2 * Copyright (c) 2008 Atheros Communications Inc.
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.
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.
17 /* Implementation of beacon processing. */
19 #include <asm/unaligned.h>
23 * Configure parameters for the beacon queue
25 * This function will modify certain transmit queue properties depending on
26 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
27 * settings and channel width min/max
30 static int ath_beaconq_config(struct ath_softc *sc)
32 struct ath_hal *ah = sc->sc_ah;
33 struct ath9k_tx_queue_info qi;
35 ath9k_hw_get_txq_props(ah, sc->sc_bhalq, &qi);
36 if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) {
37 /* Always burst out beacon and CAB traffic. */
42 /* Adhoc mode; important thing is to use 2x cwmin. */
43 qi.tqi_aifs = sc->sc_beacon_qi.tqi_aifs;
44 qi.tqi_cwmin = 2*sc->sc_beacon_qi.tqi_cwmin;
45 qi.tqi_cwmax = sc->sc_beacon_qi.tqi_cwmax;
48 if (!ath9k_hw_set_txq_props(ah, sc->sc_bhalq, &qi)) {
49 DPRINTF(sc, ATH_DBG_FATAL,
50 "%s: unable to update h/w beacon queue parameters\n",
54 ath9k_hw_resettxqueue(ah, sc->sc_bhalq); /* push to h/w */
60 * Setup the beacon frame for transmit.
62 * Associates the beacon frame buffer with a transmit descriptor. Will set
63 * up all required antenna switch parameters, rate codes, and channel flags.
64 * Beacons are always sent out at the lowest rate, and are not retried.
67 static void ath_beacon_setup(struct ath_softc *sc,
68 struct ath_vap *avp, struct ath_buf *bf)
70 struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
71 struct ath_hal *ah = sc->sc_ah;
74 const struct ath9k_rate_table *rt;
78 struct ath9k_11n_rate_series series[4];
80 DPRINTF(sc, ATH_DBG_BEACON, "%s: m %p len %u\n",
81 __func__, skb, skb->len);
83 /* setup descriptors */
86 flags = ATH9K_TXDESC_NOACK;
88 if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS &&
89 (ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
90 ds->ds_link = bf->bf_daddr; /* self-linked */
91 flags |= ATH9K_TXDESC_VEOL;
92 /* Let hardware handle antenna switching. */
97 * Switch antenna every beacon.
98 * Should only switch every beacon period, not for every
100 * XXX assumes two antenna
102 antenna = ((sc->ast_be_xmit / sc->sc_nbcnvaps) & 1 ? 2 : 1);
105 ds->ds_data = bf->bf_buf_addr;
108 * Calculate rate code.
109 * XXX everything at min xmit rate
112 rt = sc->sc_currates;
113 rate = rt->info[rix].rateCode;
114 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
115 rate |= rt->info[rix].shortPreamble;
117 ath9k_hw_set11n_txdesc(ah, ds,
118 skb->len + FCS_LEN, /* frame length */
119 ATH9K_PKT_TYPE_BEACON, /* Atheros packet type */
120 avp->av_btxctl.txpower, /* txpower XXX */
121 ATH9K_TXKEYIX_INVALID, /* no encryption */
122 ATH9K_KEY_TYPE_CLEAR, /* no encryption */
123 flags /* no ack, veol for beacons */
126 /* NB: beacon's BufLen must be a multiple of 4 bytes */
127 ath9k_hw_filltxdesc(ah, ds,
128 roundup(skb->len, 4), /* buffer length */
129 true, /* first segment */
130 true, /* last segment */
131 ds /* first descriptor */
134 memzero(series, sizeof(struct ath9k_11n_rate_series) * 4);
136 series[0].Rate = rate;
137 series[0].ChSel = sc->sc_tx_chainmask;
138 series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
139 ath9k_hw_set11n_ratescenario(ah, ds, ds, 0,
140 ctsrate, ctsduration, series, 4, 0);
144 * Generate beacon frame and queue cab data for a vap.
