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 for (i = 0; i < 4; i++)
92 info.txpower[i] = MAX_RATE_POWER;
93 info.keyix = ATH9K_TXKEYIX_INVALID;
94 info.keytype = ATH9K_KEY_TYPE_CLEAR;
95 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
97 info.buf_addr[0] = bf->bf_buf_addr;
98 info.buf_len[0] = roundup(skb->len, 4);
100 info.is_first = true;
103 info.qcu = sc->beacon.beaconq;
105 info.rates[0].Tries = 1;
106 info.rates[0].Rate = rate;
107 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
109 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
112 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
113 struct ieee80211_vif *vif)
115 struct ath_softc *sc = hw->priv;
116 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
118 struct ath_vif *avp = (void *)vif->drv_priv;
120 struct ath_txq *cabq = sc->beacon.cabq;
121 struct ieee80211_tx_info *info;
122 struct ieee80211_mgmt *mgmt_hdr;
125 if (avp->av_bcbuf == NULL)
131 dma_unmap_single(sc->dev, bf->bf_buf_addr,
132 skb->len, DMA_TO_DEVICE);
133 dev_kfree_skb_any(skb);
138 skb = ieee80211_beacon_get(hw, vif);
144 mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
145 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
147 info = IEEE80211_SKB_CB(skb);
149 ath_assign_seq(common, skb);
151 /* Always assign NOA attr when MCC enabled */
152 if (ath9k_is_chanctx_enabled())
153 ath9k_beacon_add_noa(sc, avp, skb);
155 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
156 skb->len, DMA_TO_DEVICE);
157 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
158 dev_kfree_skb_any(skb);
161 ath_err(common, "dma_mapping_error on beaconing\n");
165 skb = ieee80211_get_buffered_bc(hw, vif);
168 * if the CABQ traffic from previous DTIM is pending and the current
169 * beacon is also a DTIM.
170 * 1) if there is only one vif let the cab traffic continue.
171 * 2) if there are more than one vif and we are using staggered
172 * beacons, then drain the cabq by dropping all the frames in
173 * the cabq so that the current vifs cab traffic can be scheduled.
175 spin_lock_bh(&cabq->axq_lock);
176 cabq_depth = cabq->axq_depth;
177 spin_unlock_bh(&cabq->axq_lock);
179 if (skb && cabq_depth) {
180 if (sc->cur_chan->nvifs > 1) {
181 ath_dbg(common, BEACON,
182 "Flushing previous cabq traffic\n");
183 ath_draintxq(sc, cabq);
187 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
190 ath_tx_cabq(hw, vif, skb);
195 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
197 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
198 struct ath_vif *avp = (void *)vif->drv_priv;
201 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
202 list_del(&avp->av_bcbuf->list);
204 for (slot = 0; slot < ATH_BCBUF; slot++) {
205 if (sc->beacon.bslot[slot] == NULL) {
206 avp->av_bslot = slot;
211 sc->beacon.bslot[avp->av_bslot] = vif;
214 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
218 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
220 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
221 struct ath_vif *avp = (void *)vif->drv_priv;
222 struct ath_buf *bf = avp->av_bcbuf;
223 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
225 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
228 tasklet_disable(&sc->bcon_tasklet);
230 cur_conf->enable_beacon &= ~BIT(avp->av_bslot);
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_chan->beacon;
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_vif *avp = (void *)vif->drv_priv;
281 struct ath_beacon_config *cur_conf = &avp->chanctx->beacon;
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_atomic(sc->hw,
316 IEEE80211_IFACE_ITER_NORMAL,
317 ath9k_csa_update_vif, sc);
320 void ath9k_beacon_tasklet(unsigned long data)
322 struct ath_softc *sc = (struct ath_softc *)data;
323 struct ath_hw *ah = sc->sc_ah;
324 struct ath_common *common = ath9k_hw_common(ah);
325 struct ath_buf *bf = NULL;
326 struct ieee80211_vif *vif;
327 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
330 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) {
331 ath_dbg(common, RESET,
332 "reset work is pending, skip beaconing now\n");
337 * Check if the previous beacon has gone out. If
338 * not don't try to post another, skip this period
339 * and wait for the next. Missed beacons indicate
340 * a problem and should not occur. If we miss too
341 * many consecutive beacons reset the device.
