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printf: Remove unused 'bprintf'
[drm/drm-misc.git] / net / mac80211 / chan.c
bloba442cb66752032206b271696b42eb3cde39e4366
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mac80211 - channel management
4 * Copyright 2020 - 2024 Intel Corporation
5 */
6
7 #include <linux/nl80211.h>
8 #include <linux/export.h>
9 #include <linux/rtnetlink.h>
10 #include <net/cfg80211.h>
11 #include "ieee80211_i.h"
12 #include "driver-ops.h"
13 #include "rate.h"
14
15 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
16 struct ieee80211_chanctx *ctx)
17 {
18 struct ieee80211_link_data *link;
19 int num = 0;
20
21 lockdep_assert_wiphy(local->hw.wiphy);
22
23 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list)
24 num++;
25
26 return num;
27 }
28
29 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
30 struct ieee80211_chanctx *ctx)
31 {
32 struct ieee80211_link_data *link;
33 int num = 0;
34
35 lockdep_assert_wiphy(local->hw.wiphy);
36
37 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list)
38 num++;
39
40 return num;
41 }
42
43 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
44 struct ieee80211_chanctx *ctx)
45 {
46 return ieee80211_chanctx_num_assigned(local, ctx) +
47 ieee80211_chanctx_num_reserved(local, ctx);
48 }
49
50 static int ieee80211_num_chanctx(struct ieee80211_local *local, int radio_idx)
51 {
52 struct ieee80211_chanctx *ctx;
53 int num = 0;
54
55 lockdep_assert_wiphy(local->hw.wiphy);
56
57 list_for_each_entry(ctx, &local->chanctx_list, list) {
58 if (radio_idx >= 0 && ctx->conf.radio_idx != radio_idx)
59 continue;
60 num++;
61 }
62
63 return num;
64 }
65
66 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local,
67 int radio_idx)
68 {
69 lockdep_assert_wiphy(local->hw.wiphy);
70
71 return ieee80211_num_chanctx(local, radio_idx) <
72 ieee80211_max_num_channels(local, radio_idx);
73 }
74
75 static struct ieee80211_chanctx *
76 ieee80211_link_get_chanctx(struct ieee80211_link_data *link)
77 {
78 struct ieee80211_local *local __maybe_unused = link->sdata->local;
79 struct ieee80211_chanctx_conf *conf;
80
81 conf = rcu_dereference_protected(link->conf->chanctx_conf,
82 lockdep_is_held(&local->hw.wiphy->mtx));
83 if (!conf)
84 return NULL;
85
86 return container_of(conf, struct ieee80211_chanctx, conf);
87 }
88
89 bool ieee80211_chanreq_identical(const struct ieee80211_chan_req *a,
90 const struct ieee80211_chan_req *b)
91 {
92 if (!cfg80211_chandef_identical(&a->oper, &b->oper))
93 return false;
94 if (!a->ap.chan && !b->ap.chan)
95 return true;
96 return cfg80211_chandef_identical(&a->ap, &b->ap);
97 }
98
99 static const struct ieee80211_chan_req *
100 ieee80211_chanreq_compatible(const struct ieee80211_chan_req *a,
101 const struct ieee80211_chan_req *b,
102 struct ieee80211_chan_req *tmp)
103 {
104 const struct cfg80211_chan_def *compat;
105
106 if (a->ap.chan && b->ap.chan &&
107 !cfg80211_chandef_identical(&a->ap, &b->ap))
108 return NULL;
109
110 compat = cfg80211_chandef_compatible(&a->oper, &b->oper);
111 if (!compat)
112 return NULL;
113
114 /* Note: later code assumes this always fills & returns tmp if compat */
115 tmp->oper = *compat;
116 tmp->ap = a->ap.chan ? a->ap : b->ap;
117 return tmp;
118 }
119
120 static const struct ieee80211_chan_req *
121 ieee80211_chanctx_compatible(struct ieee80211_chanctx *ctx,
122 const struct ieee80211_chan_req *req,
123 struct ieee80211_chan_req *tmp)
124 {
125 const struct ieee80211_chan_req *ret;
126 struct ieee80211_chan_req tmp2;
127
128 *tmp = (struct ieee80211_chan_req){
129 .oper = ctx->conf.def,
130 .ap = ctx->conf.ap,
131 };
132
133 ret = ieee80211_chanreq_compatible(tmp, req, &tmp2);
134 if (!ret)
135 return NULL;
136 *tmp = *ret;
137 return tmp;
138 }
139
140 static const struct ieee80211_chan_req *
141 ieee80211_chanctx_reserved_chanreq(struct ieee80211_local *local,
142 struct ieee80211_chanctx *ctx,
143 const struct ieee80211_chan_req *req,
144 struct ieee80211_chan_req *tmp)
145 {
146 struct ieee80211_link_data *link;
147
148 lockdep_assert_wiphy(local->hw.wiphy);
149
150 if (WARN_ON(!req))
151 return NULL;
152
153 list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) {
154 req = ieee80211_chanreq_compatible(&link->reserved, req, tmp);
155 if (!req)
156 break;
157 }
158
159 return req;
160 }
161
162 static const struct ieee80211_chan_req *
163 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
164 struct ieee80211_chanctx *ctx,
165 const struct ieee80211_chan_req *compat,
166 struct ieee80211_chan_req *tmp)
167 {
168 struct ieee80211_link_data *link;
169 const struct ieee80211_chan_req *comp_def = compat;
170
171 lockdep_assert_wiphy(local->hw.wiphy);
172
173 list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) {
174 struct ieee80211_bss_conf *link_conf = link->conf;
175
176 if (link->reserved_chanctx)
177 continue;
178
179 comp_def = ieee80211_chanreq_compatible(&link_conf->chanreq,
180 comp_def, tmp);
181 if (!comp_def)
182 break;
183 }
184
185 return comp_def;
186 }
187
188 static bool
189 ieee80211_chanctx_can_reserve(struct ieee80211_local *local,
190 struct ieee80211_chanctx *ctx,
191 const struct ieee80211_chan_req *req)
192 {
193 struct ieee80211_chan_req tmp;
194
195 lockdep_assert_wiphy(local->hw.wiphy);
196
197 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp))
198 return false;
199
200 if (!ieee80211_chanctx_non_reserved_chandef(local, ctx, req, &tmp))
201 return false;
202
203 if (!list_empty(&ctx->reserved_links) &&
204 ieee80211_chanctx_reserved_chanreq(local, ctx, req, &tmp))
205 return true;
206
207 return false;
208 }
209
210 static struct ieee80211_chanctx *
211 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
212 const struct ieee80211_chan_req *chanreq,
213 enum ieee80211_chanctx_mode mode)
214 {
215 struct ieee80211_chanctx *ctx;
216
217 lockdep_assert_wiphy(local->hw.wiphy);
218
219 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
220 return NULL;
221
222 list_for_each_entry(ctx, &local->chanctx_list, list) {
223 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
224 continue;
225
226 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
227 continue;
228
229 if (!ieee80211_chanctx_can_reserve(local, ctx, chanreq))
230 continue;
231
232 return ctx;
233 }
234
235 return NULL;
236 }
237
238 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta,
239 unsigned int link_id)
240 {
241 enum ieee80211_sta_rx_bandwidth width;
242 struct link_sta_info *link_sta;
243
244 link_sta = wiphy_dereference(sta->local->hw.wiphy, sta->link[link_id]);
245
246 /* no effect if this STA has no presence on this link */
247 if (!link_sta)
248 return NL80211_CHAN_WIDTH_20_NOHT;
249
250 width = ieee80211_sta_cap_rx_bw(link_sta);
251
252 switch (width) {
253 case IEEE80211_STA_RX_BW_20:
254 if (link_sta->pub->ht_cap.ht_supported)
255 return NL80211_CHAN_WIDTH_20;
256 else
257 return NL80211_CHAN_WIDTH_20_NOHT;
258 case IEEE80211_STA_RX_BW_40:
259 return NL80211_CHAN_WIDTH_40;
260 case IEEE80211_STA_RX_BW_80:
261 return NL80211_CHAN_WIDTH_80;
262 case IEEE80211_STA_RX_BW_160:
263 /*
264 * This applied for both 160 and 80+80. since we use
265 * the returned value to consider degradation of
266 * ctx->conf.min_def, we have to make sure to take
267 * the bigger one (NL80211_CHAN_WIDTH_160).
268 * Otherwise we might try degrading even when not
269 * needed, as the max required sta_bw returned (80+80)
270 * might be smaller than the configured bw (160).
271 */
272 return NL80211_CHAN_WIDTH_160;
273 case IEEE80211_STA_RX_BW_320:
274 return NL80211_CHAN_WIDTH_320;
275 default:
276 WARN_ON(1);
277 return NL80211_CHAN_WIDTH_20;
278 }
279 }
280
281 static enum nl80211_chan_width
282 ieee80211_get_max_required_bw(struct ieee80211_link_data *link)
283 {
284 struct ieee80211_sub_if_data *sdata = link->sdata;
285 unsigned int link_id = link->link_id;
286 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
287 struct sta_info *sta;
288
289 lockdep_assert_wiphy(sdata->local->hw.wiphy);
290
291 list_for_each_entry(sta, &sdata->local->sta_list, list) {
292 if (sdata != sta->sdata &&
293 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
294 continue;
295
296 max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id));
297 }
298
299 return max_bw;
300 }
301
302 static enum nl80211_chan_width
303 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
304 struct ieee80211_chanctx *ctx,
305 struct ieee80211_link_data *rsvd_for,
306 bool check_reserved)
307 {
308 struct ieee80211_sub_if_data *sdata;
309 struct ieee80211_link_data *link;
310 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
311
312 if (WARN_ON(check_reserved && rsvd_for))
313 return ctx->conf.def.width;
314
315 for_each_sdata_link(local, link) {
316 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
317
318 if (check_reserved) {
319 if (link->reserved_chanctx != ctx)
320 continue;
321 } else if (link != rsvd_for &&
322 rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf)
323 continue;
324
325 switch (link->sdata->vif.type) {
326 case NL80211_IFTYPE_STATION:
327 if (!link->sdata->vif.cfg.assoc) {
328 /*
329 * The AP's sta->bandwidth may not yet be set
330 * at this point (pre-association), so simply
331 * take the width from the chandef. We cannot
332 * have TDLS peers yet (only after association).
333 */
334 width = link->conf->chanreq.oper.width;
335 break;
336 }
337 /*
338 * otherwise just use min_def like in AP, depending on what
339 * we currently think the AP STA (and possibly TDLS peers)
340 * require(s)
341 */
342 fallthrough;
343 case NL80211_IFTYPE_AP:
344 case NL80211_IFTYPE_AP_VLAN:
345 width = ieee80211_get_max_required_bw(link);
346 break;
347 case NL80211_IFTYPE_P2P_DEVICE:
348 case NL80211_IFTYPE_NAN:
349 continue;
350 case NL80211_IFTYPE_MONITOR:
351 WARN_ON_ONCE(!ieee80211_hw_check(&local->hw,
352 NO_VIRTUAL_MONITOR));
353 fallthrough;
354 case NL80211_IFTYPE_ADHOC:
355 case NL80211_IFTYPE_MESH_POINT:
356 case NL80211_IFTYPE_OCB:
357 width = link->conf->chanreq.oper.width;
358 break;
359 case NL80211_IFTYPE_WDS:
360 case NL80211_IFTYPE_UNSPECIFIED:
361 case NUM_NL80211_IFTYPES:
362 case NL80211_IFTYPE_P2P_CLIENT:
363 case NL80211_IFTYPE_P2P_GO:
364 WARN_ON_ONCE(1);
365 }
366
367 max_bw = max(max_bw, width);
368 }
369
370 /* use the configured bandwidth in case of monitor interface */
371 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
372 if (sdata &&
373 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &ctx->conf)
374 max_bw = max(max_bw, ctx->conf.def.width);
375
376 return max_bw;
377 }
378
379 /*
380 * recalc the min required chan width of the channel context, which is
381 * the max of min required widths of all the interfaces bound to this
382 * channel context.
383 */
384 static u32
385 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
386 struct ieee80211_chanctx *ctx,
387 struct ieee80211_link_data *rsvd_for,
388 bool check_reserved)
389 {
390 enum nl80211_chan_width max_bw;
391 struct cfg80211_chan_def min_def;
392
393 lockdep_assert_wiphy(local->hw.wiphy);
394
395 /* don't optimize non-20MHz based and radar_enabled confs */
396 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
397 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
398 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
399 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
400 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
401 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
402 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
403 ctx->conf.radar_enabled) {
404 ctx->conf.min_def = ctx->conf.def;
405 return 0;
406 }
407
408 max_bw = ieee80211_get_chanctx_max_required_bw(local, ctx, rsvd_for,
409 check_reserved);
410
411 /* downgrade chandef up to max_bw */
412 min_def = ctx->conf.def;
413 while (min_def.width > max_bw)
414 ieee80211_chandef_downgrade(&min_def, NULL);
415
416 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
417 return 0;
418
419 ctx->conf.min_def = min_def;
420 if (!ctx->driver_present)
421 return 0;
422
423 return IEEE80211_CHANCTX_CHANGE_MIN_DEF;
424 }
425
426 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
427 struct ieee80211_chanctx *ctx,
428 bool reserved, bool narrowed)
429 {
430 struct sta_info *sta;
431 struct ieee80211_supported_band *sband =
432 local->hw.wiphy->bands[ctx->conf.def.chan->band];
433
434 rcu_read_lock();
435 list_for_each_entry_rcu(sta, &local->sta_list,
436 list) {
437 struct ieee80211_sub_if_data *sdata = sta->sdata;
438 enum ieee80211_sta_rx_bandwidth new_sta_bw;
439 unsigned int link_id;
440
441 if (!ieee80211_sdata_running(sta->sdata))
442 continue;
443
444 for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
445 struct ieee80211_link_data *link =
446 rcu_dereference(sdata->link[link_id]);
447 struct ieee80211_bss_conf *link_conf;
448 struct cfg80211_chan_def *new_chandef;
449 struct link_sta_info *link_sta;
450
451 if (!link)
452 continue;
453
454 link_conf = link->conf;
455
456 if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf)
457 continue;
458
459 link_sta = rcu_dereference(sta->link[link_id]);
460 if (!link_sta)
461 continue;
462
463 if (reserved)
464 new_chandef = &link->reserved.oper;
465 else
466 new_chandef = &link_conf->chanreq.oper;
467
468 new_sta_bw = _ieee80211_sta_cur_vht_bw(link_sta,
469 new_chandef);
470
471 /* nothing change */
472 if (new_sta_bw == link_sta->pub->bandwidth)
473 continue;
474
475 /* vif changed to narrow BW and narrow BW for station wasn't
476 * requested or vice versa */
477 if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed)
478 continue;
479
480 link_sta->pub->bandwidth = new_sta_bw;
481 rate_control_rate_update(local, sband, link_sta,
482 IEEE80211_RC_BW_CHANGED);
483 }
484 }
485 rcu_read_unlock();
486 }
487
488 /*
489 * recalc the min required chan width of the channel context, which is
490 * the max of min required widths of all the interfaces bound to this
491 * channel context.
492 */
493 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
494 struct ieee80211_chanctx *ctx,
495 struct ieee80211_link_data *rsvd_for,
496 bool check_reserved)
497 {
498 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for,
499 check_reserved);
500
501 if (!changed)
502 return;
503
504 /* check is BW narrowed */
505 ieee80211_chan_bw_change(local, ctx, false, true);
506
507 drv_change_chanctx(local, ctx, changed);
508
509 /* check is BW wider */
510 ieee80211_chan_bw_change(local, ctx, false, false);
511 }
512
513 static void _ieee80211_change_chanctx(struct ieee80211_local *local,
514 struct ieee80211_chanctx *ctx,
515 struct ieee80211_chanctx *old_ctx,
516 const struct ieee80211_chan_req *chanreq,
517 struct ieee80211_link_data *rsvd_for)
518 {
519 const struct cfg80211_chan_def *chandef = &chanreq->oper;
520 struct ieee80211_chan_req ctx_req = {
521 .oper = ctx->conf.def,
522 .ap = ctx->conf.ap,
523 };
524 u32 changed = 0;
525
526 /* expected to handle only 20/40/80/160/320 channel widths */
527 switch (chandef->width) {
528 case NL80211_CHAN_WIDTH_20_NOHT:
529 case NL80211_CHAN_WIDTH_20:
530 case NL80211_CHAN_WIDTH_40:
531 case NL80211_CHAN_WIDTH_80:
532 case NL80211_CHAN_WIDTH_80P80:
533 case NL80211_CHAN_WIDTH_160:
534 case NL80211_CHAN_WIDTH_320:
535 break;
536 default:
537 WARN_ON(1);
538 }
539
540 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
541 * due to maybe not returning from it, e.g in case new context was added
542 * first time with all parameters up to date.
543 */
544 ieee80211_chan_bw_change(local, old_ctx, false, true);
545
546 if (ieee80211_chanreq_identical(&ctx_req, chanreq)) {
547 ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false);
548 return;
549 }
550
551 WARN_ON(ieee80211_chanctx_refcount(local, ctx) > 1 &&
552 !cfg80211_chandef_compatible(&ctx->conf.def, &chanreq->oper));
553
554 ieee80211_remove_wbrf(local, &ctx->conf.def);
555
556 if (!cfg80211_chandef_identical(&ctx->conf.def, &chanreq->oper)) {
557 if (ctx->conf.def.width != chanreq->oper.width)
558 changed |= IEEE80211_CHANCTX_CHANGE_WIDTH;
559 if (ctx->conf.def.punctured != chanreq->oper.punctured)
560 changed |= IEEE80211_CHANCTX_CHANGE_PUNCTURING;
561 }
562 if (!cfg80211_chandef_identical(&ctx->conf.ap, &chanreq->ap))
563 changed |= IEEE80211_CHANCTX_CHANGE_AP;
564 ctx->conf.def = *chandef;
565 ctx->conf.ap = chanreq->ap;
566
567 /* check if min chanctx also changed */
568 changed |= _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for, false);
569
570 ieee80211_add_wbrf(local, &ctx->conf.def);
571
572 drv_change_chanctx(local, ctx, changed);
573
574 /* check if BW is wider */
575 ieee80211_chan_bw_change(local, old_ctx, false, false);
576 }
577
578 static void ieee80211_change_chanctx(struct ieee80211_local *local,
579 struct ieee80211_chanctx *ctx,
580 struct ieee80211_chanctx *old_ctx,
581 const struct ieee80211_chan_req *chanreq)
582 {
583 _ieee80211_change_chanctx(local, ctx, old_ctx, chanreq, NULL);
584 }
585
586 /* Note: if successful, the returned chanctx is reserved for the link */
587 static struct ieee80211_chanctx *
588 ieee80211_find_chanctx(struct ieee80211_local *local,
589 struct ieee80211_link_data *link,
590 const struct ieee80211_chan_req *chanreq,
591 enum ieee80211_chanctx_mode mode)
592 {
593 struct ieee80211_chan_req tmp;
594 struct ieee80211_chanctx *ctx;
595
596 lockdep_assert_wiphy(local->hw.wiphy);
597
598 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
599 return NULL;
600
601 if (WARN_ON(link->reserved_chanctx))
602 return NULL;
603
604 list_for_each_entry(ctx, &local->chanctx_list, list) {
605 const struct ieee80211_chan_req *compat;
606
607 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
608 continue;
609
610 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
611 continue;
612
613 compat = ieee80211_chanctx_compatible(ctx, chanreq, &tmp);
614 if (!compat)
615 continue;
616
617 compat = ieee80211_chanctx_reserved_chanreq(local, ctx,
618 compat, &tmp);
619 if (!compat)
620 continue;
621
622 /*
623 * Reserve the chanctx temporarily, as the driver might change
624 * active links during callbacks we make into it below and/or
625 * later during assignment, which could (otherwise) cause the
626 * context to actually be removed.
627 */
628 link->reserved_chanctx = ctx;
629 list_add(&link->reserved_chanctx_list,
630 &ctx->reserved_links);
631
632 ieee80211_change_chanctx(local, ctx, ctx, compat);
633
634 return ctx;
635 }
636
637 return NULL;
638 }
639
640 bool ieee80211_is_radar_required(struct ieee80211_local *local)
641 {
642 struct ieee80211_link_data *link;
643
644 lockdep_assert_wiphy(local->hw.wiphy);
645
646 for_each_sdata_link(local, link) {
647 if (link->radar_required)
648 return true;
649 }
650
651 return false;
652 }
653
654 static bool
655 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
656 struct ieee80211_chanctx *ctx)
657 {
658 struct ieee80211_chanctx_conf *conf = &ctx->conf;
659 struct ieee80211_link_data *link;
660
661 lockdep_assert_wiphy(local->hw.wiphy);
662
663 for_each_sdata_link(local, link) {
664 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
665 continue;
666 if (!link->radar_required)
667 continue;
668 return true;
669 }
670
671 return false;
672 }
673
674 static struct ieee80211_chanctx *
675 ieee80211_alloc_chanctx(struct ieee80211_local *local,
676 const struct ieee80211_chan_req *chanreq,
677 enum ieee80211_chanctx_mode mode,
678 int radio_idx)
679 {
680 struct ieee80211_chanctx *ctx;
681
682 lockdep_assert_wiphy(local->hw.wiphy);
683
684 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
685 if (!ctx)
686 return NULL;
687
688 INIT_LIST_HEAD(&ctx->assigned_links);
689 INIT_LIST_HEAD(&ctx->reserved_links);
690 ctx->conf.def = chanreq->oper;
691 ctx->conf.ap = chanreq->ap;
692 ctx->conf.rx_chains_static = 1;
693 ctx->conf.rx_chains_dynamic = 1;
694 ctx->mode = mode;
695 ctx->conf.radar_enabled = false;
696 ctx->conf.radio_idx = radio_idx;
697 ctx->radar_detected = false;
698 _ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false);
699
700 return ctx;
701 }
702
703 static int ieee80211_add_chanctx(struct ieee80211_local *local,
704 struct ieee80211_chanctx *ctx)
705 {
706 u32 changed;
707 int err;
708
709 lockdep_assert_wiphy(local->hw.wiphy);
710
711 ieee80211_add_wbrf(local, &ctx->conf.def);
712
713 /* turn idle off *before* setting channel -- some drivers need that */
714 changed = ieee80211_idle_off(local);
715 if (changed)
716 ieee80211_hw_config(local, changed);
717
718 err = drv_add_chanctx(local, ctx);
719 if (err) {
720 ieee80211_recalc_idle(local);
721 return err;
722 }
723
724 return 0;
725 }
726
727 static struct ieee80211_chanctx *
728 ieee80211_new_chanctx(struct ieee80211_local *local,
729 const struct ieee80211_chan_req *chanreq,
730 enum ieee80211_chanctx_mode mode,
731 bool assign_on_failure,
732 int radio_idx)
733 {
734 struct ieee80211_chanctx *ctx;
735 int err;
736
737 lockdep_assert_wiphy(local->hw.wiphy);
738
739 ctx = ieee80211_alloc_chanctx(local, chanreq, mode, radio_idx);
740 if (!ctx)
741 return ERR_PTR(-ENOMEM);
742
743 err = ieee80211_add_chanctx(local, ctx);
744 if (!assign_on_failure && err) {
745 kfree(ctx);
746 return ERR_PTR(err);
747 }
748 /* We ignored a driver error, see _ieee80211_set_active_links */
749 WARN_ON_ONCE(err && !local->in_reconfig);
750
751 list_add_rcu(&ctx->list, &local->chanctx_list);
752 return ctx;
753 }
754
755 static void ieee80211_del_chanctx(struct ieee80211_local *local,
756 struct ieee80211_chanctx *ctx,
757 bool skip_idle_recalc)
758 {
759 lockdep_assert_wiphy(local->hw.wiphy);
760
761 drv_remove_chanctx(local, ctx);
762
763 if (!skip_idle_recalc)
764 ieee80211_recalc_idle(local);
765
766 ieee80211_remove_wbrf(local, &ctx->conf.def);
767 }
768
769 static void ieee80211_free_chanctx(struct ieee80211_local *local,
770 struct ieee80211_chanctx *ctx,
771 bool skip_idle_recalc)
772 {
773 lockdep_assert_wiphy(local->hw.wiphy);
774
775 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
776
777 list_del_rcu(&ctx->list);
778 ieee80211_del_chanctx(local, ctx, skip_idle_recalc);
779 kfree_rcu(ctx, rcu_head);
780 }
781
782 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
783 struct ieee80211_chanctx *ctx)
784 {
785 struct ieee80211_chanctx_conf *conf = &ctx->conf;
786 const struct ieee80211_chan_req *compat = NULL;
787 struct ieee80211_link_data *link;
788 struct ieee80211_chan_req tmp;
789 struct sta_info *sta;
790
791 lockdep_assert_wiphy(local->hw.wiphy);
792
793 for_each_sdata_link(local, link) {
794 struct ieee80211_bss_conf *link_conf;
795
796 if (link->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
797 continue;
798
799 link_conf = link->conf;
800
801 if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
802 continue;
803
804 if (!compat)
805 compat = &link_conf->chanreq;
806
807 compat = ieee80211_chanreq_compatible(&link_conf->chanreq,
808 compat, &tmp);
809 if (WARN_ON_ONCE(!compat))
810 return;
811 }
812
813 if (WARN_ON_ONCE(!compat))
814 return;
815
816 /* TDLS peers can sometimes affect the chandef width */
817 list_for_each_entry(sta, &local->sta_list, list) {
818 struct ieee80211_sub_if_data *sdata = sta->sdata;
819 struct ieee80211_chan_req tdls_chanreq = {};
820 int tdls_link_id;
821
822 if (!sta->uploaded ||
823 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
824 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
825 !sta->tdls_chandef.chan)
826 continue;
827
828 tdls_link_id = ieee80211_tdls_sta_link_id(sta);
829 link = sdata_dereference(sdata->link[tdls_link_id], sdata);
830 if (!link)
831 continue;
832
833 if (rcu_access_pointer(link->conf->chanctx_conf) != conf)
834 continue;
835
836 tdls_chanreq.oper = sta->tdls_chandef;
837
838 /* note this always fills and returns &tmp if compat */
839 compat = ieee80211_chanreq_compatible(&tdls_chanreq,
840 compat, &tmp);
841 if (WARN_ON_ONCE(!compat))
842 return;
843 }
844
845 ieee80211_change_chanctx(local, ctx, ctx, compat);
846 }
847
