1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mac80211 - channel management
4 * Copyright 2020 - 2022 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
ieee80211_chanctx_num_assigned(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)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_held(&local->chanctx_mtx);
22
23 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list)
24 num++;
25
26 return num;
27 }
28
ieee80211_chanctx_num_reserved(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)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_held(&local->chanctx_mtx);
36
37 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list)
38 num++;
39
40 return num;
41 }
42
ieee80211_chanctx_refcount(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)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
ieee80211_num_chanctx(struct ieee80211_local * local)50 static int ieee80211_num_chanctx(struct ieee80211_local *local)
51 {
52 struct ieee80211_chanctx *ctx;
53 int num = 0;
54
55 lockdep_assert_held(&local->chanctx_mtx);
56
57 list_for_each_entry(ctx, &local->chanctx_list, list)
58 num++;
59
60 return num;
61 }
62
ieee80211_can_create_new_chanctx(struct ieee80211_local * local)63 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
64 {
65 lockdep_assert_held(&local->chanctx_mtx);
66 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
67 }
68
69 static struct ieee80211_chanctx *
ieee80211_link_get_chanctx(struct ieee80211_link_data * link)70 ieee80211_link_get_chanctx(struct ieee80211_link_data *link)
71 {
72 struct ieee80211_local *local __maybe_unused = link->sdata->local;
73 struct ieee80211_chanctx_conf *conf;
74
75 conf = rcu_dereference_protected(link->conf->chanctx_conf,
76 lockdep_is_held(&local->chanctx_mtx));
77 if (!conf)
78 return NULL;
79
80 return container_of(conf, struct ieee80211_chanctx, conf);
81 }
82
83 static const struct cfg80211_chan_def *
ieee80211_chanctx_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)84 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
85 struct ieee80211_chanctx *ctx,
86 const struct cfg80211_chan_def *compat)
87 {
88 struct ieee80211_link_data *link;
89
90 lockdep_assert_held(&local->chanctx_mtx);
91
92 list_for_each_entry(link, &ctx->reserved_links,
93 reserved_chanctx_list) {
94 if (!compat)
95 compat = &link->reserved_chandef;
96
97 compat = cfg80211_chandef_compatible(&link->reserved_chandef,
98 compat);
99 if (!compat)
100 break;
101 }
102
103 return compat;
104 }
105
106 static const struct cfg80211_chan_def *
ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)107 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
108 struct ieee80211_chanctx *ctx,
109 const struct cfg80211_chan_def *compat)
110 {
111 struct ieee80211_link_data *link;
112
113 lockdep_assert_held(&local->chanctx_mtx);
114
115 list_for_each_entry(link, &ctx->assigned_links,
116 assigned_chanctx_list) {
117 struct ieee80211_bss_conf *link_conf = link->conf;
118
119 if (link->reserved_chanctx)
120 continue;
121
122 if (!compat)
123 compat = &link_conf->chandef;
124
125 compat = cfg80211_chandef_compatible(
126 &link_conf->chandef, compat);
127 if (!compat)
128 break;
129 }
130
131 return compat;
132 }
133
134 static const struct cfg80211_chan_def *
ieee80211_chanctx_combined_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)135 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
136 struct ieee80211_chanctx *ctx,
137 const struct cfg80211_chan_def *compat)
138 {
139 lockdep_assert_held(&local->chanctx_mtx);
140
141 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
142 if (!compat)
143 return NULL;
144
145 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
146 if (!compat)
147 return NULL;
148
149 return compat;
150 }
151
152 static bool
ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * def)153 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
154 struct ieee80211_chanctx *ctx,
155 const struct cfg80211_chan_def *def)
156 {
157 lockdep_assert_held(&local->chanctx_mtx);
158
159 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
160 return true;
161
162 if (!list_empty(&ctx->reserved_links) &&
163 ieee80211_chanctx_reserved_chandef(local, ctx, def))
164 return true;
165
166 return false;
167 }
168
169 static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)170 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
171 const struct cfg80211_chan_def *chandef,
172 enum ieee80211_chanctx_mode mode)
173 {
174 struct ieee80211_chanctx *ctx;
175
176 lockdep_assert_held(&local->chanctx_mtx);
177
178 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
179 return NULL;
180
181 list_for_each_entry(ctx, &local->chanctx_list, list) {
182 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
183 continue;
184
185 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
186 continue;
187
188 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
189 chandef))
190 continue;
191
192 return ctx;
193 }
194
195 return NULL;
196 }
197
ieee80211_get_sta_bw(struct sta_info * sta,unsigned int link_id)198 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta,
199 unsigned int link_id)
200 {
201 enum ieee80211_sta_rx_bandwidth width;
202 struct link_sta_info *link_sta;
203
204 link_sta = rcu_dereference(sta->link[link_id]);
205
206 /* no effect if this STA has no presence on this link */
207 if (!link_sta)
208 return NL80211_CHAN_WIDTH_20_NOHT;
209
210 width = ieee80211_sta_cap_rx_bw(link_sta);
211
212 switch (width) {
213 case IEEE80211_STA_RX_BW_20:
214 if (link_sta->pub->ht_cap.ht_supported)
215 return NL80211_CHAN_WIDTH_20;
216 else
217 return NL80211_CHAN_WIDTH_20_NOHT;
218 case IEEE80211_STA_RX_BW_40:
219 return NL80211_CHAN_WIDTH_40;
220 case IEEE80211_STA_RX_BW_80:
221 return NL80211_CHAN_WIDTH_80;
222 case IEEE80211_STA_RX_BW_160:
223 /*
224 * This applied for both 160 and 80+80. since we use
225 * the returned value to consider degradation of
226 * ctx->conf.min_def, we have to make sure to take
227 * the bigger one (NL80211_CHAN_WIDTH_160).
228 * Otherwise we might try degrading even when not
229 * needed, as the max required sta_bw returned (80+80)
230 * might be smaller than the configured bw (160).
231 */
232 return NL80211_CHAN_WIDTH_160;
233 case IEEE80211_STA_RX_BW_320:
234 return NL80211_CHAN_WIDTH_320;
235 default:
236 WARN_ON(1);
237 return NL80211_CHAN_WIDTH_20;
238 }
239 }
240
241 static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_sub_if_data * sdata,unsigned int link_id)242 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata,
243 unsigned int link_id)
244 {
245 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
246 struct sta_info *sta;
247
248 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
249 if (sdata != sta->sdata &&
250 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
251 continue;
252
253 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id));
254 }
255
256 return max_bw;
257 }
258
259 static enum nl80211_chan_width
ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data * sdata,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)260 ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data *sdata,
261 struct ieee80211_chanctx *ctx,
262 struct ieee80211_link_data *rsvd_for)
263 {
264 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
265 struct ieee80211_vif *vif = &sdata->vif;
266 int link_id;
267
268 rcu_read_lock();
269 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
270 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
271 struct ieee80211_link_data *link =
272 rcu_dereference(sdata->link[link_id]);
273
274 if (!link)
275 continue;
276
277 if (link != rsvd_for &&
278 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf)
279 continue;
280
281 switch (vif->type) {
282 case NL80211_IFTYPE_AP:
283 case NL80211_IFTYPE_AP_VLAN:
284 width = ieee80211_get_max_required_bw(sdata, link_id);
285 break;
286 case NL80211_IFTYPE_STATION:
287 /*
288 * The ap's sta->bandwidth is not set yet at this
289 * point, so take the width from the chandef, but
290 * account also for TDLS peers
291 */
292 width = max(link->conf->chandef.width,
293 ieee80211_get_max_required_bw(sdata, link_id));
294 break;
295 case NL80211_IFTYPE_P2P_DEVICE:
296 case NL80211_IFTYPE_NAN:
297 continue;
298 case NL80211_IFTYPE_ADHOC:
299 case NL80211_IFTYPE_MESH_POINT:
300 case NL80211_IFTYPE_OCB:
301 width = link->conf->chandef.width;
302 break;
303 case NL80211_IFTYPE_WDS:
304 case NL80211_IFTYPE_UNSPECIFIED:
305 case NUM_NL80211_IFTYPES:
306 case NL80211_IFTYPE_MONITOR:
307 case NL80211_IFTYPE_P2P_CLIENT:
308 case NL80211_IFTYPE_P2P_GO:
309 WARN_ON_ONCE(1);
310 }
311
312 max_bw = max(max_bw, width);
313 }
314 rcu_read_unlock();
315
316 return max_bw;
317 }
318
319 static enum nl80211_chan_width
ieee80211_get_chanctx_max_required_bw(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)320 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
321 struct ieee80211_chanctx *ctx,
322 struct ieee80211_link_data *rsvd_for)
323 {
324 struct ieee80211_sub_if_data *sdata;
325 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
326
327 rcu_read_lock();
328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
329 enum nl80211_chan_width width;
330
331 if (!ieee80211_sdata_running(sdata))
332 continue;
333
334 width = ieee80211_get_chanctx_vif_max_required_bw(sdata, ctx,
335 rsvd_for);
336
337 max_bw = max(max_bw, width);
338 }
339
340 /* use the configured bandwidth in case of monitor interface */
341 sdata = rcu_dereference(local->monitor_sdata);
342 if (sdata &&
343 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf)
344 max_bw = max(max_bw, ctx->conf.def.width);
345
346 rcu_read_unlock();
347
348 return max_bw;
349 }
350
351 /*
352 * recalc the min required chan width of the channel context, which is
353 * the max of min required widths of all the interfaces bound to this
354 * channel context.
