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 /******/
20 /* TX */
21 /******/
22 
23 static const int subtype_txq_to_hwq[] = {
24 	[IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
25 	[IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
26 	[IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
27 	[IEEE80211_AC_VO] = ATH_TXQ_AC_VO,
28 };
29 
30 #define ATH9K_HTC_INIT_TXQ(subtype) do {			\
31 		qi.tqi_subtype = subtype_txq_to_hwq[subtype];	\
32 		qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;		\
33 		qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;		\
34 		qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;		\
35 		qi.tqi_physCompBuf = 0;				\
36 		qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |	\
37 			TXQ_FLAG_TXDESCINT_ENABLE;		\
38 	} while (0)
39 
40 int get_hw_qnum(u16 queue, int *hwq_map)
41 {
42 	switch (queue) {
43 	case 0:
44 		return hwq_map[IEEE80211_AC_VO];
45 	case 1:
46 		return hwq_map[IEEE80211_AC_VI];
47 	case 2:
48 		return hwq_map[IEEE80211_AC_BE];
49 	case 3:
50 		return hwq_map[IEEE80211_AC_BK];
51 	default:
52 		return hwq_map[IEEE80211_AC_BE];
53 	}
54 }
55 
56 void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
57 {
58 	spin_lock_bh(&priv->tx.tx_lock);
59 	priv->tx.queued_cnt++;
60 	if ((priv->tx.queued_cnt >= ATH9K_HTC_TX_THRESHOLD) &&
61 	    !(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
62 		priv->tx.flags |= ATH9K_HTC_OP_TX_QUEUES_STOP;
63 		ieee80211_stop_queues(priv->hw);
64 	}
65 	spin_unlock_bh(&priv->tx.tx_lock);
66 }
67 
68 void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
69 {
70 	spin_lock_bh(&priv->tx.tx_lock);
71 	if ((priv->tx.queued_cnt < ATH9K_HTC_TX_THRESHOLD) &&
72 	    (priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
73 		priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
74 		ieee80211_wake_queues(priv->hw);
75 	}
76 	spin_unlock_bh(&priv->tx.tx_lock);
77 }
78 
79 int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
80 {
81 	int slot;
82 
83 	spin_lock_bh(&priv->tx.tx_lock);
84 	slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
85 	if (slot >= MAX_TX_BUF_NUM) {
86 		spin_unlock_bh(&priv->tx.tx_lock);
87 		return -ENOBUFS;
88 	}
89 	__set_bit(slot, priv->tx.tx_slot);
90 	spin_unlock_bh(&priv->tx.tx_lock);
91 
92 	return slot;
93 }
94 
95 void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
96 {
97 	spin_lock_bh(&priv->tx.tx_lock);
98 	__clear_bit(slot, priv->tx.tx_slot);
99 	spin_unlock_bh(&priv->tx.tx_lock);
100 }
101 
102 static inline enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
103 						u16 qnum)
104 {
105 	enum htc_endpoint_id epid;
106 
107 	switch (qnum) {
108 	case 0:
109 		TX_QSTAT_INC(IEEE80211_AC_VO);
110 		epid = priv->data_vo_ep;
111 		break;
112 	case 1:
113 		TX_QSTAT_INC(IEEE80211_AC_VI);
114 		epid = priv->data_vi_ep;
115 		break;
116 	case 2:
117 		TX_QSTAT_INC(IEEE80211_AC_BE);
118 		epid = priv->data_be_ep;
119 		break;
120 	case 3:
121 	default:
122 		TX_QSTAT_INC(IEEE80211_AC_BK);
123 		epid = priv->data_bk_ep;
124 		break;
125 	}
126 
127 	return epid;
128 }
129 
130 static inline struct sk_buff_head*
131 get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
132 {
133 	struct ath_common *common = ath9k_hw_common(priv->ah);
134 	struct sk_buff_head *epid_queue = NULL;
135 
136 	if (epid == priv->mgmt_ep)
137 		epid_queue = &priv->tx.mgmt_ep_queue;
138 	else if (epid == priv->cab_ep)
139 		epid_queue = &priv->tx.cab_ep_queue;
140 	else if (epid == priv->data_be_ep)
141 		epid_queue = &priv->tx.data_be_queue;
142 	else if (epid == priv->data_bk_ep)
143 		epid_queue = &priv->tx.data_bk_queue;
144 	else if (epid == priv->data_vi_ep)
145 		epid_queue = &priv->tx.data_vi_queue;
146 	else if (epid == priv->data_vo_ep)
147 		epid_queue = &priv->tx.data_vo_queue;
148 	else
149 		ath_err(common, "Invalid EPID: %d\n", epid);
150 
151 	return epid_queue;
152 }
153 
154 /*
155  * Removes the driver header and returns the TX slot number
156  */
157 static inline int strip_drv_header(struct ath9k_htc_priv *priv,
158 				   struct sk_buff *skb)
159 {
160 	struct ath_common *common = ath9k_hw_common(priv->ah);
161 	struct ath9k_htc_tx_ctl *tx_ctl;
162 	int slot;
163 
164 	tx_ctl = HTC_SKB_CB(skb);
165 
166 	if (tx_ctl->epid == priv->mgmt_ep) {
167 		struct tx_mgmt_hdr *tx_mhdr =
168 			(struct tx_mgmt_hdr *)skb->data;
169 		slot = tx_mhdr->cookie;
170 		skb_pull(skb, sizeof(struct tx_mgmt_hdr));
171 	} else if ((tx_ctl->epid == priv->data_bk_ep) ||
172 		   (tx_ctl->epid == priv->data_be_ep) ||
173 		   (tx_ctl->epid == priv->data_vi_ep) ||
174 		   (tx_ctl->epid == priv->data_vo_ep) ||
175 		   (tx_ctl->epid == priv->cab_ep)) {
176 		struct tx_frame_hdr *tx_fhdr =
177 			(struct tx_frame_hdr *)skb->data;
178 		slot = tx_fhdr->cookie;
179 		skb_pull(skb, sizeof(struct tx_frame_hdr));
180 	} else {
181 		ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
182 		slot = -EINVAL;
183 	}
184 
185 	return slot;
186 }
187 
188 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
189 		       struct ath9k_tx_queue_info *qinfo)
190 {
191 	struct ath_hw *ah = priv->ah;
192 	int error = 0;
193 	struct ath9k_tx_queue_info qi;
194 
195 	ath9k_hw_get_txq_props(ah, qnum, &qi);
196 
197 	qi.tqi_aifs = qinfo->tqi_aifs;
198 	qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
199 	qi.tqi_cwmax = qinfo->tqi_cwmax;
200 	qi.tqi_burstTime = qinfo->tqi_burstTime;
201 	qi.tqi_readyTime = qinfo->tqi_readyTime;
202 
203 	if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
204 		ath_err(ath9k_hw_common(ah),
205 			"Unable to update hardware queue %u!\n", qnum);
206 		error = -EIO;
207 	} else {
208 		ath9k_hw_resettxqueue(ah, qnum);
209 	}
210 
211 	return error;
212 }
213 
214 static void ath9k_htc_tx_mgmt(struct ath9k_htc_priv *priv,
215 			      struct ath9k_htc_vif *avp,
216 			      struct sk_buff *skb,
217 			      u8 sta_idx, u8 vif_idx, u8 slot)
218 {
219 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
220 	struct ieee80211_mgmt *mgmt;
221 	struct ieee80211_hdr *hdr;
222 	struct tx_mgmt_hdr mgmt_hdr;
223 	struct ath9k_htc_tx_ctl *tx_ctl;
224 	u8 *tx_fhdr;
225 
226 	tx_ctl = HTC_SKB_CB(skb);
227 	hdr = (struct ieee80211_hdr *) skb->data;
228 
229 	memset(tx_ctl, 0, sizeof(*tx_ctl));
230 	memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
231 
232 	/*
233 	 * Set the TSF adjust value for probe response
234 	 * frame also.
235 	 */
236 	if (avp && unlikely(ieee80211_is_probe_resp(hdr->frame_control))) {
237 		mgmt = (struct ieee80211_mgmt *)skb->data;
238 		mgmt->u.probe_resp.timestamp = avp->tsfadjust;
239 	}
240 
241 	tx_ctl->type = ATH9K_HTC_MGMT;
242 
243 	mgmt_hdr.node_idx = sta_idx;
244 	mgmt_hdr.vif_idx = vif_idx;
245 	mgmt_hdr.tidno = 0;
246 	mgmt_hdr.flags = 0;
247 	mgmt_hdr.cookie = slot;
248 
249 	mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
250 	if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
251 		mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
252 	else
253 		mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
254 
255 	tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
256 	memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
257 	tx_ctl->epid = priv->mgmt_ep;
258 }
259 
260 static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
261 			      struct ieee80211_vif *vif,
262 			      struct sk_buff *skb,
263 			      u8 sta_idx, u8 vif_idx, u8 slot,
264 			      bool is_cab)
265 {
266 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
267 	struct ieee80211_hdr *hdr;
268 	struct ath9k_htc_tx_ctl *tx_ctl;
269 	struct tx_frame_hdr tx_hdr;
270 	u32 flags = 0;
271 	u8 *qc, *tx_fhdr;
272 	u16 qnum;
273 
274 	tx_ctl = HTC_SKB_CB(skb);
275 	hdr = (struct ieee80211_hdr *) skb->data;
276 
277 	memset(tx_ctl, 0, sizeof(*tx_ctl));
278 	memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
279 
280 	tx_hdr.node_idx = sta_idx;
281 	tx_hdr.vif_idx = vif_idx;
282 	tx_hdr.cookie = slot;
283 
284 	/*
285 	 * This is a bit redundant but it helps to get
286 	 * the per-packet index quickly when draining the
287 	 * TX queue in the HIF layer. Otherwise we would
288 	 * have to parse the packet contents ...
