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Linux 5.7.7
[linux/fpc-iii.git] / net / mac80211 / chan.c
blob9c94baaf693cbb531e57fafdf26144667a4fe68a
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mac80211 - channel management
4 */
5
6 #include <linux/nl80211.h>
7 #include <linux/export.h>
8 #include <linux/rtnetlink.h>
9 #include <net/cfg80211.h>
10 #include "ieee80211_i.h"
11 #include "driver-ops.h"
12
13 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
14 struct ieee80211_chanctx *ctx)
15 {
16 struct ieee80211_sub_if_data *sdata;
17 int num = 0;
18
19 lockdep_assert_held(&local->chanctx_mtx);
20
21 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
22 num++;
23
24 return num;
25 }
26
27 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
28 struct ieee80211_chanctx *ctx)
29 {
30 struct ieee80211_sub_if_data *sdata;
31 int num = 0;
32
33 lockdep_assert_held(&local->chanctx_mtx);
34
35 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
36 num++;
37
38 return num;
39 }
40
41 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
42 struct ieee80211_chanctx *ctx)
43 {
44 return ieee80211_chanctx_num_assigned(local, ctx) +
45 ieee80211_chanctx_num_reserved(local, ctx);
46 }
47
48 static int ieee80211_num_chanctx(struct ieee80211_local *local)
49 {
50 struct ieee80211_chanctx *ctx;
51 int num = 0;
52
53 lockdep_assert_held(&local->chanctx_mtx);
54
55 list_for_each_entry(ctx, &local->chanctx_list, list)
56 num++;
57
58 return num;
59 }
60
61 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
62 {
63 lockdep_assert_held(&local->chanctx_mtx);
64 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
65 }
66
67 static struct ieee80211_chanctx *
68 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
69 {
70 struct ieee80211_local *local __maybe_unused = sdata->local;
71 struct ieee80211_chanctx_conf *conf;
72
73 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
74 lockdep_is_held(&local->chanctx_mtx));
75 if (!conf)
76 return NULL;
77
78 return container_of(conf, struct ieee80211_chanctx, conf);
79 }
80
81 static const struct cfg80211_chan_def *
82 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
83 struct ieee80211_chanctx *ctx,
84 const struct cfg80211_chan_def *compat)
85 {
86 struct ieee80211_sub_if_data *sdata;
87
88 lockdep_assert_held(&local->chanctx_mtx);
89
90 list_for_each_entry(sdata, &ctx->reserved_vifs,
91 reserved_chanctx_list) {
92 if (!compat)
93 compat = &sdata->reserved_chandef;
94
95 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
96 compat);
97 if (!compat)
98 break;
99 }
100
101 return compat;
102 }
103
104 static const struct cfg80211_chan_def *
105 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
106 struct ieee80211_chanctx *ctx,
107 const struct cfg80211_chan_def *compat)
108 {
109 struct ieee80211_sub_if_data *sdata;
110
111 lockdep_assert_held(&local->chanctx_mtx);
112
113 list_for_each_entry(sdata, &ctx->assigned_vifs,
114 assigned_chanctx_list) {
115 if (sdata->reserved_chanctx != NULL)
116 continue;
117
118 if (!compat)
119 compat = &sdata->vif.bss_conf.chandef;
120
121 compat = cfg80211_chandef_compatible(
122 &sdata->vif.bss_conf.chandef, compat);
123 if (!compat)
124 break;
125 }
126
127 return compat;
128 }
129
130 static const struct cfg80211_chan_def *
131 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
132 struct ieee80211_chanctx *ctx,
133 const struct cfg80211_chan_def *compat)
134 {
135 lockdep_assert_held(&local->chanctx_mtx);
136
137 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
138 if (!compat)
139 return NULL;
140
141 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
142 if (!compat)
143 return NULL;
144
145 return compat;
146 }
147
148 static bool
149 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
150 struct ieee80211_chanctx *ctx,
151 const struct cfg80211_chan_def *def)
152 {
153 lockdep_assert_held(&local->chanctx_mtx);
154
155 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
156 return true;
157
158 if (!list_empty(&ctx->reserved_vifs) &&
159 ieee80211_chanctx_reserved_chandef(local, ctx, def))
160 return true;
161
162 return false;
163 }
164
165 static struct ieee80211_chanctx *
166 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
167 const struct cfg80211_chan_def *chandef,
168 enum ieee80211_chanctx_mode mode)
169 {
170 struct ieee80211_chanctx *ctx;
171
172 lockdep_assert_held(&local->chanctx_mtx);
173
174 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
175 return NULL;
176
177 list_for_each_entry(ctx, &local->chanctx_list, list) {
178 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
179 continue;
180
181 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
182 continue;
183
184 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
185 chandef))
186 continue;
187
188 return ctx;
189 }
190
191 return NULL;
192 }
193
194 enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
195 {
196 switch (sta->bandwidth) {
197 case IEEE80211_STA_RX_BW_20:
198 if (sta->ht_cap.ht_supported)
199 return NL80211_CHAN_WIDTH_20;
200 else
201 return NL80211_CHAN_WIDTH_20_NOHT;
202 case IEEE80211_STA_RX_BW_40:
203 return NL80211_CHAN_WIDTH_40;
204 case IEEE80211_STA_RX_BW_80:
205 return NL80211_CHAN_WIDTH_80;
206 case IEEE80211_STA_RX_BW_160:
207 /*
208 * This applied for both 160 and 80+80. since we use
209 * the returned value to consider degradation of
210 * ctx->conf.min_def, we have to make sure to take
211 * the bigger one (NL80211_CHAN_WIDTH_160).
212 * Otherwise we might try degrading even when not
213 * needed, as the max required sta_bw returned (80+80)
214 * might be smaller than the configured bw (160).
215 */
216 return NL80211_CHAN_WIDTH_160;
217 default:
218 WARN_ON(1);
219 return NL80211_CHAN_WIDTH_20;
220 }
221 }
222
223 static enum nl80211_chan_width
224 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
225 {
226 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
227 struct sta_info *sta;
228
229 rcu_read_lock();
230 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
231 if (sdata != sta->sdata &&
232 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
233 continue;
234
235 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
236 }
237 rcu_read_unlock();
238
239 return max_bw;
240 }
241
242 static enum nl80211_chan_width
243 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
244 struct ieee80211_chanctx_conf *conf)
245 {
246 struct ieee80211_sub_if_data *sdata;
247 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
248
249 rcu_read_lock();
250 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
251 struct ieee80211_vif *vif = &sdata->vif;
252 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
253
254 if (!ieee80211_sdata_running(sdata))
255 continue;
256
257 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
258 continue;
259
260 switch (vif->type) {
261 case NL80211_IFTYPE_AP:
262 case NL80211_IFTYPE_AP_VLAN:
263 width = ieee80211_get_max_required_bw(sdata);
264 break;
265 case NL80211_IFTYPE_STATION:
266 /*
267 * The ap's sta->bandwidth is not set yet at this
268 * point, so take the width from the chandef, but
269 * account also for TDLS peers
270 */
271 width = max(vif->bss_conf.chandef.width,
272 ieee80211_get_max_required_bw(sdata));
273 break;
274 case NL80211_IFTYPE_P2P_DEVICE:
275 case NL80211_IFTYPE_NAN:
276 continue;
277 case NL80211_IFTYPE_ADHOC:
278 case NL80211_IFTYPE_WDS:
279 case NL80211_IFTYPE_MESH_POINT:
280 case NL80211_IFTYPE_OCB:
281 width = vif->bss_conf.chandef.width;
282 break;
283 case NL80211_IFTYPE_UNSPECIFIED:
284 case NUM_NL80211_IFTYPES:
285 case NL80211_IFTYPE_MONITOR:
286 case NL80211_IFTYPE_P2P_CLIENT:
287 case NL80211_IFTYPE_P2P_GO:
288 WARN_ON_ONCE(1);
289 }
290 max_bw = max(max_bw, width);
291 }
292
293 /* use the configured bandwidth in case of monitor interface */
294 sdata = rcu_dereference(local->monitor_sdata);
295 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
296 max_bw = max(max_bw, conf->def.width);
297
298 rcu_read_unlock();
299
300 return max_bw;
301 }
302
303 /*
304 * recalc the min required chan width of the channel context, which is
305 * the max of min required widths of all the interfaces bound to this
306 * channel context.
307 */
308 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
309 struct ieee80211_chanctx *ctx)
310 {
311 enum nl80211_chan_width max_bw;
312 struct cfg80211_chan_def min_def;
313
314 lockdep_assert_held(&local->chanctx_mtx);
315
316 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
317 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
318 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
319 ctx->conf.radar_enabled) {
320 ctx->conf.min_def = ctx->conf.def;
321 return;
322 }
323
324 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
325
326 /* downgrade chandef up to max_bw */
327 min_def = ctx->conf.def;
328 while (min_def.width > max_bw)
329 ieee80211_chandef_downgrade(&min_def);
330
331 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
332 return;
333
334 ctx->conf.min_def = min_def;
335 if (!ctx->driver_present)
336 return;
337
338 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
339 }
340
341 static void ieee80211_change_chanctx(struct ieee80211_local *local,
342 struct ieee80211_chanctx *ctx,
343 const struct cfg80211_chan_def *chandef)
344 {
345 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
346 ieee80211_recalc_chanctx_min_def(local, ctx);
347 return;
348 }
349
350 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
351
352 ctx->conf.def = *chandef;
353 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
354 ieee80211_recalc_chanctx_min_def(local, ctx);
355
356 if (!local->use_chanctx) {
357 local->_oper_chandef = *chandef;
358 ieee80211_hw_config(local, 0);
359 }
360 }
361
362 static struct ieee80211_chanctx *
363 ieee80211_find_chanctx(struct ieee80211_local *local,
364 const struct cfg80211_chan_def *chandef,
365 enum ieee80211_chanctx_mode mode)
366 {
367 struct ieee80211_chanctx *ctx;
368
369 lockdep_assert_held(&local->chanctx_mtx);
370
371 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
372 return NULL;
373
374 list_for_each_entry(ctx, &local->chanctx_list, list) {
375 const struct cfg80211_chan_def *compat;
376
377 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
378 continue;
379
380 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
381 continue;
382
383 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
384 if (!compat)
385 continue;
386
387 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
388 compat);
389 if (!compat)
390 continue;
391
392 ieee80211_change_chanctx(local, ctx, compat);
393
394 return ctx;
395 }
396
397 return NULL;
398 }
399
400 bool ieee80211_is_radar_required(struct ieee80211_local *local)
401 {
402 struct ieee80211_sub_if_data *sdata;
403
404 lockdep_assert_held(&local->mtx);
405
406 rcu_read_lock();
407 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
408 if (sdata->radar_required) {
409 rcu_read_unlock();
410 return true;
411 }
412 }
413 rcu_read_unlock();
414
415 return false;
416 }
417
418 static bool
419 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
420 struct ieee80211_chanctx *ctx)
421 {
422 struct ieee80211_chanctx_conf *conf = &ctx->conf;
423 struct ieee80211_sub_if_data *sdata;
424 bool required = false;
425
426 lockdep_assert_held(&local->chanctx_mtx);
427 lockdep_assert_held(&local->mtx);
428
429 rcu_read_lock();
430 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
431 if (!ieee80211_sdata_running(sdata))
432 continue;
433 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
434 continue;
435 if (!sdata->radar_required)
436 continue;
437
438 required = true;
439 break;
440 }
441 rcu_read_unlock();
442
443 return required;
444 }
445
446 static struct ieee80211_chanctx *
447 ieee80211_alloc_chanctx(struct ieee80211_local *local,
448 const struct cfg80211_chan_def *chandef,
449 enum ieee80211_chanctx_mode mode)
450 {
451 struct ieee80211_chanctx *ctx;
452
453 lockdep_assert_held(&local->chanctx_mtx);
454
455 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
456 if (!ctx)
457 return NULL;
458
459 INIT_LIST_HEAD(&ctx->assigned_vifs);
460 INIT_LIST_HEAD(&ctx->reserved_vifs);
461 ctx->conf.def = *chandef;
462 ctx->conf.rx_chains_static = 1;
463 ctx->conf.rx_chains_dynamic = 1;
464 ctx->mode = mode;
465 ctx->conf.radar_enabled = false;
466 ieee80211_recalc_chanctx_min_def(local, ctx);
467
468 return ctx;
469 }
470
471 static int ieee80211_add_chanctx(struct ieee80211_local *local,
472 struct ieee80211_chanctx *ctx)
473 {
474 u32 changed;
475 int err;
476
477 lockdep_assert_held(&local->mtx);
478 lockdep_assert_held(&local->chanctx_mtx);
479
480 if (!local->use_chanctx)
481 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
482
483 /* turn idle off *before* setting channel -- some drivers need that */
484 changed = ieee80211_idle_off(local);
485 if (changed)
486 ieee80211_hw_config(local, changed);
487
488 if (!local->use_chanctx) {
489 local->_oper_chandef = ctx->conf.def;
490 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
491 } else {
492 err = drv_add_chanctx(local, ctx);
493 if (err) {
494 ieee80211_recalc_idle(local);
495 return err;
496 }
497 }
498
499 return 0;
500 }
501
502 static struct ieee80211_chanctx *
503 ieee80211_new_chanctx(struct ieee80211_local *local,
504 const struct cfg80211_chan_def *chandef,
505 enum ieee80211_chanctx_mode mode)
506 {
507 struct ieee80211_chanctx *ctx;
508 int err;
509
510 lockdep_assert_held(&local->mtx);
511 lockdep_assert_held(&local->chanctx_mtx);
512
513 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
514 if (!ctx)
515 return ERR_PTR(-ENOMEM);
516
517 err = ieee80211_add_chanctx(local, ctx);
518 if (err) {
519 kfree(ctx);
520 return ERR_PTR(err);
521 }
522
523 list_add_rcu(&ctx->list, &local->chanctx_list);
524 return ctx;
525 }
526
527 static void ieee80211_del_chanctx(struct ieee80211_local *local,
528 struct ieee80211_chanctx *ctx)
529 {
530 lockdep_assert_held(&local->chanctx_mtx);
531
532 if (!local->use_chanctx) {
533 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
534 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
535 chandef->center_freq1 = chandef->chan->center_freq;
536 chandef->center_freq2 = 0;
537
538 /* NOTE: Disabling radar is only valid here for
539 * single channel context. To be sure, check it ...