355 */
356 static u32
_ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)357 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
358 struct ieee80211_chanctx *ctx,
359 struct ieee80211_link_data *rsvd_for)
360 {
361 enum nl80211_chan_width max_bw;
362 struct cfg80211_chan_def min_def;
363
364 lockdep_assert_held(&local->chanctx_mtx);
365
366 /* don't optimize non-20MHz based and radar_enabled confs */
367 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
368 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
369 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
370 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
371 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
372 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
373 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
374 ctx->conf.radar_enabled) {
375 ctx->conf.min_def = ctx->conf.def;
376 return 0;
377 }
378
379 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for);
380
381 /* downgrade chandef up to max_bw */
382 min_def = ctx->conf.def;
383 while (min_def.width > max_bw)
384 ieee80211_chandef_downgrade(&min_def);
385
386 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
387 return 0;
388
389 ctx->conf.min_def = min_def;
390 if (!ctx->driver_present)
391 return 0;
392
393 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
394 }
395
396 /* calling this function is assuming that station vif is updated to
397 * lates changes by calling ieee80211_link_update_chandef
398 */
ieee80211_chan_bw_change(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool narrowed)399 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
400 struct ieee80211_chanctx *ctx,
401 bool narrowed)
402 {
403 struct sta_info *sta;
404 struct ieee80211_supported_band *sband =
405 local->hw.wiphy->bands[ctx->conf.def.chan->band];
406
407 rcu_read_lock();
408 list_for_each_entry_rcu(sta, &local->sta_list,
409 list) {
410 struct ieee80211_sub_if_data *sdata = sta->sdata;
411 enum ieee80211_sta_rx_bandwidth new_sta_bw;
412 unsigned int link_id;
413
414 if (!ieee80211_sdata_running(sta->sdata))
415 continue;
416
417 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
418 struct ieee80211_bss_conf *link_conf =
419 rcu_dereference(sdata->vif.link_conf[link_id]);
420 struct link_sta_info *link_sta;
421
422 if (!link_conf)
423 continue;
424
425 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf)
426 continue;
427
428 link_sta = rcu_dereference(sta->link[link_id]);
429 if (!link_sta)
430 continue;
431
432 new_sta_bw = ieee80211_sta_cur_vht_bw(link_sta);
433
434 /* nothing change */
435 if (new_sta_bw == link_sta->pub->bandwidth)
436 continue;
437
438 /* vif changed to narrow BW and narrow BW for station wasn't
439 * requested or vise versa */
440 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed)
441 continue;
442
443 link_sta->pub->bandwidth = new_sta_bw;
444 rate_control_rate_update(local, sband, sta, link_id,
445 IEEE80211_RC_BW_CHANGED);
446 }
447 }
448 rcu_read_unlock();
449 }
450
451 /*
452 * recalc the min required chan width of the channel context, which is
453 * the max of min required widths of all the interfaces bound to this
454 * channel context.
455 */
ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)456 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
457 struct ieee80211_chanctx *ctx,
458 struct ieee80211_link_data *rsvd_for)
459 {
460 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
461
462 if (!changed)
463 return;
464
465 /* check is BW narrowed */
466 ieee80211_chan_bw_change(local, ctx, true);
467
468 drv_change_chanctx(local, ctx, changed);
469
470 /* check is BW wider */
471 ieee80211_chan_bw_change(local, ctx, false);
472 }
473
_ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct cfg80211_chan_def * chandef,struct ieee80211_link_data * rsvd_for)474 static void _ieee80211_change_chanctx(struct ieee80211_local *local,
475 struct ieee80211_chanctx *ctx,
476 struct ieee80211_chanctx *old_ctx,
477 const struct cfg80211_chan_def *chandef,
478 struct ieee80211_link_data *rsvd_for)
479 {
480 u32 changed;
481
482 /* expected to handle only 20/40/80/160/320 channel widths */
483 switch (chandef->width) {
484 case NL80211_CHAN_WIDTH_20_NOHT:
485 case NL80211_CHAN_WIDTH_20:
486 case NL80211_CHAN_WIDTH_40:
487 case NL80211_CHAN_WIDTH_80:
488 case NL80211_CHAN_WIDTH_80P80:
489 case NL80211_CHAN_WIDTH_160:
490 case NL80211_CHAN_WIDTH_320:
491 break;
492 default:
493 WARN_ON(1);
494 }
495
496 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
497 * due to maybe not returning from it, e.g in case new context was added
498 * first time with all parameters up to date.
