2 * Copyright (c) 2008-2011 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.
21 static void ath9k_reset_beacon_status(struct ath_softc *sc)
23 sc->beacon.tx_processed = false;
24 sc->beacon.tx_last = false;
28 * This function will modify certain transmit queue properties depending on
29 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
30 * settings and channel width min/max
32 int ath_beaconq_config(struct ath_softc *sc)
34 struct ath_hw *ah = sc->sc_ah;
35 struct ath_common *common = ath9k_hw_common(ah);
36 struct ath9k_tx_queue_info qi, qi_be;
39 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
40 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
41 /* Always burst out beacon and CAB traffic. */
46 /* Adhoc mode; important thing is to use 2x cwmin. */
47 txq = sc->tx.txq_map[WME_AC_BE];
48 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
49 qi.tqi_aifs = qi_be.tqi_aifs;
50 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
51 qi.tqi_cwmax = qi_be.tqi_cwmax;
54 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
56 "Unable to update h/w beacon queue parameters\n");
59 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
65 * Associates the beacon frame buffer with a transmit descriptor. Will set
66 * up rate codes, and channel flags. Beacons are always sent out at the
67 * lowest rate, and are not retried.
69 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
70 struct ath_buf *bf, int rateidx)
72 struct sk_buff *skb = bf->bf_mpdu;
73 struct ath_hw *ah = sc->sc_ah;
74 struct ath_common *common = ath9k_hw_common(ah);
76 struct ath9k_11n_rate_series series[4];
77 int flags, ctsrate = 0, ctsduration = 0;
78 struct ieee80211_supported_band *sband;
81 ath9k_reset_beacon_status(sc);
84 flags = ATH9K_TXDESC_NOACK;
88 sband = &sc->sbands[common->hw->conf.channel->band];
89 rate = sband->bitrates[rateidx].hw_value;
90 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
91 rate |= sband->bitrates[rateidx].hw_value_short;
93 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
94 ATH9K_PKT_TYPE_BEACON,
96 ATH9K_TXKEYIX_INVALID,
100 /* NB: beacon's BufLen must be a multiple of 4 bytes */
101 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
102 true, true, ds, bf->bf_buf_addr,
105 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
107 series[0].Rate = rate;
108 series[0].ChSel = ath_txchainmask_reduction(sc,
109 common->tx_chainmask, series[0].Rate);
110 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
111 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
115 static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
117 struct ath_softc *sc = hw->priv;
118 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
119 struct ath_tx_control txctl;
121 memset(&txctl, 0, sizeof(struct ath_tx_control));
122 txctl.txq = sc->beacon.cabq;
124 ath_dbg(common, ATH_DBG_XMIT,
125 "transmitting CABQ packet, skb: %p\n", skb);
127 if (ath_tx_start(hw, skb, &txctl) != 0) {
128 ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
129 dev_kfree_skb_any(skb);
133 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
134 struct ieee80211_vif *vif)
136 struct ath_softc *sc = hw->priv;
137 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
141 struct ath_txq *cabq;
142 struct ieee80211_tx_info *info;
145 ath9k_reset_beacon_status(sc);
147 avp = (void *)vif->drv_priv;
148 cabq = sc->beacon.cabq;
150 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
153 /* Release the old beacon first */
158 dma_unmap_single(sc->dev, bf->bf_buf_addr,
159 skb->len, DMA_TO_DEVICE);
160 dev_kfree_skb_any(skb);
164 /* Get a new beacon from mac80211 */
166 skb = ieee80211_beacon_get(hw, vif);
170 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
173 info = IEEE80211_SKB_CB(skb);
174 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
176 * TODO: make sure the seq# gets assigned properly (vs. other
179 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
180 sc->tx.seq_no += 0x10;
181 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
182 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
185 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
186 skb->len, DMA_TO_DEVICE);
187 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
188 dev_kfree_skb_any(skb);
191 ath_err(common, "dma_mapping_error on beaconing\n");
195 skb = ieee80211_get_buffered_bc(hw, vif);
198 * if the CABQ traffic from previous DTIM is pending and the current
199 * beacon is also a DTIM.
200 * 1) if there is only one vif let the cab traffic continue.
201 * 2) if there are more than one vif and we are using staggered
202 * beacons, then drain the cabq by dropping all the frames in
203 * the cabq so that the current vifs cab traffic can be scheduled.
