diff options
author | Sujith Manoharan <c_manoha@qca.qualcomm.com> | 2013-02-04 10:08:24 (GMT) |
---|---|---|
committer | John W. Linville <linville@tuxdriver.com> | 2013-02-11 20:34:56 (GMT) |
commit | 1a6404a1d8497692f31808319d662c739033c491 (patch) | |
tree | 4e5c3664fc7e4d7bf41972836da4891c7fab026a /drivers/net/wireless/ath/ath9k/beacon.c | |
parent | dd5ee59bb005df38ca3ee00bc6ac349dc3370e4f (diff) | |
download | linux-1a6404a1d8497692f31808319d662c739033c491.tar.xz |
ath9k: Fix IBSS joiner mode
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>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/beacon.c')
-rw-r--r-- | drivers/net/wireless/ath/ath9k/beacon.c | 113 |
1 files changed, 87 insertions, 26 deletions
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); } } |