OpenCloudOS-Kernel/drivers/net/wireless/ath/ath9k/beacon.c

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/*
* Copyright (c) 2008-2009 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ath9k.h"
#define FUDGE 2
/*
* This function will modify certain transmit queue properties depending on
* the operating mode of the station (AP or AdHoc). Parameters are AIFS
* settings and channel width min/max
*/
int ath_beaconq_config(struct ath_softc *sc)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_tx_queue_info qi, qi_be;
int qnum;
ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
/* Always burst out beacon and CAB traffic. */
qi.tqi_aifs = 1;
qi.tqi_cwmin = 0;
qi.tqi_cwmax = 0;
} else {
/* Adhoc mode; important thing is to use 2x cwmin. */
qnum = sc->tx.hwq_map[WME_AC_BE];
ath9k_hw_get_txq_props(ah, qnum, &qi_be);
qi.tqi_aifs = qi_be.tqi_aifs;
qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
qi.tqi_cwmax = qi_be.tqi_cwmax;
}
if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
ath_print(common, ATH_DBG_FATAL,
"Unable to update h/w beacon queue parameters\n");
return 0;
} else {
ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
return 1;
}
}
/*
* Associates the beacon frame buffer with a transmit descriptor. Will set
* up all required antenna switch parameters, 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, antenna, ctsrate = 0, ctsduration = 0;
struct ieee80211_supported_band *sband;
u8 rate = 0;
ds = bf->bf_desc;
flags = ATH9K_TXDESC_NOACK;
ds->ds_link = 0;
/*
* Switch antenna every beacon.
* Should only switch every beacon period, not for every SWBA
* XXX assumes two antennae
*/
antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
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 = common->tx_chainmask;
series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
series, 4, 0);
}
static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct ath_wiphy *aphy = hw->priv;
struct ath_softc *sc = aphy->sc;
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;
if (aphy->state != ATH_WIPHY_ACTIVE)
return NULL;
avp = (void *)vif->drv_priv;
cabq = sc->beacon.cabq;
if (avp->av_bcbuf == NULL)
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_print(common, ATH_DBG_FATAL,
"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_print(common, ATH_DBG_BEACON,
"Flushing previous cabq traffic\n");
ath_draintxq(sc, cabq, false);
}
}
ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
while (skb) {
ath_tx_cabq(hw, skb);
skb = ieee80211_get_buffered_bc(hw, vif);
}
return bf;
}
int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
{
struct ath_softc *sc = aphy->sc;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp;
struct ath_buf *bf;
struct sk_buff *skb;
__le64 tstamp;
avp = (void *)vif->drv_priv;
/* Allocate a beacon descriptor if we haven't done so. */
if (!avp->av_bcbuf) {
/* Allocate beacon state for hostap/ibss. We know
* a buffer is available. */
avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
struct ath_buf, list);
list_del(&avp->av_bcbuf->list);
if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC ||
sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
int slot;
/*
* Assign the vif to a beacon xmit slot. As
* above, this cannot fail to find one.
*/
avp->av_bslot = 0;
for (slot = 0; slot < ATH_BCBUF; slot++)
if (sc->beacon.bslot[slot] == NULL) {
avp->av_bslot = slot;
/* NB: keep looking for a double slot */
if (slot == 0 || !sc->beacon.bslot[slot-1])
break;
}
BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
sc->beacon.bslot[avp->av_bslot] = vif;
sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
sc->nbcnvifs++;
}
}
/* release the previous beacon frame, if it already exists. */
bf = avp->av_bcbuf;
if (bf->bf_mpdu != NULL) {
skb = bf->bf_mpdu;
dma_unmap_single(sc->dev, bf->bf_buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
bf->bf_mpdu = NULL;
bf->bf_buf_addr = 0;
}
/* NB: the beacon data buffer must be 32-bit aligned. */
skb = ieee80211_beacon_get(sc->hw, vif);
if (skb == NULL) {
ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
return -ENOMEM;
}
tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
/* Calculate a TSF adjustment factor required for staggered beacons. */
if (avp->av_bslot > 0) {
u64 tsfadjust;
int intval;
intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
/*
* Calculate the TSF offset for this beacon slot, i.e., the
* number of usecs that need to be added to the timestamp field
* in Beacon and Probe Response frames. Beacon slot 0 is
* processed at the correct offset, so it does not require TSF
* adjustment. Other slots are adjusted to get the timestamp
* close to the TBTT for the BSS.
*/
tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
ath_print(common, ATH_DBG_BEACON,
"stagger beacons, bslot %d intval "
"%u tsfadjust %llu\n",
avp->av_bslot, intval, (unsigned long long)tsfadjust);
((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
avp->tsf_adjust;
} else
avp->tsf_adjust = cpu_to_le64(0);
bf->bf_mpdu = skb;
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_print(common, ATH_DBG_FATAL,
"dma_mapping_error on beacon alloc\n");
return -ENOMEM;
}
return 0;
}
void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
{
if (avp->av_bcbuf != NULL) {
struct ath_buf *bf;
if (avp->av_bslot != -1) {
sc->beacon.bslot[avp->av_bslot] = NULL;
sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
sc->nbcnvifs--;
}
bf = avp->av_bcbuf;
if (bf->bf_mpdu != NULL) {
struct sk_buff *skb = bf->bf_mpdu;
dma_unmap_single(sc->dev, bf->bf_buf_addr,
skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
bf->bf_mpdu = NULL;
bf->bf_buf_addr = 0;
}
list_add_tail(&bf->list, &sc->beacon.bbuf);
avp->av_bcbuf = NULL;
}
}
void ath_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;
struct ath_wiphy *aphy;
int slot;
u32 bfaddr, bc = 0, tsftu;
u64 tsf;
u16 intval;
/*
* 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 (sc->beacon.bmisscnt < BSTUCK_THRESH) {
ath_print(common, ATH_DBG_BSTUCK,
"missed %u consecutive beacons\n",
sc->beacon.bmisscnt);
ath9k: use AP beacon miss as a trigger for fast recalibration When beacons get stuck in AP mode, the most likely cause is interference. Such interference can often go on for a while, and too many consecutive beacon misses can lead to connected clients getting dropped. Since connected clients might not be subjected to the same interference if that happens to be very local, the AP should try to deal with it as good as it can. One way to do this is to trigger an NF calibration with automatic baseband update right after the beacon miss. In my tests with very strong interference, this allowed the AP to continue transmitting beacons after only 2-3 misses, which allows a normal client to stay connected. With some of the newer - really sensitive - chips, the maximum noise floor limit is very low, which can be problematic during very strong interference. To avoid an endless loop of stuck beacons -> nfcal -> periodic calibration -> stuck beacons, the beacon miss event also sets a flag, which allows the calibration code to bypass the chip specific maximum NF value. This flag is automatically cleared, as soon as the first NF median goes back below the limits for all chains. In my tests, this allowed an ath9k AP to survive very strong interference (measured NF: -68, or sometimes even higher) without losing connectivity to its clients. Even under these conditions, I was able to transmit several mbits/s through the interface. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-08-02 21:53:14 +08:00
ath9k_hw_bstuck_nfcal(ah);
} else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
ath_print(common, ATH_DBG_BSTUCK,
"beacon is officially stuck\n");
sc->sc_flags |= SC_OP_TSF_RESET;
ath_reset(sc, true);
}
return;
}
if (sc->beacon.bmisscnt != 0) {
ath_print(common, ATH_DBG_BSTUCK,
"resume beacon xmit after %u misses\n",
sc->beacon.bmisscnt);
sc->beacon.bmisscnt = 0;
}
/*
* Generate beacon frames. we are sending frames
* staggered so calculate the slot for this frame based
* on the tsf to safeguard against missing an swba.
*/
intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
tsf = ath9k_hw_gettsf64(ah);
tsftu = TSF_TO_TU(tsf>>32, tsf);
slot = ((tsftu % intval) * ATH_BCBUF) / intval;
/*
* Reverse the slot order to get slot 0 on the TBTT offset that does
* not require TSF adjustment and other slots adding
* slot/ATH_BCBUF * beacon_int to timestamp. For example, with
* ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
* and slot 0 is at correct offset to TBTT.
