Commit | Line | Data |
---|---|---|
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 | |
c2b90ad8 MK |
12 | static int ieee80211_num_chanctx(struct ieee80211_local *local) |
13 | { | |
14 | struct ieee80211_chanctx *ctx; | |
15 | int num = 0; | |
16 | ||
17 | lockdep_assert_held(&local->chanctx_mtx); | |
18 | ||
19 | list_for_each_entry(ctx, &local->chanctx_list, list) | |
20 | num++; | |
21 | ||
22 | return num; | |
23 | } | |
24 | ||
25 | static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) | |
26 | { | |
27 | lockdep_assert_held(&local->chanctx_mtx); | |
28 | return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); | |
29 | } | |
30 | ||
21f659bf EP |
31 | static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta) |
32 | { | |
33 | switch (sta->bandwidth) { | |
34 | case IEEE80211_STA_RX_BW_20: | |
35 | if (sta->ht_cap.ht_supported) | |
36 | return NL80211_CHAN_WIDTH_20; | |
37 | else | |
38 | return NL80211_CHAN_WIDTH_20_NOHT; | |
39 | case IEEE80211_STA_RX_BW_40: | |
40 | return NL80211_CHAN_WIDTH_40; | |
41 | case IEEE80211_STA_RX_BW_80: | |
42 | return NL80211_CHAN_WIDTH_80; | |
43 | case IEEE80211_STA_RX_BW_160: | |
44 | /* | |
45 | * This applied for both 160 and 80+80. since we use | |
46 | * the returned value to consider degradation of | |
47 | * ctx->conf.min_def, we have to make sure to take | |
48 | * the bigger one (NL80211_CHAN_WIDTH_160). | |
49 | * Otherwise we might try degrading even when not | |
50 | * needed, as the max required sta_bw returned (80+80) | |
51 | * might be smaller than the configured bw (160). | |
52 | */ | |
53 | return NL80211_CHAN_WIDTH_160; | |
54 | default: | |
55 | WARN_ON(1); | |
56 | return NL80211_CHAN_WIDTH_20; | |
57 | } | |
58 | } | |
59 | ||
60 | static enum nl80211_chan_width | |
61 | ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata) | |
62 | { | |
63 | enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; | |
64 | struct sta_info *sta; | |
65 | ||
66 | rcu_read_lock(); | |
67 | list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { | |
68 | if (sdata != sta->sdata && | |
69 | !(sta->sdata->bss && sta->sdata->bss == sdata->bss)) | |
70 | continue; | |
71 | ||
72 | if (!sta->uploaded) | |
73 | continue; | |
74 | ||
75 | max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta)); | |
76 | } | |
77 | rcu_read_unlock(); | |
78 | ||
79 | return max_bw; | |
80 | } | |
81 | ||
82 | static enum nl80211_chan_width | |
83 | ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, | |
84 | struct ieee80211_chanctx_conf *conf) | |
85 | { | |
86 | struct ieee80211_sub_if_data *sdata; | |
87 | enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; | |
88 | ||
89 | rcu_read_lock(); | |
90 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
91 | struct ieee80211_vif *vif = &sdata->vif; | |
92 | enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; | |
93 | ||
94 | if (!ieee80211_sdata_running(sdata)) | |
95 | continue; | |
96 | ||
97 | if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) | |
98 | continue; | |
99 | ||
100 | switch (vif->type) { | |
101 | case NL80211_IFTYPE_AP: | |
102 | case NL80211_IFTYPE_AP_VLAN: | |
103 | width = ieee80211_get_max_required_bw(sdata); | |
104 | break; | |
105 | case NL80211_IFTYPE_P2P_DEVICE: | |
106 | continue; | |
107 | case NL80211_IFTYPE_STATION: | |
108 | case NL80211_IFTYPE_ADHOC: | |
109 | case NL80211_IFTYPE_WDS: | |
110 | case NL80211_IFTYPE_MESH_POINT: | |
111 | width = vif->bss_conf.chandef.width; | |
112 | break; | |
113 | case NL80211_IFTYPE_UNSPECIFIED: | |
114 | case NUM_NL80211_IFTYPES: | |
115 | case NL80211_IFTYPE_MONITOR: | |
116 | case NL80211_IFTYPE_P2P_CLIENT: | |
117 | case NL80211_IFTYPE_P2P_GO: | |
118 | WARN_ON_ONCE(1); | |
119 | } | |
120 | max_bw = max(max_bw, width); | |
121 | } | |
1c37a72c EP |
122 | |
123 | /* use the configured bandwidth in case of monitor interface */ | |
124 | sdata = rcu_dereference(local->monitor_sdata); | |
125 | if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf) | |
126 | max_bw = max(max_bw, conf->def.width); | |
127 | ||
21f659bf EP |
128 | rcu_read_unlock(); |
129 | ||
130 | return max_bw; | |
131 | } | |
132 | ||
133 | /* | |
134 | * recalc the min required chan width of the channel context, which is | |
