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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*/
33int ath_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 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
42 /* Always burst out beacon and CAB traffic. */
43 qi.tqi_aifs = 1;
44 qi.tqi_cwmin = 0;
45 qi.tqi_cwmax = 0;
46 } else {
47 /* Adhoc mode; important thing is to use 2x cwmin. */
48 txq = sc->tx.txq_map[WME_AC_BE];
49 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
50 qi.tqi_aifs = qi_be.tqi_aifs;
51 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
52 qi.tqi_cwmax = qi_be.tqi_cwmax;
53 }
54
55 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
56 ath_err(common,
57 "Unable to update h/w beacon queue parameters\n");
58 return 0;
59 } else {
60 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
61 return 1;
62 }
63}
64
65/*
66 * Associates the beacon frame buffer with a transmit descriptor. Will set
67 * up rate codes, and channel flags. Beacons are always sent out at the
68 * lowest rate, and are not retried.
69*/
70static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
71 struct ath_buf *bf, int rateidx)
72{
73 struct sk_buff *skb = bf->bf_mpdu;
74 struct ath_hw *ah = sc->sc_ah;
75 struct ath_common *common = ath9k_hw_common(ah);
76 struct ath_desc *ds;
77 struct ath9k_11n_rate_series series[4];
78 int flags, ctsrate = 0, ctsduration = 0;
79 struct ieee80211_supported_band *sband;
80 u8 rate = 0;
81
82 ath9k_reset_beacon_status(sc);
83
84 ds = bf->bf_desc;
85 flags = ATH9K_TXDESC_NOACK;
86
87 ds->ds_link = 0;
88
89 sband = &sc->sbands[common->hw->conf.channel->band];
90 rate = sband->bitrates[rateidx].hw_value;
91 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
92 rate |= sband->bitrates[rateidx].hw_value_short;
93
94 ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
95 ATH9K_PKT_TYPE_BEACON,
96 MAX_RATE_POWER,
97 ATH9K_TXKEYIX_INVALID,
98 ATH9K_KEY_TYPE_CLEAR,
99 flags);
100
101 /* NB: beacon's BufLen must be a multiple of 4 bytes */
102 ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
103 true, true, ds, bf->bf_buf_addr,
104 sc->beacon.beaconq);
105
106 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
107 series[0].Tries = 1;
108 series[0].Rate = rate;
109 series[0].ChSel = ath_txchainmask_reduction(sc,
110 common->tx_chainmask, series[0].Rate);
111 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
112 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
113 series, 4, 0);
114}
115
116static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
117{
118 struct ath_softc *sc = hw->priv;
119 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
120 struct ath_tx_control txctl;
121
122 memset(&txctl, 0, sizeof(struct ath_tx_control));
123 txctl.txq = sc->beacon.cabq;
124
125 ath_dbg(common, ATH_DBG_XMIT,
126 "transmitting CABQ packet, skb: %p\n", skb);
127
128 if (ath_tx_start(hw, skb, &txctl) != 0) {
129 ath_dbg(common, ATH_DBG_XMIT, "CABQ TX failed\n");
130 dev_kfree_skb_any(skb);
131 }
132}
133
134static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
135 struct ieee80211_vif *vif)
136{
137 struct ath_softc *sc = hw->priv;
138 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
139 struct ath_buf *bf;
140 struct ath_vif *avp;
141 struct sk_buff *skb;
142 struct ath_txq *cabq;
143 struct ieee80211_tx_info *info;
144 int cabq_depth;
145
146 ath9k_reset_beacon_status(sc);
147
148 avp = (void *)vif->drv_priv;
149 cabq = sc->beacon.cabq;
150
151 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
152 return NULL;
153
154 /* Release the old beacon first */
155
156 bf = avp->av_bcbuf;
157 skb = bf->bf_mpdu;
158 if (skb) {
159 dma_unmap_single(sc->dev, bf->bf_buf_addr,
160 skb->len, DMA_TO_DEVICE);
161 dev_kfree_skb_any(skb);
162 bf->bf_buf_addr = 0;
163 }
164
165 /* Get a new beacon from mac80211 */
166
167 skb = ieee80211_beacon_get(hw, vif);
168 bf->bf_mpdu = skb;
169 if (skb == NULL)
170 return NULL;
171 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
172 avp->tsf_adjust;
173
174 info = IEEE80211_SKB_CB(skb);
175 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
176 /*
177 * TODO: make sure the seq# gets assigned properly (vs. other
178 * TX frames)
179 */
180 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
181 sc->tx.seq_no += 0x10;
182 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
183 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
184 }
185
186 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
187 skb->len, DMA_TO_DEVICE);
188 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
189 dev_kfree_skb_any(skb);
190 bf->bf_mpdu = NULL;
191 bf->bf_buf_addr = 0;
192 ath_err(common, "dma_mapping_error on beaconing\n");
193 return NULL;
194 }
195
196 skb = ieee80211_get_buffered_bc(hw, vif);
197
198 /*
199 * if the CABQ traffic from previous DTIM is pending and the current
200 * beacon is also a DTIM.
201 * 1) if there is only one vif let the cab traffic continue.
202 * 2) if there are more than one vif and we are using staggered
203 * beacons, then drain the cabq by dropping all the frames in
204 * the cabq so that the current vifs cab traffic can be scheduled.
205 */
206 spin_lock_bh(&cabq->axq_lock);
207 cabq_depth = cabq->axq_depth;
208 spin_unlock_bh(&cabq->axq_lock);
209
210 if (skb && cabq_depth) {
211 if (sc->nvifs > 1) {
212 ath_dbg(common, ATH_DBG_BEACON,
213 "Flushing previous cabq traffic\n");
214 ath_draintxq(sc, cabq, false);
215 }
216 }
217
218 ath_beacon_setup(sc, avp, bf, info->control.rates[0].idx);
219
220 while (skb) {
221 ath_tx_cabq(hw, skb);
222 skb = ieee80211_get_buffered_bc(hw, vif);
223 }
224
225 return bf;
226}
227
228int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
229{
230 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
231 struct ath_vif *avp;
232 struct ath_buf *bf;
233 struct sk_buff *skb;
234 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
235 __le64 tstamp;
236
237 avp = (void *)vif->drv_priv;
238
239 /* Allocate a beacon descriptor if we haven't done so. */
240 if (!avp->av_bcbuf) {
241 /* Allocate beacon state for hostap/ibss. We know
242 * a buffer is available. */
243 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
244 struct ath_buf, list);
245 list_del(&avp->av_bcbuf->list);
246
247 if (ath9k_uses_beacons(vif->type)) {
248 int slot;
249 /*
250 * Assign the vif to a beacon xmit slot. As
251 * above, this cannot fail to find one.
