1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * mac80211 - channel management 4 * Copyright 2020 - 2024 Intel Corporation 5 */ 6 7 #include <linux/nl80211.h> 8 #include <linux/export.h> 9 #include <linux/rtnetlink.h> 10 #include <net/cfg80211.h> 11 #include "ieee80211_i.h" 12 #include "driver-ops.h" 13 #include "rate.h" 14 15 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local, 16 struct ieee80211_chanctx *ctx) 17 { 18 struct ieee80211_link_data *link; 19 int num = 0; 20 21 lockdep_assert_wiphy(local->hw.wiphy); 22 23 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) 24 num++; 25 26 return num; 27 } 28 29 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local, 30 struct ieee80211_chanctx *ctx) 31 { 32 struct ieee80211_link_data *link; 33 int num = 0; 34 35 lockdep_assert_wiphy(local->hw.wiphy); 36 37 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) 38 num++; 39 40 return num; 41 } 42 43 int ieee80211_chanctx_refcount(struct ieee80211_local *local, 44 struct ieee80211_chanctx *ctx) 45 { 46 return ieee80211_chanctx_num_assigned(local, ctx) + 47 ieee80211_chanctx_num_reserved(local, ctx); 48 } 49 50 static int ieee80211_num_chanctx(struct ieee80211_local *local, int radio_idx) 51 { 52 struct ieee80211_chanctx *ctx; 53 int num = 0; 54 55 lockdep_assert_wiphy(local->hw.wiphy); 56 57 list_for_each_entry(ctx, &local->chanctx_list, list) { 58 if (radio_idx >= 0 && ctx->conf.radio_idx != radio_idx) 59 continue; 60 num++; 61 } 62 63 return num; 64 } 65 66 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local, 67 int radio_idx) 68 { 69 lockdep_assert_wiphy(local->hw.wiphy); 70 71 return ieee80211_num_chanctx(local, radio_idx) < 72 ieee80211_max_num_channels(local, radio_idx); 73 } 74 75 static struct ieee80211_chanctx * 76 ieee80211_link_get_chanctx(struct ieee80211_link_data *link) 77 { 78 struct ieee80211_local *local __maybe_unused = link->sdata->local; 79 struct ieee80211_chanctx_conf *conf; 80 81 conf = rcu_dereference_protected(link->conf->chanctx_conf, 82 lockdep_is_held(&local->hw.wiphy->mtx)); 83 if (!conf) 84 return NULL; 85 86 return container_of(conf, struct ieee80211_chanctx, conf); 87 } 88 89 bool ieee80211_chanreq_identical(const struct ieee80211_chan_req *a, 90 const struct ieee80211_chan_req *b) 91 { 92 if (!cfg80211_chandef_identical(&a->oper, &b->oper)) 93 return false; 94 if (!a->ap.chan && !b->ap.chan) 95 return true; 96 return cfg80211_chandef_identical(&a->ap, &b->ap); 97 } 98 99 static const struct ieee80211_chan_req * 100 ieee80211_chanreq_compatible(const struct ieee80211_chan_req *a, 101 const struct ieee80211_chan_req *b, 102 struct ieee80211_chan_req *tmp) 103 { 104 const struct cfg80211_chan_def *compat; 105 106 if (a->ap.chan && b->ap.chan && 107 !cfg80211_chandef_identical(&a->ap, &b->ap)) 108 return NULL; 109 110 compat = cfg80211_chandef_compatible(&a->oper, &b->oper); 111 if (!compat) 112 return NULL; 113 114 /* Note: later code assumes this always fills & returns tmp if compat */ 115 tmp->oper = *compat; 116 tmp->ap = a->ap.chan ? a->ap : b->ap; 117 return tmp; 118 } 119 120 static const struct ieee80211_chan_req * 121 ieee80211_chanctx_compatible(struct ieee80211_chanctx *ctx, 122 const struct ieee80211_chan_req *req, 123 struct ieee80211_chan_req *tmp) 124 { 125 const struct ieee80211_chan_req *ret; 126 struct ieee80211_chan_req tmp2; 127 128 *tmp = (struct ieee80211_chan_req){ 129 .oper = ctx->conf.def, 130 .ap = ctx->conf.ap, 131 }; 132 133 ret = ieee80211_chanreq_compatible(tmp, req, &tmp2); 134 if (!ret) 135 return NULL; 136 *tmp = *ret; 137 return tmp; 138 } 139 140 static const struct ieee80211_chan_req * 141 ieee80211_chanctx_reserved_chanreq(struct ieee80211_local *local, 142 struct ieee80211_chanctx *ctx, 143 const struct ieee80211_chan_req *req, 144 struct ieee80211_chan_req *tmp) 145 { 146 struct ieee80211_link_data *link; 147 148 lockdep_assert_wiphy(local->hw.wiphy); 149 150 if (WARN_ON(!req)) 151 return NULL; 152 153 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) { 154 req = ieee80211_chanreq_compatible(&link->reserved, req, tmp); 155 if (!req) 156 break; 157 } 158 159 return req; 160 } 161 162 static const struct ieee80211_chan_req * 163 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local, 164 struct ieee80211_chanctx *ctx, 165 const struct ieee80211_chan_req *compat, 166 struct ieee80211_chan_req *tmp) 167 { 168 struct ieee80211_link_data *link; 169 const struct ieee80211_chan_req *comp_def = compat; 170 171 lockdep_assert_wiphy(local->hw.wiphy); 172 173 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) { 174 struct ieee80211_bss_conf *link_conf = link->conf; 175 176 if (link->reserved_chanctx) 177 continue; 178 179 comp_def = ieee80211_chanreq_compatible(&link_conf->chanreq, 180 comp_def, tmp); 181 if (!comp_def) 182 break; 183 } 184 185 return comp_def; 186 } 187 188 static bool 189 ieee80211_chanctx_can_reserve(struct ieee80211_local *local, 190 struct ieee80211_chanctx *ctx, 191 const struct ieee80211_chan_req *req) 192 { 193 struct ieee80211_chan_req tmp; 194 195 lockdep_assert_wiphy(local->hw.wiphy); 196 197 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp)) 198 return false; 199 200 if (!ieee80211_chanctx_non_reserved_chandef(local, ctx, req, &tmp)) 201 return false; 202 203 if (!list_empty(&ctx->reserved_links) && 204 ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp)) 205 return true; 206 207 return false; 208 } 209 210 static struct ieee80211_chanctx * 211 ieee80211_find_reservation_chanctx(struct ieee80211_local *local, 212 const struct ieee80211_chan_req *chanreq, 213 enum ieee80211_chanctx_mode mode) 214 { 215 struct ieee80211_chanctx *ctx; 216 217 lockdep_assert_wiphy(local->hw.wiphy); 218 219 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 220 return NULL; 221 222 list_for_each_entry(ctx, &local->chanctx_list, list) { 223 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) 224 continue; 225 226 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 227 continue; 228 229 if (!ieee80211_chanctx_can_reserve(local, ctx, chanreq)) 230 continue; 231 232 return ctx; 233 } 234 235 return NULL; 236 } 237 238 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta, 239 unsigned int link_id) 240 { 241 enum ieee80211_sta_rx_bandwidth width; 242 struct link_sta_info *link_sta; 243 244 link_sta = wiphy_dereference(sta->local->hw.wiphy, sta->link[link_id]); 245 246 /* no effect if this STA has no presence on this link */ 247 if (!link_sta) 248 return NL80211_CHAN_WIDTH_20_NOHT; 249 250 width = ieee80211_sta_cap_rx_bw(link_sta); 251 252 switch (width) { 253 case IEEE80211_STA_RX_BW_20: 254 if (link_sta->pub->ht_cap.ht_supported) 255 return NL80211_CHAN_WIDTH_20; 256 else 257 return NL80211_CHAN_WIDTH_20_NOHT; 258 case IEEE80211_STA_RX_BW_40: 259 return NL80211_CHAN_WIDTH_40; 260 case IEEE80211_STA_RX_BW_80: 261 return NL80211_CHAN_WIDTH_80; 262 case IEEE80211_STA_RX_BW_160: 263 /* 264 * This applied for both 160 and 80+80. since we use 265 * the returned value to consider degradation of 266 * ctx->conf.min_def, we have to make sure to take 267 * the bigger one (NL80211_CHAN_WIDTH_160). 268 * Otherwise we might try degrading even when not 269 * needed, as the max required sta_bw returned (80+80) 270 * might be smaller than the configured bw (160). 271 */ 272 return NL80211_CHAN_WIDTH_160; 273 case IEEE80211_STA_RX_BW_320: 274 return NL80211_CHAN_WIDTH_320; 275 default: 276 WARN_ON(1); 277 return NL80211_CHAN_WIDTH_20; 278 } 279 } 280 281 static enum nl80211_chan_width 282 ieee80211_get_max_required_bw(struct ieee80211_link_data *link) 283 { 284 struct ieee80211_sub_if_data *sdata = link->sdata; 285 unsigned int link_id = link->link_id; 286 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 287 struct sta_info *sta; 288 289 lockdep_assert_wiphy(sdata->local->hw.wiphy); 290 291 list_for_each_entry(sta, &sdata->local->sta_list, list) { 292 if (sdata != sta->sdata && 293 !