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 int ath_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);
41 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
42 /* Always burst out beacon and CAB traffic. */
47 /* Adhoc mode; important thing is to use 2x cwmin. */
48 txq = sc->tx.txq_map[WME_AC_BE];
49 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
50 qi.tqi_aifs = qi_be.tqi_aifs;
51 if (ah->slottime == ATH9K_SLOT_TIME_20)
52 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
54 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
55 qi.tqi_cwmax = qi_be.tqi_cwmax;
58 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
60 "Unable to update h/w beacon queue parameters\n");
63 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
69 * Associates the beacon frame buffer with a transmit descriptor. Will set
70 * up rate codes, and channel flags. Beacons are always sent out at the
71 * lowest rate, and are not retried.
73 static void ath_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
74 struct ath_buf *bf, int rateidx)
76 struct sk_buff *skb = bf->bf_mpdu;
77 struct ath_hw *ah = sc->sc_ah;
78 struct ath_common *common = ath9k_hw_common(ah);
79 struct ath_tx_info info;
80 struct ieee80211_supported_band *sband;
81 u8 chainmask = ah->txchainmask;
84 ath9k_reset_beacon_status(sc);
86 sband = &sc->sbands[common->hw->conf.channel->band];
87 rate = sband->bitrates[rateidx].hw_value;
88 if (vif->bss_conf.use_short_preamble)
89 rate |= sband->bitrates[rateidx].hw_value_short;
91 memset(&info, 0, sizeof(info));
92 info.pkt_len = skb->len + FCS_LEN;
93 info.type = ATH9K_PKT_TYPE_BEACON;
94 info.txpower = MAX_RATE_POWER;
95 info.keyix = ATH9K_TXKEYIX_INVALID;
96 info.keytype = ATH9K_KEY_TYPE_CLEAR;
97 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
99 info.buf_addr[0] = bf->bf_buf_addr;
100 info.buf_len[0] = roundup(skb->len, 4);
102 info.is_first = true;
105 info.qcu = sc->beacon.beaconq;
107 info.rates[0].Tries = 1;
108 info.rates[0].Rate = rate;
109 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
111 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
114 static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
116 struct ath_softc *sc = hw->priv;
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_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb);
125 if (ath_tx_start(hw, skb, &txctl) != 0) {
126 ath_dbg(common, XMIT, "CABQ TX failed\n");
127 dev_kfree_skb_any(skb);
131 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
132 struct ieee80211_vif *vif)
134 struct ath_softc *sc = hw->priv;
135 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
139 struct ath_txq *cabq;
140 struct ieee80211_tx_info *info;
143 ath9k_reset_beacon_status(sc);
145 avp = (void *)vif->drv_priv;
146 cabq = sc->beacon.cabq;
148 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
151 /* Release the old beacon first */
156 dma_unmap_single(sc->dev, bf->bf_buf_addr,
157 skb->len, DMA_TO_DEVICE);
158 dev_kfree_skb_any(skb);
162 /* Get a new beacon from mac80211 */
164 skb = ieee80211_beacon_get(hw, vif);
168 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
171 info = IEEE80211_SKB_CB(skb);
172 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
174 * TODO: make sure the seq# gets assigned properly (vs. other
177 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
178 sc->tx.seq_no += 0x10;
179 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
180 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
183 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
184 skb->len, DMA_TO_DEVICE);
185 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
186 dev_kfree_skb_any(skb);
189 ath_err(common, "dma_mapping_error on beaconing\n");
193 skb = ieee80211_get_buffered_bc(hw, vif);
196 * if the CABQ traffic from previous DTIM is pending and the current
197 * beacon is also a DTIM.
198 * 1) if there is only one vif let the cab traffic continue.
199 * 2) if there are more than one vif and we are using staggered
200 * beacons, then drain the cabq by dropping all the frames in
201 * the cabq so that the current vifs cab traffic can be scheduled.