205 spin_lock_bh(&cabq->axq_lock);
206 cabq_depth = cabq->axq_depth;
207 spin_unlock_bh(&cabq->axq_lock);
209 if (skb && cabq_depth) {
211 ath_dbg(common, ATH_DBG_BEACON,
212 "Flushing previous cabq traffic\n");
213 ath_draintxq(sc, cabq, false);
217 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
220 ath_tx_cabq(hw, skb);
221 skb = ieee80211_get_buffered_bc(hw, vif);
227 int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
229 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
233 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
236 avp = (void *)vif->drv_priv;
238 /* Allocate a beacon descriptor if we haven't done so. */
239 if (!avp->av_bcbuf) {
240 /* Allocate beacon state for hostap/ibss. We know
241 * a buffer is available. */
242 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
243 struct ath_buf, list);
244 list_del(&avp->av_bcbuf->list);
246 if (ath9k_uses_beacons(vif->type)) {
249 * Assign the vif to a beacon xmit slot. As
250 * above, this cannot fail to find one.
253 for (slot = 0; slot < ATH_BCBUF; slot++)
254 if (sc->beacon.bslot[slot] == NULL) {
255 avp->av_bslot = slot;
256 avp->is_bslot_active = false;
258 /* NB: keep looking for a double slot */
259 if (slot == 0 || !sc->beacon.bslot[slot-1])
262 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
263 sc->beacon.bslot[avp->av_bslot] = vif;
268 /* release the previous beacon frame, if it already exists. */
270 if (bf->bf_mpdu != NULL) {
272 dma_unmap_single(sc->dev, bf->bf_buf_addr,
273 skb->len, DMA_TO_DEVICE);
274 dev_kfree_skb_any(skb);
279 /* NB: the beacon data buffer must be 32-bit aligned. */
280 skb = ieee80211_beacon_get(sc->hw, vif);
284 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
285 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
286 /* Calculate a TSF adjustment factor required for staggered beacons. */
287 if (avp->av_bslot > 0) {
291 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
294 * Calculate the TSF offset for this beacon slot, i.e., the
295 * number of usecs that need to be added to the timestamp field
296 * in Beacon and Probe Response frames. Beacon slot 0 is
297 * processed at the correct offset, so it does not require TSF
298 * adjustment. Other slots are adjusted to get the timestamp
299 * close to the TBTT for the BSS.
301 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
302 avp->tsf_adjust = cpu_to_le64(tsfadjust);
304 ath_dbg(common, ATH_DBG_BEACON,
305 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
306 avp->av_bslot, intval, (unsigned long long)tsfadjust);
308 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
311 avp->tsf_adjust = cpu_to_le64(0);
314 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
315 skb->len, DMA_TO_DEVICE);
316 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
317 dev_kfree_skb_any(skb);
320 ath_err(common, "dma_mapping_error on beacon alloc\n");
323 avp->is_bslot_active = true;
328 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
330 if (avp->av_bcbuf != NULL) {
333 avp->is_bslot_active = false;
334 if (avp->av_bslot != -1) {
335 sc->beacon.bslot[avp->av_bslot] = NULL;
341 if (bf->bf_mpdu != NULL) {
342 struct sk_buff *skb = bf->bf_mpdu;
343 dma_unmap_single(sc->dev, bf->bf_buf_addr,
344 skb->len, DMA_TO_DEVICE);
345 dev_kfree_skb_any(skb);
349 list_add_tail(&bf->list, &sc->beacon.bbuf);
351 avp->av_bcbuf = NULL;
355 void ath_beacon_tasklet(unsigned long data)
357 struct ath_softc *sc = (struct ath_softc *)data;
358 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
359 struct ath_hw *ah = sc->sc_ah;
360 struct ath_common *common = ath9k_hw_common(ah);
361 struct ath_buf *bf = NULL;
362 struct ieee80211_vif *vif;
367 * Check if the previous beacon has gone out. If
368 * not don't try to post another, skip this period
369 * and wait for the next. Missed beacons indicate
370 * a problem and should not occur. If we miss too
371 * many consecutive beacons reset the device.
