| /* |
| * 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; |
| 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_bh(&common->cc_lock); |
| ath_update_survey_stats(sc); |
| spin_unlock_bh(&common->cc_lock); |
| |
| 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_internal(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; |
| |
| /* set HW specific DFS configuration */ |
| ath9k_hw_set_radar_params(ah); |
| 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->spectral_mode == SPECTRAL_CHANSCAN) |
| ath9k_spectral_scan_trigger(hw); |
| } |
| |
| return 0; |
| } |
| |
| 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 (!vif->bss_conf.assoc) |
| return false; |
| |
| skb = ieee80211_nullfunc_get(sc->hw, vif); |
| if (!skb) |
| return false; |
| |
| nullfunc = (struct ieee80211_hdr_3addr *) skb->data; |
| if (powersave) |
| nullfunc->frame_control |= |
| cpu_to_le16(IEEE80211_FCTL_PM); |
| |
| 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; |
| txctl.force_channel = true; |
| if (ath_tx_start(sc->hw, skb, &txctl)) { |
| ieee80211_free_txskb(sc->hw, skb); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| 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_vif *avp; |
| bool active = false; |
| u8 n_active = 0; |
| |
| if (!ctx) |
| return; |
| |
| 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 (vif->bss_conf.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++; |
| } |
| |
| if (n_active <= 1) { |
| clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags); |
| return; |
| } |
| if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) |
| return; |
| ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL); |
| } |
| |
| 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) |
| { |
| 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; |
| |
| sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; |
| break; |
| default: |
| break; |
| } |
| |
| return true; |
| } |
| |
| static void ath_chanctx_set_next(struct ath_softc *sc, bool force) |
| { |
| struct timespec ts; |
| bool measure_time = false; |
| bool send_ps = 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; |
| } |
| |
| if (sc->cur_chan != sc->next_chan) { |
| sc->cur_chan->stopped = true; |
| spin_unlock_bh(&sc->chan_lock); |
| |
| if (sc->next_chan == &sc->offchannel.chan) { |
| getrawmonotonic(&ts); |
| measure_time = true; |
| } |
| __ath9k_flush(sc->hw, ~0, true); |
| |
| if (ath_chanctx_send_ps_frame(sc, true)) |
| __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false); |
| |
| send_ps = true; |
| spin_lock_bh(&sc->chan_lock); |
| |
| if (sc->cur_chan != &sc->offchannel.chan) { |
| getrawmonotonic(&sc->cur_chan->tsf_ts); |
| sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah); |
| } |
| } |
| sc->cur_chan = sc->next_chan; |
| sc->cur_chan->stopped = false; |
| sc->next_chan = NULL; |
| 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_set_channel(sc); |
| if (measure_time) |
| sc->sched.channel_switch_time = |
| ath9k_hw_get_tsf_offset(&ts, NULL); |
| } |
| if (send_ps) |
| ath_chanctx_send_ps_frame(sc, false); |
| |
| ath_offchannel_channel_change(sc); |
| ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH); |
| } |
| |
| 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 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[IEEE80211_BAND_2GHZ]; |
| if (!sband->n_channels) |
| sband = &common->sbands[IEEE80211_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; |
| for (j = 0; j < ARRAY_SIZE(ctx->acq); j++) |
| INIT_LIST_HEAD(&ctx->acq[j]); |
| } |
| ctx = &sc->offchannel.chan; |
| cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20); |
| INIT_LIST_HEAD(&ctx->vifs); |
| ctx->txpower = ATH_TXPOWER_MAX; |
| for (j = 0; j < ARRAY_SIZE(ctx->acq); j++) |
| INIT_LIST_HEAD(&ctx->acq[j]); |
| sc->offchannel.chan.offchannel = true; |
| |
| } |
| |
| void ath9k_chanctx_force_active(struct ieee80211_hw *hw, |
| struct ieee80211_vif *vif) |
| { |
| struct ath_softc *sc = hw->priv; |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| struct ath_vif *avp = (struct ath_vif *) vif->drv_priv; |
| bool changed = false; |
| |
| if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) |
| return; |
| |
| if (!avp->chanctx) |
| return; |
| |
| mutex_lock(&sc->mutex); |
| |
| spin_lock_bh(&sc->chan_lock); |
| if (sc->next_chan || (sc->cur_chan != avp->chanctx)) { |
| sc->next_chan = avp->chanctx; |
| changed = true; |
| } |
| sc->sched.state = ATH_CHANCTX_STATE_FORCE_ACTIVE; |
| spin_unlock_bh(&sc->chan_lock); |
| |
| if (changed) |
| ath_chanctx_set_next(sc, true); |
| |
| mutex_unlock(&sc->mutex); |
| } |
| |
| 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)) { |
| sc->sched.offchannel_pending = true; |
| spin_unlock_bh(&sc->chan_lock); |
| return; |
| } |
| |
| sc->next_chan = ctx; |
| if (chandef) |
| ctx->chandef = *chandef; |
| |
| if (sc->next_chan == &sc->offchannel.chan) { |
| sc->sched.offchannel_duration = |
| TU_TO_USEC(sc->offchannel.duration) + |
| sc->sched.channel_switch_time; |
| } |
| spin_unlock_bh(&sc->chan_lock); |
| ieee80211_queue_work(sc->hw, &sc->chanctx_work); |
| } |
| |
| void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx, |
| struct cfg80211_chan_def *chandef) |
| { |
| 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) |
| return; |
| |
| ath_set_channel(sc); |
| } |
| |
| 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]; |
| } |
| |
| void ath_chanctx_offchan_switch(struct ath_softc *sc, |
| struct ieee80211_channel *chan) |
| { |
| struct cfg80211_chan_def chandef; |
| |
| cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT); |
| |
| ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef); |
| } |
| |
| 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 timespec 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); |
| |
| getrawmonotonic(&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; |
| } |
| |
| void ath_chanctx_timer(unsigned long data) |
| { |
| struct ath_softc *sc = (struct ath_softc *) data; |
| |
| ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER); |
| } |
| |
| /* 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_hw *ah = sc->sc_ah; |
| |
| ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000); |
| tsf_time -= ath9k_hw_gettsf32(ah); |
| tsf_time = msecs_to_jiffies(tsf_time / 1000) + 1; |
| mod_timer(&sc->sched.timer, tsf_time); |
| } |
| |
| 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; |
| bool noa_changed = false; |
| |
| if (vif) |
| avp = (struct ath_vif *) vif->drv_priv; |
| |
| spin_lock_bh(&sc->chan_lock); |
| |
| switch (ev) { |
| case ATH_CHANCTX_EVENT_BEACON_PREPARE: |
| if (avp->offchannel_duration) |
| avp->offchannel_duration = 0; |
| |
| if (avp->chanctx != sc->cur_chan) |
| break; |
| |
| if (sc->sched.offchannel_pending) { |
| sc->sched.offchannel_pending = false; |
| sc->next_chan = &sc->offchannel.chan; |
| sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON; |
| } |
| |
| 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; |
| } |
| |
| /* 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; |
| |
| if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) |
| break; |
| |
| 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; |
| |
| /* Prevent wrap-around issues */ |
| if (avp->periodic_noa_duration && |
| tsf_time - avp->periodic_noa_start > BIT(30)) |
| avp->periodic_noa_duration = 0; |
| |
| if (ctx->active && !avp->periodic_noa_duration) { |
| avp->periodic_noa_start = tsf_time; |
| avp->periodic_noa_duration = |
| TU_TO_USEC(cur_conf->beacon_interval) / 2 - |
| sc->sched.channel_switch_time; |
| noa_changed = true; |
| } else if (!ctx->active && avp->periodic_noa_duration) { |
| avp->periodic_noa_duration = 0; |
| noa_changed = true; |
| } |
| |
| /* 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) |
| sc->sched.offchannel_duration = 3 * beacon_int / 2; |
| |
| if (sc->sched.offchannel_duration) { |
| noa_changed = true; |
| avp->offchannel_start = tsf_time; |
| avp->offchannel_duration = |
| sc->sched.offchannel_duration; |
| } |
| |
| if (noa_changed) |
| avp->noa_index++; |
| break; |
| case ATH_CHANCTX_EVENT_BEACON_SENT: |
| if (!sc->sched.beacon_pending) |
| break; |
| |
| sc->sched.beacon_pending = false; |
| if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) |
| break; |
| |
| 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++; |
| |
| 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; |
| |
| ath_chanctx_adjust_tbtt_delta(sc); |
| sc->sched.beacon_pending = false; |
| sc->sched.beacon_miss = 0; |
| |
| /* 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); |
| |
| |
| ath_chanctx_setup_timer(sc, tsf_time); |
| break; |
| case ATH_CHANCTX_EVENT_ASSOC: |
| if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE || |
| avp->chanctx != sc->cur_chan) |
| break; |
| |
| 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; |
| |
| sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER; |
| |
| tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2; |
| if (sc->sched.beacon_miss >= 2) { |
| 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; |
| 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; |
| } |
| |
| spin_unlock_bh(&sc->chan_lock); |
| } |