146 * Updates the contents of the beacon frame. It is assumed that the buffer for
147 * the beacon frame has been allocated in the ATH object, and simply needs to
148 * be filled for this cycle. Also, any CAB (crap after beacon?) traffic will
149 * be added to the beacon frame at this point.
151 static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
157 struct ath_txq *cabq;
158 struct ieee80211_tx_info *info;
159 avp = sc->sc_vaps[if_id];
165 if (avp->av_bcbuf == NULL) {
166 DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n",
167 __func__, avp, avp->av_bcbuf);
171 skb = (struct sk_buff *) bf->bf_mpdu;
173 pci_unmap_single(sc->pdev, bf->bf_dmacontext,
174 skb_end_pointer(skb) - skb->head,
178 skb = ieee80211_beacon_get(sc->hw, avp->av_if_data);
182 info = IEEE80211_SKB_CB(skb);
183 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
185 * TODO: make sure the seq# gets assigned properly (vs. other
188 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
190 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
191 hdr->seq_ctrl |= cpu_to_le16(sc->seq_no);
193 bf->bf_buf_addr = bf->bf_dmacontext =
194 pci_map_single(sc->pdev, skb->data,
195 skb_end_pointer(skb) - skb->head,
198 skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
201 * if the CABQ traffic from previous DTIM is pending and the current
202 * beacon is also a DTIM.
203 * 1) if there is only one vap let the cab traffic continue.
204 * 2) if there are more than one vap and we are using staggered
205 * beacons, then drain the cabq by dropping all the frames in
206 * the cabq so that the current vaps cab traffic can be scheduled.
208 spin_lock_bh(&cabq->axq_lock);
209 cabq_depth = cabq->axq_depth;
210 spin_unlock_bh(&cabq->axq_lock);
212 if (skb && cabq_depth) {
214 * Unlock the cabq lock as ath_tx_draintxq acquires
215 * the lock again which is a common function and that
216 * acquires txq lock inside.
218 if (sc->sc_nvaps > 1) {
219 ath_tx_draintxq(sc, cabq, false);
220 DPRINTF(sc, ATH_DBG_BEACON,
221 "%s: flush previous cabq traffic\n", __func__);
225 /* Construct tx descriptor. */
226 ath_beacon_setup(sc, avp, bf);
229 * Enable the CAB queue before the beacon queue to
230 * insure cab frames are triggered by this beacon.
233 ath_tx_cabq(sc, skb);
234 skb = ieee80211_get_buffered_bc(sc->hw, avp->av_if_data);
241 * Startup beacon transmission for adhoc mode when they are sent entirely
242 * by the hardware using the self-linked descriptor + veol trick.
245 static void ath_beacon_start_adhoc(struct ath_softc *sc, int if_id)
247 struct ath_hal *ah = sc->sc_ah;
252 avp = sc->sc_vaps[if_id];
255 if (avp->av_bcbuf == NULL) {
256 DPRINTF(sc, ATH_DBG_BEACON, "%s: avp=%p av_bcbuf=%p\n",
257 __func__, avp, avp != NULL ? avp->av_bcbuf : NULL);
261 skb = (struct sk_buff *) bf->bf_mpdu;
263 /* Construct tx descriptor. */
264 ath_beacon_setup(sc, avp, bf);
266 /* NB: caller is known to have already stopped tx dma */
267 ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bf->bf_daddr);
268 ath9k_hw_txstart(ah, sc->sc_bhalq);
269 DPRINTF(sc, ATH_DBG_BEACON, "%s: TXDP%u = %llx (%p)\n", __func__,
270 sc->sc_bhalq, ito64(bf->bf_daddr), bf->bf_desc);
274 * Setup a h/w transmit queue for beacons.
276 * This function allocates an information structure (struct ath9k_txq_info)
277 * on the stack, sets some specific parameters (zero out channel width
278 * min/max, and enable aifs). The info structure does not need to be
282 int ath_beaconq_setup(struct ath_hal *ah)
284 struct ath9k_tx_queue_info qi;
286 memzero(&qi, sizeof(qi));
290 /* NB: don't enable any interrupts */
291 return ath9k_hw_setuptxqueue(ah, ATH9K_TX_QUEUE_BEACON, &qi);
296 * Allocate and setup an initial beacon frame.
