2 * Copyright (c) 2010 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.
21 void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
23 struct ath_hw *ah = priv->ah;
24 struct ath9k_tx_queue_info qi, qi_be;
26 memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
27 memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
29 ath9k_hw_get_txq_props(ah, priv->beaconq, &qi);
31 if (priv->ah->opmode == NL80211_IFTYPE_AP) {
35 } else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {
36 int qnum = priv->hwq_map[WME_AC_BE];
38 ath9k_hw_get_txq_props(ah, qnum, &qi_be);
40 qi.tqi_aifs = qi_be.tqi_aifs;
43 * For WIFI Beacon Distribution
44 * Long slot time : 2x cwmin
45 * Short slot time : 4x cwmin
47 if (ah->slottime == ATH9K_SLOT_TIME_20)
48 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
50 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
52 qi.tqi_cwmax = qi_be.tqi_cwmax;
56 if (!ath9k_hw_set_txq_props(ah, priv->beaconq, &qi)) {
57 ath_err(ath9k_hw_common(ah),
58 "Unable to update beacon queue %u!\n", priv->beaconq);
60 ath9k_hw_resettxqueue(ah, priv->beaconq);
65 static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
66 struct htc_beacon_config *bss_conf)
68 struct ath_common *common = ath9k_hw_common(priv->ah);
69 struct ath9k_beacon_state bs;
70 enum ath9k_int imask = 0;
71 int dtimperiod, dtimcount, sleepduration;
72 int cfpperiod, cfpcount, bmiss_timeout;
73 u32 nexttbtt = 0, intval, tsftu;
76 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
80 memset(&bs, 0, sizeof(bs));
82 intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
83 bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
86 * Setup dtim and cfp parameters according to
87 * last beacon we received (which may be none).
89 dtimperiod = bss_conf->dtim_period;
90 if (dtimperiod <= 0) /* NB: 0 if not known */
93 if (dtimcount >= dtimperiod) /* NB: sanity check */
95 cfpperiod = 1; /* NB: no PCF support yet */
98 sleepduration = intval;
99 if (sleepduration <= 0)
100 sleepduration = intval;
103 * Pull nexttbtt forward to reflect the current
104 * TSF and calculate dtim+cfp state for the result.
106 tsf = ath9k_hw_gettsf64(priv->ah);
107 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
109 num_beacons = tsftu / intval + 1;
110 offset = tsftu % intval;
111 nexttbtt = tsftu - offset;
115 /* DTIM Beacon every dtimperiod Beacon */
116 dtim_dec_count = num_beacons % dtimperiod;
117 /* CFP every cfpperiod DTIM Beacon */
118 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
122 dtimcount -= dtim_dec_count;
124 dtimcount += dtimperiod;
126 cfpcount -= cfp_dec_count;
128 cfpcount += cfpperiod;
130 bs.bs_intval = intval;
131 bs.bs_nexttbtt = nexttbtt;
132 bs.bs_dtimperiod = dtimperiod*intval;
133 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
134 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
135 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
136 bs.bs_cfpmaxduration = 0;
139 * Calculate the number of consecutive beacons to miss* before taking
140 * a BMISS interrupt. The configuration is specified in TU so we only
141 * need calculate based on the beacon interval. Note that we clamp the
142 * result to at most 15 beacons.
144 if (sleepduration > intval) {
145 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
147 bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, intval);
148 if (bs.bs_bmissthreshold > 15)
149 bs.bs_bmissthreshold = 15;
150 else if (bs.bs_bmissthreshold <= 0)
151 bs.bs_bmissthreshold = 1;
155 * Calculate sleep duration. The configuration is given in ms.
156 * We ensure a multiple of the beacon period is used. Also, if the sleep
157 * duration is greater than the DTIM period then it makes senses
158 * to make it a multiple of that.
