1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 - channel management 4 */ 5 6 #include <linux/nl80211.h> 7 #include <linux/export.h> 8 #include <linux/rtnetlink.h> 9 #include <net/cfg80211.h> 10 #include "ieee80211_i.h" 11 #include "driver-ops.h" 12 13 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local, 14 struct ieee80211_chanctx *ctx) 15 { 16 struct ieee80211_sub_if_data *sdata; 17 int num = 0; 18 19 lockdep_assert_held(&local->chanctx_mtx); 20 21 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list) 22 num++; 23 24 return num; 25 } 26 27 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local, 28 struct ieee80211_chanctx *ctx) 29 { 30 struct ieee80211_sub_if_data *sdata; 31 int num = 0; 32 33 lockdep_assert_held(&local->chanctx_mtx); 34 35 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list) 36 num++; 37 38 return num; 39 } 40 41 int ieee80211_chanctx_refcount(struct ieee80211_local *local, 42 struct ieee80211_chanctx *ctx) 43 { 44 return ieee80211_chanctx_num_assigned(local, ctx) + 45 ieee80211_chanctx_num_reserved(local, ctx); 46 } 47 48 static int ieee80211_num_chanctx(struct ieee80211_local *local) 49 { 50 struct ieee80211_chanctx *ctx; 51 int num = 0; 52 53 lockdep_assert_held(&local->chanctx_mtx); 54 55 list_for_each_entry(ctx, &local->chanctx_list, list) 56 num++; 57 58 return num; 59 } 60 61 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) 62 { 63 lockdep_assert_held(&local->chanctx_mtx); 64 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); 65 } 66 67 static struct ieee80211_chanctx * 68 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata) 69 { 70 struct ieee80211_local *local __maybe_unused = sdata->local; 71 struct ieee80211_chanctx_conf *conf; 72 73 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 74 lockdep_is_held(&local->chanctx_mtx)); 75 if (!conf) 76 return NULL; 77 78 return container_of(conf, struct ieee80211_chanctx, conf); 79 } 80 81 static const struct cfg80211_chan_def * 82 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local, 83 struct ieee80211_chanctx *ctx, 84 const struct cfg80211_chan_def *compat) 85 { 86 struct ieee80211_sub_if_data *sdata; 87 88 lockdep_assert_held(&local->chanctx_mtx); 89 90 list_for_each_entry(sdata, &ctx->reserved_vifs, 91 reserved_chanctx_list) { 92 if (!compat) 93 compat = &sdata->reserved_chandef; 94 95 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef, 96 compat); 97 if (!compat) 98 break; 99 } 100 101 return compat; 102 } 103 104 static const struct cfg80211_chan_def * 105 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local, 106 struct ieee80211_chanctx *ctx, 107 const struct cfg80211_chan_def *compat) 108 { 109 struct ieee80211_sub_if_data *sdata; 110 111 lockdep_assert_held(&local->chanctx_mtx); 112 113 list_for_each_entry(sdata, &ctx->assigned_vifs, 114 assigned_chanctx_list) { 115 if (sdata->reserved_chanctx != NULL) 116 continue; 117 118 if (!compat) 119 compat = &sdata->vif.bss_conf.chandef; 120 121 compat = cfg80211_chandef_compatible( 122 &sdata->vif.bss_conf.chandef, compat); 123 if (!compat) 124 break; 125 } 126 127 return compat; 128 } 129 130 static const struct cfg80211_chan_def * 131 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local, 132 struct ieee80211_chanctx *ctx, 133 const struct cfg80211_chan_def *compat) 134 { 135 lockdep_assert_held(&local->chanctx_mtx); 136 137 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat); 138 if (!compat) 139 return NULL; 140 141 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat); 142 if (!compat) 143 return NULL; 144 145 return compat; 146 } 147 148 static bool 149 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local, 150 struct ieee80211_chanctx *ctx, 151 const struct cfg80211_chan_def *def) 152 { 153 lockdep_assert_held(&local->chanctx_mtx); 154 155 if (ieee80211_chanctx_combined_chandef(local, ctx, def)) 156 return true; 157 158 if (!list_empty(&ctx->reserved_vifs) && 159 ieee80211_chanctx_reserved_chandef(local, ctx, def)) 160 return true; 161 162 return false; 163 } 164 165 static struct ieee80211_chanctx * 166 ieee80211_find_reservation_chanctx(struct ieee80211_local *local, 167 const struct cfg80211_chan_def *chandef, 168 enum ieee80211_chanctx_mode mode) 169 { 170 struct ieee80211_chanctx *ctx; 171 172 lockdep_assert_held(&local->chanctx_mtx); 173 174 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 175 return NULL; 176 177 list_for_each_entry(ctx, &local->chanctx_list, list) { 178 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 179 continue; 180 181 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 182 continue; 183 184 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx, 185 chandef)) 186 continue; 187 188 return ctx; 189 } 190 191 return NULL; 192 } 193 194 enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta) 195 { 196 switch (sta->bandwidth) { 197 case IEEE80211_STA_RX_BW_20: 198 if (sta->ht_cap.ht_supported) 199 return NL80211_CHAN_WIDTH_20; 200 else 201 return NL80211_CHAN_WIDTH_20_NOHT; 202 case IEEE80211_STA_RX_BW_40: 203 return NL80211_CHAN_WIDTH_40; 204 case IEEE80211_STA_RX_BW_80: 205 return NL80211_CHAN_WIDTH_80; 206 case IEEE80211_STA_RX_BW_160: 207 /* 208 * This applied for both 160 and 80+80. since we use 209 * the returned value to consider degradation of 210 * ctx->conf.min_def, we have to make sure to take 211 * the bigger one (NL80211_CHAN_WIDTH_160). 212 * Otherwise we might try degrading even when not 213 * needed, as the max required sta_bw returned (80+80) 214 * might be smaller than the configured bw (160). 