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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 */
23static 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(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->spec_priv.spectral_mode == SPECTRAL_CHANSCAN)
96 ath9k_cmn_spectral_scan_trigger(common, &sc->spec_priv);
97 }
98
99 return 0;
100}
101
102void 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 ctx->flush_timeout = HZ / 5; /* 200ms */
121 for (j = 0; j < ARRAY_SIZE(ctx->acq); j++)
122 INIT_LIST_HEAD(&ctx->acq[j]);
123 }
124}
125
126void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
127 struct cfg80211_chan_def *chandef)
128{
129 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
130 bool cur_chan;
131
132 spin_lock_bh(&sc->chan_lock);
133 if (chandef)
134 memcpy(&ctx->chandef, chandef, sizeof(*chandef));
135 cur_chan = sc->cur_chan == ctx;
136 spin_unlock_bh(&sc->chan_lock);
137
138 if (!cur_chan) {
139 ath_dbg(common, CHAN_CTX,
140 "Current context differs from the new context\n");
141 return;
142 }
143
144 ath_set_channel(sc);
145}
146
147#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
148
149/*************/
150/* Utilities */
151/*************/
152
153struct ath_chanctx* ath_is_go_chanctx_present(struct ath_softc *sc)
154{
155 struct ath_chanctx *ctx;
156 struct ath_vif *avp;
157 struct ieee80211_vif *vif;
158
159 spin_lock_bh(&sc->chan_lock);
160
161 ath_for_each_chanctx(sc, ctx) {
162 if (!ctx->active)
163 continue;
164
165 list_for_each_entry(avp, &ctx->vifs, list) {
166 vif = avp->vif;
167
168 if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO) {
169 spin_unlock_bh(&sc->chan_lock);
170 return ctx;
171 }
172 }
173 }
174
175 spin_unlock_bh(&sc->chan_lock);
176 return NULL;
177}
178
179/**********************************************************/
180/* Functions to handle the channel context state machine. */
181/**********************************************************/
182
183static const char *offchannel_state_string(enum ath_offchannel_state state)
184{
185 switch (state) {
186 case_rtn_string(ATH_OFFCHANNEL_IDLE);
187 case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
188 case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
189 case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
190 case_rtn_string(ATH_OFFCHANNEL_ROC_START);
191 case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
192 case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
193 default:
194 return "unknown";
195 }
196}
197
198static const char *chanctx_event_string(enum ath_chanctx_event ev)
199{
200 switch (ev) {
201 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
202 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
203 case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
204 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
205 case_rtn_string(ATH_CHANCTX_EVENT_AUTHORIZED);
206 case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
207 case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
208 case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
209 case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
210 case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
211 default:
212 return "unknown";
213 }
214}
215
216static const char *chanctx_state_string(enum ath_chanctx_state state)
217{
218 switch (state) {
219 case_rtn_string(ATH_CHANCTX_STATE_IDLE);
220 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
221 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
222 case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
223 case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
224 default:
225 return "unknown";
226 }
227}
228
229static u32 chanctx_event_delta(struct ath_softc *sc)
230{
231 u64 ms;
232 struct timespec ts, *old;
233
234 getrawmonotonic(&ts);
235 old = &sc->last_event_time;
236 ms = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
237 ms -= old->tv_sec * 1000 + old->tv_nsec / 1000000;
238 sc->last_event_time = ts;
239
240 return (u32)ms;
241}
242
243void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
244{
245 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
246 struct ath_chanctx *ictx;
247 struct ath_vif *avp;
248 bool active = false;
249 u8 n_active = 0;
250
251 if (!ctx)
252 return;
253
254 if (ctx == &sc->offchannel.chan) {
255 spin_lock_bh(&sc->chan_lock);
256
257 if (likely(sc->sched.channel_switch_time))
258 ctx->flush_timeout =
259 usecs_to_jiffies(sc->sched.channel_switch_time);
260 else
261 ctx->flush_timeout =
262 msecs_to_jiffies(10);
263
264 spin_unlock_bh(&sc->chan_lock);
265
266 /*
267 * There is no need to iterate over the
268 * active/assigned channel contexts if
269 * the current context is offchannel.
270 */
271 return;
272 }
273
274 ictx = ctx;
275
276 list_for_each_entry(avp, &ctx->vifs, list) {
277 struct ieee80211_vif *vif = avp->vif;
278
279 switch (vif->type) {
280 case NL80211_IFTYPE_P2P_CLIENT:
281 case NL80211_IFTYPE_STATION:
282 if (avp->assoc)
283 active = true;
284 break;
285 default:
286 active = true;
287 break;
288 }
289 }
290 ctx->active = active;
291
292 ath_for_each_chanctx(sc, ctx) {
293 if (!ctx->assigned || list_empty(&ctx->vifs))
294 continue;
295 n_active++;
296 }
297
298 spin_lock_bh(&sc->chan_lock);
299
300 if (n_active <= 1) {
301 ictx->flush_timeout = HZ / 5;
302 clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
303 spin_unlock_bh(&sc->chan_lock);
304 return;
305 }
306
307 ictx->flush_timeout = usecs_to_jiffies(sc->sched.channel_switch_time);
308
309 if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {
310 spin_unlock_bh(&sc->chan_lock);
311 return;
312 }
313
314 spin_unlock_bh(&sc->chan_lock);
315
316 if (ath9k_is_chanctx_enabled()) {
317 ath_chanctx_event(sc, NULL,
318 ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
319 }
320}
321
322static struct ath_chanctx *
323ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
324{
325 int idx = ctx - &sc->chanctx[0];
326
327 return &sc->chanctx[!idx];
328}
329
330static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
331{
332 struct ath_chanctx *prev, *cur;
333 struct timespec ts;
334 u32 cur_tsf, prev_tsf, beacon_int;
335 s32 offset;
336
337 beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
338
339 cur = sc->cur_chan;
340 prev = ath_chanctx_get_next(sc, cur);
341
342 if (!prev->switch_after_beacon)
343 return;
344
345 getrawmonotonic(&ts);
346 cur_tsf = (u32) cur->tsf_val +
347 ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
348
349 prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
350 prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
351
352 /* Adjust the TSF time of the AP chanctx to keep its beacons
353 * at half beacon interval offset relative to the STA chanctx.
