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