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 = ath_tx_get_qnum(sc, ATH9K_TX_QUEUE_DATA,
43 ath9k_hw_get_txq_props(ah, qnum, &qi_be);
44 qi.tqi_aifs = qi_be.tqi_aifs;
45 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
46 qi.tqi_cwmax = qi_be.tqi_cwmax;
49 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
50 ath_print(common, ATH_DBG_FATAL,
51 "Unable to update h/w beacon queue parameters\n");
54 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
60 * Associates the beacon frame buffer with a transmit descriptor. Will set
61 * up all required antenna switch parameters, rate codes, and channel flags.
62 * Beacons are always sent out at the lowest rate, and are not retried.
64 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
65 struct ath_buf *bf, int rateidx)
67 struct sk_buff *skb = bf->bf_mpdu;
68 struct ath_hw *ah = sc->sc_ah;
69 struct ath_common *common = ath9k_hw_common(ah);
71 struct ath9k_11n_rate_series series[4];
72 int flags, antenna, ctsrate = 0, ctsduration = 0;
73 struct ieee80211_supported_band *sband;
77 flags = ATH9K_TXDESC_NOACK;
79 if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) ||
80 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) &&
81 (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
82 ds->ds_link = bf->bf_daddr; /* self-linked */
83 flags |= ATH9K_TXDESC_VEOL;
84 /* Let hardware handle antenna switching. */
89 * Switch antenna every beacon.
90 * Should only switch every beacon period, not for every SWBA
91 * XXX assumes two antennae
93 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
96 sband = &sc->sbands[common->hw->conf.channel->band];
97 rate = sband->bitrates[rateidx].hw_value;
98 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
99 rate |= sband->bitrates[rateidx].hw_value_short;
101 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
102 ATH9K_PKT_TYPE_BEACON,
104 ATH9K_TXKEYIX_INVALID,
105 ATH9K_KEY_TYPE_CLEAR,
108 /* NB: beacon's BufLen must be a multiple of 4 bytes */
109 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
110 true, true, ds, bf->bf_buf_addr,
113 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
115 series[0].Rate = rate;
116 series[0].ChSel = common->tx_chainmask;
117 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
118 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
122 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
123 struct ieee80211_vif *vif)
125 struct ath_wiphy *aphy = hw->priv;
126 struct ath_softc *sc = aphy->sc;
127 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
131 struct ath_txq *cabq;
132 struct ieee80211_tx_info *info;
135 if (aphy->state != ATH_WIPHY_ACTIVE)
138 avp = (void *)vif->drv_priv;
139 cabq = sc->beacon.cabq;
141 if (avp->av_bcbuf == NULL)
144 /* Release the old beacon first */
149 dma_unmap_single(sc->dev, bf->bf_dmacontext,
150 skb->len, DMA_TO_DEVICE);
151 dev_kfree_skb_any(skb);
154 /* Get a new beacon from mac80211 */
156 skb = ieee80211_beacon_get(hw, vif);
160 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
163 info = IEEE80211_SKB_CB(skb);
164 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
166 * TODO: make sure the seq# gets assigned properly (vs. other
169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
170 sc->tx.seq_no += 0x10;
171 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
172 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
175 bf->bf_buf_addr = bf->bf_dmacontext =
176 dma_map_single(sc->dev, skb->data,
177 skb->len, DMA_TO_DEVICE);
178 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
179 dev_kfree_skb_any(skb);
181 ath_print(common, ATH_DBG_FATAL,
182 "dma_mapping_error on beaconing\n");
186 skb = ieee80211_get_buffered_bc(hw, vif);
189 * if the CABQ traffic from previous DTIM is pending and the current
190 * beacon is also a DTIM.
191 * 1) if there is only one vif let the cab traffic continue.
192 * 2) if there are more than one vif and we are using staggered
193 * beacons, then drain the cabq by dropping all the frames in
194 * the cabq so that the current vifs cab traffic can be scheduled.
