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
ath9k_reset_beacon_status(struct ath_softc * sc)22 static 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 */
ath9k_beaconq_config(struct ath_softc * sc)33 static 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 /* Always burst out beacon and CAB traffic. */
44 qi.tqi_aifs = 1;
45 qi.tqi_cwmin = 0;
46 qi.tqi_cwmax = 0;
47 } else {
48 /* Adhoc mode; important thing is to use 2x cwmin. */
49 txq = sc->tx.txq_map[IEEE80211_AC_BE];
50 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
51 qi.tqi_aifs = qi_be.tqi_aifs;
52 if (ah->slottime == ATH9K_SLOT_TIME_20)
53 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
54 else
55 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
56 qi.tqi_cwmax = qi_be.tqi_cwmax;
57 }
58
59 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
60 ath_err(common, "Unable to update h/w beacon queue parameters\n");
61 } else {
62 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
63 }
64 }
65
66 /*
67 * Associates the beacon frame buffer with a transmit descriptor. Will set
68 * up rate codes, and channel flags. Beacons are always sent out at the
69 * lowest rate, and are not retried.
70 */
ath9k_beacon_setup(struct ath_softc * sc,struct ieee80211_vif * vif,struct ath_buf * bf,int rateidx)71 static void ath9k_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
72 struct ath_buf *bf, int rateidx)
73 {
74 struct sk_buff *skb = bf->bf_mpdu;
75 struct ath_hw *ah = sc->sc_ah;
76 struct ath_common *common = ath9k_hw_common(ah);
77 struct ath_tx_info info;
78 struct ieee80211_supported_band *sband;
79 u8 chainmask = ah->txchainmask;
80 u8 rate = 0;
81
82 sband = &sc->sbands[common->hw->conf.chandef.chan->band];
83 rate = sband->bitrates[rateidx].hw_value;
84 if (vif->bss_conf.use_short_preamble)
85 rate |= sband->bitrates[rateidx].hw_value_short;
86
87 memset(&info, 0, sizeof(info));
88 info.pkt_len = skb->len + FCS_LEN;
89 info.type = ATH9K_PKT_TYPE_BEACON;
90 info.txpower = MAX_RATE_POWER;
91 info.keyix = ATH9K_TXKEYIX_INVALID;
92 info.keytype = ATH9K_KEY_TYPE_CLEAR;
93 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
94
95 info.buf_addr[0] = bf->bf_buf_addr;
96 info.buf_len[0] = roundup(skb->len, 4);
97
98 info.is_first = true;
99 info.is_last = true;
100
101 info.qcu = sc->beacon.beaconq;
102
103 info.rates[0].Tries = 1;
104 info.rates[0].Rate = rate;
105 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
106
107 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
108 }
109
ath9k_tx_cabq(struct ieee80211_hw * hw,struct sk_buff * skb)110 static void ath9k_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
111 {
112 struct ath_softc *sc = hw->priv;
113 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
114 struct ath_tx_control txctl;
115
116 memset(&txctl, 0, sizeof(struct ath_tx_control));
117 txctl.txq = sc->beacon.cabq;
118
119 ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb);
120
121 if (ath_tx_start(hw, skb, &txctl) != 0) {
122 ath_dbg(common, XMIT, "CABQ TX failed\n");
123 ieee80211_free_txskb(hw, skb);
124 }
125 }
126
ath9k_beacon_generate(struct ieee80211_hw * hw,struct ieee80211_vif * vif)127 static struct ath_buf *ath9k_beacon_generate(struct ieee80211_hw *hw,
128 struct ieee80211_vif *vif)
129 {
130 struct ath_softc *sc = hw->priv;
131 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
132 struct ath_buf *bf;
133 struct ath_vif *avp = (void *)vif->drv_priv;
134 struct sk_buff *skb;
135 struct ath_txq *cabq = sc->beacon.cabq;
136 struct ieee80211_tx_info *info;
137 struct ieee80211_mgmt *mgmt_hdr;
138 int cabq_depth;
139
140 if (avp->av_bcbuf == NULL)
