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_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
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_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
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_wiphy(local->hw.wiphy);
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_wiphy(local->hw.wiphy);
66
67 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
68 }
69
70 static struct ieee80211_chanctx *
ieee80211_link_get_chanctx(struct ieee80211_link_data * link)71 ieee80211_link_get_chanctx(struct ieee80211_link_data *link)
72 {
73 struct ieee80211_local *local __maybe_unused = link->sdata->local;
74 struct ieee80211_chanctx_conf *conf;
75
76 conf = rcu_dereference_protected(link->conf->chanctx_conf,
77 lockdep_is_held(&local->hw.wiphy->mtx));
78 if (!conf)
79 return NULL;
80
81 return container_of(conf, struct ieee80211_chanctx, conf);
82 }
83
84 static const struct cfg80211_chan_def *
ieee80211_chanctx_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)85 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
86 struct ieee80211_chanctx *ctx,
87 const struct cfg80211_chan_def *compat)
88 {
89 struct ieee80211_link_data *link;
90
91 lockdep_assert_wiphy(local->hw.wiphy);
92
93 list_for_each_entry(link, &ctx->reserved_links,
94 reserved_chanctx_list) {
95 if (!compat)
96 compat = &link->reserved_chandef;
97
98 compat = cfg80211_chandef_compatible(&link->reserved_chandef,
99 compat);
100 if (!compat)
101 break;
102 }
103
104 return compat;
105 }
106
107 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)108 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
109 struct ieee80211_chanctx *ctx,
110 const struct cfg80211_chan_def *compat)
111 {
112 struct ieee80211_link_data *link;
113
114 lockdep_assert_wiphy(local->hw.wiphy);
115
116 list_for_each_entry(link, &ctx->assigned_links,
117 assigned_chanctx_list) {
118 struct ieee80211_bss_conf *link_conf = link->conf;
119
120 if (link->reserved_chanctx)
121 continue;
122
123 if (!compat)
124 compat = &link_conf->chandef;
125
126 compat = cfg80211_chandef_compatible(
127 &link_conf->chandef, compat);
128 if (!compat)
129 break;
130 }
131
132 return compat;
133 }
134
135 static const struct cfg80211_chan_def *
ieee80211_chanctx_combined_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)136 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
137 struct ieee80211_chanctx *ctx,
138 const struct cfg80211_chan_def *compat)
139 {
140 lockdep_assert_wiphy(local->hw.wiphy);
141
142 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
143 if (!compat)
144 return NULL;
145
146 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
147 if (!compat)
148 return NULL;
149
150 return compat;
151 }
152
153 static bool
ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * def)154 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
155 struct ieee80211_chanctx *ctx,
156 const struct cfg80211_chan_def *def)
157 {
158 lockdep_assert_wiphy(local->hw.wiphy);
159
160 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
161 return true;
162
163 if (!list_empty(&ctx->reserved_links) &&
164 ieee80211_chanctx_reserved_chandef(local, ctx, def))
165 return true;
166
167 return false;
168 }
169
170 static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)171 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
172 const struct cfg80211_chan_def *chandef,
173 enum ieee80211_chanctx_mode mode)
174 {
175 struct ieee80211_chanctx *ctx;
176
177 lockdep_assert_wiphy(local->hw.wiphy);
178
179 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
180 return NULL;
181
182 list_for_each_entry(ctx, &local->chanctx_list, list) {
183 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
184 continue;
185
186 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
187 continue;
188
189 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
190 chandef))
191 continue;
192
193 return ctx;
194 }
195
196 return NULL;
197 }
198
ieee80211_get_sta_bw(struct sta_info * sta,unsigned int link_id)199 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta,
200 unsigned int link_id)
201 {
202 enum ieee80211_sta_rx_bandwidth width;
203 struct link_sta_info *link_sta;
204
205 link_sta = rcu_dereference(sta->link[link_id]);
206
207 /* no effect if this STA has no presence on this link */
208 if (!link_sta)
209 return NL80211_CHAN_WIDTH_20_NOHT;
210
211 width = ieee80211_sta_cap_rx_bw(link_sta);
212
213 switch (width) {
214 case IEEE80211_STA_RX_BW_20:
215 if (link_sta->pub->ht_cap.ht_supported)
216 return NL80211_CHAN_WIDTH_20;
217 else
218 return NL80211_CHAN_WIDTH_20_NOHT;
219 case IEEE80211_STA_RX_BW_40:
220 return NL80211_CHAN_WIDTH_40;
221 case IEEE80211_STA_RX_BW_80:
222 return NL80211_CHAN_WIDTH_80;
223 case IEEE80211_STA_RX_BW_160:
224 /*
225 * This applied for both 160 and 80+80. since we use
226 * the returned value to consider degradation of
227 * ctx->conf.min_def, we have to make sure to take
228 * the bigger one (NL80211_CHAN_WIDTH_160).
229 * Otherwise we might try degrading even when not
230 * needed, as the max required sta_bw returned (80+80)
231 * might be smaller than the configured bw (160).
232 */
233 return NL80211_CHAN_WIDTH_160;
234 case IEEE80211_STA_RX_BW_320:
235 return NL80211_CHAN_WIDTH_320;
236 default:
237 WARN_ON(1);
238 return NL80211_CHAN_WIDTH_20;
239 }
240 }
241
242 static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_sub_if_data * sdata,unsigned int link_id)243 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata,
244 unsigned int link_id)
245 {
246 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
247 struct sta_info *sta;
248
249 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
250 if (sdata != sta->sdata &&
251 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
252 continue;
253
254 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id));
255 }
256
257 return max_bw;
258 }
259
260 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)261 ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data *sdata,
262 struct ieee80211_chanctx *ctx,
263 struct ieee80211_link_data *rsvd_for)
264 {
265 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
266 struct ieee80211_vif *vif = &sdata->vif;
267 int link_id;
268
269 rcu_read_lock();
270 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
271 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
272 struct ieee80211_link_data *link =
273 rcu_dereference(sdata->link[link_id]);
274
275 if (!link)
276 continue;
277
278 if (link != rsvd_for &&
279 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf)
280 continue;
281
282 switch (vif->type) {
283 case NL80211_IFTYPE_AP:
284 case NL80211_IFTYPE_AP_VLAN:
285 width = ieee80211_get_max_required_bw(sdata, link_id);
286 break;
287 case NL80211_IFTYPE_STATION:
288 /*
289 * The ap's sta->bandwidth is not set yet at this
290 * point, so take the width from the chandef, but
291 * account also for TDLS peers
292 */
293 width = max(link->conf->chandef.width,
294 ieee80211_get_max_required_bw(sdata, link_id));
295 break;
296 case NL80211_IFTYPE_P2P_DEVICE:
297 case NL80211_IFTYPE_NAN:
298 continue;
299 case NL80211_IFTYPE_ADHOC:
300 case NL80211_IFTYPE_MESH_POINT:
301 case NL80211_IFTYPE_OCB:
302 width = link->conf->chandef.width;
303 break;
304 case NL80211_IFTYPE_WDS:
305 case NL80211_IFTYPE_UNSPECIFIED:
306 case NUM_NL80211_IFTYPES:
307 case NL80211_IFTYPE_MONITOR:
308 case NL80211_IFTYPE_P2P_CLIENT:
309 case NL80211_IFTYPE_P2P_GO:
310 WARN_ON_ONCE(1);
311 }
312
313 max_bw = max(max_bw, width);
314 }
315 rcu_read_unlock();
316
317 return max_bw;
318 }
319
320 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)321 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
322 struct ieee80211_chanctx *ctx,
323 struct ieee80211_link_data *rsvd_for)
324 {
325 struct ieee80211_sub_if_data *sdata;
326 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
327
328 rcu_read_lock();
329 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
330 enum nl80211_chan_width width;
331
332 if (!ieee80211_sdata_running(sdata))
333 continue;
334
335 width = ieee80211_get_chanctx_vif_max_required_bw(sdata, ctx,
336 rsvd_for);
337
338 max_bw = max(max_bw, width);
339 }
340
341 /* use the configured bandwidth in case of monitor interface */
342 sdata = rcu_dereference(local->monitor_sdata);
343 if (sdata &&
344 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf)
345 max_bw = max(max_bw, ctx->conf.def.width);
346
347 rcu_read_unlock();
348
349 return max_bw;
350 }
351
352 /*
353 * recalc the min required chan width of the channel context, which is
354 * the max of min required widths of all the interfaces bound to this
355 * channel context.
