2 * Copyright (c) 2008-2009 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 * This function will modify certain transmit queue properties depending on
23 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
24 * settings and channel width min/max
26 int ath_beaconq_config(struct ath_softc *sc)
28 struct ath_hw *ah = sc->sc_ah;
29 struct ath_common *common = ath9k_hw_common(ah);
30 struct ath9k_tx_queue_info qi, qi_be;
33 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
34 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
35 /* Always burst out beacon and CAB traffic. */
40 /* Adhoc mode; important thing is to use 2x cwmin. */
41 txq = sc->tx.txq_map[WME_AC_BE];
42 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
43 qi.tqi_aifs = qi_be.tqi_aifs;
44 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
45 qi.tqi_cwmax = qi_be.tqi_cwmax;
48 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
50 "Unable to update h/w beacon queue parameters\n");
53 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
59 * Associates the beacon frame buffer with a transmit descriptor. Will set
60 * up all required antenna switch parameters, rate codes, and channel flags.
61 * Beacons are always sent out at the lowest rate, and are not retried.
63 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
64 struct ath_buf *bf, int rateidx)
66 struct sk_buff *skb = bf->bf_mpdu;
67 struct ath_hw *ah = sc->sc_ah;
68 struct ath_common *common = ath9k_hw_common(ah);
70 struct ath9k_11n_rate_series series[4];
71 int flags, antenna, ctsrate = 0, ctsduration = 0;
72 struct ieee80211_supported_band *sband;
76 flags = ATH9K_TXDESC_NOACK;
80 * Switch antenna every beacon.
81 * Should only switch every beacon period, not for every SWBA
82 * XXX assumes two antennae
84 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
86 sband = &sc->sbands[common->hw->conf.channel->band];
87 rate = sband->bitrates[rateidx].hw_value;
88 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
89 rate |= sband->bitrates[rateidx].hw_value_short;
91 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
92 ATH9K_PKT_TYPE_BEACON,
94 ATH9K_TXKEYIX_INVALID,
98 /* NB: beacon's BufLen must be a multiple of 4 bytes */
99 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
100 true, true, ds, bf->bf_buf_addr,
103 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
105 series[0].Rate = rate;
106 series[0].ChSel = ath_txchainmask_reduction(sc,
107 common->tx_chainmask, series[0].Rate);
108 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
109 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
113 static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
115 struct ath_wiphy *aphy = hw->priv;
116 struct ath_softc *sc = aphy->sc;
117 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
118 struct ath_tx_control txctl;
120 memset(&txctl, 0, sizeof(struct ath_tx_control));
121 txctl.txq = sc->beacon.cabq;
123 ath_print(common, ATH_DBG_XMIT,
124 "transmitting CABQ packet, skb: %p\n", skb);
126 if (ath_tx_start(hw, skb, &txctl) != 0) {
127 ath_print(common, ATH_DBG_XMIT, "CABQ TX failed\n");
128 dev_kfree_skb_any(skb);
132 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
133 struct ieee80211_vif *vif)
135 struct ath_wiphy *aphy = hw->priv;
136 struct ath_softc *sc = aphy->sc;
137 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
141 struct ath_txq *cabq;
142 struct ieee80211_tx_info *info;
145 if (aphy->state != ATH_WIPHY_ACTIVE)
148 avp = (void *)vif->drv_priv;
149 cabq = sc->beacon.cabq;
151 if (avp->av_bcbuf == NULL)
154 /* Release the old beacon first */
159 dma_unmap_single(sc->dev, bf->bf_buf_addr,
160 skb->len, DMA_TO_DEVICE);
161 dev_kfree_skb_any(skb);
165 /* Get a new beacon from mac80211 */
167 skb = ieee80211_beacon_get(hw, vif);
171 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
174 info = IEEE80211_SKB_CB(skb);
175 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
177 * TODO: make sure the seq# gets assigned properly (vs. other
180 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
181 sc->tx.seq_no += 0x10;
182 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
183 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
186 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
187 skb->len, DMA_TO_DEVICE);
188 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
189 dev_kfree_skb_any(skb);
192 ath_err(common, "dma_mapping_error on beaconing\n");
196 skb = ieee80211_get_buffered_bc(hw, vif);
199 * if the CABQ traffic from previous DTIM is pending and the current
200 * beacon is also a DTIM.