135 | * the max of min required widths of all the interfaces bound to this | |
136 | * channel context. | |
137 | */ | |
138 | void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local, | |
139 | struct ieee80211_chanctx *ctx) | |
140 | { | |
141 | enum nl80211_chan_width max_bw; | |
142 | struct cfg80211_chan_def min_def; | |
143 | ||
144 | lockdep_assert_held(&local->chanctx_mtx); | |
145 | ||
146 | /* don't optimize 5MHz, 10MHz, and radar_enabled confs */ | |
147 | if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 || | |
148 | ctx->conf.def.width == NL80211_CHAN_WIDTH_10 || | |
149 | ctx->conf.radar_enabled) { | |
150 | ctx->conf.min_def = ctx->conf.def; | |
151 | return; | |
152 | } | |
153 | ||
154 | max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf); | |
155 | ||
156 | /* downgrade chandef up to max_bw */ | |
157 | min_def = ctx->conf.def; | |
158 | while (min_def.width > max_bw) | |
159 | ieee80211_chandef_downgrade(&min_def); | |
160 | ||
161 | if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def)) | |
162 | return; | |
163 | ||
164 | ctx->conf.min_def = min_def; | |
165 | if (!ctx->driver_present) | |
166 | return; | |
167 | ||
168 | drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH); | |
169 | } | |
170 | ||
18942d3b | 171 | static void ieee80211_change_chanctx(struct ieee80211_local *local, |
4bf88530 JB |
172 | struct ieee80211_chanctx *ctx, |
173 | const struct cfg80211_chan_def *chandef) | |
23a85b45 | 174 | { |
4bf88530 | 175 | if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) |
e89a96f5 | 176 | return; |
0aaffa9b | 177 | |
4bf88530 JB |
178 | WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); |
179 | ||
180 | ctx->conf.def = *chandef; | |
181 | drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); | |
21f659bf | 182 | ieee80211_recalc_chanctx_min_def(local, ctx); |
55de908a JB |
183 | |
184 | if (!local->use_chanctx) { | |
675a0b04 | 185 | local->_oper_chandef = *chandef; |
55de908a JB |
186 | ieee80211_hw_config(local, 0); |
187 | } | |
0aaffa9b | 188 | } |
d01a1e65 | 189 | |
5d52ee81 LC |
190 | static bool ieee80211_chanctx_is_reserved(struct ieee80211_local *local, |
191 | struct ieee80211_chanctx *ctx) | |
192 | { | |
193 | struct ieee80211_sub_if_data *sdata; | |
194 | bool ret = false; | |
195 | ||
196 | lockdep_assert_held(&local->chanctx_mtx); | |
197 | rcu_read_lock(); | |
198 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
199 | if (!ieee80211_sdata_running(sdata)) | |
200 | continue; | |
201 | if (sdata->reserved_chanctx == ctx) { | |
202 | ret = true; | |
203 | break; | |
204 | } | |
205 | } | |
206 | ||
207 | rcu_read_unlock(); | |
208 | return ret; | |
209 | } | |
210 | ||
d01a1e65 MK |
211 | static struct ieee80211_chanctx * |
212 | ieee80211_find_chanctx(struct ieee80211_local *local, | |
4bf88530 | 213 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
214 | enum ieee80211_chanctx_mode mode) |
215 | { | |
216 | struct ieee80211_chanctx *ctx; | |
217 | ||
218 | lockdep_assert_held(&local->chanctx_mtx); | |
219 | ||
220 | if (mode == IEEE80211_CHANCTX_EXCLUSIVE) | |
221 | return NULL; | |
d01a1e65 MK |
222 | |
223 | list_for_each_entry(ctx, &local->chanctx_list, list) { | |
4bf88530 | 224 | const struct cfg80211_chan_def *compat; |
e89a96f5 | 225 | |
5d52ee81 LC |
226 | /* We don't support chanctx reservation for multiple |
227 | * vifs yet, so don't allow reserved chanctxs to be | |
228 | * reused. | |
229 | */ | |
230 | if ((ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) || | |
231 | ieee80211_chanctx_is_reserved(local, ctx)) | |
d01a1e65 | 232 | continue; |
4bf88530 JB |
233 | |
234 | compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); | |
235 | if (!compat) | |
d01a1e65 MK |
236 | continue; |
237 | ||
18942d3b | 238 | ieee80211_change_chanctx(local, ctx, compat); |
e89a96f5 | 239 | |
d01a1e65 MK |
240 | return ctx; |
241 | } | |
242 | ||
243 | return NULL; | |
244 | } | |
245 | ||
e4746851 SW |
246 | static bool ieee80211_is_radar_required(struct ieee80211_local *local) |
247 | { | |
248 | struct ieee80211_sub_if_data *sdata; | |
249 | ||
cc901de1 MK |
250 | lockdep_assert_held(&local->mtx); |
251 | ||
e4746851 SW |
252 | rcu_read_lock(); |
253 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
254 | if (sdata->radar_required) { | |
