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 if (WARN_ON_ONCE(!compat)) {
806 rcu_read_unlock();
807 return;
808 }
809
810 /* TDLS peers can sometimes affect the chandef width */
811 list_for_each_entry_rcu(sta, &local->sta_list, list) {
812 if (!sta->uploaded ||
813 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
814 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
815 !sta->tdls_chandef.chan)
816 continue;
817
818 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
819 compat);
820 if (WARN_ON_ONCE(!compat))
821 break;
822 }
823 rcu_read_unlock();
824
825 if (!compat)
826 return;
827
828 ieee80211_change_chanctx(local, ctx, ctx, compat);
829 }
830
ieee80211_recalc_radar_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)831 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
832 struct ieee80211_chanctx *chanctx)
833 {
834 bool radar_enabled;
835
836 lockdep_assert_held(&local->chanctx_mtx);
837 /* for ieee80211_is_radar_required */
838 lockdep_assert_held(&local->mtx);
839
840 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
841
842 if (radar_enabled == chanctx->conf.radar_enabled)
843 return;
844
845 chanctx->conf.radar_enabled = radar_enabled;
846
847 if (!local->use_chanctx) {
848 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
849 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
850 }
851
852 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
853 }
854
ieee80211_assign_link_chanctx(struct ieee80211_link_data * link,struct ieee80211_chanctx * new_ctx)855 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
856 struct ieee80211_chanctx *new_ctx)
857 {
858 struct ieee80211_sub_if_data *sdata = link->sdata;
859 struct ieee80211_local *local = sdata->local;
860 struct ieee80211_chanctx_conf *conf;
861 struct ieee80211_chanctx *curr_ctx = NULL;
862 int ret = 0;
863
864 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
865 return -ENOTSUPP;
866
867 conf = rcu_dereference_protected(link->conf->chanctx_conf,
868 lockdep_is_held(&local->chanctx_mtx));
869
870 if (conf) {
871 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
872
873 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx);
874 conf = NULL;
875 list_del(&link->assigned_chanctx_list);
876 }
877
878 if (new_ctx) {
879 /* recalc considering the link we'll use it for now */
880 ieee80211_recalc_chanctx_min_def(local, new_ctx, link);
881
882 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
883 if (ret)
884 goto out;
885
886 conf = &new_ctx->conf;
887 list_add(&link->assigned_chanctx_list,
888 &new_ctx->assigned_links);
889 }
890
891 out:
892 rcu_assign_pointer(link->conf->chanctx_conf, conf);
893
894 sdata->vif.cfg.idle = !conf;
895
896 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
897 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
898 ieee80211_recalc_smps_chanctx(local, curr_ctx);
899 ieee80211_recalc_radar_chanctx(local, curr_ctx);
900 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL);
901 }
902
903 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
904 ieee80211_recalc_txpower(sdata, false);
905 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
906 }
907
908 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
909 sdata->vif.type != NL80211_IFTYPE_MONITOR)
910 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE);
911
912 ieee80211_check_fast_xmit_iface(sdata);
913
914 return ret;
915 }
916
ieee80211_recalc_smps_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)917 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
918 struct ieee80211_chanctx *chanctx)
919 {
920 struct ieee80211_sub_if_data *sdata;
921 u8 rx_chains_static, rx_chains_dynamic;
922
923 lockdep_assert_held(&local->chanctx_mtx);
924
925 rx_chains_static = 1;
926 rx_chains_dynamic = 1;
927
928 rcu_read_lock();
929 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
930 u8 needed_static, needed_dynamic;
931 unsigned int link_id;
932
933 if (!ieee80211_sdata_running(sdata))
934 continue;
935
936 switch (sdata->vif.type) {
937 case NL80211_IFTYPE_STATION:
938 if (!sdata->u.mgd.associated)
939 continue;
940 break;
941 case NL80211_IFTYPE_AP:
942 case NL80211_IFTYPE_ADHOC:
943 case NL80211_IFTYPE_MESH_POINT:
944 case NL80211_IFTYPE_OCB:
945 break;
946 default:
947 continue;
948 }
949
950 for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
951 struct ieee80211_link_data *link;
952
953 link = rcu_dereference(sdata->link[link_id]);
954
955 if (!link)
956 continue;
957
958 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf)
959 continue;
960
961 switch (link->smps_mode) {
962 default:
963 WARN_ONCE(1, "Invalid SMPS mode %d\n",
964 link->smps_mode);
965 fallthrough;
966 case IEEE80211_SMPS_OFF:
967 needed_static = link->needed_rx_chains;
968 needed_dynamic = link->needed_rx_chains;
969 break;
970 case IEEE80211_SMPS_DYNAMIC:
971 needed_static = 1;
972 needed_dynamic = link->needed_rx_chains;
973 break;
974 case IEEE80211_SMPS_STATIC:
975 needed_static = 1;
976 needed_dynamic = 1;
977 break;
978 }
979
980 rx_chains_static = max(rx_chains_static, needed_static);
