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Merge branch 'for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[linux.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{
1d4cc30c 69 struct ieee80211_local *local __maybe_unused = sdata->local;
5bcae31d
MK		 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
0fabfaaf 193enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
21f659bf
EP		 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
21f659bf
EP		 234 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
235 }
236 rcu_read_unlock();
237
238 return max_bw;
239}
240
241static enum nl80211_chan_width
242ieee80211_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;
0fabfaaf
AN		 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;
21f659bf 273 case NL80211_IFTYPE_P2P_DEVICE:
cb3b7d87 274 case NL80211_IFTYPE_NAN:
21f659bf 275 continue;
21f659bf
EP		 276 case NL80211_IFTYPE_ADHOC:
277 case NL80211_IFTYPE_WDS:
278 case NL80211_IFTYPE_MESH_POINT:
6e0bd6c3 279 case NL80211_IFTYPE_OCB:
21f659bf
EP		 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 }
1c37a72c
EP		 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
21f659bf
EP		 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 */
307void 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
18942d3b 340static void ieee80211_change_chanctx(struct ieee80211_local *local,
4bf88530
JB		 341 struct ieee80211_chanctx *ctx,
342 const struct cfg80211_chan_def *chandef)
23a85b45 343{
aa507a7b
AN		 344 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
345 ieee80211_recalc_chanctx_min_def(local, ctx);
e89a96f5 346 return;
aa507a7b 347 }
0aaffa9b 348
4bf88530
JB		 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);
21f659bf 353 ieee80211_recalc_chanctx_min_def(local, ctx);
55de908a
JB		 354
355 if (!local->use_chanctx) {
675a0b04 356 local->_oper_chandef = *chandef;
55de908a
JB		 357 ieee80211_hw_config(local, 0);
358 }
0aaffa9b 359}
d01a1e65
MK		 360
361static struct ieee80211_chanctx *
362ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530 363 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 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;
d01a1e65
MK		 372
373 list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530 374 const struct cfg80211_chan_def *compat;
e89a96f5 375
5bcae31d
MK		 376 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
377 continue;
378
d01a1e65
MK		 379 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
380 continue;
4bf88530
JB		 381
382 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
383 if (!compat)
d01a1e65
MK		 384 continue;
385
0288157b
MK		 386 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
387 compat);
388 if (!compat)
389 continue;
390
18942d3b 391 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5 392
d01a1e65
MK		 393 return ctx;
394 }
395
396 return NULL;
397}
398
5cbc95a7 399bool ieee80211_is_radar_required(struct ieee80211_local *local)
e4746851
SW		 400{
401 struct ieee80211_sub_if_data *sdata;
402
cc901de1
MK		 403 lockdep_assert_held(&local->mtx);
404
e4746851
SW		 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
e7f2337a
EP		 417static bool
418ieee80211_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
d01a1e65 445static struct ieee80211_chanctx *
ed68ebca
MK		 446ieee80211_alloc_chanctx(struct ieee80211_local *local,
447 const struct cfg80211_chan_def *chandef,
448 enum ieee80211_chanctx_mode mode)
d01a1e65
MK		 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)
ed68ebca 456 return NULL;
d01a1e65 457
484298ad 458 INIT_LIST_HEAD(&ctx->assigned_vifs);
e3afb920 459 INIT_LIST_HEAD(&ctx->reserved_vifs);
4bf88530 460 ctx->conf.def = *chandef;
04ecd257
JB		 461 ctx->conf.rx_chains_static = 1;
462 ctx->conf.rx_chains_dynamic = 1;
d01a1e65 463 ctx->mode = mode;
e7f2337a 464 ctx->conf.radar_enabled = false;
21f659bf 465 ieee80211_recalc_chanctx_min_def(local, ctx);
ed68ebca
MK		 466
467 return ctx;
468}
469
470static 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
e4746851
SW		 479 if (!local->use_chanctx)
480 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
d01a1e65 481
382a103b
JB		 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
55de908a 487 if (!local->use_chanctx) {
ed68ebca 488 local->_oper_chandef = ctx->conf.def;
9b4816f5 489 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
55de908a
JB		 490 } else {
491 err = drv_add_chanctx(local, ctx);
492 if (err) {
382a103b 493 ieee80211_recalc_idle(local);
ed68ebca 494 return err;
55de908a 495 }
35f2fce9
MK		 496 }
497
ed68ebca
MK		 498 return 0;
499}
500
501static struct ieee80211_chanctx *
502ieee80211_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;
d01a1e65 508
ed68ebca
MK		 509 lockdep_assert_held(&local->mtx);
510 lockdep_assert_held(&local->chanctx_mtx);
d01a1e65 511
ed68ebca
MK		 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);
d01a1e65
MK		 523 return ctx;
524}
525
1f0d54cd
MK		 526static void ieee80211_del_chanctx(struct ieee80211_local *local,
527 struct ieee80211_chanctx *ctx)
d01a1e65
MK		 528{
529 lockdep_assert_held(&local->chanctx_mtx);
530
55de908a 531 if (!local->use_chanctx) {
675a0b04
KB		 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;
e4746851
SW		 536
537 /* NOTE: Disabling radar is only valid here for
538 * single channel context. To be sure, check it ...
