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->freq1_offset = chandef->chan->freq_offset; 537 chandef->center_freq2 = 0; 538 539 /* NOTE: Disabling radar is only valid here for 540 * single channel context. To be sure, check it ... 541 */ 542 WARN_ON(local->hw.conf.radar_enabled && 543 !list_empty(&local->chanctx_list)); 544 545 local->hw.conf.radar_enabled = false; 546 547 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 548 } else { 549 drv_remove_chanctx(local, ctx); 550 } 551 552 ieee80211_recalc_idle(local); 553 } 554 555 static void ieee80211_free_chanctx(struct ieee80211_local *local, 556 struct ieee80211_chanctx *ctx) 557 { 558 lockdep_assert_held(&local->chanctx_mtx); 559 560 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 561 562 list_del_rcu(&ctx->list); 563 ieee80211_del_chanctx(local, ctx); 564 kfree_rcu(ctx, rcu_head); 565 } 566 567 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 568 struct ieee80211_chanctx *ctx) 569 { 570 struct ieee80211_chanctx_conf *conf = &ctx->conf; 571 struct ieee80211_sub_if_data *sdata; 572 const struct cfg80211_chan_def *compat = NULL; 573 struct sta_info *sta; 574 575 lockdep_assert_held(&local->chanctx_mtx); 576 577 rcu_read_lock(); 578 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 579 580 if (!ieee80211_sdata_running(sdata)) 581 continue; 582 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) 583 continue; 584 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 585 continue; 586 587 if (!compat) 588 compat = &sdata->vif.bss_conf.chandef; 589 590 compat = cfg80211_chandef_compatible( 591 &sdata->vif.bss_conf.chandef, compat); 592 if (WARN_ON_ONCE(!compat)) 593 break; 594 } 595 596 /* TDLS peers can sometimes affect the chandef width */ 597 list_for_each_entry_rcu(sta, &local->sta_list, list) { 598 if (!sta->uploaded || 599 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 600 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 601 !sta->tdls_chandef.chan) 602 continue; 603 604 compat = cfg80211_chandef_compatible(&sta->tdls_chandef, 605 compat); 606 if (WARN_ON_ONCE(!compat)) 607 break; 608 } 609 rcu_read_unlock(); 610 611 if (!compat) 612 return; 613 614 ieee80211_change_chanctx(local, ctx, compat); 615 } 616 617 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 618 struct ieee80211_chanctx *chanctx) 619 { 620 bool radar_enabled; 621 622 lockdep_assert_held(&local->chanctx_mtx); 623 /* for ieee80211_is_radar_required */ 624 lockdep_assert_held(&local->mtx); 625 626 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 627 628 if (radar_enabled == chanctx->conf.radar_enabled) 629 return; 630 631 chanctx->conf.radar_enabled = radar_enabled; 632 633 if (!local->use_chanctx) { 634 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; 635 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); 636 } 637 638 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 639 } 640 641 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 642 struct ieee80211_chanctx *new_ctx) 643 { 644 struct ieee80211_local *local = sdata->local; 645 struct ieee80211_chanctx_conf *conf; 646 struct ieee80211_chanctx *curr_ctx = NULL; 647 int ret = 0; 648 649 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 650 return -ENOTSUPP; 651 652 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 653 lockdep_is_held(&local->chanctx_mtx)); 654 655 if (conf) { 656 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 657 658 drv_unassign_vif_chanctx(local, sdata, curr_ctx); 659 conf = NULL; 660 list_del(&sdata->assigned_chanctx_list); 661 } 662 663 if (new_ctx) { 664 ret = drv_assign_vif_chanctx(local, sdata, new_ctx); 665 if (ret) 666 goto out; 667 668 conf = &new_ctx->conf; 669 list_add(&sdata->assigned_chanctx_list, 670 &new_ctx->assigned_vifs); 671 } 672 673 out: 674 rcu_assign_pointer(sdata->vif.chanctx_conf, conf); 675 676 sdata->vif.bss_conf.idle = !conf; 677 678 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 