1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mac80211 - channel management
4 * Copyright 2020 - 2024 Intel Corporation
5 */
6
7 #include <linux/nl80211.h>
8 #include <linux/export.h>
9 #include <linux/rtnetlink.h>
10 #include <net/cfg80211.h>
11 #include "ieee80211_i.h"
12 #include "driver-ops.h"
13 #include "rate.h"
14
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,int radio_idx)50 static int ieee80211_num_chanctx(struct ieee80211_local *local, int radio_idx)
51 {
52 struct ieee80211_chanctx *ctx;
53 int num = 0;
54
55 lockdep_assert_wiphy(local->hw.wiphy);
56
57 list_for_each_entry(ctx, &local->chanctx_list, list) {
58 if (radio_idx >= 0 && ctx->conf.radio_idx != radio_idx)
59 continue;
60 num++;
61 }
62
63 return num;
64 }
65
ieee80211_can_create_new_chanctx(struct ieee80211_local * local,int radio_idx)66 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local,
67 int radio_idx)
68 {
69 lockdep_assert_wiphy(local->hw.wiphy);
70
71 return ieee80211_num_chanctx(local, radio_idx) <
72 ieee80211_max_num_channels(local, radio_idx);
73 }
74
75 static struct ieee80211_chanctx *
ieee80211_link_get_chanctx(struct ieee80211_link_data * link)76 ieee80211_link_get_chanctx(struct ieee80211_link_data *link)
77 {
78 struct ieee80211_local *local __maybe_unused = link->sdata->local;
79 struct ieee80211_chanctx_conf *conf;
80
81 conf = rcu_dereference_protected(link->conf->chanctx_conf,
82 lockdep_is_held(&local->hw.wiphy->mtx));
83 if (!conf)
84 return NULL;
85
86 return container_of(conf, struct ieee80211_chanctx, conf);
87 }
88
ieee80211_chanreq_identical(const struct ieee80211_chan_req * a,const struct ieee80211_chan_req * b)89 bool ieee80211_chanreq_identical(const struct ieee80211_chan_req *a,
90 const struct ieee80211_chan_req *b)
91 {
92 if (!cfg80211_chandef_identical(&a->oper, &b->oper))
93 return false;
94 if (!a->ap.chan && !b->ap.chan)
95 return true;
96 return cfg80211_chandef_identical(&a->ap, &b->ap);
97 }
98
99 static const struct ieee80211_chan_req *
ieee80211_chanreq_compatible(const struct ieee80211_chan_req * a,const struct ieee80211_chan_req * b,struct ieee80211_chan_req * tmp)100 ieee80211_chanreq_compatible(const struct ieee80211_chan_req *a,
101 const struct ieee80211_chan_req *b,
102 struct ieee80211_chan_req *tmp)
103 {
104 const struct cfg80211_chan_def *compat;
105
106 if (a->ap.chan && b->ap.chan &&
107 !cfg80211_chandef_identical(&a->ap, &b->ap))
108 return NULL;
109
110 compat = cfg80211_chandef_compatible(&a->oper, &b->oper);
111 if (!compat)
112 return NULL;
113
114 /* Note: later code assumes this always fills & returns tmp if compat */
115 tmp->oper = *compat;
116 tmp->ap = a->ap.chan ? a->ap : b->ap;
117 return tmp;
118 }
119
120 static const struct ieee80211_chan_req *
ieee80211_chanctx_compatible(struct ieee80211_chanctx * ctx,const struct ieee80211_chan_req * req,struct ieee80211_chan_req * tmp)121 ieee80211_chanctx_compatible(struct ieee80211_chanctx *ctx,
122 const struct ieee80211_chan_req *req,
123 struct ieee80211_chan_req *tmp)
124 {
125 const struct ieee80211_chan_req *ret;
126 struct ieee80211_chan_req tmp2;
127
128 *tmp = (struct ieee80211_chan_req){
129 .oper = ctx->conf.def,
130 .ap = ctx->conf.ap,
131 };
132
133 ret = ieee80211_chanreq_compatible(tmp, req, &tmp2);
134 if (!ret)
135 return NULL;
136 *tmp = *ret;
137 return tmp;
138 }
139
140 static const struct ieee80211_chan_req *
ieee80211_chanctx_reserved_chanreq(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct ieee80211_chan_req * req,struct ieee80211_chan_req * tmp)141 ieee80211_chanctx_reserved_chanreq(struct ieee80211_local *local,
142 struct ieee80211_chanctx *ctx,
143 const struct ieee80211_chan_req *req,
144 struct ieee80211_chan_req *tmp)
145 {
146 struct ieee80211_link_data *link;
147
148 lockdep_assert_wiphy(local->hw.wiphy);
149
150 if (WARN_ON(!req))
151 return NULL;
152
153 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) {
154 req = ieee80211_chanreq_compatible(&link->reserved, req, tmp);
155 if (!req)
156 break;
157 }
158
159 return req;
160 }
161
162 static const struct ieee80211_chan_req *
ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct ieee80211_chan_req * compat,struct ieee80211_chan_req * tmp)163 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
164 struct ieee80211_chanctx *ctx,
165 const struct ieee80211_chan_req *compat,
166 struct ieee80211_chan_req *tmp)
167 {
168 struct ieee80211_link_data *link;
169 const struct ieee80211_chan_req *comp_def = compat;
170
171 lockdep_assert_wiphy(local->hw.wiphy);
172
173 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) {
174 struct ieee80211_bss_conf *link_conf = link->conf;
175
176 if (link->reserved_chanctx)
177 continue;
178
179 comp_def = ieee80211_chanreq_compatible(&link_conf->chanreq,
180 comp_def, tmp);
181 if (!comp_def)
182 break;
183 }
184
185 return comp_def;
186 }
187
188 static bool
ieee80211_chanctx_can_reserve(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct ieee80211_chan_req * req)189 ieee80211_chanctx_can_reserve(struct ieee80211_local *local,
190 struct ieee80211_chanctx *ctx,
191 const struct ieee80211_chan_req *req)
192 {
193 struct ieee80211_chan_req tmp;
194
195 lockdep_assert_wiphy(local->hw.wiphy);
196
197 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp))
198 return false;
199
200 if (!ieee80211_chanctx_non_reserved_chandef(local, ctx, req, &tmp))
201 return false;
202
203 if (!list_empty(&ctx->reserved_links) &&
204 ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp))
205 return true;
206
207 return false;
208 }
209
210 static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local * local,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode)211 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
212 const struct ieee80211_chan_req *chanreq,
213 enum ieee80211_chanctx_mode mode)
214 {
215 struct ieee80211_chanctx *ctx;
216
217 lockdep_assert_wiphy(local->hw.wiphy);
218
219 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
220 return NULL;
221
222 list_for_each_entry(ctx, &local->chanctx_list, list) {
223 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
224 continue;
225
226 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
227 continue;
228
229 if (!ieee80211_chanctx_can_reserve(local, ctx, chanreq))
230 continue;
231
232 return ctx;
233 }
234
235 return NULL;
236 }
237
ieee80211_get_sta_bw(struct sta_info * sta,unsigned int link_id)238 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta,
239 unsigned int link_id)
240 {
241 enum ieee80211_sta_rx_bandwidth width;
242 struct link_sta_info *link_sta;
243
244 link_sta = wiphy_dereference(sta->local->hw.wiphy, sta->link[link_id]);
245
246 /* no effect if this STA has no presence on this link */
247 if (!link_sta)
248 return NL80211_CHAN_WIDTH_20_NOHT;
249
250 width = ieee80211_sta_cap_rx_bw(link_sta);
251
252 switch (width) {
253 case IEEE80211_STA_RX_BW_20:
254 if (link_sta->pub->ht_cap.ht_supported)
255 return NL80211_CHAN_WIDTH_20;
256 else
257 return NL80211_CHAN_WIDTH_20_NOHT;
258 case IEEE80211_STA_RX_BW_40:
259 return NL80211_CHAN_WIDTH_40;
260 case IEEE80211_STA_RX_BW_80:
261 return NL80211_CHAN_WIDTH_80;
262 case IEEE80211_STA_RX_BW_160:
263 /*
264 * This applied for both 160 and 80+80. since we use
265 * the returned value to consider degradation of
266 * ctx->conf.min_def, we have to make sure to take
267 * the bigger one (NL80211_CHAN_WIDTH_160).
268 * Otherwise we might try degrading even when not
269 * needed, as the max required sta_bw returned (80+80)
270 * might be smaller than the configured bw (160).