848 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
849 struct ieee80211_chanctx *chanctx)
850 {
851 bool radar_enabled;
852
853 lockdep_assert_wiphy(local->hw.wiphy);
854
855 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
856
857 if (radar_enabled == chanctx->conf.radar_enabled)
858 return;
859
860 chanctx->conf.radar_enabled = radar_enabled;
861
862 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
863 }
864
865 static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
866 struct ieee80211_chanctx *new_ctx,
867 bool assign_on_failure)
868 {
869 struct ieee80211_sub_if_data *sdata = link->sdata;
870 struct ieee80211_local *local = sdata->local;
871 struct ieee80211_chanctx_conf *conf;
872 struct ieee80211_chanctx *curr_ctx = NULL;
873 bool new_idle;
874 int ret;
875
876 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
877 return -EOPNOTSUPP;
878
879 conf = rcu_dereference_protected(link->conf->chanctx_conf,
880 lockdep_is_held(&local->hw.wiphy->mtx));
881
882 if (conf) {
883 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
884
885 drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx);
886 conf = NULL;
887 list_del(&link->assigned_chanctx_list);
888 }
889
890 if (new_ctx) {
891 /* recalc considering the link we'll use it for now */
892 ieee80211_recalc_chanctx_min_def(local, new_ctx, link, false);
893
894 ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx);
895 if (assign_on_failure || !ret) {
896 /* Need to continue, see _ieee80211_set_active_links */
897 WARN_ON_ONCE(ret && !local->in_reconfig);
898 ret = 0;
899
900 /* succeeded, so commit it to the data structures */
901 conf = &new_ctx->conf;
902 list_add(&link->assigned_chanctx_list,
903 &new_ctx->assigned_links);
904 }
905 } else {
906 ret = 0;
907 }
908
909 rcu_assign_pointer(link->conf->chanctx_conf, conf);
910
911 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
912 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
913 ieee80211_recalc_smps_chanctx(local, curr_ctx);
914 ieee80211_recalc_radar_chanctx(local, curr_ctx);
915 ieee80211_recalc_chanctx_min_def(local, curr_ctx, NULL, false);
916 }
917
918 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
919 ieee80211_recalc_txpower(link, false);
920 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false);
921 }
922
923 if (conf) {
924 new_idle = false;
925 } else {
926 struct ieee80211_link_data *tmp;
927
928 new_idle = true;
929 for_each_sdata_link(local, tmp) {
930 if (rcu_access_pointer(tmp->conf->chanctx_conf)) {
931 new_idle = false;
932 break;
933 }
934 }
935 }
936
937 if (new_idle != sdata->vif.cfg.idle) {
938 sdata->vif.cfg.idle = new_idle;
939
940 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
941 sdata->vif.type != NL80211_IFTYPE_MONITOR)
942 ieee80211_vif_cfg_change_notify(sdata, BSS_CHANGED_IDLE);
943 }
944
945 ieee80211_check_fast_xmit_iface(sdata);
946
947 return ret;
948 }
949
950 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
951 struct ieee80211_chanctx *chanctx)
952 {
953 struct ieee80211_sub_if_data *sdata;
954 u8 rx_chains_static, rx_chains_dynamic;
955 struct ieee80211_link_data *link;
956
957 lockdep_assert_wiphy(local->hw.wiphy);
958
959 rx_chains_static = 1;
960 rx_chains_dynamic = 1;
961
962 for_each_sdata_link(local, link) {
963 u8 needed_static, needed_dynamic;
964
965 switch (link->sdata->vif.type) {
966 case NL80211_IFTYPE_STATION:
967 if (!link->sdata->u.mgd.associated)
968 continue;
969 break;
970 case NL80211_IFTYPE_MONITOR:
971 if (!ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
972 continue;
973 break;
974 case NL80211_IFTYPE_AP:
975 case NL80211_IFTYPE_ADHOC:
976 case NL80211_IFTYPE_MESH_POINT:
977 case NL80211_IFTYPE_OCB:
978 break;
979 default:
980 continue;
981 }
982
983 if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf)
984 continue;
985
986 if (link->sdata->vif.type == NL80211_IFTYPE_MONITOR) {
987 rx_chains_dynamic = rx_chains_static = local->rx_chains;
988 break;
989 }
990
991 switch (link->smps_mode) {
992 default:
993 WARN_ONCE(1, "Invalid SMPS mode %d\n",
994 link->smps_mode);
995 fallthrough;
996 case IEEE80211_SMPS_OFF:
997 needed_static = link->needed_rx_chains;
998 needed_dynamic = link->needed_rx_chains;
999 break;
1000 case IEEE80211_SMPS_DYNAMIC:
1001 needed_static = 1;
1002 needed_dynamic = link->needed_rx_chains;
1003 break;
1004 case IEEE80211_SMPS_STATIC:
1005 needed_static = 1;
1006 needed_dynamic = 1;
1007 break;
1008 }
1009
1010 rx_chains_static = max(rx_chains_static, needed_static);
1011 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
1012 }
1013
1014 /* Disable SMPS for the monitor interface */
1015 sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
1016 if (sdata &&
1017 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
1018 rx_chains_dynamic = rx_chains_static = local->rx_chains;
1019
1020 if (rx_chains_static == chanctx->conf.rx_chains_static &&
1021 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
1022 return;
1023
1024 chanctx->conf.rx_chains_static = rx_chains_static;
1025 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
1026 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
1027 }
1028
1029 static void
1030 __ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1031 bool clear)
1032 {
1033 struct ieee80211_sub_if_data *sdata = link->sdata;
1034 unsigned int link_id = link->link_id;
1035 struct ieee80211_bss_conf *link_conf = link->conf;
1036 struct ieee80211_local *local __maybe_unused = sdata->local;
1037 struct ieee80211_sub_if_data *vlan;
1038 struct ieee80211_chanctx_conf *conf;
1039
1040 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
1041 return;
1042
1043 lockdep_assert_wiphy(local->hw.wiphy);
1044
1045 /* Check that conf exists, even when clearing this function
1046 * must be called with the AP's channel context still there
1047 * as it would otherwise cause VLANs to have an invalid
1048 * channel context pointer for a while, possibly pointing
1049 * to a channel context that has already been freed.
1050 */
1051 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1052 lockdep_is_held(&local->hw.wiphy->mtx));
1053 WARN_ON(!conf);
1054
1055 if (clear)
1056 conf = NULL;
1057
1058 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1059 struct ieee80211_bss_conf *vlan_conf;
1060
1061 vlan_conf = wiphy_dereference(local->hw.wiphy,
1062 vlan->vif.link_conf[link_id]);
1063 if (WARN_ON(!vlan_conf))
1064 continue;
1065
1066 rcu_assign_pointer(vlan_conf->chanctx_conf, conf);
1067 }
1068 }
1069
1070 void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
1071 bool clear)
1072 {
1073 struct ieee80211_local *local = link->sdata->local;
1074
1075 lockdep_assert_wiphy(local->hw.wiphy);
1076
1077 __ieee80211_link_copy_chanctx_to_vlans(link, clear);
1078 }
1079
1080 int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
1081 {
1082 struct ieee80211_sub_if_data *sdata = link->sdata;
1083 struct ieee80211_chanctx *ctx = link->reserved_chanctx;
1084
1085 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1086
1087 if (WARN_ON(!ctx))
1088 return -EINVAL;
1089
1090 list_del(&link->reserved_chanctx_list);
1091 link->reserved_chanctx = NULL;
1092
1093 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
1094 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1095 if (WARN_ON(!ctx->replace_ctx))
1096 return -EINVAL;
1097
1098 WARN_ON(ctx->replace_ctx->replace_state !=
1099 IEEE80211_CHANCTX_WILL_BE_REPLACED);
1100 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
1101
1102 ctx->replace_ctx->replace_ctx = NULL;
1103 ctx->replace_ctx->replace_state =
1104 IEEE80211_CHANCTX_REPLACE_NONE;
1105
1106 list_del_rcu(&ctx->list);
1107 kfree_rcu(ctx, rcu_head);
1108 } else {
1109 ieee80211_free_chanctx(sdata->local, ctx, false);
1110 }
1111 }
1112
1113 return 0;
1114 }
1115
1116 static struct ieee80211_chanctx *
1117 ieee80211_replace_chanctx(struct ieee80211_local *local,
1118 const struct ieee80211_chan_req *chanreq,
1119 enum ieee80211_chanctx_mode mode,
1120 struct ieee80211_chanctx *curr_ctx)
1121 {
1122 struct ieee80211_chanctx *new_ctx, *ctx;
1123 struct wiphy *wiphy = local->hw.wiphy;
1124 const struct wiphy_radio *radio;
1125
1126 if (!curr_ctx || (curr_ctx->replace_state ==
1127 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1128 !list_empty(&curr_ctx->reserved_links)) {
1129 /*
1130 * Another link already requested this context for a
1131 * reservation. Find another one hoping all links assigned
1132 * to it will also switch soon enough.