373 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
374 sc->beacon.bmisscnt++;
376 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
377 ath_dbg(common, ATH_DBG_BSTUCK,
378 "missed %u consecutive beacons\n",
379 sc->beacon.bmisscnt);
380 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
381 if (sc->beacon.bmisscnt > 3)
382 ath9k_hw_bstuck_nfcal(ah);
383 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
384 ath_dbg(common, ATH_DBG_BSTUCK,
385 "beacon is officially stuck\n");
386 sc->sc_flags |= SC_OP_TSF_RESET;
394 * Generate beacon frames. we are sending frames
395 * staggered so calculate the slot for this frame based
396 * on the tsf to safeguard against missing an swba.
400 if (ah->opmode == NL80211_IFTYPE_AP) {
405 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
406 tsf = ath9k_hw_gettsf64(ah);
407 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
408 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
409 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
410 vif = sc->beacon.bslot[slot];
412 ath_dbg(common, ATH_DBG_BEACON,
413 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
414 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
417 vif = sc->beacon.bslot[slot];
423 bf = ath_beacon_generate(sc->hw, vif);
425 bfaddr = bf->bf_daddr;
429 if (sc->beacon.bmisscnt != 0) {
430 ath_dbg(common, ATH_DBG_BSTUCK,
431 "resume beacon xmit after %u misses\n",
432 sc->beacon.bmisscnt);
433 sc->beacon.bmisscnt = 0;
438 * Handle slot time change when a non-ERP station joins/leaves
439 * an 11g network. The 802.11 layer notifies us via callback,
440 * we mark updateslot, then wait one beacon before effecting
441 * the change. This gives associated stations at least one
442 * beacon interval to note the state change.
444 * NB: The slot time change state machine is clocked according
445 * to whether we are bursting or staggering beacons. We
446 * recognize the request to update and record the current
447 * slot then don't transition until that slot is reached
448 * again. If we miss a beacon for that slot then we'll be
449 * slow to transition but we'll be sure at least one beacon
450 * interval has passed. When bursting slot is always left
451 * set to ATH_BCBUF so this check is a noop.
453 if (sc->beacon.updateslot == UPDATE) {
454 sc->beacon.updateslot = COMMIT; /* commit next beacon */
455 sc->beacon.slotupdate = slot;
456 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
457 ah->slottime = sc->beacon.slottime;
458 ath9k_hw_init_global_settings(ah);
459 sc->beacon.updateslot = OK;
462 /* NB: cabq traffic should already be queued and primed */
463 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
464 ath9k_hw_txstart(ah, sc->beacon.beaconq);
466 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
470 static void ath9k_beacon_init(struct ath_softc *sc,
474 if (sc->sc_flags & SC_OP_TSF_RESET) {
476 ath9k_hw_reset_tsf(sc->sc_ah);
479 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
481 if (sc->sc_flags & SC_OP_TSF_RESET) {
482 ath9k_ps_restore(sc);
483 sc->sc_flags &= ~SC_OP_TSF_RESET;
488 * For multi-bss ap support beacons are either staggered evenly over N slots or
489 * burst together. For the former arrange for the SWBA to be delivered for each
490 * slot. Slots that are not occupied will generate nothing.
492 static void ath_beacon_config_ap(struct ath_softc *sc,
493 struct ath_beacon_config *conf)
495 struct ath_hw *ah = sc->sc_ah;
496 u32 nexttbtt, intval;
498 /* NB: the beacon interval is kept internally in TU's */
499 intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
500 intval /= ATH_BCBUF; /* for staggered beacons */
504 * In AP mode we enable the beacon timers and SWBA interrupts to
505 * prepare beacon frames.
507 ah->imask |= ATH9K_INT_SWBA;
508 ath_beaconq_config(sc);
510 /* Set the computed AP beacon timers */
512 ath9k_hw_disable_interrupts(ah);
513 ath9k_beacon_init(sc, nexttbtt, intval);
514 sc->beacon.bmisscnt = 0;
515 ath9k_hw_set_interrupts(ah, ah->imask);
519 * This sets up the beacon timers according to the timestamp of the last
520 * received beacon and the current TSF, configures PCF and DTIM
521 * handling, programs the sleep registers so the hardware will wakeup in
522 * time to receive beacons, and configures the beacon miss handling so
523 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
524 * we've associated with.
