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_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. */
377 if (!edma && ath9k_csa_is_finished(sc, vif))
380 if (!vif || !vif->bss_conf.enable_beacon)
383 bf = ath9k_beacon_generate(sc->hw, vif);
385 if (sc->beacon.bmisscnt != 0) {
386 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
387 sc->beacon.bmisscnt);
388 sc->beacon.bmisscnt = 0;
392 * Handle slot time change when a non-ERP station joins/leaves
393 * an 11g network. The 802.11 layer notifies us via callback,
394 * we mark updateslot, then wait one beacon before effecting
395 * the change. This gives associated stations at least one
396 * beacon interval to note the state change.
398 * NB: The slot time change state machine is clocked according
399 * to whether we are bursting or staggering beacons. We
400 * recognize the request to update and record the current
401 * slot then don't transition until that slot is reached
402 * again. If we miss a beacon for that slot then we'll be
403 * slow to transition but we'll be sure at least one beacon
404 * interval has passed. When bursting slot is always left
405 * set to ATH_BCBUF so this check is a noop.
407 if (sc->beacon.updateslot == UPDATE) {
408 sc->beacon.updateslot = COMMIT;
409 sc->beacon.slotupdate = slot;
410 } else if (sc->beacon.updateslot == COMMIT &&
411 sc->beacon.slotupdate == slot) {
412 ah->slottime = sc->beacon.slottime;
413 ath9k_hw_init_global_settings(ah);
414 sc->beacon.updateslot = OK;
418 ath9k_reset_beacon_status(sc);
420 ath_dbg(common, BEACON,
421 "Transmitting beacon for slot: %d\n", slot);
423 /* NB: cabq traffic should already be queued and primed */
424 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
427 ath9k_hw_txstart(ah, sc->beacon.beaconq);
432 * Both nexttbtt and intval have to be in usecs.
434 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
435 u32 intval, bool reset_tsf)
437 struct ath_hw *ah = sc->sc_ah;
439 ath9k_hw_disable_interrupts(ah);
441 ath9k_hw_reset_tsf(ah);
442 ath9k_beaconq_config(sc);
443 ath9k_hw_beaconinit(ah, nexttbtt, intval);
444 sc->beacon.bmisscnt = 0;
445 ath9k_hw_set_interrupts(ah);
446 ath9k_hw_enable_interrupts(ah);
450 * For multi-bss ap support beacons are either staggered evenly over N slots or
451 * burst together. For the former arrange for the SWBA to be delivered for each
452 * slot. Slots that are not occupied will generate nothing.
454 static void ath9k_beacon_config_ap(struct ath_softc *sc,
455 struct ath_beacon_config *conf)
457 struct ath_hw *ah = sc->sc_ah;
459 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
460 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false);
463 static void ath9k_beacon_config_sta(struct ath_hw *ah,
464 struct ath_beacon_config *conf)
466 struct ath9k_beacon_state bs;
468 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
471 ath9k_hw_disable_interrupts(ah);
472 ath9k_hw_set_sta_beacon_timers(ah, &bs);
473 ah->imask |= ATH9K_INT_BMISS;
475 ath9k_hw_set_interrupts(ah);
476 ath9k_hw_enable_interrupts(ah);
479 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
480 struct ath_beacon_config *conf)
482 struct ath_hw *ah = sc->sc_ah;
483 struct ath_common *common = ath9k_hw_common(ah);
485 ath9k_reset_beacon_status(sc);
487 ath9k_cmn_beacon_config_adhoc(ah, conf);
489 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator);
492 * Set the global 'beacon has been configured' flag for the
493 * joiner case in IBSS mode.