271 */
272 return NL80211_CHAN_WIDTH_160;
273 case IEEE80211_STA_RX_BW_320:
274 return NL80211_CHAN_WIDTH_320;
275 default:
276 WARN_ON(1);
277 return NL80211_CHAN_WIDTH_20;
278 }
279 }
280
281 static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_link_data * link)282 ieee80211_get_max_required_bw(struct ieee80211_link_data *link)
283 {
284 struct ieee80211_sub_if_data *sdata = link->sdata;
285 unsigned int link_id = link->link_id;
286 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
287 struct sta_info *sta;
288
289 lockdep_assert_wiphy(sdata->local->hw.wiphy);
290
291 list_for_each_entry(sta, &sdata->local->sta_list, list) {
292 if (sdata != sta->sdata &&
293 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
294 continue;
295
296 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id));
297 }
298
299 return max_bw;
300 }
301
302 static enum nl80211_chan_width
ieee80211_get_chanctx_max_required_bw(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for,bool check_reserved)303 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
304 struct ieee80211_chanctx *ctx,
305 struct ieee80211_link_data *rsvd_for,
306 bool check_reserved)
307 {
308 struct ieee80211_sub_if_data *sdata;
309 struct ieee80211_link_data *link;
310 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
311
312 if (WARN_ON(check_reserved && rsvd_for))
313 return ctx->conf.def.width;
314
315 for_each_sdata_link(local, link) {
316 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
317
318 if (check_reserved) {
319 if (link->reserved_chanctx != ctx)
320 continue;
321 } else if (link != rsvd_for &&
322 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf)
323 continue;
324
325 switch (link->sdata->vif.type) {
326 case NL80211_IFTYPE_AP:
327 case NL80211_IFTYPE_AP_VLAN:
328 width = ieee80211_get_max_required_bw(link);
329 break;
330 case NL80211_IFTYPE_STATION:
331 /*
332 * The ap's sta->bandwidth is not set yet at this
333 * point, so take the width from the chandef, but
334 * account also for TDLS peers
335 */
336 width = max(link->conf->chanreq.oper.width,
337 ieee80211_get_max_required_bw(link));
338 break;
339 case NL80211_IFTYPE_P2P_DEVICE:
340 case NL80211_IFTYPE_NAN:
341 continue;
342 case NL80211_IFTYPE_ADHOC:
343 case NL80211_IFTYPE_MESH_POINT:
344 case NL80211_IFTYPE_OCB:
345 width = link->conf->chanreq.oper.width;
346 break;
347 case NL80211_IFTYPE_WDS:
348 case NL80211_IFTYPE_UNSPECIFIED:
349 case NUM_NL80211_IFTYPES:
350 case NL80211_IFTYPE_MONITOR:
351 case NL80211_IFTYPE_P2P_CLIENT:
352 case NL80211_IFTYPE_P2P_GO:
353 WARN_ON_ONCE(1);
354 }
355
356 max_bw = max(max_bw, width);
357 }
358
359 /* use the configured bandwidth in case of monitor interface */
360 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
361 if (sdata &&
362 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf)
363 max_bw = max(max_bw, ctx->conf.def.width);
364
365 return max_bw;
366 }
367
368 /*
369 * recalc the min required chan width of the channel context, which is
370 * the max of min required widths of all the interfaces bound to this
371 * channel context.
372 */
373 static u32
_ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for,bool check_reserved)374 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
375 struct ieee80211_chanctx *ctx,
376 struct ieee80211_link_data *rsvd_for,
377 bool check_reserved)
378 {
379 enum nl80211_chan_width max_bw;
380 struct cfg80211_chan_def min_def;
381
382 lockdep_assert_wiphy(local->hw.wiphy);
383
384 /* don't optimize non-20MHz based and radar_enabled confs */
385 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
386 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
387 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
388 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
389 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
390 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
391 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
392 ctx->conf.radar_enabled) {
393 ctx->conf.min_def = ctx->conf.def;
394 return 0;
395 }
396
397 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for,
398 check_reserved);
399
400 /* downgrade chandef up to max_bw */
401 min_def = ctx->conf.def;
402 while (min_def.width > max_bw)
403 ieee80211_chandef_downgrade(&min_def, NULL);
404
405 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
406 return 0;
407
408 ctx->conf.min_def = min_def;
409 if (!ctx->driver_present)
410 return 0;
411
412 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
413 }
414
ieee80211_chan_bw_change(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool reserved,bool narrowed)415 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
416 struct ieee80211_chanctx *ctx,
417 bool reserved, bool narrowed)
418 {
419 struct sta_info *sta;
420 struct ieee80211_supported_band *sband =
421 local->hw.wiphy->bands[ctx->conf.def.chan->band];
422
423 rcu_read_lock();
424 list_for_each_entry_rcu(sta, &local->sta_list,
425 list) {
426 struct ieee80211_sub_if_data *sdata = sta->sdata;
427 enum ieee80211_sta_rx_bandwidth new_sta_bw;
428 unsigned int link_id;
429
430 if (!ieee80211_sdata_running(sta->sdata))
431 continue;
432
433 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
434 struct ieee80211_link_data *link =
435 rcu_dereference(sdata->link[link_id]);
436 struct ieee80211_bss_conf *link_conf;
437 struct cfg80211_chan_def *new_chandef;
438 struct link_sta_info *link_sta;
439
440 if (!link)
441 continue;
442
443 link_conf = link->conf;
444
445 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf)
446 continue;
447
448 link_sta = rcu_dereference(sta->link[link_id]);
449 if (!link_sta)
450 continue;
451
452 if (reserved)
453 new_chandef = &link->reserved.oper;
454 else
455 new_chandef = &link_conf->chanreq.oper;
456
457 new_sta_bw = _ieee80211_sta_cur_vht_bw(link_sta,
458 new_chandef);
459
460 /* nothing change */
461 if (new_sta_bw == link_sta->pub->bandwidth)
462 continue;
463
464 /* vif changed to narrow BW and narrow BW for station wasn't
465 * requested or vise versa */
466 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed)
467 continue;
468
469 link_sta->pub->bandwidth = new_sta_bw;
470 rate_control_rate_update(local, sband, sta, link_id,
471 IEEE80211_RC_BW_CHANGED);
472 }
473 }
474 rcu_read_unlock();
475 }
476
477 /*
478 * recalc the min required chan width of the channel context, which is
479 * the max of min required widths of all the interfaces bound to this
480 * channel context.
481 */
ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_link_data * rsvd_for,bool check_reserved)482 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
483 struct ieee80211_chanctx *ctx,
484 struct ieee80211_link_data *rsvd_for,
485 bool check_reserved)
486 {
487 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for,
488 check_reserved);
489
490 if (!changed)
491 return;
492
493 /* check is BW narrowed */
494 ieee80211_chan_bw_change(local, ctx, false, true);
495
496 drv_change_chanctx(local, ctx, changed);
497
498 /* check is BW wider */
499 ieee80211_chan_bw_change(local, ctx, false, false);
500 }
501
_ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct ieee80211_chan_req * chanreq,struct ieee80211_link_data * rsvd_for)502 static void _ieee80211_change_chanctx(struct ieee80211_local *local,
503 struct ieee80211_chanctx *ctx,
504 struct ieee80211_chanctx *old_ctx,
505 const struct ieee80211_chan_req *chanreq,
506 struct ieee80211_link_data *rsvd_for)
507 {
508 const struct cfg80211_chan_def *chandef = &chanreq->oper;
509 struct ieee80211_chan_req ctx_req = {
510 .oper = ctx->conf.def,
511 .ap = ctx->conf.ap,
512 };
513 u32 changed = 0;
514
515 /* expected to handle only 20/40/80/160/320 channel widths */
516 switch (chandef->width) {
517 case NL80211_CHAN_WIDTH_20_NOHT:
518 case NL80211_CHAN_WIDTH_20:
519 case NL80211_CHAN_WIDTH_40:
520 case NL80211_CHAN_WIDTH_80:
521 case NL80211_CHAN_WIDTH_80P80:
522 case NL80211_CHAN_WIDTH_160:
523 case NL80211_CHAN_WIDTH_320:
524 break;
525 default:
526 WARN_ON(1);
527 }
528
529 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
530 * due to maybe not returning from it, e.g in case new context was added
531 * first time with all parameters up to date.