499 */
500 ieee80211_chan_bw_change(local, old_ctx, true);
501
502 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
503 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
504 return;
505 }
506
507 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
508
509 ctx->conf.def = *chandef;
510
511 /* check if min chanctx also changed */
512 changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
513 _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
514 drv_change_chanctx(local, ctx, changed);
515
516 if (!local->use_chanctx) {
517 local->_oper_chandef = *chandef;
518 ieee80211_hw_config(local, 0);
519 }
520
521 /* check is BW wider */
522 ieee80211_chan_bw_change(local, old_ctx, false);
523 }
524
ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct cfg80211_chan_def * chandef)525 static void ieee80211_change_chanctx(struct ieee80211_local *local,
526 struct ieee80211_chanctx *ctx,
527 struct ieee80211_chanctx *old_ctx,
528 const struct cfg80211_chan_def *chandef)
529 {
530 _ieee80211_change_chanctx(local, ctx, old_ctx, chandef, NULL);
531 }
532
533 static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)534 ieee80211_find_chanctx(struct ieee80211_local *local,
535 const struct cfg80211_chan_def *chandef,
536 enum ieee80211_chanctx_mode mode)
537 {
538 struct ieee80211_chanctx *ctx;
539
540 lockdep_assert_held(&local->chanctx_mtx);
541
542 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
543 return NULL;
544
545 list_for_each_entry(ctx, &local->chanctx_list, list) {
546 const struct cfg80211_chan_def *compat;
547
548 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
549 continue;
550
551 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
552 continue;
553
554 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
555 if (!compat)
556 continue;
557
558 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
559 compat);
560 if (!compat)
561 continue;
562
563 ieee80211_change_chanctx(local, ctx, ctx, compat);
564
565 return ctx;
566 }
567
568 return NULL;
569 }
570
ieee80211_is_radar_required(struct ieee80211_local * local)571 bool ieee80211_is_radar_required(struct ieee80211_local *local)
572 {
573 struct ieee80211_sub_if_data *sdata;
574
575 lockdep_assert_held(&local->mtx);
576
577 rcu_read_lock();
578 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
579 unsigned int link_id;
580
581 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
582 struct ieee80211_link_data *link;
583
584 link = rcu_dereference(sdata->link[link_id]);
585
586 if (link && link->radar_required) {
587 rcu_read_unlock();
588 return true;
589 }
590 }
591 }
592 rcu_read_unlock();
593
594 return false;
595 }
596
597 static bool
ieee80211_chanctx_radar_required(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)598 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
599 struct ieee80211_chanctx *ctx)
600 {
601 struct ieee80211_chanctx_conf *conf = &ctx->conf;
602 struct ieee80211_sub_if_data *sdata;
603 bool required = false;
604
605 lockdep_assert_held(&local->chanctx_mtx);
606 lockdep_assert_held(&local->mtx);
607
608 rcu_read_lock();
609 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
610 unsigned int link_id;
611
612 if (!ieee80211_sdata_running(sdata))
613 continue;
614 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
615 struct ieee80211_link_data *link;
616
617 link = rcu_dereference(sdata->link[link_id]);
618 if (!link)
619 continue;
620
621 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
622 continue;
623 if (!link->radar_required)
624 continue;
625 required = true;
626 break;
627 }
628
629 if (required)
630 break;
631 }
632 rcu_read_unlock();
633
634 return required;
635 }
636
637 static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)638 ieee80211_alloc_chanctx(struct ieee80211_local *local,
639 const struct cfg80211_chan_def *chandef,
640 enum ieee80211_chanctx_mode mode)
641 {
642 struct ieee80211_chanctx *ctx;
643
644 lockdep_assert_held(&local->chanctx_mtx);
645
646 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
647 if (!ctx)
648 return NULL;
649
650 INIT_LIST_HEAD(&ctx->assigned_links);
651 INIT_LIST_HEAD(&ctx->reserved_links);
652 ctx->conf.def = *chandef;
653 ctx->conf.rx_chains_static = 1;
654 ctx->conf.rx_chains_dynamic = 1;
655 ctx->mode = mode;
656 ctx->conf.radar_enabled = false;
657 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
658
659 return ctx;
660 }
661
ieee80211_add_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)662 static int ieee80211_add_chanctx(struct ieee80211_local *local,
663 struct ieee80211_chanctx *ctx)
664 {
665 u32 changed;
666 int err;
667
668 lockdep_assert_held(&local->mtx);
669 lockdep_assert_held(&local->chanctx_mtx);
670
671 if (!local->use_chanctx)
672 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
673
674 /* turn idle off *before* setting channel -- some drivers need that */
675 changed = ieee80211_idle_off(local);
676 if (changed)
677 ieee80211_hw_config(local, changed);
678
679 if (!local->use_chanctx) {
680 local->_oper_chandef = ctx->conf.def;
681 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
682 } else {
683 err = drv_add_chanctx(local, ctx);
684 if (err) {
685 ieee80211_recalc_idle(local);
686 return err;
687 }
688 }
689
690 return 0;
691 }
692
693 static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)694 ieee80211_new_chanctx(struct ieee80211_local *local,
695 const struct cfg80211_chan_def *chandef,
696 enum ieee80211_chanctx_mode mode)
697 {
698 struct ieee80211_chanctx *ctx;
699 int err;
700
701 lockdep_assert_held(&local->mtx);
702 lockdep_assert_held(&local->chanctx_mtx);
703
704 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
705 if (!ctx)
706 return ERR_PTR(-ENOMEM);
707
708 err = ieee80211_add_chanctx(local, ctx);
709 if (err) {
710 kfree(ctx);
711 return ERR_PTR(err);
712 }
713
714 list_add_rcu(&ctx->list, &local->chanctx_list);
715 return ctx;
716 }
717
ieee80211_del_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)718 static void ieee80211_del_chanctx(struct ieee80211_local *local,
719 struct ieee80211_chanctx *ctx)
720 {
721 lockdep_assert_held(&local->chanctx_mtx);
722
723 if (!local->use_chanctx) {
724 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
725 /* S1G doesn't have 20MHz, so get the correct width for the
726 * current channel.
727 */
728 if (chandef->chan->band == NL80211_BAND_S1GHZ)
729 chandef->width =
730 ieee80211_s1g_channel_width(chandef->chan);
731 else
732 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
733 chandef->center_freq1 = chandef->chan->center_freq;
734 chandef->freq1_offset = chandef->chan->freq_offset;
735 chandef->center_freq2 = 0;
736
737 /* NOTE: Disabling radar is only valid here for
738 * single channel context. To be sure, check it ...
739 */
740 WARN_ON(local->hw.conf.radar_enabled &&
741 !list_empty(&local->chanctx_list));
742
743 local->hw.conf.radar_enabled = false;
744
745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
746 } else {
747 drv_remove_chanctx(local, ctx);
748 }
749
750 ieee80211_recalc_idle(local);
751 }
752
ieee80211_free_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)753 static void ieee80211_free_chanctx(struct ieee80211_local *local,
754 struct ieee80211_chanctx *ctx)
755 {
756 lockdep_assert_held(&local->chanctx_mtx);
757
758 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
759
760 list_del_rcu(&ctx->list);
761 ieee80211_del_chanctx(local, ctx);
762 kfree_rcu(ctx, rcu_head);
763 }
764
ieee80211_recalc_chanctx_chantype(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)765 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
766 struct ieee80211_chanctx *ctx)
767 {
768 struct ieee80211_chanctx_conf *conf = &ctx->conf;
769 struct ieee80211_sub_if_data *sdata;
770 const struct cfg80211_chan_def *compat = NULL;
771 struct sta_info *sta;
772
773 lockdep_assert_held(&local->chanctx_mtx);
774
775 rcu_read_lock();
776 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
777 int link_id;
778
779 if (!ieee80211_sdata_running(sdata))
780 continue;
781
782 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
783 continue;
784
785 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
786 struct ieee80211_bss_conf *link_conf =
787 rcu_dereference(sdata->vif.link_conf[link_id]);
788
789 if (!link_conf)
790 continue;
791
792 if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
793 continue;
794
795 if (!compat)
796 compat = &link_conf->chandef;
797
798 compat = cfg80211_chandef_compatible(&link_conf->chandef,
799 compat);
800 if (WARN_ON_ONCE(!compat))
801 break;
802 }
803 }
804
805 /* TDLS peers can sometimes affect the chandef width */
806 list_for_each_entry_rcu(sta, &local->sta_list, list) {
807 if (!sta->uploaded ||
808 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
809 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
810 !sta->tdls_chandef.chan)
811 continue;
812
813 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
814 compat);
815 if (WARN_ON_ONCE(!compat))
816 break;
817 }
818 rcu_read_unlock();
819
820 if (!compat)
821 return;
822
823 ieee80211_change_chanctx(local, ctx, ctx, compat);
824 }
825
ieee80211_recalc_radar_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)826 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