354 */
355 offset = cur_tsf - prev_tsf;
356
357 /* Ignore stale data or spurious timestamps */
358 if (offset < 0 || offset > 3 * beacon_int)
359 return;
360
361 offset = beacon_int / 2 - (offset % beacon_int);
362 prev->tsf_val += offset;
363}
364
365/* Configure the TSF based hardware timer for a channel switch.
366 * Also set up backup software timer, in case the gen timer fails.
367 * This could be caused by a hardware reset.
368 */
369static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time)
370{
371 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
372 struct ath_hw *ah = sc->sc_ah;
373 unsigned long timeout;
374
375 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
376 tsf_time -= ath9k_hw_gettsf32(ah);
377 timeout = msecs_to_jiffies(tsf_time / 1000) + 1;
378 mod_timer(&sc->sched.timer, jiffies + timeout);
379
380 ath_dbg(common, CHAN_CTX,
381 "Setup chanctx timer with timeout: %d (%d) ms\n",
382 tsf_time / 1000, jiffies_to_msecs(timeout));
383}
384
385static void ath_chanctx_handle_bmiss(struct ath_softc *sc,
386 struct ath_chanctx *ctx,
387 struct ath_vif *avp)
388{
389 /*
390 * Clear the extend_absence flag if it had been
391 * set during the previous beacon transmission,
392 * since we need to revert to the normal NoA
393 * schedule.
394 */
395 if (ctx->active && sc->sched.extend_absence) {
396 avp->noa_duration = 0;
397 sc->sched.extend_absence = false;
398 }
399
400 /* If at least two consecutive beacons were missed on the STA
401 * chanctx, stay on the STA channel for one extra beacon period,
402 * to resync the timer properly.
403 */
404 if (ctx->active && sc->sched.beacon_miss >= 2) {
405 avp->noa_duration = 0;
406 sc->sched.extend_absence = true;
407 }
408}
409
410static void ath_chanctx_offchannel_noa(struct ath_softc *sc,
411 struct ath_chanctx *ctx,
412 struct ath_vif *avp,
413 u32 tsf_time)
414{
415 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
416
417 avp->noa_index++;
418 avp->offchannel_start = tsf_time;
419 avp->offchannel_duration = sc->sched.offchannel_duration;
420
421 ath_dbg(common, CHAN_CTX,
422 "offchannel noa_duration: %d, noa_start: %u, noa_index: %d\n",
423 avp->offchannel_duration,
424 avp->offchannel_start,
425 avp->noa_index);
426
427 /*
428 * When multiple contexts are active, the NoA
429 * has to be recalculated and advertised after
430 * an offchannel operation.
431 */
432 if (ctx->active && avp->noa_duration)
433 avp->noa_duration = 0;
434}
435
436static void ath_chanctx_set_periodic_noa(struct ath_softc *sc,
437 struct ath_vif *avp,
438 struct ath_beacon_config *cur_conf,
439 u32 tsf_time,
440 u32 beacon_int)
441{
442 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
443
444 avp->noa_index++;
445 avp->noa_start = tsf_time;
446
447 if (sc->sched.extend_absence)
448 avp->noa_duration = (3 * beacon_int / 2) +
449 sc->sched.channel_switch_time;
450 else
451 avp->noa_duration =
452 TU_TO_USEC(cur_conf->beacon_interval) / 2 +
453 sc->sched.channel_switch_time;
454
455 if (test_bit(ATH_OP_SCANNING, &common->op_flags) ||
456 sc->sched.extend_absence)
457 avp->periodic_noa = false;
458 else
459 avp->periodic_noa = true;
460
461 ath_dbg(common, CHAN_CTX,
462 "noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n",
463 avp->noa_duration,
464 avp->noa_start,
465 avp->noa_index,
466 avp->periodic_noa);
467}
468
469static void ath_chanctx_set_oneshot_noa(struct ath_softc *sc,
470 struct ath_vif *avp,
471 u32 tsf_time,
472 u32 duration)
473{
474 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
475
476 avp->noa_index++;
477 avp->noa_start = tsf_time;
478 avp->periodic_noa = false;
479 avp->oneshot_noa = true;
480 avp->noa_duration = duration + sc->sched.channel_switch_time;
481
482 ath_dbg(common, CHAN_CTX,
483 "oneshot noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n",
484 avp->noa_duration,
485 avp->noa_start,
486 avp->noa_index,
487 avp->periodic_noa);
488}
489
490void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
491 enum ath_chanctx_event ev)
492{
493 struct ath_hw *ah = sc->sc_ah;
494 struct ath_common *common = ath9k_hw_common(ah);
495 struct ath_beacon_config *cur_conf;
496 struct ath_vif *avp = NULL;
497 struct ath_chanctx *ctx;
498 u32 tsf_time;
499 u32 beacon_int;
500
501 if (vif)
502 avp = (struct ath_vif *) vif->drv_priv;
503
504 spin_lock_bh(&sc->chan_lock);
505
506 ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s, delta: %u ms\n",
507 sc->cur_chan->chandef.center_freq1,
508 chanctx_event_string(ev),
509 chanctx_state_string(sc->sched.state),
510 chanctx_event_delta(sc));
511
512 switch (ev) {
513 case ATH_CHANCTX_EVENT_BEACON_PREPARE:
514 if (avp->offchannel_duration)
515 avp->offchannel_duration = 0;
516
517 if (avp->oneshot_noa) {
518 avp->noa_duration = 0;
519 avp->oneshot_noa = false;
520
521 ath_dbg(common, CHAN_CTX,
522 "Clearing oneshot NoA\n");
523 }
524
525 if (avp->chanctx != sc->cur_chan) {
526 ath_dbg(common, CHAN_CTX,
527 "Contexts differ, not preparing beacon\n");
528 break;
529 }
530
531 if (sc->sched.offchannel_pending && !sc->sched.wait_switch) {
532 sc->sched.offchannel_pending = false;
533 sc->next_chan = &sc->offchannel.chan;
534 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
535 ath_dbg(common, CHAN_CTX,
536 "Setting offchannel_pending to false\n");
537 }
538
539 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
540 if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) {
541 sc->next_chan = ctx;
542 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
543 ath_dbg(common, CHAN_CTX,
544 "Set next context, move chanctx state to WAIT_FOR_BEACON\n");
545 }
546
547 /* if the timer missed its window, use the next interval */
548 if (sc->sched.state == ATH_CHANCTX_STATE_WAIT_FOR_TIMER) {
549 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
550 ath_dbg(common, CHAN_CTX,
551 "Move chanctx state from WAIT_FOR_TIMER to WAIT_FOR_BEACON\n");
552 }
553
554 if (sc->sched.mgd_prepare_tx)
555 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
556
557 /*
558 * When a context becomes inactive, for example,
559 * disassociation of a station context, the NoA
560 * attribute needs to be removed from subsequent
561 * beacons.
