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.
20 * This function will modify certain transmit queue properties depending on
21 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
22 * settings and channel width min/max
24 static int ath_beaconq_config(struct ath_softc
*sc
)
26 struct ath_hal
*ah
= sc
->sc_ah
;
27 struct ath9k_tx_queue_info qi
;
29 ath9k_hw_get_txq_props(ah
, sc
->beacon
.beaconq
, &qi
);
30 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_AP
) {
31 /* Always burst out beacon and CAB traffic. */
36 /* Adhoc mode; important thing is to use 2x cwmin. */
37 qi
.tqi_aifs
= sc
->beacon
.beacon_qi
.tqi_aifs
;
38 qi
.tqi_cwmin
= 2*sc
->beacon
.beacon_qi
.tqi_cwmin
;
39 qi
.tqi_cwmax
= sc
->beacon
.beacon_qi
.tqi_cwmax
;
42 if (!ath9k_hw_set_txq_props(ah
, sc
->beacon
.beaconq
, &qi
)) {
43 DPRINTF(sc
, ATH_DBG_FATAL
,
44 "unable to update h/w beacon queue parameters\n");
47 ath9k_hw_resettxqueue(ah
, sc
->beacon
.beaconq
); /* push to h/w */
52 static void ath_bstuck_process(struct ath_softc
*sc
)
54 DPRINTF(sc
, ATH_DBG_BEACON
,
55 "stuck beacon; resetting (bmiss count %u)\n",
61 * Associates the beacon frame buffer with a transmit descriptor. Will set
62 * up all required antenna switch parameters, rate codes, and channel flags.
63 * Beacons are always sent out at the lowest rate, and are not retried.
65 static void ath_beacon_setup(struct ath_softc
*sc
,
66 struct ath_vap
*avp
, struct ath_buf
*bf
)
68 struct sk_buff
*skb
= (struct sk_buff
*)bf
->bf_mpdu
;
69 struct ath_hal
*ah
= sc
->sc_ah
;
71 struct ath9k_11n_rate_series series
[4];
72 struct ath_rate_table
*rt
;
78 DPRINTF(sc
, ATH_DBG_BEACON
, "m %p len %u\n", skb
, skb
->len
);
80 /* setup descriptors */
83 flags
= ATH9K_TXDESC_NOACK
;
85 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_ADHOC
&&
86 (ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
)) {
87 ds
->ds_link
= bf
->bf_daddr
; /* self-linked */
88 flags
|= ATH9K_TXDESC_VEOL
;
89 /* Let hardware handle antenna switching. */
94 * Switch antenna every beacon.
95 * Should only switch every beacon period, not for every
97 * XXX assumes two antenna
99 antenna
= ((sc
->beacon
.ast_be_xmit
/ sc
->sc_nbcnvaps
) & 1 ? 2 : 1);
102 ds
->ds_data
= bf
->bf_buf_addr
;
105 * Calculate rate code.
106 * XXX everything at min xmit rate
109 rt
= sc
->cur_rate_table
;
110 rate
= rt
->info
[rix
].ratecode
;
111 if (sc
->sc_flags
& SC_OP_PREAMBLE_SHORT
)
112 rate
|= rt
->info
[rix
].short_preamble
;
114 ath9k_hw_set11n_txdesc(ah
, ds
,
115 skb
->len
+ FCS_LEN
, /* frame length */
116 ATH9K_PKT_TYPE_BEACON
, /* Atheros packet type */
117 MAX_RATE_POWER
, /* FIXME */
118 ATH9K_TXKEYIX_INVALID
, /* no encryption */
119 ATH9K_KEY_TYPE_CLEAR
, /* no encryption */
124 /* NB: beacon's BufLen must be a multiple of 4 bytes */
125 ath9k_hw_filltxdesc(ah
, ds
,
126 roundup(skb
->len
, 4), /* buffer length */
