/*
* Copyright (c) 2008-2011 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
static void ath9k_reset_beacon_status(struct ath_softc *sc)
{
sc->beacon.tx_processed = false;
sc->beacon.tx_last = false;
}
/*
* 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;
struct ath_txq *txq;
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. */
txq = sc->tx.txq_map[WME_AC_BE];
ath9k_hw_get_txq_props(ah, txq->axq_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_err(common,
"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 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);
}
static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
{
struct ath_softc *sc = hw->priv;
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_tx_control txctl;
memset(&txctl, 0, sizeof(struct ath_tx_control));
txctl.txq = sc->beacon.cabq;
ath_dbg(common, ATH_DBG_XMIT,
"transmitting CABQ packet, skb: %p\n", skb);
if (ath_tx_start(hw, skb, &txctl) != 0) {
ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
dev_kfree_skb_any(skb);
}
}
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, 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_softc *sc, struct ieee80211_vif *vif)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_vif *avp;
struct ath_buf *bf;
struct sk_buff *skb;
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
__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 (ath9k_uses_beacons(vif->type)) {
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;
avp->is_bslot_active = false;
/* 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->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)
return -ENOMEM;
tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
/* Calculate a TSF adjustment factor required for staggered beacons. */
if (avp->av_bslot > 0) {
u64 tsfadjust;
int intval;
intval = cur_conf->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 = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
avp->tsf_adjust = cpu_to_le64(tsfadjust);
ath_dbg(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_err(common, "dma_mapping_error on beacon alloc\n");
return -ENOMEM;
}
avp->is_bslot_active = true;
return 0;
}
void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
{
if (avp->av_bcbuf != NULL) {
struct ath_buf *bf;
avp->is_bslot_active = false;
if (avp->av_bslot != -1) {
sc->beacon.bslot[avp->av_bslot] = NULL;
sc->nbcnvifs--;
avp->av_bslot = -1;
}
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_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
struct ath_buf *bf = NULL;
struct ieee80211_vif *vif;
int slot;
u32 bfaddr, bc = 0;
/*
* 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 * sc->nbcnvifs) {
ath_dbg(common, ATH_DBG_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, ATH_DBG_BSTUCK,
"beacon is officially stuck\n");
sc->sc_flags |= SC_OP_TSF_RESET;
ath_reset(sc, true);
}
return;
}
/*
* 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.
*/
if (ah->opmode == NL80211_IFTYPE_AP) {
u16 intval;
u32 tsftu;
u64 tsf;
intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
tsf = ath9k_hw_gettsf64(ah);
tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
slot = (tsftu % (intval * ATH_BCBUF)) / intval;
vif = sc->beacon.bslot[slot];
ath_dbg(common, ATH_DBG_BEACON,
"slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
slot, tsf, tsftu / ATH_BCBUF, intval, vif);
} else {
slot = 0;
vif = sc->beacon.bslot[slot];
}
bfaddr = 0;
if (vif) {
bf = ath_beacon_generate(sc->hw, vif);
if (bf != NULL) {
bfaddr = bf->bf_daddr;
bc = 1;
}
if (sc->beacon.bmisscnt != 0) {
ath_dbg(common, ATH_DBG_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; /* 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) {
/* 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 (sc->sc_flags & SC_OP_TSF_RESET) {
ath9k_ps_wakeup(sc);
ath9k_hw_reset_tsf(sc->sc_ah);
}
ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
if (sc->sc_flags & SC_OP_TSF_RESET) {
ath9k_ps_restore(sc);
sc->sc_flags &= ~SC_OP_TSF_RESET;
}
}
/*
* 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 = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
intval /= ATH_BCBUF; /* for staggered beacons */
nexttbtt = intval;
/*
* In AP mode we enable the beacon timers and SWBA interrupts to
* prepare beacon frames.