196 spin_lock_bh(&cabq->axq_lock);
197 cabq_depth = cabq->axq_depth;
198 spin_unlock_bh(&cabq->axq_lock);
200 if (skb && cabq_depth) {
202 ath_print(common, ATH_DBG_BEACON,
203 "Flushing previous cabq traffic\n");
204 ath_draintxq(sc, cabq, false);
208 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
211 ath_tx_cabq(hw, skb);
212 skb = ieee80211_get_buffered_bc(hw, vif);
219 * Startup beacon transmission for adhoc mode when they are sent entirely
220 * by the hardware using the self-linked descriptor + veol trick.
222 static void ath_beacon_start_adhoc(struct ath_softc *sc,
223 struct ieee80211_vif *vif)
225 struct ath_hw *ah = sc->sc_ah;
226 struct ath_common *common = ath9k_hw_common(ah);
231 avp = (void *)vif->drv_priv;
233 if (avp->av_bcbuf == NULL)
239 ath_beacon_setup(sc, avp, bf, 0);
241 /* NB: caller is known to have already stopped tx dma */
242 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
243 ath9k_hw_txstart(ah, sc->beacon.beaconq);
244 ath_print(common, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n",
245 sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc);
248 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
250 struct ath_softc *sc = aphy->sc;
251 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
257 avp = (void *)vif->drv_priv;
259 /* Allocate a beacon descriptor if we haven't done so. */
260 if (!avp->av_bcbuf) {
261 /* Allocate beacon state for hostap/ibss. We know
262 * a buffer is available. */
263 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
264 struct ath_buf, list);
265 list_del(&avp->av_bcbuf->list);
267 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
268 !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
271 * Assign the vif to a beacon xmit slot. As
272 * above, this cannot fail to find one.
275 for (slot = 0; slot < ATH_BCBUF; slot++)
276 if (sc->beacon.bslot[slot] == NULL) {
277 avp->av_bslot = slot;
279 /* NB: keep looking for a double slot */
280 if (slot == 0 || !sc->beacon.bslot[slot-1])
283 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
284 sc->beacon.bslot[avp->av_bslot] = vif;
285 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
290 /* release the previous beacon frame, if it already exists. */
292 if (bf->bf_mpdu != NULL) {
294 dma_unmap_single(sc->dev, bf->bf_dmacontext,
295 skb->len, DMA_TO_DEVICE);
296 dev_kfree_skb_any(skb);
300 /* NB: the beacon data buffer must be 32-bit aligned. */
301 skb = ieee80211_beacon_get(sc->hw, vif);
303 ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
307 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
308 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
309 /* Calculate a TSF adjustment factor required for staggered beacons. */
310 if (avp->av_bslot > 0) {
314 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
317 * Calculate the TSF offset for this beacon slot, i.e., the
318 * number of usecs that need to be added to the timestamp field
319 * in Beacon and Probe Response frames. Beacon slot 0 is
320 * processed at the correct offset, so it does not require TSF
321 * adjustment. Other slots are adjusted to get the timestamp
322 * close to the TBTT for the BSS.
324 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
325 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
327 ath_print(common, ATH_DBG_BEACON,
328 "stagger beacons, bslot %d intval "
329 "%u tsfadjust %llu\n",
330 avp->av_bslot, intval, (unsigned long long)tsfadjust);
332 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
335 avp->tsf_adjust = cpu_to_le64(0);
338 bf->bf_buf_addr = bf->bf_dmacontext =
339 dma_map_single(sc->dev, skb->data,
340 skb->len, DMA_TO_DEVICE);
341 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
342 dev_kfree_skb_any(skb);
344 ath_print(common, ATH_DBG_FATAL,
345 "dma_mapping_error on beacon alloc\n");
352 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
354 if (avp->av_bcbuf != NULL) {
357 if (avp->av_bslot != -1) {
358 sc->beacon.bslot[avp->av_bslot] = NULL;
359 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
364 if (bf->bf_mpdu != NULL) {
365 struct sk_buff *skb = bf->bf_mpdu;
366 dma_unmap_single(sc->dev, bf->bf_dmacontext,
367 skb->len, DMA_TO_DEVICE);
368 dev_kfree_skb_any(skb);
371 list_add_tail(&bf->list, &sc->beacon.bbuf);
373 avp->av_bcbuf = NULL;
377 void ath_beacon_tasklet(unsigned long data)
379 struct ath_softc *sc = (struct ath_softc *)data;
380 struct ath_hw *ah = sc->sc_ah;
381 struct ath_common *common = ath9k_hw_common(ah);
382 struct ath_buf *bf = NULL;
383 struct ieee80211_vif *vif;
384 struct ath_wiphy *aphy;
386 u32 bfaddr, bc = 0, tsftu;
391 * Check if the previous beacon has gone out. If
392 * not don't try to post another, skip this period
393 * and wait for the next. Missed beacons indicate
394 * a problem and should not occur. If we miss too
395 * many consecutive beacons reset the device.