343 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
344 sc->beacon.bmisscnt++;
346 ath9k_hw_check_nav(ah);
349 * If the previous beacon has not been transmitted
350 * and a MAC/BB hang has been identified, return
351 * here because a chip reset would have been
354 if (!ath_hw_check(sc))
357 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
358 ath_dbg(common, BSTUCK,
359 "missed %u consecutive beacons\n",
360 sc->beacon.bmisscnt);
361 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
362 if (sc->beacon.bmisscnt > 3)
363 ath9k_hw_bstuck_nfcal(ah);
364 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
365 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
366 sc->beacon.bmisscnt = 0;
367 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
373 slot = ath9k_beacon_choose_slot(sc);
374 vif = sc->beacon.bslot[slot];
376 /* EDMA devices check that in the tx completion function. */
378 if (ath9k_is_chanctx_enabled()) {
379 ath_chanctx_beacon_sent_ev(sc,
380 ATH_CHANCTX_EVENT_BEACON_SENT);
383 if (ath9k_csa_is_finished(sc, vif))
387 if (!vif || !vif->bss_conf.enable_beacon)
390 if (ath9k_is_chanctx_enabled()) {
391 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE);
394 bf = ath9k_beacon_generate(sc->hw, vif);
396 if (sc->beacon.bmisscnt != 0) {
397 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
398 sc->beacon.bmisscnt);
399 sc->beacon.bmisscnt = 0;
403 * Handle slot time change when a non-ERP station joins/leaves
404 * an 11g network. The 802.11 layer notifies us via callback,
405 * we mark updateslot, then wait one beacon before effecting
406 * the change. This gives associated stations at least one
407 * beacon interval to note the state change.
409 * NB: The slot time change state machine is clocked according
410 * to whether we are bursting or staggering beacons. We
411 * recognize the request to update and record the current
412 * slot then don't transition until that slot is reached
413 * again. If we miss a beacon for that slot then we'll be
414 * slow to transition but we'll be sure at least one beacon
415 * interval has passed. When bursting slot is always left
416 * set to ATH_BCBUF so this check is a noop.
418 if (sc->beacon.updateslot == UPDATE) {
419 sc->beacon.updateslot = COMMIT;
420 sc->beacon.slotupdate = slot;
421 } else if (sc->beacon.updateslot == COMMIT &&
422 sc->beacon.slotupdate == slot) {
423 ah->slottime = sc->beacon.slottime;
424 ath9k_hw_init_global_settings(ah);
425 sc->beacon.updateslot = OK;
429 ath9k_reset_beacon_status(sc);
431 ath_dbg(common, BEACON,
432 "Transmitting beacon for slot: %d\n", slot);
434 /* NB: cabq traffic should already be queued and primed */
435 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
438 ath9k_hw_txstart(ah, sc->beacon.beaconq);
443 * Both nexttbtt and intval have to be in usecs.
445 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
446 u32 intval, bool reset_tsf)
448 struct ath_hw *ah = sc->sc_ah;
450 ath9k_hw_disable_interrupts(ah);
452 ath9k_hw_reset_tsf(ah);
453 ath9k_beaconq_config(sc);
454 ath9k_hw_beaconinit(ah, nexttbtt, intval);
455 sc->beacon.bmisscnt = 0;
456 ath9k_hw_set_interrupts(ah);
457 ath9k_hw_enable_interrupts(ah);
461 * For multi-bss ap support beacons are either staggered evenly over N slots or
462 * burst together. For the former arrange for the SWBA to be delivered for each
463 * slot. Slots that are not occupied will generate nothing.
465 static void ath9k_beacon_config_ap(struct ath_softc *sc,
466 struct ath_beacon_config *conf)
468 struct ath_hw *ah = sc->sc_ah;
470 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
471 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false);
474 static void ath9k_beacon_config_sta(struct ath_hw *ah,
475 struct ath_beacon_config *conf)
477 struct ath9k_beacon_state bs;
479 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
482 ath9k_hw_disable_interrupts(ah);
483 ath9k_hw_set_sta_beacon_timers(ah, &bs);
484 ah->imask |= ATH9K_INT_BMISS;
486 ath9k_hw_set_interrupts(ah);
487 ath9k_hw_enable_interrupts(ah);
490 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
491 struct ath_beacon_config *conf)
493 struct ath_hw *ah = sc->sc_ah;
494 struct ath_common *common = ath9k_hw_common(ah);
496 ath9k_reset_beacon_status(sc);
498 ath9k_cmn_beacon_config_adhoc(ah, conf);
500 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator);
503 * Set the global 'beacon has been configured' flag for the
504 * joiner case in IBSS mode.
506 if (!conf->ibss_creator && conf->enable_beacon)
507 set_bit(ATH_OP_BEACONS, &common->op_flags);
510 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
511 struct ieee80211_vif *vif)
513 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
514 struct ath_vif *avp = (void *)vif->drv_priv;
516 if (ath9k_is_chanctx_enabled()) {
518 * If the VIF is not present in the current channel context,
519 * then we can't do the usual opmode checks. Allow the
520 * beacon config for the VIF to be updated in this case and
521 * return immediately.
