static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
u32 intval, nexttbtt;
ath9k_reset_beacon_status(sc);
intval = TU_TO_USEC(conf->beacon_interval);
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 (%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, 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);
}
/*
* Associates the beacon frame buffer with a transmit descriptor. Will set
* up rate codes, and channel flags. Beacons are always sent out at the
* lowest rate, and are not retried.
*/
static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
struct ath_buf *bf, int rateidx)
{
struct sk_buff *skb = bf->bf_mpdu;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_desc *ds;
struct ath9k_11n_rate_series series[4];
int flags, ctsrate = 0, ctsduration = 0;
struct ieee80211_supported_band *sband;
u8 rate = 0;
ath9k_reset_beacon_status(sc);
ds = bf->bf_desc;
flags = ATH9K_TXDESC_NOACK;
ds->ds_link = 0;
sband = &sc->sbands[common->hw->conf.channel->band];
rate = sband->bitrates[rateidx].hw_value;
if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
rate |= sband->bitrates[rateidx].hw_value_short;
ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
ATH9K_PKT_TYPE_BEACON,
MAX_RATE_POWER,
ATH9K_TXKEYIX_INVALID,
ATH9K_KEY_TYPE_CLEAR,
flags);
/* NB: beacon's BufLen must be a multiple of 4 bytes */
ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
true, true, ds, bf->bf_buf_addr,
sc->beacon.beaconq);
memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
series[0].Tries = 1;
series[0].Rate = rate;
series[0].ChSel = ath_txchainmask_reduction(sc,
common->tx_chainmask, series[0].Rate);
series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
series, 4, 0);
}
/*
* Associates the beacon frame buffer with a transmit descriptor. Will set
* up rate codes, and channel flags. Beacons are always sent out at the
* lowest rate, and are not retried.
*/
static void ath_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
struct ath_buf *bf, int rateidx)
{
struct sk_buff *skb = bf->bf_mpdu;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_tx_info info;
struct ieee80211_supported_band *sband;
u8 chainmask = ah->txchainmask;
u8 rate = 0;
ath9k_reset_beacon_status(sc);
sband = &sc->sbands[common->hw->conf.channel->band];
rate = sband->bitrates[rateidx].hw_value;
if (vif->bss_conf.use_short_preamble)
rate |= sband->bitrates[rateidx].hw_value_short;
memset(&info, 0, sizeof(info));
info.pkt_len = skb->len + FCS_LEN;
info.type = ATH9K_PKT_TYPE_BEACON;
info.txpower = MAX_RATE_POWER;
info.keyix = ATH9K_TXKEYIX_INVALID;
info.keytype = ATH9K_KEY_TYPE_CLEAR;
info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
info.buf_addr[0] = bf->bf_buf_addr;
info.buf_len[0] = roundup(skb->len, 4);
info.is_first = true;
info.is_last = true;
info.qcu = sc->beacon.beaconq;
info.rates[0].Tries = 1;
info.rates[0].Rate = rate;
info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
}
static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
u32 intval, nexttbtt;
ath9k_reset_beacon_status(sc);
intval = TU_TO_USEC(conf->beacon_interval);
nexttbtt = intval;
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",
nexttbtt, intval, conf->beacon_interval);
ath9k_beacon_init(sc, nexttbtt, intval);
}
static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ath_softc *sc = hw->priv;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_buf *bf;
struct ath_vif *avp;
struct sk_buff *skb;
struct ath_txq *cabq;
struct ieee80211_tx_info *info;
int cabq_depth;
ath9k_reset_beacon_status(sc);
avp = (void *)vif->drv_priv;
cabq = sc->beacon.cabq;
if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
return NULL;
/* Release the old beacon first */
bf = avp->av_bcbuf;
skb = bf->bf_mpdu;
if (skb) {
dma_unmap_single(sc->dev, bf->bf_buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
bf->bf_buf_addr = 0;
}
/* Get a new beacon from mac80211 */
skb = ieee80211_beacon_get(hw, vif);
bf->bf_mpdu = skb;
if (skb == NULL)
return NULL;
((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
avp->tsf_adjust;
info = IEEE80211_SKB_CB(skb);
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
/*
* TODO: make sure the seq# gets assigned properly (vs. other
* TX frames)
*/
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
sc->tx.seq_no += 0x10;
hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
}
bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
skb->len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
dev_kfree_skb_any(skb);
bf->bf_mpdu = NULL;
bf->bf_buf_addr = 0;
ath_err(common, "dma_mapping_error on beaconing\n");
return NULL;
}
skb = ieee80211_get_buffered_bc(hw, vif);
/*
* if the CABQ traffic from previous DTIM is pending and the current
* beacon is also a DTIM.
