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 */
26 static int ath_beaconq_config(struct ath_softc *sc)
27 {
28 struct ath_hw *ah = sc->sc_ah;
29 struct ath9k_tx_queue_info qi;
30
31 ath9k_hw_get_txq_props(ah, sc->beacon.beaconq, &qi);
32 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
33 /* Always burst out beacon and CAB traffic. */
34 qi.tqi_aifs = 1;
35 qi.tqi_cwmin = 0;
36 qi.tqi_cwmax = 0;
37 } else {
38 /* Adhoc mode; important thing is to use 2x cwmin. */
39 qi.tqi_aifs = sc->beacon.beacon_qi.tqi_aifs;
40 qi.tqi_cwmin = 2*sc->beacon.beacon_qi.tqi_cwmin;
41 qi.tqi_cwmax = sc->beacon.beacon_qi.tqi_cwmax;
42 }
43
44 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
45 DPRINTF(sc, ATH_DBG_FATAL,
46 "Unable to update h/w beacon queue parameters\n");
47 return 0;
48 } else {
49 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
50 return 1;
51 }
52 }
53
54 /*
55 * Associates the beacon frame buffer with a transmit descriptor. Will set
56 * up all required antenna switch parameters, rate codes, and channel flags.
57 * Beacons are always sent out at the lowest rate, and are not retried.
58 */
59 static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
60 struct ath_buf *bf)
61 {
62 struct sk_buff *skb = bf->bf_mpdu;
63 struct ath_hw *ah = sc->sc_ah;
64 struct ath_desc *ds;
65 struct ath9k_11n_rate_series series[4];
66 const struct ath_rate_table *rt;
67 int flags, antenna, ctsrate = 0, ctsduration = 0;
68 u8 rate;
69
70 ds = bf->bf_desc;
71 flags = ATH9K_TXDESC_NOACK;
72
73 if (((sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) ||
74 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT)) &&
75 (ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
76 ds->ds_link = bf->bf_daddr; /* self-linked */
77 flags |= ATH9K_TXDESC_VEOL;
78 /* Let hardware handle antenna switching. */
79 antenna = 0;
80 } else {
81 ds->ds_link = 0;
82 /*
83 * Switch antenna every beacon.
84 * Should only switch every beacon period, not for every SWBA
85 * XXX assumes two antennae
86 */
87 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
88 }
89
90 ds->ds_data = bf->bf_buf_addr;
91
92 rt = sc->cur_rate_table;
93 rate = rt->info[0].ratecode;
94 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
95 rate |= rt->info[0].short_preamble;
96
97 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
98 ATH9K_PKT_TYPE_BEACON,
99 MAX_RATE_POWER,
100 ATH9K_TXKEYIX_INVALID,
101 ATH9K_KEY_TYPE_CLEAR,
102 flags);
103
104 /* NB: beacon's BufLen must be a multiple of 4 bytes */
105 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
106 true, true, ds);
107
108 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
109 series[0].Tries = 1;
110 series[0].Rate = rate;
111 series[0].ChSel = sc->tx_chainmask;
112 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
113 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
114 series, 4, 0);
115 }
116
117 static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
118 struct ieee80211_vif *vif)
119 {
120 struct ath_wiphy *aphy = hw->priv;
121 struct ath_softc *sc = aphy->sc;
122 struct ath_buf *bf;
123 struct ath_vif *avp;
124 struct sk_buff *skb;
125 struct ath_txq *cabq;
126 struct ieee80211_tx_info *info;
127 int cabq_depth;
128
129 if (aphy->state != ATH_WIPHY_ACTIVE)
130 return NULL;
131
132 avp = (void *)vif->drv_priv;
133 cabq = sc->beacon.cabq;
134
135 if (avp->av_bcbuf == NULL)
136 return NULL;
137
138 /* Release the old beacon first */
139
140 bf = avp->av_bcbuf;
141 skb = bf->bf_mpdu;
142 if (skb) {
143 dma_unmap_single(sc->dev, bf->bf_dmacontext,
144 skb->len, DMA_TO_DEVICE);
145 dev_kfree_skb_any(skb);
146 }
147
148 /* Get a new beacon from mac80211 */
149
150 skb = ieee80211_beacon_get(hw, vif);
151 bf->bf_mpdu = skb;
152 if (skb == NULL)
153 return NULL;
154 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
155 avp->tsf_adjust;
156
157 info = IEEE80211_SKB_CB(skb);
158 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
159 /*
160 * TODO: make sure the seq# gets assigned properly (vs. other
161 * TX frames)
162 */
163 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
164 sc->tx.seq_no += 0x10;
165 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
166 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
167 }
168
169 bf->bf_buf_addr = bf->bf_dmacontext =
170 dma_map_single(sc->dev, skb->data,
171 skb->len, DMA_TO_DEVICE);
172 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
173 dev_kfree_skb_any(skb);
174 bf->bf_mpdu = NULL;
175 DPRINTF(sc, ATH_DBG_FATAL, "dma_mapping_error on beaconing\n");
176 return NULL;
177 }
178
179 skb = ieee80211_get_buffered_bc(hw, vif);
180
181 /*
182 * if the CABQ traffic from previous DTIM is pending and the current
183 * beacon is also a DTIM.
184 * 1) if there is only one vif let the cab traffic continue.
185 * 2) if there are more than one vif and we are using staggered
186 * beacons, then drain the cabq by dropping all the frames in
187 * the cabq so that the current vifs cab traffic can be scheduled.
188 */
189 spin_lock_bh(&cabq->axq_lock);
190 cabq_depth = cabq->axq_depth;
191 spin_unlock_bh(&cabq->axq_lock);
192
193 if (skb && cabq_depth) {
194 if (sc->nvifs > 1) {
195 DPRINTF(sc, ATH_DBG_BEACON,
196 "Flushing previous cabq traffic\n");
197 ath_draintxq(sc, cabq, false);
198 }
199 }
200
201 ath_beacon_setup(sc, avp, bf);
202
203 while (skb) {
204 ath_tx_cabq(hw, skb);
205 skb = ieee80211_get_buffered_bc(hw, vif);
206 }
207
208 return bf;
209 }
210
211 /*
212 * Startup beacon transmission for adhoc mode when they are sent entirely
213 * by the hardware using the self-linked descriptor + veol trick.
214 */
215 static void ath_beacon_start_adhoc(struct ath_softc *sc,
216 struct ieee80211_vif *vif)
217 {
218 struct ath_hw *ah = sc->sc_ah;
219 struct ath_buf *bf;
220 struct ath_vif *avp;
221 struct sk_buff *skb;
222
223 avp = (void *)vif->drv_priv;
224
225 if (avp->av_bcbuf == NULL)
226 return;
227
228 bf = avp->av_bcbuf;
229 skb = bf->bf_mpdu;
230
231 ath_beacon_setup(sc, avp, bf);
232
233 /* NB: caller is known to have already stopped tx dma */
234 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bf->bf_daddr);
235 ath9k_hw_txstart(ah, sc->beacon.beaconq);
236 DPRINTF(sc, ATH_DBG_BEACON, "TXDP%u = %llx (%p)\n",
237 sc->beacon.beaconq, ito64(bf->bf_daddr), bf->bf_desc);
238 }
239
240 int ath_beaconq_setup(struct ath_hw *ah)
241 {
242 struct ath9k_tx_queue_info qi;
243
244 memset(&qi, 0, sizeof(qi));
245 qi.tqi_aifs = 1;
246 qi.tqi_cwmin = 0;
247 qi.tqi_cwmax = 0;
248 /* NB: don't enable any interrupts */
249 return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi);
250 }
251
252 int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
253 {
254 struct ath_softc *sc = aphy->sc;
255 struct ath_vif *avp;
256 struct ath_buf *bf;
257 struct sk_buff *skb;
258 __le64 tstamp;
259
260 avp = (void *)vif->drv_priv;
261
262 /* Allocate a beacon descriptor if we haven't done so. */
263 if (!avp->av_bcbuf) {
264 /* Allocate beacon state for hostap/ibss. We know
265 * a buffer is available. */
266 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
267 struct ath_buf, list);
268 list_del(&avp->av_bcbuf->list);
269
270 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP ||
271 !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
272 int slot;
273 /*
274 * Assign the vif to a beacon xmit slot. As
275 * above, this cannot fail to find one.