562 */
563 if (!ctx->active && avp->noa_duration &&
564 sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) {
565 avp->noa_duration = 0;
566 avp->periodic_noa = false;
567
568 ath_dbg(common, CHAN_CTX,
569 "Clearing NoA schedule\n");
570 }
571
572 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
573 break;
574
575 ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr);
576
577 sc->sched.beacon_pending = true;
578 sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER);
579
580 cur_conf = &sc->cur_chan->beacon;
581 beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
582
583 /* defer channel switch by a quarter beacon interval */
584 tsf_time = sc->sched.next_tbtt + beacon_int / 4;
585 sc->sched.switch_start_time = tsf_time;
586 sc->cur_chan->last_beacon = sc->sched.next_tbtt;
587
588 /*
589 * If an offchannel switch is scheduled to happen after
590 * a beacon transmission, update the NoA with one-shot
591 * values and increment the index.
592 */
593 if (sc->next_chan == &sc->offchannel.chan) {
594 ath_chanctx_offchannel_noa(sc, ctx, avp, tsf_time);
595 break;
596 }
597
598 ath_chanctx_handle_bmiss(sc, ctx, avp);
599
600 /*
601 * If a mgd_prepare_tx() has been called by mac80211,
602 * a one-shot NoA needs to be sent. This can happen
603 * with one or more active channel contexts - in both
604 * cases, a new NoA schedule has to be advertised.
605 */
606 if (sc->sched.mgd_prepare_tx) {
607 ath_chanctx_set_oneshot_noa(sc, avp, tsf_time,
608 jiffies_to_usecs(HZ / 5));
609 break;
610 }
611
612 /* Prevent wrap-around issues */
613 if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30))
614 avp->noa_duration = 0;
615
616 /*
617 * If multiple contexts are active, start periodic
618 * NoA and increment the index for the first
619 * announcement.
620 */
621 if (ctx->active &&
622 (!avp->noa_duration || sc->sched.force_noa_update))
623 ath_chanctx_set_periodic_noa(sc, avp, cur_conf,
624 tsf_time, beacon_int);
625
626 if (ctx->active && sc->sched.force_noa_update)
627 sc->sched.force_noa_update = false;
628
629 break;
630 case ATH_CHANCTX_EVENT_BEACON_SENT:
631 if (!sc->sched.beacon_pending) {
632 ath_dbg(common, CHAN_CTX,
633 "No pending beacon\n");
634 break;
635 }
636
637 sc->sched.beacon_pending = false;
638
639 if (sc->sched.mgd_prepare_tx) {
640 sc->sched.mgd_prepare_tx = false;
641 complete(&sc->go_beacon);
642 ath_dbg(common, CHAN_CTX,
643 "Beacon sent, complete go_beacon\n");
644 break;
645 }
646
647 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
648 break;
649
650 ath_dbg(common, CHAN_CTX,
651 "Move chanctx state to WAIT_FOR_TIMER\n");
652
653 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
654 ath_chanctx_setup_timer(sc, sc->sched.switch_start_time);
655 break;
656 case ATH_CHANCTX_EVENT_TSF_TIMER:
657 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER)
658 break;
659
660 if (!sc->cur_chan->switch_after_beacon &&
661 sc->sched.beacon_pending)
662 sc->sched.beacon_miss++;
663
664 ath_dbg(common, CHAN_CTX,
665 "Move chanctx state to SWITCH\n");
666
667 sc->sched.state = ATH_CHANCTX_STATE_SWITCH;
668 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
669 break;
670 case ATH_CHANCTX_EVENT_BEACON_RECEIVED:
671 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
672 sc->cur_chan == &sc->offchannel.chan)
673 break;
674
675 sc->sched.beacon_pending = false;
676 sc->sched.beacon_miss = 0;
677
678 if (sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
679 !sc->sched.beacon_adjust ||
680 !sc->cur_chan->tsf_val)
681 break;
682
683 ath_chanctx_adjust_tbtt_delta(sc);
684
685 /* TSF time might have been updated by the incoming beacon,
686 * need update the channel switch timer to reflect the change.
