee80211_is_radar_required */ 622 lockdep_assert_held(&local->mtx); 623 624 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 625 626 if (radar_enabled == chanctx->conf.radar_enabled) 627 return; 628 629 chanctx->conf.radar_enabled = radar_enabled; 630 631 if (!local->use_chanctx) { 632 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 633 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 634 } 635 636 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 637 } 638 639 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 640 struct ieee80211_chanctx *new_ctx) 641 { 642 struct ieee80211_local *local = sdata->local; 643 struct ieee80211_chanctx_conf *conf; 644 struct ieee80211_chanctx *curr_ctx = NULL; 645 int ret = 0; 646 647 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 648 return -ENOTSUPP; 649 650 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 651 lockdep_is_held(&local->chanctx_mtx)); 652 653 if (conf) { 654 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 655 656 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 657 conf = NULL; 658 list_del(&sdata->assigned_chanctx_list); 659 } 660 661 if (new_ctx) { 662 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 663 if (ret) 664 goto out; 665 666 conf = &new_ctx->conf; 667 list_add(&sdata->assigned_chanctx_list, 668 &new_ctx->assigned_vifs); 669 } 670 671 out: 672 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 673 674 sdata->vif.bss_conf.idle = !conf; 675 676 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 677 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 678 ieee80211_recalc_smps_chanctx(local, curr_ctx); 679 ieee80211_recalc_radar_chanctx(local, curr_ctx); 680 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 681 } 682 683 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 684 ieee80211_recalc_txpower(sdata, false); 685 ieee80211_recalc_chanctx_min_def(local, new_ctx); 686 } 687 688 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 689 sdata->vif.type != NL80211_IFTYPE_MONITOR) 690 ieee80211_bss_info_change_notify(sdata, 691 BSS_CHANGED_IDLE); 692 693 ieee80211_check_fast_xmit_iface(sdata); 694 695 return ret; 696 } 697 698 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 699 struct ieee80211_chanctx *chanctx) 700 { 701 struct ieee80211_sub_if_data *sdata; 702 u8 rx_chains_static, rx_chains_dynamic; 703 704 lockdep_assert_held(&local->chanctx_mtx); 705 706 rx_chains_static = 1; 707 rx_chains_dynamic = 1; 708 709 rcu_read_lock(); 710 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 711 u8 needed_static, needed_dynamic; 712 713 if (!ieee80211_sdata_running(sdata)) 714 continue; 715 716 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 717 &chanctx->conf) 718 continue; 719 720 switch (sdata->vif.type) { 721 case NL80211_IFTYPE_P2P_DEVICE: 722 case NL80211_IFTYPE_NAN: 723 continue; 724 case NL80211_IFTYPE_STATION: 725 if (!sdata->u.mgd.associated) 726 continue; 727 break; 728 case NL80211_IFTYPE_AP_VLAN: 729 continue; 730 case NL80211_IFTYPE_AP: 731 case NL80211_IFTYPE_ADHOC: 732 case NL80211_IFTYPE_WDS: 733 case NL80211_IFTYPE_MESH_POINT: 734 case NL80211_IFTYPE_OCB: 735 break; 736 default: 737 WARN_ON_ONCE(1); 738 } 739 740 switch (sdata->smps_mode) { 741 default: 742 WARN_ONCE(1, "Invalid SMPS mode %d\n", 743 sdata->smps_mode); 744 /* fall through */ 745 case IEEE80211_SMPS_OFF: 746 needed_static = sdata->needed_rx_chains; 747 needed_dynamic = sdata->needed_rx_chains; 748 break; 749 case IEEE80211_SMPS_DYNAMIC: 750 needed_static = 1; 751 needed_dynamic = sdata->needed_rx_chains; 752 break; 753 case IEEE80211_SMPS_STATIC: 754 needed_static = 1; 755 needed_dynamic = 1; 756 break; 757 } 758 759 rx_chains_static = max(rx_chains_static, needed_static); 760 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 761 } 762 763 /* Disable SMPS for the monitor interface */ 764 sdata = rcu_dereference(local->monitor_sdata); 765 if (sdata && 766 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 767 rx_chains_dynamic = rx_chains_static = local->rx_chains; 768 769 rcu_read_unlock(); 770 771 if (!local->use_chanctx) { 772 if (rx_chains_static > 1) 773 local->smps_mode = IEEE80211_SMPS_OFF; 774 else if (rx_chains_dynamic > 1) 775 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 776 else 777 local->smps_mode = IEEE80211_SMPS_STATIC; 778 ieee80211_hw_config(local, 0); 779 } 780 781 if (rx_chains_static == chanctx->conf.rx_chains_static && 782 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 783 return; 784 785 chanctx->conf.rx_chains_static = rx_chains_static; 786 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 787 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 788 } 789 790 static void 791 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 792 bool clear) 793 { 794 struct ieee80211_local *local __maybe_unused = sdata->local; 795 struct ieee80211_sub_if_data *vlan; 796 struct ieee80211_chanctx_conf *conf; 797 798 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 799 return; 800 801 lockdep_assert_held(&local->mtx); 802 803 /* Check that conf exists, even when clearing this function 804 * must be called with the AP's channel context still there 805 * as it would otherwise cause VLANs to have an invalid 806 * channel context pointer for a while, possibly pointing 807 * to a channel context that has already been freed. 808 */ 809 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 810 lockdep_is_held(&local->chanctx_mtx)); 811 WARN_ON(!conf); 812 813 if (clear) 814 conf = NULL; 815 816 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 817 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 818 } 819 820 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 821 bool clear) 822 { 823 struct ieee80211_local *local = sdata->local; 824 825 mutex_lock(&local->chanctx_mtx); 826 827 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 828 829 mutex_unlock(&local->chanctx_mtx); 830 } 831 832 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 833 { 834 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 835 836 lockdep_assert_held(&sdata->local->chanctx_mtx); 837 838 if (WARN_ON(!ctx)) 839 return -EINVAL; 840 841 list_del(&sdata->reserved_chanctx_list); 842 sdata->reserved_chanctx = NULL; 843 844 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 845 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 846 if (WARN_ON(!ctx->replace_ctx)) 847 return -EINVAL; 848 849 WARN_ON(ctx->replace_ctx->replace_state != 850 IEEE80211_CHANCTX_WILL_BE_REPLACED); 851 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 852 853 ctx->replace_ctx->replace_ctx = NULL; 854 ctx->replace_ctx->replace_state = 855 IEEE80211_CHANCTX_REPLACE_NONE; 856 857 list_del_rcu(&ctx->list); 858 kfree_rcu(ctx, rcu_head); 859 } else { 860 ieee80211_free_chanctx(sdata->local, ctx); 861 } 862 } 863 864 return 0; 865 } 866 867 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 868 const struct cfg80211_chan_def *chandef, 869 enum ieee80211_chanctx_mode mode, 870 bool radar_required) 871 { 872 struct ieee80211_local *local = sdata->local; 873 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 874 875 lockdep_assert_held(&local->chanctx_mtx); 876 877 curr_ctx = ieee80211_vif_get_chanctx(sdata); 878 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 879 return -ENOTSUPP; 880 881 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 882 if (!new_ctx) { 883 if (ieee80211_can_create_new_chanctx(local)) { 884 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 885 if (IS_ERR(new_ctx)) 886 return PTR_ERR(new_ctx); 887 } else { 888 if (!curr_ctx || 889 (curr_ctx->replace_state == 890 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 891 !list_empty(&curr_ctx->reserved_vifs)) { 892 /* 893 * Another vif already requested this context 894 * for a reservation. Find another one hoping 895 * all vifs assigned to it will also switch 896 * soon enough. 897 * 898 * TODO: This needs a little more work as some 899 * cases (more than 2 chanctx capable devices) 900 * may fail which could otherwise succeed 901 * provided some channel context juggling was 902 * performed. 