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 static 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;
32 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
33 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
34 /* Always burst out beacon and CAB traffic. */
39 /* Adhoc mode; important thing is to use 2x cwmin. */
40 qi.tqi_aifs = sc->beacon.beacon_qi.tqi_aifs;
41 qi.tqi_cwmin = 2*sc->beacon.beacon_qi.tqi_cwmin;
42 qi.tqi_cwmax = sc->beacon.beacon_qi.tqi_cwmax;
45 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
46 ath_print(common, ATH_DBG_FATAL,
47 "Unable to update h/w beacon queue parameters\n");
50 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
56 * Associates the beacon frame buffer with a transmit descriptor. Will set
57 * up all required antenna switch parameters, rate codes, and channel flags.
58 * Beacons are always sent out at the lowest rate, and are not retried.
60 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
63 struct sk_buff *skb = bf->bf_mpdu;
64 struct ath_hw *ah = sc->sc_ah;
65 struct ath_common *common = ath9k_hw_common(ah);
67 struct ath9k_11n_rate_series series[4];
68 const struct ath_rate_table *rt;
69 int flags, antenna, ctsrate = 0, ctsduration = 0;
73 flags = ATH9K_TXDESC_NOACK;
75 if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) ||
76 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) &&
77 (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
78 ds->ds_link = bf->bf_daddr; /* self-linked */
79 flags |= ATH9K_TXDESC_VEOL;
80 /* Let hardware handle antenna switching. */
85 * Switch antenna every beacon.
86 * Should only switch every beacon period, not for every SWBA
87 * XXX assumes two antennae
89 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
92 ds->ds_data = bf->bf_buf_addr;
94 rt = sc->cur_rate_table;
95 rate = rt->info[0].ratecode;
96 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
97 rate |= rt->info[0].short_preamble;
99 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
100 ATH9K_PKT_TYPE_BEACON,
102 ATH9K_TXKEYIX_INVALID,
103 ATH9K_KEY_TYPE_CLEAR,
106 /* NB: beacon's BufLen must be a multiple of 4 bytes */
107 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
110 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
112 series[0].Rate = rate;
113 series[0].ChSel = common->tx_chainmask;
114 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
115 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
119 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
120 struct ieee80211_vif *vif)
122 struct ath_wiphy *aphy = hw->priv;
123 struct ath_softc *sc = aphy->sc;
124 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
128 struct ath_txq *cabq;
129 struct ieee80211_tx_info *info;
132 if (aphy->state != ATH_WIPHY_ACTIVE)
135 avp = (void *)vif->drv_priv;
136 cabq = sc->beacon.cabq;
138 if (avp->av_bcbuf == NULL)
141 /* Release the old beacon first */
146 dma_unmap_single(sc->dev, bf->bf_dmacontext,
147 skb->len, DMA_TO_DEVICE);
148 dev_kfree_skb_any(skb);
151 /* Get a new beacon from mac80211 */
153 skb = ieee80211_beacon_get(hw, vif);
157 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
160 info = IEEE80211_SKB_CB(skb);
161 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
163 * TODO: make sure the seq# gets assigned properly (vs. other
166 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
167 sc->tx.seq_no += 0x10;
168 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
169 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
172 bf->bf_buf_addr = bf->bf_dmacontext =
173 dma_map_single(sc->dev, skb->data,
174 skb->len, DMA_TO_DEVICE);
175 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
176 dev_kfree_skb_any(skb);
178 ath_print(common, ATH_DBG_FATAL,
179 "dma_mapping_error on beaconing\n");
183 skb = ieee80211_get_buffered_bc(hw, vif);
186 * if the CABQ traffic from previous DTIM is pending and the current
187 * beacon is also a DTIM.
188 * 1) if there is only one vif let the cab traffic continue.
189 * 2) if there are more than one vif and we are using staggered
190 * beacons, then drain the cabq by dropping all the frames in
191 * the cabq so that the current vifs cab traffic can be scheduled.
193 spin_lock_bh(&cabq->axq_lock);
194 cabq_depth = cabq->axq_depth;
195 spin_unlock_bh(&cabq->axq_lock);
197 if (skb && cabq_depth) {
199 ath_print(common, ATH_DBG_BEACON,
200 "Flushing previous cabq traffic\n");
201 ath_draintxq(sc, cabq, false);
205 ath_beacon_setup(sc, avp, bf);
208 ath_tx_cabq(hw, skb);
209 skb = ieee80211_get_buffered_bc(hw, vif);
216 * Startup beacon transmission for adhoc mode when they are sent entirely
217 * by the hardware using the self-linked descriptor + veol trick.
219 static void ath_beacon_start_adhoc(struct ath_softc *sc,
220 struct ieee80211_vif *vif)
222 struct ath_hw *ah = sc->sc_ah;
223 struct ath_common *common = ath9k_hw_common(ah);
228 avp = (void *)vif->drv_priv;
230 if (avp->av_bcbuf == NULL)
236 ath_beacon_setup(sc, avp, bf);
238 /* NB: caller is known to have already stopped tx dma */
239 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
240 ath9k_hw_txstart(ah, sc->beacon.beaconq);
241 ath_print(common, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n",
242 sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc);
245 int ath_beaconq_setup(struct ath_hw *ah)
247 struct ath9k_tx_queue_info qi;
249 memset(&qi, 0, sizeof(qi));
253 /* NB: don't enable any interrupts */
254 return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi);
257 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
259 struct ath_softc *sc = aphy->sc;
260 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
266 avp = (void *)vif->drv_priv;
268 /* Allocate a beacon descriptor if we haven't done so. */
269 if (!avp->av_bcbuf) {
270 /* Allocate beacon state for hostap/ibss. We know
271 * a buffer is available. */
272 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
273 struct ath_buf, list);
274 list_del(&avp->av_bcbuf->list);
276 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
277 !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
280 * Assign the vif to a beacon xmit slot. As
281 * above, this cannot fail to find one.
284 for (slot = 0; slot < ATH_BCBUF; slot++)
285 if (sc->beacon.bslot[slot] == NULL) {
287 * XXX hack, space out slots to better
290 if (slot+1 < ATH_BCBUF &&
291 sc->beacon.bslot[slot+1] == NULL) {
292 avp->av_bslot = slot+1;
295 avp->av_bslot = slot;
296 /* NB: keep looking for a double slot */
298 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
299 sc->beacon.bslot[avp->av_bslot] = vif;
300 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
305 /* release the previous beacon frame, if it already exists. */
307 if (bf->bf_mpdu != NULL) {
309 dma_unmap_single(sc->dev, bf->bf_dmacontext,
310 skb->len, DMA_TO_DEVICE);
311 dev_kfree_skb_any(skb);
315 /* NB: the beacon data buffer must be 32-bit aligned. */
316 skb = ieee80211_beacon_get(sc->hw, vif);
318 ath_print(common, ATH_DBG_BEACON, "cannot get skb\n");
322 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
323 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
324 /* Calculate a TSF adjustment factor required for staggered beacons. */
325 if (avp->av_bslot > 0) {
329 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
332 * Calculate the TSF offset for this beacon slot, i.e., the
333 * number of usecs that need to be added to the timestamp field
334 * in Beacon and Probe Response frames. Beacon slot 0 is
335 * processed at the correct offset, so it does not require TSF
336 * adjustment. Other slots are adjusted to get the timestamp
337 * close to the TBTT for the BSS.
