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1/*
2 * Copyright (c) 2010-2011 Atheros Communications Inc.
3 *
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.
7 *
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.
15 */
16
17#include "htc.h"
18
19#define FUDGE 2
20
21void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
22{
23 struct ath_hw *ah = priv->ah;
24 struct ath9k_tx_queue_info qi, qi_be;
25
26 memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
27 memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
28
29 ath9k_hw_get_txq_props(ah, priv->beaconq, &qi);
30
31 if (priv->ah->opmode == NL80211_IFTYPE_AP) {
32 qi.tqi_aifs = 1;
33 qi.tqi_cwmin = 0;
34 qi.tqi_cwmax = 0;
35 } else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {
36 int qnum = priv->hwq_map[WME_AC_BE];
37
38 ath9k_hw_get_txq_props(ah, qnum, &qi_be);
39
40 qi.tqi_aifs = qi_be.tqi_aifs;
41
42 /*
43 * For WIFI Beacon Distribution
44 * Long slot time : 2x cwmin
45 * Short slot time : 4x cwmin
46 */
47 if (ah->slottime == ATH9K_SLOT_TIME_20)
48 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
49 else
50 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
51
52 qi.tqi_cwmax = qi_be.tqi_cwmax;
53
54 }
55
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);
59 } else {
60 ath9k_hw_resettxqueue(ah, priv->beaconq);
61 }
62}
63
64
65static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
66 struct htc_beacon_config *bss_conf)
67{
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;
74 __be32 htc_imask = 0;
75 u64 tsf;
76 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
77 int ret __attribute__ ((unused));
78 u8 cmd_rsp;
79
80 memset(&bs, 0, sizeof(bs));
81
82 intval = bss_conf->beacon_interval;
83 bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
84
85 /*
86 * Setup dtim and cfp parameters according to
87 * last beacon we received (which may be none).
88 */
89 dtimperiod = bss_conf->dtim_period;
90 if (dtimperiod <= 0) /* NB: 0 if not known */
91 dtimperiod = 1;
92 dtimcount = 1;
93 if (dtimcount >= dtimperiod) /* NB: sanity check */
94 dtimcount = 0;
95 cfpperiod = 1; /* NB: no PCF support yet */
96 cfpcount = 0;
97
98 sleepduration = intval;
99 if (sleepduration <= 0)
100 sleepduration = intval;
101
102 /*
103 * Pull nexttbtt forward to reflect the current
104 * TSF and calculate dtim+cfp state for the result.
105 */
106 tsf = ath9k_hw_gettsf64(priv->ah);
107 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
108
109 num_beacons = tsftu / intval + 1;
110 offset = tsftu % intval;
111 nexttbtt = tsftu - offset;
112 if (offset)
113 nexttbtt += intval;
114
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;
119 if (dtim_dec_count)
120 cfp_dec_count++;
121
122 dtimcount -= dtim_dec_count;
123 if (dtimcount < 0)
124 dtimcount += dtimperiod;
125
126 cfpcount -= cfp_dec_count;
127 if (cfpcount < 0)
128 cfpcount += cfpperiod;
129
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;
137
138 /*
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.
143 */
144 if (sleepduration > intval) {
145 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
146 } else {
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;
152 }
153
154 /*
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.
159 *
160 * XXX fixed at 100ms
161 */
162
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;
166
167 /* TSF out of range threshold fixed at 1 second */
168 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
169
170 ath_dbg(common, ATH_DBG_CONFIG, "intval: %u tsf: %llu tsftu: %u\n",
171 intval, tsf, tsftu);
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);
176
177 /* Set the computed STA beacon timers */
178
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);
184}
185
186static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
187 struct htc_beacon_config *bss_conf)
188{
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;
193 int ret __attribute__ ((unused));
194 u8 cmd_rsp;
195 u64 tsf;
196
197 intval = bss_conf->beacon_interval;
198 intval /= ATH9K_HTC_MAX_BCN_VIF;
199 nexttbtt = intval;
200
201 /*
202 * To reduce beacon misses under heavy TX load,
203 * set the beacon response time to a larger value.
204 */
205 if (intval > DEFAULT_SWBA_RESPONSE)
206 priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
207 else
208 priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
209
210 if (priv->op_flags & OP_TSF_RESET) {
211 ath9k_hw_reset_tsf(priv->ah);
212 priv->op_flags &= ~OP_TSF_RESET;
213 } else {
214 /*
215 * Pull nexttbtt forward to reflect the current TSF.