215 */ 216 return NL80211_CHAN_WIDTH_160; 217 default: 218 WARN_ON(1); 219 return NL80211_CHAN_WIDTH_20; 220 } 221 } 222 223 static enum nl80211_chan_width 224 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata) 225 { 226 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 227 struct sta_info *sta; 228 229 rcu_read_lock(); 230 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { 231 if (sdata != sta->sdata && 232 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 233 continue; 234 235 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta)); 236 } 237 rcu_read_unlock(); 238 239 return max_bw; 240 } 241 242 static enum nl80211_chan_width 243 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 244 struct ieee80211_chanctx_conf *conf) 245 { 246 struct ieee80211_sub_if_data *sdata; 247 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 248 249 rcu_read_lock(); 250 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 251 struct ieee80211_vif *vif = &sdata->vif; 252 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 253 254 if (!ieee80211_sdata_running(sdata)) 255 continue; 256 257 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 258 continue; 259 260 switch (vif->type) { 261 case NL80211_IFTYPE_AP: 262 case NL80211_IFTYPE_AP_VLAN: 263 width = ieee80211_get_max_required_bw(sdata); 264 break; 265 case NL80211_IFTYPE_STATION: 266 /* 267 * The ap's sta->bandwidth is not set yet at this 268 * point, so take the width from the chandef, but 269 * account also for TDLS peers 270 */ 271 width = max(vif->bss_conf.chandef.width, 272 ieee80211_get_max_required_bw(sdata)); 273 break; 274 case NL80211_IFTYPE_P2P_DEVICE: 275 case NL80211_IFTYPE_NAN: 276 continue; 277 case NL80211_IFTYPE_ADHOC: 278 case NL80211_IFTYPE_WDS: 279 case NL80211_IFTYPE_MESH_POINT: 280 case NL80211_IFTYPE_OCB: 281 width = vif->bss_conf.chandef.width; 282 break; 283 case NL80211_IFTYPE_UNSPECIFIED: 284 case NUM_NL80211_IFTYPES: 285 case NL80211_IFTYPE_MONITOR: 286 case NL80211_IFTYPE_P2P_CLIENT: 287 case NL80211_IFTYPE_P2P_GO: 288 WARN_ON_ONCE(1); 289 } 290 max_bw = max(max_bw, width); 291 } 292 293 /* use the configured bandwidth in case of monitor interface */ 294 sdata = rcu_dereference(local->monitor_sdata); 295 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) 296 max_bw = max(max_bw, conf->def.width); 297 298 rcu_read_unlock(); 299 300 return max_bw; 301 } 302 303 /* 304 * recalc the min required chan width of the channel context, which is 305 * the max of min required widths of all the interfaces bound to this 306 * channel context. 307 */ 308 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 309 struct ieee80211_chanctx *ctx) 310 { 311 enum nl80211_chan_width max_bw; 312 struct cfg80211_chan_def min_def; 313 314 lockdep_assert_held(&local->chanctx_mtx); 315 316 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */ 317 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 318 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 319 ctx->conf.radar_enabled) { 320 ctx->conf.min_def = ctx->conf.def; 321 return; 322 } 323 324 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); 325 326 /* downgrade chandef up to max_bw */ 327 min_def = ctx->conf.def; 328 while (min_def.width > max_bw) 329 ieee80211_chandef_downgrade(&min_def); 330 331 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 332 return; 333 334 ctx->conf.min_def = min_def; 335 if (!ctx->driver_present) 336 return; 337 338 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH); 339 } 340 341 static void ieee80211_change_chanctx(struct ieee80211_local *local, 342 struct ieee80211_chanctx *ctx, 343 const struct cfg80211_chan_def *chandef) 344 { 345 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) { 346 ieee80211_recalc_chanctx_min_def(local, ctx); 347 return; 348 } 349 350 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); 351 352 ctx->conf.def = *chandef; 353 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); 354 ieee80211_recalc_chanctx_min_def(local, ctx); 355 356 if (!local->use_chanctx) { 357 local->_oper_chandef = *chandef; 358 ieee80211_hw_config(local, 0); 359 } 360 } 361 362 static struct ieee80211_chanctx * 363 ieee80211_find_chanctx(struct ieee80211_local *local, 364 const struct cfg80211_chan_def *chandef, 365 enum ieee80211_chanctx_mode mode) 366 { 367 struct ieee80211_chanctx *ctx; 368 369 lockdep_assert_held(&local->chanctx_mtx); 370 371 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 372 return NULL; 373 374 list_for_each_entry(ctx, &local->chanctx_list, list) { 375 const struct cfg80211_chan_def *compat; 376 377 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 378 continue; 379 380 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 381 continue; 382 383 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); 384 if (!compat) 385 continue; 386 387 compat = ieee80211_chanctx_reserved_chandef(local, ctx, 388 compat); 389 if (!compat) 390 continue; 391 392 ieee80211_change_chanctx(local, ctx, compat); 393 394 return ctx; 395 } 396 397 return NULL; 398 } 399 400 bool ieee80211_is_radar_required(struct ieee80211_local *local) 401 { 402 struct ieee80211_sub_if_data *sdata; 403 404 lockdep_assert_held(&local->mtx); 405 406 rcu_read_lock(); 407 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 408 if (sdata->radar_required) { 409 rcu_read_unlock(); 410 return true; 411 } 412 } 413 rcu_read_unlock(); 414 415 return false; 416 } 417 418 static bool 419 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 420 struct ieee80211_chanctx *ctx) 421 { 422 struct ieee80211_chanctx_conf *conf = &ctx->conf; 423 struct ieee80211_sub_if_data *sdata; 424 bool required = false; 425 426 lockdep_assert_held(&local->chanctx_mtx); 427 lockdep_assert_held(&local->mtx); 428 429 rcu_read_lock(); 430 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 431 if (!ieee80211_sdata_running(sdata)) 432 continue; 433 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 434 continue; 435 if (!sdata->radar_required) 436 continue; 437 438 required = true; 439 break; 440 } 441 rcu_read_unlock(); 442 443 return required; 444 } 445 446 static struct ieee80211_chanctx * 447 ieee80211_alloc_chanctx(struct ieee80211_local *local, 448 const struct cfg80211_chan_def *chandef, 449 enum ieee80211_chanctx_mode mode) 450 { 451 struct ieee80211_chanctx *ctx; 452 453 lockdep_assert_held(&local->chanctx_mtx); 454 455 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 456 if (!ctx) 457 return NULL; 458 459 INIT_LIST_HEAD(&ctx->assigned_vifs); 460 INIT_LIST_HEAD(&ctx->reserved_vifs); 461 ctx->conf.def = *chandef; 462 ctx->conf.rx_chains_static = 1; 463 ctx->conf.rx_chains_dynamic = 1; 464 ctx->mode = mode; 465 ctx->conf.radar_enabled = false; 466 ieee80211_recalc_chanctx_min_def(local, ctx); 467 468 return ctx; 469 } 470 471 static int ieee80211_add_chanctx(struct ieee80211_local *local, 472 struct ieee80211_chanctx *ctx) 473 { 474 u32 changed; 475 int err; 476 477 lockdep_assert_held(&local->mtx); 478 lockdep_assert_held(&local->chanctx_mtx); 479 480 if (!local->use_chanctx) 481 local->hw.conf.radar_enabled = ctx->conf.radar_enabled; 482 483 /* turn idle off *before* setting channel -- some drivers need that */ 484 changed = ieee80211_idle_off(local); 485 if (changed) 486 ieee80211_hw_config(local, changed); 487 488 if (!local->use_chanctx) { 489 local->_oper_chandef = ctx->conf.def; 490 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 491 } else { 492 err = drv_add_chanctx(local, ctx); 493 if (err) { 494 ieee80211_recalc_idle(local); 495 return err; 496 } 497 } 498 499 return 0; 500 } 501 502 static struct ieee80211_chanctx * 503 ieee80211_new_chanctx(struct ieee80211_local *local, 504 const struct cfg80211_chan_def *chandef, 505 enum ieee80211_chanctx_mode mode) 506 { 507 struct ieee80211_chanctx *ctx; 508 int err; 509 510 lockdep_assert_held(&local->mtx); 511 lockdep_assert_held(&local->chanctx_mtx); 512 513 ctx = ieee80211_alloc_chanctx(local, chandef, mode); 514 if (!ctx) 515 return ERR_PTR(-ENOMEM); 516 517 err = ieee80211_add_chanctx(local, ctx); 518 if (err) { 519 kfree(ctx); 520 return ERR_PTR(err); 521 } 522 523 list_add_rcu(&ctx->list, &local->chanctx_list); 524 return ctx; 525 } 526 527 static void ieee80211_del_chanctx(struct ieee80211_local *local, 528 struct ieee80211_chanctx *ctx) 529 { 530 lockdep_assert_held(&local->chanctx_mtx); 531 532 if (!local->use_chanctx) { 533 struct cfg80211_chan_def *chandef = &local->_oper_chandef; 534 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 535 chandef->center_freq1 = chandef->chan->center_freq; 536 chandef->center_freq2 = 0; 537 538 /* NOTE: Disabling radar is only valid here for 539 * single channel context. To be sure, check it ... 540 */ 541 WARN_ON(local->hw.conf.radar_enabled && 542 !list_empty(&local->chanctx_list)); 543 544 local->hw.conf.radar_enabled = false; 545 546 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 547 } else { 548 drv_remove_chanctx(local, ctx); 549 } 550 551 ieee80211_recalc_idle(local); 552 } 553 554 static void ieee80211_free_chanctx(struct ieee80211_local *local, 555 struct ieee80211_chanctx *ctx) 556 { 557 lockdep_assert_held(&local->chanctx_mtx); 558 559 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 560 561 list_del_rcu(&ctx->list); 562 ieee80211_del_chanctx(local, ctx); 563 kfree_rcu(ctx, rcu_head); 564 } 565 566 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 567 struct ieee80211_chanctx *ctx) 568 { 569 struct ieee80211_chanctx_conf *conf = &ctx->conf; 570 struct ieee80211_sub_if_data *sdata; 571 const struct cfg80211_chan_def *compat = NULL; 572 struct sta_info *sta; 573 574 lockdep_assert_held(&local->chanctx_mtx); 575 576 rcu_read_lock(); 577 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 578 579 if (!ieee80211_sdata_running(sdata)) 580 continue; 581 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 582 continue; 583 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 584 continue; 585 586 if (!compat) 587 compat = &sdata->vif.bss_conf.chandef; 588 589 compat = cfg80211_chandef_compatible( 590 &sdata->vif.bss_conf.chandef, compat); 591 if (WARN_ON_ONCE(!compat)) 592 break; 593 } 594 595 /* TDLS peers can sometimes affect the chandef width */ 596 list_for_each_entry_rcu(sta, &local->sta_list, list) { 597 if (!sta->uploaded || 598 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 599 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 600 !sta->tdls_chandef.chan) 601 continue; 602 603 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 604 compat); 605 if (WARN_ON_ONCE(!compat)) 606 break; 607 } 608 rcu_read_unlock(); 609 610 if (!compat) 611 return; 612 613 ieee80211_change_chanctx(local, ctx, compat); 614 } 615 616 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 617 struct ieee80211_chanctx *chanctx) 618 { 619 bool radar_enabled; 620 621 lockdep_assert_held(&local->chanctx_mtx); 622 /* for ieee80211_is_radar_required */ 623 lockdep_assert_held(&local->mtx); 624 625 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 626 627 if (radar_enabled == chanctx->conf.radar_enabled) 628 return; 629 630 chanctx->conf.radar_enabled = radar_enabled; 631 632 if (!local->use_chanctx) { 633 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 634 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 635 } 636 637 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 638 } 639 640 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 641 struct ieee80211_chanctx *new_ctx) 642 { 643 struct ieee80211_local *local = sdata->local; 644 struct ieee80211_chanctx_conf *conf; 645 struct ieee80211_chanctx *curr_ctx = NULL; 646 int ret = 0; 647 648 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 649 return -ENOTSUPP; 650 651 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 652 lockdep_is_held(&local->chanctx_mtx)); 653 654 if (conf) { 655 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 656 657 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 658 conf = NULL; 659 list_del(&sdata->assigned_chanctx_list); 660 } 661 662 if (new_ctx) { 663 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 664 if (ret) 665 goto out; 666 667 conf = &new_ctx->conf; 668 list_add(&sdata->assigned_chanctx_list, 669 &new_ctx->assigned_vifs); 670 } 671 672 out: 673 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 674 675 sdata->vif.bss_conf.idle = !conf; 676 677 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 678 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 679 ieee80211_recalc_smps_chanctx(local, curr_ctx); 680 ieee80211_recalc_radar_chanctx(local, curr_ctx); 681 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 682 } 683 684 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 685 ieee80211_recalc_txpower(sdata, false); 686 ieee80211_recalc_chanctx_min_def(local, new_ctx); 687 } 688 689 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 