397 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
398 sc->beacon.bmisscnt++;
400 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
401 ath_print(common, ATH_DBG_BEACON,
402 "missed %u consecutive beacons\n",
403 sc->beacon.bmisscnt);
404 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
405 ath_print(common, ATH_DBG_BEACON,
406 "beacon is officially stuck\n");
407 sc->sc_flags |= SC_OP_TSF_RESET;
408 ath_reset(sc, false);
414 if (sc->beacon.bmisscnt != 0) {
415 ath_print(common, ATH_DBG_BEACON,
416 "resume beacon xmit after %u misses\n",
417 sc->beacon.bmisscnt);
418 sc->beacon.bmisscnt = 0;
422 * Generate beacon frames. we are sending frames
423 * staggered so calculate the slot for this frame based
424 * on the tsf to safeguard against missing an swba.
427 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
429 tsf = ath9k_hw_gettsf64(ah);
430 tsftu = TSF_TO_TU(tsf>>32, tsf);
431 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
433 * Reverse the slot order to get slot 0 on the TBTT offset that does
434 * not require TSF adjustment and other slots adding
435 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
436 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
437 * and slot 0 is at correct offset to TBTT.
439 slot = ATH_BCBUF - slot - 1;
440 vif = sc->beacon.bslot[slot];
441 aphy = sc->beacon.bslot_aphy[slot];
443 ath_print(common, ATH_DBG_BEACON,
444 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
445 slot, tsf, tsftu, intval, vif);
449 bf = ath_beacon_generate(aphy->hw, vif);
451 bfaddr = bf->bf_daddr;
457 * Handle slot time change when a non-ERP station joins/leaves
458 * an 11g network. The 802.11 layer notifies us via callback,
459 * we mark updateslot, then wait one beacon before effecting
460 * the change. This gives associated stations at least one
461 * beacon interval to note the state change.
463 * NB: The slot time change state machine is clocked according
464 * to whether we are bursting or staggering beacons. We
465 * recognize the request to update and record the current
466 * slot then don't transition until that slot is reached
467 * again. If we miss a beacon for that slot then we'll be
468 * slow to transition but we'll be sure at least one beacon
469 * interval has passed. When bursting slot is always left
470 * set to ATH_BCBUF so this check is a noop.
472 if (sc->beacon.updateslot == UPDATE) {
473 sc->beacon.updateslot = COMMIT; /* commit next beacon */
474 sc->beacon.slotupdate = slot;
475 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
476 ah->slottime = sc->beacon.slottime;
477 ath9k_hw_init_global_settings(ah);
478 sc->beacon.updateslot = OK;
482 * Stop any current dma and put the new frame(s) on the queue.
483 * This should never fail since we check above that no frames
484 * are still pending on the queue.
486 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
487 ath_print(common, ATH_DBG_FATAL,
488 "beacon queue %u did not stop?\n", sc->beacon.beaconq);
491 /* NB: cabq traffic should already be queued and primed */
492 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
493 ath9k_hw_txstart(ah, sc->beacon.beaconq);
495 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
499 static void ath9k_beacon_init(struct ath_softc *sc,
503 if (beacon_period & ATH9K_BEACON_RESET_TSF)
506 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
508 if (beacon_period & ATH9K_BEACON_RESET_TSF)
509 ath9k_ps_restore(sc);
513 * For multi-bss ap support beacons are either staggered evenly over N slots or
514 * burst together. For the former arrange for the SWBA to be delivered for each
515 * slot. Slots that are not occupied will generate nothing.
