2 * Copyright (c) 2008-2009 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.
22 * This function will modify certain transmit queue properties depending on
23 * the operating mode of the station (AP or AdHoc). Parameters are AIFS
24 * settings and channel width min/max
26 int ath_beaconq_config(struct ath_softc
*sc
)
28 struct ath_hw
*ah
= sc
->sc_ah
;
29 struct ath_common
*common
= ath9k_hw_common(ah
);
30 struct ath9k_tx_queue_info qi
, qi_be
;
33 ath9k_hw_get_txq_props(ah
, sc
->beacon
.beaconq
, &qi
);
34 if (sc
->sc_ah
->opmode
== NL80211_IFTYPE_AP
) {
35 /* Always burst out beacon and CAB traffic. */
40 /* Adhoc mode; important thing is to use 2x cwmin. */
41 txq
= sc
->tx
.txq_map
[WME_AC_BE
];
42 ath9k_hw_get_txq_props(ah
, txq
->axq_qnum
, &qi_be
);
43 qi
.tqi_aifs
= qi_be
.tqi_aifs
;
44 qi
.tqi_cwmin
= 4*qi_be
.tqi_cwmin
;
45 qi
.tqi_cwmax
= qi_be
.tqi_cwmax
;
48 if (!ath9k_hw_set_txq_props(ah
, sc
->beacon
.beaconq
, &qi
)) {
50 "Unable to update h/w beacon queue parameters\n");
53 ath9k_hw_resettxqueue(ah
, sc
->beacon
.beaconq
);
59 * Associates the beacon frame buffer with a transmit descriptor. Will set
60 * up rate codes, and channel flags. Beacons are always sent out at the
61 * lowest rate, and are not retried.
63 static void ath_beacon_setup(struct ath_softc
*sc
, struct ath_vif
*avp
,
64 struct ath_buf
*bf
, int rateidx
)
66 struct sk_buff
*skb
= bf
->bf_mpdu
;
67 struct ath_hw
*ah
= sc
->sc_ah
;
68 struct ath_common
*common
= ath9k_hw_common(ah
);
70 struct ath9k_11n_rate_series series
[4];
71 int flags
, ctsrate
= 0, ctsduration
= 0;
72 struct ieee80211_supported_band
*sband
;
76 flags
= ATH9K_TXDESC_NOACK
;
80 sband
= &sc
->sbands
[common
->hw
->conf
.channel
->band
];
81 rate
= sband
->bitrates
[rateidx
].hw_value
;
82 if (sc
->sc_flags
& SC_OP_PREAMBLE_SHORT
)
83 rate
|= sband
->bitrates
[rateidx
].hw_value_short
;
85 ath9k_hw_set11n_txdesc(ah
, ds
, skb
->len
+ FCS_LEN
,
86 ATH9K_PKT_TYPE_BEACON
,
88 ATH9K_TXKEYIX_INVALID
,
92 /* NB: beacon's BufLen must be a multiple of 4 bytes */
93 ath9k_hw_filltxdesc(ah
, ds
, roundup(skb
->len
, 4),
94 true, true, ds
, bf
->bf_buf_addr
,
97 memset(series
, 0, sizeof(struct ath9k_11n_rate_series
) * 4);
99 series
[0].Rate
= rate
;
100 series
[0].ChSel
= ath_txchainmask_reduction(sc
,
101 common
->tx_chainmask
, series
[0].Rate
);
102 series
[0].RateFlags
= (ctsrate
) ? ATH9K_RATESERIES_RTS_CTS
: 0;
103 ath9k_hw_set11n_ratescenario(ah
, ds
, ds
, 0, ctsrate
, ctsduration
,
107 static void ath_tx_cabq(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
109 struct ath_softc
*sc
= hw
->priv
;
110 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
111 struct ath_tx_control txctl
;
113 memset(&txctl
, 0, sizeof(struct ath_tx_control
));
114 txctl
.txq
= sc
->beacon
.cabq
;
116 ath_dbg(common
, ATH_DBG_XMIT
,
117 "transmitting CABQ packet, skb: %p\n", skb
);
119 if (ath_tx_start(hw
