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