532 */
533 ieee80211_chan_bw_change(local, old_ctx, false, true);
534
535 if (ieee80211_chanreq_identical(&ctx_req, chanreq)) {
536 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false);
537 return;
538 }
539
540 WARN_ON(ieee80211_chanctx_refcount(local, ctx) > 1 &&
541 !cfg80211_chandef_compatible(&ctx->conf.def, &chanreq->oper));
542
543 ieee80211_remove_wbrf(local, &ctx->conf.def);
544
545 if (!cfg80211_chandef_identical(&ctx->conf.def, &chanreq->oper)) {
546 if (ctx->conf.def.width != chanreq->oper.width)
547 changed |= IEEE80211_CHANCTX_CHANGE_WIDTH;
548 if (ctx->conf.def.punctured != chanreq->oper.punctured)
549 changed |= IEEE80211_CHANCTX_CHANGE_PUNCTURING;
550 }
551 if (!cfg80211_chandef_identical(&ctx->conf.ap, &chanreq->ap))
552 changed |= IEEE80211_CHANCTX_CHANGE_AP;
553 ctx->conf.def = *chandef;
554 ctx->conf.ap = chanreq->ap;
555
556 /* check if min chanctx also changed */
557 changed |= _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false);
558
559 ieee80211_add_wbrf(local, &ctx->conf.def);
560
561 drv_change_chanctx(local, ctx, changed);
562
563 /* check if BW is wider */
564 ieee80211_chan_bw_change(local, old_ctx, false, false);
565 }
566
ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct ieee80211_chan_req * chanreq)567 static void ieee80211_change_chanctx(struct ieee80211_local *local,
568 struct ieee80211_chanctx *ctx,
569 struct ieee80211_chanctx *old_ctx,
570 const struct ieee80211_chan_req *chanreq)
571 {
572 _ieee80211_change_chanctx(local, ctx, old_ctx, chanreq, NULL);
573 }
574
575 /* Note: if successful, the returned chanctx is reserved for the link */
576 static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local * local,struct ieee80211_link_data * link,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode)577 ieee80211_find_chanctx(struct ieee80211_local *local,
578 struct ieee80211_link_data *link,
579 const struct ieee80211_chan_req *chanreq,
580 enum ieee80211_chanctx_mode mode)
581 {
582 struct ieee80211_chan_req tmp;
583 struct ieee80211_chanctx *ctx;
584
585 lockdep_assert_wiphy(local->hw.wiphy);
586
587 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
588 return NULL;
589
590 if (WARN_ON(link->reserved_chanctx))
591 return NULL;
592
593 list_for_each_entry(ctx, &local->chanctx_list, list) {
594 const struct ieee80211_chan_req *compat;
595
596 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
597 continue;
598
599 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
600 continue;
601
602 compat = ieee80211_chanctx_compatible(ctx, chanreq, &tmp);
603 if (!compat)
604 continue;
605
606 compat = ieee80211_chanctx_reserved_chanreq(local, ctx,
607 compat, &tmp);
608 if (!compat)
609 continue;
610
611 /*
612 * Reserve the chanctx temporarily, as the driver might change
613 * active links during callbacks we make into it below and/or
614 * later during assignment, which could (otherwise) cause the
615 * context to actually be removed.
616 */
617 link->reserved_chanctx = ctx;
618 list_add(&link->reserved_chanctx_list,
619 &ctx->reserved_links);
620
621 ieee80211_change_chanctx(local, ctx, ctx, compat);
622
623 return ctx;
624 }
625
626 return NULL;
627 }
628
ieee80211_is_radar_required(struct ieee80211_local * local)629 bool ieee80211_is_radar_required(struct ieee80211_local *local)
630 {
631 struct ieee80211_link_data *link;
632
633 lockdep_assert_wiphy(local->hw.wiphy);
634
635 for_each_sdata_link(local, link) {
636 if (link->radar_required)
637 return true;
638 }
639
640 return false;
641 }
642
643 static bool
ieee80211_chanctx_radar_required(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)644 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
645 struct ieee80211_chanctx *ctx)
646 {
647 struct ieee80211_chanctx_conf *conf = &ctx->conf;
648 struct ieee80211_link_data *link;
649
650 lockdep_assert_wiphy(local->hw.wiphy);
651
652 for_each_sdata_link(local, link) {
653 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
654 continue;
655 if (!link->radar_required)
656 continue;
657 return true;
658 }
659
660 return false;
661 }
662
663 static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local * local,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode,int radio_idx)664 ieee80211_alloc_chanctx(struct ieee80211_local *local,
665 const struct ieee80211_chan_req *chanreq,
666 enum ieee80211_chanctx_mode mode,
667 int radio_idx)
668 {
669 struct ieee80211_chanctx *ctx;
670
671 lockdep_assert_wiphy(local->hw.wiphy);
672
673 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
674 if (!ctx)
675 return NULL;
676
677 INIT_LIST_HEAD(&ctx->assigned_links);
678 INIT_LIST_HEAD(&ctx->reserved_links);
679 ctx->conf.def = chanreq->oper;
680 ctx->conf.ap = chanreq->ap;
681 ctx->conf.rx_chains_static = 1;
682 ctx->conf.rx_chains_dynamic = 1;
683 ctx->mode = mode;
684 ctx->conf.radar_enabled = false;
685 ctx->conf.radio_idx = radio_idx;
686 ctx->radar_detected = false;
687 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false);
688
689 return ctx;
690 }
691
ieee80211_add_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)692 static int ieee80211_add_chanctx(struct ieee80211_local *local,
693 struct ieee80211_chanctx *ctx)
694 {
695 u32 changed;
696 int err;
697
698 lockdep_assert_wiphy(local->hw.wiphy);
699
700 ieee80211_add_wbrf(local, &ctx->conf.def);
701
702 /* turn idle off *before* setting channel -- some drivers need that */
703 changed = ieee80211_idle_off(local);
704 if (changed)
705 ieee80211_hw_config(local, changed);
706
707 err = drv_add_chanctx(local, ctx);
708 if (err) {
709 ieee80211_recalc_idle(local);
710 return err;
711 }
712
713 return 0;
714 }
715
716 static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local * local,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode,bool assign_on_failure,int radio_idx)717 ieee80211_new_chanctx(struct ieee80211_local *local,
718 const struct ieee80211_chan_req *chanreq,
719 enum ieee80211_chanctx_mode mode,
720 bool assign_on_failure,
721 int radio_idx)
722 {
723 struct ieee80211_chanctx *ctx;
724 int err;
725
726 lockdep_assert_wiphy(local->hw.wiphy);
727
728 ctx = ieee80211_alloc_chanctx(local, chanreq, mode, radio_idx);
729 if (!ctx)
730 return ERR_PTR(-ENOMEM);
731
732 err = ieee80211_add_chanctx(local, ctx);
733 if (!assign_on_failure && err) {
734 kfree(ctx);
735 return ERR_PTR(err);
736 }
737 /* We ignored a driver error, see _ieee80211_set_active_links */
738 WARN_ON_ONCE(err && !local->in_reconfig);
739
740 list_add_rcu(&ctx->list, &local->chanctx_list);
741 return ctx;
742 }
743
ieee80211_del_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool skip_idle_recalc)744 static void ieee80211_del_chanctx(struct ieee80211_local *local,
745 struct ieee80211_chanctx *ctx,
746 bool skip_idle_recalc)
747 {
748 lockdep_assert_wiphy(local->hw.wiphy);
749
750 drv_remove_chanctx(local, ctx);
751
752 if (!skip_idle_recalc)
753 ieee80211_recalc_idle(local);
754
755 ieee80211_remove_wbrf(local, &ctx->conf.def);
756 }
757
ieee80211_free_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool skip_idle_recalc)758 static void ieee80211_free_chanctx(struct ieee80211_local *local,
759 struct ieee80211_chanctx *ctx,
760 bool skip_idle_recalc)
761 {
762 lockdep_assert_wiphy(local->hw.wiphy);
763
764 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
765
766 list_del_rcu(&ctx->list);
767 ieee80211_del_chanctx(local, ctx, skip_idle_recalc);
768 kfree_rcu(ctx, rcu_head);
769 }
770
ieee80211_recalc_chanctx_chantype(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)771 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
772 struct ieee80211_chanctx *ctx)
773 {
774 struct ieee80211_chanctx_conf *conf = &ctx->conf;
775 const struct ieee80211_chan_req *compat = NULL;
776 struct ieee80211_link_data *link;
777 struct ieee80211_chan_req tmp;
778 struct sta_info *sta;
779
780 lockdep_assert_wiphy(local->hw.wiphy);
781
782 for_each_sdata_link(local, link) {
783 struct ieee80211_bss_conf *link_conf;
784
785 if (link->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
786 continue;
787
788 link_conf = link->conf;
789
790 if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
791 continue;
792
793 if (!compat)
794 compat = &link_conf->chanreq;
795
796 compat = ieee80211_chanreq_compatible(&link_conf->chanreq,
797 compat, &tmp);
798 if (WARN_ON_ONCE(!compat))
799 return;
800 }
801
802 if (WARN_ON_ONCE(!compat))
803 return;
804
805 /* TDLS peers can sometimes affect the chandef width */
806 list_for_each_entry(sta, &local->sta_list, list) {
807 struct ieee80211_sub_if_data *sdata = sta->sdata;
808 struct ieee80211_chan_req tdls_chanreq = {};
809 int tdls_link_id;
810
811 if (!sta->uploaded ||
812 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
813 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
814 !sta->tdls_chandef.chan)
815 continue;
816
817 tdls_link_id = ieee80211_tdls_sta_link_id(sta);
818 link = sdata_dereference(sdata->link[tdls_link_id], sdata);
819 if (!link)
820 continue;
821