141 return NULL;
142
143 bf = avp->av_bcbuf;
144 skb = bf->bf_mpdu;
145 if (skb) {
146 dma_unmap_single(sc->dev, bf->bf_buf_addr,
147 skb->len, DMA_TO_DEVICE);
148 dev_kfree_skb_any(skb);
149 bf->bf_buf_addr = 0;
150 bf->bf_mpdu = NULL;
151 }
152
153 skb = ieee80211_beacon_get(hw, vif);
154 if (skb == NULL)
155 return NULL;
156
157 bf->bf_mpdu = skb;
158
159 mgmt_hdr = (struct ieee80211_mgmt *)skb->data;
160 mgmt_hdr->u.beacon.timestamp = avp->tsf_adjust;
161
162 info = IEEE80211_SKB_CB(skb);
163 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
164 /*
165 * TODO: make sure the seq# gets assigned properly (vs. other
166 * TX frames)
167 */
168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
169 sc->tx.seq_no += 0x10;
170 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
171 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
172 }
173
174 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
175 skb->len, DMA_TO_DEVICE);
176 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
177 dev_kfree_skb_any(skb);
178 bf->bf_mpdu = NULL;
179 bf->bf_buf_addr = 0;
180 ath_err(common, "dma_mapping_error on beaconing\n");
181 return NULL;
182 }
183
184 skb = ieee80211_get_buffered_bc(hw, vif);
185
186 /*
187 * if the CABQ traffic from previous DTIM is pending and the current
188 * beacon is also a DTIM.
189 * 1) if there is only one vif let the cab traffic continue.
190 * 2) if there are more than one vif and we are using staggered
191 * beacons, then drain the cabq by dropping all the frames in
192 * the cabq so that the current vifs cab traffic can be scheduled.
193 */
194 spin_lock_bh(&cabq->axq_lock);
195 cabq_depth = cabq->axq_depth;
196 spin_unlock_bh(&cabq->axq_lock);
197
198 if (skb && cabq_depth) {
199 if (sc->nvifs > 1) {
200 ath_dbg(common, BEACON,
201 "Flushing previous cabq traffic\n");
202 ath_draintxq(sc, cabq);
203 }
204 }
205
206 ath9k_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
207
208 while (skb) {
209 ath9k_tx_cabq(hw, skb);
210 skb = ieee80211_get_buffered_bc(hw, vif);
211 }
212
213 return bf;
214 }
215
ath9k_beacon_assign_slot(struct ath_softc * sc,struct ieee80211_vif * vif)216 void ath9k_beacon_assign_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
217 {
218 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
219 struct ath_vif *avp = (void *)vif->drv_priv;
220 int slot;
221
222 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf, struct ath_buf, list);
223 list_del(&avp->av_bcbuf->list);
224
225 for (slot = 0; slot < ATH_BCBUF; slot++) {
226 if (sc->beacon.bslot[slot] == NULL) {
227 avp->av_bslot = slot;
228 break;
229 }
230 }
231
232 sc->beacon.bslot[avp->av_bslot] = vif;
233 sc->nbcnvifs++;
234
235 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
236 avp->av_bslot);
237 }
238
ath9k_beacon_remove_slot(struct ath_softc * sc,struct ieee80211_vif * vif)239 void ath9k_beacon_remove_slot(struct ath_softc *sc, struct ieee80211_vif *vif)
240 {
241 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
242 struct ath_vif *avp = (void *)vif->drv_priv;
243 struct ath_buf *bf = avp->av_bcbuf;
244
245 ath_dbg(common, CONFIG, "Removing interface at beacon slot: %d\n",
246 avp->av_bslot);
247
248 tasklet_disable(&sc->bcon_tasklet);
249
250 if (bf && bf->bf_mpdu) {
251 struct sk_buff *skb = bf->bf_mpdu;
252 dma_unmap_single(sc->dev, bf->bf_buf_addr,
253 skb->len, DMA_TO_DEVICE);
254 dev_kfree_skb_any(skb);
255 bf->bf_mpdu = NULL;
256 bf->bf_buf_addr = 0;
257 }
258
259 avp->av_bcbuf = NULL;
260 sc->beacon.bslot[avp->av_bslot] = NULL;
261 sc->nbcnvifs--;
262 list_add_tail(&bf->list, &sc->beacon.bbuf);
263
264 tasklet_enable(&sc->bcon_tasklet);
265 }
266
