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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[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_ASSOC);
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 ath_chanctx_adjust_tbtt_delta(sc);
499 sc->sched.beacon_pending = false;
500 sc->sched.beacon_miss = 0;
501
502 /* TSF time might have been updated by the incoming beacon,
503 * need update the channel switch timer to reflect the change.
504 */
505 tsf_time = sc->sched.switch_start_time;
506 tsf_time -= (u32) sc->cur_chan->tsf_val +
507 ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
508 tsf_time += ath9k_hw_gettsf32(ah);
509
510
511 ath_chanctx_setup_timer(sc, tsf_time);
512 break;
513 case ATH_CHANCTX_EVENT_ASSOC:
514 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
515 avp->chanctx != sc->cur_chan)
516 break;
517
518 ath_dbg(common, CHAN_CTX,
519 "Move chanctx state from FORCE_ACTIVE to IDLE\n");
520
521 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
522 /* fall through */
523 case ATH_CHANCTX_EVENT_SWITCH:
524 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
525 sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
526 sc->cur_chan->switch_after_beacon ||
527 sc->cur_chan == &sc->offchannel.chan)
528 break;
529
530 /* If this is a station chanctx, stay active for a half
531 * beacon period (minus channel switch time)
532 */
533 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
534 cur_conf = &sc->cur_chan->beacon;
535
536 ath_dbg(common, CHAN_CTX,
537 "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
538
539 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
540 sc->sched.wait_switch = false;
541
542 tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
543
544 if (sc->sched.extend_absence) {
545 sc->sched.beacon_miss = 0;
546 tsf_time *= 3;
547 }
548
549 tsf_time -= sc->sched.channel_switch_time;
550 tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
551 sc->sched.switch_start_time = tsf_time;
552
553 ath_chanctx_setup_timer(sc, tsf_time);
554 sc->sched.beacon_pending = true;
555 break;
556 case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
557 if (sc->cur_chan == &sc->offchannel.chan ||
558 sc->cur_chan->switch_after_beacon)
559 break;
560
561 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
562 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
563 break;
564 case ATH_CHANCTX_EVENT_UNASSIGN:
565 if (sc->cur_chan->assigned) {
566 if (sc->next_chan && !sc->next_chan->assigned &&
567 sc->next_chan != &sc->offchannel.chan)
568 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
569 break;
570 }
571
572 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
573 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
574 if (!ctx->assigned)
575 break;
576
577 sc->next_chan = ctx;
578 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
579 break;
580 case ATH_CHANCTX_EVENT_ASSIGN:
581 /*
582 * When adding a new channel context, check if a scan
583 * is in progress and abort it since the addition of
584 * a new channel context is usually followed by VIF
585 * assignment, in which case we have to start multi-channel
586 * operation.
587 */
588 if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
589 ath_dbg(common, CHAN_CTX,
590 "Aborting HW scan to add new context\n");
591
592 spin_unlock_bh(&sc->chan_lock);
593 del_timer_sync(&sc->offchannel.timer);
594 ath_scan_complete(sc, true);
595 spin_lock_bh(&sc->chan_lock);
596 }
597 break;
598 case ATH_CHANCTX_EVENT_CHANGE:
599 break;
600 }
601
602 spin_unlock_bh(&sc->chan_lock);
603 }
604
605 void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
606 enum ath_chanctx_event ev)
607 {
608 if (sc->sched.beacon_pending)
609 ath_chanctx_event(sc, NULL, ev);
610 }
611
612 void ath_chanctx_beacon_recv_ev(struct ath_softc *sc,
613 enum ath_chanctx_event ev)
614 {
615 ath_chanctx_event(sc, NULL, ev);
616 }
617
