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ath9k: Fix IBSS joiner mode

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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@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2013-02-04 15:38:24 +05:30 committed by John W. Linville
parent dd5ee59bb0
commit 1a6404a1d8
3 changed files with 89 additions and 27 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -389,6 +389,7 @@ struct ath_beacon_config {
u16 bmiss_timeout;
u8 dtim_count;
bool enable_beacon;
bool ibss_creator;
};
struct ath_beacon {

113
drivers/net/wireless/ath/ath9k/beacon.c
View File

@ -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 {
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);
}
}
/*
* Configure the HW beacon registers only when we have a valid
* beacon interval.
*/
if (cur_conf->beacon_interval) {
/*
* Take care of multiple interfaces when
* enabling/disabling SWBA.
* 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_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) {
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);
}
}

2
drivers/net/wireless/ath/ath9k/recv.c
View File

@ -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);
}