495 if (!conf->ibss_creator && conf->enable_beacon)
496 set_bit(ATH_OP_BEACONS, &common->op_flags);
499 static bool ath9k_allow_beacon_config(struct ath_softc *sc,
500 struct ieee80211_vif *vif)
502 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
503 struct ath_vif *avp = (void *)vif->drv_priv;
505 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
506 if ((vif->type != NL80211_IFTYPE_AP) ||
507 (sc->nbcnvifs > 1)) {
508 ath_dbg(common, CONFIG,
509 "An AP interface is already present !\n");
514 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
515 if ((vif->type == NL80211_IFTYPE_STATION) &&
516 test_bit(ATH_OP_BEACONS, &common->op_flags) &&
517 !avp->primary_sta_vif) {
518 ath_dbg(common, CONFIG,
519 "Beacon already configured for a station interface\n");
527 static void ath9k_cache_beacon_config(struct ath_softc *sc,
528 struct ieee80211_bss_conf *bss_conf)
530 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
531 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
533 ath_dbg(common, BEACON,
534 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
536 cur_conf->beacon_interval = bss_conf->beacon_int;
537 cur_conf->dtim_period = bss_conf->dtim_period;
538 cur_conf->dtim_count = 1;
539 cur_conf->ibss_creator = bss_conf->ibss_creator;
542 * It looks like mac80211 may end up using beacon interval of zero in
543 * some cases (at least for mesh point). Avoid getting into an
544 * infinite loop by using a bit safer value instead. To be safe,
545 * do sanity check on beacon interval for all operating modes.
547 if (cur_conf->beacon_interval == 0)
548 cur_conf->beacon_interval = 100;
550 cur_conf->bmiss_timeout =
551 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
554 * We don't parse dtim period from mac80211 during the driver
555 * initialization as it breaks association with hidden-ssid
556 * AP and it causes latency in roaming
558 if (cur_conf->dtim_period == 0)
559 cur_conf->dtim_period = 1;
563 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
566 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
567 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
568 struct ath_hw *ah = sc->sc_ah;
569 struct ath_common *common = ath9k_hw_common(ah);
571 bool skip_beacon = false;
573 if (vif->type == NL80211_IFTYPE_AP)
574 ath9k_set_tsfadjust(sc, vif);
576 if (!ath9k_allow_beacon_config(sc, vif))
579 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
580 ath9k_cache_beacon_config(sc, bss_conf);
581 ath9k_set_beacon(sc);
582 set_bit(ATH_OP_BEACONS, &common->op_flags);
587 * Take care of multiple interfaces when
588 * enabling/disabling SWBA.
590 if (changed & BSS_CHANGED_BEACON_ENABLED) {
591 if (!bss_conf->enable_beacon &&
592 (sc->nbcnvifs <= 1)) {
593 cur_conf->enable_beacon = false;
594 } else if (bss_conf->enable_beacon) {
595 cur_conf->enable_beacon = true;
596 ath9k_cache_beacon_config(sc, bss_conf);
601 * Configure the HW beacon registers only when we have a valid
604 if (cur_conf->beacon_interval) {
606 * If we are joining an existing IBSS network, start beaconing
607 * only after a TSF-sync has taken place. Ensure that this
608 * happens by setting the appropriate flags.
610 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
611 bss_conf->enable_beacon) {
612 spin_lock_irqsave(&sc->sc_pm_lock, flags);
613 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
614 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
617 ath9k_set_beacon(sc);
621 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
622 * here, it is done in ath9k_beacon_config_adhoc().
624 if (cur_conf->enable_beacon && !skip_beacon)
625 set_bit(ATH_OP_BEACONS, &common->op_flags);
627 clear_bit(ATH_OP_BEACONS, &common->op_flags);
631 void ath9k_set_beacon(struct ath_softc *sc)
633 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
634 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
636 switch (sc->sc_ah->opmode) {
637 case NL80211_IFTYPE_AP:
638 case NL80211_IFTYPE_MESH_POINT:
639 ath9k_beacon_config_ap(sc, cur_conf);
641 case NL80211_IFTYPE_ADHOC:
642 ath9k_beacon_config_adhoc(sc, cur_conf);
644 case NL80211_IFTYPE_STATION:
645 ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
648 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");