679 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 680 ieee80211_recalc_smps_chanctx(local, curr_ctx); 681 ieee80211_recalc_radar_chanctx(local, curr_ctx); 682 ieee80211_recalc_chanctx_min_def(local, curr_ctx); 683 } 684 685 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 686 ieee80211_recalc_txpower(sdata, false); 687 ieee80211_recalc_chanctx_min_def(local, new_ctx); 688 } 689 690 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 691 sdata->vif.type != NL80211_IFTYPE_MONITOR) 692 ieee80211_bss_info_change_notify(sdata, 693 BSS_CHANGED_IDLE); 694 695 ieee80211_check_fast_xmit_iface(sdata); 696 697 return ret; 698 } 699 700 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 701 struct ieee80211_chanctx *chanctx) 702 { 703 struct ieee80211_sub_if_data *sdata; 704 u8 rx_chains_static, rx_chains_dynamic; 705 706 lockdep_assert_held(&local->chanctx_mtx); 707 708 rx_chains_static = 1; 709 rx_chains_dynamic = 1; 710 711 rcu_read_lock(); 712 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 713 u8 needed_static, needed_dynamic; 714 715 if (!ieee80211_sdata_running(sdata)) 716 continue; 717 718 if (rcu_access_pointer(sdata->vif.chanctx_conf) != 719 &chanctx->conf) 720 continue; 721 722 switch (sdata->vif.type) { 723 case NL80211_IFTYPE_P2P_DEVICE: 724 case NL80211_IFTYPE_NAN: 725 continue; 726 case NL80211_IFTYPE_STATION: 727 if (!sdata->u.mgd.associated) 728 continue; 729 break; 730 case NL80211_IFTYPE_AP_VLAN: 731 continue; 732 case NL80211_IFTYPE_AP: 733 case NL80211_IFTYPE_ADHOC: 734 case NL80211_IFTYPE_WDS: 735 case NL80211_IFTYPE_MESH_POINT: 736 case NL80211_IFTYPE_OCB: 737 break; 738 default: 739 WARN_ON_ONCE(1); 740 } 741 742 switch (sdata->smps_mode) { 743 default: 744 WARN_ONCE(1, "Invalid SMPS mode %d\n", 745 sdata->smps_mode); 746 /* fall through */ 747 case IEEE80211_SMPS_OFF: 748 needed_static = sdata->needed_rx_chains; 749 needed_dynamic = sdata->needed_rx_chains; 750 break; 751 case IEEE80211_SMPS_DYNAMIC: 752 needed_static = 1; 753 needed_dynamic = sdata->needed_rx_chains; 754 break; 755 case IEEE80211_SMPS_STATIC: 756 needed_static = 1; 757 needed_dynamic = 1; 758 break; 759 } 760 761 rx_chains_static = max(rx_chains_static, needed_static); 762 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 763 } 764 765 /* Disable SMPS for the monitor interface */ 766 sdata = rcu_dereference(local->monitor_sdata); 767 if (sdata && 768 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf) 769 rx_chains_dynamic = rx_chains_static = local->rx_chains; 770 771 rcu_read_unlock(); 772 773 if (!local->use_chanctx) { 774 if (rx_chains_static > 1) 775 local->smps_mode = IEEE80211_SMPS_OFF; 776 else if (rx_chains_dynamic > 1) 777 local->smps_mode = IEEE80211_SMPS_DYNAMIC; 778 else 779 local->smps_mode = IEEE80211_SMPS_STATIC; 780 ieee80211_hw_config(local, 0); 781 } 782 783 if (rx_chains_static == chanctx->conf.rx_chains_static && 784 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 785 return; 786 787 chanctx->conf.rx_chains_static = rx_chains_static; 788 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 789 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 790 } 791 792 static void 793 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 794 bool clear) 795 { 796 struct ieee80211_local *local __maybe_unused = sdata->local; 797 struct ieee80211_sub_if_data *vlan; 798 struct ieee80211_chanctx_conf *conf; 799 800 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 801 return; 802 803 lockdep_assert_held(&local->mtx); 804 805 /* Check that conf exists, even when clearing this function 806 * must be called with the AP's channel context still there 807 * as it would otherwise cause VLANs to have an invalid 808 * channel context pointer for a while, possibly pointing 809 * to a channel context that has already been freed. 