1133 *
1134 * TODO: This needs a little more work as some cases
1135 * (more than 2 chanctx capable devices) may fail which could
1136 * otherwise succeed provided some channel context juggling was
1137 * performed.
1138 *
1139 * Consider ctx1..3, link1..6, each ctx has 2 links. link1 and
1140 * link2 from ctx1 request new different chandefs starting 2
1141 * in-place reservations with ctx4 and ctx5 replacing ctx1 and
1142 * ctx2 respectively. Next link5 and link6 from ctx3 reserve
1143 * ctx4. If link3 and link4 remain on ctx2 as they are then this
1144 * fails unless `replace_ctx` from ctx5 is replaced with ctx3.
1145 */
1146 list_for_each_entry(ctx, &local->chanctx_list, list) {
1147 if (ctx->replace_state !=
1148 IEEE80211_CHANCTX_REPLACE_NONE)
1149 continue;
1150
1151 if (!list_empty(&ctx->reserved_links))
1152 continue;
1153
1154 if (ctx->conf.radio_idx >= 0) {
1155 radio = &wiphy->radio[ctx->conf.radio_idx];
1156 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper))
1157 continue;
1158 }
1159
1160 curr_ctx = ctx;
1161 break;
1162 }
1163 }
1164
1165 /*
1166 * If that's true then all available contexts already have reservations
1167 * and cannot be used.
1168 */
1169 if (!curr_ctx || (curr_ctx->replace_state ==
1170 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1171 !list_empty(&curr_ctx->reserved_links))
1172 return ERR_PTR(-EBUSY);
1173
1174 new_ctx = ieee80211_alloc_chanctx(local, chanreq, mode, -1);
1175 if (!new_ctx)
1176 return ERR_PTR(-ENOMEM);
1177
1178 new_ctx->replace_ctx = curr_ctx;
1179 new_ctx->replace_state = IEEE80211_CHANCTX_REPLACES_OTHER;
1180
1181 curr_ctx->replace_ctx = new_ctx;
1182 curr_ctx->replace_state = IEEE80211_CHANCTX_WILL_BE_REPLACED;
1183
1184 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1185
1186 return new_ctx;
1187 }
1188
1189 static bool
1190 ieee80211_find_available_radio(struct ieee80211_local *local,
1191 const struct ieee80211_chan_req *chanreq,
1192 u32 radio_mask, int *radio_idx)
1193 {
1194 struct wiphy *wiphy = local->hw.wiphy;
1195 const struct wiphy_radio *radio;
1196 int i;
1197
1198 *radio_idx = -1;
1199 if (!wiphy->n_radio)
1200 return true;
1201
1202 for (i = 0; i < wiphy->n_radio; i++) {
1203 if (!(radio_mask & BIT(i)))
1204 continue;
1205
1206 radio = &wiphy->radio[i];
1207 if (!cfg80211_radio_chandef_valid(radio, &chanreq->oper))
1208 continue;
1209
1210 if (!ieee80211_can_create_new_chanctx(local, i))
1211 continue;
1212
1213 *radio_idx = i;
1214 return true;
1215 }
1216
1217 return false;
1218 }
1219
1220 int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
1221 const struct ieee80211_chan_req *chanreq,
1222 enum ieee80211_chanctx_mode mode,
1223 bool radar_required)
1224 {
1225 struct ieee80211_sub_if_data *sdata = link->sdata;
1226 struct ieee80211_local *local = sdata->local;
1227 struct ieee80211_chanctx *new_ctx, *curr_ctx;
1228 int radio_idx;
1229
1230 lockdep_assert_wiphy(local->hw.wiphy);
1231
1232 curr_ctx = ieee80211_link_get_chanctx(link);
1233 if (curr_ctx && !local->ops->switch_vif_chanctx)
1234 return -EOPNOTSUPP;
1235
1236 new_ctx = ieee80211_find_reservation_chanctx(local, chanreq, mode);
1237 if (!new_ctx) {
1238 if (ieee80211_can_create_new_chanctx(local, -1) &&
1239 ieee80211_find_available_radio(local, chanreq,
1240 sdata->wdev.radio_mask,
1241 &radio_idx))
1242 new_ctx = ieee80211_new_chanctx(local, chanreq, mode,
1243 false, radio_idx);
1244 else
1245 new_ctx = ieee80211_replace_chanctx(local, chanreq,
1246 mode, curr_ctx);
1247 if (IS_ERR(new_ctx))
1248 return PTR_ERR(new_ctx);
1249 }
1250
1251 list_add(&link->reserved_chanctx_list, &new_ctx->reserved_links);
1252 link->reserved_chanctx = new_ctx;
1253 link->reserved = *chanreq;
1254 link->reserved_radar_required = radar_required;
1255 link->reserved_ready = false;
1256
1257 return 0;
1258 }
1259
1260 static void
1261 ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link)
1262 {
1263 struct ieee80211_sub_if_data *sdata = link->sdata;
1264
1265 switch (sdata->vif.type) {
1266 case NL80211_IFTYPE_ADHOC:
1267 case NL80211_IFTYPE_AP:
1268 case NL80211_IFTYPE_MESH_POINT:
1269 case NL80211_IFTYPE_OCB:
1270 wiphy_work_queue(sdata->local->hw.wiphy,
1271 &link->csa.finalize_work);
1272 break;
1273 case NL80211_IFTYPE_STATION:
1274 wiphy_delayed_work_queue(sdata->local->hw.wiphy,
1275 &link->u.mgd.csa.switch_work, 0);
1276 break;
1277 case NL80211_IFTYPE_UNSPECIFIED:
1278 case NL80211_IFTYPE_AP_VLAN:
1279 case NL80211_IFTYPE_WDS:
1280 case NL80211_IFTYPE_MONITOR:
1281 case NL80211_IFTYPE_P2P_CLIENT:
1282 case NL80211_IFTYPE_P2P_GO:
1283 case NL80211_IFTYPE_P2P_DEVICE:
1284 case NL80211_IFTYPE_NAN:
1285 case NUM_NL80211_IFTYPES:
1286 WARN_ON(1);
1287 break;
1288 }
1289 }
1290
1291 static void
1292 ieee80211_link_update_chanreq(struct ieee80211_link_data *link,
1293 const struct ieee80211_chan_req *chanreq)
1294 {
1295 struct ieee80211_sub_if_data *sdata = link->sdata;
1296 unsigned int link_id = link->link_id;
1297 struct ieee80211_sub_if_data *vlan;
1298
1299 link->conf->chanreq = *chanreq;
1300
1301 if (sdata->vif.type != NL80211_IFTYPE_AP)
1302 return;
1303
1304 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
1305 struct ieee80211_bss_conf *vlan_conf;
1306
1307 vlan_conf = wiphy_dereference(sdata->local->hw.wiphy,
1308 vlan->vif.link_conf[link_id]);
1309 if (WARN_ON(!vlan_conf))
1310 continue;
1311
1312 vlan_conf->chanreq = *chanreq;
1313 }
1314 }
1315
1316 static int
1317 ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link)
1318 {
1319 struct ieee80211_sub_if_data *sdata = link->sdata;
1320 struct ieee80211_bss_conf *link_conf = link->conf;
1321 struct ieee80211_local *local = sdata->local;
1322 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1323 struct ieee80211_chanctx *old_ctx, *new_ctx;
1324 const struct ieee80211_chan_req *chanreq;
1325 struct ieee80211_chan_req tmp;
1326 u64 changed = 0;
1327 int err;
1328
1329 lockdep_assert_wiphy(local->hw.wiphy);
1330
1331 new_ctx = link->reserved_chanctx;
1332 old_ctx = ieee80211_link_get_chanctx(link);
1333
1334 if (WARN_ON(!link->reserved_ready))
1335 return -EBUSY;
1336
1337 if (WARN_ON(!new_ctx))
1338 return -EINVAL;
1339
1340 if (WARN_ON(!old_ctx))
1341 return -EINVAL;
1342
1343 if (WARN_ON(new_ctx->replace_state ==
1344 IEEE80211_CHANCTX_REPLACES_OTHER))
1345 return -EINVAL;
1346
1347 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1348 &link->reserved,
1349 &tmp);
1350 if (WARN_ON(!chanreq))
1351 return -EINVAL;
1352
1353 if (link_conf->chanreq.oper.width != link->reserved.oper.width)
1354 changed = BSS_CHANGED_BANDWIDTH;
1355
1356 ieee80211_link_update_chanreq(link, &link->reserved);
1357
1358 _ieee80211_change_chanctx(local, new_ctx, old_ctx, chanreq, link);
1359
1360 vif_chsw[0].vif = &sdata->vif;
1361 vif_chsw[0].old_ctx = &old_ctx->conf;
1362 vif_chsw[0].new_ctx = &new_ctx->conf;
1363 vif_chsw[0].link_conf = link->conf;
1364
1365 list_del(&link->reserved_chanctx_list);
1366 link->reserved_chanctx = NULL;
1367
1368 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1369 CHANCTX_SWMODE_REASSIGN_VIF);
1370 if (err) {
1371 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1372 ieee80211_free_chanctx(local, new_ctx, false);
1373
1374 goto out;
1375 }
1376
1377 list_move(&link->assigned_chanctx_list, &new_ctx->assigned_links);
1378 rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf);
1379
1380 if (sdata->vif.type == NL80211_IFTYPE_AP)
1381 __ieee80211_link_copy_chanctx_to_vlans(link, false);
1382
1383 ieee80211_check_fast_xmit_iface(sdata);
1384
1385 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1386 ieee80211_free_chanctx(local, old_ctx, false);
1387
1388 ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL, false);