* 1) if there is only one vif let the cab traffic continue.
* 2) if there are more than one vif and we are using staggered
* beacons, then drain the cabq by dropping all the frames in
* the cabq so that the current vifs cab traffic can be scheduled.
*/
spin_lock_bh(&cabq->axq_lock);
cabq_depth = cabq->axq_depth;
spin_unlock_bh(&cabq->axq_lock);
if (skb && cabq_depth) {
if (sc->nvifs > 1) {
ath_dbg(common, BEACON,
"Flushing previous cabq traffic\n");
ath_draintxq(sc, cabq, false);
}
}
ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
while (skb) {
ath_tx_cabq(hw, skb);
skb = ieee80211_get_buffered_bc(hw, vif);
}
return bf;
}
void ath9k_beacon_tasklet(unsigned long data)
{
struct ath_softc *sc = (struct ath_softc *)data;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_buf *bf = NULL;
struct ieee80211_vif *vif;
bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
int slot;
if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) {
ath_dbg(common, RESET,
"reset work is pending, skip beaconing now\n");
return;
}
/*
* Check if the previous beacon has gone out. If
* not don't try to post another, skip this period
* and wait for the next. Missed beacons indicate
* a problem and should not occur. If we miss too
* many consecutive beacons reset the device.
*/
if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
sc->beacon.bmisscnt++;
if (!ath9k_hw_check_alive(ah))
ieee80211_queue_work(sc->hw, &sc->hw_check_work);
if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
ath_dbg(common, BSTUCK,
"missed %u consecutive beacons\n",
sc->beacon.bmisscnt);
ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
if (sc->beacon.bmisscnt > 3)
ath9k_hw_bstuck_nfcal(ah);
} else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
sc->beacon.bmisscnt = 0;
ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
}
return;
}
slot = ath9k_beacon_choose_slot(sc);
vif = sc->beacon.bslot[slot];
if (!vif || !vif->bss_conf.enable_beacon)
return;
bf = ath9k_beacon_generate(sc->hw, vif);
WARN_ON(!bf);
if (sc->beacon.bmisscnt != 0) {
ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
sc->beacon.bmisscnt);
sc->beacon.bmisscnt = 0;
}
/*
* Handle slot time change when a non-ERP station joins/leaves
* an 11g network. The 802.11 layer notifies us via callback,
* we mark updateslot, then wait one beacon before effecting
* the change. This gives associated stations at least one
* beacon interval to note the state change.
*
* NB: The slot time change state machine is clocked according
* to whether we are bursting or staggering beacons. We
* recognize the request to update and record the current
* slot then don't transition until that slot is reached
* again. If we miss a beacon for that slot then we'll be
* slow to transition but we'll be sure at least one beacon
* interval has passed. When bursting slot is always left
* set to ATH_BCBUF so this check is a noop.
*/
if (sc->beacon.updateslot == UPDATE) {
sc->beacon.updateslot = COMMIT;
sc->beacon.slotupdate = slot;
} else if (sc->beacon.updateslot == COMMIT &&
sc->beacon.slotupdate == slot) {
ah->slottime = sc->beacon.slottime;
ath9k_hw_init_global_settings(ah);
sc->beacon.updateslot = OK;
}
if (bf) {
ath9k_reset_beacon_status(sc);
ath_dbg(common, BEACON,
"Transmitting beacon for slot: %d\n", slot);
/* NB: cabq traffic should already be queued and primed */
ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
if (!edma)
ath9k_hw_txstart(ah, sc->beacon.beaconq);
}
}