298 * Allocate a beacon state variable for a specific VAP instance created on
299 * the ATH interface. This routine also calculates the beacon "slot" for
300 * staggared beacons in the mBSSID case.
303 int ath_beacon_alloc(struct ath_softc *sc, int if_id)
306 struct ieee80211_hdr *wh;
310 avp = sc->sc_vaps[if_id];
313 /* Allocate a beacon descriptor if we haven't done so. */
314 if (!avp->av_bcbuf) {
316 * Allocate beacon state for hostap/ibss. We know
317 * a buffer is available.
320 avp->av_bcbuf = list_first_entry(&sc->sc_bbuf,
321 struct ath_buf, list);
322 list_del(&avp->av_bcbuf->list);
324 if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP ||
325 !(sc->sc_ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL)) {
328 * Assign the vap to a beacon xmit slot. As
329 * above, this cannot fail to find one.
332 for (slot = 0; slot < ATH_BCBUF; slot++)
333 if (sc->sc_bslot[slot] == ATH_IF_ID_ANY) {
335 * XXX hack, space out slots to better
338 if (slot+1 < ATH_BCBUF &&
339 sc->sc_bslot[slot+1] ==
341 avp->av_bslot = slot+1;
344 avp->av_bslot = slot;
345 /* NB: keep looking for a double slot */
347 BUG_ON(sc->sc_bslot[avp->av_bslot] != ATH_IF_ID_ANY);
348 sc->sc_bslot[avp->av_bslot] = if_id;
353 /* release the previous beacon frame , if it already exists. */
355 if (bf->bf_mpdu != NULL) {
356 skb = (struct sk_buff *)bf->bf_mpdu;
357 pci_unmap_single(sc->pdev, bf->bf_dmacontext,
358 skb_end_pointer(skb) - skb->head,
360 dev_kfree_skb_any(skb);
365 * NB: the beacon data buffer must be 32-bit aligned;
366 * we assume the wbuf routines will return us something
367 * with this alignment (perhaps should assert).
368 * FIXME: Fill avp->av_btxctl.txpower and
369 * avp->av_btxctl.shortPreamble
371 skb = ieee80211_beacon_get(sc->hw, avp->av_if_data);
373 DPRINTF(sc, ATH_DBG_BEACON, "%s: cannot get skb\n",
379 * Calculate a TSF adjustment factor required for
380 * staggered beacons. Note that we assume the format
381 * of the beacon frame leaves the tstamp field immediately
382 * following the header.
384 if (avp->av_bslot > 0) {
389 intval = sc->hw->conf.beacon_int ?
390 sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
393 * The beacon interval is in TU's; the TSF in usecs.
394 * We figure out how many TU's to add to align the
395 * timestamp then convert to TSF units and handle
396 * byte swapping before writing it in the frame.
397 * The hardware will then add this each time a beacon
398 * frame is sent. Note that we align vap's 1..N
399 * and leave vap 0 untouched. This means vap 0
400 * has a timestamp in one beacon interval while the
401 * others get a timestamp aligned to the next interval.
403 tsfadjust = (intval * (ATH_BCBUF - avp->av_bslot)) / ATH_BCBUF;
404 val = cpu_to_le64(tsfadjust << 10); /* TU->TSF */
406 DPRINTF(sc, ATH_DBG_BEACON,
407 "%s: %s beacons, bslot %d intval %u tsfadjust %llu\n",
409 avp->av_bslot, intval, (unsigned long long)tsfadjust);
411 wh = (struct ieee80211_hdr *)skb->data;
412 memcpy(&wh[1], &val, sizeof(val));
415 bf->bf_buf_addr = bf->bf_dmacontext =
416 pci_map_single(sc->pdev, skb->data,
417 skb_end_pointer(skb) - skb->head,
425 * Reclaim beacon resources and return buffer to the pool.