289 	 */
290 	tx_ctl->sta_idx = sta_idx;
291 
292 	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
293 		tx_ctl->type = ATH9K_HTC_AMPDU;
294 		tx_hdr.data_type = ATH9K_HTC_AMPDU;
295 	} else {
296 		tx_ctl->type = ATH9K_HTC_NORMAL;
297 		tx_hdr.data_type = ATH9K_HTC_NORMAL;
298 	}
299 
300 	if (ieee80211_is_data_qos(hdr->frame_control)) {
301 		qc = ieee80211_get_qos_ctl(hdr);
302 		tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
303 	}
304 
305 	/* Check for RTS protection */
306 	if (priv->hw->wiphy->rts_threshold != (u32) -1)
307 		if (skb->len > priv->hw->wiphy->rts_threshold)
308 			flags |= ATH9K_HTC_TX_RTSCTS;
309 
310 	/* CTS-to-self */
311 	if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
312 	    (vif && vif->bss_conf.use_cts_prot))
313 		flags |= ATH9K_HTC_TX_CTSONLY;
314 
315 	tx_hdr.flags = cpu_to_be32(flags);
316 	tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
317 	if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
318 		tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
319 	else
320 		tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
321 
322 	tx_fhdr = skb_push(skb, sizeof(tx_hdr));
323 	memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
324 
325 	if (is_cab) {
326 		CAB_STAT_INC;
327 		tx_ctl->epid = priv->cab_ep;
328 		return;
329 	}
330 
331 	qnum = skb_get_queue_mapping(skb);
332 	tx_ctl->epid = get_htc_epid(priv, qnum);
333 }
334 
335 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
336 		       struct ieee80211_sta *sta,
337 		       struct sk_buff *skb,
338 		       u8 slot, bool is_cab)
339 {
340 	struct ieee80211_hdr *hdr;
341 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
342 	struct ieee80211_vif *vif = tx_info->control.vif;
343 	struct ath9k_htc_sta *ista;
344 	struct ath9k_htc_vif *avp = NULL;
345 	u8 sta_idx, vif_idx;
346 
347 	hdr = (struct ieee80211_hdr *) skb->data;
348 
349 	/*
350 	 * Find out on which interface this packet has to be
351 	 * sent out.
352 	 */
353 	if (vif) {
354 		avp = (struct ath9k_htc_vif *) vif->drv_priv;
355 		vif_idx = avp->index;
356 	} else {
357 		if (!priv->ah->is_monitoring) {
358 			ath_dbg(ath9k_hw_common(priv->ah), XMIT,
359 				"VIF is null, but no monitor interface !\n");
360 			return -EINVAL;
361 		}
362 
363 		vif_idx = priv->mon_vif_idx;
364 	}
365 
366 	/*
367 	 * Find out which station this packet is destined for.
368 	 */
369 	if (sta) {
370 		ista = (struct ath9k_htc_sta *) sta->drv_priv;
371 		sta_idx = ista->index;
372 	} else {
373 		sta_idx = priv->vif_sta_pos[vif_idx];
374 	}
375 
376 	if (ieee80211_is_data(hdr->frame_control))
377 		ath9k_htc_tx_data(priv, vif, skb,
378 				  sta_idx, vif_idx, slot, is_cab);
379 	else
380 		ath9k_htc_tx_mgmt(priv, avp, skb,
381 				  sta_idx, vif_idx, slot);
382 
383 
384 	return htc_send(priv->htc, skb);
385 }
386 
387 static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
388 					     struct ath9k_htc_sta *ista, u8 tid)
389 {
390 	bool ret = false;
391 
392 	spin_lock_bh(&priv->tx.tx_lock);
393 	if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
394 		ret = true;
395 	spin_unlock_bh(&priv->tx.tx_lock);
396 
397 	return ret;
398 }
399 
400 static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
401 				    struct ieee80211_vif *vif,
402 				    struct sk_buff *skb)
403 {
404 	struct ieee80211_sta *sta;
405 	struct ieee80211_hdr *hdr;
406 	__le16 fc;
407 
408 	hdr = (struct ieee80211_hdr *) skb->data;
409 	fc = hdr->frame_control;
410 
411 	rcu_read_lock();
412 
413 	sta = ieee80211_find_sta(vif, hdr->addr1);
414 	if (!sta) {
415 		rcu_read_unlock();
416 		return;
417 	}
418 
419 	if (sta && conf_is_ht(&priv->hw->conf) &&
420 	    !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
421 		if (ieee80211_is_data_qos(fc)) {
422 			u8 *qc, tid;
423 			struct ath9k_htc_sta *ista;
424 
425 			qc = ieee80211_get_qos_ctl(hdr);
426 			tid = qc[0] & 0xf;
427 			ista = (struct ath9k_htc_sta *)sta->drv_priv;
428 			if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
429 				ieee80211_start_tx_ba_session(sta, tid, 0);
430 				spin_lock_bh(&priv->tx.tx_lock);
431 				ista->tid_state[tid] = AGGR_PROGRESS;
432 				spin_unlock_bh(&priv->tx.tx_lock);
433 			}
434 		}
435 	}
436 
437 	rcu_read_unlock();
438 }
439 
440 static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
441 				 struct sk_buff *skb,
442 				 struct __wmi_event_txstatus *txs)
443 {
444 	struct ieee80211_vif *vif;
445 	struct ath9k_htc_tx_ctl *tx_ctl;
446 	struct ieee80211_tx_info *tx_info;
447 	struct ieee80211_tx_rate *rate;
448 	struct ieee80211_conf *cur_conf = &priv->hw->conf;
449 	bool txok;
450 	int slot;
451 	int hdrlen, padsize;
452 
453 	slot = strip_drv_header(priv, skb);
454 	if (slot < 0) {
455 		dev_kfree_skb_any(skb);
456 		return;
457 	}
458 
459 	tx_ctl = HTC_SKB_CB(skb);
460 	txok = tx_ctl->txok;
461 	tx_info = IEEE80211_SKB_CB(skb);
462 	vif = tx_info->control.vif;
463 	rate = &tx_info->status.rates[0];
464 
465 	memset(&tx_info->status, 0, sizeof(tx_info->status));
466 
467 	/*
468 	 * URB submission failed for this frame, it never reached
469 	 * the target.
470 	 */
471 	if (!txok || !vif || !txs)
472 		goto send_mac80211;
473 
474 	if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
475 		tx_info->flags |= IEEE80211_TX_STAT_ACK;
476 		if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
477 			tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
478 	}
479 
480 	if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
481 		tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
482 
483 	if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
484 		rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
485 
486 	rate->count = 1;
487 	rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
488 
489 	if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
490 		rate->flags |= IEEE80211_TX_RC_MCS;
491 
492 		if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
493 			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
494 		if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
495 			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
496 	} else {
497 		if (cur_conf->chandef.chan->band == IEEE80211_BAND_5GHZ)
498 			rate->idx += 4; /* No CCK rates */
499 	}
500 
501 	ath9k_htc_check_tx_aggr(priv, vif, skb);
502 
503 send_mac80211:
504 	spin_lock_bh(&priv->tx.tx_lock);
505 	if (WARN_ON(--priv->tx.queued_cnt < 0))
506 		priv->tx.queued_cnt = 0;
507 	spin_unlock_bh(&priv->tx.tx_lock);
508 
509 	ath9k_htc_tx_clear_slot(priv, slot);
510 
511 	/* Remove padding before handing frame back to mac80211 */
512 	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
513 
514 	padsize = hdrlen & 3;
515 	if (padsize && skb->len > hdrlen + padsize) {
516 		memmove(skb->data + padsize, skb->data, hdrlen);
517 		skb_pull(skb, padsize);
518 	}
519 
520 	/* Send status to mac80211 */
521 	ieee80211_tx_status(priv->hw, skb);
522 }
523 
524 static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
525 				       struct sk_buff_head *queue)
526 {
527 	struct sk_buff *skb;
528 
529 	while ((skb = skb_dequeue(queue)) != NULL) {
530 		ath9k_htc_tx_process(priv, skb, NULL);
531 	}
532 }
533 
534 void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
535 {
536 	struct ath9k_htc_tx_event *event, *tmp;
537 
538 	spin_lock_bh(&priv->tx.tx_lock);
539 	priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
540 	spin_unlock_bh(&priv->tx.tx_lock);
541 
542 	/*
543 	 * Ensure that all pending TX frames are flushed,
544 	 * and that the TX completion/failed tasklets is killed.
545 	 */
546 	htc_stop(priv->htc);
547 	tasklet_kill(&priv->wmi->wmi_event_tasklet);
548 	tasklet_kill(&priv->tx_failed_tasklet);
549 
550 	ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
551 	ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
552 	ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
553 	ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
554 	ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
555 	ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
556 	ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
557 
558 	/*
559 	 * The TX cleanup timer has already been killed.
560 	 */
561 	spin_lock_bh(&priv->wmi->event_lock);
562 	list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
563 		list_del(&event->list);
564 		kfree(event);
565 	}
566 	spin_unlock_bh(&priv->wmi->event_lock);
567 
568 	spin_lock_bh(&priv->tx.tx_lock);
569 	priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
570 	spin_unlock_bh(&priv->tx.tx_lock);
571 }
572 
573 void ath9k_tx_failed_tasklet(unsigned long data)
574 {
575 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
576 
577 	spin_lock_bh(&priv->tx.tx_lock);
578 	if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
579 		spin_unlock_bh(&priv->tx.tx_lock);
580 		return;
581 	}
582 	spin_unlock_bh(&priv->tx.tx_lock);
583 
584 	ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
585 }
586 
587 static inline bool check_cookie(struct ath9k_htc_priv *priv,
588 				struct sk_buff *skb,
589 				u8 cookie, u8 epid)
590 {
591 	u8 fcookie = 0;
592 
593 	if (epid == priv->mgmt_ep) {
594 		struct tx_mgmt_hdr *hdr;
595 		hdr = (struct tx_mgmt_hdr *) skb->data;
596 		fcookie = hdr->cookie;
597 	} else if ((epid == priv->data_bk_ep) ||
598 		   (epid == priv->data_be_ep) ||
599 		   (epid == priv->data_vi_ep) ||
600 		   (epid == priv->data_vo_ep) ||
601 		   (epid == priv->cab_ep)) {
602 		struct tx_frame_hdr *hdr;
603 		hdr = (struct tx_frame_hdr *) skb->data;
604 		fcookie = hdr->cookie;
605 	}
606 
607 	if (fcookie == cookie)
608 		return true;
609 
610 	return false;
611 }
612 
613 static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
614 					       struct __wmi_event_txstatus *txs)
615 {
616 	struct ath_common *common = ath9k_hw_common(priv->ah);
617 	struct sk_buff_head *epid_queue;
618 	struct sk_buff *skb, *tmp;
619 	unsigned long flags;
620 	u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
621 
622 	epid_queue = get_htc_epid_queue(priv, epid);
623 	if (!epid_queue)
624 		return NULL;
625 
626 	spin_lock_irqsave(&epid_queue->lock, flags);
627 	skb_queue_walk_safe(epid_queue, skb, tmp) {
628 		if (check_cookie(priv, skb, txs->cookie, epid)) {
629 			__skb_unlink(skb, epid_queue);
630 			spin_unlock_irqrestore(&epid_queue->lock, flags);
631 			return skb;
632 		}
633 	}
634 	spin_unlock_irqrestore(&epid_queue->lock, flags);
635 
636 	ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
637 		txs->cookie, epid);
638 
639 	return NULL;
640 }
641 
642 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
643 {
644 	struct wmi_event_txstatus *txs = (struct wmi_event_txstatus *)wmi_event;
645 	struct __wmi_event_txstatus *__txs;
646 	struct sk_buff *skb;
647 	struct ath9k_htc_tx_event *tx_pend;
648 	int i;
649 
650 	for (i = 0; i < txs->cnt; i++) {
651 		WARN_ON(txs->cnt > HTC_MAX_TX_STATUS);
652 
653 		__txs = &txs->txstatus[i];
654 
655 		skb = ath9k_htc_tx_get_packet(priv, __txs);
656 		if (!skb) {
657 			/*
658 			 * Store this event, so that the TX cleanup
659 			 * routine can check later for the needed packet.
660 			 */
661 			tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
662 					  GFP_ATOMIC);
663 			if (!tx_pend)
664 				continue;
665 
666 			memcpy(&tx_pend->txs, __txs,
667 			       sizeof(struct __wmi_event_txstatus));
668 
669 			spin_lock(&priv->wmi->event_lock);
670 			list_add_tail(&tx_pend->list,
671 				      &priv->wmi->pending_tx_events);
672 			spin_unlock(&priv->wmi->event_lock);
673 
674 			continue;
675 		}
676 
677 		ath9k_htc_tx_process(priv, skb, __txs);
678 	}
679 
680 	/* Wake TX queues if needed */
681 	ath9k_htc_check_wake_queues(priv);
682 }
683 
684 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
685 		    enum htc_endpoint_id ep_id, bool txok)
686 {
687 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
688 	struct ath9k_htc_tx_ctl *tx_ctl;
689 	struct sk_buff_head *epid_queue;
690 
691 	tx_ctl = HTC_SKB_CB(skb);
692 	tx_ctl->txok = txok;
693 	tx_ctl->timestamp = jiffies;
694 
695 	if (!txok) {
696 		skb_queue_tail(&priv->tx.tx_failed, skb);
697 		tasklet_schedule(&priv->tx_failed_tasklet);
698 		return;
699 	}
700 
701 	epid_queue = get_htc_epid_queue(priv, ep_id);
702 	if (!epid_queue) {
703 		dev_kfree_skb_any(skb);
704 		return;
705 	}
706 
707 	skb_queue_tail(epid_queue, skb);
708 }
709 
710 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
711 {
712 	struct ath_common *common = ath9k_hw_common(priv->ah);
713 	struct ath9k_htc_tx_ctl *tx_ctl;
714 
715 	tx_ctl = HTC_SKB_CB(skb);
716 
717 	if (time_after(jiffies,
718 		       tx_ctl->timestamp +
719 		       msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
720 		ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
721 		return true;
722 	}
723 
724 	return false;
725 }
726 
727 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
728 				       struct sk_buff_head *epid_queue)
729 {
730 	bool process = false;
731 	unsigned long flags;
732 	struct sk_buff *skb, *tmp;
733 	struct sk_buff_head queue;
734 
735 	skb_queue_head_init(&queue);
736 
737 	spin_lock_irqsave(&epid_queue->lock, flags);
738 	skb_queue_walk_safe(epid_queue, skb, tmp) {
739 		if (check_packet(priv, skb)) {
740 			__skb_unlink(skb, epid_queue);
741 			__skb_queue_tail(&queue, skb);
742 			process = true;
743 		}
744 	}
745 	spin_unlock_irqrestore(&epid_queue->lock, flags);
746 
747 	if (process) {
748 		skb_queue_walk_safe(&queue, skb, tmp) {
749 			__skb_unlink(skb, &queue);
750 			ath9k_htc_tx_process(priv, skb, NULL);
751 		}
752 	}
753 }
754 
755 void ath9k_htc_tx_cleanup_timer(unsigned long data)
756 {
757 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) data;
758 	struct ath_common *common = ath9k_hw_common(priv->ah);
759 	struct ath9k_htc_tx_event *event, *tmp;
760 	struct sk_buff *skb;
761 
762 	spin_lock(&priv->wmi->event_lock);
763 	list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
764 
765 		skb = ath9k_htc_tx_get_packet(priv, &event->txs);
766 		if (skb) {
767 			ath_dbg(common, XMIT,
768 				"Found packet for cookie: %d, epid: %d\n",
769 				event->txs.cookie,
770 				MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
771 
772 			ath9k_htc_tx_process(priv, skb, &event->txs);
773 			list_del(&event->list);
774 			kfree(event);
775 			continue;
776 		}
777 
778 		if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
779 			list_del(&event->list);
780 			kfree(event);
781 		}
782 	}
783 	spin_unlock(&priv->wmi->event_lock);
784 
785 	/*
786 	 * Check if status-pending packets have to be cleaned up.
787 	 */
788 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
789 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
790 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
791 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
792 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
793 	ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
794 
795 	/* Wake TX queues if needed */
796 	ath9k_htc_check_wake_queues(priv);
797 
798 	mod_timer(&priv->tx.cleanup_timer,
799 		  jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
800 }
801 
802 int ath9k_tx_init(struct ath9k_htc_priv *priv)
803 {
804 	skb_queue_head_init(&priv->tx.mgmt_ep_queue);
805 	skb_queue_head_init(&priv->tx.cab_ep_queue);
806 	skb_queue_head_init(&priv->tx.data_be_queue);
807 	skb_queue_head_init(&priv->tx.data_bk_queue);
808 	skb_queue_head_init(&priv->tx.data_vi_queue);
809 	skb_queue_head_init(&priv->tx.data_vo_queue);
810 	skb_queue_head_init(&priv->tx.tx_failed);
811 	return 0;
812 }
813 
814 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
815 {
816 
817 }
818 
819 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
820 {
821 	struct ath_hw *ah = priv->ah;
822 	struct ath_common *common = ath9k_hw_common(ah);
823 	struct ath9k_tx_queue_info qi;
824 	int qnum;
825 
826 	memset(&qi, 0, sizeof(qi));
827 	ATH9K_HTC_INIT_TXQ(subtype);
828 
829 	qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
830 	if (qnum == -1)
831 		return false;
832 
833 	if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
834 		ath_err(common, "qnum %u out of range, max %zu!\n",
835 			qnum, ARRAY_SIZE(priv->hwq_map));
836 		ath9k_hw_releasetxqueue(ah, qnum);
837 		return false;
838 	}
839 
840 	priv->hwq_map[subtype] = qnum;
841 	return true;
842 }
843 
844 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
845 {
846 	struct ath9k_tx_queue_info qi;
847 
848 	memset(&qi, 0, sizeof(qi));
849 	ATH9K_HTC_INIT_TXQ(0);
850 
851 	return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
852 }
853 
854 /******/
855 /* RX */
856 /******/
857 
858 /*
859  * Calculate the RX filter to be set in the HW.
860  */
861 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
862 {
863 #define	RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
864 
865 	struct ath_hw *ah = priv->ah;
866 	u32 rfilt;
867 
868 	rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
869 		| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
870 		| ATH9K_RX_FILTER_MCAST;
871 
872 	if (priv->rxfilter & FIF_PROBE_REQ)
873 		rfilt |= ATH9K_RX_FILTER_PROBEREQ;
874 
875 	/*
876 	 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
877 	 * mode interface or when in monitor mode. AP mode does not need this
878 	 * since it receives all in-BSS frames anyway.
879 	 */
880 	if (((ah->opmode != NL80211_IFTYPE_AP) &&
881 	     (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
882 	    ah->is_monitoring)
883 		rfilt |= ATH9K_RX_FILTER_PROM;
884 
885 	if (priv->rxfilter & FIF_CONTROL)
886 		rfilt |= ATH9K_RX_FILTER_CONTROL;
887 
888 	if ((ah->opmode == NL80211_IFTYPE_STATION) &&
889 	    (priv->nvifs <= 1) &&
890 	    !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
891 		rfilt |= ATH9K_RX_FILTER_MYBEACON;
892 	else
893 		rfilt |= ATH9K_RX_FILTER_BEACON;
894 
895 	if (conf_is_ht(&priv->hw->conf)) {
896 		rfilt |= ATH9K_RX_FILTER_COMP_BAR;
897 		rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
898 	}
899 
900 	if (priv->rxfilter & FIF_PSPOLL)
901 		rfilt |= ATH9K_RX_FILTER_PSPOLL;
902 
903 	if (priv->nvifs > 1 || priv->rxfilter & FIF_OTHER_BSS)
904 		rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
905 
906 	return rfilt;
907 
908 #undef RX_FILTER_PRESERVE
909 }
910 
911 /*
912  * Recv initialization for opmode change.
913  */
914 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
915 {
916 	struct ath_hw *ah = priv->ah;
917 	u32 rfilt, mfilt[2];
918 
919 	/* configure rx filter */
920 	rfilt = ath9k_htc_calcrxfilter(priv);
921 	ath9k_hw_setrxfilter(ah, rfilt);
922 
923 	/* calculate and install multicast filter */
924 	mfilt[0] = mfilt[1] = ~0;
925 	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
926 }
927 
928 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
929 {
930 	struct ath_common *common = ath9k_hw_common(priv->ah);
931 	ath9k_hw_rxena(priv->ah);
932 	ath9k_htc_opmode_init(priv);
933 	ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
934 }
935 
936 static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
937 				   struct ath_htc_rx_status *rxstatus)
938 {
939 	rx_stats->flag = 0;
940 	if (rxstatus->rs_flags & ATH9K_RX_2040)
941 		rx_stats->flag |= RX_FLAG_40MHZ;
942 	if (rxstatus->rs_flags & ATH9K_RX_GI)
943 		rx_stats->flag |= RX_FLAG_SHORT_GI;
944 }
945 
946 static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
947 				 struct ath_htc_rx_status *rxstatus)
948 {
949 	rx_stats->rs_datalen	= be16_to_cpu(rxstatus->rs_datalen);
950 	rx_stats->rs_status	= rxstatus->rs_status;
951 	rx_stats->rs_phyerr	= rxstatus->rs_phyerr;
952 	rx_stats->rs_rssi	= rxstatus->rs_rssi;
953 	rx_stats->rs_keyix	= rxstatus->rs_keyix;
954 	rx_stats->rs_rate	= rxstatus->rs_rate;
955 	rx_stats->rs_antenna	= rxstatus->rs_antenna;
956 	rx_stats->rs_more	= rxstatus->rs_more;
957 
958 	memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
959 		sizeof(rx_stats->rs_rssi_ctl));
960 	memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
961 		sizeof(rx_stats->rs_rssi_ext));
962 
963 	rx_stats->rs_isaggr	= rxstatus->rs_isaggr;
964 	rx_stats->rs_moreaggr	= rxstatus->rs_moreaggr;
965 	rx_stats->rs_num_delims	= rxstatus->rs_num_delims;
966 	convert_htc_flag(rx_stats, rxstatus);
967 }
968 
969 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
970 			     struct ath9k_htc_rxbuf *rxbuf,
971 			     struct ieee80211_rx_status *rx_status)
972 
973 {
974 	struct ieee80211_hdr *hdr;
975 	struct ieee80211_hw *hw = priv->hw;
976 	struct sk_buff *skb = rxbuf->skb;
977 	struct ath_common *common = ath9k_hw_common(priv->ah);
978 	struct ath_hw *ah = common->ah;
979 	struct ath_htc_rx_status *rxstatus;
980 	struct ath_rx_status rx_stats;
981 	bool decrypt_error = false;
982 
983 	if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
984 		ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
985 			skb->len);
986 		goto rx_next;
987 	}
988 
989 	rxstatus = (struct ath_htc_rx_status *)skb->data;
990 
991 	if (be16_to_cpu(rxstatus->rs_datalen) -
992 	    (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
993 		ath_err(common,
994 			"Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
995 			rxstatus->rs_datalen, skb->len);
996 		goto rx_next;
997 	}
998 
999 	/* Get the RX status information */
1000 
1001 	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1002 
1003 	/* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1004 	 * After this, we can drop this part of skb. */
1005 	rx_status_htc_to_ath(&rx_stats, rxstatus);
1006 	ath9k_htc_err_stat_rx(priv, &rx_stats);
1007 	rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1008 	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1009 
1010 	/*
1011 	 * everything but the rate is checked here, the rate check is done
1012 	 * separately to avoid doing two lookups for a rate for each frame.
1013 	 */
1014 	hdr = (struct ieee80211_hdr *)skb->data;
1015 
1016 	/*
1017 	 * Process PHY errors and return so that the packet
1018 	 * can be dropped.
1019 	 */
1020 	if (rx_stats.rs_status & ATH9K_RXERR_PHY) {
1021 		/* TODO: Not using DFS processing now. */
1022 		if (ath_cmn_process_fft(&priv->spec_priv, hdr,
1023 				    &rx_stats, rx_status->mactime)) {
1024 			/* TODO: Code to collect spectral scan statistics */
1025 		}
1026 		goto rx_next;
1027 	}
1028 
1029 	if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
1030 			&decrypt_error, priv->rxfilter))
1031 		goto rx_next;
1032 
1033 	ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
1034 				     rx_status, decrypt_error);
1035 
1036 	if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
1037 		goto rx_next;
1038 
1039 	rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1040 	ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
1041 
1042 	rx_status->band = ah->curchan->chan->band;
1043 	rx_status->freq = ah->curchan->chan->center_freq;
1044 	rx_status->antenna = rx_stats.rs_antenna;
1045 	rx_status->flag |= RX_FLAG_MACTIME_END;
1046 
1047 	return true;
1048 rx_next:
1049 	return false;
1050 }
1051 
1052 /*
1053  * FIXME: Handle FLUSH later on.
1054  */
1055 void ath9k_rx_tasklet(unsigned long data)
1056 {
1057 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
1058 	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1059 	struct ieee80211_rx_status rx_status;
1060 	struct sk_buff *skb;
1061 	unsigned long flags;
1062 	struct ieee80211_hdr *hdr;
1063 
1064 	do {
1065 		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1066 		list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1067 			if (tmp_buf->in_process) {
1068 				rxbuf = tmp_buf;
1069 				break;
1070 			}
1071 		}
1072 
1073 		if (rxbuf == NULL) {
1074 			spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1075 			break;
1076 		}
1077 
1078 		if (!rxbuf->skb)
1079 			goto requeue;
1080 
1081 		if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1082 			dev_kfree_skb_any(rxbuf->skb);
1083 			goto requeue;
1084 		}
1085 
1086 		memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1087 		       sizeof(struct ieee80211_rx_status));
1088 		skb = rxbuf->skb;
1089 		hdr = (struct ieee80211_hdr *) skb->data;
1090 
1091 		if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1092 				ieee80211_queue_work(priv->hw, &priv->ps_work);
1093 
1094 		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1095 
1096 		ieee80211_rx(priv->hw, skb);
1097 
1098 		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1099 requeue:
1100 		rxbuf->in_process = false;
1101 		rxbuf->skb = NULL;
1102 		list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1103 		rxbuf = NULL;
1104 		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1105 	} while (1);
1106 
1107 }
1108 
1109 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1110 		    enum htc_endpoint_id ep_id)
1111 {
1112 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
1113 	struct ath_hw *ah = priv->ah;
1114 	struct ath_common *common = ath9k_hw_common(ah);
1115 	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1116 
1117 	spin_lock(&priv->rx.rxbuflock);
1118 	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1119 		if (!tmp_buf->in_process) {
1120 			rxbuf = tmp_buf;
1121 			break;
1122 		}
1123 	}
1124 	spin_unlock(&priv->rx.rxbuflock);
1125 
1126 	if (rxbuf == NULL) {
1127 		ath_dbg(common, ANY, "No free RX buffer\n");
1128 		goto err;
1129 	}
1130 
1131 	spin_lock(&priv->rx.rxbuflock);
1132 	rxbuf->skb = skb;
1133 	rxbuf->in_process = true;
1134 	spin_unlock(&priv->rx.rxbuflock);
1135 
1136 	tasklet_schedule(&priv->rx_tasklet);
1137 	return;
1138 err:
1139 	dev_kfree_skb_any(skb);
1140 }
1141 
1142 /* FIXME: Locking for cleanup/init */
1143 
1144 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1145 {
1146 	struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1147 
1148 	list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1149 		list_del(&rxbuf->list);
1150 		if (rxbuf->skb)
1151 			dev_kfree_skb_any(rxbuf->skb);
1152 		kfree(rxbuf);
1153 	}
1154 }
1155 
1156 int ath9k_rx_init(struct ath9k_htc_priv *priv)
1157 {
1158 	int i = 0;
1159 
1160 	INIT_LIST_HEAD(&priv->rx.rxbuf);
1161 	spin_lock_init(&priv->rx.rxbuflock);
1162 
1163 	for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1164 		struct ath9k_htc_rxbuf *rxbuf =
1165 			kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1166 		if (rxbuf == NULL)
1167 			goto err;
1168 
1169 		list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1170 	}
1171 
1172 	return 0;
1173 
1174 err:
1175 	ath9k_rx_cleanup(priv);
1176 	return -ENOMEM;
1177 }
1178