981 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
982 }
983 }
984
985 /* Disable SMPS for the monitor interface */
986 sdata = rcu_dereference(local->monitor_sdata);
987 if (sdata &&
988 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
989 rx_chains_dynamic = rx_chains_static = local->rx_chains;
990
991 rcu_read_unlock();
992
993 if (!local->use_chanctx) {
994 if (rx_chains_static > 1)
995 local->smps_mode = IEEE80211_SMPS_OFF;
996 else if (rx_chains_dynamic > 1)
997 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
998 else
999 local->smps_mode = IEEE80211_SMPS_STATIC;
1000 ieee80211_hw_config(local, 0);
1001 }
1002
1003 if (rx_chains_static == chanctx->conf.rx_chains_static &&
1004 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
1005 return;
1006
1007 chanctx->conf.rx_chains_static = rx_chains_static;
1008 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
1009 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
1010 }
1011
1012 static void
__ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1013 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1014 bool clear)
1015 {
1016 struct ieee80211_sub_if_data *sdata = link->sdata;
1017 unsigned int link_id = link->link_id;
1018 struct ieee80211_bss_conf *link_conf = link->conf;
1019 struct ieee80211_local *local __maybe_unused = sdata->local;
1020 struct ieee80211_sub_if_data *vlan;
1021 struct ieee80211_chanctx_conf *conf;
1022
1023 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
1024 return;
1025
1026 lockdep_assert_held(&local->mtx);
1027
1028 /* Check that conf exists, even when clearing this function
1029 * must be called with the AP's channel context still there
1030 * as it would otherwise cause VLANs to have an invalid
1031 * channel context pointer for a while, possibly pointing
1032 * to a channel context that has already been freed.
1033 */
1034 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1035 lockdep_is_held(&local->chanctx_mtx));
1036 WARN_ON(!conf);
1037
1038 if (clear)
1039 conf = NULL;
1040
1041 rcu_read_lock();
1042 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1043 struct ieee80211_bss_conf *vlan_conf;
1044
1045 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1046 if (WARN_ON(!vlan_conf))
1047 continue;
1048
1049 rcu_assign_pointer(vlan_conf->chanctx_conf, conf);
1050 }
1051 rcu_read_unlock();
1052 }
1053
ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1054 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1055 bool clear)
1056 {
1057 struct ieee80211_local *local = link->sdata->local;
1058
1059 mutex_lock(&local->chanctx_mtx);
1060
1061 __ieee80211_link_copy_chanctx_to_vlans(link, clear);
1062
1063 mutex_unlock(&local->chanctx_mtx);
1064 }
1065
ieee80211_link_unreserve_chanctx(struct ieee80211_link_data * link)1066 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
1067 {
1068 struct ieee80211_sub_if_data *sdata = link->sdata;
1069 struct ieee80211_chanctx *ctx = link->reserved_chanctx;
1070
1071 lockdep_assert_held(&sdata->local->chanctx_mtx);
1072
1073 if (WARN_ON(!ctx))
1074 return -EINVAL;
1075
1076 list_del(&link->reserved_chanctx_list);
1077 link->reserved_chanctx = NULL;
1078
1079 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
1080 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1081 if (WARN_ON(!ctx->replace_ctx))
1082 return -EINVAL;
1083
1084 WARN_ON(ctx->replace_ctx->replace_state !=
1085 IEEE80211_CHANCTX_WILL_BE_REPLACED);
1086 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
1087
1088 ctx->replace_ctx->replace_ctx = NULL;
1089 ctx->replace_ctx->replace_state =
1090 IEEE80211_CHANCTX_REPLACE_NONE;
1091
1092 list_del_rcu(&ctx->list);
1093 kfree_rcu(ctx, rcu_head);
1094 } else {
1095 ieee80211_free_chanctx(sdata->local, ctx);
1096 }
1097 }
1098
1099 return 0;
1100 }
1101
ieee80211_link_reserve_chanctx(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode,bool radar_required)1102 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
1103 const struct cfg80211_chan_def *chandef,
1104 enum ieee80211_chanctx_mode mode,
1105 bool radar_required)
1106 {
1107 struct ieee80211_sub_if_data *sdata = link->sdata;
1108 struct ieee80211_local *local = sdata->local;
1109 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
1110
1111 lockdep_assert_held(&local->chanctx_mtx);
1112
1113 curr_ctx = ieee80211_link_get_chanctx(link);
1114 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
1115 return -ENOTSUPP;
1116
1117 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
1118 if (!new_ctx) {
1119 if (ieee80211_can_create_new_chanctx(local)) {
1120 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
1121 if (IS_ERR(new_ctx))
1122 return PTR_ERR(new_ctx);
1123 } else {
1124 if (!curr_ctx ||
1125 (curr_ctx->replace_state ==
1126 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1127 !list_empty(&curr_ctx->reserved_links)) {
1128 /*
1129 * Another link already requested this context
1130 * for a reservation. Find another one hoping
1131 * all links assigned to it will also switch
1132 * soon enough.
