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[sc->cur_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);
148 ath_assign_seq(common, skb);
151 ath9k_beacon_add_noa(sc, avp, skb);
153 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
154 skb->len, DMA_TO_DEVICE);
155 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
156 dev_kfree_skb_any(skb);
159 ath_err(common, "dma_mapping_error on beaconing\n");
163 skb = ieee80211_get_buffered_bc(hw, vif);
166 * if the CABQ traffic from previous DTIM is pending and the current
167 * beacon is also a DTIM.
168 * 1) if there is only one vif let the cab traffic continue.
169 * 2) if there are more than one vif and we are using staggered
170 * beacons, then drain the cabq by dropping all the frames in
171 * the cabq so that the current vifs cab traffic can be scheduled.
173 spin_lock_bh(&cabq->axq_lock);
174 cabq_depth = cabq->axq_depth;
175 spin_unlock_bh(&cabq->axq_lock);
177 if (skb && cabq_depth) {
178 if (sc->cur_chan->nvifs > 1) {
179 ath_dbg(common, BEACON,
180 "Flushing previous cabq traffic\n");
181 ath_draintxq(sc, cabq);
185 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
188 ath_tx_cabq(hw, vif, skb);
193 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
195 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
196 struct ath_vif *avp = (void *)vif->drv_priv;
199 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
200 list_del(&avp->av_bcbuf->list);
202 for (slot = 0; slot < ATH_BCBUF; slot++) {
203 if (sc->beacon.bslot[slot] == NULL) {
204 avp->av_bslot = slot;
209 sc->beacon.bslot[avp->av_bslot] = vif;
212 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
216 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
218 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
219 struct ath_vif *avp = (void *)vif->drv_priv;
220 struct ath_buf *bf = avp->av_bcbuf;
222 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
225 tasklet_disable(&sc->bcon_tasklet);
227 if (bf && bf->bf_mpdu) {
228 struct sk_buff *skb = bf->bf_mpdu;
229 dma_unmap_single(sc->dev, bf->bf_buf_addr,
230 skb->len, DMA_TO_DEVICE);
231 dev_kfree_skb_any(skb);
236 avp->av_bcbuf = NULL;
237 sc->beacon.bslot[avp->av_bslot] = NULL;
239 list_add_tail(&bf->list, &sc->beacon.bbuf);
241 tasklet_enable(&sc->bcon_tasklet);
244 static int ath9k_beacon_choose_slot(struct ath_softc *sc)
246 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
247 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
253 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP &&
254 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) {
255 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
256 ath9k_hw_gettsf64(sc->sc_ah));
260 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
261 tsf = ath9k_hw_gettsf64(sc->sc_ah);
262 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
263 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
264 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
266 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
267 slot, tsf, tsftu / ATH_BCBUF);
272 static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
274 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
275 struct ath_vif *avp = (void *)vif->drv_priv;
276 struct ath_beacon_config *cur_conf = &avp->chanctx->beacon;
279 if (avp->av_bslot == 0)
282 tsfadjust = cur_conf->beacon_interval * avp->av_bslot;
283 tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF;
284 avp->tsf_adjust = cpu_to_le64(tsfadjust);
286 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
287 (unsigned long long)tsfadjust, avp->av_bslot);
290 bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
292 if (!vif || !vif->csa_active)
295 if (!ieee80211_csa_is_complete(vif))
298 ieee80211_csa_finish(vif);
302 static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
304 struct ath_softc *sc = data;
305 ath9k_csa_is_finished(sc, vif);
308 void ath9k_csa_update(struct ath_softc *sc)
310 ieee80211_iterate_active_interfaces_atomic(sc->hw,
311 IEEE80211_IFACE_ITER_NORMAL,
312 ath9k_csa_update_vif, sc);
315 void ath9k_beacon_tasklet(unsigned long data)
317 struct ath_softc *sc = (struct ath_softc *)data;
318 struct ath_hw *ah = sc->sc_ah;
319 struct ath_common *common = ath9k_hw_common(ah);
320 struct ath_buf *bf = NULL;
321 struct ieee80211_vif *vif;
322 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
325 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) {
326 ath_dbg(common, RESET,
327 "reset work is pending, skip beaconing now\n");
332 * Check if the previous beacon has gone out. If
333 * not don't try to post another, skip this period
334 * and wait for the next. Missed beacons indicate
335 * a problem and should not occur. If we miss too
336 * many consecutive beacons reset the device.