356 */
357 static u32
_ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)358 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
359 struct ieee80211_chanctx *ctx,
360 struct ieee80211_link_data *rsvd_for)
361 {
362 enum nl80211_chan_width max_bw;
363 struct cfg80211_chan_def min_def;
364
365 lockdep_assert_wiphy(local->hw.wiphy);
366
367 /* don't optimize non-20MHz based and radar_enabled confs */
368 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
369 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
370 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
371 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
372 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
373 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
374 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
375 ctx->conf.radar_enabled) {
376 ctx->conf.min_def = ctx->conf.def;
377 return 0;
378 }
379
380 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for);
381
382 /* downgrade chandef up to max_bw */
383 min_def = ctx->conf.def;
384 while (min_def.width > max_bw)
385 ieee80211_chandef_downgrade(&min_def);
386
387 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
388 return 0;
389
390 ctx->conf.min_def = min_def;
391 if (!ctx->driver_present)
392 return 0;
393
394 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
395 }
396
397 /* calling this function is assuming that station vif is updated to
398 * lates changes by calling ieee80211_link_update_chandef
399 */
ieee80211_chan_bw_change(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool narrowed)400 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
401 struct ieee80211_chanctx *ctx,
402 bool narrowed)
403 {
404 struct sta_info *sta;
405 struct ieee80211_supported_band *sband =
406 local->hw.wiphy->bands[ctx->conf.def.chan->band];
407
408 rcu_read_lock();
409 list_for_each_entry_rcu(sta, &local->sta_list,
410 list) {
411 struct ieee80211_sub_if_data *sdata = sta->sdata;
412 enum ieee80211_sta_rx_bandwidth new_sta_bw;
413 unsigned int link_id;
414
415 if (!ieee80211_sdata_running(sta->sdata))
416 continue;
417
418 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
419 struct ieee80211_bss_conf *link_conf =
420 rcu_dereference(sdata->vif.link_conf[link_id]);
421 struct link_sta_info *link_sta;
422
423 if (!link_conf)
424 continue;
425
426 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf)
427 continue;
428
429 link_sta = rcu_dereference(sta->link[link_id]);
430 if (!link_sta)
431 continue;
432
433 new_sta_bw = ieee80211_sta_cur_vht_bw(link_sta);
434
435 /* nothing change */
436 if (new_sta_bw == link_sta->pub->bandwidth)
437 continue;
438
439 /* vif changed to narrow BW and narrow BW for station wasn't
440 * requested or vise versa */
441 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed)
442 continue;
443
444 link_sta->pub->bandwidth = new_sta_bw;
445 rate_control_rate_update(local, sband, sta, link_id,
446 IEEE80211_RC_BW_CHANGED);
447 }
448 }
449 rcu_read_unlock();
450 }
451
452 /*
453 * recalc the min required chan width of the channel context, which is
454 * the max of min required widths of all the interfaces bound to this
455 * channel context.
456 */
ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for)457 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
458 struct ieee80211_chanctx *ctx,
459 struct ieee80211_link_data *rsvd_for)
460 {
461 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
462
463 if (!changed)
464 return;
465
466 /* check is BW narrowed */
467 ieee80211_chan_bw_change(local, ctx, true);
468
469 drv_change_chanctx(local, ctx, changed);
470
471 /* check is BW wider */
472 ieee80211_chan_bw_change(local, ctx, false);
473 }
474
_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)475 static void _ieee80211_change_chanctx(struct ieee80211_local *local,
476 struct ieee80211_chanctx *ctx,
477 struct ieee80211_chanctx *old_ctx,
478 const struct cfg80211_chan_def *chandef,
479 struct ieee80211_link_data *rsvd_for)
480 {
481 u32 changed;
482
483 /* expected to handle only 20/40/80/160/320 channel widths */
484 switch (chandef->width) {
485 case NL80211_CHAN_WIDTH_20_NOHT:
486 case NL80211_CHAN_WIDTH_20:
487 case NL80211_CHAN_WIDTH_40:
488 case NL80211_CHAN_WIDTH_80:
489 case NL80211_CHAN_WIDTH_80P80:
490 case NL80211_CHAN_WIDTH_160:
491 case NL80211_CHAN_WIDTH_320:
492 break;
493 default:
494 WARN_ON(1);
495 }
496
497 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
498 * due to maybe not returning from it, e.g in case new context was added
499 * first time with all parameters up to date.