690 sdata->vif.type != NL80211_IFTYPE_MONITOR) 691 ieee80211_bss_info_change_notify(sdata, 692 BSS_CHANGED_IDLE); 693 694 ieee80211_check_fast_xmit_iface(sdata); 695 696 return ret; 697 } 698 699 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 700 struct ieee80211_chanctx *chanctx) 701 { 702 struct ieee80211_sub_if_data *sdata; 703 u8 rx_chains_static, rx_chains_dynamic; 704 705 lockdep_assert_held(&local->chanctx_mtx); 706 707 rx_chains_static = 1; 708 rx_chains_dynamic = 1; 709 710 rcu_read_lock(); 711 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 712 u8 needed_static, needed_dynamic; 713 714 if (!ieee80211_sdata_running(sdata)) 715 continue; 716 717 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 718 &chanctx->conf) 719 continue; 720 721 switch (sdata->vif.type) { 722 case NL80211_IFTYPE_P2P_DEVICE: 723 case NL80211_IFTYPE_NAN: 724 continue; 725 case NL80211_IFTYPE_STATION: 726 if (!sdata->u.mgd.associated) 727 continue; 728 break; 729 case NL80211_IFTYPE_AP_VLAN: 730 continue; 731 case NL80211_IFTYPE_AP: 732 case NL80211_IFTYPE_ADHOC: 733 case NL80211_IFTYPE_WDS: 734 case NL80211_IFTYPE_MESH_POINT: 735 case NL80211_IFTYPE_OCB: 736 break; 737 default: 738 WARN_ON_ONCE(1); 739 } 740 741 switch (sdata->smps_mode) { 742 default: 743 WARN_ONCE(1, "Invalid SMPS mode %d\n", 744 sdata->smps_mode); 745 /* fall through */ 746 case IEEE80211_SMPS_OFF: 747 needed_static = sdata->needed_rx_chains; 748 needed_dynamic = sdata->needed_rx_chains; 749 break; 750 case IEEE80211_SMPS_DYNAMIC: 751 needed_static = 1; 752 needed_dynamic = sdata->needed_rx_chains; 753 break; 754 case IEEE80211_SMPS_STATIC: 755 needed_static = 1; 756 needed_dynamic = 1; 757 break; 758 } 759 760 rx_chains_static = max(rx_chains_static, needed_static); 761 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 762 } 763 764 /* Disable SMPS for the monitor interface */ 765 sdata = rcu_dereference(local->monitor_sdata); 766 if (sdata && 767 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 768 rx_chains_dynamic = rx_chains_static = local->rx_chains; 769 770 rcu_read_unlock(); 771 772 if (!local->use_chanctx) { 773 if (rx_chains_static > 1) 774 local->smps_mode = IEEE80211_SMPS_OFF; 775 else if (rx_chains_dynamic > 1) 776 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 777 else 778 local->smps_mode = IEEE80211_SMPS_STATIC; 779 ieee80211_hw_config(local, 0); 780 } 781 782 if (rx_chains_static == chanctx->conf.rx_chains_static && 783 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 784 return; 785 786 chanctx->conf.rx_chains_static = rx_chains_static; 787 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 788 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 789 } 790 791 static void 792 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 793 bool clear) 794 { 795 struct ieee80211_local *local __maybe_unused = sdata->local; 796 struct ieee80211_sub_if_data *vlan; 797 struct ieee80211_chanctx_conf *conf; 798 799 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 800 return; 801 802 lockdep_assert_held(&local->mtx); 803 804 /* Check that conf exists, even when clearing this function 805 * must be called with the AP's channel context still there 806 * as it would otherwise cause VLANs to have an invalid 807 * channel context pointer for a while, possibly pointing 808 * to a channel context that has already been freed. 809 */ 810 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 811 lockdep_is_held(&local->chanctx_mtx)); 812 WARN_ON(!conf); 813 814 if (clear) 815 conf = NULL; 816 817 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 818 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 819 } 820 821 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 822 bool clear) 823 { 824 struct ieee80211_local *local = sdata->local; 825 826 mutex_lock(&local->chanctx_mtx); 827 828 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 829 830 mutex_unlock(&local->chanctx_mtx); 831 } 832 833 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 834 { 835 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 836 837 lockdep_assert_held(&sdata->local->chanctx_mtx); 838 839 if (WARN_ON(!ctx)) 840 return -EINVAL; 841 842 list_del(&sdata->reserved_chanctx_list); 843 sdata->reserved_chanctx = NULL; 844 845 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 846 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 847 if (WARN_ON(!ctx->replace_ctx)) 848 return -EINVAL; 849 850 WARN_ON(ctx->replace_ctx->replace_state != 851 IEEE80211_CHANCTX_WILL_BE_REPLACED); 852 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 853 854 ctx->replace_ctx->replace_ctx = NULL; 855 ctx->replace_ctx->replace_state = 856 IEEE80211_CHANCTX_REPLACE_NONE; 857 858 list_del_rcu(&ctx->list); 859 kfree_rcu(ctx, rcu_head); 860 } else { 861 ieee80211_free_chanctx(sdata->local, ctx); 862 } 863 } 864 865 return 0; 866 } 867 868 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 869 const struct cfg80211_chan_def *chandef, 870 enum ieee80211_chanctx_mode mode, 871 bool radar_required) 872 { 873 struct ieee80211_local *local = sdata->local; 874 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 875 876 lockdep_assert_held(&local->chanctx_mtx); 877 878 curr_ctx = ieee80211_vif_get_chanctx(sdata); 879 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 880 return -ENOTSUPP; 881 882 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 883 if (!new_ctx) { 884 if (ieee80211_can_create_new_chanctx(local)) { 885 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 886 if (IS_ERR(new_ctx)) 887 return PTR_ERR(new_ctx); 888 } else { 889 if (!curr_ctx || 890 (curr_ctx->replace_state == 891 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 892 !list_empty(&curr_ctx->reserved_vifs)) { 893 /* 894 * Another vif already requested this context 895 * for a reservation. Find another one hoping 896 * all vifs assigned to it will also switch 897 * soon enough. 898 * 899 * TODO: This needs a little more work as some 900 * cases (more than 2 chanctx capable devices) 901 * may fail which could otherwise succeed 902 * provided some channel context juggling was 903 * performed. 