540 */
541 WARN_ON(local->hw.conf.radar_enabled &&
542 !list_empty(&local->chanctx_list));
543
544 local->hw.conf.radar_enabled = false;
545
546 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
547 } else {
548 drv_remove_chanctx(local, ctx);
549 }
550
551 ieee80211_recalc_idle(local);
552 }
553
554 static void ieee80211_free_chanctx(struct ieee80211_local *local,
555 struct ieee80211_chanctx *ctx)
556 {
557 lockdep_assert_held(&local->chanctx_mtx);
558
559 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
560
561 list_del_rcu(&ctx->list);
562 ieee80211_del_chanctx(local, ctx);
563 kfree_rcu(ctx, rcu_head);
564 }
565
566 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
567 struct ieee80211_chanctx *ctx)
568 {
569 struct ieee80211_chanctx_conf *conf = &ctx->conf;
570 struct ieee80211_sub_if_data *sdata;
571 const struct cfg80211_chan_def *compat = NULL;
572 struct sta_info *sta;
573
574 lockdep_assert_held(&local->chanctx_mtx);
575
576 rcu_read_lock();
577 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
578
579 if (!ieee80211_sdata_running(sdata))
580 continue;
581 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
582 continue;
583 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
584 continue;
585
586 if (!compat)
587 compat = &sdata->vif.bss_conf.chandef;
588
589 compat = cfg80211_chandef_compatible(
590 &sdata->vif.bss_conf.chandef, compat);
591 if (WARN_ON_ONCE(!compat))
592 break;
593 }
594
595 /* TDLS peers can sometimes affect the chandef width */
596 list_for_each_entry_rcu(sta, &local->sta_list, list) {
597 if (!sta->uploaded ||
598 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
599 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
600 !sta->tdls_chandef.chan)
601 continue;
602
603 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
604 compat);
605 if (WARN_ON_ONCE(!compat))
606 break;
607 }
608 rcu_read_unlock();
609
610 if (!compat)
611 return;
612
613 ieee80211_change_chanctx(local, ctx, compat);
614 }
615
616 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
617 struct ieee80211_chanctx *chanctx)
618 {
619 bool radar_enabled;
620
621 lockdep_assert_held(&local->chanctx_mtx);
622 /* for ieee80211_is_radar_required */
623 lockdep_assert_held(&local->mtx);
624
625 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
626
627 if (radar_enabled == chanctx->conf.radar_enabled)
628 return;
629
630 chanctx->conf.radar_enabled = radar_enabled;
631
632 if (!local->use_chanctx) {
633 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
634 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
635 }
636
637 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
638 }
639
640 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
641 struct ieee80211_chanctx *new_ctx)
642 {
643 struct ieee80211_local *local = sdata->local;
644 struct ieee80211_chanctx_conf *conf;
645 struct ieee80211_chanctx *curr_ctx = NULL;
646 int ret = 0;
647
648 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
649 return -ENOTSUPP;
650
651 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
652 lockdep_is_held(&local->chanctx_mtx));
653
654 if (conf) {
655 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
656
657 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
658 conf = NULL;
659 list_del(&sdata->assigned_chanctx_list);
660 }
661
662 if (new_ctx) {
663 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
664 if (ret)
665 goto out;
666
667 conf = &new_ctx->conf;
668 list_add(&sdata->assigned_chanctx_list,
669 &new_ctx->assigned_vifs);
670 }
671
672 out:
673 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
674
675 sdata->vif.bss_conf.idle = !conf;
676
677 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
678 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
679 ieee80211_recalc_smps_chanctx(local, curr_ctx);
680 ieee80211_recalc_radar_chanctx(local, curr_ctx);
681 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
682 }
683
684 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
685 ieee80211_recalc_txpower(sdata, false);
686 ieee80211_recalc_chanctx_min_def(local, new_ctx);
687 }
688
689 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
690 sdata->vif.type != NL80211_IFTYPE_MONITOR)
691 ieee80211_bss_info_change_notify(sdata,
692 BSS_CHANGED_IDLE);
693
694 ieee80211_check_fast_xmit_iface(sdata);
695
696 return ret;
697 }
698
699 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
700 struct ieee80211_chanctx *chanctx)
701 {
702 struct ieee80211_sub_if_data *sdata;
703 u8 rx_chains_static, rx_chains_dynamic;
704
705 lockdep_assert_held(&local->chanctx_mtx);
706
707 rx_chains_static = 1;
708 rx_chains_dynamic = 1;
709
710 rcu_read_lock();
711 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
712 u8 needed_static, needed_dynamic;
713
714 if (!ieee80211_sdata_running(sdata))
715 continue;
716
717 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
718 &chanctx->conf)
719 continue;
720
721 switch (sdata->vif.type) {
722 case NL80211_IFTYPE_P2P_DEVICE:
723 case NL80211_IFTYPE_NAN:
724 continue;
725 case NL80211_IFTYPE_STATION:
726 if (!sdata->u.mgd.associated)
727 continue;
728 break;
729 case NL80211_IFTYPE_AP_VLAN:
730 continue;
731 case NL80211_IFTYPE_AP:
732 case NL80211_IFTYPE_ADHOC:
733 case NL80211_IFTYPE_WDS:
734 case NL80211_IFTYPE_MESH_POINT:
735 case NL80211_IFTYPE_OCB:
736 break;
737 default:
738 WARN_ON_ONCE(1);
739 }
740
741 switch (sdata->smps_mode) {
742 default:
743 WARN_ONCE(1, "Invalid SMPS mode %d\n",
744 sdata->smps_mode);
745 /* fall through */
746 case IEEE80211_SMPS_OFF:
747 needed_static = sdata->needed_rx_chains;
748 needed_dynamic = sdata->needed_rx_chains;
749 break;
750 case IEEE80211_SMPS_DYNAMIC:
751 needed_static = 1;
752 needed_dynamic = sdata->needed_rx_chains;
753 break;
754 case IEEE80211_SMPS_STATIC:
755 needed_static = 1;
756 needed_dynamic = 1;
757 break;
758 }
759
760 rx_chains_static = max(rx_chains_static, needed_static);
761 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
762 }
763
764 /* Disable SMPS for the monitor interface */
765 sdata = rcu_dereference(local->monitor_sdata);
766 if (sdata &&
767 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
768 rx_chains_dynamic = rx_chains_static = local->rx_chains;
769
770 rcu_read_unlock();
771
772 if (!local->use_chanctx) {
773 if (rx_chains_static > 1)
774 local->smps_mode = IEEE80211_SMPS_OFF;
775 else if (rx_chains_dynamic > 1)
776 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
777 else
778 local->smps_mode = IEEE80211_SMPS_STATIC;
779 ieee80211_hw_config(local, 0);
780 }
781
782 if (rx_chains_static == chanctx->conf.rx_chains_static &&
783 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
784 return;
785
786 chanctx->conf.rx_chains_static = rx_chains_static;
787 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
788 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
789 }
790
791 static void
792 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
793 bool clear)
794 {
795 struct ieee80211_local *local __maybe_unused = sdata->local;
796 struct ieee80211_sub_if_data *vlan;
797 struct ieee80211_chanctx_conf *conf;
798
799 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
800 return;
801
802 lockdep_assert_held(&local->mtx);
803
804 /* Check that conf exists, even when clearing this function
805 * must be called with the AP's channel context still there
806 * as it would otherwise cause VLANs to have an invalid
807 * channel context pointer for a while, possibly pointing
808 * to a channel context that has already been freed.
809 */
810 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
811 lockdep_is_held(&local->chanctx_mtx));
812 WARN_ON(!conf);
813
814 if (clear)
815 conf = NULL;
816
817 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
818 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
819 }
820
821 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
822 bool clear)
823 {
824 struct ieee80211_local *local = sdata->local;
825
826 mutex_lock(&local->chanctx_mtx);
827
828 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
829
830 mutex_unlock(&local->chanctx_mtx);
831 }
832
833 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
834 {
835 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
836
837 lockdep_assert_held(&sdata->local->chanctx_mtx);
838
839 if (WARN_ON(!ctx))
840 return -EINVAL;
841
842 list_del(&sdata->reserved_chanctx_list);
843 sdata->reserved_chanctx = NULL;
844
845 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
846 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
847 if (WARN_ON(!ctx->replace_ctx))
848 return -EINVAL;
849
850 WARN_ON(ctx->replace_ctx->replace_state !=
851 IEEE80211_CHANCTX_WILL_BE_REPLACED);
852 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
853
854 ctx->replace_ctx->replace_ctx = NULL;
855 ctx->replace_ctx->replace_state =
856 IEEE80211_CHANCTX_REPLACE_NONE;
857
858 list_del_rcu(&ctx->list);
859 kfree_rcu(ctx, rcu_head);
860 } else {
861 ieee80211_free_chanctx(sdata->local, ctx);
862 }
863 }
864
865 return 0;
866 }
867
868 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
869 const struct cfg80211_chan_def *chandef,
870 enum ieee80211_chanctx_mode mode,
871 bool radar_required)
872 {
873 struct ieee80211_local *local = sdata->local;
874 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
875
876 lockdep_assert_held(&local->chanctx_mtx);
877
878 curr_ctx = ieee80211_vif_get_chanctx(sdata);
879 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
880 return -ENOTSUPP;
881
882 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
883 if (!new_ctx) {
884 if (ieee80211_can_create_new_chanctx(local)) {
885 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
886 if (IS_ERR(new_ctx))
887 return PTR_ERR(new_ctx);
888 } else {
889 if (!curr_ctx ||
890 (curr_ctx->replace_state ==
891 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
892 !list_empty(&curr_ctx->reserved_vifs)) {
893 /*
894 * Another vif already requested this context
895 * for a reservation. Find another one hoping
896 * all vifs assigned to it will also switch
897 * soon enough.
898 *
899 * TODO: This needs a little more work as some
900 * cases (more than 2 chanctx capable devices)
901 * may fail which could otherwise succeed
902 * provided some channel context juggling was
903 * performed.
904 *
905 * Consider ctx1..3, vif1..6, each ctx has 2
906 * vifs. vif1 and vif2 from ctx1 request new
907 * different chandefs starting 2 in-place
908 * reserations with ctx4 and ctx5 replacing
909 * ctx1 and ctx2 respectively. Next vif5 and
910 * vif6 from ctx3 reserve ctx4. If vif3 and
911 * vif4 remain on ctx2 as they are then this
912 * fails unless `replace_ctx` from ctx5 is
913 * replaced with ctx3.
914 */
915 list_for_each_entry(ctx, &local->chanctx_list,
916 list) {
917 if (ctx->replace_state !=
918 IEEE80211_CHANCTX_REPLACE_NONE)
919 continue;
920
921 if (!list_empty(&ctx->reserved_vifs))
922 continue;
923
924 curr_ctx = ctx;
925 break;
926 }
927 }
928
929 /*
930 * If that's true then all available contexts already
931 * have reservations and cannot be used.