ath9k_beacon_choose_slot(struct ath_softc * sc)267 static int ath9k_beacon_choose_slot(struct ath_softc *sc)
268 {
269 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
270 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
271 u16 intval;
272 u32 tsftu;
273 u64 tsf;
274 int slot;
275
276 if (sc->sc_ah->opmode != NL80211_IFTYPE_AP) {
277 ath_dbg(common, BEACON, "slot 0, tsf: %llu\n",
278 ath9k_hw_gettsf64(sc->sc_ah));
279 return 0;
280 }
281
282 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
283 tsf = ath9k_hw_gettsf64(sc->sc_ah);
284 tsf += TU_TO_USEC(sc->sc_ah->config.sw_beacon_response_time);
285 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
286 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
287
288 ath_dbg(common, BEACON, "slot: %d tsf: %llu tsftu: %u\n",
289 slot, tsf, tsftu / ATH_BCBUF);
290
291 return slot;
292 }
293
ath9k_set_tsfadjust(struct ath_softc * sc,struct ieee80211_vif * vif)294 void ath9k_set_tsfadjust(struct ath_softc *sc, struct ieee80211_vif *vif)
295 {
296 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
297 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
298 struct ath_vif *avp = (void *)vif->drv_priv;
299 u64 tsfadjust;
300
301 if (avp->av_bslot == 0)
302 return;
303
304 tsfadjust = cur_conf->beacon_interval * avp->av_bslot / ATH_BCBUF;
305 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
306
307 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
308 (unsigned long long)tsfadjust, avp->av_bslot);
309 }
310
ath9k_beacon_tasklet(unsigned long data)311 void ath9k_beacon_tasklet(unsigned long data)
312 {
313 struct ath_softc *sc = (struct ath_softc *)data;
314 struct ath_hw *ah = sc->sc_ah;
315 struct ath_common *common = ath9k_hw_common(ah);
316 struct ath_buf *bf = NULL;
317 struct ieee80211_vif *vif;
318 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
319 int slot;
320
321 if (test_bit(SC_OP_HW_RESET, &sc->sc_flags)) {
322 ath_dbg(common, RESET,
323 "reset work is pending, skip beaconing now\n");
324 return;
325 }
326
327 /*
328 * Check if the previous beacon has gone out. If
329 * not don't try to post another, skip this period
330 * and wait for the next. Missed beacons indicate
331 * a problem and should not occur. If we miss too
332 * many consecutive beacons reset the device.
333 */
334 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
335 sc->beacon.bmisscnt++;
336
337 if (!ath9k_hw_check_alive(ah))
338 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
339
340 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
341 ath_dbg(common, BSTUCK,
342 "missed %u consecutive beacons\n",
343 sc->beacon.bmisscnt);
344 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
345 if (sc->beacon.bmisscnt > 3)
346 ath9k_hw_bstuck_nfcal(ah);
347 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
348 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
349 sc->beacon.bmisscnt = 0;
350 ath9k_queue_reset(sc, RESET_TYPE_BEACON_STUCK);
351 }
352
353 return;
354 }
355
356 slot = ath9k_beacon_choose_slot(sc);
357 vif = sc->beacon.bslot[slot];
358
359 if (!vif || !vif->bss_conf.enable_beacon)
360 return;
361
362 bf = ath9k_beacon_generate(sc->hw, vif);
363
364 if (sc->beacon.bmisscnt != 0) {
365 ath_dbg(common, BSTUCK, "resume beacon xmit after %u misses\n",
366 sc->beacon.bmisscnt);
367 sc->beacon.bmisscnt = 0;
368 }
369
370 /*
371 * Handle slot time change when a non-ERP station joins/leaves
372 * an 11g network. The 802.11 layer notifies us via callback,
373 * we mark updateslot, then wait one beacon before effecting
374 * the change. This gives associated stations at least one
375 * beacon interval to note the state change.
