2 * Copyright (c) 2014 Qualcomm Atheros, Inc.
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.
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.
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.
23 static int ath_set_channel(struct ath_softc *sc)
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;
35 if (test_bit(ATH_OP_INVALID, &common->op_flags))
39 old_pos = ah->curchan - &ah->channels[0];
41 ath_dbg(common, CONFIG, "Set channel: %d MHz width: %d\n",
42 chan->center_freq, chandef->width);
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);
49 ath9k_cmn_get_channel(hw, ah, chandef);
51 /* If the operating channel changes, change the survey in-use flags
53 * Reset the survey data for the new channel, unless we're switching
54 * back to the operating channel from an off-channel operation.
56 if (!sc->cur_chan->offchannel && sc->cur_survey != &sc->survey[pos]) {
58 sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
60 sc->cur_survey = &sc->survey[pos];
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));
68 hchan = &sc->sc_ah->channels[pos];
69 r = ath_reset_internal(sc, hchan);
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.
78 ath_update_survey_nf(sc, old_pos);
80 /* Enable radar pulse detection if on a DFS channel. Spectral
81 * scanning and radar detection can not be used concurrently.
83 if (hw->conf.radar_enabled) {
86 /* set HW specific DFS configuration */
87 ath9k_hw_set_radar_params(ah);
88 rxfilter = ath9k_hw_getrxfilter(ah);
89 rxfilter |= ATH9K_RX_FILTER_PHYRADAR |
90 ATH9K_RX_FILTER_PHYERR;
91 ath9k_hw_setrxfilter(ah, rxfilter);
92 ath_dbg(common, DFS, "DFS enabled at freq %d\n",
95 /* perform spectral scan if requested. */
96 if (test_bit(ATH_OP_SCANNING, &common->op_flags) &&
97 sc->spectral_mode == SPECTRAL_CHANSCAN)
98 ath9k_spectral_scan_trigger(hw);
104 void ath_chanctx_init(struct ath_softc *sc)
106 struct ath_chanctx *ctx;
107 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
108 struct ieee80211_supported_band *sband;
109 struct ieee80211_channel *chan;
112 sband = &common->sbands[IEEE80211_BAND_2GHZ];
113 if (!sband->n_channels)
114 sband = &common->sbands[IEEE80211_BAND_5GHZ];
116 chan = &sband->channels[0];
117 for (i = 0; i < ATH9K_NUM_CHANCTX; i++) {
118 ctx = &sc->chanctx[i];
119 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
120 INIT_LIST_HEAD(&ctx->vifs);
121 ctx->txpower = ATH_TXPOWER_MAX;
122 for (j = 0; j < ARRAY_SIZE(ctx->acq); j++)
123 INIT_LIST_HEAD(&ctx->acq[j]);
127 void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
128 struct cfg80211_chan_def *chandef)
130 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
133 spin_lock_bh(&sc->chan_lock);
135 memcpy(&ctx->chandef, chandef, sizeof(*chandef));
136 cur_chan = sc->cur_chan == ctx;
137 spin_unlock_bh(&sc->chan_lock);
140 ath_dbg(common, CHAN_CTX,
141 "Current context differs from the new context\n");
148 #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
150 /**********************************************************/
151 /* Functions to handle the channel context state machine. */
152 /**********************************************************/
154 static const char *offchannel_state_string(enum ath_offchannel_state state)
157 case_rtn_string(ATH_OFFCHANNEL_IDLE);
158 case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
159 case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
160 case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
161 case_rtn_string(ATH_OFFCHANNEL_ROC_START);
162 case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
163 case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
169 static const char *chanctx_event_string(enum ath_chanctx_event ev)
172 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
173 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
174 case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
175 case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
176 case_rtn_string(ATH_CHANCTX_EVENT_ASSOC);
177 case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
178 case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
179 case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
180 case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
181 case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
187 static const char *chanctx_state_string(enum ath_chanctx_state state)
190 case_rtn_string(ATH_CHANCTX_STATE_IDLE);
191 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