339 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
340 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
342 ath_print(common, ATH_DBG_BEACON,
343 "stagger beacons, bslot %d intval "
344 "%u tsfadjust %llu\n",
345 avp->av_bslot, intval, (unsigned long long)tsfadjust);
347 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
350 avp->tsf_adjust = cpu_to_le64(0);
353 bf->bf_buf_addr = bf->bf_dmacontext =
354 dma_map_single(sc->dev, skb->data,
355 skb->len, DMA_TO_DEVICE);
356 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
357 dev_kfree_skb_any(skb);
359 ath_print(common, ATH_DBG_FATAL,
360 "dma_mapping_error on beacon alloc\n");
367 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
369 if (avp->av_bcbuf != NULL) {
372 if (avp->av_bslot != -1) {
373 sc->beacon.bslot[avp->av_bslot] = NULL;
374 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
379 if (bf->bf_mpdu != NULL) {
380 struct sk_buff *skb = bf->bf_mpdu;
381 dma_unmap_single(sc->dev, bf->bf_dmacontext,
382 skb->len, DMA_TO_DEVICE);
383 dev_kfree_skb_any(skb);
386 list_add_tail(&bf->list, &sc->beacon.bbuf);
388 avp->av_bcbuf = NULL;
392 void ath_beacon_tasklet(unsigned long data)
394 struct ath_softc *sc = (struct ath_softc *)data;
395 struct ath_hw *ah = sc->sc_ah;
396 struct ath_common *common = ath9k_hw_common(ah);
397 struct ath_buf *bf = NULL;
398 struct ieee80211_vif *vif;
399 struct ath_wiphy *aphy;
401 u32 bfaddr, bc = 0, tsftu;
406 * Check if the previous beacon has gone out. If
407 * not don't try to post another, skip this period
408 * and wait for the next. Missed beacons indicate
409 * a problem and should not occur. If we miss too
410 * many consecutive beacons reset the device.
412 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
413 sc->beacon.bmisscnt++;
415 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
416 ath_print(common, ATH_DBG_BEACON,
417 "missed %u consecutive beacons\n",
418 sc->beacon.bmisscnt);
419 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
420 ath_print(common, ATH_DBG_BEACON,
421 "beacon is officially stuck\n");
422 sc->sc_flags |= SC_OP_TSF_RESET;
423 ath_reset(sc, false);
429 if (sc->beacon.bmisscnt != 0) {
430 ath_print(common, ATH_DBG_BEACON,
431 "resume beacon xmit after %u misses\n",
432 sc->beacon.bmisscnt);
433 sc->beacon.bmisscnt = 0;
437 * Generate beacon frames. we are sending frames
438 * staggered so calculate the slot for this frame based
439 * on the tsf to safeguard against missing an swba.
442 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
444 tsf = ath9k_hw_gettsf64(ah);
445 tsftu = TSF_TO_TU(tsf>>32, tsf);
446 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
448 * Reverse the slot order to get slot 0 on the TBTT offset that does
449 * not require TSF adjustment and other slots adding
450 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
451 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
452 * and slot 0 is at correct offset to TBTT.
454 slot = ATH_BCBUF - slot - 1;
455 vif = sc->beacon.bslot[slot];
456 aphy = sc->beacon.bslot_aphy[slot];
458 ath_print(common, ATH_DBG_BEACON,
459 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
460 slot, tsf, tsftu, intval, vif);
464 bf = ath_beacon_generate(aphy->hw, vif);
466 bfaddr = bf->bf_daddr;
472 * Handle slot time change when a non-ERP station joins/leaves
473 * an 11g network. The 802.11 layer notifies us via callback,
474 * we mark updateslot, then wait one beacon before effecting
475 * the change. This gives associated stations at least one
476 * beacon interval to note the state change.
478 * NB: The slot time change state machine is clocked according
479 * to whether we are bursting or staggering beacons. We
480 * recognize the request to update and record the current
481 * slot then don't transition until that slot is reached
482 * again. If we miss a beacon for that slot then we'll be
483 * slow to transition but we'll be sure at least one beacon
484 * interval has passed. When bursting slot is always left
485 * set to ATH_BCBUF so this check is a noop.
487 if (sc->beacon.updateslot == UPDATE) {
488 sc->beacon.updateslot = COMMIT; /* commit next beacon */
489 sc->beacon.slotupdate = slot;
490 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
491 ath9k_hw_setslottime(sc->sc_ah, sc->beacon.slottime);
492 sc->beacon.updateslot = OK;
496 * Stop any current dma and put the new frame(s) on the queue.
497 * This should never fail since we check above that no frames
498 * are still pending on the queue.
