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1/*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 *
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.
7 *
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.
15 */
16
17#include <linux/dma-mapping.h>
18#include "ath9k.h"
19
20#define FUDGE 2
21
22static void ath9k_reset_beacon_status(struct ath_softc *sc)
23{
24 sc->beacon.tx_processed = false;
25 sc->beacon.tx_last = false;
26}
27
28/*
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
32*/
33static void ath9k_beaconq_config(struct ath_softc *sc)
34{
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;
38 struct ath_txq *txq;
39
40 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
41
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. */
45 qi.tqi_aifs = 1;
46 qi.tqi_cwmin = 0;
47 qi.tqi_cwmax = 0;
48 } else {
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 == 20)
54 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
55 else
56 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
57 qi.tqi_cwmax = qi_be.tqi_cwmax;
58 }
59
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");
62 } else {
63 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
64 }
65}
66
67/*
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.
71*/
72static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
73 struct ath_buf *bf, int rateidx)
74{
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;
81 u8 i, rate = 0;
82
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;
87
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;
96
97 info.buf_addr[0] = bf->bf_buf_addr;
98 info.buf_len[0] = roundup(skb->len, 4);
99
100 info.is_first = true;
101 info.is_last = true;
102
103 info.qcu = sc->beacon.beaconq;
104
105 info.rates[0].Tries = 1;
106 info.rates[0].Rate = rate;
107 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
108
109 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
110}
111
112static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
113 struct ieee80211_vif *vif)
114{
115 struct ath_softc *sc = hw->priv;
116 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
117 struct ath_buf *bf;
118 struct ath_vif *avp = (void *)vif->drv_priv;
119 struct sk_buff *skb;
120 struct ath_txq *cabq = sc->beacon.cabq;
121 struct ieee80211_tx_info *info;
122 struct ieee80211_mgmt *mgmt_hdr;
123 int cabq_depth;
124
125 if (avp->av_bcbuf == NULL)
126 return NULL;
127
128 bf = avp->av_bcbuf;
129 skb = bf->bf_mpdu;
130 if (skb) {
131 dma_unmap_single(sc->dev, bf->bf_buf_addr,
132 skb->len, DMA_TO_DEVICE);
133 dev_kfree_skb_any(skb);
134 bf->bf_buf_addr = 0;
135 bf->bf_mpdu = NULL;
136 }
137
138 skb = ieee80211_beacon_get(hw, vif, 0);
139 if (skb == NULL)
140 return NULL;
141
142 bf->bf_mpdu = skb;
143
144 mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
145 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
146
147 info = IEEE80211_SKB_CB(skb);
148
149 ath_assign_seq(common, skb);
150
151 /* Always assign NOA attr when MCC enabled */
152 if (ath9k_is_chanctx_enabled())
153 ath9k_beacon_add_noa(sc, avp, skb);
154
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);
159 bf->bf_mpdu = NULL;
160 bf->bf_buf_addr = 0;
161 ath_err(common, "dma_mapping_error on beaconing\n");
162 return NULL;
163 }
164
165 skb = ieee80211_get_buffered_bc(hw, vif);
166
167 /*
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.
174 */
175 spin_lock_bh(&cabq->axq_lock);
176 cabq_depth = cabq->axq_depth;
177 spin_unlock_bh(&cabq->axq_lock);
178
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);
184 }
185 }
186
187 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
188
189 if (skb)
190 ath_tx_cabq(hw, vif, skb);
191
192 return bf;
193}
194
195void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
196{
197 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
198 struct ath_vif *avp = (void *)vif->drv_priv;
199 int slot;
200
201 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
202 list_del(&avp->av_bcbuf->list);
203
204 for (slot = 0; slot < ATH_BCBUF; slot++) {
205 if (sc->beacon.bslot[slot] == NULL) {
206 avp->av_bslot = slot;
207 break;
208 }
209 }
210
211 sc->beacon.bslot[avp->av_bslot] = vif;
212
213 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
214 avp->av_bslot);
215}
216
217void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
218{
219 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
220 struct ath_vif *avp = (void *)vif->drv_priv;
221 struct ath_buf *bf = avp->av_bcbuf;
222
223 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
224 avp->av_bslot);
225
226 tasklet_disable(&sc->bcon_tasklet);
227
228 if (bf && bf->bf_mpdu) {
229 struct sk_buff *skb = bf->bf_mpdu;
230 dma_unmap_single(sc->dev, bf->bf_buf_addr,
231 skb->len, DMA_TO_DEVICE);
232 dev_kfree_skb_any(skb);
233 bf->bf_mpdu = NULL;
234 bf->bf_buf_addr = 0;
235 }
236
237 avp->av_bcbuf = NULL;
238 sc->beacon.bslot[avp->av_bslot] = NULL;
239 list_add_tail(&bf->list, &sc->beacon.bbuf);
240
241 tasklet_enable(&sc->bcon_tasklet);
242}
243
244void ath9k_beacon_ensure_primary_slot(struct ath_softc *sc)