255 | rcu_read_unlock(); | |
256 | return true; | |
257 | } | |
258 | } | |
259 | rcu_read_unlock(); | |
260 | ||
261 | return false; | |
262 | } | |
263 | ||
d01a1e65 MK |
264 | static struct ieee80211_chanctx * |
265 | ieee80211_new_chanctx(struct ieee80211_local *local, | |
4bf88530 | 266 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
267 | enum ieee80211_chanctx_mode mode) |
268 | { | |
269 | struct ieee80211_chanctx *ctx; | |
382a103b | 270 | u32 changed; |
35f2fce9 | 271 | int err; |
d01a1e65 MK |
272 | |
273 | lockdep_assert_held(&local->chanctx_mtx); | |
274 | ||
275 | ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); | |
276 | if (!ctx) | |
277 | return ERR_PTR(-ENOMEM); | |
278 | ||
484298ad | 279 | INIT_LIST_HEAD(&ctx->assigned_vifs); |
e3afb920 | 280 | INIT_LIST_HEAD(&ctx->reserved_vifs); |
4bf88530 | 281 | ctx->conf.def = *chandef; |
04ecd257 JB |
282 | ctx->conf.rx_chains_static = 1; |
283 | ctx->conf.rx_chains_dynamic = 1; | |
d01a1e65 | 284 | ctx->mode = mode; |
e4746851 | 285 | ctx->conf.radar_enabled = ieee80211_is_radar_required(local); |
21f659bf | 286 | ieee80211_recalc_chanctx_min_def(local, ctx); |
e4746851 SW |
287 | if (!local->use_chanctx) |
288 | local->hw.conf.radar_enabled = ctx->conf.radar_enabled; | |
d01a1e65 | 289 | |
34a3740d JB |
290 | /* we hold the mutex to prevent idle from changing */ |
291 | lockdep_assert_held(&local->mtx); | |
382a103b JB |
292 | /* turn idle off *before* setting channel -- some drivers need that */ |
293 | changed = ieee80211_idle_off(local); | |
294 | if (changed) | |
295 | ieee80211_hw_config(local, changed); | |
296 | ||
55de908a | 297 | if (!local->use_chanctx) { |
675a0b04 | 298 | local->_oper_chandef = *chandef; |
55de908a JB |
299 | ieee80211_hw_config(local, 0); |
300 | } else { | |
301 | err = drv_add_chanctx(local, ctx); | |
302 | if (err) { | |
303 | kfree(ctx); | |
382a103b | 304 | ieee80211_recalc_idle(local); |
34a3740d | 305 | return ERR_PTR(err); |
55de908a | 306 | } |
35f2fce9 MK |
307 | } |
308 | ||
382a103b | 309 | /* and keep the mutex held until the new chanctx is on the list */ |
3448c005 | 310 | list_add_rcu(&ctx->list, &local->chanctx_list); |
d01a1e65 MK |
311 | |
312 | return ctx; | |
313 | } | |
314 | ||
315 | static void ieee80211_free_chanctx(struct ieee80211_local *local, | |
316 | struct ieee80211_chanctx *ctx) | |
317 | { | |
e4746851 | 318 | bool check_single_channel = false; |
d01a1e65 MK |
319 | lockdep_assert_held(&local->chanctx_mtx); |
320 | ||
321 | WARN_ON_ONCE(ctx->refcount != 0); | |
322 | ||
55de908a | 323 | if (!local->use_chanctx) { |
675a0b04 KB |
324 | struct cfg80211_chan_def *chandef = &local->_oper_chandef; |
325 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
326 | chandef->center_freq1 = chandef->chan->center_freq; | |
327 | chandef->center_freq2 = 0; | |
e4746851 SW |
328 | |
329 | /* NOTE: Disabling radar is only valid here for | |
330 | * single channel context. To be sure, check it ... | |
331 | */ | |
332 | if (local->hw.conf.radar_enabled) | |
333 | check_single_channel = true; | |
334 | local->hw.conf.radar_enabled = false; | |
335 | ||
55de908a JB |
336 | ieee80211_hw_config(local, 0); |
337 | } else { | |
338 | drv_remove_chanctx(local, ctx); | |
339 | } | |
35f2fce9 | 340 | |
3448c005 | 341 | list_del_rcu(&ctx->list); |
d01a1e65 | 342 | kfree_rcu(ctx, rcu_head); |
fd0f979a | 343 | |
e4746851 SW |
344 | /* throw a warning if this wasn't the only channel context. */ |
345 | WARN_ON(check_single_channel && !list_empty(&local->chanctx_list)); | |
346 | ||
fd0f979a | 347 | ieee80211_recalc_idle(local); |
d01a1e65 MK |
348 | } |
349 | ||
4bf88530 JB |
350 | static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, |
351 | struct ieee80211_chanctx *ctx) | |
e89a96f5 MK |
352 | { |
353 | struct ieee80211_chanctx_conf *conf = &ctx->conf; | |
354 | struct ieee80211_sub_if_data *sdata; | |
4bf88530 | 355 | const struct cfg80211_chan_def *compat = NULL; |
e89a96f5 MK |
356 | |
357 | lockdep_assert_held(&local->chanctx_mtx); | |
358 | ||
359 | rcu_read_lock(); | |
360 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
4bf88530 | 361 | |
e89a96f5 MK |
362 | if (!ieee80211_sdata_running(sdata)) |
363 | continue; | |
364 | if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) | |
365 | continue; | |