904 * 905 * Consider ctx1..3, vif1..6, each ctx has 2 906 * vifs. vif1 and vif2 from ctx1 request new 907 * different chandefs starting 2 in-place 908 * reserations with ctx4 and ctx5 replacing 909 * ctx1 and ctx2 respectively. Next vif5 and 910 * vif6 from ctx3 reserve ctx4. If vif3 and 911 * vif4 remain on ctx2 as they are then this 912 * fails unless `replace_ctx` from ctx5 is 913 * replaced with ctx3. 914 */ 915 list_for_each_entry(ctx, &local->chanctx_list, 916 list) { 917 if (ctx->replace_state != 918 IEEE80211_CHANCTX_REPLACE_NONE) 919 continue; 920 921 if (!list_empty(&ctx->reserved_vifs)) 922 continue; 923 924 curr_ctx = ctx; 925 break; 926 } 927 } 928 929 /* 930 * If that's true then all available contexts already 931 * have reservations and cannot be used. 932 */ 933 if (!curr_ctx || 934 (curr_ctx->replace_state == 935 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 936 !list_empty(&curr_ctx->reserved_vifs)) 937 return -EBUSY; 938 939 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 940 if (!new_ctx) 941 return -ENOMEM; 942 943 new_ctx->replace_ctx = curr_ctx; 944 new_ctx->replace_state = 945 IEEE80211_CHANCTX_REPLACES_OTHER; 946 947 curr_ctx->replace_ctx = new_ctx; 948 curr_ctx->replace_state = 949 IEEE80211_CHANCTX_WILL_BE_REPLACED; 950 951 list_add_rcu(&new_ctx->list, &local->chanctx_list); 952 } 953 } 954 955 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 956 sdata->reserved_chanctx = new_ctx; 957 sdata->reserved_chandef = *chandef; 958 sdata->reserved_radar_required = radar_required; 959 sdata->reserved_ready = false; 960 961 return 0; 962 } 963 964 static void 965 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 966 { 967 switch (sdata->vif.type) { 968 case NL80211_IFTYPE_ADHOC: 969 case NL80211_IFTYPE_AP: 970 case NL80211_IFTYPE_MESH_POINT: 971 case NL80211_IFTYPE_OCB: 972 ieee80211_queue_work(&sdata->local->hw, 973 &sdata->csa_finalize_work); 974 break; 975 case NL80211_IFTYPE_STATION: 976 ieee80211_queue_work(&sdata->local->hw, 977 &sdata->u.mgd.chswitch_work); 978 break; 979 case NL80211_IFTYPE_UNSPECIFIED: 980 case NL80211_IFTYPE_AP_VLAN: 981 case NL80211_IFTYPE_WDS: 982 case NL80211_IFTYPE_MONITOR: 983 case NL80211_IFTYPE_P2P_CLIENT: 984 case NL80211_IFTYPE_P2P_GO: 985 case NL80211_IFTYPE_P2P_DEVICE: 986 case NL80211_IFTYPE_NAN: 987 case NUM_NL80211_IFTYPES: 988 WARN_ON(1); 989 break; 990 } 991 } 992 993 static void 994 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 995 const struct cfg80211_chan_def *chandef) 996 { 997 struct ieee80211_sub_if_data *vlan; 998 999 sdata->vif.bss_conf.chandef = *chandef; 1000 1001 if (sdata->vif.type != NL80211_IFTYPE_AP) 1002 return; 1003 1004 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1005 vlan->vif.bss_conf.chandef = *chandef; 1006 } 1007 1008 static int 1009 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1010 { 1011 struct ieee80211_local *local = sdata->local; 1012 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1013 struct ieee80211_chanctx *old_ctx, *new_ctx; 1014 const struct cfg80211_chan_def *chandef; 1015 u32 changed = 0; 1016 int err; 1017 1018 lockdep_assert_held(&local->mtx); 1019 lockdep_assert_held(&local->chanctx_mtx); 1020 1021 new_ctx = sdata->reserved_chanctx; 1022 old_ctx = ieee80211_vif_get_chanctx(sdata); 1023 1024 if (WARN_ON(!sdata->reserved_ready)) 1025 return -EBUSY; 1026 1027 if (WARN_ON(!new_ctx)) 1028 return -EINVAL; 1029 1030 if (WARN_ON(!old_ctx)) 1031 return -EINVAL; 1032 1033 if (WARN_ON(new_ctx->replace_state == 1034 IEEE80211_CHANCTX_REPLACES_OTHER)) 1035 return -EINVAL; 1036 1037 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1038 &sdata->reserved_chandef); 1039 if (WARN_ON(!chandef)) 1040 return -EINVAL; 1041 1042 ieee80211_change_chanctx(local, new_ctx, chandef); 1043 1044 vif_chsw[0].vif = &sdata->vif; 1045 vif_chsw[0].old_ctx = &old_ctx->conf; 1046 vif_chsw[0].new_ctx = &new_ctx->conf; 1047 1048 list_del(&sdata->reserved_chanctx_list); 1049 sdata->reserved_chanctx = NULL; 1050 1051 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1052 CHANCTX_SWMODE_REASSIGN_VIF); 1053 if (err) { 1054 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1055 ieee80211_free_chanctx(local, new_ctx); 1056 1057 goto out; 1058 } 1059 1060 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1061 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1062 1063 if (sdata->vif.type == NL80211_IFTYPE_AP) 1064 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1065 1066 ieee80211_check_fast_xmit_iface(sdata); 1067 1068 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1069 ieee80211_free_chanctx(local, old_ctx); 1070 1071 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1072 changed = BSS_CHANGED_BANDWIDTH; 1073 1074 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1075 1076 ieee80211_recalc_smps_chanctx(local, new_ctx); 1077 ieee80211_recalc_radar_chanctx(local, new_ctx); 1078 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1079 1080 if (changed) 1081 ieee80211_bss_info_change_notify(sdata, changed); 1082 1083 out: 1084 ieee80211_vif_chanctx_reservation_complete(sdata); 1085 return err; 1086 } 1087 1088 static int 1089 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1090 { 1091 struct ieee80211_local *local = sdata->local; 1092 struct ieee80211_chanctx *old_ctx, *new_ctx; 1093 const struct cfg80211_chan_def *chandef; 1094 int err; 1095 1096 old_ctx = ieee80211_vif_get_chanctx(sdata); 1097 new_ctx = sdata->reserved_chanctx; 1098 1099 if (WARN_ON(!sdata->reserved_ready)) 1100 return -EINVAL; 1101 1102 if (WARN_ON(old_ctx)) 1103 return -EINVAL; 1104 1105 if (WARN_ON(!new_ctx)) 1106 return -EINVAL; 1107 1108 if (WARN_ON(new_ctx->replace_state == 1109 IEEE80211_CHANCTX_REPLACES_OTHER)) 1110 return -EINVAL; 1111 1112 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1113 &sdata->reserved_chandef); 1114 if (WARN_ON(!chandef)) 1115 return -EINVAL; 1116 1117 ieee80211_change_chanctx(local, new_ctx, chandef); 1118 1119 list_del(&sdata->reserved_chanctx_list); 1120 sdata->reserved_chanctx = NULL; 1121 1122 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1123 if (err) { 1124 