245{
246 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
247 struct ieee80211_vif *vif;
248 struct ath_vif *avp;
249 s64 tsfadjust;
250 u32 offset;
251 int first_slot = ATH_BCBUF;
252 int slot;
253
254 tasklet_disable_in_atomic(&sc->bcon_tasklet);
255
256 /* Find first taken slot. */
257 for (slot = 0; slot < ATH_BCBUF; slot++) {
258 if (sc->beacon.bslot[slot]) {
259 first_slot = slot;
260 break;
261 }
262 }
263 if (first_slot == 0)
264 goto out;
265
266 /* Re-enumarate all slots, moving them forward. */
267 for (slot = 0; slot < ATH_BCBUF; slot++) {
268 if (slot + first_slot < ATH_BCBUF) {
269 vif = sc->beacon.bslot[slot + first_slot];
270 sc->beacon.bslot[slot] = vif;
271
272 if (vif) {
273 avp = (void *)vif->drv_priv;
274 avp->av_bslot = slot;
275 }
276 } else {
277 sc->beacon.bslot[slot] = NULL;
278 }
279 }
280
281 vif = sc->beacon.bslot[0];
282 if (WARN_ON(!vif))
283 goto out;
284
285 /* Get the tsf_adjust value for the new first slot. */
286 avp = (void *)vif->drv_priv;
287 tsfadjust = le64_to_cpu(avp->tsf_adjust);
288
289 ath_dbg(common, CONFIG,
290 "Adjusting global TSF after beacon slot reassignment: %lld\n",
291 (signed long long)tsfadjust);
292
293 /* Modify TSF as required and update the HW. */
294 avp->chanctx->tsf_val += tsfadjust;
295 if (sc->cur_chan == avp->chanctx) {
296 offset = ath9k_hw_get_tsf_offset(&avp->chanctx->tsf_ts, NULL);
297 ath9k_hw_settsf64(sc->sc_ah, avp->chanctx->tsf_val + offset);
298 }
299
300 /* The slots tsf_adjust will be updated by ath9k_beacon_config later. */
301
302out:
303 tasklet_enable(&sc->bcon_tasklet);
304}
305
306static int ath9k_beacon_choose_slot(struct ath_softc *sc)
307{
308 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
309 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
310 u16 intval;
311 u32 tsftu;
312 u64 tsf;
313 int slot;
314
315 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP &&
316 sc->sc_ah->opmode != NL80211_IFTYPE_MESH_POINT) {
317 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
318 ath9k_hw_gettsf64(sc->sc_ah));
319 return 0;
320 }
321
322 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
323 tsf = ath9k_hw_gettsf64(sc->sc_ah);
324 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
325 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
326 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
327
328 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
329 slot, tsf, tsftu / ATH_BCBUF);
330
331 return slot;
332}
333
334static void ath9k_set_tsfadjust(struct ath_softc *sc,
335 struct ath_beacon_config *cur_conf)
336{
337 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
338 s64 tsfadjust;
339 int slot;
340
341 for (slot = 0; slot < ATH_BCBUF; slot++) {
342 struct ath_vif *avp;
343
344 if (!sc->beacon.bslot[slot])
345 continue;
346
347 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
348
349 /* tsf_adjust is added to the TSF value. We send out the
350 * beacon late, so need to adjust the TSF starting point to be
351 * later in time (i.e. the theoretical first beacon has a TSF
352 * of 0 after correction).
353 */
354 tsfadjust = cur_conf->beacon_interval * avp->av_bslot;
355 tsfadjust = -TU_TO_USEC(tsfadjust) / ATH_BCBUF;
356 avp->tsf_adjust = cpu_to_le64(tsfadjust);
357
358 ath_dbg(common, CONFIG, "tsfadjust is: %lld for bslot: %d\n",
359 (signed long long)tsfadjust, avp->av_bslot);
360 }
361}
362
363bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
364{
365 if (!vif || !vif->bss_conf.csa_active)
366 return false;
367
368 if (!ieee80211_beacon_cntdwn_is_complete(vif))
369 return false;
370
371 ieee80211_csa_finish(vif);
372 return true;
373}
374
375static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
376{
377 struct ath_softc *sc = data;
378 ath9k_csa_is_finished(sc, vif);
379}
380
381void ath9k_csa_update(struct ath_softc *sc)
382{
383 ieee80211_iterate_active_interfaces_atomic(sc->hw,
384 IEEE80211_IFACE_ITER_NORMAL,
385 ath9k_csa_update_vif, sc);
386}
387
388void ath9k_beacon_tasklet(struct tasklet_struct *t)
389{
390 struct ath_softc *sc = from_tasklet(sc, t, bcon_tasklet);
391 struct ath_hw *ah = sc->sc_ah;
392 struct ath_common *common = ath9k_hw_common(ah);
393 struct ath_buf *bf = NULL;
394 struct ieee80211_vif *vif;
395 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
396 int slot;
397
398 if (test_bit(ATH_OP_HW_RESET, &common->op_flags)) {
399 ath_dbg(common, RESET,
400 "reset work is pending, skip beaconing now\n");
401 return;
402 }
403
404 /*
405 * Check if the previous beacon has gone out. If
406 * not don't try to post another, skip this period
407 * and wait for the next. Missed beacons indicate
408 * a problem and should not occur. If we miss too
409 * many consecutive beacons reset the device.
410 */
411 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
412 sc->beacon.bmisscnt++;
413
414 ath9k_hw_check_nav(ah);
415
416 /*
417 * If the previous beacon has not been transmitted
418 * and a MAC/BB hang has been identified, return
419 * here because a chip reset would have been
420 * initiated.