203 spin_lock_bh(&cabq->axq_lock);
204 cabq_depth = cabq->axq_depth;
205 spin_unlock_bh(&cabq->axq_lock);
207 if (skb && cabq_depth) {
209 ath_dbg(common, BEACON,
210 "Flushing previous cabq traffic\n");
211 ath_draintxq(sc, cabq, false);
215 ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
218 ath_tx_cabq(hw, skb);
219 skb = ieee80211_get_buffered_bc(hw, vif);
225 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
227 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
228 struct ath_vif *avp = (void *)vif->drv_priv;
231 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
232 list_del(&avp->av_bcbuf->list);
234 for (slot = 0; slot < ATH_BCBUF; slot++) {
235 if (sc->beacon.bslot[slot] == NULL) {
236 avp->av_bslot = slot;
237 avp->is_bslot_active = false;
242 sc->beacon.bslot[avp->av_bslot] = vif;
245 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
249 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
251 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
252 struct ath_vif *avp = (void *)vif->drv_priv;
253 struct ath_buf *bf = avp->av_bcbuf;
255 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
258 tasklet_disable(&sc->bcon_tasklet);
260 if (bf && bf->bf_mpdu) {
261 struct sk_buff *skb = bf->bf_mpdu;
262 dma_unmap_single(sc->dev, bf->bf_buf_addr,
263 skb->len, DMA_TO_DEVICE);
264 dev_kfree_skb_any(skb);
269 avp->av_bcbuf = NULL;
270 avp->is_bslot_active = false;
271 sc->beacon.bslot[avp->av_bslot] = NULL;
273 list_add_tail(&bf->list, &sc->beacon.bbuf);
275 tasklet_enable(&sc->bcon_tasklet);
278 void ath_beacon_tasklet(unsigned long data)
280 struct ath_softc *sc = (struct ath_softc *)data;
281 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
282 struct ath_hw *ah = sc->sc_ah;
283 struct ath_common *common = ath9k_hw_common(ah);
284 struct ath_buf *bf = NULL;
285 struct ieee80211_vif *vif;
286 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
290 if (work_pending(&sc->hw_reset_work)) {
291 ath_dbg(common, RESET,
292 "reset work is pending, skip beaconing now\n");
296 * Check if the previous beacon has gone out. If
297 * not don't try to post another, skip this period
298 * and wait for the next. Missed beacons indicate
299 * a problem and should not occur. If we miss too
300 * many consecutive beacons reset the device.
302 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
303 sc->beacon.bmisscnt++;
305 if (!ath9k_hw_check_alive(ah))
306 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
308 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
309 ath_dbg(common, BSTUCK,
310 "missed %u consecutive beacons\n",
311 sc->beacon.bmisscnt);
312 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
313 if (sc->beacon.bmisscnt > 3)
314 ath9k_hw_bstuck_nfcal(ah);
315 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
316 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
317 sc->beacon.bmisscnt = 0;
318 set_bit(SC_OP_TSF_RESET, &sc->sc_flags);
319 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
326 * Generate beacon frames. we are sending frames
327 * staggered so calculate the slot for this frame based
328 * on the tsf to safeguard against missing an swba.
332 if (ah->opmode == NL80211_IFTYPE_AP) {
337 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
338 tsf = ath9k_hw_gettsf64(ah);
339 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
340 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
341 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
342 vif = sc->beacon.bslot[slot];
344 ath_dbg(common, BEACON,
345 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
346 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
349 vif = sc->beacon.bslot[slot];
355 bf = ath_beacon_generate(sc->hw, vif);
357 bfaddr = bf->bf_daddr;
361 if (sc->beacon.bmisscnt != 0) {
362 ath_dbg(common, BSTUCK,
363 "resume beacon xmit after %u misses\n",
364 sc->beacon.bmisscnt);
365 sc->beacon.bmisscnt = 0;
370 * Handle slot time change when a non-ERP station joins/leaves
371 * an 11g network. The 802.11 layer notifies us via callback,
372 * we mark updateslot, then wait one beacon before effecting
373 * the change. This gives associated stations at least one
374 * beacon interval to note the state change.