517 static void ath_beacon_config_ap(struct ath_softc *sc,
518 struct ath_beacon_config *conf)
520 struct ath_hw *ah = sc->sc_ah;
521 u32 nexttbtt, intval;
523 /* NB: the beacon interval is kept internally in TU's */
524 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
525 intval /= ATH_BCBUF; /* for staggered beacons */
528 if (sc->sc_flags & SC_OP_TSF_RESET)
529 intval |= ATH9K_BEACON_RESET_TSF;
532 * In AP mode we enable the beacon timers and SWBA interrupts to
533 * prepare beacon frames.
535 intval |= ATH9K_BEACON_ENA;
536 ah->imask |= ATH9K_INT_SWBA;
537 ath_beaconq_config(sc);
539 /* Set the computed AP beacon timers */
541 ath9k_hw_set_interrupts(ah, 0);
542 ath9k_beacon_init(sc, nexttbtt, intval);
543 sc->beacon.bmisscnt = 0;
544 ath9k_hw_set_interrupts(ah, ah->imask);
546 /* Clear the reset TSF flag, so that subsequent beacon updation
547 will not reset the HW TSF. */
549 sc->sc_flags &= ~SC_OP_TSF_RESET;
553 * This sets up the beacon timers according to the timestamp of the last
554 * received beacon and the current TSF, configures PCF and DTIM
555 * handling, programs the sleep registers so the hardware will wakeup in
556 * time to receive beacons, and configures the beacon miss handling so
557 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
558 * we've associated with.
560 static void ath_beacon_config_sta(struct ath_softc *sc,
561 struct ath_beacon_config *conf)
563 struct ath_hw *ah = sc->sc_ah;
564 struct ath_common *common = ath9k_hw_common(ah);
565 struct ath9k_beacon_state bs;
566 int dtimperiod, dtimcount, sleepduration;
567 int cfpperiod, cfpcount;
568 u32 nexttbtt = 0, intval, tsftu;
570 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
572 /* No need to configure beacon if we are not associated */
573 if (!common->curaid) {
574 ath_print(common, ATH_DBG_BEACON,
575 "STA is not yet associated..skipping beacon config\n");
579 memset(&bs, 0, sizeof(bs));
580 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
583 * Setup dtim and cfp parameters according to
584 * last beacon we received (which may be none).
586 dtimperiod = conf->dtim_period;
587 if (dtimperiod <= 0) /* NB: 0 if not known */
589 dtimcount = conf->dtim_count;
590 if (dtimcount >= dtimperiod) /* NB: sanity check */
592 cfpperiod = 1; /* NB: no PCF support yet */
595 sleepduration = conf->listen_interval * intval;
596 if (sleepduration <= 0)
597 sleepduration = intval;
600 * Pull nexttbtt forward to reflect the current
601 * TSF and calculate dtim+cfp state for the result.
603 tsf = ath9k_hw_gettsf64(ah);
604 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
606 num_beacons = tsftu / intval + 1;
607 offset = tsftu % intval;
608 nexttbtt = tsftu - offset;
612 /* DTIM Beacon every dtimperiod Beacon */
613 dtim_dec_count = num_beacons % dtimperiod;
614 /* CFP every cfpperiod DTIM Beacon */
615 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
619 dtimcount -= dtim_dec_count;
621 dtimcount += dtimperiod;
623 cfpcount -= cfp_dec_count;
625 cfpcount += cfpperiod;
627 bs.bs_intval = intval;
628 bs.bs_nexttbtt = nexttbtt;
629 bs.bs_dtimperiod = dtimperiod*intval;
630 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
631 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
632 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
633 bs.bs_cfpmaxduration = 0;
636 * Calculate the number of consecutive beacons to miss* before taking
637 * a BMISS interrupt. The configuration is specified in TU so we only
638 * need calculate based on the beacon interval. Note that we clamp the
639 * result to at most 15 beacons.