192 case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
193 case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
194 case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
200 void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
202 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
210 list_for_each_entry(avp, &ctx->vifs, list) {
211 struct ieee80211_vif *vif = avp->vif;
214 case NL80211_IFTYPE_P2P_CLIENT:
215 case NL80211_IFTYPE_STATION:
216 if (vif->bss_conf.assoc)
224 ctx->active = active;
226 ath_for_each_chanctx(sc, ctx) {
227 if (!ctx->assigned || list_empty(&ctx->vifs))
233 clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
236 if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
239 if (ath9k_is_chanctx_enabled()) {
240 ath_chanctx_event(sc, NULL,
241 ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
245 static struct ath_chanctx *
246 ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
248 int idx = ctx - &sc->chanctx[0];
250 return &sc->chanctx[!idx];
253 static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
255 struct ath_chanctx *prev, *cur;
257 u32 cur_tsf, prev_tsf, beacon_int;
260 beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
263 prev = ath_chanctx_get_next(sc, cur);
265 getrawmonotonic(&ts);
266 cur_tsf = (u32) cur->tsf_val +
267 ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
269 prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
270 prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
272 /* Adjust the TSF time of the AP chanctx to keep its beacons
273 * at half beacon interval offset relative to the STA chanctx.
275 offset = cur_tsf - prev_tsf;
277 /* Ignore stale data or spurious timestamps */
278 if (offset < 0 || offset > 3 * beacon_int)
281 offset = beacon_int / 2 - (offset % beacon_int);
282 prev->tsf_val += offset;
285 /* Configure the TSF based hardware timer for a channel switch.
286 * Also set up backup software timer, in case the gen timer fails.
287 * This could be caused by a hardware reset.
289 static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time)
291 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
292 struct ath_hw *ah = sc->sc_ah;
294 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
295 tsf_time -= ath9k_hw_gettsf32(ah);
296 tsf_time = msecs_to_jiffies(tsf_time / 1000) + 1;
297 mod_timer(&sc->sched.timer, jiffies + tsf_time);
299 ath_dbg(common, CHAN_CTX,
300 "Setup chanctx timer with timeout: %d ms\n", jiffies_to_msecs(tsf_time));
303 void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
304 enum ath_chanctx_event ev)
306 struct ath_hw *ah = sc->sc_ah;
307 struct ath_common *common = ath9k_hw_common(ah);
308 struct ath_beacon_config *cur_conf;
309 struct ath_vif *avp = NULL;
310 struct ath_chanctx *ctx;
313 bool noa_changed = false;
316 avp = (struct ath_vif *) vif->drv_priv;
318 spin_lock_bh(&sc->chan_lock);
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));
326 case ATH_CHANCTX_EVENT_BEACON_PREPARE:
327 if (avp->offchannel_duration)
328 avp->offchannel_duration = 0;
330 if (avp->chanctx != sc->cur_chan) {
331 ath_dbg(common, CHAN_CTX,
332 "Contexts differ, not preparing beacon\n");
336 if (sc->sched.offchannel_pending) {
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");
344 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
345 if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) {
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");
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");
359 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
362 ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr);
364 sc->sched.beacon_pending = true;
365 sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER);
367 cur_conf = &sc->cur_chan->beacon;
368 beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
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;
375 /* Prevent wrap-around issues */
376 if (avp->periodic_noa_duration &&
377 tsf_time - avp->periodic_noa_start > BIT(30))
378 avp->periodic_noa_duration = 0;
381 avp->periodic_noa_start = tsf_time;
382 avp->periodic_noa_duration =
383 TU_TO_USEC(cur_conf->beacon_interval) / 2 -
384 sc->sched.channel_switch_time;
386 } else if (!ctx->active) {
387 avp->periodic_noa_duration = 0;
391 /* If at least two consecutive beacons were missed on the STA
392 * chanctx, stay on the STA channel for one extra beacon period,
393 * to resync the timer properly.
395 if (ctx->active && sc->sched.beacon_miss >= 2)
396 sc->sched.offchannel_duration = 3 * beacon_int / 2;
398 if (sc->sched.offchannel_duration) {
400 avp->offchannel_start = tsf_time;
401 avp->offchannel_duration =
402 sc->sched.offchannel_duration;
408 ath_dbg(common, CHAN_CTX,
409 "periodic_noa_duration: %d, periodic_noa_start: %d, noa_index: %d\n",
410 avp->periodic_noa_duration,
411 avp->periodic_noa_start,
415 case ATH_CHANCTX_EVENT_BEACON_SENT:
416 if (!sc->sched.beacon_pending) {
417 ath_dbg(common, CHAN_CTX,
418 "No pending beacon\n");
422 sc->sched.beacon_pending = false;
423 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
426 ath_dbg(common, CHAN_CTX,
427 "Move chanctx state to WAIT_FOR_TIMER\n");
429 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
430 ath_chanctx_setup_timer(sc, sc->sched.switch_start_time);
432 case ATH_CHANCTX_EVENT_TSF_TIMER:
433 if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER)
436 if (!sc->cur_chan->switch_after_beacon &&
437 sc->sched.beacon_pending)
438 sc->sched.beacon_miss++;
440 ath_dbg(common, CHAN_CTX,
441 "Move chanctx state to SWITCH\n");
443 sc->sched.state = ATH_CHANCTX_STATE_SWITCH;
444 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
446 case ATH_CHANCTX_EVENT_BEACON_RECEIVED:
447 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
448 sc->cur_chan == &sc->offchannel.chan)
451 ath_chanctx_adjust_tbtt_delta(sc);
452 sc->sched.beacon_pending = false;
453 sc->sched.beacon_miss = 0;
455 /* TSF time might have been updated by the incoming beacon,
456 * need update the channel switch timer to reflect the change.
458 tsf_time = sc->sched.switch_start_time;
459 tsf_time -= (u32) sc->cur_chan->tsf_val +
460 ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
461 tsf_time += ath9k_hw_gettsf32(ah);
464 ath_chanctx_setup_timer(sc, tsf_time);
466 case ATH_CHANCTX_EVENT_ASSOC:
467 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
468 avp->chanctx != sc->cur_chan)
471 ath_dbg(common, CHAN_CTX,
472 "Move chanctx state from FORCE_ACTIVE to IDLE\n");
474 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
476 case ATH_CHANCTX_EVENT_SWITCH:
477 if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
478 sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
479 sc->cur_chan->switch_after_beacon ||
480 sc->cur_chan == &sc->offchannel.chan)
483 /* If this is a station chanctx, stay active for a half
484 * beacon period (minus channel switch time)
486 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
487 cur_conf = &sc->cur_chan->beacon;
489 ath_dbg(common, CHAN_CTX,
490 "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
492 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
494 tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
495 if (sc->sched.beacon_miss >= 2) {
496 sc->sched.beacon_miss = 0;
500 tsf_time -= sc->sched.channel_switch_time;
501 tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
502 sc->sched.switch_start_time = tsf_time;
504 ath_chanctx_setup_timer(sc, tsf_time);
505 sc->sched.beacon_pending = true;
507 case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
508 if (sc->cur_chan == &sc->offchannel.chan ||
509 sc->cur_chan->switch_after_beacon)
512 sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
513 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
515 case ATH_CHANCTX_EVENT_UNASSIGN:
516 if (sc->cur_chan->assigned) {
517 if (sc->next_chan && !sc->next_chan->assigned &&
518 sc->next_chan != &sc->offchannel.chan)
519 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
523 ctx = ath_chanctx_get_next(sc, sc->cur_chan);
524 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
529 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
531 case ATH_CHANCTX_EVENT_ASSIGN:
533 * When adding a new channel context, check if a scan
534 * is in progress and abort it since the addition of
535 * a new channel context is usually followed by VIF
536 * assignment, in which case we have to start multi-channel
539 if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
540 ath_dbg(common, CHAN_CTX,
541 "Aborting HW scan to add new context\n");
543 spin_unlock_bh(&sc->chan_lock);
544 del_timer_sync(&sc->offchannel.timer);
545 ath_scan_complete(sc, true);
546 spin_lock_bh(&sc->chan_lock);
549 case ATH_CHANCTX_EVENT_CHANGE:
553 spin_unlock_bh(&sc->chan_lock);
556 void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
557 enum ath_chanctx_event ev)
559 if (sc->sched.beacon_pending)
560 ath_chanctx_event(sc, NULL, ev);
563 void ath_chanctx_beacon_recv_ev(struct ath_softc *sc, u32 ts,
564 enum ath_chanctx_event ev)
566 sc->sched.next_tbtt = ts;
567 ath_chanctx_event(sc, NULL, ev);
570 static int ath_scan_channel_duration(struct ath_softc *sc,
571 struct ieee80211_channel *chan)
573 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
575 if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
576 return (HZ / 9); /* ~110 ms */
578 return (HZ / 16); /* ~60 ms */
581 static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
582 struct cfg80211_chan_def *chandef)
584 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
586 spin_lock_bh(&sc->chan_lock);
588 if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
589 (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
590 sc->sched.offchannel_pending = true;
591 spin_unlock_bh(&sc->chan_lock);
597 ctx->chandef = *chandef;
598 ath_dbg(common, CHAN_CTX,
599 "Assigned next_chan to %d MHz\n", chandef->center_freq1);
602 if (sc->next_chan == &sc->offchannel.chan) {
603 sc->sched.offchannel_duration =
604 jiffies_to_usecs(sc->offchannel.duration) +
605 sc->sched.channel_switch_time;
608 ath_dbg(common, CHAN_CTX,
609 "Offchannel duration for chan %d MHz : %u\n",
610 chandef->center_freq1,
611 sc->sched.offchannel_duration);
614 spin_unlock_bh(&sc->chan_lock);
615 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
618 static void ath_chanctx_offchan_switch(struct ath_softc *sc,
619 struct ieee80211_channel *chan)
621 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
622 struct cfg80211_chan_def chandef;
624 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
625 ath_dbg(common, CHAN_CTX,
626 "Channel definition created: %d MHz\n", chandef.center_freq1);
628 ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
631 static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
634 struct ath_chanctx *ctx;
636 ath_for_each_chanctx(sc, ctx) {
637 if (!ctx->assigned || list_empty(&ctx->vifs))
639 if (active && !ctx->active)
642 if (ctx->switch_after_beacon)
646 return &sc->chanctx[0];
650 ath_scan_next_channel(struct ath_softc *sc)
652 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
653 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
654 struct ieee80211_channel *chan;
656 if (sc->offchannel.scan_idx >= req->n_channels) {
657 ath_dbg(common, CHAN_CTX,
658 "Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
659 "scan_idx: %d, n_channels: %d\n",
660 sc->offchannel.scan_idx,
663 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
664 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
669 ath_dbg(common, CHAN_CTX,
670 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
671 sc->offchannel.scan_idx);
673 chan = req->channels[sc->offchannel.scan_idx++];
674 sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
675 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
677 ath_chanctx_offchan_switch(sc, chan);
680 void ath_offchannel_next(struct ath_softc *sc)
682 struct ieee80211_vif *vif;
684 if (sc->offchannel.scan_req) {
685 vif = sc->offchannel.scan_vif;
686 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
687 ath_scan_next_channel(sc);
688 } else if (sc->offchannel.roc_vif) {
689 vif = sc->offchannel.roc_vif;
690 sc->offchannel.chan.txpower = vif->bss_conf.txpower;
691 sc->offchannel.duration =
692 msecs_to_jiffies(sc->offchannel.roc_duration);
693 sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
694 ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
696 ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
698 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
704 void ath_roc_complete(struct ath_softc *sc, bool abort)
706 sc->offchannel.roc_vif = NULL;
707 sc->offchannel.roc_chan = NULL;
709 ieee80211_remain_on_channel_expired(sc->hw);
710 ath_offchannel_next(sc);
711 ath9k_ps_restore(sc);
714 void ath_scan_complete(struct ath_softc *sc, bool abort)
716 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
719 ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
721 ath_dbg(common, CHAN_CTX, "HW scan complete\n");
723 sc->offchannel.scan_req = NULL;
724 sc->offchannel.scan_vif = NULL;
725 sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
726 ieee80211_scan_completed(sc->hw, abort);
727 clear_bit(ATH_OP_SCANNING, &common->op_flags);
728 ath_offchannel_next(sc);
729 ath9k_ps_restore(sc);
732 static void ath_scan_send_probe(struct ath_softc *sc,
733 struct cfg80211_ssid *ssid)
735 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
736 struct ieee80211_vif *vif = sc->offchannel.scan_vif;
737 struct ath_tx_control txctl = {};
739 struct ieee80211_tx_info *info;
740 int band = sc->offchannel.chan.chandef.chan->band;
742 skb = ieee80211_probereq_get(sc->hw, vif,
743 ssid->ssid, ssid->ssid_len, req->ie_len);
747 info = IEEE80211_SKB_CB(skb);
749 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
752 memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
754 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
756 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
759 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
760 txctl.force_channel = true;
761 if (ath_tx_start(sc->hw, skb, &txctl))
767 ieee80211_free_txskb(sc->hw, skb);
770 static void ath_scan_channel_start(struct ath_softc *sc)
772 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
773 struct cfg80211_scan_request *req = sc->offchannel.scan_req;
776 if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
778 for (i = 0; i < req->n_ssids; i++)
779 ath_scan_send_probe(sc, &req->ssids[i]);
783 ath_dbg(common, CHAN_CTX,
784 "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
786 sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
787 mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
790 static void ath_chanctx_timer(unsigned long data)
792 struct ath_softc *sc = (struct ath_softc *) data;
793 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
795 ath_dbg(common, CHAN_CTX,
796 "Channel context timer invoked\n");
798 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
801 static void ath_offchannel_timer(unsigned long data)
803 struct ath_softc *sc = (struct ath_softc *)data;
804 struct ath_chanctx *ctx;
805 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
807 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
808 __func__, offchannel_state_string(sc->offchannel.state));
810 switch (sc->offchannel.state) {
811 case ATH_OFFCHANNEL_PROBE_WAIT:
812 if (!sc->offchannel.scan_req)
815 /* get first active channel context */
816 ctx = ath_chanctx_get_oper_chan(sc, true);
818 ath_dbg(common, CHAN_CTX,
819 "Switch to oper/active context, "
820 "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
822 sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
823 ath_chanctx_switch(sc, ctx, NULL);
824 mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
828 case ATH_OFFCHANNEL_SUSPEND:
829 if (!sc->offchannel.scan_req)
832 ath_scan_next_channel(sc);
834 case ATH_OFFCHANNEL_ROC_START:
835 case ATH_OFFCHANNEL_ROC_WAIT:
836 ctx = ath_chanctx_get_oper_chan(sc, false);
837 sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
838 ath_chanctx_switch(sc, ctx, NULL);
846 ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
849 struct ieee80211_vif *vif = avp->vif;
850 struct ieee80211_sta *sta = NULL;
851 struct ieee80211_hdr_3addr *nullfunc;
852 struct ath_tx_control txctl;
854 int band = sc->cur_chan->chandef.chan->band;
857 case NL80211_IFTYPE_STATION:
858 if (!vif->bss_conf.assoc)
861 skb = ieee80211_nullfunc_get(sc->hw, vif);
865 nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
867 nullfunc->frame_control |=
868 cpu_to_le16(IEEE80211_FCTL_PM);
870 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
871 if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
872 dev_kfree_skb_any(skb);
880 memset(&txctl, 0, sizeof(txctl));
881 txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
883 txctl.force_channel = true;
884 if (ath_tx_start(sc->hw, skb, &txctl)) {
885 ieee80211_free_txskb(sc->hw, skb);
893 ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
899 list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
900 if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
908 static bool ath_chanctx_defer_switch(struct ath_softc *sc)
910 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
912 if (sc->cur_chan == &sc->offchannel.chan)
915 switch (sc->sched.state) {
916 case ATH_CHANCTX_STATE_SWITCH:
918 case ATH_CHANCTX_STATE_IDLE:
919 if (!sc->cur_chan->switch_after_beacon)
922 ath_dbg(common, CHAN_CTX,
923 "Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
925 sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
934 static void ath_offchannel_channel_change(struct ath_softc *sc)
936 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
938 ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
939 __func__, offchannel_state_string(sc->offchannel.state));
941 switch (sc->offchannel.state) {
942 case ATH_OFFCHANNEL_PROBE_SEND:
943 if (!sc->offchannel.scan_req)
946 if (sc->cur_chan->chandef.chan !=
947 sc->offchannel.chan.chandef.chan)
950 ath_scan_channel_start(sc);
952 case ATH_OFFCHANNEL_IDLE:
953 if (!sc->offchannel.scan_req)
956 ath_scan_complete(sc, false);
958 case ATH_OFFCHANNEL_ROC_START:
959 if (sc->cur_chan != &sc->offchannel.chan)
962 sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
963 mod_timer(&sc->offchannel.timer,
964 jiffies + sc->offchannel.duration);
965 ieee80211_ready_on_channel(sc->hw);
967 case ATH_OFFCHANNEL_ROC_DONE:
968 ath_roc_complete(sc, false);
975 void ath_chanctx_set_next(struct ath_softc *sc, bool force)
977 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
979 bool measure_time = false;
980 bool send_ps = false;
982 spin_lock_bh(&sc->chan_lock);
983 if (!sc->next_chan) {
984 spin_unlock_bh(&sc->chan_lock);
988 if (!force && ath_chanctx_defer_switch(sc)) {
989 spin_unlock_bh(&sc->chan_lock);
993 ath_dbg(common, CHAN_CTX,
994 "%s: current: %d MHz, next: %d MHz\n",
996 sc->cur_chan->chandef.center_freq1,
997 sc->next_chan->chandef.center_freq1);
999 if (sc->cur_chan != sc->next_chan) {
1000 ath_dbg(common, CHAN_CTX,
1001 "Stopping current chanctx: %d\n",
1002 sc->cur_chan->chandef.center_freq1);
1003 sc->cur_chan->stopped = true;
1004 spin_unlock_bh(&sc->chan_lock);
1006 if (sc->next_chan == &sc->offchannel.chan) {
1007 getrawmonotonic(&ts);
1008 measure_time = true;
1010 __ath9k_flush(sc->hw, ~0, true);
1012 if (ath_chanctx_send_ps_frame(sc, true))
1013 __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false);
1016 spin_lock_bh(&sc->chan_lock);
1018 if (sc->cur_chan != &sc->offchannel.chan) {
1019 getrawmonotonic(&sc->cur_chan->tsf_ts);
1020 sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
1023 sc->cur_chan = sc->next_chan;
1024 sc->cur_chan->stopped = false;
1025 sc->next_chan = NULL;
1026 sc->sched.offchannel_duration = 0;
1027 if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
