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)) {
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 = 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_print(common, ATH_DBG_FATAL,
193 "dma_mapping_error on beaconing\n");
197 skb = ieee80211_get_buffered_bc(hw, vif);
200 * if the CABQ traffic from previous DTIM is pending and the current
201 * beacon is also a DTIM.
202 * 1) if there is only one vif let the cab traffic continue.
203 * 2) if there are more than one vif and we are using staggered
204 * beacons, then drain the cabq by dropping all the frames in
205 * the cabq so that the current vifs cab traffic can be scheduled.
207 spin_lock_bh(&cabq->axq_lock);
208 cabq_depth = cabq->axq_depth;
209 spin_unlock_bh(&cabq->axq_lock);
211 if (skb && cabq_depth) {
213 ath_print(common, ATH_DBG_BEACON,
214 "Flushing previous cabq traffic\n");
215 ath_draintxq(sc, cabq, false);
219 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
222 ath_tx_cabq(hw, skb);
223 skb = ieee80211_get_buffered_bc(hw, vif);
229 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
231 struct ath_softc *sc = aphy->sc;
232 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
238 avp = (void *)vif->drv_priv;
240 /* Allocate a beacon descriptor if we haven't done so. */
241 if (!avp->av_bcbuf) {
242 /* Allocate beacon state for hostap/ibss. We know
243 * a buffer is available. */
244 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
245 struct ath_buf, list);
246 list_del(&avp->av_bcbuf->list);
248 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
249 sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC ||
250 sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
253 * Assign the vif to a beacon xmit slot. As
254 * above, this cannot fail to find one.
257 for (slot = 0; slot < ATH_BCBUF; slot++)
258 if (sc->beacon.bslot[slot] == NULL) {
259 avp->av_bslot = slot;
261 /* NB: keep looking for a double slot */
262 if (slot == 0 || !sc->beacon.bslot[slot-1])
265 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
266 sc->beacon.bslot[avp->av_bslot] = vif;
267 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
272 /* release the previous beacon frame, if it already exists. */
274 if (bf->bf_mpdu != NULL) {
276 dma_unmap_single(sc->dev, bf->bf_buf_addr,
277 skb->len, DMA_TO_DEVICE);
278 dev_kfree_skb_any(skb);
283 /* NB: the beacon data buffer must be 32-bit aligned. */
284 skb = ieee80211_beacon_get(sc->hw, vif);
286 ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
290 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
291 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
292 /* Calculate a TSF adjustment factor required for staggered beacons. */
293 if (avp->av_bslot > 0) {
297 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
300 * Calculate the TSF offset for this beacon slot, i.e., the
301 * number of usecs that need to be added to the timestamp field
302 * in Beacon and Probe Response frames. Beacon slot 0 is
303 * processed at the correct offset, so it does not require TSF
304 * adjustment. Other slots are adjusted to get the timestamp
305 * close to the TBTT for the BSS.
307 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
308 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
310 ath_print(common, ATH_DBG_BEACON,
311 "stagger beacons, bslot %d intval "
312 "%u tsfadjust %llu\n",
313 avp->av_bslot, intval, (unsigned long long)tsfadjust);
315 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
318 avp->tsf_adjust = cpu_to_le64(0);
321 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
322 skb->len, DMA_TO_DEVICE);
323 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
324 dev_kfree_skb_any(skb);
327 ath_print(common, ATH_DBG_FATAL,
328 "dma_mapping_error on beacon alloc\n");
335 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
337 if (avp->av_bcbuf != NULL) {
340 if (avp->av_bslot != -1) {
341 sc->beacon.bslot[avp->av_bslot] = NULL;
342 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
347 if (bf->bf_mpdu != NULL) {
348 struct sk_buff *skb = bf->bf_mpdu;
349 dma_unmap_single(sc->dev, bf->bf_buf_addr,
350 skb->len, DMA_TO_DEVICE);
351 dev_kfree_skb_any(skb);
355 list_add_tail(&bf->list, &sc->beacon.bbuf);
357 avp->av_bcbuf = NULL;
361 void ath_beacon_tasklet(unsigned long data)
363 struct ath_softc *sc = (struct ath_softc *)data;
364 struct ath_hw *ah = sc->sc_ah;
365 struct ath_common *common = ath9k_hw_common(ah);
366 struct ath_buf *bf = NULL;
367 struct ieee80211_vif *vif;
368 struct ath_wiphy *aphy;
370 u32 bfaddr, bc = 0, tsftu;
375 * Check if the previous beacon has gone out. If
376 * not don't try to post another, skip this period
377 * and wait for the next. Missed beacons indicate
378 * a problem and should not occur. If we miss too
379 * many consecutive beacons reset the device.