201 * 1) if there is only one vif let the cab traffic continue.
202 * 2) if there are more than one vif and we are using staggered
203 * beacons, then drain the cabq by dropping all the frames in
204 * the cabq so that the current vifs cab traffic can be scheduled.
206 spin_lock_bh(&cabq->axq_lock);
207 cabq_depth = cabq->axq_depth;
208 spin_unlock_bh(&cabq->axq_lock);
210 if (skb && cabq_depth) {
212 ath_print(common, ATH_DBG_BEACON,
213 "Flushing previous cabq traffic\n");
214 ath_draintxq(sc, cabq, false);
218 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
221 ath_tx_cabq(hw, skb);
222 skb = ieee80211_get_buffered_bc(hw, vif);
228 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
230 struct ath_softc *sc = aphy->sc;
231 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
237 avp = (void *)vif->drv_priv;
239 /* Allocate a beacon descriptor if we haven't done so. */
240 if (!avp->av_bcbuf) {
241 /* Allocate beacon state for hostap/ibss. We know
242 * a buffer is available. */
243 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
244 struct ath_buf, list);
245 list_del(&avp->av_bcbuf->list);
247 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
248 sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC ||
249 sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
252 * Assign the vif to a beacon xmit slot. As
253 * above, this cannot fail to find one.
256 for (slot = 0; slot < ATH_BCBUF; slot++)
257 if (sc->beacon.bslot[slot] == NULL) {
258 avp->av_bslot = slot;
260 /* NB: keep looking for a double slot */
261 if (slot == 0 || !sc->beacon.bslot[slot-1])
264 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
265 sc->beacon.bslot[avp->av_bslot] = vif;
266 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
271 /* release the previous beacon frame, if it already exists. */
273 if (bf->bf_mpdu != NULL) {
275 dma_unmap_single(sc->dev, bf->bf_buf_addr,
276 skb->len, DMA_TO_DEVICE);
277 dev_kfree_skb_any(skb);
282 /* NB: the beacon data buffer must be 32-bit aligned. */
283 skb = ieee80211_beacon_get(sc->hw, vif);
285 ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
289 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
290 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
291 /* Calculate a TSF adjustment factor required for staggered beacons. */
292 if (avp->av_bslot > 0) {
296 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
299 * Calculate the TSF offset for this beacon slot, i.e., the
300 * number of usecs that need to be added to the timestamp field
301 * in Beacon and Probe Response frames. Beacon slot 0 is
302 * processed at the correct offset, so it does not require TSF
303 * adjustment. Other slots are adjusted to get the timestamp
304 * close to the TBTT for the BSS.
306 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
307 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
309 ath_print(common, ATH_DBG_BEACON,
310 "stagger beacons, bslot %d intval "
311 "%u tsfadjust %llu\n",
312 avp->av_bslot, intval, (unsigned long long)tsfadjust);
314 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
317 avp->tsf_adjust = cpu_to_le64(0);
320 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
321 skb->len, DMA_TO_DEVICE);
322 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
323 dev_kfree_skb_any(skb);
326 ath_err(common, "dma_mapping_error on beacon alloc\n");
333 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
335 if (avp->av_bcbuf != NULL) {
338 if (avp->av_bslot != -1) {
339 sc->beacon.bslot[avp->av_bslot] = NULL;
340 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
345 if (bf->bf_mpdu != NULL) {
346 struct sk_buff *skb = bf->bf_mpdu;
347 dma_unmap_single(sc->dev, bf->bf_buf_addr,
348 skb->len, DMA_TO_DEVICE);
349 dev_kfree_skb_any(skb);
353 list_add_tail(&bf->list, &sc->beacon.bbuf);
355 avp->av_bcbuf = NULL;
359 void ath_beacon_tasklet(unsigned long data)
361 struct ath_softc *sc = (struct ath_softc *)data;
362 struct ath_hw *ah = sc->sc_ah;
363 struct ath_common *common = ath9k_hw_common(ah);
364 struct ath_buf *bf = NULL;
365 struct ieee80211_vif *vif;
366 struct ath_wiphy *aphy;
368 u32 bfaddr, bc = 0, tsftu;
373 * Check if the previous beacon has gone out. If
374 * not don't try to post another, skip this period
375 * and wait for the next. Missed beacons indicate
376 * a problem and should not occur. If we miss too
377 * many consecutive beacons reset the device.