*/
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
/* Set the computed AP beacon timers */
ath9k_hw_disable_interrupts(ah);
ath9k_beacon_init(sc, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(ah, ah->imask);
}
/*
* 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_dbg(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;
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;
/*
* 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_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
ath_dbg(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_disable_interrupts(ah);
ath9k_hw_set_sta_beacon_timers(ah, &bs);
ah->imask |= ATH9K_INT_BMISS;
/*
* If the beacon config is called beacause of TSFOOR,
* Interrupts will be enabled back at the end of ath9k_tasklet
*/
if (!(sc->ps_flags & PS_TSFOOR_SYNC))
ath9k_hw_set_interrupts(ah, ah->imask);
}
static void ath_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 tsf, delta, intval, nexttbtt;
ath9k_reset_beacon_status(sc);
tsf = ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE);
intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
if (!sc->beacon.bc_tstamp)
nexttbtt = tsf + intval;
else {
if (tsf > sc->beacon.bc_tstamp)
delta = (tsf - sc->beacon.bc_tstamp);
else
delta = (tsf + 1 + (~0U - sc->beacon.bc_tstamp));
nexttbtt = tsf + intval - (delta % intval);
}
ath_dbg(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.
*/
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
/* Set the computed ADHOC beacon timers */
ath9k_hw_disable_interrupts(ah);
ath9k_beacon_init(sc, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
/*
* If the beacon config is called beacause of TSFOOR,
* Interrupts will be enabled back at the end of ath9k_tasklet
*/
if (!(sc->ps_flags & PS_TSFOOR_SYNC))
ath9k_hw_set_interrupts(ah, ah->imask);
}
static bool ath9k_allow_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);
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
struct ath_vif *avp = (void *)vif->drv_priv;
/*
* Can not have different beacon interval on multiple
* AP interface case
*/
if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
(sc->nbcnvifs > 1) &&
(vif->type == NL80211_IFTYPE_AP) &&
(cur_conf->beacon_interval != bss_conf->beacon_int)) {
ath_dbg(common, ATH_DBG_CONFIG,
"Changing beacon interval of multiple \
AP interfaces !\n");
return false;
}
/*
* Can not configure station vif's beacon config
* while on AP opmode
*/
if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
(vif->type != NL80211_IFTYPE_AP)) {
ath_dbg(common, ATH_DBG_CONFIG,
"STA vif's beacon not allowed on AP mode\n");
return false;
}
/*
* Do not allow beacon config if HW was already configured
* with another STA vif
*/
if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
(vif->type == NL80211_IFTYPE_STATION) &&
(sc->sc_flags & SC_OP_BEACONS) &&
!avp->primary_sta_vif) {
ath_dbg(common, ATH_DBG_CONFIG,
"Beacon already configured for a station interface\n");
return false;
}
return true;
}
void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
{
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
if (!ath9k_allow_beacon_config(sc, vif))
return;
/* Setup the beacon configuration parameters */
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;
/*
* 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;
/*
* We don't parse dtim period from mac80211 during the driver
* initialization as it breaks association with hidden-ssid
* AP and it causes latency in roaming
*/
if (cur_conf->dtim_period == 0)
cur_conf->dtim_period = 1;
ath_set_beacon(sc);
}
static bool ath_has_valid_bslot(struct ath_softc *sc)
{
struct ath_vif *avp;
int slot;
bool found = false;
for (slot = 0; slot < ATH_BCBUF; slot++) {
if (sc->beacon.bslot[slot]) {
avp = (void *)sc->beacon.bslot[slot]->drv_priv;
if (avp->is_bslot_active) {
found = true;
break;
}
}
}
return found;
}
void ath_set_beacon(struct ath_softc *sc)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
switch (sc->sc_ah->opmode) {
case NL80211_IFTYPE_AP:
if (ath_has_valid_bslot(sc))
ath_beacon_config_ap(sc, cur_conf);
break;
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_MESH_POINT:
ath_beacon_config_adhoc(sc, cur_conf);
break;
case NL80211_IFTYPE_STATION:
ath_beacon_config_sta(sc, cur_conf);
break;
default:
ath_dbg(common, ATH_DBG_CONFIG,
"Unsupported beaconing mode\n");
return;
}
sc->sc_flags |= SC_OP_BEACONS;
}
void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
{
struct ath_hw *ah = sc->sc_ah;
if (!ath_has_valid_bslot(sc))
return;
ath9k_ps_wakeup(sc);
if (status) {
/* Re-enable beaconing */
ah->imask |= ATH9K_INT_SWBA;
ath9k_hw_set_interrupts(ah, ah->imask);
} else {
/* Disable SWBA interrupt */
ah->imask &= ~ATH9K_INT_SWBA;
ath9k_hw_set_interrupts(ah, ah->imask);
tasklet_kill(&sc->bcon_tasklet);
ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
}
ath9k_ps_restore(sc);
}