427 * Checks the VAP to put the beacon frame buffer back to the ATH object
428 * queue, and de-allocates any wbuf frames that were sent as CAB traffic.
431 void ath_beacon_return(struct ath_softc *sc, struct ath_vap *avp)
433 if (avp->av_bcbuf != NULL) {
436 if (avp->av_bslot != -1) {
437 sc->sc_bslot[avp->av_bslot] = ATH_IF_ID_ANY;
442 if (bf->bf_mpdu != NULL) {
443 struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
444 pci_unmap_single(sc->pdev, bf->bf_dmacontext,
445 skb_end_pointer(skb) - skb->head,
447 dev_kfree_skb_any(skb);
450 list_add_tail(&bf->list, &sc->sc_bbuf);
452 avp->av_bcbuf = NULL;
457 * Reclaim beacon resources and return buffer to the pool.
459 * This function will free any wbuf frames that are still attached to the
460 * beacon buffers in the ATH object. Note that this does not de-allocate
461 * any wbuf objects that are in the transmit queue and have not yet returned
465 void ath_beacon_free(struct ath_softc *sc)
469 list_for_each_entry(bf, &sc->sc_bbuf, list) {
470 if (bf->bf_mpdu != NULL) {
471 struct sk_buff *skb = (struct sk_buff *) bf->bf_mpdu;
472 pci_unmap_single(sc->pdev, bf->bf_dmacontext,
473 skb_end_pointer(skb) - skb->head,
475 dev_kfree_skb_any(skb);
482 * Tasklet for Sending Beacons
484 * Transmit one or more beacon frames at SWBA. Dynamic updates to the frame
485 * contents are done as needed and the slot time is also adjusted based on
488 * This tasklet is not scheduled, it's called in ISR context.
491 void ath9k_beacon_tasklet(unsigned long data)
493 struct ath_softc *sc = (struct ath_softc *)data;
494 struct ath_hal *ah = sc->sc_ah;
495 struct ath_buf *bf = NULL;
498 u32 rx_clear = 0, rx_frame = 0, tx_frame = 0;
500 u32 bc = 0; /* beacon count */
505 if (sc->sc_flags & SC_OP_NO_RESET) {
506 show_cycles = ath9k_hw_GetMibCycleCountsPct(ah,
513 * Check if the previous beacon has gone out. If
514 * not don't try to post another, skip this period
515 * and wait for the next. Missed beacons indicate
516 * a problem and should not occur. If we miss too
517 * many consecutive beacons reset the device.
519 if (ath9k_hw_numtxpending(ah, sc->sc_bhalq) != 0) {
521 /* XXX: doth needs the chanchange IE countdown decremented.
522 * We should consider adding a mac80211 call to indicate
523 * a beacon miss so appropriate action could be taken
526 if (sc->sc_bmisscount < BSTUCK_THRESH) {
527 if (sc->sc_flags & SC_OP_NO_RESET) {
528 DPRINTF(sc, ATH_DBG_BEACON,
529 "%s: missed %u consecutive beacons\n",
530 __func__, sc->sc_bmisscount);
533 * Display cycle counter stats
534 * from HW to aide in debug of
539 "%s: busy times: rx_clear=%d, "
540 "rx_frame=%d, tx_frame=%d\n",
541 __func__, rx_clear, rx_frame,
546 "%s: unable to obtain "
547 "busy times\n", __func__);
550 DPRINTF(sc, ATH_DBG_BEACON,
551 "%s: missed %u consecutive beacons\n",
552 __func__, sc->sc_bmisscount);
554 } else if (sc->sc_bmisscount >= BSTUCK_THRESH) {
555 if (sc->sc_flags & SC_OP_NO_RESET) {
556 if (sc->sc_bmisscount == BSTUCK_THRESH) {
559 "%s: beacon is officially "
560 "stuck\n", __func__);
561 ath9k_hw_dmaRegDump(ah);
564 DPRINTF(sc, ATH_DBG_BEACON,
565 "%s: beacon is officially stuck\n",
567 ath_bstuck_process(sc);
573 if (sc->sc_bmisscount != 0) {
574 if (sc->sc_flags & SC_OP_NO_RESET) {
577 "%s: resume beacon xmit after %u misses\n",
578 __func__, sc->sc_bmisscount);
580 DPRINTF(sc, ATH_DBG_BEACON,
581 "%s: resume beacon xmit after %u misses\n",
582 __func__, sc->sc_bmisscount);
584 sc->sc_bmisscount = 0;
588 * Generate beacon frames. we are sending frames
589 * staggered so calculate the slot for this frame based
590 * on the tsf to safeguard against missing an swba.
593 intval = sc->hw->conf.beacon_int ?
594 sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
596 tsf = ath9k_hw_gettsf64(ah);
597 tsftu = TSF_TO_TU(tsf>>32, tsf);
598 slot = ((tsftu % intval) * ATH_BCBUF) / intval;
599 if_id = sc->sc_bslot[(slot + 1) % ATH_BCBUF];
600 DPRINTF(sc, ATH_DBG_BEACON,
601 "%s: slot %d [tsf %llu tsftu %u intval %u] if_id %d\n",
602 __func__, slot, (unsigned long long) tsf, tsftu,
605 if (if_id != ATH_IF_ID_ANY) {
606 bf = ath_beacon_generate(sc, if_id);
608 bfaddr = bf->bf_daddr;
613 * Handle slot time change when a non-ERP station joins/leaves
614 * an 11g network. The 802.11 layer notifies us via callback,
615 * we mark updateslot, then wait one beacon before effecting
616 * the change. This gives associated stations at least one
617 * beacon interval to note the state change.
619 * NB: The slot time change state machine is clocked according
620 * to whether we are bursting or staggering beacons. We
621 * recognize the request to update and record the current
622 * slot then don't transition until that slot is reached
623 * again. If we miss a beacon for that slot then we'll be
624 * slow to transition but we'll be sure at least one beacon
625 * interval has passed. When bursting slot is always left
626 * set to ATH_BCBUF so this check is a noop.
629 if (sc->sc_updateslot == UPDATE) {
630 sc->sc_updateslot = COMMIT; /* commit next beacon */
631 sc->sc_slotupdate = slot;
632 } else if (sc->sc_updateslot == COMMIT && sc->sc_slotupdate == slot)
633 ath_setslottime(sc); /* commit change to hardware */
637 * Stop any current dma and put the new frame(s) on the queue.
638 * This should never fail since we check above that no frames
639 * are still pending on the queue.
641 if (!ath9k_hw_stoptxdma(ah, sc->sc_bhalq)) {
642 DPRINTF(sc, ATH_DBG_FATAL,
643 "%s: beacon queue %u did not stop?\n",
644 __func__, sc->sc_bhalq);
645 /* NB: the HAL still stops DMA, so proceed */
648 /* NB: cabq traffic should already be queued and primed */
649 ath9k_hw_puttxbuf(ah, sc->sc_bhalq, bfaddr);
650 ath9k_hw_txstart(ah, sc->sc_bhalq);
652 sc->ast_be_xmit += bc; /* XXX per-vap? */
657 * Tasklet for Beacon Stuck processing
659 * Processing for Beacon Stuck.
660 * Basically calls the ath_internal_reset function to reset the chip.
663 void ath_bstuck_process(struct ath_softc *sc)
665 DPRINTF(sc, ATH_DBG_BEACON,
666 "%s: stuck beacon; resetting (bmiss count %u)\n",
667 __func__, sc->sc_bmisscount);
668 ath_reset(sc, false);
672 * Configure the beacon and sleep timers.
674 * When operating as an AP this resets the TSF and sets
675 * up the hardware to notify us when we need to issue beacons.
677 * When operating in station mode this sets up the beacon
678 * timers according to the timestamp of the last received
679 * beacon and the current TSF, configures PCF and DTIM
680 * handling, programs the sleep registers so the hardware
681 * will wakeup in time to receive beacons, and configures
682 * the beacon miss handling so we'll receive a BMISS
683 * interrupt when we stop seeing beacons from the AP
684 * we've associated with.
687 void ath_beacon_config(struct ath_softc *sc, int if_id)
689 struct ath_hal *ah = sc->sc_ah;
690 u32 nexttbtt, intval;
691 struct ath_beacon_config conf;
692 enum ath9k_opmode av_opmode;
694 if (if_id != ATH_IF_ID_ANY)
695 av_opmode = sc->sc_vaps[if_id]->av_opmode;
697 av_opmode = sc->sc_ah->ah_opmode;
699 memzero(&conf, sizeof(struct ath_beacon_config));
701 /* FIXME: Use default values for now - Sujith */
702 /* Query beacon configuration first */
704 * Protocol stack doesn't support dynamic beacon configuration,
705 * use default configurations.
707 conf.beacon_interval = sc->hw->conf.beacon_int ?
708 sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
709 conf.listen_interval = 1;
710 conf.dtim_period = conf.beacon_interval;
712 conf.bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf.beacon_interval;
714 /* extract tstamp from last beacon and convert to TU */
715 nexttbtt = TSF_TO_TU(get_unaligned_le32(conf.u.last_tstamp + 4),
716 get_unaligned_le32(conf.u.last_tstamp));
717 /* XXX conditionalize multi-bss support? */
718 if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) {
720 * For multi-bss ap support beacons are either staggered
721 * evenly over N slots or burst together. For the former
722 * arrange for the SWBA to be delivered for each slot.
723 * Slots that are not occupied will generate nothing.
725 /* NB: the beacon interval is kept internally in TU's */
726 intval = conf.beacon_interval & ATH9K_BEACON_PERIOD;
727 intval /= ATH_BCBUF; /* for staggered beacons */
729 intval = conf.beacon_interval & ATH9K_BEACON_PERIOD;
732 if (nexttbtt == 0) /* e.g. for ap mode */
734 else if (intval) /* NB: can be 0 for monitor mode */
735 nexttbtt = roundup(nexttbtt, intval);
736 DPRINTF(sc, ATH_DBG_BEACON, "%s: nexttbtt %u intval %u (%u)\n",
737 __func__, nexttbtt, intval, conf.beacon_interval);
738 /* Check for ATH9K_M_HOSTAP and sc_nostabeacons for WDS client */
739 if (sc->sc_ah->ah_opmode == ATH9K_M_STA) {
740 struct ath9k_beacon_state bs;
743 int dtimperiod, dtimcount, sleepduration;
744 int cfpperiod, cfpcount;
747 * Setup dtim and cfp parameters according to
748 * last beacon we received (which may be none).
750 dtimperiod = conf.dtim_period;
751 if (dtimperiod <= 0) /* NB: 0 if not known */
753 dtimcount = conf.dtim_count;
754 if (dtimcount >= dtimperiod) /* NB: sanity check */
755 dtimcount = 0; /* XXX? */
756 cfpperiod = 1; /* NB: no PCF support yet */
759 sleepduration = conf.listen_interval * intval;
760 if (sleepduration <= 0)
761 sleepduration = intval;
765 * Pull nexttbtt forward to reflect the current
766 * TSF and calculate dtim+cfp state for the result.
768 tsf = ath9k_hw_gettsf64(ah);
769 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
772 if (--dtimcount < 0) {
773 dtimcount = dtimperiod - 1;
775 cfpcount = cfpperiod - 1;
777 } while (nexttbtt < tsftu);
779 memzero(&bs, sizeof(bs));
780 bs.bs_intval = intval;
781 bs.bs_nexttbtt = nexttbtt;
782 bs.bs_dtimperiod = dtimperiod*intval;
783 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
784 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
785 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
786 bs.bs_cfpmaxduration = 0;
788 * Calculate the number of consecutive beacons to miss
789 * before taking a BMISS interrupt. The configuration
790 * is specified in TU so we only need calculate based
791 * on the beacon interval. Note that we clamp the
792 * result to at most 15 beacons.
794 if (sleepduration > intval) {
795 bs.bs_bmissthreshold =
796 conf.listen_interval *
797 ATH_DEFAULT_BMISS_LIMIT / 2;
799 bs.bs_bmissthreshold =
800 DIV_ROUND_UP(conf.bmiss_timeout, intval);
801 if (bs.bs_bmissthreshold > 15)
802 bs.bs_bmissthreshold = 15;
803 else if (bs.bs_bmissthreshold <= 0)
804 bs.bs_bmissthreshold = 1;
808 * Calculate sleep duration. The configuration is
809 * given in ms. We insure a multiple of the beacon
810 * period is used. Also, if the sleep duration is
811 * greater than the DTIM period then it makes senses
812 * to make it a multiple of that.
817 bs.bs_sleepduration =
818 roundup(IEEE80211_MS_TO_TU(100), sleepduration);
819 if (bs.bs_sleepduration > bs.bs_dtimperiod)
820 bs.bs_sleepduration = bs.bs_dtimperiod;
822 DPRINTF(sc, ATH_DBG_BEACON,
836 (unsigned long long)tsf, tsftu,
841 bs.bs_bmissthreshold,
844 bs.bs_cfpmaxduration,
849 ath9k_hw_set_interrupts(ah, 0);
850 ath9k_hw_set_sta_beacon_timers(ah, &bs);
851 sc->sc_imask |= ATH9K_INT_BMISS;
852 ath9k_hw_set_interrupts(ah, sc->sc_imask);
856 ath9k_hw_set_interrupts(ah, 0);
857 if (nexttbtt == intval)
858 intval |= ATH9K_BEACON_RESET_TSF;
859 if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS) {
861 * Pull nexttbtt forward to reflect the current
865 if (!(intval & ATH9K_BEACON_RESET_TSF)) {
866 tsf = ath9k_hw_gettsf64(ah);
867 tsftu = TSF_TO_TU((u32)(tsf>>32),
871 } while (nexttbtt < tsftu);
874 DPRINTF(sc, ATH_DBG_BEACON,
875 "%s: IBSS nexttbtt %u intval %u (%u)\n",
877 intval & ~ATH9K_BEACON_RESET_TSF,
878 conf.beacon_interval);
881 * In IBSS mode enable the beacon timers but only
882 * enable SWBA interrupts if we need to manually
883 * prepare beacon frames. Otherwise we use a
884 * self-linked tx descriptor and let the hardware
887 intval |= ATH9K_BEACON_ENA;
888 if (!(ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL))
889 sc->sc_imask |= ATH9K_INT_SWBA;
890 ath_beaconq_config(sc);
891 } else if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) {
893 * In AP mode we enable the beacon timers and
894 * SWBA interrupts to prepare beacon frames.
896 intval |= ATH9K_BEACON_ENA;
897 sc->sc_imask |= ATH9K_INT_SWBA; /* beacon prepare */
898 ath_beaconq_config(sc);
900 ath9k_hw_beaconinit(ah, nexttbtt, intval);
901 sc->sc_bmisscount = 0;
902 ath9k_hw_set_interrupts(ah, sc->sc_imask);
904 * When using a self-linked beacon descriptor in
905 * ibss mode load it once here.
907 if (sc->sc_ah->ah_opmode == ATH9K_M_IBSS &&
908 (ah->ah_caps.hw_caps & ATH9K_HW_CAP_VEOL))
909 ath_beacon_start_adhoc(sc, 0);
913 /* Function to collect beacon rssi data and resync beacon if necessary */
915 void ath_beacon_sync(struct ath_softc *sc, int if_id)
918 * Resync beacon timers using the tsf of the
919 * beacon frame we just received.
921 ath_beacon_config(sc, if_id);
922 sc->sc_flags |= SC_OP_BEACONS;