379 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
380 sc->beacon.bmisscnt++;
382 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
383 ath_print(common, ATH_DBG_BSTUCK,
384 "missed %u consecutive beacons\n",
385 sc->beacon.bmisscnt);
386 ath9k_hw_bstuck_nfcal(ah);
387 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
388 ath_print(common, ATH_DBG_BSTUCK,
389 "beacon is officially stuck\n");
390 sc->sc_flags |= SC_OP_TSF_RESET;
397 if (sc->beacon.bmisscnt != 0) {
398 ath_print(common, ATH_DBG_BSTUCK,
399 "resume beacon xmit after %u misses\n",
400 sc->beacon.bmisscnt);
401 sc->beacon.bmisscnt = 0;
405 * Generate beacon frames. we are sending frames
406 * staggered so calculate the slot for this frame based
407 * on the tsf to safeguard against missing an swba.
410 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
412 tsf = ath9k_hw_gettsf64(ah);
413 tsftu = TSF_TO_TU(tsf>>32, tsf);
414 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
416 * Reverse the slot order to get slot 0 on the TBTT offset that does
417 * not require TSF adjustment and other slots adding
418 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
419 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
420 * and slot 0 is at correct offset to TBTT.
422 slot = ATH_BCBUF - slot - 1;
423 vif = sc->beacon.bslot[slot];
424 aphy = sc->beacon.bslot_aphy[slot];
426 ath_print(common, ATH_DBG_BEACON,
427 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
428 slot, tsf, tsftu, intval, vif);
432 bf = ath_beacon_generate(aphy->hw, vif);
434 bfaddr = bf->bf_daddr;
440 * Handle slot time change when a non-ERP station joins/leaves
441 * an 11g network. The 802.11 layer notifies us via callback,
442 * we mark updateslot, then wait one beacon before effecting
443 * the change. This gives associated stations at least one
444 * beacon interval to note the state change.
446 * NB: The slot time change state machine is clocked according
447 * to whether we are bursting or staggering beacons. We
448 * recognize the request to update and record the current
449 * slot then don't transition until that slot is reached
450 * again. If we miss a beacon for that slot then we'll be
451 * slow to transition but we'll be sure at least one beacon
452 * interval has passed. When bursting slot is always left
453 * set to ATH_BCBUF so this check is a noop.
455 if (sc->beacon.updateslot == UPDATE) {
456 sc->beacon.updateslot = COMMIT; /* commit next beacon */
457 sc->beacon.slotupdate = slot;
458 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
459 ah->slottime = sc->beacon.slottime;
460 ath9k_hw_init_global_settings(ah);
461 sc->beacon.updateslot = OK;
465 * Stop any current dma and put the new frame(s) on the queue.
466 * This should never fail since we check above that no frames
467 * are still pending on the queue.
469 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
470 ath_err(common, "beacon queue %u did not stop?\n",
474 /* NB: cabq traffic should already be queued and primed */
475 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
476 ath9k_hw_txstart(ah, sc->beacon.beaconq);
478 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
482 static void ath9k_beacon_init(struct ath_softc *sc,
486 if (beacon_period & ATH9K_BEACON_RESET_TSF)
489 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
491 if (beacon_period & ATH9K_BEACON_RESET_TSF)
492 ath9k_ps_restore(sc);
496 * For multi-bss ap support beacons are either staggered evenly over N slots or
497 * burst together. For the former arrange for the SWBA to be delivered for each
498 * slot. Slots that are not occupied will generate nothing.
