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
ath9k_htc_beaconq_config(struct ath9k_htc_priv * priv)21 void 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 */
ath9k_htc_beacon_init(struct ath9k_htc_priv * priv,struct ath_beacon_config * conf,bool reset_tsf)68 static 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
ath9k_htc_beacon_config_sta(struct ath9k_htc_priv * priv,struct ath_beacon_config * bss_conf)92 static 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
ath9k_htc_beacon_config_ap(struct ath9k_htc_priv * priv,struct ath_beacon_config * conf)111 static 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
ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv * priv,struct ath_beacon_config * conf)121 static 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
ath9k_htc_beaconep(void * drv_priv,struct sk_buff * skb,enum htc_endpoint_id ep_id,bool txok)131 void 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
ath9k_htc_send_buffered(struct ath9k_htc_priv * priv,int slot)137 static 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
ath9k_htc_send_beacon(struct ath9k_htc_priv * priv,int slot)191 static 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
ath9k_htc_choose_bslot(struct ath9k_htc_priv * priv,struct wmi_event_swba * swba)264 static 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
ath9k_htc_swba(struct ath9k_htc_priv * priv,struct wmi_event_swba * swba)287 void 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
ath9k_htc_assign_bslot(struct ath9k_htc_priv * priv,struct ieee80211_vif * vif)322 void 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
ath9k_htc_remove_bslot(struct ath9k_htc_priv * priv,struct ieee80211_vif * vif)344 void 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 */
ath9k_htc_set_tsfadjust(struct ath9k_htc_priv * priv,struct ieee80211_vif * vif)362 void 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
ath9k_htc_beacon_iter(void * data,u8 * mac,struct ieee80211_vif * vif)385 static 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
ath9k_htc_check_beacon_config(struct ath9k_htc_priv * priv,struct ieee80211_vif * vif)395 static 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
ath9k_htc_beacon_config(struct ath9k_htc_priv * priv,struct ieee80211_vif * vif)450 void 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
ath9k_htc_beacon_reconfig(struct ath9k_htc_priv * priv)487 void 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
ath9k_htc_csa_is_finished(struct ath9k_htc_priv * priv)509 bool 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 }
525