827 struct ieee80211_chanctx *chanctx)
828 {
829 bool radar_enabled;
830
831 lockdep_assert_held(&local->chanctx_mtx);
832 /* for ieee80211_is_radar_required */
833 lockdep_assert_held(&local->mtx);
834
835 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
836
837 if (radar_enabled == chanctx->conf.radar_enabled)
838 return;
839
840 chanctx->conf.radar_enabled = radar_enabled;
841
842 if (!local->use_chanctx) {
843 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
844 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
845 }
846
847 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
848 }
849
ieee80211_assign_link_chanctx(struct ieee80211_link_data * link,struct ieee80211_chanctx * new_ctx)850 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
851 struct ieee80211_chanctx *new_ctx)
852 {
853 struct ieee80211_sub_if_data *sdata = link->sdata;
854 struct ieee80211_local *local = sdata->local;
855 struct ieee80211_chanctx_conf *conf;
856 struct ieee80211_chanctx *curr_ctx = NULL;
857 int ret = 0;
858
859 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
860 return -ENOTSUPP;
861
862 conf = rcu_dereference_protected(link->conf->chanctx_conf,
863 lockdep_is_held(&local->chanctx_mtx));
864
865 if (conf) {
866 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
867
868 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx);
869 conf = NULL;
870 list_del(&link->assigned_chanctx_list);
871 }
872
873 if (new_ctx) {
874 /* recalc considering the link we'll use it for now */
875 ieee80211_recalc_chanctx_min_def(local, new_ctx, link);
876
877 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
878 if (ret)
879 goto out;
880
881 conf = &new_ctx->conf;
882 list_add(&link->assigned_chanctx_list,
883 &new_ctx->assigned_links);
884 }
885
886 out:
887 rcu_assign_pointer(link->conf->chanctx_conf, conf);
888
889 sdata->vif.cfg.idle = !conf;
890
891 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
892 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
893 ieee80211_recalc_smps_chanctx(local, curr_ctx);
894 ieee80211_recalc_radar_chanctx(local, curr_ctx);
895 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL);
896 }
897
898 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
899 ieee80211_recalc_txpower(sdata, false);
900 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
901 }
902
903 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
904 sdata->vif.type != NL80211_IFTYPE_MONITOR)
905 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE);
906
907 ieee80211_check_fast_xmit_iface(sdata);
908
909 return ret;
910 }
911
ieee80211_recalc_smps_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)912 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
913 struct ieee80211_chanctx *chanctx)
914 {
915 struct ieee80211_sub_if_data *sdata;
916 u8 rx_chains_static, rx_chains_dynamic;
917
918 lockdep_assert_held(&local->chanctx_mtx);
919
920 rx_chains_static = 1;
921 rx_chains_dynamic = 1;
922
923 rcu_read_lock();
924 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
925 u8 needed_static, needed_dynamic;
926 unsigned int link_id;
927
928 if (!ieee80211_sdata_running(sdata))
929 continue;
930
931 switch (sdata->vif.type) {
932 case NL80211_IFTYPE_STATION:
933 if (!sdata->u.mgd.associated)
934 continue;
935 break;
936 case NL80211_IFTYPE_AP:
937 case NL80211_IFTYPE_ADHOC:
938 case NL80211_IFTYPE_MESH_POINT:
939 case NL80211_IFTYPE_OCB:
940 break;
941 default:
942 continue;
943 }
944
945 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
946 struct ieee80211_link_data *link;
947
948 link = rcu_dereference(sdata->link[link_id]);
949
950 if (!link)
951 continue;
952
953 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf)
954 continue;
955
956 switch (link->smps_mode) {
957 default:
958 WARN_ONCE(1, "Invalid SMPS mode %d\n",
959 link->smps_mode);
960 fallthrough;
961 case IEEE80211_SMPS_OFF:
962 needed_static = link->needed_rx_chains;
963 needed_dynamic = link->needed_rx_chains;
964 break;
965 case IEEE80211_SMPS_DYNAMIC:
966 needed_static = 1;
967 needed_dynamic = link->needed_rx_chains;
968 break;
969 case IEEE80211_SMPS_STATIC:
970 needed_static = 1;
971 needed_dynamic = 1;
972 break;
973 }
974
975 rx_chains_static = max(rx_chains_static, needed_static);
976 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
977 }
978 }
979
980 /* Disable SMPS for the monitor interface */
981 sdata = rcu_dereference(local->monitor_sdata);
982 if (sdata &&
983 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
984 rx_chains_dynamic = rx_chains_static = local->rx_chains;
985
986 rcu_read_unlock();
987
988 if (!local->use_chanctx) {
989 if (rx_chains_static > 1)
990 local->smps_mode = IEEE80211_SMPS_OFF;
991 else if (rx_chains_dynamic > 1)
992 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
993 else
994 local->smps_mode = IEEE80211_SMPS_STATIC;
995 ieee80211_hw_config(local, 0);
996 }
997
998 if (rx_chains_static == chanctx->conf.rx_chains_static &&
999 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
1000 return;
1001
1002 chanctx->conf.rx_chains_static = rx_chains_static;
1003 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
1004 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
1005 }
1006
1007 static void
__ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1008 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1009 bool clear)
1010 {
1011 struct ieee80211_sub_if_data *sdata = link->sdata;
1012 unsigned int link_id = link->link_id;
1013 struct ieee80211_bss_conf *link_conf = link->conf;
1014 struct ieee80211_local *local __maybe_unused = sdata->local;
1015 struct ieee80211_sub_if_data *vlan;
1016 struct ieee80211_chanctx_conf *conf;
1017
1018 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
1019 return;
1020
1021 lockdep_assert_held(&local->mtx);
1022
1023 /* Check that conf exists, even when clearing this function
1024 * must be called with the AP's channel context still there
1025 * as it would otherwise cause VLANs to have an invalid
1026 * channel context pointer for a while, possibly pointing
1027 * to a channel context that has already been freed.
1028 */
1029 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1030 lockdep_is_held(&local->chanctx_mtx));
1031 WARN_ON(!conf);
1032
1033 if (clear)
1034 conf = NULL;
1035
1036 rcu_read_lock();
1037 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1038 struct ieee80211_bss_conf *vlan_conf;
1039
1040 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1041 if (WARN_ON(!vlan_conf))
1042 continue;
1043
1044 rcu_assign_pointer(vlan_conf->chanctx_conf, conf);
1045 }
1046 rcu_read_unlock();
1047 }
1048
ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)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 mutex_lock(&local->chanctx_mtx);
1055
1056 __ieee80211_link_copy_chanctx_to_vlans(link, clear);
1057
1058 mutex_unlock(&local->chanctx_mtx);
1059 }
1060
ieee80211_link_unreserve_chanctx(struct ieee80211_link_data * link)1061 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
1062 {
1063 struct ieee80211_sub_if_data *sdata = link->sdata;
1064 struct ieee80211_chanctx *ctx = link->reserved_chanctx;
1065
1066 lockdep_assert_held(&sdata->local->chanctx_mtx);
1067
1068 if (WARN_ON(!ctx))
1069 return -EINVAL;
1070
1071 list_del(&link->reserved_chanctx_list);
1072 link->reserved_chanctx = NULL;
1073
1074 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
1075 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1076 if (WARN_ON(!ctx->replace_ctx))
1077 return -EINVAL;
1078
1079 WARN_ON(ctx->replace_ctx->replace_state !=
1080 IEEE80211_CHANCTX_WILL_BE_REPLACED);
1081 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
1082
1083 ctx->replace_ctx->replace_ctx = NULL;
1084 ctx->replace_ctx->replace_state =
1085 IEEE80211_CHANCTX_REPLACE_NONE;
1086
1087 list_del_rcu(&ctx->list);
1088 kfree_rcu(ctx, rcu_head);
1089 } else {
1090 ieee80211_free_chanctx(sdata->local, ctx);
1091 }
1092 }
1093
1094 return 0;
1095 }
1096
ieee80211_link_reserve_chanctx(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode,bool radar_required)1097 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
1098 const struct cfg80211_chan_def *chandef,
1099 enum ieee80211_chanctx_mode mode,
1100 bool radar_required)
1101 {
1102 struct ieee80211_sub_if_data *sdata = link->sdata;
1103 struct ieee80211_local *local = sdata->local;
1104 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
1105
1106 lockdep_assert_held(&local->chanctx_mtx);
1107
1108 curr_ctx = ieee80211_link_get_chanctx(link);
1109 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
1110 return -ENOTSUPP;
1111
1112 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
1113 if (!new_ctx) {
1114 if (ieee80211_can_create_new_chanctx(local)) {
1115 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
1116 if (IS_ERR(new_ctx))
1117 return PTR_ERR(new_ctx);
1118 } else {
1119 if (!curr_ctx ||
1120 (curr_ctx->replace_state ==
1121 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1122 !list_empty(&curr_ctx->reserved_links)) {
1123 /*
1124 * Another link already requested this context
1125 * for a reservation. Find another one hoping
1126 * all links assigned to it will also switch
1127 * soon enough.