687 */
688 tsf_time = sc->sched.switch_start_time;
689 tsf_time -= (u32) sc->cur_chan->tsf_val +
690 ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
691 tsf_time += ath9k_hw_gettsf32(ah);
692
693 sc->sched.beacon_adjust = false;
694 ath_chanctx_setup_timer(sc, tsf_time);
695 break;
696 case ATH_CHANCTX_EVENT_AUTHORIZED:
697 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
698 avp->chanctx != sc->cur_chan)
699 break;
700
701 ath_dbg(common, CHAN_CTX,
702 "Move chanctx state from FORCE_ACTIVE to IDLE\n");
703
704 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
705 /* fall through */
706 case ATH_CHANCTX_EVENT_SWITCH:
707 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
708 sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
709 sc->cur_chan->switch_after_beacon ||
710 sc->cur_chan == &sc->offchannel.chan)
711 break;
712
713 /* If this is a station chanctx, stay active for a half
714 * beacon period (minus channel switch time)
715 */
716 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
717 cur_conf = &sc->cur_chan->beacon;
718
719 ath_dbg(common, CHAN_CTX,
720 "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
721
722 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
723 sc->sched.wait_switch = false;
724
725 tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
726
727 if (sc->sched.extend_absence) {
728 sc->sched.beacon_miss = 0;
729 tsf_time *= 3;
730 }
731
732 tsf_time -= sc->sched.channel_switch_time;
733 tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
734 sc->sched.switch_start_time = tsf_time;
735
736 ath_chanctx_setup_timer(sc, tsf_time);
737 sc->sched.beacon_pending = true;
738 sc->sched.beacon_adjust = true;
739 break;
740 case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
741 if (sc->cur_chan == &sc->offchannel.chan ||
742 sc->cur_chan->switch_after_beacon)
743 break;
744
745 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
746 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
747 break;
748 case ATH_CHANCTX_EVENT_UNASSIGN:
749 if (sc->cur_chan->assigned) {
750 if (sc->next_chan && !sc->next_chan->assigned &&
751 sc->next_chan != &sc->offchannel.chan)
752 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
753 break;
754 }
755
756 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
757 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
758 if (!ctx->assigned)
759 break;
760
761 sc->next_chan = ctx;
762 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
763 break;
764 case ATH_CHANCTX_EVENT_ASSIGN:
765 break;
766 case ATH_CHANCTX_EVENT_CHANGE:
767 break;
768 }
769
770 spin_unlock_bh(&sc->chan_lock);
771}
772
773void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
774 enum ath_chanctx_event ev)
775{
776 if (sc->sched.beacon_pending)
777 ath_chanctx_event(sc, NULL, ev);
778}
779
780void ath_chanctx_beacon_recv_ev(struct ath_softc *sc,
781 enum ath_chanctx_event ev)
782{
783 ath_chanctx_event(sc, NULL, ev);
784}
785
786static int ath_scan_channel_duration(struct ath_softc *sc,
787 struct ieee80211_channel *chan)
788{
789 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
790
791 if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
792 return (HZ / 9); /* ~110 ms */
793
794 return (HZ / 16); /* ~60 ms */
795}
796
797static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
798 struct cfg80211_chan_def *chandef)
799{
800 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
801
802 spin_lock_bh(&sc->chan_lock);
803
804 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
805 (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
806 if (chandef)
807 ctx->chandef = *chandef;
808
809 sc->sched.offchannel_pending = true;
810 sc->sched.wait_switch = true;
811 sc->sched.offchannel_duration =
812 jiffies_to_usecs(sc->offchannel.duration) +
813 sc->sched.channel_switch_time;
814
815 spin_unlock_bh(&sc->chan_lock);
816 ath_dbg(common, CHAN_CTX,
817 "Set offchannel_pending to true\n");
818 return;
819 }
820
821 sc->next_chan = ctx;
822 if (chandef) {
823 ctx->chandef = *chandef;
824 ath_dbg(common, CHAN_CTX,
825 "Assigned next_chan to %d MHz\n", chandef->center_freq1);
826 }
827
828 if (sc->next_chan == &sc->offchannel.chan) {
829 sc->sched.offchannel_duration =
830 jiffies_to_usecs(sc->offchannel.duration) +
831 sc->sched.channel_switch_time;
832
833 if (chandef) {
834 ath_dbg(common, CHAN_CTX,
835 "Offchannel duration for chan %d MHz : %u\n",
836 chandef->center_freq1,
837 sc->sched.offchannel_duration);
838 }
839 }
840 spin_unlock_bh(&sc->chan_lock);
841 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
842}
843
844static void ath_chanctx_offchan_switch(struct ath_softc *sc,
845 struct ieee80211_channel *chan)
846{
847 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
848 struct cfg80211_chan_def chandef;
849
850 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
851 ath_dbg(common, CHAN_CTX,
852 "Channel definition created: %d MHz\n", chandef.center_freq1);
853
854 ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
855}
856
857static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
858 bool active)
859{
860 struct ath_chanctx *ctx;
861
862 ath_for_each_chanctx(sc, ctx) {
863 if (!ctx->assigned || list_empty(&ctx->vifs))
864 continue;
865 if (active && !ctx->active)
866 continue;
867
868 if (ctx->switch_after_beacon)
869 return ctx;
870 }
871
872 return &sc->chanctx[0];
873}
874
875static void
876ath_scan_next_channel(struct ath_softc *sc)
877{
878 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
879 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
880 struct ieee80211_channel *chan;
881
882 if (sc->offchannel.scan_idx >= req->n_channels) {
883 ath_dbg(common, CHAN_CTX,
884 "Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
885 "scan_idx: %d, n_channels: %d\n",
886 sc->offchannel.scan_idx,
887 req->n_channels);
888
889 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
