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, ATH_DBG_XMIT,
121 "transmitting CABQ packet, skb: %p\n", skb);
123 if (ath_tx_start(hw, skb, &txctl) != 0) {
124 ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
125 dev_kfree_skb_any(skb);
129 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
130 struct ieee80211_vif *vif)
132 struct ath_softc *sc = hw->priv;
133 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
137 struct ath_txq *cabq;
138 struct ieee80211_tx_info *info;
141 ath9k_reset_beacon_status(sc);
143 avp = (void *)vif->drv_priv;
144 cabq = sc->beacon.cabq;
146 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
149 /* Release the old beacon first */
154 dma_unmap_single(sc->dev, bf->bf_buf_addr,
155 skb->len, DMA_TO_DEVICE);
156 dev_kfree_skb_any(skb);
160 /* Get a new beacon from mac80211 */
162 skb = ieee80211_beacon_get(hw, vif);
166 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
169 info = IEEE80211_SKB_CB(skb);
170 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
172 * TODO: make sure the seq# gets assigned properly (vs. other
175 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
176 sc->tx.seq_no += 0x10;
177 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
178 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
181 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
182 skb->len, DMA_TO_DEVICE);
183 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
184 dev_kfree_skb_any(skb);
187 ath_err(common, "dma_mapping_error on beaconing\n");
191 skb = ieee80211_get_buffered_bc(hw, vif);
194 * if the CABQ traffic from previous DTIM is pending and the current
195 * beacon is also a DTIM.
196 * 1) if there is only one vif let the cab traffic continue.
197 * 2) if there are more than one vif and we are using staggered
198 * beacons, then drain the cabq by dropping all the frames in
199 * the cabq so that the current vifs cab traffic can be scheduled.
201 spin_lock_bh(&cabq->axq_lock);
202 cabq_depth = cabq->axq_depth;
203 spin_unlock_bh(&cabq->axq_lock);
205 if (skb && cabq_depth) {
207 ath_dbg(common, ATH_DBG_BEACON,
208 "Flushing previous cabq traffic\n");
209 ath_draintxq(sc, cabq, false);
213 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
216 ath_tx_cabq(hw, skb);
217 skb = ieee80211_get_buffered_bc(hw, vif);
223 int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
225 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
229 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
232 avp = (void *)vif->drv_priv;
234 /* Allocate a beacon descriptor if we haven't done so. */
235 if (!avp->av_bcbuf) {
236 /* Allocate beacon state for hostap/ibss. We know
237 * a buffer is available. */
238 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
239 struct ath_buf, list);
240 list_del(&avp->av_bcbuf->list);
242 if (ath9k_uses_beacons(vif->type)) {
245 * Assign the vif to a beacon xmit slot. As
246 * above, this cannot fail to find one.
249 for (slot = 0; slot < ATH_BCBUF; slot++)
250 if (sc->beacon.bslot[slot] == NULL) {
251 avp->av_bslot = slot;
252 avp->is_bslot_active = false;
254 /* NB: keep looking for a double slot */
255 if (slot == 0 || !sc->beacon.bslot[slot-1])
258 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
259 sc->beacon.bslot[avp->av_bslot] = vif;
264 /* release the previous beacon frame, if it already exists. */
266 if (bf->bf_mpdu != NULL) {
268 dma_unmap_single(sc->dev, bf->bf_buf_addr,
269 skb->len, DMA_TO_DEVICE);
270 dev_kfree_skb_any(skb);
275 /* NB: the beacon data buffer must be 32-bit aligned. */
276 skb = ieee80211_beacon_get(sc->hw, vif);
280 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
281 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
282 /* Calculate a TSF adjustment factor required for staggered beacons. */
283 if (avp->av_bslot > 0) {
287 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
290 * Calculate the TSF offset for this beacon slot, i.e., the
291 * number of usecs that need to be added to the timestamp field
292 * in Beacon and Probe Response frames. Beacon slot 0 is
293 * processed at the correct offset, so it does not require TSF
294 * adjustment. Other slots are adjusted to get the timestamp
295 * close to the TBTT for the BSS.