618 static int ath_scan_channel_duration(struct ath_softc *sc,
619 struct ieee80211_channel *chan)
620 {
621 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
622
623 if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
624 return (HZ / 9); /* ~110 ms */
625
626 return (HZ / 16); /* ~60 ms */
627 }
628
629 static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
630 struct cfg80211_chan_def *chandef)
631 {
632 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
633
634 spin_lock_bh(&sc->chan_lock);
635
636 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
637 (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
638 if (chandef)
639 ctx->chandef = *chandef;
640
641 sc->sched.offchannel_pending = true;
642 sc->sched.wait_switch = true;
643 sc->sched.offchannel_duration =
644 jiffies_to_usecs(sc->offchannel.duration) +
645 sc->sched.channel_switch_time;
646
647 spin_unlock_bh(&sc->chan_lock);
648 ath_dbg(common, CHAN_CTX,
649 "Set offchannel_pending to true\n");
650 return;
651 }
652
653 sc->next_chan = ctx;
654 if (chandef) {
655 ctx->chandef = *chandef;
656 ath_dbg(common, CHAN_CTX,
657 "Assigned next_chan to %d MHz\n", chandef->center_freq1);
658 }
659
660 if (sc->next_chan == &sc->offchannel.chan) {
661 sc->sched.offchannel_duration =
662 jiffies_to_usecs(sc->offchannel.duration) +
663 sc->sched.channel_switch_time;
664
665 if (chandef) {
666 ath_dbg(common, CHAN_CTX,
667 "Offchannel duration for chan %d MHz : %u\n",
668 chandef->center_freq1,
669 sc->sched.offchannel_duration);
670 }
671 }
672 spin_unlock_bh(&sc->chan_lock);
673 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
674 }
675
676 static void ath_chanctx_offchan_switch(struct ath_softc *sc,
677 struct ieee80211_channel *chan)
678 {
679 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
680 struct cfg80211_chan_def chandef;
681
682 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
683 ath_dbg(common, CHAN_CTX,
684 "Channel definition created: %d MHz\n", chandef.center_freq1);
685
686 ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
687 }
688
689 static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
690 bool active)
691 {
692 struct ath_chanctx *ctx;
693
694 ath_for_each_chanctx(sc, ctx) {
695 if (!ctx->assigned || list_empty(&ctx->vifs))
696 continue;
697 if (active && !ctx->active)
698 continue;
699
700 if (ctx->switch_after_beacon)
701 return ctx;
702 }
703
704 return &sc->chanctx[0];
705 }
706
707 static void
708 ath_scan_next_channel(struct ath_softc *sc)
709 {
710 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
711 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
712 struct ieee80211_channel *chan;
713
714 if (sc->offchannel.scan_idx >= req->n_channels) {
715 ath_dbg(common, CHAN_CTX,
716 "Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
717 "scan_idx: %d, n_channels: %d\n",
718 sc->offchannel.scan_idx,
719 req->n_channels);
720
721 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
722 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
723 NULL);
724 return;
725 }
726
727 ath_dbg(common, CHAN_CTX,
728 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
729 sc->offchannel.scan_idx);
730
731 chan = req->channels[sc->offchannel.scan_idx++];
732 sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
733 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
734
735 ath_chanctx_offchan_switch(sc, chan);
736 }
737
738 void ath_offchannel_next(struct ath_softc *sc)
739 {
740 struct ieee80211_vif *vif;
741
742 if (sc->offchannel.scan_req) {
743 vif = sc->offchannel.scan_vif;
744 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
745 ath_scan_next_channel(sc);
746 } else if (sc->offchannel.roc_vif) {
747 vif = sc->offchannel.roc_vif;
748 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
749 sc->offchannel.duration =
750 msecs_to_jiffies(sc->offchannel.roc_duration);
751 sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