903 * 904 * Consider ctx1..3, vif1..6, each ctx has 2 905 * vifs. vif1 and vif2 from ctx1 request new 906 * different chandefs starting 2 in-place 907 * reserations with ctx4 and ctx5 replacing 908 * ctx1 and ctx2 respectively. Next vif5 and 909 * vif6 from ctx3 reserve ctx4. If vif3 and 910 * vif4 remain on ctx2 as they are then this 911 * fails unless `replace_ctx` from ctx5 is 912 * replaced with ctx3. 913 */ 914 list_for_each_entry(ctx, &local->chanctx_list, 915 list) { 916 if (ctx->replace_state != 917 IEEE80211_CHANCTX_REPLACE_NONE) 918 continue; 919 920 if (!list_empty(&ctx->reserved_vifs)) 921 continue; 922 923 curr_ctx = ctx; 924 break; 925 } 926 } 927 928 /* 929 * If that's true then all available contexts already 930 * have reservations and cannot be used. 931 */ 932 if (!curr_ctx || 933 (curr_ctx->replace_state == 934 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 935 !list_empty(&curr_ctx->reserved_vifs)) 936 return -EBUSY; 937 938 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 939 if (!new_ctx) 940 return -ENOMEM; 941 942 new_ctx->replace_ctx = curr_ctx; 943 new_ctx->replace_state = 944 IEEE80211_CHANCTX_REPLACES_OTHER; 945 946 curr_ctx->replace_ctx = new_ctx; 947 curr_ctx->replace_state = 948 IEEE80211_CHANCTX_WILL_BE_REPLACED; 949 950 list_add_rcu(&new_ctx->list, &local->chanctx_list); 951 } 952 } 953 954 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 955 sdata->reserved_chanctx = new_ctx; 956 sdata->reserved_chandef = *chandef; 957 sdata->reserved_radar_required = radar_required; 958 sdata->reserved_ready = false; 959 960 return 0; 961 } 962 963 static void 964 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 965 { 966 switch (sdata->vif.type) { 967 case NL80211_IFTYPE_ADHOC: 968 case NL80211_IFTYPE_AP: 969 case NL80211_IFTYPE_MESH_POINT: 970 case NL80211_IFTYPE_OCB: 971 ieee80211_queue_work(&sdata->local->hw, 972 &sdata->csa_finalize_work); 973 break; 974 case NL80211_IFTYPE_STATION: 975 ieee80211_queue_work(&sdata->local->hw, 976 &sdata->u.mgd.chswitch_work); 977 break; 978 case NL80211_IFTYPE_UNSPECIFIED: 979 case NL80211_IFTYPE_AP_VLAN: 980 case NL80211_IFTYPE_WDS: 981 case NL80211_IFTYPE_MONITOR: 982 case NL80211_IFTYPE_P2P_CLIENT: 983 case NL80211_IFTYPE_P2P_GO: 984 case NL80211_IFTYPE_P2P_DEVICE: 985 case NL80211_IFTYPE_NAN: 986 case NUM_NL80211_IFTYPES: 987 WARN_ON(1); 988 break; 989 } 990 } 991 992 static void 993 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 994 const struct cfg80211_chan_def *chandef) 995 { 996 struct ieee80211_sub_if_data *vlan; 997 998 sdata->vif.bss_conf.chandef = *chandef; 999 1000 if (sdata->vif.type != NL80211_IFTYPE_AP) 1001 return; 1002 1003 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1004 vlan->vif.bss_conf.chandef = *chandef; 1005 } 1006 1007 static int 1008 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1009 { 1010 struct ieee80211_local *local = sdata->local; 1011 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1012 struct ieee80211_chanctx *old_ctx, *new_ctx; 1013 const struct cfg80211_chan_def *chandef; 1014 u32 changed = 0; 1015 int err; 1016 1017 lockdep_assert_held(&local->mtx); 1018 lockdep_assert_held(&local->chanctx_mtx); 1019 1020 new_ctx = sdata->reserved_chanctx; 1021 old_ctx = ieee80211_vif_get_chanctx(sdata); 1022 1023 if (WARN_ON(!sdata->reserved_ready)) 1024 return -EBUSY; 1025 1026 if (WARN_ON(!new_ctx)) 1027 return -EINVAL; 1028 1029 if (WARN_ON(!old_ctx)) 1030 return -EINVAL; 1031 1032 if (WARN_ON(new_ctx->replace_state == 1033 IEEE80211_CHANCTX_REPLACES_OTHER)) 1034 return -EINVAL; 1035 1036 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1037 &sdata->reserved_chandef); 1038 if (WARN_ON(!chandef)) 1039 return -EINVAL; 1040 1041 ieee80211_change_chanctx(local, new_ctx, chandef); 1042 1043 vif_chsw[0].vif = &sdata->vif; 1044 vif_chsw[0].old_ctx = &old_ctx->conf; 1045 vif_chsw[0].new_ctx = &new_ctx->conf; 1046 1047 list_del(&sdata->reserved_chanctx_list); 1048 sdata->reserved_chanctx = NULL; 1049 1050 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1051 CHANCTX_SWMODE_REASSIGN_VIF); 1052 if (err) { 1053 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1054 