376 *
377 * NB: The slot time change state machine is clocked according
378 * to whether we are bursting or staggering beacons. We
379 * recognize the request to update and record the current
380 * slot then don't transition until that slot is reached
381 * again. If we miss a beacon for that slot then we'll be
382 * slow to transition but we'll be sure at least one beacon
383 * interval has passed. When bursting slot is always left
384 * set to ATH_BCBUF so this check is a noop.
385 */
386 if (sc->beacon.updateslot == UPDATE) {
387 sc->beacon.updateslot = COMMIT;
388 sc->beacon.slotupdate = slot;
389 } else if (sc->beacon.updateslot == COMMIT &&
390 sc->beacon.slotupdate == slot) {
391 ah->slottime = sc->beacon.slottime;
392 ath9k_hw_init_global_settings(ah);
393 sc->beacon.updateslot = OK;
394 }
395
396 if (bf) {
397 ath9k_reset_beacon_status(sc);
398
399 ath_dbg(common, BEACON,
400 "Transmitting beacon for slot: %d\n", slot);
401
402 /* NB: cabq traffic should already be queued and primed */
403 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
404
405 if (!edma)
406 ath9k_hw_txstart(ah, sc->beacon.beaconq);
407 }
408 }
409
410 /*
411 * Both nexttbtt and intval have to be in usecs.
412 */
ath9k_beacon_init(struct ath_softc * sc,u32 nexttbtt,u32 intval,bool reset_tsf)413 static void ath9k_beacon_init(struct ath_softc *sc, u32 nexttbtt,
414 u32 intval, bool reset_tsf)
415 {
416 struct ath_hw *ah = sc->sc_ah;
417
418 ath9k_hw_disable_interrupts(ah);
419 if (reset_tsf)
420 ath9k_hw_reset_tsf(ah);
421 ath9k_beaconq_config(sc);
422 ath9k_hw_beaconinit(ah, nexttbtt, intval);
423 sc->beacon.bmisscnt = 0;
424 ath9k_hw_set_interrupts(ah);
425 ath9k_hw_enable_interrupts(ah);
426 }
427
428 /*
429 * For multi-bss ap support beacons are either staggered evenly over N slots or
430 * burst together. For the former arrange for the SWBA to be delivered for each
431 * slot. Slots that are not occupied will generate nothing.
432 */
ath9k_beacon_config_ap(struct ath_softc * sc,struct ath_beacon_config * conf)433 static void ath9k_beacon_config_ap(struct ath_softc *sc,
434 struct ath_beacon_config *conf)
435 {
436 struct ath_hw *ah = sc->sc_ah;
437 struct ath_common *common = ath9k_hw_common(ah);
438 u32 nexttbtt, intval;
439
440 /* NB: the beacon interval is kept internally in TU's */
441 intval = TU_TO_USEC(conf->beacon_interval);
442 intval /= ATH_BCBUF;
443 nexttbtt = intval;
444
445 if (conf->enable_beacon)
446 ah->imask |= ATH9K_INT_SWBA;
447 else
448 ah->imask &= ~ATH9K_INT_SWBA;
449
450 ath_dbg(common, BEACON,
451 "AP (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
452 (conf->enable_beacon) ? "Enable" : "Disable",
453 nexttbtt, intval, conf->beacon_interval);
454
455 ath9k_beacon_init(sc, nexttbtt, intval, true);
456 }
457
458 /*
459 * This sets up the beacon timers according to the timestamp of the last
460 * received beacon and the current TSF, configures PCF and DTIM
461 * handling, programs the sleep registers so the hardware will wakeup in
462 * time to receive beacons, and configures the beacon miss handling so
463 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
464 * we've associated with.
