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.
17 #include <linux/dma-mapping.h>
22 static void ath9k_reset_beacon_status(struct ath_softc *sc)
24 sc->beacon.tx_processed = false;
25 sc->beacon.tx_last = false;
29 * This function will modify certain transmit queue properties depending on
30 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
31 * settings and channel width min/max
33 static void ath9k_beaconq_config(struct ath_softc *sc)
35 struct ath_hw *ah = sc->sc_ah;
36 struct ath_common *common = ath9k_hw_common(ah);
37 struct ath9k_tx_queue_info qi, qi_be;
40 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
42 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
43 sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) {
44 /* Always burst out beacon and CAB traffic. */
49 /* Adhoc mode; important thing is to use 2x cwmin. */
50 txq = sc->tx.txq_map[IEEE80211_AC_BE];
51 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
52 qi.tqi_aifs = qi_be.tqi_aifs;
53 if (ah->slottime == ATH9K_SLOT_TIME_20)
54 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
56 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
57 qi.tqi_cwmax = qi_be.tqi_cwmax;
60 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
61 ath_err(common, "Unable to update h/w beacon queue parameters\n");
63 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
68 * Associates the beacon frame buffer with a transmit descriptor. Will set
69 * up rate codes, and channel flags. Beacons are always sent out at the
70 * lowest rate, and are not retried.
72 static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
73 struct ath_buf *bf, int rateidx)
75 struct sk_buff *skb = bf->bf_mpdu;
76 struct ath_hw *ah = sc->sc_ah;
77 struct ath_common *common = ath9k_hw_common(ah);
78 struct ath_tx_info info;
79 struct ieee80211_supported_band *sband;
80 u8 chainmask = ah->txchainmask;
83 sband = &sc->sbands[common->hw->conf.chandef.chan->band];
84 rate = sband->bitrates[rateidx].hw_value;
85 if (vif->bss_conf.use_short_preamble)
86 rate |= sband->bitrates[rateidx].hw_value_short;
88 memset(&info, 0, sizeof(info));
89 info.pkt_len = skb->len + FCS_LEN;
90 info.type = ATH9K_PKT_TYPE_BEACON;
91 info.txpower = MAX_RATE_POWER;
92 info.keyix = ATH9K_TXKEYIX_INVALID;
93 info.keytype = ATH9K_KEY_TYPE_CLEAR;
94 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
96 info.buf_addr[0] = bf->bf_buf_addr;
97 info.buf_len[0] = roundup(skb->len, 4);
102 info.qcu = sc->beacon.beaconq;
104 info.rates[0].Tries = 1;
105 info.rates[0].Rate = rate;
106 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
108 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
111 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
112 struct ieee80211_vif *vif)
114 struct ath_softc *sc = hw->priv;
115 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
117 struct ath_vif *avp = (void *)vif->drv_priv;
119 struct ath_txq *cabq = sc->beacon.cabq;
120 struct ieee80211_tx_info *info;
121 struct ieee80211_mgmt *mgmt_hdr;
124 if (avp->av_bcbuf == NULL)
130 dma_unmap_single(sc->dev, bf->bf_buf_addr,
131 skb->len, DMA_TO_DEVICE);
132 dev_kfree_skb_any(skb);
137 skb = ieee80211_beacon_get(hw, vif);
143 mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
144 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
146 info = IEEE80211_SKB_CB(skb);
147 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
149 * TODO: make sure the seq# gets assigned properly (vs. other
152 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
153 sc->tx.seq_no += 0x10;
154 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
155 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
158 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
159 skb->len, DMA_TO_DEVICE);
160 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
161 dev_kfree_skb_any(skb);
164 ath_err(common, "dma_mapping_error on beaconing\n");
168 skb = ieee80211_get_buffered_bc(hw, vif);
171 * if the CABQ traffic from previous DTIM is pending and the current
172 * beacon is also a DTIM.
173 * 1) if there is only one vif let the cab traffic continue.
174 * 2) if there are more than one vif and we are using staggered
175 * beacons, then drain the cabq by dropping all the frames in
176 * the cabq so that the current vifs cab traffic can be scheduled.