539 */
1f0d54cd
MK		 540 WARN_ON(local->hw.conf.radar_enabled &&
541 !list_empty(&local->chanctx_list));
542
e4746851
SW		 543 local->hw.conf.radar_enabled = false;
544
9b4816f5 545 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
55de908a
JB		 546 } else {
547 drv_remove_chanctx(local, ctx);
548 }
35f2fce9 549
fd0f979a 550 ieee80211_recalc_idle(local);
d01a1e65
MK		 551}
552
1f0d54cd
MK		 553static void ieee80211_free_chanctx(struct ieee80211_local *local,
554 struct ieee80211_chanctx *ctx)
d01a1e65 555{
d01a1e65
MK		 556 lockdep_assert_held(&local->chanctx_mtx);
557
c0166da9 558 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
5bbe754d 559
1f0d54cd
MK		 560 list_del_rcu(&ctx->list);
561 ieee80211_del_chanctx(local, ctx);
562 kfree_rcu(ctx, rcu_head);
d01a1e65
MK		 563}
564
0fabfaaf
AN		 565void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
566 struct ieee80211_chanctx *ctx)
e89a96f5
MK		 567{
568 struct ieee80211_chanctx_conf *conf = &ctx->conf;
569 struct ieee80211_sub_if_data *sdata;
4bf88530 570 const struct cfg80211_chan_def *compat = NULL;
0fabfaaf 571 struct sta_info *sta;
e89a96f5
MK		 572
573 lockdep_assert_held(&local->chanctx_mtx);
574
575 rcu_read_lock();
576 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530 577
e89a96f5
MK		 578 if (!ieee80211_sdata_running(sdata))
579 continue;
580 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
581 continue;
0e67c136
FF		 582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
583 continue;
e89a96f5 584
4bf88530
JB		 585 if (!compat)
586 compat = &sdata->vif.bss_conf.chandef;
587
588 compat = cfg80211_chandef_compatible(
589 &sdata->vif.bss_conf.chandef, compat);
a00f4f6e 590 if (WARN_ON_ONCE(!compat))
4bf88530 591 break;
e89a96f5 592 }
0fabfaaf
AN		 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 }
e89a96f5
MK		 607 rcu_read_unlock();
608
a00f4f6e 609 if (!compat)
4bf88530 610 return;
e89a96f5 611
18942d3b 612 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5
MK		 613}
614
367bbd10
JB		 615static 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);
5cbc95a7 621 /* for ieee80211_is_radar_required */
34a3740d 622 lockdep_assert_held(&local->mtx);
367bbd10 623
e7f2337a 624 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
367bbd10
JB		 625
626 if (radar_enabled == chanctx->conf.radar_enabled)
627 return;
628
629 chanctx->conf.radar_enabled = radar_enabled;
367bbd10
JB		 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
77eeba97
LC		 639static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_chanctx *new_ctx)
d01a1e65 641{
35f2fce9 642 struct ieee80211_local *local = sdata->local;
77eeba97
LC		 643 struct ieee80211_chanctx_conf *conf;
644 struct ieee80211_chanctx *curr_ctx = NULL;
645 int ret = 0;
d01a1e65 646
708d50ed
AB		 647 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
648 return -ENOTSUPP;
649
77eeba97
LC		 650 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
651 lockdep_is_held(&local->chanctx_mtx));
d01a1e65 652
77eeba97
LC		 653 if (conf) {
654 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
35f2fce9 655
77eeba97
LC		 656 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
657 conf = NULL;
484298ad 658 list_del(&sdata->assigned_chanctx_list);
77eeba97 659 }
5bbe754d 660
77eeba97
LC		 661 if (new_ctx) {
662 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
663 if (ret)
664 goto out;
fd0f979a 665
77eeba97 666 conf = &new_ctx->conf;
484298ad
MK		 667 list_add(&sdata->assigned_chanctx_list,
668 &new_ctx->assigned_vifs);
77eeba97 669 }
e89a96f5 670
77eeba97
LC		 671out:
672 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
fd0f979a 673
77eeba97
LC		 674 sdata->vif.bss_conf.idle = !conf;
675