465 */
ath9k_beacon_config_sta(struct ath_softc * sc,struct ath_beacon_config * conf)466 static void ath9k_beacon_config_sta(struct ath_softc *sc,
467 struct ath_beacon_config *conf)
468 {
469 struct ath_hw *ah = sc->sc_ah;
470 struct ath_common *common = ath9k_hw_common(ah);
471 struct ath9k_beacon_state bs;
472 int dtimperiod, dtimcount, sleepduration;
473 int cfpperiod, cfpcount;
474 u32 nexttbtt = 0, intval, tsftu;
475 u64 tsf;
476 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
477
478 /* No need to configure beacon if we are not associated */
479 if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags)) {
480 ath_dbg(common, BEACON,
481 "STA is not yet associated..skipping beacon config\n");
482 return;
483 }
484
485 memset(&bs, 0, sizeof(bs));
486 intval = conf->beacon_interval;
487
488 /*
489 * Setup dtim and cfp parameters according to
490 * last beacon we received (which may be none).
491 */
492 dtimperiod = conf->dtim_period;
493 dtimcount = conf->dtim_count;
494 if (dtimcount >= dtimperiod) /* NB: sanity check */
495 dtimcount = 0;
496 cfpperiod = 1; /* NB: no PCF support yet */
497 cfpcount = 0;
498
499 sleepduration = conf->listen_interval * intval;
500
501 /*
502 * Pull nexttbtt forward to reflect the current
503 * TSF and calculate dtim+cfp state for the result.
504 */
505 tsf = ath9k_hw_gettsf64(ah);
506 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
507
508 num_beacons = tsftu / intval + 1;
509 offset = tsftu % intval;
510 nexttbtt = tsftu - offset;
511 if (offset)
512 nexttbtt += intval;
513
514 /* DTIM Beacon every dtimperiod Beacon */
515 dtim_dec_count = num_beacons % dtimperiod;
516 /* CFP every cfpperiod DTIM Beacon */
517 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
518 if (dtim_dec_count)
519 cfp_dec_count++;
520
521 dtimcount -= dtim_dec_count;
522 if (dtimcount < 0)
523 dtimcount += dtimperiod;
524
525 cfpcount -= cfp_dec_count;
526 if (cfpcount < 0)
527 cfpcount += cfpperiod;
528
529 bs.bs_intval = intval;
530 bs.bs_nexttbtt = nexttbtt;
531 bs.bs_dtimperiod = dtimperiod*intval;
532 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
533 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
534 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
535 bs.bs_cfpmaxduration = 0;
536
537 /*
538 * Calculate the number of consecutive beacons to miss* before taking
539 * a BMISS interrupt. The configuration is specified in TU so we only
540 * need calculate based on the beacon interval. Note that we clamp the
541 * result to at most 15 beacons.
542 */
543 if (sleepduration > intval) {
544 bs.bs_bmissthreshold = conf->listen_interval *
545 ATH_DEFAULT_BMISS_LIMIT / 2;
546 } else {
547 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
548 if (bs.bs_bmissthreshold > 15)
549 bs.bs_bmissthreshold = 15;
550 else if (bs.bs_bmissthreshold <= 0)
551 bs.bs_bmissthreshold = 1;
552 }
553
554 /*
555 * Calculate sleep duration. The configuration is given in ms.
556 * We ensure a multiple of the beacon period is used. Also, if the sleep
557 * duration is greater than the DTIM period then it makes senses
558 * to make it a multiple of that.