932 */
933 if (!curr_ctx ||
934 (curr_ctx->replace_state ==
935 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
936 !list_empty(&curr_ctx->reserved_vifs))
937 return -EBUSY;
938
939 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
940 if (!new_ctx)
941 return -ENOMEM;
942
943 new_ctx->replace_ctx = curr_ctx;
944 new_ctx->replace_state =
945 IEEE80211_CHANCTX_REPLACES_OTHER;
946
947 curr_ctx->replace_ctx = new_ctx;
948 curr_ctx->replace_state =
949 IEEE80211_CHANCTX_WILL_BE_REPLACED;
950
951 list_add_rcu(&new_ctx->list, &local->chanctx_list);
952 }
953 }
954
955 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
956 sdata->reserved_chanctx = new_ctx;
957 sdata->reserved_chandef = *chandef;
958 sdata->reserved_radar_required = radar_required;
959 sdata->reserved_ready = false;
960
961 return 0;
962 }
963
964 static void
965 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
966 {
967 switch (sdata->vif.type) {
968 case NL80211_IFTYPE_ADHOC:
969 case NL80211_IFTYPE_AP:
970 case NL80211_IFTYPE_MESH_POINT:
971 case NL80211_IFTYPE_OCB:
972 ieee80211_queue_work(&sdata->local->hw,
973 &sdata->csa_finalize_work);
974 break;
975 case NL80211_IFTYPE_STATION:
976 ieee80211_queue_work(&sdata->local->hw,
977 &sdata->u.mgd.chswitch_work);
978 break;
979 case NL80211_IFTYPE_UNSPECIFIED:
980 case NL80211_IFTYPE_AP_VLAN:
981 case NL80211_IFTYPE_WDS:
982 case NL80211_IFTYPE_MONITOR:
983 case NL80211_IFTYPE_P2P_CLIENT:
984 case NL80211_IFTYPE_P2P_GO:
985 case NL80211_IFTYPE_P2P_DEVICE:
986 case NL80211_IFTYPE_NAN:
987 case NUM_NL80211_IFTYPES:
988 WARN_ON(1);
989 break;
990 }
991 }
992
993 static void
994 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
995 const struct cfg80211_chan_def *chandef)
996 {
997 struct ieee80211_sub_if_data *vlan;
998
999 sdata->vif.bss_conf.chandef = *chandef;
1000
1001 if (sdata->vif.type != NL80211_IFTYPE_AP)
1002 return;
1003
1004 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1005 vlan->vif.bss_conf.chandef = *chandef;
1006 }
1007
1008 static int
1009 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1010 {
1011 struct ieee80211_local *local = sdata->local;
1012 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1013 struct ieee80211_chanctx *old_ctx, *new_ctx;
1014 const struct cfg80211_chan_def *chandef;
1015 u32 changed = 0;
1016 int err;
1017
1018 lockdep_assert_held(&local->mtx);
1019 lockdep_assert_held(&local->chanctx_mtx);
1020
1021 new_ctx = sdata->reserved_chanctx;
1022 old_ctx = ieee80211_vif_get_chanctx(sdata);
1023
1024 if (WARN_ON(!sdata->reserved_ready))
1025 return -EBUSY;
1026
1027 if (WARN_ON(!new_ctx))
1028 return -EINVAL;
1029
1030 if (WARN_ON(!old_ctx))
1031 return -EINVAL;
1032
1033 if (WARN_ON(new_ctx->replace_state ==
1034 IEEE80211_CHANCTX_REPLACES_OTHER))
1035 return -EINVAL;
1036
1037 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1038 &sdata->reserved_chandef);
1039 if (WARN_ON(!chandef))
1040 return -EINVAL;
1041
1042 ieee80211_change_chanctx(local, new_ctx, chandef);
1043
1044 vif_chsw[0].vif = &sdata->vif;
1045 vif_chsw[0].old_ctx = &old_ctx->conf;
1046 vif_chsw[0].new_ctx = &new_ctx->conf;
1047
1048 list_del(&sdata->reserved_chanctx_list);
1049 sdata->reserved_chanctx = NULL;
1050
1051 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1052 CHANCTX_SWMODE_REASSIGN_VIF);
1053 if (err) {
1054 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1055 ieee80211_free_chanctx(local, new_ctx);
1056
1057 goto out;
1058 }
1059
1060 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1061 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1062
1063 if (sdata->vif.type == NL80211_IFTYPE_AP)
1064 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1065
1066 ieee80211_check_fast_xmit_iface(sdata);
1067
1068 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1069 ieee80211_free_chanctx(local, old_ctx);
1070
1071 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1072 changed = BSS_CHANGED_BANDWIDTH;
1073
1074 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1075
1076 ieee80211_recalc_smps_chanctx(local, new_ctx);
1077 ieee80211_recalc_radar_chanctx(local, new_ctx);
1078 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1079
1080 if (changed)
1081 ieee80211_bss_info_change_notify(sdata, changed);
1082
1083 out:
1084 ieee80211_vif_chanctx_reservation_complete(sdata);
1085 return err;
1086 }
1087
1088 static int
1089 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1090 {
1091 struct ieee80211_local *local = sdata->local;
1092 struct ieee80211_chanctx *old_ctx, *new_ctx;
1093 const struct cfg80211_chan_def *chandef;
1094 int err;
1095
1096 old_ctx = ieee80211_vif_get_chanctx(sdata);
1097 new_ctx = sdata->reserved_chanctx;
1098
1099 if (WARN_ON(!sdata->reserved_ready))
1100 return -EINVAL;
1101
1102 if (WARN_ON(old_ctx))
1103 return -EINVAL;
1104
1105 if (WARN_ON(!new_ctx))
1106 return -EINVAL;
1107
1108 if (WARN_ON(new_ctx->replace_state ==
1109 IEEE80211_CHANCTX_REPLACES_OTHER))
1110 return -EINVAL;
1111
1112 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1113 &sdata->reserved_chandef);
1114 if (WARN_ON(!chandef))
1115 return -EINVAL;
1116
1117 ieee80211_change_chanctx(local, new_ctx, chandef);
1118
1119 list_del(&sdata->reserved_chanctx_list);
1120 sdata->reserved_chanctx = NULL;
1121
1122 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1123 if (err) {
1124 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1125 ieee80211_free_chanctx(local, new_ctx);
1126
1127 goto out;
1128 }
1129
1130 out:
1131 ieee80211_vif_chanctx_reservation_complete(sdata);
1132 return err;
1133 }
1134
1135 static bool
1136 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1137 {
1138 struct ieee80211_chanctx *old_ctx, *new_ctx;
1139
1140 lockdep_assert_held(&sdata->local->chanctx_mtx);
1141
1142 new_ctx = sdata->reserved_chanctx;