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1125 ieee80211_free_chanctx(local, new_ctx); 1126 1127 goto out; 1128 } 1129 1130 out: 1131 ieee80211_vif_chanctx_reservation_complete(sdata); 1132 return err; 1133 } 1134 1135 static bool 1136 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1137 { 1138 struct ieee80211_chanctx *old_ctx, *new_ctx; 1139 1140 lockdep_assert_held(&sdata->local->chanctx_mtx); 1141 1142 new_ctx = sdata->reserved_chanctx; 1143 old_ctx = ieee80211_vif_get_chanctx(sdata); 1144 1145 if (!old_ctx) 1146 return false; 1147 1148 if (WARN_ON(!new_ctx)) 1149 return false; 1150 1151 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1152 return false; 1153 1154 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1155 return false; 1156 1157 return true; 1158 } 1159 1160 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1161 struct ieee80211_chanctx *new_ctx) 1162 { 1163 const struct cfg80211_chan_def *chandef; 1164 1165 lockdep_assert_held(&local->mtx); 1166 lockdep_assert_held(&local->chanctx_mtx); 1167 1168 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1169 if (WARN_ON(!chandef)) 1170 return -EINVAL; 1171 1172 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1173 local->_oper_chandef = *chandef; 1174 ieee80211_hw_config(local, 0); 1175 1176 return 0; 1177 } 1178 1179 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1180 int n_vifs) 1181 { 1182 struct ieee80211_vif_chanctx_switch *vif_chsw; 1183 struct ieee80211_sub_if_data *sdata; 1184 struct ieee80211_chanctx *ctx, *old_ctx; 1185 int i, err; 1186 1187 lockdep_assert_held(&local->mtx); 1188 lockdep_assert_held(&local->chanctx_mtx); 1189 1190 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1191 if (!vif_chsw) 1192 return -ENOMEM; 1193 1194 i = 0; 1195 list_for_each_entry(ctx, &local->chanctx_list, list) { 1196 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1197 continue; 1198 1199 if (WARN_ON(!ctx->replace_ctx)) { 1200 err = -EINVAL; 1201 goto out; 1202 } 1203 1204 list_for_each_entry(sdata, &ctx->reserved_vifs, 1205 reserved_chanctx_list) { 1206 if (!ieee80211_vif_has_in_place_reservation( 1207 sdata)) 1208 continue; 1209 1210 old_ctx = ieee80211_vif_get_chanctx(sdata); 1211 vif_chsw[i].vif = &sdata->vif; 1212 vif_chsw[i].old_ctx = &old_ctx->conf; 1213 vif_chsw[i].new_ctx = &ctx->conf; 1214 1215 i++; 1216 } 1217 } 1218 1219 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1220 CHANCTX_SWMODE_SWAP_CONTEXTS); 1221 1222 out: 1223 kfree(vif_chsw); 1224 return err; 1225 } 1226 1227 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1228 { 1229 struct ieee80211_chanctx *ctx; 1230 int err; 1231 1232 lockdep_assert_held(&local->mtx); 1233 lockdep_assert_held(&local->chanctx_mtx); 1234 1235 list_for_each_entry(ctx, &local->chanctx_list, list) { 1236 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1237 continue; 1238 1239 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1240 continue; 1241 1242 ieee80211_del_chanctx(local, ctx->replace_ctx); 1243 err = ieee80211_add_chanctx(local, ctx); 1244 if (err) 1245 goto err; 1246 } 1247 1248 return 0; 1249 1250 err: 1251 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1252 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1253 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1254 continue; 1255 1256 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1257 continue; 1258 1259 ieee80211_del_chanctx(local, ctx); 1260 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1261 } 1262 1263 return err; 1264 } 1265 1266 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1267 { 1268 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1269 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1270 struct ieee80211_chanctx *new_ctx = NULL; 1271 int err, n_assigned, n_reserved, n_ready; 1272 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1273 1274 lockdep_assert_held(&local->mtx); 1275 lockdep_assert_held(&local->chanctx_mtx); 1276 1277 /* 1278 * If there are 2 independent pairs of channel contexts performing 1279 * cross-switch of their vifs this code will still wait until both are 1280 * ready even though it could be possible to switch one before the 1281 * other is ready. 1282 * 1283 * For practical reasons and code simplicity just do a single huge 1284 * switch. 1285 */ 1286 1287 /* 1288 * Verify if the reservation is still feasible. 1289 * - if it's not then disconnect 1290 * - if it is but not all vifs necessary are ready then defer 1291 */ 1292 1293 list_for_each_entry(ctx, &local->chanctx_list, list) { 1294 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1295 continue; 1296 1297 if (WARN_ON(!ctx->replace_ctx)) { 1298 err = -EINVAL; 1299 goto err; 1300 } 1301 1302 if (!local->use_chanctx) 1303 new_ctx = ctx; 1304 1305 n_ctx++; 1306 1307 n_assigned = 0; 1308 n_reserved = 0; 1309 n_ready = 0; 1310 1311 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1312 assigned_chanctx_list) { 1313 n_assigned++; 1314 if (sdata->reserved_chanctx) { 1315 n_reserved++; 1316 if (sdata->reserved_ready) 1317 n_ready++; 1318 } 1319 } 1320 1321 if (n_assigned != n_reserved) { 1322 if (n_ready == n_reserved) { 1323 wiphy_info(local->hw.wiphy, 1324 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1325 err = -EBUSY; 1326 goto err; 1327 } 1328 1329 return -EAGAIN; 1330 } 1331 1332 ctx->conf.radar_enabled = false; 1333 list_for_each_entry(sdata, &ctx->reserved_vifs, 1334 reserved_chanctx_list) { 1335 if (ieee80211_vif_has_in_place_reservation(sdata) && 1336 !sdata->reserved_ready) 1337 return -EAGAIN; 1338 1339 old_ctx = ieee80211_vif_get_chanctx(sdata); 1340 if (old_ctx) { 1341 if (old_ctx->replace_state == 1342 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1343 n_vifs_switch++; 1344 else 1345 n_vifs_assign++; 1346 } else { 1347 n_vifs_ctxless++; 1348 } 1349 1350 if (sdata->reserved_radar_required) 1351 ctx->conf.radar_enabled = true; 1352 } 1353 } 1354 1355 if (WARN_ON(n_ctx == 0) || 1356 WARN_ON(n_vifs_switch == 0 && 1357 n_vifs_assign == 0 && 1358 n_vifs_ctxless == 0) || 1359 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1360 WARN_ON(!new_ctx && !local->use_chanctx)) { 1361 err = -EINVAL; 1362 goto err; 1363 } 1364 1365 /* 1366 * All necessary vifs are ready. Perform the switch now depending on 1367 * reservations and driver capabilities. 