822 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
823 continue;
824
825 tdls_chanreq.oper = sta->tdls_chandef;
826
827 /* note this always fills and returns &tmp if compat */
828 compat = ieee80211_chanreq_compatible(&tdls_chanreq,
829 compat, &tmp);
830 if (WARN_ON_ONCE(!compat))
831 return;
832 }
833
834 ieee80211_change_chanctx(local, ctx, ctx, compat);
835 }
836
ieee80211_recalc_radar_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)837 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
838 struct ieee80211_chanctx *chanctx)
839 {
840 bool radar_enabled;
841
842 lockdep_assert_wiphy(local->hw.wiphy);
843
844 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
845
846 if (radar_enabled == chanctx->conf.radar_enabled)
847 return;
848
849 chanctx->conf.radar_enabled = radar_enabled;
850
851 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
852 }
853
ieee80211_assign_link_chanctx(struct ieee80211_link_data * link,struct ieee80211_chanctx * new_ctx,bool assign_on_failure)854 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
855 struct ieee80211_chanctx *new_ctx,
856 bool assign_on_failure)
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 bool new_idle;
863 int ret;
864
865 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
866 return -EOPNOTSUPP;
867
868 conf = rcu_dereference_protected(link->conf->chanctx_conf,
869 lockdep_is_held(&local->hw.wiphy->mtx));
870
871 if (conf) {
872 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
873
874 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx);
875 conf = NULL;
876 list_del(&link->assigned_chanctx_list);
877 }
878
879 if (new_ctx) {
880 /* recalc considering the link we'll use it for now */
881 ieee80211_recalc_chanctx_min_def(local, new_ctx, link, false);
882
883 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
884 if (assign_on_failure || !ret) {
885 /* Need to continue, see _ieee80211_set_active_links */
886 WARN_ON_ONCE(ret && !local->in_reconfig);
887 ret = 0;
888
889 /* succeeded, so commit it to the data structures */
890 conf = &new_ctx->conf;
891 list_add(&link->assigned_chanctx_list,
892 &new_ctx->assigned_links);
893 }
894 } else {
895 ret = 0;
896 }
897
898 rcu_assign_pointer(link->conf->chanctx_conf, conf);
899
900 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
901 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
902 ieee80211_recalc_smps_chanctx(local, curr_ctx);
903 ieee80211_recalc_radar_chanctx(local, curr_ctx);
904 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL, false);
905 }
906
907 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
908 ieee80211_recalc_txpower(sdata, false);
909 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false);
910 }
911
912 if (conf) {
913 new_idle = false;
914 } else {
915 struct ieee80211_link_data *tmp;
916
917 new_idle = true;
918 for_each_sdata_link(local, tmp) {
919 if (rcu_access_pointer(tmp->conf->chanctx_conf)) {
920 new_idle = false;
921 break;
922 }
923 }
924 }
925
926 if (new_idle != sdata->vif.cfg.idle) {
927 sdata->vif.cfg.idle = new_idle;
928
929 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
930 sdata->vif.type != NL80211_IFTYPE_MONITOR)
931 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE);
932 }
933
934 ieee80211_check_fast_xmit_iface(sdata);
935
936 return ret;
937 }
938
ieee80211_recalc_smps_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)939 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
940 struct ieee80211_chanctx *chanctx)
941 {
942 struct ieee80211_sub_if_data *sdata;
943 u8 rx_chains_static, rx_chains_dynamic;
944 struct ieee80211_link_data *link;
945
946 lockdep_assert_wiphy(local->hw.wiphy);
947
948 rx_chains_static = 1;
949 rx_chains_dynamic = 1;
950
951 for_each_sdata_link(local, link) {
952 u8 needed_static, needed_dynamic;
953
954 switch (link->sdata->vif.type) {
955 case NL80211_IFTYPE_STATION:
956 if (!link->sdata->u.mgd.associated)
957 continue;
958 break;
959 case NL80211_IFTYPE_AP:
960 case NL80211_IFTYPE_ADHOC:
961 case NL80211_IFTYPE_MESH_POINT:
962 case NL80211_IFTYPE_OCB:
963 break;
964 default:
965 continue;
966 }
967
968 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf)
969 continue;
970
971 switch (link->smps_mode) {
972 default:
973 WARN_ONCE(1, "Invalid SMPS mode %d\n",
974 link->smps_mode);
975 fallthrough;
976 case IEEE80211_SMPS_OFF:
977 needed_static = link->needed_rx_chains;
978 needed_dynamic = link->needed_rx_chains;
979 break;
980 case IEEE80211_SMPS_DYNAMIC:
981 needed_static = 1;
982 needed_dynamic = link->needed_rx_chains;
983 break;
984 case IEEE80211_SMPS_STATIC:
985 needed_static = 1;
986 needed_dynamic = 1;
987 break;
988 }
989
990 rx_chains_static = max(rx_chains_static, needed_static);
991 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
992 }
993
994 /* Disable SMPS for the monitor interface */
995 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
996 if (sdata &&
997 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
998 rx_chains_dynamic = rx_chains_static = local->rx_chains;
999
1000 if (rx_chains_static == chanctx->conf.rx_chains_static &&
1001 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
1002 return;
1003
1004 chanctx->conf.rx_chains_static = rx_chains_static;
1005 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
1006 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
1007 }
1008
1009 static void
__ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1010 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1011 bool clear)
1012 {
1013 struct ieee80211_sub_if_data *sdata = link->sdata;
1014 unsigned int link_id = link->link_id;
1015 struct ieee80211_bss_conf *link_conf = link->conf;
1016 struct ieee80211_local *local __maybe_unused = sdata->local;
1017 struct ieee80211_sub_if_data *vlan;
1018 struct ieee80211_chanctx_conf *conf;
1019
1020 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
1021 return;
1022
1023 lockdep_assert_wiphy(local->hw.wiphy);
1024
1025 /* Check that conf exists, even when clearing this function
1026 * must be called with the AP's channel context still there
1027 * as it would otherwise cause VLANs to have an invalid
1028 * channel context pointer for a while, possibly pointing
1029 * to a channel context that has already been freed.
1030 */
1031 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1032 lockdep_is_held(&local->hw.wiphy->mtx));
1033 WARN_ON(!conf);
1034
1035 if (clear)
1036 conf = NULL;
1037
1038 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1039 struct ieee80211_bss_conf *vlan_conf;
1040
1041 vlan_conf = wiphy_dereference(local->hw.wiphy,
1042 vlan->vif.link_conf[link_id]);
1043 if (WARN_ON(!vlan_conf))
1044 continue;
1045
1046 rcu_assign_pointer(vlan_conf->chanctx_conf, conf);
1047 }
1048 }
1049
ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data * link,bool clear)1050 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1051 bool clear)
1052 {
1053 struct ieee80211_local *local = link->sdata->local;
1054
1055 lockdep_assert_wiphy(local->hw.wiphy);
1056
1057 __ieee80211_link_copy_chanctx_to_vlans(link, clear);
1058 }
1059
ieee80211_link_unreserve_chanctx(struct ieee80211_link_data * link)1060 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
1061 {
1062 struct ieee80211_sub_if_data *sdata = link->sdata;
1063 struct ieee80211_chanctx *ctx = link->reserved_chanctx;
1064
1065 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1066
1067 if (WARN_ON(!ctx))
1068 return -EINVAL;
1069
1070 list_del(&link->reserved_chanctx_list);
1071 link->reserved_chanctx = NULL;
1072
1073 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
1074 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1075 if (WARN_ON(!ctx->replace_ctx))
1076 return -EINVAL;
1077
1078 WARN_ON(ctx->replace_ctx->replace_state !=
1079 IEEE80211_CHANCTX_WILL_BE_REPLACED);
1080 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
1081
1082 ctx->replace_ctx->replace_ctx = NULL;
1083 ctx->replace_ctx->replace_state =
1084 IEEE80211_CHANCTX_REPLACE_NONE;
1085
1086 list_del_rcu(&ctx->list);
1087 kfree_rcu(ctx, rcu_head);
1088 } else {
1089 ieee80211_free_chanctx(sdata->local, ctx, false);
1090 }
1091 }
1092
1093 return 0;
1094 }
1095
1096 static struct ieee80211_chanctx *
ieee80211_replace_chanctx(struct ieee80211_local * local,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode,struct ieee80211_chanctx * curr_ctx)1097 ieee80211_replace_chanctx(struct ieee80211_local *local,
1098 const struct ieee80211_chan_req *chanreq,
1099 enum ieee80211_chanctx_mode mode,
1100 struct ieee80211_chanctx *curr_ctx)
1101 {
1102 struct ieee80211_chanctx *new_ctx, *ctx;
1103 struct wiphy *wiphy = local->hw.wiphy;
1104 const struct wiphy_radio *radio;
1105
1106 if (!curr_ctx || (curr_ctx->replace_state ==
1107 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1108 !list_empty(&curr_ctx->reserved_links)) {
1109 /*
1110 * Another link already requested this context for a
1111 * reservation. Find another one hoping all links assigned
1112 * to it will also switch soon enough.