1389 ieee80211_recalc_smps_chanctx(local, new_ctx);
1390 ieee80211_recalc_radar_chanctx(local, new_ctx);
1391
1392 if (changed)
1393 ieee80211_link_info_change_notify(sdata, link, changed);
1394
1395 out:
1396 ieee80211_link_chanctx_reservation_complete(link);
1397 return err;
1398 }
1399
1400 static int
1401 ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link)
1402 {
1403 struct ieee80211_sub_if_data *sdata = link->sdata;
1404 struct ieee80211_local *local = sdata->local;
1405 struct ieee80211_chanctx *old_ctx, *new_ctx;
1406 const struct ieee80211_chan_req *chanreq;
1407 struct ieee80211_chan_req tmp;
1408 int err;
1409
1410 old_ctx = ieee80211_link_get_chanctx(link);
1411 new_ctx = link->reserved_chanctx;
1412
1413 if (WARN_ON(!link->reserved_ready))
1414 return -EINVAL;
1415
1416 if (WARN_ON(old_ctx))
1417 return -EINVAL;
1418
1419 if (WARN_ON(!new_ctx))
1420 return -EINVAL;
1421
1422 if (WARN_ON(new_ctx->replace_state ==
1423 IEEE80211_CHANCTX_REPLACES_OTHER))
1424 return -EINVAL;
1425
1426 chanreq = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1427 &link->reserved,
1428 &tmp);
1429 if (WARN_ON(!chanreq))
1430 return -EINVAL;
1431
1432 ieee80211_change_chanctx(local, new_ctx, new_ctx, chanreq);
1433
1434 list_del(&link->reserved_chanctx_list);
1435 link->reserved_chanctx = NULL;
1436
1437 err = ieee80211_assign_link_chanctx(link, new_ctx, false);
1438 if (err) {
1439 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1440 ieee80211_free_chanctx(local, new_ctx, false);
1441
1442 goto out;
1443 }
1444
1445 out:
1446 ieee80211_link_chanctx_reservation_complete(link);
1447 return err;
1448 }
1449
1450 static bool
1451 ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link)
1452 {
1453 struct ieee80211_sub_if_data *sdata = link->sdata;
1454 struct ieee80211_chanctx *old_ctx, *new_ctx;
1455
1456 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1457
1458 new_ctx = link->reserved_chanctx;
1459 old_ctx = ieee80211_link_get_chanctx(link);
1460
1461 if (!old_ctx)
1462 return false;
1463
1464 if (WARN_ON(!new_ctx))
1465 return false;
1466
1467 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1468 return false;
1469
1470 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1471 return false;
1472
1473 return true;
1474 }
1475
1476 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1477 int n_vifs)
1478 {
1479 struct ieee80211_vif_chanctx_switch *vif_chsw;
1480 struct ieee80211_link_data *link;
1481 struct ieee80211_chanctx *ctx, *old_ctx;
1482 int i, err;
1483
1484 lockdep_assert_wiphy(local->hw.wiphy);
1485
1486 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1487 if (!vif_chsw)
1488 return -ENOMEM;
1489
1490 i = 0;
1491 list_for_each_entry(ctx, &local->chanctx_list, list) {
1492 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1493 continue;
1494
1495 if (WARN_ON(!ctx->replace_ctx)) {
1496 err = -EINVAL;
1497 goto out;
1498 }
1499
1500 list_for_each_entry(link, &ctx->reserved_links,
1501 reserved_chanctx_list) {
1502 if (!ieee80211_link_has_in_place_reservation(link))
1503 continue;
1504
1505 old_ctx = ieee80211_link_get_chanctx(link);
1506 vif_chsw[i].vif = &link->sdata->vif;
1507 vif_chsw[i].old_ctx = &old_ctx->conf;
1508 vif_chsw[i].new_ctx = &ctx->conf;
1509 vif_chsw[i].link_conf = link->conf;
1510
1511 i++;
1512 }
1513 }
1514
1515 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1516 CHANCTX_SWMODE_SWAP_CONTEXTS);
1517
1518 out:
1519 kfree(vif_chsw);
1520 return err;
1521 }
1522
1523 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1524 {
1525 struct ieee80211_chanctx *ctx;
1526 int err;
1527
1528 lockdep_assert_wiphy(local->hw.wiphy);
1529
1530 list_for_each_entry(ctx, &local->chanctx_list, list) {
1531 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1532 continue;
1533
1534 if (!list_empty(&ctx->replace_ctx->assigned_links))
1535 continue;
1536
1537 ieee80211_del_chanctx(local, ctx->replace_ctx, false);
1538 err = ieee80211_add_chanctx(local, ctx);
1539 if (err)
1540 goto err;
1541 }
1542
1543 return 0;
1544
1545 err:
1546 WARN_ON(ieee80211_add_chanctx(local, ctx));
1547 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1548 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1549 continue;
1550
1551 if (!list_empty(&ctx->replace_ctx->assigned_links))
1552 continue;
1553
1554 ieee80211_del_chanctx(local, ctx, false);
1555 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1556 }
1557
1558 return err;
1559 }
1560
1561 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1562 {
1563 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1564 int err, n_assigned, n_reserved, n_ready;
1565 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1566
1567 lockdep_assert_wiphy(local->hw.wiphy);
1568
1569 /*
1570 * If there are 2 independent pairs of channel contexts performing
1571 * cross-switch of their vifs this code will still wait until both are
1572 * ready even though it could be possible to switch one before the
1573 * other is ready.
1574 *
1575 * For practical reasons and code simplicity just do a single huge
1576 * switch.
1577 */
1578
1579 /*
1580 * Verify if the reservation is still feasible.
1581 * - if it's not then disconnect
1582 * - if it is but not all vifs necessary are ready then defer
1583 */
1584
1585 list_for_each_entry(ctx, &local->chanctx_list, list) {
1586 struct ieee80211_link_data *link;
1587
1588 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1589 continue;
1590
1591 if (WARN_ON(!ctx->replace_ctx)) {
1592 err = -EINVAL;
1593 goto err;
1594 }
1595
1596 n_ctx++;
1597
1598 n_assigned = 0;
1599 n_reserved = 0;
1600 n_ready = 0;
1601
1602 list_for_each_entry(link, &ctx->replace_ctx->assigned_links,
1603 assigned_chanctx_list) {
1604 n_assigned++;
1605 if (link->reserved_chanctx) {
1606 n_reserved++;
1607 if (link->reserved_ready)
1608 n_ready++;
1609 }
1610 }
1611
1612 if (n_assigned != n_reserved) {
1613 if (n_ready == n_reserved) {
1614 wiphy_info(local->hw.wiphy,
1615 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1616 err = -EBUSY;
1617 goto err;
1618 }
1619
1620 return -EAGAIN;
1621 }
1622
1623 ctx->conf.radar_enabled = false;
1624 list_for_each_entry(link, &ctx->reserved_links,
1625 reserved_chanctx_list) {
1626 if (ieee80211_link_has_in_place_reservation(link) &&
1627 !link->reserved_ready)
1628 return -EAGAIN;
1629
1630 old_ctx = ieee80211_link_get_chanctx(link);
1631 if (old_ctx) {
1632 if (old_ctx->replace_state ==
1633 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1634 n_vifs_switch++;
1635 else
1636 n_vifs_assign++;
1637 } else {
1638 n_vifs_ctxless++;
1639 }
1640
1641 if (link->reserved_radar_required)
1642 ctx->conf.radar_enabled = true;
1643 }
1644 }
1645
1646 if (WARN_ON(n_ctx == 0) ||
1647 WARN_ON(n_vifs_switch == 0 &&
1648 n_vifs_assign == 0 &&
1649 n_vifs_ctxless == 0)) {
1650 err = -EINVAL;
1651 goto err;
1652 }
1653
1654 /* update station rate control and min width before switch */
1655 list_for_each_entry(ctx, &local->chanctx_list, list) {
1656 struct ieee80211_link_data *link;
1657
1658 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1659 continue;
1660
1661 if (WARN_ON(!ctx->replace_ctx)) {
1662 err = -EINVAL;
1663 goto err;
1664 }
1665
1666 list_for_each_entry(link, &ctx->reserved_links,
1667 reserved_chanctx_list) {
1668 if (!ieee80211_link_has_in_place_reservation(link))
1669 continue;
1670
1671 ieee80211_chan_bw_change(local,
1672 ieee80211_link_get_chanctx(link),
1673 true, true);
1674 }
1675
1676 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, true);
1677 }
1678
1679 /*
1680 * All necessary vifs are ready. Perform the switch now depending on
1681 * reservations and driver capabilities.
