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135f74cd61475382dc4043eeff39e7d2ba0b9887
[deliverable/linux.git] / drivers / net / wireless / ath / ath9k / channel.c
1 /*
2 * Copyright (c) 2014 Qualcomm Atheros, Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "ath9k.h"
18
19 /* Set/change channels. If the channel is really being changed, it's done
20 * by reseting the chip. To accomplish this we must first cleanup any pending
21 * DMA, then restart stuff.
22 */
23 static int ath_set_channel(struct ath_softc *sc)
24 {
25 struct ath_hw *ah = sc->sc_ah;
26 struct ath_common *common = ath9k_hw_common(ah);
27 struct ieee80211_hw *hw = sc->hw;
28 struct ath9k_channel *hchan;
29 struct cfg80211_chan_def *chandef = &sc->cur_chan->chandef;
30 struct ieee80211_channel *chan = chandef->chan;
31 int pos = chan->hw_value;
32 int old_pos = -1;
33 int r;
34
35 if (test_bit(ATH_OP_INVALID, &common->op_flags))
36 return -EIO;
37
38 if (ah->curchan)
39 old_pos = ah->curchan - &ah->channels[0];
40
41 ath_dbg(common, CONFIG, "Set channel: %d MHz width: %d\n",
42 chan->center_freq, chandef->width);
43
44 /* update survey stats for the old channel before switching */
45 spin_lock_bh(&common->cc_lock);
46 ath_update_survey_stats(sc);
47 spin_unlock_bh(&common->cc_lock);
48
49 ath9k_cmn_get_channel(hw, ah, chandef);
50
51 /* If the operating channel changes, change the survey in-use flags
52 * along with it.
53 * Reset the survey data for the new channel, unless we're switching
54 * back to the operating channel from an off-channel operation.
55 */
56 if (!sc->cur_chan->offchannel && sc->cur_survey != &sc->survey[pos]) {
57 if (sc->cur_survey)
58 sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
59
60 sc->cur_survey = &sc->survey[pos];
61
62 memset(sc->cur_survey, 0, sizeof(struct survey_info));
63 sc->cur_survey->filled |= SURVEY_INFO_IN_USE;
64 } else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) {
65 memset(&sc->survey[pos], 0, sizeof(struct survey_info));
66 }
67
68 hchan = &sc->sc_ah->channels[pos];
69 r = ath_reset_internal(sc, hchan);
70 if (r)
71 return r;
72
73 /* The most recent snapshot of channel->noisefloor for the old
74 * channel is only available after the hardware reset. Copy it to
75 * the survey stats now.
76 */
77 if (old_pos >= 0)
78 ath_update_survey_nf(sc, old_pos);
79
80 /* Enable radar pulse detection if on a DFS channel. Spectral
81 * scanning and radar detection can not be used concurrently.
82 */
83 if (hw->conf.radar_enabled) {
84 u32 rxfilter;
85
86 rxfilter = ath9k_hw_getrxfilter(ah);
87 rxfilter |= ATH9K_RX_FILTER_PHYRADAR |
88 ATH9K_RX_FILTER_PHYERR;
89 ath9k_hw_setrxfilter(ah, rxfilter);
90 ath_dbg(common, DFS, "DFS enabled at freq %d\n",
91 chan->center_freq);
92 } else {
93 /* perform spectral scan if requested. */
94 if (test_bit(ATH_OP_SCANNING, &common->op_flags) &&
95 sc->spectral_mode == SPECTRAL_CHANSCAN)
96 ath9k_spectral_scan_trigger(hw);
97 }
98
99 return 0;
100 }
101
102 void ath_chanctx_init(struct ath_softc *sc)
103 {
104 struct ath_chanctx *ctx;
105 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
106 struct ieee80211_supported_band *sband;
107 struct ieee80211_channel *chan;
108 int i, j;
109
110 sband = &common->sbands[IEEE80211_BAND_2GHZ];
111 if (!sband->n_channels)
112 sband = &common->sbands[IEEE80211_BAND_5GHZ];
113
114 chan = &sband->channels[0];
115 for (i = 0; i < ATH9K_NUM_CHANCTX; i++) {
116 ctx = &sc->chanctx[i];
117 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
118 INIT_LIST_HEAD(&ctx->vifs);
119 ctx->txpower = ATH_TXPOWER_MAX;
120 for (j = 0; j < ARRAY_SIZE(ctx->acq); j++)
121 INIT_LIST_HEAD(&ctx->acq[j]);
122 }
123 }
124
125 void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
126 struct cfg80211_chan_def *chandef)
127 {
128 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
129 bool cur_chan;
130
131 spin_lock_bh(&sc->chan_lock);
132 if (chandef)
133 memcpy(&ctx->chandef, chandef, sizeof(*chandef));
134 cur_chan = sc->cur_chan == ctx;
135 spin_unlock_bh(&sc->chan_lock);
136
137 if (!cur_chan) {
138 ath_dbg(common, CHAN_CTX,
139 "Current context differs from the new context\n");
140 return;
141 }
142
143 ath_set_channel(sc);
144 }
145
146 #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
147
148 /**********************************************************/
149 /* Functions to handle the channel context state machine. */
150 /**********************************************************/
151
152 static const char *offchannel_state_string(enum ath_offchannel_state state)
153 {
154 switch (state) {
155 case_rtn_string(ATH_OFFCHANNEL_IDLE);
156 case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
157 case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
158 case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
159 case_rtn_string(ATH_OFFCHANNEL_ROC_START);
160 case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
161 case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
162 default:
163 return "unknown";
164 }
165 }
166
167 static const char *chanctx_event_string(enum ath_chanctx_event ev)
168 {
169 switch (ev) {
170 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
171 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
172 case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
173 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
174 case_rtn_string(ATH_CHANCTX_EVENT_AUTHORIZED);
175 case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
176 case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
177 case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
178 case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
179 case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
180 default:
181 return "unknown";
182 }
183 }
184