178 spin_lock_bh(&cabq->axq_lock);
179 cabq_depth = cabq->axq_depth;
180 spin_unlock_bh(&cabq->axq_lock);
182 if (skb && cabq_depth) {
184 ath_dbg(common, BEACON,
185 "Flushing previous cabq traffic\n");
186 ath_draintxq(sc, cabq);
190 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
193 ath_tx_cabq(hw, vif, skb);
198 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
200 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
201 struct ath_vif *avp = (void *)vif->drv_priv;
204 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
205 list_del(&avp->av_bcbuf->list);
207 for (slot = 0; slot < ATH_BCBUF; slot++) {
208 if (sc->beacon.bslot[slot] == NULL) {
209 avp->av_bslot = slot;
214 sc->beacon.bslot[avp->av_bslot] = vif;
217 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
221 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
223 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
224 struct ath_vif *avp = (void *)vif->drv_priv;
225 struct ath_buf *bf = avp->av_bcbuf;
227 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
230 tasklet_disable(&sc->bcon_tasklet);
232 if (bf && bf->bf_mpdu) {
233 struct sk_buff *skb = bf->bf_mpdu;
234 dma_unmap_single(sc->dev, bf->bf_buf_addr,
235 skb->len, DMA_TO_DEVICE);
236 dev_kfree_skb_any(skb);
241 avp->av_bcbuf = NULL;
242 sc->beacon.bslot[avp->av_bslot] = NULL;
244 list_add_tail(&bf->list, &sc->beacon.bbuf);
246 tasklet_enable(&sc->bcon_tasklet);
249 static int ath9k_beacon_choose_slot(struct ath_softc *sc)
251 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
252 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
258 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP &&
259 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) {
260 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
261 ath9k_hw_gettsf64(sc->sc_ah));
265 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
266 tsf = ath9k_hw_gettsf64(sc->sc_ah);
267 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
268 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
269 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
271 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
272 slot, tsf, tsftu / ATH_BCBUF);
277 void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
279 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
280 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
281 struct ath_vif *avp = (void *)vif->drv_priv;
284 if (avp->av_bslot == 0)
287 tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF;
288 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
290 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
291 (unsigned long long)tsfadjust, avp->av_bslot);
294 bool ath9k_csa_is_finished(struct ath_softc *sc)
296 struct ieee80211_vif *vif;
299 if (!vif || !vif->csa_active)
302 if (!ieee80211_csa_is_complete(vif))
305 ieee80211_csa_finish(vif);
311 void ath9k_beacon_tasklet(unsigned long data)
313 struct ath_softc *sc = (struct ath_softc *)data;
314 struct ath_hw *ah = sc->sc_ah;
315 struct ath_common *common = ath9k_hw_common(ah);
316 struct ath_buf *bf = NULL;
317 struct ieee80211_vif *vif;
318 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
321 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) {
322 ath_dbg(common, RESET,
323 "reset work is pending, skip beaconing now\n");
328 * Check if the previous beacon has gone out. If
329 * not don't try to post another, skip this period
330 * and wait for the next. Missed beacons indicate
331 * a problem and should not occur. If we miss too
332 * many consecutive beacons reset the device.
334 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
335 sc->beacon.bmisscnt++;
337 ath9k_hw_check_nav(ah);
339 if (!ath9k_hw_check_alive(ah))
340 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
342 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
343 ath_dbg(common, BSTUCK,
344 "missed %u consecutive beacons\n",
345 sc->beacon.bmisscnt);
346 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
347 if (sc->beacon.bmisscnt > 3)
348 ath9k_hw_bstuck_nfcal(ah);
349 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
350 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
351 sc->beacon.bmisscnt = 0;
352 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
358 /* EDMA devices check that in the tx completion function. */
359 if (!edma && ath9k_csa_is_finished(sc))
362 slot = ath9k_beacon_choose_slot(sc);
363 vif = sc->beacon.bslot[slot];
365 if (!vif || !vif->bss_conf.enable_beacon)
368 bf = ath9k_beacon_generate(sc->hw, vif);
370 if (sc->beacon.bmisscnt != 0) {
371 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
372 sc->beacon.bmisscnt);
373 sc->beacon.bmisscnt = 0;
377 * Handle slot time change when a non-ERP station joins/leaves
378 * an 11g network. The 802.11 layer notifies us via callback,
379 * we mark updateslot, then wait one beacon before effecting
380 * the change. This gives associated stations at least one
381 * beacon interval to note the state change.
