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 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
52 qi.tqi_cwmax = qi_be.tqi_cwmax;
55 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
57 "Unable to update h/w beacon queue parameters\n");
60 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
66 * Associates the beacon frame buffer with a transmit descriptor. Will set
67 * up rate codes, and channel flags. Beacons are always sent out at the
68 * lowest rate, and are not retried.
70 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
71 struct ath_buf *bf, int rateidx)
73 struct sk_buff *skb = bf->bf_mpdu;
74 struct ath_hw *ah = sc->sc_ah;
75 struct ath_common *common = ath9k_hw_common(ah);
76 struct ath_tx_info info;
77 struct ieee80211_supported_band *sband;
78 u8 chainmask = ah->txchainmask;
81 ath9k_reset_beacon_status(sc);
83 sband = &sc->sbands[common->hw->conf.channel->band];
84 rate = sband->bitrates[rateidx].hw_value;
85 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
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;
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 void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
113 struct ath_softc *sc = hw->priv;
114 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
115 struct ath_tx_control txctl;
117 memset(&txctl, 0, sizeof(struct ath_tx_control));
118 txctl.txq = sc->beacon.cabq;
120 ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb);
122 if (ath_tx_start(hw, skb, &txctl) != 0) {
123 ath_dbg(common, XMIT, "CABQ TX failed\n");
124 dev_kfree_skb_any(skb);
128 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
129 struct ieee80211_vif *vif)
131 struct ath_softc *sc = hw->priv;
132 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
136 struct ath_txq *cabq;
137 struct ieee80211_tx_info *info;
140 ath9k_reset_beacon_status(sc);
142 avp = (void *)vif->drv_priv;
143 cabq = sc->beacon.cabq;
145 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
148 /* Release the old beacon first */
153 dma_unmap_single(sc->dev, bf->bf_buf_addr,
154 skb->len, DMA_TO_DEVICE);
155 dev_kfree_skb_any(skb);
159 /* Get a new beacon from mac80211 */
161 skb = ieee80211_beacon_get(hw, vif);
165 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
168 info = IEEE80211_SKB_CB(skb);
169 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
171 * TODO: make sure the seq# gets assigned properly (vs. other
174 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
175 sc->tx.seq_no += 0x10;
176 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
177 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
180 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
181 skb->len, DMA_TO_DEVICE);
182 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
183 dev_kfree_skb_any(skb);
186 ath_err(common, "dma_mapping_error on beaconing\n");
190 skb = ieee80211_get_buffered_bc(hw, vif);
193 * if the CABQ traffic from previous DTIM is pending and the current
194 * beacon is also a DTIM.
195 * 1) if there is only one vif let the cab traffic continue.
196 * 2) if there are more than one vif and we are using staggered
197 * beacons, then drain the cabq by dropping all the frames in
198 * the cabq so that the current vifs cab traffic can be scheduled.
200 spin_lock_bh(&cabq->axq_lock);
201 cabq_depth = cabq->axq_depth;
202 spin_unlock_bh(&cabq->axq_lock);
204 if (skb && cabq_depth) {
206 ath_dbg(common, BEACON,
207 "Flushing previous cabq traffic\n");
208 ath_draintxq(sc, cabq, false);
212 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
215 ath_tx_cabq(hw, skb);
216 skb = ieee80211_get_buffered_bc(hw, vif);
222 int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
224 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
228 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
231 avp = (void *)vif->drv_priv;
233 /* Allocate a beacon descriptor if we haven't done so. */
234 if (!avp->av_bcbuf) {
235 /* Allocate beacon state for hostap/ibss. We know
236 * a buffer is available. */
237 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
238 struct ath_buf, list);
239 list_del(&avp->av_bcbuf->list);
241 if (ath9k_uses_beacons(vif->type)) {
244 * Assign the vif to a beacon xmit slot. As
245 * above, this cannot fail to find one.
248 for (slot = 0; slot < ATH_BCBUF; slot++)
249 if (sc->beacon.bslot[slot] == NULL) {
250 avp->av_bslot = slot;
251 avp->is_bslot_active = false;
253 /* NB: keep looking for a double slot */
254 if (slot == 0 || !sc->beacon.bslot[slot-1])
257 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
258 sc->beacon.bslot[avp->av_bslot] = vif;
263 /* release the previous beacon frame, if it already exists. */
265 if (bf->bf_mpdu != NULL) {
267 dma_unmap_single(sc->dev, bf->bf_buf_addr,
268 skb->len, DMA_TO_DEVICE);
269 dev_kfree_skb_any(skb);
274 /* NB: the beacon data buffer must be 32-bit aligned. */
275 skb = ieee80211_beacon_get(sc->hw, vif);
279 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
280 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
281 /* Calculate a TSF adjustment factor required for staggered beacons. */
282 if (avp->av_bslot > 0) {
286 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
289 * Calculate the TSF offset for this beacon slot, i.e., the
290 * number of usecs that need to be added to the timestamp field
291 * in Beacon and Probe Response frames. Beacon slot 0 is
292 * processed at the correct offset, so it does not require TSF
293 * adjustment. Other slots are adjusted to get the timestamp
294 * close to the TBTT for the BSS.
296 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
297 avp->tsf_adjust = cpu_to_le64(tsfadjust);
299 ath_dbg(common, BEACON,
300 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
301 avp->av_bslot, intval, (unsigned long long)tsfadjust);
303 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
306 avp->tsf_adjust = cpu_to_le64(0);
309 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
310 skb->len, DMA_TO_DEVICE);
311 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
312 dev_kfree_skb_any(skb);
315 ath_err(common, "dma_mapping_error on beacon alloc\n");
318 avp->is_bslot_active = true;
323 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
325 if (avp->av_bcbuf != NULL) {
328 avp->is_bslot_active = false;
329 if (avp->av_bslot != -1) {
330 sc->beacon.bslot[avp->av_bslot] = NULL;
336 if (bf->bf_mpdu != NULL) {
337 struct sk_buff *skb = bf->bf_mpdu;
338 dma_unmap_single(sc->dev, bf->bf_buf_addr,
339 skb->len, DMA_TO_DEVICE);
340 dev_kfree_skb_any(skb);
344 list_add_tail(&bf->list, &sc->beacon.bbuf);
346 avp->av_bcbuf = NULL;
350 void ath_beacon_tasklet(unsigned long data)
352 struct ath_softc *sc = (struct ath_softc *)data;
353 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
354 struct ath_hw *ah = sc->sc_ah;
355 struct ath_common *common = ath9k_hw_common(ah);
356 struct ath_buf *bf = NULL;
357 struct ieee80211_vif *vif;
358 struct ath_tx_status ts;
363 * Check if the previous beacon has gone out. If
364 * not don't try to post another, skip this period
365 * and wait for the next. Missed beacons indicate
366 * a problem and should not occur. If we miss too
367 * many consecutive beacons reset the device.
369 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
370 sc->beacon.bmisscnt++;
372 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
373 ath_dbg(common, BSTUCK,
374 "missed %u consecutive beacons\n",
375 sc->beacon.bmisscnt);
376 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
377 if (sc->beacon.bmisscnt > 3)
378 ath9k_hw_bstuck_nfcal(ah);
379 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
380 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
381 sc->sc_flags |= SC_OP_TSF_RESET;
382 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
389 * Generate beacon frames. we are sending frames
390 * staggered so calculate the slot for this frame based
391 * on the tsf to safeguard against missing an swba.
395 if (ah->opmode == NL80211_IFTYPE_AP) {
400 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
401 tsf = ath9k_hw_gettsf64(ah);
402 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
403 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
404 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
405 vif = sc->beacon.bslot[slot];
407 ath_dbg(common, BEACON,
408 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
409 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
412 vif = sc->beacon.bslot[slot];
418 bf = ath_beacon_generate(sc->hw, vif);
420 bfaddr = bf->bf_daddr;
424 if (sc->beacon.bmisscnt != 0) {
425 ath_dbg(common, BSTUCK,
426 "resume beacon xmit after %u misses\n",
427 sc->beacon.bmisscnt);
428 sc->beacon.bmisscnt = 0;
433 * Handle slot time change when a non-ERP station joins/leaves
434 * an 11g network. The 802.11 layer notifies us via callback,
435 * we mark updateslot, then wait one beacon before effecting
436 * the change. This gives associated stations at least one
437 * beacon interval to note the state change.
439 * NB: The slot time change state machine is clocked according
440 * to whether we are bursting or staggering beacons. We
441 * recognize the request to update and record the current
442 * slot then don't transition until that slot is reached
443 * again. If we miss a beacon for that slot then we'll be
444 * slow to transition but we'll be sure at least one beacon
445 * interval has passed. When bursting slot is always left
446 * set to ATH_BCBUF so this check is a noop.
448 if (sc->beacon.updateslot == UPDATE) {
449 sc->beacon.updateslot = COMMIT; /* commit next beacon */
450 sc->beacon.slotupdate = slot;
451 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
452 ah->slottime = sc->beacon.slottime;
453 ath9k_hw_init_global_settings(ah);
454 sc->beacon.updateslot = OK;
457 /* NB: cabq traffic should already be queued and primed */
458 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
459 ath9k_hw_txstart(ah, sc->beacon.beaconq);
461 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
462 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
463 spin_lock_bh(&sc->sc_pcu_lock);
464 ath9k_hw_txprocdesc(ah, bf->bf_desc, (void *)&ts);
465 spin_unlock_bh(&sc->sc_pcu_lock);
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);
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 sc->sc_flags |= SC_OP_TSF_RESET;
514 ath9k_beacon_init(sc, nexttbtt, intval);
515 sc->beacon.bmisscnt = 0;
516 ath9k_hw_set_interrupts(ah);
517 ath9k_hw_enable_interrupts(ah);
521 * This sets up the beacon timers according to the timestamp of the last
522 * received beacon and the current TSF, configures PCF and DTIM
523 * handling, programs the sleep registers so the hardware will wakeup in
524 * time to receive beacons, and configures the beacon miss handling so
525 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
526 * we've associated with.
528 static void ath_beacon_config_sta(struct ath_softc *sc,
529 struct ath_beacon_config *conf)
531 struct ath_hw *ah = sc->sc_ah;
532 struct ath_common *common = ath9k_hw_common(ah);
533 struct ath9k_beacon_state bs;
534 int dtimperiod, dtimcount, sleepduration;
535 int cfpperiod, cfpcount;
536 u32 nexttbtt = 0, intval, tsftu;
538 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
540 /* No need to configure beacon if we are not associated */
541 if (!common->curaid) {
542 ath_dbg(common, BEACON,
543 "STA is not yet associated..skipping beacon config\n");
547 memset(&bs, 0, sizeof(bs));
548 intval = conf->beacon_interval;
551 * Setup dtim and cfp parameters according to
552 * last beacon we received (which may be none).
554 dtimperiod = conf->dtim_period;
555 dtimcount = conf->dtim_count;
556 if (dtimcount >= dtimperiod) /* NB: sanity check */
558 cfpperiod = 1; /* NB: no PCF support yet */
561 sleepduration = conf->listen_interval * intval;
564 * Pull nexttbtt forward to reflect the current
565 * TSF and calculate dtim+cfp state for the result.
567 tsf = ath9k_hw_gettsf64(ah);
568 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
570 num_beacons = tsftu / intval + 1;
571 offset = tsftu % intval;
572 nexttbtt = tsftu - offset;
576 /* DTIM Beacon every dtimperiod Beacon */
577 dtim_dec_count = num_beacons % dtimperiod;
578 /* CFP every cfpperiod DTIM Beacon */
579 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
583 dtimcount -= dtim_dec_count;
585 dtimcount += dtimperiod;
587 cfpcount -= cfp_dec_count;
589 cfpcount += cfpperiod;
591 bs.bs_intval = intval;
592 bs.bs_nexttbtt = nexttbtt;
593 bs.bs_dtimperiod = dtimperiod*intval;
594 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
595 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
596 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
597 bs.bs_cfpmaxduration = 0;
600 * Calculate the number of consecutive beacons to miss* before taking
601 * a BMISS interrupt. The configuration is specified in TU so we only
602 * need calculate based on the beacon interval. Note that we clamp the
603 * result to at most 15 beacons.
605 if (sleepduration > intval) {
606 bs.bs_bmissthreshold = conf->listen_interval *
607 ATH_DEFAULT_BMISS_LIMIT / 2;
609 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
610 if (bs.bs_bmissthreshold > 15)
611 bs.bs_bmissthreshold = 15;
612 else if (bs.bs_bmissthreshold <= 0)
613 bs.bs_bmissthreshold = 1;
617 * Calculate sleep duration. The configuration is given in ms.
618 * We ensure a multiple of the beacon period is used. Also, if the sleep
619 * duration is greater than the DTIM period then it makes senses
620 * to make it a multiple of that.
625 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
626 if (bs.bs_sleepduration > bs.bs_dtimperiod)
627 bs.bs_sleepduration = bs.bs_dtimperiod;
629 /* TSF out of range threshold fixed at 1 second */
630 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
632 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
633 ath_dbg(common, BEACON,
634 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
635 bs.bs_bmissthreshold, bs.bs_sleepduration,
636 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
638 /* Set the computed STA beacon timers */
640 ath9k_hw_disable_interrupts(ah);
641 ath9k_hw_set_sta_beacon_timers(ah, &bs);
642 ah->imask |= ATH9K_INT_BMISS;
644 ath9k_hw_set_interrupts(ah);
645 ath9k_hw_enable_interrupts(ah);
648 static void ath_beacon_config_adhoc(struct ath_softc *sc,
649 struct ath_beacon_config *conf)
651 struct ath_hw *ah = sc->sc_ah;
652 struct ath_common *common = ath9k_hw_common(ah);
653 u32 tsf, intval, nexttbtt;
655 ath9k_reset_beacon_status(sc);
657 intval = TU_TO_USEC(conf->beacon_interval);
658 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
659 nexttbtt = tsf + intval;
661 ath_dbg(common, BEACON, "IBSS nexttbtt %u intval %u (%u)\n",
662 nexttbtt, intval, conf->beacon_interval);
665 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
666 * if we need to manually prepare beacon frames. Otherwise we use a
667 * self-linked tx descriptor and let the hardware deal with things.
669 ah->imask |= ATH9K_INT_SWBA;
671 ath_beaconq_config(sc);
673 /* Set the computed ADHOC beacon timers */
675 ath9k_hw_disable_interrupts(ah);
676 ath9k_beacon_init(sc, nexttbtt, intval);
677 sc->beacon.bmisscnt = 0;
679 ath9k_hw_set_interrupts(ah);
680 ath9k_hw_enable_interrupts(ah);
683 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
684 struct ieee80211_vif *vif)
686 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
687 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
688 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
689 struct ath_vif *avp = (void *)vif->drv_priv;
692 * Can not have different beacon interval on multiple
695 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
696 (sc->nbcnvifs > 1) &&
697 (vif->type == NL80211_IFTYPE_AP) &&
698 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
699 ath_dbg(common, CONFIG,
700 "Changing beacon interval of multiple AP interfaces !\n");
704 * Can not configure station vif's beacon config
707 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
708 (vif->type != NL80211_IFTYPE_AP)) {
709 ath_dbg(common, CONFIG,
710 "STA vif's beacon not allowed on AP mode\n");
714 * Do not allow beacon config if HW was already configured
715 * with another STA vif
717 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
718 (vif->type == NL80211_IFTYPE_STATION) &&
719 (sc->sc_flags & SC_OP_BEACONS) &&
720 !avp->primary_sta_vif) {
721 ath_dbg(common, CONFIG,
722 "Beacon already configured for a station interface\n");
728 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
730 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
731 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
733 if (!ath9k_allow_beacon_config(sc, vif))
736 /* Setup the beacon configuration parameters */
737 cur_conf->beacon_interval = bss_conf->beacon_int;
738 cur_conf->dtim_period = bss_conf->dtim_period;
739 cur_conf->listen_interval = 1;
740 cur_conf->dtim_count = 1;
741 cur_conf->bmiss_timeout =
742 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
745 * It looks like mac80211 may end up using beacon interval of zero in
746 * some cases (at least for mesh point). Avoid getting into an
747 * infinite loop by using a bit safer value instead. To be safe,
748 * do sanity check on beacon interval for all operating modes.
750 if (cur_conf->beacon_interval == 0)
751 cur_conf->beacon_interval = 100;
754 * We don't parse dtim period from mac80211 during the driver
755 * initialization as it breaks association with hidden-ssid
756 * AP and it causes latency in roaming
758 if (cur_conf->dtim_period == 0)
759 cur_conf->dtim_period = 1;
764 static bool ath_has_valid_bslot(struct ath_softc *sc)
770 for (slot = 0; slot < ATH_BCBUF; slot++) {
771 if (sc->beacon.bslot[slot]) {
772 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
773 if (avp->is_bslot_active) {
783 void ath_set_beacon(struct ath_softc *sc)
785 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
786 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
788 switch (sc->sc_ah->opmode) {
789 case NL80211_IFTYPE_AP:
790 if (ath_has_valid_bslot(sc))
791 ath_beacon_config_ap(sc, cur_conf);
793 case NL80211_IFTYPE_ADHOC:
794 case NL80211_IFTYPE_MESH_POINT:
795 ath_beacon_config_adhoc(sc, cur_conf);
797 case NL80211_IFTYPE_STATION:
798 ath_beacon_config_sta(sc, cur_conf);
801 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
805 sc->sc_flags |= SC_OP_BEACONS;
808 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
810 struct ath_hw *ah = sc->sc_ah;
812 if (!ath_has_valid_bslot(sc))
817 /* Re-enable beaconing */
818 ah->imask |= ATH9K_INT_SWBA;
819 ath9k_hw_set_interrupts(ah);
821 /* Disable SWBA interrupt */
822 ah->imask &= ~ATH9K_INT_SWBA;
823 ath9k_hw_set_interrupts(ah);
824 tasklet_kill(&sc->bcon_tasklet);
825 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
827 ath9k_ps_restore(sc);