htc_drv_beacon.c

  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, 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
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 (!priv->cur_beacon_conf.enable_beacon)
294		return;
295
296	if (swba->beacon_pending != 0) {
297		priv->beacon.bmisscnt++;
298		if (priv->beacon.bmisscnt > BSTUCK_THRESHOLD) {
299			ath_dbg(common, BSTUCK, "Beacon stuck, HW reset\n");
300			ieee80211_queue_work(priv->hw,
301					     &priv->fatal_work);
302		}
303		return;
304	}
305
306	if (priv->beacon.bmisscnt) {
307		ath_dbg(common, BSTUCK,
308			"Resuming beacon xmit after %u misses\n",
309			priv->beacon.bmisscnt);
310		priv->beacon.bmisscnt = 0;
311	}
312
313	slot = ath9k_htc_choose_bslot(priv, swba);
314	spin_lock_bh(&priv->beacon_lock);
315	if (priv->beacon.bslot[slot] == NULL) {
316		spin_unlock_bh(&priv->beacon_lock);
317		return;
318	}
319	spin_unlock_bh(&priv->beacon_lock);
320
321	ath9k_htc_send_buffered(priv, slot);
322	ath9k_htc_send_beacon(priv, slot);
323}
324
325void ath9k_htc_assign_bslot(struct ath9k_htc_priv *priv,
326			    struct ieee80211_vif *vif)
327{
328	struct ath_common *common = ath9k_hw_common(priv->ah);
329	struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
330	int i = 0;
331
332	spin_lock_bh(&priv->beacon_lock);
333	for (i = 0; i < ATH9K_HTC_MAX_BCN_VIF; i++) {
334		if (priv->beacon.bslot[i] == NULL) {
335			avp->bslot = i;
336			break;
337		}
338	}
339
340	priv->beacon.bslot[avp->bslot] = vif;
341	spin_unlock_bh(&priv->beacon_lock);
342
343	ath_dbg(common, CONFIG, "Added interface at beacon slot: %d\n",
344		avp->bslot);
345}
346
347void ath9k_htc_remove_bslot(struct ath9k_htc_priv *priv,
348			    struct ieee80211_vif *vif)
349{
350	struct ath_common *common = ath9k_hw_common(priv->ah);
351	struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
352
353	spin_lock_bh(&priv->beacon_lock);
354	priv->beacon.bslot[avp->bslot] = NULL;
355	spin_unlock_bh(&priv->beacon_lock);
356
357	ath_dbg(common, CONFIG, "Removed interface at beacon slot: %d\n",
358		avp->bslot);
359}
360
361/*
362 * Calculate the TSF adjustment value for all slots
363 * other than zero.
364 */
365void ath9k_htc_set_tsfadjust(struct ath9k_htc_priv *priv,
366			     struct ieee80211_vif *vif)
367{
368	struct ath_common *common = ath9k_hw_common(priv->ah);
369	struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *)vif->drv_priv;
370	struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
371	u64 tsfadjust;
372
373	if (avp->bslot == 0)
374		return;
375
376	/*
377	 * The beacon interval cannot be different for multi-AP mode,
378	 * and we reach here only for VIF slots greater than zero,
379	 * so beacon_interval is guaranteed to be set in cur_conf.
380	 */
381	tsfadjust = cur_conf->beacon_interval * avp->bslot / ATH9K_HTC_MAX_BCN_VIF;
382	avp->tsfadjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
383
384	ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n",
385		(unsigned long long)tsfadjust, avp->bslot);
386}
387
388static void ath9k_htc_beacon_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
389{
390	bool *beacon_configured = data;
391	struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
392
393	if (vif->type == NL80211_IFTYPE_STATION &&
394	    avp->beacon_configured)
395		*beacon_configured = true;
396}
397
398static bool ath9k_htc_check_beacon_config(struct ath9k_htc_priv *priv,
399					  struct ieee80211_vif *vif)
400{
401	struct ath_common *common = ath9k_hw_common(priv->ah);
402	struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
403	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
404	bool beacon_configured;
405
406	/*
407	 * Changing the beacon interval when multiple AP interfaces
408	 * are configured will affect beacon transmission of all
409	 * of them.
410	 */
411	if ((priv->ah->opmode == NL80211_IFTYPE_AP) &&
412	    (priv->num_ap_vif > 1) &&
413	    (vif->type == NL80211_IFTYPE_AP) &&
414	    (cur_conf->beacon_interval != bss_conf->beacon_int)) {
415		ath_dbg(common, CONFIG,
416			"Changing beacon interval of multiple AP interfaces !\n");
417		return false;
418	}
419
420	/*
421	 * If the HW is operating in AP mode, any new station interfaces that
422	 * are added cannot change the beacon parameters.
423	 */
424	if (priv->num_ap_vif &&
425	    (vif->type != NL80211_IFTYPE_AP)) {
426		ath_dbg(common, CONFIG,
427			"HW in AP mode, cannot set STA beacon parameters\n");
428		return false;
429	}
430
431	/*
432	 * The beacon parameters are configured only for the first
433	 * station interface.
434	 */
435	if ((priv->ah->opmode == NL80211_IFTYPE_STATION) &&
436	    (priv->num_sta_vif > 1) &&
437	    (vif->type == NL80211_IFTYPE_STATION)) {
438		beacon_configured = false;
439		ieee80211_iterate_active_interfaces_atomic(
440			priv->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
441			ath9k_htc_beacon_iter, &beacon_configured);
442
443		if (beacon_configured) {
444			ath_dbg(common, CONFIG,
445				"Beacon already configured for a station interface\n");
446			return false;
447		}
448	}
449
450	return true;
451}
452
453void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
454			     struct ieee80211_vif *vif)
455{
456	struct ath_common *common = ath9k_hw_common(priv->ah);
457	struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
458	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
459	struct ath9k_htc_vif *avp = (struct ath9k_htc_vif *) vif->drv_priv;
460
461	if (!ath9k_htc_check_beacon_config(priv, vif))
462		return;
463
464	cur_conf->beacon_interval = bss_conf->beacon_int;
465	if (cur_conf->beacon_interval == 0)
466		cur_conf->beacon_interval = 100;
467
468	cur_conf->dtim_period = bss_conf->dtim_period;
469	cur_conf->bmiss_timeout =
470		ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
471
472	switch (vif->type) {
473	case NL80211_IFTYPE_STATION:
474		ath9k_htc_beacon_config_sta(priv, cur_conf);
475		avp->beacon_configured = true;
476		break;
477	case NL80211_IFTYPE_ADHOC:
478		ath9k_htc_beacon_config_adhoc(priv, cur_conf);
479		break;
480	case NL80211_IFTYPE_MESH_POINT:
481	case NL80211_IFTYPE_AP:
482		ath9k_htc_beacon_config_ap(priv, cur_conf);
483		break;
484	default:
485		ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
486		return;
487	}
488}
489
490void ath9k_htc_beacon_reconfig(struct ath9k_htc_priv *priv)
491{
492	struct ath_common *common = ath9k_hw_common(priv->ah);
493	struct ath_beacon_config *cur_conf = &priv->cur_beacon_conf;
494
495	switch (priv->ah->opmode) {
496	case NL80211_IFTYPE_STATION:
497		ath9k_htc_beacon_config_sta(priv, cur_conf);
498		break;
499	case NL80211_IFTYPE_ADHOC:
500		ath9k_htc_beacon_config_adhoc(priv, cur_conf);
501		break;
502	case NL80211_IFTYPE_MESH_POINT:
503	case NL80211_IFTYPE_AP:
504		ath9k_htc_beacon_config_ap(priv, cur_conf);
505		break;
506	default:
507		ath_dbg(common, CONFIG, "Unsupported beaconing mode\n");
508		return;
509	}
510}
511
512bool ath9k_htc_csa_is_finished(struct ath9k_htc_priv *priv)
513{
514	struct ieee80211_vif *vif;
515
516	vif = priv->csa_vif;
517	if (!vif || !vif->bss_conf.csa_active)
518		return false;
519
520	if (!ieee80211_beacon_cntdwn_is_complete(vif, 0))
521		return false;
522
523	ieee80211_csa_finish(vif, 0);
524
525	priv->csa_vif = NULL;
526	return true;
527}