ieee80211_free_chanctx(local, new_ctx); 1055 1056 goto out; 1057 } 1058 1059 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1060 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1061 1062 if (sdata->vif.type == NL80211_IFTYPE_AP) 1063 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1064 1065 ieee80211_check_fast_xmit_iface(sdata); 1066 1067 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1068 ieee80211_free_chanctx(local, old_ctx); 1069 1070 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1071 changed = BSS_CHANGED_BANDWIDTH; 1072 1073 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1074 1075 ieee80211_recalc_smps_chanctx(local, new_ctx); 1076 ieee80211_recalc_radar_chanctx(local, new_ctx); 1077 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1078 1079 if (changed) 1080 ieee80211_bss_info_change_notify(sdata, changed); 1081 1082 out: 1083 ieee80211_vif_chanctx_reservation_complete(sdata); 1084 return err; 1085 } 1086 1087 static int 1088 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1089 { 1090 struct ieee80211_local *local = sdata->local; 1091 struct ieee80211_chanctx *old_ctx, *new_ctx; 1092 const struct cfg80211_chan_def *chandef; 1093 int err; 1094 1095 old_ctx = ieee80211_vif_get_chanctx(sdata); 1096 new_ctx = sdata->reserved_chanctx; 1097 1098 if (WARN_ON(!sdata->reserved_ready)) 1099 return -EINVAL; 1100 1101 if (WARN_ON(old_ctx)) 1102 return -EINVAL; 1103 1104 if (WARN_ON(!new_ctx)) 1105 return -EINVAL; 1106 1107 if (WARN_ON(new_ctx->replace_state == 1108 IEEE80211_CHANCTX_REPLACES_OTHER)) 1109 return -EINVAL; 1110 1111 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1112 &sdata->reserved_chandef); 1113 if (WARN_ON(!chandef)) 1114 return -EINVAL; 1115 1116 ieee80211_change_chanctx(local, new_ctx, chandef); 1117 1118 list_del(&sdata->reserved_chanctx_list); 1119 sdata->reserved_chanctx = NULL; 1120 1121 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1122 if (err) { 1123 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1124 ieee80211_free_chanctx(local, new_ctx); 1125 1126 goto out; 1127 } 1128 1129 out: 1130 ieee80211_vif_chanctx_reservation_complete(sdata); 1131 return err; 1132 } 1133 1134 static bool 1135 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1136 { 1137 struct ieee80211_chanctx *old_ctx, *new_ctx; 1138 1139 lockdep_assert_held(&sdata->local->chanctx_mtx); 1140 1141 new_ctx = sdata->reserved_chanctx; 1142 old_ctx = ieee80211_vif_get_chanctx(sdata); 1143 1144 if (!old_ctx) 1145 return false; 1146 1147 if (WARN_ON(!new_ctx)) 1148 return false; 1149 1150 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1151 return false; 1152 1153 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1154 return false; 1155 1156 return true; 1157 } 1158 1159 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1160 struct ieee80211_chanctx *new_ctx) 1161 { 1162 const struct cfg80211_chan_def *chandef; 1163 1164 lockdep_assert_held(&local->mtx); 1165 lockdep_assert_held(&local->chanctx_mtx); 1166 1167 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1168 if (WARN_ON(!chandef)) 1169 return -EINVAL; 1170 1171 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1172 local->_oper_chandef = *chandef; 1173 ieee80211_hw_config(local, 0); 1174 1175 return 0; 1176 } 1177 1178 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1179 int n_vifs) 1180 { 1181 struct ieee80211_vif_chanctx_switch *vif_chsw; 1182 struct ieee80211_sub_if_data *sdata; 1183 struct ieee80211_chanctx *ctx, *old_ctx; 1184 int i, err; 1185 1186 lockdep_assert_held(&local->mtx); 1187 lockdep_assert_held(&local->chanctx_mtx); 1188 1189 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL); 1190 if (!vif_chsw) 1191 return -ENOMEM; 1192 1193 i = 0; 1194 list_for_each_entry(ctx, &local->chanctx_list, list) { 1195 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1196 continue; 1197 1198 if (WARN_ON(!ctx->replace_ctx)) { 1199 err = -EINVAL; 1200 goto out; 1201 } 1202 1203 list_for_each_entry(sdata, &ctx->reserved_vifs, 1204 reserved_chanctx_list) { 1205 if (!ieee80211_vif_has_in_place_reservation( 1206 sdata)) 1207 continue; 1208 1209 old_ctx = ieee80211_vif_get_chanctx(sdata); 1210 vif_chsw[i].vif = &sdata->vif; 1211 vif_chsw[i].old_ctx = &old_ctx->conf; 1212 vif_chsw[i].new_ctx = &ctx->conf; 1213 1214 i++; 1215 } 1216 } 1217 1218 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1219 CHANCTX_SWMODE_SWAP_CONTEXTS); 1220 1221 out: 1222 kfree(vif_chsw); 1223 return err; 1224 } 1225 1226 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1227 { 1228 struct ieee80211_chanctx *ctx; 1229 int err; 1230 1231 lockdep_assert_held(&local->mtx); 1232 lockdep_assert_held(&local->chanctx_mtx); 1233 1234 list_for_each_entry(ctx, &local->chanctx_list, list) { 1235 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1236 continue; 1237 1238 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1239 continue; 1240 1241 ieee80211_del_chanctx(local, ctx->replace_ctx); 1242 err = ieee80211_add_chanctx(local, ctx); 1243 if (err) 1244 goto err; 1245 } 1246 1247 return 0; 1248 1249 err: 1250 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1251 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1252 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1253 continue; 1254 1255 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1256 continue; 1257 1258 ieee80211_del_chanctx(local, ctx); 1259 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1260 } 1261 1262 return err; 1263 } 1264 1265 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1266 { 1267 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1268 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1269 struct ieee80211_chanctx *new_ctx = NULL; 1270 int i, err, n_assigned, n_reserved, n_ready; 1271 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1272 1273 lockdep_assert_held(&local->mtx); 1274 lockdep_assert_held(&local->chanctx_mtx); 1275 1276 /* 1277 * If there are 2 independent pairs of channel contexts performing 1278 * cross-switch of their vifs this code will still wait until both are 1279 * ready even though it could be possible to switch one before the 1280 * other is ready. 1281 * 1282 * For practical reasons and code simplicity just do a single huge 1283 * switch. 1284 */ 1285 1286 /* 1287 * Verify if the reservation is still feasible. 1288 * - if it's not then disconnect 1289 * - if it is but not all vifs necessary are ready then defer 1290 */ 1291 1292 list_for_each_entry(ctx, &local->chanctx_list, list) { 1293 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1294 continue; 1295 1296 if (WARN_ON(!ctx->replace_ctx)) { 1297 err = -EINVAL; 1298 goto err; 1299 } 1300 1301 if (!local->use_chanctx) 1302 new_ctx = ctx; 1303 1304 n_ctx++; 1305 1306 n_assigned = 0; 1307 n_reserved = 0; 1308 n_ready = 0; 1309 1310 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1311 assigned_chanctx_list) { 1312 n_assigned++; 1313 if (sdata->reserved_chanctx) { 1314 n_reserved++; 1315 if (sdata->reserved_ready) 1316 n_ready++; 1317 } 1318 } 1319 1320 if (n_assigned != n_reserved) { 1321 if (n_ready == n_reserved) { 1322 wiphy_info(local->hw.wiphy, 1323 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1324 err = -EBUSY; 1325 goto err; 1326 } 1327 1328 return -EAGAIN; 1329 } 1330 1331 ctx->conf.radar_enabled = false; 1332 list_for_each_entry(sdata, &ctx->reserved_vifs, 1333 reserved_chanctx_list) { 1334 if (ieee80211_vif_has_in_place_reservation(sdata) && 1335 !sdata->reserved_ready) 1336 return -EAGAIN; 1337 1338 old_ctx = ieee80211_vif_get_chanctx(sdata); 1339 if (old_ctx) { 1340 if (old_ctx->replace_state == 1341 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1342 n_vifs_switch++; 1343 else 1344 n_vifs_assign++; 1345 } else { 1346 n_vifs_ctxless++; 1347 } 1348 1349 if (sdata->reserved_radar_required) 1350 ctx->conf.radar_enabled = true; 1351 } 1352 } 1353 1354 if (WARN_ON(n_ctx == 0) || 1355 WARN_ON(n_vifs_switch == 0 && 1356 n_vifs_assign == 0 && 1357 n_vifs_ctxless == 0) || 1358 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1359 WARN_ON(!new_ctx && !local->use_chanctx)) { 1360 err = -EINVAL; 1361 goto err; 1362 } 1363 1364 /* 1365 * All necessary vifs are ready. Perform the switch now depending on 1366 * reservations and driver capabilities. 