376 * NB: The slot time change state machine is clocked according
377 * to whether we are bursting or staggering beacons. We
378 * recognize the request to update and record the current
379 * slot then don't transition until that slot is reached
380 * again. If we miss a beacon for that slot then we'll be
381 * slow to transition but we'll be sure at least one beacon
382 * interval has passed. When bursting slot is always left
383 * set to ATH_BCBUF so this check is a noop.
385 if (sc->beacon.updateslot == UPDATE) {
386 sc->beacon.updateslot = COMMIT; /* commit next beacon */
387 sc->beacon.slotupdate = slot;
388 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
389 ah->slottime = sc->beacon.slottime;
390 ath9k_hw_init_global_settings(ah);
391 sc->beacon.updateslot = OK;
394 /* NB: cabq traffic should already be queued and primed */
395 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
398 ath9k_hw_txstart(ah, sc->beacon.beaconq);
400 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
404 static void ath9k_beacon_init(struct ath_softc *sc,
408 if (test_bit(SC_OP_TSF_RESET, &sc->sc_flags)) {
410 ath9k_hw_reset_tsf(sc->sc_ah);
413 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
415 if (test_bit(SC_OP_TSF_RESET, &sc->sc_flags)) {
416 ath9k_ps_restore(sc);
417 clear_bit(SC_OP_TSF_RESET, &sc->sc_flags);
422 * For multi-bss ap support beacons are either staggered evenly over N slots or
423 * burst together. For the former arrange for the SWBA to be delivered for each
424 * slot. Slots that are not occupied will generate nothing.
426 static void ath_beacon_config_ap(struct ath_softc *sc,
427 struct ath_beacon_config *conf)
429 struct ath_hw *ah = sc->sc_ah;
430 u32 nexttbtt, intval;
432 /* NB: the beacon interval is kept internally in TU's */
433 intval = TU_TO_USEC(conf->beacon_interval);
434 intval /= ATH_BCBUF; /* for staggered beacons */
438 * In AP mode we enable the beacon timers and SWBA interrupts to
439 * prepare beacon frames.
441 ah->imask |= ATH9K_INT_SWBA;
442 ath_beaconq_config(sc);
444 /* Set the computed AP beacon timers */
446 ath9k_hw_disable_interrupts(ah);
447 set_bit(SC_OP_TSF_RESET, &sc->sc_flags);
448 ath9k_beacon_init(sc, nexttbtt, intval);
449 sc->beacon.bmisscnt = 0;
450 ath9k_hw_set_interrupts(ah);
451 ath9k_hw_enable_interrupts(ah);
455 * This sets up the beacon timers according to the timestamp of the last
456 * received beacon and the current TSF, configures PCF and DTIM
457 * handling, programs the sleep registers so the hardware will wakeup in
458 * time to receive beacons, and configures the beacon miss handling so
459 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
460 * we've associated with.
462 static void ath_beacon_config_sta(struct ath_softc *sc,
463 struct ath_beacon_config *conf)
465 struct ath_hw *ah = sc->sc_ah;
466 struct ath_common *common = ath9k_hw_common(ah);
467 struct ath9k_beacon_state bs;
468 int dtimperiod, dtimcount, sleepduration;
469 int cfpperiod, cfpcount;
470 u32 nexttbtt = 0, intval, tsftu;
472 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
474 /* No need to configure beacon if we are not associated */
475 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) {
476 ath_dbg(common, BEACON,
477 "STA is not yet associated..skipping beacon config\n");
481 memset(&bs, 0, sizeof(bs));
482 intval = conf->beacon_interval;
485 * Setup dtim and cfp parameters according to
486 * last beacon we received (which may be none).