185 static const char *chanctx_state_string(enum ath_chanctx_state state)
186 {
187 switch (state) {
188 case_rtn_string(ATH_CHANCTX_STATE_IDLE);
189 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
190 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
191 case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
192 case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
193 default:
194 return "unknown";
195 }
196 }
197
198 void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
199 {
200 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
201 struct ath_vif *avp;
202 bool active = false;
203 u8 n_active = 0;
204
205 if (!ctx)
206 return;
207
208 list_for_each_entry(avp, &ctx->vifs, list) {
209 struct ieee80211_vif *vif = avp->vif;
210
211 switch (vif->type) {
212 case NL80211_IFTYPE_P2P_CLIENT:
213 case NL80211_IFTYPE_STATION:
214 if (avp->assoc)
215 active = true;
216 break;
217 default:
218 active = true;
219 break;
220 }
221 }
222 ctx->active = active;
223
224 ath_for_each_chanctx(sc, ctx) {
225 if (!ctx->assigned || list_empty(&ctx->vifs))
226 continue;
227 n_active++;
228 }
229
230 if (n_active <= 1) {
231 clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
232 return;
233 }
234 if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
235 return;
236
237 if (ath9k_is_chanctx_enabled()) {
238 ath_chanctx_event(sc, NULL,
239 ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
240 }
241 }
242
243 static struct ath_chanctx *
244 ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
245 {
246 int idx = ctx - &sc->chanctx[0];
247
248 return &sc->chanctx[!idx];
249 }
250
251 static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
252 {
253 struct ath_chanctx *prev, *cur;
254 struct timespec ts;
255 u32 cur_tsf, prev_tsf, beacon_int;
256 s32 offset;
257
258 beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
259
260 cur = sc->cur_chan;
261 prev = ath_chanctx_get_next(sc, cur);
262
263 if (!prev->switch_after_beacon)
264 return;
265
266 getrawmonotonic(&ts);
267 cur_tsf = (u32) cur->tsf_val +
268 ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
269
270 prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
271 prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
272
273 /* Adjust the TSF time of the AP chanctx to keep its beacons
274 * at half beacon interval offset relative to the STA chanctx.
275 */
276 offset = cur_tsf - prev_tsf;
277
278 /* Ignore stale data or spurious timestamps */
279 if (offset < 0 || offset > 3 * beacon_int)
280 return;
281
282 offset = beacon_int / 2 - (offset % beacon_int);
283 prev->tsf_val += offset;
284 }
285
286 /* Configure the TSF based hardware timer for a channel switch.
287 * Also set up backup software timer, in case the gen timer fails.
288 * This could be caused by a hardware reset.
289 */
290 static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time)
291 {
292 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
293 struct ath_hw *ah = sc->sc_ah;
294
295 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
296 tsf_time -= ath9k_hw_gettsf32(ah);
297 tsf_time = msecs_to_jiffies(tsf_time / 1000) + 1;
298 mod_timer(&sc->sched.timer, jiffies + tsf_time);
299
300 ath_dbg(common, CHAN_CTX,
301 "Setup chanctx timer with timeout: %d ms\n", jiffies_to_msecs(tsf_time));
302 }
303
304 void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
305 enum ath_chanctx_event ev)
306 {
307 struct ath_hw *ah = sc->sc_ah;
308 struct ath_common *common = ath9k_hw_common(ah);
309 struct ath_beacon_config *cur_conf;
310 struct ath_vif *avp = NULL;
311 struct ath_chanctx *ctx;
312 u32 tsf_time;
313 u32 beacon_int;
314
315 if (vif)
316 avp = (struct ath_vif *) vif->drv_priv;
317
318 spin_lock_bh(&sc->chan_lock);
319
320 ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s\n",
321 sc->cur_chan->chandef.center_freq1,
322 chanctx_event_string(ev),
323 chanctx_state_string(sc->sched.state));
324
325 switch (ev) {
326 case ATH_CHANCTX_EVENT_BEACON_PREPARE:
327 if (avp->offchannel_duration)
328 avp->offchannel_duration = 0;
329
330 if (avp->chanctx != sc->cur_chan) {
331 ath_dbg(common, CHAN_CTX,
332 "Contexts differ, not preparing beacon\n");
333 break;
334 }
335
336 if (sc->sched.offchannel_pending && !sc->sched.wait_switch) {
337 sc->sched.offchannel_pending = false;
338 sc->next_chan = &sc->offchannel.chan;
339 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
340 ath_dbg(common, CHAN_CTX,
341 "Setting offchannel_pending to false\n");
342 }
343
344 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
345 if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) {
346 sc->next_chan = ctx;
347 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
348 ath_dbg(common, CHAN_CTX,
349 "Set next context, move chanctx state to WAIT_FOR_BEACON\n");
350 }
351
352 /* if the timer missed its window, use the next interval */
353 if (sc->sched.state == ATH_CHANCTX_STATE_WAIT_FOR_TIMER) {
354 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
355 ath_dbg(common, CHAN_CTX,
356 "Move chanctx state from WAIT_FOR_TIMER to WAIT_FOR_BEACON\n");
357 }
358
359 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
360 break;
361
362 ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr);
363
364 sc->sched.beacon_pending = true;
365 sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER);
366
367 cur_conf = &sc->cur_chan->beacon;
368 beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
369
370 /* defer channel switch by a quarter beacon interval */
371 tsf_time = sc->sched.next_tbtt + beacon_int / 4;
372 sc->sched.switch_start_time = tsf_time;
373 sc->cur_chan->last_beacon = sc->sched.next_tbtt;
374
375 /*
376 * If an offchannel switch is scheduled to happen after
377 * a beacon transmission, update the NoA with one-shot
378 * values and increment the index.