1367 */ 1368 1369 if (local->use_chanctx) { 1370 if (n_vifs_switch > 0) { 1371 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1372 if (err) 1373 goto err; 1374 } 1375 1376 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1377 err = ieee80211_chsw_switch_ctxs(local); 1378 if (err) 1379 goto err; 1380 } 1381 } else { 1382 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1383 if (err) 1384 goto err; 1385 } 1386 1387 /* 1388 * Update all structures, values and pointers to point to new channel 1389 * context(s). 1390 */ 1391 1392 i = 0; 1393 list_for_each_entry(ctx, &local->chanctx_list, list) { 1394 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1395 continue; 1396 1397 if (WARN_ON(!ctx->replace_ctx)) { 1398 err = -EINVAL; 1399 goto err; 1400 } 1401 1402 list_for_each_entry(sdata, &ctx->reserved_vifs, 1403 reserved_chanctx_list) { 1404 u32 changed = 0; 1405 1406 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1407 continue; 1408 1409 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1410 1411 if (sdata->vif.type == NL80211_IFTYPE_AP) 1412 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1413 false); 1414 1415 ieee80211_check_fast_xmit_iface(sdata); 1416 1417 sdata->radar_required = sdata->reserved_radar_required; 1418 1419 if (sdata->vif.bss_conf.chandef.width != 1420 sdata->reserved_chandef.width) 1421 changed = BSS_CHANGED_BANDWIDTH; 1422 1423 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1424 if (changed) 1425 ieee80211_bss_info_change_notify(sdata, 1426 changed); 1427 1428 ieee80211_recalc_txpower(sdata, false); 1429 } 1430 1431 ieee80211_recalc_chanctx_chantype(local, ctx); 1432 ieee80211_recalc_smps_chanctx(local, ctx); 1433 ieee80211_recalc_radar_chanctx(local, ctx); 1434 ieee80211_recalc_chanctx_min_def(local, ctx); 1435 1436 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1437 reserved_chanctx_list) { 1438 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1439 continue; 1440 1441 list_del(&sdata->reserved_chanctx_list); 1442 list_move(&sdata->assigned_chanctx_list, 1443 &ctx->assigned_vifs); 1444 sdata->reserved_chanctx = NULL; 1445 1446 ieee80211_vif_chanctx_reservation_complete(sdata); 1447 } 1448 1449 /* 1450 * This context might have been a dependency for an already 1451 * ready re-assign reservation interface that was deferred. Do 1452 * not propagate error to the caller though. The in-place 1453 * reservation for originally requested interface has already 1454 * succeeded at this point. 1455 */ 1456 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1457 reserved_chanctx_list) { 1458 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1459 sdata))) 1460 continue; 1461 1462 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1463 continue; 1464 1465 if (!sdata->reserved_ready) 1466 continue; 1467 1468 if (ieee80211_vif_get_chanctx(sdata)) 1469 err = ieee80211_vif_use_reserved_reassign( 1470 sdata); 1471 else 1472 err = ieee80211_vif_use_reserved_assign(sdata); 1473 1474 if (err) { 1475 sdata_info(sdata, 1476 "failed to finalize (re-)assign reservation (err=%d)\n", 1477 err); 1478 ieee80211_vif_unreserve_chanctx(sdata); 1479 cfg80211_stop_iface(local->hw.wiphy, 1480 &sdata->wdev, 1481 GFP_KERNEL); 1482 } 1483 } 1484 } 1485 1486 /* 1487 * Finally free old contexts 1488 */ 1489 1490 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1491 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1492 continue; 1493 1494 ctx->replace_ctx->replace_ctx = NULL; 1495 ctx->replace_ctx->replace_state = 1496 IEEE80211_CHANCTX_REPLACE_NONE; 1497 1498 list_del_rcu(&ctx->list); 1499 kfree_rcu(ctx, rcu_head); 1500 } 1501 1502 return 0; 1503 1504 err: 1505 list_for_each_entry(ctx, &local->chanctx_list, list) { 1506 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1507 continue; 1508 1509 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1510 reserved_chanctx_list) { 1511 ieee80211_vif_unreserve_chanctx(sdata); 1512 ieee80211_vif_chanctx_reservation_complete(sdata); 1513 } 1514 } 1515 1516 return err; 1517 } 1518 1519 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1520 { 1521 struct ieee80211_local *local = sdata->local; 1522 struct ieee80211_chanctx_conf *conf; 1523 struct ieee80211_chanctx *ctx; 1524 bool use_reserved_switch = false; 1525 1526 lockdep_assert_held(&local->chanctx_mtx); 1527 1528 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1529 lockdep_is_held(&local->chanctx_mtx)); 1530 if (!conf) 1531 return; 1532 1533 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1534 1535 if (sdata->reserved_chanctx) { 1536 if (sdata->reserved_chanctx->replace_state == 1537 IEEE80211_CHANCTX_REPLACES_OTHER && 1538 ieee80211_chanctx_num_reserved(local, 1539 sdata->reserved_chanctx) > 1) 1540 use_reserved_switch = true; 1541 1542 ieee80211_vif_unreserve_chanctx(sdata); 1543 } 1544 1545 ieee80211_assign_vif_chanctx(sdata, NULL); 1546 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1547 ieee80211_free_chanctx(local, ctx); 1548 1549 sdata->radar_required = false; 1550 1551 /* Unreserving may ready an in-place reservation. */ 1552 if (use_reserved_switch) 1553 ieee80211_vif_use_reserved_switch(local); 1554 } 1555 1556 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1557 const struct cfg80211_chan_def *chandef, 1558 enum ieee80211_chanctx_mode mode) 1559 { 1560 struct ieee80211_local *local = sdata->local; 1561 struct ieee80211_chanctx *ctx; 1562 u8 radar_detect_width = 0; 1563 int ret; 1564 1565 lockdep_assert_held(&local->mtx); 1566 1567 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1568 1569 mutex_lock(&local->chanctx_mtx); 1570 1571 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1572 chandef, 1573 sdata->wdev.iftype); 1574 if (ret < 0) 1575 goto out; 1576 if (ret > 0) 1577 radar_detect_width = BIT(chandef->width); 1578 1579 sdata->radar_required = ret; 1580 1581 ret = ieee80211_check_combinations(sdata, chandef, mode, 1582 radar_detect_width); 1583 if (ret < 0) 1584 goto out; 1585 1586 __ieee80211_vif_release_channel(sdata); 1587 1588 ctx = ieee80211_find_chanctx(local, chandef, mode); 1589 if (!ctx) 1590 ctx = ieee80211_new_chanctx(local, chandef, mode); 1591 if (IS_ERR(ctx)) { 1592 ret = PTR_ERR(ctx); 1593 goto out; 1594 } 1595 1596 ieee80211_vif_update_chandef(sdata, chandef); 1597 1598 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1599 if (ret) { 1600 /* if assign fails refcount stays the same */ 1601 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1602 ieee80211_free_chanctx(local, ctx); 1603 goto out; 1604 } 1605 1606 ieee80211_recalc_smps_chanctx(local, ctx); 1607 ieee80211_recalc_radar_chanctx(local, ctx); 1608 out: 1609 if (ret) 1610 sdata->radar_required = false; 1611 1612 mutex_unlock(&local->chanctx_mtx); 1613 return ret; 1614 } 1615 1616 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1617 { 1618 struct ieee80211_local *local = sdata->local; 1619 struct ieee80211_chanctx *new_ctx; 1620 struct ieee80211_chanctx *old_ctx; 1621 int err; 1622 1623 lockdep_assert_held(&local->mtx); 1624 lockdep_assert_held(&local->chanctx_mtx); 1625 1626 new_ctx = sdata->reserved_chanctx; 1627 old_ctx = ieee80211_vif_get_chanctx(sdata); 1628 1629 if (WARN_ON(!new_ctx)) 1630 return -EINVAL; 1631 1632 if (WARN_ON(new_ctx->replace_state == 1633 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1634 return -EINVAL; 1635 1636 if (WARN_ON(sdata->reserved_ready)) 1637 return -EINVAL; 1638 1639 sdata->reserved_ready = true; 1640 1641 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1642 if (old_ctx) 1643 err = ieee80211_vif_use_reserved_reassign(sdata); 1644 else 1645 err = ieee80211_vif_use_reserved_assign(sdata); 1646 1647 if (err) 1648 return err; 1649 } 1650 1651 /* 1652 * In-place reservation may need to be finalized now either if: 1653 * a) sdata is taking part in the swapping itself and is the last one 1654 * b) sdata has switched with a re-assign reservation to an existing 1655 * context readying in-place switching of old_ctx 1656 * 1657 * In case of (b) do not propagate the error up because the requested 1658 * sdata already switched successfully. Just spill an extra warning. 