810 */ 811 conf = rcu_dereference_protected(sdata->vif.chanctx_conf, 812 lockdep_is_held(&local->chanctx_mtx)); 813 WARN_ON(!conf); 814 815 if (clear) 816 conf = NULL; 817 818 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 819 rcu_assign_pointer(vlan->vif.chanctx_conf, conf); 820 } 821 822 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 823 bool clear) 824 { 825 struct ieee80211_local *local = sdata->local; 826 827 mutex_lock(&local->chanctx_mtx); 828 829 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); 830 831 mutex_unlock(&local->chanctx_mtx); 832 } 833 834 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) 835 { 836 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; 837 838 lockdep_assert_held(&sdata->local->chanctx_mtx); 839 840 if (WARN_ON(!ctx)) 841 return -EINVAL; 842 843 list_del(&sdata->reserved_chanctx_list); 844 sdata->reserved_chanctx = NULL; 845 846 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 847 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 848 if (WARN_ON(!ctx->replace_ctx)) 849 return -EINVAL; 850 851 WARN_ON(ctx->replace_ctx->replace_state != 852 IEEE80211_CHANCTX_WILL_BE_REPLACED); 853 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 854 855 ctx->replace_ctx->replace_ctx = NULL; 856 ctx->replace_ctx->replace_state = 857 IEEE80211_CHANCTX_REPLACE_NONE; 858 859 list_del_rcu(&ctx->list); 860 kfree_rcu(ctx, rcu_head); 861 } else { 862 ieee80211_free_chanctx(sdata->local, ctx); 863 } 864 } 865 866 return 0; 867 } 868 869 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, 870 const struct cfg80211_chan_def *chandef, 871 enum ieee80211_chanctx_mode mode, 872 bool radar_required) 873 { 874 struct ieee80211_local *local = sdata->local; 875 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; 876 877 lockdep_assert_held(&local->chanctx_mtx); 878 879 curr_ctx = ieee80211_vif_get_chanctx(sdata); 880 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx) 881 return -ENOTSUPP; 882 883 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); 884 if (!new_ctx) { 885 if (ieee80211_can_create_new_chanctx(local)) { 886 new_ctx = ieee80211_new_chanctx(local, chandef, mode); 887 if (IS_ERR(new_ctx)) 888 return PTR_ERR(new_ctx); 889 } else { 890 if (!curr_ctx || 891 (curr_ctx->replace_state == 892 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 893 !list_empty(&curr_ctx->reserved_vifs)) { 894 /* 895 * Another vif already requested this context 896 * for a reservation. Find another one hoping 897 * all vifs assigned to it will also switch 898 * soon enough. 899 * 900 * TODO: This needs a little more work as some 901 * cases (more than 2 chanctx capable devices) 902 * may fail which could otherwise succeed 903 * provided some channel context juggling was 904 * performed. 905 * 906 * Consider ctx1..3, vif1..6, each ctx has 2 907 * vifs. vif1 and vif2 from ctx1 request new 908 * different chandefs starting 2 in-place 909 * reserations with ctx4 and ctx5 replacing 910 * ctx1 and ctx2 respectively. Next vif5 and 911 * vif6 from ctx3 reserve ctx4. If vif3 and 912 * vif4 remain on ctx2 as they are then this 913 * fails unless `replace_ctx` from ctx5 is 914 * replaced with ctx3. 915 */ 916 list_for_each_entry(ctx, &local->chanctx_list, 917 list) { 918 if (ctx->replace_state != 919 IEEE80211_CHANCTX_REPLACE_NONE) 920 continue; 921 922 if (!list_empty(&ctx->reserved_vifs)) 923 continue; 924 925 curr_ctx = ctx; 926 break; 927 } 928 } 929 930 /* 931 * If that's true then all available contexts already 932 * have reservations and cannot be used. 933 */ 934 if (!curr_ctx || 935 (curr_ctx->replace_state == 936 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 937 !list_empty(&curr_ctx->reserved_vifs)) 938 return -EBUSY; 939 940 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode); 941 if (!new_ctx) 942 return -ENOMEM; 943 944 new_ctx->replace_ctx = curr_ctx; 945 new_ctx->replace_state = 946 IEEE80211_CHANCTX_REPLACES_OTHER; 947 948 curr_ctx->replace_ctx = new_ctx; 949 curr_ctx->replace_state = 950 IEEE80211_CHANCTX_WILL_BE_REPLACED; 