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