, skb
, &txctl
) != 0) {
120 ath_dbg(common
, ATH_DBG_XMIT
, "CABQ TX failed\n");
121 dev_kfree_skb_any(skb
);
125 static struct ath_buf
*ath_beacon_generate(struct ieee80211_hw
*hw
,
126 struct ieee80211_vif
*vif
)
128 struct ath_softc
*sc
= hw
->priv
;
129 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
133 struct ath_txq
*cabq
;
134 struct ieee80211_tx_info
*info
;
137 avp
= (void *)vif
->drv_priv
;
138 cabq
= sc
->beacon
.cabq
;
140 if ((avp
->av_bcbuf
== NULL
) || !avp
->is_bslot_active
)
143 /* Release the old beacon first */
148 dma_unmap_single(sc
->dev
, bf
->bf_buf_addr
,
149 skb
->len
, DMA_TO_DEVICE
);
150 dev_kfree_skb_any(skb
);
154 /* Get a new beacon from mac80211 */
156 skb
= ieee80211_beacon_get(hw
, vif
);
160 ((struct ieee80211_mgmt
*)skb
->data
)->u
.beacon
.timestamp
=
163 info
= IEEE80211_SKB_CB(skb
);
164 if (info
->flags
& IEEE80211_TX_CTL_ASSIGN_SEQ
) {
166 * TODO: make sure the seq# gets assigned properly (vs. other
169 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
170 sc
->tx
.seq_no
+= 0x10;
171 hdr
->seq_ctrl
&= cpu_to_le16(IEEE80211_SCTL_FRAG
);
172 hdr
->seq_ctrl
|= cpu_to_le16(sc
->tx
.seq_no
);
175 bf
->bf_buf_addr
= dma_map_single(sc
->dev
, skb
->data
,
176 skb
->len
, DMA_TO_DEVICE
);
177 if (unlikely(dma_mapping_error(sc
->dev
, bf
->bf_buf_addr
))) {
178 dev_kfree_skb_any(skb
);
181 ath_err(common
, "dma_mapping_error on beaconing\n");
185 skb
= ieee80211_get_buffered_bc(hw
, vif
);
188 * if the CABQ traffic from previous DTIM is pending and the current
189 * beacon is also a DTIM.
190 * 1) if there is only one vif let the cab traffic continue.
191 * 2) if there are more than one vif and we are using staggered
192 * beacons, then drain the cabq by dropping all the frames in
193 * the cabq so that the current vifs cab traffic can be scheduled.
195 spin_lock_bh(&cabq
->axq_lock
);
196 cabq_depth
= cabq
->axq_depth
;
197 spin_unlock_bh(&cabq
->axq_lock
);
199 if (skb
&& cabq_depth
) {
201 ath_dbg(common
, ATH_DBG_BEACON
,
202 "Flushing previous cabq traffic\n");
203 ath_draintxq(sc
, cabq
, false);
207 ath_beacon_setup(sc
, avp
, bf
, info
->control
.rates
[0].idx
);
210 ath_tx_cabq(hw
, skb
);
211 skb
= ieee80211_get_buffered_bc(hw
, vif
);
217 int ath_beacon_alloc(struct ath_softc
*sc
, struct ieee80211_vif
*vif
)
219 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
223 struct ath_beacon_config
*cur_conf
= &sc
->cur_beacon_conf
;
226 avp
= (void *)vif
->drv_priv
;
228 /* Allocate a beacon descriptor if we haven't done so. */
229 if (!avp
->av_bcbuf
) {
230 /* Allocate beacon state for hostap/ibss. We know
231 * a buffer is available. */
232 avp
->av_bcbuf
= list_first_entry(&sc
->beacon
.bbuf
,
233 struct ath_buf
, list
);
234 list_del(&avp
->av_bcbuf
->list
);
236 if (ath9k_uses_beacons(vif
->type
)) {
239 * Assign the vif to a beacon xmit slot. As
240 * above, this cannot fail to find one.
243 for (slot
= 0; slot
< ATH_BCBUF
; slot
++)
244 if (sc
->beacon
.bslot
[slot
] == NULL
) {
245 avp
->av_bslot
= slot
;
246 avp
->is_bslot_active
= false;
248 /* NB: keep looking for a double slot */
249 if (slot
== 0 || !sc
->beacon
.bslot
[slot
-1])
252 BUG_ON(sc
->beacon
.bslot
[avp
->av_bslot
] != NULL
);
253 sc
->beacon
.bslot
[avp
->av_bslot
] = vif
;
258 /* release the previous beacon frame, if it already exists. */
260 if (bf
->bf_mpdu
!= NULL
) {
262 dma_unmap_single(sc
->dev
, bf
->bf_buf_addr
,
263 skb
->len
, DMA_TO_DEVICE
);
264 dev_kfree_skb_any(skb
);
269 /* NB: the beacon data buffer must be 32-bit aligned. */
270 skb
= ieee80211_beacon_get(sc
->hw
, vif
);
274 tstamp
= ((struct ieee80211_mgmt
*)skb
->data
)->u
.beacon
.timestamp
;
275 sc
->beacon
.bc_tstamp
= (u32
) le64_to_cpu(tstamp
);
276 /* Calculate a TSF adjustment factor required for staggered beacons. */
277 if (avp
->av_bslot
> 0) {
281 intval
= cur_conf
->beacon_interval
? : ATH_DEFAULT_BINTVAL
;
284 * Calculate the TSF offset for this beacon slot, i.e., the
285 * number of usecs that need to be added to the timestamp field
286 * in Beacon and Probe Response frames. Beacon slot 0 is
287 * processed at the correct offset, so it does not require TSF
288 * adjustment. Other slots are adjusted to get the timestamp
289 * close to the TBTT for the BSS.
291 tsfadjust
= TU_TO_USEC(intval
* avp
->av_bslot
) / ATH_BCBUF
;
292 avp
->tsf_adjust
= cpu_to_le64(tsfadjust
);
294 ath_dbg(common
, ATH_DBG_BEACON
,
295 "stagger beacons, bslot %d intval %u tsfadjust %llu\n",
296 avp
->av_bslot
, intval
, (unsigned long long)tsfadjust
);
298 ((struct ieee80211_mgmt
*)skb
->data
)->u
.beacon
.timestamp
=
301 avp
->tsf_adjust
= cpu_to_le64(0);
304 bf
->bf_buf_addr
= dma_map_single(sc
->dev
, skb
->data
,
305 skb
->len
, DMA_TO_DEVICE
);
306 if (unlikely(dma_mapping_error(sc
->dev
, bf
->bf_buf_addr
))) {
307 dev_kfree_skb_any(skb
);
310 ath_err(common
, "dma_mapping_error on beacon alloc\n");
313 avp
->is_bslot_active
= true;
318 void ath_beacon_return(struct ath_softc
*sc
, struct ath_vif
*avp
)
320 if (avp
->av_bcbuf
!= NULL
) {
323 if (avp
->av_bslot
!= -1) {
324 sc
->beacon
.bslot
[avp
->av_bslot
] = NULL
;
329 if (bf
->bf_mpdu
!= NULL
) {
330 struct sk_buff
*skb
= bf
->bf_mpdu
;
331 dma_unmap_single(sc
->dev
, bf
->bf_buf_addr
,
332 skb
->len
, DMA_TO_DEVICE
);
333 dev_kfree_skb_any(skb
);
337 list_add_tail(&bf
->list
, &sc
->beacon
.bbuf
);
339 avp
->av_bcbuf
= NULL
;
343 void ath_beacon_tasklet(unsigned long data
)
345 struct ath_softc
*sc
= (struct ath_softc
*)data
;
346 struct ath_beacon_config
*cur_conf
= &sc
->cur_beacon_conf
;
347 struct ath_hw
*ah
= sc
->sc_ah
;
348 struct ath_common
*common
= ath9k_hw_common(ah
);
349 struct ath_buf
*bf
= NULL
;
350 struct ieee80211_vif
*vif
;
352 u32 bfaddr
, bc
= 0, tsftu
;
357 * Check if the previous beacon has gone out. If
358 * not don't try to post another, skip this period
359 * and wait for the next. Missed beacons indicate
360 * a problem and should not occur. If we miss too
361 * many consecutive beacons reset the device.
363 if (ath9k_hw_numtxpending(ah
, sc
->beacon
.beaconq
) != 0) {
364 sc
->beacon
.bmisscnt
++;
366 if (sc
->beacon
.bmisscnt
< BSTUCK_THRESH
* sc
->nbcnvifs
) {
367 ath_dbg(common
, ATH_DBG_BSTUCK
,
368 "missed %u consecutive beacons\n",
369 sc
->beacon
.bmisscnt
);
370 ath9k_hw_stop_dma_queue(ah
, sc
->beacon
.beaconq
);
371 if (sc
->beacon
.bmisscnt
> 3)
372 ath9k_hw_bstuck_nfcal(ah
);
373 } else if (sc
->beacon
.bmisscnt
>= BSTUCK_THRESH
) {
374 ath_dbg(common
, ATH_DBG_BSTUCK
,
375 "beacon is officially stuck\n");
376 sc
->sc_flags
|= SC_OP_TSF_RESET
;
384 * Generate beacon frames. we are sending frames
385 * staggered so calculate the slot for this frame based
386 * on the tsf to safeguard against missing an swba.
389 intval
= cur_conf
->beacon_interval
? : ATH_DEFAULT_BINTVAL
;
391 tsf
= ath9k_hw_gettsf64(ah
);
392 tsf
+= TU_TO_USEC(ah
->config
.sw_beacon_response_time
);
393 tsftu
= TSF_TO_TU((tsf
* ATH_BCBUF
) >>32, tsf
* ATH_BCBUF
);
394 slot
= (tsftu
% (intval
* ATH_BCBUF
)) / intval
;
395 vif
= sc
->beacon
.bslot
[slot
];
397 ath_dbg(common
, ATH_DBG_BEACON
,
398 "slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
399 slot
, tsf
, tsftu
/ ATH_BCBUF
, intval
, vif
);
403 bf
= ath_beacon_generate(sc
->hw
, vif
);
405 bfaddr
= bf
->bf_daddr
;
409 if (sc
->beacon
.bmisscnt
!= 0) {
410 ath_dbg(common
, ATH_DBG_BSTUCK
,
411 "resume beacon xmit after %u misses\n",
412 sc
->beacon
.bmisscnt
);
413 sc
->beacon
.bmisscnt
= 0;
418 * Handle slot time change when a non-ERP station joins/leaves
419 * an 11g network. The 802.11 layer notifies us via callback,
420 * we mark updateslot, then wait one beacon before effecting
421 * the change. This gives associated stations at least one
422 * beacon interval to note the state change.
424 * NB: The slot time change state machine is clocked according
425 * to whether we are bursting or staggering beacons. We
426 * recognize the request to update and record the current
427 * slot then don't transition until that slot is reached
428 * again. If we miss a beacon for that slot then we'll be
429 * slow to transition but we'll be sure at least one beacon
430 * interval has passed. When bursting slot is always left
431 * set to ATH_BCBUF so this check is a noop.
433 if (sc
->beacon
.updateslot
== UPDATE
) {
434 sc
->beacon
.updateslot
= COMMIT
; /* commit next beacon */
435 sc
->beacon
.slotupdate
= slot
;
436 } else if (sc
->beacon
.updateslot
== COMMIT
&& sc
->beacon
.slotupdate
== slot
) {
437 ah
->slottime
= sc
->beacon
.slottime
;
438 ath9k_hw_init_global_settings(ah
);
439 sc
->beacon
.updateslot
= OK
;
442 /* NB: cabq traffic should already be queued and primed */
443 ath9k_hw_puttxbuf(ah
, sc
->beacon
.beaconq
, bfaddr
);
444 ath9k_hw_txstart(ah
, sc
->beacon
.beaconq
);
446 sc
->beacon
.ast_be_xmit
+= bc
; /* XXX per-vif? */
450 static void ath9k_beacon_init(struct ath_softc
*sc
,
454 if (sc
->sc_flags
& SC_OP_TSF_RESET
) {
456 ath9k_hw_reset_tsf(sc
->sc_ah
);
459 ath9k_hw_beaconinit(sc
->sc_ah
, next_beacon
, beacon_period
);
461 if (sc
->sc_flags
& SC_OP_TSF_RESET
) {
462 ath9k_ps_restore(sc
);
463 sc
->sc_flags
&= ~SC_OP_TSF_RESET
;
468 * For multi-bss ap support beacons are either staggered evenly over N slots or
469 * burst together. For the former arrange for the SWBA to be delivered for each
470 * slot. Slots that are not occupied will generate nothing.
472 static void ath_beacon_config_ap(struct ath_softc
*sc
,
473 struct ath_beacon_config
*conf
)
475 struct ath_hw
*ah
= sc
->sc_ah
;
476 u32 nexttbtt
, intval
;
478 /* NB: the beacon interval is kept internally in TU's */
479 intval
= TU_TO_USEC(conf
->beacon_interval
& ATH9K_BEACON_PERIOD
);
480 intval
/= ATH_BCBUF
; /* for staggered beacons */
484 * In AP mode we enable the beacon timers and SWBA interrupts to
485 * prepare beacon frames.
487 ah
->imask
|= ATH9K_INT_SWBA
;
488 ath_beaconq_config(sc
);
490 /* Set the computed AP beacon timers */
492 ath9k_hw_disable_interrupts(ah
);
493 ath9k_beacon_init(sc
, nexttbtt
, intval
);
494 sc
->beacon
.bmisscnt
= 0;
495 ath9k_hw_set_interrupts(ah
, ah
->imask
);
499 * This sets up the beacon timers according to the timestamp of the last
500 * received beacon and the current TSF, configures PCF and DTIM
501 * handling, programs the sleep registers so the hardware will wakeup in
502 * time to receive beacons, and configures the beacon miss handling so
503 * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
504 * we've associated with.
506 static void ath_beacon_config_sta(struct ath_softc
*sc
,
507 struct ath_beacon_config
*conf
)
509 struct ath_hw
*ah
= sc
->sc_ah
;
510 struct ath_common
*common
= ath9k_hw_common(ah
);
511 struct ath9k_beacon_state bs
;
512 int dtimperiod
, dtimcount
, sleepduration
;
513 int cfpperiod
, cfpcount
;
514 u32 nexttbtt
= 0, intval
, tsftu
;
516 int num_beacons
, offset
, dtim_dec_count
, cfp_dec_count
;
518 /* No need to configure beacon if we are not associated */
519 if (!common
->curaid
) {
520 ath_dbg(common
, ATH_DBG_BEACON
,
521 "STA is not yet associated..skipping beacon config\n");
525 memset(&bs
, 0, sizeof(bs
));
526 intval
= conf
->beacon_interval
& ATH9K_BEACON_PERIOD
;
529 * Setup dtim and cfp parameters according to
530 * last beacon we received (which may be none).
532 dtimperiod
= conf
->dtim_period
;
533 dtimcount
= conf
->dtim_count
;
534 if (dtimcount
>= dtimperiod
) /* NB: sanity check */
536 cfpperiod
= 1; /* NB: no PCF support yet */
539 sleepduration
= conf
->listen_interval
* intval
;
542 * Pull nexttbtt forward to reflect the current
543 * TSF and calculate dtim+cfp state for the result.
545 tsf
= ath9k_hw_gettsf64(ah
);
546 tsftu
= TSF_TO_TU(tsf
>>32, tsf
) + FUDGE
;
548 num_beacons
= tsftu
/ intval
+ 1;
549 offset
= tsftu
% intval
;
550 nexttbtt
= tsftu
- offset
;
554 /* DTIM Beacon every dtimperiod Beacon */
555 dtim_dec_count
= num_beacons
% dtimperiod
;
556 /* CFP every cfpperiod DTIM Beacon */
557 cfp_dec_count
= (num_beacons
/ dtimperiod
) % cfpperiod
;
561 dtimcount
-= dtim_dec_count
;
563 dtimcount
+= dtimperiod
;
565 cfpcount
-= cfp_dec_count
;
567 cfpcount
+= cfpperiod
;
569 bs
.bs_intval
= intval
;
570 bs
.bs_nexttbtt
= nexttbtt
;
571 bs
.bs_dtimperiod
= dtimperiod
*intval
;
572 bs
.bs_nextdtim
= bs
.bs_nexttbtt
+ dtimcount
*intval
;
573 bs
.bs_cfpperiod
= cfpperiod
*bs
.bs_dtimperiod
;
574 bs
.bs_cfpnext
= bs
.bs_nextdtim
+ cfpcount
*bs
.bs_dtimperiod
;
575 bs
.bs_cfpmaxduration
= 0;
578 * Calculate the number of consecutive beacons to miss* before taking
579 * a BMISS interrupt. The configuration is specified in TU so we only
580 * need calculate based on the beacon interval. Note that we clamp the
581 * result to at most 15 beacons.
583 if (sleepduration
> intval
) {
584 bs
.bs_bmissthreshold
= conf
->listen_interval
*
585 ATH_DEFAULT_BMISS_LIMIT
/ 2;
587 bs
.bs_bmissthreshold
= DIV_ROUND_UP(conf
->bmiss_timeout
, intval
);
588 if (bs
.bs_bmissthreshold
> 15)
589 bs
.bs_bmissthreshold
= 15;
590 else if (bs
.bs_bmissthreshold
<= 0)
591 bs
.bs_bmissthreshold
= 1;
595 * Calculate sleep duration. The configuration is given in ms.
596 * We ensure a multiple of the beacon period is used. Also, if the sleep
597 * duration is greater than the DTIM period then it makes senses
598 * to make it a multiple of that.
603 bs
.bs_sleepduration
= roundup(IEEE80211_MS_TO_TU(100), sleepduration
);
604 if (bs
.bs_sleepduration
> bs
.bs_dtimperiod
)
605 bs
.bs_sleepduration
= bs
.bs_dtimperiod
;
607 /* TSF out of range threshold fixed at 1 second */
608 bs
.bs_tsfoor_threshold
= ATH9K_TSFOOR_THRESHOLD
;
610 ath_dbg(common
, ATH_DBG_BEACON
, "tsf: %llu tsftu: %u\n", tsf
, tsftu
);
611 ath_dbg(common
, ATH_DBG_BEACON
,
612 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
613 bs
.bs_bmissthreshold
, bs
.bs_sleepduration
,
614 bs
.bs_cfpperiod
, bs
.bs_cfpmaxduration
, bs
.bs_cfpnext
);
616 /* Set the computed STA beacon timers */
618 ath9k_hw_disable_interrupts(ah
);
619 ath9k_hw_set_sta_beacon_timers(ah
, &bs
);
620 ah
->imask
|= ATH9K_INT_BMISS
;
621 ath9k_hw_set_interrupts(ah
, ah
->imask
);
624 static void ath_beacon_config_adhoc(struct ath_softc
*sc
,
625 struct ath_beacon_config
*conf
)
627 struct ath_hw
*ah
= sc
->sc_ah
;
628 struct ath_common
*common
= ath9k_hw_common(ah
);
629 u32 tsf
, delta
, intval
, nexttbtt
;
631 tsf
= ath9k_hw_gettsf32(ah
) + TU_TO_USEC(FUDGE
);
632 intval
= TU_TO_USEC(conf
->beacon_interval
& ATH9K_BEACON_PERIOD
);
634 if (!sc
->beacon
.bc_tstamp
)
635 nexttbtt
= tsf
+ intval
;
637 if (tsf
> sc
->beacon
.bc_tstamp
)
638 delta
= (tsf
- sc
->beacon
.bc_tstamp
);
640 delta
= (tsf
+ 1 + (~0U - sc
->beacon
.bc_tstamp
));
641 nexttbtt
= tsf
+ roundup(delta
, intval
);
644 ath_dbg(common
, ATH_DBG_BEACON
,
645 "IBSS nexttbtt %u intval %u (%u)\n",
646 nexttbtt
, intval
, conf
->beacon_interval
);
649 * In IBSS mode enable the beacon timers but only enable SWBA interrupts
650 * if we need to manually prepare beacon frames. Otherwise we use a
651 * self-linked tx descriptor and let the hardware deal with things.
653 ah
->imask
|= ATH9K_INT_SWBA
;
655 ath_beaconq_config(sc
);
657 /* Set the computed ADHOC beacon timers */
659 ath9k_hw_disable_interrupts(ah
);
660 ath9k_beacon_init(sc
, nexttbtt
, intval
);
661 sc
->beacon
.bmisscnt
= 0;
662 ath9k_hw_set_interrupts(ah
, ah
->imask
);
665 void ath_beacon_config(struct ath_softc
*sc
, struct ieee80211_vif
*vif
)
667 struct ath_beacon_config
*cur_conf
= &sc
->cur_beacon_conf
;
668 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
669 enum nl80211_iftype iftype
;
671 /* Setup the beacon configuration parameters */
673 struct ieee80211_bss_conf
*bss_conf
= &vif
->bss_conf
;
675 cur_conf
->beacon_interval
= bss_conf
->beacon_int
;
676 cur_conf
->dtim_period
= bss_conf
->dtim_period
;
678 iftype
= sc
->sc_ah
->opmode
;
681 cur_conf
->listen_interval
= 1;
682 cur_conf
->dtim_count
= 1;
683 cur_conf
->bmiss_timeout
=
684 ATH_DEFAULT_BMISS_LIMIT
* cur_conf
->beacon_interval
;
687 * It looks like mac80211 may end up using beacon interval of zero in
688 * some cases (at least for mesh point). Avoid getting into an
689 * infinite loop by using a bit safer value instead. To be safe,
690 * do sanity check on beacon interval for all operating modes.
692 if (cur_conf
->beacon_interval
== 0)
693 cur_conf
->beacon_interval
= 100;
696 * We don't parse dtim period from mac80211 during the driver
697 * initialization as it breaks association with hidden-ssid
698 * AP and it causes latency in roaming
700 if (cur_conf
->dtim_period
== 0)
701 cur_conf
->dtim_period
= 1;
704 case NL80211_IFTYPE_AP
:
705 ath_beacon_config_ap(sc
, cur_conf
);
707 case NL80211_IFTYPE_ADHOC
:
708 case NL80211_IFTYPE_MESH_POINT
:
709 ath_beacon_config_adhoc(sc
, cur_conf
);
711 case NL80211_IFTYPE_STATION
:
712 ath_beacon_config_sta(sc
, cur_conf
);
715 ath_dbg(common
, ATH_DBG_CONFIG
,
716 "Unsupported beaconing mode\n");
720 sc
->sc_flags
|= SC_OP_BEACONS
;
723 void ath9k_set_beaconing_status(struct ath_softc
*sc
, bool status
)
725 struct ath_hw
*ah
= sc
->sc_ah
;
732 for (slot
= 0; slot
< ATH_BCBUF
; slot
++) {
733 if (sc
->beacon
.bslot
[slot
]) {
734 avp
= (void *)sc
->beacon
.bslot
[slot
]->drv_priv
;
735 if (avp
->is_bslot_active
) {
742 /* Re-enable beaconing */
743 ah
->imask
|= ATH9K_INT_SWBA
;
744 ath9k_hw_set_interrupts(ah
, ah
->imask
);
747 /* Disable SWBA interrupt */
748 ah
->imask
&= ~ATH9K_INT_SWBA
;
749 ath9k_hw_set_interrupts(ah
, ah
->imask
);
750 tasklet_kill(&sc
->bcon_tasklet
);
751 ath9k_hw_stop_dma_queue(ah
, sc
->beacon
.beaconq
);
753 ath9k_ps_restore(sc
);