752 ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
753 } else {
754 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
755 NULL);
756 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
757 if (sc->ps_idle)
758 ath_cancel_work(sc);
759 }
760 }
761
762 void ath_roc_complete(struct ath_softc *sc, bool abort)
763 {
764 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
765
766 if (abort)
767 ath_dbg(common, CHAN_CTX, "RoC aborted\n");
768 else
769 ath_dbg(common, CHAN_CTX, "RoC expired\n");
770
771 sc->offchannel.roc_vif = NULL;
772 sc->offchannel.roc_chan = NULL;
773 if (!abort)
774 ieee80211_remain_on_channel_expired(sc->hw);
775 ath_offchannel_next(sc);
776 ath9k_ps_restore(sc);
777 }
778
779 void ath_scan_complete(struct ath_softc *sc, bool abort)
780 {
781 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
782
783 if (abort)
784 ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
785 else
786 ath_dbg(common, CHAN_CTX, "HW scan complete\n");
787
788 sc->offchannel.scan_req = NULL;
789 sc->offchannel.scan_vif = NULL;
790 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
791 ieee80211_scan_completed(sc->hw, abort);
792 clear_bit(ATH_OP_SCANNING, &common->op_flags);
793 spin_lock_bh(&sc->chan_lock);
794 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
795 sc->sched.force_noa_update = true;
796 spin_unlock_bh(&sc->chan_lock);
797 ath_offchannel_next(sc);
798 ath9k_ps_restore(sc);
799 }
800
801 static void ath_scan_send_probe(struct ath_softc *sc,
802 struct cfg80211_ssid *ssid)
803 {
804 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
805 struct ieee80211_vif *vif = sc->offchannel.scan_vif;
806 struct ath_tx_control txctl = {};
807 struct sk_buff *skb;
808 struct ieee80211_tx_info *info;
809 int band = sc->offchannel.chan.chandef.chan->band;
810
811 skb = ieee80211_probereq_get(sc->hw, vif,
812 ssid->ssid, ssid->ssid_len, req->ie_len);
813 if (!skb)
814 return;
815
816 info = IEEE80211_SKB_CB(skb);
817 if (req->no_cck)
818 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
819
820 if (req->ie_len)
821 memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
822
823 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
824
825 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
826 goto error;
827
828 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
829 txctl.force_channel = true;
830 if (ath_tx_start(sc->hw, skb, &txctl))
831 goto error;
832
833 return;
834
835 error:
836 ieee80211_free_txskb(sc->hw, skb);
837 }
838
839 static void ath_scan_channel_start(struct ath_softc *sc)
840 {
841 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
842 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
843 int i;
844
845 if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
846 req->n_ssids) {
847 for (i = 0; i < req->n_ssids; i++)
848 ath_scan_send_probe(sc, &req->ssids[i]);
849
850 }
851
852 ath_dbg(common, CHAN_CTX,
853 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
854
855 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
856 mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
857 }
858
859 static void ath_chanctx_timer(unsigned long data)
860 {
861 struct ath_softc *sc = (struct ath_softc *) data;
862 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
863
864 ath_dbg(common, CHAN_CTX,
865 "Channel context timer invoked\n");
866
867 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
868 }
869
870 static void ath_offchannel_timer(unsigned long data)
871 {
872 struct ath_softc *sc = (struct ath_softc *)data;
873 struct ath_chanctx *ctx;
874 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
875
876 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
877 __func__, offchannel_state_string(sc->offchannel.state));
878
879 switch (sc->offchannel.state) {
880 case ATH_OFFCHANNEL_PROBE_WAIT:
881 if (!sc->offchannel.scan_req)
882 return;
883