1128 *
1129 * TODO: This needs a little more work as some
1130 * cases (more than 2 chanctx capable devices)
1131 * may fail which could otherwise succeed
1132 * provided some channel context juggling was
1133 * performed.
1134 *
1135 * Consider ctx1..3, link1..6, each ctx has 2
1136 * links. link1 and link2 from ctx1 request new
1137 * different chandefs starting 2 in-place
1138 * reserations with ctx4 and ctx5 replacing
1139 * ctx1 and ctx2 respectively. Next link5 and
1140 * link6 from ctx3 reserve ctx4. If link3 and
1141 * link4 remain on ctx2 as they are then this
1142 * fails unless `replace_ctx` from ctx5 is
1143 * replaced with ctx3.
1144 */
1145 list_for_each_entry(ctx, &local->chanctx_list,
1146 list) {
1147 if (ctx->replace_state !=
1148 IEEE80211_CHANCTX_REPLACE_NONE)
1149 continue;
1150
1151 if (!list_empty(&ctx->reserved_links))
1152 continue;
1153
1154 curr_ctx = ctx;
1155 break;
1156 }
1157 }
1158
1159 /*
1160 * If that's true then all available contexts already
1161 * have reservations and cannot be used.
1162 */
1163 if (!curr_ctx ||
1164 (curr_ctx->replace_state ==
1165 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1166 !list_empty(&curr_ctx->reserved_links))
1167 return -EBUSY;
1168
1169 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1170 if (!new_ctx)
1171 return -ENOMEM;
1172
1173 new_ctx->replace_ctx = curr_ctx;
1174 new_ctx->replace_state =
1175 IEEE80211_CHANCTX_REPLACES_OTHER;
1176
1177 curr_ctx->replace_ctx = new_ctx;
1178 curr_ctx->replace_state =
1179 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1180
1181 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1182 }
1183 }
1184
1185 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
1186 link->reserved_chanctx = new_ctx;
1187 link->reserved_chandef = *chandef;
1188 link->reserved_radar_required = radar_required;
1189 link->reserved_ready = false;
1190
1191 return 0;
1192 }
1193
1194 static void
ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data * link)1195 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link)
1196 {
1197 struct ieee80211_sub_if_data *sdata = link->sdata;
1198
1199 switch (sdata->vif.type) {
1200 case NL80211_IFTYPE_ADHOC:
1201 case NL80211_IFTYPE_AP:
1202 case NL80211_IFTYPE_MESH_POINT:
1203 case NL80211_IFTYPE_OCB:
1204 ieee80211_queue_work(&sdata->local->hw,
1205 &link->csa_finalize_work);
1206 break;
1207 case NL80211_IFTYPE_STATION:
1208 ieee80211_queue_work(&sdata->local->hw,
1209 &link->u.mgd.chswitch_work);
1210 break;
1211 case NL80211_IFTYPE_UNSPECIFIED:
1212 case NL80211_IFTYPE_AP_VLAN:
1213 case NL80211_IFTYPE_WDS:
1214 case NL80211_IFTYPE_MONITOR:
1215 case NL80211_IFTYPE_P2P_CLIENT:
1216 case NL80211_IFTYPE_P2P_GO:
1217 case NL80211_IFTYPE_P2P_DEVICE:
1218 case NL80211_IFTYPE_NAN:
1219 case NUM_NL80211_IFTYPES:
1220 WARN_ON(1);
1221 break;
1222 }
1223 }
1224
1225 static void
ieee80211_link_update_chandef(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef)1226 ieee80211_link_update_chandef(struct ieee80211_link_data *link,
1227 const struct cfg80211_chan_def *chandef)
1228 {
1229 struct ieee80211_sub_if_data *sdata = link->sdata;
1230 unsigned int link_id = link->link_id;
1231 struct ieee80211_sub_if_data *vlan;
1232
1233 link->conf->chandef = *chandef;
1234
1235 if (sdata->vif.type != NL80211_IFTYPE_AP)
1236 return;
1237
1238 rcu_read_lock();
1239 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1240 struct ieee80211_bss_conf *vlan_conf;
1241
1242 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1243 if (WARN_ON(!vlan_conf))
1244 continue;
1245
1246 vlan_conf->chandef = *chandef;
1247 }
1248 rcu_read_unlock();
1249 }
1250
1251 static int
ieee80211_link_use_reserved_reassign(struct ieee80211_link_data * link)1252 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link)
1253 {
1254 struct ieee80211_sub_if_data *sdata = link->sdata;
1255 struct ieee80211_bss_conf *link_conf = link->conf;
1256 struct ieee80211_local *local = sdata->local;
1257 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1258 struct ieee80211_chanctx *old_ctx, *new_ctx;
1259 const struct cfg80211_chan_def *chandef;
1260 u32 changed = 0;
1261 int err;
1262
1263 lockdep_assert_held(&local->mtx);
1264 lockdep_assert_held(&local->chanctx_mtx);
1265
1266 new_ctx = link->reserved_chanctx;
1267 old_ctx = ieee80211_link_get_chanctx(link);
1268
1269 if (WARN_ON(!link->reserved_ready))
1270 return -EBUSY;
1271
1272 if (WARN_ON(!new_ctx))
1273 return -EINVAL;
1274
1275 if (WARN_ON(!old_ctx))
1276 return -EINVAL;
1277
1278 if (WARN_ON(new_ctx->replace_state ==
1279 IEEE80211_CHANCTX_REPLACES_OTHER))
1280 return -EINVAL;
1281
1282 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1283 &link->reserved_chandef);
1284 if (WARN_ON(!chandef))
1285 return -EINVAL;
1286
1287 if (link_conf->chandef.width != link->reserved_chandef.width)
1288 changed = BSS_CHANGED_BANDWIDTH;
1289
1290 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1291
1292 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef, link);
1293
1294 vif_chsw[0].vif = &sdata->vif;
1295 vif_chsw[0].old_ctx = &old_ctx->conf;
1296 vif_chsw[0].new_ctx = &new_ctx->conf;
1297 vif_chsw[0].link_conf = link->conf;
1298
1299 list_del(&link->reserved_chanctx_list);
1300 link->reserved_chanctx = NULL;
1301
1302 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1303 CHANCTX_SWMODE_REASSIGN_VIF);
1304 if (err) {
1305 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1306 ieee80211_free_chanctx(local, new_ctx);
1307
1308 goto out;
1309 }
1310
1311 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links);
1312 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf);
1313
1314 if (sdata->vif.type == NL80211_IFTYPE_AP)
1315 __ieee80211_link_copy_chanctx_to_vlans(link, false);
1316
1317 ieee80211_check_fast_xmit_iface(sdata);
1318
1319 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1320 ieee80211_free_chanctx(local, old_ctx);
1321
1322 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
1323 ieee80211_recalc_smps_chanctx(local, new_ctx);
1324 ieee80211_recalc_radar_chanctx(local, new_ctx);
1325
1326 if (changed)
1327 ieee80211_link_info_change_notify(sdata, link, changed);
1328
1329 out:
1330 ieee80211_link_chanctx_reservation_complete(link);
1331 return err;
1332 }
1333
1334 static int
ieee80211_link_use_reserved_assign(struct ieee80211_link_data * link)1335 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
1336 {
1337 struct ieee80211_sub_if_data *sdata = link->sdata;
1338 struct ieee80211_local *local = sdata->local;
1339 struct ieee80211_chanctx *old_ctx, *new_ctx;
1340 const struct cfg80211_chan_def *chandef;
1341 int err;
1342
1343 old_ctx = ieee80211_link_get_chanctx(link);
1344 new_ctx = link->reserved_chanctx;
1345
1346 if (WARN_ON(!link->reserved_ready))
1347 return -EINVAL;
1348
1349 if (WARN_ON(old_ctx))
1350 return -EINVAL;
1351
1352 if (WARN_ON(!new_ctx))
1353 return -EINVAL;
1354
1355 if (WARN_ON(new_ctx->replace_state ==
1356 IEEE80211_CHANCTX_REPLACES_OTHER))
1357 return -EINVAL;
1358
1359 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1360 &link->reserved_chandef);