c0166da9 676 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
77eeba97
LC		 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);
04ecd257 681 }
e89a96f5 682
c0166da9 683 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
db82d8a9 684 ieee80211_recalc_txpower(sdata, false);
77eeba97 685 ieee80211_recalc_chanctx_min_def(local, new_ctx);
04ecd257 686 }
77eeba97
LC		 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
17c18bf8
JB		 693 ieee80211_check_fast_xmit_iface(sdata);
694
77eeba97 695 return ret;
d01a1e65
MK		 696}
697
04ecd257
JB		 698void 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:
cb3b7d87 722 case NL80211_IFTYPE_NAN:
04ecd257
JB		 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:
239281f8 734 case NL80211_IFTYPE_OCB:
04ecd257
JB		 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 }
7b8a9cdd
IY		 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
04ecd257
JB		 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
11335a55
LC		 790static void
791__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
792 bool clear)
793{
33926eb7 794 struct ieee80211_local *local __maybe_unused = sdata->local;
11335a55
LC		 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,
33926eb7 810 lockdep_is_held(&local->chanctx_mtx));
11335a55
LC		 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
820void 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
832int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
833{
e3afb920
MK		 834 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
835
11335a55
LC		 836 lockdep_assert_held(&sdata->local->chanctx_mtx);
837
e3afb920 838 if (WARN_ON(!ctx))
73da7d5b
SW		 839 return -EINVAL;
840
e3afb920 841 list_del(&sdata->reserved_chanctx_list);
11335a55
LC		 842 sdata->reserved_chanctx = NULL;
843
5bcae31d
MK		 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 }
e3afb920 863
11335a55
LC		 864 return 0;
865}
866
867int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
868 const struct cfg80211_chan_def *chandef,
09332481
MK		 869 enum ieee80211_chanctx_mode mode,
870 bool radar_required)
11335a55
LC		 871{
872 struct ieee80211_local *local = sdata->local;
5bcae31d 873 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
11335a55 874
5bcae31d 875 lockdep_assert_held(&local->chanctx_mtx);
73da7d5b 876
5bcae31d
MK		 877 curr_ctx = ieee80211_vif_get_chanctx(sdata);
878 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
879 return -ENOTSUPP;
11335a55 880
13f348a8 881 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
11335a55 882 if (!new_ctx) {
5bcae31d 883 if (ieee80211_can_create_new_chanctx(local)) {
5d52ee81 884 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
5bcae31d
MK		 885 if (IS_ERR(new_ctx))
886 return PTR_ERR(new_ctx);
c2b90ad8 887 } else {
5bcae31d
MK		 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);
11335a55
LC		 951 }
952 }
953
e3afb920 954 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
11335a55
LC		 955 sdata->reserved_chanctx = new_ctx;
956 sdata->reserved_chandef = *chandef;
09332481 957 sdata->reserved_radar_required = radar_required;
5bcae31d
MK		 958 sdata->reserved_ready = false;
959
960 return 0;
11335a55
LC		 961}
962
03078de4
MK		 963static void
964ieee80211_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:
6e0bd6c3 970 case NL80211_IFTYPE_OCB:
03078de4
MK		 971 ieee80211_queue_work(&sdata->local->hw,
972 &sdata->csa_finalize_work);
973 break;
03078de4 974 case NL80211_IFTYPE_STATION:
4c3ebc56
MK		 975 ieee80211_queue_work(&sdata->local->hw,
976 &sdata->u.mgd.chswitch_work);
977 break;
978 case NL80211_IFTYPE_UNSPECIFIED:
03078de4
MK		 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:
cb3b7d87 985 case NL80211_IFTYPE_NAN:
03078de4