421 */
422 if (!ath_hw_check(sc))
423 return;
424
425 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
426 ath_dbg(common, BSTUCK,
427 "missed %u consecutive beacons\n",
428 sc->beacon.bmisscnt);
429 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
430 if (sc->beacon.bmisscnt > 3)
431 ath9k_hw_bstuck_nfcal(ah);
432 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
433 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
434 sc->beacon.bmisscnt = 0;
435 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
436 }
437
438 return;
439 }
440
441 slot = ath9k_beacon_choose_slot(sc);
442 vif = sc->beacon.bslot[slot];
443
444 /* EDMA devices check that in the tx completion function. */
445 if (!edma) {
446 if (ath9k_is_chanctx_enabled()) {
447 ath_chanctx_beacon_sent_ev(sc,
448 ATH_CHANCTX_EVENT_BEACON_SENT);
449 }
450
451 if (ath9k_csa_is_finished(sc, vif))
452 return;
453 }
454
455 if (!vif || !vif->bss_conf.enable_beacon)
456 return;
457
458 if (ath9k_is_chanctx_enabled()) {
459 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE);
460 }
461
462 bf = ath9k_beacon_generate(sc->hw, vif);
463
464 if (sc->beacon.bmisscnt != 0) {
465 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
466 sc->beacon.bmisscnt);
467 sc->beacon.bmisscnt = 0;
468 }
469
470 /*
471 * Handle slot time change when a non-ERP station joins/leaves
472 * an 11g network. The 802.11 layer notifies us via callback,
473 * we mark updateslot, then wait one beacon before effecting
474 * the change. This gives associated stations at least one
475 * beacon interval to note the state change.
476 *
477 * NB: The slot time change state machine is clocked according
478 * to whether we are bursting or staggering beacons. We
479 * recognize the request to update and record the current
480 * slot then don't transition until that slot is reached
481 * again. If we miss a beacon for that slot then we'll be
482 * slow to transition but we'll be sure at least one beacon
483 * interval has passed. When bursting slot is always left
484 * set to ATH_BCBUF so this check is a noop.
485 */
486 if (sc->beacon.updateslot == UPDATE) {
487 sc->beacon.updateslot = COMMIT;
488 sc->beacon.slotupdate = slot;
489 } else if (sc->beacon.updateslot == COMMIT &&
490 sc->beacon.slotupdate == slot) {
491 ah->slottime = sc->beacon.slottime;
492 ath9k_hw_init_global_settings(ah);
493 sc->beacon.updateslot = OK;
494 }
495
496 if (bf) {
497 ath9k_reset_beacon_status(sc);
498
499 ath_dbg(common, BEACON,
500 "Transmitting beacon for slot: %d\n", slot);
501
502 /* NB: cabq traffic should already be queued and primed */
503 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
504
505 if (!edma)
506 ath9k_hw_txstart(ah, sc->beacon.beaconq);
507 }
508}
509
510/*
511 * Both nexttbtt and intval have to be in usecs.
512 */
513static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
514 u32 intval)
515{
516 struct ath_hw *ah = sc->sc_ah;
517
518 ath9k_hw_disable_interrupts(ah);
519 ath9k_beaconq_config(sc);
520 ath9k_hw_beaconinit(ah, nexttbtt, intval);
521 ah->imask |= ATH9K_INT_SWBA;
522 sc->beacon.bmisscnt = 0;
523 ath9k_hw_set_interrupts(ah);
524 ath9k_hw_enable_interrupts(ah);
525}
526
527static void ath9k_beacon_stop(struct ath_softc *sc)
528{
529 ath9k_hw_disable_interrupts(sc->sc_ah);
530 sc->sc_ah->imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);
531 sc->beacon.bmisscnt = 0;
532 ath9k_hw_set_interrupts(sc->sc_ah);
533 ath9k_hw_enable_interrupts(sc->sc_ah);
534}
535
536/*
537 * For multi-bss ap support beacons are either staggered evenly over N slots or
538 * burst together. For the former arrange for the SWBA to be delivered for each
539 * slot. Slots that are not occupied will generate nothing.
540 */
541static void ath9k_beacon_config_ap(struct ath_softc *sc,
542 struct ath_beacon_config *conf)
543{
544 struct ath_hw *ah = sc->sc_ah;
545
546 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
547 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval);
548}
549
550static void ath9k_beacon_config_sta(struct ath_hw *ah,
551 struct ath_beacon_config *conf)
552{
553 struct ath9k_beacon_state bs;
554
555 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
556 return;
557
558 ath9k_hw_disable_interrupts(ah);
559 ath9k_hw_set_sta_beacon_timers(ah, &bs);
560 ah->imask |= ATH9K_INT_BMISS;
561
562 ath9k_hw_set_interrupts(ah);
563 ath9k_hw_enable_interrupts(ah);
564}
565
566static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
567 struct ath_beacon_config *conf)
568{
569 struct ath_hw *ah = sc->sc_ah;
570 struct ath_common *common = ath9k_hw_common(ah);
571
572 ath9k_reset_beacon_status(sc);
573
574 ath9k_cmn_beacon_config_adhoc(ah, conf);
575
576 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval);
577
578 /*
579 * Set the global 'beacon has been configured' flag for the
580 * joiner case in IBSS mode.
581 */
582 if (!conf->ibss_creator && conf->enable_beacon)
583 set_bit(ATH_OP_BEACONS, &common->op_flags);
584}
585
586static void ath9k_cache_beacon_config(struct ath_softc *sc,
587 struct ath_chanctx *ctx,
588 struct ieee80211_vif *vif)
589{
590 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
591 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
592 struct ath_beacon_config *cur_conf = &ctx->beacon;
593
594 ath_dbg(common, BEACON,
595 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
596
597 cur_conf->beacon_interval = bss_conf->beacon_int;
598 cur_conf->dtim_period = bss_conf->dtim_period;
599 cur_conf->dtim_count = 1;
600 cur_conf->ibss_creator = vif->cfg.ibss_creator;
601
602 /*
603 * It looks like mac80211 may end up using beacon interval of zero in
604 * some cases (at least for mesh point). Avoid getting into an
605 * infinite loop by using a bit safer value instead. To be safe,
606 * do sanity check on beacon interval for all operating modes.