526 static void ath_beacon_config_sta(struct ath_softc *sc,
527 struct ath_beacon_config *conf)
529 struct ath_hw *ah = sc->sc_ah;
530 struct ath_common *common = ath9k_hw_common(ah);
531 struct ath9k_beacon_state bs;
532 int dtimperiod, dtimcount, sleepduration;
533 int cfpperiod, cfpcount;
534 u32 nexttbtt = 0, intval, tsftu;
536 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
538 /* No need to configure beacon if we are not associated */
539 if (!common->curaid) {
540 ath_dbg(common, ATH_DBG_BEACON,
541 "STA is not yet associated..skipping beacon config\n");
545 memset(&bs, 0, sizeof(bs));
546 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
549 * Setup dtim and cfp parameters according to
550 * last beacon we received (which may be none).
552 dtimperiod = conf->dtim_period;
553 dtimcount = conf->dtim_count;
554 if (dtimcount >= dtimperiod) /* NB: sanity check */
556 cfpperiod = 1; /* NB: no PCF support yet */
559 sleepduration = conf->listen_interval * intval;
562 * Pull nexttbtt forward to reflect the current
563 * TSF and calculate dtim+cfp state for the result.
565 tsf = ath9k_hw_gettsf64(ah);
566 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
568 num_beacons = tsftu / intval + 1;
569 offset = tsftu % intval;
570 nexttbtt = tsftu - offset;
574 /* DTIM Beacon every dtimperiod Beacon */
575 dtim_dec_count = num_beacons % dtimperiod;
576 /* CFP every cfpperiod DTIM Beacon */
577 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
581 dtimcount -= dtim_dec_count;
583 dtimcount += dtimperiod;
585 cfpcount -= cfp_dec_count;
587 cfpcount += cfpperiod;
589 bs.bs_intval = intval;
590 bs.bs_nexttbtt = nexttbtt;
591 bs.bs_dtimperiod = dtimperiod*intval;
592 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
593 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
594 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
595 bs.bs_cfpmaxduration = 0;
598 * Calculate the number of consecutive beacons to miss* before taking
599 * a BMISS interrupt. The configuration is specified in TU so we only
600 * need calculate based on the beacon interval. Note that we clamp the
601 * result to at most 15 beacons.
603 if (sleepduration > intval) {
604 bs.bs_bmissthreshold = conf->listen_interval *
605 ATH_DEFAULT_BMISS_LIMIT / 2;
607 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
608 if (bs.bs_bmissthreshold > 15)
609 bs.bs_bmissthreshold = 15;
610 else if (bs.bs_bmissthreshold <= 0)
611 bs.bs_bmissthreshold = 1;
615 * Calculate sleep duration. The configuration is given in ms.
616 * We ensure a multiple of the beacon period is used. Also, if the sleep
617 * duration is greater than the DTIM period then it makes senses
618 * to make it a multiple of that.
623 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
624 if (bs.bs_sleepduration > bs.bs_dtimperiod)
625 bs.bs_sleepduration = bs.bs_dtimperiod;
627 /* TSF out of range threshold fixed at 1 second */
628 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
630 ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
631 ath_dbg(common, ATH_DBG_BEACON,
632 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
633 bs.bs_bmissthreshold, bs.bs_sleepduration,
634 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
636 /* Set the computed STA beacon timers */
638 ath9k_hw_disable_interrupts(ah);
639 ath9k_hw_set_sta_beacon_timers(ah, &bs);
640 ah->imask |= ATH9K_INT_BMISS;
643 * If the beacon config is called beacause of TSFOOR,
644 * Interrupts will be enabled back at the end of ath9k_tasklet
646 if (!(sc->ps_flags & PS_TSFOOR_SYNC))
647 ath9k_hw_set_interrupts(ah, ah->imask);
650 static void ath_beacon_config_adhoc(struct ath_softc *sc,
651 struct ath_beacon_config *conf)
653 struct ath_hw *ah = sc->sc_ah;
654 struct ath_common *common = ath9k_hw_common(ah);
655 u32 tsf, delta, intval, nexttbtt;
657 ath9k_reset_beacon_status(sc);
659 tsf = ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE);
660 intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
662 if (!sc->beacon.bc_tstamp)
663 nexttbtt = tsf + intval;
665 if (tsf > sc->beacon.bc_tstamp)
666 delta = (tsf - sc->beacon.bc_tstamp);
668 delta = (tsf + 1 + (~0U - sc->beacon.bc_tstamp));
669 nexttbtt = tsf + intval - (delta % intval);
672 ath_dbg(common, ATH_DBG_BEACON,
673 "IBSS nexttbtt %u intval %u (%u)\n",
674 nexttbtt, intval, conf->beacon_interval);
677 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
678 * if we need to manually prepare beacon frames. Otherwise we use a
679 * self-linked tx descriptor and let the hardware deal with things.
