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mac80211: make check_combinations() aware of chanctx reservation
[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / chan.c
CommitLineData
f444de05
JB		 1/*
2 * mac80211 - channel management
3 */
4
0aaffa9b 5#include <linux/nl80211.h>
3448c005 6#include <linux/export.h>
4d76d21b 7#include <linux/rtnetlink.h>
3117bbdb 8#include <net/cfg80211.h>
f444de05 9#include "ieee80211_i.h"
35f2fce9 10#include "driver-ops.h"
f444de05 11
c0166da9
MK		 12static 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
26static 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
40int 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
c2b90ad8
MK		 47static 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
60static 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
5bcae31d
MK		 66static struct ieee80211_chanctx *
67ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
68{
69 struct ieee80211_local *local = 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
0288157b
MK		 80static const struct cfg80211_chan_def *
81ieee80211_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
13f348a8
MK		 103static const struct cfg80211_chan_def *
104ieee80211_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
129static const struct cfg80211_chan_def *
130ieee80211_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
147static bool
148ieee80211_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
164static struct ieee80211_chanctx *
165ieee80211_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) {
5bcae31d
MK		 177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
178 continue;
179
13f348a8
MK		 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
21f659bf
EP		 193static 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
222static enum nl80211_chan_width
223ieee80211_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 if (!sta->uploaded)
235 continue;
236
237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
238 }
239 rcu_read_unlock();
240
241 return max_bw;
242}
243
244static enum nl80211_chan_width
245ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
246 struct ieee80211_chanctx_conf *conf)
247{
248 struct ieee80211_sub_if_data *sdata;
249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
250
251 rcu_read_lock();
252 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
253 struct ieee80211_vif *vif = &sdata->vif;
254 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
255
256 if (!ieee80211_sdata_running(sdata))
257 continue;
258
259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
260 continue;
261
262 switch (vif->type) {
263 case NL80211_IFTYPE_AP:
264 case NL80211_IFTYPE_AP_VLAN:
265 width = ieee80211_get_max_required_bw(sdata);
266 break;
267 case NL80211_IFTYPE_P2P_DEVICE:
268 continue;
269 case NL80211_IFTYPE_STATION:
270 case NL80211_IFTYPE_ADHOC:
271 case NL80211_IFTYPE_WDS:
272 case NL80211_IFTYPE_MESH_POINT:
273 width = vif->bss_conf.chandef.width;
274 break;
275 case NL80211_IFTYPE_UNSPECIFIED:
276 case NUM_NL80211_IFTYPES:
277 case NL80211_IFTYPE_MONITOR:
278 case NL80211_IFTYPE_P2P_CLIENT:
279 case NL80211_IFTYPE_P2P_GO:
280 WARN_ON_ONCE(1);
281 }
282 max_bw = max(max_bw, width);
283 }
1c37a72c
EP		 284
285 /* use the configured bandwidth in case of monitor interface */
286 sdata = rcu_dereference(local->monitor_sdata);
287 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
288 max_bw = max(max_bw, conf->def.width);
289
21f659bf
EP		 290 rcu_read_unlock();
291
292 return max_bw;
293}
294
295/*
296 * recalc the min required chan width of the channel context, which is
297 * the max of min required widths of all the interfaces bound to this
298 * channel context.
299 */
300void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
301 struct ieee80211_chanctx *ctx)
302{
303 enum nl80211_chan_width max_bw;
304 struct cfg80211_chan_def min_def;
305
306 lockdep_assert_held(&local->chanctx_mtx);
307
308 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
309 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
310 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
311 ctx->conf.radar_enabled) {
312 ctx->conf.min_def = ctx->conf.def;
313 return;
314 }
315
316 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
317
318 /* downgrade chandef up to max_bw */
319 min_def = ctx->conf.def;
320 while (min_def.width > max_bw)
321 ieee80211_chandef_downgrade(&min_def);
322
323 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
324 return;
325
326 ctx->conf.min_def = min_def;
327 if (!ctx->driver_present)
328 return;
329
330 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
331}
332
18942d3b 333static void ieee80211_change_chanctx(struct ieee80211_local *local,
4bf88530
JB		 334 struct ieee80211_chanctx *ctx,
335 const struct cfg80211_chan_def *chandef)
23a85b45 336{
4bf88530 337 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
e89a96f5 338 return;
0aaffa9b 339
4bf88530
JB		 340 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
341
342 ctx->conf.def = *chandef;
343 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
21f659bf 344 ieee80211_recalc_chanctx_min_def(local, ctx);
55de908a
JB		 345
346 if (!local->use_chanctx) {
675a0b04 347 local->_oper_chandef = *chandef;
55de908a
JB		 348 ieee80211_hw_config(local, 0);
349 }
0aaffa9b 350}
d01a1e65
MK		 351
352static struct ieee80211_chanctx *
353ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530 354 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 355 enum ieee80211_chanctx_mode mode)
356{
357 struct ieee80211_chanctx *ctx;
358
359 lockdep_assert_held(&local->chanctx_mtx);