607 */
608 if (cur_conf->beacon_interval == 0)
609 cur_conf->beacon_interval = 100;
610
611 cur_conf->bmiss_timeout =
612 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
613
614 /*
615 * We don't parse dtim period from mac80211 during the driver
616 * initialization as it breaks association with hidden-ssid
617 * AP and it causes latency in roaming
618 */
619 if (cur_conf->dtim_period == 0)
620 cur_conf->dtim_period = 1;
621
622 ath9k_set_tsfadjust(sc, cur_conf);
623}
624
625void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *main_vif,
626 bool beacons)
627{
628 struct ath_hw *ah = sc->sc_ah;
629 struct ath_common *common = ath9k_hw_common(ah);
630 struct ath_vif *avp;
631 struct ath_chanctx *ctx;
632 struct ath_beacon_config *cur_conf;
633 unsigned long flags;
634 bool enabled;
635 bool skip_beacon = false;
636
637 if (!beacons) {
638 clear_bit(ATH_OP_BEACONS, &common->op_flags);
639 ath9k_beacon_stop(sc);
640 return;
641 }
642
643 if (WARN_ON(!main_vif))
644 return;
645
646 avp = (void *)main_vif->drv_priv;
647 ctx = avp->chanctx;
648 cur_conf = &ctx->beacon;
649 enabled = cur_conf->enable_beacon;
650 cur_conf->enable_beacon = beacons;
651
652 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
653 ath9k_cache_beacon_config(sc, ctx, main_vif);
654
655 ath9k_set_beacon(sc);
656 set_bit(ATH_OP_BEACONS, &common->op_flags);
657 return;
658 }
659
660 /* Update the beacon configuration. */
661 ath9k_cache_beacon_config(sc, ctx, main_vif);
662
663 /*
664 * Configure the HW beacon registers only when we have a valid
665 * beacon interval.
666 */
667 if (cur_conf->beacon_interval) {
668 /* Special case to sync the TSF when joining an existing IBSS.
669 * This is only done if no AP interface is active.
670 * Note that mac80211 always resets the TSF when creating a new
671 * IBSS interface.
672 */
673 if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC &&
674 !enabled && beacons && !main_vif->cfg.ibss_creator) {
675 spin_lock_irqsave(&sc->sc_pm_lock, flags);
676 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
677 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
678 skip_beacon = true;
679 }
680
681 /*
682 * Do not set the ATH_OP_BEACONS flag for IBSS joiner mode
683 * here, it is done in ath9k_beacon_config_adhoc().
684 */
685 if (beacons && !skip_beacon) {
686 set_bit(ATH_OP_BEACONS, &common->op_flags);
687 ath9k_set_beacon(sc);
688 } else {
689 clear_bit(ATH_OP_BEACONS, &common->op_flags);
690 ath9k_beacon_stop(sc);
691 }
692 } else {
693 clear_bit(ATH_OP_BEACONS, &common->op_flags);
694 ath9k_beacon_stop(sc);
695 }
696}
697
698void ath9k_set_beacon(struct ath_softc *sc)
699{
700 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
701 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
702
703 switch (sc->sc_ah->opmode) {
704 case NL80211_IFTYPE_AP:
705 case NL80211_IFTYPE_MESH_POINT:
706 ath9k_beacon_config_ap(sc, cur_conf);
707 break;
708 case NL80211_IFTYPE_ADHOC:
709 ath9k_beacon_config_adhoc(sc, cur_conf);
710 break;
711 case NL80211_IFTYPE_STATION:
712 ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
713 break;
714 default:
715 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
716 return;
717 }
718}
1/*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 *
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.
7 *
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.
15 */
16
17#include <linux/dma-mapping.h>
18#include "ath9k.h"
19
20#define FUDGE 2
21
22static void ath9k_reset_beacon_status(struct ath_softc *sc)
23{
24 sc->beacon.tx_processed = false;
25 sc->beacon.tx_last = false;
26}
27
28/*
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
32*/
33int ath_beaconq_config(struct ath_softc *sc)
34{
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;
38 struct ath_txq *txq;
39
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. */
43 qi.tqi_aifs = 1;
44 qi.tqi_cwmin = 0;
45 qi.tqi_cwmax = 0;
46 } else {
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;
53 }
54
55 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
56 ath_err(common,
57 "Unable to update h/w beacon queue parameters\n");
58 return 0;
59 } else {
60 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
61 return 1;
62 }
63}
64
65/*
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.
69*/
70static void ath_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
71 struct ath_buf *bf, int rateidx)
72{
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;
79 u8 rate = 0;
80
81 ath9k_reset_beacon_status(sc);
82
83 sband = &sc->sbands[common->hw->conf.channel->band];
84 rate = sband->bitrates[rateidx].hw_value;
85 if (vif->bss_conf.use_short_preamble)
86 rate |= sband->bitrates[rateidx].hw_value_short;
87
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;
95
96 info.buf_addr[0] = bf->bf_buf_addr;
97 info.buf_len[0] = roundup(skb->len, 4);
98
99 info.is_first = true;
100 info.is_last = true;
101
102 info.qcu = sc->beacon.beaconq;
103
104 info.rates[0].Tries = 1;
105 info.rates[0].Rate = rate;
106 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
107
108 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
109}
110
111static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
112{
113 struct ath_softc *sc = hw->priv;
114 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
115 struct ath_tx_control txctl;
116
117 memset(&txctl, 0, sizeof(struct ath_tx_control));
118 txctl.txq = sc->beacon.cabq;
119
120 ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb);
121
122 if (ath_tx_start(hw, skb, &txctl) != 0) {
123 ath_dbg(common, XMIT, "CABQ TX failed\n");
124 dev_kfree_skb_any(skb);
125 }
126}
127
128static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
129 struct ieee80211_vif *vif)
130{
131 struct ath_softc *sc = hw->priv;
132 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
133 struct ath_buf *bf;
134 struct ath_vif *avp;
135 struct sk_buff *skb;
136 struct ath_txq *cabq;
137 struct ieee80211_tx_info *info;
138 int cabq_depth;
139
140 ath9k_reset_beacon_status(sc);
141
142 avp = (void *)vif->drv_priv;
143 cabq = sc->beacon.cabq;
144
145 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
146 return NULL;
147
148 /* Release the old beacon first */
149
150 bf = avp->av_bcbuf;
151 skb = bf->bf_mpdu;
152 if (skb) {
153 dma_unmap_single(sc->dev, bf->bf_buf_addr,
154 skb->len, DMA_TO_DEVICE);
155 dev_kfree_skb_any(skb);
156 bf->bf_buf_addr = 0;
157 }
158
159 /* Get a new beacon from mac80211 */
160
161 skb = ieee80211_beacon_get(hw, vif);
162 bf->bf_mpdu = skb;
163 if (skb == NULL)
164 return NULL;
165 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
166 avp->tsf_adjust;
167
168 info = IEEE80211_SKB_CB(skb);
169 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
170 /*
171 * TODO: make sure the seq# gets assigned properly (vs. other
172 * TX frames)
173 */
174 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
175 sc->tx.seq_no += 0x10;
176 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
177 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
178 }
179
180 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
181 skb->len, DMA_TO_DEVICE);
182 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
183 dev_kfree_skb_any(skb);
184 bf->bf_mpdu = NULL;
185 bf->bf_buf_addr = 0;
186 ath_err(common, "dma_mapping_error on beaconing\n");
187 return NULL;
188 }
189
190 skb = ieee80211_get_buffered_bc(hw, vif);
191
192 /*
193 * if the CABQ traffic from previous DTIM is pending and the current
194 * beacon is also a DTIM.
195 * 1) if there is only one vif let the cab traffic continue.
196 * 2) if there are more than one vif and we are using staggered
197 * beacons, then drain the cabq by dropping all the frames in
198 * the cabq so that the current vifs cab traffic can be scheduled.
199 */
200 spin_lock_bh(&cabq->axq_lock);
201 cabq_depth = cabq->axq_depth;
202 spin_unlock_bh(&cabq->axq_lock);
203
204 if (skb && cabq_depth) {
205 if (sc->nvifs > 1) {
206 ath_dbg(common, BEACON,
207 "Flushing previous cabq traffic\n");
208 ath_draintxq(sc, cabq, false);
209 }
210 }
211
212 ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
213
214 while (skb) {
215 ath_tx_cabq(hw, skb);
216 skb = ieee80211_get_buffered_bc(hw, vif);
217 }
218
219 return bf;
220}
221
222int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
223{
224 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
225 struct ath_vif *avp;
226 struct ath_buf *bf;
227 struct sk_buff *skb;
228 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
229 __le64 tstamp;
230
231 avp = (void *)vif->drv_priv;
232
233 /* Allocate a beacon descriptor if we haven't done so. */
234 if (!avp->av_bcbuf) {
235 /* Allocate beacon state for hostap/ibss. We know
236 * a buffer is available. */
237 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
238 struct ath_buf, list);
239 list_del(&avp->av_bcbuf->list);
240
241 if (ath9k_uses_beacons(vif->type)) {
242 int slot;
243 /*
244 * Assign the vif to a beacon xmit slot. As
245 * above, this cannot fail to find one.
246 */
247 avp->av_bslot = 0;
248 for (slot = 0; slot < ATH_BCBUF; slot++)
249 if (sc->beacon.bslot[slot] == NULL) {
250 avp->av_bslot = slot;
251 avp->is_bslot_active = false;
252
253 /* NB: keep looking for a double slot */
254 if (slot == 0 || !sc->beacon.bslot[slot-1])
255 break;
256 }
257 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
258 sc->beacon.bslot[avp->av_bslot] = vif;
259 sc->nbcnvifs++;
260 }
261 }
262
263 /* release the previous beacon frame, if it already exists. */
264 bf = avp->av_bcbuf;
265 if (bf->bf_mpdu != NULL) {
266 skb = bf->bf_mpdu;
267 dma_unmap_single(sc->dev, bf->bf_buf_addr,
268 skb->len, DMA_TO_DEVICE);
269 dev_kfree_skb_any(skb);
270 bf->bf_mpdu = NULL;
271 bf->bf_buf_addr = 0;
272 }
273
274 /* NB: the beacon data buffer must be 32-bit aligned. */
275 skb = ieee80211_beacon_get(sc->hw, vif);
276 if (skb == NULL)
277 return -ENOMEM;
278
279 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
280 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
281 /* Calculate a TSF adjustment factor required for staggered beacons. */
282 if (avp->av_bslot > 0) {
283 u64 tsfadjust;
284 int intval;
285
286 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
287
288 /*
289 * Calculate the TSF offset for this beacon slot, i.e., the
290 * number of usecs that need to be added to the timestamp field
291 * in Beacon and Probe Response frames. Beacon slot 0 is
292 * processed at the correct offset, so it does not require TSF
293 * adjustment. Other slots are adjusted to get the timestamp
294 * close to the TBTT for the BSS.
295 */
296 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
297 avp->tsf_adjust = cpu_to_le64(tsfadjust);
298
299 ath_dbg(common, BEACON,
300 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
301 avp->av_bslot, intval, (unsigned long long)tsfadjust);
302
303 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
304 avp->tsf_adjust;
305 } else
306 avp->tsf_adjust = cpu_to_le64(0);
307
308 bf->bf_mpdu = skb;
309 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
310 skb->len, DMA_TO_DEVICE);
311 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
312 dev_kfree_skb_any(skb);
313 bf->bf_mpdu = NULL;
314 bf->bf_buf_addr = 0;
315 ath_err(common, "dma_mapping_error on beacon alloc\n");
316 return -ENOMEM;
317 }
318 avp->is_bslot_active = true;
319
320 return 0;
321}
322
323void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
324{
325 if (avp->av_bcbuf != NULL) {
326 struct ath_buf *bf;
327
328 avp->is_bslot_active = false;
329 if (avp->av_bslot != -1) {
330 sc->beacon.bslot[avp->av_bslot] = NULL;
331 sc->nbcnvifs--;
332 avp->av_bslot = -1;
333 }
334
335 bf = avp->av_bcbuf;
336 if (bf->bf_mpdu != NULL) {
337 struct sk_buff *skb = bf->bf_mpdu;
338 dma_unmap_single(sc->dev, bf->bf_buf_addr,
339 skb->len, DMA_TO_DEVICE);
340 dev_kfree_skb_any(skb);
341 bf->bf_mpdu = NULL;
342 bf->bf_buf_addr = 0;
343 }
344 list_add_tail(&bf->list, &sc->beacon.bbuf);
345
346 avp->av_bcbuf = NULL;
347 }
348}
349
350void ath_beacon_tasklet(unsigned long data)
351{
352 struct ath_softc *sc = (struct ath_softc *)data;
353 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
354 struct ath_hw *ah = sc->sc_ah;
355 struct ath_common *common = ath9k_hw_common(ah);
356 struct ath_buf *bf = NULL;
357 struct ieee80211_vif *vif;
358 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
359 int slot;
360 u32 bfaddr, bc = 0;
361
362 if (work_pending(&sc->hw_reset_work)) {
363 ath_dbg(common, RESET,
364 "reset work is pending, skip beaconing now\n");
365 return;
366 }
367 /*
368 * Check if the previous beacon has gone out. If
369 * not don't try to post another, skip this period
370 * and wait for the next. Missed beacons indicate
371 * a problem and should not occur. If we miss too
372 * many consecutive beacons reset the device.
373 */
374 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
375 sc->beacon.bmisscnt++;
376
377 if (!ath9k_hw_check_alive(ah))
378 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
379
380 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
381 ath_dbg(common, BSTUCK,
382 "missed %u consecutive beacons\n",
383 sc->beacon.bmisscnt);
384 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
385 if (sc->beacon.bmisscnt > 3)
386 ath9k_hw_bstuck_nfcal(ah);
387 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
388 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
389 sc->beacon.bmisscnt = 0;
390 sc->sc_flags |= SC_OP_TSF_RESET;
391 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
392 }
393
394 return;
395 }
396
397 /*
398 * Generate beacon frames. we are sending frames
399 * staggered so calculate the slot for this frame based
400 * on the tsf to safeguard against missing an swba.
401 */
402
403
404 if (ah->opmode == NL80211_IFTYPE_AP) {
405 u16 intval;
406 u32 tsftu;
407 u64 tsf;
408
409 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
410 tsf = ath9k_hw_gettsf64(ah);
411 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
412 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
413 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
414 vif = sc->beacon.bslot[slot];
415
416 ath_dbg(common, BEACON,
417 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
418 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
419 } else {
420 slot = 0;
421 vif = sc->beacon.bslot[slot];
422 }
423
424
425 bfaddr = 0;
426 if (vif) {
427 bf = ath_beacon_generate(sc->hw, vif);
428 if (bf != NULL) {
429 bfaddr = bf->bf_daddr;
430 bc = 1;
431 }
432
433 if (sc->beacon.bmisscnt != 0) {
434 ath_dbg(common, BSTUCK,
435 "resume beacon xmit after %u misses\n",
436 sc->beacon.bmisscnt);
437 sc->beacon.bmisscnt = 0;
438 }
439 }
440
441 /*
442 * Handle slot time change when a non-ERP station joins/leaves
443 * an 11g network. The 802.11 layer notifies us via callback,
444 * we mark updateslot, then wait one beacon before effecting
445 * the change. This gives associated stations at least one
446 * beacon interval to note the state change.
447 *
448 * NB: The slot time change state machine is clocked according
449 * to whether we are bursting or staggering beacons. We
450 * recognize the request to update and record the current
451 * slot then don't transition until that slot is reached
452 * again. If we miss a beacon for that slot then we'll be
453 * slow to transition but we'll be sure at least one beacon
454 * interval has passed. When bursting slot is always left
455 * set to ATH_BCBUF so this check is a noop.
456 */
457 if (sc->beacon.updateslot == UPDATE) {
458 sc->beacon.updateslot = COMMIT; /* commit next beacon */
459 sc->beacon.slotupdate = slot;
460 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
461 ah->slottime = sc->beacon.slottime;
462 ath9k_hw_init_global_settings(ah);
463 sc->beacon.updateslot = OK;
464 }
465 if (bfaddr != 0) {
466 /* NB: cabq traffic should already be queued and primed */
467 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
468
469 if (!edma)
470 ath9k_hw_txstart(ah, sc->beacon.beaconq);
471
472 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
473 }
474}
475
476static void ath9k_beacon_init(struct ath_softc *sc,
477 u32 next_beacon,
478 u32 beacon_period)
479{
480 if (sc->sc_flags & SC_OP_TSF_RESET) {
481 ath9k_ps_wakeup(sc);
482 ath9k_hw_reset_tsf(sc->sc_ah);
483 }
484
485 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
486
487 if (sc->sc_flags & SC_OP_TSF_RESET) {
488 ath9k_ps_restore(sc);
489 sc->sc_flags &= ~SC_OP_TSF_RESET;
490 }
491}
492
493/*
494 * For multi-bss ap support beacons are either staggered evenly over N slots or
495 * burst together. For the former arrange for the SWBA to be delivered for each
496 * slot. Slots that are not occupied will generate nothing.
497 */
498static void ath_beacon_config_ap(struct ath_softc *sc,
499 struct ath_beacon_config *conf)
500{
501 struct ath_hw *ah = sc->sc_ah;
502 u32 nexttbtt, intval;
503
504 /* NB: the beacon interval is kept internally in TU's */
505 intval = TU_TO_USEC(conf->beacon_interval);
506 intval /= ATH_BCBUF; /* for staggered beacons */
507 nexttbtt = intval;
508
509 /*
510 * In AP mode we enable the beacon timers and SWBA interrupts to
511 * prepare beacon frames.
512 */
513 ah->imask |= ATH9K_INT_SWBA;
514 ath_beaconq_config(sc);
515
516 /* Set the computed AP beacon timers */
517
518 ath9k_hw_disable_interrupts(ah);
519 sc->sc_flags |= SC_OP_TSF_RESET;
520 ath9k_beacon_init(sc, nexttbtt, intval);
521 sc->beacon.bmisscnt = 0;
522 ath9k_hw_set_interrupts(ah);
523 ath9k_hw_enable_interrupts(ah);
524}
525
526/*
527 * This sets up the beacon timers according to the timestamp of the last
528 * received beacon and the current TSF, configures PCF and DTIM
529 * handling, programs the sleep registers so the hardware will wakeup in
530 * time to receive beacons, and configures the beacon miss handling so
531 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
532 * we've associated with.
533 */
534static void ath_beacon_config_sta(struct ath_softc *sc,
535 struct ath_beacon_config *conf)
536{
537 struct ath_hw *ah = sc->sc_ah;
538 struct ath_common *common = ath9k_hw_common(ah);
539 struct ath9k_beacon_state bs;
540 int dtimperiod, dtimcount, sleepduration;
541 int cfpperiod, cfpcount;
542 u32 nexttbtt = 0, intval, tsftu;
543 u64 tsf;
544 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
545
546 /* No need to configure beacon if we are not associated */
547 if (!common->curaid) {
548 ath_dbg(common, BEACON,
549 "STA is not yet associated..skipping beacon config\n");
550 return;
551 }
552
553 memset(&bs, 0, sizeof(bs));
554 intval = conf->beacon_interval;
555
556 /*
557 * Setup dtim and cfp parameters according to
558 * last beacon we received (which may be none).
559 */
560 dtimperiod = conf->dtim_period;
561 dtimcount = conf->dtim_count;
562 if (dtimcount >= dtimperiod) /* NB: sanity check */
563 dtimcount = 0;
564 cfpperiod = 1; /* NB: no PCF support yet */
565 cfpcount = 0;
566
567 sleepduration = conf->listen_interval * intval;
568
569 /*
570 * Pull nexttbtt forward to reflect the current
571 * TSF and calculate dtim+cfp state for the result.
572 */
573 tsf = ath9k_hw_gettsf64(ah);
574 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
575
576 num_beacons = tsftu / intval + 1;
577 offset = tsftu % intval;
578 nexttbtt = tsftu - offset;
579 if (offset)
580 nexttbtt += intval;
581
582 /* DTIM Beacon every dtimperiod Beacon */
583 dtim_dec_count = num_beacons % dtimperiod;
584 /* CFP every cfpperiod DTIM Beacon */
585 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
586 if (dtim_dec_count)
587 cfp_dec_count++;
588
589 dtimcount -= dtim_dec_count;
590 if (dtimcount < 0)
591 dtimcount += dtimperiod;
592
593 cfpcount -= cfp_dec_count;
594 if (cfpcount < 0)
595 cfpcount += cfpperiod;
596
597 bs.bs_intval = intval;
598 bs.bs_nexttbtt = nexttbtt;
599 bs.bs_dtimperiod = dtimperiod*intval;
600 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
601 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
602 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
603 bs.bs_cfpmaxduration = 0;
604
605 /*
606 * Calculate the number of consecutive beacons to miss* before taking
607 * a BMISS interrupt. The configuration is specified in TU so we only
608 * need calculate based on the beacon interval. Note that we clamp the
609 * result to at most 15 beacons.
610 */
611 if (sleepduration > intval) {
612 bs.bs_bmissthreshold = conf->listen_interval *
613 ATH_DEFAULT_BMISS_LIMIT / 2;
614 } else {
615 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
616 if (bs.bs_bmissthreshold > 15)
617 bs.bs_bmissthreshold = 15;
618 else if (bs.bs_bmissthreshold <= 0)
619 bs.bs_bmissthreshold = 1;
620 }
621
622 /*
623 * Calculate sleep duration. The configuration is given in ms.
624 * We ensure a multiple of the beacon period is used. Also, if the sleep
625 * duration is greater than the DTIM period then it makes senses
626 * to make it a multiple of that.
627 *
628 * XXX fixed at 100ms
629 */
630
631 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
632 if (bs.bs_sleepduration > bs.bs_dtimperiod)
633 bs.bs_sleepduration = bs.bs_dtimperiod;
634
635 /* TSF out of range threshold fixed at 1 second */
636 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
637
638 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
639 ath_dbg(common, BEACON,
640 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
641 bs.bs_bmissthreshold, bs.bs_sleepduration,
642 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
643
644 /* Set the computed STA beacon timers */
645
646 ath9k_hw_disable_interrupts(ah);
647 ath9k_hw_set_sta_beacon_timers(ah, &bs);
648 ah->imask |= ATH9K_INT_BMISS;
649
650 ath9k_hw_set_interrupts(ah);
651 ath9k_hw_enable_interrupts(ah);
652}
653
654static void ath_beacon_config_adhoc(struct ath_softc *sc,
655 struct ath_beacon_config *conf)
656{
657 struct ath_hw *ah = sc->sc_ah;
658 struct ath_common *common = ath9k_hw_common(ah);
659 u32 tsf, intval, nexttbtt;
660
661 ath9k_reset_beacon_status(sc);
662 if (!(sc->sc_flags & SC_OP_BEACONS))
663 ath9k_hw_settsf64(ah, sc->beacon.bc_tstamp);
664
665 intval = TU_TO_USEC(conf->beacon_interval);
666 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
667 nexttbtt = tsf + intval;
668
669 ath_dbg(common, BEACON, "IBSS nexttbtt %u intval %u (%u)\n",
670 nexttbtt, intval, conf->beacon_interval);
671
672 /*
673 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
674 * if we need to manually prepare beacon frames. Otherwise we use a
675 * self-linked tx descriptor and let the hardware deal with things.
676 */
677 ah->imask |= ATH9K_INT_SWBA;
678
679 ath_beaconq_config(sc);
680
681 /* Set the computed ADHOC beacon timers */
682
683 ath9k_hw_disable_interrupts(ah);
684 ath9k_beacon_init(sc, nexttbtt, intval);
685 sc->beacon.bmisscnt = 0;
686
687 ath9k_hw_set_interrupts(ah);
688 ath9k_hw_enable_interrupts(ah);
689}
690
691static bool ath9k_allow_beacon_config(struct ath_softc *sc,
692 struct ieee80211_vif *vif)
693{
694 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
695 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
696 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
697 struct ath_vif *avp = (void *)vif->drv_priv;
698
699 /*
700 * Can not have different beacon interval on multiple
701 * AP interface case
702 */
703 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
704 (sc->nbcnvifs > 1) &&
705 (vif->type == NL80211_IFTYPE_AP) &&
706 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
707 ath_dbg(common, CONFIG,
708 "Changing beacon interval of multiple AP interfaces !\n");
709 return false;
710 }
711 /*
712 * Can not configure station vif's beacon config
713 * while on AP opmode
714 */
715 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
716 (vif->type != NL80211_IFTYPE_AP)) {
717 ath_dbg(common, CONFIG,
718 "STA vif's beacon not allowed on AP mode\n");
719 return false;
720 }
721 /*
722 * Do not allow beacon config if HW was already configured
723 * with another STA vif
724 */
725 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
726 (vif->type == NL80211_IFTYPE_STATION) &&
727 (sc->sc_flags & SC_OP_BEACONS) &&
728 !avp->primary_sta_vif) {
729 ath_dbg(common, CONFIG,
730 "Beacon already configured for a station interface\n");
731 return false;
732 }
733 return true;
734}
735
736void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
737{
738 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
739 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
740
741 if (!ath9k_allow_beacon_config(sc, vif))
742 return;
743
744 /* Setup the beacon configuration parameters */
745 cur_conf->beacon_interval = bss_conf->beacon_int;
746 cur_conf->dtim_period = bss_conf->dtim_period;
747 cur_conf->listen_interval = 1;
748 cur_conf->dtim_count = 1;
749 cur_conf->bmiss_timeout =
750 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
751
752 /*
753 * It looks like mac80211 may end up using beacon interval of zero in
754 * some cases (at least for mesh point). Avoid getting into an
755 * infinite loop by using a bit safer value instead. To be safe,
756 * do sanity check on beacon interval for all operating modes.
757 */
758 if (cur_conf->beacon_interval == 0)
759 cur_conf->beacon_interval = 100;
760
761 /*
762 * We don't parse dtim period from mac80211 during the driver
763 * initialization as it breaks association with hidden-ssid
764 * AP and it causes latency in roaming
765 */
766 if (cur_conf->dtim_period == 0)
767 cur_conf->dtim_period = 1;
768
769 ath_set_beacon(sc);
770}
771
772static bool ath_has_valid_bslot(struct ath_softc *sc)
773{
774 struct ath_vif *avp;
775 int slot;
776 bool found = false;
777
778 for (slot = 0; slot < ATH_BCBUF; slot++) {
779 if (sc->beacon.bslot[slot]) {
780 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
781 if (avp->is_bslot_active) {
782 found = true;
783 break;
784 }
785 }
786 }
787 return found;
788}
789
790
791void ath_set_beacon(struct ath_softc *sc)
792{
793 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
794 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
795
796 switch (sc->sc_ah->opmode) {
797 case NL80211_IFTYPE_AP:
798 if (ath_has_valid_bslot(sc))
799 ath_beacon_config_ap(sc, cur_conf);
800 break;
801 case NL80211_IFTYPE_ADHOC:
802 case NL80211_IFTYPE_MESH_POINT:
803 ath_beacon_config_adhoc(sc, cur_conf);
804 break;
805 case NL80211_IFTYPE_STATION:
806 ath_beacon_config_sta(sc, cur_conf);
807 break;
808 default:
809 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
810 return;
811 }
812
813 sc->sc_flags |= SC_OP_BEACONS;
814}
815
816void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
817{
818 struct ath_hw *ah = sc->sc_ah;
819
820 if (!ath_has_valid_bslot(sc)) {
821 sc->sc_flags &= ~SC_OP_BEACONS;
822 return;
823 }
824
825 ath9k_ps_wakeup(sc);
826 if (status) {
827 /* Re-enable beaconing */
828 ah->imask |= ATH9K_INT_SWBA;
829 ath9k_hw_set_interrupts(ah);
830 } else {
831 /* Disable SWBA interrupt */
832 ah->imask &= ~ATH9K_INT_SWBA;
833 ath9k_hw_set_interrupts(ah);
834 tasklet_kill(&sc->bcon_tasklet);
835 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
836 }
837 ath9k_ps_restore(sc);
838}