681 ah->imask |= ATH9K_INT_SWBA;
683 ath_beaconq_config(sc);
685 /* Set the computed ADHOC beacon timers */
687 ath9k_hw_disable_interrupts(ah);
688 ath9k_beacon_init(sc, nexttbtt, intval);
689 sc->beacon.bmisscnt = 0;
691 * If the beacon config is called beacause of TSFOOR,
692 * Interrupts will be enabled back at the end of ath9k_tasklet
694 if (!(sc->ps_flags & PS_TSFOOR_SYNC))
695 ath9k_hw_set_interrupts(ah, ah->imask);
698 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
699 struct ieee80211_vif *vif)
701 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
702 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
703 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
704 struct ath_vif *avp = (void *)vif->drv_priv;
707 * Can not have different beacon interval on multiple
710 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
711 (sc->nbcnvifs > 1) &&
712 (vif->type == NL80211_IFTYPE_AP) &&
713 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
714 ath_dbg(common, ATH_DBG_CONFIG,
715 "Changing beacon interval of multiple \
720 * Can not configure station vif's beacon config
723 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
724 (vif->type != NL80211_IFTYPE_AP)) {
725 ath_dbg(common, ATH_DBG_CONFIG,
726 "STA vif's beacon not allowed on AP mode\n");
730 * Do not allow beacon config if HW was already configured
731 * with another STA vif
733 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
734 (vif->type == NL80211_IFTYPE_STATION) &&
735 (sc->sc_flags & SC_OP_BEACONS) &&
736 !avp->primary_sta_vif) {
737 ath_dbg(common, ATH_DBG_CONFIG,
738 "Beacon already configured for a station interface\n");
744 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
746 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
747 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
749 if (!ath9k_allow_beacon_config(sc, vif))
752 /* Setup the beacon configuration parameters */
753 cur_conf->beacon_interval = bss_conf->beacon_int;
754 cur_conf->dtim_period = bss_conf->dtim_period;
755 cur_conf->listen_interval = 1;
756 cur_conf->dtim_count = 1;
757 cur_conf->bmiss_timeout =
758 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
761 * It looks like mac80211 may end up using beacon interval of zero in
762 * some cases (at least for mesh point). Avoid getting into an
763 * infinite loop by using a bit safer value instead. To be safe,
764 * do sanity check on beacon interval for all operating modes.
766 if (cur_conf->beacon_interval == 0)
767 cur_conf->beacon_interval = 100;
770 * We don't parse dtim period from mac80211 during the driver
771 * initialization as it breaks association with hidden-ssid
772 * AP and it causes latency in roaming
774 if (cur_conf->dtim_period == 0)
775 cur_conf->dtim_period = 1;
780 static bool ath_has_valid_bslot(struct ath_softc *sc)
786 for (slot = 0; slot < ATH_BCBUF; slot++) {
787 if (sc->beacon.bslot[slot]) {
788 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
789 if (avp->is_bslot_active) {
799 void ath_set_beacon(struct ath_softc *sc)
801 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
802 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
804 switch (sc->sc_ah->opmode) {
805 case NL80211_IFTYPE_AP:
806 if (ath_has_valid_bslot(sc))
807 ath_beacon_config_ap(sc, cur_conf);
809 case NL80211_IFTYPE_ADHOC:
810 case NL80211_IFTYPE_MESH_POINT:
811 ath_beacon_config_adhoc(sc, cur_conf);
813 case NL80211_IFTYPE_STATION:
814 ath_beacon_config_sta(sc, cur_conf);
817 ath_dbg(common, ATH_DBG_CONFIG,
818 "Unsupported beaconing mode\n");
822 sc->sc_flags |= SC_OP_BEACONS;
825 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
827 struct ath_hw *ah = sc->sc_ah;
829 if (!ath_has_valid_bslot(sc))
834 /* Re-enable beaconing */
835 ah->imask |= ATH9K_INT_SWBA;
836 ath9k_hw_set_interrupts(ah, ah->imask);
838 /* Disable SWBA interrupt */
839 ah->imask &= ~ATH9K_INT_SWBA;
840 ath9k_hw_set_interrupts(ah, ah->imask);
841 tasklet_kill(&sc->bcon_tasklet);
842 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
844 ath9k_ps_restore(sc);