1659 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1660 * interfaces upon failure. 1661 */ 1662 if ((old_ctx && 1663 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1664 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1665 err = ieee80211_vif_use_reserved_switch(local); 1666 if (err && err != -EAGAIN) { 1667 if (new_ctx->replace_state == 1668 IEEE80211_CHANCTX_REPLACES_OTHER) 1669 return err; 1670 1671 wiphy_info(local->hw.wiphy, 1672 "depending in-place reservation failed (err=%d)\n", 1673 err); 1674 } 1675 } 1676 1677 return 0; 1678 } 1679 1680 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 1681 const struct cfg80211_chan_def *chandef, 1682 u32 *changed) 1683 { 1684 struct ieee80211_local *local = sdata->local; 1685 struct ieee80211_chanctx_conf *conf; 1686 struct ieee80211_chanctx *ctx; 1687 const struct cfg80211_chan_def *compat; 1688 int ret; 1689 1690 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1691 IEEE80211_CHAN_DISABLED)) 1692 return -EINVAL; 1693 1694 mutex_lock(&local->chanctx_mtx); 1695 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { 1696 ret = 0; 1697 goto out; 1698 } 1699 1700 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1701 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { 1702 ret = -EINVAL; 1703 goto out; 1704 } 1705 1706 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1707 lockdep_is_held(&local->chanctx_mtx)); 1708 if (!conf) { 1709 ret = -EINVAL; 1710 goto out; 1711 } 1712 1713 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1714 1715 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1716 if (!compat) { 1717 ret = -EINVAL; 1718 goto out; 1719 } 1720 1721 switch (ctx->replace_state) { 1722 case IEEE80211_CHANCTX_REPLACE_NONE: 1723 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) { 1724 ret = -EBUSY; 1725 goto out; 1726 } 1727 break; 1728 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1729 /* TODO: Perhaps the bandwidth change could be treated as a 1730 * reservation itself? */ 1731 ret = -EBUSY; 1732 goto out; 1733 case IEEE80211_CHANCTX_REPLACES_OTHER: 1734 /* channel context that is going to replace another channel 1735 * context doesn't really exist and shouldn't be assigned 1736 * anywhere yet */ 1737 WARN_ON(1); 1738 break; 1739 } 1740 1741 ieee80211_vif_update_chandef(sdata, chandef); 1742 1743 ieee80211_recalc_chanctx_chantype(local, ctx); 1744 1745 *changed |= BSS_CHANGED_BANDWIDTH; 1746 ret = 0; 1747 out: 1748 mutex_unlock(&local->chanctx_mtx); 1749 return ret; 1750 } 1751 1752 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1753 { 1754 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1755 1756 lockdep_assert_held(&sdata->local->mtx); 1757 1758 mutex_lock(&sdata->local->chanctx_mtx); 1759 __ieee80211_vif_release_channel(sdata); 1760 mutex_unlock(&sdata->local->chanctx_mtx); 1761 } 1762 1763 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) 1764 { 1765 struct ieee80211_local *local = sdata->local; 1766 struct ieee80211_sub_if_data *ap; 1767 struct ieee80211_chanctx_conf *conf; 1768 1769 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 1770 return; 1771 1772 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1773 1774 mutex_lock(&local->chanctx_mtx); 1775 1776 conf = rcu_dereference_protected(ap->vif.chanctx_conf, 1777 lockdep_is_held(&local->chanctx_mtx)); 1778 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 1779 mutex_unlock(&local->chanctx_mtx); 1780 } 1781 1782 void ieee80211_iter_chan_contexts_atomic( 1783 struct ieee80211_hw *hw, 1784 void (*iter)(struct ieee80211_hw *hw, 1785 struct ieee80211_chanctx_conf *chanctx_conf, 1786 void *data), 1787 void *iter_data) 1788 { 1789 struct ieee80211_local *local = hw_to_local(hw); 1790 struct ieee80211_chanctx *ctx; 1791 1792 rcu_read_lock(); 1793 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 1794 if (ctx->driver_present) 1795 iter(hw, &ctx->conf, iter_data); 1796 rcu_read_unlock(); 1797 } 1798 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 1799