360
361 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
362 return NULL;
d01a1e65
MK		 363
364 list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530 365 const struct cfg80211_chan_def *compat;
e89a96f5 366
5bcae31d
MK		 367 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
368 continue;
369
d01a1e65
MK		 370 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
371 continue;
4bf88530
JB		 372
373 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
374 if (!compat)
d01a1e65
MK		 375 continue;
376
0288157b
MK		 377 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
378 compat);
379 if (!compat)
380 continue;
381
18942d3b 382 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5 383
d01a1e65
MK		 384 return ctx;
385 }
386
387 return NULL;
388}
389
e4746851
SW		 390static bool ieee80211_is_radar_required(struct ieee80211_local *local)
391{
392 struct ieee80211_sub_if_data *sdata;
393
cc901de1
MK		 394 lockdep_assert_held(&local->mtx);
395
e4746851
SW		 396 rcu_read_lock();
397 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
398 if (sdata->radar_required) {
399 rcu_read_unlock();
400 return true;
401 }
402 }
403 rcu_read_unlock();
404
405 return false;
406}
407
d01a1e65 408static struct ieee80211_chanctx *
ed68ebca
MK		 409ieee80211_alloc_chanctx(struct ieee80211_local *local,
410 const struct cfg80211_chan_def *chandef,
411 enum ieee80211_chanctx_mode mode)
d01a1e65
MK		 412{
413 struct ieee80211_chanctx *ctx;
414
415 lockdep_assert_held(&local->chanctx_mtx);
416
417 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
418 if (!ctx)
ed68ebca 419 return NULL;
d01a1e65 420
484298ad 421 INIT_LIST_HEAD(&ctx->assigned_vifs);
e3afb920 422 INIT_LIST_HEAD(&ctx->reserved_vifs);
4bf88530 423 ctx->conf.def = *chandef;
04ecd257
JB		 424 ctx->conf.rx_chains_static = 1;
425 ctx->conf.rx_chains_dynamic = 1;
d01a1e65 426 ctx->mode = mode;
e4746851 427 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
21f659bf 428 ieee80211_recalc_chanctx_min_def(local, ctx);
ed68ebca
MK		 429
430 return ctx;
431}
432
433static int ieee80211_add_chanctx(struct ieee80211_local *local,
434 struct ieee80211_chanctx *ctx)
435{
436 u32 changed;
437 int err;
438
439 lockdep_assert_held(&local->mtx);
440 lockdep_assert_held(&local->chanctx_mtx);
441
e4746851
SW		 442 if (!local->use_chanctx)
443 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
d01a1e65 444
382a103b
JB		 445 /* turn idle off *before* setting channel -- some drivers need that */
446 changed = ieee80211_idle_off(local);
447 if (changed)
448 ieee80211_hw_config(local, changed);
449
55de908a 450 if (!local->use_chanctx) {
ed68ebca 451 local->_oper_chandef = ctx->conf.def;
9b4816f5 452 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
55de908a
JB		 453 } else {
454 err = drv_add_chanctx(local, ctx);
455 if (err) {
382a103b 456 ieee80211_recalc_idle(local);
ed68ebca 457 return err;
55de908a 458 }
35f2fce9
MK		 459 }
460
ed68ebca
MK		 461 return 0;
462}
463
464static struct ieee80211_chanctx *
465ieee80211_new_chanctx(struct ieee80211_local *local,
466 const struct cfg80211_chan_def *chandef,
467 enum ieee80211_chanctx_mode mode)
468{
469 struct ieee80211_chanctx *ctx;
470 int err;
d01a1e65 471
ed68ebca
MK		 472 lockdep_assert_held(&local->mtx);
473 lockdep_assert_held(&local->chanctx_mtx);
d01a1e65 474
ed68ebca
MK		 475 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
476 if (!ctx)
477 return ERR_PTR(-ENOMEM);
478
479 err = ieee80211_add_chanctx(local, ctx);
480 if (err) {
481 kfree(ctx);
482 return ERR_PTR(err);
483 }
484
485 list_add_rcu(&ctx->list, &local->chanctx_list);
d01a1e65
MK		 486 return ctx;
487}
488
1f0d54cd
MK		 489static void ieee80211_del_chanctx(struct ieee80211_local *local,
490 struct ieee80211_chanctx *ctx)
d01a1e65
MK		 491{
492 lockdep_assert_held(&local->chanctx_mtx);
493
55de908a 494 if (!local->use_chanctx) {
675a0b04
KB		 495 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
496 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
497 chandef->center_freq1 = chandef->chan->center_freq;
498 chandef->center_freq2 = 0;
e4746851
SW		 499
500 /* NOTE: Disabling radar is only valid here for
501 * single channel context. To be sure, check it ...
502 */
1f0d54cd
MK		 503 WARN_ON(local->hw.conf.radar_enabled &&
504 !list_empty(&local->chanctx_list));
505
e4746851
SW		 506 local->hw.conf.radar_enabled = false;
507
9b4816f5 508 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
55de908a
JB		 509 } else {
510 drv_remove_chanctx(local, ctx);
511 }
35f2fce9 512
fd0f979a 513 ieee80211_recalc_idle(local);
d01a1e65
MK		 514}
515
1f0d54cd
MK		 516static void ieee80211_free_chanctx(struct ieee80211_local *local,
517 struct ieee80211_chanctx *ctx)
d01a1e65 518{
d01a1e65
MK		 519 lockdep_assert_held(&local->chanctx_mtx);
520
c0166da9 521 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
5bbe754d 522
1f0d54cd
MK		 523 list_del_rcu(&ctx->list);
524 ieee80211_del_chanctx(local, ctx);
525 kfree_rcu(ctx, rcu_head);
d01a1e65
MK		 526}
527
4bf88530
JB		 528static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
529 struct ieee80211_chanctx *ctx)
e89a96f5
MK		 530{
531 struct ieee80211_chanctx_conf *conf = &ctx->conf;
532 struct ieee80211_sub_if_data *sdata;
4bf88530 533 const struct cfg80211_chan_def *compat = NULL;
e89a96f5
MK		 534
535 lockdep_assert_held(&local->chanctx_mtx);
536
537 rcu_read_lock();
538 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530 539
e89a96f5
MK		 540 if (!ieee80211_sdata_running(sdata))
541 continue;
542 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
543 continue;
544
4bf88530
JB		 545 if (!compat)
546 compat = &sdata->vif.bss_conf.chandef;
547
548 compat = cfg80211_chandef_compatible(
549 &sdata->vif.bss_conf.chandef, compat);
550 if (!compat)
551 break;
e89a96f5
MK		 552 }
553 rcu_read_unlock();
554
4bf88530
JB		 555 if (WARN_ON_ONCE(!compat))
556 return;
e89a96f5 557
18942d3b 558 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5
MK		 559}
560
367bbd10
JB		 561static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
562 struct ieee80211_chanctx *chanctx)
563{
564 bool radar_enabled;
565
566 lockdep_assert_held(&local->chanctx_mtx);
34a3740d
JB		 567 /* for setting local->radar_detect_enabled */
568 lockdep_assert_held(&local->mtx);
367bbd10
JB		 569
570 radar_enabled = ieee80211_is_radar_required(local);
571
572 if (radar_enabled == chanctx->conf.radar_enabled)
573 return;
574
575 chanctx->conf.radar_enabled = radar_enabled;
576 local->radar_detect_enabled = chanctx->conf.radar_enabled;
577
578 if (!local->use_chanctx) {
579 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
580 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
581 }
582
583 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
584}
585
77eeba97
LC		 586static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
587 struct ieee80211_chanctx *new_ctx)
d01a1e65 588{
35f2fce9 589 struct ieee80211_local *local = sdata->local;
77eeba97
LC		 590 struct ieee80211_chanctx_conf *conf;
591 struct ieee80211_chanctx *curr_ctx = NULL;
592 int ret = 0;
d01a1e65 593
77eeba97
LC		 594 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
595 lockdep_is_held(&local->chanctx_mtx));
d01a1e65 596
77eeba97
LC		 597 if (conf) {
598 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
35f2fce9 599
77eeba97
LC		 600 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
601 conf = NULL;
484298ad 602 list_del(&sdata->assigned_chanctx_list);
77eeba97 603 }
5bbe754d 604
77eeba97
LC		 605 if (new_ctx) {
606 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
607 if (ret)
608 goto out;
fd0f979a 609
77eeba97 610 conf = &new_ctx->conf;
484298ad
MK		 611 list_add(&sdata->assigned_chanctx_list,
612 &new_ctx->assigned_vifs);
77eeba97 613 }
e89a96f5 614
77eeba97
LC		 615out:
616 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
fd0f979a 617
77eeba97
LC		 618 sdata->vif.bss_conf.idle = !conf;
619
c0166da9 620 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
77eeba97
LC		 621 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
622 ieee80211_recalc_smps_chanctx(local, curr_ctx);
623 ieee80211_recalc_radar_chanctx(local, curr_ctx);
624 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
04ecd257 625 }
e89a96f5 626
c0166da9 627 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
77eeba97
LC		 628 ieee80211_recalc_txpower(sdata);
629 ieee80211_recalc_chanctx_min_def(local, new_ctx);
04ecd257 630 }
77eeba97
LC		 631
632 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
633 sdata->vif.type != NL80211_IFTYPE_MONITOR)
634 ieee80211_bss_info_change_notify(sdata,
635 BSS_CHANGED_IDLE);
636
637 return ret;
d01a1e65
MK		 638}
639
640static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
641{
642 struct ieee80211_local *local = sdata->local;
643 struct ieee80211_chanctx_conf *conf;
644 struct ieee80211_chanctx *ctx;
5bcae31d 645 bool use_reserved_switch = false;
d01a1e65
MK		 646
647 lockdep_assert_held(&local->chanctx_mtx);
648
649 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
650 lockdep_is_held(&local->chanctx_mtx));
651 if (!conf)
652 return;
653
654 ctx = container_of(conf, struct ieee80211_chanctx, conf);
655
5bcae31d
MK		 656 if (sdata->reserved_chanctx) {
657 if (sdata->reserved_chanctx->replace_state ==
658 IEEE80211_CHANCTX_REPLACES_OTHER &&
659 ieee80211_chanctx_num_reserved(local,
660 sdata->reserved_chanctx) > 1)
661 use_reserved_switch = true;
662
11335a55 663 ieee80211_vif_unreserve_chanctx(sdata);
5bcae31d 664 }
11335a55 665
77eeba97 666 ieee80211_assign_vif_chanctx(sdata, NULL);
c0166da9 667 if (ieee80211_chanctx_refcount(local, ctx) == 0)
d01a1e65 668 ieee80211_free_chanctx(local, ctx);
5bcae31d
MK		 669
670 /* Unreserving may ready an in-place reservation. */
671 if (use_reserved_switch)
672 ieee80211_vif_use_reserved_switch(local);
d01a1e65
MK		 673}
674
04ecd257
JB		 675void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
676 struct ieee80211_chanctx *chanctx)
677{
678 struct ieee80211_sub_if_data *sdata;
679 u8 rx_chains_static, rx_chains_dynamic;
680
681 lockdep_assert_held(&local->chanctx_mtx);
682
683 rx_chains_static = 1;
684 rx_chains_dynamic = 1;
685
686 rcu_read_lock();
687 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
688 u8 needed_static, needed_dynamic;
689
690 if (!ieee80211_sdata_running(sdata))
691 continue;
692
693 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
694 &chanctx->conf)
695 continue;
696
697 switch (sdata->vif.type) {
698 case NL80211_IFTYPE_P2P_DEVICE:
699 continue;
700 case NL80211_IFTYPE_STATION:
701 if (!sdata->u.mgd.associated)
702 continue;
703 break;
704 case NL80211_IFTYPE_AP_VLAN:
705 continue;
706 case NL80211_IFTYPE_AP:
707 case NL80211_IFTYPE_ADHOC:
708 case NL80211_IFTYPE_WDS:
709 case NL80211_IFTYPE_MESH_POINT:
710 break;
711 default:
712 WARN_ON_ONCE(1);
713 }
714
715 switch (sdata->smps_mode) {
716 default:
717 WARN_ONCE(1, "Invalid SMPS mode %d\n",
718 sdata->smps_mode);
719 /* fall through */
720 case IEEE80211_SMPS_OFF:
721 needed_static = sdata->needed_rx_chains;
722 needed_dynamic = sdata->needed_rx_chains;
723 break;
724 case IEEE80211_SMPS_DYNAMIC:
725 needed_static = 1;
726 needed_dynamic = sdata->needed_rx_chains;
727 break;
728 case IEEE80211_SMPS_STATIC:
729 needed_static = 1;
730 needed_dynamic = 1;
731 break;
732 }
733
734 rx_chains_static = max(rx_chains_static, needed_static);
735 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
736 }
7b8a9cdd
IY		 737
738 /* Disable SMPS for the monitor interface */
739 sdata = rcu_dereference(local->monitor_sdata);
740 if (sdata &&
741 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
742 rx_chains_dynamic = rx_chains_static = local->rx_chains;
743
04ecd257
JB		 744 rcu_read_unlock();
745
746 if (!local->use_chanctx) {
747 if (rx_chains_static > 1)
748 local->smps_mode = IEEE80211_SMPS_OFF;
749 else if (rx_chains_dynamic > 1)
750 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
751 else
752 local->smps_mode = IEEE80211_SMPS_STATIC;
753 ieee80211_hw_config(local, 0);
754 }
755
756 if (rx_chains_static == chanctx->conf.rx_chains_static &&
757 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
758 return;
759
760 chanctx->conf.rx_chains_static = rx_chains_static;
761 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
762 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
763}
764
d01a1e65 765int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530 766 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 767 enum ieee80211_chanctx_mode mode)
768{
769 struct ieee80211_local *local = sdata->local;
770 struct ieee80211_chanctx *ctx;
73de86a3 771 u8 radar_detect_width = 0;
d01a1e65
MK		 772 int ret;
773
34a3740d
JB		 774 lockdep_assert_held(&local->mtx);
775
55de908a
JB		 776 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
777
d01a1e65 778 mutex_lock(&local->chanctx_mtx);
73de86a3
LC		 779
780 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
781 chandef,
782 sdata->wdev.iftype);
783 if (ret < 0)
784 goto out;
785 if (ret > 0)
786 radar_detect_width = BIT(chandef->width);
787
788 sdata->radar_required = ret;
789
790 ret = ieee80211_check_combinations(sdata, chandef, mode,
791 radar_detect_width);
792 if (ret < 0)
793 goto out;
794
d01a1e65
MK		 795 __ieee80211_vif_release_channel(sdata);
796
4bf88530 797 ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65 798 if (!ctx)
4bf88530 799 ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65
MK		 800 if (IS_ERR(ctx)) {
801 ret = PTR_ERR(ctx);
802 goto out;
803 }
804
4bf88530 805 sdata->vif.bss_conf.chandef = *chandef;
55de908a 806
d01a1e65
MK		 807 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
808 if (ret) {
809 /* if assign fails refcount stays the same */
c0166da9 810 if (ieee80211_chanctx_refcount(local, ctx) == 0)
d01a1e65
MK		 811 ieee80211_free_chanctx(local, ctx);
812 goto out;
813 }
814
04ecd257 815 ieee80211_recalc_smps_chanctx(local, ctx);
164eb02d 816 ieee80211_recalc_radar_chanctx(local, ctx);
d01a1e65
MK		 817 out:
818 mutex_unlock(&local->chanctx_mtx);
819 return ret;
820}
821
33ffd952
LC		 822static int __ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,
823 struct ieee80211_chanctx *ctx,
824 u32 *changed)
73da7d5b
SW		 825{
826 struct ieee80211_local *local = sdata->local;
33787fc4 827 const struct cfg80211_chan_def *chandef = &sdata->csa_chandef;
73da7d5b
SW		 828 u32 chanctx_changed = 0;
829
73da7d5b
SW		 830 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
831 IEEE80211_CHAN_DISABLED))
832 return -EINVAL;
833
c0166da9 834 if (ieee80211_chanctx_refcount(local, ctx) != 1)
33ffd952 835 return -EINVAL;
73da7d5b
SW		 836
837 if (sdata->vif.bss_conf.chandef.width != chandef->width) {
838 chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH;
839 *changed |= BSS_CHANGED_BANDWIDTH;
840 }
841
842 sdata->vif.bss_conf.chandef = *chandef;
843 ctx->conf.def = *chandef;
844
845 chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL;
846 drv_change_chanctx(local, ctx, chanctx_changed);
847
73da7d5b
SW		 848 ieee80211_recalc_chanctx_chantype(local, ctx);
849 ieee80211_recalc_smps_chanctx(local, ctx);
850 ieee80211_recalc_radar_chanctx(local, ctx);
21f659bf 851 ieee80211_recalc_chanctx_min_def(local, ctx);
73da7d5b 852
33ffd952
LC		 853 return 0;
854}
855
73da7d5b 856int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,
73da7d5b
SW		 857 u32 *changed)
858{
859 struct ieee80211_local *local = sdata->local;
860 struct ieee80211_chanctx_conf *conf;
861 struct ieee80211_chanctx *ctx;
862 int ret;
73da7d5b 863
34a3740d
JB		 864 lockdep_assert_held(&local->mtx);
865
73da7d5b
SW		 866 /* should never be called if not performing a channel switch. */
867 if (WARN_ON(!sdata->vif.csa_active))
868 return -EINVAL;
869
33ffd952
LC		 870 mutex_lock(&local->chanctx_mtx);
871 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
872 lockdep_is_held(&local->chanctx_mtx));
873 if (!conf) {
874 ret = -EINVAL;
875 goto out;
876 }
877
878 ctx = container_of(conf, struct ieee80211_chanctx, conf);
879
880 ret = __ieee80211_vif_change_channel(sdata, ctx, changed);
73da7d5b
SW		 881 out:
882 mutex_unlock(&local->chanctx_mtx);
883 return ret;
884}
885
11335a55
LC		 886static void
887__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
888 bool clear)
889{
33926eb7 890 struct ieee80211_local *local __maybe_unused = sdata->local;
11335a55
LC		 891 struct ieee80211_sub_if_data *vlan;
892 struct ieee80211_chanctx_conf *conf;
893
894 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
895 return;
896
897 lockdep_assert_held(&local->mtx);
898
899 /* Check that conf exists, even when clearing this function
900 * must be called with the AP's channel context still there
901 * as it would otherwise cause VLANs to have an invalid
902 * channel context pointer for a while, possibly pointing
903 * to a channel context that has already been freed.