379 */
380 if (sc->next_chan == &sc->offchannel.chan) {
381 avp->noa_index++;
382 avp->offchannel_start = tsf_time;
383 avp->offchannel_duration = sc->sched.offchannel_duration;
384
385 ath_dbg(common, CHAN_CTX,
386 "offchannel noa_duration: %d, noa_start: %d, noa_index: %d\n",
387 avp->offchannel_duration,
388 avp->offchannel_start,
389 avp->noa_index);
390
391 /*
392 * When multiple contexts are active, the NoA
393 * has to be recalculated and advertised after
394 * an offchannel operation.
395 */
396 if (ctx->active && avp->noa_duration)
397 avp->noa_duration = 0;
398
399 break;
400 }
401
402 /*
403 * Clear the extend_absence flag if it had been
404 * set during the previous beacon transmission,
405 * since we need to revert to the normal NoA
406 * schedule.
407 */
408 if (ctx->active && sc->sched.extend_absence) {
409 avp->noa_duration = 0;
410 sc->sched.extend_absence = false;
411 }
412
413 /* If at least two consecutive beacons were missed on the STA
414 * chanctx, stay on the STA channel for one extra beacon period,
415 * to resync the timer properly.
416 */
417 if (ctx->active && sc->sched.beacon_miss >= 2) {
418 avp->noa_duration = 0;
419 sc->sched.extend_absence = true;
420 }
421
422 /* Prevent wrap-around issues */
423 if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30))
424 avp->noa_duration = 0;
425
426 /*
427 * If multiple contexts are active, start periodic
428 * NoA and increment the index for the first
429 * announcement.
430 */
431 if (ctx->active &&
432 (!avp->noa_duration || sc->sched.force_noa_update)) {
433 avp->noa_index++;
434 avp->noa_start = tsf_time;
435
436 if (sc->sched.extend_absence)
437 avp->noa_duration = (3 * beacon_int / 2) +
438 sc->sched.channel_switch_time;
439 else
440 avp->noa_duration =
441 TU_TO_USEC(cur_conf->beacon_interval) / 2 +
442 sc->sched.channel_switch_time;
443
444 if (test_bit(ATH_OP_SCANNING, &common->op_flags) ||
445 sc->sched.extend_absence)
446 avp->periodic_noa = false;
447 else
448 avp->periodic_noa = true;
449
450 ath_dbg(common, CHAN_CTX,
451 "noa_duration: %d, noa_start: %d, noa_index: %d, periodic: %d\n",
452 avp->noa_duration,
453 avp->noa_start,
454 avp->noa_index,
455 avp->periodic_noa);
456 }
457
458 if (ctx->active && sc->sched.force_noa_update)
459 sc->sched.force_noa_update = false;
460
461 break;
462 case ATH_CHANCTX_EVENT_BEACON_SENT:
463 if (!sc->sched.beacon_pending) {
464 ath_dbg(common, CHAN_CTX,
465 "No pending beacon\n");
466 break;
467 }
468
469 sc->sched.beacon_pending = false;
470 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
471 break;
472
473 ath_dbg(common, CHAN_CTX,
474 "Move chanctx state to WAIT_FOR_TIMER\n");
475
476 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
477 ath_chanctx_setup_timer(sc, sc->sched.switch_start_time);
478 break;
479 case ATH_CHANCTX_EVENT_TSF_TIMER:
480 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER)
481 break;
482
483 if (!sc->cur_chan->switch_after_beacon &&
484 sc->sched.beacon_pending)
485 sc->sched.beacon_miss++;
486
487 ath_dbg(common, CHAN_CTX,
488 "Move chanctx state to SWITCH\n");
489
490 sc->sched.state = ATH_CHANCTX_STATE_SWITCH;
491 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
492 break;
493 case ATH_CHANCTX_EVENT_BEACON_RECEIVED:
494 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
495 sc->cur_chan == &sc->offchannel.chan)
496 break;
497
498 sc->sched.beacon_pending = false;
499 sc->sched.beacon_miss = 0;
500
501 if (sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
502 !sc->cur_chan->tsf_val)
503 break;
504
505 ath_chanctx_adjust_tbtt_delta(sc);
506
507 /* TSF time might have been updated by the incoming beacon,
508 * need update the channel switch timer to reflect the change.