1368 */ 1369 1370 if (local->use_chanctx) { 1371 if (n_vifs_switch > 0) { 1372 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1373 if (err) 1374 goto err; 1375 } 1376 1377 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1378 err = ieee80211_chsw_switch_ctxs(local); 1379 if (err) 1380 goto err; 1381 } 1382 } else { 1383 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1384 if (err) 1385 goto err; 1386 } 1387 1388 /* 1389 * Update all structures, values and pointers to point to new channel 1390 * context(s). 1391 */ 1392 list_for_each_entry(ctx, &local->chanctx_list, list) { 1393 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1394 continue; 1395 1396 if (WARN_ON(!ctx->replace_ctx)) { 1397 err = -EINVAL; 1398 goto err; 1399 } 1400 1401 list_for_each_entry(sdata, &ctx->reserved_vifs, 1402 reserved_chanctx_list) { 1403 u32 changed = 0; 1404 1405 if (!ieee80211_vif_has_in_place_reservation(sdata)) 1406 continue; 1407 1408 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); 1409 1410 if (sdata->vif.type == NL80211_IFTYPE_AP) 1411 __ieee80211_vif_copy_chanctx_to_vlans(sdata, 1412 false); 1413 1414 ieee80211_check_fast_xmit_iface(sdata); 1415 1416 sdata->radar_required = sdata->reserved_radar_required; 1417 1418 if (sdata->vif.bss_conf.chandef.width != 1419 sdata->reserved_chandef.width) 1420 changed = BSS_CHANGED_BANDWIDTH; 1421 1422 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1423 if (changed) 1424 ieee80211_bss_info_change_notify(sdata, 1425 changed); 1426 1427 ieee80211_recalc_txpower(sdata, false); 1428 } 1429 1430 ieee80211_recalc_chanctx_chantype(local, ctx); 1431 ieee80211_recalc_smps_chanctx(local, ctx); 1432 ieee80211_recalc_radar_chanctx(local, ctx); 1433 ieee80211_recalc_chanctx_min_def(local, ctx); 1434 1435 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1436 reserved_chanctx_list) { 1437 if (ieee80211_vif_get_chanctx(sdata) != ctx) 1438 continue; 1439 1440 list_del(&sdata->reserved_chanctx_list); 1441 list_move(&sdata->assigned_chanctx_list, 1442 &ctx->assigned_vifs); 1443 sdata->reserved_chanctx = NULL; 1444 1445 ieee80211_vif_chanctx_reservation_complete(sdata); 1446 } 1447 1448 /* 1449 * This context might have been a dependency for an already 1450 * ready re-assign reservation interface that was deferred. Do 1451 * not propagate error to the caller though. The in-place 1452 * reservation for originally requested interface has already 1453 * succeeded at this point. 1454 */ 1455 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1456 reserved_chanctx_list) { 1457 if (WARN_ON(ieee80211_vif_has_in_place_reservation( 1458 sdata))) 1459 continue; 1460 1461 if (WARN_ON(sdata->reserved_chanctx != ctx)) 1462 continue; 1463 1464 if (!sdata->reserved_ready) 1465 continue; 1466 1467 if (ieee80211_vif_get_chanctx(sdata)) 1468 err = ieee80211_vif_use_reserved_reassign( 1469 sdata); 1470 else 1471 err = ieee80211_vif_use_reserved_assign(sdata); 1472 1473 if (err) { 1474 sdata_info(sdata, 1475 "failed to finalize (re-)assign reservation (err=%d)\n", 1476 err); 1477 ieee80211_vif_unreserve_chanctx(sdata); 1478 cfg80211_stop_iface(local->hw.wiphy, 1479 &sdata->wdev, 1480 GFP_KERNEL); 1481 } 1482 } 1483 } 1484 1485 /* 1486 * Finally free old contexts 1487 */ 1488 1489 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1490 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1491 continue; 1492 1493 ctx->replace_ctx->replace_ctx = NULL; 1494 ctx->replace_ctx->replace_state = 1495 IEEE80211_CHANCTX_REPLACE_NONE; 1496 1497 list_del_rcu(&ctx->list); 1498 kfree_rcu(ctx, rcu_head); 1499 } 1500 1501 return 0; 1502 1503 err: 1504 list_for_each_entry(ctx, &local->chanctx_list, list) { 1505 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1506 continue; 1507 1508 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs, 1509 reserved_chanctx_list) { 1510 ieee80211_vif_unreserve_chanctx(sdata); 1511 ieee80211_vif_chanctx_reservation_complete(sdata); 1512 } 1513 } 1514 1515 return err; 1516 } 1517 1518 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1519 { 1520 struct ieee80211_local *local = sdata->local; 1521 struct ieee80211_chanctx_conf *conf; 1522 struct ieee80211_chanctx *ctx; 1523 bool use_reserved_switch = false; 1524 1525 lockdep_assert_held(&local->chanctx_mtx); 1526 1527 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1528 lockdep_is_held(&local->chanctx_mtx)); 1529 if (!conf) 1530 return; 1531 1532 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1533 1534 if (sdata->reserved_chanctx) { 1535 if (sdata->reserved_chanctx->replace_state == 1536 IEEE80211_CHANCTX_REPLACES_OTHER && 1537 ieee80211_chanctx_num_reserved(local, 1538 sdata->reserved_chanctx) > 1) 1539 use_reserved_switch = true; 1540 1541 ieee80211_vif_unreserve_chanctx(sdata); 1542 } 1543 1544 ieee80211_assign_vif_chanctx(sdata, NULL); 1545 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1546 ieee80211_free_chanctx(local, ctx); 1547 1548 sdata->radar_required = false; 1549 1550 /* Unreserving may ready an in-place reservation. */ 1551 if (use_reserved_switch) 1552 ieee80211_vif_use_reserved_switch(local); 1553 } 1554 1555 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 1556 const struct cfg80211_chan_def *chandef, 1557 enum ieee80211_chanctx_mode mode) 1558 { 1559 struct ieee80211_local *local = sdata->local; 1560 struct ieee80211_chanctx *ctx; 1561 u8 radar_detect_width = 0; 1562 int ret; 1563 1564 lockdep_assert_held(&local->mtx); 1565 1566 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1567 1568 mutex_lock(&local->chanctx_mtx); 1569 1570 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1571 chandef, 1572 sdata->wdev.iftype); 1573 if (ret < 0) 1574 goto out; 1575 if (ret > 0) 1576 radar_detect_width = BIT(chandef->width); 1577 1578 sdata->radar_required = ret; 1579 1580 ret = ieee80211_check_combinations(sdata, chandef, mode, 1581 radar_detect_width); 1582 if (ret < 0) 1583 goto out; 1584 1585 __ieee80211_vif_release_channel(sdata); 