252 */
253 avp->av_bslot = 0;
254 for (slot = 0; slot < ATH_BCBUF; slot++)
255 if (sc->beacon.bslot[slot] == NULL) {
256 avp->av_bslot = slot;
257 avp->is_bslot_active = false;
258
259 /* NB: keep looking for a double slot */
260 if (slot == 0 || !sc->beacon.bslot[slot-1])
261 break;
262 }
263 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
264 sc->beacon.bslot[avp->av_bslot] = vif;
265 sc->nbcnvifs++;
266 }
267 }
268
269 /* release the previous beacon frame, if it already exists. */
270 bf = avp->av_bcbuf;
271 if (bf->bf_mpdu != NULL) {
272 skb = bf->bf_mpdu;
273 dma_unmap_single(sc->dev, bf->bf_buf_addr,
274 skb->len, DMA_TO_DEVICE);
275 dev_kfree_skb_any(skb);
276 bf->bf_mpdu = NULL;
277 bf->bf_buf_addr = 0;
278 }
279
280 /* NB: the beacon data buffer must be 32-bit aligned. */
281 skb = ieee80211_beacon_get(sc->hw, vif);
282 if (skb == NULL)
283 return -ENOMEM;
284
285 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
286 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
287 /* Calculate a TSF adjustment factor required for staggered beacons. */
288 if (avp->av_bslot > 0) {
289 u64 tsfadjust;
290 int intval;
291
292 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
293
294 /*
295 * Calculate the TSF offset for this beacon slot, i.e., the
296 * number of usecs that need to be added to the timestamp field
297 * in Beacon and Probe Response frames. Beacon slot 0 is
298 * processed at the correct offset, so it does not require TSF
299 * adjustment. Other slots are adjusted to get the timestamp
300 * close to the TBTT for the BSS.
301 */
302 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
303 avp->tsf_adjust = cpu_to_le64(tsfadjust);
304
305 ath_dbg(common, ATH_DBG_BEACON,
306 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
307 avp->av_bslot, intval, (unsigned long long)tsfadjust);
308
309 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
310 avp->tsf_adjust;
311 } else
312 avp->tsf_adjust = cpu_to_le64(0);
313
314 bf->bf_mpdu = skb;
315 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
316 skb->len, DMA_TO_DEVICE);
317 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
318 dev_kfree_skb_any(skb);
319 bf->bf_mpdu = NULL;
320 bf->bf_buf_addr = 0;
321 ath_err(common, "dma_mapping_error on beacon alloc\n");
322 return -ENOMEM;
323 }
324 avp->is_bslot_active = true;
325
326 return 0;
327}
328
329void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
330{
331 if (avp->av_bcbuf != NULL) {
332 struct ath_buf *bf;
333
334 avp->is_bslot_active = false;
335 if (avp->av_bslot != -1) {
336 sc->beacon.bslot[avp->av_bslot] = NULL;
337 sc->nbcnvifs--;
338 avp->av_bslot = -1;
339 }
340
341 bf = avp->av_bcbuf;
342 if (bf->bf_mpdu != NULL) {
343 struct sk_buff *skb = bf->bf_mpdu;
344 dma_unmap_single(sc->dev, bf->bf_buf_addr,
345 skb->len, DMA_TO_DEVICE);
346 dev_kfree_skb_any(skb);
347 bf->bf_mpdu = NULL;
348 bf->bf_buf_addr = 0;
349 }
350 list_add_tail(&bf->list, &sc->beacon.bbuf);
351
352 avp->av_bcbuf = NULL;
353 }
354}
355
356void ath_beacon_tasklet(unsigned long data)
357{
358 struct ath_softc *sc = (struct ath_softc *)data;
359 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
360 struct ath_hw *ah = sc->sc_ah;
361 struct ath_common *common = ath9k_hw_common(ah);
362 struct ath_buf *bf = NULL;
363 struct ieee80211_vif *vif;
364 struct ath_tx_status ts;
365 int slot;
366 u32 bfaddr, bc = 0;
367
368 /*
369 * Check if the previous beacon has gone out. If
370 * not don't try to post another, skip this period
371 * and wait for the next. Missed beacons indicate
372 * a problem and should not occur. If we miss too
373 * many consecutive beacons reset the device.
374 */
375 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
376 sc->beacon.bmisscnt++;
377
378 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
379 ath_dbg(common, ATH_DBG_BSTUCK,
380 "missed %u consecutive beacons\n",
381 sc->beacon.bmisscnt);
382 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
383 if (sc->beacon.bmisscnt > 3)
384 ath9k_hw_bstuck_nfcal(ah);
385 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
386 ath_dbg(common, ATH_DBG_BSTUCK,
387 "beacon is officially stuck\n");
388 sc->sc_flags |= SC_OP_TSF_RESET;
389 spin_lock(&sc->sc_pcu_lock);
390 ath_reset(sc, true);
391 spin_unlock(&sc->sc_pcu_lock);
392 }
393
394 return;
395 }
396
397 /*
398 * Generate beacon frames. we are sending frames
399 * staggered so calculate the slot for this frame based
400 * on the tsf to safeguard against missing an swba.
401 */
402
403
404 if (ah->opmode == NL80211_IFTYPE_AP) {
405 u16 intval;
406 u32 tsftu;
407 u64 tsf;
408
409 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
410 tsf = ath9k_hw_gettsf64(ah);
411 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
412 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
413 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
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 / ATH_BCBUF, intval, vif);
419 } else {
420 slot = 0;
421 vif = sc->beacon.bslot[slot];
422 }
423
424
425 bfaddr = 0;
426 if (vif) {
427 bf = ath_beacon_generate(sc->hw, vif);
428 if (bf != NULL) {
429 bfaddr = bf->bf_daddr;
430 bc = 1;
431 }
432
433 if (sc->beacon.bmisscnt != 0) {
434 ath_dbg(common, ATH_DBG_BSTUCK,
435 "resume beacon xmit after %u misses\n",
436 sc->beacon.bmisscnt);
437 sc->beacon.bmisscnt = 0;
438 }
439 }
440
441 /*
442 * Handle slot time change when a non-ERP station joins/leaves
443 * an 11g network. The 802.11 layer notifies us via callback,
444 * we mark updateslot, then wait one beacon before effecting
445 * the change. This gives associated stations at least one
446 * beacon interval to note the state change.
447 *
448 * NB: The slot time change state machine is clocked according
449 * to whether we are bursting or staggering beacons. We
450 * recognize the request to update and record the current
451 * slot then don't transition until that slot is reached
452 * again. If we miss a beacon for that slot then we'll be
453 * slow to transition but we'll be sure at least one beacon
454 * interval has passed. When bursting slot is always left
455 * set to ATH_BCBUF so this check is a noop.