641 if (sleepduration > intval) {
642 bs.bs_bmissthreshold = conf->listen_interval *
643 ATH_DEFAULT_BMISS_LIMIT / 2;
645 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
646 if (bs.bs_bmissthreshold > 15)
647 bs.bs_bmissthreshold = 15;
648 else if (bs.bs_bmissthreshold <= 0)
649 bs.bs_bmissthreshold = 1;
653 * Calculate sleep duration. The configuration is given in ms.
654 * We ensure a multiple of the beacon period is used. Also, if the sleep
655 * duration is greater than the DTIM period then it makes senses
656 * to make it a multiple of that.
661 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
662 if (bs.bs_sleepduration > bs.bs_dtimperiod)
663 bs.bs_sleepduration = bs.bs_dtimperiod;
665 /* TSF out of range threshold fixed at 1 second */
666 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
668 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
669 ath_print(common, ATH_DBG_BEACON,
670 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
671 bs.bs_bmissthreshold, bs.bs_sleepduration,
672 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
674 /* Set the computed STA beacon timers */
676 ath9k_hw_set_interrupts(ah, 0);
677 ath9k_hw_set_sta_beacon_timers(ah, &bs);
678 ah->imask |= ATH9K_INT_BMISS;
679 ath9k_hw_set_interrupts(ah, ah->imask);
682 static void ath_beacon_config_adhoc(struct ath_softc *sc,
683 struct ath_beacon_config *conf,
684 struct ieee80211_vif *vif)
686 struct ath_hw *ah = sc->sc_ah;
687 struct ath_common *common = ath9k_hw_common(ah);
689 u32 tsftu, intval, nexttbtt;
691 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
694 /* Pull nexttbtt forward to reflect the current TSF */
696 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
700 nexttbtt = roundup(nexttbtt, intval);
702 tsf = ath9k_hw_gettsf64(ah);
703 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
706 } while (nexttbtt < tsftu);
708 ath_print(common, ATH_DBG_BEACON,
709 "IBSS nexttbtt %u intval %u (%u)\n",
710 nexttbtt, intval, conf->beacon_interval);
713 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
714 * if we need to manually prepare beacon frames. Otherwise we use a
715 * self-linked tx descriptor and let the hardware deal with things.
717 intval |= ATH9K_BEACON_ENA;
718 if (!(ah->caps.hw_caps & ATH9K_HW_CAP_VEOL))
719 ah->imask |= ATH9K_INT_SWBA;
721 ath_beaconq_config(sc);
723 /* Set the computed ADHOC beacon timers */
725 ath9k_hw_set_interrupts(ah, 0);
726 ath9k_beacon_init(sc, nexttbtt, intval);
727 sc->beacon.bmisscnt = 0;
728 ath9k_hw_set_interrupts(ah, ah->imask);
730 /* FIXME: Handle properly when vif is NULL */
731 if (vif && ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)
732 ath_beacon_start_adhoc(sc, vif);
735 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
737 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
738 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
739 enum nl80211_iftype iftype;
741 /* Setup the beacon configuration parameters */
743 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
747 cur_conf->beacon_interval = bss_conf->beacon_int;
748 cur_conf->dtim_period = bss_conf->dtim_period;
749 cur_conf->listen_interval = 1;
750 cur_conf->dtim_count = 1;
751 cur_conf->bmiss_timeout =
752 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
754 iftype = sc->sc_ah->opmode;
758 * It looks like mac80211 may end up using beacon interval of zero in
759 * some cases (at least for mesh point). Avoid getting into an
760 * infinite loop by using a bit safer value instead. To be safe,
761 * do sanity check on beacon interval for all operating modes.
763 if (cur_conf->beacon_interval == 0)
764 cur_conf->beacon_interval = 100;
767 case NL80211_IFTYPE_AP:
768 ath_beacon_config_ap(sc, cur_conf);
770 case NL80211_IFTYPE_ADHOC:
771 case NL80211_IFTYPE_MESH_POINT:
772 ath_beacon_config_adhoc(sc, cur_conf, vif);
774 case NL80211_IFTYPE_STATION:
775 ath_beacon_config_sta(sc, cur_conf);
778 ath_print(common, ATH_DBG_CONFIG,
779 "Unsupported beaconing mode\n");
783 sc->sc_flags |= SC_OP_BEACONS;