1361 if (WARN_ON(!chandef))
1362 return -EINVAL;
1363
1364 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1365
1366 list_del(&link->reserved_chanctx_list);
1367 link->reserved_chanctx = NULL;
1368
1369 err = ieee80211_assign_link_chanctx(link, new_ctx);
1370 if (err) {
1371 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1372 ieee80211_free_chanctx(local, new_ctx);
1373
1374 goto out;
1375 }
1376
1377 out:
1378 ieee80211_link_chanctx_reservation_complete(link);
1379 return err;
1380 }
1381
1382 static bool
ieee80211_link_has_in_place_reservation(struct ieee80211_link_data * link)1383 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link)
1384 {
1385 struct ieee80211_sub_if_data *sdata = link->sdata;
1386 struct ieee80211_chanctx *old_ctx, *new_ctx;
1387
1388 lockdep_assert_held(&sdata->local->chanctx_mtx);
1389
1390 new_ctx = link->reserved_chanctx;
1391 old_ctx = ieee80211_link_get_chanctx(link);
1392
1393 if (!old_ctx)
1394 return false;
1395
1396 if (WARN_ON(!new_ctx))
1397 return false;
1398
1399 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1400 return false;
1401
1402 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1403 return false;
1404
1405 return true;
1406 }
1407
ieee80211_chsw_switch_hwconf(struct ieee80211_local * local,struct ieee80211_chanctx * new_ctx)1408 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1409 struct ieee80211_chanctx *new_ctx)
1410 {
1411 const struct cfg80211_chan_def *chandef;
1412
1413 lockdep_assert_held(&local->mtx);
1414 lockdep_assert_held(&local->chanctx_mtx);
1415
1416 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1417 if (WARN_ON(!chandef))
1418 return -EINVAL;
1419
1420 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1421 local->_oper_chandef = *chandef;
1422 ieee80211_hw_config(local, 0);
1423
1424 return 0;
1425 }
1426
ieee80211_chsw_switch_vifs(struct ieee80211_local * local,int n_vifs)1427 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1428 int n_vifs)
1429 {
1430 struct ieee80211_vif_chanctx_switch *vif_chsw;
1431 struct ieee80211_link_data *link;
1432 struct ieee80211_chanctx *ctx, *old_ctx;
1433 int i, err;
1434
1435 lockdep_assert_held(&local->mtx);
1436 lockdep_assert_held(&local->chanctx_mtx);
1437
1438 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1439 if (!vif_chsw)
1440 return -ENOMEM;
1441
1442 i = 0;
1443 list_for_each_entry(ctx, &local->chanctx_list, list) {
1444 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1445 continue;
1446
1447 if (WARN_ON(!ctx->replace_ctx)) {
1448 err = -EINVAL;
1449 goto out;
1450 }
1451
1452 list_for_each_entry(link, &ctx->reserved_links,
1453 reserved_chanctx_list) {
1454 if (!ieee80211_link_has_in_place_reservation(link))
1455 continue;
1456
1457 old_ctx = ieee80211_link_get_chanctx(link);
1458 vif_chsw[i].vif = &link->sdata->vif;
1459 vif_chsw[i].old_ctx = &old_ctx->conf;
1460 vif_chsw[i].new_ctx = &ctx->conf;
1461 vif_chsw[i].link_conf = link->conf;
1462
1463 i++;
1464 }
1465 }
1466
1467 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1468 CHANCTX_SWMODE_SWAP_CONTEXTS);
1469
1470 out:
1471 kfree(vif_chsw);
1472 return err;
1473 }
1474
ieee80211_chsw_switch_ctxs(struct ieee80211_local * local)1475 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1476 {
1477 struct ieee80211_chanctx *ctx;
1478 int err;
1479
1480 lockdep_assert_held(&local->mtx);
1481 lockdep_assert_held(&local->chanctx_mtx);
1482
1483 list_for_each_entry(ctx, &local->chanctx_list, list) {
1484 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1485 continue;
1486
1487 if (!list_empty(&ctx->replace_ctx->assigned_links))
1488 continue;
1489
1490 ieee80211_del_chanctx(local, ctx->replace_ctx);
1491 err = ieee80211_add_chanctx(local, ctx);
1492 if (err)
1493 goto err;
1494 }
1495
1496 return 0;
1497
1498 err:
1499 WARN_ON(ieee80211_add_chanctx(local, ctx));
1500 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1501 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1502 continue;
1503
1504 if (!list_empty(&ctx->replace_ctx->assigned_links))
1505 continue;
1506
1507 ieee80211_del_chanctx(local, ctx);
1508 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1509 }
1510
1511 return err;
1512 }
1513
ieee80211_vif_use_reserved_switch(struct ieee80211_local * local)1514 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1515 {
1516 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1517 struct ieee80211_chanctx *new_ctx = NULL;
1518 int err, n_assigned, n_reserved, n_ready;
1519 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1520
1521 lockdep_assert_held(&local->mtx);
1522 lockdep_assert_held(&local->chanctx_mtx);
1523
1524 /*
1525 * If there are 2 independent pairs of channel contexts performing
1526 * cross-switch of their vifs this code will still wait until both are
1527 * ready even though it could be possible to switch one before the
1528 * other is ready.
1529 *
1530 * For practical reasons and code simplicity just do a single huge
1531 * switch.
1532 */
1533
1534 /*
1535 * Verify if the reservation is still feasible.
1536 * - if it's not then disconnect
1537 * - if it is but not all vifs necessary are ready then defer
1538 */
1539
1540 list_for_each_entry(ctx, &local->chanctx_list, list) {
1541 struct ieee80211_link_data *link;
1542
1543 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1544 continue;
1545
1546 if (WARN_ON(!ctx->replace_ctx)) {
1547 err = -EINVAL;
1548 goto err;
1549 }
1550
1551 if (!local->use_chanctx)
1552 new_ctx = ctx;
1553
1554 n_ctx++;
1555
1556 n_assigned = 0;
1557 n_reserved = 0;
1558 n_ready = 0;
1559
1560 list_for_each_entry(link, &ctx->replace_ctx->assigned_links,
1561 assigned_chanctx_list) {
1562 n_assigned++;
1563 if (link->reserved_chanctx) {
1564 n_reserved++;
1565 if (link->reserved_ready)
1566 n_ready++;
1567 }
1568 }
1569
1570 if (n_assigned != n_reserved) {
1571 if (n_ready == n_reserved) {
1572 wiphy_info(local->hw.wiphy,
1573 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1574 err = -EBUSY;
1575 goto err;
1576 }
1577
1578 return -EAGAIN;
1579 }
1580
1581 ctx->conf.radar_enabled = false;
1582 list_for_each_entry(link, &ctx->reserved_links,
1583 reserved_chanctx_list) {
1584 if (ieee80211_link_has_in_place_reservation(link) &&
1585 !link->reserved_ready)
1586 return -EAGAIN;
1587
1588 old_ctx = ieee80211_link_get_chanctx(link);
1589 if (old_ctx) {
1590 if (old_ctx->replace_state ==
1591 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1592 n_vifs_switch++;
1593 else
1594 n_vifs_assign++;
1595 } else {
1596 n_vifs_ctxless++;
1597 }
1598
1599 if (link->reserved_radar_required)
1600 ctx->conf.radar_enabled = true;
1601 }
1602 }
1603
1604 if (WARN_ON(n_ctx == 0) ||
1605 WARN_ON(n_vifs_switch == 0 &&
1606 n_vifs_assign == 0 &&
1607 n_vifs_ctxless == 0) ||
1608 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1609 WARN_ON(!new_ctx && !local->use_chanctx)) {
1610 err = -EINVAL;
1611 goto err;
1612 }
1613
1614 /*
1615 * All necessary vifs are ready. Perform the switch now depending on
1616 * reservations and driver capabilities.