366 | ||
4bf88530 JB |
367 | if (!compat) |
368 | compat = &sdata->vif.bss_conf.chandef; | |
369 | ||
370 | compat = cfg80211_chandef_compatible( | |
371 | &sdata->vif.bss_conf.chandef, compat); | |
372 | if (!compat) | |
373 | break; | |
e89a96f5 MK |
374 | } |
375 | rcu_read_unlock(); | |
376 | ||
4bf88530 JB |
377 | if (WARN_ON_ONCE(!compat)) |
378 | return; | |
e89a96f5 | 379 | |
18942d3b | 380 | ieee80211_change_chanctx(local, ctx, compat); |
e89a96f5 MK |
381 | } |
382 | ||
367bbd10 JB |
383 | static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, |
384 | struct ieee80211_chanctx *chanctx) | |
385 | { | |
386 | bool radar_enabled; | |
387 | ||
388 | lockdep_assert_held(&local->chanctx_mtx); | |
34a3740d JB |
389 | /* for setting local->radar_detect_enabled */ |
390 | lockdep_assert_held(&local->mtx); | |
367bbd10 JB |
391 | |
392 | radar_enabled = ieee80211_is_radar_required(local); | |
393 | ||
394 | if (radar_enabled == chanctx->conf.radar_enabled) | |
395 | return; | |
396 | ||
397 | chanctx->conf.radar_enabled = radar_enabled; | |
398 | local->radar_detect_enabled = chanctx->conf.radar_enabled; | |
399 | ||
400 | if (!local->use_chanctx) { | |
401 | local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; | |
402 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
403 | } | |
404 | ||
405 | drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); | |
406 | } | |
407 | ||
77eeba97 LC |
408 | static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, |
409 | struct ieee80211_chanctx *new_ctx) | |
d01a1e65 | 410 | { |
35f2fce9 | 411 | struct ieee80211_local *local = sdata->local; |
77eeba97 LC |
412 | struct ieee80211_chanctx_conf *conf; |
413 | struct ieee80211_chanctx *curr_ctx = NULL; | |
414 | int ret = 0; | |
d01a1e65 | 415 | |
77eeba97 LC |
416 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, |
417 | lockdep_is_held(&local->chanctx_mtx)); | |
d01a1e65 | 418 | |
77eeba97 LC |
419 | if (conf) { |
420 | curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
35f2fce9 | 421 | |
77eeba97 LC |
422 | curr_ctx->refcount--; |
423 | drv_unassign_vif_chanctx(local, sdata, curr_ctx); | |
424 | conf = NULL; | |
484298ad | 425 | list_del(&sdata->assigned_chanctx_list); |
77eeba97 | 426 | } |
5bbe754d | 427 | |
77eeba97 LC |
428 | if (new_ctx) { |
429 | ret = drv_assign_vif_chanctx(local, sdata, new_ctx); | |
430 | if (ret) | |
431 | goto out; | |
432 | ||
433 | new_ctx->refcount++; | |
434 | conf = &new_ctx->conf; | |
484298ad MK |
435 | list_add(&sdata->assigned_chanctx_list, |
436 | &new_ctx->assigned_vifs); | |
77eeba97 LC |
437 | } |
438 | ||
439 | out: | |
440 | rcu_assign_pointer(sdata->vif.chanctx_conf, conf); | |
fd0f979a | 441 | |
77eeba97 LC |
442 | sdata->vif.bss_conf.idle = !conf; |
443 | ||
444 | if (curr_ctx && curr_ctx->refcount > 0) { | |
445 | ieee80211_recalc_chanctx_chantype(local, curr_ctx); | |
446 | ieee80211_recalc_smps_chanctx(local, curr_ctx); | |
447 | ieee80211_recalc_radar_chanctx(local, curr_ctx); | |
448 | ieee80211_recalc_chanctx_min_def(local, curr_ctx); | |
449 | } | |
e89a96f5 | 450 | |
77eeba97 LC |
451 | if (new_ctx && new_ctx->refcount > 0) { |
452 | ieee80211_recalc_txpower(sdata); | |
453 | ieee80211_recalc_chanctx_min_def(local, new_ctx); | |
04ecd257 | 454 | } |
77eeba97 LC |
455 | |
456 | if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && | |
457 | sdata->vif.type != NL80211_IFTYPE_MONITOR) | |
458 | ieee80211_bss_info_change_notify(sdata, | |
459 | BSS_CHANGED_IDLE); | |
460 | ||
461 | return ret; | |
d01a1e65 MK |
462 | } |
463 | ||
464 | static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) | |
465 | { | |
466 | struct ieee80211_local *local = sdata->local; | |
467 | struct ieee80211_chanctx_conf *conf; | |
468 | struct ieee80211_chanctx *ctx; | |
469 | ||
470 | lockdep_assert_held(&local->chanctx_mtx); | |
471 | ||
472 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
473 | lockdep_is_held(&local->chanctx_mtx)); | |
474 | if (!conf) | |
475 | return; | |
476 | ||
477 | ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
478 | ||
11335a55 LC |
479 | if (sdata->reserved_chanctx) |
480 | ieee80211_vif_unreserve_chanctx(sdata); | |
481 | ||
77eeba97 | 482 | ieee80211_assign_vif_chanctx(sdata, NULL); |
d01a1e65 MK |
483 | if (ctx->refcount == 0) |
