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 qnum = sc->tx.hwq_map[WME_AC_BE];
42 ath9k_hw_get_txq_props(ah, 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)) {
49 ath_print(common, ATH_DBG_FATAL,
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 = common->tx_chainmask;
107 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
108 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
112 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
113 struct ieee80211_vif *vif)
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);
121 struct ath_txq *cabq;
122 struct ieee80211_tx_info *info;
125 if (aphy->state != ATH_WIPHY_ACTIVE)
128 avp = (void *)vif->drv_priv;
129 cabq = sc->beacon.cabq;
131 if (avp->av_bcbuf == NULL)
134 /* Release the old beacon first */
139 dma_unmap_single(sc->dev, bf->bf_dmacontext,
140 skb->len, DMA_TO_DEVICE);
141 dev_kfree_skb_any(skb);
144 /* Get a new beacon from mac80211 */
146 skb = ieee80211_beacon_get(hw, vif);
150 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
153 info = IEEE80211_SKB_CB(skb);
154 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
156 * TODO: make sure the seq# gets assigned properly (vs. other
159 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
160 sc->tx.seq_no += 0x10;
161 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
162 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
165 bf->bf_buf_addr = bf->bf_dmacontext =
166 dma_map_single(sc->dev, skb->data,
167 skb->len, DMA_TO_DEVICE);
168 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
169 dev_kfree_skb_any(skb);
171 ath_print(common, ATH_DBG_FATAL,
172 "dma_mapping_error on beaconing\n");
176 skb = ieee80211_get_buffered_bc(hw, vif);
179 * if the CABQ traffic from previous DTIM is pending and the current
180 * beacon is also a DTIM.
181 * 1) if there is only one vif let the cab traffic continue.
182 * 2) if there are more than one vif and we are using staggered
183 * beacons, then drain the cabq by dropping all the frames in
184 * the cabq so that the current vifs cab traffic can be scheduled.
186 spin_lock_bh(&cabq->axq_lock);
187 cabq_depth = cabq->axq_depth;
188 spin_unlock_bh(&cabq->axq_lock);
190 if (skb && cabq_depth) {
192 ath_print(common, ATH_DBG_BEACON,
193 "Flushing previous cabq traffic\n");
194 ath_draintxq(sc, cabq, false);
198 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
201 ath_tx_cabq(hw, skb);
202 skb = ieee80211_get_buffered_bc(hw, vif);
208 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
210 struct ath_softc *sc = aphy->sc;
211 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
217 avp = (void *)vif->drv_priv;
219 /* Allocate a beacon descriptor if we haven't done so. */
220 if (!avp->av_bcbuf) {
221 /* Allocate beacon state for hostap/ibss. We know
222 * a buffer is available. */
223 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
224 struct ath_buf, list);
225 list_del(&avp->av_bcbuf->list);
227 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
228 sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC ||
229 sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
232 * Assign the vif to a beacon xmit slot. As
233 * above, this cannot fail to find one.
236 for (slot = 0; slot < ATH_BCBUF; slot++)
237 if (sc->beacon.bslot[slot] == NULL) {
238 avp->av_bslot = slot;
240 /* NB: keep looking for a double slot */
241 if (slot == 0 || !sc->beacon.bslot[slot-1])
244 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
245 sc->beacon.bslot[avp->av_bslot] = vif;
246 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
251 /* release the previous beacon frame, if it already exists. */
253 if (bf->bf_mpdu != NULL) {
255 dma_unmap_single(sc->dev, bf->bf_dmacontext,
256 skb->len, DMA_TO_DEVICE);
257 dev_kfree_skb_any(skb);
261 /* NB: the beacon data buffer must be 32-bit aligned. */
262 skb = ieee80211_beacon_get(sc->hw, vif);
264 ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
268 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
269 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
270 /* Calculate a TSF adjustment factor required for staggered beacons. */
271 if (avp->av_bslot > 0) {
275 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
278 * Calculate the TSF offset for this beacon slot, i.e., the
279 * number of usecs that need to be added to the timestamp field
280 * in Beacon and Probe Response frames. Beacon slot 0 is
281 * processed at the correct offset, so it does not require TSF
282 * adjustment. Other slots are adjusted to get the timestamp
283 * close to the TBTT for the BSS.