381 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
382 sc->beacon.bmisscnt++;
384 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
385 ath_print(common, ATH_DBG_BSTUCK,
386 "missed %u consecutive beacons\n",
387 sc->beacon.bmisscnt);
388 ath9k_hw_bstuck_nfcal(ah);
389 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
390 ath_print(common, ATH_DBG_BSTUCK,
391 "beacon is officially stuck\n");
392 sc->sc_flags |= SC_OP_TSF_RESET;
399 if (sc->beacon.bmisscnt != 0) {
400 ath_print(common, ATH_DBG_BSTUCK,
401 "resume beacon xmit after %u misses\n",
402 sc->beacon.bmisscnt);
403 sc->beacon.bmisscnt = 0;
407 * Generate beacon frames. we are sending frames
408 * staggered so calculate the slot for this frame based
409 * on the tsf to safeguard against missing an swba.
412 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
414 tsf = ath9k_hw_gettsf64(ah);
415 tsftu = TSF_TO_TU(tsf>>32, tsf);
416 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
418 * Reverse the slot order to get slot 0 on the TBTT offset that does
419 * not require TSF adjustment and other slots adding
420 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
421 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
422 * and slot 0 is at correct offset to TBTT.
424 slot = ATH_BCBUF - slot - 1;
425 vif = sc->beacon.bslot[slot];
426 aphy = sc->beacon.bslot_aphy[slot];
428 ath_print(common, ATH_DBG_BEACON,
429 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
430 slot, tsf, tsftu, intval, vif);
434 bf = ath_beacon_generate(aphy->hw, vif);
436 bfaddr = bf->bf_daddr;
442 * Handle slot time change when a non-ERP station joins/leaves
443 * an 11g network. The 802.11 layer notifies us via callback,
444 * we mark updateslot, then wait one beacon before effecting
445 * the change. This gives associated stations at least one
446 * beacon interval to note the state change.
448 * NB: The slot time change state machine is clocked according
449 * to whether we are bursting or staggering beacons. We
450 * recognize the request to update and record the current
451 * slot then don't transition until that slot is reached
452 * again. If we miss a beacon for that slot then we'll be
453 * slow to transition but we'll be sure at least one beacon
454 * interval has passed. When bursting slot is always left
455 * set to ATH_BCBUF so this check is a noop.
457 if (sc->beacon.updateslot == UPDATE) {
458 sc->beacon.updateslot = COMMIT; /* commit next beacon */
459 sc->beacon.slotupdate = slot;
460 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
461 ah->slottime = sc->beacon.slottime;
462 ath9k_hw_init_global_settings(ah);
463 sc->beacon.updateslot = OK;
467 * Stop any current dma and put the new frame(s) on the queue.
468 * This should never fail since we check above that no frames
469 * are still pending on the queue.
471 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
472 ath_print(common, ATH_DBG_FATAL,
473 "beacon queue %u did not stop?\n", sc->beacon.beaconq);
476 /* NB: cabq traffic should already be queued and primed */
477 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
478 ath9k_hw_txstart(ah, sc->beacon.beaconq);
480 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
484 static void ath9k_beacon_init(struct ath_softc *sc,
488 if (beacon_period & ATH9K_BEACON_RESET_TSF)
491 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
493 if (beacon_period & ATH9K_BEACON_RESET_TSF)
494 ath9k_ps_restore(sc);
498 * For multi-bss ap support beacons are either staggered evenly over N slots or
499 * burst together. For the former arrange for the SWBA to be delivered for each
500 * slot. Slots that are not occupied will generate nothing.