484 | ieee80211_free_chanctx(local, ctx); | |
485 | } | |
486 | ||
04ecd257 JB |
487 | void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, |
488 | struct ieee80211_chanctx *chanctx) | |
489 | { | |
490 | struct ieee80211_sub_if_data *sdata; | |
491 | u8 rx_chains_static, rx_chains_dynamic; | |
492 | ||
493 | lockdep_assert_held(&local->chanctx_mtx); | |
494 | ||
495 | rx_chains_static = 1; | |
496 | rx_chains_dynamic = 1; | |
497 | ||
498 | rcu_read_lock(); | |
499 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
500 | u8 needed_static, needed_dynamic; | |
501 | ||
502 | if (!ieee80211_sdata_running(sdata)) | |
503 | continue; | |
504 | ||
505 | if (rcu_access_pointer(sdata->vif.chanctx_conf) != | |
506 | &chanctx->conf) | |
507 | continue; | |
508 | ||
509 | switch (sdata->vif.type) { | |
510 | case NL80211_IFTYPE_P2P_DEVICE: | |
511 | continue; | |
512 | case NL80211_IFTYPE_STATION: | |
513 | if (!sdata->u.mgd.associated) | |
514 | continue; | |
515 | break; | |
516 | case NL80211_IFTYPE_AP_VLAN: | |
517 | continue; | |
518 | case NL80211_IFTYPE_AP: | |
519 | case NL80211_IFTYPE_ADHOC: | |
520 | case NL80211_IFTYPE_WDS: | |
521 | case NL80211_IFTYPE_MESH_POINT: | |
522 | break; | |
523 | default: | |
524 | WARN_ON_ONCE(1); | |
525 | } | |
526 | ||
527 | switch (sdata->smps_mode) { | |
528 | default: | |
529 | WARN_ONCE(1, "Invalid SMPS mode %d\n", | |
530 | sdata->smps_mode); | |
531 | /* fall through */ | |
532 | case IEEE80211_SMPS_OFF: | |
533 | needed_static = sdata->needed_rx_chains; | |
534 | needed_dynamic = sdata->needed_rx_chains; | |
535 | break; | |
536 | case IEEE80211_SMPS_DYNAMIC: | |
537 | needed_static = 1; | |
538 | needed_dynamic = sdata->needed_rx_chains; | |
539 | break; | |
540 | case IEEE80211_SMPS_STATIC: | |
541 | needed_static = 1; | |
542 | needed_dynamic = 1; | |
543 | break; | |
544 | } | |
545 | ||
546 | rx_chains_static = max(rx_chains_static, needed_static); | |
547 | rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); | |
548 | } | |
549 | rcu_read_unlock(); | |
550 | ||
551 | if (!local->use_chanctx) { | |
552 | if (rx_chains_static > 1) | |
553 | local->smps_mode = IEEE80211_SMPS_OFF; | |
554 | else if (rx_chains_dynamic > 1) | |
555 | local->smps_mode = IEEE80211_SMPS_DYNAMIC; | |
556 | else | |
557 | local->smps_mode = IEEE80211_SMPS_STATIC; | |
558 | ieee80211_hw_config(local, 0); | |
559 | } | |
560 | ||
561 | if (rx_chains_static == chanctx->conf.rx_chains_static && | |
562 | rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) | |
563 | return; | |
564 | ||
565 | chanctx->conf.rx_chains_static = rx_chains_static; | |
566 | chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; | |
567 | drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); | |
568 | } | |
569 | ||
d01a1e65 | 570 | int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, |
4bf88530 | 571 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
572 | enum ieee80211_chanctx_mode mode) |
573 | { | |
574 | struct ieee80211_local *local = sdata->local; | |
575 | struct ieee80211_chanctx *ctx; | |
73de86a3 | 576 | u8 radar_detect_width = 0; |
d01a1e65 MK |
577 | int ret; |
578 | ||
34a3740d JB |
579 | lockdep_assert_held(&local->mtx); |
580 | ||
55de908a JB |
581 | WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); |
582 | ||
d01a1e65 | 583 | mutex_lock(&local->chanctx_mtx); |
73de86a3 LC |
584 | |
585 | ret = cfg80211_chandef_dfs_required(local->hw.wiphy, | |
586 | chandef, | |
587 | sdata->wdev.iftype); | |
588 | if (ret < 0) | |
589 | goto out; | |
590 | if (ret > 0) | |
591 | radar_detect_width = BIT(chandef->width); | |
592 | ||
593 | sdata->radar_required = ret; | |
594 | ||
595 | ret = ieee80211_check_combinations(sdata, chandef, mode, | |
596 | radar_detect_width); | |
597 | if (ret < 0) | |
598 | goto out; | |
599 | ||
d01a1e65 MK |
600 | __ieee80211_vif_release_channel(sdata); |
601 | ||
4bf88530 | 602 | ctx = ieee80211_find_chanctx(local, chandef, mode); |
d01a1e65 | 603 | if (!ctx) |
4bf88530 | 604 | ctx = ieee80211_new_chanctx(local, chandef, mode); |
d01a1e65 MK |
605 | if (IS_ERR(ctx)) { |
606 | ret = PTR_ERR(ctx); | |
607 | goto out; | |
608 | } | |
609 | ||
4bf88530 | 610 | sdata->vif.bss_conf.chandef = *chandef; |
55de908a | 611 | |
d01a1e65 MK |