951 952 list_add_rcu(&new_ctx->list, &local->chanctx_list); 953 } 954 } 955 956 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); 957 sdata->reserved_chanctx = new_ctx; 958 sdata->reserved_chandef = *chandef; 959 sdata->reserved_radar_required = radar_required; 960 sdata->reserved_ready = false; 961 962 return 0; 963 } 964 965 static void 966 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 967 { 968 switch (sdata->vif.type) { 969 case NL80211_IFTYPE_ADHOC: 970 case NL80211_IFTYPE_AP: 971 case NL80211_IFTYPE_MESH_POINT: 972 case NL80211_IFTYPE_OCB: 973 ieee80211_queue_work(&sdata->local->hw, 974 &sdata->csa_finalize_work); 975 break; 976 case NL80211_IFTYPE_STATION: 977 ieee80211_queue_work(&sdata->local->hw, 978 &sdata->u.mgd.chswitch_work); 979 break; 980 case NL80211_IFTYPE_UNSPECIFIED: 981 case NL80211_IFTYPE_AP_VLAN: 982 case NL80211_IFTYPE_WDS: 983 case NL80211_IFTYPE_MONITOR: 984 case NL80211_IFTYPE_P2P_CLIENT: 985 case NL80211_IFTYPE_P2P_GO: 986 case NL80211_IFTYPE_P2P_DEVICE: 987 case NL80211_IFTYPE_NAN: 988 case NUM_NL80211_IFTYPES: 989 WARN_ON(1); 990 break; 991 } 992 } 993 994 static void 995 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata, 996 const struct cfg80211_chan_def *chandef) 997 { 998 struct ieee80211_sub_if_data *vlan; 999 1000 sdata->vif.bss_conf.chandef = *chandef; 1001 1002 if (sdata->vif.type != NL80211_IFTYPE_AP) 1003 return; 1004 1005 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) 1006 vlan->vif.bss_conf.chandef = *chandef; 1007 } 1008 1009 static int 1010 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata) 1011 { 1012 struct ieee80211_local *local = sdata->local; 1013 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1014 struct ieee80211_chanctx *old_ctx, *new_ctx; 1015 const struct cfg80211_chan_def *chandef; 1016 u32 changed = 0; 1017 int err; 1018 1019 lockdep_assert_held(&local->mtx); 1020 lockdep_assert_held(&local->chanctx_mtx); 1021 1022 new_ctx = sdata->reserved_chanctx; 1023 old_ctx = ieee80211_vif_get_chanctx(sdata); 1024 1025 if (WARN_ON(!sdata->reserved_ready)) 1026 return -EBUSY; 1027 1028 if (WARN_ON(!new_ctx)) 1029 return -EINVAL; 1030 1031 if (WARN_ON(!old_ctx)) 1032 return -EINVAL; 1033 1034 if (WARN_ON(new_ctx->replace_state == 1035 IEEE80211_CHANCTX_REPLACES_OTHER)) 1036 return -EINVAL; 1037 1038 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1039 &sdata->reserved_chandef); 1040 if (WARN_ON(!chandef)) 1041 return -EINVAL; 1042 1043 ieee80211_change_chanctx(local, new_ctx, chandef); 1044 1045 vif_chsw[0].vif = &sdata->vif; 1046 vif_chsw[0].old_ctx = &old_ctx->conf; 1047 vif_chsw[0].new_ctx = &new_ctx->conf; 1048 1049 list_del(&sdata->reserved_chanctx_list); 1050 sdata->reserved_chanctx = NULL; 1051 1052 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1053 CHANCTX_SWMODE_REASSIGN_VIF); 1054 if (err) { 1055 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1056 ieee80211_free_chanctx(local, new_ctx); 1057 1058 goto out; 1059 } 1060 1061 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs); 1062 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf); 1063 1064 if (sdata->vif.type == NL80211_IFTYPE_AP) 1065 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); 1066 1067 ieee80211_check_fast_xmit_iface(sdata); 1068 1069 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1070 ieee80211_free_chanctx(local, old_ctx); 1071 1072 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) 1073 changed = BSS_CHANGED_BANDWIDTH; 1074 1075 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef); 1076 1077 ieee80211_recalc_smps_chanctx(local, new_ctx); 1078 ieee80211_recalc_radar_chanctx(local, new_ctx); 1079 ieee80211_recalc_chanctx_min_def(local, new_ctx); 1080 1081 if (changed) 1082 ieee80211_bss_info_change_notify(sdata, changed); 1083 1084 out: 1085 ieee80211_vif_chanctx_reservation_complete(sdata); 1086 return err; 1087 } 1088 1089 static int 1090 