502 static void ath_beacon_config_ap(struct ath_softc *sc,
503 struct ath_beacon_config *conf)
505 struct ath_hw *ah = sc->sc_ah;
506 u32 nexttbtt, intval;
508 /* NB: the beacon interval is kept internally in TU's */
509 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
510 intval /= ATH_BCBUF; /* for staggered beacons */
513 if (sc->sc_flags & SC_OP_TSF_RESET)
514 intval |= ATH9K_BEACON_RESET_TSF;
517 * In AP mode we enable the beacon timers and SWBA interrupts to
518 * prepare beacon frames.
520 intval |= ATH9K_BEACON_ENA;
521 ah->imask |= ATH9K_INT_SWBA;
522 ath_beaconq_config(sc);
524 /* Set the computed AP beacon timers */
526 ath9k_hw_disable_interrupts(ah);
527 ath9k_beacon_init(sc, nexttbtt, intval);
528 sc->beacon.bmisscnt = 0;
529 ath9k_hw_set_interrupts(ah, ah->imask);
531 /* Clear the reset TSF flag, so that subsequent beacon updation
532 will not reset the HW TSF. */
534 sc->sc_flags &= ~SC_OP_TSF_RESET;
538 * This sets up the beacon timers according to the timestamp of the last
539 * received beacon and the current TSF, configures PCF and DTIM
540 * handling, programs the sleep registers so the hardware will wakeup in
541 * time to receive beacons, and configures the beacon miss handling so
542 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
543 * we've associated with.
545 static void ath_beacon_config_sta(struct ath_softc *sc,
546 struct ath_beacon_config *conf)
548 struct ath_hw *ah = sc->sc_ah;
549 struct ath_common *common = ath9k_hw_common(ah);
550 struct ath9k_beacon_state bs;
551 int dtimperiod, dtimcount, sleepduration;
552 int cfpperiod, cfpcount;
553 u32 nexttbtt = 0, intval, tsftu;
555 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
557 /* No need to configure beacon if we are not associated */
558 if (!common->curaid) {
559 ath_print(common, ATH_DBG_BEACON,
560 "STA is not yet associated..skipping beacon config\n");
564 memset(&bs, 0, sizeof(bs));
565 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
568 * Setup dtim and cfp parameters according to
569 * last beacon we received (which may be none).
571 dtimperiod = conf->dtim_period;
572 if (dtimperiod <= 0) /* NB: 0 if not known */
574 dtimcount = conf->dtim_count;
575 if (dtimcount >= dtimperiod) /* NB: sanity check */
577 cfpperiod = 1; /* NB: no PCF support yet */
580 sleepduration = conf->listen_interval * intval;
581 if (sleepduration <= 0)
582 sleepduration = intval;
585 * Pull nexttbtt forward to reflect the current
586 * TSF and calculate dtim+cfp state for the result.
588 tsf = ath9k_hw_gettsf64(ah);
589 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
591 num_beacons = tsftu / intval + 1;
592 offset = tsftu % intval;
593 nexttbtt = tsftu - offset;
597 /* DTIM Beacon every dtimperiod Beacon */
598 dtim_dec_count = num_beacons % dtimperiod;
599 /* CFP every cfpperiod DTIM Beacon */
600 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
604 dtimcount -= dtim_dec_count;
606 dtimcount += dtimperiod;
608 cfpcount -= cfp_dec_count;
610 cfpcount += cfpperiod;
612 bs.bs_intval = intval;
613 bs.bs_nexttbtt = nexttbtt;
614 bs.bs_dtimperiod = dtimperiod*intval;
615 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
616 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
617 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
618 bs.bs_cfpmaxduration = 0;
621 * Calculate the number of consecutive beacons to miss* before taking
622 * a BMISS interrupt. The configuration is specified in TU so we only
623 * need calculate based on the beacon interval. Note that we clamp the
624 * result to at most 15 beacons.