523 if (sc->cur_chan != avp->chanctx)
527 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
528 if (vif->type != NL80211_IFTYPE_AP) {
529 ath_dbg(common, CONFIG,
530 "An AP interface is already present !\n");
535 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
536 if ((vif->type == NL80211_IFTYPE_STATION) &&
537 test_bit(ATH_OP_BEACONS, &common->op_flags) &&
538 vif != sc->cur_chan->primary_sta) {
539 ath_dbg(common, CONFIG,
540 "Beacon already configured for a station interface\n");
548 static void ath9k_cache_beacon_config(struct ath_softc *sc,
549 struct ath_chanctx *ctx,
550 struct ieee80211_bss_conf *bss_conf)
552 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
553 struct ath_beacon_config *cur_conf = &ctx->beacon;
555 ath_dbg(common, BEACON,
556 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
558 cur_conf->beacon_interval = bss_conf->beacon_int;
559 cur_conf->dtim_period = bss_conf->dtim_period;
560 cur_conf->dtim_count = 1;
561 cur_conf->ibss_creator = bss_conf->ibss_creator;
564 * It looks like mac80211 may end up using beacon interval of zero in
565 * some cases (at least for mesh point). Avoid getting into an
566 * infinite loop by using a bit safer value instead. To be safe,
567 * do sanity check on beacon interval for all operating modes.
569 if (cur_conf->beacon_interval == 0)
570 cur_conf->beacon_interval = 100;
572 cur_conf->bmiss_timeout =
573 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
576 * We don't parse dtim period from mac80211 during the driver
577 * initialization as it breaks association with hidden-ssid
578 * AP and it causes latency in roaming
580 if (cur_conf->dtim_period == 0)
581 cur_conf->dtim_period = 1;
585 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
588 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
589 struct ath_hw *ah = sc->sc_ah;
590 struct ath_common *common = ath9k_hw_common(ah);
591 struct ath_vif *avp = (void *)vif->drv_priv;
592 struct ath_chanctx *ctx = avp->chanctx;
593 struct ath_beacon_config *cur_conf;
595 bool skip_beacon = false;
600 cur_conf = &avp->chanctx->beacon;
601 if (vif->type == NL80211_IFTYPE_AP)
602 ath9k_set_tsfadjust(sc, vif);
604 if (!ath9k_allow_beacon_config(sc, vif))
607 if (vif->type == NL80211_IFTYPE_STATION) {
608 ath9k_cache_beacon_config(sc, ctx, bss_conf);
609 if (ctx != sc->cur_chan)
612 ath9k_set_beacon(sc);
613 set_bit(ATH_OP_BEACONS, &common->op_flags);
618 * Take care of multiple interfaces when
619 * enabling/disabling SWBA.
621 if (changed & BSS_CHANGED_BEACON_ENABLED) {
622 bool enabled = cur_conf->enable_beacon;
624 if (!bss_conf->enable_beacon) {
625 cur_conf->enable_beacon &= ~BIT(avp->av_bslot);
627 cur_conf->enable_beacon |= BIT(avp->av_bslot);
629 ath9k_cache_beacon_config(sc, ctx, bss_conf);
633 if (ctx != sc->cur_chan)
637 * Configure the HW beacon registers only when we have a valid
640 if (cur_conf->beacon_interval) {
642 * If we are joining an existing IBSS network, start beaconing
643 * only after a TSF-sync has taken place. Ensure that this
644 * happens by setting the appropriate flags.
646 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
647 bss_conf->enable_beacon) {
648 spin_lock_irqsave(&sc->sc_pm_lock, flags);
649 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
650 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
653 ath9k_set_beacon(sc);
657 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
658 * here, it is done in ath9k_beacon_config_adhoc().
660 if (cur_conf->enable_beacon && !skip_beacon)
661 set_bit(ATH_OP_BEACONS, &common->op_flags);
663 clear_bit(ATH_OP_BEACONS, &common->op_flags);
667 void ath9k_set_beacon(struct ath_softc *sc)
669 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
670 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
672 switch (sc->sc_ah->opmode) {
673 case NL80211_IFTYPE_AP:
674 case NL80211_IFTYPE_MESH_POINT:
675 ath9k_beacon_config_ap(sc, cur_conf);
677 case NL80211_IFTYPE_ADHOC:
678 ath9k_beacon_config_adhoc(sc, cur_conf);
680 case NL80211_IFTYPE_STATION:
681 ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
684 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");