1143 old_ctx = ieee80211_vif_get_chanctx(sdata);
1144
1145 if (!old_ctx)
1146 return false;
1147
1148 if (WARN_ON(!new_ctx))
1149 return false;
1150
1151 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1152 return false;
1153
1154 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1155 return false;
1156
1157 return true;
1158 }
1159
1160 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1161 struct ieee80211_chanctx *new_ctx)
1162 {
1163 const struct cfg80211_chan_def *chandef;
1164
1165 lockdep_assert_held(&local->mtx);
1166 lockdep_assert_held(&local->chanctx_mtx);
1167
1168 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1169 if (WARN_ON(!chandef))
1170 return -EINVAL;
1171
1172 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1173 local->_oper_chandef = *chandef;
1174 ieee80211_hw_config(local, 0);
1175
1176 return 0;
1177 }
1178
1179 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1180 int n_vifs)
1181 {
1182 struct ieee80211_vif_chanctx_switch *vif_chsw;
1183 struct ieee80211_sub_if_data *sdata;
1184 struct ieee80211_chanctx *ctx, *old_ctx;
1185 int i, err;
1186
1187 lockdep_assert_held(&local->mtx);
1188 lockdep_assert_held(&local->chanctx_mtx);
1189
1190 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1191 if (!vif_chsw)
1192 return -ENOMEM;
1193
1194 i = 0;
1195 list_for_each_entry(ctx, &local->chanctx_list, list) {
1196 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1197 continue;
1198
1199 if (WARN_ON(!ctx->replace_ctx)) {
1200 err = -EINVAL;
1201 goto out;
1202 }
1203
1204 list_for_each_entry(sdata, &ctx->reserved_vifs,
1205 reserved_chanctx_list) {
1206 if (!ieee80211_vif_has_in_place_reservation(
1207 sdata))
1208 continue;
1209
1210 old_ctx = ieee80211_vif_get_chanctx(sdata);
1211 vif_chsw[i].vif = &sdata->vif;
1212 vif_chsw[i].old_ctx = &old_ctx->conf;
1213 vif_chsw[i].new_ctx = &ctx->conf;
1214
1215 i++;
1216 }
1217 }
1218
1219 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1220 CHANCTX_SWMODE_SWAP_CONTEXTS);
1221
1222 out:
1223 kfree(vif_chsw);
1224 return err;
1225 }
1226
1227 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1228 {
1229 struct ieee80211_chanctx *ctx;
1230 int err;
1231
1232 lockdep_assert_held(&local->mtx);
1233 lockdep_assert_held(&local->chanctx_mtx);
1234
1235 list_for_each_entry(ctx, &local->chanctx_list, list) {
1236 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1237 continue;
1238
1239 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1240 continue;
1241
1242 ieee80211_del_chanctx(local, ctx->replace_ctx);
1243 err = ieee80211_add_chanctx(local, ctx);
1244 if (err)
1245 goto err;
1246 }
1247
1248 return 0;
1249
1250 err:
1251 WARN_ON(ieee80211_add_chanctx(local, ctx));
1252 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1253 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1254 continue;
1255
1256 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1257 continue;
1258
1259 ieee80211_del_chanctx(local, ctx);
1260 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1261 }
1262
1263 return err;
1264 }
1265
1266 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1267 {
1268 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1269 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1270 struct ieee80211_chanctx *new_ctx = NULL;
1271 int err, n_assigned, n_reserved, n_ready;
1272 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1273
1274 lockdep_assert_held(&local->mtx);
1275 lockdep_assert_held(&local->chanctx_mtx);
1276
1277 /*
1278 * If there are 2 independent pairs of channel contexts performing
1279 * cross-switch of their vifs this code will still wait until both are
1280 * ready even though it could be possible to switch one before the
1281 * other is ready.
1282 *
1283 * For practical reasons and code simplicity just do a single huge
1284 * switch.
1285 */
1286
1287 /*
1288 * Verify if the reservation is still feasible.
1289 * - if it's not then disconnect
1290 * - if it is but not all vifs necessary are ready then defer
1291 */
1292
1293 list_for_each_entry(ctx, &local->chanctx_list, list) {
1294 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1295 continue;
1296
1297 if (WARN_ON(!ctx->replace_ctx)) {
1298 err = -EINVAL;
1299 goto err;
1300 }
1301
1302 if (!local->use_chanctx)
1303 new_ctx = ctx;
1304
1305 n_ctx++;
1306
1307 n_assigned = 0;
1308 n_reserved = 0;
1309 n_ready = 0;
1310
1311 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1312 assigned_chanctx_list) {
1313 n_assigned++;
1314 if (sdata->reserved_chanctx) {
1315 n_reserved++;
1316 if (sdata->reserved_ready)
1317 n_ready++;
1318 }
1319 }
1320
1321 if (n_assigned != n_reserved) {
1322 if (n_ready == n_reserved) {
1323 wiphy_info(local->hw.wiphy,
1324 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1325 err = -EBUSY;
1326 goto err;
1327 }
1328
1329 return -EAGAIN;
1330 }
1331
1332 ctx->conf.radar_enabled = false;
1333 list_for_each_entry(sdata, &ctx->reserved_vifs,
1334 reserved_chanctx_list) {
1335 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1336 !sdata->reserved_ready)
1337 return -EAGAIN;
1338
1339 old_ctx = ieee80211_vif_get_chanctx(sdata);
1340 if (old_ctx) {
1341 if (old_ctx->replace_state ==
1342 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1343 n_vifs_switch++;
1344 else
1345 n_vifs_assign++;
1346 } else {
1347 n_vifs_ctxless++;
1348 }
1349
1350 if (sdata->reserved_radar_required)
1351 ctx->conf.radar_enabled = true;
1352 }
1353 }
1354
1355 if (WARN_ON(n_ctx == 0) ||
1356 WARN_ON(n_vifs_switch == 0 &&
1357 n_vifs_assign == 0 &&
1358 n_vifs_ctxless == 0) ||
1359 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1360 WARN_ON(!new_ctx && !local->use_chanctx)) {
1361 err = -EINVAL;
1362 goto err;
1363 }
1364
1365 /*
1366 * All necessary vifs are ready. Perform the switch now depending on
1367 * reservations and driver capabilities.