904 */
905 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
33926eb7 906 lockdep_is_held(&local->chanctx_mtx));
11335a55
LC		 907 WARN_ON(!conf);
908
909 if (clear)
910 conf = NULL;
911
912 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
913 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
914}
915
916void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
917 bool clear)
918{
919 struct ieee80211_local *local = sdata->local;
920
921 mutex_lock(&local->chanctx_mtx);
922
923 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
924
925 mutex_unlock(&local->chanctx_mtx);
926}
927
928int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
929{
e3afb920
MK		 930 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
931
11335a55
LC		 932 lockdep_assert_held(&sdata->local->chanctx_mtx);
933
e3afb920 934 if (WARN_ON(!ctx))
73da7d5b
SW		 935 return -EINVAL;
936
e3afb920 937 list_del(&sdata->reserved_chanctx_list);
11335a55
LC		 938 sdata->reserved_chanctx = NULL;
939
5bcae31d
MK		 940 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
941 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
942 if (WARN_ON(!ctx->replace_ctx))
943 return -EINVAL;
944
945 WARN_ON(ctx->replace_ctx->replace_state !=
946 IEEE80211_CHANCTX_WILL_BE_REPLACED);
947 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
948
949 ctx->replace_ctx->replace_ctx = NULL;
950 ctx->replace_ctx->replace_state =
951 IEEE80211_CHANCTX_REPLACE_NONE;
952
953 list_del_rcu(&ctx->list);
954 kfree_rcu(ctx, rcu_head);
955 } else {
956 ieee80211_free_chanctx(sdata->local, ctx);
957 }
958 }
e3afb920 959
11335a55
LC		 960 return 0;
961}
962
963int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
964 const struct cfg80211_chan_def *chandef,
09332481
MK		 965 enum ieee80211_chanctx_mode mode,
966 bool radar_required)
11335a55
LC		 967{
968 struct ieee80211_local *local = sdata->local;
5bcae31d 969 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
11335a55 970
5bcae31d 971 lockdep_assert_held(&local->chanctx_mtx);
73da7d5b 972
5bcae31d
MK		 973 curr_ctx = ieee80211_vif_get_chanctx(sdata);
974 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
975 return -ENOTSUPP;
11335a55 976
13f348a8 977 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
11335a55 978 if (!new_ctx) {
5bcae31d 979 if (ieee80211_can_create_new_chanctx(local)) {
5d52ee81 980 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
5bcae31d
MK		 981 if (IS_ERR(new_ctx))
982 return PTR_ERR(new_ctx);
c2b90ad8 983 } else {
5bcae31d
MK		 984 if (!curr_ctx ||
985 (curr_ctx->replace_state ==
986 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
987 !list_empty(&curr_ctx->reserved_vifs)) {
988 /*
989 * Another vif already requested this context
990 * for a reservation. Find another one hoping
991 * all vifs assigned to it will also switch
992 * soon enough.
993 *
994 * TODO: This needs a little more work as some
995 * cases (more than 2 chanctx capable devices)
996 * may fail which could otherwise succeed
997 * provided some channel context juggling was
998 * performed.
999 *
1000 * Consider ctx1..3, vif1..6, each ctx has 2
1001 * vifs. vif1 and vif2 from ctx1 request new
1002 * different chandefs starting 2 in-place
1003 * reserations with ctx4 and ctx5 replacing
1004 * ctx1 and ctx2 respectively. Next vif5 and
1005 * vif6 from ctx3 reserve ctx4. If vif3 and
1006 * vif4 remain on ctx2 as they are then this
1007 * fails unless `replace_ctx` from ctx5 is
1008 * replaced with ctx3.
1009 */
1010 list_for_each_entry(ctx, &local->chanctx_list,
1011 list) {
1012 if (ctx->replace_state !=
1013 IEEE80211_CHANCTX_REPLACE_NONE)
1014 continue;
1015
1016 if (!list_empty(&ctx->reserved_vifs))
1017 continue;
1018
1019 curr_ctx = ctx;
1020 break;
1021 }
1022 }
1023
1024 /*
1025 * If that's true then all available contexts already
1026 * have reservations and cannot be used.
1027 */
1028 if (!curr_ctx ||
1029 (curr_ctx->replace_state ==
1030 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1031 !list_empty(&curr_ctx->reserved_vifs))
1032 return -EBUSY;
1033
1034 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1035 if (!new_ctx)
1036 return -ENOMEM;
1037
1038 new_ctx->replace_ctx = curr_ctx;
1039 new_ctx->replace_state =
1040 IEEE80211_CHANCTX_REPLACES_OTHER;
1041
1042 curr_ctx->replace_ctx = new_ctx;
1043 curr_ctx->replace_state =
1044 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1045
1046 list_add_rcu(&new_ctx->list, &local->chanctx_list);
11335a55
LC		 1047 }
1048 }
1049
e3afb920 1050 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
11335a55
LC		 1051 sdata->reserved_chanctx = new_ctx;
1052 sdata->reserved_chandef = *chandef;
09332481 1053 sdata->reserved_radar_required = radar_required;
5bcae31d
MK		 1054 sdata->reserved_ready = false;
1055
1056 return 0;
11335a55
LC		 1057}
1058
5bcae31d
MK		 1059static int
1060ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
11335a55
LC		 1061{
1062 struct ieee80211_local *local = sdata->local;
5bcae31d
MK		 1063 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1064 struct ieee80211_chanctx *old_ctx, *new_ctx;
1065 const struct cfg80211_chan_def *chandef;
1066 u32 changed = 0;
1067 int err;
11335a55
LC		 1068
1069 lockdep_assert_held(&local->mtx);
5bcae31d 1070 lockdep_assert_held(&local->chanctx_mtx);
11335a55 1071
5bcae31d
MK		 1072 new_ctx = sdata->reserved_chanctx;
1073 old_ctx = ieee80211_vif_get_chanctx(sdata);
11335a55 1074
5bcae31d
MK		 1075 if (WARN_ON(!sdata->reserved_ready))
1076 return -EBUSY;
73da7d5b 1077
5bcae31d
MK		 1078 if (WARN_ON(!new_ctx))
1079 return -EINVAL;
1080
1081 if (WARN_ON(!old_ctx))
1082 return -EINVAL;
1083
1084 if (WARN_ON(new_ctx->replace_state ==
1085 IEEE80211_CHANCTX_REPLACES_OTHER))
1086 return -EINVAL;
1087
1088 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1089 &sdata->reserved_chandef);
1090 if (WARN_ON(!chandef))
1091 return -EINVAL;
1092
1093 vif_chsw[0].vif = &sdata->vif;
1094 vif_chsw[0].old_ctx = &old_ctx->conf;
1095 vif_chsw[0].new_ctx = &new_ctx->conf;
1096
1097 list_del(&sdata->reserved_chanctx_list);
1098 sdata->reserved_chanctx = NULL;
1099
1100 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1101 CHANCTX_SWMODE_REASSIGN_VIF);