1113 *
1114 * TODO: This needs a little more work as some cases
1115 * (more than 2 chanctx capable devices) may fail which could
1116 * otherwise succeed provided some channel context juggling was
1117 * performed.
1118 *
1119 * Consider ctx1..3, link1..6, each ctx has 2 links. link1 and
1120 * link2 from ctx1 request new different chandefs starting 2
1121 * in-place reserations with ctx4 and ctx5 replacing ctx1 and
1122 * ctx2 respectively. Next link5 and link6 from ctx3 reserve
1123 * ctx4. If link3 and link4 remain on ctx2 as they are then this
1124 * fails unless `replace_ctx` from ctx5 is replaced with ctx3.
1125 */
1126 list_for_each_entry(ctx, &local->chanctx_list, list) {
1127 if (ctx->replace_state !=
1128 IEEE80211_CHANCTX_REPLACE_NONE)
1129 continue;
1130
1131 if (!list_empty(&ctx->reserved_links))
1132 continue;
1133
1134 if (ctx->conf.radio_idx >= 0) {
1135 radio = &wiphy->radio[ctx->conf.radio_idx];
1136 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper))
1137 continue;
1138 }
1139
1140 curr_ctx = ctx;
1141 break;
1142 }
1143 }
1144
1145 /*
1146 * If that's true then all available contexts already have reservations
1147 * and cannot be used.
1148 */
1149 if (!curr_ctx || (curr_ctx->replace_state ==
1150 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1151 !list_empty(&curr_ctx->reserved_links))
1152 return ERR_PTR(-EBUSY);
1153
1154 new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
1155 if (!new_ctx)
1156 return ERR_PTR(-ENOMEM);
1157
1158 new_ctx->replace_ctx = curr_ctx;
1159 new_ctx->replace_state = IEEE80211_CHANCTX_REPLACES_OTHER;
1160
1161 curr_ctx->replace_ctx = new_ctx;
1162 curr_ctx->replace_state = IEEE80211_CHANCTX_WILL_BE_REPLACED;
1163
1164 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1165
1166 return new_ctx;
1167 }
1168
1169 static bool
ieee80211_find_available_radio(struct ieee80211_local * local,const struct ieee80211_chan_req * chanreq,int * radio_idx)1170 ieee80211_find_available_radio(struct ieee80211_local *local,
1171 const struct ieee80211_chan_req *chanreq,
1172 int *radio_idx)
1173 {
1174 struct wiphy *wiphy = local->hw.wiphy;
1175 const struct wiphy_radio *radio;
1176 int i;
1177
1178 *radio_idx = -1;
1179 if (!wiphy->n_radio)
1180 return true;
1181
1182 for (i = 0; i < wiphy->n_radio; i++) {
1183 radio = &wiphy->radio[i];
1184 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper))
1185 continue;
1186
1187 if (!ieee80211_can_create_new_chanctx(local, i))
1188 continue;
1189
1190 *radio_idx = i;
1191 return true;
1192 }
1193
1194 return false;
1195 }
1196
ieee80211_link_reserve_chanctx(struct ieee80211_link_data * link,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode,bool radar_required)1197 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
1198 const struct ieee80211_chan_req *chanreq,
1199 enum ieee80211_chanctx_mode mode,
1200 bool radar_required)
1201 {
1202 struct ieee80211_sub_if_data *sdata = link->sdata;
1203 struct ieee80211_local *local = sdata->local;
1204 struct ieee80211_chanctx *new_ctx, *curr_ctx;
1205 int radio_idx;
1206
1207 lockdep_assert_wiphy(local->hw.wiphy);
1208
1209 curr_ctx = ieee80211_link_get_chanctx(link);
1210 if (curr_ctx && !local->ops->switch_vif_chanctx)
1211 return -EOPNOTSUPP;
1212
1213 new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
1214 if (!new_ctx) {
1215 if (ieee80211_can_create_new_chanctx(local, -1) &&
1216 ieee80211_find_available_radio(local, chanreq, &radio_idx))
1217 new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
1218 false, radio_idx);
1219 else
1220 new_ctx = ieee80211_replace_chanctx(local, chanreq,
1221 mode, curr_ctx);
1222 if (IS_ERR(new_ctx))
1223 return PTR_ERR(new_ctx);
1224 }
1225
1226 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
1227 link->reserved_chanctx = new_ctx;
1228 link->reserved = *chanreq;
1229 link->reserved_radar_required = radar_required;
1230 link->reserved_ready = false;
1231
1232 return 0;
1233 }
1234
1235 static void
ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data * link)1236 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link)
1237 {
1238 struct ieee80211_sub_if_data *sdata = link->sdata;
1239
1240 switch (sdata->vif.type) {
1241 case NL80211_IFTYPE_ADHOC:
1242 case NL80211_IFTYPE_AP:
1243 case NL80211_IFTYPE_MESH_POINT:
1244 case NL80211_IFTYPE_OCB:
1245 wiphy_work_queue(sdata->local->hw.wiphy,
1246 &link->csa.finalize_work);
1247 break;
1248 case NL80211_IFTYPE_STATION:
1249 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1250 &link->u.mgd.csa.switch_work, 0);
1251 break;
1252 case NL80211_IFTYPE_UNSPECIFIED:
1253 case NL80211_IFTYPE_AP_VLAN:
1254 case NL80211_IFTYPE_WDS:
1255 case NL80211_IFTYPE_MONITOR:
1256 case NL80211_IFTYPE_P2P_CLIENT:
1257 case NL80211_IFTYPE_P2P_GO:
1258 case NL80211_IFTYPE_P2P_DEVICE:
1259 case NL80211_IFTYPE_NAN:
1260 case NUM_NL80211_IFTYPES:
1261 WARN_ON(1);
1262 break;
1263 }
1264 }
1265
1266 static void
ieee80211_link_update_chanreq(struct ieee80211_link_data * link,const struct ieee80211_chan_req * chanreq)1267 ieee80211_link_update_chanreq(struct ieee80211_link_data *link,
1268 const struct ieee80211_chan_req *chanreq)
1269 {
1270 struct ieee80211_sub_if_data *sdata = link->sdata;
1271 unsigned int link_id = link->link_id;
1272 struct ieee80211_sub_if_data *vlan;
1273
1274 link->conf->chanreq = *chanreq;
1275
1276 if (sdata->vif.type != NL80211_IFTYPE_AP)
1277 return;
1278
1279 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1280 struct ieee80211_bss_conf *vlan_conf;
1281
1282 vlan_conf = wiphy_dereference(sdata->local->hw.wiphy,
1283 vlan->vif.link_conf[link_id]);
1284 if (WARN_ON(!vlan_conf))
1285 continue;
1286
1287 vlan_conf->chanreq = *chanreq;
1288 }
1289 }
1290
1291 static int
ieee80211_link_use_reserved_reassign(struct ieee80211_link_data * link)1292 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link)
1293 {
1294 struct ieee80211_sub_if_data *sdata = link->sdata;
1295 struct ieee80211_bss_conf *link_conf = link->conf;
1296 struct ieee80211_local *local = sdata->local;
1297 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1298 struct ieee80211_chanctx *old_ctx, *new_ctx;
1299 const struct ieee80211_chan_req *chanreq;
1300 struct ieee80211_chan_req tmp;
1301 u64 changed = 0;
1302 int err;
1303
1304 lockdep_assert_wiphy(local->hw.wiphy);
1305
1306 new_ctx = link->reserved_chanctx;
1307 old_ctx = ieee80211_link_get_chanctx(link);
1308
1309 if (WARN_ON(!link->reserved_ready))
1310 return -EBUSY;
1311
1312 if (WARN_ON(!new_ctx))
1313 return -EINVAL;
1314
1315 if (WARN_ON(!old_ctx))
1316 return -EINVAL;
1317
1318 if (WARN_ON(new_ctx->replace_state ==
1319 IEEE80211_CHANCTX_REPLACES_OTHER))
1320 return -EINVAL;
1321
1322 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1323 &link->reserved,
1324 &tmp);
1325 if (WARN_ON(!chanreq))
1326 return -EINVAL;
1327
1328 if (link_conf->chanreq.oper.width != link->reserved.oper.width)
1329 changed = BSS_CHANGED_BANDWIDTH;
1330
1331 ieee80211_link_update_chanreq(link, &link->reserved);
1332
1333 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chanreq, link);
1334
1335 vif_chsw[0].vif = &sdata->vif;
1336 vif_chsw[0].old_ctx = &old_ctx->conf;
1337 vif_chsw[0].new_ctx = &new_ctx->conf;
1338 vif_chsw[0].link_conf = link->conf;
1339
1340 list_del(&link->reserved_chanctx_list);
1341 link->reserved_chanctx = NULL;
1342
1343 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1344 CHANCTX_SWMODE_REASSIGN_VIF);
1345 if (err) {
1346 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1347 ieee80211_free_chanctx(local, new_ctx, false);
1348
1349 goto out;
1350 }
1351
1352 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links);
1353 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf);
1354
1355 if (sdata->vif.type == NL80211_IFTYPE_AP)
1356 __ieee80211_link_copy_chanctx_to_vlans(link, false);
1357
1358 ieee80211_check_fast_xmit_iface(sdata);
1359
