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