diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/channel.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/channel.c | 1651 |
1 files changed, 1651 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c new file mode 100644 index 000000000..fd61ae478 --- /dev/null +++ b/drivers/net/wireless/ath/ath9k/channel.c @@ -0,0 +1,1651 @@ +/* + * Copyright (c) 2014 Qualcomm Atheros, Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "ath9k.h" + +/* Set/change channels. If the channel is really being changed, it's done + * by reseting the chip. To accomplish this we must first cleanup any pending + * DMA, then restart stuff. + */ +static int ath_set_channel(struct ath_softc *sc) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ieee80211_hw *hw = sc->hw; + struct ath9k_channel *hchan; + struct cfg80211_chan_def *chandef = &sc->cur_chan->chandef; + struct ieee80211_channel *chan = chandef->chan; + int pos = chan->hw_value; + unsigned long flags; + int old_pos = -1; + int r; + + if (test_bit(ATH_OP_INVALID, &common->op_flags)) + return -EIO; + + if (ah->curchan) + old_pos = ah->curchan - &ah->channels[0]; + + ath_dbg(common, CONFIG, "Set channel: %d MHz width: %d\n", + chan->center_freq, chandef->width); + + /* update survey stats for the old channel before switching */ + spin_lock_irqsave(&common->cc_lock, flags); + ath_update_survey_stats(sc); + spin_unlock_irqrestore(&common->cc_lock, flags); + + ath9k_cmn_get_channel(hw, ah, chandef); + + /* If the operating channel changes, change the survey in-use flags + * along with it. + * Reset the survey data for the new channel, unless we're switching + * back to the operating channel from an off-channel operation. + */ + if (!sc->cur_chan->offchannel && sc->cur_survey != &sc->survey[pos]) { + if (sc->cur_survey) + sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE; + + sc->cur_survey = &sc->survey[pos]; + + memset(sc->cur_survey, 0, sizeof(struct survey_info)); + sc->cur_survey->filled |= SURVEY_INFO_IN_USE; + } else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) { + memset(&sc->survey[pos], 0, sizeof(struct survey_info)); + } + + hchan = &sc->sc_ah->channels[pos]; + r = ath_reset(sc, hchan); + if (r) + return r; + + /* The most recent snapshot of channel->noisefloor for the old + * channel is only available after the hardware reset. Copy it to + * the survey stats now. + */ + if (old_pos >= 0) + ath_update_survey_nf(sc, old_pos); + + /* Enable radar pulse detection if on a DFS channel. Spectral + * scanning and radar detection can not be used concurrently. + */ + if (hw->conf.radar_enabled) { + u32 rxfilter; + + rxfilter = ath9k_hw_getrxfilter(ah); + rxfilter |= ATH9K_RX_FILTER_PHYRADAR | + ATH9K_RX_FILTER_PHYERR; + ath9k_hw_setrxfilter(ah, rxfilter); + ath_dbg(common, DFS, "DFS enabled at freq %d\n", + chan->center_freq); + } else { + /* perform spectral scan if requested. */ + if (test_bit(ATH_OP_SCANNING, &common->op_flags) && + sc->spec_priv.spectral_mode == SPECTRAL_CHANSCAN) + ath9k_cmn_spectral_scan_trigger(common, &sc->spec_priv); + } + + return 0; +} + +void ath_chanctx_init(struct ath_softc *sc) +{ + struct ath_chanctx *ctx; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ieee80211_supported_band *sband; + struct ieee80211_channel *chan; + int i, j; + + sband = &common->sbands[NL80211_BAND_2GHZ]; + if (!sband->n_channels) + sband = &common->sbands[NL80211_BAND_5GHZ]; + + chan = &sband->channels[0]; + for (i = 0; i < ATH9K_NUM_CHANCTX; i++) { + ctx = &sc->chanctx[i]; + cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20); + INIT_LIST_HEAD(&ctx->vifs); + ctx->txpower = ATH_TXPOWER_MAX; + ctx->flush_timeout = HZ / 5; /* 200ms */ + for (j = 0; j < ARRAY_SIZE(ctx->acq); j++) { + INIT_LIST_HEAD(&ctx->acq[j].acq_new); + INIT_LIST_HEAD(&ctx->acq[j].acq_old); + spin_lock_init(&ctx->acq[j].lock); + } + } +} + +void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx, + struct cfg80211_chan_def *chandef) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + bool cur_chan; + + spin_lock_bh(&sc->chan_lock); + if (chandef) + memcpy(&ctx->chandef, chandef, sizeof(*chandef)); + cur_chan = sc->cur_chan == ctx; + spin_unlock_bh(&sc->chan_lock); + + if (!cur_chan) { + ath_dbg(common, CHAN_CTX, + "Current context differs from the new context\n"); + return; + } + + ath_set_channel(sc); +} + +#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT + +/*************/ +/* Utilities */ +/*************/ + +struct ath_chanctx* ath_is_go_chanctx_present(struct ath_softc *sc) +{ + struct ath_chanctx *ctx; + struct ath_vif *avp; + struct ieee80211_vif *vif; + + spin_lock_bh(&sc->chan_lock); + + ath_for_each_chanctx(sc, ctx) { + if (!ctx->active) + continue; + + list_for_each_entry(avp, &ctx->vifs, list) { + vif = avp->vif; + + if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO) { + spin_unlock_bh(&sc->chan_lock); + return ctx; + } + } + } + + spin_unlock_bh(&sc->chan_lock); + return NULL; +} + +/**********************************************************/ +/* Functions to handle the channel context state machine. */ +/**********************************************************/ + +static const char *offchannel_state_string(enum ath_offchannel_state state) +{ + switch (state) { + case_rtn_string(ATH_OFFCHANNEL_IDLE); + case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND); + case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT); + case_rtn_string(ATH_OFFCHANNEL_SUSPEND); + case_rtn_string(ATH_OFFCHANNEL_ROC_START); + case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT); + case_rtn_string(ATH_OFFCHANNEL_ROC_DONE); + default: + return "unknown"; + } +} + +static const char *chanctx_event_string(enum ath_chanctx_event ev) +{ + switch (ev) { + case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE); + case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT); + case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER); + case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED); + case_rtn_string(ATH_CHANCTX_EVENT_AUTHORIZED); + case_rtn_string(ATH_CHANCTX_EVENT_SWITCH); + case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN); + case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN); + case_rtn_string(ATH_CHANCTX_EVENT_CHANGE); + case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL); + default: + return "unknown"; + } +} + +static const char *chanctx_state_string(enum ath_chanctx_state state) +{ + switch (state) { + case_rtn_string(ATH_CHANCTX_STATE_IDLE); + case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON); + case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER); + case_rtn_string(ATH_CHANCTX_STATE_SWITCH); + case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE); + default: + return "unknown"; + } +} + +static u32 chanctx_event_delta(struct ath_softc *sc) +{ + u64 ms; + struct timespec64 ts, *old; + + ktime_get_raw_ts64(&ts); + old = &sc->last_event_time; + ms = ts.tv_sec * 1000 + ts.tv_nsec / 1000000; + ms -= old->tv_sec * 1000 + old->tv_nsec / 1000000; + sc->last_event_time = ts; + + return (u32)ms; +} + +void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_chanctx *ictx; + struct ath_vif *avp; + bool active = false; + u8 n_active = 0; + + if (!ctx) + return; + + if (ctx == &sc->offchannel.chan) { + spin_lock_bh(&sc->chan_lock); + + if (likely(sc->sched.channel_switch_time)) + ctx->flush_timeout = + usecs_to_jiffies(sc->sched.channel_switch_time); + else + ctx->flush_timeout = + msecs_to_jiffies(10); + + spin_unlock_bh(&sc->chan_lock); + + /* + * There is no need to iterate over the + * active/assigned channel contexts if + * the current context is offchannel. + */ + return; + } + + ictx = ctx; + + list_for_each_entry(avp, &ctx->vifs, list) { + struct ieee80211_vif *vif = avp->vif; + + switch (vif->type) { + case NL80211_IFTYPE_P2P_CLIENT: + case NL80211_IFTYPE_STATION: + if (avp->assoc) + active = true; + break; + default: + active = true; + break; + } + } + ctx->active = active; + + ath_for_each_chanctx(sc, ctx) { + if (!ctx->assigned || list_empty(&ctx->vifs)) + continue; + n_active++; + } + + spin_lock_bh(&sc->chan_lock); + + if (n_active <= 1) { + ictx->flush_timeout = HZ / 5; + clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags); + spin_unlock_bh(&sc->chan_lock); + return; + } + + ictx->flush_timeout = usecs_to_jiffies(sc->sched.channel_switch_time); + + if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) { + spin_unlock_bh(&sc->chan_lock); + return; + } + + spin_unlock_bh(&sc->chan_lock); + + if (ath9k_is_chanctx_enabled()) { + ath_chanctx_event(sc, NULL, + ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL); + } +} + +static struct ath_chanctx * +ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx) +{ + int idx = ctx - &sc->chanctx[0]; + + return &sc->chanctx[!idx]; +} + +static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc) +{ + struct ath_chanctx *prev, *cur; + struct timespec64 ts; + u32 cur_tsf, prev_tsf, beacon_int; + s32 offset; + + beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval); + + cur = sc->cur_chan; + prev = ath_chanctx_get_next(sc, cur); + + if (!prev->switch_after_beacon) + return; + + ktime_get_raw_ts64(&ts); + cur_tsf = (u32) cur->tsf_val + + ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts); + + prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf; + prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts); + + /* Adjust the TSF time of the AP chanctx to keep its beacons + * at half beacon interval offset relative to the STA chanctx. + */ + offset = cur_tsf - prev_tsf; + + /* Ignore stale data or spurious timestamps */ + if (offset < 0 || offset > 3 * beacon_int) + return; + + offset = beacon_int / 2 - (offset % beacon_int); + prev->tsf_val += offset; +} + +/* Configure the TSF based hardware timer for a channel switch. + * Also set up backup software timer, in case the gen timer fails. + * This could be caused by a hardware reset. + */ +static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_hw *ah = sc->sc_ah; + unsigned long timeout; + + ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000); + tsf_time -= ath9k_hw_gettsf32(ah); + timeout = msecs_to_jiffies(tsf_time / 1000) + 1; + mod_timer(&sc->sched.timer, jiffies + timeout); + + ath_dbg(common, CHAN_CTX, + "Setup chanctx timer with timeout: %d (%d) ms\n", + tsf_time / 1000, jiffies_to_msecs(timeout)); +} + +static void ath_chanctx_handle_bmiss(struct ath_softc *sc, + struct ath_chanctx *ctx, + struct ath_vif *avp) +{ + /* + * Clear the extend_absence flag if it had been + * set during the previous beacon transmission, + * since we need to revert to the normal NoA + * schedule. + */ + if (ctx->active && sc->sched.extend_absence) { + avp->noa_duration = 0; + sc->sched.extend_absence = false; + } + + /* If at least two consecutive beacons were missed on the STA + * chanctx, stay on the STA channel for one extra beacon period, + * to resync the timer properly. + */ + if (ctx->active && sc->sched.beacon_miss >= 2) { + avp->noa_duration = 0; + sc->sched.extend_absence = true; + } +} + +static void ath_chanctx_offchannel_noa(struct ath_softc *sc, + struct ath_chanctx *ctx, + struct ath_vif *avp, + u32 tsf_time) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + avp->noa_index++; + avp->offchannel_start = tsf_time; + avp->offchannel_duration = sc->sched.offchannel_duration; + + ath_dbg(common, CHAN_CTX, + "offchannel noa_duration: %d, noa_start: %u, noa_index: %d\n", + avp->offchannel_duration, + avp->offchannel_start, + avp->noa_index); + + /* + * When multiple contexts are active, the NoA + * has to be recalculated and advertised after + * an offchannel operation. + */ + if (ctx->active && avp->noa_duration) + avp->noa_duration = 0; +} + +static void ath_chanctx_set_periodic_noa(struct ath_softc *sc, + struct ath_vif *avp, + struct ath_beacon_config *cur_conf, + u32 tsf_time, + u32 beacon_int) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + avp->noa_index++; + avp->noa_start = tsf_time; + + if (sc->sched.extend_absence) + avp->noa_duration = (3 * beacon_int / 2) + + sc->sched.channel_switch_time; + else + avp->noa_duration = + TU_TO_USEC(cur_conf->beacon_interval) / 2 + + sc->sched.channel_switch_time; + + if (test_bit(ATH_OP_SCANNING, &common->op_flags) || + sc->sched.extend_absence) + avp->periodic_noa = false; + else + avp->periodic_noa = true; + + ath_dbg(common, CHAN_CTX, + "noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n", + avp->noa_duration, + avp->noa_start, + avp->noa_index, + avp->periodic_noa); +} + +static void ath_chanctx_set_oneshot_noa(struct ath_softc *sc, + struct ath_vif *avp, + u32 tsf_time, + u32 duration) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + avp->noa_index++; + avp->noa_start = tsf_time; + avp->periodic_noa = false; + avp->oneshot_noa = true; + avp->noa_duration = duration + sc->sched.channel_switch_time; + + ath_dbg(common, CHAN_CTX, + "oneshot noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n", + avp->noa_duration, + avp->noa_start, + avp->noa_index, + avp->periodic_noa); +} + +void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif, + enum ath_chanctx_event ev) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath_beacon_config *cur_conf; + struct ath_vif *avp = NULL; + struct ath_chanctx *ctx; + u32 tsf_time; + u32 beacon_int; + + if (vif) + avp = (struct ath_vif *) vif->drv_priv; + + spin_lock_bh(&sc->chan_lock); + + ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s, delta: %u ms\n", + sc->cur_chan->chandef.center_freq1, + chanctx_event_string(ev), + chanctx_state_string(sc->sched.state), + chanctx_event_delta(sc)); + + switch (ev) { + case ATH_CHANCTX_EVENT_BEACON_PREPARE: + if (avp->offchannel_duration) + avp->offchannel_duration = 0; + + if (avp->oneshot_noa) { + avp->noa_duration = 0; + avp->oneshot_noa = false; + + ath_dbg(common, CHAN_CTX, + "Clearing oneshot NoA\n"); + } + + if (avp->chanctx != sc->cur_chan) { + ath_dbg(common, CHAN_CTX, + "Contexts differ, not preparing beacon\n"); + break; + } + + if (sc->sched.offchannel_pending && !sc->sched.wait_switch) { + sc->sched.offchannel_pending = false; + sc->next_chan = &sc->offchannel.chan; + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; + ath_dbg(common, CHAN_CTX, + "Setting offchannel_pending to false\n"); + } + + ctx = ath_chanctx_get_next(sc, sc->cur_chan); + if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) { + sc->next_chan = ctx; + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; + ath_dbg(common, CHAN_CTX, + "Set next context, move chanctx state to WAIT_FOR_BEACON\n"); + } + + /* if the timer missed its window, use the next interval */ + if (sc->sched.state == ATH_CHANCTX_STATE_WAIT_FOR_TIMER) { + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; + ath_dbg(common, CHAN_CTX, + "Move chanctx state from WAIT_FOR_TIMER to WAIT_FOR_BEACON\n"); + } + + if (sc->sched.mgd_prepare_tx) + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; + + /* + * When a context becomes inactive, for example, + * disassociation of a station context, the NoA + * attribute needs to be removed from subsequent + * beacons. + */ + if (!ctx->active && avp->noa_duration && + sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) { + avp->noa_duration = 0; + avp->periodic_noa = false; + + ath_dbg(common, CHAN_CTX, + "Clearing NoA schedule\n"); + } + + if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) + break; + + ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr); + + sc->sched.beacon_pending = true; + sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER); + + cur_conf = &sc->cur_chan->beacon; + beacon_int = TU_TO_USEC(cur_conf->beacon_interval); + + /* defer channel switch by a quarter beacon interval */ + tsf_time = sc->sched.next_tbtt + beacon_int / 4; + sc->sched.switch_start_time = tsf_time; + sc->cur_chan->last_beacon = sc->sched.next_tbtt; + + /* + * If an offchannel switch is scheduled to happen after + * a beacon transmission, update the NoA with one-shot + * values and increment the index. + */ + if (sc->next_chan == &sc->offchannel.chan) { + ath_chanctx_offchannel_noa(sc, ctx, avp, tsf_time); + break; + } + + ath_chanctx_handle_bmiss(sc, ctx, avp); + + /* + * If a mgd_prepare_tx() has been called by mac80211, + * a one-shot NoA needs to be sent. This can happen + * with one or more active channel contexts - in both + * cases, a new NoA schedule has to be advertised. + */ + if (sc->sched.mgd_prepare_tx) { + ath_chanctx_set_oneshot_noa(sc, avp, tsf_time, + jiffies_to_usecs(HZ / 5)); + break; + } + + /* Prevent wrap-around issues */ + if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30)) + avp->noa_duration = 0; + + /* + * If multiple contexts are active, start periodic + * NoA and increment the index for the first + * announcement. + */ + if (ctx->active && + (!avp->noa_duration || sc->sched.force_noa_update)) + ath_chanctx_set_periodic_noa(sc, avp, cur_conf, + tsf_time, beacon_int); + + if (ctx->active && sc->sched.force_noa_update) + sc->sched.force_noa_update = false; + + break; + case ATH_CHANCTX_EVENT_BEACON_SENT: + if (!sc->sched.beacon_pending) { + ath_dbg(common, CHAN_CTX, + "No pending beacon\n"); + break; + } + + sc->sched.beacon_pending = false; + + if (sc->sched.mgd_prepare_tx) { + sc->sched.mgd_prepare_tx = false; + complete(&sc->go_beacon); + ath_dbg(common, CHAN_CTX, + "Beacon sent, complete go_beacon\n"); + break; + } + + if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) + break; + + ath_dbg(common, CHAN_CTX, + "Move chanctx state to WAIT_FOR_TIMER\n"); + + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER; + ath_chanctx_setup_timer(sc, sc->sched.switch_start_time); + break; + case ATH_CHANCTX_EVENT_TSF_TIMER: + if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER) + break; + + if (!sc->cur_chan->switch_after_beacon && + sc->sched.beacon_pending) + sc->sched.beacon_miss++; + + ath_dbg(common, CHAN_CTX, + "Move chanctx state to SWITCH\n"); + + sc->sched.state = ATH_CHANCTX_STATE_SWITCH; + ieee80211_queue_work(sc->hw, &sc->chanctx_work); + break; + case ATH_CHANCTX_EVENT_BEACON_RECEIVED: + if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) || + sc->cur_chan == &sc->offchannel.chan) + break; + + sc->sched.beacon_pending = false; + sc->sched.beacon_miss = 0; + + if (sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE || + !sc->sched.beacon_adjust || + !sc->cur_chan->tsf_val) + break; + + ath_chanctx_adjust_tbtt_delta(sc); + + /* TSF time might have been updated by the incoming beacon, + * need update the channel switch timer to reflect the change. + */ + tsf_time = sc->sched.switch_start_time; + tsf_time -= (u32) sc->cur_chan->tsf_val + + ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL); + tsf_time += ath9k_hw_gettsf32(ah); + + sc->sched.beacon_adjust = false; + ath_chanctx_setup_timer(sc, tsf_time); + break; + case ATH_CHANCTX_EVENT_AUTHORIZED: + if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE || + avp->chanctx != sc->cur_chan) + break; + + ath_dbg(common, CHAN_CTX, + "Move chanctx state from FORCE_ACTIVE to IDLE\n"); + + sc->sched.state = ATH_CHANCTX_STATE_IDLE; + /* fall through */ + case ATH_CHANCTX_EVENT_SWITCH: + if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) || + sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE || + sc->cur_chan->switch_after_beacon || + sc->cur_chan == &sc->offchannel.chan) + break; + + /* If this is a station chanctx, stay active for a half + * beacon period (minus channel switch time) + */ + sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan); + cur_conf = &sc->cur_chan->beacon; + + ath_dbg(common, CHAN_CTX, + "Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n"); + + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER; + sc->sched.wait_switch = false; + + tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2; + + if (sc->sched.extend_absence) { + sc->sched.beacon_miss = 0; + tsf_time *= 3; + } + + tsf_time -= sc->sched.channel_switch_time; + tsf_time += ath9k_hw_gettsf32(sc->sc_ah); + sc->sched.switch_start_time = tsf_time; + + ath_chanctx_setup_timer(sc, tsf_time); + sc->sched.beacon_pending = true; + sc->sched.beacon_adjust = true; + break; + case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL: + if (sc->cur_chan == &sc->offchannel.chan || + sc->cur_chan->switch_after_beacon) + break; + + sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan); + ieee80211_queue_work(sc->hw, &sc->chanctx_work); + break; + case ATH_CHANCTX_EVENT_UNASSIGN: + if (sc->cur_chan->assigned) { + if (sc->next_chan && !sc->next_chan->assigned && + sc->next_chan != &sc->offchannel.chan) + sc->sched.state = ATH_CHANCTX_STATE_IDLE; + break; + } + + ctx = ath_chanctx_get_next(sc, sc->cur_chan); + sc->sched.state = ATH_CHANCTX_STATE_IDLE; + if (!ctx->assigned) + break; + + sc->next_chan = ctx; + ieee80211_queue_work(sc->hw, &sc->chanctx_work); + break; + case ATH_CHANCTX_EVENT_ASSIGN: + break; + case ATH_CHANCTX_EVENT_CHANGE: + break; + } + + spin_unlock_bh(&sc->chan_lock); +} + +void ath_chanctx_beacon_sent_ev(struct ath_softc *sc, + enum ath_chanctx_event ev) +{ + if (sc->sched.beacon_pending) + ath_chanctx_event(sc, NULL, ev); +} + +void ath_chanctx_beacon_recv_ev(struct ath_softc *sc, + enum ath_chanctx_event ev) +{ + ath_chanctx_event(sc, NULL, ev); +} + +static int ath_scan_channel_duration(struct ath_softc *sc, + struct ieee80211_channel *chan) +{ + struct cfg80211_scan_request *req = sc->offchannel.scan_req; + + if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR)) + return (HZ / 9); /* ~110 ms */ + + return (HZ / 16); /* ~60 ms */ +} + +static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx, + struct cfg80211_chan_def *chandef) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + spin_lock_bh(&sc->chan_lock); + + if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) && + (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) { + if (chandef) + ctx->chandef = *chandef; + + sc->sched.offchannel_pending = true; + sc->sched.wait_switch = true; + sc->sched.offchannel_duration = + jiffies_to_usecs(sc->offchannel.duration) + + sc->sched.channel_switch_time; + + spin_unlock_bh(&sc->chan_lock); + ath_dbg(common, CHAN_CTX, + "Set offchannel_pending to true\n"); + return; + } + + sc->next_chan = ctx; + if (chandef) { + ctx->chandef = *chandef; + ath_dbg(common, CHAN_CTX, + "Assigned next_chan to %d MHz\n", chandef->center_freq1); + } + + if (sc->next_chan == &sc->offchannel.chan) { + sc->sched.offchannel_duration = + jiffies_to_usecs(sc->offchannel.duration) + + sc->sched.channel_switch_time; + + if (chandef) { + ath_dbg(common, CHAN_CTX, + "Offchannel duration for chan %d MHz : %u\n", + chandef->center_freq1, + sc->sched.offchannel_duration); + } + } + spin_unlock_bh(&sc->chan_lock); + ieee80211_queue_work(sc->hw, &sc->chanctx_work); +} + +static void ath_chanctx_offchan_switch(struct ath_softc *sc, + struct ieee80211_channel *chan) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct cfg80211_chan_def chandef; + + cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT); + ath_dbg(common, CHAN_CTX, + "Channel definition created: %d MHz\n", chandef.center_freq1); + + ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef); +} + +static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc, + bool active) +{ + struct ath_chanctx *ctx; + + ath_for_each_chanctx(sc, ctx) { + if (!ctx->assigned || list_empty(&ctx->vifs)) + continue; + if (active && !ctx->active) + continue; + + if (ctx->switch_after_beacon) + return ctx; + } + + return &sc->chanctx[0]; +} + +static void +ath_scan_next_channel(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct cfg80211_scan_request *req = sc->offchannel.scan_req; + struct ieee80211_channel *chan; + + if (sc->offchannel.scan_idx >= req->n_channels) { + ath_dbg(common, CHAN_CTX, + "Moving offchannel state to ATH_OFFCHANNEL_IDLE, " + "scan_idx: %d, n_channels: %d\n", + sc->offchannel.scan_idx, + req->n_channels); + + sc->offchannel.state = ATH_OFFCHANNEL_IDLE; + ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false), + NULL); + return; + } + + ath_dbg(common, CHAN_CTX, + "Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n", + sc->offchannel.scan_idx); + + chan = req->channels[sc->offchannel.scan_idx++]; + sc->offchannel.duration = ath_scan_channel_duration(sc, chan); + sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND; + + ath_chanctx_offchan_switch(sc, chan); +} + +void ath_offchannel_next(struct ath_softc *sc) +{ + struct ieee80211_vif *vif; + + if (sc->offchannel.scan_req) { + vif = sc->offchannel.scan_vif; + sc->offchannel.chan.txpower = vif->bss_conf.txpower; + ath_scan_next_channel(sc); + } else if (sc->offchannel.roc_vif) { + vif = sc->offchannel.roc_vif; + sc->offchannel.chan.txpower = vif->bss_conf.txpower; + sc->offchannel.duration = + msecs_to_jiffies(sc->offchannel.roc_duration); + sc->offchannel.state = ATH_OFFCHANNEL_ROC_START; + ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan); + } else { + spin_lock_bh(&sc->chan_lock); + sc->sched.offchannel_pending = false; + sc->sched.wait_switch = false; + spin_unlock_bh(&sc->chan_lock); + + ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false), + NULL); + sc->offchannel.state = ATH_OFFCHANNEL_IDLE; + if (sc->ps_idle) + ath_cancel_work(sc); + } +} + +void ath_roc_complete(struct ath_softc *sc, enum ath_roc_complete_reason reason) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + sc->offchannel.roc_vif = NULL; + sc->offchannel.roc_chan = NULL; + + switch (reason) { + case ATH_ROC_COMPLETE_ABORT: + ath_dbg(common, CHAN_CTX, "RoC aborted\n"); + ieee80211_remain_on_channel_expired(sc->hw); + break; + case ATH_ROC_COMPLETE_EXPIRE: + ath_dbg(common, CHAN_CTX, "RoC expired\n"); + ieee80211_remain_on_channel_expired(sc->hw); + break; + case ATH_ROC_COMPLETE_CANCEL: + ath_dbg(common, CHAN_CTX, "RoC canceled\n"); + break; + } + + ath_offchannel_next(sc); + ath9k_ps_restore(sc); +} + +void ath_scan_complete(struct ath_softc *sc, bool abort) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct cfg80211_scan_info info = { + .aborted = abort, + }; + + if (abort) + ath_dbg(common, CHAN_CTX, "HW scan aborted\n"); + else + ath_dbg(common, CHAN_CTX, "HW scan complete\n"); + + sc->offchannel.scan_req = NULL; + sc->offchannel.scan_vif = NULL; + sc->offchannel.state = ATH_OFFCHANNEL_IDLE; + ieee80211_scan_completed(sc->hw, &info); + clear_bit(ATH_OP_SCANNING, &common->op_flags); + spin_lock_bh(&sc->chan_lock); + if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) + sc->sched.force_noa_update = true; + spin_unlock_bh(&sc->chan_lock); + ath_offchannel_next(sc); + ath9k_ps_restore(sc); +} + +static void ath_scan_send_probe(struct ath_softc *sc, + struct cfg80211_ssid *ssid) +{ + struct cfg80211_scan_request *req = sc->offchannel.scan_req; + struct ieee80211_vif *vif = sc->offchannel.scan_vif; + struct ath_tx_control txctl = {}; + struct sk_buff *skb; + struct ieee80211_tx_info *info; + int band = sc->offchannel.chan.chandef.chan->band; + + skb = ieee80211_probereq_get(sc->hw, vif->addr, + ssid->ssid, ssid->ssid_len, req->ie_len); + if (!skb) + return; + + info = IEEE80211_SKB_CB(skb); + if (req->no_cck) + info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE; + + if (req->ie_len) + skb_put_data(skb, req->ie, req->ie_len); + + skb_set_queue_mapping(skb, IEEE80211_AC_VO); + + if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL)) + goto error; + + txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO]; + if (ath_tx_start(sc->hw, skb, &txctl)) + goto error; + + return; + +error: + ieee80211_free_txskb(sc->hw, skb); +} + +static void ath_scan_channel_start(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct cfg80211_scan_request *req = sc->offchannel.scan_req; + int i; + + if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) && + req->n_ssids) { + for (i = 0; i < req->n_ssids; i++) + ath_scan_send_probe(sc, &req->ssids[i]); + + } + + ath_dbg(common, CHAN_CTX, + "Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n"); + + sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT; + mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration); +} + +static void ath_chanctx_timer(struct timer_list *t) +{ + struct ath_softc *sc = from_timer(sc, t, sched.timer); + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + ath_dbg(common, CHAN_CTX, + "Channel context timer invoked\n"); + + ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER); +} + +static void ath_offchannel_timer(struct timer_list *t) +{ + struct ath_softc *sc = from_timer(sc, t, offchannel.timer); + struct ath_chanctx *ctx; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n", + __func__, offchannel_state_string(sc->offchannel.state)); + + switch (sc->offchannel.state) { + case ATH_OFFCHANNEL_PROBE_WAIT: + if (!sc->offchannel.scan_req) + return; + + /* get first active channel context */ + ctx = ath_chanctx_get_oper_chan(sc, true); + if (ctx->active) { + ath_dbg(common, CHAN_CTX, + "Switch to oper/active context, " + "move offchannel state to ATH_OFFCHANNEL_SUSPEND\n"); + + sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND; + ath_chanctx_switch(sc, ctx, NULL); + mod_timer(&sc->offchannel.timer, jiffies + HZ / 10); + break; + } + /* fall through */ + case ATH_OFFCHANNEL_SUSPEND: + if (!sc->offchannel.scan_req) + return; + + ath_scan_next_channel(sc); + break; + case ATH_OFFCHANNEL_ROC_START: + case ATH_OFFCHANNEL_ROC_WAIT: + sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE; + ath_roc_complete(sc, ATH_ROC_COMPLETE_EXPIRE); + break; + default: + break; + } +} + +static bool +ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp, + bool powersave) +{ + struct ieee80211_vif *vif = avp->vif; + struct ieee80211_sta *sta = NULL; + struct ieee80211_hdr_3addr *nullfunc; + struct ath_tx_control txctl; + struct sk_buff *skb; + int band = sc->cur_chan->chandef.chan->band; + + switch (vif->type) { + case NL80211_IFTYPE_STATION: + if (!avp->assoc) + return false; + + skb = ieee80211_nullfunc_get(sc->hw, vif, false); + if (!skb) + return false; + + nullfunc = (struct ieee80211_hdr_3addr *) skb->data; + if (powersave) + nullfunc->frame_control |= + cpu_to_le16(IEEE80211_FCTL_PM); + + skb->priority = 7; + skb_set_queue_mapping(skb, IEEE80211_AC_VO); + if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) { + dev_kfree_skb_any(skb); + return false; + } + break; + default: + return false; + } + + memset(&txctl, 0, sizeof(txctl)); + txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO]; + txctl.sta = sta; + if (ath_tx_start(sc->hw, skb, &txctl)) { + ieee80211_free_txskb(sc->hw, skb); + return false; + } + + return true; +} + +static bool +ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave) +{ + struct ath_vif *avp; + bool sent = false; + + rcu_read_lock(); + list_for_each_entry(avp, &sc->cur_chan->vifs, list) { + if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave)) + sent = true; + } + rcu_read_unlock(); + + return sent; +} + +static bool ath_chanctx_defer_switch(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + if (sc->cur_chan == &sc->offchannel.chan) + return false; + + switch (sc->sched.state) { + case ATH_CHANCTX_STATE_SWITCH: + return false; + case ATH_CHANCTX_STATE_IDLE: + if (!sc->cur_chan->switch_after_beacon) + return false; + + ath_dbg(common, CHAN_CTX, + "Defer switch, set chanctx state to WAIT_FOR_BEACON\n"); + + sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; + break; + default: + break; + } + + return true; +} + +static void ath_offchannel_channel_change(struct ath_softc *sc) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + + ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n", + __func__, offchannel_state_string(sc->offchannel.state)); + + switch (sc->offchannel.state) { + case ATH_OFFCHANNEL_PROBE_SEND: + if (!sc->offchannel.scan_req) + return; + + if (sc->cur_chan->chandef.chan != + sc->offchannel.chan.chandef.chan) + return; + + ath_scan_channel_start(sc); + break; + case ATH_OFFCHANNEL_IDLE: + if (!sc->offchannel.scan_req) + return; + + ath_scan_complete(sc, false); + break; + case ATH_OFFCHANNEL_ROC_START: + if (sc->cur_chan != &sc->offchannel.chan) + break; + + sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT; + mod_timer(&sc->offchannel.timer, + jiffies + sc->offchannel.duration); + ieee80211_ready_on_channel(sc->hw); + break; + case ATH_OFFCHANNEL_ROC_DONE: + break; + default: + break; + } +} + +void ath_chanctx_set_next(struct ath_softc *sc, bool force) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_chanctx *old_ctx; + struct timespec64 ts; + bool measure_time = false; + bool send_ps = false; + bool queues_stopped = false; + + spin_lock_bh(&sc->chan_lock); + if (!sc->next_chan) { + spin_unlock_bh(&sc->chan_lock); + return; + } + + if (!force && ath_chanctx_defer_switch(sc)) { + spin_unlock_bh(&sc->chan_lock); + return; + } + + ath_dbg(common, CHAN_CTX, + "%s: current: %d MHz, next: %d MHz\n", + __func__, + sc->cur_chan->chandef.center_freq1, + sc->next_chan->chandef.center_freq1); + + if (sc->cur_chan != sc->next_chan) { + ath_dbg(common, CHAN_CTX, + "Stopping current chanctx: %d\n", + sc->cur_chan->chandef.center_freq1); + sc->cur_chan->stopped = true; + spin_unlock_bh(&sc->chan_lock); + + if (sc->next_chan == &sc->offchannel.chan) { + ktime_get_raw_ts64(&ts); + measure_time = true; + } + + ath9k_chanctx_stop_queues(sc, sc->cur_chan); + queues_stopped = true; + + __ath9k_flush(sc->hw, ~0, true, false, false); + + if (ath_chanctx_send_ps_frame(sc, true)) + __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), + false, false, false); + + send_ps = true; + spin_lock_bh(&sc->chan_lock); + + if (sc->cur_chan != &sc->offchannel.chan) { + ktime_get_raw_ts64(&sc->cur_chan->tsf_ts); + sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah); + } + } + old_ctx = sc->cur_chan; + sc->cur_chan = sc->next_chan; + sc->cur_chan->stopped = false; + sc->next_chan = NULL; + + if (!sc->sched.offchannel_pending) + sc->sched.offchannel_duration = 0; + + if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE) + sc->sched.state = ATH_CHANCTX_STATE_IDLE; + + spin_unlock_bh(&sc->chan_lock); + + if (sc->sc_ah->chip_fullsleep || + memcmp(&sc->cur_chandef, &sc->cur_chan->chandef, + sizeof(sc->cur_chandef))) { + ath_dbg(common, CHAN_CTX, + "%s: Set channel %d MHz\n", + __func__, sc->cur_chan->chandef.center_freq1); + ath_set_channel(sc); + if (measure_time) + sc->sched.channel_switch_time = + ath9k_hw_get_tsf_offset(&ts, NULL); + /* + * A reset will ensure that all queues are woken up, + * so there is no need to awaken them again. + */ + goto out; + } + + if (queues_stopped) + ath9k_chanctx_wake_queues(sc, old_ctx); +out: + if (send_ps) + ath_chanctx_send_ps_frame(sc, false); + + ath_offchannel_channel_change(sc); + ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH); +} + +static void ath_chanctx_work(struct work_struct *work) +{ + struct ath_softc *sc = container_of(work, struct ath_softc, + chanctx_work); + mutex_lock(&sc->mutex); + ath_chanctx_set_next(sc, false); + mutex_unlock(&sc->mutex); +} + +void ath9k_offchannel_init(struct ath_softc *sc) +{ + struct ath_chanctx *ctx; + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ieee80211_supported_band *sband; + struct ieee80211_channel *chan; + int i; + + sband = &common->sbands[NL80211_BAND_2GHZ]; + if (!sband->n_channels) + sband = &common->sbands[NL80211_BAND_5GHZ]; + + chan = &sband->channels[0]; + + ctx = &sc->offchannel.chan; + INIT_LIST_HEAD(&ctx->vifs); + ctx->txpower = ATH_TXPOWER_MAX; + cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20); + + for (i = 0; i < ARRAY_SIZE(ctx->acq); i++) { + INIT_LIST_HEAD(&ctx->acq[i].acq_new); + INIT_LIST_HEAD(&ctx->acq[i].acq_old); + spin_lock_init(&ctx->acq[i].lock); + } + + sc->offchannel.chan.offchannel = true; +} + +void ath9k_init_channel_context(struct ath_softc *sc) +{ + INIT_WORK(&sc->chanctx_work, ath_chanctx_work); + + timer_setup(&sc->offchannel.timer, ath_offchannel_timer, 0); + timer_setup(&sc->sched.timer, ath_chanctx_timer, 0); + + init_completion(&sc->go_beacon); +} + +void ath9k_deinit_channel_context(struct ath_softc *sc) +{ + cancel_work_sync(&sc->chanctx_work); +} + +bool ath9k_is_chanctx_enabled(void) +{ + return (ath9k_use_chanctx == 1); +} + +/********************/ +/* Queue management */ +/********************/ + +void ath9k_chanctx_stop_queues(struct ath_softc *sc, struct ath_chanctx *ctx) +{ + struct ath_hw *ah = sc->sc_ah; + int i; + + if (ctx == &sc->offchannel.chan) { + ieee80211_stop_queue(sc->hw, + sc->hw->offchannel_tx_hw_queue); + } else { + for (i = 0; i < IEEE80211_NUM_ACS; i++) + ieee80211_stop_queue(sc->hw, + ctx->hw_queue_base + i); + } + + if (ah->opmode == NL80211_IFTYPE_AP) + ieee80211_stop_queue(sc->hw, sc->hw->queues - 2); +} + + +void ath9k_chanctx_wake_queues(struct ath_softc *sc, struct ath_chanctx *ctx) +{ + struct ath_hw *ah = sc->sc_ah; + int i; + + if (ctx == &sc->offchannel.chan) { + ieee80211_wake_queue(sc->hw, + sc->hw->offchannel_tx_hw_queue); + } else { + for (i = 0; i < IEEE80211_NUM_ACS; i++) + ieee80211_wake_queue(sc->hw, + ctx->hw_queue_base + i); + } + + if (ah->opmode == NL80211_IFTYPE_AP) + ieee80211_wake_queue(sc->hw, sc->hw->queues - 2); +} + +/*****************/ +/* P2P Powersave */ +/*****************/ + +static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp) +{ + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_hw *ah = sc->sc_ah; + u32 tsf, target_tsf; + + if (!avp || !avp->noa.has_next_tsf) + return; + + ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer); + + tsf = ath9k_hw_gettsf32(sc->sc_ah); + + target_tsf = avp->noa.next_tsf; + if (!avp->noa.absent) + target_tsf -= ATH_P2P_PS_STOP_TIME; + else + target_tsf += ATH_P2P_PS_STOP_TIME; + + if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME) + target_tsf = tsf + ATH_P2P_PS_STOP_TIME; + + ath_dbg(common, CHAN_CTX, "%s absent %d tsf 0x%08X next_tsf 0x%08X (%dms)\n", + __func__, avp->noa.absent, tsf, target_tsf, + (target_tsf - tsf) / 1000); + + ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, target_tsf, 1000000); +} + +static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif) +{ + struct ath_vif *avp = (void *)vif->drv_priv; + u32 tsf; + + if (!sc->p2p_ps_timer) + return; + + if (vif->type != NL80211_IFTYPE_STATION) + return; + + sc->p2p_ps_vif = avp; + + if (sc->ps_flags & PS_BEACON_SYNC) + return; + + tsf = ath9k_hw_gettsf32(sc->sc_ah); + ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf); + ath9k_update_p2p_ps_timer(sc, avp); +} + +static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp) +{ + struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon; + u8 switch_time, ctwin; + + /* + * Channel switch in multi-channel mode is deferred + * by a quarter beacon interval when handling + * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO + * interface is guaranteed to be discoverable + * for that duration after a TBTT. + */ + switch_time = cur_conf->beacon_interval / 4; + + ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow; + if (ctwin && (ctwin < switch_time)) + return ctwin; + + if (switch_time < P2P_DEFAULT_CTWIN) + return 0; + + return P2P_DEFAULT_CTWIN; +} + +void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp, + struct sk_buff *skb) +{ + static const u8 noa_ie_hdr[] = { + WLAN_EID_VENDOR_SPECIFIC, /* type */ + 0, /* length */ + 0x50, 0x6f, 0x9a, /* WFA OUI */ + 0x09, /* P2P subtype */ + 0x0c, /* Notice of Absence */ + 0x00, /* LSB of little-endian len */ + 0x00, /* MSB of little-endian len */ + }; + + struct ieee80211_p2p_noa_attr *noa; + int noa_len, noa_desc, i = 0; + u8 *hdr; + + if (!avp->offchannel_duration && !avp->noa_duration) + return; + + noa_desc = !!avp->offchannel_duration + !!avp->noa_duration; + noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc; + + hdr = skb_put_data(skb, noa_ie_hdr, sizeof(noa_ie_hdr)); + hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2; + hdr[7] = noa_len; + + noa = skb_put_zero(skb, noa_len); + + noa->index = avp->noa_index; + noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp); + if (noa->oppps_ctwindow) + noa->oppps_ctwindow |= BIT(7); + + if (avp->noa_duration) { + if (avp->periodic_noa) { + u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval); + noa->desc[i].count = 255; + noa->desc[i].interval = cpu_to_le32(interval); + } else { + noa->desc[i].count = 1; + } + + noa->desc[i].start_time = cpu_to_le32(avp->noa_start); + noa->desc[i].duration = cpu_to_le32(avp->noa_duration); + i++; + } + + if (avp->offchannel_duration) { + noa->desc[i].count = 1; + noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start); + noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration); + } +} + +void ath9k_p2p_ps_timer(void *priv) +{ + struct ath_softc *sc = priv; + struct ath_vif *avp = sc->p2p_ps_vif; + struct ieee80211_vif *vif; + struct ieee80211_sta *sta; + struct ath_node *an; + u32 tsf; + + del_timer_sync(&sc->sched.timer); + ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer); + ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER); + + if (!avp || avp->chanctx != sc->cur_chan) + return; + + tsf = ath9k_hw_gettsf32(sc->sc_ah); + if (!avp->noa.absent) + tsf += ATH_P2P_PS_STOP_TIME; + else + tsf -= ATH_P2P_PS_STOP_TIME; + + if (!avp->noa.has_next_tsf || + avp->noa.next_tsf - tsf > BIT(31)) + ieee80211_update_p2p_noa(&avp->noa, tsf); + + ath9k_update_p2p_ps_timer(sc, avp); + + rcu_read_lock(); + + vif = avp->vif; + sta = ieee80211_find_sta(vif, avp->bssid); + if (!sta) + goto out; + + an = (void *) sta->drv_priv; + if (an->sleeping == !!avp->noa.absent) + goto out; + + an->sleeping = avp->noa.absent; + if (an->sleeping) + ath_tx_aggr_sleep(sta, sc, an); + else + ath_tx_aggr_wakeup(sc, an); + +out: + rcu_read_unlock(); +} + +void ath9k_p2p_bss_info_changed(struct ath_softc *sc, + struct ieee80211_vif *vif) +{ + unsigned long flags; + + spin_lock_bh(&sc->sc_pcu_lock); + spin_lock_irqsave(&sc->sc_pm_lock, flags); + ath9k_update_p2p_ps(sc, vif); + spin_unlock_irqrestore(&sc->sc_pm_lock, flags); + spin_unlock_bh(&sc->sc_pcu_lock); +} + +void ath9k_p2p_beacon_sync(struct ath_softc *sc) +{ + if (sc->p2p_ps_vif) + ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif); +} + +void ath9k_p2p_remove_vif(struct ath_softc *sc, + struct ieee80211_vif *vif) +{ + struct ath_vif *avp = (void *)vif->drv_priv; + + spin_lock_bh(&sc->sc_pcu_lock); + if (avp == sc->p2p_ps_vif) { + sc->p2p_ps_vif = NULL; + ath9k_update_p2p_ps_timer(sc, NULL); + } + spin_unlock_bh(&sc->sc_pcu_lock); +} + +int ath9k_init_p2p(struct ath_softc *sc) +{ + sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer, + NULL, sc, AR_FIRST_NDP_TIMER); + if (!sc->p2p_ps_timer) + return -ENOMEM; + + return 0; +} + +void ath9k_deinit_p2p(struct ath_softc *sc) +{ + if (sc->p2p_ps_timer) + ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer); +} + +#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */ |