1 /*
2 * Copyright (c) 2008-2009 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 "ath9k.h"
18
19 #define FUDGE 2
20
21 /*
22 * This function will modify certain transmit queue properties depending on
23 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
24 * settings and channel width min/max
25 */
ath_beaconq_config(struct ath_softc * sc)26 int ath_beaconq_config(struct ath_softc *sc)
27 {
28 struct ath_hw *ah = sc->sc_ah;
29 struct ath_common *common = ath9k_hw_common(ah);
30 struct ath9k_tx_queue_info qi, qi_be;
31 struct ath_txq *txq;
32
33 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
34 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
35 /* Always burst out beacon and CAB traffic. */
36 qi.tqi_aifs = 1;
37 qi.tqi_cwmin = 0;
38 qi.tqi_cwmax = 0;
39 } else {
40 /* Adhoc mode; important thing is to use 2x cwmin. */
41 txq = sc->tx.txq_map[WME_AC_BE];
42 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
43 qi.tqi_aifs = qi_be.tqi_aifs;
44 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
45 qi.tqi_cwmax = qi_be.tqi_cwmax;
46 }
47
48 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
49 ath_err(common,
50 "Unable to update h/w beacon queue parameters\n");
51 return 0;
52 } else {
53 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
54 return 1;
55 }
56 }
57
58 /*
59 * Associates the beacon frame buffer with a transmit descriptor. Will set
60 * up all required antenna switch parameters, rate codes, and channel flags.
61 * Beacons are always sent out at the lowest rate, and are not retried.
62 */
ath_beacon_setup(struct ath_softc * sc,struct ath_vif * avp,struct ath_buf * bf,int rateidx)63 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
64 struct ath_buf *bf, int rateidx)
65 {
66 struct sk_buff *skb = bf->bf_mpdu;
67 struct ath_hw *ah = sc->sc_ah;
68 struct ath_common *common = ath9k_hw_common(ah);
69 struct ath_desc *ds;
70 struct ath9k_11n_rate_series series[4];
71 int flags, antenna, ctsrate = 0, ctsduration = 0;
72 struct ieee80211_supported_band *sband;
73 u8 rate = 0;
74
75 ds = bf->bf_desc;
76 flags = ATH9K_TXDESC_NOACK;
77
78 ds->ds_link = 0;
79 /*
80 * Switch antenna every beacon.
81 * Should only switch every beacon period, not for every SWBA
82 * XXX assumes two antennae
83 */
84 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
85
86 sband = &sc->sbands[common->hw->conf.channel->band];
87 rate = sband->bitrates[rateidx].hw_value;
88 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
89 rate |= sband->bitrates[rateidx].hw_value_short;
90
91 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
92 ATH9K_PKT_TYPE_BEACON,
93 MAX_RATE_POWER,
94 ATH9K_TXKEYIX_INVALID,
95 ATH9K_KEY_TYPE_CLEAR,
96 flags);
97
98 /* NB: beacon's BufLen must be a multiple of 4 bytes */
99 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
100 true, true, ds, bf->bf_buf_addr,
101 sc->beacon.beaconq);
102
103 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
104 series[0].Tries = 1;
105 series[0].Rate = rate;
106 series[0].ChSel = ath_txchainmask_reduction(sc,
107 common->tx_chainmask, series[0].Rate);
108 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
109 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
110 series, 4, 0);
111 }
112
ath_tx_cabq(struct ieee80211_hw * hw,struct sk_buff * skb)113 static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
114 {
115 struct ath_softc *sc = hw->priv;
116 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
117 struct ath_tx_control txctl;
118
119 memset(&txctl, 0, sizeof(struct ath_tx_control));
120 txctl.txq = sc->beacon.cabq;
121
122 ath_dbg(common, ATH_DBG_XMIT,
123 "transmitting CABQ packet, skb: %p\n", skb);
124
125 if (ath_tx_start(hw, skb, &txctl) != 0) {
126 ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
127 dev_kfree_skb_any(skb);
128 }
129 }
130
ath_beacon_generate(struct ieee80211_hw * hw,struct ieee80211_vif * vif)131 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
132 struct ieee80211_vif *vif)
133 {
134 struct ath_softc *sc = hw->priv;
135 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
136 struct ath_buf *bf;
137 struct ath_vif *avp;
138 struct sk_buff *skb;
139 struct ath_txq *cabq;
140 struct ieee80211_tx_info *info;
141 int cabq_depth;
142
143 avp = (void *)vif->drv_priv;
144 cabq = sc->beacon.cabq;
145
146 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
147 return NULL;
148
149 /* Release the old beacon first */
150