1360 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1361 ieee80211_free_chanctx(local, old_ctx, false);
1362
1363 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false);
1364 ieee80211_recalc_smps_chanctx(local, new_ctx);
1365 ieee80211_recalc_radar_chanctx(local, new_ctx);
1366
1367 if (changed)
1368 ieee80211_link_info_change_notify(sdata, link, changed);
1369
1370 out:
1371 ieee80211_link_chanctx_reservation_complete(link);
1372 return err;
1373 }
1374
1375 static int
ieee80211_link_use_reserved_assign(struct ieee80211_link_data * link)1376 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
1377 {
1378 struct ieee80211_sub_if_data *sdata = link->sdata;
1379 struct ieee80211_local *local = sdata->local;
1380 struct ieee80211_chanctx *old_ctx, *new_ctx;
1381 const struct ieee80211_chan_req *chanreq;
1382 struct ieee80211_chan_req tmp;
1383 int err;
1384
1385 old_ctx = ieee80211_link_get_chanctx(link);
1386 new_ctx = link->reserved_chanctx;
1387
1388 if (WARN_ON(!link->reserved_ready))
1389 return -EINVAL;
1390
1391 if (WARN_ON(old_ctx))
1392 return -EINVAL;
1393
1394 if (WARN_ON(!new_ctx))
1395 return -EINVAL;
1396
1397 if (WARN_ON(new_ctx->replace_state ==
1398 IEEE80211_CHANCTX_REPLACES_OTHER))
1399 return -EINVAL;
1400
1401 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1402 &link->reserved,
1403 &tmp);
1404 if (WARN_ON(!chanreq))
1405 return -EINVAL;
1406
1407 ieee80211_change_chanctx(local, new_ctx, new_ctx, chanreq);
1408
1409 list_del(&link->reserved_chanctx_list);
1410 link->reserved_chanctx = NULL;
1411
1412 err = ieee80211_assign_link_chanctx(link, new_ctx, false);
1413 if (err) {
1414 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1415 ieee80211_free_chanctx(local, new_ctx, false);
1416
1417 goto out;
1418 }
1419
1420 out:
1421 ieee80211_link_chanctx_reservation_complete(link);
1422 return err;
1423 }
1424
1425 static bool
ieee80211_link_has_in_place_reservation(struct ieee80211_link_data * link)1426 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link)
1427 {
1428 struct ieee80211_sub_if_data *sdata = link->sdata;
1429 struct ieee80211_chanctx *old_ctx, *new_ctx;
1430
1431 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1432
1433 new_ctx = link->reserved_chanctx;
1434 old_ctx = ieee80211_link_get_chanctx(link);
1435
1436 if (!old_ctx)
1437 return false;
1438
1439 if (WARN_ON(!new_ctx))
1440 return false;
1441
1442 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1443 return false;
1444
1445 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1446 return false;
1447
1448 return true;
1449 }
1450
ieee80211_chsw_switch_vifs(struct ieee80211_local * local,int n_vifs)1451 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1452 int n_vifs)
1453 {
1454 struct ieee80211_vif_chanctx_switch *vif_chsw;
1455 struct ieee80211_link_data *link;
1456 struct ieee80211_chanctx *ctx, *old_ctx;
1457 int i, err;
1458
1459 lockdep_assert_wiphy(local->hw.wiphy);
1460
1461 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1462 if (!vif_chsw)
1463 return -ENOMEM;
1464
1465 i = 0;
1466 list_for_each_entry(ctx, &local->chanctx_list, list) {
1467 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1468 continue;
1469
1470 if (WARN_ON(!ctx->replace_ctx)) {
1471 err = -EINVAL;
1472 goto out;
1473 }
1474
1475 list_for_each_entry(link, &ctx->reserved_links,
1476 reserved_chanctx_list) {
1477 if (!ieee80211_link_has_in_place_reservation(link))
1478 continue;
1479
1480 old_ctx = ieee80211_link_get_chanctx(link);
1481 vif_chsw[i].vif = &link->sdata->vif;
1482 vif_chsw[i].old_ctx = &old_ctx->conf;
1483 vif_chsw[i].new_ctx = &ctx->conf;
1484 vif_chsw[i].link_conf = link->conf;
1485
1486 i++;
1487 }
1488 }
1489
1490 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1491 CHANCTX_SWMODE_SWAP_CONTEXTS);
1492
1493 out:
1494 kfree(vif_chsw);
1495 return err;
1496 }
1497
ieee80211_chsw_switch_ctxs(struct ieee80211_local * local)1498 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1499 {
1500 struct ieee80211_chanctx *ctx;
1501 int err;
1502
1503 lockdep_assert_wiphy(local->hw.wiphy);
1504
1505 list_for_each_entry(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->replace_ctx, false);
1513 err = ieee80211_add_chanctx(local, ctx);
1514 if (err)
1515 goto err;
1516 }
1517
1518 return 0;
1519
1520 err:
1521 WARN_ON(ieee80211_add_chanctx(local, ctx));
1522 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1523 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1524 continue;
1525
1526 if (!list_empty(&ctx->replace_ctx->assigned_links))
1527 continue;
1528
1529 ieee80211_del_chanctx(local, ctx, false);
1530 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1531 }
1532
1533 return err;
1534 }
1535
ieee80211_vif_use_reserved_switch(struct ieee80211_local * local)1536 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1537 {
1538 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1539 int err, n_assigned, n_reserved, n_ready;
1540 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1541
1542 lockdep_assert_wiphy(local->hw.wiphy);
1543
1544 /*
1545 * If there are 2 independent pairs of channel contexts performing
1546 * cross-switch of their vifs this code will still wait until both are
1547 * ready even though it could be possible to switch one before the
1548 * other is ready.
1549 *
1550 * For practical reasons and code simplicity just do a single huge
1551 * switch.
1552 */
1553
1554 /*
1555 * Verify if the reservation is still feasible.
1556 * - if it's not then disconnect
1557 * - if it is but not all vifs necessary are ready then defer
1558 */
1559
1560 list_for_each_entry(ctx, &local->chanctx_list, list) {
1561 struct ieee80211_link_data *link;
1562
1563 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1564 continue;
1565
1566 if (WARN_ON(!ctx->replace_ctx)) {
1567 err = -EINVAL;
1568 goto err;
1569 }
1570
1571 n_ctx++;
1572
1573 n_assigned = 0;
1574 n_reserved = 0;
1575 n_ready = 0;
1576
1577 list_for_each_entry(link, &ctx->replace_ctx->assigned_links,
1578 assigned_chanctx_list) {
1579 n_assigned++;
1580 if (link->reserved_chanctx) {
1581 n_reserved++;
1582 if (link->reserved_ready)
1583 n_ready++;
1584 }
1585 }
1586
1587 if (n_assigned != n_reserved) {
1588 if (n_ready == n_reserved) {
1589 wiphy_info(local->hw.wiphy,
1590 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1591 err = -EBUSY;
1592 goto err;
1593 }
1594
1595 return -EAGAIN;
1596 }
1597
1598 ctx->conf.radar_enabled = false;
1599 list_for_each_entry(link, &ctx->reserved_links,
1600 reserved_chanctx_list) {
1601 if (ieee80211_link_has_in_place_reservation(link) &&
1602 !link->reserved_ready)
1603 return -EAGAIN;
1604
1605 old_ctx = ieee80211_link_get_chanctx(link);
1606 if (old_ctx) {
1607 if (old_ctx->replace_state ==
1608 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1609 n_vifs_switch++;
1610 else
1611 n_vifs_assign++;
1612 } else {
1613 n_vifs_ctxless++;
1614 }
1615
1616 if (link->reserved_radar_required)
1617 ctx->conf.radar_enabled = true;
1618 }
1619 }
1620
1621 if (WARN_ON(n_ctx == 0) ||
1622 WARN_ON(n_vifs_switch == 0 &&
1623 n_vifs_assign == 0 &&
1624 n_vifs_ctxless == 0)) {
1625 err = -EINVAL;
1626 goto err;
1627 }
1628
1629 /* update station rate control and min width before switch */
1630 list_for_each_entry(ctx, &local->chanctx_list, list) {
1631 struct ieee80211_link_data *link;
1632
1633 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1634 continue;
1635
1636 if (WARN_ON(!ctx->replace_ctx)) {
1637 err = -EINVAL;
1638 goto err;
1639 }
1640
1641 list_for_each_entry(link, &ctx->reserved_links,
1642 reserved_chanctx_list) {
1643 if (!ieee80211_link_has_in_place_reservation(link))
1644 continue;
1645
1646 ieee80211_chan_bw_change(local,
1647 ieee80211_link_get_chanctx(link),
1648 true, true);
1649 }
1650
1651 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, true);
1652 }
1653
1654 /*
1655 * All necessary vifs are ready. Perform the switch now depending on
1656 * reservations and driver capabilities.