285 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
286 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
288 ath_print(common, ATH_DBG_BEACON,
289 "stagger beacons, bslot %d intval "
290 "%u tsfadjust %llu\n",
291 avp->av_bslot, intval, (unsigned long long)tsfadjust);
293 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
296 avp->tsf_adjust = cpu_to_le64(0);
299 bf->bf_buf_addr = bf->bf_dmacontext =
300 dma_map_single(sc->dev, skb->data,
301 skb->len, DMA_TO_DEVICE);
302 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
303 dev_kfree_skb_any(skb);
305 ath_print(common, ATH_DBG_FATAL,
306 "dma_mapping_error on beacon alloc\n");
313 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
315 if (avp->av_bcbuf != NULL) {
318 if (avp->av_bslot != -1) {
319 sc->beacon.bslot[avp->av_bslot] = NULL;
320 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
325 if (bf->bf_mpdu != NULL) {
326 struct sk_buff *skb = bf->bf_mpdu;
327 dma_unmap_single(sc->dev, bf->bf_dmacontext,
328 skb->len, DMA_TO_DEVICE);
329 dev_kfree_skb_any(skb);
332 list_add_tail(&bf->list, &sc->beacon.bbuf);
334 avp->av_bcbuf = NULL;
338 void ath_beacon_tasklet(unsigned long data)
340 struct ath_softc *sc = (struct ath_softc *)data;
341 struct ath_hw *ah = sc->sc_ah;
342 struct ath_common *common = ath9k_hw_common(ah);
343 struct ath_buf *bf = NULL;
344 struct ieee80211_vif *vif;
345 struct ath_wiphy *aphy;
347 u32 bfaddr, bc = 0, tsftu;
352 * Check if the previous beacon has gone out. If
353 * not don't try to post another, skip this period
354 * and wait for the next. Missed beacons indicate
355 * a problem and should not occur. If we miss too
356 * many consecutive beacons reset the device.
358 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
359 sc->beacon.bmisscnt++;
361 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
362 ath_print(common, ATH_DBG_BEACON,
363 "missed %u consecutive beacons\n",
364 sc->beacon.bmisscnt);
365 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
366 ath_print(common, ATH_DBG_BEACON,
367 "beacon is officially stuck\n");
368 sc->sc_flags |= SC_OP_TSF_RESET;
369 ath_reset(sc, false);
375 if (sc->beacon.bmisscnt != 0) {
376 ath_print(common, ATH_DBG_BEACON,
377 "resume beacon xmit after %u misses\n",
378 sc->beacon.bmisscnt);
379 sc->beacon.bmisscnt = 0;
383 * Generate beacon frames. we are sending frames
384 * staggered so calculate the slot for this frame based
385 * on the tsf to safeguard against missing an swba.
388 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
390 tsf = ath9k_hw_gettsf64(ah);
391 tsftu = TSF_TO_TU(tsf>>32, tsf);
392 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
394 * Reverse the slot order to get slot 0 on the TBTT offset that does
395 * not require TSF adjustment and other slots adding
396 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
397 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
398 * and slot 0 is at correct offset to TBTT.
400 slot = ATH_BCBUF - slot - 1;
401 vif = sc->beacon.bslot[slot];
402 aphy = sc->beacon.bslot_aphy[slot];
404 ath_print(common, ATH_DBG_BEACON,
405 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
406 slot, tsf, tsftu, intval, vif);
410 bf = ath_beacon_generate(aphy->hw, vif);
412 bfaddr = bf->bf_daddr;
418 * Handle slot time change when a non-ERP station joins/leaves
419 * an 11g network. The 802.11 layer notifies us via callback,
420 * we mark updateslot, then wait one beacon before effecting
421 * the change. This gives associated stations at least one
422 * beacon interval to note the state change.
424 * NB: The slot time change state machine is clocked according
425 * to whether we are bursting or staggering beacons. We
426 * recognize the request to update and record the current
427 * slot then don't transition until that slot is reached
428 * again. If we miss a beacon for that slot then we'll be
429 * slow to transition but we'll be sure at least one beacon
430 * interval has passed. When bursting slot is always left
431 * set to ATH_BCBUF so this check is a noop.
433 if (sc->beacon.updateslot == UPDATE) {
434 sc->beacon.updateslot = COMMIT; /* commit next beacon */
435 sc->beacon.slotupdate = slot;
436 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
437 ah->slottime = sc->beacon.slottime;
438 ath9k_hw_init_global_settings(ah);
439 sc->beacon.updateslot = OK;
443 * Stop any current dma and put the new frame(s) on the queue.
