Commit | Line | Data |
---|---|---|
b203ffc3 JM |
1 | /* |
2 | * Off-channel operation helpers | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
bc3b2d7f | 15 | #include <linux/export.h> |
b203ffc3 JM |
16 | #include <net/mac80211.h> |
17 | #include "ieee80211_i.h" | |
2eb278e0 | 18 | #include "driver-ops.h" |
b203ffc3 JM |
19 | |
20 | /* | |
b23b025f BG |
21 | * Tell our hardware to disable PS. |
22 | * Optionally inform AP that we will go to sleep so that it will buffer | |
23 | * the frames while we are doing off-channel work. This is optional | |
24 | * because we *may* be doing work on-operating channel, and want our | |
25 | * hardware unconditionally awake, but still let the AP send us normal frames. | |
b203ffc3 | 26 | */ |
559cef99 | 27 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) |
b203ffc3 JM |
28 | { |
29 | struct ieee80211_local *local = sdata->local; | |
4730d597 | 30 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
31 | |
32 | local->offchannel_ps_enabled = false; | |
33 | ||
34 | /* FIXME: what to do when local->pspolling is true? */ | |
35 | ||
36 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 37 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
38 | del_timer_sync(&ifmgd->conn_mon_timer); |
39 | ||
b203ffc3 JM |
40 | cancel_work_sync(&local->dynamic_ps_enable_work); |
41 | ||
42 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
43 | local->offchannel_ps_enabled = true; | |
44 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
45 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
46 | } | |
47 | ||
559cef99 RM |
48 | if (!local->offchannel_ps_enabled || |
49 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) | |
b203ffc3 JM |
50 | /* |
51 | * If power save was enabled, no need to send a nullfunc | |
52 | * frame because AP knows that we are sleeping. But if the | |
53 | * hardware is creating the nullfunc frame for power save | |
54 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
55 | * enabled) and power save was enabled, the firmware just | |
56 | * sent a null frame with power save disabled. So we need | |
57 | * to send a new nullfunc frame to inform the AP that we | |
58 | * are again sleeping. | |
59 | */ | |
60 | ieee80211_send_nullfunc(local, sdata, 1); | |
61 | } | |
62 | ||
63 | /* inform AP that we are awake again, unless power save is enabled */ | |
64 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
65 | { | |
66 | struct ieee80211_local *local = sdata->local; | |
67 | ||
68 | if (!local->ps_sdata) | |
69 | ieee80211_send_nullfunc(local, sdata, 0); | |
70 | else if (local->offchannel_ps_enabled) { | |
71 | /* | |
72 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
73 | * will send a nullfunc frame with the powersave bit set | |
74 | * even though the AP already knows that we are sleeping. | |
75 | * This could be avoided by sending a null frame with power | |
76 | * save bit disabled before enabling the power save, but | |
77 | * this doesn't gain anything. | |
78 | * | |
79 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
80 | * to send a nullfunc frame because AP already knows that | |
81 | * we are sleeping, let's just enable power save mode in | |
82 | * hardware. | |
83 | */ | |
b23b025f BG |
84 | /* TODO: Only set hardware if CONF_PS changed? |
85 | * TODO: Should we set offchannel_ps_enabled to false? | |
86 | */ | |
b203ffc3 JM |
87 | local->hw.conf.flags |= IEEE80211_CONF_PS; |
88 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
89 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
90 | /* | |
91 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
92 | * had been running before leaving the operating channel, | |
93 | * restart the timer now and send a nullfunc frame to inform | |
94 | * the AP that we are awake. | |
95 | */ | |
96 | ieee80211_send_nullfunc(local, sdata, 0); | |
97 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
98 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
99 | } | |
4730d597 | 100 | |
3bc3c0d7 | 101 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 102 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
103 | } |
104 | ||
aacde9ee | 105 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local) |
b203ffc3 JM |
106 | { |
107 | struct ieee80211_sub_if_data *sdata; | |
108 | ||
fe57d9f5 JB |
109 | if (WARN_ON(local->use_chanctx)) |
110 | return; | |
111 | ||
b23b025f BG |
112 | /* |
113 | * notify the AP about us leaving the channel and stop all | |
114 | * STA interfaces. | |
115 | */ | |
6c17b77b | 116 | |
9c35d7d2 SF |
117 | /* |
118 | * Stop queues and transmit all frames queued by the driver | |
119 | * before sending nullfunc to enable powersave at the AP. | |
120 | */ | |
445ea4e8 | 121 | ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, |
6c17b77b | 122 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL); |
39ecc01d | 123 | ieee80211_flush_queues(local, NULL); |
6c17b77b | 124 | |
b203ffc3 JM |
125 | mutex_lock(&local->iflist_mtx); |
126 | list_for_each_entry(sdata, &local->interfaces, list) { | |
127 | if (!ieee80211_sdata_running(sdata)) | |
128 | continue; | |
129 | ||
f142c6b9 JB |
130 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
131 | continue; | |
132 | ||
b23b025f BG |
133 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
134 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
135 | ||
136 | /* Check to see if we should disable beaconing. */ | |
d6a83228 JB |
137 | if (sdata->vif.bss_conf.enable_beacon) { |
138 | set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, | |
139 | &sdata->state); | |
140 | sdata->vif.bss_conf.enable_beacon = false; | |
b203ffc3 JM |
141 | ieee80211_bss_info_change_notify( |
142 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 143 | } |
b203ffc3 | 144 | |
6c17b77b SF |
145 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
146 | sdata->u.mgd.associated) | |
147 | ieee80211_offchannel_ps_enable(sdata); | |
b203ffc3 JM |
148 | } |
149 | mutex_unlock(&local->iflist_mtx); | |
150 | } | |
151 | ||
aacde9ee | 152 | void ieee80211_offchannel_return(struct ieee80211_local *local) |
b203ffc3 JM |
153 | { |
154 | struct ieee80211_sub_if_data *sdata; | |
155 | ||
fe57d9f5 JB |
156 | if (WARN_ON(local->use_chanctx)) |
157 | return; | |
158 | ||
b203ffc3 JM |
159 | mutex_lock(&local->iflist_mtx); |
160 | list_for_each_entry(sdata, &local->interfaces, list) { | |
f142c6b9 JB |
161 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
162 | continue; | |
163 | ||
f6e8cb72 EP |
164 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
165 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
166 | ||
b203ffc3 JM |
167 | if (!ieee80211_sdata_running(sdata)) |
168 | continue; | |
169 | ||
170 | /* Tell AP we're back */ | |
aacde9ee SG |
171 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
172 | sdata->u.mgd.associated) | |
173 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 | 174 | |
d6a83228 JB |
175 | if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, |
176 | &sdata->state)) { | |
177 | sdata->vif.bss_conf.enable_beacon = true; | |
b203ffc3 JM |
178 | ieee80211_bss_info_change_notify( |
179 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
d6a83228 | 180 | } |
b203ffc3 JM |
181 | } |
182 | mutex_unlock(&local->iflist_mtx); | |
6c17b77b | 183 | |
445ea4e8 | 184 | ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, |
6c17b77b | 185 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL); |
b203ffc3 | 186 | } |
21f83589 | 187 | |
2eb278e0 JB |
188 | void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc) |
189 | { | |
190 | if (roc->notified) | |
191 | return; | |
192 | ||
193 | if (roc->mgmt_tx_cookie) { | |
194 | if (!WARN_ON(!roc->frame)) { | |
55de908a JB |
195 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
196 | roc->chan->band); | |
2eb278e0 JB |
197 | roc->frame = NULL; |
198 | } | |
199 | } else { | |
50febf6a | 200 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
42d97a59 JB |
201 | roc->chan, roc->req_duration, |
202 | GFP_KERNEL); | |
2eb278e0 JB |
203 | } |
204 | ||
205 | roc->notified = true; | |
206 | } | |
207 | ||
21f83589 JB |
208 | static void ieee80211_hw_roc_start(struct work_struct *work) |
209 | { | |
210 | struct ieee80211_local *local = | |
211 | container_of(work, struct ieee80211_local, hw_roc_start); | |
2eb278e0 | 212 | struct ieee80211_roc_work *roc, *dep, *tmp; |
21f83589 JB |
213 | |
214 | mutex_lock(&local->mtx); | |
215 | ||
2eb278e0 JB |
216 | if (list_empty(&local->roc_list)) |
217 | goto out_unlock; | |
21f83589 | 218 | |
2eb278e0 JB |
219 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
220 | list); | |
221 | ||
222 | if (!roc->started) | |
223 | goto out_unlock; | |
224 | ||
225 | roc->hw_begun = true; | |
226 | roc->hw_start_time = local->hw_roc_start_time; | |
90fc4b3a | 227 | |
2eb278e0 JB |
228 | ieee80211_handle_roc_started(roc); |
229 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) { | |
230 | ieee80211_handle_roc_started(dep); | |
231 | ||
232 | if (dep->duration > roc->duration) { | |
233 | u32 dur = dep->duration; | |
234 | dep->duration = dur - roc->duration; | |
235 | roc->duration = dur; | |
a4ed5346 | 236 | list_move(&dep->list, &roc->list); |
2eb278e0 JB |
237 | } |
238 | } | |
239 | out_unlock: | |
21f83589 JB |
240 | mutex_unlock(&local->mtx); |
241 | } | |
242 | ||
243 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
244 | { | |
245 | struct ieee80211_local *local = hw_to_local(hw); | |
246 | ||
2eb278e0 JB |
247 | local->hw_roc_start_time = jiffies; |
248 | ||
21f83589 JB |
249 | trace_api_ready_on_channel(local); |
250 | ||
251 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
254 | ||
2eb278e0 | 255 | void ieee80211_start_next_roc(struct ieee80211_local *local) |
21f83589 | 256 | { |
2eb278e0 | 257 | struct ieee80211_roc_work *roc; |
21f83589 | 258 | |
2eb278e0 | 259 | lockdep_assert_held(&local->mtx); |
21f83589 | 260 | |
2eb278e0 JB |
261 | if (list_empty(&local->roc_list)) { |
262 | ieee80211_run_deferred_scan(local); | |
21f83589 JB |
263 | return; |
264 | } | |
265 | ||
2eb278e0 JB |
266 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
267 | list); | |
71ecfa18 | 268 | |
0f6b3f59 JB |
269 | if (WARN_ON_ONCE(roc->started)) |
270 | return; | |
271 | ||
2eb278e0 JB |
272 | if (local->ops->remain_on_channel) { |
273 | int ret, duration = roc->duration; | |
71ecfa18 | 274 | |
2eb278e0 JB |
275 | /* XXX: duplicated, see ieee80211_start_roc_work() */ |
276 | if (!duration) | |
277 | duration = 10; | |
71ecfa18 | 278 | |
49884568 | 279 | ret = drv_remain_on_channel(local, roc->sdata, roc->chan, |
d339d5ca | 280 | duration, roc->type); |
2eb278e0 JB |
281 | |
282 | roc->started = true; | |
283 | ||
284 | if (ret) { | |
285 | wiphy_warn(local->hw.wiphy, | |
286 | "failed to start next HW ROC (%d)\n", ret); | |
287 | /* | |
288 | * queue the work struct again to avoid recursion | |
289 | * when multiple failures occur | |
290 | */ | |
291 | ieee80211_remain_on_channel_expired(&local->hw); | |
292 | } | |
293 | } else { | |
294 | /* delay it a bit */ | |
295 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
296 | round_jiffies_relative(HZ/2)); | |
297 | } | |
298 | } | |
299 | ||
3fbd45ca | 300 | void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc, bool free) |
2eb278e0 JB |
301 | { |
302 | struct ieee80211_roc_work *dep, *tmp; | |
303 | ||
3fbd45ca JB |
304 | if (WARN_ON(roc->to_be_freed)) |
305 | return; | |
306 | ||
2eb278e0 JB |
307 | /* was never transmitted */ |
308 | if (roc->frame) { | |
71bbc994 | 309 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, |
2eb278e0 JB |
310 | (unsigned long)roc->frame, |
311 | roc->frame->data, roc->frame->len, | |
312 | false, GFP_KERNEL); | |
313 | kfree_skb(roc->frame); | |
71ecfa18 JB |
314 | } |
315 | ||
2eb278e0 | 316 | if (!roc->mgmt_tx_cookie) |
71bbc994 | 317 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, |
50febf6a | 318 | roc->cookie, roc->chan, |
42d97a59 | 319 | GFP_KERNEL); |
21f83589 | 320 | |
2eb278e0 | 321 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) |
3fbd45ca | 322 | ieee80211_roc_notify_destroy(dep, true); |
2eb278e0 | 323 | |
3fbd45ca JB |
324 | if (free) |
325 | kfree(roc); | |
326 | else | |
327 | roc->to_be_freed = true; | |
2eb278e0 JB |
328 | } |
329 | ||
330 | void ieee80211_sw_roc_work(struct work_struct *work) | |
331 | { | |
332 | struct ieee80211_roc_work *roc = | |
333 | container_of(work, struct ieee80211_roc_work, work.work); | |
334 | struct ieee80211_sub_if_data *sdata = roc->sdata; | |
335 | struct ieee80211_local *local = sdata->local; | |
4b4b8229 | 336 | bool started; |
2eb278e0 JB |
337 | |
338 | mutex_lock(&local->mtx); | |
339 | ||
3fbd45ca JB |
340 | if (roc->to_be_freed) |
341 | goto out_unlock; | |
342 | ||
2eb278e0 JB |
343 | if (roc->abort) |
344 | goto finish; | |
345 | ||
346 | if (WARN_ON(list_empty(&local->roc_list))) | |
347 | goto out_unlock; | |
348 | ||
349 | if (WARN_ON(roc != list_first_entry(&local->roc_list, | |
350 | struct ieee80211_roc_work, | |
351 | list))) | |
352 | goto out_unlock; | |
353 | ||
354 | if (!roc->started) { | |
355 | struct ieee80211_roc_work *dep; | |
356 | ||
357 | /* start this ROC */ | |
21f83589 | 358 | |
2eb278e0 JB |
359 | /* switch channel etc */ |
360 | ieee80211_recalc_idle(local); | |
361 | ||
362 | local->tmp_channel = roc->chan; | |
2eb278e0 JB |
363 | ieee80211_hw_config(local, 0); |
364 | ||
365 | /* tell userspace or send frame */ | |
366 | ieee80211_handle_roc_started(roc); | |
367 | list_for_each_entry(dep, &roc->dependents, list) | |
368 | ieee80211_handle_roc_started(dep); | |
369 | ||
370 | /* if it was pure TX, just finish right away */ | |
371 | if (!roc->duration) | |
372 | goto finish; | |
373 | ||
374 | roc->started = true; | |
375 | ieee80211_queue_delayed_work(&local->hw, &roc->work, | |
376 | msecs_to_jiffies(roc->duration)); | |
377 | } else { | |
378 | /* finish this ROC */ | |
379 | finish: | |
380 | list_del(&roc->list); | |
4b4b8229 | 381 | started = roc->started; |
3fbd45ca | 382 | ieee80211_roc_notify_destroy(roc, !roc->abort); |
2eb278e0 | 383 | |
4b4b8229 | 384 | if (started) { |
39ecc01d | 385 | ieee80211_flush_queues(local, NULL); |
2eb278e0 JB |
386 | |
387 | local->tmp_channel = NULL; | |
388 | ieee80211_hw_config(local, 0); | |
389 | ||
aacde9ee | 390 | ieee80211_offchannel_return(local); |
2eb278e0 JB |
391 | } |
392 | ||
393 | ieee80211_recalc_idle(local); | |
394 | ||
4b4b8229 | 395 | if (started) |
0f6b3f59 | 396 | ieee80211_start_next_roc(local); |
22c4ceed JM |
397 | else if (list_empty(&local->roc_list)) |
398 | ieee80211_run_deferred_scan(local); | |
2eb278e0 JB |
399 | } |
400 | ||
401 | out_unlock: | |
402 | mutex_unlock(&local->mtx); | |
403 | } | |
404 | ||
405 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
406 | { | |
407 | struct ieee80211_local *local = | |
408 | container_of(work, struct ieee80211_local, hw_roc_done); | |
409 | struct ieee80211_roc_work *roc; | |
410 | ||
411 | mutex_lock(&local->mtx); | |
412 | ||
413 | if (list_empty(&local->roc_list)) | |
414 | goto out_unlock; | |
415 | ||
416 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, | |
417 | list); | |
418 | ||
419 | if (!roc->started) | |
420 | goto out_unlock; | |
421 | ||
422 | list_del(&roc->list); | |
423 | ||
3fbd45ca | 424 | ieee80211_roc_notify_destroy(roc, true); |
2eb278e0 JB |
425 | |
426 | /* if there's another roc, start it now */ | |
427 | ieee80211_start_next_roc(local); | |
428 | ||
2eb278e0 | 429 | out_unlock: |
21f83589 JB |
430 | mutex_unlock(&local->mtx); |
431 | } | |
432 | ||
433 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
434 | { | |
435 | struct ieee80211_local *local = hw_to_local(hw); | |
436 | ||
437 | trace_api_remain_on_channel_expired(local); | |
438 | ||
439 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
442 | ||
2eb278e0 | 443 | void ieee80211_roc_setup(struct ieee80211_local *local) |
21f83589 JB |
444 | { |
445 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
446 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
2eb278e0 JB |
447 | INIT_LIST_HEAD(&local->roc_list); |
448 | } | |
449 | ||
c8f994ee JB |
450 | void ieee80211_roc_purge(struct ieee80211_local *local, |
451 | struct ieee80211_sub_if_data *sdata) | |
2eb278e0 | 452 | { |
2eb278e0 JB |
453 | struct ieee80211_roc_work *roc, *tmp; |
454 | LIST_HEAD(tmp_list); | |
455 | ||
456 | mutex_lock(&local->mtx); | |
457 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { | |
c8f994ee | 458 | if (sdata && roc->sdata != sdata) |
2eb278e0 JB |
459 | continue; |
460 | ||
461 | if (roc->started && local->ops->remain_on_channel) { | |
462 | /* can race, so ignore return value */ | |
463 | drv_cancel_remain_on_channel(local); | |
464 | } | |
465 | ||
466 | list_move_tail(&roc->list, &tmp_list); | |
467 | roc->abort = true; | |
468 | } | |
2eb278e0 JB |
469 | mutex_unlock(&local->mtx); |
470 | ||
471 | list_for_each_entry_safe(roc, tmp, &tmp_list, list) { | |
472 | if (local->ops->remain_on_channel) { | |
473 | list_del(&roc->list); | |
3fbd45ca | 474 | ieee80211_roc_notify_destroy(roc, true); |
2eb278e0 JB |
475 | } else { |
476 | ieee80211_queue_delayed_work(&local->hw, &roc->work, 0); | |
477 | ||
478 | /* work will clean up etc */ | |
479 | flush_delayed_work(&roc->work); | |
3fbd45ca JB |
480 | WARN_ON(!roc->to_be_freed); |
481 | kfree(roc); | |
2eb278e0 JB |
482 | } |
483 | } | |
484 | ||
485 | WARN_ON_ONCE(!list_empty(&tmp_list)); | |
21f83589 | 486 | } |