1657 */
1658
1659 if (n_vifs_switch > 0) {
1660 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1661 if (err)
1662 goto err;
1663 }
1664
1665 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1666 err = ieee80211_chsw_switch_ctxs(local);
1667 if (err)
1668 goto err;
1669 }
1670
1671 /*
1672 * Update all structures, values and pointers to point to new channel
1673 * context(s).
1674 */
1675 list_for_each_entry(ctx, &local->chanctx_list, list) {
1676 struct ieee80211_link_data *link, *link_tmp;
1677
1678 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1679 continue;
1680
1681 if (WARN_ON(!ctx->replace_ctx)) {
1682 err = -EINVAL;
1683 goto err;
1684 }
1685
1686 list_for_each_entry(link, &ctx->reserved_links,
1687 reserved_chanctx_list) {
1688 struct ieee80211_sub_if_data *sdata = link->sdata;
1689 struct ieee80211_bss_conf *link_conf = link->conf;
1690 u64 changed = 0;
1691
1692 if (!ieee80211_link_has_in_place_reservation(link))
1693 continue;
1694
1695 rcu_assign_pointer(link_conf->chanctx_conf,
1696 &ctx->conf);
1697
1698 if (sdata->vif.type == NL80211_IFTYPE_AP)
1699 __ieee80211_link_copy_chanctx_to_vlans(link,
1700 false);
1701
1702 ieee80211_check_fast_xmit_iface(sdata);
1703
1704 link->radar_required = link->reserved_radar_required;
1705
1706 if (link_conf->chanreq.oper.width != link->reserved.oper.width)
1707 changed = BSS_CHANGED_BANDWIDTH;
1708
1709 ieee80211_link_update_chanreq(link, &link->reserved);
1710 if (changed)
1711 ieee80211_link_info_change_notify(sdata,
1712 link,
1713 changed);
1714
1715 ieee80211_recalc_txpower(sdata, false);
1716 }
1717
1718 ieee80211_recalc_chanctx_chantype(local, ctx);
1719 ieee80211_recalc_smps_chanctx(local, ctx);
1720 ieee80211_recalc_radar_chanctx(local, ctx);
1721 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false);
1722
1723 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1724 reserved_chanctx_list) {
1725 if (ieee80211_link_get_chanctx(link) != ctx)
1726 continue;
1727
1728 list_del(&link->reserved_chanctx_list);
1729 list_move(&link->assigned_chanctx_list,
1730 &ctx->assigned_links);
1731 link->reserved_chanctx = NULL;
1732
1733 ieee80211_link_chanctx_reservation_complete(link);
1734 ieee80211_chan_bw_change(local, ctx, false, false);
1735 }
1736
1737 /*
1738 * This context might have been a dependency for an already
1739 * ready re-assign reservation interface that was deferred. Do
1740 * not propagate error to the caller though. The in-place
1741 * reservation for originally requested interface has already
1742 * succeeded at this point.
1743 */
1744 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1745 reserved_chanctx_list) {
1746 if (WARN_ON(ieee80211_link_has_in_place_reservation(link)))
1747 continue;
1748
1749 if (WARN_ON(link->reserved_chanctx != ctx))
1750 continue;
1751
1752 if (!link->reserved_ready)
1753 continue;
1754
1755 if (ieee80211_link_get_chanctx(link))
1756 err = ieee80211_link_use_reserved_reassign(link);
1757 else
1758 err = ieee80211_link_use_reserved_assign(link);
1759
1760 if (err) {
1761 link_info(link,
1762 "failed to finalize (re-)assign reservation (err=%d)\n",
1763 err);
1764 ieee80211_link_unreserve_chanctx(link);
1765 cfg80211_stop_iface(local->hw.wiphy,
1766 &link->sdata->wdev,
1767 GFP_KERNEL);
1768 }
1769 }
1770 }
1771
1772 /*
1773 * Finally free old contexts
1774 */
1775
1776 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1777 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1778 continue;
1779
1780 ctx->replace_ctx->replace_ctx = NULL;
1781 ctx->replace_ctx->replace_state =
1782 IEEE80211_CHANCTX_REPLACE_NONE;
1783
1784 list_del_rcu(&ctx->list);
1785 kfree_rcu(ctx, rcu_head);
1786 }
1787
1788 return 0;
1789
1790 err:
1791 list_for_each_entry(ctx, &local->chanctx_list, list) {
1792 struct ieee80211_link_data *link, *link_tmp;
1793
1794 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1795 continue;
1796
1797 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1798 reserved_chanctx_list) {
1799 ieee80211_link_unreserve_chanctx(link);
1800 ieee80211_link_chanctx_reservation_complete(link);
1801 }
1802 }
1803
1804 return err;
1805 }
1806
__ieee80211_link_release_channel(struct ieee80211_link_data * link,bool skip_idle_recalc)1807 void __ieee80211_link_release_channel(struct ieee80211_link_data *link,
1808 bool skip_idle_recalc)
1809 {
1810 struct ieee80211_sub_if_data *sdata = link->sdata;
1811 struct ieee80211_bss_conf *link_conf = link->conf;
1812 struct ieee80211_local *local = sdata->local;
1813 struct ieee80211_chanctx_conf *conf;
1814 struct ieee80211_chanctx *ctx;
1815 bool use_reserved_switch = false;
1816
1817 lockdep_assert_wiphy(local->hw.wiphy);
1818
1819 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1820 lockdep_is_held(&local->hw.wiphy->mtx));
1821 if (!conf)
1822 return;
1823
1824 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1825
1826 if (link->reserved_chanctx) {
1827 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
1828 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1)
1829 use_reserved_switch = true;
1830
1831 ieee80211_link_unreserve_chanctx(link);
1832 }
1833
1834 ieee80211_assign_link_chanctx(link, NULL, false);
1835 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1836 ieee80211_free_chanctx(local, ctx, skip_idle_recalc);
1837
1838 link->radar_required = false;
1839
1840 /* Unreserving may ready an in-place reservation. */
1841 if (use_reserved_switch)
1842 ieee80211_vif_use_reserved_switch(local);
1843 }
1844
_ieee80211_link_use_channel(struct ieee80211_link_data * link,const struct ieee80211_chan_req * chanreq,enum ieee80211_chanctx_mode mode,bool assign_on_failure)1845 int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
1846 const struct ieee80211_chan_req *chanreq,
1847 enum ieee80211_chanctx_mode mode,
1848 bool assign_on_failure)
1849 {
1850 struct ieee80211_sub_if_data *sdata = link->sdata;
1851 struct ieee80211_local *local = sdata->local;
1852 struct ieee80211_chanctx *ctx;
1853 u8 radar_detect_width = 0;
1854 bool reserved = false;
1855 int radio_idx;
1856 int ret;
1857
1858 lockdep_assert_wiphy(local->hw.wiphy);
1859
1860 if (!ieee80211_vif_link_active(&sdata->vif, link->link_id)) {
1861 ieee80211_link_update_chanreq(link, chanreq);
1862 return 0;
1863 }
1864
1865 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1866 &chanreq->oper,
1867 sdata->wdev.iftype);
1868 if (ret < 0)
1869 goto out;
1870 if (ret > 0)
1871 radar_detect_width = BIT(chanreq->oper.width);
1872
1873 link->radar_required = ret;
1874
1875 ret = ieee80211_check_combinations(sdata, &chanreq->oper, mode,
1876 radar_detect_width, -1);
1877 if (ret < 0)
1878 goto out;
1879
1880 __ieee80211_link_release_channel(link, false);
1881
1882 ctx = ieee80211_find_chanctx(local, link, chanreq, mode);
1883 /* Note: context is now reserved */
1884 if (ctx)
1885 reserved = true;
1886 else if (!ieee80211_find_available_radio(local, chanreq, &radio_idx))
1887 ctx = ERR_PTR(-EBUSY);
1888 else
1889 ctx = ieee80211_new_chanctx(local, chanreq, mode,
1890 assign_on_failure, radio_idx);
1891 if (IS_ERR(ctx)) {
1892 ret = PTR_ERR(ctx);
1893 goto out;
1894 }
1895
1896 ieee80211_link_update_chanreq(link, chanreq);
1897
1898 ret = ieee80211_assign_link_chanctx(link, ctx, assign_on_failure);
1899
1900 if (reserved) {
1901 /* remove reservation */
1902 WARN_ON(link->reserved_chanctx != ctx);
1903 link->reserved_chanctx = NULL;
1904 list_del(&link->reserved_chanctx_list);
1905 }
1906
1907 if (ret) {
1908 /* if assign fails refcount stays the same */
1909 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1910 ieee80211_free_chanctx(local, ctx, false);
1911 goto out;
1912 }
1913
1914 ieee80211_recalc_smps_chanctx(local, ctx);
1915 ieee80211_recalc_radar_chanctx(local, ctx);
1916 out:
1917 if (ret)
1918 link->radar_required = false;
1919
1920 return ret;
1921 }
1922
ieee80211_link_use_reserved_context(struct ieee80211_link_data * link)1923 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
1924 {
1925 struct ieee80211_sub_if_data *sdata = link->sdata;
1926 struct ieee80211_local *local = sdata->local;
1927 struct ieee80211_chanctx *new_ctx;
1928 struct ieee80211_chanctx *old_ctx;
1929 int err;
1930
1931 lockdep_assert_wiphy(local->hw.wiphy);
1932
1933 new_ctx = link->reserved_chanctx;
1934 old_ctx = ieee80211_link_get_chanctx(link);
1935
1936 if (WARN_ON(!new_ctx))
1937 return -EINVAL;
1938
1939 if (WARN_ON(new_ctx->replace_state ==
1940 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1941 return -EINVAL;
1942
1943 if (WARN_ON(link->reserved_ready))
1944 return -EINVAL;
1945
1946 link->reserved_ready = true;
1947
1948 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1949 if (old_ctx)
1950 return ieee80211_link_use_reserved_reassign(link);
1951
1952 return ieee80211_link_use_reserved_assign(link);
1953 }
1954
1955 /*
1956 * In-place reservation may need to be finalized now either if:
1957 * a) sdata is taking part in the swapping itself and is the last one
1958 * b) sdata has switched with a re-assign reservation to an existing
1959 * context readying in-place switching of old_ctx
1960 *
1961 * In case of (b) do not propagate the error up because the requested
1962 * sdata already switched successfully. Just spill an extra warning.