1682 */
1683
1684 if (n_vifs_switch > 0) {
1685 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1686 if (err)
1687 goto err;
1688 }
1689
1690 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1691 err = ieee80211_chsw_switch_ctxs(local);
1692 if (err)
1693 goto err;
1694 }
1695
1696 /*
1697 * Update all structures, values and pointers to point to new channel
1698 * context(s).
1699 */
1700 list_for_each_entry(ctx, &local->chanctx_list, list) {
1701 struct ieee80211_link_data *link, *link_tmp;
1702
1703 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1704 continue;
1705
1706 if (WARN_ON(!ctx->replace_ctx)) {
1707 err = -EINVAL;
1708 goto err;
1709 }
1710
1711 list_for_each_entry(link, &ctx->reserved_links,
1712 reserved_chanctx_list) {
1713 struct ieee80211_sub_if_data *sdata = link->sdata;
1714 struct ieee80211_bss_conf *link_conf = link->conf;
1715 u64 changed = 0;
1716
1717 if (!ieee80211_link_has_in_place_reservation(link))
1718 continue;
1719
1720 rcu_assign_pointer(link_conf->chanctx_conf,
1721 &ctx->conf);
1722
1723 if (sdata->vif.type == NL80211_IFTYPE_AP)
1724 __ieee80211_link_copy_chanctx_to_vlans(link,
1725 false);
1726
1727 ieee80211_check_fast_xmit_iface(sdata);
1728
1729 link->radar_required = link->reserved_radar_required;
1730
1731 if (link_conf->chanreq.oper.width != link->reserved.oper.width)
1732 changed = BSS_CHANGED_BANDWIDTH;
1733
1734 ieee80211_link_update_chanreq(link, &link->reserved);
1735 if (changed)
1736 ieee80211_link_info_change_notify(sdata,
1737 link,
1738 changed);
1739
1740 ieee80211_recalc_txpower(link, false);
1741 }
1742
1743 ieee80211_recalc_chanctx_chantype(local, ctx);
1744 ieee80211_recalc_smps_chanctx(local, ctx);
1745 ieee80211_recalc_radar_chanctx(local, ctx);
1746 ieee80211_recalc_chanctx_min_def(local, ctx, NULL, false);
1747
1748 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1749 reserved_chanctx_list) {
1750 if (ieee80211_link_get_chanctx(link) != ctx)
1751 continue;
1752
1753 list_del(&link->reserved_chanctx_list);
1754 list_move(&link->assigned_chanctx_list,
1755 &ctx->assigned_links);
1756 link->reserved_chanctx = NULL;
1757
1758 ieee80211_link_chanctx_reservation_complete(link);
1759 ieee80211_chan_bw_change(local, ctx, false, false);
1760 }
1761
1762 /*
1763 * This context might have been a dependency for an already
1764 * ready re-assign reservation interface that was deferred. Do
1765 * not propagate error to the caller though. The in-place
1766 * reservation for originally requested interface has already
1767 * succeeded at this point.
1768 */
1769 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1770 reserved_chanctx_list) {
1771 if (WARN_ON(ieee80211_link_has_in_place_reservation(link)))
1772 continue;
1773
1774 if (WARN_ON(link->reserved_chanctx != ctx))
1775 continue;
1776
1777 if (!link->reserved_ready)
1778 continue;
1779
1780 if (ieee80211_link_get_chanctx(link))
1781 err = ieee80211_link_use_reserved_reassign(link);
1782 else
1783 err = ieee80211_link_use_reserved_assign(link);
1784
1785 if (err) {
1786 link_info(link,
1787 "failed to finalize (re-)assign reservation (err=%d)\n",
1788 err);
1789 ieee80211_link_unreserve_chanctx(link);
1790 cfg80211_stop_iface(local->hw.wiphy,
1791 &link->sdata->wdev,
1792 GFP_KERNEL);
1793 }
1794 }
1795 }
1796
1797 /*
1798 * Finally free old contexts
1799 */
1800
1801 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1802 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1803 continue;
1804
1805 ctx->replace_ctx->replace_ctx = NULL;
1806 ctx->replace_ctx->replace_state =
1807 IEEE80211_CHANCTX_REPLACE_NONE;
1808
1809 list_del_rcu(&ctx->list);
1810 kfree_rcu(ctx, rcu_head);
1811 }
1812
1813 return 0;
1814
1815 err:
1816 list_for_each_entry(ctx, &local->chanctx_list, list) {
1817 struct ieee80211_link_data *link, *link_tmp;
1818
1819 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1820 continue;
1821
1822 list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links,
1823 reserved_chanctx_list) {
1824 ieee80211_link_unreserve_chanctx(link);
1825 ieee80211_link_chanctx_reservation_complete(link);
1826 }
1827 }
1828
1829 return err;
1830 }
1831
1832 void __ieee80211_link_release_channel(struct ieee80211_link_data *link,
1833 bool skip_idle_recalc)
1834 {
1835 struct ieee80211_sub_if_data *sdata = link->sdata;
1836 struct ieee80211_bss_conf *link_conf = link->conf;
1837 struct ieee80211_local *local = sdata->local;
1838 struct ieee80211_chanctx_conf *conf;
1839 struct ieee80211_chanctx *ctx;
1840 bool use_reserved_switch = false;
1841
1842 lockdep_assert_wiphy(local->hw.wiphy);
1843
1844 conf = rcu_dereference_protected(link_conf->chanctx_conf,
1845 lockdep_is_held(&local->hw.wiphy->mtx));
1846 if (!conf)
1847 return;
1848
1849 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1850
1851 if (link->reserved_chanctx) {
1852 if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
1853 ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1)
1854 use_reserved_switch = true;
1855
1856 ieee80211_link_unreserve_chanctx(link);
1857 }
1858
1859 ieee80211_assign_link_chanctx(link, NULL, false);
1860 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1861 ieee80211_free_chanctx(local, ctx, skip_idle_recalc);
1862
1863 link->radar_required = false;
1864
1865 /* Unreserving may ready an in-place reservation. */
1866 if (use_reserved_switch)
1867 ieee80211_vif_use_reserved_switch(local);
1868 }
1869
1870 int _ieee80211_link_use_channel(struct ieee80211_link_data *link,
1871 const struct ieee80211_chan_req *chanreq,
1872 enum ieee80211_chanctx_mode mode,
1873 bool assign_on_failure)
1874 {
1875 struct ieee80211_sub_if_data *sdata = link->sdata;
1876 struct ieee80211_local *local = sdata->local;
1877 struct ieee80211_chanctx *ctx;
1878 u8 radar_detect_width = 0;
1879 bool reserved = false;
1880 int radio_idx;
1881 int ret;
1882
1883 lockdep_assert_wiphy(local->hw.wiphy);
1884
1885 if (!ieee80211_vif_link_active(&sdata->vif, link->link_id)) {
1886 ieee80211_link_update_chanreq(link, chanreq);
1887 return 0;
1888 }
1889
1890 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1891 &chanreq->oper,
1892 sdata->wdev.iftype);
1893 if (ret < 0)
1894 goto out;
1895 if (ret > 0)
1896 radar_detect_width = BIT(chanreq->oper.width);
1897
1898 link->radar_required = ret;
1899
1900 ret = ieee80211_check_combinations(sdata, &chanreq->oper, mode,
1901 radar_detect_width, -1);
1902 if (ret < 0)
1903 goto out;
1904
1905 __ieee80211_link_release_channel(link, false);
1906
1907 ctx = ieee80211_find_chanctx(local, link, chanreq, mode);
1908 /* Note: context is now reserved */
1909 if (ctx)
1910 reserved = true;
1911 else if (!ieee80211_find_available_radio(local, chanreq,
1912 sdata->wdev.radio_mask,
1913 &radio_idx))
1914 ctx = ERR_PTR(-EBUSY);
1915 else
1916 ctx = ieee80211_new_chanctx(local, chanreq, mode,
1917 assign_on_failure, radio_idx);
1918 if (IS_ERR(ctx)) {
1919 ret = PTR_ERR(ctx);
1920 goto out;
1921 }
1922
1923 ieee80211_link_update_chanreq(link, chanreq);
1924
1925 ret = ieee80211_assign_link_chanctx(link, ctx, assign_on_failure);
1926
1927 if (reserved) {
1928 /* remove reservation */
1929 WARN_ON(link->reserved_chanctx != ctx);
1930 link->reserved_chanctx = NULL;
1931 list_del(&link->reserved_chanctx_list);
1932 }
1933
1934 if (ret) {
1935 /* if assign fails refcount stays the same */
1936 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1937 ieee80211_free_chanctx(local, ctx, false);
1938 goto out;
1939 }
1940
1941 ieee80211_recalc_smps_chanctx(local, ctx);
1942 ieee80211_recalc_radar_chanctx(local, ctx);
1943 out:
1944 if (ret)
1945 link->radar_required = false;
1946
1947 return ret;
1948 }
1949
1950 int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link)
1951 {
1952 struct ieee80211_sub_if_data *sdata = link->sdata;
1953 struct ieee80211_local *local = sdata->local;
1954 struct ieee80211_chanctx *new_ctx;
1955 struct ieee80211_chanctx *old_ctx;
1956 int err;
1957
1958 lockdep_assert_wiphy(local->hw.wiphy);
1959
1960 new_ctx = link->reserved_chanctx;
1961 old_ctx = ieee80211_link_get_chanctx(link);
1962
1963 if (WARN_ON(!new_ctx))
1964 return -EINVAL;
1965
1966 if (WARN_ON(new_ctx->replace_state ==
1967 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1968 return -EINVAL;
1969
1970 if (WARN_ON(link->reserved_ready))
1971 return -EINVAL;
1972
1973 link->reserved_ready = true;
1974
1975 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1976 if (old_ctx)
1977 return ieee80211_link_use_reserved_reassign(link);
1978
1979 return ieee80211_link_use_reserved_assign(link);
1980 }
1981
1982 /*
1983 * In-place reservation may need to be finalized now either if:
1984 * a) sdata is taking part in the swapping itself and is the last one
1985 * b) sdata has switched with a re-assign reservation to an existing
1986 * context readying in-place switching of old_ctx
1987 *
1988 * In case of (b) do not propagate the error up because the requested
1989 * sdata already switched successfully. Just spill an extra warning.