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) 294 continue; 295 296 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id)); 297 } 298 299 return max_bw; 300 } 301 302 static enum nl80211_chan_width 303 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, 304 struct ieee80211_chanctx *ctx, 305 struct ieee80211_link_data *rsvd_for, 306 bool check_reserved) 307 { 308 struct ieee80211_sub_if_data *sdata; 309 struct ieee80211_link_data *link; 310 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; 311 312 if (WARN_ON(check_reserved && rsvd_for)) 313 return ctx->conf.def.width; 314 315 for_each_sdata_link(local, link) { 316 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; 317 318 if (check_reserved) { 319 if (link->reserved_chanctx != ctx) 320 continue; 321 } else if (link != rsvd_for && 322 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf) 323 continue; 324 325 switch (link->sdata->vif.type) { 326 case NL80211_IFTYPE_AP: 327 case NL80211_IFTYPE_AP_VLAN: 328 width = ieee80211_get_max_required_bw(link); 329 break; 330 case NL80211_IFTYPE_STATION: 331 /* 332 * The ap's sta->bandwidth is not set yet at this 333 * point, so take the width from the chandef, but 334 * account also for TDLS peers 335 */ 336 width = max(link->conf->chanreq.oper.width, 337 ieee80211_get_max_required_bw(link)); 338 break; 339 case NL80211_IFTYPE_P2P_DEVICE: 340 case NL80211_IFTYPE_NAN: 341 continue; 342 case NL80211_IFTYPE_ADHOC: 343 case NL80211_IFTYPE_MESH_POINT: 344 case NL80211_IFTYPE_OCB: 345 width = link->conf->chanreq.oper.width; 346 break; 347 case NL80211_IFTYPE_WDS: 348 case NL80211_IFTYPE_UNSPECIFIED: 349 case NUM_NL80211_IFTYPES: 350 case NL80211_IFTYPE_MONITOR: 351 case NL80211_IFTYPE_P2P_CLIENT: 352 case NL80211_IFTYPE_P2P_GO: 353 WARN_ON_ONCE(1); 354 } 355 356 max_bw = max(max_bw, width); 357 } 358 359 /* use the configured bandwidth in case of monitor interface */ 360 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata); 361 if (sdata && 362 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf) 363 max_bw = max(max_bw, ctx->conf.def.width); 364 365 return max_bw; 366 } 367 368 /* 369 * recalc the min required chan width of the channel context, which is 370 * the max of min required widths of all the interfaces bound to this 371 * channel context. 372 */ 373 static u32 374 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 375 struct ieee80211_chanctx *ctx, 376 struct ieee80211_link_data *rsvd_for, 377 bool check_reserved) 378 { 379 enum nl80211_chan_width max_bw; 380 struct cfg80211_chan_def min_def; 381 382 lockdep_assert_wiphy(local->hw.wiphy); 383 384 /* don't optimize non-20MHz based and radar_enabled confs */ 385 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || 386 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || 387 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 || 388 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 || 389 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 || 390 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 || 391 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 || 392 ctx->conf.radar_enabled) { 393 ctx->conf.min_def = ctx->conf.def; 394 return 0; 395 } 396 397 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for, 398 check_reserved); 399 400 /* downgrade chandef up to max_bw */ 401 min_def = ctx->conf.def; 402 while (min_def.width > max_bw) 403 ieee80211_chandef_downgrade(&min_def, NULL); 404 405 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) 406 return 0; 407 408 ctx->conf.min_def = min_def; 409 if (!ctx->driver_present) 410 return 0; 411 412 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH; 413 } 414 415 static void ieee80211_chan_bw_change(struct ieee80211_local *local, 416 struct ieee80211_chanctx *ctx, 417 bool reserved, bool narrowed) 418 { 419 struct sta_info *sta; 420 struct ieee80211_supported_band *sband = 421 local->hw.wiphy->bands[ctx->conf.def.chan->band]; 422 423 rcu_read_lock(); 424 list_for_each_entry_rcu(sta, &local->sta_list, 425 list) { 426 struct ieee80211_sub_if_data *sdata = sta->sdata; 427 enum ieee80211_sta_rx_bandwidth new_sta_bw; 428 unsigned int link_id; 429 430 if (!ieee80211_sdata_running(sta->sdata)) 431 continue; 432 433 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) { 434 struct ieee80211_link_data *link = 435 rcu_dereference(sdata->link[link_id]); 436 struct ieee80211_bss_conf *link_conf; 437 struct cfg80211_chan_def *new_chandef; 438 struct link_sta_info *link_sta; 439 440 if (!link) 441 continue; 442 443 link_conf = link->conf; 444 445 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf) 446 continue; 447 448 link_sta = rcu_dereference(sta->link[link_id]); 449 if (!link_sta) 450 continue; 451 452 if (reserved) 453 new_chandef = &link->reserved.oper; 454 else 455 new_chandef = &link_conf->chanreq.oper; 456 457 new_sta_bw = _ieee80211_sta_cur_vht_bw(link_sta, 458 new_chandef); 459 460 /* nothing change */ 461 if (new_sta_bw == link_sta->pub->bandwidth) 462 continue; 463 464 /* vif changed to narrow BW and narrow BW for station wasn't 465 * requested or vise versa */ 466 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed) 467 continue; 468 469 link_sta->pub->bandwidth = new_sta_bw; 470 rate_control_rate_update(local, sband, sta, link_id, 471 IEEE80211_RC_BW_CHANGED); 472 } 473 } 474 rcu_read_unlock(); 475 } 476 477 /* 478 * recalc the min required chan width of the channel context, which is 479 * the max of min required widths of all the interfaces bound to this 480 * channel context. 481 */ 482 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, 483 struct ieee80211_chanctx *ctx, 484 struct ieee80211_link_data *rsvd_for, 485 bool check_reserved) 486 { 487 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, 488 check_reserved); 489 490 if (!changed) 491 return; 492 493 /* check is BW narrowed */ 494 ieee80211_chan_bw_change(local, ctx, false, true); 495 496 drv_change_chanctx(local, ctx, changed); 497 498 /* check is BW wider */ 499 ieee80211_chan_bw_change(local, ctx, false, false); 500 } 501 502 static void _ieee80211_change_chanctx(struct ieee80211_local *local, 503 struct ieee80211_chanctx *ctx, 504 struct ieee80211_chanctx *old_ctx, 505 const struct ieee80211_chan_req *chanreq, 506 struct ieee80211_link_data *rsvd_for) 507 { 508 const struct cfg80211_chan_def *chandef = &chanreq->oper; 509 struct ieee80211_chan_req ctx_req = { 510 .oper = ctx->conf.def, 511 .ap = ctx->conf.ap, 512 }; 513 u32 changed = 0; 514 515 /* expected to handle only 20/40/80/160/320 channel widths */ 516 switch (chandef->width) { 517 case NL80211_CHAN_WIDTH_20_NOHT: 518 case NL80211_CHAN_WIDTH_20: 519 case NL80211_CHAN_WIDTH_40: 520 case NL80211_CHAN_WIDTH_80: 521 case NL80211_CHAN_WIDTH_80P80: 522 case NL80211_CHAN_WIDTH_160: 523 case NL80211_CHAN_WIDTH_320: 524 break; 525 default: 526 WARN_ON(1); 527 } 528 529 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def 530 * due to maybe not returning from it, e.g in case new context was added 531 * first time with all parameters up to date. 532 */ 533 ieee80211_chan_bw_change(local, old_ctx, false, true); 534 535 if (ieee80211_chanreq_identical(&ctx_req, chanreq)) { 536 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false); 537 return; 538 } 539 540 WARN_ON(ieee80211_chanctx_refcount(local, ctx) > 1 && 541 !cfg80211_chandef_compatible(&ctx->conf.def, &chanreq->oper)); 542 543 ieee80211_remove_wbrf(local, &ctx->conf.def); 544 545 if (!cfg80211_chandef_identical(&ctx->conf.def, &chanreq->oper)) { 