488 dtimperiod = conf->dtim_period;
489 dtimcount = conf->dtim_count;
490 if (dtimcount >= dtimperiod) /* NB: sanity check */
492 cfpperiod = 1; /* NB: no PCF support yet */
495 sleepduration = conf->listen_interval * intval;
498 * Pull nexttbtt forward to reflect the current
499 * TSF and calculate dtim+cfp state for the result.
501 tsf = ath9k_hw_gettsf64(ah);
502 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
504 num_beacons = tsftu / intval + 1;
505 offset = tsftu % intval;
506 nexttbtt = tsftu - offset;
510 /* DTIM Beacon every dtimperiod Beacon */
511 dtim_dec_count = num_beacons % dtimperiod;
512 /* CFP every cfpperiod DTIM Beacon */
513 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
517 dtimcount -= dtim_dec_count;
519 dtimcount += dtimperiod;
521 cfpcount -= cfp_dec_count;
523 cfpcount += cfpperiod;
525 bs.bs_intval = intval;
526 bs.bs_nexttbtt = nexttbtt;
527 bs.bs_dtimperiod = dtimperiod*intval;
528 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
529 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
530 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
531 bs.bs_cfpmaxduration = 0;
534 * Calculate the number of consecutive beacons to miss* before taking
535 * a BMISS interrupt. The configuration is specified in TU so we only
536 * need calculate based on the beacon interval. Note that we clamp the
537 * result to at most 15 beacons.
539 if (sleepduration > intval) {
540 bs.bs_bmissthreshold = conf->listen_interval *
541 ATH_DEFAULT_BMISS_LIMIT / 2;
543 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
544 if (bs.bs_bmissthreshold > 15)
545 bs.bs_bmissthreshold = 15;
546 else if (bs.bs_bmissthreshold <= 0)
547 bs.bs_bmissthreshold = 1;
551 * Calculate sleep duration. The configuration is given in ms.
552 * We ensure a multiple of the beacon period is used. Also, if the sleep
553 * duration is greater than the DTIM period then it makes senses
554 * to make it a multiple of that.
559 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
560 if (bs.bs_sleepduration > bs.bs_dtimperiod)
561 bs.bs_sleepduration = bs.bs_dtimperiod;
563 /* TSF out of range threshold fixed at 1 second */
564 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
566 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
567 ath_dbg(common, BEACON,
568 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
569 bs.bs_bmissthreshold, bs.bs_sleepduration,
570 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
572 /* Set the computed STA beacon timers */
574 ath9k_hw_disable_interrupts(ah);
575 ath9k_hw_set_sta_beacon_timers(ah, &bs);
576 ah->imask |= ATH9K_INT_BMISS;
578 ath9k_hw_set_interrupts(ah);
579 ath9k_hw_enable_interrupts(ah);
582 static void ath_beacon_config_adhoc(struct ath_softc *sc,
583 struct ath_beacon_config *conf)
585 struct ath_hw *ah = sc->sc_ah;
586 struct ath_common *common = ath9k_hw_common(ah);
587 u32 tsf, intval, nexttbtt;
589 ath9k_reset_beacon_status(sc);
590 if (!test_bit(SC_OP_BEACONS, &sc->sc_flags))
591 ath9k_hw_settsf64(ah, sc->beacon.bc_tstamp);
593 intval = TU_TO_USEC(conf->beacon_interval);
594 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
595 nexttbtt = tsf + intval;
597 ath_dbg(common, BEACON, "IBSS nexttbtt %u intval %u (%u)\n",
598 nexttbtt, intval, conf->beacon_interval);
601 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
602 * if we need to manually prepare beacon frames. Otherwise we use a
603 * self-linked tx descriptor and let the hardware deal with things.
605 ah->imask |= ATH9K_INT_SWBA;
607 ath_beaconq_config(sc);
609 /* Set the computed ADHOC beacon timers */
611 ath9k_hw_disable_interrupts(ah);
612 ath9k_beacon_init(sc, nexttbtt, intval);
613 sc->beacon.bmisscnt = 0;
615 ath9k_hw_set_interrupts(ah);
616 ath9k_hw_enable_interrupts(ah);
619 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
620 struct ieee80211_vif *vif)
622 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
623 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
624 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
625 struct ath_vif *avp = (void *)vif->drv_priv;
628 * Can not have different beacon interval on multiple
631 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
632 (sc->nbcnvifs > 1) &&
633 (vif->type == NL80211_IFTYPE_AP) &&
634 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
635 ath_dbg(common, CONFIG,
636 "Changing beacon interval of multiple AP interfaces !\n");
640 * Can not configure station vif's beacon config
643 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
644 (vif->type != NL80211_IFTYPE_AP)) {
645 ath_dbg(common, CONFIG,
646 "STA vif's beacon not allowed on AP mode\n");
650 * Do not allow beacon config if HW was already configured
651 * with another STA vif
653 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
654 (vif->type == NL80211_IFTYPE_STATION) &&
655 test_bit(SC_OP_BEACONS, &sc->sc_flags) &&
656 !avp->primary_sta_vif) {
657 ath_dbg(common, CONFIG,
658 "Beacon already configured for a station interface\n");
664 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
666 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
667 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
669 if (!ath9k_allow_beacon_config(sc, vif))
672 /* Setup the beacon configuration parameters */
673 cur_conf->beacon_interval = bss_conf->beacon_int;
674 cur_conf->dtim_period = bss_conf->dtim_period;
675 cur_conf->listen_interval = 1;
676 cur_conf->dtim_count = 1;
677 cur_conf->bmiss_timeout =
678 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
681 * It looks like mac80211 may end up using beacon interval of zero in
682 * some cases (at least for mesh point). Avoid getting into an
683 * infinite loop by using a bit safer value instead. To be safe,
684 * do sanity check on beacon interval for all operating modes.
686 if (cur_conf->beacon_interval == 0)
687 cur_conf->beacon_interval = 100;
690 * We don't parse dtim period from mac80211 during the driver
691 * initialization as it breaks association with hidden-ssid
692 * AP and it causes latency in roaming
694 if (cur_conf->dtim_period == 0)
695 cur_conf->dtim_period = 1;
700 static bool ath_has_valid_bslot(struct ath_softc *sc)
706 for (slot = 0; slot < ATH_BCBUF; slot++) {
707 if (sc->beacon.bslot[slot]) {
708 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
709 if (avp->is_bslot_active) {
719 void ath_set_beacon(struct ath_softc *sc)
721 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
722 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
724 switch (sc->sc_ah->opmode) {
725 case NL80211_IFTYPE_AP:
726 if (ath_has_valid_bslot(sc))
727 ath_beacon_config_ap(sc, cur_conf);
729 case NL80211_IFTYPE_ADHOC:
730 case NL80211_IFTYPE_MESH_POINT:
731 ath_beacon_config_adhoc(sc, cur_conf);
733 case NL80211_IFTYPE_STATION:
734 ath_beacon_config_sta(sc, cur_conf);
737 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
741 set_bit(SC_OP_BEACONS, &sc->sc_flags);
744 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
746 struct ath_hw *ah = sc->sc_ah;
748 if (!ath_has_valid_bslot(sc)) {
749 clear_bit(SC_OP_BEACONS, &sc->sc_flags);
755 /* Re-enable beaconing */
756 ah->imask |= ATH9K_INT_SWBA;
757 ath9k_hw_set_interrupts(ah);
759 /* Disable SWBA interrupt */
760 ah->imask &= ~ATH9K_INT_SWBA;
761 ath9k_hw_set_interrupts(ah);
762 tasklet_kill(&sc->bcon_tasklet);
763 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
765 ath9k_ps_restore(sc);