1133 *
1134 * TODO: This needs a little more work as some
1135 * cases (more than 2 chanctx capable devices)
1136 * may fail which could otherwise succeed
1137 * provided some channel context juggling was
1138 * performed.
1139 *
1140 * Consider ctx1..3, link1..6, each ctx has 2
1141 * links. link1 and link2 from ctx1 request new
1142 * different chandefs starting 2 in-place
1143 * reserations with ctx4 and ctx5 replacing
1144 * ctx1 and ctx2 respectively. Next link5 and
1145 * link6 from ctx3 reserve ctx4. If link3 and
1146 * link4 remain on ctx2 as they are then this
1147 * fails unless `replace_ctx` from ctx5 is
1148 * replaced with ctx3.
1149 */
1150 list_for_each_entry(ctx, &local->chanctx_list,
1151 list) {
1152 if (ctx->replace_state !=
1153 IEEE80211_CHANCTX_REPLACE_NONE)
1154 continue;
1155
1156 if (!list_empty(&ctx->reserved_links))
1157 continue;
1158
1159 curr_ctx = ctx;
1160 break;
1161 }
1162 }
1163
1164 /*
1165 * If that's true then all available contexts already
1166 * have reservations and cannot be used.
1167 */
1168 if (!curr_ctx ||
1169 (curr_ctx->replace_state ==
1170 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1171 !list_empty(&curr_ctx->reserved_links))
1172 return -EBUSY;
1173
1174 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1175 if (!new_ctx)
1176 return -ENOMEM;
1177
1178 new_ctx->replace_ctx = curr_ctx;
1179 new_ctx->replace_state =
1180 IEEE80211_CHANCTX_REPLACES_OTHER;
1181
1182 curr_ctx->replace_ctx = new_ctx;
1183 curr_ctx->replace_state =
1184 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1185
1186 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1187 }
1188 }
1189
1190 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
1191 link->reserved_chanctx = new_ctx;
1192 link->reserved_chandef = *chandef;
1193 link->reserved_radar_required = radar_required;
1194 link->reserved_ready = false;
1195
1196 return 0;
1197 }
1198
1199 static void
ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data * link)1200 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link)
1201 {
1202 struct ieee80211_sub_if_data *sdata = link->sdata;
1203
1204 switch (sdata->vif.type) {
1205 case NL80211_IFTYPE_ADHOC:
1206 case NL80211_IFTYPE_AP:
1207 case NL80211_IFTYPE_MESH_POINT:
1208 case NL80211_IFTYPE_OCB:
1209 ieee80211_queue_work(&sdata->local->hw,
1210 &link->csa_finalize_work);
1211 break;
1212 case NL80211_IFTYPE_STATION:
1213 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1214 &link->u.mgd.chswitch_work, 0);
1215 break;
1216 case NL80211_IFTYPE_UNSPECIFIED:
1217 case NL80211_IFTYPE_AP_VLAN:
1218 case NL80211_IFTYPE_WDS:
1219 case NL80211_IFTYPE_MONITOR:
1220 case NL80211_IFTYPE_P2P_CLIENT:
1221 case NL80211_IFTYPE_P2P_GO:
1222 case NL80211_IFTYPE_P2P_DEVICE:
1223 case NL80211_IFTYPE_NAN:
1224 case NUM_NL80211_IFTYPES:
1225 WARN_ON(1);
1226 break;
1227 }
1228 }
1229
1230 static void
ieee80211_link_update_chandef(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef)1231 ieee80211_link_update_chandef(struct ieee80211_link_data *link,
1232 const struct cfg80211_chan_def *chandef)
1233 {
1234 struct ieee80211_sub_if_data *sdata = link->sdata;
1235 unsigned int link_id = link->link_id;
1236 struct ieee80211_sub_if_data *vlan;
1237
1238 link->conf->chandef = *chandef;
1239
1240 if (sdata->vif.type != NL80211_IFTYPE_AP)
1241 return;
1242
1243 rcu_read_lock();
1244 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1245 struct ieee80211_bss_conf *vlan_conf;
1246
1247 vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]);
1248 if (WARN_ON(!vlan_conf))
1249 continue;
1250
1251 vlan_conf->chandef = *chandef;
1252 }
1253 rcu_read_unlock();
1254 }
1255
1256 static int
ieee80211_link_use_reserved_reassign(struct ieee80211_link_data * link)1257 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link)
1258 {
1259 struct ieee80211_sub_if_data *sdata = link->sdata;
1260 struct ieee80211_bss_conf *link_conf = link->conf;
1261 struct ieee80211_local *local = sdata->local;
1262 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1263 struct ieee80211_chanctx *old_ctx, *new_ctx;
1264 const struct cfg80211_chan_def *chandef;
1265 u64 changed = 0;
1266 int err;
1267
1268 lockdep_assert_held(&local->mtx);
1269 lockdep_assert_held(&local->chanctx_mtx);
1270
1271 new_ctx = link->reserved_chanctx;
1272 old_ctx = ieee80211_link_get_chanctx(link);
1273
1274 if (WARN_ON(!link->reserved_ready))
1275 return -EBUSY;
1276
1277 if (WARN_ON(!new_ctx))
1278 return -EINVAL;
1279
1280 if (WARN_ON(!old_ctx))
1281 return -EINVAL;
1282