456 */
457 if (sc->beacon.updateslot == UPDATE) {
458 sc->beacon.updateslot = COMMIT; /* commit next beacon */
459 sc->beacon.slotupdate = slot;
460 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
461 ah->slottime = sc->beacon.slottime;
462 ath9k_hw_init_global_settings(ah);
463 sc->beacon.updateslot = OK;
464 }
465 if (bfaddr != 0) {
466 /* NB: cabq traffic should already be queued and primed */
467 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
468 ath9k_hw_txstart(ah, sc->beacon.beaconq);
469
470 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
471 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
472 spin_lock_bh(&sc->sc_pcu_lock);
473 ath9k_hw_txprocdesc(ah, bf->bf_desc, (void *)&ts);
474 spin_unlock_bh(&sc->sc_pcu_lock);
475 }
476 }
477}
478
479static void ath9k_beacon_init(struct ath_softc *sc,
480 u32 next_beacon,
481 u32 beacon_period)
482{
483 if (sc->sc_flags & SC_OP_TSF_RESET) {
484 ath9k_ps_wakeup(sc);
485 ath9k_hw_reset_tsf(sc->sc_ah);
486 }
487
488 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
489
490 if (sc->sc_flags & SC_OP_TSF_RESET) {
491 ath9k_ps_restore(sc);
492 sc->sc_flags &= ~SC_OP_TSF_RESET;
493 }
494}
495
496/*
497 * For multi-bss ap support beacons are either staggered evenly over N slots or
498 * burst together. For the former arrange for the SWBA to be delivered for each
499 * slot. Slots that are not occupied will generate nothing.
500 */
501static void ath_beacon_config_ap(struct ath_softc *sc,
502 struct ath_beacon_config *conf)
503{
504 struct ath_hw *ah = sc->sc_ah;
505 u32 nexttbtt, intval;
506
507 /* NB: the beacon interval is kept internally in TU's */
508 intval = TU_TO_USEC(conf->beacon_interval);
509 intval /= ATH_BCBUF; /* for staggered beacons */
510 nexttbtt = intval;
511
512 /*
513 * In AP mode we enable the beacon timers and SWBA interrupts to
514 * prepare beacon frames.
515 */
516 ah->imask |= ATH9K_INT_SWBA;
517 ath_beaconq_config(sc);
518
519 /* Set the computed AP beacon timers */
520
521 ath9k_hw_disable_interrupts(ah);
522 ath9k_beacon_init(sc, nexttbtt, intval);
523 sc->beacon.bmisscnt = 0;
524 ath9k_hw_set_interrupts(ah, ah->imask);
525}
526
527/*
528 * This sets up the beacon timers according to the timestamp of the last
529 * received beacon and the current TSF, configures PCF and DTIM
530 * handling, programs the sleep registers so the hardware will wakeup in
531 * time to receive beacons, and configures the beacon miss handling so
532 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
533 * we've associated with.
534 */
535static void ath_beacon_config_sta(struct ath_softc *sc,
536 struct ath_beacon_config *conf)
537{
538 struct ath_hw *ah = sc->sc_ah;
539 struct ath_common *common = ath9k_hw_common(ah);
540 struct ath9k_beacon_state bs;
541 int dtimperiod, dtimcount, sleepduration;
542 int cfpperiod, cfpcount;
543 u32 nexttbtt = 0, intval, tsftu;
544 u64 tsf;
545 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
546
547 /* No need to configure beacon if we are not associated */
548 if (!common->curaid) {
549 ath_dbg(common, ATH_DBG_BEACON,
550 "STA is not yet associated..skipping beacon config\n");
551 return;
552 }
553
554 memset(&bs, 0, sizeof(bs));
555 intval = conf->beacon_interval;
556
557 /*
558 * Setup dtim and cfp parameters according to
559 * last beacon we received (which may be none).
560 */
561 dtimperiod = conf->dtim_period;
562 dtimcount = conf->dtim_count;
563 if (dtimcount >= dtimperiod) /* NB: sanity check */
564 dtimcount = 0;
565 cfpperiod = 1; /* NB: no PCF support yet */
566 cfpcount = 0;
567
568 sleepduration = conf->listen_interval * intval;
569
570 /*
571 * Pull nexttbtt forward to reflect the current
572 * TSF and calculate dtim+cfp state for the result.
573 */
574 tsf = ath9k_hw_gettsf64(ah);
575 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
576
577 num_beacons = tsftu / intval + 1;
578 offset = tsftu % intval;
579 nexttbtt = tsftu - offset;
580 if (offset)
581 nexttbtt += intval;
582
583 /* DTIM Beacon every dtimperiod Beacon */
584 dtim_dec_count = num_beacons % dtimperiod;
585 /* CFP every cfpperiod DTIM Beacon */
586 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
587 if (dtim_dec_count)
588 cfp_dec_count++;
589
590 dtimcount -= dtim_dec_count;
591 if (dtimcount < 0)
592 dtimcount += dtimperiod;
593
594 cfpcount -= cfp_dec_count;
595 if (cfpcount < 0)
596 cfpcount += cfpperiod;
597
598 bs.bs_intval = intval;
599 bs.bs_nexttbtt = nexttbtt;
600 bs.bs_dtimperiod = dtimperiod*intval;
601 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
602 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
603 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
604 bs.bs_cfpmaxduration = 0;
605
606 /*
607 * Calculate the number of consecutive beacons to miss* before taking
608 * a BMISS interrupt. The configuration is specified in TU so we only
609 * need calculate based on the beacon interval. Note that we clamp the
610 * result to at most 15 beacons.
611 */
612 if (sleepduration > intval) {
613 bs.bs_bmissthreshold = conf->listen_interval *
614 ATH_DEFAULT_BMISS_LIMIT / 2;
615 } else {
616 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
617 if (bs.bs_bmissthreshold > 15)
618 bs.bs_bmissthreshold = 15;
619 else if (bs.bs_bmissthreshold <= 0)
620 bs.bs_bmissthreshold = 1;
621 }
622
623 /*
624 * Calculate sleep duration. The configuration is given in ms.
625 * We ensure a multiple of the beacon period is used. Also, if the sleep
626 * duration is greater than the DTIM period then it makes senses
627 * to make it a multiple of that.
