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 
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  */
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 
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 
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 
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 
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 
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 
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, 0);
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 
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 
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 
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 
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  */
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 
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 
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 
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 
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 
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->bss_conf.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