1617 */
1618
1619 if (local->use_chanctx) {
1620 if (n_vifs_switch > 0) {
1621 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1622 if (err)
1623 goto err;
1624 }
1625
1626 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1627 err = ieee80211_chsw_switch_ctxs(local);
1628 if (err)
1629 goto err;
1630 }
1631 } else {
1632 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1633 if (err)
1634 goto err;
1635 }
1636
1637 /*
1638 * Update all structures, values and pointers to point to new channel
1639 * context(s).
1640 */
1641 list_for_each_entry(ctx, &local->chanctx_list, list) {
1642 struct ieee80211_link_data *link, *link_tmp;
1643
1644 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1645 continue;
1646
1647 if (WARN_ON(!ctx->replace_ctx)) {
1648 err = -EINVAL;
1649 goto err;
1650 }
1651
1652 list_for_each_entry(link, &ctx->reserved_links,
1653 reserved_chanctx_list) {
1654 struct ieee80211_sub_if_data *sdata = link->sdata;
1655 struct ieee80211_bss_conf *link_conf = link->conf;
1656 u32 changed = 0;
1657
1658 if (!ieee80211_link_has_in_place_reservation(link))
1659 continue;
1660
1661 rcu_assign_pointer(link_conf->chanctx_conf,
1662 &ctx->conf);
1663
1664 if (sdata->vif.type == NL80211_IFTYPE_AP)
1665 __ieee80211_link_copy_chanctx_to_vlans(link,
1666 false);
1667
1668 ieee80211_check_fast_xmit_iface(sdata);
1669
1670 link->radar_required = link->reserved_radar_required;
1671
1672 if (link_conf->chandef.width != link->reserved_chandef.width)
1673 changed = BSS_CHANGED_BANDWIDTH;
1674
1675 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1676 if (changed)
1677 ieee80211_link_info_change_notify(sdata,
1678 link,
1679 changed);
1680
1681 ieee80211_recalc_txpower(sdata, false);
1682 }
1683
1684 ieee80211_recalc_chanctx_chantype(local, ctx);
1685 ieee80211_recalc_smps_chanctx(local, ctx);
1686 ieee80211_recalc_radar_chanctx(local, ctx);
1687 ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
1688
1689 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1690 reserved_chanctx_list) {
1691 if (ieee80211_link_get_chanctx(link) != ctx)
1692 continue;
1693
1694 list_del(&link->reserved_chanctx_list);
1695 list_move(&link->assigned_chanctx_list,
1696 &ctx->assigned_links);
1697 link->reserved_chanctx = NULL;
1698
1699 ieee80211_link_chanctx_reservation_complete(link);
1700 }
1701
1702 /*
1703 * This context might have been a dependency for an already
1704 * ready re-assign reservation interface that was deferred. Do
1705 * not propagate error to the caller though. The in-place
1706 * reservation for originally requested interface has already
1707 * succeeded at this point.
1708 */
1709 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1710 reserved_chanctx_list) {
1711 if (WARN_ON(ieee80211_link_has_in_place_reservation(link)))
1712 continue;
1713
1714 if (WARN_ON(link->reserved_chanctx != ctx))
1715 continue;
1716
1717 if (!link->reserved_ready)
1718 continue;
1719
1720 if (ieee80211_link_get_chanctx(link))
1721 err = ieee80211_link_use_reserved_reassign(link);
1722 else
1723 err = ieee80211_link_use_reserved_assign(link);
1724
1725 if (err) {
1726 link_info(link,
1727 "failed to finalize (re-)assign reservation (err=%d)\n",
1728 err);
1729 ieee80211_link_unreserve_chanctx(link);
1730 cfg80211_stop_iface(local->hw.wiphy,
1731 &link->sdata->wdev,
1732 GFP_KERNEL);
1733 }
1734 }
1735 }
1736
1737 /*
1738 * Finally free old contexts
1739 */
1740
1741 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1742 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1743 continue;
1744
1745 ctx->replace_ctx->replace_ctx = NULL;
1746 ctx->replace_ctx->replace_state =
1747 IEEE80211_CHANCTX_REPLACE_NONE;
1748
1749 list_del_rcu(&ctx->list);
1750 kfree_rcu(ctx, rcu_head);
1751 }
1752
1753 return 0;
1754
1755 err:
1756 list_for_each_entry(ctx, &local->chanctx_list, list) {
1757 struct ieee80211_link_data *link, *link_tmp;
1758
1759 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1760 continue;
1761
1762 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1763 reserved_chanctx_list) {
1764 ieee80211_link_unreserve_chanctx(link);
1765 ieee80211_link_chanctx_reservation_complete(link);
1766 }
1767 }
1768
1769 return err;
1770 }
1771
__ieee80211_link_release_channel(struct ieee80211_link_data * link)1772 static void __ieee80211_link_release_channel(struct ieee80211_link_data *link)
1773 {
1774 struct ieee80211_sub_if_data *sdata = link->sdata;
1775 struct ieee80211_bss_conf *link_conf = link->conf;
1776 struct ieee80211_local *local = sdata->local;
1777 struct ieee80211_chanctx_conf *conf;
1778 struct ieee80211_chanctx *ctx;
1779 bool use_reserved_switch = false;
1780
1781 lockdep_assert_held(&local->chanctx_mtx);
1782
1783 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1784 lockdep_is_held(&local->chanctx_mtx));
1785 if (!conf)
1786 return;
1787
1788 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1789
1790 if (link->reserved_chanctx) {
1791 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
1792 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1)
1793 use_reserved_switch = true;
1794
1795 ieee80211_link_unreserve_chanctx(link);
1796 }
1797
1798 ieee80211_assign_link_chanctx(link, NULL);
1799 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1800 ieee80211_free_chanctx(local, ctx);
1801
1802 link->radar_required = false;
1803
1804 /* Unreserving may ready an in-place reservation. */
1805 if (use_reserved_switch)
1806 ieee80211_vif_use_reserved_switch(local);
1807 }
1808
ieee80211_link_use_channel(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)1809 int ieee80211_link_use_channel(struct ieee80211_link_data *link,
1810 const struct cfg80211_chan_def *chandef,
1811 enum ieee80211_chanctx_mode mode)
1812 {
1813 struct ieee80211_sub_if_data *sdata = link->sdata;
1814 struct ieee80211_local *local = sdata->local;
1815 struct ieee80211_chanctx *ctx;
1816 u8 radar_detect_width = 0;
1817 int ret;
1818
1819 lockdep_assert_held(&local->mtx);
1820
1821 if (sdata->vif.active_links &&
1822 !(sdata->vif.active_links & BIT(link->link_id))) {
1823 ieee80211_link_update_chandef(link, chandef);
1824 return 0;
1825 }
1826
1827 mutex_lock(&local->chanctx_mtx);
1828
1829 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1830 chandef,
1831 sdata->wdev.iftype);
1832 if (ret < 0)
1833 goto out;
1834 if (ret > 0)
1835 radar_detect_width = BIT(chandef->width);
1836
1837 link->radar_required = ret;
1838
1839 ret = ieee80211_check_combinations(sdata, chandef, mode,
1840 radar_detect_width);
1841 if (ret < 0)
1842 goto out;
1843
1844 __ieee80211_link_release_channel(link);
1845
1846 ctx = ieee80211_find_chanctx(local, chandef, mode);
1847 if (!ctx)
1848 ctx = ieee80211_new_chanctx(local, chandef, mode);
1849 if (IS_ERR(ctx)) {
1850 ret = PTR_ERR(ctx);
1851 goto out;
1852 }
1853
1854 ieee80211_link_update_chandef(link, chandef);