216 */
217 tsf = ath9k_hw_gettsf64(priv->ah);
218 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
219 do {
220 nexttbtt += intval;
221 } while (nexttbtt < tsftu);
222 }
223
224 if (priv->op_flags & OP_ENABLE_BEACON)
225 imask |= ATH9K_INT_SWBA;
226
227 ath_dbg(common, ATH_DBG_CONFIG,
228 "AP Beacon config, intval: %d, nexttbtt: %u, resp_time: %d "
229 "imask: 0x%x\n",
230 bss_conf->beacon_interval, nexttbtt,
231 priv->ah->config.sw_beacon_response_time, imask);
232
233 ath9k_htc_beaconq_config(priv);
234
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);
240}
241
242static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
243 struct htc_beacon_config *bss_conf)
244{
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;
249 int ret __attribute__ ((unused));
250 u8 cmd_rsp;
251 u64 tsf;
252
253 intval = bss_conf->beacon_interval;
254 nexttbtt = intval;
255
256 /*
257 * Pull nexttbtt forward to reflect the current TSF.
258 */
259 tsf = ath9k_hw_gettsf64(priv->ah);
260 tsftu = TSF_TO_TU(tsf >> 32, tsf) + FUDGE;
261 do {
262 nexttbtt += intval;
263 } while (nexttbtt < tsftu);
264
265 /*
266 * Only one IBSS interfce is allowed.
267 */
268 if (intval > DEFAULT_SWBA_RESPONSE)
269 priv->ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
270 else
271 priv->ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
272
273 if (priv->op_flags & OP_ENABLE_BEACON)
274 imask |= ATH9K_INT_SWBA;
275
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);
281
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);
287}
288
289void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
290 enum htc_endpoint_id ep_id, bool txok)
291{
292 dev_kfree_skb_any(skb);
293}
294
295static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
296 int slot)
297{
298 struct ath_common *common = ath9k_hw_common(priv->ah);
299 struct ieee80211_vif *vif;
300 struct sk_buff *skb;
301 struct ieee80211_hdr *hdr;
302 int padpos, padsize, ret, tx_slot;
303
304 spin_lock_bh(&priv->beacon_lock);
305
306 vif = priv->cur_beacon_conf.bslot[slot];
307
308 skb = ieee80211_get_buffered_bc(priv->hw, vif);
309
310 while(skb) {
311 hdr = (struct ieee80211_hdr *) skb->data;
312
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);
318 goto next;
319 }
320 skb_push(skb, padsize);
321 memmove(skb->data, skb->data + padsize, padpos);
322 }
323
324 tx_slot = ath9k_htc_tx_get_slot(priv);
325 if (tx_slot < 0) {
326 ath_dbg(common, ATH_DBG_XMIT, "No free CAB slot\n");
327 dev_kfree_skb_any(skb);
328 goto next;
329 }
330
331 ret = ath9k_htc_tx_start(priv, skb, tx_slot, true);
332 if (ret != 0) {
333 ath9k_htc_tx_clear_slot(priv, tx_slot);
334 dev_kfree_skb_any(skb);
335
336 ath_dbg(common, ATH_DBG_XMIT,
337 "Failed to send CAB frame\n");
338 } else {
339 spin_lock_bh(&priv->tx.tx_lock);
340 priv->tx.queued_cnt++;
341 spin_unlock_bh(&priv->tx.tx_lock);
342 }
343 next:
344 skb = ieee80211_get_buffered_bc(priv->hw, vif);
345 }
346
347 spin_unlock_bh(&priv->beacon_lock);
348}
349
350static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
351 int slot)
352{
353 struct ath_common *common = ath9k_hw_common(priv->ah);
354 struct ieee80211_vif *vif;
355 struct ath9k_htc_vif *avp;
356 struct tx_beacon_header beacon_hdr;
357 struct ath9k_htc_tx_ctl *tx_ctl;
358 struct ieee80211_tx_info *info;
359 struct ieee80211_mgmt *mgmt;
360 struct sk_buff *beacon;
361 u8 *tx_fhdr;
362 int ret;
363
364 memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
365
366 spin_lock_bh(&priv->beacon_lock);
367
368 vif = priv->cur_beacon_conf.bslot[slot];
369 avp = (struct ath9k_htc_vif *)vif->drv_priv;
370
371 if (unlikely(priv->op_flags & OP_SCANNING)) {
372 spin_unlock_bh(&priv->beacon_lock);
373 return;
374 }
375
376 /* Get a new beacon */
377 beacon = ieee80211_beacon_get(priv->hw, vif);
378 if (!beacon) {
379 spin_unlock_bh(&priv->beacon_lock);
380 return;
381 }
382
383 /*
384 * Update the TSF adjust value here, the HW will
385 * add this value for every beacon.
386 */
387 mgmt = (struct ieee80211_mgmt *)beacon->data;
388 mgmt->u.beacon.timestamp = avp->tsfadjust;
389
390 info = IEEE80211_SKB_CB(beacon);
391 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
392 struct ieee80211_hdr *hdr =
393 (struct ieee80211_hdr *) beacon->data;
394 avp->seq_no += 0x10;
395 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
396 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
397 }
398
399 tx_ctl = HTC_SKB_CB(beacon);
400 memset(tx_ctl, 0, sizeof(*tx_ctl));
401
402 tx_ctl->type = ATH9K_HTC_BEACON;
403 tx_ctl->epid = priv->beacon_ep;
404
405 beacon_hdr.vif_index = avp->index;
406 tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
407 memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
408
409 ret = htc_send(priv->htc, beacon);
410 if (ret != 0) {
411 if (ret == -ENOMEM) {
412 ath_dbg(common, ATH_DBG_BSTUCK,
413 "Failed to send beacon, no free TX buffer\n");
414 }
415 dev_kfree_skb_any(beacon);
416 }
417
418 spin_unlock_bh(&priv->beacon_lock);
419}
420
421static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
422 struct wmi_event_swba *swba)
423{
424 struct ath_common *common = ath9k_hw_common(priv->ah);
425 u64 tsf;
426 u32 tsftu;
427 u16 intval;
428 int slot;
429
430 intval = priv->cur_beacon_conf.beacon_interval;
431
432 tsf = be64_to_cpu(swba->tsf);
433 tsftu = TSF_TO_TU(tsf >> 32, tsf);
434 slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
435 slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
436
437 ath_dbg(common, ATH_DBG_BEACON,
438 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
439 slot, tsf, tsftu, intval);
440
441 return slot;
442}
443
444void ath9k_htc_swba(struct ath9k_htc_priv *priv,
445 struct wmi_event_swba *swba)
446{
447 struct ath_common *common = ath9k_hw_common(priv->ah);
448 int slot;
449
450 if (swba->beacon_pending != 0) {
451 priv->cur_beacon_conf.bmiss_cnt++;
452 if (priv->cur_beacon_conf.bmiss_cnt > BSTUCK_THRESHOLD) {
453 ath_dbg(common, ATH_DBG_BSTUCK,
454 "Beacon stuck, HW reset\n");
455 ieee80211_queue_work(priv->hw,
456 &priv->fatal_work);
457 }
458 return;
459 }
460
461 if (priv->cur_beacon_conf.bmiss_cnt) {
462 ath_dbg(common, ATH_DBG_BSTUCK,
463 "Resuming beacon xmit after %u misses\n",
464 priv->cur_beacon_conf.bmiss_cnt);
465 priv->cur_beacon_conf.bmiss_cnt = 0;
466 }
467
468 slot = ath9k_htc_choose_bslot(priv, swba);
469 spin_lock_bh(&priv->beacon_lock);
470 if (priv->cur_beacon_conf.bslot[slot] == NULL) {
471 spin_unlock_bh(&priv->beacon_lock);
472 return;
473 }
474 spin_unlock_bh(&priv->beacon_lock);
475
476 ath9k_htc_send_buffered(priv, slot);
477 ath9k_htc_send_beacon(priv, slot);
478}
479
480void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
481 struct ieee80211_vif *vif)
482{
483 struct ath_common *common = ath9k_hw_common(priv->ah);
484 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
485 int i = 0;
486
487 spin_lock_bh(&priv->beacon_lock);
488 for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
489 if (priv->cur_beacon_conf.bslot[i] == NULL) {
490 avp->bslot = i;
491 break;
492 }
493 }
494
495 priv->cur_beacon_conf.bslot[avp->bslot] = vif;
496 spin_unlock_bh(&priv->beacon_lock);
497
498 ath_dbg(common, ATH_DBG_CONFIG,
499 "Added interface at beacon slot: %d\n", avp->bslot);
500}
501
502void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
503 struct ieee80211_vif *vif)
504{
505 struct ath_common *common = ath9k_hw_common(priv->ah);
506 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
507
508 spin_lock_bh(&priv->beacon_lock);
509 priv->cur_beacon_conf.bslot[avp->bslot] = NULL;
510 spin_unlock_bh(&priv->beacon_lock);
511
512 ath_dbg(common, ATH_DBG_CONFIG,
513 "Removed interface at beacon slot: %d\n", avp->bslot);
514}
515
516/*
517 * Calculate the TSF adjustment value for all slots
518 * other than zero.
519 */
520void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
521 struct ieee80211_vif *vif)
522{
523 struct ath_common *common = ath9k_hw_common(priv->ah);
524 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
525 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
526 u64 tsfadjust;
527
528 if (avp->bslot == 0)
529 return;
530
531 /*
532 * The beacon interval cannot be different for multi-AP mode,
533 * and we reach here only for VIF slots greater than zero,
534 * so beacon_interval is guaranteed to be set in cur_conf.
535 */
536 tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
537 avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
538
539 ath_dbg(common, ATH_DBG_CONFIG,
540 "tsfadjust is: %llu for bslot: %d\n",
541 (unsigned long long)tsfadjust, avp->bslot);
542}
543
544static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
545{
546 bool *beacon_configured = (bool *)data;
547 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
548
549 if (vif->type == NL80211_IFTYPE_STATION &&
550 avp->beacon_configured)
551 *beacon_configured = true;
552}
553
554static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
555 struct ieee80211_vif *vif)
556{
557 struct ath_common *common = ath9k_hw_common(priv->ah);
558 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
559 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
560 bool beacon_configured;
561
562 /*
563 * Changing the beacon interval when multiple AP interfaces
564 * are configured will affect beacon transmission of all
565 * of them.
566 */
567 if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
568 (priv->num_ap_vif > 1) &&
569 (vif->type == NL80211_IFTYPE_AP) &&
570 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
571 ath_dbg(common, ATH_DBG_CONFIG,
572 "Changing beacon interval of multiple AP interfaces !\n");
573 return false;
574 }
575
576 /*
577 * If the HW is operating in AP mode, any new station interfaces that
578 * are added cannot change the beacon parameters.
579 */
580 if (priv->num_ap_vif &&
581 (vif->type != NL80211_IFTYPE_AP)) {
582 ath_dbg(common, ATH_DBG_CONFIG,
583 "HW in AP mode, cannot set STA beacon parameters\n");
584 return false;
585 }
586
587 /*
588 * The beacon parameters are configured only for the first
589 * station interface.
590 */
591 if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
592 (priv->num_sta_vif > 1) &&
593 (vif->type == NL80211_IFTYPE_STATION)) {
594 beacon_configured = false;
595 ieee80211_iterate_active_interfaces_atomic(priv->hw,
596 ath9k_htc_beacon_iter,
597 &beacon_configured);
598
599 if (beacon_configured) {
600 ath_dbg(common, ATH_DBG_CONFIG,
601 "Beacon already configured for a station interface\n");
602 return false;
603 }
604 }
605
606 return true;
607}
608
609void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
610 struct ieee80211_vif *vif)
611{
612 struct ath_common *common = ath9k_hw_common(priv->ah);
613 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
614 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
615 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
616
617 if (!ath9k_htc_check_beacon_config(priv, vif))
618 return;
619
620 cur_conf->beacon_interval = bss_conf->beacon_int;
621 if (cur_conf->beacon_interval == 0)
622 cur_conf->beacon_interval = 100;
623
624 cur_conf->dtim_period = bss_conf->dtim_period;
625 cur_conf->bmiss_timeout =
626 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
627
628 switch (vif->type) {
629 case NL80211_IFTYPE_STATION:
630 ath9k_htc_beacon_config_sta(priv, cur_conf);
631 avp->beacon_configured = true;
632 break;
633 case NL80211_IFTYPE_ADHOC:
634 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
635 break;
636 case NL80211_IFTYPE_AP:
637 ath9k_htc_beacon_config_ap(priv, cur_conf);
638 break;
639 default:
640 ath_dbg(common, ATH_DBG_CONFIG,
641 "Unsupported beaconing mode\n");
642 return;
643 }
644}
645
646void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
647{
648 struct ath_common *common = ath9k_hw_common(priv->ah);
649 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
650
651 switch (priv->ah->opmode) {
652 case NL80211_IFTYPE_STATION:
653 ath9k_htc_beacon_config_sta(priv, cur_conf);
654 break;
655 case NL80211_IFTYPE_ADHOC:
656 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
657 break;
658 case NL80211_IFTYPE_AP:
659 ath9k_htc_beacon_config_ap(priv, cur_conf);
660 break;
661 default:
662 ath_dbg(common, ATH_DBG_CONFIG,
663 "Unsupported beaconing mode\n");
664 return;
665 }
666}
1/*
2 * Copyright (c) 2010-2011 Atheros Communications Inc.
3 *
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.
7 *
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.
15 */
16
17#include "htc.h"
18
19#define FUDGE 2
20
21void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
22{
23 struct ath_hw *ah = priv->ah;
24 struct ath9k_tx_queue_info qi, qi_be;
25
26 memset(&qi, 0, sizeof(struct ath9k_tx_queue_info));
27 memset(&qi_be, 0, sizeof(struct ath9k_tx_queue_info));
28
29 ath9k_hw_get_txq_props(ah, priv->beacon.beaconq, &qi);
30
31 if (priv->ah->opmode == NL80211_IFTYPE_AP ||
32 priv->ah->opmode == NL80211_IFTYPE_MESH_POINT) {
33 qi.tqi_aifs = 1;
34 qi.tqi_cwmin = 0;
35 qi.tqi_cwmax = 0;
36 } else if (priv->ah->opmode == NL80211_IFTYPE_ADHOC) {
37 int qnum = priv->hwq_map[IEEE80211_AC_BE];
38
39 ath9k_hw_get_txq_props(ah, qnum, &qi_be);
40
41 qi.tqi_aifs = qi_be.tqi_aifs;
42
43 /*
44 * For WIFI Beacon Distribution
45 * Long slot time : 2x cwmin
46 * Short slot time : 4x cwmin
47 */
48 if (ah->slottime == 20)
49 qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
50 else
51 qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
52
53 qi.tqi_cwmax = qi_be.tqi_cwmax;
54
55 }
56
57 if (!ath9k_hw_set_txq_props(ah, priv->beacon.beaconq, &qi)) {
58 ath_err(ath9k_hw_common(ah),
59 "Unable to update beacon queue %u!\n", priv->beacon.beaconq);
60 } else {
61 ath9k_hw_resettxqueue(ah, priv->beacon.beaconq);
62 }
63}
64
65/*
66 * Both nexttbtt and intval have to be in usecs.
67 */
68static void ath9k_htc_beacon_init(struct ath9k_htc_priv *priv,
69 struct ath_beacon_config *conf,
70 bool reset_tsf)
71{
72 struct ath_hw *ah = priv->ah;
73 int ret __attribute__ ((unused));
74 __be32 htc_imask = 0;
75 u8 cmd_rsp;
76
77 if (conf->intval >= TU_TO_USEC(DEFAULT_SWBA_RESPONSE))
78 ah->config.sw_beacon_response_time = DEFAULT_SWBA_RESPONSE;
79 else
80 ah->config.sw_beacon_response_time = MIN_SWBA_RESPONSE;
81
82 WMI_CMD(WMI_DISABLE_INTR_CMDID);
83 if (reset_tsf)
84 ath9k_hw_reset_tsf(ah);
85 ath9k_htc_beaconq_config(priv);
86 ath9k_hw_beaconinit(ah, conf->nexttbtt, conf->intval);
87 priv->beacon.bmisscnt = 0;
88 htc_imask = cpu_to_be32(ah->imask);
89 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
90}
91
92static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
93 struct ath_beacon_config *bss_conf)
94{
95 struct ath9k_beacon_state bs;
96 enum ath9k_int imask = 0;
97 __be32 htc_imask = 0;
98 int ret __attribute__ ((unused));
99 u8 cmd_rsp;
100
101 if (ath9k_cmn_beacon_config_sta(priv->ah, bss_conf, &bs) == -EPERM)
102 return;
103
104 WMI_CMD(WMI_DISABLE_INTR_CMDID);
105 ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
106 imask |= ATH9K_INT_BMISS;
107 htc_imask = cpu_to_be32(imask);
108 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
109}
110
111static void ath9k_htc_beacon_config_ap(struct ath9k_htc_priv *priv,
112 struct ath_beacon_config *conf)
113{
114 struct ath_hw *ah = priv->ah;
115 ah->imask = 0;
116
117 ath9k_cmn_beacon_config_ap(ah, conf, ATH9K_HTC_MAX_BCN_VIF);
118 ath9k_htc_beacon_init(priv, conf, false);
119}
120
121static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
122 struct ath_beacon_config *conf)
123{
124 struct ath_hw *ah = priv->ah;
125 ah->imask = 0;
126
127 ath9k_cmn_beacon_config_adhoc(ah, conf);
128 ath9k_htc_beacon_init(priv, conf, conf->ibss_creator);
129}
130
131void ath9k_htc_beaconep(void *drv_priv, struct sk_buff *skb,
132 enum htc_endpoint_id ep_id, bool txok)
133{
134 dev_kfree_skb_any(skb);
135}
136
137static void ath9k_htc_send_buffered(struct ath9k_htc_priv *priv,
138 int slot)
139{
140 struct ath_common *common = ath9k_hw_common(priv->ah);
141 struct ieee80211_vif *vif;
142 struct sk_buff *skb;
143 struct ieee80211_hdr *hdr;
144 int padpos, padsize, ret, tx_slot;
145
146 spin_lock_bh(&priv->beacon_lock);
147
148 vif = priv->beacon.bslot[slot];
149
150 skb = ieee80211_get_buffered_bc(priv->hw, vif);
151
152 while(skb) {
153 hdr = (struct ieee80211_hdr *) skb->data;
154
155 padpos = ieee80211_hdrlen(hdr->frame_control);
156 padsize = padpos & 3;
157 if (padsize && skb->len > padpos) {
158 if (skb_headroom(skb) < padsize) {
159 dev_kfree_skb_any(skb);
160 goto next;
161 }
162 skb_push(skb, padsize);
163 memmove(skb->data, skb->data + padsize, padpos);
164 }
165
166 tx_slot = ath9k_htc_tx_get_slot(priv);
167 if (tx_slot < 0) {
168 ath_dbg(common, XMIT, "No free CAB slot\n");
169 dev_kfree_skb_any(skb);
170 goto next;
171 }
172
173 ret = ath9k_htc_tx_start(priv, NULL, skb, tx_slot, true);
174 if (ret != 0) {
175 ath9k_htc_tx_clear_slot(priv, tx_slot);
176 dev_kfree_skb_any(skb);
177
178 ath_dbg(common, XMIT, "Failed to send CAB frame\n");
179 } else {
180 spin_lock_bh(&priv->tx.tx_lock);
181 priv->tx.queued_cnt++;
182 spin_unlock_bh(&priv->tx.tx_lock);
183 }
184 next:
185 skb = ieee80211_get_buffered_bc(priv->hw, vif);
186 }
187
188 spin_unlock_bh(&priv->beacon_lock);
189}
190
191static void ath9k_htc_send_beacon(struct ath9k_htc_priv *priv,
192 int slot)
193{
194 struct ath_common *common = ath9k_hw_common(priv->ah);
195 struct ieee80211_vif *vif;
196 struct ath9k_htc_vif *avp;
197 struct tx_beacon_header beacon_hdr;
198 struct ath9k_htc_tx_ctl *tx_ctl;
199 struct ieee80211_tx_info *info;
200 struct ieee80211_mgmt *mgmt;
201 struct sk_buff *beacon;
202 u8 *tx_fhdr;
203 int ret;
204
205 memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
206
207 spin_lock_bh(&priv->beacon_lock);
208
209 vif = priv->beacon.bslot[slot];
210 avp = (struct ath9k_htc_vif *)vif->drv_priv;
211
212 if (unlikely(test_bit(ATH_OP_SCANNING, &common->op_flags))) {
213 spin_unlock_bh(&priv->beacon_lock);
214 return;
215 }
216
217 /* Get a new beacon */
218 beacon = ieee80211_beacon_get(priv->hw, vif);
219 if (!beacon) {
220 spin_unlock_bh(&priv->beacon_lock);
221 return;
222 }
223
224 /*
225 * Update the TSF adjust value here, the HW will
226 * add this value for every beacon.
227 */
228 mgmt = (struct ieee80211_mgmt *)beacon->data;
229 mgmt->u.beacon.timestamp = avp->tsfadjust;
230
231 info = IEEE80211_SKB_CB(beacon);
232 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
233 struct ieee80211_hdr *hdr =
234 (struct ieee80211_hdr *) beacon->data;
235 avp->seq_no += 0x10;
236 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
237 hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
238 }
239
240 tx_ctl = HTC_SKB_CB(beacon);
241 memset(tx_ctl, 0, sizeof(*tx_ctl));
242
243 tx_ctl->type = ATH9K_HTC_BEACON;
244 tx_ctl->epid = priv->beacon_ep;
245
246 beacon_hdr.vif_index = avp->index;
247 tx_fhdr = skb_push(beacon, sizeof(beacon_hdr));
248 memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
249
250 ret = htc_send(priv->htc, beacon);
251 if (ret != 0) {
252 if (ret == -ENOMEM) {
253 ath_dbg(common, BSTUCK,
254 "Failed to send beacon, no free TX buffer\n");
255 }
256 dev_kfree_skb_any(beacon);
257 }
258
259 spin_unlock_bh(&priv->beacon_lock);
260
261 ath9k_htc_csa_is_finished(priv);
262}
263
264static int ath9k_htc_choose_bslot(struct ath9k_htc_priv *priv,
265 struct wmi_event_swba *swba)
266{
267 struct ath_common *common = ath9k_hw_common(priv->ah);
268 u64 tsf;
269 u32 tsftu;
270 u16 intval;
271 int slot;
272
273 intval = priv->cur_beacon_conf.beacon_interval;
274
275 tsf = be64_to_cpu(swba->tsf);
276 tsftu = TSF_TO_TU(tsf >> 32, tsf);
277 slot = ((tsftu % intval) * ATH9K_HTC_MAX_BCN_VIF) / intval;
278 slot = ATH9K_HTC_MAX_BCN_VIF - slot - 1;
279
280 ath_dbg(common, BEACON,
281 "Choose slot: %d, tsf: %llu, tsftu: %u, intval: %u\n",
282 slot, tsf, tsftu, intval);
283
284 return slot;
285}
286
287void ath9k_htc_swba(struct ath9k_htc_priv *priv,
288 struct wmi_event_swba *swba)
289{
290 struct ath_common *common = ath9k_hw_common(priv->ah);
291 int slot;
292
293 if (swba->beacon_pending != 0) {
294 priv->beacon.bmisscnt++;
295 if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {
296 ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");
297 ieee80211_queue_work(priv->hw,
298 &priv->fatal_work);
299 }
300 return;
301 }
302
303 if (priv->beacon.bmisscnt) {
304 ath_dbg(common, BSTUCK,
305 "Resuming beacon xmit after %u misses\n",
306 priv->beacon.bmisscnt);
307 priv->beacon.bmisscnt = 0;
308 }
309
310 slot = ath9k_htc_choose_bslot(priv, swba);
311 spin_lock_bh(&priv->beacon_lock);
312 if (priv->beacon.bslot[slot] == NULL) {
313 spin_unlock_bh(&priv->beacon_lock);
314 return;
315 }
316 spin_unlock_bh(&priv->beacon_lock);
317
318 ath9k_htc_send_buffered(priv, slot);
319 ath9k_htc_send_beacon(priv, slot);
320}
321
322void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
323 struct ieee80211_vif *vif)
324{
325 struct ath_common *common = ath9k_hw_common(priv->ah);
326 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
327 int i = 0;
328
329 spin_lock_bh(&priv->beacon_lock);
330 for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
331 if (priv->beacon.bslot[i] == NULL) {
332 avp->bslot = i;
333 break;
334 }
335 }
336
337 priv->beacon.bslot[avp->bslot] = vif;
338 spin_unlock_bh(&priv->beacon_lock);
339
340 ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
341 avp->bslot);
342}
343
344void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
345 struct ieee80211_vif *vif)
346{
347 struct ath_common *common = ath9k_hw_common(priv->ah);
348 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
349
350 spin_lock_bh(&priv->beacon_lock);
351 priv->beacon.bslot[avp->bslot] = NULL;
352 spin_unlock_bh(&priv->beacon_lock);
353
354 ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",
355 avp->bslot);
356}
357
358/*
359 * Calculate the TSF adjustment value for all slots
360 * other than zero.
361 */
362void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
363 struct ieee80211_vif *vif)
364{
365 struct ath_common *common = ath9k_hw_common(priv->ah);
366 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
367 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
368 u64 tsfadjust;
369
370 if (avp->bslot == 0)
371 return;
372
373 /*
374 * The beacon interval cannot be different for multi-AP mode,
375 * and we reach here only for VIF slots greater than zero,
376 * so beacon_interval is guaranteed to be set in cur_conf.
377 */
378 tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
379 avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
380
381 ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
382 (unsigned long long)tsfadjust, avp->bslot);
383}
384
385static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
386{
387 bool *beacon_configured = data;
388 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
389
390 if (vif->type == NL80211_IFTYPE_STATION &&
391 avp->beacon_configured)
392 *beacon_configured = true;
393}
394
395static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
396 struct ieee80211_vif *vif)
397{
398 struct ath_common *common = ath9k_hw_common(priv->ah);
399 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
400 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
401 bool beacon_configured;
402
403 /*
404 * Changing the beacon interval when multiple AP interfaces
405 * are configured will affect beacon transmission of all
406 * of them.
407 */
408 if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
409 (priv->num_ap_vif > 1) &&
410 (vif->type == NL80211_IFTYPE_AP) &&
411 (cur_conf->beacon_interval != bss_conf->beacon_int)) {
412 ath_dbg(common, CONFIG,
413 "Changing beacon interval of multiple AP interfaces !\n");
414 return false;
415 }
416
417 /*
418 * If the HW is operating in AP mode, any new station interfaces that
419 * are added cannot change the beacon parameters.
420 */
421 if (priv->num_ap_vif &&
422 (vif->type != NL80211_IFTYPE_AP)) {
423 ath_dbg(common, CONFIG,
424 "HW in AP mode, cannot set STA beacon parameters\n");
425 return false;
426 }
427
428 /*
429 * The beacon parameters are configured only for the first
430 * station interface.
431 */
432 if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
433 (priv->num_sta_vif > 1) &&
434 (vif->type == NL80211_IFTYPE_STATION)) {
435 beacon_configured = false;
436 ieee80211_iterate_active_interfaces_atomic(
437 priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
438 ath9k_htc_beacon_iter, &beacon_configured);
439
440 if (beacon_configured) {
441 ath_dbg(common, CONFIG,
442 "Beacon already configured for a station interface\n");
443 return false;
444 }
445 }
446
447 return true;
448}
449
450void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
451 struct ieee80211_vif *vif)
452{
453 struct ath_common *common = ath9k_hw_common(priv->ah);
454 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
455 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
456 struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
457
458 if (!ath9k_htc_check_beacon_config(priv, vif))
459 return;
460
461 cur_conf->beacon_interval = bss_conf->beacon_int;
462 if (cur_conf->beacon_interval == 0)
463 cur_conf->beacon_interval = 100;
464
465 cur_conf->dtim_period = bss_conf->dtim_period;
466 cur_conf->bmiss_timeout =
467 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
468
469 switch (vif->type) {
470 case NL80211_IFTYPE_STATION:
471 ath9k_htc_beacon_config_sta(priv, cur_conf);
472 avp->beacon_configured = true;
473 break;
474 case NL80211_IFTYPE_ADHOC:
475 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
476 break;
477 case NL80211_IFTYPE_MESH_POINT:
478 case NL80211_IFTYPE_AP:
479 ath9k_htc_beacon_config_ap(priv, cur_conf);
480 break;
481 default:
482 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
483 return;
484 }
485}
486
487void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
488{
489 struct ath_common *common = ath9k_hw_common(priv->ah);
490 struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
491
492 switch (priv->ah->opmode) {
493 case NL80211_IFTYPE_STATION:
494 ath9k_htc_beacon_config_sta(priv, cur_conf);
495 break;
496 case NL80211_IFTYPE_ADHOC:
497 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
498 break;
499 case NL80211_IFTYPE_MESH_POINT:
500 case NL80211_IFTYPE_AP:
501 ath9k_htc_beacon_config_ap(priv, cur_conf);
502 break;
503 default:
504 ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
505 return;
506 }
507}
508
509bool ath9k_htc_csa_is_finished(struct ath9k_htc_priv *priv)
510{
511 struct ieee80211_vif *vif;
512
513 vif = priv->csa_vif;
514 if (!vif || !vif->csa_active)
515 return false;
516
517 if (!ieee80211_beacon_cntdwn_is_complete(vif))
518 return false;
519
520 ieee80211_csa_finish(vif);
521
522 priv->csa_vif = NULL;
523 return true;
524}