509 */
510 tsf_time = sc->sched.switch_start_time;
511 tsf_time -= (u32) sc->cur_chan->tsf_val +
512 ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
513 tsf_time += ath9k_hw_gettsf32(ah);
514
515
516 ath_chanctx_setup_timer(sc, tsf_time);
517 break;
518 case ATH_CHANCTX_EVENT_AUTHORIZED:
519 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
520 avp->chanctx != sc->cur_chan)
521 break;
522
523 ath_dbg(common, CHAN_CTX,
524 "Move chanctx state from FORCE_ACTIVE to IDLE\n");
525
526 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
527 /* fall through */
528 case ATH_CHANCTX_EVENT_SWITCH:
529 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
530 sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
531 sc->cur_chan->switch_after_beacon ||
532 sc->cur_chan == &sc->offchannel.chan)
533 break;
534
535 /* If this is a station chanctx, stay active for a half
536 * beacon period (minus channel switch time)
537 */
538 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
539 cur_conf = &sc->cur_chan->beacon;
540
541 ath_dbg(common, CHAN_CTX,
542 "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
543
544 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
545 sc->sched.wait_switch = false;
546
547 tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
548
549 if (sc->sched.extend_absence) {
550 sc->sched.beacon_miss = 0;
551 tsf_time *= 3;
552 }
553
554 tsf_time -= sc->sched.channel_switch_time;
555 tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
556 sc->sched.switch_start_time = tsf_time;
557
558 ath_chanctx_setup_timer(sc, tsf_time);
559 sc->sched.beacon_pending = true;
560 break;
561 case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
562 if (sc->cur_chan == &sc->offchannel.chan ||
563 sc->cur_chan->switch_after_beacon)
564 break;
565
566 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
567 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
568 break;
569 case ATH_CHANCTX_EVENT_UNASSIGN:
570 if (sc->cur_chan->assigned) {
571 if (sc->next_chan && !sc->next_chan->assigned &&
572 sc->next_chan != &sc->offchannel.chan)
573 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
574 break;
575 }
576
577 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
578 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
579 if (!ctx->assigned)
580 break;
581
582 sc->next_chan = ctx;
583 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
584 break;
585 case ATH_CHANCTX_EVENT_ASSIGN:
586 /*
587 * When adding a new channel context, check if a scan
588 * is in progress and abort it since the addition of
589 * a new channel context is usually followed by VIF
590 * assignment, in which case we have to start multi-channel
591 * operation.
592 */
593 if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
594 ath_dbg(common, CHAN_CTX,
595 "Aborting HW scan to add new context\n");
596
597 spin_unlock_bh(&sc->chan_lock);
598 del_timer_sync(&sc->offchannel.timer);
599 ath_scan_complete(sc, true);
600 spin_lock_bh(&sc->chan_lock);
601 }
602 break;
603 case ATH_CHANCTX_EVENT_CHANGE:
604 break;
605 }
606
607 spin_unlock_bh(&sc->chan_lock);
608 }
609
610 void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
611 enum ath_chanctx_event ev)
612 {
613 if (sc->sched.beacon_pending)
614 ath_chanctx_event(sc, NULL, ev);
615 }
616
617 void ath_chanctx_beacon_recv_ev(struct ath_softc *sc,
618 enum ath_chanctx_event ev)
619 {
620 ath_chanctx_event(sc, NULL, ev);
621 }
622
623 static int ath_scan_channel_duration(struct ath_softc *sc,
624 struct ieee80211_channel *chan)
625 {
626 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
627
628 if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
629 return (HZ / 9); /* ~110 ms */
630
631 return (HZ / 16); /* ~60 ms */
632 }
633
634 static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
635 struct cfg80211_chan_def *chandef)
636 {
637 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
638
639 spin_lock_bh(&sc->chan_lock);
640
641 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
642 (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
643 if (chandef)
644 ctx->chandef = *chandef;
645
646 sc->sched.offchannel_pending = true;
647 sc->sched.wait_switch = true;
648 sc->sched.offchannel_duration =
649 jiffies_to_usecs(sc->offchannel.duration) +
650 sc->sched.channel_switch_time;
651
652 spin_unlock_bh(&sc->chan_lock);
653 ath_dbg(common, CHAN_CTX,
654 "Set offchannel_pending to true\n");
655 return;
656 }
657
658 sc->next_chan = ctx;
659 if (chandef) {
660 ctx->chandef = *chandef;
661 ath_dbg(common, CHAN_CTX,
662 "Assigned next_chan to %d MHz\n", chandef->center_freq1);
663 }
664
665 if (sc->next_chan == &sc->offchannel.chan) {
666 sc->sched.offchannel_duration =
667 jiffies_to_usecs(sc->offchannel.duration) +
668 sc->sched.channel_switch_time;
669
670 if (chandef) {
671 ath_dbg(common, CHAN_CTX,
672 "Offchannel duration for chan %d MHz : %u\n",
673 chandef->center_freq1,
674 sc->sched.offchannel_duration);
675 }
676 }
677 spin_unlock_bh(&sc->chan_lock);
678 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
679 }
680
681 static void ath_chanctx_offchan_switch(struct ath_softc *sc,
682 struct ieee80211_channel *chan)
683 {
684 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
685 struct cfg80211_chan_def chandef;
686
687 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
688 ath_dbg(common, CHAN_CTX,
689 "Channel definition created: %d MHz\n", chandef.center_freq1);
690
691 ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
692 }
693
694 static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
695 bool active)
696 {
697 struct ath_chanctx *ctx;
698
699 ath_for_each_chanctx(sc, ctx) {
700 if (!ctx->assigned || list_empty(&ctx->vifs))
701 continue;
702 if (active && !ctx->active)
703 continue;
704
705 if (ctx->switch_after_beacon)
706 return ctx;
707 }
708
709 return &sc->chanctx[0];
710 }
711
712 static void