612 | ret = ieee80211_assign_vif_chanctx(sdata, ctx); |
613 | if (ret) { | |
614 | /* if assign fails refcount stays the same */ | |
615 | if (ctx->refcount == 0) | |
616 | ieee80211_free_chanctx(local, ctx); | |
617 | goto out; | |
618 | } | |
619 | ||
04ecd257 | 620 | ieee80211_recalc_smps_chanctx(local, ctx); |
164eb02d | 621 | ieee80211_recalc_radar_chanctx(local, ctx); |
d01a1e65 MK |
622 | out: |
623 | mutex_unlock(&local->chanctx_mtx); | |
624 | return ret; | |
625 | } | |
626 | ||
33ffd952 LC |
627 | static int __ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata, |
628 | struct ieee80211_chanctx *ctx, | |
629 | u32 *changed) | |
73da7d5b SW |
630 | { |
631 | struct ieee80211_local *local = sdata->local; | |
33787fc4 | 632 | const struct cfg80211_chan_def *chandef = &sdata->csa_chandef; |
73da7d5b SW |
633 | u32 chanctx_changed = 0; |
634 | ||
73da7d5b SW |
635 | if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, |
636 | IEEE80211_CHAN_DISABLED)) | |
637 | return -EINVAL; | |
638 | ||
33ffd952 LC |
639 | if (ctx->refcount != 1) |
640 | return -EINVAL; | |
73da7d5b SW |
641 | |
642 | if (sdata->vif.bss_conf.chandef.width != chandef->width) { | |
643 | chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH; | |
644 | *changed |= BSS_CHANGED_BANDWIDTH; | |
645 | } | |
646 | ||
647 | sdata->vif.bss_conf.chandef = *chandef; | |
648 | ctx->conf.def = *chandef; | |
649 | ||
650 | chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL; | |
651 | drv_change_chanctx(local, ctx, chanctx_changed); | |
652 | ||
73da7d5b SW |
653 | ieee80211_recalc_chanctx_chantype(local, ctx); |
654 | ieee80211_recalc_smps_chanctx(local, ctx); | |
655 | ieee80211_recalc_radar_chanctx(local, ctx); | |
21f659bf | 656 | ieee80211_recalc_chanctx_min_def(local, ctx); |
73da7d5b | 657 | |
33ffd952 LC |
658 | return 0; |
659 | } | |
660 | ||
661 | int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata, | |
662 | u32 *changed) | |
663 | { | |
664 | struct ieee80211_local *local = sdata->local; | |
665 | struct ieee80211_chanctx_conf *conf; | |
666 | struct ieee80211_chanctx *ctx; | |
667 | int ret; | |
668 | ||
669 | lockdep_assert_held(&local->mtx); | |
670 | ||
671 | /* should never be called if not performing a channel switch. */ | |
672 | if (WARN_ON(!sdata->vif.csa_active)) | |
673 | return -EINVAL; | |
674 | ||
675 | mutex_lock(&local->chanctx_mtx); | |
676 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
677 | lockdep_is_held(&local->chanctx_mtx)); | |
678 | if (!conf) { | |
679 | ret = -EINVAL; | |
680 | goto out; | |
681 | } | |
682 | ||
683 | ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
684 | ||
685 | ret = __ieee80211_vif_change_channel(sdata, ctx, changed); | |
73da7d5b SW |
686 | out: |
687 | mutex_unlock(&local->chanctx_mtx); | |
688 | return ret; | |
689 | } | |
690 | ||
11335a55 LC |
691 | static void |
692 | __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, | |
693 | bool clear) | |
694 | { | |
695 | struct ieee80211_local *local = sdata->local; | |
696 | struct ieee80211_sub_if_data *vlan; | |
697 | struct ieee80211_chanctx_conf *conf; | |
698 | ||
699 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) | |
700 | return; | |
701 | ||
702 | lockdep_assert_held(&local->mtx); | |
703 | ||
704 | /* Check that conf exists, even when clearing this function | |
705 | * must be called with the AP's channel context still there | |
706 | * as it would otherwise cause VLANs to have an invalid | |
707 | * channel context pointer for a while, possibly pointing | |
708 | * to a channel context that has already been freed. | |
709 | */ | |
710 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
711 | lockdep_is_held(&local->chanctx_mtx)); | |
712 | WARN_ON(!conf); | |
713 | ||
714 | if (clear) | |
715 | conf = NULL; | |
716 | ||
717 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
718 | rcu_assign_pointer(vlan->vif.chanctx_conf, conf); | |
719 | } | |
720 | ||
721 | void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, | |
722 | bool clear) | |
723 | { | |
724 | struct ieee80211_local *local = sdata->local; | |
725 | ||
726 | mutex_lock(&local->chanctx_mtx); | |
727 | ||
728 | __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear); | |
729 | ||
730 | mutex_unlock(&local->chanctx_mtx); | |
731 | } | |
