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 = &common->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 static 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;
288 tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF;
289 avp->tsf_adjust = cpu_to_le64(tsfadjust);
291 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
292 (unsigned long long)tsfadjust, avp->av_bslot);
295 bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
297 if (!vif || !vif->csa_active)
300 if (!ieee80211_csa_is_complete(vif))
303 ieee80211_csa_finish(vif);
307 static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
309 struct ath_softc *sc = data;
310 ath9k_csa_is_finished(sc, vif);
313 void ath9k_csa_update(struct ath_softc *sc)
315 ieee80211_iterate_active_interfaces(sc->hw,
316 IEEE80211_IFACE_ITER_NORMAL,
317 ath9k_csa_update_vif,
321 void ath9k_beacon_tasklet(unsigned long data)
323 struct ath_softc *sc = (struct ath_softc *)data;
324 struct ath_hw *ah = sc->sc_ah;
325 struct ath_common *common = ath9k_hw_common(ah);
326 struct ath_buf *bf = NULL;
327 struct ieee80211_vif *vif;
328 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
331 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) {
332 ath_dbg(common, RESET,
333 "reset work is pending, skip beaconing now\n");
338 * Check if the previous beacon has gone out. If
339 * not don't try to post another, skip this period
340 * and wait for the next. Missed beacons indicate
341 * a problem and should not occur. If we miss too
342 * many consecutive beacons reset the device.
344 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
345 sc->beacon.bmisscnt++;
347 ath9k_hw_check_nav(ah);
350 * If the previous beacon has not been transmitted
351 * and a MAC/BB hang has been identified, return
352 * here because a chip reset would have been
355 if (!ath_hw_check(sc))
358 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
359 ath_dbg(common, BSTUCK,
360 "missed %u consecutive beacons\n",
361 sc->beacon.bmisscnt);
362 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
363 if (sc->beacon.bmisscnt > 3)
364 ath9k_hw_bstuck_nfcal(ah);
365 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
366 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
367 sc->beacon.bmisscnt = 0;
368 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
374 slot = ath9k_beacon_choose_slot(sc);
375 vif = sc->beacon.bslot[slot];
377 /* EDMA devices check that in the tx completion function. */
378 if (!edma && ath9k_csa_is_finished(sc, vif))
381 if (!vif || !vif->bss_conf.enable_beacon)
384 bf = ath9k_beacon_generate(sc->hw, vif);
386 if (sc->beacon.bmisscnt != 0) {
387 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
388 sc->beacon.bmisscnt);
389 sc->beacon.bmisscnt = 0;
393 * Handle slot time change when a non-ERP station joins/leaves
394 * an 11g network. The 802.11 layer notifies us via callback,
395 * we mark updateslot, then wait one beacon before effecting
396 * the change. This gives associated stations at least one
397 * beacon interval to note the state change.
399 * NB: The slot time change state machine is clocked according
400 * to whether we are bursting or staggering beacons. We
401 * recognize the request to update and record the current
402 * slot then don't transition until that slot is reached
403 * again. If we miss a beacon for that slot then we'll be
404 * slow to transition but we'll be sure at least one beacon
405 * interval has passed. When bursting slot is always left
406 * set to ATH_BCBUF so this check is a noop.
408 if (sc->beacon.updateslot == UPDATE) {
409 sc->beacon.updateslot = COMMIT;
410 sc->beacon.slotupdate = slot;
411 } else if (sc->beacon.updateslot == COMMIT &&
412 sc->beacon.slotupdate == slot) {
413 ah->slottime = sc->beacon.slottime;
414 ath9k_hw_init_global_settings(ah);
415 sc->beacon.updateslot = OK;
419 ath9k_reset_beacon_status(sc);
421 ath_dbg(common, BEACON,
422 "Transmitting beacon for slot: %d\n", slot);
424 /* NB: cabq traffic should already be queued and primed */
425 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
428 ath9k_hw_txstart(ah, sc->beacon.beaconq);
433 * Both nexttbtt and intval have to be in usecs.
435 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
436 u32 intval, bool reset_tsf)
438 struct ath_hw *ah = sc->sc_ah;
440 ath9k_hw_disable_interrupts(ah);
442 ath9k_hw_reset_tsf(ah);
443 ath9k_beaconq_config(sc);
444 ath9k_hw_beaconinit(ah, nexttbtt, intval);
445 sc->beacon.bmisscnt = 0;
446 ath9k_hw_set_interrupts(ah);
447 ath9k_hw_enable_interrupts(ah);
450 /* Calculate the modulo of a 64 bit TSF snapshot with a TU divisor */
451 static u32 ath9k_mod_tsf64_tu(u64 tsf, u32 div_tu)
453 u32 tsf_mod, tsf_hi, tsf_lo, mod_hi, mod_lo;
455 tsf_mod = tsf & (BIT(10) - 1);
457 tsf_lo = ((u32) tsf) >> 10;
459 mod_hi = tsf_hi % div_tu;
460 mod_lo = ((mod_hi << 22) + tsf_lo) % div_tu;
462 return (mod_lo << 10) | tsf_mod;
465 static u32 ath9k_get_next_tbtt(struct ath_softc *sc, u64 tsf,
466 unsigned int interval)
468 struct ath_hw *ah = sc->sc_ah;
471 tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time);
472 offset = ath9k_mod_tsf64_tu(tsf, interval);
474 return (u32) tsf + TU_TO_USEC(interval) - offset;
478 * For multi-bss ap support beacons are either staggered evenly over N slots or
479 * burst together. For the former arrange for the SWBA to be delivered for each
480 * slot. Slots that are not occupied will generate nothing.
482 static void ath9k_beacon_config_ap(struct ath_softc *sc,
483 struct ath_beacon_config *conf)
485 struct ath_hw *ah = sc->sc_ah;
486 struct ath_common *common = ath9k_hw_common(ah);
487 u32 nexttbtt, intval;
489 /* NB: the beacon interval is kept internally in TU's */
490 intval = TU_TO_USEC(conf->beacon_interval);
492 nexttbtt = ath9k_get_next_tbtt(sc, ath9k_hw_gettsf64(ah),
493 conf->beacon_interval);
495 if (conf->enable_beacon)
496 ah->imask |= ATH9K_INT_SWBA;
498 ah->imask &= ~ATH9K_INT_SWBA;
500 ath_dbg(common, BEACON,
501 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
502 (conf->enable_beacon) ? "Enable" : "Disable",
503 nexttbtt, intval, conf->beacon_interval);
505 ath9k_beacon_init(sc, nexttbtt, intval, false);
509 * This sets up the beacon timers according to the timestamp of the last
510 * received beacon and the current TSF, configures PCF and DTIM
511 * handling, programs the sleep registers so the hardware will wakeup in
512 * time to receive beacons, and configures the beacon miss handling so
513 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
514 * we've associated with.
516 static void ath9k_beacon_config_sta(struct ath_softc *sc,
517 struct ath_beacon_config *conf)
519 struct ath_hw *ah = sc->sc_ah;
520 struct ath_common *common = ath9k_hw_common(ah);
521 struct ath9k_beacon_state bs;
523 u32 nexttbtt = 0, intval;
526 /* No need to configure beacon if we are not associated */
527 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) {
528 ath_dbg(common, BEACON,
529 "STA is not yet associated..skipping beacon config\n");
533 memset(&bs, 0, sizeof(bs));
534 intval = conf->beacon_interval;
537 * Setup dtim parameters according to
538 * last beacon we received (which may be none).
540 dtim_intval = intval * conf->dtim_period;
543 * Pull nexttbtt forward to reflect the current
544 * TSF and calculate dtim state for the result.
546 tsf = ath9k_hw_gettsf64(ah);
547 nexttbtt = ath9k_get_next_tbtt(sc, tsf, intval);
549 bs.bs_intval = TU_TO_USEC(intval);
550 bs.bs_dtimperiod = conf->dtim_period * bs.bs_intval;
551 bs.bs_nexttbtt = nexttbtt;
552 bs.bs_nextdtim = nexttbtt;
553 if (conf->dtim_period > 1)
554 bs.bs_nextdtim = ath9k_get_next_tbtt(sc, tsf, dtim_intval);
557 * Calculate the number of consecutive beacons to miss* before taking
558 * a BMISS interrupt. The configuration is specified in TU so we only
559 * need calculate based on the beacon interval. Note that we clamp the
560 * result to at most 15 beacons.
562 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
563 if (bs.bs_bmissthreshold > 15)
564 bs.bs_bmissthreshold = 15;
565 else if (bs.bs_bmissthreshold <= 0)
566 bs.bs_bmissthreshold = 1;
569 * Calculate sleep duration. The configuration is given in ms.
570 * We ensure a multiple of the beacon period is used. Also, if the sleep
571 * duration is greater than the DTIM period then it makes senses
572 * to make it a multiple of that.
577 bs.bs_sleepduration = TU_TO_USEC(roundup(IEEE80211_MS_TO_TU(100),
579 if (bs.bs_sleepduration > bs.bs_dtimperiod)
580 bs.bs_sleepduration = bs.bs_dtimperiod;
582 /* TSF out of range threshold fixed at 1 second */
583 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
585 ath_dbg(common, BEACON, "bmiss: %u sleep: %u\n",
586 bs.bs_bmissthreshold, bs.bs_sleepduration);
588 /* Set the computed STA beacon timers */
590 ath9k_hw_disable_interrupts(ah);
591 ath9k_hw_set_sta_beacon_timers(ah, &bs);
592 ah->imask |= ATH9K_INT_BMISS;
594 ath9k_hw_set_interrupts(ah);
595 ath9k_hw_enable_interrupts(ah);
598 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
599 struct ath_beacon_config *conf)
601 struct ath_hw *ah = sc->sc_ah;
602 struct ath_common *common = ath9k_hw_common(ah);
603 u32 intval, nexttbtt;
605 ath9k_reset_beacon_status(sc);
607 intval = TU_TO_USEC(conf->beacon_interval);
609 if (conf->ibss_creator)
612 nexttbtt = ath9k_get_next_tbtt(sc, ath9k_hw_gettsf64(ah),
613 conf->beacon_interval);
615 if (conf->enable_beacon)
616 ah->imask |= ATH9K_INT_SWBA;
618 ah->imask &= ~ATH9K_INT_SWBA;
620 ath_dbg(common, BEACON,
621 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
622 (conf->enable_beacon) ? "Enable" : "Disable",
623 nexttbtt, intval, conf->beacon_interval);
625 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator);
628 * Set the global 'beacon has been configured' flag for the
629 * joiner case in IBSS mode.
631 if (!conf->ibss_creator && conf->enable_beacon)
632 set_bit(SC_OP_BEACONS, &sc->sc_flags);
635 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
636 struct ieee80211_vif *vif)
638 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
639 struct ath_vif *avp = (void *)vif->drv_priv;
641 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
642 if ((vif->type != NL80211_IFTYPE_AP) ||
643 (sc->nbcnvifs > 1)) {
644 ath_dbg(common, CONFIG,
645 "An AP interface is already present !\n");
650 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
651 if ((vif->type == NL80211_IFTYPE_STATION) &&
652 test_bit(SC_OP_BEACONS, &sc->sc_flags) &&
653 !avp->primary_sta_vif) {
654 ath_dbg(common, CONFIG,
655 "Beacon already configured for a station interface\n");
663 static void ath9k_cache_beacon_config(struct ath_softc *sc,
664 struct ieee80211_bss_conf *bss_conf)
666 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
667 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
669 ath_dbg(common, BEACON,
670 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
672 cur_conf->beacon_interval = bss_conf->beacon_int;
673 cur_conf->dtim_period = bss_conf->dtim_period;
674 cur_conf->dtim_count = 1;
675 cur_conf->ibss_creator = bss_conf->ibss_creator;
676 cur_conf->bmiss_timeout =
677 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
680 * It looks like mac80211 may end up using beacon interval of zero in
681 * some cases (at least for mesh point). Avoid getting into an
682 * infinite loop by using a bit safer value instead. To be safe,
683 * do sanity check on beacon interval for all operating modes.
685 if (cur_conf->beacon_interval == 0)
686 cur_conf->beacon_interval = 100;
689 * We don't parse dtim period from mac80211 during the driver
690 * initialization as it breaks association with hidden-ssid
691 * AP and it causes latency in roaming
693 if (cur_conf->dtim_period == 0)
694 cur_conf->dtim_period = 1;
698 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
701 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
702 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
704 bool skip_beacon = false;
706 if (vif->type == NL80211_IFTYPE_AP)
707 ath9k_set_tsfadjust(sc, vif);
709 if (!ath9k_allow_beacon_config(sc, vif))
712 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
713 ath9k_cache_beacon_config(sc, bss_conf);
714 ath9k_set_beacon(sc);
715 set_bit(SC_OP_BEACONS, &sc->sc_flags);
720 * Take care of multiple interfaces when
721 * enabling/disabling SWBA.
723 if (changed & BSS_CHANGED_BEACON_ENABLED) {
724 if (!bss_conf->enable_beacon &&
725 (sc->nbcnvifs <= 1)) {
726 cur_conf->enable_beacon = false;
727 } else if (bss_conf->enable_beacon) {
728 cur_conf->enable_beacon = true;
729 ath9k_cache_beacon_config(sc, bss_conf);
734 * Configure the HW beacon registers only when we have a valid
737 if (cur_conf->beacon_interval) {
739 * If we are joining an existing IBSS network, start beaconing
740 * only after a TSF-sync has taken place. Ensure that this
741 * happens by setting the appropriate flags.
743 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
744 bss_conf->enable_beacon) {
745 spin_lock_irqsave(&sc->sc_pm_lock, flags);
746 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
747 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
750 ath9k_set_beacon(sc);
754 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode
755 * here, it is done in ath9k_beacon_config_adhoc().
757 if (cur_conf->enable_beacon && !skip_beacon)
758 set_bit(SC_OP_BEACONS, &sc->sc_flags);
760 clear_bit(SC_OP_BEACONS, &sc->sc_flags);
764 void ath9k_set_beacon(struct ath_softc *sc)
766 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
767 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
769 switch (sc->sc_ah->opmode) {
770 case NL80211_IFTYPE_AP:
771 case NL80211_IFTYPE_MESH_POINT:
772 ath9k_beacon_config_ap(sc, cur_conf);
774 case NL80211_IFTYPE_ADHOC:
775 ath9k_beacon_config_adhoc(sc, cur_conf);
777 case NL80211_IFTYPE_STATION:
778 ath9k_beacon_config_sta(sc, cur_conf);
781 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");