500 static void ath_beacon_config_ap(struct ath_softc *sc,
501 struct ath_beacon_config *conf)
503 struct ath_hw *ah = sc->sc_ah;
504 u32 nexttbtt, intval;
506 /* NB: the beacon interval is kept internally in TU's */
507 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
508 intval /= ATH_BCBUF; /* for staggered beacons */
511 if (sc->sc_flags & SC_OP_TSF_RESET)
512 intval |= ATH9K_BEACON_RESET_TSF;
515 * In AP mode we enable the beacon timers and SWBA interrupts to
516 * prepare beacon frames.
518 intval |= ATH9K_BEACON_ENA;
519 ah->imask |= ATH9K_INT_SWBA;
520 ath_beaconq_config(sc);
522 /* Set the computed AP beacon timers */
524 ath9k_hw_disable_interrupts(ah);
525 ath9k_beacon_init(sc, nexttbtt, intval);
526 sc->beacon.bmisscnt = 0;
527 ath9k_hw_set_interrupts(ah, ah->imask);
529 /* Clear the reset TSF flag, so that subsequent beacon updation
530 will not reset the HW TSF. */
532 sc->sc_flags &= ~SC_OP_TSF_RESET;
536 * This sets up the beacon timers according to the timestamp of the last
537 * received beacon and the current TSF, configures PCF and DTIM
538 * handling, programs the sleep registers so the hardware will wakeup in
539 * time to receive beacons, and configures the beacon miss handling so
540 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
541 * we've associated with.
543 static void ath_beacon_config_sta(struct ath_softc *sc,
544 struct ath_beacon_config *conf)
546 struct ath_hw *ah = sc->sc_ah;
547 struct ath_common *common = ath9k_hw_common(ah);
548 struct ath9k_beacon_state bs;
549 int dtimperiod, dtimcount, sleepduration;
550 int cfpperiod, cfpcount;
551 u32 nexttbtt = 0, intval, tsftu;
553 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
555 /* No need to configure beacon if we are not associated */
556 if (!common->curaid) {
557 ath_print(common, ATH_DBG_BEACON,
558 "STA is not yet associated..skipping beacon config\n");
562 memset(&bs, 0, sizeof(bs));
563 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
566 * Setup dtim and cfp parameters according to
567 * last beacon we received (which may be none).
569 dtimperiod = conf->dtim_period;
570 if (dtimperiod <= 0) /* NB: 0 if not known */
572 dtimcount = conf->dtim_count;
573 if (dtimcount >= dtimperiod) /* NB: sanity check */
575 cfpperiod = 1; /* NB: no PCF support yet */
578 sleepduration = conf->listen_interval * intval;
579 if (sleepduration <= 0)
580 sleepduration = intval;
583 * Pull nexttbtt forward to reflect the current
584 * TSF and calculate dtim+cfp state for the result.
586 tsf = ath9k_hw_gettsf64(ah);
587 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
589 num_beacons = tsftu / intval + 1;
590 offset = tsftu % intval;
591 nexttbtt = tsftu - offset;
595 /* DTIM Beacon every dtimperiod Beacon */
596 dtim_dec_count = num_beacons % dtimperiod;
597 /* CFP every cfpperiod DTIM Beacon */
598 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
602 dtimcount -= dtim_dec_count;
604 dtimcount += dtimperiod;
606 cfpcount -= cfp_dec_count;
608 cfpcount += cfpperiod;
610 bs.bs_intval = intval;
611 bs.bs_nexttbtt = nexttbtt;
612 bs.bs_dtimperiod = dtimperiod*intval;
613 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
614 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
615 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
616 bs.bs_cfpmaxduration = 0;
619 * Calculate the number of consecutive beacons to miss* before taking
620 * a BMISS interrupt. The configuration is specified in TU so we only
621 * need calculate based on the beacon interval. Note that we clamp the
622 * result to at most 15 beacons.