1283 if (WARN_ON(new_ctx->replace_state ==
1284 IEEE80211_CHANCTX_REPLACES_OTHER))
1285 return -EINVAL;
1286
1287 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1288 &link->reserved_chandef);
1289 if (WARN_ON(!chandef))
1290 return -EINVAL;
1291
1292 if (link_conf->chandef.width != link->reserved_chandef.width)
1293 changed = BSS_CHANGED_BANDWIDTH;
1294
1295 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1296
1297 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef, link);
1298
1299 vif_chsw[0].vif = &sdata->vif;
1300 vif_chsw[0].old_ctx = &old_ctx->conf;
1301 vif_chsw[0].new_ctx = &new_ctx->conf;
1302 vif_chsw[0].link_conf = link->conf;
1303
1304 list_del(&link->reserved_chanctx_list);
1305 link->reserved_chanctx = NULL;
1306
1307 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1308 CHANCTX_SWMODE_REASSIGN_VIF);
1309 if (err) {
1310 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1311 ieee80211_free_chanctx(local, new_ctx);
1312
1313 goto out;
1314 }
1315
1316 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links);
1317 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf);
1318
1319 if (sdata->vif.type == NL80211_IFTYPE_AP)
1320 __ieee80211_link_copy_chanctx_to_vlans(link, false);
1321
1322 ieee80211_check_fast_xmit_iface(sdata);
1323
1324 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1325 ieee80211_free_chanctx(local, old_ctx);
1326
1327 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL);
1328 ieee80211_recalc_smps_chanctx(local, new_ctx);
1329 ieee80211_recalc_radar_chanctx(local, new_ctx);
1330
1331 if (changed)
1332 ieee80211_link_info_change_notify(sdata, link, changed);
1333
1334 out:
1335 ieee80211_link_chanctx_reservation_complete(link);
1336 return err;
1337 }
1338
1339 static int
ieee80211_link_use_reserved_assign(struct ieee80211_link_data * link)1340 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
1341 {
1342 struct ieee80211_sub_if_data *sdata = link->sdata;
1343 struct ieee80211_local *local = sdata->local;
1344 struct ieee80211_chanctx *old_ctx, *new_ctx;
1345 const struct cfg80211_chan_def *chandef;
1346 int err;
1347
1348 old_ctx = ieee80211_link_get_chanctx(link);
1349 new_ctx = link->reserved_chanctx;
1350
1351 if (WARN_ON(!link->reserved_ready))
1352 return -EINVAL;
1353
1354 if (WARN_ON(old_ctx))
1355 return -EINVAL;
1356
1357 if (WARN_ON(!new_ctx))
1358 return -EINVAL;
1359
1360 if (WARN_ON(new_ctx->replace_state ==
1361 IEEE80211_CHANCTX_REPLACES_OTHER))
1362 return -EINVAL;
1363
1364 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1365 &link->reserved_chandef);
1366 if (WARN_ON(!chandef))
1367 return -EINVAL;
1368
1369 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1370
1371 list_del(&link->reserved_chanctx_list);
1372 link->reserved_chanctx = NULL;
1373
1374 err = ieee80211_assign_link_chanctx(link, new_ctx);
1375 if (err) {
1376 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1377 ieee80211_free_chanctx(local, new_ctx);
1378
1379 goto out;
1380 }
1381
1382 out:
1383 ieee80211_link_chanctx_reservation_complete(link);
1384 return err;
1385 }
1386
1387 static bool
ieee80211_link_has_in_place_reservation(struct ieee80211_link_data * link)1388 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link)
1389 {
1390 struct ieee80211_sub_if_data *sdata = link->sdata;
1391 struct ieee80211_chanctx *old_ctx, *new_ctx;
1392
1393 lockdep_assert_held(&sdata->local->chanctx_mtx);
1394
1395 new_ctx = link->reserved_chanctx;
1396 old_ctx = ieee80211_link_get_chanctx(link);
1397
1398 if (!old_ctx)
1399 return false;
1400
1401 if (WARN_ON(!new_ctx))
1402 return false;
1403
1404 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1405 return false;
1406
1407 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1408 return false;
1409
1410 return true;
1411 }
1412
ieee80211_chsw_switch_hwconf(struct ieee80211_local * local,struct ieee80211_chanctx * new_ctx)1413 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1414 struct ieee80211_chanctx *new_ctx)
1415 {
1416 const struct cfg80211_chan_def *chandef;
1417
1418 lockdep_assert_held(&local->mtx);
1419 lockdep_assert_held(&local->chanctx_mtx);
1420
1421 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1422 if (WARN_ON(!chandef))
1423 return -EINVAL;
1424
1425 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1426 local->_oper_chandef = *chandef;
1427 ieee80211_hw_config(local, 0);
1428
1429 return 0;
1430 }
1431
ieee80211_chsw_switch_vifs(struct ieee80211_local * local,int n_vifs)1432 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1433 int n_vifs)