1963 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1964 * interfaces upon failure.
1965 */
1966 if ((old_ctx &&
1967 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1968 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1969 err = ieee80211_vif_use_reserved_switch(local);
1970 if (err && err != -EAGAIN) {
1971 if (new_ctx->replace_state ==
1972 IEEE80211_CHANCTX_REPLACES_OTHER)
1973 return err;
1974
1975 wiphy_info(local->hw.wiphy,
1976 "depending in-place reservation failed (err=%d)\n",
1977 err);
1978 }
1979 }
1980
1981 return 0;
1982 }
1983
1984 /*
1985 * This is similar to ieee80211_chanctx_compatible(), but rechecks
1986 * against all the links actually using it (except the one that's
1987 * passed, since that one is changing).
1988 * This is done in order to allow changes to the AP's bandwidth for
1989 * wider bandwidth OFDMA purposes, which wouldn't be treated as
1990 * compatible by ieee80211_chanctx_recheck() but is OK if the link
1991 * requesting the update is the only one using it.
1992 */
1993 static const struct ieee80211_chan_req *
ieee80211_chanctx_recheck(struct ieee80211_local * local,struct ieee80211_link_data * skip_link,struct ieee80211_chanctx * ctx,const struct ieee80211_chan_req * req,struct ieee80211_chan_req * tmp)1994 ieee80211_chanctx_recheck(struct ieee80211_local *local,
1995 struct ieee80211_link_data *skip_link,
1996 struct ieee80211_chanctx *ctx,
1997 const struct ieee80211_chan_req *req,
1998 struct ieee80211_chan_req *tmp)
1999 {
2000 const struct ieee80211_chan_req *ret = req;
2001 struct ieee80211_link_data *link;
2002
2003 lockdep_assert_wiphy(local->hw.wiphy);
2004
2005 for_each_sdata_link(local, link) {
2006 if (link == skip_link)
2007 continue;
2008
2009 if (rcu_access_pointer(link->conf->chanctx_conf) == &ctx->conf) {
2010 ret = ieee80211_chanreq_compatible(ret,
2011 &link->conf->chanreq,
2012 tmp);
2013 if (!ret)
2014 return NULL;
2015 }
2016
2017 if (link->reserved_chanctx == ctx) {
2018 ret = ieee80211_chanreq_compatible(ret,
2019 &link->reserved,
2020 tmp);
2021 if (!ret)
2022 return NULL;
2023 }
2024 }
2025
2026 *tmp = *ret;
2027 return tmp;
2028 }
2029
ieee80211_link_change_chanreq(struct ieee80211_link_data * link,const struct ieee80211_chan_req * chanreq,u64 * changed)2030 int ieee80211_link_change_chanreq(struct ieee80211_link_data *link,
2031 const struct ieee80211_chan_req *chanreq,
2032 u64 *changed)
2033 {
2034 struct ieee80211_sub_if_data *sdata = link->sdata;
2035 struct ieee80211_bss_conf *link_conf = link->conf;
2036 struct ieee80211_local *local = sdata->local;
2037 struct ieee80211_chanctx_conf *conf;
2038 struct ieee80211_chanctx *ctx;
2039 const struct ieee80211_chan_req *compat;
2040 struct ieee80211_chan_req tmp;
2041
2042 lockdep_assert_wiphy(local->hw.wiphy);
2043
2044 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy,
2045 &chanreq->oper,
2046 IEEE80211_CHAN_DISABLED))
2047 return -EINVAL;
2048
2049 /* for non-HT 20 MHz the rest doesn't matter */
2050 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT &&
2051 cfg80211_chandef_identical(&chanreq->oper, &link_conf->chanreq.oper))
2052 return 0;
2053
2054 /* but you cannot switch to/from it */
2055 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
2056 link_conf->chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT)
2057 return -EINVAL;
2058
2059 conf = rcu_dereference_protected(link_conf->chanctx_conf,
2060 lockdep_is_held(&local->hw.wiphy->mtx));
2061 if (!conf)
2062 return -EINVAL;
2063
2064 ctx = container_of(conf, struct ieee80211_chanctx, conf);
2065
2066 compat = ieee80211_chanctx_recheck(local, link, ctx, chanreq, &tmp);
2067 if (!compat)
2068 return -EINVAL;
2069
2070 switch (ctx->replace_state) {
2071 case IEEE80211_CHANCTX_REPLACE_NONE:
2072 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, compat,
2073 &tmp))
2074 return -EBUSY;
2075 break;
2076 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
2077 /* TODO: Perhaps the bandwidth change could be treated as a
2078 * reservation itself? */
2079 return -EBUSY;
2080 case IEEE80211_CHANCTX_REPLACES_OTHER:
2081 /* channel context that is going to replace another channel
2082 * context doesn't really exist and shouldn't be assigned
2083 * anywhere yet */
2084 WARN_ON(1);
2085 break;
2086 }
2087
2088 ieee80211_link_update_chanreq(link, chanreq);
2089
2090 ieee80211_recalc_chanctx_chantype(local, ctx);
2091
2092 *changed |= BSS_CHANGED_BANDWIDTH;
2093 return 0;
2094 }
2095
ieee80211_link_release_channel(struct ieee80211_link_data * link)2096 void ieee80211_link_release_channel(struct ieee80211_link_data *link)
2097 {
2098 struct ieee80211_sub_if_data *sdata = link->sdata;
2099
2100 lockdep_assert_wiphy(sdata->local->hw.wiphy);
2101
2102 if (rcu_access_pointer(link->conf->chanctx_conf))
2103 __ieee80211_link_release_channel(link, false);
2104 }
2105
ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data * link)2106 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link)
2107 {
2108 struct ieee80211_sub_if_data *sdata = link->sdata;
2109 unsigned int link_id = link->link_id;
2110 struct ieee80211_bss_conf *link_conf = link->conf;
2111 struct ieee80211_bss_conf *ap_conf;
2112 struct ieee80211_local *local = sdata->local;
2113 struct ieee80211_sub_if_data *ap;
2114 struct ieee80211_chanctx_conf *conf;
2115
2116 lockdep_assert_wiphy(local->hw.wiphy);
2117
2118 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
2119 return;
2120
2121 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
2122
2123 ap_conf = wiphy_dereference(local->hw.wiphy,
2124 ap->vif.link_conf[link_id]);
2125 conf = wiphy_dereference(local->hw.wiphy,
2126 ap_conf->chanctx_conf);
2127 rcu_assign_pointer(link_conf->chanctx_conf, conf);
2128 }
2129
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)2130 void ieee80211_iter_chan_contexts_atomic(
2131 struct ieee80211_hw *hw,
2132 void (*iter)(struct ieee80211_hw *hw,
2133 struct ieee80211_chanctx_conf *chanctx_conf,
2134 void *data),
2135 void *iter_data)
2136 {
2137 struct ieee80211_local *local = hw_to_local(hw);
2138 struct ieee80211_chanctx *ctx;
2139
2140 rcu_read_lock();
2141 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
2142 if (ctx->driver_present)
2143 iter(hw, &ctx->conf, iter_data);
2144 rcu_read_unlock();
2145 }
2146 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
2147