1102 if (err) {
1103 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1104 ieee80211_free_chanctx(local, new_ctx);
1105
1106 return err;
73da7d5b
SW		 1107 }
1108
5bcae31d
MK		 1109 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1110 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1111
1112 if (sdata->vif.type == NL80211_IFTYPE_AP)
1113 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1114
1115 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1116 ieee80211_free_chanctx(local, old_ctx);
73da7d5b 1117
11335a55 1118 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
5bcae31d 1119 changed = BSS_CHANGED_BANDWIDTH;
11335a55
LC		 1120
1121 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1122
5bcae31d
MK		 1123 if (changed)
1124 ieee80211_bss_info_change_notify(sdata, changed);
1125
1126 return err;
1127}
1128
1129static int
1130ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1131{
1132 struct ieee80211_local *local = sdata->local;
1133 struct ieee80211_chanctx *old_ctx, *new_ctx;
1134 const struct cfg80211_chan_def *chandef;
1135 int err;
1136
1137 old_ctx = ieee80211_vif_get_chanctx(sdata);
1138 new_ctx = sdata->reserved_chanctx;
1139
1140 if (WARN_ON(!sdata->reserved_ready))
1141 return -EINVAL;
1142
1143 if (WARN_ON(old_ctx))
1144 return -EINVAL;
1145
1146 if (WARN_ON(!new_ctx))
1147 return -EINVAL;
1148
1149 if (WARN_ON(new_ctx->replace_state ==
1150 IEEE80211_CHANCTX_REPLACES_OTHER))
1151 return -EINVAL;
1152
1153 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1154 &sdata->reserved_chandef);
1155 if (WARN_ON(!chandef))
1156 return -EINVAL;
1157
e3afb920 1158 list_del(&sdata->reserved_chanctx_list);
5bcae31d 1159 sdata->reserved_chanctx = NULL;
11335a55 1160
5bcae31d
MK		 1161 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1162 if (err) {
1163 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1164 ieee80211_free_chanctx(local, new_ctx);
1165
1166 goto out;
1167 }
1168
1169out:
1170 return err;
1171}
1172
1173static bool
1174ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1175{
1176 struct ieee80211_chanctx *old_ctx, *new_ctx;
1177
1178 lockdep_assert_held(&sdata->local->chanctx_mtx);
1179
1180 new_ctx = sdata->reserved_chanctx;
1181 old_ctx = ieee80211_vif_get_chanctx(sdata);
1182
1183 if (!old_ctx)
1184 return false;
1185
1186 if (WARN_ON(!new_ctx))
1187 return false;
1188
1189 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1190 return false;
1191
1192 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1193 return false;
1194
1195 return true;
1196}
1197
1198static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1199 struct ieee80211_chanctx *new_ctx)
1200{
1201 const struct cfg80211_chan_def *chandef;
1202
1203 lockdep_assert_held(&local->mtx);
1204 lockdep_assert_held(&local->chanctx_mtx);
1205
1206 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1207 if (WARN_ON(!chandef))
1208 return -EINVAL;
1209
1210 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1211 local->_oper_chandef = *chandef;
1212 ieee80211_hw_config(local, 0);
1213
1214 return 0;
1215}
1216
1217static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1218 int n_vifs)
1219{
1220 struct ieee80211_vif_chanctx_switch *vif_chsw;
1221 struct ieee80211_sub_if_data *sdata;
1222 struct ieee80211_chanctx *ctx, *old_ctx;
1223 int i, err;
1224
1225 lockdep_assert_held(&local->mtx);
1226 lockdep_assert_held(&local->chanctx_mtx);
1227
1228 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1229 if (!vif_chsw)
1230 return -ENOMEM;
1231
1232 i = 0;
1233 list_for_each_entry(ctx, &local->chanctx_list, list) {
1234 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1235 continue;
1236
1237 if (WARN_ON(!ctx->replace_ctx)) {
1238 err = -EINVAL;
5d52ee81
LC		 1239 goto out;
1240 }
11335a55 1241
5bcae31d
MK		 1242 list_for_each_entry(sdata, &ctx->reserved_vifs,
1243 reserved_chanctx_list) {
1244 if (!ieee80211_vif_has_in_place_reservation(
1245 sdata))
1246 continue;
1247
1248 old_ctx = ieee80211_vif_get_chanctx(sdata);
1249 vif_chsw[i].vif = &sdata->vif;
1250 vif_chsw[i].old_ctx = &old_ctx->conf;
1251 vif_chsw[i].new_ctx = &ctx->conf;
1252
1253 i++;
1254 }
5d52ee81 1255 }
11335a55 1256
5bcae31d
MK		 1257 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1258 CHANCTX_SWMODE_SWAP_CONTEXTS);
73da7d5b 1259
11335a55 1260out:
5bcae31d
MK		 1261 kfree(vif_chsw);
1262 return err;
1263}
1264
1265static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1266{
1267 struct ieee80211_chanctx *ctx;
1268 int err;
1269
1270 lockdep_assert_held(&local->mtx);
1271 lockdep_assert_held(&local->chanctx_mtx);
1272
1273 list_for_each_entry(ctx, &local->chanctx_list, list) {
1274 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1275 continue;
1276
1277 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1278 continue;
1279
1280 ieee80211_del_chanctx(local, ctx->replace_ctx);
1281 err = ieee80211_add_chanctx(local, ctx);
1282 if (err)
1283 goto err;
1284 }
1285
1286 return 0;
1287
1288err:
1289 WARN_ON(ieee80211_add_chanctx(local, ctx));
1290 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1291 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1292 continue;
1293
1294 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1295 continue;
1296
1297 ieee80211_del_chanctx(local, ctx);
1298 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1299 }
1300
1301 return err;
1302}
1303
1304int
1305ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1306{
1307 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1308 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1309 struct ieee80211_chanctx *new_ctx = NULL;
1310 int i, err, n_assigned, n_reserved, n_ready;
1311 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1312
1313 lockdep_assert_held(&local->mtx);
1314 lockdep_assert_held(&local->chanctx_mtx);
1315
1316 /*
1317 * If there are 2 independent pairs of channel contexts performing
1318 * cross-switch of their vifs this code will still wait until both are
1319 * ready even though it could be possible to switch one before the
1320 * other is ready.
1321 *
1322 * For practical reasons and code simplicity just do a single huge
1323 * switch.