546 if (ctx->conf.def.width != chanreq->oper.width) 547 changed |= IEEE80211_CHANCTX_CHANGE_WIDTH; 548 if (ctx->conf.def.punctured != chanreq->oper.punctured) 549 changed |= IEEE80211_CHANCTX_CHANGE_PUNCTURING; 550 } 551 if (!cfg80211_chandef_identical(&ctx->conf.ap, &chanreq->ap)) 552 changed |= IEEE80211_CHANCTX_CHANGE_AP; 553 ctx->conf.def = *chandef; 554 ctx->conf.ap = chanreq->ap; 555 556 /* check if min chanctx also changed */ 557 changed |= _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false); 558 559 ieee80211_add_wbrf(local, &ctx->conf.def); 560 561 drv_change_chanctx(local, ctx, changed); 562 563 /* check if BW is wider */ 564 ieee80211_chan_bw_change(local, old_ctx, false, false); 565 } 566 567 static void ieee80211_change_chanctx(struct ieee80211_local *local, 568 struct ieee80211_chanctx *ctx, 569 struct ieee80211_chanctx *old_ctx, 570 const struct ieee80211_chan_req *chanreq) 571 { 572 _ieee80211_change_chanctx(local, ctx, old_ctx, chanreq, NULL); 573 } 574 575 /* Note: if successful, the returned chanctx is reserved for the link */ 576 static struct ieee80211_chanctx * 577 ieee80211_find_chanctx(struct ieee80211_local *local, 578 struct ieee80211_link_data *link, 579 const struct ieee80211_chan_req *chanreq, 580 enum ieee80211_chanctx_mode mode) 581 { 582 struct ieee80211_chan_req tmp; 583 struct ieee80211_chanctx *ctx; 584 585 lockdep_assert_wiphy(local->hw.wiphy); 586 587 if (mode == IEEE80211_CHANCTX_EXCLUSIVE) 588 return NULL; 589 590 if (WARN_ON(link->reserved_chanctx)) 591 return NULL; 592 593 list_for_each_entry(ctx, &local->chanctx_list, list) { 594 const struct ieee80211_chan_req *compat; 595 596 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE) 597 continue; 598 599 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) 600 continue; 601 602 compat = ieee80211_chanctx_compatible(ctx, chanreq, &tmp); 603 if (!compat) 604 continue; 605 606 compat = ieee80211_chanctx_reserved_chanreq(local, ctx, 607 compat, &tmp); 608 if (!compat) 609 continue; 610 611 /* 612 * Reserve the chanctx temporarily, as the driver might change 613 * active links during callbacks we make into it below and/or 614 * later during assignment, which could (otherwise) cause the 615 * context to actually be removed. 616 */ 617 link->reserved_chanctx = ctx; 618 list_add(&link->reserved_chanctx_list, 619 &ctx->reserved_links); 620 621 ieee80211_change_chanctx(local, ctx, ctx, compat); 622 623 return ctx; 624 } 625 626 return NULL; 627 } 628 629 bool ieee80211_is_radar_required(struct ieee80211_local *local) 630 { 631 struct ieee80211_link_data *link; 632 633 lockdep_assert_wiphy(local->hw.wiphy); 634 635 for_each_sdata_link(local, link) { 636 if (link->radar_required) 637 return true; 638 } 639 640 return false; 641 } 642 643 static bool 644 ieee80211_chanctx_radar_required(struct ieee80211_local *local, 645 struct ieee80211_chanctx *ctx) 646 { 647 struct ieee80211_chanctx_conf *conf = &ctx->conf; 648 struct ieee80211_link_data *link; 649 650 lockdep_assert_wiphy(local->hw.wiphy); 651 652 for_each_sdata_link(local, link) { 653 if (rcu_access_pointer(link->conf->chanctx_conf) != conf) 654 continue; 655 if (!link->radar_required) 656 continue; 657 return true; 658 } 659 660 return false; 661 } 662 663 static struct ieee80211_chanctx * 664 ieee80211_alloc_chanctx(struct ieee80211_local *local, 665 const struct ieee80211_chan_req *chanreq, 666 enum ieee80211_chanctx_mode mode, 667 int radio_idx) 668 { 669 struct ieee80211_chanctx *ctx; 670 671 lockdep_assert_wiphy(local->hw.wiphy); 672 673 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); 674 if (!ctx) 675 return NULL; 676 677 INIT_LIST_HEAD(&ctx->assigned_links); 678 INIT_LIST_HEAD(&ctx->reserved_links); 679 ctx->conf.def = chanreq->oper; 680 ctx->conf.ap = chanreq->ap; 681 ctx->conf.rx_chains_static = 1; 682 ctx->conf.rx_chains_dynamic = 1; 683 ctx->mode = mode; 684 ctx->conf.radar_enabled = false; 685 ctx->conf.radio_idx = radio_idx; 686 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false); 687 688 return ctx; 689 } 690 691 static int ieee80211_add_chanctx(struct ieee80211_local *local, 692 struct ieee80211_chanctx *ctx) 693 { 694 u32 changed; 695 int err; 696 697 lockdep_assert_wiphy(local->hw.wiphy); 698 699 ieee80211_add_wbrf(local, &ctx->conf.def); 700 701 /* turn idle off *before* setting channel -- some drivers need that */ 702 changed = ieee80211_idle_off(local); 703 if (changed) 704 ieee80211_hw_config(local, changed); 705 706 err = drv_add_chanctx(local, ctx); 707 if (err) { 708 ieee80211_recalc_idle(local); 709 return err; 710 } 711 712 return 0; 713 } 714 715 static struct ieee80211_chanctx * 716 ieee80211_new_chanctx(struct ieee80211_local *local, 717 const struct ieee80211_chan_req *chanreq, 718 enum ieee80211_chanctx_mode mode, 719 bool assign_on_failure, 720 int radio_idx) 721 { 722 struct ieee80211_chanctx *ctx; 723 int err; 724 725 lockdep_assert_wiphy(local->hw.wiphy); 726 727 ctx = ieee80211_alloc_chanctx(local, chanreq, mode, radio_idx); 728 if (!ctx) 729 return ERR_PTR(-ENOMEM); 730 731 err = ieee80211_add_chanctx(local, ctx); 732 if (!assign_on_failure && err) { 733 kfree(ctx); 734 return ERR_PTR(err); 735 } 736 /* We ignored a driver error, see _ieee80211_set_active_links */ 737 WARN_ON_ONCE(err && !local->in_reconfig); 738 739 list_add_rcu(&ctx->list, &local->chanctx_list); 740 return ctx; 741 } 742 743 static void ieee80211_del_chanctx(struct ieee80211_local *local, 744 struct ieee80211_chanctx *ctx, 745 bool skip_idle_recalc) 746 { 747 lockdep_assert_wiphy(local->hw.wiphy); 748 749 drv_remove_chanctx(local, ctx); 750 751 if (!skip_idle_recalc) 752 ieee80211_recalc_idle(local); 753 754 ieee80211_remove_wbrf(local, &ctx->conf.def); 755 } 756 757 static void ieee80211_free_chanctx(struct ieee80211_local *local, 758 struct ieee80211_chanctx *ctx, 759 bool skip_idle_recalc) 760 { 761 lockdep_assert_wiphy(local->hw.wiphy); 762 763 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); 764 765 list_del_rcu(&ctx->list); 766 ieee80211_del_chanctx(local, ctx, skip_idle_recalc); 767 kfree_rcu(ctx, rcu_head); 768 } 769 770 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, 771 struct ieee80211_chanctx *ctx) 772 { 773 struct ieee80211_chanctx_conf *conf = &ctx->conf; 774 const struct ieee80211_chan_req *compat = NULL; 775 struct ieee80211_link_data *link; 776 struct ieee80211_chan_req tmp; 777 struct sta_info *sta; 778 779 lockdep_assert_wiphy(local->hw.wiphy); 780 781 for_each_sdata_link(local, link) { 782 struct ieee80211_bss_conf *link_conf; 783 784 if (link->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 785 continue; 786 787 link_conf = link->conf; 788 789 if (rcu_access_pointer(link_conf->chanctx_conf) != conf) 790 continue; 791 792 if (!compat) 793 compat = &link_conf->chanreq; 794 795 compat = ieee80211_chanreq_compatible(&link_conf->chanreq, 796 compat, &tmp); 797 if (WARN_ON_ONCE(!compat)) 798 return; 799 } 800 801 if (WARN_ON_ONCE(!compat)) 802 return; 803 804 /* TDLS peers can sometimes affect the chandef width */ 805 list_for_each_entry(sta, &local->sta_list, list) { 806 struct ieee80211_sub_if_data *sdata = sta->sdata; 807 struct ieee80211_chan_req tdls_chanreq = {}; 808 int tdls_link_id; 809 810 if (!sta->uploaded || 811 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) || 812 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 813 !sta->tdls_chandef.chan) 814 continue; 815 816 tdls_link_id = ieee80211_tdls_sta_link_id(sta); 817 link = sdata_dereference(sdata->link[tdls_link_id], sdata); 818 if (!link) 819 continue; 820 821 if (rcu_access_pointer(link->conf->chanctx_conf) != conf) 822 continue; 823 824 tdls_chanreq.oper = sta->tdls_chandef; 825 826 /* note this always fills and returns &tmp if compat */ 827 compat = ieee80211_chanreq_compatible(&tdls_chanreq, 828 compat, &tmp); 829 if (WARN_ON_ONCE(!compat)) 830 return; 831 } 832 833 ieee80211_change_chanctx(local, ctx, ctx, compat); 834 } 835 836 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, 837 struct ieee80211_chanctx *chanctx) 838 { 839 bool radar_enabled; 840 841 lockdep_assert_wiphy(local->hw.wiphy); 842 843 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx); 844 845 if (radar_enabled == chanctx->conf.radar_enabled) 846 return; 847 848 chanctx->conf.radar_enabled = radar_enabled; 849 850 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); 851 } 852 853 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link, 854 struct ieee80211_chanctx *new_ctx, 855 bool assign_on_failure) 856 { 857 struct ieee80211_sub_if_data *sdata = link->sdata; 858 struct ieee80211_local *local = sdata->local; 859 struct ieee80211_chanctx_conf *conf; 860 struct ieee80211_chanctx *curr_ctx = NULL; 861 bool new_idle; 862 int ret; 863 864 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN)) 865 return -EOPNOTSUPP; 866 867 conf = rcu_dereference_protected(link->conf->chanctx_conf, 868 lockdep_is_held(&local->hw.wiphy->mtx)); 869 870 if (conf) { 871 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); 872 873 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx); 874 conf = NULL; 875 list_del(&link->assigned_chanctx_list); 876 } 877 878 if (new_ctx) { 879 /* recalc considering the link we'll use it for now */ 880 ieee80211_recalc_chanctx_min_def(local, new_ctx, link, false); 881 882 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx); 883 if (assign_on_failure || !ret) { 884 /* Need to continue, see _ieee80211_set_active_links */ 885 WARN_ON_ONCE(ret && !local->in_reconfig); 886 ret = 0; 887 888 /* succeeded, so commit it to the data structures */ 889 conf = &new_ctx->conf; 890 list_add(&link->assigned_chanctx_list, 891 &new_ctx->assigned_links); 892 } 893 } else { 894 ret = 0; 895 } 896 897 rcu_assign_pointer(link->conf->chanctx_conf, conf); 898 899 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) { 900 ieee80211_recalc_chanctx_chantype(local, curr_ctx); 901 ieee80211_recalc_smps_chanctx(local, curr_ctx); 902 ieee80211_recalc_radar_chanctx(local, curr_ctx); 903 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL, false); 904 } 905 906 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { 907 ieee80211_recalc_txpower(sdata, false); 908 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false); 909 } 910 911 if (conf) { 912 new_idle = false; 913 } else { 914 struct ieee80211_link_data *tmp; 915 916 new_idle = true; 917 for_each_sdata_link(local, tmp) { 918 if (rcu_access_pointer(tmp->conf->chanctx_conf)) { 919 new_idle = false; 920 break; 921 } 922 } 923 } 924 925 if (new_idle != sdata->vif.cfg.idle) { 926 sdata->vif.cfg.idle = new_idle; 927 928 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && 929 sdata->vif.type != NL80211_IFTYPE_MONITOR) 930 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE); 931 } 932 933 ieee80211_check_fast_xmit_iface(sdata); 934 935 return ret; 936 } 937 938 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 939 struct ieee80211_chanctx *chanctx) 940 { 941 struct ieee80211_sub_if_data *sdata; 942 u8 rx_chains_static, rx_chains_dynamic; 943 struct ieee80211_link_data *link; 944 945 lockdep_assert_wiphy(local->hw.wiphy); 946 947 rx_chains_static = 1; 948 rx_chains_dynamic = 1; 949 950 for_each_sdata_link(local, link) { 951 u8 needed_static, needed_dynamic; 952 953 switch (link->sdata->vif.type) { 954 case NL80211_IFTYPE_STATION: 955 if (!link->sdata->u.mgd.associated) 956 continue; 957 break; 958 case NL80211_IFTYPE_AP: 959 case NL80211_IFTYPE_ADHOC: 960 case NL80211_IFTYPE_MESH_POINT: 961 case NL80211_IFTYPE_OCB: 962 break; 963 default: 964 continue; 965 } 966 967 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf) 968 continue; 969 970 switch (link->smps_mode) { 971 default: 972 WARN_ONCE(1, "Invalid SMPS mode %d\n", 973 link->smps_mode); 974 fallthrough; 975 case IEEE80211_SMPS_OFF: 976 needed_static = link->needed_rx_chains; 977 needed_dynamic = link->needed_rx_chains; 978 break; 979 case IEEE80211_SMPS_DYNAMIC: 980 needed_static = 1; 981 needed_dynamic = link->needed_rx_chains; 982 break; 983 case IEEE80211_SMPS_STATIC: 984 needed_static = 1; 985 needed_dynamic = 1; 986 break; 987 } 988 989 rx_chains_static = max(rx_chains_static, needed_static); 990 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); 991 } 992 993 /* Disable SMPS for the monitor interface */ 994 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata); 995 if (sdata && 996 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf) 997 rx_chains_dynamic = rx_chains_static = local->rx_chains; 998 999 if (rx_chains_static == chanctx->conf.rx_chains_static && 1000 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) 1001 return; 1002 1003 chanctx->conf.rx_chains_static = rx_chains_static; 1004 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; 1005 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); 1006 } 1007 1008 static void 1009 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, 1010 bool clear) 1011 { 1012 struct ieee80211_sub_if_data *sdata = link->sdata; 1013 unsigned int link_id = link->link_id; 1014 struct ieee80211_bss_conf *link_conf = link->conf; 1015 struct ieee80211_local *local __maybe_unused = sdata->local; 1016 struct ieee80211_sub_if_data *vlan; 1017 struct ieee80211_chanctx_conf *conf; 1018 1019 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) 1020 return; 1021 1022 lockdep_assert_wiphy(local->hw.wiphy); 1023 1024 /* Check that conf exists, even when clearing this function 1025 * must be called with the AP's channel context still there 1026 * as it would otherwise cause VLANs to have an invalid 1027 * channel context pointer for a while, possibly pointing 1028 * to a channel context that has already been freed. 1029 */ 1030 conf = rcu_dereference_protected(link_conf->chanctx_conf, 1031 lockdep_is_held(&local->hw.wiphy->mtx)); 1032 WARN_ON(!conf); 1033 1034 if (clear) 1035 conf = NULL; 1036 1037 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 1038 struct ieee80211_bss_conf *vlan_conf; 1039 1040 vlan_conf = wiphy_dereference(local->hw.wiphy, 1041 vlan->vif.link_conf[link_id]); 1042 if (WARN_ON(!vlan_conf)) 1043 continue; 1044 1045 rcu_assign_pointer(vlan_conf->chanctx_conf, conf); 1046 } 1047 } 1048 1049 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, 1050 bool clear) 1051 { 1052 struct ieee80211_local *local = link->sdata->local; 1053 1054 lockdep_assert_wiphy(local->hw.wiphy); 1055 1056 __ieee80211_link_copy_chanctx_to_vlans(link, clear); 1057 } 1058 1059 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link) 1060 { 1061 struct ieee80211_sub_if_data *sdata = link->sdata; 1062 struct ieee80211_chanctx *ctx = link->reserved_chanctx; 1063 1064 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1065 1066 if (WARN_ON(!ctx)) 1067 return -EINVAL; 1068 1069 list_del(&link->reserved_chanctx_list); 1070 link->reserved_chanctx = NULL; 1071 1072 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) { 1073 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1074 if (WARN_ON(!ctx->replace_ctx)) 1075 return -EINVAL; 1076 1077 WARN_ON(ctx->replace_ctx->replace_state != 1078 IEEE80211_CHANCTX_WILL_BE_REPLACED); 1079 WARN_ON(ctx->replace_ctx->replace_ctx != ctx); 1080 1081 ctx->replace_ctx->replace_ctx = NULL; 1082 ctx->replace_ctx->replace_state = 1083 IEEE80211_CHANCTX_REPLACE_NONE; 1084 1085 list_del_rcu(&ctx->list); 1086 kfree_rcu(ctx, rcu_head); 1087 } else { 1088 ieee80211_free_chanctx(sdata->local, ctx, false); 1089 } 1090 } 1091 1092 return 0; 1093 } 1094 1095 static struct ieee80211_chanctx * 1096 ieee80211_replace_chanctx(struct ieee80211_local *local, 1097 const struct ieee80211_chan_req *chanreq, 1098 enum ieee80211_chanctx_mode mode, 1099 struct ieee80211_chanctx *curr_ctx) 1100 { 1101 struct ieee80211_chanctx *new_ctx, *ctx; 1102 struct wiphy *wiphy = local->hw.wiphy; 1103 const struct wiphy_radio *radio; 1104 1105 if (!curr_ctx || (curr_ctx->replace_state == 1106 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1107 !list_empty(&curr_ctx->reserved_links)) { 1108 /* 1109 * Another link already requested this context for a 1110 * reservation. Find another one hoping all links assigned 1111 * to it will also switch soon enough. 