diff options
Diffstat (limited to 'drivers/net/wireless/ath5k/base.c')
| -rw-r--r-- | drivers/net/wireless/ath5k/base.c | 79 |
1 files changed, 66 insertions, 13 deletions
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c index c49061c5168..eb98284cba9 100644 --- a/drivers/net/wireless/ath5k/base.c +++ b/drivers/net/wireless/ath5k/base.c @@ -1640,6 +1640,34 @@ ath5k_rx_decrypted(struct ath5k_softc *sc, struct ath5k_desc *ds, return 0; } + +static void +ath5k_check_ibss_hw_merge(struct ath5k_softc *sc, struct sk_buff *skb) +{ + u32 hw_tu; + struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data; + + if ((mgmt->frame_control & IEEE80211_FCTL_FTYPE) == + IEEE80211_FTYPE_MGMT && + (mgmt->frame_control & IEEE80211_FCTL_STYPE) == + IEEE80211_STYPE_BEACON && + mgmt->u.beacon.capab_info & WLAN_CAPABILITY_IBSS && + memcmp(mgmt->bssid, sc->ah->ah_bssid, ETH_ALEN) == 0) { + /* + * Received an IBSS beacon with the same BSSID. Hardware might + * have updated the TSF, check if we need to update timers. + */ + hw_tu = TSF_TO_TU(ath5k_hw_get_tsf64(sc->ah)); + if (hw_tu >= sc->nexttbtt) { + ath5k_beacon_update_timers(sc, + mgmt->u.beacon.timestamp); + ATH5K_DBG_UNLIMIT(sc, ATH5K_DEBUG_BEACON, + "detected HW merge from received beacon\n"); + } + } +} + + static void ath5k_tasklet_rx(unsigned long data) { @@ -1767,6 +1795,10 @@ accept: ath5k_debug_dump_skb(sc, skb, "RX ", 0); + /* check beacons in IBSS mode */ + if (sc->opmode == IEEE80211_IF_TYPE_IBSS) + ath5k_check_ibss_hw_merge(sc, skb); + __ieee80211_rx(sc->hw, skb, &rxs); sc->led_rxrate = ds->ds_rxstat.rs_rate; ath5k_led_event(sc, ATH_LED_RX); @@ -2057,6 +2089,8 @@ ath5k_beacon_update_timers(struct ath5k_softc *sc, u64 bc_tsf) } #undef FUDGE + sc->nexttbtt = nexttbtt; + intval |= AR5K_BEACON_ENA; ath5k_hw_init_beacon(ah, nexttbtt, intval); @@ -2084,16 +2118,19 @@ ath5k_beacon_update_timers(struct ath5k_softc *sc, u64 bc_tsf) } -/* - * Configure the beacon timers and interrupts based on the operating mode +/** + * ath5k_beacon_config - Configure the beacon queues and interrupts + * + * @sc: struct ath5k_softc pointer we are operating on * * When operating in station mode we want to receive a BMISS interrupt when we * stop seeing beacons from the AP we've associated with so we can look for * another AP to associate with. * - * In IBSS mode we need to configure the beacon timers and use a self-linked tx - * descriptor if possible. If the hardware cannot deal with that we enable SWBA - * interrupts to send the beacons from the interrupt handler. + * In IBSS mode we use a self-linked tx descriptor if possible. We enable SWBA + * interrupts to detect HW merges only. + * + * AP mode is missing. */ static void ath5k_beacon_config(struct ath5k_softc *sc) @@ -2107,17 +2144,17 @@ ath5k_beacon_config(struct ath5k_softc *sc) sc->imask |= AR5K_INT_BMISS; } else if (sc->opmode == IEEE80211_IF_TYPE_IBSS) { /* - * In IBSS mode enable the beacon timers but only enable SWBA - * interrupts if we need to manually prepare beacon frames. - * Otherwise we use a self-linked tx descriptor and let the - * hardware deal with things. In that case we have to load it + * In IBSS mode we use a self-linked tx descriptor and let the + * hardware send the beacons automatically. We have to load it * only once here. + * We use the SWBA interrupt only to keep track of the beacon + * timers in order to detect HW merges (automatic TSF updates). */ ath5k_beaconq_config(sc); - if (!ath5k_hw_hasveol(ah)) - sc->imask |= AR5K_INT_SWBA; - else + sc->imask |= AR5K_INT_SWBA; + + if (ath5k_hw_hasveol(ah)) ath5k_beacon_send(sc); } /* TODO else AP */ @@ -2320,8 +2357,24 @@ ath5k_intr(int irq, void *dev_id) * Handle beacon transmission directly; deferring * this is too slow to meet timing constraints * under load. + * + * In IBSS mode we use this interrupt just to + * keep track of the next TBTT (target beacon + * transmission time) in order to detect hardware + * merges (TSF updates). */ - ath5k_beacon_send(sc); + if (sc->opmode == IEEE80211_IF_TYPE_IBSS) { + /* XXX: only if VEOL suppported */ + u64 tsf = ath5k_hw_get_tsf64(ah); + sc->nexttbtt += sc->bintval; + ATH5K_DBG(sc, ATH5K_DEBUG_BEACON, + "SWBA nexttbtt: %x hw_tu: %x " + "TSF: %llx\n", + sc->nexttbtt, + TSF_TO_TU(tsf), tsf); + } else { + ath5k_beacon_send(sc); + } } if (status & AR5K_INT_RXEOL) { /* |