444 * This should never fail since we check above that no frames
445 * are still pending on the queue.
447 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
448 ath_print(common, ATH_DBG_FATAL,
449 "beacon queue %u did not stop?\n", sc->beacon.beaconq);
452 /* NB: cabq traffic should already be queued and primed */
453 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
454 ath9k_hw_txstart(ah, sc->beacon.beaconq);
456 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
460 static void ath9k_beacon_init(struct ath_softc *sc,
464 if (beacon_period & ATH9K_BEACON_RESET_TSF)
467 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
469 if (beacon_period & ATH9K_BEACON_RESET_TSF)
470 ath9k_ps_restore(sc);
474 * For multi-bss ap support beacons are either staggered evenly over N slots or
475 * burst together. For the former arrange for the SWBA to be delivered for each
476 * slot. Slots that are not occupied will generate nothing.
478 static void ath_beacon_config_ap(struct ath_softc *sc,
479 struct ath_beacon_config *conf)
481 struct ath_hw *ah = sc->sc_ah;
482 u32 nexttbtt, intval;
484 /* NB: the beacon interval is kept internally in TU's */
485 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
486 intval /= ATH_BCBUF; /* for staggered beacons */
489 if (sc->sc_flags & SC_OP_TSF_RESET)
490 intval |= ATH9K_BEACON_RESET_TSF;
493 * In AP mode we enable the beacon timers and SWBA interrupts to
494 * prepare beacon frames.
496 intval |= ATH9K_BEACON_ENA;
497 ah->imask |= ATH9K_INT_SWBA;
498 ath_beaconq_config(sc);
500 /* Set the computed AP beacon timers */
502 ath9k_hw_set_interrupts(ah, 0);
503 ath9k_beacon_init(sc, nexttbtt, intval);
504 sc->beacon.bmisscnt = 0;
505 ath9k_hw_set_interrupts(ah, ah->imask);
507 /* Clear the reset TSF flag, so that subsequent beacon updation
508 will not reset the HW TSF. */
510 sc->sc_flags &= ~SC_OP_TSF_RESET;
514 * This sets up the beacon timers according to the timestamp of the last
515 * received beacon and the current TSF, configures PCF and DTIM
516 * handling, programs the sleep registers so the hardware will wakeup in
517 * time to receive beacons, and configures the beacon miss handling so
518 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
519 * we've associated with.
521 static void ath_beacon_config_sta(struct ath_softc *sc,
522 struct ath_beacon_config *conf)
524 struct ath_hw *ah = sc->sc_ah;
525 struct ath_common *common = ath9k_hw_common(ah);
526 struct ath9k_beacon_state bs;
527 int dtimperiod, dtimcount, sleepduration;
528 int cfpperiod, cfpcount;
529 u32 nexttbtt = 0, intval, tsftu;
531 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
533 /* No need to configure beacon if we are not associated */
534 if (!common->curaid) {
535 ath_print(common, ATH_DBG_BEACON,
536 "STA is not yet associated..skipping beacon config\n");
540 memset(&bs, 0, sizeof(bs));
541 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
544 * Setup dtim and cfp parameters according to
545 * last beacon we received (which may be none).
547 dtimperiod = conf->dtim_period;
548 if (dtimperiod <= 0) /* NB: 0 if not known */
550 dtimcount = conf->dtim_count;
551 if (dtimcount >= dtimperiod) /* NB: sanity check */
553 cfpperiod = 1; /* NB: no PCF support yet */
556 sleepduration = conf->listen_interval * intval;
557 if (sleepduration <= 0)
558 sleepduration = intval;
561 * Pull nexttbtt forward to reflect the current
562 * TSF and calculate dtim+cfp state for the result.
564 tsf = ath9k_hw_gettsf64(ah);
565 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
567 num_beacons = tsftu / intval + 1;
568 offset = tsftu % intval;
569 nexttbtt = tsftu - offset;
573 /* DTIM Beacon every dtimperiod Beacon */
574 dtim_dec_count = num_beacons % dtimperiod;
575 /* CFP every cfpperiod DTIM Beacon */
576 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
580 dtimcount -= dtim_dec_count;
582 dtimcount += dtimperiod;
584 cfpcount -= cfp_dec_count;
586 cfpcount += cfpperiod;
588 bs.bs_intval = intval;
589 bs.bs_nexttbtt = nexttbtt;
590 bs.bs_dtimperiod = dtimperiod*intval;
591 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
592 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
593 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
594 bs.bs_cfpmaxduration = 0;
597 * Calculate the number of consecutive beacons to miss* before taking
598 * a BMISS interrupt. The configuration is specified in TU so we only
599 * need calculate based on the beacon interval. Note that we clamp the
600 * result to at most 15 beacons.
