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