628 *
629 * XXX fixed at 100ms
630 */
631
632 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
633 if (bs.bs_sleepduration > bs.bs_dtimperiod)
634 bs.bs_sleepduration = bs.bs_dtimperiod;
635
636 /* TSF out of range threshold fixed at 1 second */
637 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
638
639 ath_dbg(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
640 ath_dbg(common, ATH_DBG_BEACON,
641 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
642 bs.bs_bmissthreshold, bs.bs_sleepduration,
643 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
644
645 /* Set the computed STA beacon timers */
646
647 ath9k_hw_disable_interrupts(ah);
648 ath9k_hw_set_sta_beacon_timers(ah, &bs);
649 ah->imask |= ATH9K_INT_BMISS;
650
651 /*
652 * If the beacon config is called beacause of TSFOOR,
653 * Interrupts will be enabled back at the end of ath9k_tasklet
654 */
655 if (!(sc->ps_flags & PS_TSFOOR_SYNC))
656 ath9k_hw_set_interrupts(ah, ah->imask);
657}
658
659static void ath_beacon_config_adhoc(struct ath_softc *sc,
660 struct ath_beacon_config *conf)
661{
662 struct ath_hw *ah = sc->sc_ah;
663 struct ath_common *common = ath9k_hw_common(ah);
664 u32 tsf, intval, nexttbtt;
665
666 ath9k_reset_beacon_status(sc);
667
668 intval = TU_TO_USEC(conf->beacon_interval);
669 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
670 nexttbtt = tsf + intval;
671
672 ath_dbg(common, ATH_DBG_BEACON,
673 "IBSS nexttbtt %u intval %u (%u)\n",
674 nexttbtt, intval, conf->beacon_interval);
675
676 /*
677 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
678 * if we need to manually prepare beacon frames. Otherwise we use a
679 * self-linked tx descriptor and let the hardware deal with things.
680 */
681 ah->imask |= ATH9K_INT_SWBA;
682
683 ath_beaconq_config(sc);
684
685 /* Set the computed ADHOC beacon timers */
686
687 ath9k_hw_disable_interrupts(ah);
688 ath9k_beacon_init(sc, nexttbtt, intval);
689 sc->beacon.bmisscnt = 0;
690 /*
691 * If the beacon config is called beacause of TSFOOR,
692 * Interrupts will be enabled back at the end of ath9k_tasklet
693 */
694 if (!(sc->ps_flags & PS_TSFOOR_SYNC))
695 ath9k_hw_set_interrupts(ah, ah->imask);
696}
697
698static bool ath9k_allow_beacon_config(struct ath_softc *sc,
699 struct ieee80211_vif *vif)
700{
701 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
702 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
703 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
704 struct ath_vif *avp = (void *)vif->drv_priv;
705
706 /*
707 * Can not have different beacon interval on multiple
708 * AP interface case
709 */
710 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
711 (sc->nbcnvifs > 1) &&
712 (vif->type == NL80211_IFTYPE_AP) &&
713 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
714 ath_dbg(common, ATH_DBG_CONFIG,
715 "Changing beacon interval of multiple \
716 AP interfaces !\n");
717 return false;
718 }
719 /*
720 * Can not configure station vif's beacon config
721 * while on AP opmode
722 */
723 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
724 (vif->type != NL80211_IFTYPE_AP)) {
725 ath_dbg(common, ATH_DBG_CONFIG,
726 "STA vif's beacon not allowed on AP mode\n");
727 return false;
728 }
729 /*
730 * Do not allow beacon config if HW was already configured
731 * with another STA vif
732 */
733 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
734 (vif->type == NL80211_IFTYPE_STATION) &&
735 (sc->sc_flags & SC_OP_BEACONS) &&
736 !avp->primary_sta_vif) {
737 ath_dbg(common, ATH_DBG_CONFIG,
738 "Beacon already configured for a station interface\n");
739 return false;
740 }
741 return true;
742}
743
744void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
745{
746 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
747 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
748
749 if (!ath9k_allow_beacon_config(sc, vif))
750 return;
751
752 /* Setup the beacon configuration parameters */
753 cur_conf->beacon_interval = bss_conf->beacon_int;
754 cur_conf->dtim_period = bss_conf->dtim_period;
755 cur_conf->listen_interval = 1;
756 cur_conf->dtim_count = 1;
757 cur_conf->bmiss_timeout =
758 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
759
760 /*
761 * It looks like mac80211 may end up using beacon interval of zero in
762 * some cases (at least for mesh point). Avoid getting into an
763 * infinite loop by using a bit safer value instead. To be safe,
764 * do sanity check on beacon interval for all operating modes.
765 */
766 if (cur_conf->beacon_interval == 0)
767 cur_conf->beacon_interval = 100;
768
769 /*
770 * We don't parse dtim period from mac80211 during the driver
771 * initialization as it breaks association with hidden-ssid
772 * AP and it causes latency in roaming
773 */
774 if (cur_conf->dtim_period == 0)
775 cur_conf->dtim_period = 1;
776
777 ath_set_beacon(sc);
778}
779
780static bool ath_has_valid_bslot(struct ath_softc *sc)
781{
782 struct ath_vif *avp;
783 int slot;
784 bool found = false;
785
786 for (slot = 0; slot < ATH_BCBUF; slot++) {
787 if (sc->beacon.bslot[slot]) {
788 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
789 if (avp->is_bslot_active) {
790 found = true;
791 break;
792 }
793 }
794 }
795 return found;
796}
797
798
799void ath_set_beacon(struct ath_softc *sc)
800{
801 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
802 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
803
804 switch (sc->sc_ah->opmode) {
805 case NL80211_IFTYPE_AP:
806 if (ath_has_valid_bslot(sc))
807 ath_beacon_config_ap(sc, cur_conf);
808 break;
809 case NL80211_IFTYPE_ADHOC:
810 case NL80211_IFTYPE_MESH_POINT:
811 ath_beacon_config_adhoc(sc, cur_conf);
812 break;
813 case NL80211_IFTYPE_STATION:
814 ath_beacon_config_sta(sc, cur_conf);
815 break;
816 default:
817 ath_dbg(common, ATH_DBG_CONFIG,
818 "Unsupported beaconing mode\n");
819 return;
820 }
821
822 sc->sc_flags |= SC_OP_BEACONS;
823}
824
825void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
826{
827 struct ath_hw *ah = sc->sc_ah;
828
829 if (!ath_has_valid_bslot(sc))
830 return;
831
832 ath9k_ps_wakeup(sc);
833 if (status) {
834 /* Re-enable beaconing */
835 ah->imask |= ATH9K_INT_SWBA;
836 ath9k_hw_set_interrupts(ah, ah->imask);
837 } else {
838 /* Disable SWBA interrupt */
839 ah->imask &= ~ATH9K_INT_SWBA;
840 ath9k_hw_set_interrupts(ah, ah->imask);
841 tasklet_kill(&sc->bcon_tasklet);
842 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
843 }
844 ath9k_ps_restore(sc);
845}
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*/
33int ath_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 if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
42 /* Always burst out beacon and CAB traffic. */
43 qi.tqi_aifs = 1;
44 qi.tqi_cwmin = 0;
45 qi.tqi_cwmax = 0;
46 } else {
47 /* Adhoc mode; important thing is to use 2x cwmin. */
48 txq = sc->tx.txq_map[WME_AC_BE];
49 ath9k_hw_get_txq_props(ah, txq->axq_qnum, &qi_be);
50 qi.tqi_aifs = qi_be.tqi_aifs;
51 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
52 qi.tqi_cwmax = qi_be.tqi_cwmax;
53 }
54
55 if (!ath9k_hw_set_txq_props(ah, sc->beacon.beaconq, &qi)) {
56 ath_err(common,
57 "Unable to update h/w beacon queue parameters\n");
58 return 0;
59 } else {
60 ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
61 return 1;
62 }
63}
64
65/*
66 * Associates the beacon frame buffer with a transmit descriptor. Will set
67 * up rate codes, and channel flags. Beacons are always sent out at the
68 * lowest rate, and are not retried.
69*/
70static void ath_beacon_setup(struct ath_softc *sc, struct ieee80211_vif *vif,
71 struct ath_buf *bf, int rateidx)
72{
73 struct sk_buff *skb = bf->bf_mpdu;
74 struct ath_hw *ah = sc->sc_ah;
75 struct ath_common *common = ath9k_hw_common(ah);
76 struct ath_tx_info info;
77 struct ieee80211_supported_band *sband;
78 u8 chainmask = ah->txchainmask;
79 u8 rate = 0;
80
81 ath9k_reset_beacon_status(sc);
82
83 sband = &sc->sbands[common->hw->conf.channel->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 info.txpower = MAX_RATE_POWER;
92 info.keyix = ATH9K_TXKEYIX_INVALID;
93 info.keytype = ATH9K_KEY_TYPE_CLEAR;
94 info.flags = ATH9K_TXDESC_NOACK | ATH9K_TXDESC_CLRDMASK;
95
96 info.buf_addr[0] = bf->bf_buf_addr;
97 info.buf_len[0] = roundup(skb->len, 4);
98
99 info.is_first = true;
100 info.is_last = true;
101
102 info.qcu = sc->beacon.beaconq;
103
104 info.rates[0].Tries = 1;
105 info.rates[0].Rate = rate;
106 info.rates[0].ChSel = ath_txchainmask_reduction(sc, chainmask, rate);
107
108 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
109}
110
111static void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
112{
113 struct ath_softc *sc = hw->priv;
114 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
115 struct ath_tx_control txctl;
116
117 memset(&txctl, 0, sizeof(struct ath_tx_control));
118 txctl.txq = sc->beacon.cabq;
119
120 ath_dbg(common, XMIT, "transmitting CABQ packet, skb: %p\n", skb);
121
122 if (ath_tx_start(hw, skb, &txctl) != 0) {
123 ath_dbg(common, XMIT, "CABQ TX failed\n");
124 dev_kfree_skb_any(skb);
125 }
126}
127
128static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
129 struct ieee80211_vif *vif)
130{
131 struct ath_softc *sc = hw->priv;
132 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
133 struct ath_buf *bf;
134 struct ath_vif *avp;
135 struct sk_buff *skb;
136 struct ath_txq *cabq;
137 struct ieee80211_tx_info *info;
138 int cabq_depth;
139
140 ath9k_reset_beacon_status(sc);
141
142 avp = (void *)vif->drv_priv;
143 cabq = sc->beacon.cabq;
144
145 if ((avp->av_bcbuf == NULL) || !avp->is_bslot_active)
146 return NULL;
147
148 /* Release the old beacon first */
149
150 bf = avp->av_bcbuf;
151 skb = bf->bf_mpdu;
152 if (skb) {
153 dma_unmap_single(sc->dev, bf->bf_buf_addr,
154 skb->len, DMA_TO_DEVICE);
155 dev_kfree_skb_any(skb);
156 bf->bf_buf_addr = 0;
157 }
158
159 /* Get a new beacon from mac80211 */
160
161 skb = ieee80211_beacon_get(hw, vif);
162 bf->bf_mpdu = skb;
163 if (skb == NULL)
164 return NULL;
165 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
166 avp->tsf_adjust;
167
168 info = IEEE80211_SKB_CB(skb);
169 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
170 /*
171 * TODO: make sure the seq# gets assigned properly (vs. other
172 * TX frames)
173 */
174 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
175 sc->tx.seq_no += 0x10;
176 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
177 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
178 }
179
180 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
181 skb->len, DMA_TO_DEVICE);
182 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
183 dev_kfree_skb_any(skb);
184 bf->bf_mpdu = NULL;
185 bf->bf_buf_addr = 0;
186 ath_err(common, "dma_mapping_error on beaconing\n");
187 return NULL;
188 }
189
190 skb = ieee80211_get_buffered_bc(hw, vif);
191
192 /*
193 * if the CABQ traffic from previous DTIM is pending and the current
194 * beacon is also a DTIM.
195 * 1) if there is only one vif let the cab traffic continue.
196 * 2) if there are more than one vif and we are using staggered
197 * beacons, then drain the cabq by dropping all the frames in
198 * the cabq so that the current vifs cab traffic can be scheduled.
199 */
200 spin_lock_bh(&cabq->axq_lock);
201 cabq_depth = cabq->axq_depth;
202 spin_unlock_bh(&cabq->axq_lock);
203
204 if (skb && cabq_depth) {
205 if (sc->nvifs > 1) {
206 ath_dbg(common, BEACON,
207 "Flushing previous cabq traffic\n");
208 ath_draintxq(sc, cabq, false);
209 }
210 }
211
212 ath_beacon_setup(sc, vif, bf, info->control.rates[0].idx);
213
214 while (skb) {
215 ath_tx_cabq(hw, skb);
216 skb = ieee80211_get_buffered_bc(hw, vif);
217 }
218
219 return bf;
220}
221
222int ath_beacon_alloc(struct ath_softc *sc, struct ieee80211_vif *vif)
223{
224 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
225 struct ath_vif *avp;
226 struct ath_buf *bf;
227 struct sk_buff *skb;
228 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
229 __le64 tstamp;
230
231 avp = (void *)vif->drv_priv;
232
233 /* Allocate a beacon descriptor if we haven't done so. */
234 if (!avp->av_bcbuf) {
235 /* Allocate beacon state for hostap/ibss. We know
236 * a buffer is available. */
237 avp->av_bcbuf = list_first_entry(&sc->beacon.bbuf,
238 struct ath_buf, list);
239 list_del(&avp->av_bcbuf->list);
240
241 if (ath9k_uses_beacons(vif->type)) {
242 int slot;
243 /*
244 * Assign the vif to a beacon xmit slot. As
245 * above, this cannot fail to find one.
246 */
247 avp->av_bslot = 0;
248 for (slot = 0; slot < ATH_BCBUF; slot++)
249 if (sc->beacon.bslot[slot] == NULL) {
250 avp->av_bslot = slot;
251 avp->is_bslot_active = false;
252
253 /* NB: keep looking for a double slot */
254 if (slot == 0 || !sc->beacon.bslot[slot-1])
255 break;
256 }
257 BUG_ON(sc->beacon.bslot[avp->av_bslot] != NULL);
258 sc->beacon.bslot[avp->av_bslot] = vif;
259 sc->nbcnvifs++;
260 }
261 }
262
263 /* release the previous beacon frame, if it already exists. */
264 bf = avp->av_bcbuf;
265 if (bf->bf_mpdu != NULL) {
266 skb = bf->bf_mpdu;
267 dma_unmap_single(sc->dev, bf->bf_buf_addr,
268 skb->len, DMA_TO_DEVICE);
269 dev_kfree_skb_any(skb);
270 bf->bf_mpdu = NULL;
271 bf->bf_buf_addr = 0;
272 }
273
274 /* NB: the beacon data buffer must be 32-bit aligned. */
275 skb = ieee80211_beacon_get(sc->hw, vif);
276 if (skb == NULL)
277 return -ENOMEM;
278
279 tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
280 sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
281 /* Calculate a TSF adjustment factor required for staggered beacons. */
282 if (avp->av_bslot > 0) {
283 u64 tsfadjust;
284 int intval;
285
286 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
287
288 /*
289 * Calculate the TSF offset for this beacon slot, i.e., the
290 * number of usecs that need to be added to the timestamp field
291 * in Beacon and Probe Response frames. Beacon slot 0 is
292 * processed at the correct offset, so it does not require TSF
293 * adjustment. Other slots are adjusted to get the timestamp
294 * close to the TBTT for the BSS.
295 */
296 tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
297 avp->tsf_adjust = cpu_to_le64(tsfadjust);
298
299 ath_dbg(common, BEACON,
300 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
301 avp->av_bslot, intval, (unsigned long long)tsfadjust);
302
303 ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp =
304 avp->tsf_adjust;
305 } else
306 avp->tsf_adjust = cpu_to_le64(0);
307
308 bf->bf_mpdu = skb;
309 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
310 skb->len, DMA_TO_DEVICE);
311 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
312 dev_kfree_skb_any(skb);
313 bf->bf_mpdu = NULL;
314 bf->bf_buf_addr = 0;
315 ath_err(common, "dma_mapping_error on beacon alloc\n");
316 return -ENOMEM;
317 }
318 avp->is_bslot_active = true;
319
320 return 0;
321}
322
323void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
324{
325 if (avp->av_bcbuf != NULL) {
326 struct ath_buf *bf;
327
328 avp->is_bslot_active = false;
329 if (avp->av_bslot != -1) {
330 sc->beacon.bslot[avp->av_bslot] = NULL;
331 sc->nbcnvifs--;
332 avp->av_bslot = -1;
333 }
334
335 bf = avp->av_bcbuf;
336 if (bf->bf_mpdu != NULL) {
337 struct sk_buff *skb = bf->bf_mpdu;
338 dma_unmap_single(sc->dev, bf->bf_buf_addr,
339 skb->len, DMA_TO_DEVICE);
340 dev_kfree_skb_any(skb);
341 bf->bf_mpdu = NULL;
342 bf->bf_buf_addr = 0;
343 }
344 list_add_tail(&bf->list, &sc->beacon.bbuf);
345
346 avp->av_bcbuf = NULL;
347 }
348}
349
350void ath_beacon_tasklet(unsigned long data)
351{
352 struct ath_softc *sc = (struct ath_softc *)data;
353 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
354 struct ath_hw *ah = sc->sc_ah;
355 struct ath_common *common = ath9k_hw_common(ah);
356 struct ath_buf *bf = NULL;
357 struct ieee80211_vif *vif;
358 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
359 int slot;
360 u32 bfaddr, bc = 0;
361
362 if (work_pending(&sc->hw_reset_work)) {
363 ath_dbg(common, RESET,
364 "reset work is pending, skip beaconing now\n");
365 return;
366 }
367 /*
368 * Check if the previous beacon has gone out. If
369 * not don't try to post another, skip this period
370 * and wait for the next. Missed beacons indicate
371 * a problem and should not occur. If we miss too
372 * many consecutive beacons reset the device.
373 */
374 if (ath9k_hw_numtxpending(ah, sc->beacon.beaconq) != 0) {
375 sc->beacon.bmisscnt++;
376
377 if (!ath9k_hw_check_alive(ah))
378 ieee80211_queue_work(sc->hw, &sc->hw_check_work);
379
380 if (sc->beacon.bmisscnt < BSTUCK_THRESH * sc->nbcnvifs) {
381 ath_dbg(common, BSTUCK,
382 "missed %u consecutive beacons\n",
383 sc->beacon.bmisscnt);
384 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
385 if (sc->beacon.bmisscnt > 3)
386 ath9k_hw_bstuck_nfcal(ah);
387 } else if (sc->beacon.bmisscnt >= BSTUCK_THRESH) {
388 ath_dbg(common, BSTUCK, "beacon is officially stuck\n");
389 sc->beacon.bmisscnt = 0;
390 sc->sc_flags |= SC_OP_TSF_RESET;
391 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
392 }
393
394 return;
395 }
396
397 /*
398 * Generate beacon frames. we are sending frames
399 * staggered so calculate the slot for this frame based
400 * on the tsf to safeguard against missing an swba.
401 */
402
403
404 if (ah->opmode == NL80211_IFTYPE_AP) {
405 u16 intval;
406 u32 tsftu;
407 u64 tsf;
408
409 intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
410 tsf = ath9k_hw_gettsf64(ah);
411 tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
412 tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
413 slot = (tsftu % (intval * ATH_BCBUF)) / intval;
414 vif = sc->beacon.bslot[slot];
415
416 ath_dbg(common, BEACON,
417 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
418 slot, tsf, tsftu / ATH_BCBUF, intval, vif);
419 } else {
420 slot = 0;
421 vif = sc->beacon.bslot[slot];
422 }
423
424
425 bfaddr = 0;
426 if (vif) {
427 bf = ath_beacon_generate(sc->hw, vif);
428 if (bf != NULL) {
429 bfaddr = bf->bf_daddr;
430 bc = 1;
431 }
432
433 if (sc->beacon.bmisscnt != 0) {
434 ath_dbg(common, BSTUCK,
435 "resume beacon xmit after %u misses\n",
436 sc->beacon.bmisscnt);
437 sc->beacon.bmisscnt = 0;
438 }
439 }
440
441 /*
442 * Handle slot time change when a non-ERP station joins/leaves
443 * an 11g network. The 802.11 layer notifies us via callback,
444 * we mark updateslot, then wait one beacon before effecting
445 * the change. This gives associated stations at least one
446 * beacon interval to note the state change.
447 *
448 * NB: The slot time change state machine is clocked according
449 * to whether we are bursting or staggering beacons. We
450 * recognize the request to update and record the current
451 * slot then don't transition until that slot is reached
452 * again. If we miss a beacon for that slot then we'll be
453 * slow to transition but we'll be sure at least one beacon
454 * interval has passed. When bursting slot is always left
455 * set to ATH_BCBUF so this check is a noop.
456 */
457 if (sc->beacon.updateslot == UPDATE) {
458 sc->beacon.updateslot = COMMIT; /* commit next beacon */
459 sc->beacon.slotupdate = slot;
460 } else if (sc->beacon.updateslot == COMMIT && sc->beacon.slotupdate == slot) {
461 ah->slottime = sc->beacon.slottime;
462 ath9k_hw_init_global_settings(ah);
463 sc->beacon.updateslot = OK;
464 }
465 if (bfaddr != 0) {
466 /* NB: cabq traffic should already be queued and primed */
467 ath9k_hw_puttxbuf(ah, sc->beacon.beaconq, bfaddr);
468
469 if (!edma)
470 ath9k_hw_txstart(ah, sc->beacon.beaconq);
471
472 sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */
473 }
474}
475
476static void ath9k_beacon_init(struct ath_softc *sc,
477 u32 next_beacon,
478 u32 beacon_period)
479{
480 if (sc->sc_flags & SC_OP_TSF_RESET) {
481 ath9k_ps_wakeup(sc);
482 ath9k_hw_reset_tsf(sc->sc_ah);
483 }
484
485 ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
486
487 if (sc->sc_flags & SC_OP_TSF_RESET) {
488 ath9k_ps_restore(sc);
489 sc->sc_flags &= ~SC_OP_TSF_RESET;
490 }
491}
492
493/*
494 * For multi-bss ap support beacons are either staggered evenly over N slots or
495 * burst together. For the former arrange for the SWBA to be delivered for each
496 * slot. Slots that are not occupied will generate nothing.
497 */
498static void ath_beacon_config_ap(struct ath_softc *sc,
499 struct ath_beacon_config *conf)
500{
501 struct ath_hw *ah = sc->sc_ah;
502 u32 nexttbtt, intval;
503
504 /* NB: the beacon interval is kept internally in TU's */
505 intval = TU_TO_USEC(conf->beacon_interval);
506 intval /= ATH_BCBUF; /* for staggered beacons */
507 nexttbtt = intval;
508
509 /*
510 * In AP mode we enable the beacon timers and SWBA interrupts to
511 * prepare beacon frames.
512 */
513 ah->imask |= ATH9K_INT_SWBA;
514 ath_beaconq_config(sc);
515
516 /* Set the computed AP beacon timers */
517
518 ath9k_hw_disable_interrupts(ah);
519 sc->sc_flags |= SC_OP_TSF_RESET;
520 ath9k_beacon_init(sc, nexttbtt, intval);
521 sc->beacon.bmisscnt = 0;
522 ath9k_hw_set_interrupts(ah);
523 ath9k_hw_enable_interrupts(ah);
524}
525
526/*
527 * This sets up the beacon timers according to the timestamp of the last
528 * received beacon and the current TSF, configures PCF and DTIM
529 * handling, programs the sleep registers so the hardware will wakeup in
530 * time to receive beacons, and configures the beacon miss handling so
531 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
532 * we've associated with.
533 */
534static void ath_beacon_config_sta(struct ath_softc *sc,
535 struct ath_beacon_config *conf)
536{
537 struct ath_hw *ah = sc->sc_ah;
538 struct ath_common *common = ath9k_hw_common(ah);
539 struct ath9k_beacon_state bs;
540 int dtimperiod, dtimcount, sleepduration;
541 int cfpperiod, cfpcount;
542 u32 nexttbtt = 0, intval, tsftu;
543 u64 tsf;
544 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
545
546 /* No need to configure beacon if we are not associated */
547 if (!common->curaid) {
548 ath_dbg(common, BEACON,
549 "STA is not yet associated..skipping beacon config\n");
550 return;
551 }
552
553 memset(&bs, 0, sizeof(bs));
554 intval = conf->beacon_interval;
555
556 /*
557 * Setup dtim and cfp parameters according to
558 * last beacon we received (which may be none).
559 */
560 dtimperiod = conf->dtim_period;
561 dtimcount = conf->dtim_count;
562 if (dtimcount >= dtimperiod) /* NB: sanity check */
563 dtimcount = 0;
564 cfpperiod = 1; /* NB: no PCF support yet */
565 cfpcount = 0;
566
567 sleepduration = conf->listen_interval * intval;
568
569 /*
570 * Pull nexttbtt forward to reflect the current
571 * TSF and calculate dtim+cfp state for the result.
572 */
573 tsf = ath9k_hw_gettsf64(ah);
574 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
575
576 num_beacons = tsftu / intval + 1;
577 offset = tsftu % intval;
578 nexttbtt = tsftu - offset;
579 if (offset)
580 nexttbtt += intval;
581
582 /* DTIM Beacon every dtimperiod Beacon */
583 dtim_dec_count = num_beacons % dtimperiod;
584 /* CFP every cfpperiod DTIM Beacon */
585 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
586 if (dtim_dec_count)
587 cfp_dec_count++;
588
589 dtimcount -= dtim_dec_count;
590 if (dtimcount < 0)
591 dtimcount += dtimperiod;
592
593 cfpcount -= cfp_dec_count;
594 if (cfpcount < 0)
595 cfpcount += cfpperiod;
596
597 bs.bs_intval = intval;
598 bs.bs_nexttbtt = nexttbtt;
599 bs.bs_dtimperiod = dtimperiod*intval;
600 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
601 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
602 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
603 bs.bs_cfpmaxduration = 0;
604
605 /*
606 * Calculate the number of consecutive beacons to miss* before taking
607 * a BMISS interrupt. The configuration is specified in TU so we only
608 * need calculate based on the beacon interval. Note that we clamp the
609 * result to at most 15 beacons.
610 */
611 if (sleepduration > intval) {
612 bs.bs_bmissthreshold = conf->listen_interval *
613 ATH_DEFAULT_BMISS_LIMIT / 2;
614 } else {
615 bs.bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, intval);
616 if (bs.bs_bmissthreshold > 15)
617 bs.bs_bmissthreshold = 15;
618 else if (bs.bs_bmissthreshold <= 0)
619 bs.bs_bmissthreshold = 1;
620 }
621
622 /*
623 * Calculate sleep duration. The configuration is given in ms.
624 * We ensure a multiple of the beacon period is used. Also, if the sleep
625 * duration is greater than the DTIM period then it makes senses
626 * to make it a multiple of that.