163 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
164 if (bs.bs_sleepduration > bs.bs_dtimperiod)
165 bs.bs_sleepduration = bs.bs_dtimperiod;
167 /* TSF out of range threshold fixed at 1 second */
168 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
170 ath_dbg(common, ATH_DBG_CONFIG, "intval: %u tsf: %llu tsftu: %u\n",
172 ath_dbg(common, ATH_DBG_CONFIG,
173 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
174 bs.bs_bmissthreshold, bs.bs_sleepduration,
175 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
177 /* Set the computed STA beacon timers */
179 WMI_CMD(WMI_DISABLE_INTR_CMDID);
180 ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
181 imask |= ATH9K_INT_BMISS;
182 htc_imask = cpu_to_be32(imask);
183 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
186 static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
187 struct htc_beacon_config *bss_conf)
189 struct ath_common *common = ath9k_hw_common(priv->ah);
190 enum ath9k_int imask = 0;
191 u32 nexttbtt, intval, tsftu;
192 __be32 htc_imask = 0;
197 intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
198 intval /= ATH9K_HTC_MAX_BCN_VIF;
202 * To reduce beacon misses under heavy TX load,
203 * set the beacon response time to a larger value.
205 if (intval > DEFAULT_SWBA_RESPONSE)
206 priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
208 priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
210 if (priv->op_flags & OP_TSF_RESET) {
211 ath9k_hw_reset_tsf(priv->ah);
212 priv->op_flags &= ~OP_TSF_RESET;
215 * Pull nexttbtt forward to reflect the current TSF.
217 tsf = ath9k_hw_gettsf64(priv->ah);
218 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
221 } while (nexttbtt < tsftu);
224 if (priv->op_flags & OP_ENABLE_BEACON)
225 imask |= ATH9K_INT_SWBA;
227 ath_dbg(common, ATH_DBG_CONFIG,
228 "AP Beacon config, intval: %d, nexttbtt: %u, resp_time: %d "
230 bss_conf->beacon_interval, nexttbtt,
231 priv->ah->config.sw_beacon_response_time, imask);
233 ath9k_htc_beaconq_config(priv);
235 WMI_CMD(WMI_DISABLE_INTR_CMDID);
236 ath9k_hw_beaconinit(priv->ah, TU_TO_USEC(nexttbtt), TU_TO_USEC(intval));
237 priv->cur_beacon_conf.bmiss_cnt = 0;
238 htc_imask = cpu_to_be32(imask);
239 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
242 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
243 struct htc_beacon_config *bss_conf)
245 struct ath_common *common = ath9k_hw_common(priv->ah);
246 enum ath9k_int imask = 0;
247 u32 nexttbtt, intval, tsftu;
248 __be32 htc_imask = 0;
253 intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
257 * Pull nexttbtt forward to reflect the current TSF.
259 tsf = ath9k_hw_gettsf64(priv->ah);
260 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
263 } while (nexttbtt < tsftu);
266 * Only one IBSS interfce is allowed.
268 if (intval > DEFAULT_SWBA_RESPONSE)
269 priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
271 priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
273 if (priv->op_flags & OP_ENABLE_BEACON)
274 imask |= ATH9K_INT_SWBA;
276 ath_dbg(common, ATH_DBG_CONFIG,
277 "IBSS Beacon config, intval: %d, nexttbtt: %u, "
278 "resp_time: %d, imask: 0x%x\n",
279 bss_conf->beacon_interval, nexttbtt,
280 priv->ah->config.sw_beacon_response_time, imask);
282 WMI_CMD(WMI_DISABLE_INTR_CMDID);
283 ath9k_hw_beaconinit(priv->ah, TU_TO_USEC(nexttbtt), TU_TO_USEC(intval));
284 priv->cur_beacon_conf.bmiss_cnt = 0;
285 htc_imask = cpu_to_be32(imask);
286 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
289 void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
290 enum htc_endpoint_id ep_id, bool txok)
292 dev_kfree_skb_any(skb);
295 static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
298 struct ath_common *common = ath9k_hw_common(priv->ah);
299 struct ieee80211_vif *vif;
301 struct ieee80211_hdr *hdr;
302 int padpos, padsize, ret;
304 spin_lock_bh(&priv->beacon_lock);
306 vif = priv->cur_beacon_conf.bslot[slot];
308 skb = ieee80211_get_buffered_bc(priv->hw, vif);
311 hdr = (struct ieee80211_hdr *) skb->data;
313 padpos = ath9k_cmn_padpos(hdr->frame_control);
314 padsize = padpos & 3;
315 if (padsize && skb->len > padpos) {
316 if (skb_headroom(skb) < padsize) {
317 dev_kfree_skb_any(skb);
320 skb_push(skb, padsize);
321 memmove(skb->data, skb->data + padsize, padpos);
324 ret = ath9k_htc_tx_start(priv, skb, true);
326 ath_dbg(common, ATH_DBG_FATAL,
327 "Failed to send CAB frame\n");
328 dev_kfree_skb_any(skb);
331 skb = ieee80211_get_buffered_bc(priv->hw, vif);
334 spin_unlock_bh(&priv->beacon_lock);
337 static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
340 struct ath_common *common = ath9k_hw_common(priv->ah);
341 struct ieee80211_vif *vif;
342 struct ath9k_htc_vif *avp;
343 struct tx_beacon_header beacon_hdr;
344 struct ath9k_htc_tx_ctl *tx_ctl;
345 struct ieee80211_tx_info *info;
346 struct ieee80211_mgmt *mgmt;
347 struct sk_buff *beacon;
351 memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
353 spin_lock_bh(&priv->beacon_lock);
355 vif = priv->cur_beacon_conf.bslot[slot];
356 avp = (struct ath9k_htc_vif *)vif->drv_priv;
358 if (unlikely(priv->op_flags & OP_SCANNING)) {
359 spin_unlock_bh(&priv->beacon_lock);
363 /* Get a new beacon */
364 beacon = ieee80211_beacon_get(priv->hw, vif);
366 spin_unlock_bh(&priv->beacon_lock);
371 * Update the TSF adjust value here, the HW will
372 * add this value for every beacon.
374 mgmt = (struct ieee80211_mgmt *)beacon->data;
375 mgmt->u.beacon.timestamp = avp->tsfadjust;
377 info = IEEE80211_SKB_CB(beacon);
378 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
379 struct ieee80211_hdr *hdr =
380 (struct ieee80211_hdr *) beacon->data;
382 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
383 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
386 tx_ctl = HTC_SKB_CB(beacon);
387 memset(tx_ctl, 0, sizeof(*tx_ctl));
389 tx_ctl->type = ATH9K_HTC_BEACON;
391 beacon_hdr.vif_index = avp->index;
392 tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
393 memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
395 ret = htc_send(priv->htc, beacon, priv->beacon_ep);
397 if (ret == -ENOMEM) {
398 ath_dbg(common, ATH_DBG_BSTUCK,
399 "Failed to send beacon, no free TX buffer\n");
401 dev_kfree_skb_any(beacon);
404 spin_unlock_bh(&priv->beacon_lock);
407 static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
408 struct wmi_event_swba *swba)
410 struct ath_common *common = ath9k_hw_common(priv->ah);
416 intval = priv->cur_beacon_conf.beacon_interval & ATH9K_BEACON_PERIOD;
418 tsf = be64_to_cpu(swba->tsf);
419 tsftu = TSF_TO_TU(tsf >> 32, tsf);
420 slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
421 slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
423 ath_dbg(common, ATH_DBG_BEACON,
424 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
425 slot, tsf, tsftu, intval);
430 void ath9k_htc_swba(struct ath9k_htc_priv *priv,
431 struct wmi_event_swba *swba)
433 struct ath_common *common = ath9k_hw_common(priv->ah);
436 if (swba->beacon_pending != 0) {
437 priv->cur_beacon_conf.bmiss_cnt++;
438 if (priv->cur_beacon_conf.bmiss_cnt > BSTUCK_THRESHOLD) {
439 ath_dbg(common, ATH_DBG_BSTUCK,
440 "Beacon stuck, HW reset\n");
441 ieee80211_queue_work(priv->hw,
447 if (priv->cur_beacon_conf.bmiss_cnt) {
448 ath_dbg(common, ATH_DBG_BSTUCK,
449 "Resuming beacon xmit after %u misses\n",
450 priv->cur_beacon_conf.bmiss_cnt);
451 priv->cur_beacon_conf.bmiss_cnt = 0;
454 slot = ath9k_htc_choose_bslot(priv, swba);
455 spin_lock_bh(&priv->beacon_lock);
456 if (priv->cur_beacon_conf.bslot[slot] == NULL) {
457 spin_unlock_bh(&priv->beacon_lock);
460 spin_unlock_bh(&priv->beacon_lock);
462 ath9k_htc_send_buffered(priv, slot);
463 ath9k_htc_send_beacon(priv, slot);
466 void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
467 struct ieee80211_vif *vif)
469 struct ath_common *common = ath9k_hw_common(priv->ah);
470 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
473 spin_lock_bh(&priv->beacon_lock);
474 for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
475 if (priv->cur_beacon_conf.bslot[i] == NULL) {
481 priv->cur_beacon_conf.bslot[avp->bslot] = vif;
482 spin_unlock_bh(&priv->beacon_lock);
484 ath_dbg(common, ATH_DBG_CONFIG,
485 "Added interface at beacon slot: %d\n", avp->bslot);
488 void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
489 struct ieee80211_vif *vif)
491 struct ath_common *common = ath9k_hw_common(priv->ah);
492 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
494 spin_lock_bh(&priv->beacon_lock);
495 priv->cur_beacon_conf.bslot[avp->bslot] = NULL;
496 spin_unlock_bh(&priv->beacon_lock);
498 ath_dbg(common, ATH_DBG_CONFIG,
499 "Removed interface at beacon slot: %d\n", avp->bslot);
503 * Calculate the TSF adjustment value for all slots
506 void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
507 struct ieee80211_vif *vif)
509 struct ath_common *common = ath9k_hw_common(priv->ah);
510 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
511 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
518 * The beacon interval cannot be different for multi-AP mode,
519 * and we reach here only for VIF slots greater than zero,
520 * so beacon_interval is guaranteed to be set in cur_conf.
522 tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
523 avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
525 ath_dbg(common, ATH_DBG_CONFIG,
526 "tsfadjust is: %llu for bslot: %d\n",
527 (unsigned long long)tsfadjust, avp->bslot);
530 static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
532 bool *beacon_configured = (bool *)data;
533 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
535 if (vif->type == NL80211_IFTYPE_STATION &&
536 avp->beacon_configured)
537 *beacon_configured = true;
540 static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
541 struct ieee80211_vif *vif)
543 struct ath_common *common = ath9k_hw_common(priv->ah);
544 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
545 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
546 bool beacon_configured;
549 * Changing the beacon interval when multiple AP interfaces
550 * are configured will affect beacon transmission of all
553 if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
554 (priv->num_ap_vif > 1) &&
555 (vif->type == NL80211_IFTYPE_AP) &&
556 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
557 ath_dbg(common, ATH_DBG_CONFIG,
558 "Changing beacon interval of multiple AP interfaces !\n");
563 * If the HW is operating in AP mode, any new station interfaces that
564 * are added cannot change the beacon parameters.
566 if (priv->num_ap_vif &&
567 (vif->type != NL80211_IFTYPE_AP)) {
568 ath_dbg(common, ATH_DBG_CONFIG,
569 "HW in AP mode, cannot set STA beacon parameters\n");
574 * The beacon parameters are configured only for the first
577 if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
578 (priv->num_sta_vif > 1) &&
579 (vif->type == NL80211_IFTYPE_STATION)) {
580 beacon_configured = false;
581 ieee80211_iterate_active_interfaces_atomic(priv->hw,
582 ath9k_htc_beacon_iter,
585 if (beacon_configured) {
586 ath_dbg(common, ATH_DBG_CONFIG,
587 "Beacon already configured for a station interface\n");
595 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
596 struct ieee80211_vif *vif)
598 struct ath_common *common = ath9k_hw_common(priv->ah);
599 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
600 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
601 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
603 if (!ath9k_htc_check_beacon_config(priv, vif))
606 cur_conf->beacon_interval = bss_conf->beacon_int;
607 if (cur_conf->beacon_interval == 0)
608 cur_conf->beacon_interval = 100;
610 cur_conf->dtim_period = bss_conf->dtim_period;
611 cur_conf->bmiss_timeout =
612 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
615 case NL80211_IFTYPE_STATION:
616 ath9k_htc_beacon_config_sta(priv, cur_conf);
617 avp->beacon_configured = true;
619 case NL80211_IFTYPE_ADHOC:
620 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
622 case NL80211_IFTYPE_AP:
623 ath9k_htc_beacon_config_ap(priv, cur_conf);
626 ath_dbg(common, ATH_DBG_CONFIG,
627 "Unsupported beaconing mode\n");
632 void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
634 struct ath_common *common = ath9k_hw_common(priv->ah);
635 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
637 switch (priv->ah->opmode) {
638 case NL80211_IFTYPE_STATION:
639 ath9k_htc_beacon_config_sta(priv, cur_conf);
641 case NL80211_IFTYPE_ADHOC:
642 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
644 case NL80211_IFTYPE_AP:
645 ath9k_htc_beacon_config_ap(priv, cur_conf);
648 ath_dbg(common, ATH_DBG_CONFIG,
649 "Unsupported beaconing mode\n");