127 true, /* first segment */
128 true, /* last segment */
129 ds
/* first descriptor */
132 memset(series
, 0, sizeof(struct ath9k_11n_rate_series
) * 4);
134 series
[0].Rate
= rate
;
135 series
[0].ChSel
= sc
->sc_tx_chainmask
;
136 series
[0].RateFlags
= (ctsrate
) ? ATH9K_RATESERIES_RTS_CTS
: 0;
137 ath9k_hw_set11n_ratescenario(ah
, ds
, ds
, 0,
138 ctsrate
, ctsduration
, series
, 4, 0);
141 /* Generate beacon frame and queue cab data for a vap */
142 static struct ath_buf
*ath_beacon_generate(struct ath_softc
*sc
, int if_id
)
147 struct ath_txq
*cabq
;
148 struct ieee80211_vif
*vif
;
149 struct ieee80211_tx_info
*info
;
152 vif
= sc
->sc_vaps
[if_id
];
155 avp
= (void *)vif
->drv_priv
;
156 cabq
= sc
->beacon
.cabq
;
158 if (avp
->av_bcbuf
== NULL
) {
159 DPRINTF(sc
, ATH_DBG_BEACON
, "avp=%p av_bcbuf=%p\n",
165 skb
= (struct sk_buff
*)bf
->bf_mpdu
;
167 pci_unmap_single(to_pci_dev(sc
->dev
), bf
->bf_dmacontext
,
170 dev_kfree_skb_any(skb
);
173 skb
= ieee80211_beacon_get(sc
->hw
, vif
);
178 info
= IEEE80211_SKB_CB(skb
);
179 if (info
->flags
& IEEE80211_TX_CTL_ASSIGN_SEQ
) {
181 * TODO: make sure the seq# gets assigned properly (vs. other
184 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
185 sc
->tx
.seq_no
+= 0x10;
186 hdr
->seq_ctrl
&= cpu_to_le16(IEEE80211_SCTL_FRAG
);
187 hdr
->seq_ctrl
|= cpu_to_le16(sc
->tx
.seq_no
);
190 bf
->bf_buf_addr
= bf
->bf_dmacontext
=
191 pci_map_single(to_pci_dev(sc
->dev
), skb
->data
,
194 if (unlikely(pci_dma_mapping_error(to_pci_dev(sc
->dev
),
196 dev_kfree_skb_any(skb
);
198 DPRINTF(sc
, ATH_DBG_CONFIG
,
199 "pci_dma_mapping_error() on beaconing\n");
203 skb
= ieee80211_get_buffered_bc(sc
->hw
, vif
);
206 * if the CABQ traffic from previous DTIM is pending and the current
207 * beacon is also a DTIM.
208 * 1) if there is only one vap let the cab traffic continue.
209 * 2) if there are more than one vap and we are using staggered
210 * beacons, then drain the cabq by dropping all the frames in
211 * the cabq so that the current vaps cab traffic can be scheduled.
213 spin_lock_bh(&cabq
->axq_lock
);
214 cabq_depth
= cabq
->axq_depth
;
215 spin_unlock_bh(&cabq
->axq_lock
);
217 if (skb
&& cabq_depth
) {
219 * Unlock the cabq lock as ath_tx_draintxq acquires
220 * the lock again which is a common function and that
221 * acquires txq lock inside.
223 if (sc
->sc_nvaps
> 1) {
224 ath_tx_draintxq(sc
, cabq
, false);
225 DPRINTF(sc
, ATH_DBG_BEACON
,
226 "flush previous cabq traffic\n");
230 /* Construct tx descriptor. */
231 ath_beacon_setup(sc
, avp
, bf
);
234 * Enable the CAB queue before the beacon queue to
235 * insure cab frames are triggered by this beacon.
238 ath_tx_cabq(sc
, skb
);
239 skb
= ieee80211_get_buffered_bc(sc
->hw
, vif
);
246 * Startup beacon transmission for adhoc mode when they are sent entirely
247 * by the hardware using the self-linked descriptor + veol trick.
249 static void ath_beacon_start_adhoc(struct ath_softc
*sc
, int if_id
)
251 struct ieee80211_vif
*vif
;
252 struct ath_hal
*ah
= sc
->sc_ah
;
257 vif
= sc
->sc_vaps
[if_id
];
260 avp
= (void *)vif
->drv_priv
;
262 if (avp
->av_bcbuf
== NULL
) {
263 DPRINTF(sc
, ATH_DBG_BEACON
, "avp=%p av_bcbuf=%p\n",
264 avp
, avp
!= NULL
? avp
->av_bcbuf
: NULL
);
268 skb
= (struct sk_buff
*) bf
->bf_mpdu
;
270 /* Construct tx descriptor. */
271 ath_beacon_setup(sc
, avp
, bf
);
273 /* NB: caller is known to have already stopped tx dma */
274 ath9k_hw_puttxbuf(ah
, sc
->beacon
.beaconq
, bf
->bf_daddr
);
275 ath9k_hw_txstart(ah
, sc
->beacon
.beaconq
);
276 DPRINTF(sc
, ATH_DBG_BEACON
, "TXDP%u = %llx (%p)\n",
277 sc
->beacon
.beaconq
, ito64(bf
->bf_daddr
), bf
->bf_desc
);
280 int ath_beaconq_setup(struct ath_hal
*ah
)
282 struct ath9k_tx_queue_info qi
;
284 memset(&qi
, 0, sizeof(qi
));
288 /* NB: don't enable any interrupts */
289 return ath9k_hw_setuptxqueue(ah
, ATH9K_TX_QUEUE_BEACON
, &qi
);
292 int ath_beacon_alloc(struct ath_softc
*sc
, int if_id
)
294 struct ieee80211_vif
*vif
;
296 struct ieee80211_hdr
*hdr
;
301 vif
= sc
->sc_vaps
[if_id
];
304 avp
= (void *)vif
->drv_priv
;
306 /* Allocate a beacon descriptor if we haven't done so. */
307 if (!avp
->av_bcbuf
) {
308 /* Allocate beacon state for hostap/ibss. We know
309 * a buffer is available. */
310 avp
->av_bcbuf
= list_first_entry(&sc
->beacon
.bbuf
,
311 struct ath_buf
, list
);
312 list_del(&avp
->av_bcbuf
->list
);
314 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_AP
||
315 !(sc
->sc_ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
)) {
318 * Assign the vap to a beacon xmit slot. As
319 * above, this cannot fail to find one.
322 for (slot
= 0; slot
< ATH_BCBUF
; slot
++)
323 if (sc
->beacon
.bslot
[slot
] == ATH_IF_ID_ANY
) {
325 * XXX hack, space out slots to better
328 if (slot
+1 < ATH_BCBUF
&&
329 sc
->beacon
.bslot
[slot
+1] ==
331 avp
->av_bslot
= slot
+1;
334 avp
->av_bslot
= slot
;
335 /* NB: keep looking for a double slot */
337 BUG_ON(sc
->beacon
.bslot
[avp
->av_bslot
] != ATH_IF_ID_ANY
);
338 sc
->beacon
.bslot
[avp
->av_bslot
] = if_id
;
343 /* release the previous beacon frame , if it already exists. */
345 if (bf
->bf_mpdu
!= NULL
) {
346 skb
= (struct sk_buff
*)bf
->bf_mpdu
;
347 pci_unmap_single(to_pci_dev(sc
->dev
), bf
->bf_dmacontext
,
350 dev_kfree_skb_any(skb
);
355 * NB: the beacon data buffer must be 32-bit aligned.
356 * FIXME: Fill avp->av_btxctl.txpower and
357 * avp->av_btxctl.shortPreamble
359 skb
= ieee80211_beacon_get(sc
->hw
, vif
);
361 DPRINTF(sc
, ATH_DBG_BEACON
, "cannot get skb\n");
365 tstamp
= ((struct ieee80211_mgmt
*)skb
->data
)->u
.beacon
.timestamp
;
366 sc
->beacon
.bc_tstamp
= le64_to_cpu(tstamp
);
369 * Calculate a TSF adjustment factor required for
370 * staggered beacons. Note that we assume the format
371 * of the beacon frame leaves the tstamp field immediately
372 * following the header.
374 if (avp
->av_bslot
> 0) {
379 intval
= sc
->hw
->conf
.beacon_int
?
380 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
383 * The beacon interval is in TU's; the TSF in usecs.
384 * We figure out how many TU's to add to align the
385 * timestamp then convert to TSF units and handle
386 * byte swapping before writing it in the frame.