MK		 986 case NUM_NL80211_IFTYPES:
987 WARN_ON(1);
988 break;
989 }
990}
991
2967e031
FF		 992static void
993ieee80211_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
5bcae31d
MK		 1007static int
1008ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
11335a55
LC		 1009{
1010 struct ieee80211_local *local = sdata->local;
5bcae31d
MK		 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;
11335a55
LC		 1016
1017 lockdep_assert_held(&local->mtx);
5bcae31d 1018 lockdep_assert_held(&local->chanctx_mtx);
11335a55 1019
5bcae31d
MK		 1020 new_ctx = sdata->reserved_chanctx;
1021 old_ctx = ieee80211_vif_get_chanctx(sdata);
11335a55 1022
5bcae31d
MK		 1023 if (WARN_ON(!sdata->reserved_ready))
1024 return -EBUSY;
73da7d5b 1025
5bcae31d
MK		 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
bf45a242
AO		 1041 ieee80211_change_chanctx(local, new_ctx, chandef);
1042
5bcae31d
MK		 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
03078de4 1056 goto out;
73da7d5b
SW		 1057 }
1058
5bcae31d
MK		 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
17c18bf8
JB		 1065 ieee80211_check_fast_xmit_iface(sdata);
1066
5bcae31d
MK		 1067 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1068 ieee80211_free_chanctx(local, old_ctx);
73da7d5b 1069
11335a55 1070 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
5bcae31d 1071 changed = BSS_CHANGED_BANDWIDTH;
11335a55 1072
2967e031 1073 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
11335a55 1074
722ddb0d
EG		 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
5bcae31d
MK		 1079 if (changed)
1080 ieee80211_bss_info_change_notify(sdata, changed);
1081
03078de4
MK		 1082out:
1083 ieee80211_vif_chanctx_reservation_complete(sdata);
5bcae31d
MK		 1084 return err;
1085}
1086
1087static int
1088ieee80211_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
bf45a242
AO		 1116 ieee80211_change_chanctx(local, new_ctx, chandef);
1117
e3afb920 1118 list_del(&sdata->reserved_chanctx_list);
5bcae31d 1119 sdata->reserved_chanctx = NULL;
11335a55 1120
5bcae31d
MK		 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
1129out:
03078de4 1130 ieee80211_vif_chanctx_reservation_complete(sdata);
5bcae31d
MK		 1131 return err;
1132}
1133
1134static bool
1135ieee80211_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
1159static 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
1178static 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 = kzalloc(sizeof(vif_chsw[0]) * n_vifs, 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;
5d52ee81
LC		 1200 goto out;
1201 }
11335a55 1202
5bcae31d
MK		 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 }
5d52ee81 1216 }
11335a55 1217
5bcae31d
MK		 1218 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1219 CHANCTX_SWMODE_SWAP_CONTEXTS);
73da7d5b 1220
11335a55 1221out:
5bcae31d
MK		 1222 kfree(vif_chsw);
1223 return err;
1224}
1225
1226static 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
1249err:
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
649b2a4d 1265static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
5bcae31d
MK		 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 i, 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
1392 i = 0;
1393 list_for_each_entry(ctx, &local->chanctx_list, list) {
1394 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1395 continue;
1396
1397 if (WARN_ON(!ctx->replace_ctx)) {
1398 err = -EINVAL;
1399 goto err;
1400 }
1401
1402 list_for_each_entry(sdata, &ctx->reserved_vifs,
1403 reserved_chanctx_list) {
1404 u32 changed = 0;
1405
1406 if (!ieee80211_vif_has_in_place_reservation(sdata))
1407 continue;
1408
1409 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1410
1411 if (sdata->vif.type == NL80211_IFTYPE_AP)