713 ath_scan_next_channel(struct ath_softc *sc)
714 {
715 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
716 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
717 struct ieee80211_channel *chan;
718
719 if (sc->offchannel.scan_idx >= req->n_channels) {
720 ath_dbg(common, CHAN_CTX,
721 "Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
722 "scan_idx: %d, n_channels: %d\n",
723 sc->offchannel.scan_idx,
724 req->n_channels);
725
726 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
727 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
728 NULL);
729 return;
730 }
731
732 ath_dbg(common, CHAN_CTX,
733 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
734 sc->offchannel.scan_idx);
735
736 chan = req->channels[sc->offchannel.scan_idx++];
737 sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
738 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
739
740 ath_chanctx_offchan_switch(sc, chan);
741 }
742
743 void ath_offchannel_next(struct ath_softc *sc)
744 {
745 struct ieee80211_vif *vif;
746
747 if (sc->offchannel.scan_req) {
748 vif = sc->offchannel.scan_vif;
749 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
750 ath_scan_next_channel(sc);
751 } else if (sc->offchannel.roc_vif) {
752 vif = sc->offchannel.roc_vif;
753 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
754 sc->offchannel.duration =
755 msecs_to_jiffies(sc->offchannel.roc_duration);
756 sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
757 ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
758 } else {
759 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
760 NULL);
761 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
762 if (sc->ps_idle)
763 ath_cancel_work(sc);
764 }
765 }
766
767 void ath_roc_complete(struct ath_softc *sc, bool abort)
768 {
769 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
770
771 if (abort)
772 ath_dbg(common, CHAN_CTX, "RoC aborted\n");
773 else
774 ath_dbg(common, CHAN_CTX, "RoC expired\n");
775
776 sc->offchannel.roc_vif = NULL;
777 sc->offchannel.roc_chan = NULL;
778 if (!abort)
779 ieee80211_remain_on_channel_expired(sc->hw);
780 ath_offchannel_next(sc);
781 ath9k_ps_restore(sc);
782 }
783
784 void ath_scan_complete(struct ath_softc *sc, bool abort)
785 {
786 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
787
788 if (abort)
789 ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
790 else
791 ath_dbg(common, CHAN_CTX, "HW scan complete\n");
792
793 sc->offchannel.scan_req = NULL;
794 sc->offchannel.scan_vif = NULL;
795 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
796 ieee80211_scan_completed(sc->hw, abort);
797 clear_bit(ATH_OP_SCANNING, &common->op_flags);
798 spin_lock_bh(&sc->chan_lock);
799 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
800 sc->sched.force_noa_update = true;
801 spin_unlock_bh(&sc->chan_lock);
802 ath_offchannel_next(sc);
803 ath9k_ps_restore(sc);
804 }
805
806 static void ath_scan_send_probe(struct ath_softc *sc,
807 struct cfg80211_ssid *ssid)
808 {
809 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
810 struct ieee80211_vif *vif = sc->offchannel.scan_vif;
811 struct ath_tx_control txctl = {};
812 struct sk_buff *skb;
813 struct ieee80211_tx_info *info;
814 int band = sc->offchannel.chan.chandef.chan->band;
815
816 skb = ieee80211_probereq_get(sc->hw, vif,
817 ssid->ssid, ssid->ssid_len, req->ie_len);
818 if (!skb)
819 return;
820
821 info = IEEE80211_SKB_CB(skb);
822 if (req->no_cck)
823 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
824
825 if (req->ie_len)
826 memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
827
828 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
829
830 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
831 goto error;
832
833 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
834 txctl.force_channel = true;
835 if (ath_tx_start(sc->hw, skb, &txctl))
836 goto error;
837
838 return;
839
840 error:
841 ieee80211_free_txskb(sc->hw, skb);
842 }
843
844 static void ath_scan_channel_start(struct ath_softc *sc)
845 {
846 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
847 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
848 int i;
849
850 if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
851 req->n_ssids) {
852 for (i = 0; i < req->n_ssids; i++)
853 ath_scan_send_probe(sc, &req->ssids[i]);
854
855 }
856
857 ath_dbg(common, CHAN_CTX,
858 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
859
860 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
861 mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
862 }
863
864 static void ath_chanctx_timer(unsigned long data)
865 {
866 struct ath_softc *sc = (struct ath_softc *) data;
867 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
868
869 ath_dbg(common, CHAN_CTX,
870 "Channel context timer invoked\n");
871
872 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
873 }
874
875 static void ath_offchannel_timer(unsigned long data)
876 {
877 struct ath_softc *sc = (struct ath_softc *)data;
878 struct ath_chanctx *ctx;
879 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
880
881 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
882 __func__, offchannel_state_string(sc->offchannel.state));
883
884 switch (sc->offchannel.state) {
885 case ATH_OFFCHANNEL_PROBE_WAIT:
886 if (!sc->offchannel.scan_req)
887 return;
888
889 /* get first active channel context */
890 ctx = ath_chanctx_get_oper_chan(sc, true);
891 if (ctx->active) {
892 ath_dbg(common, CHAN_CTX,
893 "Switch to oper/active context, "
894 "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
895
896 sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
897 ath_chanctx_switch(sc, ctx, NULL);
898 mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
899 break;
900 }
901 /* fall through */
902 case ATH_OFFCHANNEL_SUSPEND:
903 if (!sc->offchannel.scan_req)
904 return;
905
906 ath_scan_next_channel(sc);
907 break;
908 case ATH_OFFCHANNEL_ROC_START:
909 case ATH_OFFCHANNEL_ROC_WAIT:
910 ctx = ath_chanctx_get_oper_chan(sc, false);
911 sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
912 ath_chanctx_switch(sc, ctx, NULL);
913 break;
914 default:
915 break;
916 }
917 }
918
919 static bool
920 ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
921 bool powersave)
922 {
923 struct ieee80211_vif *vif = avp->vif;
924 struct ieee80211_sta *sta = NULL;
925 struct ieee80211_hdr_3addr *nullfunc;
926 struct ath_tx_control txctl;
927 struct sk_buff *skb;
928 int band = sc->cur_chan->chandef.chan->band;
929
930 switch (vif->type) {
931 case NL80211_IFTYPE_STATION:
932 if (!avp->assoc)
933 return false;
934
935 skb = ieee80211_nullfunc_get(sc->hw, vif);
936 if (!skb)
937 return false;
938
939 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
940 if (powersave)
941 nullfunc->frame_control |=
942 cpu_to_le16(IEEE80211_FCTL_PM);
943
944 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
945 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
946 dev_kfree_skb_any(skb);
947 return false;
948 }
949 break;
950 default:
951 return false;
952 }
953
954 memset(&txctl, 0, sizeof(txctl));
955 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
956 txctl.sta = sta;
957 txctl.force_channel = true;
958 if (ath_tx_start(sc->hw, skb, &txctl)) {
959 ieee80211_free_txskb(sc->hw, skb);
960 return false;
961 }
962
963 return true;
964 }
965
966 static bool
967 ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
968 {
969 struct ath_vif *avp;
970 bool sent = false;
971
972 rcu_read_lock();
973 list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
974 if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
975 sent = true;
976 }
977 rcu_read_unlock();
978
979 return sent;
980 }
981
982 static bool ath_chanctx_defer_switch(struct ath_softc *sc)
983 {
984 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
985
986 if (sc->cur_chan == &sc->offchannel.chan)
987 return false;
988
989 switch (sc->sched.state) {
990 case ATH_CHANCTX_STATE_SWITCH:
991 return false;
992 case ATH_CHANCTX_STATE_IDLE:
993 if (!sc->cur_chan->switch_after_beacon)
994 return false;
995
996 ath_dbg(common, CHAN_CTX,
997 "Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
998
999 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
1000 break;
1001 default:
1002 break;
1003 }
1004
1005 return true;
1006 }
1007
1008 static void ath_offchannel_channel_change(struct ath_softc *sc)
1009 {
1010 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1011
1012 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
1013 __func__, offchannel_state_string(sc->offchannel.state));
1014
1015 switch (sc->offchannel.state) {
1016 case ATH_OFFCHANNEL_PROBE_SEND:
1017 if (!sc->offchannel.scan_req)
1018 return;
1019
1020 if (sc->cur_chan->chandef.chan !=
1021 sc->offchannel.chan.chandef.chan)
1022 return;
1023
1024 ath_scan_channel_start(sc);
1025 break;
1026 case ATH_OFFCHANNEL_IDLE:
1027 if (!sc->offchannel.scan_req)
1028 return;
1029
1030 ath_scan_complete(sc, false);
1031 break;
1032 case ATH_OFFCHANNEL_ROC_START:
1033 if (sc->cur_chan != &sc->offchannel.chan)
1034 break;
1035
1036 sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
1037 mod_timer(&sc->offchannel.timer,
1038 jiffies + sc->offchannel.duration);
1039 ieee80211_ready_on_channel(sc->hw);
1040 break;
1041 case ATH_OFFCHANNEL_ROC_DONE:
1042 ath_roc_complete(sc, false);
1043 break;
1044 default:
1045 break;
1046 }
1047 }
1048
1049 void ath_chanctx_set_next(struct ath_softc *sc, bool force)
1050 {
1051 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1052 struct ath_chanctx *old_ctx;
1053 struct timespec ts;
1054 bool measure_time = false;
1055 bool send_ps = false;
1056 bool queues_stopped = false;
1057
1058 spin_lock_bh(&sc->chan_lock);
1059 if (!sc->next_chan) {
1060 spin_unlock_bh(&sc->chan_lock);
1061 return;
1062 }
1063
1064 if (!force && ath_chanctx_defer_switch(sc)) {
1065 spin_unlock_bh(&sc->chan_lock);
1066 return;
1067 }
1068
1069 ath_dbg(common, CHAN_CTX,
1070 "%s: current: %d MHz, next: %d MHz\n",
1071 __func__,
1072 sc->cur_chan->chandef.center_freq1,
1073 sc->next_chan->chandef.center_freq1);
1074
1075 if (sc->cur_chan != sc->next_chan) {
1076 ath_dbg(common, CHAN_CTX,
1077 "Stopping current chanctx: %d\n",
1078 sc->cur_chan->chandef.center_freq1);
1079 sc->cur_chan->stopped = true;
1080 spin_unlock_bh(&sc->chan_lock);
1081
1082 if (sc->next_chan == &sc->offchannel.chan) {
1083 getrawmonotonic(&ts);
1084 measure_time = true;
1085 }
1086
1087 ath9k_chanctx_stop_queues(sc, sc->cur_chan);
1088 queues_stopped = true;
1089
1090 __ath9k_flush(sc->hw, ~0, true);
1091
1092 if (ath_chanctx_send_ps_frame(sc, true))
1093 __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false);
1094
1095 send_ps = true;
1096 spin_lock_bh(&sc->chan_lock);
1097
1098 if (sc->cur_chan != &sc->offchannel.chan) {
1099 getrawmonotonic(&sc->cur_chan->tsf_ts);
1100 sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
1101 }
1102 }
1103 old_ctx = sc->cur_chan;
1104 sc->cur_chan = sc->next_chan;
1105 sc->cur_chan->stopped = false;
1106 sc->next_chan = NULL;
1107
1108 if (!sc->sched.offchannel_pending)
1109 sc->sched.offchannel_duration = 0;
1110
1111 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
1112 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
1113
1114 spin_unlock_bh(&sc->chan_lock);
1115
1116 if (sc->sc_ah->chip_fullsleep ||
1117 memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
1118 sizeof(sc->cur_chandef))) {
1119 ath_dbg(common, CHAN_CTX,
1120 "%s: Set channel %d MHz\n",
1121 __func__, sc->cur_chan->chandef.center_freq1);
1122 ath_set_channel(sc);
1123 if (measure_time)
1124 sc->sched.channel_switch_time =
1125 ath9k_hw_get_tsf_offset(&ts, NULL);
1126 /*
1127 * A reset will ensure that all queues are woken up,
1128 * so there is no need to awaken them again.