1324 */
1325
1326 /*
1327 * Verify if the reservation is still feasible.
1328 * - if it's not then disconnect
1329 * - if it is but not all vifs necessary are ready then defer
1330 */
1331
1332 list_for_each_entry(ctx, &local->chanctx_list, list) {
1333 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1334 continue;
1335
1336 if (WARN_ON(!ctx->replace_ctx)) {
1337 err = -EINVAL;
1338 goto err;
1339 }
1340
1341 if (!local->use_chanctx)
1342 new_ctx = ctx;
1343
1344 n_ctx++;
1345
1346 n_assigned = 0;
1347 n_reserved = 0;
1348 n_ready = 0;
1349
1350 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1351 assigned_chanctx_list) {
1352 n_assigned++;
1353 if (sdata->reserved_chanctx) {
1354 n_reserved++;
1355 if (sdata->reserved_ready)
1356 n_ready++;
1357 }
1358 }
1359
1360 if (n_assigned != n_reserved) {
1361 if (n_ready == n_reserved) {
1362 wiphy_info(local->hw.wiphy,
1363 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1364 err = -EBUSY;
1365 goto err;
1366 }
1367
1368 return -EAGAIN;
1369 }
1370
1371 ctx->conf.radar_enabled = false;
1372 list_for_each_entry(sdata, &ctx->reserved_vifs,
1373 reserved_chanctx_list) {
1374 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1375 !sdata->reserved_ready)
1376 return -EAGAIN;
1377
1378 old_ctx = ieee80211_vif_get_chanctx(sdata);
1379 if (old_ctx) {
1380 if (old_ctx->replace_state ==
1381 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1382 n_vifs_switch++;
1383 else
1384 n_vifs_assign++;
1385 } else {
1386 n_vifs_ctxless++;
1387 }
1388
1389 if (sdata->reserved_radar_required)
1390 ctx->conf.radar_enabled = true;
1391 }
1392 }
1393
1394 if (WARN_ON(n_ctx == 0) ||
1395 WARN_ON(n_vifs_switch == 0 &&
1396 n_vifs_assign == 0 &&
1397 n_vifs_ctxless == 0) ||
1398 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1399 WARN_ON(!new_ctx && !local->use_chanctx)) {
1400 err = -EINVAL;
1401 goto err;
1402 }
1403
1404 /*
1405 * All necessary vifs are ready. Perform the switch now depending on
1406 * reservations and driver capabilities.
1407 */
1408
1409 if (local->use_chanctx) {
1410 if (n_vifs_switch > 0) {
1411 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1412 if (err)
1413 goto err;
1414 }
1415
1416 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1417 err = ieee80211_chsw_switch_ctxs(local);
1418 if (err)
1419 goto err;
1420 }
1421 } else {
1422 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1423 if (err)
1424 goto err;
1425 }
1426
1427 /*
1428 * Update all structures, values and pointers to point to new channel
1429 * context(s).
1430 */
1431
1432 i = 0;
1433 list_for_each_entry(ctx, &local->chanctx_list, list) {
1434 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1435 continue;
1436
1437 if (WARN_ON(!ctx->replace_ctx)) {
1438 err = -EINVAL;
1439 goto err;
1440 }
1441
1442 list_for_each_entry(sdata, &ctx->reserved_vifs,
1443 reserved_chanctx_list) {
1444 u32 changed = 0;
1445
1446 if (!ieee80211_vif_has_in_place_reservation(sdata))
1447 continue;
1448
1449 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1450
1451 if (sdata->vif.type == NL80211_IFTYPE_AP)
1452 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1453 false);
1454
1455 sdata->radar_required = sdata->reserved_radar_required;
1456
1457 if (sdata->vif.bss_conf.chandef.width !=
1458 sdata->reserved_chandef.width)
1459 changed = BSS_CHANGED_BANDWIDTH;
1460
1461 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1462 if (changed)
1463 ieee80211_bss_info_change_notify(sdata,
1464 changed);
1465
1466 ieee80211_recalc_txpower(sdata);
1467 }
1468
1469 ieee80211_recalc_chanctx_chantype(local, ctx);
1470 ieee80211_recalc_smps_chanctx(local, ctx);
1471 ieee80211_recalc_radar_chanctx(local, ctx);
1472 ieee80211_recalc_chanctx_min_def(local, ctx);
1473
1474 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1475 reserved_chanctx_list) {
1476 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1477 continue;
1478
1479 list_del(&sdata->reserved_chanctx_list);
1480 list_move(&sdata->assigned_chanctx_list,
1481 &new_ctx->assigned_vifs);
1482 sdata->reserved_chanctx = NULL;
1483 }
1484
1485 /*
1486 * This context might have been a dependency for an already
1487 * ready re-assign reservation interface that was deferred. Do
1488 * not propagate error to the caller though. The in-place
1489 * reservation for originally requested interface has already
1490 * succeeded at this point.