1412 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1413 false);
1414
17c18bf8
JB		 1415 ieee80211_check_fast_xmit_iface(sdata);
1416
5bcae31d
MK		 1417 sdata->radar_required = sdata->reserved_radar_required;
1418
1419 if (sdata->vif.bss_conf.chandef.width !=
1420 sdata->reserved_chandef.width)
1421 changed = BSS_CHANGED_BANDWIDTH;
1422
2967e031 1423 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
5bcae31d
MK		 1424 if (changed)
1425 ieee80211_bss_info_change_notify(sdata,
1426 changed);
1427
db82d8a9 1428 ieee80211_recalc_txpower(sdata, false);
5bcae31d
MK		 1429 }
1430
1431 ieee80211_recalc_chanctx_chantype(local, ctx);
1432 ieee80211_recalc_smps_chanctx(local, ctx);
1433 ieee80211_recalc_radar_chanctx(local, ctx);
1434 ieee80211_recalc_chanctx_min_def(local, ctx);
1435
1436 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1437 reserved_chanctx_list) {
1438 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1439 continue;
1440
1441 list_del(&sdata->reserved_chanctx_list);
1442 list_move(&sdata->assigned_chanctx_list,
47e4df94 1443 &ctx->assigned_vifs);
5bcae31d 1444 sdata->reserved_chanctx = NULL;
03078de4
MK		 1445
1446 ieee80211_vif_chanctx_reservation_complete(sdata);
5bcae31d
MK		 1447 }
1448
1449 /*
1450 * This context might have been a dependency for an already
1451 * ready re-assign reservation interface that was deferred. Do
1452 * not propagate error to the caller though. The in-place
1453 * reservation for originally requested interface has already
1454 * succeeded at this point.
1455 */
1456 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1457 reserved_chanctx_list) {
1458 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1459 sdata)))
1460 continue;
1461
1462 if (WARN_ON(sdata->reserved_chanctx != ctx))
1463 continue;
1464
1465 if (!sdata->reserved_ready)
1466 continue;
1467
1468 if (ieee80211_vif_get_chanctx(sdata))
1469 err = ieee80211_vif_use_reserved_reassign(
1470 sdata);
1471 else
1472 err = ieee80211_vif_use_reserved_assign(sdata);
1473
1474 if (err) {
1475 sdata_info(sdata,
1476 "failed to finalize (re-)assign reservation (err=%d)\n",
1477 err);
1478 ieee80211_vif_unreserve_chanctx(sdata);
1479 cfg80211_stop_iface(local->hw.wiphy,
1480 &sdata->wdev,
1481 GFP_KERNEL);
1482 }
1483 }
1484 }
1485
1486 /*
1487 * Finally free old contexts
1488 */
1489
1490 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1491 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1492 continue;
1493
1494 ctx->replace_ctx->replace_ctx = NULL;
1495 ctx->replace_ctx->replace_state =
1496 IEEE80211_CHANCTX_REPLACE_NONE;
1497
1498 list_del_rcu(&ctx->list);
1499 kfree_rcu(ctx, rcu_head);
1500 }
1501
1502 return 0;
1503
1504err:
1505 list_for_each_entry(ctx, &local->chanctx_list, list) {
1506 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1507 continue;
1508
1509 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
03078de4 1510 reserved_chanctx_list) {
5bcae31d 1511 ieee80211_vif_unreserve_chanctx(sdata);
03078de4
MK		 1512 ieee80211_vif_chanctx_reservation_complete(sdata);
1513 }
5bcae31d
MK		 1514 }
1515
1516 return err;
1517}
1518
649b2a4d
JB		 1519static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1520{
1521 struct ieee80211_local *local = sdata->local;
1522 struct ieee80211_chanctx_conf *conf;
1523 struct ieee80211_chanctx *ctx;
1524 bool use_reserved_switch = false;
1525
1526 lockdep_assert_held(&local->chanctx_mtx);
1527
1528 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1529 lockdep_is_held(&local->chanctx_mtx));
1530 if (!conf)
1531 return;
1532
1533 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1534
1535 if (sdata->reserved_chanctx) {
1536 if (sdata->reserved_chanctx->replace_state ==
1537 IEEE80211_CHANCTX_REPLACES_OTHER &&
1538 ieee80211_chanctx_num_reserved(local,
1539 sdata->reserved_chanctx) > 1)
1540 use_reserved_switch = true;
1541
1542 ieee80211_vif_unreserve_chanctx(sdata);
1543 }
1544
1545 ieee80211_assign_vif_chanctx(sdata, NULL);
1546 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1547 ieee80211_free_chanctx(local, ctx);
1548
104f5a62
EP		 1549 sdata->radar_required = false;
1550
649b2a4d
JB		 1551 /* Unreserving may ready an in-place reservation. */
1552 if (use_reserved_switch)
1553 ieee80211_vif_use_reserved_switch(local);
1554}
1555
1556int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1557 const struct cfg80211_chan_def *chandef,
1558 enum ieee80211_chanctx_mode mode)
1559{
1560 struct ieee80211_local *local = sdata->local;
1561 struct ieee80211_chanctx *ctx;
1562 u8 radar_detect_width = 0;
1563 int ret;
1564
1565 lockdep_assert_held(&local->mtx);
1566
1567 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1568
1569 mutex_lock(&local->chanctx_mtx);
1570
1571 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1572 chandef,
1573 sdata->wdev.iftype);
1574 if (ret < 0)
1575 goto out;
1576 if (ret > 0)
1577 radar_detect_width = BIT(chandef->width);
1578
1579 sdata->radar_required = ret;
1580
1581 ret = ieee80211_check_combinations(sdata, chandef, mode,
1582 radar_detect_width);
1583 if (ret < 0)
1584 goto out;
1585
1586 __ieee80211_vif_release_channel(sdata);
1587
1588 ctx = ieee80211_find_chanctx(local, chandef, mode);
1589 if (!ctx)
1590 ctx = ieee80211_new_chanctx(local, chandef, mode);
1591 if (IS_ERR(ctx)) {
1592 ret = PTR_ERR(ctx);
1593 goto out;
1594 }
1595
2967e031 1596 ieee80211_vif_update_chandef(sdata, chandef);
649b2a4d
JB		 1597
1598 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1599 if (ret) {
1600 /* if assign fails refcount stays the same */
1601 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1602 ieee80211_free_chanctx(local, ctx);
1603 goto out;
1604 }
1605
1606 ieee80211_recalc_smps_chanctx(local, ctx);
1607 ieee80211_recalc_radar_chanctx(local, ctx);
1608 out:
104f5a62
EP		 1609 if (ret)
1610 sdata->radar_required = false;
1611
649b2a4d
JB		 1612 mutex_unlock(&local->chanctx_mtx);
1613 return ret;
1614}
1615
5bcae31d
MK		 1616int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1617{
1618 struct ieee80211_local *local = sdata->local;
1619 struct ieee80211_chanctx *new_ctx;
1620 struct ieee80211_chanctx *old_ctx;
1621 int err;
1622
1623 lockdep_assert_held(&local->mtx);
1624 lockdep_assert_held(&local->chanctx_mtx);
1625
1626 new_ctx = sdata->reserved_chanctx;
1627 old_ctx = ieee80211_vif_get_chanctx(sdata);
1628
1629 if (WARN_ON(!new_ctx))
1630 return -EINVAL;
1631
1632 if (WARN_ON(new_ctx->replace_state ==
1633 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1634 return -EINVAL;
1635
1636 if (WARN_ON(sdata->reserved_ready))
1637 return -EINVAL;
1638
1639 sdata->reserved_ready = true;
1640
1641 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1642 if (old_ctx)
1643 err = ieee80211_vif_use_reserved_reassign(sdata);
1644 else
1645 err = ieee80211_vif_use_reserved_assign(sdata);
1646
1647 if (err)
1648 return err;
1649 }
1650
1651 /*
1652 * In-place reservation may need to be finalized now either if:
1653 * a) sdata is taking part in the swapping itself and is the last one
1654 * b) sdata has switched with a re-assign reservation to an existing
1655 * context readying in-place switching of old_ctx
1656 *
1657 * In case of (b) do not propagate the error up because the requested
1658 * sdata already switched successfully. Just spill an extra warning.
1659 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1660 * interfaces upon failure.