884 /* get first active channel context */
885 ctx = ath_chanctx_get_oper_chan(sc, true);
886 if (ctx->active) {
887 ath_dbg(common, CHAN_CTX,
888 "Switch to oper/active context, "
889 "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
890
891 sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
892 ath_chanctx_switch(sc, ctx, NULL);
893 mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
894 break;
895 }
896 /* fall through */
897 case ATH_OFFCHANNEL_SUSPEND:
898 if (!sc->offchannel.scan_req)
899 return;
900
901 ath_scan_next_channel(sc);
902 break;
903 case ATH_OFFCHANNEL_ROC_START:
904 case ATH_OFFCHANNEL_ROC_WAIT:
905 ctx = ath_chanctx_get_oper_chan(sc, false);
906 sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
907 ath_chanctx_switch(sc, ctx, NULL);
908 break;
909 default:
910 break;
911 }
912 }
913
914 static bool
915 ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
916 bool powersave)
917 {
918 struct ieee80211_vif *vif = avp->vif;
919 struct ieee80211_sta *sta = NULL;
920 struct ieee80211_hdr_3addr *nullfunc;
921 struct ath_tx_control txctl;
922 struct sk_buff *skb;
923 int band = sc->cur_chan->chandef.chan->band;
924
925 switch (vif->type) {
926 case NL80211_IFTYPE_STATION:
927 if (!avp->assoc)
928 return false;
929
930 skb = ieee80211_nullfunc_get(sc->hw, vif);
931 if (!skb)
932 return false;
933
934 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
935 if (powersave)
936 nullfunc->frame_control |=
937 cpu_to_le16(IEEE80211_FCTL_PM);
938
939 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
940 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
941 dev_kfree_skb_any(skb);
942 return false;
943 }
944 break;
945 default:
946 return false;
947 }
948
949 memset(&txctl, 0, sizeof(txctl));
950 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
951 txctl.sta = sta;
952 txctl.force_channel = true;
953 if (ath_tx_start(sc->hw, skb, &txctl)) {
954 ieee80211_free_txskb(sc->hw, skb);
955 return false;
956 }
957
958 return true;
959 }
960
961 static bool
962 ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
963 {
964 struct ath_vif *avp;
965 bool sent = false;
966
967 rcu_read_lock();
968 list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
969 if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
970 sent = true;
971 }
972 rcu_read_unlock();
973
974 return sent;
975 }
976
977 static bool ath_chanctx_defer_switch(struct ath_softc *sc)
978 {
979 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
980
981 if (sc->cur_chan == &sc->offchannel.chan)
982 return false;
983
984 switch (sc->sched.state) {
985 case ATH_CHANCTX_STATE_SWITCH:
986 return false;
987 case ATH_CHANCTX_STATE_IDLE:
988 if (!sc->cur_chan->switch_after_beacon)
989 return false;
990
991 ath_dbg(common, CHAN_CTX,
992 "Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
993
994 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
995 break;
996 default:
997 break;
998 }
999
1000 return true;
1001 }
1002
1003 static void ath_offchannel_channel_change(struct ath_softc *sc)
1004 {
1005 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1006
1007 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
1008 __func__, offchannel_state_string(sc->offchannel.state));
1009
1010 switch (sc->offchannel.state) {
1011 case ATH_OFFCHANNEL_PROBE_SEND:
1012 if (!sc->offchannel.scan_req)
1013 return;
1014
1015 if (sc->cur_chan->chandef.chan !=
1016 sc->offchannel.chan.chandef.chan)
1017 return;
1018
1019 ath_scan_channel_start(sc);
1020 break;
1021 case ATH_OFFCHANNEL_IDLE:
1022 if (!sc->offchannel.scan_req)
1023 return;
1024
1025 ath_scan_complete(sc, false);
1026 break;
1027 case ATH_OFFCHANNEL_ROC_START:
1028 if (sc->cur_chan != &sc->offchannel.chan)
1029 break;
1030
1031 sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
1032 mod_timer(&sc->offchannel.timer,
1033 jiffies + sc->offchannel.duration);
1034 ieee80211_ready_on_channel(sc->hw);
