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
23static 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
40int 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
56void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
57{
58 spin_lock_bh(lock: &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(hw: priv->hw);
64 }
65 spin_unlock_bh(lock: &priv->tx.tx_lock);
66}
67
68void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
69{
70 spin_lock_bh(lock: &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(hw: priv->hw);
75 }
76 spin_unlock_bh(lock: &priv->tx.tx_lock);
77}
78
79int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
80{
81 int slot;
82
83 spin_lock_bh(lock: &priv->tx.tx_lock);
84 slot = find_first_zero_bit(addr: priv->tx.tx_slot, MAX_TX_BUF_NUM);
85 if (slot >= MAX_TX_BUF_NUM) {
86 spin_unlock_bh(lock: &priv->tx.tx_lock);
87 return -ENOBUFS;
88 }
89 __set_bit(slot, priv->tx.tx_slot);
90 spin_unlock_bh(lock: &priv->tx.tx_lock);
91
92 return slot;
93}
94
95void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
96{
97 spin_lock_bh(lock: &priv->tx.tx_lock);
98 __clear_bit(slot, priv->tx.tx_slot);
99 spin_unlock_bh(lock: &priv->tx.tx_lock);
100}
101
102static 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(priv, IEEE80211_AC_VO);
110 epid = priv->data_vo_ep;
111 break;
112 case 1:
113 TX_QSTAT_INC(priv, IEEE80211_AC_VI);
114 epid = priv->data_vi_ep;
115 break;
116 case 2:
117 TX_QSTAT_INC(priv, IEEE80211_AC_BE);
118 epid = priv->data_be_ep;
119 break;
120 case 3:
121 default:
122 TX_QSTAT_INC(priv, IEEE80211_AC_BK);
123 epid = priv->data_bk_ep;
124 break;
125 }
126
127 return epid;
128}
129
130static inline struct sk_buff_head*
131get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
132{
133 struct ath_common *common = ath9k_hw_common(ah: 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 */
157static inline int strip_drv_header(struct ath9k_htc_priv *priv,
158 struct sk_buff *skb)
159{
160 struct ath_common *common = ath9k_hw_common(ah: 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, len: 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, len: 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
188int 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, q: qnum, qinfo: &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, q: qnum, qinfo: &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, q: qnum);
209 }
210
211 return error;
212}
213
214static 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, len: sizeof(mgmt_hdr));
256 memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
257 tx_ctl->epid = priv->mgmt_ep;
258}
259
260static 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 /* Transmit all frames that should not be reordered relative
301 * to each other using the same priority. For other QoS data
302 * frames extract the priority from the header.
303 */
304 if (!(tx_info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) &&
305 ieee80211_is_data_qos(fc: hdr->frame_control)) {
306 qc = ieee80211_get_qos_ctl(hdr);
307 tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
308 }
309
310 /* Check for RTS protection */
311 if (priv->hw->wiphy->rts_threshold != (u32) -1)
312 if (skb->len > priv->hw->wiphy->rts_threshold)
313 flags |= ATH9K_HTC_TX_RTSCTS;
314
315 /* CTS-to-self */
316 if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
317 (vif && vif->bss_conf.use_cts_prot))
318 flags |= ATH9K_HTC_TX_CTSONLY;
319
320 tx_hdr.flags = cpu_to_be32(flags);
321 tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
322 if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
323 tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
324 else
325 tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
326
327 tx_fhdr = skb_push(skb, len: sizeof(tx_hdr));
328 memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
329
330 if (is_cab) {
331 CAB_STAT_INC(priv);
332 tx_ctl->epid = priv->cab_ep;
333 return;
334 }
335
336 qnum = skb_get_queue_mapping(skb);
337 tx_ctl->epid = get_htc_epid(priv, qnum);
338}
339
340int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
341 struct ieee80211_sta *sta,
342 struct sk_buff *skb,
343 u8 slot, bool is_cab)
344{
345 struct ieee80211_hdr *hdr;
346 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
347 struct ieee80211_vif *vif = tx_info->control.vif;
348 struct ath9k_htc_sta *ista;
349 struct ath9k_htc_vif *avp = NULL;
350 u8 sta_idx, vif_idx;
351
352 hdr = (struct ieee80211_hdr *) skb->data;
353
354 /*
355 * Find out on which interface this packet has to be
356 * sent out.
357 */
358 if (vif) {
359 avp = (struct ath9k_htc_vif *) vif->drv_priv;
360 vif_idx = avp->index;
361 } else {
362 if (!priv->ah->is_monitoring) {
363 ath_dbg(ath9k_hw_common(priv->ah), XMIT,
364 "VIF is null, but no monitor interface !\n");
365 return -EINVAL;
366 }
367
368 vif_idx = priv->mon_vif_idx;
369 }
370
371 /*
372 * Find out which station this packet is destined for.
373 */
374 if (sta) {
375 ista = (struct ath9k_htc_sta *) sta->drv_priv;
376 sta_idx = ista->index;
377 } else {
378 sta_idx = priv->vif_sta_pos[vif_idx];
379 }
380
381 if (ieee80211_is_data(fc: hdr->frame_control))
382 ath9k_htc_tx_data(priv, vif, skb,
383 sta_idx, vif_idx, slot, is_cab);
384 else
385 ath9k_htc_tx_mgmt(priv, avp, skb,
386 sta_idx, vif_idx, slot);
387
388
389 return htc_send(target: priv->htc, skb);
390}
391
392static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
393 struct ath9k_htc_sta *ista, u8 tid)
394{
395 bool ret = false;
396
397 spin_lock_bh(lock: &priv->tx.tx_lock);
398 if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
399 ret = true;
400 spin_unlock_bh(lock: &priv->tx.tx_lock);
401
402 return ret;
403}
404
405static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
406 struct ieee80211_vif *vif,
407 struct sk_buff *skb)
408{
409 struct ieee80211_sta *sta;
410 struct ieee80211_hdr *hdr;
411 __le16 fc;
412
413 hdr = (struct ieee80211_hdr *) skb->data;
414 fc = hdr->frame_control;
415
416 rcu_read_lock();
417
418 sta = ieee80211_find_sta(vif, addr: hdr->addr1);
419 if (!sta) {
420 rcu_read_unlock();
421 return;
422 }
423
424 if (sta && conf_is_ht(conf: &priv->hw->conf) &&
425 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
426 if (ieee80211_is_data_qos(fc)) {
427 u8 *qc, tid;
428 struct ath9k_htc_sta *ista;
429
430 qc = ieee80211_get_qos_ctl(hdr);
431 tid = qc[0] & 0xf;
432 ista = (struct ath9k_htc_sta *)sta->drv_priv;
433 if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
434 ieee80211_start_tx_ba_session(sta, tid, timeout: 0);
435 spin_lock_bh(lock: &priv->tx.tx_lock);
436 ista->tid_state[tid] = AGGR_PROGRESS;
437 spin_unlock_bh(lock: &priv->tx.tx_lock);
438 }
439 }
440 }
441
442 rcu_read_unlock();
443}
444
445static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
446 struct sk_buff *skb,
447 struct __wmi_event_txstatus *txs)
448{
449 struct ieee80211_vif *vif;
450 struct ath9k_htc_tx_ctl *tx_ctl;
451 struct ieee80211_tx_info *tx_info;
452 struct ieee80211_tx_rate *rate;
453 struct ieee80211_conf *cur_conf = &priv->hw->conf;
454 bool txok;
455 int slot;
456 int hdrlen, padsize;
457
458 slot = strip_drv_header(priv, skb);
459 if (slot < 0) {
460 dev_kfree_skb_any(skb);
461 return;
462 }
463
464 tx_ctl = HTC_SKB_CB(skb);
465 txok = tx_ctl->txok;
466 tx_info = IEEE80211_SKB_CB(skb);
467 vif = tx_info->control.vif;
468 rate = &tx_info->status.rates[0];
469
470 memset(&tx_info->status, 0, sizeof(tx_info->status));
471
472 /*
473 * URB submission failed for this frame, it never reached
474 * the target.
475 */
476 if (!txok || !vif || !txs)
477 goto send_mac80211;
478
479 if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
480 tx_info->flags |= IEEE80211_TX_STAT_ACK;
481 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
482 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
483 }
484
485 if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
486 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
487
488 if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
489 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
490
491 rate->count = 1;
492 rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
493
494 if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
495 rate->flags |= IEEE80211_TX_RC_MCS;
496
497 if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
498 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
499 if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
500 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
501 } else {
502 if (cur_conf->chandef.chan->band == NL80211_BAND_5GHZ)
503 rate->idx += 4; /* No CCK rates */
504 }
505
506 ath9k_htc_check_tx_aggr(priv, vif, skb);
507
508send_mac80211:
509 spin_lock_bh(lock: &priv->tx.tx_lock);
510 if (WARN_ON(--priv->tx.queued_cnt < 0))
511 priv->tx.queued_cnt = 0;
512 spin_unlock_bh(lock: &priv->tx.tx_lock);
513
514 ath9k_htc_tx_clear_slot(priv, slot);
515
516 /* Remove padding before handing frame back to mac80211 */
517 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
518
519 padsize = hdrlen & 3;
520 if (padsize && skb->len > hdrlen + padsize) {
521 memmove(skb->data + padsize, skb->data, hdrlen);
522 skb_pull(skb, len: padsize);
523 }
524
525 /* Send status to mac80211 */
526 ieee80211_tx_status_skb(hw: priv->hw, skb);
527}
528
529static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
530 struct sk_buff_head *queue)
531{
532 struct sk_buff *skb;
533
534 while ((skb = skb_dequeue(list: queue)) != NULL) {
535 ath9k_htc_tx_process(priv, skb, NULL);
536 }
537}
538
539void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
540{
541 struct ath9k_htc_tx_event *event, *tmp;
542
543 spin_lock_bh(lock: &priv->tx.tx_lock);
544 priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
545 spin_unlock_bh(lock: &priv->tx.tx_lock);
546
547 /*
548 * Ensure that all pending TX frames are flushed,
549 * and that the TX completion/failed tasklets is killed.
550 */
551 htc_stop(target: priv->htc);
552 tasklet_kill(t: &priv->wmi->wmi_event_tasklet);
553 tasklet_kill(t: &priv->tx_failed_tasklet);
554
555 ath9k_htc_tx_drainq(priv, queue: &priv->tx.mgmt_ep_queue);
556 ath9k_htc_tx_drainq(priv, queue: &priv->tx.cab_ep_queue);
557 ath9k_htc_tx_drainq(priv, queue: &priv->tx.data_be_queue);
558 ath9k_htc_tx_drainq(priv, queue: &priv->tx.data_bk_queue);
559 ath9k_htc_tx_drainq(priv, queue: &priv->tx.data_vi_queue);
560 ath9k_htc_tx_drainq(priv, queue: &priv->tx.data_vo_queue);
561 ath9k_htc_tx_drainq(priv, queue: &priv->tx.tx_failed);
562
563 /*
564 * The TX cleanup timer has already been killed.
565 */
566 spin_lock_bh(lock: &priv->wmi->event_lock);
567 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
568 list_del(entry: &event->list);
569 kfree(objp: event);
570 }
571 spin_unlock_bh(lock: &priv->wmi->event_lock);
572
573 spin_lock_bh(lock: &priv->tx.tx_lock);
574 priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
575 spin_unlock_bh(lock: &priv->tx.tx_lock);
576}
577
578void ath9k_tx_failed_tasklet(struct tasklet_struct *t)
579{
580 struct ath9k_htc_priv *priv = from_tasklet(priv, t, tx_failed_tasklet);
581
582 spin_lock(lock: &priv->tx.tx_lock);
583 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
584 spin_unlock(lock: &priv->tx.tx_lock);
585 return;
586 }
587 spin_unlock(lock: &priv->tx.tx_lock);
588
589 ath9k_htc_tx_drainq(priv, queue: &priv->tx.tx_failed);
590}
591
592static inline bool check_cookie(struct ath9k_htc_priv *priv,
593 struct sk_buff *skb,
594 u8 cookie, u8 epid)
595{
596 u8 fcookie = 0;
597
598 if (epid == priv->mgmt_ep) {
599 struct tx_mgmt_hdr *hdr;
600 hdr = (struct tx_mgmt_hdr *) skb->data;
601 fcookie = hdr->cookie;
602 } else if ((epid == priv->data_bk_ep) ||
603 (epid == priv->data_be_ep) ||
604 (epid == priv->data_vi_ep) ||
605 (epid == priv->data_vo_ep) ||
606 (epid == priv->cab_ep)) {
607 struct tx_frame_hdr *hdr;
608 hdr = (struct tx_frame_hdr *) skb->data;
609 fcookie = hdr->cookie;
610 }
611
612 if (fcookie == cookie)
613 return true;
614
615 return false;
616}
617
618static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
619 struct __wmi_event_txstatus *txs)
620{
621 struct ath_common *common = ath9k_hw_common(ah: priv->ah);
622 struct sk_buff_head *epid_queue;
623 struct sk_buff *skb, *tmp;
624 unsigned long flags;
625 u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
626
627 epid_queue = get_htc_epid_queue(priv, epid);
628 if (!epid_queue)
629 return NULL;
630
631 spin_lock_irqsave(&epid_queue->lock, flags);
632 skb_queue_walk_safe(epid_queue, skb, tmp) {
633 if (check_cookie(priv, skb, cookie: txs->cookie, epid)) {
634 __skb_unlink(skb, list: epid_queue);
635 spin_unlock_irqrestore(lock: &epid_queue->lock, flags);
636 return skb;
637 }
638 }
639 spin_unlock_irqrestore(lock: &epid_queue->lock, flags);
640
641 ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
642 txs->cookie, epid);
643
644 return NULL;
645}
646
647void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
648{
649 struct wmi_event_txstatus *txs = wmi_event;
650 struct __wmi_event_txstatus *__txs;
651 struct sk_buff *skb;
652 struct ath9k_htc_tx_event *tx_pend;
653 int i;
654
655 if (WARN_ON_ONCE(txs->cnt > HTC_MAX_TX_STATUS))
656 return;
657
658 for (i = 0; i < txs->cnt; i++) {
659 __txs = &txs->txstatus[i];
660
661 skb = ath9k_htc_tx_get_packet(priv, txs: __txs);
662 if (!skb) {
663 /*
664 * Store this event, so that the TX cleanup
665 * routine can check later for the needed packet.
666 */
667 tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
668 GFP_ATOMIC);
669 if (!tx_pend)
670 continue;
671
672 memcpy(&tx_pend->txs, __txs,
673 sizeof(struct __wmi_event_txstatus));
674
675 spin_lock(lock: &priv->wmi->event_lock);
676 list_add_tail(new: &tx_pend->list,
677 head: &priv->wmi->pending_tx_events);
678 spin_unlock(lock: &priv->wmi->event_lock);
679
680 continue;
681 }
682
683 ath9k_htc_tx_process(priv, skb, txs: __txs);
684 }
685
686 /* Wake TX queues if needed */
687 ath9k_htc_check_wake_queues(priv);
688}
689
690void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
691 enum htc_endpoint_id ep_id, bool txok)
692{
693 struct ath9k_htc_priv *priv = drv_priv;
694 struct ath9k_htc_tx_ctl *tx_ctl;
695 struct sk_buff_head *epid_queue;
696
697 tx_ctl = HTC_SKB_CB(skb);
698 tx_ctl->txok = txok;
699 tx_ctl->timestamp = jiffies;
700
701 if (!txok) {
702 skb_queue_tail(list: &priv->tx.tx_failed, newsk: skb);
703 tasklet_schedule(t: &priv->tx_failed_tasklet);
704 return;
705 }
706
707 epid_queue = get_htc_epid_queue(priv, epid: ep_id);
708 if (!epid_queue) {
709 dev_kfree_skb_any(skb);
710 return;
711 }
712
713 skb_queue_tail(list: epid_queue, newsk: skb);
714}
715
716static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
717{
718 struct ath_common *common = ath9k_hw_common(ah: priv->ah);
719 struct ath9k_htc_tx_ctl *tx_ctl;
720
721 tx_ctl = HTC_SKB_CB(skb);
722
723 if (time_after(jiffies,
724 tx_ctl->timestamp +
725 msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
726 ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
727 return true;
728 }
729
730 return false;
731}
732
733static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
734 struct sk_buff_head *epid_queue)
735{
736 bool process = false;
737 unsigned long flags;
738 struct sk_buff *skb, *tmp;
739 struct sk_buff_head queue;
740
741 skb_queue_head_init(list: &queue);
742
743 spin_lock_irqsave(&epid_queue->lock, flags);
744 skb_queue_walk_safe(epid_queue, skb, tmp) {
745 if (check_packet(priv, skb)) {
746 __skb_unlink(skb, list: epid_queue);
747 __skb_queue_tail(list: &queue, newsk: skb);
748 process = true;
749 }
750 }
751 spin_unlock_irqrestore(lock: &epid_queue->lock, flags);
752
753 if (process) {
754 skb_queue_walk_safe(&queue, skb, tmp) {
755 __skb_unlink(skb, list: &queue);
756 ath9k_htc_tx_process(priv, skb, NULL);
757 }
758 }
759}
760
761void ath9k_htc_tx_cleanup_timer(struct timer_list *t)
762{
763 struct ath9k_htc_priv *priv = timer_container_of(priv, t,
764 tx.cleanup_timer);
765 struct ath_common *common = ath9k_hw_common(ah: priv->ah);
766 struct ath9k_htc_tx_event *event, *tmp;
767 struct sk_buff *skb;
768
769 spin_lock(lock: &priv->wmi->event_lock);
770 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
771
772 skb = ath9k_htc_tx_get_packet(priv, txs: &event->txs);
773 if (skb) {
774 ath_dbg(common, XMIT,
775 "Found packet for cookie: %d, epid: %d\n",
776 event->txs.cookie,
777 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
778
779 ath9k_htc_tx_process(priv, skb, txs: &event->txs);
780 list_del(entry: &event->list);
781 kfree(objp: event);
782 continue;
783 }
784
785 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
786 list_del(entry: &event->list);
787 kfree(objp: event);
788 }
789 }
790 spin_unlock(lock: &priv->wmi->event_lock);
791
792 /*
793 * Check if status-pending packets have to be cleaned up.
794 */
795 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.mgmt_ep_queue);
796 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.cab_ep_queue);
797 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.data_be_queue);
798 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.data_bk_queue);
799 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.data_vi_queue);
800 ath9k_htc_tx_cleanup_queue(priv, epid_queue: &priv->tx.data_vo_queue);
801
802 /* Wake TX queues if needed */
803 ath9k_htc_check_wake_queues(priv);
804
805 mod_timer(timer: &priv->tx.cleanup_timer,
806 expires: jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
807}
808
809int ath9k_tx_init(struct ath9k_htc_priv *priv)
810{
811 skb_queue_head_init(list: &priv->tx.mgmt_ep_queue);
812 skb_queue_head_init(list: &priv->tx.cab_ep_queue);
813 skb_queue_head_init(list: &priv->tx.data_be_queue);
814 skb_queue_head_init(list: &priv->tx.data_bk_queue);
815 skb_queue_head_init(list: &priv->tx.data_vi_queue);
816 skb_queue_head_init(list: &priv->tx.data_vo_queue);
817 skb_queue_head_init(list: &priv->tx.tx_failed);
818
819 return 0;
820}
821
822void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
823{
824
825}
826
827bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
828{
829 struct ath_hw *ah = priv->ah;
830 struct ath_common *common = ath9k_hw_common(ah);
831 struct ath9k_tx_queue_info qi;
832 int qnum;
833
834 memset(&qi, 0, sizeof(qi));
835 ATH9K_HTC_INIT_TXQ(subtype);
836
837 qnum = ath9k_hw_setuptxqueue(ah: priv->ah, type: ATH9K_TX_QUEUE_DATA, qinfo: &qi);
838 if (qnum == -1)
839 return false;
840
841 if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
842 ath_err(common, "qnum %u out of range, max %zu!\n",
843 qnum, ARRAY_SIZE(priv->hwq_map));
844 ath9k_hw_releasetxqueue(ah, q: qnum);
845 return false;
846 }
847
848 priv->hwq_map[subtype] = qnum;
849 return true;
850}
851
852int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
853{
854 struct ath9k_tx_queue_info qi;
855
856 memset(&qi, 0, sizeof(qi));
857 ATH9K_HTC_INIT_TXQ(0);
858
859 return ath9k_hw_setuptxqueue(ah: priv->ah, type: ATH9K_TX_QUEUE_CAB, qinfo: &qi);
860}
861
862/******/
863/* RX */
864/******/
865
866/*
867 * Calculate the RX filter to be set in the HW.
868 */
869u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
870{
871#define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
872
873 struct ath_hw *ah = priv->ah;
874 u32 rfilt;
875
876 rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
877 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
878 | ATH9K_RX_FILTER_MCAST;
879
880 if (priv->rxfilter & FIF_PROBE_REQ)
881 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
882
883 if (ah->is_monitoring)
884 rfilt |= ATH9K_RX_FILTER_PROM;
885
886 if (priv->rxfilter & FIF_CONTROL)
887 rfilt |= ATH9K_RX_FILTER_CONTROL;
888
889 if ((ah->opmode == NL80211_IFTYPE_STATION) &&
890 (priv->nvifs <= 1) &&
891 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
892 rfilt |= ATH9K_RX_FILTER_MYBEACON;
893 else
894 rfilt |= ATH9K_RX_FILTER_BEACON;
895
896 if (conf_is_ht(conf: &priv->hw->conf)) {
897 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
898 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
899 }
900
901 if (priv->rxfilter & FIF_PSPOLL)
902 rfilt |= ATH9K_RX_FILTER_PSPOLL;
903
904 if (priv->nvifs > 1 ||
905 priv->rxfilter & (FIF_OTHER_BSS | FIF_MCAST_ACTION))
906 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
907
908 return rfilt;
909
910#undef RX_FILTER_PRESERVE
911}
912
913/*
914 * Recv initialization for opmode change.
915 */
916static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
917{
918 struct ath_hw *ah = priv->ah;
919 u32 rfilt, mfilt[2];
920
921 /* configure rx filter */
922 rfilt = ath9k_htc_calcrxfilter(priv);
923 ath9k_hw_setrxfilter(ah, bits: rfilt);
924
925 /* calculate and install multicast filter */
926 mfilt[0] = mfilt[1] = ~0;
927 ath9k_hw_setmcastfilter(ah, filter0: mfilt[0], filter1: mfilt[1]);
928}
929
930void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
931{
932 struct ath_common *common = ath9k_hw_common(ah: priv->ah);
933 ath9k_hw_rxena(ah: priv->ah);
934 ath9k_htc_opmode_init(priv);
935 ath9k_hw_startpcureceive(ah: priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
936}
937
938static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
939 struct ath_htc_rx_status *rxstatus)
940{
941 rx_stats->enc_flags = 0;
942 rx_stats->bw = RATE_INFO_BW_20;
943 if (rxstatus->rs_flags & ATH9K_RX_2040)
944 rx_stats->bw = RATE_INFO_BW_40;
945 if (rxstatus->rs_flags & ATH9K_RX_GI)
946 rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
947}
948
949static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
950 struct ath_htc_rx_status *rxstatus)
951{
952 rx_stats->rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
953 rx_stats->rs_status = rxstatus->rs_status;
954 rx_stats->rs_phyerr = rxstatus->rs_phyerr;
955 rx_stats->rs_rssi = rxstatus->rs_rssi;
956 rx_stats->rs_keyix = rxstatus->rs_keyix;
957 rx_stats->rs_rate = rxstatus->rs_rate;
958 rx_stats->rs_antenna = rxstatus->rs_antenna;
959 rx_stats->rs_more = rxstatus->rs_more;
960
961 memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
962 sizeof(rx_stats->rs_rssi_ctl));
963 memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
964 sizeof(rx_stats->rs_rssi_ext));
965
966 rx_stats->rs_isaggr = rxstatus->rs_isaggr;
967 rx_stats->rs_moreaggr = rxstatus->rs_moreaggr;
968 rx_stats->rs_num_delims = rxstatus->rs_num_delims;
969 convert_htc_flag(rx_stats, rxstatus);
970}
971
972static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
973 struct ath9k_htc_rxbuf *rxbuf,
974 struct ieee80211_rx_status *rx_status)
975
976{
977 struct ieee80211_hdr *hdr;
978 struct ieee80211_hw *hw = priv->hw;
979 struct sk_buff *skb = rxbuf->skb;
980 struct ath_common *common = ath9k_hw_common(ah: priv->ah);
981 struct ath_hw *ah = common->ah;
982 struct ath_htc_rx_status *rxstatus;
983 struct ath_rx_status rx_stats;
984 bool decrypt_error = false;
985 u16 rs_datalen;
986 bool is_phyerr;
987
988 if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
989 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
990 skb->len);
991 goto rx_next;
992 }
993
994 rxstatus = (struct ath_htc_rx_status *)skb->data;
995
996 rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
997 if (unlikely(rs_datalen -
998 (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
999 ath_err(common,
1000 "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
1001 rs_datalen, skb->len);
1002 goto rx_next;
1003 }
1004
1005 is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
1006 /*
1007 * Discard zero-length packets and packets smaller than an ACK
1008 * which are not PHY_ERROR (short radar pulses have a length of 3)
1009 */
1010 if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
1011 ath_dbg(common, ANY,
1012 "Short RX data len, dropping (dlen: %d)\n",
1013 rs_datalen);
1014 goto rx_next;
1015 }
1016
1017 if (rxstatus->rs_keyix >= ATH_KEYMAX &&
1018 rxstatus->rs_keyix != ATH9K_RXKEYIX_INVALID) {
1019 ath_dbg(common, ANY,
1020 "Invalid keyix, dropping (keyix: %d)\n",
1021 rxstatus->rs_keyix);
1022 goto rx_next;
1023 }
1024
1025 /* Get the RX status information */
1026
1027 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1028
1029 /* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1030 * After this, we can drop this part of skb. */
1031 rx_status_htc_to_ath(rx_stats: &rx_stats, rxstatus);
1032 ath9k_htc_err_stat_rx(priv, rs: &rx_stats);
1033 rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1034 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1035
1036 /*
1037 * everything but the rate is checked here, the rate check is done
1038 * separately to avoid doing two lookups for a rate for each frame.
1039 */
1040 hdr = (struct ieee80211_hdr *)skb->data;
1041
1042 /*
1043 * Process PHY errors and return so that the packet
1044 * can be dropped.
1045 */
1046 if (unlikely(is_phyerr)) {
1047 /* TODO: Not using DFS processing now. */
1048 if (ath_cmn_process_fft(spec_priv: &priv->spec_priv, hdr,
1049 rs: &rx_stats, tsf: rx_status->mactime)) {
1050 /* TODO: Code to collect spectral scan statistics */
1051 }
1052 goto rx_next;
1053 }
1054
1055 if (!ath9k_cmn_rx_accept(common, hdr, rxs: rx_status, rx_stats: &rx_stats,
1056 decrypt_error: &decrypt_error, rxfilter: priv->rxfilter))
1057 goto rx_next;
1058
1059 ath9k_cmn_rx_skb_postprocess(common, skb, rx_stats: &rx_stats,
1060 rxs: rx_status, decrypt_error);
1061
1062 if (ath9k_cmn_process_rate(common, hw, rx_stats: &rx_stats, rxs: rx_status))
1063 goto rx_next;
1064
1065 rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1066 ath9k_cmn_process_rssi(common, hw, rx_stats: &rx_stats, rxs: rx_status);
1067
1068 rx_status->band = ah->curchan->chan->band;
1069 rx_status->freq = ah->curchan->chan->center_freq;
1070 rx_status->antenna = rx_stats.rs_antenna;
1071 rx_status->flag |= RX_FLAG_MACTIME_END;
1072
1073 return true;
1074rx_next:
1075 return false;
1076}
1077
1078/*
1079 * FIXME: Handle FLUSH later on.
1080 */
1081void ath9k_rx_tasklet(struct tasklet_struct *t)
1082{
1083 struct ath9k_htc_priv *priv = from_tasklet(priv, t, rx_tasklet);
1084 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1085 struct ieee80211_rx_status rx_status;
1086 struct sk_buff *skb;
1087 unsigned long flags;
1088 struct ieee80211_hdr *hdr;
1089
1090 do {
1091 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1092 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1093 if (tmp_buf->in_process) {
1094 rxbuf = tmp_buf;
1095 break;
1096 }
1097 }
1098
1099 if (rxbuf == NULL) {
1100 spin_unlock_irqrestore(lock: &priv->rx.rxbuflock, flags);
1101 break;
1102 }
1103
1104 if (!rxbuf->skb)
1105 goto requeue;
1106
1107 if (!ath9k_rx_prepare(priv, rxbuf, rx_status: &rx_status)) {
1108 dev_kfree_skb_any(skb: rxbuf->skb);
1109 goto requeue;
1110 }
1111
1112 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1113 sizeof(struct ieee80211_rx_status));
1114 skb = rxbuf->skb;
1115 hdr = (struct ieee80211_hdr *) skb->data;
1116
1117 if (ieee80211_is_beacon(fc: hdr->frame_control) && priv->ps_enabled)
1118 ieee80211_queue_work(hw: priv->hw, work: &priv->ps_work);
1119
1120 spin_unlock_irqrestore(lock: &priv->rx.rxbuflock, flags);
1121
1122 ieee80211_rx(hw: priv->hw, skb);
1123
1124 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1125requeue:
1126 rxbuf->in_process = false;
1127 rxbuf->skb = NULL;
1128 list_move_tail(list: &rxbuf->list, head: &priv->rx.rxbuf);
1129 rxbuf = NULL;
1130 spin_unlock_irqrestore(lock: &priv->rx.rxbuflock, flags);
1131 } while (1);
1132
1133}
1134
1135void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1136 enum htc_endpoint_id ep_id)
1137{
1138 struct ath9k_htc_priv *priv = drv_priv;
1139 struct ath_hw *ah = priv->ah;
1140 struct ath_common *common = ath9k_hw_common(ah);
1141 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1142 unsigned long flags;
1143
1144 /* Check if ath9k_rx_init() completed. */
1145 if (!data_race(priv->rx.initialized))
1146 goto err;
1147
1148 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1149 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1150 if (!tmp_buf->in_process) {
1151 rxbuf = tmp_buf;
1152 break;
1153 }
1154 }
1155 spin_unlock_irqrestore(lock: &priv->rx.rxbuflock, flags);
1156
1157 if (rxbuf == NULL) {
1158 ath_dbg(common, ANY, "No free RX buffer\n");
1159 goto err;
1160 }
1161
1162 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1163 rxbuf->skb = skb;
1164 rxbuf->in_process = true;
1165 spin_unlock_irqrestore(lock: &priv->rx.rxbuflock, flags);
1166
1167 tasklet_schedule(t: &priv->rx_tasklet);
1168 return;
1169err:
1170 dev_kfree_skb_any(skb);
1171}
1172
1173/* FIXME: Locking for cleanup/init */
1174
1175void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1176{
1177 struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1178
1179 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1180 list_del(entry: &rxbuf->list);
1181 if (rxbuf->skb)
1182 dev_kfree_skb_any(skb: rxbuf->skb);
1183 kfree(objp: rxbuf);
1184 }
1185}
1186
1187int ath9k_rx_init(struct ath9k_htc_priv *priv)
1188{
1189 int i = 0;
1190
1191 INIT_LIST_HEAD(list: &priv->rx.rxbuf);
1192 spin_lock_init(&priv->rx.rxbuflock);
1193
1194 for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1195 struct ath9k_htc_rxbuf *rxbuf =
1196 kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1197 if (rxbuf == NULL)
1198 goto err;
1199
1200 list_add_tail(new: &rxbuf->list, head: &priv->rx.rxbuf);
1201 }
1202
1203 /* Allow ath9k_htc_rxep() to operate. */
1204 smp_wmb();
1205 priv->rx.initialized = true;
1206
1207 return 0;
1208
1209err:
1210 ath9k_rx_cleanup(priv);
1211 return -ENOMEM;
1212}
1213

source code of linux/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c