1661 */
1662 if ((old_ctx &&
1663 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1664 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1665 err = ieee80211_vif_use_reserved_switch(local);
1666 if (err && err != -EAGAIN) {
1667 if (new_ctx->replace_state ==
1668 IEEE80211_CHANCTX_REPLACES_OTHER)
1669 return err;
1670
1671 wiphy_info(local->hw.wiphy,
1672 "depending in-place reservation failed (err=%d)\n",
1673 err);
1674 }
1675 }
1676
1677 return 0;
73da7d5b
SW		 1678}
1679
2c9b7359
JB		 1680int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1681 const struct cfg80211_chan_def *chandef,
1682 u32 *changed)
1683{
1684 struct ieee80211_local *local = sdata->local;
1685 struct ieee80211_chanctx_conf *conf;
1686 struct ieee80211_chanctx *ctx;
5bcae31d 1687 const struct cfg80211_chan_def *compat;
2c9b7359
JB		 1688 int ret;
1689
1690 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1691 IEEE80211_CHAN_DISABLED))
1692 return -EINVAL;
1693
1694 mutex_lock(&local->chanctx_mtx);
1695 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1696 ret = 0;
1697 goto out;
1698 }
1699
1700 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1701 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1702 ret = -EINVAL;
1703 goto out;
1704 }
1705
1706 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1707 lockdep_is_held(&local->chanctx_mtx));
1708 if (!conf) {
1709 ret = -EINVAL;
1710 goto out;
1711 }
1712
1713 ctx = container_of(conf, struct ieee80211_chanctx, conf);
5bcae31d
MK		 1714
1715 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1716 if (!compat) {
2c9b7359
JB		 1717 ret = -EINVAL;
1718 goto out;
1719 }
1720
5bcae31d
MK		 1721 switch (ctx->replace_state) {
1722 case IEEE80211_CHANCTX_REPLACE_NONE:
1723 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1724 ret = -EBUSY;
1725 goto out;
1726 }
1727 break;
1728 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
d070f913 1729 /* TODO: Perhaps the bandwidth change could be treated as a
5bcae31d
MK		 1730 * reservation itself? */
1731 ret = -EBUSY;
1732 goto out;
1733 case IEEE80211_CHANCTX_REPLACES_OTHER:
1734 /* channel context that is going to replace another channel
1735 * context doesn't really exist and shouldn't be assigned
1736 * anywhere yet */
1737 WARN_ON(1);
1738 break;
1739 }
1740
2967e031 1741 ieee80211_vif_update_chandef(sdata, chandef);
2c9b7359
JB		 1742
1743 ieee80211_recalc_chanctx_chantype(local, ctx);
1744
1745 *changed |= BSS_CHANGED_BANDWIDTH;
1746 ret = 0;
1747 out:
1748 mutex_unlock(&local->chanctx_mtx);
1749 return ret;
1750}
1751
d01a1e65
MK		 1752void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1753{
55de908a
JB		 1754 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1755
34a3740d
JB		 1756 lockdep_assert_held(&sdata->local->mtx);
1757
d01a1e65
MK		 1758 mutex_lock(&sdata->local->chanctx_mtx);
1759 __ieee80211_vif_release_channel(sdata);
1760 mutex_unlock(&sdata->local->chanctx_mtx);
1761}
3448c005 1762
4d76d21b
JB		 1763void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1764{
1765 struct ieee80211_local *local = sdata->local;
1766 struct ieee80211_sub_if_data *ap;
1767 struct ieee80211_chanctx_conf *conf;
1768
1769 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1770 return;
1771
1772 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1773
1774 mutex_lock(&local->chanctx_mtx);
1775
1776 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1777 lockdep_is_held(&local->chanctx_mtx));
1778 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1779 mutex_unlock(&local->chanctx_mtx);
1780}
1781
3448c005
JB		 1782void ieee80211_iter_chan_contexts_atomic(
1783 struct ieee80211_hw *hw,
1784 void (*iter)(struct ieee80211_hw *hw,
1785 struct ieee80211_chanctx_conf *chanctx_conf,
1786 void *data),
1787 void *iter_data)
1788{
1789 struct ieee80211_local *local = hw_to_local(hw);
1790 struct ieee80211_chanctx *ctx;
1791
1792 rcu_read_lock();
1793 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
8a61af65
JB		 1794 if (ctx->driver_present)
1795 iter(hw, &ctx->conf, iter_data);
3448c005
JB		 1796 rcu_read_unlock();
1797}
1798EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
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