602 if (sleepduration > intval) {
603 bs.bs_bmissthreshold = conf->listen_interval *
604 ATH_DEFAULT_BMISS_LIMIT / 2;
606 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
607 if (bs.bs_bmissthreshold > 15)
608 bs.bs_bmissthreshold = 15;
609 else if (bs.bs_bmissthreshold <= 0)
610 bs.bs_bmissthreshold = 1;
614 * Calculate sleep duration. The configuration is given in ms.
615 * We ensure a multiple of the beacon period is used. Also, if the sleep
616 * duration is greater than the DTIM period then it makes senses
617 * to make it a multiple of that.
622 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
623 if (bs.bs_sleepduration > bs.bs_dtimperiod)
624 bs.bs_sleepduration = bs.bs_dtimperiod;
626 /* TSF out of range threshold fixed at 1 second */
627 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
629 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
630 ath_print(common, ATH_DBG_BEACON,
631 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
632 bs.bs_bmissthreshold, bs.bs_sleepduration,
633 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
635 /* Set the computed STA beacon timers */
637 ath9k_hw_set_interrupts(ah, 0);
638 ath9k_hw_set_sta_beacon_timers(ah, &bs);
639 ah->imask |= ATH9K_INT_BMISS;
640 ath9k_hw_set_interrupts(ah, ah->imask);
643 static void ath_beacon_config_adhoc(struct ath_softc *sc,
644 struct ath_beacon_config *conf,
645 struct ieee80211_vif *vif)
647 struct ath_hw *ah = sc->sc_ah;
648 struct ath_common *common = ath9k_hw_common(ah);
650 u32 tsftu, intval, nexttbtt;
652 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
655 /* Pull nexttbtt forward to reflect the current TSF */
657 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
661 nexttbtt = roundup(nexttbtt, intval);
663 tsf = ath9k_hw_gettsf64(ah);
664 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
667 } while (nexttbtt < tsftu);
669 ath_print(common, ATH_DBG_BEACON,
670 "IBSS nexttbtt %u intval %u (%u)\n",
671 nexttbtt, intval, conf->beacon_interval);
674 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
675 * if we need to manually prepare beacon frames. Otherwise we use a
676 * self-linked tx descriptor and let the hardware deal with things.
678 intval |= ATH9K_BEACON_ENA;
679 ah->imask |= ATH9K_INT_SWBA;
681 ath_beaconq_config(sc);
683 /* Set the computed ADHOC beacon timers */
685 ath9k_hw_set_interrupts(ah, 0);
686 ath9k_beacon_init(sc, nexttbtt, intval);
687 sc->beacon.bmisscnt = 0;
688 ath9k_hw_set_interrupts(ah, ah->imask);
691 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
693 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
694 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
695 enum nl80211_iftype iftype;
697 /* Setup the beacon configuration parameters */
699 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
703 cur_conf->beacon_interval = bss_conf->beacon_int;
704 cur_conf->dtim_period = bss_conf->dtim_period;
705 cur_conf->listen_interval = 1;
706 cur_conf->dtim_count = 1;
707 cur_conf->bmiss_timeout =
708 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
710 iftype = sc->sc_ah->opmode;
714 * It looks like mac80211 may end up using beacon interval of zero in
715 * some cases (at least for mesh point). Avoid getting into an
716 * infinite loop by using a bit safer value instead. To be safe,
717 * do sanity check on beacon interval for all operating modes.
719 if (cur_conf->beacon_interval == 0)
720 cur_conf->beacon_interval = 100;
723 case NL80211_IFTYPE_AP:
724 ath_beacon_config_ap(sc, cur_conf);
726 case NL80211_IFTYPE_ADHOC:
727 case NL80211_IFTYPE_MESH_POINT:
728 ath_beacon_config_adhoc(sc, cur_conf, vif);
730 case NL80211_IFTYPE_STATION:
731 ath_beacon_config_sta(sc, cur_conf);
734 ath_print(common, ATH_DBG_CONFIG,
735 "Unsupported beaconing mode\n");
739 sc->sc_flags |= SC_OP_BEACONS;