1112 * 1113 * TODO: This needs a little more work as some cases 1114 * (more than 2 chanctx capable devices) may fail which could 1115 * otherwise succeed provided some channel context juggling was 1116 * performed. 1117 * 1118 * Consider ctx1..3, link1..6, each ctx has 2 links. link1 and 1119 * link2 from ctx1 request new different chandefs starting 2 1120 * in-place reserations with ctx4 and ctx5 replacing ctx1 and 1121 * ctx2 respectively. Next link5 and link6 from ctx3 reserve 1122 * ctx4. If link3 and link4 remain on ctx2 as they are then this 1123 * fails unless `replace_ctx` from ctx5 is replaced with ctx3. 1124 */ 1125 list_for_each_entry(ctx, &local->chanctx_list, list) { 1126 if (ctx->replace_state != 1127 IEEE80211_CHANCTX_REPLACE_NONE) 1128 continue; 1129 1130 if (!list_empty(&ctx->reserved_links)) 1131 continue; 1132 1133 if (ctx->conf.radio_idx >= 0) { 1134 radio = &wiphy->radio[ctx->conf.radio_idx]; 1135 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper)) 1136 continue; 1137 } 1138 1139 curr_ctx = ctx; 1140 break; 1141 } 1142 } 1143 1144 /* 1145 * If that's true then all available contexts already have reservations 1146 * and cannot be used. 1147 */ 1148 if (!curr_ctx || (curr_ctx->replace_state == 1149 IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1150 !list_empty(&curr_ctx->reserved_links)) 1151 return ERR_PTR(-EBUSY); 1152 1153 new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1); 1154 if (!new_ctx) 1155 return ERR_PTR(-ENOMEM); 1156 1157 new_ctx->replace_ctx = curr_ctx; 1158 new_ctx->replace_state = IEEE80211_CHANCTX_REPLACES_OTHER; 1159 1160 curr_ctx->replace_ctx = new_ctx; 1161 curr_ctx->replace_state = IEEE80211_CHANCTX_WILL_BE_REPLACED; 1162 1163 list_add_rcu(&new_ctx->list, &local->chanctx_list); 1164 1165 return new_ctx; 1166 } 1167 1168 static bool 1169 ieee80211_find_available_radio(struct ieee80211_local *local, 1170 const struct ieee80211_chan_req *chanreq, 1171 int *radio_idx) 1172 { 1173 struct wiphy *wiphy = local->hw.wiphy; 1174 const struct wiphy_radio *radio; 1175 int i; 1176 1177 *radio_idx = -1; 1178 if (!wiphy->n_radio) 1179 return true; 1180 1181 for (i = 0; i < wiphy->n_radio; i++) { 1182 radio = &wiphy->radio[i]; 1183 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper)) 1184 continue; 1185 1186 if (!ieee80211_can_create_new_chanctx(local, i)) 1187 continue; 1188 1189 *radio_idx = i; 1190 return true; 1191 } 1192 1193 return false; 1194 } 1195 1196 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link, 1197 const struct ieee80211_chan_req *chanreq, 1198 enum ieee80211_chanctx_mode mode, 1199 bool radar_required) 1200 { 1201 struct ieee80211_sub_if_data *sdata = link->sdata; 1202 struct ieee80211_local *local = sdata->local; 1203 struct ieee80211_chanctx *new_ctx, *curr_ctx; 1204 int radio_idx; 1205 1206 lockdep_assert_wiphy(local->hw.wiphy); 1207 1208 curr_ctx = ieee80211_link_get_chanctx(link); 1209 if (curr_ctx && !local->ops->switch_vif_chanctx) 1210 return -EOPNOTSUPP; 1211 1212 new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode); 1213 if (!new_ctx) { 1214 if (ieee80211_can_create_new_chanctx(local, -1) && 1215 ieee80211_find_available_radio(local, chanreq, &radio_idx)) 1216 new_ctx = ieee80211_new_chanctx(local, chanreq, mode, 1217 false, radio_idx); 1218 else 1219 new_ctx = ieee80211_replace_chanctx(local, chanreq, 1220 mode, curr_ctx); 1221 if (IS_ERR(new_ctx)) 1222 return PTR_ERR(new_ctx); 1223 } 1224 1225 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links); 1226 link->reserved_chanctx = new_ctx; 1227 link->reserved = *chanreq; 1228 link->reserved_radar_required = radar_required; 1229 link->reserved_ready = false; 1230 1231 return 0; 1232 } 1233 1234 static void 1235 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link) 1236 { 1237 struct ieee80211_sub_if_data *sdata = link->sdata; 1238 1239 switch (sdata->vif.type) { 1240 case NL80211_IFTYPE_ADHOC: 1241 case NL80211_IFTYPE_AP: 1242 case NL80211_IFTYPE_MESH_POINT: 1243 case NL80211_IFTYPE_OCB: 1244 wiphy_work_queue(sdata->local->hw.wiphy, 1245 &link->csa.finalize_work); 1246 break; 1247 case NL80211_IFTYPE_STATION: 1248 wiphy_delayed_work_queue(sdata->local->hw.wiphy, 1249 &link->u.mgd.csa.switch_work, 0); 1250 break; 1251 case NL80211_IFTYPE_UNSPECIFIED: 1252 case NL80211_IFTYPE_AP_VLAN: 1253 case NL80211_IFTYPE_WDS: 1254 case NL80211_IFTYPE_MONITOR: 1255 case NL80211_IFTYPE_P2P_CLIENT: 1256 case NL80211_IFTYPE_P2P_GO: 1257 case NL80211_IFTYPE_P2P_DEVICE: 1258 case NL80211_IFTYPE_NAN: 1259 case NUM_NL80211_IFTYPES: 1260 WARN_ON(1); 1261 break; 1262 } 1263 } 1264 1265 static void 1266 ieee80211_link_update_chanreq(struct ieee80211_link_data *link, 1267 const struct ieee80211_chan_req *chanreq) 1268 { 1269 struct ieee80211_sub_if_data *sdata = link->sdata; 1270 unsigned int link_id = link->link_id; 1271 struct ieee80211_sub_if_data *vlan; 1272 1273 link->conf->chanreq = *chanreq; 1274 1275 if (sdata->vif.type != NL80211_IFTYPE_AP) 1276 return; 1277 1278 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { 1279 struct ieee80211_bss_conf *vlan_conf; 1280 1281 vlan_conf = wiphy_dereference(sdata->local->hw.wiphy, 1282 vlan->vif.link_conf[link_id]); 1283 if (WARN_ON(!vlan_conf)) 1284 continue; 1285 1286 vlan_conf->chanreq = *chanreq; 1287 } 1288 } 1289 1290 static int 1291 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link) 1292 { 1293 struct ieee80211_sub_if_data *sdata = link->sdata; 1294 struct ieee80211_bss_conf *link_conf = link->conf; 1295 struct ieee80211_local *local = sdata->local; 1296 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {}; 1297 struct ieee80211_chanctx *old_ctx, *new_ctx; 1298 const struct ieee80211_chan_req *chanreq; 1299 struct ieee80211_chan_req tmp; 1300 u64 changed = 0; 1301 int err; 1302 1303 lockdep_assert_wiphy(local->hw.wiphy); 1304 1305 new_ctx = link->reserved_chanctx; 1306 old_ctx = ieee80211_link_get_chanctx(link); 1307 1308 if (WARN_ON(!link->reserved_ready)) 1309 return -EBUSY; 1310 1311 if (WARN_ON(!new_ctx)) 1312 return -EINVAL; 1313 1314 if (WARN_ON(!old_ctx)) 1315 return -EINVAL; 1316 1317 if (WARN_ON(new_ctx->replace_state == 1318 IEEE80211_CHANCTX_REPLACES_OTHER)) 1319 return -EINVAL; 1320 1321 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1322 &link->reserved, 1323 &tmp); 1324 if (WARN_ON(!chanreq)) 1325 return -EINVAL; 1326 1327 if (link_conf->chanreq.oper.width != link->reserved.oper.width) 1328 changed = BSS_CHANGED_BANDWIDTH; 1329 1330 ieee80211_link_update_chanreq(link, &link->reserved); 1331 1332 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chanreq, link); 1333 1334 vif_chsw[0].vif = &sdata->vif; 1335 vif_chsw[0].old_ctx = &old_ctx->conf; 1336 vif_chsw[0].new_ctx = &new_ctx->conf; 1337 vif_chsw[0].link_conf = link->conf; 1338 1339 list_del(&link->reserved_chanctx_list); 1340 link->reserved_chanctx = NULL; 1341 1342 err = drv_switch_vif_chanctx(local, vif_chsw, 1, 1343 CHANCTX_SWMODE_REASSIGN_VIF); 1344 if (err) { 