500 */
501 ieee80211_chan_bw_change(local, old_ctx, true);
502
503 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
504 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
505 return;
506 }
507
508 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
509
510 ieee80211_remove_wbrf(local, &ctx->conf.def);
511
512 ctx->conf.def = *chandef;
513
514 /* check if min chanctx also changed */
515 changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
516 _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for);
517
518 ieee80211_add_wbrf(local, &ctx->conf.def);
519
520 drv_change_chanctx(local, ctx, changed);
521
522 if (!local->use_chanctx) {
523 local->_oper_chandef = *chandef;
524 ieee80211_hw_config(local, 0);
525 }
526
527 /* check is BW wider */
528 ieee80211_chan_bw_change(local, old_ctx, false);
529 }
530
ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct cfg80211_chan_def * chandef)531 static void ieee80211_change_chanctx(struct ieee80211_local *local,
532 struct ieee80211_chanctx *ctx,
533 struct ieee80211_chanctx *old_ctx,
534 const struct cfg80211_chan_def *chandef)
535 {
536 _ieee80211_change_chanctx(local, ctx, old_ctx, chandef, NULL);
537 }
538
539 static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)540 ieee80211_find_chanctx(struct ieee80211_local *local,
541 const struct cfg80211_chan_def *chandef,
542 enum ieee80211_chanctx_mode mode)
543 {
544 struct ieee80211_chanctx *ctx;
545
546 lockdep_assert_wiphy(local->hw.wiphy);
547
548 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
549 return NULL;
550
551 list_for_each_entry(ctx, &local->chanctx_list, list) {
552 const struct cfg80211_chan_def *compat;
553
554 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
555 continue;
556
557 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
558 continue;
559
560 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
561 if (!compat)
562 continue;
563
564 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
565 compat);
566 if (!compat)
567 continue;
568
569 ieee80211_change_chanctx(local, ctx, ctx, compat);
570
571 return ctx;
572 }
573
574 return NULL;
575 }
576
ieee80211_is_radar_required(struct ieee80211_local * local)577 bool ieee80211_is_radar_required(struct ieee80211_local *local)
578 {
579 struct ieee80211_sub_if_data *sdata;
580
581 lockdep_assert_wiphy(local->hw.wiphy);
582
583 rcu_read_lock();
584 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
585 unsigned int link_id;
586
587 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
588 struct ieee80211_link_data *link;
589
590 link = rcu_dereference(sdata->link[link_id]);
591
592 if (link && link->radar_required) {
593 rcu_read_unlock();
594 return true;
595 }
596 }
597 }
598 rcu_read_unlock();
599
600 return false;
601 }
602
603 static bool
ieee80211_chanctx_radar_required(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)604 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
605 struct ieee80211_chanctx *ctx)
606 {
607 struct ieee80211_chanctx_conf *conf = &ctx->conf;
608 struct ieee80211_sub_if_data *sdata;
609 bool required = false;
610
611 lockdep_assert_wiphy(local->hw.wiphy);
612
613 rcu_read_lock();
614 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
615 unsigned int link_id;
616
617 if (!ieee80211_sdata_running(sdata))
618 continue;
619 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
620 struct ieee80211_link_data *link;
621
622 link = rcu_dereference(sdata->link[link_id]);
623 if (!link)
624 continue;
625
626 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
627 continue;
628 if (!link->radar_required)
629 continue;
630 required = true;
631 break;
632 }
633
634 if (required)
635 break;
636 }
637 rcu_read_unlock();
638
639 return required;
640 }
641
642 static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)643 ieee80211_alloc_chanctx(struct ieee80211_local *local,
644 const struct cfg80211_chan_def *chandef,
645 enum ieee80211_chanctx_mode mode)
646 {
647 struct ieee80211_chanctx *ctx;
648
649 lockdep_assert_wiphy(local->hw.wiphy);
650
651 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
652 if (!ctx)
653 return NULL;
654
655 INIT_LIST_HEAD(&ctx->assigned_links);
656 INIT_LIST_HEAD(&ctx->reserved_links);
657 ctx->conf.def = *chandef;
658 ctx->conf.rx_chains_static = 1;
659 ctx->conf.rx_chains_dynamic = 1;
660 ctx->mode = mode;
661 ctx->conf.radar_enabled = false;
662 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
663
664 return ctx;
665 }
666
ieee80211_add_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)667 static int ieee80211_add_chanctx(struct ieee80211_local *local,
668 struct ieee80211_chanctx *ctx)
669 {
670 u32 changed;
671 int err;
672
673 lockdep_assert_wiphy(local->hw.wiphy);
674
675 ieee80211_add_wbrf(local, &ctx->conf.def);
676
677 if (!local->use_chanctx)
678 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
679
680 /* turn idle off *before* setting channel -- some drivers need that */
681 changed = ieee80211_idle_off(local);
682 if (changed)
683 ieee80211_hw_config(local, changed);
684
685 if (!local->use_chanctx) {
686 local->_oper_chandef = ctx->conf.def;
687 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
688 } else {
689 err = drv_add_chanctx(local, ctx);
690 if (err) {
691 ieee80211_recalc_idle(local);
692 return err;
693 }
694 }
695
696 return 0;
697 }
698
699 static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)700 ieee80211_new_chanctx(struct ieee80211_local *local,
701 const struct cfg80211_chan_def *chandef,
702 enum ieee80211_chanctx_mode mode)
703 {
704 struct ieee80211_chanctx *ctx;
705 int err;
706
707 lockdep_assert_wiphy(local->hw.wiphy);
708
709 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
710 if (!ctx)
711 return ERR_PTR(-ENOMEM);
712
713 err = ieee80211_add_chanctx(local, ctx);
714 if (err) {
715 kfree(ctx);
716 return ERR_PTR(err);
717 }
718
719 list_add_rcu(&ctx->list, &local->chanctx_list);
720 return ctx;
721 }
722
ieee80211_del_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)723 static void ieee80211_del_chanctx(struct ieee80211_local *local,
724 struct ieee80211_chanctx *ctx)
725 {
726 lockdep_assert_wiphy(local->hw.wiphy);
727
728 if (!local->use_chanctx) {
729 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
730 /* S1G doesn't have 20MHz, so get the correct width for the
731 * current channel.
732 */
733 if (chandef->chan->band == NL80211_BAND_S1GHZ)
734 chandef->width =
735 ieee80211_s1g_channel_width(chandef->chan);
736 else
737 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
738 chandef->center_freq1 = chandef->chan->center_freq;
739 chandef->freq1_offset = chandef->chan->freq_offset;
740 chandef->center_freq2 = 0;
741
742 /* NOTE: Disabling radar is only valid here for
743 * single channel context. To be sure, check it ...
744 */
745 WARN_ON(local->hw.conf.radar_enabled &&
746 !list_empty(&local->chanctx_list));
747
748 local->hw.conf.radar_enabled = false;
749
750 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
751 } else {
752 drv_remove_chanctx(local, ctx);
753 }
754
755 ieee80211_recalc_idle(local);
756
757 ieee80211_remove_wbrf(local, &ctx->conf.def);
758 }
759
ieee80211_free_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)760 static void ieee80211_free_chanctx(struct ieee80211_local *local,
761 struct ieee80211_chanctx *ctx)
762 {
763 lockdep_assert_wiphy(local->hw.wiphy);
764
765 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
766
767 list_del_rcu(&ctx->list);
768 ieee80211_del_chanctx(local, ctx);
769 kfree_rcu(ctx, rcu_head);
770 }
771
ieee80211_recalc_chanctx_chantype(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)772 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
773 struct ieee80211_chanctx *ctx)
774 {
775 struct ieee80211_chanctx_conf *conf = &ctx->conf;
776 struct ieee80211_sub_if_data *sdata;
777 const struct cfg80211_chan_def *compat = NULL;
778 struct sta_info *sta;
779
780 lockdep_assert_wiphy(local->hw.wiphy);
781
782 rcu_read_lock();
783 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
784 int link_id;
785
786 if (!ieee80211_sdata_running(sdata))
787 continue;
788
789 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
790 continue;
791
792 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
793 struct ieee80211_bss_conf *link_conf =
794 rcu_dereference(sdata->vif.link_conf[link_id]);
795
796 if (!link_conf)
797 continue;
798
799 if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
800 continue;
801
802 if (!compat)
803 compat = &link_conf->chandef;
804
805 compat = cfg80211_chandef_compatible(&link_conf->chandef,
806 compat);
807 if (WARN_ON_ONCE(!compat))
808 break;
809 }
810 }
811
812 if (WARN_ON_ONCE(!compat)) {
813 rcu_read_unlock();
814 return;
815 }
816
817 /* TDLS peers can sometimes affect the chandef width */
818 list_for_each_entry_rcu(sta, &local->sta_list, list) {
819 if (!sta->uploaded ||
820 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
821 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
822 !sta->tdls_chandef.chan)
823 continue;
824
825 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
826 compat);
827 if (WARN_ON_ONCE(!compat))
828 break;
829 }
830 rcu_read_unlock();
831
832 if (!compat)
833 return;
834
835 ieee80211_change_chanctx(local, ctx, ctx, compat);
836 }
837
