return 0;
}
-static bool
-ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
- bool powersave)
+void ath_chanctx_init(struct ath_softc *sc)
{
- 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;
+ 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;
- switch (vif->type) {
- case NL80211_IFTYPE_STATION:
- if (!vif->bss_conf.assoc)
- return false;
+ sband = &common->sbands[IEEE80211_BAND_2GHZ];
+ if (!sband->n_channels)
+ sband = &common->sbands[IEEE80211_BAND_5GHZ];
- skb = ieee80211_nullfunc_get(sc->hw, vif);
- if (!skb)
- return false;
+ 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]);
+ }
+}
- nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
- if (powersave)
- nullfunc->frame_control |=
- cpu_to_le16(IEEE80211_FCTL_PM);
+void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
+ struct cfg80211_chan_def *chandef)
+{
+ bool cur_chan;
- 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;
- }
+ 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);
- 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;
- }
+ if (!cur_chan)
+ return;
- return true;
+ ath_set_channel(sc);
+}
+
+#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
+
+/**********************************************************/
+/* Functions to handle the channel context state machine. */
+/**********************************************************/
+
+static const char *offchannel_state_string(enum ath_offchannel_state state)
+{
+#define case_rtn_string(val) case val: return #val
+
+ 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";
+ }
}
void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
}
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;
+ if (ath9k_is_chanctx_enabled()) {
+ ath_chanctx_event(sc, NULL,
+ ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
}
- rcu_read_unlock();
-
- return sent;
}
-static bool ath_chanctx_defer_switch(struct ath_softc *sc)
+static struct ath_chanctx *
+ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
{
- 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;
- }
+ int idx = ctx - &sc->chanctx[0];
- return true;
+ return &sc->chanctx[!idx];
}
-static void ath_chanctx_set_next(struct ath_softc *sc, bool force)
+static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
{
+ struct ath_chanctx *prev, *cur;
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);
+ u32 cur_tsf, prev_tsf, beacon_int;
+ s32 offset;
- if (sc->next_chan == &sc->offchannel.chan) {
- getrawmonotonic(&ts);
- measure_time = true;
- }
- __ath9k_flush(sc->hw, ~0, true);
+ beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
- if (ath_chanctx_send_ps_frame(sc, true))
- __ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO), false);
+ cur = sc->cur_chan;
+ prev = ath_chanctx_get_next(sc, cur);
- send_ps = true;
- spin_lock_bh(&sc->chan_lock);
+ getrawmonotonic(&ts);
+ cur_tsf = (u32) cur->tsf_val +
+ ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
- 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;
+ prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
+ prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
- spin_unlock_bh(&sc->chan_lock);
+ /* 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;
- 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);
+ /* Ignore stale data or spurious timestamps */
+ if (offset < 0 || offset > 3 * beacon_int)
+ return;
- ath_offchannel_channel_change(sc);
- ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
+ offset = beacon_int / 2 - (offset % beacon_int);
+ prev->tsf_val += offset;
}
-void ath_chanctx_work(struct work_struct *work)
+/* 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_softc *sc = container_of(work, struct ath_softc,
- chanctx_work);
- mutex_lock(&sc->mutex);
- ath_chanctx_set_next(sc, false);
- mutex_unlock(&sc->mutex);
+ struct ath_hw *ah = sc->sc_ah;
+
+#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
+ ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
+#endif
+ 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_init(struct ath_softc *sc)
+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;
- 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];
+ u32 tsf_time;
+ u32 beacon_int;
+ bool noa_changed = false;
- 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;
+ if (vif)
+ avp = (struct ath_vif *) vif->drv_priv;
-}
+ spin_lock_bh(&sc->chan_lock);
-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;
+ switch (ev) {
+ case ATH_CHANCTX_EVENT_BEACON_PREPARE:
+ if (avp->offchannel_duration)
+ avp->offchannel_duration = 0;
- if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
- return;
+ if (avp->chanctx != sc->cur_chan)
+ break;
- if (!avp->chanctx)
- return;
+ 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;
+ }
- 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;
- }
+ 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)
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, u32 ts,
+ enum ath_chanctx_event ev)
+{
+ sc->sched.next_tbtt = ts;
+ 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)) {
+ sc->sched.offchannel_pending = true;
+ spin_unlock_bh(&sc->chan_lock);
+ 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 =
+ TU_TO_USEC(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 to ATH_OFFCHANNEL_IDLE state, 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 to ATH_OFFCHANNEL_PROBE_SEND state, 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 = sc->offchannel.roc_duration;
+ sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
+ ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
+ } else {
+ 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)
+{
+ sc->offchannel.roc_vif = NULL;
+ sc->offchannel.roc_chan = NULL;
+ if (!abort)
+ 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);
+ 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,
+ 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 to ATH_OFFCHANNEL_PROBE_WAIT state\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;
+
+ 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: 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) {
+ 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:
+ ctx = ath_chanctx_get_oper_chan(sc, false);
+ sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
+ ath_chanctx_switch(sc, ctx, NULL);
+ 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 (!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;
+}
+
+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_offchannel_channel_change(struct ath_softc *sc)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+ ath_dbg(common, CHAN_CTX, "%s: 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 +
+ msecs_to_jiffies(sc->offchannel.duration));
+ ieee80211_ready_on_channel(sc->hw);
+ break;
+ case ATH_OFFCHANNEL_ROC_DONE:
+ ath_roc_complete(sc, false);
+ break;
+ default:
+ break;
+ }
+}
+
+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);
+}
+
+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);
+}
+
+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_wake_queues(struct ath_softc *sc)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ int i;
+
+ if (sc->cur_chan == &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,
+ sc->cur_chan->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);
+}
+
+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, vif->bss_conf.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 */
projects / cascardo / linux.git / blobdiff