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. */
22 * Configure parameters for the beacon queue
24 * This function will modify certain transmit queue properties depending on
25 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
26 * settings and channel width min/max
28 static int ath_beaconq_config(struct ath_softc
*sc
)
30 struct ath_hal
*ah
= sc
->sc_ah
;
31 struct ath9k_tx_queue_info qi
;
33 ath9k_hw_get_txq_props(ah
, sc
->sc_bhalq
, &qi
);
34 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_HOSTAP
) {
35 /* Always burst out beacon and CAB traffic. */
40 /* Adhoc mode; important thing is to use 2x cwmin. */
41 qi
.tqi_aifs
= sc
->sc_beacon_qi
.tqi_aifs
;
42 qi
.tqi_cwmin
= 2*sc
->sc_beacon_qi
.tqi_cwmin
;
43 qi
.tqi_cwmax
= sc
->sc_beacon_qi
.tqi_cwmax
;
46 if (!ath9k_hw_set_txq_props(ah
, sc
->sc_bhalq
, &qi
)) {
47 DPRINTF(sc
, ATH_DBG_FATAL
,
48 "%s: unable to update h/w beacon queue parameters\n",
52 ath9k_hw_resettxqueue(ah
, sc
->sc_bhalq
); /* push to h/w */
58 * Setup the beacon frame for transmit.
60 * Associates the beacon frame buffer with a transmit descriptor. Will set
61 * up all required antenna switch parameters, rate codes, and channel flags.
62 * Beacons are always sent out at the lowest rate, and are not retried.
64 static void ath_beacon_setup(struct ath_softc
*sc
,
65 struct ath_vap
*avp
, struct ath_buf
*bf
)
67 struct sk_buff
*skb
= (struct sk_buff
*)bf
->bf_mpdu
;
68 struct ath_hal
*ah
= sc
->sc_ah
;
70 struct ath9k_11n_rate_series series
[4];
71 const struct ath9k_rate_table
*rt
;
77 DPRINTF(sc
, ATH_DBG_BEACON
, "%s: m %p len %u\n",
78 __func__
, skb
, skb
->len
);
80 /* setup descriptors */
83 flags
= ATH9K_TXDESC_NOACK
;
85 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_IBSS
&&
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
->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
->sc_currates
;
110 rate
= rt
->info
[rix
].rateCode
;
111 if (sc
->sc_flags
& SC_OP_PREAMBLE_SHORT
)
112 rate
|= rt
->info
[rix
].shortPreamble
;
114 ath9k_hw_set11n_txdesc(ah
, ds
,
115 skb
->len
+ FCS_LEN
, /* frame length */
116 ATH9K_PKT_TYPE_BEACON
, /* Atheros packet type */
117 avp
->av_btxctl
.txpower
, /* txpower XXX */
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);
142 * Generate beacon frame and queue cab data for a vap.
144 * Updates the contents of the beacon frame. It is assumed that the buffer for
145 * the beacon frame has been allocated in the ATH object, and simply needs to
146 * be filled for this cycle. Also, any CAB (crap after beacon?) traffic will
147 * be added to the beacon frame at this point.
149 static struct ath_buf
*ath_beacon_generate(struct ath_softc
*sc
, int if_id
)
154 struct ath_txq
*cabq
;
155 struct ieee80211_tx_info
*info
;
158 avp
= sc
->sc_vaps
[if_id
];
163 if (avp
->av_bcbuf
== NULL
) {
164 DPRINTF(sc
, ATH_DBG_BEACON
, "%s: avp=%p av_bcbuf=%p\n",
165 __func__
, avp
, avp
->av_bcbuf
);
170 skb
= (struct sk_buff
*)bf
->bf_mpdu
;
172 pci_unmap_single(sc
->pdev
, bf
->bf_dmacontext
,
177 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
);
194 bf
->bf_buf_addr
= bf
->bf_dmacontext
=
195 pci_map_single(sc
->pdev
, skb
->data
,
199 skb
= ieee80211_get_buffered_bc(sc
->hw
, avp
->av_if_data
);
202 * if the CABQ traffic from previous DTIM is pending and the current
203 * beacon is also a DTIM.
204 * 1) if there is only one vap let the cab traffic continue.
205 * 2) if there are more than one vap and we are using staggered
206 * beacons, then drain the cabq by dropping all the frames in
207 * the cabq so that the current vaps cab traffic can be scheduled.
209 spin_lock_bh(&cabq
->axq_lock
);
210 cabq_depth
= cabq
->axq_depth
;
211 spin_unlock_bh(&cabq
->axq_lock
);
213 if (skb
&& cabq_depth
) {
215 * Unlock the cabq lock as ath_tx_draintxq acquires
216 * the lock again which is a common function and that
217 * acquires txq lock inside.
219 if (sc
->sc_nvaps
> 1) {
220 ath_tx_draintxq(sc
, cabq
, false);
221 DPRINTF(sc
, ATH_DBG_BEACON
,
222 "%s: flush previous cabq traffic\n", __func__
);
226 /* Construct tx descriptor. */
227 ath_beacon_setup(sc
, avp
, bf
);
230 * Enable the CAB queue before the beacon queue to
231 * insure cab frames are triggered by this beacon.
234 ath_tx_cabq(sc
, skb
);
235 skb
= ieee80211_get_buffered_bc(sc
->hw
, avp
->av_if_data
);
242 * Startup beacon transmission for adhoc mode when they are sent entirely
243 * 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
281 int ath_beaconq_setup(struct ath_hal
*ah
)
283 struct ath9k_tx_queue_info qi
;
285 memset(&qi
, 0, sizeof(qi
));
289 /* NB: don't enable any interrupts */
290 return ath9k_hw_setuptxqueue(ah
, ATH9K_TX_QUEUE_BEACON
, &qi
);
295 * Allocate and setup an initial beacon frame.
297 * Allocate a beacon state variable for a specific VAP instance created on
298 * the ATH interface. This routine also calculates the beacon "slot" for
299 * staggared beacons in the mBSSID case.
301 int ath_beacon_alloc(struct ath_softc
*sc
, int if_id
)
304 struct ieee80211_hdr
*hdr
;
309 avp
= sc
->sc_vaps
[if_id
];
312 /* Allocate a beacon descriptor if we haven't done so. */
313 if (!avp
->av_bcbuf
) {
314 /* Allocate beacon state for hostap/ibss. We know
315 * a buffer is available. */
317 avp
->av_bcbuf
= list_first_entry(&sc
->sc_bbuf
,
318 struct ath_buf
, list
);
319 list_del(&avp
->av_bcbuf
->list
);
321 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_HOSTAP
||
322 !(sc
->sc_ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
)) {
325 * Assign the vap to a beacon xmit slot. As
326 * above, this cannot fail to find one.
329 for (slot
= 0; slot
< ATH_BCBUF
; slot
++)
330 if (sc
->sc_bslot
[slot
] == ATH_IF_ID_ANY
) {
332 * XXX hack, space out slots to better
335 if (slot
+1 < ATH_BCBUF
&&
336 sc
->sc_bslot
[slot
+1] ==
338 avp
->av_bslot
= slot
+1;
341 avp
->av_bslot
= slot
;
342 /* NB: keep looking for a double slot */
344 BUG_ON(sc
->sc_bslot
[avp
->av_bslot
] != ATH_IF_ID_ANY
);
345 sc
->sc_bslot
[avp
->av_bslot
] = if_id
;
350 /* release the previous beacon frame , if it already exists. */
352 if (bf
->bf_mpdu
!= NULL
) {
353 skb
= (struct sk_buff
*)bf
->bf_mpdu
;
354 pci_unmap_single(sc
->pdev
, bf
->bf_dmacontext
,
357 dev_kfree_skb_any(skb
);
362 * NB: the beacon data buffer must be 32-bit aligned.
363 * FIXME: Fill avp->av_btxctl.txpower and
364 * avp->av_btxctl.shortPreamble
366 skb
= ieee80211_beacon_get(sc
->hw
, avp
->av_if_data
);
368 DPRINTF(sc
, ATH_DBG_BEACON
, "%s: cannot get skb\n",
373 tstamp
= ((struct ieee80211_mgmt
*)skb
->data
)->u
.beacon
.timestamp
;
374 sc
->bc_tstamp
= le64_to_cpu(tstamp
);
377 * Calculate a TSF adjustment factor required for
378 * staggered beacons. Note that we assume the format
379 * of the beacon frame leaves the tstamp field immediately
380 * following the header.
382 if (avp
->av_bslot
> 0) {
387 intval
= sc
->hw
->conf
.beacon_int
?
388 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
391 * The beacon interval is in TU's; the TSF in usecs.
392 * We figure out how many TU's to add to align the
393 * timestamp then convert to TSF units and handle
394 * byte swapping before writing it in the frame.
395 * The hardware will then add this each time a beacon
396 * frame is sent. Note that we align vap's 1..N
397 * and leave vap 0 untouched. This means vap 0
398 * has a timestamp in one beacon interval while the
399 * others get a timestamp aligned to the next interval.
401 tsfadjust
= (intval
* (ATH_BCBUF
- avp
->av_bslot
)) / ATH_BCBUF
;
402 val
= cpu_to_le64(tsfadjust
<< 10); /* TU->TSF */
404 DPRINTF(sc
, ATH_DBG_BEACON
,
405 "%s: %s beacons, bslot %d intval %u tsfadjust %llu\n",
407 avp
->av_bslot
, intval
, (unsigned long long)tsfadjust
);
409 hdr
= (struct ieee80211_hdr
*)skb
->data
;
410 memcpy(&hdr
[1], &val
, sizeof(val
));
413 bf
->bf_buf_addr
= bf
->bf_dmacontext
=
414 pci_map_single(sc
->pdev
, skb
->data
,
423 * Reclaim beacon resources and return buffer to the pool.
425 * Checks the VAP to put the beacon frame buffer back to the ATH object
426 * queue, and de-allocates any skbs that were sent as CAB traffic.
428 void ath_beacon_return(struct ath_softc
*sc
, struct ath_vap
*avp
)
430 if (avp
->av_bcbuf
!= NULL
) {
433 if (avp
->av_bslot
!= -1) {
434 sc
->sc_bslot
[avp
->av_bslot
] = ATH_IF_ID_ANY
;
439 if (bf
->bf_mpdu
!= NULL
) {
440 struct sk_buff
*skb
= (struct sk_buff
*)bf
->bf_mpdu
;
441 pci_unmap_single(sc
->pdev
, bf
->bf_dmacontext
,
444 dev_kfree_skb_any(skb
);
447 list_add_tail(&bf
->list
, &sc
->sc_bbuf
);
449 avp
->av_bcbuf
= NULL
;
454 * Tasklet for Sending Beacons
456 * Transmit one or more beacon frames at SWBA. Dynamic updates to the frame
457 * contents are done as needed and the slot time is also adjusted based on
460 void ath9k_beacon_tasklet(unsigned long data
)
462 struct ath_softc
*sc
= (struct ath_softc
*)data
;
463 struct ath_hal
*ah
= sc
->sc_ah
;
464 struct ath_buf
*bf
= NULL
;
467 u32 rx_clear
= 0, rx_frame
= 0, tx_frame
= 0;
469 u32 bc
= 0; /* beacon count */
474 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
475 show_cycles
= ath9k_hw_GetMibCycleCountsPct(ah
,
482 * Check if the previous beacon has gone out. If
483 * not don't try to post another, skip this period
484 * and wait for the next. Missed beacons indicate
485 * a problem and should not occur. If we miss too
486 * many consecutive beacons reset the device.
488 * FIXME: Clean up this mess !!
490 if (ath9k_hw_numtxpending(ah
, sc
->sc_bhalq
) != 0) {
492 /* XXX: doth needs the chanchange IE countdown decremented.
493 * We should consider adding a mac80211 call to indicate
494 * a beacon miss so appropriate action could be taken
497 if (sc
->sc_bmisscount
< BSTUCK_THRESH
) {
498 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
499 DPRINTF(sc
, ATH_DBG_BEACON
,
500 "%s: missed %u consecutive beacons\n",
501 __func__
, sc
->sc_bmisscount
);
504 * Display cycle counter stats from HW
505 * to aide in debug of stickiness.
507 DPRINTF(sc
, ATH_DBG_BEACON
,
508 "%s: busy times: rx_clear=%d, "
509 "rx_frame=%d, tx_frame=%d\n",
510 __func__
, rx_clear
, rx_frame
,
513 DPRINTF(sc
, ATH_DBG_BEACON
,
514 "%s: unable to obtain "
515 "busy times\n", __func__
);
518 DPRINTF(sc
, ATH_DBG_BEACON
,
519 "%s: missed %u consecutive beacons\n",
520 __func__
, sc
->sc_bmisscount
);
522 } else if (sc
->sc_bmisscount
>= BSTUCK_THRESH
) {
523 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
524 if (sc
->sc_bmisscount
== BSTUCK_THRESH
) {
525 DPRINTF(sc
, ATH_DBG_BEACON
,
526 "%s: beacon is officially "
527 "stuck\n", __func__
);
528 ath9k_hw_dmaRegDump(ah
);
531 DPRINTF(sc
, ATH_DBG_BEACON
,
532 "%s: beacon is officially stuck\n",
534 ath_bstuck_process(sc
);
540 if (sc
->sc_bmisscount
!= 0) {
541 if (sc
->sc_flags
& SC_OP_NO_RESET
) {
542 DPRINTF(sc
, ATH_DBG_BEACON
,
543 "%s: resume beacon xmit after %u misses\n",
544 __func__
, sc
->sc_bmisscount
);
546 DPRINTF(sc
, ATH_DBG_BEACON
,
547 "%s: resume beacon xmit after %u misses\n",
548 __func__
, sc
->sc_bmisscount
);
550 sc
->sc_bmisscount
= 0;
554 * Generate beacon frames. we are sending frames
555 * staggered so calculate the slot for this frame based
556 * on the tsf to safeguard against missing an swba.
559 intval
= sc
->hw
->conf
.beacon_int
?
560 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
562 tsf
= ath9k_hw_gettsf64(ah
);
563 tsftu
= TSF_TO_TU(tsf
>>32, tsf
);
564 slot
= ((tsftu
% intval
) * ATH_BCBUF
) / intval
;
565 if_id
= sc
->sc_bslot
[(slot
+ 1) % ATH_BCBUF
];
567 DPRINTF(sc
, ATH_DBG_BEACON
,
568 "%s: slot %d [tsf %llu tsftu %u intval %u] if_id %d\n",
569 __func__
, slot
, (unsigned long long)tsf
, tsftu
,
573 if (if_id
!= ATH_IF_ID_ANY
) {
574 bf
= ath_beacon_generate(sc
, if_id
);
576 bfaddr
= bf
->bf_daddr
;
581 * Handle slot time change when a non-ERP station joins/leaves
582 * an 11g network. The 802.11 layer notifies us via callback,
583 * we mark updateslot, then wait one beacon before effecting
584 * the change. This gives associated stations at least one
585 * beacon interval to note the state change.
587 * NB: The slot time change state machine is clocked according
588 * to whether we are bursting or staggering beacons. We
589 * recognize the request to update and record the current
590 * slot then don't transition until that slot is reached
591 * again. If we miss a beacon for that slot then we'll be
592 * slow to transition but we'll be sure at least one beacon
593 * interval has passed. When bursting slot is always left
594 * set to ATH_BCBUF so this check is a noop.
597 if (sc
->sc_updateslot
== UPDATE
) {
598 sc
->sc_updateslot
= COMMIT
; /* commit next beacon */
599 sc
->sc_slotupdate
= slot
;
600 } else if (sc
->sc_updateslot
== COMMIT
&& sc
->sc_slotupdate
== slot
)
601 ath_setslottime(sc
); /* commit change to hardware */
605 * Stop any current dma and put the new frame(s) on the queue.
606 * This should never fail since we check above that no frames
607 * are still pending on the queue.
609 if (!ath9k_hw_stoptxdma(ah
, sc
->sc_bhalq
)) {
610 DPRINTF(sc
, ATH_DBG_FATAL
,
611 "%s: beacon queue %u did not stop?\n",
612 __func__
, sc
->sc_bhalq
);
613 /* NB: the HAL still stops DMA, so proceed */
616 /* NB: cabq traffic should already be queued and primed */
617 ath9k_hw_puttxbuf(ah
, sc
->sc_bhalq
, bfaddr
);
618 ath9k_hw_txstart(ah
, sc
->sc_bhalq
);
620 sc
->ast_be_xmit
+= bc
; /* XXX per-vap? */
625 * Tasklet for Beacon Stuck processing
627 * Processing for Beacon Stuck.
628 * Basically resets the chip.
630 void ath_bstuck_process(struct ath_softc
*sc
)
632 DPRINTF(sc
, ATH_DBG_BEACON
,
633 "%s: stuck beacon; resetting (bmiss count %u)\n",
634 __func__
, sc
->sc_bmisscount
);
635 ath_reset(sc
, false);
639 * Configure the beacon and sleep timers.
641 * When operating as an AP this resets the TSF and sets
642 * up the hardware to notify us when we need to issue beacons.
644 * When operating in station mode this sets up the beacon
645 * timers according to the timestamp of the last received
646 * beacon and the current TSF, configures PCF and DTIM
647 * handling, programs the sleep registers so the hardware
648 * will wakeup in time to receive beacons, and configures
649 * the beacon miss handling so we'll receive a BMISS
650 * interrupt when we stop seeing beacons from the AP
651 * we've associated with.
653 void ath_beacon_config(struct ath_softc
*sc
, int if_id
)
655 struct ath_hal
*ah
= sc
->sc_ah
;
656 struct ath_beacon_config conf
;
657 enum ath9k_opmode av_opmode
;
658 u32 nexttbtt
, intval
;
660 if (if_id
!= ATH_IF_ID_ANY
)
661 av_opmode
= sc
->sc_vaps
[if_id
]->av_opmode
;
663 av_opmode
= sc
->sc_ah
->ah_opmode
;
665 memset(&conf
, 0, sizeof(struct ath_beacon_config
));
667 conf
.beacon_interval
= sc
->hw
->conf
.beacon_int
?
668 sc
->hw
->conf
.beacon_int
: ATH_DEFAULT_BINTVAL
;
669 conf
.listen_interval
= 1;
670 conf
.dtim_period
= conf
.beacon_interval
;
672 conf
.bmiss_timeout
= ATH_DEFAULT_BMISS_LIMIT
* conf
.beacon_interval
;
674 /* extract tstamp from last beacon and convert to TU */
675 nexttbtt
= TSF_TO_TU(sc
->bc_tstamp
>> 32, sc
->bc_tstamp
);
677 /* XXX conditionalize multi-bss support? */
678 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_HOSTAP
) {
680 * For multi-bss ap support beacons are either staggered
681 * evenly over N slots or burst together. For the former
682 * arrange for the SWBA to be delivered for each slot.
683 * Slots that are not occupied will generate nothing.
685 /* NB: the beacon interval is kept internally in TU's */
686 intval
= conf
.beacon_interval
& ATH9K_BEACON_PERIOD
;
687 intval
/= ATH_BCBUF
; /* for staggered beacons */
689 intval
= conf
.beacon_interval
& ATH9K_BEACON_PERIOD
;
692 if (nexttbtt
== 0) /* e.g. for ap mode */
694 else if (intval
) /* NB: can be 0 for monitor mode */
695 nexttbtt
= roundup(nexttbtt
, intval
);
697 DPRINTF(sc
, ATH_DBG_BEACON
, "%s: nexttbtt %u intval %u (%u)\n",
698 __func__
, nexttbtt
, intval
, conf
.beacon_interval
);
700 /* Check for ATH9K_M_HOSTAP and sc_nostabeacons for WDS client */
701 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_STA
) {
702 struct ath9k_beacon_state bs
;
705 int dtimperiod
, dtimcount
, sleepduration
;
706 int cfpperiod
, cfpcount
;
709 * Setup dtim and cfp parameters according to
710 * last beacon we received (which may be none).
712 dtimperiod
= conf
.dtim_period
;
713 if (dtimperiod
<= 0) /* NB: 0 if not known */
715 dtimcount
= conf
.dtim_count
;
716 if (dtimcount
>= dtimperiod
) /* NB: sanity check */
718 cfpperiod
= 1; /* NB: no PCF support yet */
721 sleepduration
= conf
.listen_interval
* intval
;
722 if (sleepduration
<= 0)
723 sleepduration
= intval
;
727 * Pull nexttbtt forward to reflect the current
728 * TSF and calculate dtim+cfp state for the result.
730 tsf
= ath9k_hw_gettsf64(ah
);
731 tsftu
= TSF_TO_TU(tsf
>>32, tsf
) + FUDGE
;
734 if (--dtimcount
< 0) {
735 dtimcount
= dtimperiod
- 1;
737 cfpcount
= cfpperiod
- 1;
739 } while (nexttbtt
< tsftu
);
741 memset(&bs
, 0, sizeof(bs
));
742 bs
.bs_intval
= intval
;
743 bs
.bs_nexttbtt
= nexttbtt
;
744 bs
.bs_dtimperiod
= dtimperiod
*intval
;
745 bs
.bs_nextdtim
= bs
.bs_nexttbtt
+ dtimcount
*intval
;
746 bs
.bs_cfpperiod
= cfpperiod
*bs
.bs_dtimperiod
;
747 bs
.bs_cfpnext
= bs
.bs_nextdtim
+ cfpcount
*bs
.bs_dtimperiod
;
748 bs
.bs_cfpmaxduration
= 0;
751 * Calculate the number of consecutive beacons to miss
752 * before taking a BMISS interrupt. The configuration
753 * is specified in TU so we only need calculate based
754 * on the beacon interval. Note that we clamp the
755 * result to at most 15 beacons.
757 if (sleepduration
> intval
) {
758 bs
.bs_bmissthreshold
= conf
.listen_interval
*
759 ATH_DEFAULT_BMISS_LIMIT
/ 2;
761 bs
.bs_bmissthreshold
=
762 DIV_ROUND_UP(conf
.bmiss_timeout
, intval
);
763 if (bs
.bs_bmissthreshold
> 15)
764 bs
.bs_bmissthreshold
= 15;
765 else if (bs
.bs_bmissthreshold
<= 0)
766 bs
.bs_bmissthreshold
= 1;
770 * Calculate sleep duration. The configuration is
771 * given in ms. We insure a multiple of the beacon
772 * period is used. Also, if the sleep duration is
773 * greater than the DTIM period then it makes senses
774 * to make it a multiple of that.
779 bs
.bs_sleepduration
= roundup(IEEE80211_MS_TO_TU(100),
781 if (bs
.bs_sleepduration
> bs
.bs_dtimperiod
)
782 bs
.bs_sleepduration
= bs
.bs_dtimperiod
;
784 DPRINTF(sc
, ATH_DBG_BEACON
,
798 (unsigned long long)tsf
, tsftu
,
803 bs
.bs_bmissthreshold
,
806 bs
.bs_cfpmaxduration
,
811 ath9k_hw_set_interrupts(ah
, 0);
812 ath9k_hw_set_sta_beacon_timers(ah
, &bs
);
813 sc
->sc_imask
|= ATH9K_INT_BMISS
;
814 ath9k_hw_set_interrupts(ah
, sc
->sc_imask
);
818 ath9k_hw_set_interrupts(ah
, 0);
819 if (nexttbtt
== intval
)
820 intval
|= ATH9K_BEACON_RESET_TSF
;
821 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_IBSS
) {
823 * Pull nexttbtt forward to reflect the current
827 if (!(intval
& ATH9K_BEACON_RESET_TSF
)) {
828 tsf
= ath9k_hw_gettsf64(ah
);
829 tsftu
= TSF_TO_TU((u32
)(tsf
>>32),
833 } while (nexttbtt
< tsftu
);
836 DPRINTF(sc
, ATH_DBG_BEACON
,
837 "%s: IBSS nexttbtt %u intval %u (%u)\n",
839 intval
& ~ATH9K_BEACON_RESET_TSF
,
840 conf
.beacon_interval
);
843 * In IBSS mode enable the beacon timers but only
844 * enable SWBA interrupts if we need to manually
845 * prepare beacon frames. Otherwise we use a
846 * self-linked tx descriptor and let the hardware
849 intval
|= ATH9K_BEACON_ENA
;
850 if (!(ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
))
851 sc
->sc_imask
|= ATH9K_INT_SWBA
;
852 ath_beaconq_config(sc
);
853 } else if (sc
->sc_ah
->ah_opmode
== ATH9K_M_HOSTAP
) {
855 * In AP mode we enable the beacon timers and
856 * SWBA interrupts to prepare beacon frames.
858 intval
|= ATH9K_BEACON_ENA
;
859 sc
->sc_imask
|= ATH9K_INT_SWBA
; /* beacon prepare */
860 ath_beaconq_config(sc
);
862 ath9k_hw_beaconinit(ah
, nexttbtt
, intval
);
863 sc
->sc_bmisscount
= 0;
864 ath9k_hw_set_interrupts(ah
, sc
->sc_imask
);
866 * When using a self-linked beacon descriptor in
867 * ibss mode load it once here.
869 if (sc
->sc_ah
->ah_opmode
== ATH9K_M_IBSS
&&
870 (ah
->ah_caps
.hw_caps
& ATH9K_HW_CAP_VEOL
))
871 ath_beacon_start_adhoc(sc
, 0);
875 /* Function to collect beacon rssi data and resync beacon if necessary */
877 void ath_beacon_sync(struct ath_softc
*sc
, int if_id
)
880 * Resync beacon timers using the tsf of the
881 * beacon frame we just received.
883 ath_beacon_config(sc
, if_id
);
884 sc
->sc_flags
|= SC_OP_BEACONS
;