338 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
339 sc->beacon.bmisscnt++;
341 ath9k_hw_check_nav(ah);
344 * If the previous beacon has not been transmitted
345 * and a MAC/BB hang has been identified, return
346 * here because a chip reset would have been
349 if (!ath_hw_check(sc))
352 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
353 ath_dbg(common, BSTUCK,
354 "missed %u consecutive beacons\n",
355 sc->beacon.bmisscnt);
356 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
357 if (sc->beacon.bmisscnt > 3)
358 ath9k_hw_bstuck_nfcal(ah);
359 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
360 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
361 sc->beacon.bmisscnt = 0;
362 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
368 slot = ath9k_beacon_choose_slot(sc);
369 vif = sc->beacon.bslot[slot];
371 /* EDMA devices check that in the tx completion function. */
373 if (ath9k_is_chanctx_enabled()) {
374 ath_chanctx_beacon_sent_ev(sc,
375 ATH_CHANCTX_EVENT_BEACON_SENT);
378 if (ath9k_csa_is_finished(sc, vif))
382 if (!vif || !vif->bss_conf.enable_beacon)
385 if (ath9k_is_chanctx_enabled()) {
386 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE);
389 bf = ath9k_beacon_generate(sc->hw, vif);
391 if (sc->beacon.bmisscnt != 0) {
392 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
393 sc->beacon.bmisscnt);
394 sc->beacon.bmisscnt = 0;
398 * Handle slot time change when a non-ERP station joins/leaves
399 * an 11g network. The 802.11 layer notifies us via callback,
400 * we mark updateslot, then wait one beacon before effecting
401 * the change. This gives associated stations at least one
402 * beacon interval to note the state change.
404 * NB: The slot time change state machine is clocked according
405 * to whether we are bursting or staggering beacons. We
406 * recognize the request to update and record the current
407 * slot then don't transition until that slot is reached
408 * again. If we miss a beacon for that slot then we'll be
409 * slow to transition but we'll be sure at least one beacon
410 * interval has passed. When bursting slot is always left
411 * set to ATH_BCBUF so this check is a noop.
413 if (sc->beacon.updateslot == UPDATE) {
414 sc->beacon.updateslot = COMMIT;
415 sc->beacon.slotupdate = slot;
416 } else if (sc->beacon.updateslot == COMMIT &&
417 sc->beacon.slotupdate == slot) {
418 ah->slottime = sc->beacon.slottime;
419 ath9k_hw_init_global_settings(ah);
420 sc->beacon.updateslot = OK;
424 ath9k_reset_beacon_status(sc);
426 ath_dbg(common, BEACON,
427 "Transmitting beacon for slot: %d\n", slot);
429 /* NB: cabq traffic should already be queued and primed */
430 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
433 ath9k_hw_txstart(ah, sc->beacon.beaconq);
438 * Both nexttbtt and intval have to be in usecs.
440 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
441 u32 intval, bool reset_tsf)
443 struct ath_hw *ah = sc->sc_ah;
445 ath9k_hw_disable_interrupts(ah);
447 ath9k_hw_reset_tsf(ah);
448 ath9k_beaconq_config(sc);
449 ath9k_hw_beaconinit(ah, nexttbtt, intval);
450 sc->beacon.bmisscnt = 0;
451 ath9k_hw_set_interrupts(ah);
452 ath9k_hw_enable_interrupts(ah);
456 * For multi-bss ap support beacons are either staggered evenly over N slots or
457 * burst together. For the former arrange for the SWBA to be delivered for each
458 * slot. Slots that are not occupied will generate nothing.
460 static void ath9k_beacon_config_ap(struct ath_softc *sc,
461 struct ath_beacon_config *conf)
463 struct ath_hw *ah = sc->sc_ah;
465 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
466 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false);
469 static void ath9k_beacon_config_sta(struct ath_hw *ah,
470 struct ath_beacon_config *conf)
472 struct ath9k_beacon_state bs;
474 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
477 ath9k_hw_disable_interrupts(ah);
478 ath9k_hw_set_sta_beacon_timers(ah, &bs);
479 ah->imask |= ATH9K_INT_BMISS;
481 ath9k_hw_set_interrupts(ah);
482 ath9k_hw_enable_interrupts(ah);
485 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
486 struct ath_beacon_config *conf)
488 struct ath_hw *ah = sc->sc_ah;
489 struct ath_common *common = ath9k_hw_common(ah);
491 ath9k_reset_beacon_status(sc);
493 ath9k_cmn_beacon_config_adhoc(ah, conf);
495 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator);
498 * Set the global 'beacon has been configured' flag for the
499 * joiner case in IBSS mode.
501 if (!conf->ibss_creator && conf->enable_beacon)
502 set_bit(ATH_OP_BEACONS, &common->op_flags);
505 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
506 struct ieee80211_vif *vif)
508 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
509 struct ath_vif *avp = (void *)vif->drv_priv;
511 if (ath9k_is_chanctx_enabled()) {
513 * If the VIF is not present in the current channel context,
514 * then we can't do the usual opmode checks. Allow the
515 * beacon config for the VIF to be updated in this case and
516 * return immediately.
518 if (sc->cur_chan != avp->chanctx)
522 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
523 if ((vif->type != NL80211_IFTYPE_AP) ||
524 (sc->nbcnvifs > 1)) {
525 ath_dbg(common, CONFIG,
526 "An AP interface is already present !\n");
531 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
532 if ((vif->type == NL80211_IFTYPE_STATION) &&
533 test_bit(ATH_OP_BEACONS, &common->op_flags) &&
534 vif != sc->cur_chan->primary_sta) {
535 ath_dbg(common, CONFIG,
536 "Beacon already configured for a station interface\n");
544 static void ath9k_cache_beacon_config(struct ath_softc *sc,
545 struct ath_chanctx *ctx,
546 struct ieee80211_bss_conf *bss_conf)
548 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
549 struct ath_beacon_config *cur_conf = &ctx->beacon;
551 ath_dbg(common, BEACON,
552 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
554 cur_conf->beacon_interval = bss_conf->beacon_int;
555 cur_conf->dtim_period = bss_conf->dtim_period;
556 cur_conf->dtim_count = 1;
557 cur_conf->ibss_creator = bss_conf->ibss_creator;
560 * It looks like mac80211 may end up using beacon interval of zero in
561 * some cases (at least for mesh point). Avoid getting into an
562 * infinite loop by using a bit safer value instead. To be safe,
563 * do sanity check on beacon interval for all operating modes.
565 if (cur_conf->beacon_interval == 0)
566 cur_conf->beacon_interval = 100;
568 cur_conf->bmiss_timeout =
569 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
572 * We don't parse dtim period from mac80211 during the driver
573 * initialization as it breaks association with hidden-ssid
574 * AP and it causes latency in roaming
576 if (cur_conf->dtim_period == 0)
577 cur_conf->dtim_period = 1;
581 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
584 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
585 struct ath_hw *ah = sc->sc_ah;
586 struct ath_common *common = ath9k_hw_common(ah);
587 struct ath_vif *avp = (void *)vif->drv_priv;
588 struct ath_chanctx *ctx = avp->chanctx;
589 struct ath_beacon_config *cur_conf;
591 bool skip_beacon = false;
596 cur_conf = &avp->chanctx->beacon;
597 if (vif->type == NL80211_IFTYPE_AP)
598 ath9k_set_tsfadjust(sc, vif);
600 if (!ath9k_allow_beacon_config(sc, vif))
603 if (vif->type == NL80211_IFTYPE_STATION) {
604 ath9k_cache_beacon_config(sc, ctx, bss_conf);
605 if (ctx != sc->cur_chan)
608 ath9k_set_beacon(sc);
609 set_bit(ATH_OP_BEACONS, &common->op_flags);
614 * Take care of multiple interfaces when
615 * enabling/disabling SWBA.
617 if (changed & BSS_CHANGED_BEACON_ENABLED) {
618 if (!bss_conf->enable_beacon &&
619 (sc->nbcnvifs <= 1)) {
620 cur_conf->enable_beacon = false;
621 } else if (bss_conf->enable_beacon) {
622 cur_conf->enable_beacon = true;
623 ath9k_cache_beacon_config(sc, ctx, bss_conf);
627 if (ctx != sc->cur_chan)
631 * Configure the HW beacon registers only when we have a valid
634 if (cur_conf->beacon_interval) {
636 * If we are joining an existing IBSS network, start beaconing
637 * only after a TSF-sync has taken place. Ensure that this
638 * happens by setting the appropriate flags.
640 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
641 bss_conf->enable_beacon) {
642 spin_lock_irqsave(&sc->sc_pm_lock, flags);
643 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
644 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
647 ath9k_set_beacon(sc);
651 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
652 * here, it is done in ath9k_beacon_config_adhoc().
654 if (cur_conf->enable_beacon && !skip_beacon)
655 set_bit(ATH_OP_BEACONS, &common->op_flags);
657 clear_bit(ATH_OP_BEACONS, &common->op_flags);
661 void ath9k_set_beacon(struct ath_softc *sc)
663 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
664 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
666 switch (sc->sc_ah->opmode) {
667 case NL80211_IFTYPE_AP:
668 case NL80211_IFTYPE_MESH_POINT:
669 ath9k_beacon_config_ap(sc, cur_conf);
671 case NL80211_IFTYPE_ADHOC:
672 ath9k_beacon_config_adhoc(sc, cur_conf);
674 case NL80211_IFTYPE_STATION:
675 ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
678 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");