383 * NB: The slot time change state machine is clocked according
384 * to whether we are bursting or staggering beacons. We
385 * recognize the request to update and record the current
386 * slot then don't transition until that slot is reached
387 * again. If we miss a beacon for that slot then we'll be
388 * slow to transition but we'll be sure at least one beacon
389 * interval has passed. When bursting slot is always left
390 * set to ATH_BCBUF so this check is a noop.
392 if (sc->beacon.updateslot == UPDATE) {
393 sc->beacon.updateslot = COMMIT;
394 sc->beacon.slotupdate = slot;
395 } else if (sc->beacon.updateslot == COMMIT &&
396 sc->beacon.slotupdate == slot) {
397 ah->slottime = sc->beacon.slottime;
398 ath9k_hw_init_global_settings(ah);
399 sc->beacon.updateslot = OK;
403 ath9k_reset_beacon_status(sc);
405 ath_dbg(common, BEACON,
406 "Transmitting beacon for slot: %d\n", slot);
408 /* NB: cabq traffic should already be queued and primed */
409 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
412 ath9k_hw_txstart(ah, sc->beacon.beaconq);
417 * Both nexttbtt and intval have to be in usecs.
419 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
420 u32 intval, bool reset_tsf)
422 struct ath_hw *ah = sc->sc_ah;
424 ath9k_hw_disable_interrupts(ah);
426 ath9k_hw_reset_tsf(ah);
427 ath9k_beaconq_config(sc);
428 ath9k_hw_beaconinit(ah, nexttbtt, intval);
429 sc->beacon.bmisscnt = 0;
430 ath9k_hw_set_interrupts(ah);
431 ath9k_hw_enable_interrupts(ah);
435 * For multi-bss ap support beacons are either staggered evenly over N slots or
436 * burst together. For the former arrange for the SWBA to be delivered for each
437 * slot. Slots that are not occupied will generate nothing.
439 static void ath9k_beacon_config_ap(struct ath_softc *sc,
440 struct ath_beacon_config *conf)
442 struct ath_hw *ah = sc->sc_ah;
443 struct ath_common *common = ath9k_hw_common(ah);
444 u32 nexttbtt, intval;
446 /* NB: the beacon interval is kept internally in TU's */
447 intval = TU_TO_USEC(conf->beacon_interval);
451 if (conf->enable_beacon)
452 ah->imask |= ATH9K_INT_SWBA;
454 ah->imask &= ~ATH9K_INT_SWBA;
456 ath_dbg(common, BEACON,
457 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
458 (conf->enable_beacon) ? "Enable" : "Disable",
459 nexttbtt, intval, conf->beacon_interval);
461 ath9k_beacon_init(sc, nexttbtt, intval, true);
465 * This sets up the beacon timers according to the timestamp of the last
466 * received beacon and the current TSF, configures PCF and DTIM
467 * handling, programs the sleep registers so the hardware will wakeup in
468 * time to receive beacons, and configures the beacon miss handling so
469 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
470 * we've associated with.
472 static void ath9k_beacon_config_sta(struct ath_softc *sc,
473 struct ath_beacon_config *conf)
475 struct ath_hw *ah = sc->sc_ah;
476 struct ath_common *common = ath9k_hw_common(ah);
477 struct ath9k_beacon_state bs;
478 int dtimperiod, dtimcount, sleepduration;
479 int cfpperiod, cfpcount;
480 u32 nexttbtt = 0, intval, tsftu;
482 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
484 /* No need to configure beacon if we are not associated */
485 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) {
486 ath_dbg(common, BEACON,
487 "STA is not yet associated..skipping beacon config\n");
491 memset(&bs, 0, sizeof(bs));
492 intval = conf->beacon_interval;
495 * Setup dtim and cfp parameters according to
496 * last beacon we received (which may be none).