1586 1587 ctx = ieee80211_find_chanctx(local, chandef, mode); 1588 if (!ctx) 1589 ctx = ieee80211_new_chanctx(local, chandef, mode); 1590 if (IS_ERR(ctx)) { 1591 ret = PTR_ERR(ctx); 1592 goto out; 1593 } 1594 1595 ieee80211_vif_update_chandef(sdata, chandef); 1596 1597 ret = ieee80211_assign_vif_chanctx(sdata, ctx); 1598 if (ret) { 1599 /* if assign fails refcount stays the same */ 1600 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1601 ieee80211_free_chanctx(local, ctx); 1602 goto out; 1603 } 1604 1605 ieee80211_recalc_smps_chanctx(local, ctx); 1606 ieee80211_recalc_radar_chanctx(local, ctx); 1607 out: 1608 if (ret) 1609 sdata->radar_required = false; 1610 1611 mutex_unlock(&local->chanctx_mtx); 1612 return ret; 1613 } 1614 1615 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata) 1616 { 1617 struct ieee80211_local *local = sdata->local; 1618 struct ieee80211_chanctx *new_ctx; 1619 struct ieee80211_chanctx *old_ctx; 1620 int err; 1621 1622 lockdep_assert_held(&local->mtx); 1623 lockdep_assert_held(&local->chanctx_mtx); 1624 1625 new_ctx = sdata->reserved_chanctx; 1626 old_ctx = ieee80211_vif_get_chanctx(sdata); 1627 1628 if (WARN_ON(!new_ctx)) 1629 return -EINVAL; 1630 1631 if (WARN_ON(new_ctx->replace_state == 1632 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1633 return -EINVAL; 1634 1635 if (WARN_ON(sdata->reserved_ready)) 1636 return -EINVAL; 1637 1638 sdata->reserved_ready = true; 1639 1640 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1641 if (old_ctx) 1642 err = ieee80211_vif_use_reserved_reassign(sdata); 1643 else 1644 err = ieee80211_vif_use_reserved_assign(sdata); 1645 1646 if (err) 1647 return err; 1648 } 1649 1650 /* 1651 * In-place reservation may need to be finalized now either if: 1652 * a) sdata is taking part in the swapping itself and is the last one 1653 * b) sdata has switched with a re-assign reservation to an existing 1654 * context readying in-place switching of old_ctx 1655 * 1656 * In case of (b) do not propagate the error up because the requested 1657 * sdata already switched successfully. Just spill an extra warning. 1658 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1659 * interfaces upon failure. 1660 */ 1661 if ((old_ctx && 1662 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1663 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1664 err = ieee80211_vif_use_reserved_switch(local); 1665 if (err && err != -EAGAIN) { 1666 if (new_ctx->replace_state == 1667 IEEE80211_CHANCTX_REPLACES_OTHER) 1668 return err; 1669 1670 wiphy_info(local->hw.wiphy, 1671 "depending in-place reservation failed (err=%d)\n", 1672 err); 1673 } 1674 } 1675 1676 return 0; 1677 } 1678 1679 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, 1680 const struct cfg80211_chan_def *chandef, 1681 u32 *changed) 1682 { 1683 struct ieee80211_local *local = sdata->local; 1684 struct ieee80211_chanctx_conf *conf; 1685 struct ieee80211_chanctx *ctx; 1686 const struct cfg80211_chan_def *compat; 1687 int ret; 1688 1689 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, 1690 IEEE80211_CHAN_DISABLED)) 1691 return -EINVAL; 1692 1693 mutex_lock(&local->chanctx_mtx); 1694 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { 1695 ret = 0; 1696 goto out; 1697 } 1698 1699 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || 1700 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { 1701 ret = -EINVAL; 1702 goto out; 1703 } 1704 1705 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 1706 lockdep_is_held(&local->chanctx_mtx)); 1707 if (!conf) { 1708 ret = -EINVAL; 1709 goto out; 1710 } 1711 1712 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1713 1714 compat = cfg80211_chandef_compatible(&conf->def, chandef); 1715 if (!compat) { 1716 ret = -EINVAL; 1717 goto out; 1718 } 1719 1720 switch (ctx->replace_state) { 1721 case IEEE80211_CHANCTX_REPLACE_NONE: 1722 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) { 1723 ret = -EBUSY; 1724 goto out; 1725 } 1726 break; 1727 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 1728 /* TODO: Perhaps the bandwidth change could be treated as a 1729 * reservation itself? */ 1730 ret = -EBUSY; 1731 goto out; 1732 case IEEE80211_CHANCTX_REPLACES_OTHER: 1733 /* channel context that is going to replace another channel 1734 * context doesn't really exist and shouldn't be assigned 1735 * anywhere yet */ 1736 WARN_ON(1); 1737 break; 1738 } 1739 1740 ieee80211_vif_update_chandef(sdata, chandef); 1741 1742 ieee80211_recalc_chanctx_chantype(local, ctx); 1743 1744 *changed |= BSS_CHANGED_BANDWIDTH; 1745 ret = 0; 1746 out: 1747 mutex_unlock(&local->chanctx_mtx); 1748 return ret; 1749 } 1750 1751 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 1752 { 1753 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); 1754 1755 lockdep_assert_held(&sdata->local->mtx); 1756 1757 mutex_lock(&sdata->local->chanctx_mtx); 1758 __ieee80211_vif_release_channel(sdata); 1759 mutex_unlock(&sdata->local->chanctx_mtx); 1760 } 1761 1762 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) 1763 { 1764 struct ieee80211_local *local = sdata->local; 1765 struct ieee80211_sub_if_data *ap; 1766 struct ieee80211_chanctx_conf *conf; 1767 1768 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 1769 return; 1770 1771 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1772 1773 mutex_lock(&local->chanctx_mtx); 1774 1775 conf = rcu_dereference_protected(ap->vif.chanctx_conf, 1776 lockdep_is_held(&local->chanctx_mtx)); 1777 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 1778 mutex_unlock(&local->chanctx_mtx); 1779 } 1780 1781 void ieee80211_iter_chan_contexts_atomic( 1782 struct ieee80211_hw *hw, 1783 void (*iter)(struct ieee80211_hw *hw, 1784 struct ieee80211_chanctx_conf *chanctx_conf, 1785 void *data), 1786 void *iter_data) 1787 { 1788 struct ieee80211_local *local = hw_to_local(hw); 1789 struct ieee80211_chanctx *ctx; 1790 1791 rcu_read_lock(); 1792 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 1793 if (ctx->driver_present) 1794 iter(hw, &ctx->conf, iter_data); 1795 rcu_read_unlock(); 1796 } 1797 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 1798