1035 break;
1036 case ATH_OFFCHANNEL_ROC_DONE:
1037 ath_roc_complete(sc, false);
1038 break;
1039 default:
1040 break;
1041 }
1042 }
1043
1044 void ath_chanctx_set_next(struct ath_softc *sc, bool force)
1045 {
1046 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1047 struct ath_chanctx *old_ctx;
1048 struct timespec ts;
1049 bool measure_time = false;
1050 bool send_ps = false;
1051 bool queues_stopped = false;
1052
1053 spin_lock_bh(&sc->chan_lock);
1054 if (!sc->next_chan) {
1055 spin_unlock_bh(&sc->chan_lock);
1056 return;
1057 }
1058
1059 if (!force && ath_chanctx_defer_switch(sc)) {
1060 spin_unlock_bh(&sc->chan_lock);
1061 return;
1062 }
1063
1064 ath_dbg(common, CHAN_CTX,
1065 "%s: current: %d MHz, next: %d MHz\n",
1066 __func__,
1067 sc->cur_chan->chandef.center_freq1,
1068 sc->next_chan->chandef.center_freq1);
1069
1070 if (sc->cur_chan != sc->next_chan) {
1071 ath_dbg(common, CHAN_CTX,
1072 "Stopping current chanctx: %d\n",
1073 sc->cur_chan->chandef.center_freq1);
1074 sc->cur_chan->stopped = true;
1075 spin_unlock_bh(&sc->chan_lock);
1076
1077 if (sc->next_chan == &sc->offchannel.chan) {
1078 getrawmonotonic(&ts);
1079 measure_time = true;
1080 }
1081
1082 ath9k_chanctx_stop_queues(sc, sc->cur_chan);
1083 queues_stopped = true;
1084
1085 __ath9k_flush(sc->hw, ~0, true);
1086
1087 if (ath_chanctx_send_ps_frame(sc, true))
1088 __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false);
1089
1090 send_ps = true;
1091 spin_lock_bh(&sc->chan_lock);
1092
1093 if (sc->cur_chan != &sc->offchannel.chan) {
1094 getrawmonotonic(&sc->cur_chan->tsf_ts);
1095 sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
1096 }
1097 }
1098 old_ctx = sc->cur_chan;
1099 sc->cur_chan = sc->next_chan;
1100 sc->cur_chan->stopped = false;
1101 sc->next_chan = NULL;
1102
1103 if (!sc->sched.offchannel_pending)
1104 sc->sched.offchannel_duration = 0;
1105
1106 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
1107 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
1108
1109 spin_unlock_bh(&sc->chan_lock);
1110
1111 if (sc->sc_ah->chip_fullsleep ||
1112 memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
1113 sizeof(sc->cur_chandef))) {
1114 ath_dbg(common, CHAN_CTX,
1115 "%s: Set channel %d MHz\n",
1116 __func__, sc->cur_chan->chandef.center_freq1);
1117 ath_set_channel(sc);
1118 if (measure_time)
1119 sc->sched.channel_switch_time =
1120 ath9k_hw_get_tsf_offset(&ts, NULL);
1121 /*
1122 * A reset will ensure that all queues are woken up,
1123 * so there is no need to awaken them again.
1124 */
1125 goto out;
1126 }
1127
1128 if (queues_stopped)
1129 ath9k_chanctx_wake_queues(sc, old_ctx);
1130 out:
1131 if (send_ps)
1132 ath_chanctx_send_ps_frame(sc, false);
1133
1134 ath_offchannel_channel_change(sc);
1135 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
1136 }
1137
1138 static void ath_chanctx_work(struct work_struct *work)
1139 {
1140 struct ath_softc *sc = container_of(work, struct ath_softc,
1141 chanctx_work);
1142 mutex_lock(&sc->mutex);
1143 ath_chanctx_set_next(sc, false);
1144 mutex_unlock(&sc->mutex);
1145 }
1146
1147 void ath9k_offchannel_init(struct ath_softc *sc)
1148 {
1149 struct ath_chanctx *ctx;
1150 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1151 struct ieee80211_supported_band *sband;
1152 struct ieee80211_channel *chan;
1153 int i;
1154
1155 sband = &common->sbands[IEEE80211_BAND_2GHZ];
1156 if (!sband->n_channels)
1157 sband = &common->sbands[IEEE80211_BAND_5GHZ];
1158
1159 chan = &sband->channels[0];
1160
1161 ctx = &sc->offchannel.chan;
1162 INIT_LIST_HEAD(&ctx->vifs);
1163 ctx->txpower = ATH_TXPOWER_MAX;
1164 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
1165
1166 for (i = 0; i < ARRAY_SIZE(ctx->acq); i++)
1167 INIT_LIST_HEAD(&ctx->acq[i]);
1168
1169 sc->offchannel.chan.offchannel = true;
1170 }
1171
1172 void ath9k_init_channel_context(struct ath_softc *sc)
1173 {
1174 INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
1175
1176 setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
1177 (unsigned long)sc);
1178 setup_timer(&sc->sched.timer, ath_chanctx_timer,
1179 (unsigned long)sc);
1180 }
1181
1182 void ath9k_deinit_channel_context(struct ath_softc *sc)
1183 {
1184 cancel_work_sync(&sc->chanctx_work);
1185 }
1186
1187 bool ath9k_is_chanctx_enabled(void)
1188 {
1189 return (ath9k_use_chanctx == 1);
1190 }
1191
1192 /********************/
1193 /* Queue management */
1194 /********************/
1195
1196 void ath9k_chanctx_stop_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1197 {
1198 struct ath_hw *ah = sc->sc_ah;
1199 int i;
1200
1201 if (ctx == &sc->offchannel.chan) {
1202 ieee80211_stop_queue(sc->hw,
1203 sc->hw->offchannel_tx_hw_queue);
1204 } else {
1205 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1206 ieee80211_stop_queue(sc->hw,
1207 ctx->hw_queue_base + i);
1208 }
1209
1210 if (ah->opmode == NL80211_IFTYPE_AP)
1211 ieee80211_stop_queue(sc->hw, sc->hw->queues - 2);
1212 }
1213
1214
1215 void ath9k_chanctx_wake_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1216 {
1217 struct ath_hw *ah = sc->sc_ah;
1218 int i;
1219
1220 if (ctx == &sc->offchannel.chan) {
1221 ieee80211_wake_queue(sc->hw,
1222 sc->hw->offchannel_tx_hw_queue);
1223 } else {
1224 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1225 ieee80211_wake_queue(sc->hw,
1226 ctx->hw_queue_base + i);
1227 }
1228
1229 if (ah->opmode == NL80211_IFTYPE_AP)
1230 ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
1231 }
1232
1233 /*****************/
1234 /* P2P Powersave */
1235 /*****************/
1236
1237 static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
1238 {
1239 struct ath_hw *ah = sc->sc_ah;
1240 s32 tsf, target_tsf;
1241
1242 if (!avp || !avp->noa.has_next_tsf)
1243 return;
1244
1245 ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
1246
1247 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1248
1249 target_tsf = avp->noa.next_tsf;
1250 if (!avp->noa.absent)
1251 target_tsf -= ATH_P2P_PS_STOP_TIME;
1252
1253 if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
1254 target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
1255
1256 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, (u32) target_tsf, 1000000);
1257 }
1258
1259 static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
1260 {
1261 struct ath_vif *avp = (void *)vif->drv_priv;
1262 u32 tsf;
1263
1264 if (!sc->p2p_ps_timer)
1265 return;
1266
1267 if (vif->type != NL80211_IFTYPE_STATION || !vif->p2p)
1268 return;
1269
1270 sc->p2p_ps_vif = avp;
1271 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1272 ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
1273 ath9k_update_p2p_ps_timer(sc, avp);
1274 }
1275
1276 static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
1277 {
1278 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
1279 u8 switch_time, ctwin;
1280
1281 /*
1282 * Channel switch in multi-channel mode is deferred
1283 * by a quarter beacon interval when handling
1284 * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
1285 * interface is guaranteed to be discoverable
1286 * for that duration after a TBTT.
1287 */
1288 switch_time = cur_conf->beacon_interval / 4;
1289
1290 ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
1291 if (ctwin && (ctwin < switch_time))
1292 return ctwin;
1293
1294 if (switch_time < P2P_DEFAULT_CTWIN)
1295 return 0;
1296
1297 return P2P_DEFAULT_CTWIN;
1298 }
1299
1300 void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
1301 struct sk_buff *skb)
1302 {
1303 static const u8 noa_ie_hdr[] = {
1304 WLAN_EID_VENDOR_SPECIFIC, /* type */
1305 0, /* length */
1306 0x50, 0x6f, 0x9a, /* WFA OUI */
1307 0x09, /* P2P subtype */
1308 0x0c, /* Notice of Absence */
1309 0x00, /* LSB of little-endian len */
1310 0x00, /* MSB of little-endian len */
1311 };
1312