1434 {
1435 struct ieee80211_vif_chanctx_switch *vif_chsw;
1436 struct ieee80211_link_data *link;
1437 struct ieee80211_chanctx *ctx, *old_ctx;
1438 int i, err;
1439
1440 lockdep_assert_held(&local->mtx);
1441 lockdep_assert_held(&local->chanctx_mtx);
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_held(&local->mtx);
1486 lockdep_assert_held(&local->chanctx_mtx);
1487
1488 list_for_each_entry(ctx, &local->chanctx_list, list) {
1489 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1490 continue;
1491
1492 if (!list_empty(&ctx->replace_ctx->assigned_links))
1493 continue;
1494
1495 ieee80211_del_chanctx(local, ctx->replace_ctx);
1496 err = ieee80211_add_chanctx(local, ctx);
1497 if (err)
1498 goto err;
1499 }
1500
1501 return 0;
1502
1503 err:
1504 WARN_ON(ieee80211_add_chanctx(local, ctx));
1505 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1506 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1507 continue;
1508
1509 if (!list_empty(&ctx->replace_ctx->assigned_links))
1510 continue;
1511
1512 ieee80211_del_chanctx(local, ctx);
1513 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1514 }
1515
1516 return err;
1517 }
1518
ieee80211_vif_use_reserved_switch(struct ieee80211_local * local)1519 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1520 {
1521 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1522 struct ieee80211_chanctx *new_ctx = NULL;
1523 int err, n_assigned, n_reserved, n_ready;
1524 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1525
1526 lockdep_assert_held(&local->mtx);
1527 lockdep_assert_held(&local->chanctx_mtx);
1528
1529 /*
1530 * If there are 2 independent pairs of channel contexts performing
1531 * cross-switch of their vifs this code will still wait until both are
1532 * ready even though it could be possible to switch one before the
1533 * other is ready.
1534 *
1535 * For practical reasons and code simplicity just do a single huge
1536 * switch.
1537 */
1538
1539 /*
1540 * Verify if the reservation is still feasible.
1541 * - if it's not then disconnect
1542 * - if it is but not all vifs necessary are ready then defer
1543 */
1544
1545 list_for_each_entry(ctx, &local->chanctx_list, list) {
1546 struct ieee80211_link_data *link;
1547
1548 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1549 continue;
1550
1551 if (WARN_ON(!ctx->replace_ctx)) {
1552 err = -EINVAL;
1553 goto err;
1554 }
1555
1556 if (!local->use_chanctx)
1557 new_ctx = ctx;
1558
1559 n_ctx++;
1560
1561 n_assigned = 0;
1562 n_reserved = 0;
1563 n_ready = 0;
1564
1565 list_for_each_entry(link, &ctx->replace_ctx->assigned_links,
1566 assigned_chanctx_list) {
1567 n_assigned++;
1568 if (link->reserved_chanctx) {
1569 n_reserved++;
1570 if (link->reserved_ready)
1571 n_ready++;
1572 }
1573 }
1574
1575 if (n_assigned != n_reserved) {
1576 if (n_ready == n_reserved) {
1577 wiphy_info(local->hw.wiphy,
1578 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1579 err = -EBUSY;
1580 goto err;
1581 }
1582
1583 return -EAGAIN;
1584 }
1585
1586 ctx->conf.radar_enabled = false;
1587 list_for_each_entry(link, &ctx->reserved_links,
1588 reserved_chanctx_list) {
1589 if (ieee80211_link_has_in_place_reservation(link) &&
1590 !link->reserved_ready)
1591 return -EAGAIN;
1592
1593 old_ctx = ieee80211_link_get_chanctx(link);
1594 if (old_ctx) {
1595 if (old_ctx->replace_state ==
1596 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1597 n_vifs_switch++;
1598 else
1599 n_vifs_assign++;
1600 } else {
1601 n_vifs_ctxless++;
1602 }
1603
1604 if (link->reserved_radar_required)
1605 ctx->conf.radar_enabled = true;
1606 }
1607 }
1608
1609 if (WARN_ON(n_ctx == 0) ||
1610 WARN_ON(n_vifs_switch == 0 &&
1611 n_vifs_assign == 0 &&
1612 n_vifs_ctxless == 0) ||
1613 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1614 WARN_ON(!new_ctx && !local->use_chanctx)) {
1615 err = -EINVAL;
1616 goto err;
1617 }
1618
1619 /*
1620 * All necessary vifs are ready. Perform the switch now depending on
1621 * reservations and driver capabilities.
1622 */
1623
1624 if (local->use_chanctx) {
1625 if (n_vifs_switch > 0) {
1626 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1627 if (err)
1628 goto err;
1629 }
1630
1631 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1632 err = ieee80211_chsw_switch_ctxs(local);
1633 if (err)
1634 goto err;
1635 }
1636 } else {
1637 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1638 if (err)
1639 goto err;
1640 }
1641
1642 /*
1643 * Update all structures, values and pointers to point to new channel
1644 * context(s).