1990 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1991 * interfaces upon failure.
1992 */
1993 if ((old_ctx &&
1994 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1995 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1996 err = ieee80211_vif_use_reserved_switch(local);
1997 if (err && err != -EAGAIN) {
1998 if (new_ctx->replace_state ==
1999 IEEE80211_CHANCTX_REPLACES_OTHER)
2000 return err;
2001
2002 wiphy_info(local->hw.wiphy,
2003 "depending in-place reservation failed (err=%d)\n",
2004 err);
2005 }
2006 }
2007
2008 return 0;
2009 }
2010
2011 /*
2012 * This is similar to ieee80211_chanctx_compatible(), but rechecks
2013 * against all the links actually using it (except the one that's
2014 * passed, since that one is changing).
2015 * This is done in order to allow changes to the AP's bandwidth for
2016 * wider bandwidth OFDMA purposes, which wouldn't be treated as
2017 * compatible by ieee80211_chanctx_recheck() but is OK if the link
2018 * requesting the update is the only one using it.
2019 */
2020 static const struct ieee80211_chan_req *
2021 ieee80211_chanctx_recheck(struct ieee80211_local *local,
2022 struct ieee80211_link_data *skip_link,
2023 struct ieee80211_chanctx *ctx,
2024 const struct ieee80211_chan_req *req,
2025 struct ieee80211_chan_req *tmp)
2026 {
2027 const struct ieee80211_chan_req *ret = req;
2028 struct ieee80211_link_data *link;
2029
2030 lockdep_assert_wiphy(local->hw.wiphy);
2031
2032 for_each_sdata_link(local, link) {
2033 if (link == skip_link)
2034 continue;
2035
2036 if (rcu_access_pointer(link->conf->chanctx_conf) == &ctx->conf) {
2037 ret = ieee80211_chanreq_compatible(ret,
2038 &link->conf->chanreq,
2039 tmp);
2040 if (!ret)
2041 return NULL;
2042 }
2043
2044 if (link->reserved_chanctx == ctx) {
2045 ret = ieee80211_chanreq_compatible(ret,
2046 &link->reserved,
2047 tmp);
2048 if (!ret)
2049 return NULL;
2050 }
2051 }
2052
2053 *tmp = *ret;
2054 return tmp;
2055 }
2056
2057 int ieee80211_link_change_chanreq(struct ieee80211_link_data *link,
2058 const struct ieee80211_chan_req *chanreq,
2059 u64 *changed)
2060 {
2061 struct ieee80211_sub_if_data *sdata = link->sdata;
2062 struct ieee80211_bss_conf *link_conf = link->conf;
2063 struct ieee80211_local *local = sdata->local;
2064 struct ieee80211_chanctx_conf *conf;
2065 struct ieee80211_chanctx *ctx;
2066 const struct ieee80211_chan_req *compat;
2067 struct ieee80211_chan_req tmp;
2068
2069 lockdep_assert_wiphy(local->hw.wiphy);
2070
2071 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy,
2072 &chanreq->oper,
2073 IEEE80211_CHAN_DISABLED))
2074 return -EINVAL;
2075
2076 /* for non-HT 20 MHz the rest doesn't matter */
2077 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT &&
2078 cfg80211_chandef_identical(&chanreq->oper, &link_conf->chanreq.oper))
2079 return 0;
2080
2081 /* but you cannot switch to/from it */
2082 if (chanreq->oper.width == NL80211_CHAN_WIDTH_20_NOHT ||
2083 link_conf->chanreq.oper.width == NL80211_CHAN_WIDTH_20_NOHT)
2084 return -EINVAL;
2085
2086 conf = rcu_dereference_protected(link_conf->chanctx_conf,
2087 lockdep_is_held(&local->hw.wiphy->mtx));
2088 if (!conf)
2089 return -EINVAL;
2090
2091 ctx = container_of(conf, struct ieee80211_chanctx, conf);
2092
2093 compat = ieee80211_chanctx_recheck(local, link, ctx, chanreq, &tmp);
2094 if (!compat)
2095 return -EINVAL;
2096
2097 switch (ctx->replace_state) {
2098 case IEEE80211_CHANCTX_REPLACE_NONE:
2099 if (!ieee80211_chanctx_reserved_chanreq(local, ctx, compat,
2100 &tmp))
2101 return -EBUSY;
2102 break;
2103 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
2104 /* TODO: Perhaps the bandwidth change could be treated as a
2105 * reservation itself? */
2106 return -EBUSY;
2107 case IEEE80211_CHANCTX_REPLACES_OTHER:
2108 /* channel context that is going to replace another channel
2109 * context doesn't really exist and shouldn't be assigned
2110 * anywhere yet */
2111 WARN_ON(1);
2112 break;
2113 }
2114
2115 ieee80211_link_update_chanreq(link, chanreq);
2116
2117 ieee80211_recalc_chanctx_chantype(local, ctx);
2118
2119 *changed |= BSS_CHANGED_BANDWIDTH;
2120 return 0;
2121 }
2122
2123 void ieee80211_link_release_channel(struct ieee80211_link_data *link)
2124 {
2125 struct ieee80211_sub_if_data *sdata = link->sdata;
2126
2127 lockdep_assert_wiphy(sdata->local->hw.wiphy);
2128
2129 if (rcu_access_pointer(link->conf->chanctx_conf))
2130 __ieee80211_link_release_channel(link, false);
2131 }
2132
2133 void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link)
2134 {
2135 struct ieee80211_sub_if_data *sdata = link->sdata;
2136 unsigned int link_id = link->link_id;
2137 struct ieee80211_bss_conf *link_conf = link->conf;
2138 struct ieee80211_bss_conf *ap_conf;
2139 struct ieee80211_local *local = sdata->local;
2140 struct ieee80211_sub_if_data *ap;
2141 struct ieee80211_chanctx_conf *conf;
2142
2143 lockdep_assert_wiphy(local->hw.wiphy);
2144
2145 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
2146 return;
2147
2148 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
2149
2150 ap_conf = wiphy_dereference(local->hw.wiphy,
2151 ap->vif.link_conf[link_id]);
2152 conf = wiphy_dereference(local->hw.wiphy,
2153 ap_conf->chanctx_conf);
2154 rcu_assign_pointer(link_conf->chanctx_conf, conf);
2155 }
2156
2157 void ieee80211_iter_chan_contexts_atomic(
2158 struct ieee80211_hw *hw,
2159 void (*iter)(struct ieee80211_hw *hw,
2160 struct ieee80211_chanctx_conf *chanctx_conf,
2161 void *data),
2162 void *iter_data)
2163 {
2164 struct ieee80211_local *local = hw_to_local(hw);
2165 struct ieee80211_chanctx *ctx;
2166
2167 rcu_read_lock();
2168 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
2169 if (ctx->driver_present)
2170 iter(hw, &ctx->conf, iter_data);
2171 rcu_read_unlock();
2172 }
2173 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
Kernel DRM miscellaneous fixes and cross-tree changes