500 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
501 ath_print(common, ATH_DBG_FATAL,
502 "beacon queue %u did not stop?\n", sc->beacon.beaconq);
505 /* NB: cabq traffic should already be queued and primed */
506 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
507 ath9k_hw_txstart(ah, sc->beacon.beaconq);
509 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
513 static void ath9k_beacon_init(struct ath_softc *sc,
517 if (beacon_period & ATH9K_BEACON_RESET_TSF)
520 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
522 if (beacon_period & ATH9K_BEACON_RESET_TSF)
523 ath9k_ps_restore(sc);
527 * For multi-bss ap support beacons are either staggered evenly over N slots or
528 * burst together. For the former arrange for the SWBA to be delivered for each
529 * slot. Slots that are not occupied will generate nothing.
531 static void ath_beacon_config_ap(struct ath_softc *sc,
532 struct ath_beacon_config *conf)
534 u32 nexttbtt, intval;
536 /* Configure the timers only when the TSF has to be reset */
538 if (!(sc->sc_flags & SC_OP_TSF_RESET))
541 /* NB: the beacon interval is kept internally in TU's */
542 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
543 intval /= ATH_BCBUF; /* for staggered beacons */
545 intval |= ATH9K_BEACON_RESET_TSF;
548 * In AP mode we enable the beacon timers and SWBA interrupts to
549 * prepare beacon frames.
551 intval |= ATH9K_BEACON_ENA;
552 sc->imask |= ATH9K_INT_SWBA;
553 ath_beaconq_config(sc);
555 /* Set the computed AP beacon timers */
557 ath9k_hw_set_interrupts(sc->sc_ah, 0);
558 ath9k_beacon_init(sc, nexttbtt, intval);
559 sc->beacon.bmisscnt = 0;
560 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
562 /* Clear the reset TSF flag, so that subsequent beacon updation
563 will not reset the HW TSF. */
565 sc->sc_flags &= ~SC_OP_TSF_RESET;
569 * This sets up the beacon timers according to the timestamp of the last
570 * received beacon and the current TSF, configures PCF and DTIM
571 * handling, programs the sleep registers so the hardware will wakeup in
572 * time to receive beacons, and configures the beacon miss handling so
573 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
574 * we've associated with.
576 static void ath_beacon_config_sta(struct ath_softc *sc,
577 struct ath_beacon_config *conf)
579 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
580 struct ath9k_beacon_state bs;
581 int dtimperiod, dtimcount, sleepduration;
582 int cfpperiod, cfpcount;
583 u32 nexttbtt = 0, intval, tsftu;
585 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
587 memset(&bs, 0, sizeof(bs));
588 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
591 * Setup dtim and cfp parameters according to
592 * last beacon we received (which may be none).
594 dtimperiod = conf->dtim_period;
595 if (dtimperiod <= 0) /* NB: 0 if not known */
597 dtimcount = conf->dtim_count;
598 if (dtimcount >= dtimperiod) /* NB: sanity check */
600 cfpperiod = 1; /* NB: no PCF support yet */
603 sleepduration = conf->listen_interval * intval;
604 if (sleepduration <= 0)
605 sleepduration = intval;
608 * Pull nexttbtt forward to reflect the current
609 * TSF and calculate dtim+cfp state for the result.
611 tsf = ath9k_hw_gettsf64(sc->sc_ah);
612 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
614 num_beacons = tsftu / intval + 1;
615 offset = tsftu % intval;
616 nexttbtt = tsftu - offset;
620 /* DTIM Beacon every dtimperiod Beacon */
621 dtim_dec_count = num_beacons % dtimperiod;
622 /* CFP every cfpperiod DTIM Beacon */
623 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
627 dtimcount -= dtim_dec_count;
629 dtimcount += dtimperiod;
631 cfpcount -= cfp_dec_count;
633 cfpcount += cfpperiod;
635 bs.bs_intval = intval;
636 bs.bs_nexttbtt = nexttbtt;
637 bs.bs_dtimperiod = dtimperiod*intval;
638 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
639 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
640 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
641 bs.bs_cfpmaxduration = 0;
644 * Calculate the number of consecutive beacons to miss* before taking
645 * a BMISS interrupt. The configuration is specified in TU so we only
646 * need calculate based on the beacon interval. Note that we clamp the
647 * result to at most 15 beacons.