276 */
277 avp->av_bslot = 0;
278 for (slot = 0; slot < ATH_BCBUF; slot++)
279 if (sc->beacon.bslot[slot] == NULL) {
280 /*
281 * XXX hack, space out slots to better
282 * deal with misses
283 */
284 if (slot+1 < ATH_BCBUF &&
285 sc->beacon.bslot[slot+1] == NULL) {
286 avp->av_bslot = slot+1;
287 break;
288 }
289 avp->av_bslot = slot;
290 /* NB: keep looking for a double slot */
291 }
292 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
293 sc->beacon.bslot[avp->av_bslot] = vif;
294 sc->beacon.bslot_aphy[avp->av_bslot] = aphy;
295 sc->nbcnvifs++;
296 }
297 }
298
299 /* release the previous beacon frame, if it already exists. */
300 bf = avp->av_bcbuf;
301 if (bf->bf_mpdu != NULL) {
302 skb = bf->bf_mpdu;
303 dma_unmap_single(sc->dev, bf->bf_dmacontext,
304 skb->len, DMA_TO_DEVICE);
305 dev_kfree_skb_any(skb);
306 bf->bf_mpdu = NULL;
307 }
308
309 /* NB: the beacon data buffer must be 32-bit aligned. */
310 skb = ieee80211_beacon_get(sc->hw, vif);
311 if (skb == NULL) {
312 DPRINTF(sc, ATH_DBG_BEACON, "cannot get skb\n");
313 return -ENOMEM;
314 }
315
316 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
317 sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
318 /* Calculate a TSF adjustment factor required for staggered beacons. */
319 if (avp->av_bslot > 0) {
320 u64 tsfadjust;
321 int intval;
322
323 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
324
325 /*
326 * Calculate the TSF offset for this beacon slot, i.e., the
327 * number of usecs that need to be added to the timestamp field
328 * in Beacon and Probe Response frames. Beacon slot 0 is
329 * processed at the correct offset, so it does not require TSF
330 * adjustment. Other slots are adjusted to get the timestamp
331 * close to the TBTT for the BSS.
332 */
333 tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
334 avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
335
336 DPRINTF(sc, ATH_DBG_BEACON,
337 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
338 avp->av_bslot, intval, (unsigned long long)tsfadjust);
339
340 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
341 avp->tsf_adjust;
342 } else
343 avp->tsf_adjust = cpu_to_le64(0);
344
345 bf->bf_mpdu = skb;
346 bf->bf_buf_addr = bf->bf_dmacontext =
347 dma_map_single(sc->dev, skb->data,
348 skb->len, DMA_TO_DEVICE);
349 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
350 dev_kfree_skb_any(skb);
351 bf->bf_mpdu = NULL;
352 DPRINTF(sc, ATH_DBG_FATAL,
353 "dma_mapping_error on beacon alloc\n");
354 return -ENOMEM;
355 }
356
357 return 0;
358 }
359
360 void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
361 {
362 if (avp->av_bcbuf != NULL) {
363 struct ath_buf *bf;
364
365 if (avp->av_bslot != -1) {
366 sc->beacon.bslot[avp->av_bslot] = NULL;
367 sc->beacon.bslot_aphy[avp->av_bslot] = NULL;
368 sc->nbcnvifs--;
369 }
370
371 bf = avp->av_bcbuf;
372 if (bf->bf_mpdu != NULL) {
373 struct sk_buff *skb = bf->bf_mpdu;
374 dma_unmap_single(sc->dev, bf->bf_dmacontext,
375 skb->len, DMA_TO_DEVICE);
376 dev_kfree_skb_any(skb);
377 bf->bf_mpdu = NULL;
378 }
379 list_add_tail(&bf->list, &sc->beacon.bbuf);
380
381 avp->av_bcbuf = NULL;
382 }
383 }
384
385 void ath_beacon_tasklet(unsigned long data)
386 {
387 struct ath_softc *sc = (struct ath_softc *)data;
388 struct ath_hw *ah = sc->sc_ah;
389 struct ath_buf *bf = NULL;
390 struct ieee80211_vif *vif;
391 struct ath_wiphy *aphy;
392 int slot;
393 u32 bfaddr, bc = 0, tsftu;
394 u64 tsf;
395 u16 intval;
396
397 /*
398 * Check if the previous beacon has gone out. If
399 * not don't try to post another, skip this period
400 * and wait for the next. Missed beacons indicate
401 * a problem and should not occur. If we miss too
402 * many consecutive beacons reset the device.
403 */
404 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
405 sc->beacon.bmisscnt++;
406
407 if (sc->beacon.bmisscnt < BSTUCK_THRESH) {
408 DPRINTF(sc, ATH_DBG_BEACON,
409 "missed %u consecutive beacons\n",
410 sc->beacon.bmisscnt);
411 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
412 DPRINTF(sc, ATH_DBG_BEACON,
413 "beacon is officially stuck\n");
414 sc->sc_flags |= SC_OP_TSF_RESET;
415 ath_reset(sc, false);
416 }
417
418 return;
419 }
420
421 if (sc->beacon.bmisscnt != 0) {
422 DPRINTF(sc, ATH_DBG_BEACON,
423 "resume beacon xmit after %u misses\n",
424 sc->beacon.bmisscnt);
425 sc->beacon.bmisscnt = 0;
426 }
427
428 /*
429 * Generate beacon frames. we are sending frames
430 * staggered so calculate the slot for this frame based
431 * on the tsf to safeguard against missing an swba.
432 */
433
434 intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
435
436 tsf = ath9k_hw_gettsf64(ah);
437 tsftu = TSF_TO_TU(tsf>>32, tsf);
438 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
439 /*
440 * Reverse the slot order to get slot 0 on the TBTT offset that does
441 * not require TSF adjustment and other slots adding
442 * slot/ATH_BCBUF * beacon_int to timestamp. For example, with
443 * ATH_BCBUF = 4, we process beacon slots as follows: 3 2 1 0 3 2 1 ..
444 * and slot 0 is at correct offset to TBTT.
445 */
446 slot = ATH_BCBUF - slot - 1;
447 vif = sc->beacon.bslot[slot];
448 aphy = sc->beacon.bslot_aphy[slot];
449
450 DPRINTF(sc, ATH_DBG_BEACON,
451 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
452 slot, tsf, tsftu, intval, vif);
453
454 bfaddr = 0;
455 if (vif) {
456 bf = ath_beacon_generate(aphy->hw, vif);
457 if (bf != NULL) {
458 bfaddr = bf->bf_daddr;
459 bc = 1;
460 }
461 }
462
463 /*
464 * Handle slot time change when a non-ERP station joins/leaves
465 * an 11g network. The 802.11 layer notifies us via callback,
466 * we mark updateslot, then wait one beacon before effecting
467 * the change. This gives associated stations at least one
468 * beacon interval to note the state change.
469 *
470 * NB: The slot time change state machine is clocked according
471 * to whether we are bursting or staggering beacons. We
472 * recognize the request to update and record the current
473 * slot then don't transition until that slot is reached
474 * again. If we miss a beacon for that slot then we'll be
475 * slow to transition but we'll be sure at least one beacon
476 * interval has passed. When bursting slot is always left
477 * set to ATH_BCBUF so this check is a noop.
478 */
479 if (sc->beacon.updateslot == UPDATE) {
480 sc->beacon.updateslot = COMMIT; /* commit next beacon */
481 sc->beacon.slotupdate = slot;
482 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
483 ath9k_hw_setslottime(sc->sc_ah, sc->beacon.slottime);
484 sc->beacon.updateslot = OK;
485 }
486 if (bfaddr != 0) {
487 /*
488 * Stop any current dma and put the new frame(s) on the queue.
489 * This should never fail since we check above that no frames
490 * are still pending on the queue.
491 */
492 if (!ath9k_hw_stoptxdma(ah, sc->beacon.beaconq)) {
493 DPRINTF(sc, ATH_DBG_FATAL,
494 "beacon queue %u did not stop?\n", sc->beacon.beaconq);
495 }
496
497 /* NB: cabq traffic should already be queued and primed */
498 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
499 ath9k_hw_txstart(ah, sc->beacon.beaconq);
500
501 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
502 }
503 }
504
505 /*
506 * For multi-bss ap support beacons are either staggered evenly over N slots or
507 * burst together. For the former arrange for the SWBA to be delivered for each
508 * slot. Slots that are not occupied will generate nothing.
509 */
510 static void ath_beacon_config_ap(struct ath_softc *sc,
511 struct ath_beacon_config *conf)
512 {
513 u32 nexttbtt, intval;
514
515 /* Configure the timers only when the TSF has to be reset */
516
517 if (!(sc->sc_flags & SC_OP_TSF_RESET))
518 return;
519
520 /* NB: the beacon interval is kept internally in TU's */
521 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
522 intval /= ATH_BCBUF; /* for staggered beacons */
523 nexttbtt = intval;
524 intval |= ATH9K_BEACON_RESET_TSF;
525
526 /*
527 * In AP mode we enable the beacon timers and SWBA interrupts to
528 * prepare beacon frames.
529 */
530 intval |= ATH9K_BEACON_ENA;
531 sc->imask |= ATH9K_INT_SWBA;
532 ath_beaconq_config(sc);
533
534 /* Set the computed AP beacon timers */
535
536 ath9k_hw_set_interrupts(sc->sc_ah, 0);
537 ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval);
538 sc->beacon.bmisscnt = 0;
539 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
540
541 /* Clear the reset TSF flag, so that subsequent beacon updation
542 will not reset the HW TSF. */
543
544 sc->sc_flags &= ~SC_OP_TSF_RESET;
545 }
546
547 /*
548 * This sets up the beacon timers according to the timestamp of the last
549 * received beacon and the current TSF, configures PCF and DTIM
550 * handling, programs the sleep registers so the hardware will wakeup in
551 * time to receive beacons, and configures the beacon miss handling so
552 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
553 * we've associated with.
554 */
555 static void ath_beacon_config_sta(struct ath_softc *sc,
556 struct ath_beacon_config *conf)
557 {
558 struct ath9k_beacon_state bs;
559 int dtimperiod, dtimcount, sleepduration;
560 int cfpperiod, cfpcount;
561 u32 nexttbtt = 0, intval, tsftu;
562 u64 tsf;
563 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
564
565 memset(&bs, 0, sizeof(bs));
566 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
567
568 /*
569 * Setup dtim and cfp parameters according to
570 * last beacon we received (which may be none).
571 */
572 dtimperiod = conf->dtim_period;
573 if (dtimperiod <= 0) /* NB: 0 if not known */
574 dtimperiod = 1;
575 dtimcount = conf->dtim_count;
576 if (dtimcount >= dtimperiod) /* NB: sanity check */
577 dtimcount = 0;
578 cfpperiod = 1; /* NB: no PCF support yet */
579 cfpcount = 0;
580
581 sleepduration = conf->listen_interval * intval;
582 if (sleepduration <= 0)
583 sleepduration = intval;
584
585 /*
586 * Pull nexttbtt forward to reflect the current
587 * TSF and calculate dtim+cfp state for the result.
588 */
589 tsf = ath9k_hw_gettsf64(sc->sc_ah);
590 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
591
592 num_beacons = tsftu / intval + 1;
593 offset = tsftu % intval;
594 nexttbtt = tsftu - offset;
595 if (offset)
596 nexttbtt += intval;
597
598 /* DTIM Beacon every dtimperiod Beacon */
599 dtim_dec_count = num_beacons % dtimperiod;
600 /* CFP every cfpperiod DTIM Beacon */
601 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
602 if (dtim_dec_count)
603 cfp_dec_count++;
604
605 dtimcount -= dtim_dec_count;
606 if (dtimcount < 0)
607 dtimcount += dtimperiod;
608
609 cfpcount -= cfp_dec_count;
610 if (cfpcount < 0)
611 cfpcount += cfpperiod;
612
613 bs.bs_intval = intval;
614 bs.bs_nexttbtt = nexttbtt;
615 bs.bs_dtimperiod = dtimperiod*intval;
616 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
617 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
618 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
619 bs.bs_cfpmaxduration = 0;
620
621 /*
622 * Calculate the number of consecutive beacons to miss* before taking
623 * a BMISS interrupt. The configuration is specified in TU so we only
624 * need calculate based on the beacon interval. Note that we clamp the
625 * result to at most 15 beacons.
626 */
627 if (sleepduration > intval) {
628 bs.bs_bmissthreshold = conf->listen_interval *
629 ATH_DEFAULT_BMISS_LIMIT / 2;
630 } else {
631 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
632 if (bs.bs_bmissthreshold > 15)
633 bs.bs_bmissthreshold = 15;
634 else if (bs.bs_bmissthreshold <= 0)
635 bs.bs_bmissthreshold = 1;
636 }
637
638 /*
639 * Calculate sleep duration. The configuration is given in ms.