624 if (sleepduration > intval) {
625 bs.bs_bmissthreshold = conf->listen_interval *
626 ATH_DEFAULT_BMISS_LIMIT / 2;
628 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
629 if (bs.bs_bmissthreshold > 15)
630 bs.bs_bmissthreshold = 15;
631 else if (bs.bs_bmissthreshold <= 0)
632 bs.bs_bmissthreshold = 1;
636 * Calculate sleep duration. The configuration is given in ms.
637 * We ensure a multiple of the beacon period is used. Also, if the sleep
638 * duration is greater than the DTIM period then it makes senses
639 * to make it a multiple of that.
644 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
645 if (bs.bs_sleepduration > bs.bs_dtimperiod)
646 bs.bs_sleepduration = bs.bs_dtimperiod;
648 /* TSF out of range threshold fixed at 1 second */
649 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
651 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
652 ath_print(common, ATH_DBG_BEACON,
653 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
654 bs.bs_bmissthreshold, bs.bs_sleepduration,
655 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
657 /* Set the computed STA beacon timers */
659 ath9k_hw_disable_interrupts(ah);
660 ath9k_hw_set_sta_beacon_timers(ah, &bs);
661 ah->imask |= ATH9K_INT_BMISS;
662 ath9k_hw_set_interrupts(ah, ah->imask);
665 static void ath_beacon_config_adhoc(struct ath_softc *sc,
666 struct ath_beacon_config *conf,
667 struct ieee80211_vif *vif)
669 struct ath_hw *ah = sc->sc_ah;
670 struct ath_common *common = ath9k_hw_common(ah);
672 u32 tsftu, intval, nexttbtt;
674 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
677 /* Pull nexttbtt forward to reflect the current TSF */
679 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
683 nexttbtt = roundup(nexttbtt, intval);
685 tsf = ath9k_hw_gettsf64(ah);
686 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
689 } while (nexttbtt < tsftu);
691 ath_print(common, ATH_DBG_BEACON,
692 "IBSS nexttbtt %u intval %u (%u)\n",
693 nexttbtt, intval, conf->beacon_interval);
696 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
697 * if we need to manually prepare beacon frames. Otherwise we use a
698 * self-linked tx descriptor and let the hardware deal with things.
700 intval |= ATH9K_BEACON_ENA;
701 ah->imask |= ATH9K_INT_SWBA;
703 ath_beaconq_config(sc);
705 /* Set the computed ADHOC beacon timers */
707 ath9k_hw_disable_interrupts(ah);
708 ath9k_beacon_init(sc, nexttbtt, intval);
709 sc->beacon.bmisscnt = 0;
710 ath9k_hw_set_interrupts(ah, ah->imask);
713 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
715 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
716 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
717 enum nl80211_iftype iftype;
719 /* Setup the beacon configuration parameters */
721 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
725 cur_conf->beacon_interval = bss_conf->beacon_int;
726 cur_conf->dtim_period = bss_conf->dtim_period;
727 cur_conf->listen_interval = 1;
728 cur_conf->dtim_count = 1;
729 cur_conf->bmiss_timeout =
730 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
732 iftype = sc->sc_ah->opmode;
736 * It looks like mac80211 may end up using beacon interval of zero in
737 * some cases (at least for mesh point). Avoid getting into an
738 * infinite loop by using a bit safer value instead. To be safe,
739 * do sanity check on beacon interval for all operating modes.
741 if (cur_conf->beacon_interval == 0)
742 cur_conf->beacon_interval = 100;
745 case NL80211_IFTYPE_AP:
746 ath_beacon_config_ap(sc, cur_conf);
748 case NL80211_IFTYPE_ADHOC:
749 case NL80211_IFTYPE_MESH_POINT:
750 ath_beacon_config_adhoc(sc, cur_conf, vif);
752 case NL80211_IFTYPE_STATION:
753 ath_beacon_config_sta(sc, cur_conf);
756 ath_print(common, ATH_DBG_CONFIG,
757 "Unsupported beaconing mode\n");
761 sc->sc_flags |= SC_OP_BEACONS;