890 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
891 NULL);
892 return;
893 }
894
895 ath_dbg(common, CHAN_CTX,
896 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
897 sc->offchannel.scan_idx);
898
899 chan = req->channels[sc->offchannel.scan_idx++];
900 sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
901 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
902
903 ath_chanctx_offchan_switch(sc, chan);
904}
905
906void ath_offchannel_next(struct ath_softc *sc)
907{
908 struct ieee80211_vif *vif;
909
910 if (sc->offchannel.scan_req) {
911 vif = sc->offchannel.scan_vif;
912 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
913 ath_scan_next_channel(sc);
914 } else if (sc->offchannel.roc_vif) {
915 vif = sc->offchannel.roc_vif;
916 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
917 sc->offchannel.duration =
918 msecs_to_jiffies(sc->offchannel.roc_duration);
919 sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
920 ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
921 } else {
922 spin_lock_bh(&sc->chan_lock);
923 sc->sched.offchannel_pending = false;
924 sc->sched.wait_switch = false;
925 spin_unlock_bh(&sc->chan_lock);
926
927 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
928 NULL);
929 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
930 if (sc->ps_idle)
931 ath_cancel_work(sc);
932 }
933}
934
935void ath_roc_complete(struct ath_softc *sc, enum ath_roc_complete_reason reason)
936{
937 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
938
939 sc->offchannel.roc_vif = NULL;
940 sc->offchannel.roc_chan = NULL;
941
942 switch (reason) {
943 case ATH_ROC_COMPLETE_ABORT:
944 ath_dbg(common, CHAN_CTX, "RoC aborted\n");
945 ieee80211_remain_on_channel_expired(sc->hw);
946 break;
947 case ATH_ROC_COMPLETE_EXPIRE:
948 ath_dbg(common, CHAN_CTX, "RoC expired\n");
949 ieee80211_remain_on_channel_expired(sc->hw);
950 break;
951 case ATH_ROC_COMPLETE_CANCEL:
952 ath_dbg(common, CHAN_CTX, "RoC canceled\n");
953 break;
954 }
955
956 ath_offchannel_next(sc);
957 ath9k_ps_restore(sc);
958}
959
960void ath_scan_complete(struct ath_softc *sc, bool abort)
961{
962 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
963
964 if (abort)
965 ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
966 else
967 ath_dbg(common, CHAN_CTX, "HW scan complete\n");
968
969 sc->offchannel.scan_req = NULL;
970 sc->offchannel.scan_vif = NULL;
971 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
972 ieee80211_scan_completed(sc->hw, abort);
973 clear_bit(ATH_OP_SCANNING, &common->op_flags);
974 spin_lock_bh(&sc->chan_lock);
975 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
976 sc->sched.force_noa_update = true;
977 spin_unlock_bh(&sc->chan_lock);
978 ath_offchannel_next(sc);
979 ath9k_ps_restore(sc);
980}
981
982static void ath_scan_send_probe(struct ath_softc *sc,
983 struct cfg80211_ssid *ssid)
984{
985 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
986 struct ieee80211_vif *vif = sc->offchannel.scan_vif;
987 struct ath_tx_control txctl = {};
988 struct sk_buff *skb;
989 struct ieee80211_tx_info *info;
990 int band = sc->offchannel.chan.chandef.chan->band;
991
992 skb = ieee80211_probereq_get(sc->hw, vif->addr,
993 ssid->ssid, ssid->ssid_len, req->ie_len);
994 if (!skb)
995 return;
996
997 info = IEEE80211_SKB_CB(skb);
998 if (req->no_cck)
999 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
1000
1001 if (req->ie_len)
1002 memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
1003
1004 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
1005
1006 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
1007 goto error;
1008
1009 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
1010 txctl.force_channel = true;
1011 if (ath_tx_start(sc->hw, skb, &txctl))
1012 goto error;
1013
1014 return;
1015
1016error:
1017 ieee80211_free_txskb(sc->hw, skb);
1018}
1019
1020static void ath_scan_channel_start(struct ath_softc *sc)
1021{
1022 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1023 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
1024 int i;
1025
1026 if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
1027 req->n_ssids) {
1028 for (i = 0; i < req->n_ssids; i++)
1029 ath_scan_send_probe(sc, &req->ssids[i]);
1030
1031 }
1032
1033 ath_dbg(common, CHAN_CTX,
1034 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
1035
1036 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
1037 mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
1038}
1039
1040static void ath_chanctx_timer(unsigned long data)
1041{
1042 struct ath_softc *sc = (struct ath_softc *) data;
1043 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1044
1045 ath_dbg(common, CHAN_CTX,
1046 "Channel context timer invoked\n");
1047
1048 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1049}
1050
1051static void ath_offchannel_timer(unsigned long data)
1052{
1053 struct ath_softc *sc = (struct ath_softc *)data;
1054 struct ath_chanctx *ctx;
1055 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1056
1057 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
1058 __func__, offchannel_state_string(sc->offchannel.state));
1059
1060 switch (sc->offchannel.state) {
1061 case ATH_OFFCHANNEL_PROBE_WAIT:
1062 if (!sc->offchannel.scan_req)
1063 return;
1064
1065 /* get first active channel context */
1066 ctx = ath_chanctx_get_oper_chan(sc, true);
1067 if (ctx->active) {
1068 ath_dbg(common, CHAN_CTX,
1069 "Switch to oper/active context, "
1070 "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
1071
1072 sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
1073 ath_chanctx_switch(sc, ctx, NULL);
1074 mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
1075 break;
1076 }
1077 /* fall through */
1078 case ATH_OFFCHANNEL_SUSPEND:
1079 if (!sc->offchannel.scan_req)
1080 return;
1081
1082 ath_scan_next_channel(sc);
1083 break;
1084 case ATH_OFFCHANNEL_ROC_START:
1085 case ATH_OFFCHANNEL_ROC_WAIT:
1086 sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
1087 ath_roc_complete(sc, ATH_ROC_COMPLETE_EXPIRE);
1088 break;
1089 default:
1090 break;
1091 }
1092}
1093
1094static bool
1095ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
1096 bool powersave)
1097{
1098 struct ieee80211_vif *vif = avp->vif;
1099 struct ieee80211_sta *sta = NULL;
1100 struct ieee80211_hdr_3addr *nullfunc;
1101 struct ath_tx_control txctl;
1102 struct sk_buff *skb;
1103 int band = sc->cur_chan->chandef.chan->band;
1104
1105 switch (vif->type) {
1106 case NL80211_IFTYPE_STATION:
1107 if (!avp->assoc)
1108 return false;
1109
1110 skb = ieee80211_nullfunc_get(sc->hw, vif);
1111 if (!skb)
1112 return false;
1113
1114 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
1115 if (powersave)
1116 nullfunc->frame_control |=
1117 cpu_to_le16(IEEE80211_FCTL_PM);
1118
1119 skb->priority = 7;
1120 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
1121 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
1122 dev_kfree_skb_any(skb);
1123 return false;
1124 }
1125 break;
1126 default:
1127 return false;
1128 }
1129
1130 memset(&txctl, 0, sizeof(txctl));
1131 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
1132 txctl.sta = sta;
1133 txctl.force_channel = true;
1134 if (ath_tx_start(sc->hw, skb, &txctl)) {
1135 ieee80211_free_txskb(sc->hw, skb);
1136 return false;
1137 }
1138
1139 return true;
1140}
1141
1142static bool
1143ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
1144{
1145 struct ath_vif *avp;
1146 bool sent = false;
1147
1148 rcu_read_lock();
1149 list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
1150 if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
1151 sent = true;
1152 }
1153 rcu_read_unlock();
1154
1155 return sent;
1156}
1157
1158static bool ath_chanctx_defer_switch(struct ath_softc *sc)
1159{
1160 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1161
1162 if (sc->cur_chan == &sc->offchannel.chan)
1163 return false;
1164
1165 switch (sc->sched.state) {
1166 case ATH_CHANCTX_STATE_SWITCH:
1167 return false;
1168 case ATH_CHANCTX_STATE_IDLE:
1169 if (!sc->cur_chan->switch_after_beacon)
1170 return false;
1171
1172 ath_dbg(common, CHAN_CTX,
1173 "Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
1174
1175 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
1176 break;
1177 default:
1178 break;
1179 }
1180
1181 return true;
1182}
1183
1184static void ath_offchannel_channel_change(struct ath_softc *sc)
1185{
1186 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1187
1188 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
1189 __func__, offchannel_state_string(sc->offchannel.state));
1190
1191 switch (sc->offchannel.state) {
1192 case ATH_OFFCHANNEL_PROBE_SEND:
1193 if (!sc->offchannel.scan_req)
1194 return;
1195
1196 if (sc->cur_chan->chandef.chan !=
1197 sc->offchannel.chan.chandef.chan)
1198 return;
1199
1200 ath_scan_channel_start(sc);
1201 break;
1202 case ATH_OFFCHANNEL_IDLE:
1203 if (!sc->offchannel.scan_req)
1204 return;
1205
1206 ath_scan_complete(sc, false);
1207 break;
1208 case ATH_OFFCHANNEL_ROC_START:
1209 if (sc->cur_chan != &sc->offchannel.chan)
1210 break;
1211
1212 sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
1213 mod_timer(&sc->offchannel.timer,
1214 jiffies + sc->offchannel.duration);
1215 ieee80211_ready_on_channel(sc->hw);
1216 break;
1217 case ATH_OFFCHANNEL_ROC_DONE:
1218 break;
1219 default:
1220 break;
1221 }
1222}
1223
1224void ath_chanctx_set_next(struct ath_softc *sc, bool force)
1225{
1226 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1227 struct ath_chanctx *old_ctx;
1228 struct timespec ts;
1229 bool measure_time = false;
1230 bool send_ps = false;
1231 bool queues_stopped = false;
1232
1233 spin_lock_bh(&sc->chan_lock);
1234 if (!sc->next_chan) {
1235 spin_unlock_bh(&sc->chan_lock);
1236 return;
1237 }
1238
1239 if (!force && ath_chanctx_defer_switch(sc)) {
1240 spin_unlock_bh(&sc->chan_lock);
1241 return;
1242 }
1243
1244 ath_dbg(common, CHAN_CTX,
1245 "%s: current: %d MHz, next: %d MHz\n",
1246 __func__,
1247 sc->cur_chan->chandef.center_freq1,
1248 sc->next_chan->chandef.center_freq1);
1249
1250 if (sc->cur_chan != sc->next_chan) {
1251 ath_dbg(common, CHAN_CTX,
1252 "Stopping current chanctx: %d\n",
1253 sc->cur_chan->chandef.center_freq1);
1254 sc->cur_chan->stopped = true;
1255 spin_unlock_bh(&sc->chan_lock);
1256
1257 if (sc->next_chan == &sc->offchannel.chan) {
1258 getrawmonotonic(&ts);
1259 measure_time = true;
1260 }
1261
1262 ath9k_chanctx_stop_queues(sc, sc->cur_chan);
1263 queues_stopped = true;
1264
1265 __ath9k_flush(sc->hw, ~0, true, false, false);
1266
1267 if (ath_chanctx_send_ps_frame(sc, true))
1268 __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO),
1269 false, false, false);
1270
1271 send_ps = true;
1272 spin_lock_bh(&sc->chan_lock);
1273
1274 if (sc->cur_chan != &sc->offchannel.chan) {
1275 getrawmonotonic(&sc->cur_chan->tsf_ts);
1276 sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
1277 }
1278 }
1279 old_ctx = sc->cur_chan;
1280 sc->cur_chan = sc->next_chan;
1281 sc->cur_chan->stopped = false;
1282 sc->next_chan = NULL;
1283
1284 if (!sc->sched.offchannel_pending)
1285 sc->sched.offchannel_duration = 0;
1286
1287 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
1288 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
1289
1290 spin_unlock_bh(&sc->chan_lock);
1291
1292 if (sc->sc_ah->chip_fullsleep ||
1293 memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
1294 sizeof(sc->cur_chandef))) {
1295 ath_dbg(common, CHAN_CTX,
1296 "%s: Set channel %d MHz\n",
1297 __func__, sc->cur_chan->chandef.center_freq1);
1298 ath_set_channel(sc);
1299 if (measure_time)
1300 sc->sched.channel_switch_time =
1301 ath9k_hw_get_tsf_offset(&ts, NULL);
1302 /*
1303 * A reset will ensure that all queues are woken up,
1304 * so there is no need to awaken them again.