297 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
298 avp->tsf_adjust = cpu_to_le64(tsfadjust);
300 ath_dbg(common, ATH_DBG_BEACON,
301 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
302 avp->av_bslot, intval, (unsigned long long)tsfadjust);
304 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
307 avp->tsf_adjust = cpu_to_le64(0);
310 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
311 skb->len, DMA_TO_DEVICE);
312 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
313 dev_kfree_skb_any(skb);
316 ath_err(common, "dma_mapping_error on beacon alloc\n");
319 avp->is_bslot_active = true;
324 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
326 if (avp->av_bcbuf != NULL) {
329 avp->is_bslot_active = false;
330 if (avp->av_bslot != -1) {
331 sc->beacon.bslot[avp->av_bslot] = NULL;
337 if (bf->bf_mpdu != NULL) {
338 struct sk_buff *skb = bf->bf_mpdu;
339 dma_unmap_single(sc->dev, bf->bf_buf_addr,
340 skb->len, DMA_TO_DEVICE);
341 dev_kfree_skb_any(skb);
345 list_add_tail(&bf->list, &sc->beacon.bbuf);
347 avp->av_bcbuf = NULL;
351 void ath_beacon_tasklet(unsigned long data)
353 struct ath_softc *sc = (struct ath_softc *)data;
354 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
355 struct ath_hw *ah = sc->sc_ah;
356 struct ath_common *common = ath9k_hw_common(ah);
357 struct ath_buf *bf = NULL;
358 struct ieee80211_vif *vif;
359 struct ath_tx_status ts;
364 * Check if the previous beacon has gone out. If
365 * not don't try to post another, skip this period
366 * and wait for the next. Missed beacons indicate
367 * a problem and should not occur. If we miss too
368 * many consecutive beacons reset the device.
370 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
371 sc->beacon.bmisscnt++;
373 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
374 ath_dbg(common, ATH_DBG_BSTUCK,
375 "missed %u consecutive beacons\n",
376 sc->beacon.bmisscnt);
377 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
378 if (sc->beacon.bmisscnt > 3)
379 ath9k_hw_bstuck_nfcal(ah);
380 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
381 ath_dbg(common, ATH_DBG_BSTUCK,
382 "beacon is officially stuck\n");
383 sc->sc_flags |= SC_OP_TSF_RESET;
384 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
391 * Generate beacon frames. we are sending frames
392 * staggered so calculate the slot for this frame based
393 * on the tsf to safeguard against missing an swba.
397 if (ah->opmode == NL80211_IFTYPE_AP) {
402 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
403 tsf = ath9k_hw_gettsf64(ah);
404 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
405 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
406 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
407 vif = sc->beacon.bslot[slot];
409 ath_dbg(common, ATH_DBG_BEACON,
410 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
411 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
414 vif = sc->beacon.bslot[slot];
420 bf = ath_beacon_generate(sc->hw, vif);
422 bfaddr = bf->bf_daddr;
426 if (sc->beacon.bmisscnt != 0) {
427 ath_dbg(common, ATH_DBG_BSTUCK,
428 "resume beacon xmit after %u misses\n",
429 sc->beacon.bmisscnt);
430 sc->beacon.bmisscnt = 0;
435 * Handle slot time change when a non-ERP station joins/leaves
436 * an 11g network. The 802.11 layer notifies us via callback,
437 * we mark updateslot, then wait one beacon before effecting
438 * the change. This gives associated stations at least one
439 * beacon interval to note the state change.
441 * NB: The slot time change state machine is clocked according
442 * to whether we are bursting or staggering beacons. We
443 * recognize the request to update and record the current
444 * slot then don't transition until that slot is reached
445 * again. If we miss a beacon for that slot then we'll be
446 * slow to transition but we'll be sure at least one beacon
447 * interval has passed. When bursting slot is always left
448 * set to ATH_BCBUF so this check is a noop.
450 if (sc->beacon.updateslot == UPDATE) {
451 sc->beacon.updateslot = COMMIT; /* commit next beacon */
452 sc->beacon.slotupdate = slot;
453 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
454 ah->slottime = sc->beacon.slottime;
455 ath9k_hw_init_global_settings(ah);
456 sc->beacon.updateslot = OK;
459 /* NB: cabq traffic should already be queued and primed */
460 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
461 ath9k_hw_txstart(ah, sc->beacon.beaconq);
463 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
464 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
465 spin_lock_bh(&sc->sc_pcu_lock);
466 ath9k_hw_txprocdesc(ah, bf->bf_desc, (void *)&ts);
467 spin_unlock_bh(&sc->sc_pcu_lock);
472 static void ath9k_beacon_init(struct ath_softc *sc,
476 if (sc->sc_flags & SC_OP_TSF_RESET) {
478 ath9k_hw_reset_tsf(sc->sc_ah);
481 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
483 if (sc->sc_flags & SC_OP_TSF_RESET) {
484 ath9k_ps_restore(sc);
485 sc->sc_flags &= ~SC_OP_TSF_RESET;
490 * For multi-bss ap support beacons are either staggered evenly over N slots or
491 * burst together. For the former arrange for the SWBA to be delivered for each
492 * slot. Slots that are not occupied will generate nothing.
494 static void ath_beacon_config_ap(struct ath_softc *sc,
495 struct ath_beacon_config *conf)
497 struct ath_hw *ah = sc->sc_ah;
498 u32 nexttbtt, intval;
500 /* NB: the beacon interval is kept internally in TU's */
501 intval = TU_TO_USEC(conf->beacon_interval);
502 intval /= ATH_BCBUF; /* for staggered beacons */
506 * In AP mode we enable the beacon timers and SWBA interrupts to
507 * prepare beacon frames.
509 ah->imask |= ATH9K_INT_SWBA;
510 ath_beaconq_config(sc);
512 /* Set the computed AP beacon timers */
514 ath9k_hw_disable_interrupts(ah);
515 sc->sc_flags |= SC_OP_TSF_RESET;
516 ath9k_beacon_init(sc, nexttbtt, intval);
517 sc->beacon.bmisscnt = 0;
518 ath9k_hw_set_interrupts(ah, ah->imask);
519 ath9k_hw_enable_interrupts(ah);
523 * This sets up the beacon timers according to the timestamp of the last
524 * received beacon and the current TSF, configures PCF and DTIM
525 * handling, programs the sleep registers so the hardware will wakeup in
526 * time to receive beacons, and configures the beacon miss handling so
527 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
528 * we've associated with.
530 static void ath_beacon_config_sta(struct ath_softc *sc,
531 struct ath_beacon_config *conf)
533 struct ath_hw *ah = sc->sc_ah;
534 struct ath_common *common = ath9k_hw_common(ah);
535 struct ath9k_beacon_state bs;
536 int dtimperiod, dtimcount, sleepduration;
537 int cfpperiod, cfpcount;
538 u32 nexttbtt = 0, intval, tsftu;
540 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
542 /* No need to configure beacon if we are not associated */
543 if (!common->curaid) {
544 ath_dbg(common, ATH_DBG_BEACON,
545 "STA is not yet associated..skipping beacon config\n");
549 memset(&bs, 0, sizeof(bs));
550 intval = conf->beacon_interval;
553 * Setup dtim and cfp parameters according to
554 * last beacon we received (which may be none).
556 dtimperiod = conf->dtim_period;
557 dtimcount = conf->dtim_count;
558 if (dtimcount >= dtimperiod) /* NB: sanity check */
560 cfpperiod = 1; /* NB: no PCF support yet */
563 sleepduration = conf->listen_interval * intval;
566 * Pull nexttbtt forward to reflect the current
567 * TSF and calculate dtim+cfp state for the result.
569 tsf = ath9k_hw_gettsf64(ah);
570 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
572 num_beacons = tsftu / intval + 1;
573 offset = tsftu % intval;
574 nexttbtt = tsftu - offset;
578 /* DTIM Beacon every dtimperiod Beacon */
579 dtim_dec_count = num_beacons % dtimperiod;
580 /* CFP every cfpperiod DTIM Beacon */
581 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
585 dtimcount -= dtim_dec_count;
587 dtimcount += dtimperiod;
589 cfpcount -= cfp_dec_count;
591 cfpcount += cfpperiod;
593 bs.bs_intval = intval;
594 bs.bs_nexttbtt = nexttbtt;
595 bs.bs_dtimperiod = dtimperiod*intval;
596 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
597 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
598 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
599 bs.bs_cfpmaxduration = 0;
602 * Calculate the number of consecutive beacons to miss* before taking
603 * a BMISS interrupt. The configuration is specified in TU so we only
604 * need calculate based on the beacon interval. Note that we clamp the
605 * result to at most 15 beacons.
607 if (sleepduration > intval) {
608 bs.bs_bmissthreshold = conf->listen_interval *
609 ATH_DEFAULT_BMISS_LIMIT / 2;
611 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
612 if (bs.bs_bmissthreshold > 15)
613 bs.bs_bmissthreshold = 15;
614 else if (bs.bs_bmissthreshold <= 0)
615 bs.bs_bmissthreshold = 1;
619 * Calculate sleep duration. The configuration is given in ms.
620 * We ensure a multiple of the beacon period is used. Also, if the sleep
621 * duration is greater than the DTIM period then it makes senses
622 * to make it a multiple of that.
627 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
628 if (bs.bs_sleepduration > bs.bs_dtimperiod)
629 bs.bs_sleepduration = bs.bs_dtimperiod;
631 /* TSF out of range threshold fixed at 1 second */
632 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
634 ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
635 ath_dbg(common, ATH_DBG_BEACON,
636 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
637 bs.bs_bmissthreshold, bs.bs_sleepduration,
638 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
640 /* Set the computed STA beacon timers */
642 ath9k_hw_disable_interrupts(ah);
643 ath9k_hw_set_sta_beacon_timers(ah, &bs);
644 ah->imask |= ATH9K_INT_BMISS;
646 ath9k_hw_set_interrupts(ah, ah->imask);
647 ath9k_hw_enable_interrupts(ah);
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, intval, nexttbtt;
657 ath9k_reset_beacon_status(sc);
659 intval = TU_TO_USEC(conf->beacon_interval);
660 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
661 nexttbtt = tsf + intval;
663 ath_dbg(common, ATH_DBG_BEACON,
664 "IBSS nexttbtt %u intval %u (%u)\n",
665 nexttbtt, intval, conf->beacon_interval);
668 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
669 * if we need to manually prepare beacon frames. Otherwise we use a
670 * self-linked tx descriptor and let the hardware deal with things.
672 ah->imask |= ATH9K_INT_SWBA;
674 ath_beaconq_config(sc);
676 /* Set the computed ADHOC beacon timers */
678 ath9k_hw_disable_interrupts(ah);
679 ath9k_beacon_init(sc, nexttbtt, intval);
680 sc->beacon.bmisscnt = 0;
682 ath9k_hw_set_interrupts(ah, ah->imask);
683 ath9k_hw_enable_interrupts(ah);
686 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
687 struct ieee80211_vif *vif)
689 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
690 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
691 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
692 struct ath_vif *avp = (void *)vif->drv_priv;
695 * Can not have different beacon interval on multiple
698 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
699 (sc->nbcnvifs > 1) &&
700 (vif->type == NL80211_IFTYPE_AP) &&
701 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
702 ath_dbg(common, ATH_DBG_CONFIG,
703 "Changing beacon interval of multiple \
708 * Can not configure station vif's beacon config
711 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
712 (vif->type != NL80211_IFTYPE_AP)) {
713 ath_dbg(common, ATH_DBG_CONFIG,
714 "STA vif's beacon not allowed on AP mode\n");
718 * Do not allow beacon config if HW was already configured
719 * with another STA vif
721 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
722 (vif->type == NL80211_IFTYPE_STATION) &&
723 (sc->sc_flags & SC_OP_BEACONS) &&
724 !avp->primary_sta_vif) {
725 ath_dbg(common, ATH_DBG_CONFIG,
726 "Beacon already configured for a station interface\n");
732 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
734 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
735 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
737 if (!ath9k_allow_beacon_config(sc, vif))
740 /* Setup the beacon configuration parameters */
741 cur_conf->beacon_interval = bss_conf->beacon_int;
742 cur_conf->dtim_period = bss_conf->dtim_period;
743 cur_conf->listen_interval = 1;
744 cur_conf->dtim_count = 1;
745 cur_conf->bmiss_timeout =
746 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
749 * It looks like mac80211 may end up using beacon interval of zero in
750 * some cases (at least for mesh point). Avoid getting into an
751 * infinite loop by using a bit safer value instead. To be safe,
752 * do sanity check on beacon interval for all operating modes.
754 if (cur_conf->beacon_interval == 0)
755 cur_conf->beacon_interval = 100;
758 * We don't parse dtim period from mac80211 during the driver
759 * initialization as it breaks association with hidden-ssid
760 * AP and it causes latency in roaming
762 if (cur_conf->dtim_period == 0)
763 cur_conf->dtim_period = 1;
768 static bool ath_has_valid_bslot(struct ath_softc *sc)
774 for (slot = 0; slot < ATH_BCBUF; slot++) {
775 if (sc->beacon.bslot[slot]) {
776 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
777 if (avp->is_bslot_active) {
787 void ath_set_beacon(struct ath_softc *sc)
789 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
790 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
792 switch (sc->sc_ah->opmode) {
793 case NL80211_IFTYPE_AP:
794 if (ath_has_valid_bslot(sc))
795 ath_beacon_config_ap(sc, cur_conf);
797 case NL80211_IFTYPE_ADHOC:
798 case NL80211_IFTYPE_MESH_POINT:
799 ath_beacon_config_adhoc(sc, cur_conf);
801 case NL80211_IFTYPE_STATION:
802 ath_beacon_config_sta(sc, cur_conf);
805 ath_dbg(common, ATH_DBG_CONFIG,
806 "Unsupported beaconing mode\n");
810 sc->sc_flags |= SC_OP_BEACONS;
813 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
815 struct ath_hw *ah = sc->sc_ah;
817 if (!ath_has_valid_bslot(sc))
822 /* Re-enable beaconing */
823 ah->imask |= ATH9K_INT_SWBA;
824 ath9k_hw_set_interrupts(ah, ah->imask);
826 /* Disable SWBA interrupt */
827 ah->imask &= ~ATH9K_INT_SWBA;
828 ath9k_hw_set_interrupts(ah, ah->imask);
829 tasklet_kill(&sc->bcon_tasklet);
830 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
832 ath9k_ps_restore(sc);