151 bf = avp->av_bcbuf;
152 skb = bf->bf_mpdu;
153 if (skb) {
154 dma_unmap_single(sc->dev, bf->bf_buf_addr,
155 skb->len, DMA_TO_DEVICE);
156 dev_kfree_skb_any(skb);
157 bf->bf_buf_addr = 0;
158 }
159
160 /* Get a new beacon from mac80211 */
161
162 skb = ieee80211_beacon_get(hw, vif);
163 bf->bf_mpdu = skb;
164 if (skb == NULL)
165 return NULL;
166 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
167 avp->tsf_adjust;
168
169 info = IEEE80211_SKB_CB(skb);
170 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
171 /*
172 * TODO: make sure the seq# gets assigned properly (vs. other
173 * TX frames)
174 */
175 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
176 sc->tx.seq_no += 0x10;
177 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
178 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
179 }
180
181 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
182 skb->len, DMA_TO_DEVICE);
183 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
184 dev_kfree_skb_any(skb);
185 bf->bf_mpdu = NULL;
186 bf->bf_buf_addr = 0;
187 ath_err(common, "dma_mapping_error on beaconing\n");
188 return NULL;
189 }
190
191 skb = ieee80211_get_buffered_bc(hw, vif);
192
193 /*
194 * if the CABQ traffic from previous DTIM is pending and the current
195 * beacon is also a DTIM.
196 * 1) if there is only one vif let the cab traffic continue.
197 * 2) if there are more than one vif and we are using staggered
198 * beacons, then drain the cabq by dropping all the frames in
199 * the cabq so that the current vifs cab traffic can be scheduled.
200 */
201 spin_lock_bh(&cabq->axq_lock);
202 cabq_depth = cabq->axq_depth;
203 spin_unlock_bh(&cabq->axq_lock);
204
205 if (skb && cabq_depth) {
206 if (sc->nvifs > 1) {
207 ath_dbg(common, ATH_DBG_BEACON,
208 "Flushing previous cabq traffic\n");
209 ath_draintxq(sc, cabq, false);
210 }
211 }
212
213 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
214
215 while (skb) {
216 ath_tx_cabq(hw, skb);
217 skb = ieee80211_get_buffered_bc(hw, vif);
218 }
219
220 return bf;
221 }
222
ath_beacon_alloc(struct ath_softc * sc,struct ieee80211_vif * vif)223 int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
224 {
225 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
226 struct ath_vif *avp;
227 struct ath_buf *bf;
228 struct sk_buff *skb;
229 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
230 __le64 tstamp;
231
232 avp = (void *)vif->drv_priv;
233
234 /* Allocate a beacon descriptor if we haven't done so. */
235 if (!avp->av_bcbuf) {
236 /* Allocate beacon state for hostap/ibss. We know
237 * a buffer is available. */
238 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
239 struct ath_buf, list);
240 list_del(&avp->av_bcbuf->list);
241
242 if (ath9k_uses_beacons(vif->type)) {
243 int slot;
244 /*
245 * Assign the vif to a beacon xmit slot. As
246 * above, this cannot fail to find one.
247 */
248 avp->av_bslot = 0;
249 for (slot = 0; slot < ATH_BCBUF; slot++)
250 if (sc->beacon.bslot[slot] == NULL) {
251 avp->av_bslot = slot;
252 avp->is_bslot_active = false;
253
254 /* NB: keep looking for a double slot */
255 if (slot == 0 || !sc->beacon.bslot[slot-1])
256 break;
257 }
258 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
259 sc->beacon.bslot[avp->av_bslot] = vif;
260 sc->nbcnvifs++;
261 }
262 }
263
264 /* release the previous beacon frame, if it already exists. */
265 bf = avp->av_bcbuf;
266 if (bf->bf_mpdu != NULL) {
267 skb = bf->bf_mpdu;
268 dma_unmap_single(sc->dev, bf->bf_buf_addr,
269 skb->len, DMA_TO_DEVICE);
270 dev_kfree_skb_any(skb);
271 bf->bf_mpdu = NULL;
272 bf->bf_buf_addr = 0;
273 }
274
275 /* NB: the beacon data buffer must be 32-bit aligned. */
276 skb = ieee80211_beacon_get(sc->hw, vif);
277 if (skb == NULL)
278 return -ENOMEM;
279
280 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
281 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
282 /* Calculate a TSF adjustment factor required for staggered beacons. */
283 if (avp->av_bslot > 0) {
284 u64 tsfadjust;
285 int intval;
286
287 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
288
289 /*
290 * Calculate the TSF offset for this beacon slot, i.e., the
291 * number of usecs that need to be added to the timestamp field
292 * in Beacon and Probe Response frames. Beacon slot 0 is
293 * processed at the correct offset, so it does not require TSF
294 * adjustment. Other slots are adjusted to get the timestamp
295 * close to the TBTT for the BSS.
296 */
297 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
298 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
299
300 ath_dbg(common, ATH_DBG_BEACON,
301 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
302 avp->av_bslot, intval, (unsigned long long)tsfadjust);
303
304 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
305 avp->tsf_adjust;
306 } else
307 avp->tsf_adjust = cpu_to_le64(0);
308
309 bf->bf_mpdu = skb;
310 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
311 skb->len, DMA_TO_DEVICE);
312 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
313 dev_kfree_skb_any(skb);
314 bf->bf_mpdu = NULL;
315 bf->bf_buf_addr = 0;
316 ath_err(common, "dma_mapping_error on beacon alloc\n");
317 return -ENOMEM;
318 }
319 avp->is_bslot_active = true;
320
321 return 0;
322 }
323
ath_beacon_return(struct ath_softc * sc,struct ath_vif * avp)324 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
325 {
326 if (avp->av_bcbuf != NULL) {
327 struct ath_buf *bf;
328
329 if (avp->av_bslot != -1) {
330 sc->beacon.bslot[avp->av_bslot] = NULL;
331 sc->nbcnvifs--;
332 }
333
334 bf = avp->av_bcbuf;
335 if (bf->bf_mpdu != NULL) {
336 struct sk_buff *skb = bf->bf_mpdu;
337 dma_unmap_single(sc->dev, bf->bf_buf_addr,
338 skb->len, DMA_TO_DEVICE);
339 dev_kfree_skb_any(skb);
340 bf->bf_mpdu = NULL;
341 bf->bf_buf_addr = 0;
342 }
343 list_add_tail(&bf->list, &sc->beacon.bbuf);
344
345 avp->av_bcbuf = NULL;
346 }
347 }
348
ath_beacon_tasklet(unsigned long data)349 void ath_beacon_tasklet(unsigned long data)
350 {
351 struct ath_softc *sc = (struct ath_softc *)data;
352 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
353 struct ath_hw *ah = sc->sc_ah;
354 struct ath_common *common = ath9k_hw_common(ah);
355 struct ath_buf *bf = NULL;
356 struct ieee80211_vif *vif;
357 int slot;
358 u32 bfaddr, bc = 0, tsftu;
359 u64 tsf;
360 u16 intval;
361
362 /*
363 * Check if the previous beacon has gone out. If
364 * not don't try to post another, skip this period
365 * and wait for the next. Missed beacons indicate
366 * a problem and should not occur. If we miss too
367 * many consecutive beacons reset the device.
368 */
369 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
370 sc->beacon.bmisscnt++;
371
372 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
373 ath_dbg(common, ATH_DBG_BSTUCK,
374 "missed %u consecutive beacons\n",
375 sc->beacon.bmisscnt);
376 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
377 ath9k_hw_bstuck_nfcal(ah);
378 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
379 ath_dbg(common, ATH_DBG_BSTUCK,
380 "beacon is officially stuck\n");
381 sc->sc_flags |= SC_OP_TSF_RESET;
382 ath_reset(sc, true);
383 }
384
385 return;
386 }
387
388 if (sc->beacon.bmisscnt != 0) {
389 ath_dbg(common, ATH_DBG_BSTUCK,
390 "resume beacon xmit after %u misses\n",
391 sc->beacon.bmisscnt);
392 sc->beacon.bmisscnt = 0;
393 }
394
395 /*
396 * Generate beacon frames. we are sending frames
397 * staggered so calculate the slot for this frame based
398 * on the tsf to safeguard against missing an swba.
399 */
400
401 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
402
403 tsf = ath9k_hw_gettsf64(ah);
404 tsftu = TSF_TO_TU(tsf>>32, tsf);
405 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
406 /*
407 * Reverse the slot order to get slot 0 on the TBTT offset that does
408 * not require TSF adjustment and other slots adding
409 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
410 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
411 * and slot 0 is at correct offset to TBTT.
412 */
413 slot = ATH_BCBUF - slot - 1;
414 vif = sc->beacon.bslot[slot];
415
416 ath_dbg(common, ATH_DBG_BEACON,
417 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
418 slot, tsf, tsftu, intval, vif);
419
420 bfaddr = 0;
421 if (vif) {
422 bf = ath_beacon_generate(sc->hw, vif);
423 if (bf != NULL) {
424 bfaddr = bf->bf_daddr;
425 bc = 1;
426 }
427 }
428
429 /*
430 * Handle slot time change when a non-ERP station joins/leaves
431 * an 11g network. The 802.11 layer notifies us via callback,
432 * we mark updateslot, then wait one beacon before effecting
433 * the change. This gives associated stations at least one
434 * beacon interval to note the state change.
435 *
436 * NB: The slot time change state machine is clocked according
437 * to whether we are bursting or staggering beacons. We
438 * recognize the request to update and record the current
439 * slot then don't transition until that slot is reached
440 * again. If we miss a beacon for that slot then we'll be
441 * slow to transition but we'll be sure at least one beacon
442 * interval has passed. When bursting slot is always left
443 * set to ATH_BCBUF so this check is a noop.
444 */
445 if (sc->beacon.updateslot == UPDATE) {
446 sc->beacon.updateslot = COMMIT; /* commit next beacon */
447 sc->beacon.slotupdate = slot;
448 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
449 ah->slottime = sc->beacon.slottime;
450 ath9k_hw_init_global_settings(ah);
451 sc->beacon.updateslot = OK;
452 }
453 if (bfaddr != 0) {
454 /* NB: cabq traffic should already be queued and primed */
455 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
456 ath9k_hw_txstart(ah, sc->beacon.beaconq);
457
458 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
459 }
460 }
461
ath9k_beacon_init(struct ath_softc * sc,u32 next_beacon,u32 beacon_period)462 static void ath9k_beacon_init(struct ath_softc *sc,
463 u32 next_beacon,
464 u32 beacon_period)
465 {
466 if (beacon_period & ATH9K_BEACON_RESET_TSF)
467 ath9k_ps_wakeup(sc);
468
469 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
470
471 if (beacon_period & ATH9K_BEACON_RESET_TSF)
472 ath9k_ps_restore(sc);
473 }
474
475 /*
476 * For multi-bss ap support beacons are either staggered evenly over N slots or
477 * burst together. For the former arrange for the SWBA to be delivered for each
478 * slot. Slots that are not occupied will generate nothing.
479 */
ath_beacon_config_ap(struct ath_softc * sc,struct ath_beacon_config * conf)480 static void ath_beacon_config_ap(struct ath_softc *sc,
481 struct ath_beacon_config *conf)
482 {
483 struct ath_hw *ah = sc->sc_ah;
484 u32 nexttbtt, intval;
485
486 /* NB: the beacon interval is kept internally in TU's */
487 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
488 intval /= ATH_BCBUF; /* for staggered beacons */
489 nexttbtt = intval;
490
491 if (sc->sc_flags & SC_OP_TSF_RESET)
492 intval |= ATH9K_BEACON_RESET_TSF;
493
494 /*
495 * In AP mode we enable the beacon timers and SWBA interrupts to
496 * prepare beacon frames.
497 */
498 intval |= ATH9K_BEACON_ENA;
499 ah->imask |= ATH9K_INT_SWBA;
500 ath_beaconq_config(sc);
501
502 /* Set the computed AP beacon timers */
503
504 ath9k_hw_disable_interrupts(ah);
505 ath9k_beacon_init(sc, nexttbtt, intval);
506 sc->beacon.bmisscnt = 0;
507 ath9k_hw_set_interrupts(ah, ah->imask);
508
509 /* Clear the reset TSF flag, so that subsequent beacon updation
510 will not reset the HW TSF. */
511
512 sc->sc_flags &= ~SC_OP_TSF_RESET;
513 }
514
515 /*
516 * This sets up the beacon timers according to the timestamp of the last
517 * received beacon and the current TSF, configures PCF and DTIM
518 * handling, programs the sleep registers so the hardware will wakeup in
519 * time to receive beacons, and configures the beacon miss handling so
520 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
521 * we've associated with.
522 */
ath_beacon_config_sta(struct ath_softc * sc,struct ath_beacon_config * conf)523 static void ath_beacon_config_sta(struct ath_softc *sc,
524 struct ath_beacon_config *conf)
525 {
526 struct ath_hw *ah = sc->sc_ah;
527 struct ath_common *common = ath9k_hw_common(ah);
528 struct ath9k_beacon_state bs;
529 int dtimperiod, dtimcount, sleepduration;
530 int cfpperiod, cfpcount;
531 u32 nexttbtt = 0, intval, tsftu;
532 u64 tsf;
533 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
534
535 /* No need to configure beacon if we are not associated */
536 if (!common->curaid) {
537 ath_dbg(common, ATH_DBG_BEACON,
538 "STA is not yet associated..skipping beacon config\n");
539 return;
540 }
541
542 memset(&bs, 0, sizeof(bs));
543 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
544
545 /*
546 * Setup dtim and cfp parameters according to
547 * last beacon we received (which may be none).
548 */
549 dtimperiod = conf->dtim_period;
550 dtimcount = conf->dtim_count;
551 if (dtimcount >= dtimperiod) /* NB: sanity check */
552 dtimcount = 0;
553 cfpperiod = 1; /* NB: no PCF support yet */
554 cfpcount = 0;
555
556 sleepduration = conf->listen_interval * intval;
557
558 /*
559 * Pull nexttbtt forward to reflect the current
560 * TSF and calculate dtim+cfp state for the result.
561 */
562 tsf = ath9k_hw_gettsf64(ah);
563 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
564
565 num_beacons = tsftu / intval + 1;
566 offset = tsftu % intval;
567 nexttbtt = tsftu - offset;
568 if (offset)
569 nexttbtt += intval;
570
571 /* DTIM Beacon every dtimperiod Beacon */
572 dtim_dec_count = num_beacons % dtimperiod;
573 /* CFP every cfpperiod DTIM Beacon */
574 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
575 if (dtim_dec_count)
576 cfp_dec_count++;
577
578 dtimcount -= dtim_dec_count;
579 if (dtimcount < 0)
580 dtimcount += dtimperiod;
581
582 cfpcount -= cfp_dec_count;
583 if (cfpcount < 0)
584 cfpcount += cfpperiod;
585
586 bs.bs_intval = intval;
587 bs.bs_nexttbtt = nexttbtt;
588 bs.bs_dtimperiod = dtimperiod*intval;
589 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
590 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
591 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
592 bs.bs_cfpmaxduration = 0;
593
594 /*
595 * Calculate the number of consecutive beacons to miss* before taking
596 * a BMISS interrupt. The configuration is specified in TU so we only
597 * need calculate based on the beacon interval. Note that we clamp the
598 * result to at most 15 beacons.
599 */
600 if (sleepduration > intval) {
601 bs.bs_bmissthreshold = conf->listen_interval *
602 ATH_DEFAULT_BMISS_LIMIT / 2;
603 } else {
604 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
605 if (bs.bs_bmissthreshold > 15)
606 bs.bs_bmissthreshold = 15;
607 else if (bs.bs_bmissthreshold <= 0)
608 bs.bs_bmissthreshold = 1;
609 }
610
611 /*
612 * Calculate sleep duration. The configuration is given in ms.
613 * We ensure a multiple of the beacon period is used. Also, if the sleep
614 * duration is greater than the DTIM period then it makes senses
615 * to make it a multiple of that.
616 *
617 * XXX fixed at 100ms
618 */
619
620 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
621 if (bs.bs_sleepduration > bs.bs_dtimperiod)
622 bs.bs_sleepduration = bs.bs_dtimperiod;
623
624 /* TSF out of range threshold fixed at 1 second */
625 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
626
627 ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
628 ath_dbg(common, ATH_DBG_BEACON,
629 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
630 bs.bs_bmissthreshold, bs.bs_sleepduration,
631 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
632
633 /* Set the computed STA beacon timers */
634
635 ath9k_hw_disable_interrupts(ah);
636 ath9k_hw_set_sta_beacon_timers(ah, &bs);
637 ah->imask |= ATH9K_INT_BMISS;
638 ath9k_hw_set_interrupts(ah, ah->imask);
639 }
640
ath_beacon_config_adhoc(struct ath_softc * sc,struct ath_beacon_config * conf)641 static void ath_beacon_config_adhoc(struct ath_softc *sc,
642 struct ath_beacon_config *conf)
643 {
644 struct ath_hw *ah = sc->sc_ah;
645 struct ath_common *common = ath9k_hw_common(ah);
646 u64 tsf;
647 u32 tsftu, intval, nexttbtt;
648
649 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
650
651
652 /* Pull nexttbtt forward to reflect the current TSF */
653
654 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
655 if (nexttbtt == 0)
656 nexttbtt = intval;
657 else if (intval)
658 nexttbtt = roundup(nexttbtt, intval);
659
660 tsf = ath9k_hw_gettsf64(ah);
661 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
662 do {
663 nexttbtt += intval;
664 } while (nexttbtt < tsftu);
665
666 ath_dbg(common, ATH_DBG_BEACON,
667 "IBSS nexttbtt %u intval %u (%u)\n",
668 nexttbtt, intval, conf->beacon_interval);
669
670 /*
671 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
672 * if we need to manually prepare beacon frames. Otherwise we use a
673 * self-linked tx descriptor and let the hardware deal with things.
674 */
675 intval |= ATH9K_BEACON_ENA;
676 ah->imask |= ATH9K_INT_SWBA;
677
678 ath_beaconq_config(sc);
679
680 /* Set the computed ADHOC beacon timers */
681
682 ath9k_hw_disable_interrupts(ah);
683 ath9k_beacon_init(sc, nexttbtt, intval);
684 sc->beacon.bmisscnt = 0;
685 ath9k_hw_set_interrupts(ah, ah->imask);
686 }
687
ath_beacon_config(struct ath_softc * sc,struct ieee80211_vif * vif)688 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
689 {
690 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
691 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
692 enum nl80211_iftype iftype;
693
694 /* Setup the beacon configuration parameters */
695 if (vif) {
696 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
697 iftype = vif->type;
698 cur_conf->beacon_interval = bss_conf->beacon_int;
699 cur_conf->dtim_period = bss_conf->dtim_period;
700 } else {
701 iftype = sc->sc_ah->opmode;
702 }
703
704 cur_conf->listen_interval = 1;
705 cur_conf->dtim_count = 1;
706 cur_conf->bmiss_timeout =
707 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
708
709 /*
710 * It looks like mac80211 may end up using beacon interval of zero in
711 * some cases (at least for mesh point). Avoid getting into an
712 * infinite loop by using a bit safer value instead. To be safe,
713 * do sanity check on beacon interval for all operating modes.
714 */
715 if (cur_conf->beacon_interval == 0)
716 cur_conf->beacon_interval = 100;
717
718 /*
719 * We don't parse dtim period from mac80211 during the driver
720 * initialization as it breaks association with hidden-ssid
721 * AP and it causes latency in roaming
722 */
723 if (cur_conf->dtim_period == 0)
724 cur_conf->dtim_period = 1;
725
726 switch (iftype) {
727 case NL80211_IFTYPE_AP:
728 ath_beacon_config_ap(sc, cur_conf);
729 break;
730 case NL80211_IFTYPE_ADHOC:
731 case NL80211_IFTYPE_MESH_POINT:
732 ath_beacon_config_adhoc(sc, cur_conf);
733 break;
734 case NL80211_IFTYPE_STATION:
735 ath_beacon_config_sta(sc, cur_conf);
736 break;
737 default:
738 ath_dbg(common, ATH_DBG_CONFIG,
739 "Unsupported beaconing mode\n");
740 return;
741 }
742
743 sc->sc_flags |= SC_OP_BEACONS;
744 }
745
ath9k_set_beaconing_status(struct ath_softc * sc,bool status)746 void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
747 {
748 struct ath_hw *ah = sc->sc_ah;
749 struct ath_vif *avp;
750 int slot;
751 bool found = false;
752
753 ath9k_ps_wakeup(sc);
754 if (status) {
755 for (slot = 0; slot < ATH_BCBUF; slot++) {
756 if (sc->beacon.bslot[slot]) {
757 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
758 if (avp->is_bslot_active) {
759 found = true;
760 break;
761 }
762 }
763 }
764 if (found) {
765 /* Re-enable beaconing */
766 ah->imask |= ATH9K_INT_SWBA;
767 ath9k_hw_set_interrupts(ah, ah->imask);
768 }
769 } else {
770 /* Disable SWBA interrupt */
771 ah->imask &= ~ATH9K_INT_SWBA;
772 ath9k_hw_set_interrupts(ah, ah->imask);
773 tasklet_kill(&sc->bcon_tasklet);
774 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
775 }
776 ath9k_ps_restore(sc);
777 }
778