1305 */
1306 goto out;
1307 }
1308
1309 if (queues_stopped)
1310 ath9k_chanctx_wake_queues(sc, old_ctx);
1311out:
1312 if (send_ps)
1313 ath_chanctx_send_ps_frame(sc, false);
1314
1315 ath_offchannel_channel_change(sc);
1316 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
1317}
1318
1319static void ath_chanctx_work(struct work_struct *work)
1320{
1321 struct ath_softc *sc = container_of(work, struct ath_softc,
1322 chanctx_work);
1323 mutex_lock(&sc->mutex);
1324 ath_chanctx_set_next(sc, false);
1325 mutex_unlock(&sc->mutex);
1326}
1327
1328void ath9k_offchannel_init(struct ath_softc *sc)
1329{
1330 struct ath_chanctx *ctx;
1331 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1332 struct ieee80211_supported_band *sband;
1333 struct ieee80211_channel *chan;
1334 int i;
1335
1336 sband = &common->sbands[IEEE80211_BAND_2GHZ];
1337 if (!sband->n_channels)
1338 sband = &common->sbands[IEEE80211_BAND_5GHZ];
1339
1340 chan = &sband->channels[0];
1341
1342 ctx = &sc->offchannel.chan;
1343 INIT_LIST_HEAD(&ctx->vifs);
1344 ctx->txpower = ATH_TXPOWER_MAX;
1345 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
1346
1347 for (i = 0; i < ARRAY_SIZE(ctx->acq); i++)
1348 INIT_LIST_HEAD(&ctx->acq[i]);
1349
1350 sc->offchannel.chan.offchannel = true;
1351}
1352
1353void ath9k_init_channel_context(struct ath_softc *sc)
1354{
1355 INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
1356
1357 setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
1358 (unsigned long)sc);
1359 setup_timer(&sc->sched.timer, ath_chanctx_timer,
1360 (unsigned long)sc);
1361
1362 init_completion(&sc->go_beacon);
1363}
1364
1365void ath9k_deinit_channel_context(struct ath_softc *sc)
1366{
1367 cancel_work_sync(&sc->chanctx_work);
1368}
1369
1370bool ath9k_is_chanctx_enabled(void)
1371{
1372 return (ath9k_use_chanctx == 1);
1373}
1374
1375/********************/
1376/* Queue management */
1377/********************/
1378
1379void ath9k_chanctx_stop_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1380{
1381 struct ath_hw *ah = sc->sc_ah;
1382 int i;
1383
1384 if (ctx == &sc->offchannel.chan) {
1385 ieee80211_stop_queue(sc->hw,
1386 sc->hw->offchannel_tx_hw_queue);
1387 } else {
1388 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1389 ieee80211_stop_queue(sc->hw,
1390 ctx->hw_queue_base + i);
1391 }
1392
1393 if (ah->opmode == NL80211_IFTYPE_AP)
1394 ieee80211_stop_queue(sc->hw, sc->hw->queues - 2);
1395}
1396
1397
1398void ath9k_chanctx_wake_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
1399{
1400 struct ath_hw *ah = sc->sc_ah;
1401 int i;
1402
1403 if (ctx == &sc->offchannel.chan) {
1404 ieee80211_wake_queue(sc->hw,
1405 sc->hw->offchannel_tx_hw_queue);
1406 } else {
1407 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1408 ieee80211_wake_queue(sc->hw,
1409 ctx->hw_queue_base + i);
1410 }
1411
1412 if (ah->opmode == NL80211_IFTYPE_AP)
1413 ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
1414}
1415
1416/*****************/
1417/* P2P Powersave */
1418/*****************/
1419
1420static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
1421{
1422 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1423 struct ath_hw *ah = sc->sc_ah;
1424 u32 tsf, target_tsf;
1425
1426 if (!avp || !avp->noa.has_next_tsf)
1427 return;
1428
1429 ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
1430
1431 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1432
1433 target_tsf = avp->noa.next_tsf;
1434 if (!avp->noa.absent)
1435 target_tsf -= ATH_P2P_PS_STOP_TIME;
1436 else
1437 target_tsf += ATH_P2P_PS_STOP_TIME;
1438
1439 if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
1440 target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
1441
1442 ath_dbg(common, CHAN_CTX, "%s absent %d tsf 0x%08X next_tsf 0x%08X (%dms)\n",
1443 __func__, avp->noa.absent, tsf, target_tsf,
1444 (target_tsf - tsf) / 1000);
1445
1446 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, target_tsf, 1000000);
1447}
1448
1449static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
1450{
1451 struct ath_vif *avp = (void *)vif->drv_priv;
1452 u32 tsf;
1453
1454 if (!sc->p2p_ps_timer)
1455 return;
1456
1457 if (vif->type != NL80211_IFTYPE_STATION)
1458 return;
1459
1460 sc->p2p_ps_vif = avp;
1461
1462 if (sc->ps_flags & PS_BEACON_SYNC)
1463 return;
1464
1465 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1466 ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
1467 ath9k_update_p2p_ps_timer(sc, avp);
1468}
1469
1470static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
1471{
1472 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
1473 u8 switch_time, ctwin;
1474
1475 /*
1476 * Channel switch in multi-channel mode is deferred
1477 * by a quarter beacon interval when handling
1478 * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
1479 * interface is guaranteed to be discoverable
1480 * for that duration after a TBTT.