1345 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1346 ieee80211_free_chanctx(local, new_ctx, false); 1347 1348 goto out; 1349 } 1350 1351 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links); 1352 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf); 1353 1354 if (sdata->vif.type == NL80211_IFTYPE_AP) 1355 __ieee80211_link_copy_chanctx_to_vlans(link, false); 1356 1357 ieee80211_check_fast_xmit_iface(sdata); 1358 1359 if (ieee80211_chanctx_refcount(local, old_ctx) == 0) 1360 ieee80211_free_chanctx(local, old_ctx, false); 1361 1362 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false); 1363 ieee80211_recalc_smps_chanctx(local, new_ctx); 1364 ieee80211_recalc_radar_chanctx(local, new_ctx); 1365 1366 if (changed) 1367 ieee80211_link_info_change_notify(sdata, link, changed); 1368 1369 out: 1370 ieee80211_link_chanctx_reservation_complete(link); 1371 return err; 1372 } 1373 1374 static int 1375 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link) 1376 { 1377 struct ieee80211_sub_if_data *sdata = link->sdata; 1378 struct ieee80211_local *local = sdata->local; 1379 struct ieee80211_chanctx *old_ctx, *new_ctx; 1380 const struct ieee80211_chan_req *chanreq; 1381 struct ieee80211_chan_req tmp; 1382 int err; 1383 1384 old_ctx = ieee80211_link_get_chanctx(link); 1385 new_ctx = link->reserved_chanctx; 1386 1387 if (WARN_ON(!link->reserved_ready)) 1388 return -EINVAL; 1389 1390 if (WARN_ON(old_ctx)) 1391 return -EINVAL; 1392 1393 if (WARN_ON(!new_ctx)) 1394 return -EINVAL; 1395 1396 if (WARN_ON(new_ctx->replace_state == 1397 IEEE80211_CHANCTX_REPLACES_OTHER)) 1398 return -EINVAL; 1399 1400 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx, 1401 &link->reserved, 1402 &tmp); 1403 if (WARN_ON(!chanreq)) 1404 return -EINVAL; 1405 1406 ieee80211_change_chanctx(local, new_ctx, new_ctx, chanreq); 1407 1408 list_del(&link->reserved_chanctx_list); 1409 link->reserved_chanctx = NULL; 1410 1411 err = ieee80211_assign_link_chanctx(link, new_ctx, false); 1412 if (err) { 1413 if (ieee80211_chanctx_refcount(local, new_ctx) == 0) 1414 ieee80211_free_chanctx(local, new_ctx, false); 1415 1416 goto out; 1417 } 1418 1419 out: 1420 ieee80211_link_chanctx_reservation_complete(link); 1421 return err; 1422 } 1423 1424 static bool 1425 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link) 1426 { 1427 struct ieee80211_sub_if_data *sdata = link->sdata; 1428 struct ieee80211_chanctx *old_ctx, *new_ctx; 1429 1430 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1431 1432 new_ctx = link->reserved_chanctx; 1433 old_ctx = ieee80211_link_get_chanctx(link); 1434 1435 if (!old_ctx) 1436 return false; 1437 1438 if (WARN_ON(!new_ctx)) 1439 return false; 1440 1441 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1442 return false; 1443 1444 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1445 return false; 1446 1447 return true; 1448 } 1449 1450 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local, 1451 int n_vifs) 1452 { 1453 struct ieee80211_vif_chanctx_switch *vif_chsw; 1454 struct ieee80211_link_data *link; 1455 struct ieee80211_chanctx *ctx, *old_ctx; 1456 int i, err; 1457 1458 lockdep_assert_wiphy(local->hw.wiphy); 1459 1460 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL); 1461 if (!vif_chsw) 1462 return -ENOMEM; 1463 1464 i = 0; 1465 list_for_each_entry(ctx, &local->chanctx_list, list) { 1466 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1467 continue; 1468 1469 if (WARN_ON(!ctx->replace_ctx)) { 1470 err = -EINVAL; 1471 goto out; 1472 } 1473 1474 list_for_each_entry(link, &ctx->reserved_links, 1475 reserved_chanctx_list) { 1476 if (!ieee80211_link_has_in_place_reservation(link)) 1477 continue; 1478 1479 old_ctx = ieee80211_link_get_chanctx(link); 1480 vif_chsw[i].vif = &link->sdata->vif; 1481 vif_chsw[i].old_ctx = &old_ctx->conf; 1482 vif_chsw[i].new_ctx = &ctx->conf; 1483 vif_chsw[i].link_conf = link->conf; 1484 1485 i++; 1486 } 1487 } 1488 1489 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs, 1490 CHANCTX_SWMODE_SWAP_CONTEXTS); 1491 1492 out: 1493 kfree(vif_chsw); 1494 return err; 1495 } 1496 1497 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local) 1498 { 1499 struct ieee80211_chanctx *ctx; 1500 int err; 1501 1502 lockdep_assert_wiphy(local->hw.wiphy); 1503 1504 list_for_each_entry(ctx, &local->chanctx_list, list) { 1505 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1506 continue; 1507 1508 if (!list_empty(&ctx->replace_ctx->assigned_links)) 1509 continue; 1510 1511 ieee80211_del_chanctx(local, ctx->replace_ctx, false); 1512 err = ieee80211_add_chanctx(local, ctx); 1513 if (err) 1514 goto err; 1515 } 1516 1517 return 0; 1518 1519 err: 1520 WARN_ON(ieee80211_add_chanctx(local, ctx)); 1521 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) { 1522 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1523 continue; 1524 1525 if (!list_empty(&ctx->replace_ctx->assigned_links)) 1526 continue; 1527 1528 ieee80211_del_chanctx(local, ctx, false); 1529 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx)); 1530 } 1531 1532 return err; 1533 } 1534 1535 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local) 1536 { 1537 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx; 1538 int err, n_assigned, n_reserved, n_ready; 1539 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0; 1540 1541 lockdep_assert_wiphy(local->hw.wiphy); 1542 1543 /* 1544 * If there are 2 independent pairs of channel contexts performing 1545 * cross-switch of their vifs this code will still wait until both are 1546 * ready even though it could be possible to switch one before the 1547 * other is ready. 1548 * 1549 * For practical reasons and code simplicity just do a single huge 1550 * switch. 1551 */ 1552 1553 /* 1554 * Verify if the reservation is still feasible. 1555 * - if it's not then disconnect 1556 * - if it is but not all vifs necessary are ready then defer 1557 */ 1558 1559 list_for_each_entry(ctx, &local->chanctx_list, list) { 1560 struct ieee80211_link_data *link; 1561 1562 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1563 continue; 1564 1565 if (WARN_ON(!ctx->replace_ctx)) { 1566 err = -EINVAL; 1567 goto err; 1568 } 1569 1570 n_ctx++; 1571 1572 n_assigned = 0; 1573 n_reserved = 0; 1574 n_ready = 0; 1575 1576 list_for_each_entry(link, &ctx->replace_ctx->assigned_links, 1577 assigned_chanctx_list) { 1578 n_assigned++; 1579 if (link->reserved_chanctx) { 1580 n_reserved++; 1581 if (link->reserved_ready) 1582 n_ready++; 1583 } 1584 } 1585 1586 if (n_assigned != n_reserved) { 1587 if (n_ready == n_reserved) { 1588 wiphy_info(local->hw.wiphy, 1589 "channel context reservation cannot be finalized because some interfaces aren't switching\n"); 1590 err = -EBUSY; 1591 goto err; 1592 } 1593 1594 return -EAGAIN; 1595 } 1596 1597 ctx->conf.radar_enabled = false; 1598 list_for_each_entry(link, &ctx->reserved_links, 1599 reserved_chanctx_list) { 1600 if (ieee80211_link_has_in_place_reservation(link) && 1601 !link->reserved_ready) 1602 return -EAGAIN; 1603 1604 old_ctx = ieee80211_link_get_chanctx(link); 1605 if (old_ctx) { 1606 if (old_ctx->replace_state == 1607 IEEE80211_CHANCTX_WILL_BE_REPLACED) 1608 n_vifs_switch++; 1609 else 1610 n_vifs_assign++; 1611 } else { 1612 n_vifs_ctxless++; 1613 } 1614 1615 if (link->reserved_radar_required) 1616 ctx->conf.radar_enabled = true; 1617 } 1618 } 1619 1620 if (WARN_ON(n_ctx == 0) || 1621 WARN_ON(n_vifs_switch == 0 && 1622 n_vifs_assign == 0 && 1623 n_vifs_ctxless == 0)) { 1624 err = -EINVAL; 1625 goto err; 1626 } 1627 1628 /* update station rate control and min width before switch */ 1629 list_for_each_entry(ctx, &local->chanctx_list, list) { 1630 struct ieee80211_link_data *link; 1631 1632 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1633 continue; 1634 1635 if (WARN_ON(!ctx->replace_ctx)) { 1636 err = -EINVAL; 1637 goto err; 1638 } 1639 1640 list_for_each_entry(link, &ctx->reserved_links, 1641 reserved_chanctx_list) { 1642 if (!ieee80211_link_has_in_place_reservation(link)) 1643 continue; 1644 1645 ieee80211_chan_bw_change(local, 1646 ieee80211_link_get_chanctx(link), 1647 true, true); 1648 } 1649 1650 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, true); 1651 } 1652 1653 /* 1654 * All necessary vifs are ready. Perform the switch now depending on 1655 * reservations and driver capabilities. 