387 * The hardware will then add this each time a beacon
388 * frame is sent. Note that we align vap's 1..N
389 * and leave vap 0 untouched. This means vap 0
390 * has a timestamp in one beacon interval while the
391 * others get a timestamp aligned to the next interval.
393 tsfadjust
= (intval
* (ATH_BCBUF
- avp
->av_bslot
)) / ATH_BCBUF
;
394 val
= cpu_to_le64(tsfadjust
<< 10); /* TU->TSF */
396 DPRINTF(sc
, ATH_DBG_BEACON
,
397 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
398 avp
->av_bslot
, intval
, (unsigned long long)tsfadjust
);
400 hdr
= (struct ieee80211_hdr
*)skb
->data
;
401 memcpy(&hdr
[1], &val
, sizeof(val
));
405 bf
->bf_buf_addr
= bf
->bf_dmacontext
=
406 pci_map_single(to_pci_dev(sc
->dev
), skb
->data
,
409 if (unlikely(pci_dma_mapping_error(to_pci_dev(sc
->dev
),
411 dev_kfree_skb_any(skb
);
413 DPRINTF(sc
, ATH_DBG_CONFIG
,
414 "pci_dma_mapping_error() on beacon alloc\n");
421 void ath_beacon_return(struct ath_softc
*sc
, struct ath_vap
*avp
)
423 if (avp
->av_bcbuf
!= NULL
) {
426 if (avp
->av_bslot
!= -1) {
427 sc
->beacon
.bslot
[avp
->av_bslot
] = ATH_IF_ID_ANY
;
432 if (bf
->bf_mpdu
!= NULL
) {
433 struct sk_buff
*skb
= (struct sk_buff
*)bf
->bf_mpdu
;
434 pci_unmap_single(to_pci_dev(sc
->dev
),
438 dev_kfree_skb_any(skb
);
441 list_add_tail(&bf
->list
, &sc
->beacon
.bbuf
);
443 avp
->av_bcbuf
= NULL
;
447 void ath9k_beacon_tasklet(unsigned long data
)
449 struct ath_softc
*sc
= (struct ath_softc
*)data
;
450 struct ath_hal
*ah
= sc
->sc_ah
;
451 struct ath_buf
*bf
= NULL
;
454 u32 rx_clear
= 0, rx_frame
= 0, tx_frame
= 0;
456 u32 bc
= 0; /* beacon count */
461 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
462 show_cycles
= ath9k_hw_GetMibCycleCountsPct(ah
,
463 &rx_clear
, &rx_frame
, &tx_frame
);
467 * Check if the previous beacon has gone out. If
468 * not don't try to post another, skip this period
469 * and wait for the next. Missed beacons indicate
470 * a problem and should not occur. If we miss too
471 * many consecutive beacons reset the device.
473 * FIXME: Clean up this mess !!
475 if (ath9k_hw_numtxpending(ah
, sc
->beacon
.beaconq
) != 0) {
476 sc
->beacon
.bmisscnt
++;
477 /* XXX: doth needs the chanchange IE countdown decremented.
478 * We should consider adding a mac80211 call to indicate
479 * a beacon miss so appropriate action could be taken
482 if (sc
->beacon
.bmisscnt
< BSTUCK_THRESH
) {
483 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
484 DPRINTF(sc
, ATH_DBG_BEACON
,
485 "missed %u consecutive beacons\n",
486 sc
->beacon
.bmisscnt
);
489 * Display cycle counter stats from HW
490 * to aide in debug of stickiness.
492 DPRINTF(sc
, ATH_DBG_BEACON
,
493 "busy times: rx_clear=%d, "
494 "rx_frame=%d, tx_frame=%d\n",
498 DPRINTF(sc
, ATH_DBG_BEACON
,
503 DPRINTF(sc
, ATH_DBG_BEACON
,
504 "missed %u consecutive beacons\n",
505 sc
->beacon
.bmisscnt
);
507 } else if (sc
->beacon
.bmisscnt
>= BSTUCK_THRESH
) {
508 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
509 if (sc
->beacon
.bmisscnt
== BSTUCK_THRESH
) {
510 DPRINTF(sc
, ATH_DBG_BEACON
,
511 "beacon is officially "
515 DPRINTF(sc
, ATH_DBG_BEACON
,
516 "beacon is officially stuck\n");
517 ath_bstuck_process(sc
);
523 if (sc
->beacon
.bmisscnt
!= 0) {
524 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
525 DPRINTF(sc
, ATH_DBG_BEACON
,
526 "resume beacon xmit after %u misses\n",
527 sc
->beacon
.bmisscnt
);
529 DPRINTF(sc
, ATH_DBG_BEACON
,
530 "resume beacon xmit after %u misses\n",
531 sc
->beacon
.bmisscnt
);
533 sc
->beacon
.bmisscnt
= 0;
537 * Generate beacon frames. we are sending frames
538 * staggered so calculate the slot for this frame based
539 * on the tsf to safeguard against missing an swba.
542 intval
= sc
->hw
->conf
.beacon_int
?
543 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
545 tsf
= ath9k_hw_gettsf64(ah
);
546 tsftu
= TSF_TO_TU(tsf
>>32, tsf
);
547 slot
= ((tsftu
% intval
) * ATH_BCBUF
) / intval
;
548 if_id
= sc
->beacon
.bslot
[(slot
+ 1) % ATH_BCBUF
];
550 DPRINTF(sc
, ATH_DBG_BEACON
,
551 "slot %d [tsf %llu tsftu %u intval %u] if_id %d\n",
552 slot
, (unsigned long long)tsf
, tsftu
,
556 if (if_id
!= ATH_IF_ID_ANY
) {
557 bf
= ath_beacon_generate(sc
, if_id
);
559 bfaddr
= bf
->bf_daddr
;
564 * Handle slot time change when a non-ERP station joins/leaves
565 * an 11g network. The 802.11 layer notifies us via callback,
566 * we mark updateslot, then wait one beacon before effecting
567 * the change. This gives associated stations at least one
568 * beacon interval to note the state change.
570 * NB: The slot time change state machine is clocked according
571 * to whether we are bursting or staggering beacons. We
572 * recognize the request to update and record the current
573 * slot then don't transition until that slot is reached
574 * again. If we miss a beacon for that slot then we'll be
575 * slow to transition but we'll be sure at least one beacon
576 * interval has passed. When bursting slot is always left
577 * set to ATH_BCBUF so this check is a noop.
580 if (sc
->beacon
.updateslot
== UPDATE
) {
581 sc
->beacon
.updateslot
= COMMIT
; /* commit next beacon */
582 sc
->beacon
.slotupdate
= slot
;
583 } else if (sc
->beacon
.updateslot
== COMMIT
&& sc
->beacon
.slotupdate
== slot
) {
584 ath9k_hw_setslottime(sc
->sc_ah
, sc
->beacon
.slottime
);
585 sc
->beacon
.updateslot
= OK
;
589 * Stop any current dma and put the new frame(s) on the queue.
590 * This should never fail since we check above that no frames
591 * are still pending on the queue.
593 if (!ath9k_hw_stoptxdma(ah
, sc
->beacon
.beaconq
)) {
594 DPRINTF(sc
, ATH_DBG_FATAL
,
595 "beacon queue %u did not stop?\n", sc
->beacon
.beaconq
);
596 /* NB: the HAL still stops DMA, so proceed */
599 /* NB: cabq traffic should already be queued and primed */
600 ath9k_hw_puttxbuf(ah
, sc
->beacon
.beaconq
, bfaddr
);
601 ath9k_hw_txstart(ah
, sc
->beacon
.beaconq
);
603 sc
->beacon
.ast_be_xmit
+= bc
; /* XXX per-vap? */
608 * Configure the beacon and sleep timers.
610 * When operating as an AP this resets the TSF and sets
611 * up the hardware to notify us when we need to issue beacons.
613 * When operating in station mode this sets up the beacon
614 * timers according to the timestamp of the last received
615 * beacon and the current TSF, configures PCF and DTIM
616 * handling, programs the sleep registers so the hardware
617 * will wakeup in time to receive beacons, and configures
618 * the beacon miss handling so we'll receive a BMISS
619 * interrupt when we stop seeing beacons from the AP
620 * we've associated with.
622 void ath_beacon_config(struct ath_softc
*sc
, int if_id
)
624 struct ieee80211_vif
*vif
;
625 struct ath_hal
*ah
= sc
->sc_ah
;
626 struct ath_beacon_config conf
;
628 enum nl80211_iftype opmode
;
629 u32 nexttbtt
, intval
;
631 if (if_id
!= ATH_IF_ID_ANY
) {
632 vif
= sc
->sc_vaps
[if_id
];
634 avp
= (void *)vif
->drv_priv
;
635 opmode
= avp
->av_opmode
;
637 opmode
= sc
->sc_ah
->ah_opmode
;
640 memset(&conf
, 0, sizeof(struct ath_beacon_config
));
642 conf
.beacon_interval
= sc
->hw
->conf
.beacon_int
?
643 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
644 conf
.listen_interval
= 1;
645 conf
.dtim_period
= conf
.beacon_interval
;
647 conf
.bmiss_timeout
= ATH_DEFAULT_BMISS_LIMIT
* conf
.beacon_interval
;
649 /* extract tstamp from last beacon and convert to TU */
650 nexttbtt
= TSF_TO_TU(sc
->beacon
.bc_tstamp
>> 32, sc
->beacon
.bc_tstamp
);
652 /* XXX conditionalize multi-bss support? */
653 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_AP
) {
655 * For multi-bss ap support beacons are either staggered
656 * evenly over N slots or burst together. For the former
657 * arrange for the SWBA to be delivered for each slot.
658 * Slots that are not occupied will generate nothing.
660 /* NB: the beacon interval is kept internally in TU's */
661 intval
= conf
.beacon_interval
& ATH9K_BEACON_PERIOD
;
662 intval
/= ATH_BCBUF
; /* for staggered beacons */
664 intval
= conf
.beacon_interval
& ATH9K_BEACON_PERIOD
;
667 if (nexttbtt
== 0) /* e.g. for ap mode */
669 else if (intval
) /* NB: can be 0 for monitor mode */
670 nexttbtt
= roundup(nexttbtt
, intval
);
672 DPRINTF(sc
, ATH_DBG_BEACON
, "nexttbtt %u intval %u (%u)\n",
673 nexttbtt
, intval
, conf
.beacon_interval
);
675 /* Check for NL80211_IFTYPE_AP and sc_nostabeacons for WDS client */
676 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_STATION
) {
677 struct ath9k_beacon_state bs
;
680 int dtimperiod
, dtimcount
, sleepduration
;
681 int cfpperiod
, cfpcount
;
684 * Setup dtim and cfp parameters according to
685 * last beacon we received (which may be none).
687 dtimperiod
= conf
.dtim_period
;
688 if (dtimperiod
<= 0) /* NB: 0 if not known */
690 dtimcount
= conf
.dtim_count
;
691 if (dtimcount
>= dtimperiod
) /* NB: sanity check */
693 cfpperiod
= 1; /* NB: no PCF support yet */
696 sleepduration
= conf
.listen_interval
* intval
;
697 if (sleepduration
<= 0)
698 sleepduration
= intval
;
702 * Pull nexttbtt forward to reflect the current
703 * TSF and calculate dtim+cfp state for the result.
705 tsf
= ath9k_hw_gettsf64(ah
);
706 tsftu
= TSF_TO_TU(tsf
>>32, tsf
) + FUDGE
;
709 if (--dtimcount
< 0) {
710 dtimcount
= dtimperiod
- 1;
712 cfpcount
= cfpperiod
- 1;
714 } while (nexttbtt
< tsftu
);
716 memset(&bs
, 0, sizeof(bs
));
717 bs
.bs_intval
= intval
;
718 bs
.bs_nexttbtt
= nexttbtt
;
719 bs
.bs_dtimperiod
= dtimperiod
*intval
;
720 bs
.bs_nextdtim
= bs
.bs_nexttbtt
+ dtimcount
*intval
;
721 bs
.bs_cfpperiod
= cfpperiod
*bs
.bs_dtimperiod
;
722 bs
.bs_cfpnext
= bs
.bs_nextdtim
+ cfpcount
*bs
.bs_dtimperiod
;
723 bs
.bs_cfpmaxduration
= 0;
726 * Calculate the number of consecutive beacons to miss
727 * before taking a BMISS interrupt. The configuration
728 * is specified in TU so we only need calculate based
729 * on the beacon interval. Note that we clamp the
730 * result to at most 15 beacons.