732 | ||
733 | int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata) | |
734 | { | |
e3afb920 MK |
735 | struct ieee80211_chanctx *ctx = sdata->reserved_chanctx; |
736 | ||
11335a55 LC |
737 | lockdep_assert_held(&sdata->local->chanctx_mtx); |
738 | ||
e3afb920 | 739 | if (WARN_ON(!ctx)) |
11335a55 LC |
740 | return -EINVAL; |
741 | ||
e3afb920 | 742 | list_del(&sdata->reserved_chanctx_list); |
11335a55 LC |
743 | sdata->reserved_chanctx = NULL; |
744 | ||
e3afb920 MK |
745 | if (--ctx->refcount == 0) |
746 | ieee80211_free_chanctx(sdata->local, ctx); | |
747 | ||
11335a55 LC |
748 | return 0; |
749 | } | |
750 | ||
751 | int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata, | |
752 | const struct cfg80211_chan_def *chandef, | |
09332481 MK |
753 | enum ieee80211_chanctx_mode mode, |
754 | bool radar_required) | |
11335a55 LC |
755 | { |
756 | struct ieee80211_local *local = sdata->local; | |
757 | struct ieee80211_chanctx_conf *conf; | |
758 | struct ieee80211_chanctx *new_ctx, *curr_ctx; | |
759 | int ret = 0; | |
760 | ||
761 | mutex_lock(&local->chanctx_mtx); | |
762 | ||
763 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
764 | lockdep_is_held(&local->chanctx_mtx)); | |
765 | if (!conf) { | |
766 | ret = -EINVAL; | |
767 | goto out; | |
768 | } | |
769 | ||
770 | curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
771 | ||
772 | /* try to find another context with the chandef we want */ | |
773 | new_ctx = ieee80211_find_chanctx(local, chandef, mode); | |
774 | if (!new_ctx) { | |
5d52ee81 LC |
775 | if (curr_ctx->refcount == 1 && |
776 | (local->hw.flags & IEEE80211_HW_CHANGE_RUNNING_CHANCTX)) { | |
777 | /* if we're the only users of the chanctx and | |
778 | * the driver supports changing a running | |
779 | * context, reserve our current context | |
780 | */ | |
781 | new_ctx = curr_ctx; | |
c2b90ad8 | 782 | } else if (ieee80211_can_create_new_chanctx(local)) { |
5d52ee81 LC |
783 | /* create a new context and reserve it */ |
784 | new_ctx = ieee80211_new_chanctx(local, chandef, mode); | |
785 | if (IS_ERR(new_ctx)) { | |
786 | ret = PTR_ERR(new_ctx); | |
787 | goto out; | |
788 | } | |
c2b90ad8 MK |
789 | } else { |
790 | ret = -EBUSY; | |
791 | goto out; | |
11335a55 LC |
792 | } |
793 | } | |
794 | ||
e3afb920 | 795 | list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs); |
11335a55 LC |
796 | new_ctx->refcount++; |
797 | sdata->reserved_chanctx = new_ctx; | |
798 | sdata->reserved_chandef = *chandef; | |
09332481 | 799 | sdata->reserved_radar_required = radar_required; |
11335a55 LC |
800 | out: |
801 | mutex_unlock(&local->chanctx_mtx); | |
802 | return ret; | |
803 | } | |
804 | ||
805 | int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata, | |
806 | u32 *changed) | |
807 | { | |
808 | struct ieee80211_local *local = sdata->local; | |
809 | struct ieee80211_chanctx *ctx; | |
810 | struct ieee80211_chanctx *old_ctx; | |
811 | struct ieee80211_chanctx_conf *conf; | |
812 | int ret; | |
813 | u32 tmp_changed = *changed; | |
814 | ||
815 | /* TODO: need to recheck if the chandef is usable etc.? */ | |
816 | ||
817 | lockdep_assert_held(&local->mtx); | |
818 | ||
819 | mutex_lock(&local->chanctx_mtx); | |
820 | ||
821 | ctx = sdata->reserved_chanctx; | |
822 | if (WARN_ON(!ctx)) { | |
823 | ret = -EINVAL; | |
824 | goto out; | |
825 | } | |
826 | ||
827 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
828 | lockdep_is_held(&local->chanctx_mtx)); | |
829 | if (!conf) { | |
830 | ret = -EINVAL; | |
831 | goto out; | |
832 | } | |
833 | ||
834 | old_ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
835 | ||
836 | if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) | |
837 | tmp_changed |= BSS_CHANGED_BANDWIDTH; | |
838 | ||
839 | sdata->vif.bss_conf.chandef = sdata->reserved_chandef; | |
840 | ||
5d52ee81 | 841 | /* unref our reservation */ |
11335a55 LC |
842 | ctx->refcount--; |
843 | sdata->reserved_chanctx = NULL; | |
09332481 | 844 | sdata->radar_required = sdata->reserved_radar_required; |
e3afb920 | 845 | list_del(&sdata->reserved_chanctx_list); |
11335a55 | 846 | |
5d52ee81 LC |
847 | if (old_ctx == ctx) { |
848 | /* This is our own context, just change it */ | |
849 | ret = __ieee80211_vif_change_channel(sdata, old_ctx, | |
850 | &tmp_changed); | |