1028 sc->sched.state = ATH_CHANCTX_STATE_IDLE;
1030 spin_unlock_bh(&sc->chan_lock);
1032 if (sc->sc_ah->chip_fullsleep ||
1033 memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
1034 sizeof(sc->cur_chandef))) {
1035 ath_dbg(common, CHAN_CTX,
1036 "%s: Set channel %d MHz\n",
1037 __func__, sc->cur_chan->chandef.center_freq1);
1038 ath_set_channel(sc);
1040 sc->sched.channel_switch_time =
1041 ath9k_hw_get_tsf_offset(&ts, NULL);
1044 ath_chanctx_send_ps_frame(sc, false);
1046 ath_offchannel_channel_change(sc);
1047 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
1050 static void ath_chanctx_work(struct work_struct *work)
1052 struct ath_softc *sc = container_of(work, struct ath_softc,
1054 mutex_lock(&sc->mutex);
1055 ath_chanctx_set_next(sc, false);
1056 mutex_unlock(&sc->mutex);
1059 void ath9k_offchannel_init(struct ath_softc *sc)
1061 struct ath_chanctx *ctx;
1062 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1063 struct ieee80211_supported_band *sband;
1064 struct ieee80211_channel *chan;
1067 sband = &common->sbands[IEEE80211_BAND_2GHZ];
1068 if (!sband->n_channels)
1069 sband = &common->sbands[IEEE80211_BAND_5GHZ];
1071 chan = &sband->channels[0];
1073 ctx = &sc->offchannel.chan;
1074 INIT_LIST_HEAD(&ctx->vifs);
1075 ctx->txpower = ATH_TXPOWER_MAX;
1076 cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
1078 for (i = 0; i < ARRAY_SIZE(ctx->acq); i++)
1079 INIT_LIST_HEAD(&ctx->acq[i]);
1081 sc->offchannel.chan.offchannel = true;
1084 void ath9k_init_channel_context(struct ath_softc *sc)
1086 INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
1088 setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
1090 setup_timer(&sc->sched.timer, ath_chanctx_timer,
1094 void ath9k_deinit_channel_context(struct ath_softc *sc)
1096 cancel_work_sync(&sc->chanctx_work);
1099 bool ath9k_is_chanctx_enabled(void)
1101 return (ath9k_use_chanctx == 1);
1104 /********************/
1105 /* Queue management */
1106 /********************/
1108 void ath9k_chanctx_wake_queues(struct ath_softc *sc)
1110 struct ath_hw *ah = sc->sc_ah;
1113 if (sc->cur_chan == &sc->offchannel.chan) {
1114 ieee80211_wake_queue(sc->hw,
1115 sc->hw->offchannel_tx_hw_queue);
1117 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1118 ieee80211_wake_queue(sc->hw,
1119 sc->cur_chan->hw_queue_base + i);
1122 if (ah->opmode == NL80211_IFTYPE_AP)
1123 ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
1130 static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
1132 struct ath_hw *ah = sc->sc_ah;
1133 s32 tsf, target_tsf;
1135 if (!avp || !avp->noa.has_next_tsf)
1138 ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
1140 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1142 target_tsf = avp->noa.next_tsf;
1143 if (!avp->noa.absent)
1144 target_tsf -= ATH_P2P_PS_STOP_TIME;
1146 if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
1147 target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
1149 ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, (u32) target_tsf, 1000000);
1152 static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
1154 struct ath_vif *avp = (void *)vif->drv_priv;
1157 if (!sc->p2p_ps_timer)
1160 if (vif->type != NL80211_IFTYPE_STATION || !vif->p2p)
1163 sc->p2p_ps_vif = avp;
1164 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1165 ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
1166 ath9k_update_p2p_ps_timer(sc, avp);
1169 static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
1171 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
1172 u8 switch_time, ctwin;
1175 * Channel switch in multi-channel mode is deferred
1176 * by a quarter beacon interval when handling
1177 * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
1178 * interface is guaranteed to be discoverable
1179 * for that duration after a TBTT.