1645 */
1646 list_for_each_entry(ctx, &local->chanctx_list, list) {
1647 struct ieee80211_link_data *link, *link_tmp;
1648
1649 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1650 continue;
1651
1652 if (WARN_ON(!ctx->replace_ctx)) {
1653 err = -EINVAL;
1654 goto err;
1655 }
1656
1657 list_for_each_entry(link, &ctx->reserved_links,
1658 reserved_chanctx_list) {
1659 struct ieee80211_sub_if_data *sdata = link->sdata;
1660 struct ieee80211_bss_conf *link_conf = link->conf;
1661 u64 changed = 0;
1662
1663 if (!ieee80211_link_has_in_place_reservation(link))
1664 continue;
1665
1666 rcu_assign_pointer(link_conf->chanctx_conf,
1667 &ctx->conf);
1668
1669 if (sdata->vif.type == NL80211_IFTYPE_AP)
1670 __ieee80211_link_copy_chanctx_to_vlans(link,
1671 false);
1672
1673 ieee80211_check_fast_xmit_iface(sdata);
1674
1675 link->radar_required = link->reserved_radar_required;
1676
1677 if (link_conf->chandef.width != link->reserved_chandef.width)
1678 changed = BSS_CHANGED_BANDWIDTH;
1679
1680 ieee80211_link_update_chandef(link, &link->reserved_chandef);
1681 if (changed)
1682 ieee80211_link_info_change_notify(sdata,
1683 link,
1684 changed);
1685
1686 ieee80211_recalc_txpower(sdata, false);
1687 }
1688
1689 ieee80211_recalc_chanctx_chantype(local, ctx);
1690 ieee80211_recalc_smps_chanctx(local, ctx);
1691 ieee80211_recalc_radar_chanctx(local, ctx);
1692 ieee80211_recalc_chanctx_min_def(local, ctx, NULL);
1693
1694 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1695 reserved_chanctx_list) {
1696 if (ieee80211_link_get_chanctx(link) != ctx)
1697 continue;
1698
1699 list_del(&link->reserved_chanctx_list);
1700 list_move(&link->assigned_chanctx_list,
1701 &ctx->assigned_links);
1702 link->reserved_chanctx = NULL;
1703
1704 ieee80211_link_chanctx_reservation_complete(link);
1705 }
1706
1707 /*
1708 * This context might have been a dependency for an already
1709 * ready re-assign reservation interface that was deferred. Do
1710 * not propagate error to the caller though. The in-place
1711 * reservation for originally requested interface has already
1712 * succeeded at this point.
1713 */
1714 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1715 reserved_chanctx_list) {
1716 if (WARN_ON(ieee80211_link_has_in_place_reservation(link)))
1717 continue;
1718
1719 if (WARN_ON(link->reserved_chanctx != ctx))
1720 continue;
1721
1722 if (!link->reserved_ready)
1723 continue;
1724
1725 if (ieee80211_link_get_chanctx(link))
1726 err = ieee80211_link_use_reserved_reassign(link);
1727 else
1728 err = ieee80211_link_use_reserved_assign(link);
1729
1730 if (err) {
1731 link_info(link,
1732 "failed to finalize (re-)assign reservation (err=%d)\n",
1733 err);
1734 ieee80211_link_unreserve_chanctx(link);
1735 cfg80211_stop_iface(local->hw.wiphy,
1736 &link->sdata->wdev,
1737 GFP_KERNEL);
1738 }
1739 }
1740 }
1741
1742 /*
1743 * Finally free old contexts
1744 */
1745
1746 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1747 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1748 continue;
1749
1750 ctx->replace_ctx->replace_ctx = NULL;
1751 ctx->replace_ctx->replace_state =
1752 IEEE80211_CHANCTX_REPLACE_NONE;
1753
1754 list_del_rcu(&ctx->list);
1755 kfree_rcu(ctx, rcu_head);
1756 }
1757
1758 return 0;
1759
1760 err:
1761 list_for_each_entry(ctx, &local->chanctx_list, list) {
1762 struct ieee80211_link_data *link, *link_tmp;
1763
1764 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1765 continue;
1766
1767 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1768 reserved_chanctx_list) {
1769 ieee80211_link_unreserve_chanctx(link);
1770 ieee80211_link_chanctx_reservation_complete(link);
1771 }
1772 }
1773
1774 return err;
1775 }
1776
__ieee80211_link_release_channel(struct ieee80211_link_data * link)1777 static void __ieee80211_link_release_channel(struct ieee80211_link_data *link)
1778 {
1779 struct ieee80211_sub_if_data *sdata = link->sdata;
1780 struct ieee80211_bss_conf *link_conf = link->conf;
1781 struct ieee80211_local *local = sdata->local;
1782 struct ieee80211_chanctx_conf *conf;
1783 struct ieee80211_chanctx *ctx;
1784 bool use_reserved_switch = false;
1785
1786 lockdep_assert_held(&local->chanctx_mtx);
1787
1788 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1789 lockdep_is_held(&local->chanctx_mtx));
1790 if (!conf)
1791 return;
1792
1793 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1794
1795 if (link->reserved_chanctx) {
1796 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
1797 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1)
1798 use_reserved_switch = true;
1799
1800 ieee80211_link_unreserve_chanctx(link);
1801 }
1802
1803 ieee80211_assign_link_chanctx(link, NULL);
1804 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1805 ieee80211_free_chanctx(local, ctx);
1806
1807 link->radar_required = false;
1808
1809 /* Unreserving may ready an in-place reservation. */
1810 if (use_reserved_switch)
1811 ieee80211_vif_use_reserved_switch(local);
1812 }
1813
ieee80211_link_use_channel(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)1814 int ieee80211_link_use_channel(struct ieee80211_link_data *link,
1815 const struct cfg80211_chan_def *chandef,
1816 enum ieee80211_chanctx_mode mode)
1817 {
1818 struct ieee80211_sub_if_data *sdata = link->sdata;
1819 struct ieee80211_local *local = sdata->local;
1820 struct ieee80211_chanctx *ctx;
1821 u8 radar_detect_width = 0;
1822 int ret;
1823
1824 lockdep_assert_held(&local->mtx);
1825
1826 if (sdata->vif.active_links &&
1827 !(sdata->vif.active_links & BIT(link->link_id))) {
1828 ieee80211_link_update_chandef(link, chandef);
1829 return 0;
1830 }
1831
1832 mutex_lock(&local->chanctx_mtx);
1833
1834 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1835 chandef,
1836 sdata->wdev.iftype);
1837 if (ret < 0)
1838 goto out;
1839 if (ret > 0)
1840 radar_detect_width = BIT(chandef->width);
1841
1842 link->radar_required = ret;
1843
1844 ret = ieee80211_check_combinations(sdata, chandef, mode,
1845 radar_detect_width);
1846 if (ret < 0)
1847 goto out;
1848
1849 __ieee80211_link_release_channel(link);
1850
1851 ctx = ieee80211_find_chanctx(local, chandef, mode);
1852 if (!ctx)
1853 ctx = ieee80211_new_chanctx(local, chandef, mode);
1854 if (IS_ERR(ctx)) {
1855 ret = PTR_ERR(ctx);
1856 goto out;
1857 }
1858
1859 ieee80211_link_update_chandef(link, chandef);
1860
1861 ret = ieee80211_assign_link_chanctx(link, ctx);
1862 if (ret) {
1863 /* if assign fails refcount stays the same */
1864 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1865 ieee80211_free_chanctx(local, ctx);
1866 goto out;
1867 }
1868
1869 ieee80211_recalc_smps_chanctx(local, ctx);
1870 ieee80211_recalc_radar_chanctx(local, ctx);
1871 out:
1872 if (ret)
1873 link->radar_required = false;
1874
1875 mutex_unlock(&local->chanctx_mtx);
1876 return ret;
1877 }
1878
ieee80211_link_use_reserved_context(struct ieee80211_link_data * link)1879 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
1880 {
1881 struct ieee80211_sub_if_data *sdata = link->sdata;
1882 struct ieee80211_local *local = sdata->local;
1883 struct ieee80211_chanctx *new_ctx;
1884 struct ieee80211_chanctx *old_ctx;
1885 int err;
1886
1887 lockdep_assert_held(&local->mtx);
1888 lockdep_assert_held(&local->chanctx_mtx);
1889
1890 new_ctx = link->reserved_chanctx;
1891 old_ctx = ieee80211_link_get_chanctx(link);
1892
1893 if (WARN_ON(!new_ctx))
1894 return -EINVAL;
1895
1896 if (WARN_ON(new_ctx->replace_state ==
1897 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1898 return -EINVAL;
1899
1900 if (WARN_ON(link->reserved_ready))
1901 return -EINVAL;
1902
1903 link->reserved_ready = true;
1904
1905 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1906 if (old_ctx)
1907 return ieee80211_link_use_reserved_reassign(link);
1908
1909 return ieee80211_link_use_reserved_assign(link);
1910 }
1911
1912 /*
1913 * In-place reservation may need to be finalized now either if:
1914 * a) sdata is taking part in the swapping itself and is the last one
1915 * b) sdata has switched with a re-assign reservation to an existing
1916 * context readying in-place switching of old_ctx
1917 *
1918 * In case of (b) do not propagate the error up because the requested
1919 * sdata already switched successfully. Just spill an extra warning.
1920 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1921 * interfaces upon failure.