1368 */
1369
1370 if (local->use_chanctx) {
1371 if (n_vifs_switch > 0) {
1372 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1373 if (err)
1374 goto err;
1375 }
1376
1377 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1378 err = ieee80211_chsw_switch_ctxs(local);
1379 if (err)
1380 goto err;
1381 }
1382 } else {
1383 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1384 if (err)
1385 goto err;
1386 }
1387
1388 /*
1389 * Update all structures, values and pointers to point to new channel
1390 * context(s).
1391 */
1392 list_for_each_entry(ctx, &local->chanctx_list, list) {
1393 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1394 continue;
1395
1396 if (WARN_ON(!ctx->replace_ctx)) {
1397 err = -EINVAL;
1398 goto err;
1399 }
1400
1401 list_for_each_entry(sdata, &ctx->reserved_vifs,
1402 reserved_chanctx_list) {
1403 u32 changed = 0;
1404
1405 if (!ieee80211_vif_has_in_place_reservation(sdata))
1406 continue;
1407
1408 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1409
1410 if (sdata->vif.type == NL80211_IFTYPE_AP)
1411 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1412 false);
1413
1414 ieee80211_check_fast_xmit_iface(sdata);
1415
1416 sdata->radar_required = sdata->reserved_radar_required;
1417
1418 if (sdata->vif.bss_conf.chandef.width !=
1419 sdata->reserved_chandef.width)
1420 changed = BSS_CHANGED_BANDWIDTH;
1421
1422 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1423 if (changed)
1424 ieee80211_bss_info_change_notify(sdata,
1425 changed);
1426
1427 ieee80211_recalc_txpower(sdata, false);
1428 }
1429
1430 ieee80211_recalc_chanctx_chantype(local, ctx);
1431 ieee80211_recalc_smps_chanctx(local, ctx);
1432 ieee80211_recalc_radar_chanctx(local, ctx);
1433 ieee80211_recalc_chanctx_min_def(local, ctx);
1434
1435 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1436 reserved_chanctx_list) {
1437 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1438 continue;
1439
1440 list_del(&sdata->reserved_chanctx_list);
1441 list_move(&sdata->assigned_chanctx_list,
1442 &ctx->assigned_vifs);
1443 sdata->reserved_chanctx = NULL;
1444
1445 ieee80211_vif_chanctx_reservation_complete(sdata);
1446 }
1447
1448 /*
1449 * This context might have been a dependency for an already
1450 * ready re-assign reservation interface that was deferred. Do
1451 * not propagate error to the caller though. The in-place
1452 * reservation for originally requested interface has already
1453 * succeeded at this point.
1454 */
1455 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1456 reserved_chanctx_list) {
1457 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1458 sdata)))
1459 continue;
1460
1461 if (WARN_ON(sdata->reserved_chanctx != ctx))
1462 continue;
1463
1464 if (!sdata->reserved_ready)
1465 continue;
1466
1467 if (ieee80211_vif_get_chanctx(sdata))
1468 err = ieee80211_vif_use_reserved_reassign(
1469 sdata);
1470 else
1471 err = ieee80211_vif_use_reserved_assign(sdata);
1472
1473 if (err) {
1474 sdata_info(sdata,
1475 "failed to finalize (re-)assign reservation (err=%d)\n",
1476 err);
1477 ieee80211_vif_unreserve_chanctx(sdata);
1478 cfg80211_stop_iface(local->hw.wiphy,
1479 &sdata->wdev,
1480 GFP_KERNEL);
1481 }
1482 }
1483 }
1484
1485 /*
1486 * Finally free old contexts
1487 */
1488
1489 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1490 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1491 continue;
1492
1493 ctx->replace_ctx->replace_ctx = NULL;
1494 ctx->replace_ctx->replace_state =
1495 IEEE80211_CHANCTX_REPLACE_NONE;
1496
1497 list_del_rcu(&ctx->list);
1498 kfree_rcu(ctx, rcu_head);
1499 }
1500
1501 return 0;
1502
1503 err:
1504 list_for_each_entry(ctx, &local->chanctx_list, list) {
1505 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1506 continue;
1507
1508 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1509 reserved_chanctx_list) {
1510 ieee80211_vif_unreserve_chanctx(sdata);
1511 ieee80211_vif_chanctx_reservation_complete(sdata);
1512 }
1513 }
1514
1515 return err;
1516 }
1517
1518 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1519 {
1520 struct ieee80211_local *local = sdata->local;
1521 struct ieee80211_chanctx_conf *conf;
1522 struct ieee80211_chanctx *ctx;
1523 bool use_reserved_switch = false;
1524
1525 lockdep_assert_held(&local->chanctx_mtx);
1526
1527 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1528 lockdep_is_held(&local->chanctx_mtx));
1529 if (!conf)
1530 return;
1531
1532 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1533
1534 if (sdata->reserved_chanctx) {
1535 if (sdata->reserved_chanctx->replace_state ==
1536 IEEE80211_CHANCTX_REPLACES_OTHER &&
1537 ieee80211_chanctx_num_reserved(local,
1538 sdata->reserved_chanctx) > 1)
1539 use_reserved_switch = true;
1540
1541 ieee80211_vif_unreserve_chanctx(sdata);
1542 }
1543
1544 ieee80211_assign_vif_chanctx(sdata, NULL);
1545 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1546 ieee80211_free_chanctx(local, ctx);
1547
1548 sdata->radar_required = false;
1549
1550 /* Unreserving may ready an in-place reservation. */
1551 if (use_reserved_switch)
1552 ieee80211_vif_use_reserved_switch(local);
1553 }
1554
1555 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1556 const struct cfg80211_chan_def *chandef,
1557 enum ieee80211_chanctx_mode mode)
1558 {
1559 struct ieee80211_local *local = sdata->local;
1560 struct ieee80211_chanctx *ctx;
1561 u8 radar_detect_width = 0;
1562 int ret;
1563
1564 lockdep_assert_held(&local->mtx);
1565
1566 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1567
1568 mutex_lock(&local->chanctx_mtx);
1569
1570 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1571 chandef,
1572 sdata->wdev.iftype);
1573 if (ret < 0)
1574 goto out;
1575 if (ret > 0)
1576 radar_detect_width = BIT(chandef->width);
1577
1578 sdata->radar_required = ret;
1579
1580 ret = ieee80211_check_combinations(sdata, chandef, mode,
1581 radar_detect_width);
1582 if (ret < 0)
1583 goto out;
1584
1585 __ieee80211_vif_release_channel(sdata);
1586
1587 ctx = ieee80211_find_chanctx(local, chandef, mode);
1588 if (!ctx)