559 *
560 * XXX fixed at 100ms
561 */
562
563 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
564 if (bs.bs_sleepduration > bs.bs_dtimperiod)
565 bs.bs_sleepduration = bs.bs_dtimperiod;
566
567 /* TSF out of range threshold fixed at 1 second */
568 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
569
570 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
571 ath_dbg(common, BEACON,
572 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
573 bs.bs_bmissthreshold, bs.bs_sleepduration,
574 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
575
576 /* Set the computed STA beacon timers */
577
578 ath9k_hw_disable_interrupts(ah);
579 ath9k_hw_set_sta_beacon_timers(ah, &bs);
580 ah->imask |= ATH9K_INT_BMISS;
581
582 ath9k_hw_set_interrupts(ah);
583 ath9k_hw_enable_interrupts(ah);
584 }
585
ath9k_beacon_config_adhoc(struct ath_softc * sc,struct ath_beacon_config * conf)586 static void ath9k_beacon_config_adhoc(struct ath_softc *sc,
587 struct ath_beacon_config *conf)
588 {
589 struct ath_hw *ah = sc->sc_ah;
590 struct ath_common *common = ath9k_hw_common(ah);
591 u32 intval, nexttbtt;
592
593 ath9k_reset_beacon_status(sc);
594
595 intval = TU_TO_USEC(conf->beacon_interval);
596
597 if (conf->ibss_creator) {
598 nexttbtt = intval;
599 } else {
600 u32 tbtt, offset, tsftu;
601 u64 tsf;
602
603 /*
604 * Pull nexttbtt forward to reflect the current
605 * sync'd TSF.
606 */
607 tsf = ath9k_hw_gettsf64(ah);
608 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
609 offset = tsftu % conf->beacon_interval;
610 tbtt = tsftu - offset;
611 if (offset)
612 tbtt += conf->beacon_interval;
613
614 nexttbtt = TU_TO_USEC(tbtt);
615 }
616
617 if (conf->enable_beacon)
618 ah->imask |= ATH9K_INT_SWBA;
619 else
620 ah->imask &= ~ATH9K_INT_SWBA;
621
622 ath_dbg(common, BEACON,
623 "IBSS (%s) nexttbtt: %u intval: %u conf_intval: %u\n",
624 (conf->enable_beacon) ? "Enable" : "Disable",
625 nexttbtt, intval, conf->beacon_interval);
626
627 ath9k_beacon_init(sc, nexttbtt, intval, conf->ibss_creator);
628
629 /*
630 * Set the global 'beacon has been configured' flag for the
631 * joiner case in IBSS mode.
632 */
633 if (!conf->ibss_creator && conf->enable_beacon)
634 set_bit(SC_OP_BEACONS, &sc->sc_flags);
635 }
636
ath9k_allow_beacon_config(struct ath_softc * sc,struct ieee80211_vif * vif)637 bool ath9k_allow_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
638 {
639 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
640 struct ath_vif *avp = (void *)vif->drv_priv;
641
642 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
643 if ((vif->type != NL80211_IFTYPE_AP) ||
644 (sc->nbcnvifs > 1)) {
645 ath_dbg(common, CONFIG,
646 "An AP interface is already present !\n");
647 return false;
648 }
649 }
650
651 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
652 if ((vif->type == NL80211_IFTYPE_STATION) &&
653 test_bit(SC_OP_BEACONS, &sc->sc_flags) &&
654 !avp->primary_sta_vif) {
655 ath_dbg(common, CONFIG,
656 "Beacon already configured for a station interface\n");
657 return false;
658 }
659 }
660
661 return true;
662 }
663
ath9k_cache_beacon_config(struct ath_softc * sc,struct ieee80211_bss_conf * bss_conf)664 static void ath9k_cache_beacon_config(struct ath_softc *sc,
665 struct ieee80211_bss_conf *bss_conf)
666 {
667 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
668 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
669
670 ath_dbg(common, BEACON,
671 "Caching beacon data for BSS: %pM\n", bss_conf->bssid);
672
673 cur_conf->beacon_interval = bss_conf->beacon_int;
674 cur_conf->dtim_period = bss_conf->dtim_period;
675 cur_conf->listen_interval = 1;
676 cur_conf->dtim_count = 1;
677 cur_conf->ibss_creator = bss_conf->ibss_creator;
678 cur_conf->bmiss_timeout =
679 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
680
681 /*
682 * It looks like mac80211 may end up using beacon interval of zero in
683 * some cases (at least for mesh point). Avoid getting into an
684 * infinite loop by using a bit safer value instead. To be safe,
685 * do sanity check on beacon interval for all operating modes.