1181 switch_time = cur_conf->beacon_interval / 4;
1183 ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
1184 if (ctwin && (ctwin < switch_time))
1187 if (switch_time < P2P_DEFAULT_CTWIN)
1190 return P2P_DEFAULT_CTWIN;
1193 void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
1194 struct sk_buff *skb)
1196 static const u8 noa_ie_hdr[] = {
1197 WLAN_EID_VENDOR_SPECIFIC, /* type */
1199 0x50, 0x6f, 0x9a, /* WFA OUI */
1200 0x09, /* P2P subtype */
1201 0x0c, /* Notice of Absence */
1202 0x00, /* LSB of little-endian len */
1203 0x00, /* MSB of little-endian len */
1206 struct ieee80211_p2p_noa_attr *noa;
1207 int noa_len, noa_desc, i = 0;
1210 if (!avp->offchannel_duration && !avp->periodic_noa_duration)
1213 noa_desc = !!avp->offchannel_duration + !!avp->periodic_noa_duration;
1214 noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
1216 hdr = skb_put(skb, sizeof(noa_ie_hdr));
1217 memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
1218 hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
1221 noa = (void *) skb_put(skb, noa_len);
1222 memset(noa, 0, noa_len);
1224 noa->index = avp->noa_index;
1225 noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
1227 if (avp->periodic_noa_duration) {
1228 u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
1230 noa->desc[i].count = 255;
1231 noa->desc[i].start_time = cpu_to_le32(avp->periodic_noa_start);
1232 noa->desc[i].duration = cpu_to_le32(avp->periodic_noa_duration);
1233 noa->desc[i].interval = cpu_to_le32(interval);
1237 if (avp->offchannel_duration) {
1238 noa->desc[i].count = 1;
1239 noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
1240 noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
1244 void ath9k_p2p_ps_timer(void *priv)
1246 struct ath_softc *sc = priv;
1247 struct ath_vif *avp = sc->p2p_ps_vif;
1248 struct ieee80211_vif *vif;
1249 struct ieee80211_sta *sta;
1250 struct ath_node *an;
1253 del_timer_sync(&sc->sched.timer);
1254 ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
1255 ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
1257 if (!avp || avp->chanctx != sc->cur_chan)
1260 tsf = ath9k_hw_gettsf32(sc->sc_ah);
1261 if (!avp->noa.absent)
1262 tsf += ATH_P2P_PS_STOP_TIME;
1264 if (!avp->noa.has_next_tsf ||
1265 avp->noa.next_tsf - tsf > BIT(31))
1266 ieee80211_update_p2p_noa(&avp->noa, tsf);
1268 ath9k_update_p2p_ps_timer(sc, avp);
1273 sta = ieee80211_find_sta(vif, vif->bss_conf.bssid);
1277 an = (void *) sta->drv_priv;
1278 if (an->sleeping == !!avp->noa.absent)
1281 an->sleeping = avp->noa.absent;
1283 ath_tx_aggr_sleep(sta, sc, an);
1285 ath_tx_aggr_wakeup(sc, an);
1291 void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
1292 struct ieee80211_vif *vif)
1294 unsigned long flags;
1296 spin_lock_bh(&sc->sc_pcu_lock);
1297 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1298 if (!(sc->ps_flags & PS_BEACON_SYNC))
1299 ath9k_update_p2p_ps(sc, vif);
1300 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1301 spin_unlock_bh(&sc->sc_pcu_lock);
1304 void ath9k_p2p_beacon_sync(struct ath_softc *sc)
1307 ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
1310 void ath9k_p2p_remove_vif(struct ath_softc *sc,
1311 struct ieee80211_vif *vif)
1313 struct ath_vif *avp = (void *)vif->drv_priv;
1315 spin_lock_bh(&sc->sc_pcu_lock);
1316 if (avp == sc->p2p_ps_vif) {
1317 sc->p2p_ps_vif = NULL;
1318 ath9k_update_p2p_ps_timer(sc, NULL);
1320 spin_unlock_bh(&sc->sc_pcu_lock);
1323 int ath9k_init_p2p(struct ath_softc *sc)
1325 sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
1326 NULL, sc, AR_FIRST_NDP_TIMER);
1327 if (!sc->p2p_ps_timer)
1333 void ath9k_deinit_p2p(struct ath_softc *sc)
1335 if (sc->p2p_ps_timer)
1336 ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
1339 #endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */