ath9k: Add multi-channel scheduling support

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 7947909..0bc63bd 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -350,6 +350,10 @@ enum ath_chanctx_event {
        ATH_CHANCTX_EVENT_BEACON_SENT,
        ATH_CHANCTX_EVENT_TSF_TIMER,
        ATH_CHANCTX_EVENT_BEACON_RECEIVED,
+       ATH_CHANCTX_EVENT_ASSOC,
+       ATH_CHANCTX_EVENT_SWITCH,
+       ATH_CHANCTX_EVENT_UNASSIGN,
+       ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL,
 };
 
 enum ath_chanctx_state {
@@ -362,6 +366,7 @@ enum ath_chanctx_state {
 
 struct ath_chanctx_sched {
        bool beacon_pending;
+       bool offchannel_pending;
        enum ath_chanctx_state state;
 
        u32 next_tbtt;

diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
index 8d56b79..1cb2909 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -180,10 +180,13 @@ void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
                n_active++;
        }
 
-       if (n_active > 1)
-               set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
-       else
+       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
@@ -282,6 +285,7 @@ static void ath_chanctx_set_next(struct ath_softc *sc, bool force)
                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)
@@ -357,8 +361,17 @@ void ath9k_chanctx_force_active(struct ieee80211_hw *hw,
 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;
@@ -462,6 +475,7 @@ void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        struct ath_vif *avp = NULL;
+       struct ath_chanctx *ctx;
        u32 tsf_time;
        bool noa_changed = false;
 
@@ -475,6 +489,25 @@ void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
                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;
 
@@ -518,11 +551,65 @@ void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
                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))
+               if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
+                   sc->cur_chan == &sc->offchannel.chan)
                        break;
 
                ath_chanctx_adjust_tbtt_delta(sc);
                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);
+
+               sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
+               tsf_time = ath9k_hw_gettsf32(sc->sc_ah);
+               tsf_time +=
+                       TU_TO_USEC(sc->cur_chan->beacon.beacon_interval) / 2;
+               tsf_time -= sc->sched.channel_switch_time;
+               sc->sched.switch_start_time = tsf_time;
+
+               ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer,
+                                        tsf_time, 1000000);
+               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);

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index b8975f0..f7d8dda 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1747,6 +1747,8 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
                        bss_conf->bssid, bss_conf->assoc);
 
                ath9k_calculate_summary_state(sc, avp->chanctx);
+               if (bss_conf->assoc)
+                       ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_ASSOC);
        }
 
        if (changed & BSS_CHANGED_IBSS) {
@@ -2492,6 +2494,7 @@ static void ath9k_remove_chanctx(struct ieee80211_hw *hw,
 
        mutex_lock(&sc->mutex);
        ctx->assigned = false;
+       ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_UNASSIGN);
        mutex_unlock(&sc->mutex);
 }