ieee80211_recalc_radar_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)838 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
839 struct ieee80211_chanctx *chanctx)
840 {
841 bool radar_enabled;
842
843 lockdep_assert_wiphy(local->hw.wiphy);
844
845 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
846
847 if (radar_enabled == chanctx->conf.radar_enabled)
848 return;
849
850 chanctx->conf.radar_enabled = radar_enabled;
851
852 if (!local->use_chanctx) {
853 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
854 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
855 }
856
857 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
858 }
859
ieee80211_assign_link_chanctx(struct ieee80211_link_data * link,struct ieee80211_chanctx * new_ctx)860 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
861 struct ieee80211_chanctx *new_ctx)
862 {
863 struct ieee80211_sub_if_data *sdata = link->sdata;
864 struct ieee80211_local *local = sdata->local;
865 struct ieee80211_chanctx_conf *conf;
866 struct ieee80211_chanctx *curr_ctx = NULL;
867 int ret = 0;
868
869 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
870 return -EOPNOTSUPP;
871
872 conf = rcu_dereference_protected(link->conf->chanctx_conf,
873 lockdep_is_held(&local->hw.wiphy->mtx));
874
875 if (conf) {
876 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
877
878 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx);
879 conf = NULL;
880 list_del(&link->assigned_chanctx_list);
881 }
882
883 if (new_ctx) {
884 /* recalc considering the link we'll use it for now */
885 ieee80211_recalc_chanctx_min_def(local, new_ctx, link);
886
887 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
888 if (ret)
889 goto out;
890
891 conf = &new_ctx->conf;
892 list_add(&link->assigned_chanctx_list,
893 &new_ctx->assigned_links);
894 }
895
896 out:
897 rcu_assign_pointer(link->conf->chanctx_conf, conf);
898
899 sdata->vif.cfg.idle = !conf;
900
901 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
902 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
903 ieee80211_recalc_smps_chanctx(local, curr_ctx);
904 ieee80211_recalc_radar_chanctx(local, curr_ctx);
905 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL);
906 }
907
908 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
909 ieee80211_recalc_txpower(sdata, false);
910 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
911 }
912
913 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
914 sdata->vif.type != NL80211_IFTYPE_MONITOR)
915 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE);
916
917 ieee80211_check_fast_xmit_iface(sdata);
918
919 return ret;
920 }
921
ieee80211_recalc_smps_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)922 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
923 struct ieee80211_chanctx *chanctx)
924 {
925 struct ieee80211_sub_if_data *sdata;
926 u8 rx_chains_static, rx_chains_dynamic;
927
928 lockdep_assert_wiphy(local->hw.wiphy);
929
930 rx_chains_static = 1;
931 rx_chains_dynamic = 1;
932
933 rcu_read_lock();
934 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
935 u8 needed_static, needed_dynamic;
936 unsigned int link_id;
937
938 if (!ieee80211_sdata_running(sdata))
939 continue;
940
941 switch (sdata->vif.type) {
942 case NL80211_IFTYPE_STATION:
943 if (!sdata->u.mgd.associated)
944 continue;
945 break;
946 case NL80211_IFTYPE_AP:
947 case NL80211_IFTYPE_ADHOC:
948 case NL80211_IFTYPE_MESH_POINT:
949 case NL80211_IFTYPE_OCB:
950 break;
951 default:
952 continue;
953 }
954
955 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
956 struct ieee80211_link_data *link;
957
958 link = rcu_dereference(sdata->link[link_id]);
959
960 if (!link)
961 continue;
962
963 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf)
964 continue;
965
966 switch (link->smps_mode) {
967 default:
968 WARN_ONCE(1, "Invalid SMPS mode %d\n",
969 link->smps_mode);
970 fallthrough;
971 case IEEE80211_SMPS_OFF:
972 needed_static = link->needed_rx_chains;
973 needed_dynamic = link->needed_rx_chains;
974 break;
975 case IEEE80211_SMPS_DYNAMIC:
976 needed_static = 1;
977 needed_dynamic = link->needed_rx_chains;
978 break;
979 case IEEE80211_SMPS_STATIC:
980 needed_static = 1;
981 needed_dynamic = 1;
982 break;
983 }
984
985 rx_chains_static = max(rx_chains_static, needed_static);
986 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
987 }
988 }
989
990 /* Disable SMPS for the monitor interface */
991 sdata = rcu_dereference(local->monitor_sdata);
992 if (sdata &&
993 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
994 rx_chains_dynamic = rx_chains_static = local->rx_chains;
995
996 rcu_read_unlock();
997
998 if (!local->use_chanctx) {
999 if (rx_chains_static > 1)
1000 local->smps_mode = IEEE80211_SMPS_OFF;
1001 else if (rx_chains_dynamic > 1)
1002 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
1003 else
1004 local->smps_mode = IEEE80211_SMPS_STATIC;
1005 ieee80211_hw_config(local, 0);
1006 }
1007
1008 if (rx_chains_static == chanctx->conf.rx_chains_static &&
1009 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
1010 return;
1011
1012 chanctx->conf.rx_chains_static = rx_chains_static;
1013 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
1014 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
1015 }
1016
1017 static void
__ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1018 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1019 bool clear)
1020 {
1021 struct ieee80211_sub_if_data *sdata = link->sdata;
1022 unsigned int link_id = link->link_id;
1023 struct ieee80211_bss_conf *link_conf = link->conf;
1024 struct ieee80211_local *local __maybe_unused = sdata->local;
1025 struct ieee80211_sub_if_data *vlan;
1026 struct ieee80211_chanctx_conf *conf;
1027
1028 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
1029 return;
1030
1031 lockdep_assert_wiphy(local->hw.wiphy);
1032
1033 /* Check that conf exists, even when clearing this function
1034 * must be called with the AP's channel context still there
1035 * as it would otherwise cause VLANs to have an invalid
1036 * channel context pointer for a while, possibly pointing
1037 * to a channel context that has already been freed.
1038 */
1039 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1040 lockdep_is_held(&local->hw.wiphy->mtx));
1041 WARN_ON(!conf);
1042
1043 if (clear)
1044 conf = NULL;
1045
1046 rcu_read_lock();
1047 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1048 struct ieee80211_bss_conf *vlan_conf;
1049
1050 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1051 if (WARN_ON(!vlan_conf))
1052 continue;
1053
1054 rcu_assign_pointer(vlan_conf->chanctx_conf, conf);
1055 }
1056 rcu_read_unlock();
1057 }
1058
ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1059 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1060 bool clear)
1061 {
1062 struct ieee80211_local *local = link->sdata->local;
1063
1064 lockdep_assert_wiphy(local->hw.wiphy);
1065
1066 __ieee80211_link_copy_chanctx_to_vlans(link, clear);
1067 }
1068
ieee80211_link_unreserve_chanctx(struct ieee80211_link_data * link)1069 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
1070 {
1071 struct ieee80211_sub_if_data *sdata = link->sdata;
1072 struct ieee80211_chanctx *ctx = link->reserved_chanctx;
1073
1074 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1075
1076 if (WARN_ON(!ctx))
1077 return -EINVAL;
1078
1079 list_del(&link->reserved_chanctx_list);
1080 link->reserved_chanctx = NULL;
1081
1082 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
1083 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1084 if (WARN_ON(!ctx->replace_ctx))
1085 return -EINVAL;
1086
1087 WARN_ON(ctx->replace_ctx->replace_state !=
1088 IEEE80211_CHANCTX_WILL_BE_REPLACED);
1089 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
1090
1091 ctx->replace_ctx->replace_ctx = NULL;
1092 ctx->replace_ctx->replace_state =
1093 IEEE80211_CHANCTX_REPLACE_NONE;
1094
1095 list_del_rcu(&ctx->list);
1096 kfree_rcu(ctx, rcu_head);
1097 } else {
1098 ieee80211_free_chanctx(sdata->local, ctx);
1099 }
1100 }
1101
1102 return 0;
1103 }
1104
ieee80211_link_reserve_chanctx(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode,bool radar_required)1105 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
1106 const struct cfg80211_chan_def *chandef,
1107 enum ieee80211_chanctx_mode mode,
1108 bool radar_required)
1109 {
1110 struct ieee80211_sub_if_data *sdata = link->sdata;
1111 struct ieee80211_local *local = sdata->local;
1112 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
1113
1114 lockdep_assert_wiphy(local->hw.wiphy);
1115
1116 curr_ctx = ieee80211_link_get_chanctx(link);
1117 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
1118 return -EOPNOTSUPP;
1119
1120 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
1121 if (!new_ctx) {
1122 if (ieee80211_can_create_new_chanctx(local)) {
1123 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
1124 if (IS_ERR(new_ctx))
1125 return PTR_ERR(new_ctx);
1126 } else {
1127 if (!curr_ctx ||
1128 (curr_ctx->replace_state ==
1129 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1130 !list_empty(&curr_ctx->reserved_links)) {
1131 /*
1132 * Another link already requested this context
1133 * for a reservation. Find another one hoping
1134 * all links assigned to it will also switch
1135 * soon enough.