498 dtimperiod = conf->dtim_period;
499 dtimcount = conf->dtim_count;
500 if (dtimcount >= dtimperiod) /* NB: sanity check */
502 cfpperiod = 1; /* NB: no PCF support yet */
505 sleepduration = conf->listen_interval * intval;
508 * Pull nexttbtt forward to reflect the current
509 * TSF and calculate dtim+cfp state for the result.
511 tsf = ath9k_hw_gettsf64(ah);
512 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
514 num_beacons = tsftu / intval + 1;
515 offset = tsftu % intval;
516 nexttbtt = tsftu - offset;
520 /* DTIM Beacon every dtimperiod Beacon */
521 dtim_dec_count = num_beacons % dtimperiod;
522 /* CFP every cfpperiod DTIM Beacon */
523 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
527 dtimcount -= dtim_dec_count;
529 dtimcount += dtimperiod;
531 cfpcount -= cfp_dec_count;
533 cfpcount += cfpperiod;
535 bs.bs_intval = intval;
536 bs.bs_nexttbtt = nexttbtt;
537 bs.bs_dtimperiod = dtimperiod*intval;
538 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
539 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
540 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
541 bs.bs_cfpmaxduration = 0;
544 * Calculate the number of consecutive beacons to miss* before taking
545 * a BMISS interrupt. The configuration is specified in TU so we only
546 * need calculate based on the beacon interval. Note that we clamp the
547 * result to at most 15 beacons.
549 if (sleepduration > intval) {
550 bs.bs_bmissthreshold = conf->listen_interval *
551 ATH_DEFAULT_BMISS_LIMIT / 2;
553 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
554 if (bs.bs_bmissthreshold > 15)
555 bs.bs_bmissthreshold = 15;
556 else if (bs.bs_bmissthreshold <= 0)
557 bs.bs_bmissthreshold = 1;
561 * Calculate sleep duration. The configuration is given in ms.
562 * We ensure a multiple of the beacon period is used. Also, if the sleep
563 * duration is greater than the DTIM period then it makes senses
564 * to make it a multiple of that.
569 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
570 if (bs.bs_sleepduration > bs.bs_dtimperiod)
571 bs.bs_sleepduration = bs.bs_dtimperiod;
573 /* TSF out of range threshold fixed at 1 second */
574 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
576 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
577 ath_dbg(common, BEACON,
578 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
579 bs.bs_bmissthreshold, bs.bs_sleepduration,
580 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
582 /* Set the computed STA beacon timers */
584 ath9k_hw_disable_interrupts(ah);
585 ath9k_hw_set_sta_beacon_timers(ah, &bs);
586 ah->imask |= ATH9K_INT_BMISS;
588 ath9k_hw_set_interrupts(ah);
589 ath9k_hw_enable_interrupts(ah);
592 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
593 struct ath_beacon_config *conf)
595 struct ath_hw *ah = sc->sc_ah;
596 struct ath_common *common = ath9k_hw_common(ah);
597 u32 intval, nexttbtt;
599 ath9k_reset_beacon_status(sc);
601 intval = TU_TO_USEC(conf->beacon_interval);
603 if (conf->ibss_creator) {
606 u32 tbtt, offset, tsftu;
610 * Pull nexttbtt forward to reflect the current
613 tsf = ath9k_hw_gettsf64(ah);
614 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
615 offset = tsftu % conf->beacon_interval;
616 tbtt = tsftu - offset;
618 tbtt += conf->beacon_interval;
620 nexttbtt = TU_TO_USEC(tbtt);
623 if (conf->enable_beacon)
624 ah->imask |= ATH9K_INT_SWBA;
626 ah->imask &= ~ATH9K_INT_SWBA;
628 ath_dbg(common, BEACON,
629 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
630 (conf->enable_beacon) ? "Enable" : "Disable",
631 nexttbtt, intval, conf->beacon_interval);
633 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator);
636 * Set the global 'beacon has been configured' flag for the
637 * joiner case in IBSS mode.