1129 */
1130 goto out;
1131 }
1132
1133 if (queues_stopped)
1134 ath9k_chanctx_wake_queues(sc, old_ctx);
1135 out:
1136 if (send_ps)
1137 ath_chanctx_send_ps_frame(sc, false);
1138
1139 ath_offchannel_channel_change(sc);
1140 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
1141 }
1142
1143 static void ath_chanctx_work(struct work_struct *work)
1144 {
1145 struct ath_softc *sc = container_of(work, struct ath_softc,
1146 chanctx_work);
1147 mutex_lock(&sc->mutex);
1148 ath_chanctx_set_next(sc, false);
1149 mutex_unlock(&sc->mutex);
1150 }
1151
1152 void ath9k_offchannel_init(struct ath_softc *sc)
1153 {
1154 struct ath_chanctx *ctx;
1155 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1156 struct ieee80211_supported_band *sband;
1157 struct ieee80211_channel *chan;
1158 int i;
1159
1160 sband = &common->sbands[IEEE80211_BAND_2GHZ];
1161 if (!sband->n_channels)
1162 sband = &common->sbands[IEEE80211_BAND_5GHZ];
1163
1164 chan = &sband->channels[0];
1165
1166 ctx = &sc->offchannel.chan;
1167 INIT_LIST_HEAD(&ctx->vifs);
1168 ctx->txpower = ATH_TXPOWER_MAX;
1169 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
1170
1171 for (i = 0; i < ARRAY_SIZE(ctx->acq); i++)
1172 INIT_LIST_HEAD(&ctx->acq[i]);
1173
1174 sc->offchannel.chan.offchannel = true;
1175 }
1176
1177 void ath9k_init_channel_context(struct ath_softc *sc)
1178 {
1179 INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
1180
1181 setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
1182 (unsigned long)sc);
1183 setup_timer(&sc->sched.timer, ath_chanctx_timer,
1184 (unsigned long)sc);
1185 }
1186
1187 void ath9k_deinit_channel_context(struct ath_softc *sc)
1188 {
1189 cancel_work_sync(&sc->chanctx_work);
1190 }
1191
1192 bool ath9k_is_chanctx_enabled(void)
1193 {
1194 return (ath9k_use_chanctx == 1);
1195 }
1196
1197 /********************/
1198 /* Queue management */
1199 /********************/
1200
1201 void ath9k_chanctx_stop_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1202 {
1203 struct ath_hw *ah = sc->sc_ah;
1204 int i;
1205
1206 if (ctx == &sc->offchannel.chan) {
1207 ieee80211_stop_queue(sc->hw,
1208 sc->hw->offchannel_tx_hw_queue);
1209 } else {
1210 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1211 ieee80211_stop_queue(sc->hw,
1212 ctx->hw_queue_base + i);
1213 }
1214
1215 if (ah->opmode == NL80211_IFTYPE_AP)
1216 ieee80211_stop_queue(sc->hw, sc->hw->queues - 2);
1217 }
1218
1219
1220 void ath9k_chanctx_wake_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1221 {
1222 struct ath_hw *ah = sc->sc_ah;
1223 int i;
1224
1225 if (ctx == &sc->offchannel.chan) {
1226 ieee80211_wake_queue(sc->hw,
1227 sc->hw->offchannel_tx_hw_queue);
1228 } else {
1229 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1230 ieee80211_wake_queue(sc->hw,
1231 ctx->hw_queue_base + i);
1232 }
1233
1234 if (ah->opmode == NL80211_IFTYPE_AP)
1235 ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
1236 }
1237
1238 /*****************/
1239 /* P2P Powersave */
1240 /*****************/
1241
1242 static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
1243 {
1244 struct ath_hw *ah = sc->sc_ah;
1245 s32 tsf, target_tsf;
1246
1247 if (!avp || !avp->noa.has_next_tsf)
1248 return;
1249
1250 ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
1251
1252 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1253
1254 target_tsf = avp->noa.next_tsf;
1255 if (!avp->noa.absent)
1256 target_tsf -= ATH_P2P_PS_STOP_TIME;
1257
1258 if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
1259 target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
1260
1261 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, (u32) target_tsf, 1000000);
1262 }
1263
1264 static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
1265 {
1266 struct ath_vif *avp = (void *)vif->drv_priv;
1267 u32 tsf;
1268
1269 if (!sc->p2p_ps_timer)
1270 return;
1271
1272 if (vif->type != NL80211_IFTYPE_STATION || !vif->p2p)
1273 return;
1274
1275 sc->p2p_ps_vif = avp;
1276 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1277 ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
1278 ath9k_update_p2p_ps_timer(sc, avp);
1279 }
1280
1281 static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
1282 {
1283 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
1284 u8 switch_time, ctwin;
1285
1286 /*
1287 * Channel switch in multi-channel mode is deferred
1288 * by a quarter beacon interval when handling
1289 * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
1290 * interface is guaranteed to be discoverable
1291 * for that duration after a TBTT.
