From: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
On joining an existing IBSS network, beaconing has to start
only after a TSF sync has happened by receiving a beacon from
the BSS. In creator mode, beaconing can start immediately after
a HW reset has been done.
Now that mac80211 notifies the driver of the mode type (creator/joiner)
via ieee80211_bss_conf->ibss_creator, make use of it to properly setup
the HW beacon timers.
Signed-off-by: Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 1 +
drivers/net/wireless/ath/ath9k/beacon.c | 113 ++++++++++++++++++++++++--------
drivers/net/wireless/ath/ath9k/recv.c | 2 +-
3 files changed, 89 insertions(+), 27 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 97c90b2..a56b241 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -389,6 +389,7 @@ struct ath_beacon_config {
u16 bmiss_timeout;
u8 dtim_count;
bool enable_beacon;
+ bool ibss_creator;
};
struct ath_beacon {
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index dd37719..5f05c26 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -407,12 +407,17 @@ void ath9k_beacon_tasklet(unsigned long data)
}
}
-static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt, u32 intval)
+/*
+ * Both nexttbtt and intval have to be in usecs.
+ */
+static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
+ u32 intval, bool reset_tsf)
{
struct ath_hw *ah = sc->sc_ah;
ath9k_hw_disable_interrupts(ah);
- ath9k_hw_reset_tsf(ah);
+ if (reset_tsf)
+ ath9k_hw_reset_tsf(ah);
ath9k_beaconq_config(sc);
ath9k_hw_beaconinit(ah, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
@@ -442,10 +447,12 @@ static void ath9k_beacon_config_ap(struct ath_softc *sc,
else
ah->imask &= ~ATH9K_INT_SWBA;
- ath_dbg(common, BEACON, "AP nexttbtt: %u intval: %u conf_intval: %u\n",
+ ath_dbg(common, BEACON,
+ "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
+ (conf->enable_beacon) ? "Enable" : "Disable",
nexttbtt, intval, conf->beacon_interval);
- ath9k_beacon_init(sc, nexttbtt, intval);
+ ath9k_beacon_init(sc, nexttbtt, intval, true);
}
/*
@@ -586,17 +593,45 @@ static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
ath9k_reset_beacon_status(sc);
intval = TU_TO_USEC(conf->beacon_interval);
- nexttbtt = intval;
+
+ if (conf->ibss_creator) {
+ nexttbtt = intval;
+ } else {
+ u32 tbtt, offset, tsftu;
+ u64 tsf;
+
+ /*
+ * Pull nexttbtt forward to reflect the current
+ * sync'd TSF.
+ */
+ tsf = ath9k_hw_gettsf64(ah);
+ tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
+ offset = tsftu % conf->beacon_interval;
+ tbtt = tsftu - offset;
+ if (offset)
+ tbtt += conf->beacon_interval;
+
+ nexttbtt = TU_TO_USEC(tbtt);
+ }
if (conf->enable_beacon)
ah->imask |= ATH9K_INT_SWBA;
else
ah->imask &= ~ATH9K_INT_SWBA;
- ath_dbg(common, BEACON, "IBSS nexttbtt: %u intval: %u conf_intval: %u\n",
+ ath_dbg(common, BEACON,
+ "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
+ (conf->enable_beacon) ? "Enable" : "Disable",
nexttbtt, intval, conf->beacon_interval);
- ath9k_beacon_init(sc, nexttbtt, intval);
+ ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator);
+
+ /*
+ * Set the global 'beacon has been configured' flag for the
+ * joiner case in IBSS mode.
+ */
+ if (!conf->ibss_creator && conf->enable_beacon)
+ set_bit(SC_OP_BEACONS, &sc->sc_flags);
}
bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
@@ -639,6 +674,7 @@ static void ath9k_cache_beacon_config(struct ath_softc *sc,
cur_conf->dtim_period = bss_conf->dtim_period;
cur_conf->listen_interval = 1;
cur_conf->dtim_count = 1;
+ cur_conf->ibss_creator = bss_conf->ibss_creator;
cur_conf->bmiss_timeout =
ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
@@ -666,34 +702,59 @@ void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
{
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
+ unsigned long flags;
+ bool skip_beacon = false;
if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
ath9k_cache_beacon_config(sc, bss_conf);
ath9k_set_beacon(sc);
set_bit(SC_OP_BEACONS, &sc->sc_flags);
- } else {
- /*
- * Take care of multiple interfaces when
- * enabling/disabling SWBA.
- */
- if (changed & BSS_CHANGED_BEACON_ENABLED) {
- if (!bss_conf->enable_beacon &&
- (sc->nbcnvifs <= 1)) {
- cur_conf->enable_beacon = false;
- } else if (bss_conf->enable_beacon) {
- cur_conf->enable_beacon = true;
- ath9k_cache_beacon_config(sc, bss_conf);
- }
+ return;
+
+ }
+
+ /*
+ * Take care of multiple interfaces when
+ * enabling/disabling SWBA.
+ */
+ if (changed & BSS_CHANGED_BEACON_ENABLED) {
+ if (!bss_conf->enable_beacon &&
+ (sc->nbcnvifs <= 1)) {
+ cur_conf->enable_beacon = false;
+ } else if (bss_conf->enable_beacon) {
+ cur_conf->enable_beacon = true;
+ ath9k_cache_beacon_config(sc, bss_conf);
}
+ }
- if (cur_conf->beacon_interval) {
+ /*
+ * Configure the HW beacon registers only when we have a valid
+ * beacon interval.
+ */
+ if (cur_conf->beacon_interval) {
+ /*
+ * If we are joining an existing IBSS network, start beaconing
+ * only after a TSF-sync has taken place. Ensure that this
+ * happens by setting the appropriate flags.
+ */
+ if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
+ bss_conf->enable_beacon) {
+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
+ sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+ skip_beacon = true;
+ } else {
ath9k_set_beacon(sc);
-
- if (cur_conf->enable_beacon)
- set_bit(SC_OP_BEACONS, &sc->sc_flags);
- else
- clear_bit(SC_OP_BEACONS, &sc->sc_flags);
}
+
+ /*
+ * Do not set the SC_OP_BEACONS flag for IBSS joiner mode
+ * here, it is done in ath9k_beacon_config_adhoc().
+ */
+ if (cur_conf->enable_beacon && !skip_beacon)
+ set_bit(SC_OP_BEACONS, &sc->sc_flags);
+ else
+ clear_bit(SC_OP_BEACONS, &sc->sc_flags);
}
}
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 2d0fd17..ee156e5 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -533,7 +533,7 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
if (sc->ps_flags & PS_BEACON_SYNC) {
sc->ps_flags &= ~PS_BEACON_SYNC;
ath_dbg(common, PS,
- "Reconfigure Beacon timers based on timestamp from the AP\n");
+ "Reconfigure beacon timers based on synchronized timestamp\n");
ath9k_set_beacon(sc);
}
--
1.8.1.2
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