*/
slot = ATH_BCBUF - slot - 1;
vif = sc->beacon.bslot[slot];
aphy = sc->beacon.bslot_aphy[slot];
ath_print(common, ATH_DBG_BEACON,
"slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
slot, tsf, tsftu, intval, vif);
bfaddr = 0;
if (vif) {
bf = ath_beacon_generate(aphy->hw, vif);
if (bf != NULL) {
bfaddr = bf->bf_daddr;
bc = 1;
}
}
/*
* 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; /* commit next beacon */
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 (bfaddr != 0) {
/*
* Stop any current dma and put the new frame(s) on the queue.
* This should never fail since we check above that no frames
* are still pending on the queue.
*/
if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
ath_print(common, ATH_DBG_FATAL,
"beacon queue %u did not stop?\n", sc->beacon.beaconq);
}
/* NB: cabq traffic should already be queued and primed */
ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
ath9k_hw_txstart(ah, sc->beacon.beaconq);
sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
}
}
static void ath9k_beacon_init(struct ath_softc *sc,
u32 next_beacon,
u32 beacon_period)
{
if (beacon_period & ATH9K_BEACON_RESET_TSF)
ath9k_ps_wakeup(sc);
ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
if (beacon_period & ATH9K_BEACON_RESET_TSF)
ath9k_ps_restore(sc);
}
/*
* For multi-bss ap support beacons are either staggered evenly over N slots or
* burst together. For the former arrange for the SWBA to be delivered for each
* slot. Slots that are not occupied will generate nothing.
*/
static void ath_beacon_config_ap(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
u32 nexttbtt, intval;
/* NB: the beacon interval is kept internally in TU's */
intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
intval /= ATH_BCBUF; /* for staggered beacons */
nexttbtt = intval;
if (sc->sc_flags & SC_OP_TSF_RESET)
intval |= ATH9K_BEACON_RESET_TSF;
/*
* In AP mode we enable the beacon timers and SWBA interrupts to
* prepare beacon frames.
*/
intval |= ATH9K_BEACON_ENA;
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
/* Set the computed AP beacon timers */
ath9k_hw_set_interrupts(ah, 0);
ath9k_beacon_init(sc, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(ah, ah->imask);
/* Clear the reset TSF flag, so that subsequent beacon updation
will not reset the HW TSF. */
sc->sc_flags &= ~SC_OP_TSF_RESET;
}
/*
* This sets up the beacon timers according to the timestamp of the last
* received beacon and the current TSF, configures PCF and DTIM
* handling, programs the sleep registers so the hardware will wakeup in
* time to receive beacons, and configures the beacon miss handling so
* we'll receive a BMISS interrupt when we stop seeing beacons from the AP
* we've associated with.
*/
static void ath_beacon_config_sta(struct ath_softc *sc,
struct ath_beacon_config *conf)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath9k_beacon_state bs;
int dtimperiod, dtimcount, sleepduration;
int cfpperiod, cfpcount;
u32 nexttbtt = 0, intval, tsftu;
u64 tsf;
int num_beacons, offset, dtim_dec_count, cfp_dec_count;
/* No need to configure beacon if we are not associated */
if (!common->curaid) {
ath_print(common, ATH_DBG_BEACON,
"STA is not yet associated..skipping beacon config\n");
return;
}
memset(&bs, 0, sizeof(bs));
intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
/*
* Setup dtim and cfp parameters according to
* last beacon we received (which may be none).
*/
dtimperiod = conf->dtim_period;
if (dtimperiod <= 0) /* NB: 0 if not known */
dtimperiod = 1;
dtimcount = conf->dtim_count;
if (dtimcount >= dtimperiod) /* NB: sanity check */
dtimcount = 0;
cfpperiod = 1; /* NB: no PCF support yet */
cfpcount = 0;
sleepduration = conf->listen_interval * intval;
if (sleepduration <= 0)
sleepduration = intval;
/*
* Pull nexttbtt forward to reflect the current
* TSF and calculate dtim+cfp state for the result.