1292 */
1293 switch_time = cur_conf->beacon_interval / 4;
1294
1295 ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
1296 if (ctwin && (ctwin < switch_time))
1297 return ctwin;
1298
1299 if (switch_time < P2P_DEFAULT_CTWIN)
1300 return 0;
1301
1302 return P2P_DEFAULT_CTWIN;
1303 }
1304
1305 void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
1306 struct sk_buff *skb)
1307 {
1308 static const u8 noa_ie_hdr[] = {
1309 WLAN_EID_VENDOR_SPECIFIC, /* type */
1310 0, /* length */
1311 0x50, 0x6f, 0x9a, /* WFA OUI */
1312 0x09, /* P2P subtype */
1313 0x0c, /* Notice of Absence */
1314 0x00, /* LSB of little-endian len */
1315 0x00, /* MSB of little-endian len */
1316 };
1317
1318 struct ieee80211_p2p_noa_attr *noa;
1319 int noa_len, noa_desc, i = 0;
1320 u8 *hdr;
1321
1322 if (!avp->offchannel_duration && !avp->noa_duration)
1323 return;
1324
1325 noa_desc = !!avp->offchannel_duration + !!avp->noa_duration;
1326 noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
1327
1328 hdr = skb_put(skb, sizeof(noa_ie_hdr));
1329 memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
1330 hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
1331 hdr[7] = noa_len;
1332
1333 noa = (void *) skb_put(skb, noa_len);
1334 memset(noa, 0, noa_len);
1335
1336 noa->index = avp->noa_index;
1337 noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
1338
1339 if (avp->noa_duration) {
1340 if (avp->periodic_noa) {
1341 u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
1342 noa->desc[i].count = 255;
1343 noa->desc[i].interval = cpu_to_le32(interval);
1344 } else {
1345 noa->desc[i].count = 1;
1346 }
1347
1348 noa->desc[i].start_time = cpu_to_le32(avp->noa_start);
1349 noa->desc[i].duration = cpu_to_le32(avp->noa_duration);
1350 i++;
1351 }
1352
1353 if (avp->offchannel_duration) {
1354 noa->desc[i].count = 1;
1355 noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
1356 noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
1357 }
1358 }
1359
1360 void ath9k_p2p_ps_timer(void *priv)
1361 {
1362 struct ath_softc *sc = priv;
1363 struct ath_vif *avp = sc->p2p_ps_vif;
1364 struct ieee80211_vif *vif;
1365 struct ieee80211_sta *sta;
1366 struct ath_node *an;
1367 u32 tsf;
1368
1369 del_timer_sync(&sc->sched.timer);
1370 ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
1371 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1372
1373 if (!avp || avp->chanctx != sc->cur_chan)
1374 return;
1375
1376 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1377 if (!avp->noa.absent)
1378 tsf += ATH_P2P_PS_STOP_TIME;
1379
1380 if (!avp->noa.has_next_tsf ||
1381 avp->noa.next_tsf - tsf > BIT(31))
1382 ieee80211_update_p2p_noa(&avp->noa, tsf);
1383
1384 ath9k_update_p2p_ps_timer(sc, avp);
1385
1386 rcu_read_lock();
1387
1388 vif = avp->vif;
1389 sta = ieee80211_find_sta(vif, avp->bssid);
1390 if (!sta)
1391 goto out;
1392
1393 an = (void *) sta->drv_priv;
1394 if (an->sleeping == !!avp->noa.absent)
1395 goto out;
1396
1397 an->sleeping = avp->noa.absent;
1398 if (an->sleeping)
1399 ath_tx_aggr_sleep(sta, sc, an);
1400 else
1401 ath_tx_aggr_wakeup(sc, an);
1402
1403 out:
1404 rcu_read_unlock();
1405 }
1406
1407 void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
1408 struct ieee80211_vif *vif)
1409 {
1410 unsigned long flags;
1411
1412 spin_lock_bh(&sc->sc_pcu_lock);
1413 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1414 if (!(sc->ps_flags & PS_BEACON_SYNC))
1415 ath9k_update_p2p_ps(sc, vif);
1416 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1417 spin_unlock_bh(&sc->sc_pcu_lock);
1418 }
1419
1420 void ath9k_p2p_beacon_sync(struct ath_softc *sc)
1421 {
1422 if (sc->p2p_ps_vif)
1423 ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
1424 }
1425
1426 void ath9k_p2p_remove_vif(struct ath_softc *sc,
1427 struct ieee80211_vif *vif)
1428 {
1429 struct ath_vif *avp = (void *)vif->drv_priv;
1430
1431 spin_lock_bh(&sc->sc_pcu_lock);
1432 if (avp == sc->p2p_ps_vif) {
1433 sc->p2p_ps_vif = NULL;
1434 ath9k_update_p2p_ps_timer(sc, NULL);
1435 }
1436 spin_unlock_bh(&sc->sc_pcu_lock);
1437 }
1438
1439 int ath9k_init_p2p(struct ath_softc *sc)
1440 {
1441 sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
1442 NULL, sc, AR_FIRST_NDP_TIMER);
1443 if (!sc->p2p_ps_timer)
1444 return -ENOMEM;
1445
1446 return 0;
1447 }
1448
1449 void ath9k_deinit_p2p(struct ath_softc *sc)
1450 {
1451 if (sc->p2p_ps_timer)
1452 ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
1453 }
1454
1455 #endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */
Linux kernel - Deliverables
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