686 */
687 if (cur_conf->beacon_interval == 0)
688 cur_conf->beacon_interval = 100;
689
690 /*
691 * We don't parse dtim period from mac80211 during the driver
692 * initialization as it breaks association with hidden-ssid
693 * AP and it causes latency in roaming
694 */
695 if (cur_conf->dtim_period == 0)
696 cur_conf->dtim_period = 1;
697
698 }
699
ath9k_beacon_config(struct ath_softc * sc,struct ieee80211_vif * vif,u32 changed)700 void ath9k_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif,
701 u32 changed)
702 {
703 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
704 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
705 unsigned long flags;
706 bool skip_beacon = false;
707
708 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION) {
709 ath9k_cache_beacon_config(sc, bss_conf);
710 ath9k_set_beacon(sc);
711 set_bit(SC_OP_BEACONS, &sc->sc_flags);
712 return;
713
714 }
715
716 /*
717 * Take care of multiple interfaces when
718 * enabling/disabling SWBA.
719 */
720 if (changed & BSS_CHANGED_BEACON_ENABLED) {
721 if (!bss_conf->enable_beacon &&
722 (sc->nbcnvifs <= 1)) {
723 cur_conf->enable_beacon = false;
724 } else if (bss_conf->enable_beacon) {
725 cur_conf->enable_beacon = true;
726 ath9k_cache_beacon_config(sc, bss_conf);
727 }
728 }
729
730 /*
731 * Configure the HW beacon registers only when we have a valid
732 * beacon interval.
733 */
734 if (cur_conf->beacon_interval) {
735 /*
736 * If we are joining an existing IBSS network, start beaconing
737 * only after a TSF-sync has taken place. Ensure that this
738 * happens by setting the appropriate flags.
739 */
740 if ((changed & BSS_CHANGED_IBSS) && !bss_conf->ibss_creator &&
741 bss_conf->enable_beacon) {
742 spin_lock_irqsave(&sc->sc_pm_lock, flags);
743 sc->ps_flags |= PS_BEACON_SYNC | PS_WAIT_FOR_BEACON;
744 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
745 skip_beacon = true;
746 } else {
747 ath9k_set_beacon(sc);
748 }
749
750 /*
751 * Do not set the SC_OP_BEACONS flag for IBSS joiner mode
752 * here, it is done in ath9k_beacon_config_adhoc().
753 */
754 if (cur_conf->enable_beacon && !skip_beacon)
755 set_bit(SC_OP_BEACONS, &sc->sc_flags);
756 else
757 clear_bit(SC_OP_BEACONS, &sc->sc_flags);
758 }
759 }
760
ath9k_set_beacon(struct ath_softc * sc)761 void ath9k_set_beacon(struct ath_softc *sc)
762 {
763 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
764 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
765
766 switch (sc->sc_ah->opmode) {
767 case NL80211_IFTYPE_AP:
768 ath9k_beacon_config_ap(sc, cur_conf);
769 break;
770 case NL80211_IFTYPE_ADHOC:
771 case NL80211_IFTYPE_MESH_POINT:
772 ath9k_beacon_config_adhoc(sc, cur_conf);
773 break;
774 case NL80211_IFTYPE_STATION:
775 ath9k_beacon_config_sta(sc, cur_conf);
776 break;
777 default:
778 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
779 return;
780 }
781 }
782