1313 struct ieee80211_p2p_noa_attr *noa;
1314 int noa_len, noa_desc, i = 0;
1315 u8 *hdr;
1316
1317 if (!avp->offchannel_duration && !avp->noa_duration)
1318 return;
1319
1320 noa_desc = !!avp->offchannel_duration + !!avp->noa_duration;
1321 noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
1322
1323 hdr = skb_put(skb, sizeof(noa_ie_hdr));
1324 memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
1325 hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
1326 hdr[7] = noa_len;
1327
1328 noa = (void *) skb_put(skb, noa_len);
1329 memset(noa, 0, noa_len);
1330
1331 noa->index = avp->noa_index;
1332 noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
1333
1334 if (avp->noa_duration) {
1335 if (avp->periodic_noa) {
1336 u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
1337 noa->desc[i].count = 255;
1338 noa->desc[i].interval = cpu_to_le32(interval);
1339 } else {
1340 noa->desc[i].count = 1;
1341 }
1342
1343 noa->desc[i].start_time = cpu_to_le32(avp->noa_start);
1344 noa->desc[i].duration = cpu_to_le32(avp->noa_duration);
1345 i++;
1346 }
1347
1348 if (avp->offchannel_duration) {
1349 noa->desc[i].count = 1;
1350 noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
1351 noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
1352 }
1353 }
1354
1355 void ath9k_p2p_ps_timer(void *priv)
1356 {
1357 struct ath_softc *sc = priv;
1358 struct ath_vif *avp = sc->p2p_ps_vif;
1359 struct ieee80211_vif *vif;
1360 struct ieee80211_sta *sta;
1361 struct ath_node *an;
1362 u32 tsf;
1363
1364 del_timer_sync(&sc->sched.timer);
1365 ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
1366 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1367
1368 if (!avp || avp->chanctx != sc->cur_chan)
1369 return;
1370
1371 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1372 if (!avp->noa.absent)
1373 tsf += ATH_P2P_PS_STOP_TIME;
1374
1375 if (!avp->noa.has_next_tsf ||
1376 avp->noa.next_tsf - tsf > BIT(31))
1377 ieee80211_update_p2p_noa(&avp->noa, tsf);
1378
1379 ath9k_update_p2p_ps_timer(sc, avp);
1380
1381 rcu_read_lock();
1382
1383 vif = avp->vif;
1384 sta = ieee80211_find_sta(vif, avp->bssid);
1385 if (!sta)
1386 goto out;
1387
1388 an = (void *) sta->drv_priv;
1389 if (an->sleeping == !!avp->noa.absent)
1390 goto out;
1391
1392 an->sleeping = avp->noa.absent;
1393 if (an->sleeping)
1394 ath_tx_aggr_sleep(sta, sc, an);
1395 else
1396 ath_tx_aggr_wakeup(sc, an);
1397
1398 out:
1399 rcu_read_unlock();
1400 }
1401
1402 void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
1403 struct ieee80211_vif *vif)
1404 {
1405 unsigned long flags;
1406
1407 spin_lock_bh(&sc->sc_pcu_lock);
1408 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1409 if (!(sc->ps_flags & PS_BEACON_SYNC))
1410 ath9k_update_p2p_ps(sc, vif);
1411 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1412 spin_unlock_bh(&sc->sc_pcu_lock);
1413 }
1414
1415 void ath9k_p2p_beacon_sync(struct ath_softc *sc)
1416 {
1417 if (sc->p2p_ps_vif)
1418 ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
1419 }
1420
1421 void ath9k_p2p_remove_vif(struct ath_softc *sc,
1422 struct ieee80211_vif *vif)
1423 {
1424 struct ath_vif *avp = (void *)vif->drv_priv;
1425
1426 spin_lock_bh(&sc->sc_pcu_lock);
1427 if (avp == sc->p2p_ps_vif) {
1428 sc->p2p_ps_vif = NULL;
1429 ath9k_update_p2p_ps_timer(sc, NULL);
1430 }
1431 spin_unlock_bh(&sc->sc_pcu_lock);
1432 }
1433
1434 int ath9k_init_p2p(struct ath_softc *sc)
1435 {
1436 sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
1437 NULL, sc, AR_FIRST_NDP_TIMER);
1438 if (!sc->p2p_ps_timer)
1439 return -ENOMEM;
1440
1441 return 0;
1442 }
1443
1444 void ath9k_deinit_p2p(struct ath_softc *sc)
1445 {
1446 if (sc->p2p_ps_timer)
1447 ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
1448 }
1449
1450 #endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */
Linux kernel - Deliverables
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