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, q: sc->beacon.beaconq, qinfo: &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, q: txq->axq_qnum, qinfo: &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, q: sc->beacon.beaconq, qinfo: &qi)) {
61 ath_err(common, "Unable to update h/w beacon queue parameters\n");
62 } else {
63 ath9k_hw_resettxqueue(ah, q: 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, ds: bf->bf_desc, i: &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(ah: 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, link_id: 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(lock: &cabq->axq_lock);
176 cabq_depth = cabq->axq_depth;
177 spin_unlock_bh(lock: &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, txq: cabq);
184 }
185 }
186
187 ath9k_beacon_setup(sc, vif, bf, rateidx: 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(ah: 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(entry: &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(ah: 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(t: &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(new: &bf->list, head: &sc->beacon.bbuf);
240
241 tasklet_enable(t: &sc->bcon_tasklet);
242}
243
244void ath9k_beacon_ensure_primary_slot(struct ath_softc *sc)
245{
246 struct ath_common *common = ath9k_hw_common(ah: 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(t: &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(last: &avp->chanctx->tsf_ts, NULL);
297 ath9k_hw_settsf64(ah: sc->sc_ah, tsf64: 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(t: &sc->bcon_tasklet);
304}
305
306static int ath9k_beacon_choose_slot(struct ath_softc *sc)
307{
308 struct ath_common *common = ath9k_hw_common(ah: 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(ah: 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(ah: 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, link_id: 0))
369 return false;
370
371 ieee80211_csa_finish(vif, link_id: 0);
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(hw: sc->hw,
384 iter_flags: IEEE80211_IFACE_ITER_NORMAL,
385 iterator: ath9k_csa_update_vif, data: 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, q: 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, q: 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, type: 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 ev: 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, ev: ATH_CHANCTX_EVENT_BEACON_PREPARE);
460 }
461
462 bf = ath9k_beacon_generate(hw: 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, q: sc->beacon.beaconq, txdp: bf->bf_daddr);
504
505 if (!edma)
506 ath9k_hw_txstart(ah, q: 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, next_beacon: nexttbtt, beacon_period: 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(ah: sc->sc_ah);
530 sc->sc_ah->imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);
531 sc->beacon.bmisscnt = 0;
532 ath9k_hw_set_interrupts(ah: sc->sc_ah);
533 ath9k_hw_enable_interrupts(ah: 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, nexttbtt: conf->nexttbtt, intval: 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: &bs) == -EPERM)
556 return;
557
558 ath9k_hw_disable_interrupts(ah);
559 ath9k_hw_set_sta_beacon_timers(ah, bs: &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, nexttbtt: conf->nexttbtt, intval: 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(nr: ATH_OP_BEACONS, addr: &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(ah: 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(nr: ATH_OP_BEACONS, addr: &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, vif: main_vif);
654
655 ath9k_set_beacon(sc);
656 set_bit(nr: ATH_OP_BEACONS, addr: &common->op_flags);
657 return;
658 }
659
660 /* Update the beacon configuration. */
661 ath9k_cache_beacon_config(sc, ctx, vif: 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(lock: &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(nr: ATH_OP_BEACONS, addr: &common->op_flags);
687 ath9k_set_beacon(sc);
688 } else {
689 clear_bit(nr: ATH_OP_BEACONS, addr: &common->op_flags);
690 ath9k_beacon_stop(sc);
691 }
692 } else {
693 clear_bit(nr: ATH_OP_BEACONS, addr: &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(ah: 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, conf: cur_conf);
707 break;
708 case NL80211_IFTYPE_ADHOC:
709 ath9k_beacon_config_adhoc(sc, conf: cur_conf);
710 break;
711 case NL80211_IFTYPE_STATION:
712 ath9k_beacon_config_sta(ah: sc->sc_ah, conf: cur_conf);
713 break;
714 default:
715 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
716 return;
717 }
718}
719

source code of linux/drivers/net/wireless/ath/ath9k/beacon.c