732 if (sleepduration
> intval
) {
733 bs
.bs_bmissthreshold
= conf
.listen_interval
*
734 ATH_DEFAULT_BMISS_LIMIT
/ 2;
736 bs
.bs_bmissthreshold
=
737 DIV_ROUND_UP(conf
.bmiss_timeout
, intval
);
738 if (bs
.bs_bmissthreshold
> 15)
739 bs
.bs_bmissthreshold
= 15;
740 else if (bs
.bs_bmissthreshold
<= 0)
741 bs
.bs_bmissthreshold
= 1;
745 * Calculate sleep duration. The configuration is
746 * given in ms. We insure a multiple of the beacon
747 * period is used. Also, if the sleep duration is
748 * greater than the DTIM period then it makes senses
749 * to make it a multiple of that.
754 bs
.bs_sleepduration
= roundup(IEEE80211_MS_TO_TU(100),
756 if (bs
.bs_sleepduration
> bs
.bs_dtimperiod
)
757 bs
.bs_sleepduration
= bs
.bs_dtimperiod
;
759 DPRINTF(sc
, ATH_DBG_BEACON
,
772 (unsigned long long)tsf
, tsftu
,
777 bs
.bs_bmissthreshold
,
780 bs
.bs_cfpmaxduration
,
785 ath9k_hw_set_interrupts(ah
, 0);
786 ath9k_hw_set_sta_beacon_timers(ah
, &bs
);
787 sc
->sc_imask
|= ATH9K_INT_BMISS
;
788 ath9k_hw_set_interrupts(ah
, sc
->sc_imask
);
792 ath9k_hw_set_interrupts(ah
, 0);
793 if (nexttbtt
== intval
)
794 intval
|= ATH9K_BEACON_RESET_TSF
;
795 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_ADHOC
) {
797 * Pull nexttbtt forward to reflect the current
801 if (!(intval
& ATH9K_BEACON_RESET_TSF
)) {
802 tsf
= ath9k_hw_gettsf64(ah
);
803 tsftu
= TSF_TO_TU((u32
)(tsf
>>32),
807 } while (nexttbtt
< tsftu
);
810 DPRINTF(sc
, ATH_DBG_BEACON
,
811 "IBSS nexttbtt %u intval %u (%u)\n",
813 intval
& ~ATH9K_BEACON_RESET_TSF
,
814 conf
.beacon_interval
);
817 * In IBSS mode enable the beacon timers but only
818 * enable SWBA interrupts if we need to manually
819 * prepare beacon frames. Otherwise we use a
820 * self-linked tx descriptor and let the hardware
823 intval
|= ATH9K_BEACON_ENA
;
824 if (!(ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
))
825 sc
->sc_imask
|= ATH9K_INT_SWBA
;
826 ath_beaconq_config(sc
);
827 } else if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_AP
) {
829 * In AP mode we enable the beacon timers and
830 * SWBA interrupts to prepare beacon frames.
832 intval
|= ATH9K_BEACON_ENA
;
833 sc
->sc_imask
|= ATH9K_INT_SWBA
; /* beacon prepare */
834 ath_beaconq_config(sc
);
836 ath9k_hw_beaconinit(ah
, nexttbtt
, intval
);
837 sc
->beacon
.bmisscnt
= 0;
838 ath9k_hw_set_interrupts(ah
, sc
->sc_imask
);
840 * When using a self-linked beacon descriptor in
841 * ibss mode load it once here.
843 if (sc
->sc_ah
->ah_opmode
== NL80211_IFTYPE_ADHOC
&&
844 (ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
))
845 ath_beacon_start_adhoc(sc
, 0);
849 void ath_beacon_sync(struct ath_softc
*sc
, int if_id
)
852 * Resync beacon timers using the tsf of the
853 * beacon frame we just received.
855 ath_beacon_config(sc
, if_id
);
856 sc
->sc_flags
|= SC_OP_BEACONS
;