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata) 1091 { 1092 struct ieee80211_local *local = sdata->local; 1093 struct ieee80211_chanctx *old_ctx, *new_ctx; 1094 const struct cfg80211_chan_def *chandef; 1095 int err; 1096 1097 old_ctx = ieee80211_vif_get_chanctx(sdata); 1098 new_ctx = sdata->reserved_chanctx; 1099 1100 if (WARN_ON(!sdata->reserved_ready)) 1101 return -EINVAL; 1102 1103 if (WARN_ON(old_ctx)) 1104 return -EINVAL; 1105 1106 if (WARN_ON(!new_ctx)) 1107 return -EINVAL; 1108 1109 if (WARN_ON(new_ctx->replace_state == 1110 IEEE80211_CHANCTX_REPLACES_OTHER)) 1111 return -EINVAL; 1112 1113 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1114 &sdata->reserved_chandef); 1115 if (WARN_ON(!chandef)) 1116 return -EINVAL; 1117 1118 ieee80211_change_chanctx(local, new_ctx, chandef); 1119 1120 list_del(&sdata->reserved_chanctx_list); 1121 sdata->reserved_chanctx = NULL; 1122 1123 err = ieee80211_assign_vif_chanctx(sdata, new_ctx); 1124 if (err) { 1125 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1126 ieee80211_free_chanctx(local, new_ctx); 1127 1128 goto out; 1129 } 1130 1131 out: 1132 ieee80211_vif_chanctx_reservation_complete(sdata); 1133 return err; 1134 } 1135 1136 static bool 1137 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata) 1138 { 1139 struct ieee80211_chanctx *old_ctx, *new_ctx; 1140 1141 lockdep_assert_held(&sdata->local->chanctx_mtx); 1142 1143 new_ctx = sdata->reserved_chanctx; 1144 old_ctx = ieee80211_vif_get_chanctx(sdata); 1145 1146 if (!old_ctx) 1147 return false; 1148 1149 if (WARN_ON(!new_ctx)) 1150 return false; 1151 1152 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1153 return false; 1154 1155 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1156 return false; 1157 1158 return true; 1159 } 1160 1161 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local, 1162 struct ieee80211_chanctx *new_ctx) 1163 { 1164 const struct cfg80211_chan_def *chandef; 1165 1166 lockdep_assert_held(&local->mtx); 1167 lockdep_assert_held(&local->chanctx_mtx); 1168 1169 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL); 1170 if (WARN_ON(!chandef)) 1171 return -EINVAL; 1172 1173 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled; 1174 local->_oper_chandef = *chandef; 1175 ieee80211_hw_config(local, 0); 1176 1177 return 0; 1178 } 1179 1180 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1181 int n_vifs) 1182 { 1183 struct ieee80211_vif_chanctx_switch *vif_chsw; 1184 struct ieee80211_sub_if_data *sdata; 1185 struct ieee80211_chanctx *ctx, *old_ctx; 1186 int i, err; 1187 1188 lockdep_assert_held(&local->mtx); 1189 lockdep_assert_held(&local->chanctx_mtx); 1190 1191 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1192 if (!vif_chsw) 1193 return -ENOMEM; 1194 1195 i = 0; 1196 list_for_each_entry(ctx, &local->chanctx_list, list) { 1197 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1198 continue; 1199 1200 if (WARN_ON(!ctx->replace_ctx)) { 1201 err = -EINVAL; 1202 goto out; 1203 } 1204 1205 list_for_each_entry(sdata, &ctx->reserved_vifs, 1206 reserved_chanctx_list) { 1207 if (!ieee80211_vif_has_in_place_reservation( 1208 sdata)) 1209 continue; 1210 1211 old_ctx = ieee80211_vif_get_chanctx(sdata); 1212 vif_chsw[i].vif = &sdata->vif; 1213 vif_chsw[i].old_ctx = &old_ctx->conf; 1214 vif_chsw[i].new_ctx = &ctx->conf; 1215 1216 i++; 1217 } 1218 } 1219 1220 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1221 CHANCTX_SWMODE_SWAP_CONTEXTS); 1222 1223 out: 1224 kfree(vif_chsw); 1225 return err; 1226 } 1227 1228 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1229 { 1230 struct ieee80211_chanctx *ctx; 1231 int err; 1232 1233 lockdep_assert_held(&local->mtx); 1234 lockdep_assert_held(&local->chanctx_mtx); 1235 1236 list_for_each_entry(ctx, &local->chanctx_list, list) { 1237 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1238 continue; 1239 1240 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1241 continue; 1242 1243 