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