--- /dev/null
+/*
+ * 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(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[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;
+ ctx->flush_timeout = HZ / 5; /* 200ms */
+ for (j = 0; j < ARRAY_SIZE(ctx->acq); j++)
+ INIT_LIST_HEAD(&ctx->acq[j]);
+ }
+}
+
+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";
+ }
+}
+
+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 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);
+
+ if (!prev->switch_after_beacon)
+ return;
+
+ 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;
+}
+
+/* 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;
+
+ 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, jiffies + tsf_time);
+
+ ath_dbg(common, CHAN_CTX,
+ "Setup chanctx timer with timeout: %d ms\n", jiffies_to_msecs(tsf_time));
+}
+
+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: %d, 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: %d, 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: %d, 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\n",
+ sc->cur_chan->chandef.center_freq1,
+ chanctx_event_string(ev),
+ chanctx_state_string(sc->sched.state));
+
+ 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, bool abort)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+ if (abort)
+ ath_dbg(common, CHAN_CTX, "RoC aborted\n");
+ else
+ ath_dbg(common, CHAN_CTX, "RoC expired\n");
+
+ sc->offchannel.roc_vif = NULL;
+ sc->offchannel.roc_chan = NULL;
+ ieee80211_remain_on_channel_expired(sc->hw);
+ 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);
+
+ 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, abort);
+ 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)
+ memcpy(skb_put(skb, req->ie_len), 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];
+ txctl.force_channel = true;
+ 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(unsigned long data)
+{
+ struct ath_softc *sc = (struct ath_softc *) data;
+ 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(unsigned long data)
+{
+ struct ath_softc *sc = (struct ath_softc *)data;
+ 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, false);
+ 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);
+ 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;
+}
+
+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 timespec 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) {
+ getrawmonotonic(&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) {
+ getrawmonotonic(&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[IEEE80211_BAND_2GHZ];
+ if (!sband->n_channels)
+ sband = &common->sbands[IEEE80211_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]);
+
+ sc->offchannel.chan.offchannel = true;
+}
+
+void ath9k_init_channel_context(struct ath_softc *sc)
+{
+ INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
+
+ setup_timer(&sc->offchannel.timer, ath_offchannel_timer,
+ (unsigned long)sc);
+ setup_timer(&sc->sched.timer, ath_chanctx_timer,
+ (unsigned long)sc);
+
+ 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_hw *ah = sc->sc_ah;
+ s32 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;
+
+ if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
+ target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
+
+ ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, (u32) 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 || !vif->p2p)
+ return;
+
+ sc->p2p_ps_vif = avp;
+ 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(skb, sizeof(noa_ie_hdr));
+ memcpy(hdr, noa_ie_hdr, sizeof(noa_ie_hdr));
+ hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
+ hdr[7] = noa_len;
+
+ noa = (void *) skb_put(skb, noa_len);
+ memset(noa, 0, noa_len);
+
+ noa->index = avp->noa_index;
+ noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
+
+ 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;
+
+ 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);
+ if (!(sc->ps_flags & PS_BEACON_SYNC))
+ 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 */
Code Review / kvmfornfv.git / blobdiff