1136 *
1137 * TODO: This needs a little more work as some
1138 * cases (more than 2 chanctx capable devices)
1139 * may fail which could otherwise succeed
1140 * provided some channel context juggling was
1141 * performed.
1142 *
1143 * Consider ctx1..3, link1..6, each ctx has 2
1144 * links. link1 and link2 from ctx1 request new
1145 * different chandefs starting 2 in-place
1146 * reserations with ctx4 and ctx5 replacing
1147 * ctx1 and ctx2 respectively. Next link5 and
1148 * link6 from ctx3 reserve ctx4. If link3 and
1149 * link4 remain on ctx2 as they are then this
1150 * fails unless `replace_ctx` from ctx5 is
1151 * replaced with ctx3.
1152 */
1153 list_for_each_entry(ctx, &local->chanctx_list,
1154 list) {
1155 if (ctx->replace_state !=
1156 IEEE80211_CHANCTX_REPLACE_NONE)
1157 continue;
1158
1159 if (!list_empty(&ctx->reserved_links))
1160 continue;
1161
1162 curr_ctx = ctx;
1163 break;
1164 }
1165 }
1166
1167 /*
1168 * If that's true then all available contexts already
1169 * have reservations and cannot be used.
1170 */
1171 if (!curr_ctx ||
1172 (curr_ctx->replace_state ==
1173 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1174 !list_empty(&curr_ctx->reserved_links))
1175 return -EBUSY;
1176
1177 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1178 if (!new_ctx)
1179 return -ENOMEM;
1180
1181 new_ctx->replace_ctx = curr_ctx;
1182 new_ctx->replace_state =
1183 IEEE80211_CHANCTX_REPLACES_OTHER;
1184
1185 curr_ctx->replace_ctx = new_ctx;
1186 curr_ctx->replace_state =
1187 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1188
1189 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1190 }
1191 }
1192
1193 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
1194 link->reserved_chanctx = new_ctx;
1195 link->reserved_chandef = *chandef;
1196 link->reserved_radar_required = radar_required;
1197 link->reserved_ready = false;
1198
1199 return 0;
1200 }
1201
1202 static void
ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data * link)1203 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link)
1204 {
1205 struct ieee80211_sub_if_data *sdata = link->sdata;
1206
1207 switch (sdata->vif.type) {
1208 case NL80211_IFTYPE_ADHOC:
1209 case NL80211_IFTYPE_AP:
1210 case NL80211_IFTYPE_MESH_POINT:
1211 case NL80211_IFTYPE_OCB:
1212 wiphy_work_queue(sdata->local->hw.wiphy,
1213 &link->csa_finalize_work);
1214 break;
1215 case NL80211_IFTYPE_STATION:
1216 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1217 &link->u.mgd.chswitch_work, 0);
1218 break;
1219 case NL80211_IFTYPE_UNSPECIFIED:
1220 case NL80211_IFTYPE_AP_VLAN:
1221 case NL80211_IFTYPE_WDS:
1222 case NL80211_IFTYPE_MONITOR:
1223 case NL80211_IFTYPE_P2P_CLIENT:
1224 case NL80211_IFTYPE_P2P_GO:
1225 case NL80211_IFTYPE_P2P_DEVICE:
1226 case NL80211_IFTYPE_NAN:
1227 case NUM_NL80211_IFTYPES:
1228 WARN_ON(1);
1229 break;
1230 }
1231 }
1232
1233 static void
ieee80211_link_update_chandef(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef)1234 ieee80211_link_update_chandef(struct ieee80211_link_data *link,
1235 const struct cfg80211_chan_def *chandef)
1236 {
1237 struct ieee80211_sub_if_data *sdata = link->sdata;
1238 unsigned int link_id = link->link_id;
1239 struct ieee80211_sub_if_data *vlan;
1240
1241 link->conf->chandef = *chandef;
1242
1243 if (sdata->vif.type != NL80211_IFTYPE_AP)
1244 return;
1245
1246 rcu_read_lock();
1247 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1248 struct ieee80211_bss_conf *vlan_conf;
1249
1250 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1251 if (WARN_ON(!vlan_conf))
1252 continue;
1253
1254 vlan_conf->chandef = *chandef;
1255 }
1256 rcu_read_unlock();
1257 }
1258
1259 static int
ieee80211_link_use_reserved_reassign(struct ieee80211_link_data * link)1260 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link)
1261 {
1262 struct ieee80211_sub_if_data *sdata = link->sdata;
1263 struct ieee80211_bss_conf *link_conf = link->conf;
1264 struct ieee80211_local *local = sdata->local;
1265 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1266 struct ieee80211_chanctx *old_ctx, *new_ctx;
1267 const struct cfg80211_chan_def *chandef;
1268 u64 changed = 0;
1269 int err;
1270
1271 lockdep_assert_wiphy(local->hw.wiphy);
1272
1273 new_ctx = link->reserved_chanctx;
1274 old_ctx = ieee80211_link_get_chanctx(link);
1275
1276 if (WARN_ON(!link->reserved_ready))
1277 return -EBUSY;
1278
1279 if (WARN_ON(!new_ctx))
1280 return -EINVAL;
1281
1282 if (WARN_ON(!old_ctx))
1283 return -EINVAL;
1284
1285 if (WARN_ON(new_ctx->replace_state ==
1286 IEEE80211_CHANCTX_REPLACES_OTHER))
1287 return -EINVAL;
1288
1289 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1290 &link->reserved_chandef);
1291 if (WARN_ON(!chandef))
1292 return -EINVAL;
1293
1294 if (link_conf->chandef.width != link->reserved_chandef.width)
1295 changed = BSS_CHANGED_BANDWIDTH;
1296
1297 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1298
1299 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef, link);
1300
1301 vif_chsw[0].vif = &sdata->vif;
1302 vif_chsw[0].old_ctx = &old_ctx->conf;
1303 vif_chsw[0].new_ctx = &new_ctx->conf;
1304 vif_chsw[0].link_conf = link->conf;
1305
1306 list_del(&link->reserved_chanctx_list);
1307 link->reserved_chanctx = NULL;
1308
1309 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1310 CHANCTX_SWMODE_REASSIGN_VIF);
1311 if (err) {
1312 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1313 ieee80211_free_chanctx(local, new_ctx);
1314
1315 goto out;
1316 }
1317
1318 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links);
1319 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf);
1320
1321 if (sdata->vif.type == NL80211_IFTYPE_AP)
1322 __ieee80211_link_copy_chanctx_to_vlans(link, false);
1323
1324 ieee80211_check_fast_xmit_iface(sdata);
1325
1326 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1327 ieee80211_free_chanctx(local, old_ctx);
1328
1329 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
1330 ieee80211_recalc_smps_chanctx(local, new_ctx);
1331 ieee80211_recalc_radar_chanctx(local, new_ctx);
1332
1333 if (changed)
1334 ieee80211_link_info_change_notify(sdata, link, changed);
1335
1336 out:
1337 ieee80211_link_chanctx_reservation_complete(link);
1338 return err;
1339 }
1340
1341 static int
ieee80211_link_use_reserved_assign(struct ieee80211_link_data * link)1342 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
1343 {
1344 struct ieee80211_sub_if_data *sdata = link->sdata;
1345 struct ieee80211_local *local = sdata->local;
1346 struct ieee80211_chanctx *old_ctx, *new_ctx;
1347 const struct cfg80211_chan_def *chandef;
1348 int err;
1349
1350 old_ctx = ieee80211_link_get_chanctx(link);
1351 new_ctx = link->reserved_chanctx;
1352
1353 if (WARN_ON(!link->reserved_ready))
1354 return -EINVAL;
1355
1356 if (WARN_ON(old_ctx))
1357 return -EINVAL;
1358
1359 if (WARN_ON(!new_ctx))
1360 return -EINVAL;
1361
1362 if (WARN_ON(new_ctx->replace_state ==
1363 IEEE80211_CHANCTX_REPLACES_OTHER))
1364 return -EINVAL;
1365
1366 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1367 &link->reserved_chandef);
1368 if (WARN_ON(!chandef))
1369 return -EINVAL;
1370
1371 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1372
1373 list_del(&link->reserved_chanctx_list);
1374 link->reserved_chanctx = NULL;
1375
1376 err = ieee80211_assign_link_chanctx(link, new_ctx);
1377 if (err) {
1378 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1379 ieee80211_free_chanctx(local, new_ctx);
1380
1381 goto out;
1382 }
1383
1384 out:
1385 ieee80211_link_chanctx_reservation_complete(link);
1386 return err;
1387 }
1388
1389 static bool
ieee80211_link_has_in_place_reservation(struct ieee80211_link_data * link)1390 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link)
1391 {
1392 struct ieee80211_sub_if_data *sdata = link->sdata;
1393 struct ieee80211_chanctx *old_ctx, *new_ctx;
1394
1395 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1396
1397 new_ctx = link->reserved_chanctx;
1398 old_ctx = ieee80211_link_get_chanctx(link);
1399
1400 if (!old_ctx)
1401 return false;
1402
1403 if (WARN_ON(!new_ctx))
1404 return false;
1405
1406 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1407 return false;
1408
1409 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1410 return false;
1411
1412 return true;
1413 }
1414
ieee80211_chsw_switch_hwconf(struct ieee80211_local * local,struct ieee80211_chanctx * new_ctx)1415 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1416 struct ieee80211_chanctx *new_ctx)
1417 {
1418 const struct cfg80211_chan_def *chandef;
1419
1420 lockdep_assert_wiphy(local->hw.wiphy);
1421
1422 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1423 if (WARN_ON(!chandef))
1424 return -EINVAL;
1425
1426 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1427 local->_oper_chandef = *chandef;
1428 ieee80211_hw_config(local, 0);
1429
1430 return 0;
1431 }
1432
ieee80211_chsw_switch_vifs(struct ieee80211_local * local,int n_vifs)1433 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1434 int n_vifs)
1435 {
1436 struct ieee80211_vif_chanctx_switch *vif_chsw;
1437 struct ieee80211_link_data *link;
1438 struct ieee80211_chanctx *ctx, *old_ctx;
1439 int i, err;
1440
1441 lockdep_assert_wiphy(local->hw.wiphy);
1442
1443 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1444 if (!vif_chsw)
1445 return -ENOMEM;
1446
1447 i = 0;
1448 list_for_each_entry(ctx, &local->chanctx_list, list) {
1449 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1450 continue;
1451
1452 if (WARN_ON(!ctx->replace_ctx)) {
1453 err = -EINVAL;
1454 goto out;
1455 }
1456
1457 list_for_each_entry(link, &ctx->reserved_links,
1458 reserved_chanctx_list) {
1459 if (!ieee80211_link_has_in_place_reservation(link))
1460 continue;
1461
1462 old_ctx = ieee80211_link_get_chanctx(link);
1463 vif_chsw[i].vif = &link->sdata->vif;
1464 vif_chsw[i].old_ctx = &old_ctx->conf;
1465 vif_chsw[i].new_ctx = &ctx->conf;
1466 vif_chsw[i].link_conf = link->conf;
1467
1468 i++;
1469 }
1470 }
1471
1472 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1473 CHANCTX_SWMODE_SWAP_CONTEXTS);
1474
1475 out:
1476 kfree(vif_chsw);
1477 return err;
1478 }
1479
ieee80211_chsw_switch_ctxs(struct ieee80211_local * local)1480 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1481 {
1482 struct ieee80211_chanctx *ctx;
1483 int err;
1484
1485 lockdep_assert_wiphy(local->hw.wiphy);
1486
1487 list_for_each_entry(ctx, &local->chanctx_list, list) {
1488 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1489 continue;
1490
1491 if (!list_empty(&ctx->replace_ctx->assigned_links))
1492 continue;
1493
1494 ieee80211_del_chanctx(local, ctx->replace_ctx);
1495 err = ieee80211_add_chanctx(local, ctx);
1496 if (err)
1497 goto err;
1498 }
1499
1500 return 0;
1501
1502 err:
1503 WARN_ON(ieee80211_add_chanctx(local, ctx));
1504 list_for_each_entry_continue_reverse(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);
1512 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1513 }
1514
1515 return err;
1516 }
1517
ieee80211_vif_use_reserved_switch(struct ieee80211_local * local)1518 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1519 {
1520 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1521 struct ieee80211_chanctx *new_ctx = NULL;
1522 int err, n_assigned, n_reserved, n_ready;
1523 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1524
1525 lockdep_assert_wiphy(local->hw.wiphy);
1526
1527 /*
1528 * If there are 2 independent pairs of channel contexts performing
1529 * cross-switch of their vifs this code will still wait until both are
1530 * ready even though it could be possible to switch one before the
1531 * other is ready.
1532 *
1533 * For practical reasons and code simplicity just do a single huge
1534 * switch.
1535 */
1536
1537 /*
1538 * Verify if the reservation is still feasible.
1539 * - if it's not then disconnect
1540 * - if it is but not all vifs necessary are ready then defer
1541 */
1542
1543 list_for_each_entry(ctx, &local->chanctx_list, list) {
1544 struct ieee80211_link_data *link;
1545
1546 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1547 continue;
1548
1549 if (WARN_ON(!ctx->replace_ctx)) {
1550 err = -EINVAL;
1551 goto err;
1552 }
1553
1554 if (!local->use_chanctx)
1555 new_ctx = ctx;
1556
1557 n_ctx++;
1558
1559 n_assigned = 0;
1560 n_reserved = 0;
1561 n_ready = 0;
1562
1563 list_for_each_entry(link, &ctx->replace_ctx->assigned_links,
1564 assigned_chanctx_list) {
1565 n_assigned++;
1566 if (link->reserved_chanctx) {
1567 n_reserved++;
1568 if (link->reserved_ready)
1569 n_ready++;
1570 }
1571 }
1572
1573 if (n_assigned != n_reserved) {
1574 if (n_ready == n_reserved) {
1575 wiphy_info(local->hw.wiphy,
1576 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1577 err = -EBUSY;
1578 goto err;
1579 }
1580
1581 return -EAGAIN;
1582 }
1583
1584 ctx->conf.radar_enabled = false;
1585 list_for_each_entry(link, &ctx->reserved_links,
1586 reserved_chanctx_list) {
1587 if (ieee80211_link_has_in_place_reservation(link) &&
1588 !link->reserved_ready)
1589 return -EAGAIN;
1590
1591 old_ctx = ieee80211_link_get_chanctx(link);
1592 if (old_ctx) {
1593 if (old_ctx->replace_state ==
1594 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1595 n_vifs_switch++;
1596 else
1597 n_vifs_assign++;
1598 } else {
1599 n_vifs_ctxless++;
1600 }
1601
1602 if (link->reserved_radar_required)
1603 ctx->conf.radar_enabled = true;
1604 }
1605 }
1606
1607 if (WARN_ON(n_ctx == 0) ||
1608 WARN_ON(n_vifs_switch == 0 &&
1609 n_vifs_assign == 0 &&
1610 n_vifs_ctxless == 0) ||
1611 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1612 WARN_ON(!new_ctx && !local->use_chanctx)) {
1613 err = -EINVAL;
1614 goto err;
1615 }
1616
1617 /*
1618 * All necessary vifs are ready. Perform the switch now depending on
1619 * reservations and driver capabilities.
1620 */
1621
1622 if (local->use_chanctx) {
1623 if (n_vifs_switch > 0) {
1624 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1625 if (err)
1626 goto err;
1627 }
1628
1629 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1630 err = ieee80211_chsw_switch_ctxs(local);
1631 if (err)
1632 goto err;
1633 }
1634 } else {
1635 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1636 if (err)
1637 goto err;
1638 }
1639
1640 /*
1641 * Update all structures, values and pointers to point to new channel
1642 * context(s).
1643 */
1644 list_for_each_entry(ctx, &local->chanctx_list, list) {
1645 struct ieee80211_link_data *link, *link_tmp;
1646
1647 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1648 continue;
1649
1650 if (WARN_ON(!ctx->replace_ctx)) {
1651 err = -EINVAL;
1652 goto err;
1653 }
1654
1655 list_for_each_entry(link, &ctx->reserved_links,
1656 reserved_chanctx_list) {
1657 struct ieee80211_sub_if_data *sdata = link->sdata;
1658 struct ieee80211_bss_conf *link_conf = link->conf;
1659 u64 changed = 0;
1660
1661 if (!ieee80211_link_has_in_place_reservation(link))
1662 continue;
1663
1664 rcu_assign_pointer(link_conf->chanctx_conf,
1665 &ctx->conf);
1666
1667 if (sdata->vif.type == NL80211_IFTYPE_AP)
1668 __ieee80211_link_copy_chanctx_to_vlans(link,
1669 false);
1670
1671 ieee80211_check_fast_xmit_iface(sdata);
1672
1673 link->radar_required = link->reserved_radar_required;
1674
1675 if (link_conf->chandef.width != link->reserved_chandef.width)
1676 changed = BSS_CHANGED_BANDWIDTH;
1677
1678 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1679 if (changed)
1680 ieee80211_link_info_change_notify(sdata,
1681 link,
1682 changed);
1683
1684 ieee80211_recalc_txpower(sdata, false);
1685 }
1686
1687 ieee80211_recalc_chanctx_chantype(local, ctx);
1688 ieee80211_recalc_smps_chanctx(local, ctx);
1689 ieee80211_recalc_radar_chanctx(local, ctx);
1690 ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
1691
1692 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1693 reserved_chanctx_list) {
1694 if (ieee80211_link_get_chanctx(link) != ctx)
1695 continue;
1696
1697 list_del(&link->reserved_chanctx_list);
1698 list_move(&link->assigned_chanctx_list,
1699 &ctx->assigned_links);
1700 link->reserved_chanctx = NULL;
1701
1702 ieee80211_link_chanctx_reservation_complete(link);
1703 }
1704
1705 /*
1706 * This context might have been a dependency for an already
1707 * ready re-assign reservation interface that was deferred. Do
1708 * not propagate error to the caller though. The in-place
1709 * reservation for originally requested interface has already
1710 * succeeded at this point.
1711 */
1712 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1713 reserved_chanctx_list) {
1714 if (WARN_ON(ieee80211_link_has_in_place_reservation(link)))
1715 continue;
1716
1717 if (WARN_ON(link->reserved_chanctx != ctx))
1718 continue;
1719
1720 if (!link->reserved_ready)
1721 continue;
1722
1723 if (ieee80211_link_get_chanctx(link))
1724 err = ieee80211_link_use_reserved_reassign(link);
1725 else
1726 err = ieee80211_link_use_reserved_assign(link);
1727
1728 if (err) {
1729 link_info(link,
1730 "failed to finalize (re-)assign reservation (err=%d)\n",
1731 err);
1732 ieee80211_link_unreserve_chanctx(link);
1733 cfg80211_stop_iface(local->hw.wiphy,
1734 &link->sdata->wdev,
1735 GFP_KERNEL);
1736 }
1737 }
1738 }
1739
1740 /*
1741 * Finally free old contexts
1742 */
1743
1744 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1745 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1746 continue;
1747
1748 ctx->replace_ctx->replace_ctx = NULL;
1749 ctx->replace_ctx->replace_state =
1750 IEEE80211_CHANCTX_REPLACE_NONE;
1751
1752 list_del_rcu(&ctx->list);
1753 kfree_rcu(ctx, rcu_head);
1754 }
1755
1756 return 0;
1757
1758 err:
1759 list_for_each_entry(ctx, &local->chanctx_list, list) {
1760 struct ieee80211_link_data *link, *link_tmp;
1761
1762 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1763 continue;
1764
1765 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1766 reserved_chanctx_list) {
1767 ieee80211_link_unreserve_chanctx(link);
1768 ieee80211_link_chanctx_reservation_complete(link);
1769 }
1770 }
1771
1772 return err;
1773 }
1774
__ieee80211_link_release_channel(struct ieee80211_link_data * link)1775 static void __ieee80211_link_release_channel(struct ieee80211_link_data *link)
1776 {
1777 struct ieee80211_sub_if_data *sdata = link->sdata;
1778 struct ieee80211_bss_conf *link_conf = link->conf;
1779 struct ieee80211_local *local = sdata->local;
1780 struct ieee80211_chanctx_conf *conf;
1781 struct ieee80211_chanctx *ctx;
1782 bool use_reserved_switch = false;
1783
1784 lockdep_assert_wiphy(local->hw.wiphy);
1785
1786 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1787 lockdep_is_held(&local->hw.wiphy->mtx));
1788 if (!conf)
1789 return;
1790
1791 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1792
1793 if (link->reserved_chanctx) {
1794 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
1795 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1)
1796 use_reserved_switch = true;
1797
1798 ieee80211_link_unreserve_chanctx(link);
1799 }
1800
1801 ieee80211_assign_link_chanctx(link, NULL);
1802 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1803 ieee80211_free_chanctx(local, ctx);
1804
1805 link->radar_required = false;
1806
1807 /* Unreserving may ready an in-place reservation. */
1808 if (use_reserved_switch)
1809 ieee80211_vif_use_reserved_switch(local);
1810 }
1811
ieee80211_link_use_channel(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)1812 int ieee80211_link_use_channel(struct ieee80211_link_data *link,
1813 const struct cfg80211_chan_def *chandef,
1814 enum ieee80211_chanctx_mode mode)
1815 {
1816 struct ieee80211_sub_if_data *sdata = link->sdata;
1817 struct ieee80211_local *local = sdata->local;
1818 struct ieee80211_chanctx *ctx;
1819 u8 radar_detect_width = 0;
1820 int ret;
1821
1822 lockdep_assert_wiphy(local->hw.wiphy);
1823
1824 if (sdata->vif.active_links &&
1825 !(sdata->vif.active_links & BIT(link->link_id))) {
1826 ieee80211_link_update_chandef(link, chandef);
1827 return 0;
1828 }
1829
1830 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1831 chandef,
1832 sdata->wdev.iftype);
1833 if (ret < 0)
1834 goto out;
1835 if (ret > 0)
1836 radar_detect_width = BIT(chandef->width);
1837
1838 link->radar_required = ret;
1839
1840 ret = ieee80211_check_combinations(sdata, chandef, mode,
1841 radar_detect_width);
1842 if (ret < 0)
1843 goto out;
1844
1845 __ieee80211_link_release_channel(link);
1846
1847 ctx = ieee80211_find_chanctx(local, chandef, mode);
1848 if (!ctx)
1849 ctx = ieee80211_new_chanctx(local, chandef, mode);
1850 if (IS_ERR(ctx)) {
1851 ret = PTR_ERR(ctx);
1852 goto out;
1853 }
1854
1855 ieee80211_link_update_chandef(link, chandef);
1856
1857 ret = ieee80211_assign_link_chanctx(link, ctx);
1858 if (ret) {
1859 /* if assign fails refcount stays the same */
1860 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1861 ieee80211_free_chanctx(local, ctx);
1862 goto out;
1863 }
1864
1865 ieee80211_recalc_smps_chanctx(local, ctx);
1866 ieee80211_recalc_radar_chanctx(local, ctx);
1867 out:
1868 if (ret)
1869 link->radar_required = false;
1870
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_wiphy(local->hw.wiphy);
1883
1884 new_ctx = link->reserved_chanctx;
1885 old_ctx = ieee80211_link_get_chanctx(link);
1886
1887 if (WARN_ON(!new_ctx))
1888 return -EINVAL;
1889
1890 if (WARN_ON(new_ctx->replace_state ==
1891 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1892 return -EINVAL;
1893
1894 if (WARN_ON(link->reserved_ready))
1895 return -EINVAL;
1896
1897 link->reserved_ready = true;
1898
1899 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1900 if (old_ctx)
1901 return ieee80211_link_use_reserved_reassign(link);
1902
1903 return ieee80211_link_use_reserved_assign(link);
1904 }
1905
1906 /*
1907 * In-place reservation may need to be finalized now either if:
1908 * a) sdata is taking part in the swapping itself and is the last one
1909 * b) sdata has switched with a re-assign reservation to an existing
1910 * context readying in-place switching of old_ctx
1911 *
1912 * In case of (b) do not propagate the error up because the requested
1913 * sdata already switched successfully. Just spill an extra warning.
1914 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1915 * interfaces upon failure.
1916 */
1917 if ((old_ctx &&
1918 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1919 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1920 err = ieee80211_vif_use_reserved_switch(local);
1921 if (err && err != -EAGAIN) {
1922 if (new_ctx->replace_state ==
1923 IEEE80211_CHANCTX_REPLACES_OTHER)
1924 return err;
1925
1926 wiphy_info(local->hw.wiphy,
1927 "depending in-place reservation failed (err=%d)\n",
1928 err);
1929 }
1930 }
1931
1932 return 0;
1933 }
1934
ieee80211_link_change_bandwidth(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,u64 * changed)1935 int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
1936 const struct cfg80211_chan_def *chandef,
1937 u64 *changed)
1938 {
1939 struct ieee80211_sub_if_data *sdata = link->sdata;
1940 struct ieee80211_bss_conf *link_conf = link->conf;
1941 struct ieee80211_local *local = sdata->local;
1942 struct ieee80211_chanctx_conf *conf;
1943 struct ieee80211_chanctx *ctx;
1944 const struct cfg80211_chan_def *compat;
1945
1946 lockdep_assert_wiphy(local->hw.wiphy);
1947
1948 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1949 IEEE80211_CHAN_DISABLED))
1950 return -EINVAL;
1951
1952 if (cfg80211_chandef_identical(chandef, &link_conf->chandef))
1953 return 0;
1954
1955 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1956 link_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
1957 return -EINVAL;
1958
1959 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1960 lockdep_is_held(&local->hw.wiphy->mtx));
1961 if (!conf)
1962 return -EINVAL;
1963
1964 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1965
1966 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1967 if (!compat)
1968 return -EINVAL;
1969
1970 switch (ctx->replace_state) {
1971 case IEEE80211_CHANCTX_REPLACE_NONE:
1972 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat))
1973 return -EBUSY;
1974 break;
1975 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1976 /* TODO: Perhaps the bandwidth change could be treated as a
1977 * reservation itself? */
1978 return -EBUSY;
1979 case IEEE80211_CHANCTX_REPLACES_OTHER:
1980 /* channel context that is going to replace another channel
1981 * context doesn't really exist and shouldn't be assigned
1982 * anywhere yet */
1983 WARN_ON(1);
1984 break;
1985 }
1986
1987 ieee80211_link_update_chandef(link, chandef);
1988
1989 ieee80211_recalc_chanctx_chantype(local, ctx);
1990
1991 *changed |= BSS_CHANGED_BANDWIDTH;
1992 return 0;
1993 }
1994
ieee80211_link_release_channel(struct ieee80211_link_data * link)1995 void ieee80211_link_release_channel(struct ieee80211_link_data *link)
1996 {
1997 struct ieee80211_sub_if_data *sdata = link->sdata;
1998
1999 lockdep_assert_wiphy(sdata->local->hw.wiphy);
2000
2001 if (rcu_access_pointer(link->conf->chanctx_conf))
2002 __ieee80211_link_release_channel(link);
2003 }
2004
ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data * link)2005 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link)
2006 {
2007 struct ieee80211_sub_if_data *sdata = link->sdata;
2008 unsigned int link_id = link->link_id;
2009 struct ieee80211_bss_conf *link_conf = link->conf;
2010 struct ieee80211_bss_conf *ap_conf;
2011 struct ieee80211_local *local = sdata->local;
2012 struct ieee80211_sub_if_data *ap;
2013 struct ieee80211_chanctx_conf *conf;
2014
2015 lockdep_assert_wiphy(local->hw.wiphy);
2016
2017 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
2018 return;
2019
2020 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
2021
2022 rcu_read_lock();
2023 ap_conf = rcu_dereference(ap->vif.link_conf[link_id]);
2024 conf = rcu_dereference_protected(ap_conf->chanctx_conf,
2025 lockdep_is_held(&local->hw.wiphy->mtx));
2026 rcu_assign_pointer(link_conf->chanctx_conf, conf);
2027 rcu_read_unlock();
2028 }
2029
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)2030 void ieee80211_iter_chan_contexts_atomic(
2031 struct ieee80211_hw *hw,
2032 void (*iter)(struct ieee80211_hw *hw,
2033 struct ieee80211_chanctx_conf *chanctx_conf,
2034 void *data),
2035 void *iter_data)
2036 {
2037 struct ieee80211_local *local = hw_to_local(hw);
2038 struct ieee80211_chanctx *ctx;
2039
2040 rcu_read_lock();
2041 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
2042 if (ctx->driver_present)
2043 iter(hw, &ctx->conf, iter_data);
2044 rcu_read_unlock();
2045 }
2046 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
2047