640 * We ensure a multiple of the beacon period is used. Also, if the sleep
641 * duration is greater than the DTIM period then it makes senses
642 * to make it a multiple of that.
643 *
644 * XXX fixed at 100ms
645 */
646
647 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
648 if (bs.bs_sleepduration > bs.bs_dtimperiod)
649 bs.bs_sleepduration = bs.bs_dtimperiod;
650
651 /* TSF out of range threshold fixed at 1 second */
652 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
653
654 DPRINTF(sc, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
655 DPRINTF(sc, ATH_DBG_BEACON,
656 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
657 bs.bs_bmissthreshold, bs.bs_sleepduration,
658 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
659
660 /* Set the computed STA beacon timers */
661
662 ath9k_hw_set_interrupts(sc->sc_ah, 0);
663 ath9k_hw_set_sta_beacon_timers(sc->sc_ah, &bs);
664 sc->imask |= ATH9K_INT_BMISS;
665 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
666 }
667
668 static void ath_beacon_config_adhoc(struct ath_softc *sc,
669 struct ath_beacon_config *conf,
670 struct ieee80211_vif *vif)
671 {
672 u64 tsf;
673 u32 tsftu, intval, nexttbtt;
674
675 intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
676
677 /*
678 * It looks like mac80211 may end up using beacon interval of zero in
679 * some cases (at least for mesh point). Avoid getting into an
680 * infinite loop by using a bit safer value instead..
681 */
682 if (intval == 0)
683 intval = 100;
684
685 /* Pull nexttbtt forward to reflect the current TSF */
686
687 nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
688 if (nexttbtt == 0)
689 nexttbtt = intval;
690 else if (intval)
691 nexttbtt = roundup(nexttbtt, intval);
692
693 tsf = ath9k_hw_gettsf64(sc->sc_ah);
694 tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
695 do {
696 nexttbtt += intval;
697 } while (nexttbtt < tsftu);
698
699 DPRINTF(sc, ATH_DBG_BEACON,
700 "IBSS nexttbtt %u intval %u (%u)\n",
701 nexttbtt, intval, conf->beacon_interval);
702
703 /*
704 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
705 * if we need to manually prepare beacon frames. Otherwise we use a
706 * self-linked tx descriptor and let the hardware deal with things.
707 */
708 intval |= ATH9K_BEACON_ENA;
709 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL))
710 sc->imask |= ATH9K_INT_SWBA;
711
712 ath_beaconq_config(sc);
713
714 /* Set the computed ADHOC beacon timers */
715
716 ath9k_hw_set_interrupts(sc->sc_ah, 0);
717 ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval);
718 sc->beacon.bmisscnt = 0;
719 ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
720
721 /* FIXME: Handle properly when vif is NULL */
722 if (vif && sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_VEOL)
723 ath_beacon_start_adhoc(sc, vif);
724 }
725
726 void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
727 {
728 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
729 enum nl80211_iftype iftype;
730
731 /* Setup the beacon configuration parameters */
732
733 if (vif) {
734 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
735
736 iftype = vif->type;
737
738 cur_conf->beacon_interval = bss_conf->beacon_int;
739 cur_conf->dtim_period = bss_conf->dtim_period;
740 cur_conf->listen_interval = 1;
741 cur_conf->dtim_count = 1;
742 cur_conf->bmiss_timeout =
743 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
744 } else {
745 iftype = sc->sc_ah->opmode;
746 }
747
748
749 switch (iftype) {
750 case NL80211_IFTYPE_AP:
751 ath_beacon_config_ap(sc, cur_conf);
752 break;
753 case NL80211_IFTYPE_ADHOC:
754 case NL80211_IFTYPE_MESH_POINT:
755 ath_beacon_config_adhoc(sc, cur_conf, vif);
756 break;
757 case NL80211_IFTYPE_STATION:
758 ath_beacon_config_sta(sc, cur_conf);
759 break;
760 default:
761 DPRINTF(sc, ATH_DBG_CONFIG,
762 "Unsupported beaconing mode\n");
763 return;
764 }
765
766 sc->sc_flags |= SC_OP_BEACONS;
767 }
768
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