1491 */
1492 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1493 reserved_chanctx_list) {
1494 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1495 sdata)))
1496 continue;
1497
1498 if (WARN_ON(sdata->reserved_chanctx != ctx))
1499 continue;
1500
1501 if (!sdata->reserved_ready)
1502 continue;
1503
1504 if (ieee80211_vif_get_chanctx(sdata))
1505 err = ieee80211_vif_use_reserved_reassign(
1506 sdata);
1507 else
1508 err = ieee80211_vif_use_reserved_assign(sdata);
1509
1510 if (err) {
1511 sdata_info(sdata,
1512 "failed to finalize (re-)assign reservation (err=%d)\n",
1513 err);
1514 ieee80211_vif_unreserve_chanctx(sdata);
1515 cfg80211_stop_iface(local->hw.wiphy,
1516 &sdata->wdev,
1517 GFP_KERNEL);
1518 }
1519 }
1520 }
1521
1522 /*
1523 * Finally free old contexts
1524 */
1525
1526 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1527 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1528 continue;
1529
1530 ctx->replace_ctx->replace_ctx = NULL;
1531 ctx->replace_ctx->replace_state =
1532 IEEE80211_CHANCTX_REPLACE_NONE;
1533
1534 list_del_rcu(&ctx->list);
1535 kfree_rcu(ctx, rcu_head);
1536 }
1537
1538 return 0;
1539
1540err:
1541 list_for_each_entry(ctx, &local->chanctx_list, list) {
1542 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1543 continue;
1544
1545 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1546 reserved_chanctx_list)
1547 ieee80211_vif_unreserve_chanctx(sdata);
1548 }
1549
1550 return err;
1551}
1552
1553int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1554{
1555 struct ieee80211_local *local = sdata->local;
1556 struct ieee80211_chanctx *new_ctx;
1557 struct ieee80211_chanctx *old_ctx;
1558 int err;
1559
1560 lockdep_assert_held(&local->mtx);
1561 lockdep_assert_held(&local->chanctx_mtx);
1562
1563 new_ctx = sdata->reserved_chanctx;
1564 old_ctx = ieee80211_vif_get_chanctx(sdata);
1565
1566 if (WARN_ON(!new_ctx))
1567 return -EINVAL;
1568
1569 if (WARN_ON(new_ctx->replace_state ==
1570 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1571 return -EINVAL;
1572
1573 if (WARN_ON(sdata->reserved_ready))
1574 return -EINVAL;
1575
1576 sdata->reserved_ready = true;
1577
1578 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1579 if (old_ctx)
1580 err = ieee80211_vif_use_reserved_reassign(sdata);
1581 else
1582 err = ieee80211_vif_use_reserved_assign(sdata);
1583
1584 if (err)
1585 return err;
1586 }
1587
1588 /*
1589 * In-place reservation may need to be finalized now either if:
1590 * a) sdata is taking part in the swapping itself and is the last one
1591 * b) sdata has switched with a re-assign reservation to an existing
1592 * context readying in-place switching of old_ctx
1593 *
1594 * In case of (b) do not propagate the error up because the requested
1595 * sdata already switched successfully. Just spill an extra warning.
1596 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1597 * interfaces upon failure.
1598 */
1599 if ((old_ctx &&
1600 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1601 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1602 err = ieee80211_vif_use_reserved_switch(local);
1603 if (err && err != -EAGAIN) {
1604 if (new_ctx->replace_state ==
1605 IEEE80211_CHANCTX_REPLACES_OTHER)
1606 return err;
1607
1608 wiphy_info(local->hw.wiphy,
1609 "depending in-place reservation failed (err=%d)\n",
1610 err);
1611 }
1612 }
1613
1614 return 0;
73da7d5b
SW		 1615}
1616
2c9b7359
JB		 1617int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1618 const struct cfg80211_chan_def *chandef,
1619 u32 *changed)
1620{
1621 struct ieee80211_local *local = sdata->local;
1622 struct ieee80211_chanctx_conf *conf;
1623 struct ieee80211_chanctx *ctx;
5bcae31d 1624 const struct cfg80211_chan_def *compat;
2c9b7359
JB		 1625 int ret;
1626
1627 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1628 IEEE80211_CHAN_DISABLED))
1629 return -EINVAL;
1630
1631 mutex_lock(&local->chanctx_mtx);
1632 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1633 ret = 0;
1634 goto out;
1635 }
1636
1637 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1638 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1639 ret = -EINVAL;
1640 goto out;
1641 }
1642
1643 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1644 lockdep_is_held(&local->chanctx_mtx));
1645 if (!conf) {
1646 ret = -EINVAL;
1647 goto out;
1648 }
1649
1650 ctx = container_of(conf, struct ieee80211_chanctx, conf);
5bcae31d
MK		 1651
1652 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1653 if (!compat) {
2c9b7359
JB		 1654 ret = -EINVAL;
1655 goto out;
1656 }
1657
5bcae31d
MK		 1658 switch (ctx->replace_state) {
1659 case IEEE80211_CHANCTX_REPLACE_NONE:
1660 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1661 ret = -EBUSY;
1662 goto out;
1663 }
1664 break;
1665 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1666 /* TODO: Perhaps the bandwith change could be treated as a
1667 * reservation itself? */
1668 ret = -EBUSY;
1669 goto out;
1670 case IEEE80211_CHANCTX_REPLACES_OTHER:
1671 /* channel context that is going to replace another channel
1672 * context doesn't really exist and shouldn't be assigned
1673 * anywhere yet */
1674 WARN_ON(1);
1675 break;
1676 }
1677
2c9b7359
JB		 1678 sdata->vif.bss_conf.chandef = *chandef;
1679
1680 ieee80211_recalc_chanctx_chantype(local, ctx);
1681
1682 *changed |= BSS_CHANGED_BANDWIDTH;
1683 ret = 0;
1684 out:
1685 mutex_unlock(&local->chanctx_mtx);
1686 return ret;
1687}
1688
d01a1e65
MK		 1689void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1690{
55de908a
JB		 1691 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1692
34a3740d
JB		 1693 lockdep_assert_held(&sdata->local->mtx);
1694
d01a1e65
MK		 1695 mutex_lock(&sdata->local->chanctx_mtx);
1696 __ieee80211_vif_release_channel(sdata);
1697 mutex_unlock(&sdata->local->chanctx_mtx);
1698}
3448c005 1699
4d76d21b
JB		 1700void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1701{
1702 struct ieee80211_local *local = sdata->local;
1703 struct ieee80211_sub_if_data *ap;
1704 struct ieee80211_chanctx_conf *conf;
1705
1706 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1707 return;
1708
1709 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1710
1711 mutex_lock(&local->chanctx_mtx);
1712
1713 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1714 lockdep_is_held(&local->chanctx_mtx));
1715 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1716 mutex_unlock(&local->chanctx_mtx);
1717}
1718
3448c005
JB		 1719void ieee80211_iter_chan_contexts_atomic(
1720 struct ieee80211_hw *hw,
1721 void (*iter)(struct ieee80211_hw *hw,
1722 struct ieee80211_chanctx_conf *chanctx_conf,
1723 void *data),
1724 void *iter_data)
1725{
1726 struct ieee80211_local *local = hw_to_local(hw);
1727 struct ieee80211_chanctx *ctx;
1728
1729 rcu_read_lock();
1730 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
8a61af65
JB		 1731 if (ctx->driver_present)
1732 iter(hw, &ctx->conf, iter_data);
3448c005
JB		 1733 rcu_read_unlock();
1734}
1735EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
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