ieee80211_del_chanctx(local, ctx->replace_ctx); 1244 err = ieee80211_add_chanctx(local, ctx); 1245 if (err) 1246 goto err; 1247 } 1248 1249 return 0; 1250 1251 err: 1252 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1253 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1254 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1255 continue; 1256 1257 if (!list_empty(&ctx->replace_ctx->assigned_vifs)) 1258 continue; 1259 1260 ieee80211_del_chanctx(local, ctx); 1261 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1262 } 1263 1264 return err; 1265 } 1266 1267 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1268 { 1269 struct ieee80211_sub_if_data *sdata, *sdata_tmp; 1270 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1271 struct ieee80211_chanctx *new_ctx = NULL; 1272 int err, n_assigned, n_reserved, n_ready; 1273 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1274 1275 lockdep_assert_held(&local->mtx); 1276 lockdep_assert_held(&local->chanctx_mtx); 1277 1278 /* 1279 * If there are 2 independent pairs of channel contexts performing 1280 * cross-switch of their vifs this code will still wait until both are 1281 * ready even though it could be possible to switch one before the 1282 * other is ready. 1283 * 1284 * For practical reasons and code simplicity just do a single huge 1285 * switch. 1286 */ 1287 1288 /* 1289 * Verify if the reservation is still feasible. 1290 * - if it's not then disconnect 1291 * - if it is but not all vifs necessary are ready then defer 1292 */ 1293 1294 list_for_each_entry(ctx, &local->chanctx_list, list) { 1295 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1296 continue; 1297 1298 if (WARN_ON(!ctx->replace_ctx)) { 1299 err = -EINVAL; 1300 goto err; 1301 } 1302 1303 if (!local->use_chanctx) 1304 new_ctx = ctx; 1305 1306 n_ctx++; 1307 1308 n_assigned = 0; 1309 n_reserved = 0; 1310 n_ready = 0; 1311 1312 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs, 1313 assigned_chanctx_list) { 1314 n_assigned++; 1315 if (sdata->reserved_chanctx) { 1316 n_reserved++; 1317 if (sdata->reserved_ready) 1318 n_ready++; 1319 } 1320 } 1321 1322 if (n_assigned != n_reserved) { 1323 if (n_ready == n_reserved) { 1324 wiphy_info(local->hw.wiphy, 1325 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1326 err = -EBUSY; 1327 goto err; 1328 } 1329 1330 return -EAGAIN; 1331 } 1332 1333 ctx->conf.radar_enabled = false; 1334 list_for_each_entry(sdata, &ctx->reserved_vifs, 1335 reserved_chanctx_list) { 1336 if (ieee80211_vif_has_in_place_reservation(sdata) && 1337 !sdata->reserved_ready) 1338 return -EAGAIN; 1339 1340 old_ctx = ieee80211_vif_get_chanctx(sdata); 1341 if (old_ctx) { 1342 if (old_ctx->replace_state == 1343 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1344 n_vifs_switch++; 1345 else 1346 n_vifs_assign++; 1347 } else { 1348 n_vifs_ctxless++; 1349 } 1350 1351 if (sdata->reserved_radar_required) 1352 ctx->conf.radar_enabled = true; 1353 } 1354 } 1355 1356 if (WARN_ON(n_ctx == 0) || 1357 WARN_ON(n_vifs_switch == 0 && 1358 n_vifs_assign == 0 && 1359 n_vifs_ctxless == 0) || 1360 WARN_ON(n_ctx > 1 && !local->use_chanctx) || 1361 WARN_ON(!new_ctx && !local->use_chanctx)) { 1362 err = -EINVAL; 1363 goto err; 1364 } 1365 1366 /* 1367 * All necessary vifs are ready. Perform the switch now depending on 1368 * reservations and driver capabilities. 1369 */ 1370 1371 if (local->use_chanctx) { 1372 if (n_vifs_switch > 0) { 1373 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1374 if (err) 1375 goto err; 1376 } 1377 1378 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1379 err = ieee80211_chsw_switch_ctxs(local); 1380 if (err) 1381 goto err; 1382 } 1383 } else { 1384 err = ieee80211_chsw_switch_hwconf(local, new_ctx); 1385 if (err) 1386 goto err; 1387 } 1388 1389 /* 1390 * Update all structures, values and pointers to point to new channel 1391 * context(s). 1392 */ 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