*/
tsf = ath9k_hw_gettsf64(ah);
tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
num_beacons = tsftu / intval + 1;
offset = tsftu % intval;
nexttbtt = tsftu - offset;
if (offset)
nexttbtt += intval;
/* DTIM Beacon every dtimperiod Beacon */
dtim_dec_count = num_beacons % dtimperiod;
/* CFP every cfpperiod DTIM Beacon */
cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
if (dtim_dec_count)
cfp_dec_count++;
dtimcount -= dtim_dec_count;
if (dtimcount < 0)
dtimcount += dtimperiod;
cfpcount -= cfp_dec_count;
if (cfpcount < 0)
cfpcount += cfpperiod;
bs.bs_intval = intval;
bs.bs_nexttbtt = nexttbtt;
bs.bs_dtimperiod = dtimperiod*intval;
bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
bs.bs_cfpmaxduration = 0;
/*
* Calculate the number of consecutive beacons to miss* before taking
* a BMISS interrupt. The configuration is specified in TU so we only
* need calculate based on the beacon interval. Note that we clamp the
* result to at most 15 beacons.
*/
if (sleepduration > intval) {
bs.bs_bmissthreshold = conf->listen_interval *
ATH_DEFAULT_BMISS_LIMIT / 2;
} else {
bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
if (bs.bs_bmissthreshold > 15)
bs.bs_bmissthreshold = 15;
else if (bs.bs_bmissthreshold <= 0)
bs.bs_bmissthreshold = 1;
}
/*
* Calculate sleep duration. The configuration is given in ms.
* We ensure a multiple of the beacon period is used. Also, if the sleep
* duration is greater than the DTIM period then it makes senses
* to make it a multiple of that.
*
* XXX fixed at 100ms
*/
bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
if (bs.bs_sleepduration > bs.bs_dtimperiod)
bs.bs_sleepduration = bs.bs_dtimperiod;
/* TSF out of range threshold fixed at 1 second */
bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
ath_print(common, ATH_DBG_BEACON,
"bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
bs.bs_bmissthreshold, bs.bs_sleepduration,
bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
/* Set the computed STA beacon timers */
ath9k_hw_set_interrupts(ah, 0);
ath9k_hw_set_sta_beacon_timers(ah, &bs);
ah->imask |= ATH9K_INT_BMISS;
ath9k_hw_set_interrupts(ah, ah->imask);
}
static void ath_beacon_config_adhoc(struct ath_softc *sc,
struct ath_beacon_config *conf,
struct ieee80211_vif *vif)
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
u64 tsf;
u32 tsftu, intval, nexttbtt;
intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
/* Pull nexttbtt forward to reflect the current TSF */
nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
if (nexttbtt == 0)
nexttbtt = intval;
else if (intval)
nexttbtt = roundup(nexttbtt, intval);
tsf = ath9k_hw_gettsf64(ah);
tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
do {
nexttbtt += intval;
} while (nexttbtt < tsftu);
ath_print(common, ATH_DBG_BEACON,
"IBSS nexttbtt %u intval %u (%u)\n",
nexttbtt, intval, conf->beacon_interval);
/*
* 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.
*/
intval |= ATH9K_BEACON_ENA;
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
/* Set the computed ADHOC beacon timers */
ath9k_hw_set_interrupts(ah, 0);
ath9k_beacon_init(sc, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(ah, ah->imask);
}
void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
{
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
enum nl80211_iftype iftype;
/* Setup the beacon configuration parameters */
if (vif) {
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
iftype = vif->type;
cur_conf->beacon_interval = bss_conf->beacon_int;
cur_conf->dtim_period = bss_conf->dtim_period;
cur_conf->listen_interval = 1;
cur_conf->dtim_count = 1;
cur_conf->bmiss_timeout =
ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
} else {
iftype = sc->sc_ah->opmode;
}
/*
* It looks like mac80211 may end up using beacon interval of zero in
* some cases (at least for mesh point). Avoid getting into an
* infinite loop by using a bit safer value instead. To be safe,
* do sanity check on beacon interval for all operating modes.
*/
if (cur_conf->beacon_interval == 0)
cur_conf->beacon_interval = 100;
switch (iftype) {
case NL80211_IFTYPE_AP:
ath_beacon_config_ap(sc, cur_conf);
break;
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_MESH_POINT:
ath_beacon_config_adhoc(sc, cur_conf, vif);
break;
case NL80211_IFTYPE_STATION:
ath_beacon_config_sta(sc, cur_conf);
break;
default:
ath_print(common, ATH_DBG_CONFIG,
"Unsupported beaconing mode\n");
return;
}
sc->sc_flags |= SC_OP_BEACONS;
}