1656 */ 1657 1658 if (n_vifs_switch > 0) { 1659 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch); 1660 if (err) 1661 goto err; 1662 } 1663 1664 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) { 1665 err = ieee80211_chsw_switch_ctxs(local); 1666 if (err) 1667 goto err; 1668 } 1669 1670 /* 1671 * Update all structures, values and pointers to point to new channel 1672 * context(s). 1673 */ 1674 list_for_each_entry(ctx, &local->chanctx_list, list) { 1675 struct ieee80211_link_data *link, *link_tmp; 1676 1677 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1678 continue; 1679 1680 if (WARN_ON(!ctx->replace_ctx)) { 1681 err = -EINVAL; 1682 goto err; 1683 } 1684 1685 list_for_each_entry(link, &ctx->reserved_links, 1686 reserved_chanctx_list) { 1687 struct ieee80211_sub_if_data *sdata = link->sdata; 1688 struct ieee80211_bss_conf *link_conf = link->conf; 1689 u64 changed = 0; 1690 1691 if (!ieee80211_link_has_in_place_reservation(link)) 1692 continue; 1693 1694 rcu_assign_pointer(link_conf->chanctx_conf, 1695 &ctx->conf); 1696 1697 if (sdata->vif.type == NL80211_IFTYPE_AP) 1698 __ieee80211_link_copy_chanctx_to_vlans(link, 1699 false); 1700 1701 ieee80211_check_fast_xmit_iface(sdata); 1702 1703 link->radar_required = link->reserved_radar_required; 1704 1705 if (link_conf->chanreq.oper.width != link->reserved.oper.width) 1706 changed = BSS_CHANGED_BANDWIDTH; 1707 1708 ieee80211_link_update_chanreq(link, &link->reserved); 1709 if (changed) 1710 ieee80211_link_info_change_notify(sdata, 1711 link, 1712 changed); 1713 1714 ieee80211_recalc_txpower(sdata, false); 1715 } 1716 1717 ieee80211_recalc_chanctx_chantype(local, ctx); 1718 ieee80211_recalc_smps_chanctx(local, ctx); 1719 ieee80211_recalc_radar_chanctx(local, ctx); 1720 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false); 1721 1722 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1723 reserved_chanctx_list) { 1724 if (ieee80211_link_get_chanctx(link) != ctx) 1725 continue; 1726 1727 list_del(&link->reserved_chanctx_list); 1728 list_move(&link->assigned_chanctx_list, 1729 &ctx->assigned_links); 1730 link->reserved_chanctx = NULL; 1731 1732 ieee80211_link_chanctx_reservation_complete(link); 1733 ieee80211_chan_bw_change(local, ctx, false, false); 1734 } 1735 1736 /* 1737 * This context might have been a dependency for an already 1738 * ready re-assign reservation interface that was deferred. Do 1739 * not propagate error to the caller though. The in-place 1740 * reservation for originally requested interface has already 1741 * succeeded at this point. 1742 */ 1743 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1744 reserved_chanctx_list) { 1745 if (WARN_ON(ieee80211_link_has_in_place_reservation(link))) 1746 continue; 1747 1748 if (WARN_ON(link->reserved_chanctx != ctx)) 1749 continue; 1750 1751 if (!link->reserved_ready) 1752 continue; 1753 1754 if (ieee80211_link_get_chanctx(link)) 1755 err = ieee80211_link_use_reserved_reassign(link); 1756 else 1757 err = ieee80211_link_use_reserved_assign(link); 1758 1759 if (err) { 1760 link_info(link, 1761 "failed to finalize (re-)assign reservation (err=%d)\n", 1762 err); 1763 ieee80211_link_unreserve_chanctx(link); 1764 cfg80211_stop_iface(local->hw.wiphy, 1765 &link->sdata->wdev, 1766 GFP_KERNEL); 1767 } 1768 } 1769 } 1770 1771 /* 1772 * Finally free old contexts 1773 */ 1774 1775 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) { 1776 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED) 1777 continue; 1778 1779 ctx->replace_ctx->replace_ctx = NULL; 1780 ctx->replace_ctx->replace_state = 1781 IEEE80211_CHANCTX_REPLACE_NONE; 1782 1783 list_del_rcu(&ctx->list); 1784 kfree_rcu(ctx, rcu_head); 1785 } 1786 1787 return 0; 1788 1789 err: 1790 list_for_each_entry(ctx, &local->chanctx_list, list) { 1791 struct ieee80211_link_data *link, *link_tmp; 1792 1793 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) 1794 continue; 1795 1796 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, 1797 reserved_chanctx_list) { 1798 ieee80211_link_unreserve_chanctx(link); 1799 ieee80211_link_chanctx_reservation_complete(link); 1800 } 1801 } 1802 1803 return err; 1804 } 1805 1806 void __ieee80211_link_release_channel(struct ieee80211_link_data *link, 1807 bool skip_idle_recalc) 1808 { 1809 struct ieee80211_sub_if_data *sdata = link->sdata; 1810 struct ieee80211_bss_conf *link_conf = link->conf; 1811 struct ieee80211_local *local = sdata->local; 1812 struct ieee80211_chanctx_conf *conf; 1813 struct ieee80211_chanctx *ctx; 1814 bool use_reserved_switch = false; 1815 1816 lockdep_assert_wiphy(local->hw.wiphy); 1817 1818 conf = rcu_dereference_protected(link_conf->chanctx_conf, 1819 lockdep_is_held(&local->hw.wiphy->mtx)); 1820 if (!conf) 1821 return; 1822 1823 ctx = container_of(conf, struct ieee80211_chanctx, conf); 1824 1825 if (link->reserved_chanctx) { 1826 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER && 1827 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1) 1828 use_reserved_switch = true; 1829 1830 ieee80211_link_unreserve_chanctx(link); 1831 } 1832 1833 ieee80211_assign_link_chanctx(link, NULL, false); 1834 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1835 ieee80211_free_chanctx(local, ctx, skip_idle_recalc); 1836 1837 link->radar_required = false; 1838 1839 /* Unreserving may ready an in-place reservation. */ 1840 if (use_reserved_switch) 1841 ieee80211_vif_use_reserved_switch(local); 1842 } 1843 1844 int _ieee80211_link_use_channel(struct ieee80211_link_data *link, 1845 const struct ieee80211_chan_req *chanreq, 1846 enum ieee80211_chanctx_mode mode, 1847 bool assign_on_failure) 1848 { 1849 struct ieee80211_sub_if_data *sdata = link->sdata; 1850 struct ieee80211_local *local = sdata->local; 1851 struct ieee80211_chanctx *ctx; 1852 u8 radar_detect_width = 0; 1853 bool reserved = false; 1854 int radio_idx; 1855 int ret; 1856 1857 lockdep_assert_wiphy(local->hw.wiphy); 1858 1859 if (!ieee80211_vif_link_active(&sdata->vif, link->link_id)) { 1860 ieee80211_link_update_chanreq(link, chanreq); 1861 return 0; 1862 } 1863 1864 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1865 &chanreq->oper, 1866 sdata->wdev.iftype); 1867 if (ret < 0) 1868 goto out; 1869 if (ret > 0) 1870 radar_detect_width = BIT(chanreq->oper.width); 1871 1872 link->radar_required = ret; 1873 1874 ret = ieee80211_check_combinations(sdata, &chanreq->oper, mode, 1875 radar_detect_width, -1); 1876 if (ret < 0) 1877 goto out; 1878 1879 __ieee80211_link_release_channel(link, false); 1880 1881 ctx = ieee80211_find_chanctx(local, link, chanreq, mode); 1882 /* Note: context is now reserved */ 1883 if (ctx) 1884 reserved = true; 1885 else if (!ieee80211_find_available_radio(local, chanreq, &radio_idx)) 1886 ctx = ERR_PTR(-EBUSY); 1887 else 1888 ctx = ieee80211_new_chanctx(local, chanreq, mode, 1889 assign_on_failure, radio_idx); 1890 if (IS_ERR(ctx)) { 1891 ret = PTR_ERR(ctx); 1892 goto out; 1893 } 1894 1895 ieee80211_link_update_chanreq(link, chanreq); 1896 1897 ret = ieee80211_assign_link_chanctx(link, ctx, assign_on_failure); 1898 1899 if (reserved) { 1900 /* remove reservation */ 1901 WARN_ON(link->reserved_chanctx != ctx); 1902 link->reserved_chanctx = NULL; 1903 list_del(&link->reserved_chanctx_list); 1904 } 1905 1906 if (ret) { 1907 /* if assign fails refcount stays the same */ 1908 if (ieee80211_chanctx_refcount(local, ctx) == 0) 1909 ieee80211_free_chanctx(local, ctx, false); 1910 goto out; 1911 } 1912 1913 ieee80211_recalc_smps_chanctx(local, ctx); 1914 ieee80211_recalc_radar_chanctx(local, ctx); 1915 out: 1916 if (ret) 1917 link->radar_required = false; 1918 1919 return ret; 1920 } 1921 1922 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link) 1923 { 1924 struct ieee80211_sub_if_data *sdata = link->sdata; 1925 struct ieee80211_local *local = sdata->local; 1926 struct ieee80211_chanctx *new_ctx; 1927 struct ieee80211_chanctx *old_ctx; 1928 int err; 1929 1930 lockdep_assert_wiphy(local->hw.wiphy); 1931 1932 new_ctx = link->reserved_chanctx; 1933 old_ctx = ieee80211_link_get_chanctx(link); 1934 1935 if (WARN_ON(!new_ctx)) 1936 return -EINVAL; 1937 1938 if (WARN_ON(new_ctx->replace_state == 1939 IEEE80211_CHANCTX_WILL_BE_REPLACED)) 1940 return -EINVAL; 1941 1942 if (WARN_ON(link->reserved_ready)) 1943 return -EINVAL; 1944 1945 link->reserved_ready = true; 1946 1947 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { 1948 if (old_ctx) 1949 return ieee80211_link_use_reserved_reassign(link); 1950 1951 return ieee80211_link_use_reserved_assign(link); 1952 } 1953 1954 /* 1955 * In-place reservation may need to be finalized now either if: 1956 * a) sdata is taking part in the swapping itself and is the last one 1957 * b) sdata has switched with a re-assign reservation to an existing 1958 * context readying in-place switching of old_ctx 1959 * 1960 * In case of (b) do not propagate the error up because the requested 1961 * sdata already switched successfully. Just spill an extra warning. 1962 * The ieee80211_vif_use_reserved_switch() already stops all necessary 1963 * interfaces upon failure. 1964 */ 1965 if ((old_ctx && 1966 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) || 1967 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) { 1968 err = ieee80211_vif_use_reserved_switch(local); 1969 if (err && err != -EAGAIN) { 1970 if (new_ctx->replace_state == 1971 IEEE80211_CHANCTX_REPLACES_OTHER) 1972 return err; 1973 1974 wiphy_info(local->hw.wiphy, 1975 "depending in-place reservation failed (err=%d)\n", 1976 err); 1977 } 1978 } 1979 1980 return 0; 1981 } 1982 1983 /* 1984 * This is similar to ieee80211_chanctx_compatible(), but rechecks 1985 * against all the links actually using it (except the one that's 1986 * passed, since that one is changing). 1987 * This is done in order to allow changes to the AP's bandwidth for 1988 * wider bandwidth OFDMA purposes, which wouldn't be treated as 1989 * compatible by ieee80211_chanctx_recheck() but is OK if the link 1990 * requesting the update is the only one using it. 1991 */ 1992 static const struct ieee80211_chan_req * 1993 ieee80211_chanctx_recheck(struct ieee80211_local *local, 1994 struct ieee80211_link_data *skip_link, 1995 struct ieee80211_chanctx *ctx, 1996 const struct ieee80211_chan_req *req, 1997 struct ieee80211_chan_req *tmp) 1998 { 1999 const struct ieee80211_chan_req *ret = req; 2000 struct ieee80211_link_data *link; 2001 2002 lockdep_assert_wiphy(local->hw.wiphy); 2003 2004 for_each_sdata_link(local, link) { 2005 if (link == skip_link) 2006 continue; 2007 2008 if (rcu_access_pointer(link->conf->chanctx_conf) == &ctx->conf) { 2009 ret = ieee80211_chanreq_compatible(ret, 2010 &link->conf->chanreq, 2011 tmp); 2012 if (!ret) 2013 return NULL; 2014 } 2015 2016 if (link->reserved_chanctx == ctx) { 2017 ret = ieee80211_chanreq_compatible(ret, 2018 &link->reserved, 2019 tmp); 2020 if (!ret) 2021 return NULL; 2022 } 2023 } 2024 2025 *tmp = *ret; 2026 return tmp; 2027 } 2028 2029 int ieee80211_link_change_chanreq(struct ieee80211_link_data *link, 2030 const struct ieee80211_chan_req *chanreq, 2031 u64 *changed) 2032 { 2033 struct ieee80211_sub_if_data *sdata = link->sdata; 2034 struct ieee80211_bss_conf *link_conf = link->conf; 2035 struct ieee80211_local *local = sdata->local; 2036 struct ieee80211_chanctx_conf *conf; 2037 struct ieee80211_chanctx *ctx; 2038 const struct ieee80211_chan_req *compat; 2039 struct ieee80211_chan_req tmp; 2040 2041 lockdep_assert_wiphy(local->hw.wiphy); 2042 2043 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, 2044 &chanreq->oper, 2045 IEEE80211_CHAN_DISABLED)) 2046 return -EINVAL; 2047 2048 /* for non-HT 20 MHz the rest doesn't matter */ 2049 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT && 2050 cfg80211_chandef_identical(&chanreq->oper, &link_conf->chanreq.oper)) 2051 return 0; 2052 2053 /* but you cannot switch to/from it */ 2054 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT || 2055 link_conf->chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT) 2056 return -EINVAL; 2057 2058 conf = rcu_dereference_protected(link_conf->chanctx_conf, 2059 lockdep_is_held(&local->hw.wiphy->mtx)); 2060 if (!conf) 2061 return -EINVAL; 2062 2063 ctx = container_of(conf, struct ieee80211_chanctx, conf); 2064 2065 compat = ieee80211_chanctx_recheck(local, link, ctx, chanreq, &tmp); 2066 if (!compat) 2067 return -EINVAL; 2068 2069 switch (ctx->replace_state) { 2070 case IEEE80211_CHANCTX_REPLACE_NONE: 2071 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, compat, 2072 &tmp)) 2073 return -EBUSY; 2074 break; 2075 case IEEE80211_CHANCTX_WILL_BE_REPLACED: 2076 /* TODO: Perhaps the bandwidth change could be treated as a 2077 * reservation itself? */ 2078 return -EBUSY; 2079 case IEEE80211_CHANCTX_REPLACES_OTHER: 2080 /* channel context that is going to replace another channel 2081 * context doesn't really exist and shouldn't be assigned 2082 * anywhere yet */ 2083 WARN_ON(1); 2084 break; 2085 } 2086 2087 ieee80211_link_update_chanreq(link, chanreq); 2088 2089 ieee80211_recalc_chanctx_chantype(local, ctx); 2090 2091 *changed |= BSS_CHANGED_BANDWIDTH; 2092 return 0; 2093 } 2094 2095 void ieee80211_link_release_channel(struct ieee80211_link_data *link) 2096 { 2097 struct ieee80211_sub_if_data *sdata = link->sdata; 2098 2099 lockdep_assert_wiphy(sdata->local->hw.wiphy); 2100 2101 if (rcu_access_pointer(link->conf->chanctx_conf)) 2102 __ieee80211_link_release_channel(link, false); 2103 } 2104 2105 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link) 2106 { 2107 struct ieee80211_sub_if_data *sdata = link->sdata; 2108 unsigned int link_id = link->link_id; 2109 struct ieee80211_bss_conf *link_conf = link->conf; 2110 struct ieee80211_bss_conf *ap_conf; 2111 struct ieee80211_local *local = sdata->local; 2112 struct ieee80211_sub_if_data *ap; 2113 struct ieee80211_chanctx_conf *conf; 2114 2115 lockdep_assert_wiphy(local->hw.wiphy); 2116 2117 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) 2118 return; 2119 2120 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 2121 2122 ap_conf = wiphy_dereference(local->hw.wiphy, 2123 ap->vif.link_conf[link_id]); 2124 conf = wiphy_dereference(local->hw.wiphy, 2125 ap_conf->chanctx_conf); 2126 rcu_assign_pointer(link_conf->chanctx_conf, conf); 2127 } 2128 2129 void ieee80211_iter_chan_contexts_atomic( 2130 struct ieee80211_hw *hw, 2131 void (*iter)(struct ieee80211_hw *hw, 2132 struct ieee80211_chanctx_conf *chanctx_conf, 2133 void *data), 2134 void *iter_data) 2135 { 2136 struct ieee80211_local *local = hw_to_local(hw); 2137 struct ieee80211_chanctx *ctx; 2138 2139 rcu_read_lock(); 2140 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) 2141 if (ctx->driver_present) 2142 iter(hw, &ctx->conf, iter_data); 2143 rcu_read_unlock(); 2144 } 2145 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); 2146