851 | if (ret) | |
852 | goto out; | |
853 | } else { | |
854 | ret = ieee80211_assign_vif_chanctx(sdata, ctx); | |
855 | if (old_ctx->refcount == 0) | |
856 | ieee80211_free_chanctx(local, old_ctx); | |
857 | if (ret) { | |
858 | /* if assign fails refcount stays the same */ | |
859 | if (ctx->refcount == 0) | |
860 | ieee80211_free_chanctx(local, ctx); | |
861 | goto out; | |
862 | } | |
11335a55 | 863 | |
5d52ee81 LC |
864 | if (sdata->vif.type == NL80211_IFTYPE_AP) |
865 | __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); | |
866 | } | |
11335a55 LC |
867 | |
868 | *changed = tmp_changed; | |
869 | ||
870 | ieee80211_recalc_chanctx_chantype(local, ctx); | |
871 | ieee80211_recalc_smps_chanctx(local, ctx); | |
872 | ieee80211_recalc_radar_chanctx(local, ctx); | |
873 | ieee80211_recalc_chanctx_min_def(local, ctx); | |
874 | out: | |
875 | mutex_unlock(&local->chanctx_mtx); | |
876 | return ret; | |
877 | } | |
878 | ||
2c9b7359 JB |
879 | int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, |
880 | const struct cfg80211_chan_def *chandef, | |
881 | u32 *changed) | |
882 | { | |
883 | struct ieee80211_local *local = sdata->local; | |
884 | struct ieee80211_chanctx_conf *conf; | |
885 | struct ieee80211_chanctx *ctx; | |
886 | int ret; | |
887 | ||
888 | if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, | |
889 | IEEE80211_CHAN_DISABLED)) | |
890 | return -EINVAL; | |
891 | ||
892 | mutex_lock(&local->chanctx_mtx); | |
893 | if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { | |
894 | ret = 0; | |
895 | goto out; | |
896 | } | |
897 | ||
898 | if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || | |
899 | sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { | |
900 | ret = -EINVAL; | |
901 | goto out; | |
902 | } | |
903 | ||
904 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
905 | lockdep_is_held(&local->chanctx_mtx)); | |
906 | if (!conf) { | |
907 | ret = -EINVAL; | |
908 | goto out; | |
909 | } | |
910 | ||
911 | ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
912 | if (!cfg80211_chandef_compatible(&conf->def, chandef)) { | |
913 | ret = -EINVAL; | |
914 | goto out; | |
915 | } | |
916 | ||
917 | sdata->vif.bss_conf.chandef = *chandef; | |
918 | ||
919 | ieee80211_recalc_chanctx_chantype(local, ctx); | |
920 | ||
921 | *changed |= BSS_CHANGED_BANDWIDTH; | |
922 | ret = 0; | |
923 | out: | |
924 | mutex_unlock(&local->chanctx_mtx); | |
925 | return ret; | |
926 | } | |
927 | ||
d01a1e65 MK |
928 | void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) |
929 | { | |
55de908a JB |
930 | WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); |
931 | ||
34a3740d JB |
932 | lockdep_assert_held(&sdata->local->mtx); |
933 | ||
d01a1e65 MK |
934 | mutex_lock(&sdata->local->chanctx_mtx); |
935 | __ieee80211_vif_release_channel(sdata); | |
936 | mutex_unlock(&sdata->local->chanctx_mtx); | |
937 | } | |
3448c005 | 938 | |
4d76d21b JB |
939 | void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) |
940 | { | |
941 | struct ieee80211_local *local = sdata->local; | |
942 | struct ieee80211_sub_if_data *ap; | |
943 | struct ieee80211_chanctx_conf *conf; | |
944 | ||
945 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) | |
946 | return; | |
947 | ||
948 | ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); | |
949 | ||
950 | mutex_lock(&local->chanctx_mtx); | |
951 | ||
952 | conf = rcu_dereference_protected(ap->vif.chanctx_conf, | |
953 | lockdep_is_held(&local->chanctx_mtx)); | |
954 | rcu_assign_pointer(sdata->vif.chanctx_conf, conf); | |
955 | mutex_unlock(&local->chanctx_mtx); | |
956 | } | |
957 | ||
3448c005 JB |
958 | void ieee80211_iter_chan_contexts_atomic( |
959 | struct ieee80211_hw *hw, | |
960 | void (*iter)(struct ieee80211_hw *hw, | |
961 | struct ieee80211_chanctx_conf *chanctx_conf, | |
962 | void *data), | |
963 | void *iter_data) | |
964 | { | |
965 | struct ieee80211_local *local = hw_to_local(hw); | |
966 | struct ieee80211_chanctx *ctx; | |
967 | ||
968 | rcu_read_lock(); | |
969 | list_for_each_entry_rcu(ctx, &local->chanctx_list, list) | |
8a61af65 JB |
970 | if (ctx->driver_present) |
971 | iter(hw, &ctx->conf, iter_data); | |
3448c005 JB |
972 | rcu_read_unlock(); |
973 | } | |
974 | EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); |