1922 */
1923 if ((old_ctx &&
1924 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1925 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1926 err = ieee80211_vif_use_reserved_switch(local);
1927 if (err && err != -EAGAIN) {
1928 if (new_ctx->replace_state ==
1929 IEEE80211_CHANCTX_REPLACES_OTHER)
1930 return err;
1931
1932 wiphy_info(local->hw.wiphy,
1933 "depending in-place reservation failed (err=%d)\n",
1934 err);
1935 }
1936 }
1937
1938 return 0;
1939 }
1940
ieee80211_link_change_bandwidth(struct ieee80211_link_data * link,const struct cfg80211_chan_def * chandef,u64 * changed)1941 int ieee80211_link_change_bandwidth(struct ieee80211_link_data *link,
1942 const struct cfg80211_chan_def *chandef,
1943 u64 *changed)
1944 {
1945 struct ieee80211_sub_if_data *sdata = link->sdata;
1946 struct ieee80211_bss_conf *link_conf = link->conf;
1947 struct ieee80211_local *local = sdata->local;
1948 struct ieee80211_chanctx_conf *conf;
1949 struct ieee80211_chanctx *ctx;
1950 const struct cfg80211_chan_def *compat;
1951 int ret;
1952
1953 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1954 IEEE80211_CHAN_DISABLED))
1955 return -EINVAL;
1956
1957 mutex_lock(&local->chanctx_mtx);
1958 if (cfg80211_chandef_identical(chandef, &link_conf->chandef)) {
1959 ret = 0;
1960 goto out;
1961 }
1962
1963 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1964 link_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1965 ret = -EINVAL;
1966 goto out;
1967 }
1968
1969 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1970 lockdep_is_held(&local->chanctx_mtx));
1971 if (!conf) {
1972 ret = -EINVAL;
1973 goto out;
1974 }
1975
1976 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1977
1978 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1979 if (!compat) {
1980 ret = -EINVAL;
1981 goto out;
1982 }
1983
1984 switch (ctx->replace_state) {
1985 case IEEE80211_CHANCTX_REPLACE_NONE:
1986 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1987 ret = -EBUSY;
1988 goto out;
1989 }
1990 break;
1991 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1992 /* TODO: Perhaps the bandwidth change could be treated as a
1993 * reservation itself? */
1994 ret = -EBUSY;
1995 goto out;
1996 case IEEE80211_CHANCTX_REPLACES_OTHER:
1997 /* channel context that is going to replace another channel
1998 * context doesn't really exist and shouldn't be assigned
1999 * anywhere yet */
2000 WARN_ON(1);
2001 break;
2002 }
2003
2004 ieee80211_link_update_chandef(link, chandef);
2005
2006 ieee80211_recalc_chanctx_chantype(local, ctx);
2007
2008 *changed |= BSS_CHANGED_BANDWIDTH;
2009 ret = 0;
2010 out:
2011 mutex_unlock(&local->chanctx_mtx);
2012 return ret;
2013 }
2014
ieee80211_link_release_channel(struct ieee80211_link_data * link)2015 void ieee80211_link_release_channel(struct ieee80211_link_data *link)
2016 {
2017 struct ieee80211_sub_if_data *sdata = link->sdata;
2018
2019 mutex_lock(&sdata->local->chanctx_mtx);
2020 if (rcu_access_pointer(link->conf->chanctx_conf)) {
2021 lockdep_assert_held(&sdata->local->mtx);
2022 __ieee80211_link_release_channel(link);
2023 }
2024 mutex_unlock(&sdata->local->chanctx_mtx);
2025 }
2026
ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data * link)2027 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link)
2028 {
2029 struct ieee80211_sub_if_data *sdata = link->sdata;
2030 unsigned int link_id = link->link_id;
2031 struct ieee80211_bss_conf *link_conf = link->conf;
2032 struct ieee80211_bss_conf *ap_conf;
2033 struct ieee80211_local *local = sdata->local;
2034 struct ieee80211_sub_if_data *ap;
2035 struct ieee80211_chanctx_conf *conf;
2036
2037 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
2038 return;
2039
2040 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
2041
2042 mutex_lock(&local->chanctx_mtx);
2043
2044 rcu_read_lock();
2045 ap_conf = rcu_dereference(ap->vif.link_conf[link_id]);
2046 conf = rcu_dereference_protected(ap_conf->chanctx_conf,
2047 lockdep_is_held(&local->chanctx_mtx));
2048 rcu_assign_pointer(link_conf->chanctx_conf, conf);
2049 rcu_read_unlock();
2050 mutex_unlock(&local->chanctx_mtx);
2051 }
2052
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)2053 void ieee80211_iter_chan_contexts_atomic(
2054 struct ieee80211_hw *hw,
2055 void (*iter)(struct ieee80211_hw *hw,
2056 struct ieee80211_chanctx_conf *chanctx_conf,
2057 void *data),
2058 void *iter_data)
2059 {
2060 struct ieee80211_local *local = hw_to_local(hw);
2061 struct ieee80211_chanctx *ctx;
2062
2063 rcu_read_lock();
2064 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
2065 if (ctx->driver_present)
2066 iter(hw, &ctx->conf, iter_data);
2067 rcu_read_unlock();
2068 }
2069 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
2070