639 if (!conf->ibss_creator && conf->enable_beacon)
640 set_bit(SC_OP_BEACONS, &sc->sc_flags);
643 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
645 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
646 struct ath_vif *avp = (void *)vif->drv_priv;
648 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
649 if ((vif->type != NL80211_IFTYPE_AP) ||
650 (sc->nbcnvifs > 1)) {
651 ath_dbg(common, CONFIG,
652 "An AP interface is already present !\n");
657 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
658 if ((vif->type == NL80211_IFTYPE_STATION) &&
659 test_bit(SC_OP_BEACONS, &sc->sc_flags) &&
660 !avp->primary_sta_vif) {
661 ath_dbg(common, CONFIG,
662 "Beacon already configured for a station interface\n");
670 static void ath9k_cache_beacon_config(struct ath_softc *sc,
671 struct ieee80211_bss_conf *bss_conf)
673 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
674 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
676 ath_dbg(common, BEACON,
677 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
679 cur_conf->beacon_interval = bss_conf->beacon_int;
680 cur_conf->dtim_period = bss_conf->dtim_period;
681 cur_conf->listen_interval = 1;
682 cur_conf->dtim_count = 1;
683 cur_conf->ibss_creator = bss_conf->ibss_creator;
684 cur_conf->bmiss_timeout =
685 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
688 * It looks like mac80211 may end up using beacon interval of zero in
689 * some cases (at least for mesh point). Avoid getting into an
690 * infinite loop by using a bit safer value instead. To be safe,
691 * do sanity check on beacon interval for all operating modes.
693 if (cur_conf->beacon_interval == 0)
694 cur_conf->beacon_interval = 100;
697 * We don't parse dtim period from mac80211 during the driver
698 * initialization as it breaks association with hidden-ssid
699 * AP and it causes latency in roaming
701 if (cur_conf->dtim_period == 0)
702 cur_conf->dtim_period = 1;
706 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
709 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
710 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
712 bool skip_beacon = false;
714 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
715 ath9k_cache_beacon_config(sc, bss_conf);
716 ath9k_set_beacon(sc);
717 set_bit(SC_OP_BEACONS, &sc->sc_flags);
723 * Take care of multiple interfaces when
724 * enabling/disabling SWBA.
726 if (changed & BSS_CHANGED_BEACON_ENABLED) {
727 if (!bss_conf->enable_beacon &&
728 (sc->nbcnvifs <= 1)) {
729 cur_conf->enable_beacon = false;
730 } else if (bss_conf->enable_beacon) {
731 cur_conf->enable_beacon = true;
732 ath9k_cache_beacon_config(sc, bss_conf);
737 * Configure the HW beacon registers only when we have a valid
740 if (cur_conf->beacon_interval) {
742 * If we are joining an existing IBSS network, start beaconing
743 * only after a TSF-sync has taken place. Ensure that this
744 * happens by setting the appropriate flags.
746 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
747 bss_conf->enable_beacon) {
748 spin_lock_irqsave(&sc->sc_pm_lock, flags);
749 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
750 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
753 ath9k_set_beacon(sc);
757 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode
758 * here, it is done in ath9k_beacon_config_adhoc().
760 if (cur_conf->enable_beacon && !skip_beacon)
761 set_bit(SC_OP_BEACONS, &sc->sc_flags);
763 clear_bit(SC_OP_BEACONS, &sc->sc_flags);
767 void ath9k_set_beacon(struct ath_softc *sc)
769 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
770 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
772 switch (sc->sc_ah->opmode) {
773 case NL80211_IFTYPE_AP:
774 case NL80211_IFTYPE_MESH_POINT:
775 ath9k_beacon_config_ap(sc, cur_conf);
777 case NL80211_IFTYPE_ADHOC:
778 ath9k_beacon_config_adhoc(sc, cur_conf);
780 case NL80211_IFTYPE_STATION:
781 ath9k_beacon_config_sta(sc, cur_conf);
784 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");