1481 */
1482 switch_time = cur_conf->beacon_interval / 4;
1483
1484 ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
1485 if (ctwin && (ctwin < switch_time))
1486 return ctwin;
1487
1488 if (switch_time < P2P_DEFAULT_CTWIN)
1489 return 0;
1490
1491 return P2P_DEFAULT_CTWIN;
1492}
1493
1494void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
1495 struct sk_buff *skb)
1496{
1497 static const u8 noa_ie_hdr[] = {
1498 WLAN_EID_VENDOR_SPECIFIC, /* type */
1499 0, /* length */
1500 0x50, 0x6f, 0x9a, /* WFA OUI */
1501 0x09, /* P2P subtype */
1502 0x0c, /* Notice of Absence */
1503 0x00, /* LSB of little-endian len */
1504 0x00, /* MSB of little-endian len */
1505 };
1506
1507 struct ieee80211_p2p_noa_attr *noa;
1508 int noa_len, noa_desc, i = 0;
1509 u8 *hdr;
1510
1511 if (!avp->offchannel_duration && !avp->noa_duration)
1512 return;
1513
1514 noa_desc = !!avp->offchannel_duration + !!avp->noa_duration;
1515 noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
1516
1517 hdr = skb_put(skb, sizeof(noa_ie_hdr));
1518 memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
1519 hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
1520 hdr[7] = noa_len;
1521
1522 noa = (void *) skb_put(skb, noa_len);
1523 memset(noa, 0, noa_len);
1524
1525 noa->index = avp->noa_index;
1526 noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
1527 if (noa->oppps_ctwindow)
1528 noa->oppps_ctwindow |= BIT(7);
1529
1530 if (avp->noa_duration) {
1531 if (avp->periodic_noa) {
1532 u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
1533 noa->desc[i].count = 255;
1534 noa->desc[i].interval = cpu_to_le32(interval);
1535 } else {
1536 noa->desc[i].count = 1;
1537 }
1538
1539 noa->desc[i].start_time = cpu_to_le32(avp->noa_start);
1540 noa->desc[i].duration = cpu_to_le32(avp->noa_duration);
1541 i++;
1542 }
1543
1544 if (avp->offchannel_duration) {
1545 noa->desc[i].count = 1;
1546 noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
1547 noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
1548 }
1549}
1550
1551void ath9k_p2p_ps_timer(void *priv)
1552{
1553 struct ath_softc *sc = priv;
1554 struct ath_vif *avp = sc->p2p_ps_vif;
1555 struct ieee80211_vif *vif;
1556 struct ieee80211_sta *sta;
1557 struct ath_node *an;
1558 u32 tsf;
1559
1560 del_timer_sync(&sc->sched.timer);
1561 ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
1562 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1563
1564 if (!avp || avp->chanctx != sc->cur_chan)
1565 return;
1566
1567 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1568 if (!avp->noa.absent)
1569 tsf += ATH_P2P_PS_STOP_TIME;
1570 else
1571 tsf -= ATH_P2P_PS_STOP_TIME;
1572
1573 if (!avp->noa.has_next_tsf ||
1574 avp->noa.next_tsf - tsf > BIT(31))
1575 ieee80211_update_p2p_noa(&avp->noa, tsf);
1576
1577 ath9k_update_p2p_ps_timer(sc, avp);
1578
1579 rcu_read_lock();
1580
1581 vif = avp->vif;
1582 sta = ieee80211_find_sta(vif, avp->bssid);
1583 if (!sta)
1584 goto out;
1585
1586 an = (void *) sta->drv_priv;
1587 if (an->sleeping == !!avp->noa.absent)
1588 goto out;
1589
1590 an->sleeping = avp->noa.absent;
1591 if (an->sleeping)
1592 ath_tx_aggr_sleep(sta, sc, an);
1593 else
1594 ath_tx_aggr_wakeup(sc, an);
1595
1596out:
1597 rcu_read_unlock();
1598}
1599
1600void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
1601 struct ieee80211_vif *vif)
1602{
1603 unsigned long flags;
1604
1605 spin_lock_bh(&sc->sc_pcu_lock);
1606 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1607 ath9k_update_p2p_ps(sc, vif);
1608 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1609 spin_unlock_bh(&sc->sc_pcu_lock);
1610}
1611
1612void ath9k_p2p_beacon_sync(struct ath_softc *sc)
1613{
1614 if (sc->p2p_ps_vif)
1615 ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
1616}
1617
1618void ath9k_p2p_remove_vif(struct ath_softc *sc,
1619 struct ieee80211_vif *vif)
1620{
1621 struct ath_vif *avp = (void *)vif->drv_priv;
1622
1623 spin_lock_bh(&sc->sc_pcu_lock);
1624 if (avp == sc->p2p_ps_vif) {
1625 sc->p2p_ps_vif = NULL;
1626 ath9k_update_p2p_ps_timer(sc, NULL);
1627 }
1628 spin_unlock_bh(&sc->sc_pcu_lock);
1629}
1630
1631int ath9k_init_p2p(struct ath_softc *sc)
1632{
1633 sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
1634 NULL, sc, AR_FIRST_NDP_TIMER);
1635 if (!sc->p2p_ps_timer)
1636 return -ENOMEM;
1637
1638 return 0;
1639}
1640
1641void ath9k_deinit_p2p(struct ath_softc *sc)
1642{
1643 if (sc->p2p_ps_timer)
1644 ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
1645}
1646
1647#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */