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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
30
31
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
45 qi.tqi_aifs = 1;
46 qi.tqi_cwmin = 0;
47 qi.tqi_cwmax = 0;
48 } else {
49
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;
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
69
70
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);
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
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
169
170
171
172
173
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 sc->nbcnvifs++;
213
214 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
215 avp->av_bslot);
216}
217
218void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
219{
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;
224
225 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
226 avp->av_bslot);
227
228 tasklet_disable(&sc->bcon_tasklet);
229
230 cur_conf->enable_beacon &= ~BIT(avp->av_bslot);
231
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);
237 bf->bf_mpdu = NULL;
238 bf->bf_buf_addr = 0;
239 }
240
241 avp->av_bcbuf = NULL;
242 sc->beacon.bslot[avp->av_bslot] = NULL;
243 sc->nbcnvifs--;
244 list_add_tail(&bf->list, &sc->beacon.bbuf);
245
246 tasklet_enable(&sc->bcon_tasklet);
247}
248
249static int ath9k_beacon_choose_slot(struct ath_softc *sc)
250{
251 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
252 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
253 u16 intval;
254 u32 tsftu;
255 u64 tsf;
256 int slot;
257
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));
262 return 0;
263 }
264
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;
270
271 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
272 slot, tsf, tsftu / ATH_BCBUF);
273
274 return slot;
275}
276
277static void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
278{
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;
282 u32 tsfadjust;
283
284 if (avp->av_bslot == 0)
285 return;
286
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);
290
291 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
292 (unsigned long long)tsfadjust, avp->av_bslot);
293}
294
295bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif)
296{
297 if (!vif || !vif->csa_active)
298 return false;
299
300 if (!ieee80211_csa_is_complete(vif))
301 return false;
302
303 ieee80211_csa_finish(vif);
304 return true;
305}
306
307static void ath9k_csa_update_vif(void *data, u8 *mac, struct ieee80211_vif *vif)
308{
309 struct ath_softc *sc = data;
310 ath9k_csa_is_finished(sc, vif);
311}
312
313void ath9k_csa_update(struct ath_softc *sc)
314{
315 ieee80211_iterate_active_interfaces_atomic(sc->hw,
316 IEEE80211_IFACE_ITER_NORMAL,
317 ath9k_csa_update_vif, sc);
318}
319
320void ath9k_beacon_tasklet(unsigned long data)
321{
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);
328 int slot;
329
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");
333 return;
334 }
335
336
337
338
339
340
341
342
343 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
344 sc->beacon.bmisscnt++;
345
346 ath9k_hw_check_nav(ah);
347
348
349
350
351
352
353
354 if (!ath_hw_check(sc))
355 return;
356
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);
368 }
369
370 return;
371 }
372
373 slot = ath9k_beacon_choose_slot(sc);
374 vif = sc->beacon.bslot[slot];
375
376
377 if (!edma) {
378 if (ath9k_is_chanctx_enabled()) {
379 ath_chanctx_beacon_sent_ev(sc,
380 ATH_CHANCTX_EVENT_BEACON_SENT);
381 }
382
383 if (ath9k_csa_is_finished(sc, vif))
384 return;
385 }
386
387 if (!vif || !vif->bss_conf.enable_beacon)
388 return;
389
390 if (ath9k_is_chanctx_enabled()) {
391 ath_chanctx_event(sc, vif, ATH_CHANCTX_EVENT_BEACON_PREPARE);
392 }
393
394 bf = ath9k_beacon_generate(sc->hw, vif);
395
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;
400 }
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
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;
426 }
427
428 if (bf) {
429 ath9k_reset_beacon_status(sc);
430
431 ath_dbg(common, BEACON,
432 "Transmitting beacon for slot: %d\n", slot);
433
434
435 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
436
437 if (!edma)
438 ath9k_hw_txstart(ah, sc->beacon.beaconq);
439 }
440}
441
442
443
444
445static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
446 u32 intval, bool reset_tsf)
447{
448 struct ath_hw *ah = sc->sc_ah;
449
450 ath9k_hw_disable_interrupts(ah);
451 if (reset_tsf)
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);
458}
459
460
461
462
463
464
465static void ath9k_beacon_config_ap(struct ath_softc *sc,
466 struct ath_beacon_config *conf)
467{
468 struct ath_hw *ah = sc->sc_ah;
469
470 ath9k_cmn_beacon_config_ap(ah, conf, ATH_BCBUF);
471 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, false);
472}
473
474static void ath9k_beacon_config_sta(struct ath_hw *ah,
475 struct ath_beacon_config *conf)
476{
477 struct ath9k_beacon_state bs;
478
479 if (ath9k_cmn_beacon_config_sta(ah, conf, &bs) == -EPERM)
480 return;
481
482 ath9k_hw_disable_interrupts(ah);
483 ath9k_hw_set_sta_beacon_timers(ah, &bs);
484 ah->imask |= ATH9K_INT_BMISS;
485
486 ath9k_hw_set_interrupts(ah);
487 ath9k_hw_enable_interrupts(ah);
488}
489
490static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
491 struct ath_beacon_config *conf)
492{
493 struct ath_hw *ah = sc->sc_ah;
494 struct ath_common *common = ath9k_hw_common(ah);
495
496 ath9k_reset_beacon_status(sc);
497
498 ath9k_cmn_beacon_config_adhoc(ah, conf);
499
500 ath9k_beacon_init(sc, conf->nexttbtt, conf->intval, conf->ibss_creator);
501
502
503
504
505
506 if (!conf->ibss_creator && conf->enable_beacon)
507 set_bit(ATH_OP_BEACONS, &common->op_flags);
508}
509
510static bool ath9k_allow_beacon_config(struct ath_softc *sc,
511 struct ieee80211_vif *vif)
512{
513 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
514 struct ath_vif *avp = (void *)vif->drv_priv;
515
516 if (ath9k_is_chanctx_enabled()) {
517
518
519
520
521
522
523 if (sc->cur_chan != avp->chanctx)
524 return true;
525 }
526
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");
531 return false;
532 }
533 }
534
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");
541 return false;
542 }
543 }
544
545 return true;
546}
547
548static void ath9k_cache_beacon_config(struct ath_softc *sc,
549 struct ath_chanctx *ctx,
550 struct ieee80211_bss_conf *bss_conf)
551{
552 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
553 struct ath_beacon_config *cur_conf = &ctx->beacon;
554
555 ath_dbg(common, BEACON,
556 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
557
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;
562
563
564
565
566
567
568
569 if (cur_conf->beacon_interval == 0)
570 cur_conf->beacon_interval = 100;
571
572 cur_conf->bmiss_timeout =
573 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
574
575
576
577
578
579
580 if (cur_conf->dtim_period == 0)
581 cur_conf->dtim_period = 1;
582
583}
584
585void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
586 u32 changed)
587{
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;
594 unsigned long flags;
595 bool skip_beacon = false;
596
597 if (!ctx)
598 return;
599
600 cur_conf = &avp->chanctx->beacon;
601 if (vif->type == NL80211_IFTYPE_AP)
602 ath9k_set_tsfadjust(sc, vif);
603
604 if (!ath9k_allow_beacon_config(sc, vif))
605 return;
606
607 if (vif->type == NL80211_IFTYPE_STATION) {
608 ath9k_cache_beacon_config(sc, ctx, bss_conf);
609 if (ctx != sc->cur_chan)
610 return;
611
612 ath9k_set_beacon(sc);
613 set_bit(ATH_OP_BEACONS, &common->op_flags);
614 return;
615 }
616
617
618
619
620
621 if (changed & BSS_CHANGED_BEACON_ENABLED) {
622 bool enabled = cur_conf->enable_beacon;
623
624 if (!bss_conf->enable_beacon) {
625 cur_conf->enable_beacon &= ~BIT(avp->av_bslot);
626 } else {
627 cur_conf->enable_beacon |= BIT(avp->av_bslot);
628 if (!enabled)
629 ath9k_cache_beacon_config(sc, ctx, bss_conf);
630 }
631 }
632
633 if (ctx != sc->cur_chan)
634 return;
635
636
637
638
639
640 if (cur_conf->beacon_interval) {
641
642
643
644
645
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);
651 skip_beacon = true;
652 } else {
653 ath9k_set_beacon(sc);
654 }
655
656
657
658
659
660 if (cur_conf->enable_beacon && !skip_beacon)
661 set_bit(ATH_OP_BEACONS, &common->op_flags);
662 else
663 clear_bit(ATH_OP_BEACONS, &common->op_flags);
664 }
665}
666
667void ath9k_set_beacon(struct ath_softc *sc)
668{
669 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
670 struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
671
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);
676 break;
677 case NL80211_IFTYPE_ADHOC:
678 ath9k_beacon_config_adhoc(sc, cur_conf);
679 break;
680 case NL80211_IFTYPE_STATION:
681 ath9k_beacon_config_sta(sc->sc_ah, cur_conf);
682 break;
683 default:
684 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
685 return;
686 }
687}
688