627 *
628 * XXX fixed at 100ms
629 */
630
631 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
632 if (bs.bs_sleepduration > bs.bs_dtimperiod)
633 bs.bs_sleepduration = bs.bs_dtimperiod;
634
635 /* TSF out of range threshold fixed at 1 second */
636 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
637
638 ath_dbg(common, BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
639 ath_dbg(common, BEACON,
640 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
641 bs.bs_bmissthreshold, bs.bs_sleepduration,
642 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
643
644 /* Set the computed STA beacon timers */
645
646 ath9k_hw_disable_interrupts(ah);
647 ath9k_hw_set_sta_beacon_timers(ah, &bs);
648 ah->imask |= ATH9K_INT_BMISS;
649
650 ath9k_hw_set_interrupts(ah);
651 ath9k_hw_enable_interrupts(ah);
652}
653
654static void ath_beacon_config_adhoc(struct ath_softc *sc,
655 struct ath_beacon_config *conf)
656{
657 struct ath_hw *ah = sc->sc_ah;
658 struct ath_common *common = ath9k_hw_common(ah);
659 u32 tsf, intval, nexttbtt;
660
661 ath9k_reset_beacon_status(sc);
662 if (!(sc->sc_flags & SC_OP_BEACONS))
663 ath9k_hw_settsf64(ah, sc->beacon.bc_tstamp);
664
665 intval = TU_TO_USEC(conf->beacon_interval);
666 tsf = roundup(ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE), intval);
667 nexttbtt = tsf + intval;
668
669 ath_dbg(common, BEACON, "IBSS nexttbtt %u intval %u (%u)\n",
670 nexttbtt, intval, conf->beacon_interval);
671
672 /*
673 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
674 * if we need to manually prepare beacon frames. Otherwise we use a
675 * self-linked tx descriptor and let the hardware deal with things.
676 */
677 ah->imask |= ATH9K_INT_SWBA;
678
679 ath_beaconq_config(sc);
680
681 /* Set the computed ADHOC beacon timers */
682
683 ath9k_hw_disable_interrupts(ah);
684 ath9k_beacon_init(sc, nexttbtt, intval);
685 sc->beacon.bmisscnt = 0;
686
687 ath9k_hw_set_interrupts(ah);
688 ath9k_hw_enable_interrupts(ah);
689}
690
691static bool ath9k_allow_beacon_config(struct ath_softc *sc,
692 struct ieee80211_vif *vif)
693{
694 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
695 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
696 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
697 struct ath_vif *avp = (void *)vif->drv_priv;
698
699 /*
700 * Can not have different beacon interval on multiple
701 * AP interface case
702 */
703 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
704 (sc->nbcnvifs > 1) &&
705 (vif->type == NL80211_IFTYPE_AP) &&
706 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
707 ath_dbg(common, CONFIG,
708 "Changing beacon interval of multiple AP interfaces !\n");
709 return false;
710 }
711 /*
712 * Can not configure station vif's beacon config
713 * while on AP opmode
714 */
715 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
716 (vif->type != NL80211_IFTYPE_AP)) {
717 ath_dbg(common, CONFIG,
718 "STA vif's beacon not allowed on AP mode\n");
719 return false;
720 }
721 /*
722 * Do not allow beacon config if HW was already configured
723 * with another STA vif
724 */
725 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
726 (vif->type == NL80211_IFTYPE_STATION) &&
727 (sc->sc_flags & SC_OP_BEACONS) &&
728 !avp->primary_sta_vif) {
729 ath_dbg(common, CONFIG,
730 "Beacon already configured for a station interface\n");
731 return false;
732 }
733 return true;
734}
735
736void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
737{
738 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
739 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
740
741 if (!ath9k_allow_beacon_config(sc, vif))
742 return;
743
744 /* Setup the beacon configuration parameters */
745 cur_conf->beacon_interval = bss_conf->beacon_int;
746 cur_conf->dtim_period = bss_conf->dtim_period;
747 cur_conf->listen_interval = 1;
748 cur_conf->dtim_count = 1;
749 cur_conf->bmiss_timeout =
750 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
751
752 /*
753 * It looks like mac80211 may end up using beacon interval of zero in
754 * some cases (at least for mesh point). Avoid getting into an
755 * infinite loop by using a bit safer value instead. To be safe,
756 * do sanity check on beacon interval for all operating modes.
757 */
758 if (cur_conf->beacon_interval == 0)
759 cur_conf->beacon_interval = 100;
760
761 /*
762 * We don't parse dtim period from mac80211 during the driver
763 * initialization as it breaks association with hidden-ssid
764 * AP and it causes latency in roaming
765 */
766 if (cur_conf->dtim_period == 0)
767 cur_conf->dtim_period = 1;
768
769 ath_set_beacon(sc);
770}
771
772static bool ath_has_valid_bslot(struct ath_softc *sc)
773{
774 struct ath_vif *avp;
775 int slot;
776 bool found = false;
777
778 for (slot = 0; slot < ATH_BCBUF; slot++) {
779 if (sc->beacon.bslot[slot]) {
780 avp = (void *)sc->beacon.bslot[slot]->drv_priv;
781 if (avp->is_bslot_active) {
782 found = true;
783 break;
784 }
785 }
786 }
787 return found;
788}
789
790
791void ath_set_beacon(struct ath_softc *sc)
792{
793 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
794 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
795
796 switch (sc->sc_ah->opmode) {
797 case NL80211_IFTYPE_AP:
798 if (ath_has_valid_bslot(sc))
799 ath_beacon_config_ap(sc, cur_conf);
800 break;
801 case NL80211_IFTYPE_ADHOC:
802 case NL80211_IFTYPE_MESH_POINT:
803 ath_beacon_config_adhoc(sc, cur_conf);
804 break;
805 case NL80211_IFTYPE_STATION:
806 ath_beacon_config_sta(sc, cur_conf);
807 break;
808 default:
809 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
810 return;
811 }
812
813 sc->sc_flags |= SC_OP_BEACONS;
814}
815
816void ath9k_set_beaconing_status(struct ath_softc *sc, bool status)
817{
818 struct ath_hw *ah = sc->sc_ah;
819
820 if (!ath_has_valid_bslot(sc)) {
821 sc->sc_flags &= ~SC_OP_BEACONS;
822 return;
823 }
824
825 ath9k_ps_wakeup(sc);
826 if (status) {
827 /* Re-enable beaconing */
828 ah->imask |= ATH9K_INT_SWBA;
829 ath9k_hw_set_interrupts(ah);
830 } else {
831 /* Disable SWBA interrupt */
832 ah->imask &= ~ATH9K_INT_SWBA;
833 ath9k_hw_set_interrupts(ah);
834 tasklet_kill(&sc->bcon_tasklet);
835 ath9k_hw_stop_dma_queue(ah, sc->beacon.beaconq);
836 }
837 ath9k_ps_restore(sc);
838}