1855
1856 ret = ieee80211_assign_link_chanctx(link, ctx);
1857 if (ret) {
1858 /* if assign fails refcount stays the same */
1859 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1860 ieee80211_free_chanctx(local, ctx);
1861 goto out;
1862 }
1863
1864 ieee80211_recalc_smps_chanctx(local, ctx);
1865 ieee80211_recalc_radar_chanctx(local, ctx);
1866 out:
1867 if (ret)
1868 link->radar_required = false;
1869
1870 mutex_unlock(&local->chanctx_mtx);
1871 return ret;
1872 }
1873
ieee80211_link_use_reserved_context(struct ieee80211_link_data * link)1874 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
1875 {
1876 struct ieee80211_sub_if_data *sdata = link->sdata;
1877 struct ieee80211_local *local = sdata->local;
1878 struct ieee80211_chanctx *new_ctx;
1879 struct ieee80211_chanctx *old_ctx;
1880 int err;
1881
1882 lockdep_assert_held(&local->mtx);
1883 lockdep_assert_held(&local->chanctx_mtx);
1884
1885 new_ctx = link->reserved_chanctx;
1886 old_ctx = ieee80211_link_get_chanctx(link);
1887
1888 if (WARN_ON(!new_ctx))
1889 return -EINVAL;
1890
1891 if (WARN_ON(new_ctx->replace_state ==
1892 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1893 return -EINVAL;
1894
1895 if (WARN_ON(link->reserved_ready))
1896 return -EINVAL;
1897
1898 link->reserved_ready = true;
1899
1900 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1901 if (old_ctx)
1902 return ieee80211_link_use_reserved_reassign(link);
1903
1904 return ieee80211_link_use_reserved_assign(link);
1905 }
1906
1907 /*
1908 * In-place reservation may need to be finalized now either if:
1909 * a) sdata is taking part in the swapping itself and is the last one
1910 * b) sdata has switched with a re-assign reservation to an existing
1911 * context readying in-place switching of old_ctx
1912 *
1913 * In case of (b) do not propagate the error up because the requested
1914 * sdata already switched successfully. Just spill an extra warning.
1915 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1916 * interfaces upon failure.
1917 */
1918 if ((old_ctx &&
1919 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1920 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1921 err = ieee80211_vif_use_reserved_switch(local);
1922 if (err && err != -EAGAIN) {
1923 if (new_ctx->replace_state ==
1924 IEEE80211_CHANCTX_REPLACES_OTHER)
1925 return err;
1926
1927 wiphy_info(local->hw.wiphy,
1928 "depending in-place reservation failed (err=%d)\n",
1929 err);
1930 }
1931 }
1932
1933 return 0;
1934 }
1935
ieee80211_link_change_bandwidth(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,u32 * changed)1936 int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
1937 const struct cfg80211_chan_def *chandef,
1938 u32 *changed)
1939 {
1940 struct ieee80211_sub_if_data *sdata = link->sdata;
1941 struct ieee80211_bss_conf *link_conf = link->conf;
1942 struct ieee80211_local *local = sdata->local;
1943 struct ieee80211_chanctx_conf *conf;
1944 struct ieee80211_chanctx *ctx;
1945 const struct cfg80211_chan_def *compat;
1946 int ret;
1947
1948 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1949 IEEE80211_CHAN_DISABLED))
1950 return -EINVAL;
1951
1952 mutex_lock(&local->chanctx_mtx);
1953 if (cfg80211_chandef_identical(chandef, &link_conf->chandef)) {
1954 ret = 0;
1955 goto out;
1956 }
1957
1958 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1959 link_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1960 ret = -EINVAL;
1961 goto out;
1962 }
1963
1964 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1965 lockdep_is_held(&local->chanctx_mtx));
1966 if (!conf) {
1967 ret = -EINVAL;
1968 goto out;
1969 }
1970
1971 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1972
1973 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1974 if (!compat) {
1975 ret = -EINVAL;
1976 goto out;
1977 }
1978
1979 switch (ctx->replace_state) {
1980 case IEEE80211_CHANCTX_REPLACE_NONE:
1981 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1982 ret = -EBUSY;
1983 goto out;
1984 }
1985 break;
1986 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1987 /* TODO: Perhaps the bandwidth change could be treated as a
1988 * reservation itself? */
1989 ret = -EBUSY;
1990 goto out;
1991 case IEEE80211_CHANCTX_REPLACES_OTHER:
1992 /* channel context that is going to replace another channel
1993 * context doesn't really exist and shouldn't be assigned
1994 * anywhere yet */
1995 WARN_ON(1);
1996 break;
1997 }
1998
1999 ieee80211_link_update_chandef(link, chandef);
2000
2001 ieee80211_recalc_chanctx_chantype(local, ctx);
2002
2003 *changed |= BSS_CHANGED_BANDWIDTH;
2004 ret = 0;
2005 out:
2006 mutex_unlock(&local->chanctx_mtx);
2007 return ret;
2008 }
2009
ieee80211_link_release_channel(struct ieee80211_link_data * link)2010 void ieee80211_link_release_channel(struct ieee80211_link_data *link)
2011 {
2012 struct ieee80211_sub_if_data *sdata = link->sdata;
2013
2014 mutex_lock(&sdata->local->chanctx_mtx);
2015 if (rcu_access_pointer(link->conf->chanctx_conf)) {
2016 lockdep_assert_held(&sdata->local->mtx);
2017 __ieee80211_link_release_channel(link);
2018 }
2019 mutex_unlock(&sdata->local->chanctx_mtx);
2020 }
2021
ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data * link)2022 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link)
2023 {
2024 struct ieee80211_sub_if_data *sdata = link->sdata;
2025 unsigned int link_id = link->link_id;
2026 struct ieee80211_bss_conf *link_conf = link->conf;
2027 struct ieee80211_bss_conf *ap_conf;
2028 struct ieee80211_local *local = sdata->local;
2029 struct ieee80211_sub_if_data *ap;
2030 struct ieee80211_chanctx_conf *conf;
2031
2032 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
2033 return;
2034
2035 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
2036
2037 mutex_lock(&local->chanctx_mtx);
2038
2039 rcu_read_lock();
2040 ap_conf = rcu_dereference(ap->vif.link_conf[link_id]);
2041 conf = rcu_dereference_protected(ap_conf->chanctx_conf,
2042 lockdep_is_held(&local->chanctx_mtx));
2043 rcu_assign_pointer(link_conf->chanctx_conf, conf);
2044 rcu_read_unlock();
2045 mutex_unlock(&local->chanctx_mtx);
2046 }
2047
ieee80211_iter_chan_contexts_atomic(struct ieee80211_hw * hw,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_chanctx_conf * chanctx_conf,void * data),void * iter_data)2048 void ieee80211_iter_chan_contexts_atomic(
2049 struct ieee80211_hw *hw,
2050 void (*iter)(struct ieee80211_hw *hw,
2051 struct ieee80211_chanctx_conf *chanctx_conf,
2052 void *data),
2053 void *iter_data)
2054 {
2055 struct ieee80211_local *local = hw_to_local(hw);
2056 struct ieee80211_chanctx *ctx;
2057
2058 rcu_read_lock();
2059 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
2060 if (ctx->driver_present)
2061 iter(hw, &ctx->conf, iter_data);
2062 rcu_read_unlock();
2063 }
2064 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
2065