1589 ctx = ieee80211_new_chanctx(local, chandef, mode);
1590 if (IS_ERR(ctx)) {
1591 ret = PTR_ERR(ctx);
1592 goto out;
1593 }
1594
1595 ieee80211_vif_update_chandef(sdata, chandef);
1596
1597 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1598 if (ret) {
1599 /* if assign fails refcount stays the same */
1600 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1601 ieee80211_free_chanctx(local, ctx);
1602 goto out;
1603 }
1604
1605 ieee80211_recalc_smps_chanctx(local, ctx);
1606 ieee80211_recalc_radar_chanctx(local, ctx);
1607 out:
1608 if (ret)
1609 sdata->radar_required = false;
1610
1611 mutex_unlock(&local->chanctx_mtx);
1612 return ret;
1613 }
1614
1615 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1616 {
1617 struct ieee80211_local *local = sdata->local;
1618 struct ieee80211_chanctx *new_ctx;
1619 struct ieee80211_chanctx *old_ctx;
1620 int err;
1621
1622 lockdep_assert_held(&local->mtx);
1623 lockdep_assert_held(&local->chanctx_mtx);
1624
1625 new_ctx = sdata->reserved_chanctx;
1626 old_ctx = ieee80211_vif_get_chanctx(sdata);
1627
1628 if (WARN_ON(!new_ctx))
1629 return -EINVAL;
1630
1631 if (WARN_ON(new_ctx->replace_state ==
1632 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1633 return -EINVAL;
1634
1635 if (WARN_ON(sdata->reserved_ready))
1636 return -EINVAL;
1637
1638 sdata->reserved_ready = true;
1639
1640 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1641 if (old_ctx)
1642 err = ieee80211_vif_use_reserved_reassign(sdata);
1643 else
1644 err = ieee80211_vif_use_reserved_assign(sdata);
1645
1646 if (err)
1647 return err;
1648 }
1649
1650 /*
1651 * In-place reservation may need to be finalized now either if:
1652 * a) sdata is taking part in the swapping itself and is the last one
1653 * b) sdata has switched with a re-assign reservation to an existing
1654 * context readying in-place switching of old_ctx
1655 *
1656 * In case of (b) do not propagate the error up because the requested
1657 * sdata already switched successfully. Just spill an extra warning.
1658 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1659 * interfaces upon failure.
1660 */
1661 if ((old_ctx &&
1662 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1663 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1664 err = ieee80211_vif_use_reserved_switch(local);
1665 if (err && err != -EAGAIN) {
1666 if (new_ctx->replace_state ==
1667 IEEE80211_CHANCTX_REPLACES_OTHER)
1668 return err;
1669
1670 wiphy_info(local->hw.wiphy,
1671 "depending in-place reservation failed (err=%d)\n",
1672 err);
1673 }
1674 }
1675
1676 return 0;
1677 }
1678
1679 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1680 const struct cfg80211_chan_def *chandef,
1681 u32 *changed)
1682 {
1683 struct ieee80211_local *local = sdata->local;
1684 struct ieee80211_chanctx_conf *conf;
1685 struct ieee80211_chanctx *ctx;
1686 const struct cfg80211_chan_def *compat;
1687 int ret;
1688
1689 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1690 IEEE80211_CHAN_DISABLED))
1691 return -EINVAL;
1692
1693 mutex_lock(&local->chanctx_mtx);
1694 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1695 ret = 0;
1696 goto out;
1697 }
1698
1699 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1700 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1701 ret = -EINVAL;
1702 goto out;
1703 }
1704
1705 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1706 lockdep_is_held(&local->chanctx_mtx));
1707 if (!conf) {
1708 ret = -EINVAL;
1709 goto out;
1710 }
1711
1712 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1713
1714 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1715 if (!compat) {
1716 ret = -EINVAL;
1717 goto out;
1718 }
1719
1720 switch (ctx->replace_state) {
1721 case IEEE80211_CHANCTX_REPLACE_NONE:
1722 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1723 ret = -EBUSY;
1724 goto out;
1725 }
1726 break;
1727 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1728 /* TODO: Perhaps the bandwidth change could be treated as a
1729 * reservation itself? */
1730 ret = -EBUSY;
1731 goto out;
1732 case IEEE80211_CHANCTX_REPLACES_OTHER:
1733 /* channel context that is going to replace another channel
1734 * context doesn't really exist and shouldn't be assigned
1735 * anywhere yet */
1736 WARN_ON(1);
1737 break;
1738 }
1739
1740 ieee80211_vif_update_chandef(sdata, chandef);
1741
1742 ieee80211_recalc_chanctx_chantype(local, ctx);
1743
1744 *changed |= BSS_CHANGED_BANDWIDTH;
1745 ret = 0;
1746 out:
1747 mutex_unlock(&local->chanctx_mtx);
1748 return ret;
1749 }
1750
1751 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1752 {
1753 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1754
1755 lockdep_assert_held(&sdata->local->mtx);
1756
1757 mutex_lock(&sdata->local->chanctx_mtx);
1758 __ieee80211_vif_release_channel(sdata);
1759 mutex_unlock(&sdata->local->chanctx_mtx);
1760 }
1761
1762 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1763 {
1764 struct ieee80211_local *local = sdata->local;
1765 struct ieee80211_sub_if_data *ap;
1766 struct ieee80211_chanctx_conf *conf;
1767
1768 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1769 return;
1770
1771 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1772
1773 mutex_lock(&local->chanctx_mtx);
1774
1775 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1776 lockdep_is_held(&local->chanctx_mtx));
1777 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1778 mutex_unlock(&local->chanctx_mtx);
1779 }
1780
1781 void ieee80211_iter_chan_contexts_atomic(
1782 struct ieee80211_hw *hw,
1783 void (*iter)(struct ieee80211_hw *hw,
1784 struct ieee80211_chanctx_conf *chanctx_conf,
1785 void *data),
1786 void *iter_data)
1787 {
1788 struct ieee80211_local *local = hw_to_local(hw);
1789 struct ieee80211_chanctx *ctx;
1790
1791 rcu_read_lock();
1792 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1793 if (ctx->driver_present)
1794 iter(hw, &ctx->conf, iter_data);
1795 rcu_read_unlock();
1796 }
1797 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
Linux with added FPC-III support