649 if (sleepduration > intval) {
650 bs.bs_bmissthreshold = conf->listen_interval *
651 ATH_DEFAULT_BMISS_LIMIT / 2;
653 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
654 if (bs.bs_bmissthreshold > 15)
655 bs.bs_bmissthreshold = 15;
656 else if (bs.bs_bmissthreshold <= 0)
657 bs.bs_bmissthreshold = 1;
661 * Calculate sleep duration. The configuration is given in ms.
662 * We ensure a multiple of the beacon period is used. Also, if the sleep
663 * duration is greater than the DTIM period then it makes senses
664 * to make it a multiple of that.
669 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
670 if (bs.bs_sleepduration > bs.bs_dtimperiod)
671 bs.bs_sleepduration = bs.bs_dtimperiod;
673 /* TSF out of range threshold fixed at 1 second */
674 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
676 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
677 ath_print(common, ATH_DBG_BEACON,
678 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
679 bs.bs_bmissthreshold, bs.bs_sleepduration,
680 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
682 /* Set the computed STA beacon timers */
684 ath9k_hw_set_interrupts(sc->sc_ah, 0);
685 ath9k_hw_set_sta_beacon_timers(sc->sc_ah, &bs);
686 sc->imask |= ATH9K_INT_BMISS;
687 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
690 static void ath_beacon_config_adhoc(struct ath_softc *sc,
691 struct ath_beacon_config *conf,
692 struct ieee80211_vif *vif)
694 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
696 u32 tsftu, intval, nexttbtt;
698 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
701 /* Pull nexttbtt forward to reflect the current TSF */
703 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
707 nexttbtt = roundup(nexttbtt, intval);
709 tsf = ath9k_hw_gettsf64(sc->sc_ah);
710 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
713 } while (nexttbtt < tsftu);
715 ath_print(common, ATH_DBG_BEACON,
716 "IBSS nexttbtt %u intval %u (%u)\n",
717 nexttbtt, intval, conf->beacon_interval);
720 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
721 * if we need to manually prepare beacon frames. Otherwise we use a
722 * self-linked tx descriptor and let the hardware deal with things.
724 intval |= ATH9K_BEACON_ENA;
725 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL))
726 sc->imask |= ATH9K_INT_SWBA;
728 ath_beaconq_config(sc);
730 /* Set the computed ADHOC beacon timers */
732 ath9k_hw_set_interrupts(sc->sc_ah, 0);
733 ath9k_beacon_init(sc, nexttbtt, intval);
734 sc->beacon.bmisscnt = 0;
735 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
737 /* FIXME: Handle properly when vif is NULL */
738 if (vif && sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)
739 ath_beacon_start_adhoc(sc, vif);
742 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
744 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
745 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
746 enum nl80211_iftype iftype;
748 /* Setup the beacon configuration parameters */
751 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
755 cur_conf->beacon_interval = bss_conf->beacon_int;
756 cur_conf->dtim_period = bss_conf->dtim_period;
757 cur_conf->listen_interval = 1;
758 cur_conf->dtim_count = 1;
759 cur_conf->bmiss_timeout =
760 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
762 iftype = sc->sc_ah->opmode;
766 * It looks like mac80211 may end up using beacon interval of zero in
767 * some cases (at least for mesh point). Avoid getting into an
768 * infinite loop by using a bit safer value instead. To be safe,
769 * do sanity check on beacon interval for all operating modes.
771 if (cur_conf->beacon_interval == 0)
772 cur_conf->beacon_interval = 100;
775 case NL80211_IFTYPE_AP:
776 ath_beacon_config_ap(sc, cur_conf);
778 case NL80211_IFTYPE_ADHOC:
779 case NL80211_IFTYPE_MESH_POINT:
780 ath_beacon_config_adhoc(sc, cur_conf, vif);
782 case NL80211_IFTYPE_STATION:
783 ath_beacon_config_sta(sc, cur_conf);
786 ath_print(common, ATH_DBG_CONFIG,
787 "Unsupported beaconing mode\n");
791 sc->sc_flags |= SC_OP_BEACONS;