626 if (sleepduration > intval) {
627 bs.bs_bmissthreshold = conf->listen_interval *
628 ATH_DEFAULT_BMISS_LIMIT / 2;
630 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
631 if (bs.bs_bmissthreshold > 15)
632 bs.bs_bmissthreshold = 15;
633 else if (bs.bs_bmissthreshold <= 0)
634 bs.bs_bmissthreshold = 1;
638 * Calculate sleep duration. The configuration is given in ms.
639 * We ensure a multiple of the beacon period is used. Also, if the sleep
640 * duration is greater than the DTIM period then it makes senses
641 * to make it a multiple of that.
646 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
647 if (bs.bs_sleepduration > bs.bs_dtimperiod)
648 bs.bs_sleepduration = bs.bs_dtimperiod;
650 /* TSF out of range threshold fixed at 1 second */
651 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
653 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
654 ath_print(common, ATH_DBG_BEACON,
655 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
656 bs.bs_bmissthreshold, bs.bs_sleepduration,
657 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
659 /* Set the computed STA beacon timers */
661 ath9k_hw_disable_interrupts(ah);
662 ath9k_hw_set_sta_beacon_timers(ah, &bs);
663 ah->imask |= ATH9K_INT_BMISS;
664 ath9k_hw_set_interrupts(ah, ah->imask);
667 static void ath_beacon_config_adhoc(struct ath_softc *sc,
668 struct ath_beacon_config *conf,
669 struct ieee80211_vif *vif)
671 struct ath_hw *ah = sc->sc_ah;
672 struct ath_common *common = ath9k_hw_common(ah);
674 u32 tsftu, intval, nexttbtt;
676 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
679 /* Pull nexttbtt forward to reflect the current TSF */
681 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
685 nexttbtt = roundup(nexttbtt, intval);
687 tsf = ath9k_hw_gettsf64(ah);
688 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
691 } while (nexttbtt < tsftu);
693 ath_print(common, ATH_DBG_BEACON,
694 "IBSS nexttbtt %u intval %u (%u)\n",
695 nexttbtt, intval, conf->beacon_interval);
698 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
699 * if we need to manually prepare beacon frames. Otherwise we use a
700 * self-linked tx descriptor and let the hardware deal with things.
702 intval |= ATH9K_BEACON_ENA;
703 ah->imask |= ATH9K_INT_SWBA;
705 ath_beaconq_config(sc);
707 /* Set the computed ADHOC beacon timers */
709 ath9k_hw_disable_interrupts(ah);
710 ath9k_beacon_init(sc, nexttbtt, intval);
711 sc->beacon.bmisscnt = 0;
712 ath9k_hw_set_interrupts(ah, ah->imask);
715 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
717 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
718 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
719 enum nl80211_iftype iftype;
721 /* Setup the beacon configuration parameters */
723 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
727 cur_conf->beacon_interval = bss_conf->beacon_int;
728 cur_conf->dtim_period = bss_conf->dtim_period;
729 cur_conf->listen_interval = 1;
730 cur_conf->dtim_count = 1;
731 cur_conf->bmiss_timeout =
732 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
734 iftype = sc->sc_ah->opmode;
738 * It looks like mac80211 may end up using beacon interval of zero in
739 * some cases (at least for mesh point). Avoid getting into an
740 * infinite loop by using a bit safer value instead. To be safe,
741 * do sanity check on beacon interval for all operating modes.
743 if (cur_conf->beacon_interval == 0)
744 cur_conf->beacon_interval = 100;
747 case NL80211_IFTYPE_AP:
748 ath_beacon_config_ap(sc, cur_conf);
750 case NL80211_IFTYPE_ADHOC:
751 case NL80211_IFTYPE_MESH_POINT:
752 ath_beacon_config_adhoc(sc, cur_conf, vif);
754 case NL80211_IFTYPE_STATION:
755 ath_beacon_config_sta(sc, cur_conf);
758 ath_print(common, ATH_DBG_CONFIG,
759 "Unsupported beaconing mode\n");
763 sc->sc_flags |= SC_OP_BEACONS;