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Merge tag 'efi-urgent' into x86/urgent
[deliverable/linux.git] / drivers / net / wireless / ath / ath9k / htc_drv_txrx.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 /******/
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
477 if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
478 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
479
480 if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
481 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
482
483 rate->count = 1;
484 rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
485
486 if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
487 rate->flags |= IEEE80211_TX_RC_MCS;
488
489 if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
490 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
491 if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
492 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
493 } else {
494 if (cur_conf->chandef.chan->band == IEEE80211_BAND_5GHZ)
495 rate->idx += 4; /* No CCK rates */
496 }
497
498 ath9k_htc_check_tx_aggr(priv, vif, skb);
499
500 send_mac80211:
501 spin_lock_bh(&priv->tx.tx_lock);
502 if (WARN_ON(--priv->tx.queued_cnt < 0))
503 priv->tx.queued_cnt = 0;
504 spin_unlock_bh(&priv->tx.tx_lock);
505
506 ath9k_htc_tx_clear_slot(priv, slot);
507
508 /* Remove padding before handing frame back to mac80211 */
509 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
510
511 padsize = hdrlen & 3;
512 if (padsize && skb->len > hdrlen + padsize) {
513 memmove(skb->data + padsize, skb->data, hdrlen);
514 skb_pull(skb, padsize);
515 }
516
517 /* Send status to mac80211 */
518 ieee80211_tx_status(priv->hw, skb);
519 }
520
521 static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
522 struct sk_buff_head *queue)
523 {
524 struct sk_buff *skb;
525
526 while ((skb = skb_dequeue(queue)) != NULL) {
527 ath9k_htc_tx_process(priv, skb, NULL);
528 }
529 }
530
531 void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
532 {
533 struct ath9k_htc_tx_event *event, *tmp;
534
535 spin_lock_bh(&priv->tx.tx_lock);
536 priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
537 spin_unlock_bh(&priv->tx.tx_lock);
538
539 /*
540 * Ensure that all pending TX frames are flushed,
541 * and that the TX completion/failed tasklets is killed.
542 */
543 htc_stop(priv->htc);
544 tasklet_kill(&priv->wmi->wmi_event_tasklet);
545 tasklet_kill(&priv->tx_failed_tasklet);
546
547 ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
548 ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
549 ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
550 ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
551 ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
552 ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
553 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
554
555 /*
556 * The TX cleanup timer has already been killed.
557 */
558 spin_lock_bh(&priv->wmi->event_lock);
559 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
560 list_del(&event->list);
561 kfree(event);
562 }
563 spin_unlock_bh(&priv->wmi->event_lock);
564
565 spin_lock_bh(&priv->tx.tx_lock);
566 priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
567 spin_unlock_bh(&priv->tx.tx_lock);
568 }
569
570 void ath9k_tx_failed_tasklet(unsigned long data)
571 {
572 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
573
574 spin_lock_bh(&priv->tx.tx_lock);
575 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
576 spin_unlock_bh(&priv->tx.tx_lock);
577 return;
578 }
579 spin_unlock_bh(&priv->tx.tx_lock);
580
581 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
582 }
583
584 static inline bool check_cookie(struct ath9k_htc_priv *priv,
585 struct sk_buff *skb,
586 u8 cookie, u8 epid)
587 {
588 u8 fcookie = 0;
589
590 if (epid == priv->mgmt_ep) {
591 struct tx_mgmt_hdr *hdr;
592 hdr = (struct tx_mgmt_hdr *) skb->data;
593 fcookie = hdr->cookie;
594 } else if ((epid == priv->data_bk_ep) ||
595 (epid == priv->data_be_ep) ||
596 (epid == priv->data_vi_ep) ||
597 (epid == priv->data_vo_ep) ||
598 (epid == priv->cab_ep)) {
599 struct tx_frame_hdr *hdr;
600 hdr = (struct tx_frame_hdr *) skb->data;
601 fcookie = hdr->cookie;
602 }
603
604 if (fcookie == cookie)
605 return true;
606
607 return false;
608 }
609
610 static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
611 struct __wmi_event_txstatus *txs)
612 {
613 struct ath_common *common = ath9k_hw_common(priv->ah);
614 struct sk_buff_head *epid_queue;
615 struct sk_buff *skb, *tmp;
616 unsigned long flags;
617 u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
618
619 epid_queue = get_htc_epid_queue(priv, epid);
620 if (!epid_queue)
621 return NULL;
622
623 spin_lock_irqsave(&epid_queue->lock, flags);
624 skb_queue_walk_safe(epid_queue, skb, tmp) {
625 if (check_cookie(priv, skb, txs->cookie, epid)) {
626 __skb_unlink(skb, epid_queue);
627 spin_unlock_irqrestore(&epid_queue->lock, flags);
628 return skb;
629 }
630 }
631 spin_unlock_irqrestore(&epid_queue->lock, flags);
632
633 ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
634 txs->cookie, epid);
635
636 return NULL;
637 }
638
639 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
640 {
641 struct wmi_event_txstatus *txs = (struct wmi_event_txstatus *)wmi_event;
642 struct __wmi_event_txstatus *__txs;
643 struct sk_buff *skb;
644 struct ath9k_htc_tx_event *tx_pend;
645 int i;
646
647 for (i = 0; i < txs->cnt; i++) {
648 WARN_ON(txs->cnt > HTC_MAX_TX_STATUS);
649
650 __txs = &txs->txstatus[i];
651
652 skb = ath9k_htc_tx_get_packet(priv, __txs);
653 if (!skb) {
654 /*
655 * Store this event, so that the TX cleanup
656 * routine can check later for the needed packet.
657 */
658 tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
659 GFP_ATOMIC);
660 if (!tx_pend)
661 continue;
662
663 memcpy(&tx_pend->txs, __txs,
664 sizeof(struct __wmi_event_txstatus));
665
666 spin_lock(&priv->wmi->event_lock);
667 list_add_tail(&tx_pend->list,
668 &priv->wmi->pending_tx_events);
669 spin_unlock(&priv->wmi->event_lock);
670
671 continue;
672 }
673
674 ath9k_htc_tx_process(priv, skb, __txs);
675 }
676
677 /* Wake TX queues if needed */
678 ath9k_htc_check_wake_queues(priv);
679 }
680
681 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
682 enum htc_endpoint_id ep_id, bool txok)
683 {
684 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
685 struct ath9k_htc_tx_ctl *tx_ctl;
686 struct sk_buff_head *epid_queue;
687
688 tx_ctl = HTC_SKB_CB(skb);
689 tx_ctl->txok = txok;
690 tx_ctl->timestamp = jiffies;
691
692 if (!txok) {
693 skb_queue_tail(&priv->tx.tx_failed, skb);
694 tasklet_schedule(&priv->tx_failed_tasklet);
695 return;
696 }
697
698 epid_queue = get_htc_epid_queue(priv, ep_id);
699 if (!epid_queue) {
700 dev_kfree_skb_any(skb);
701 return;
702 }
703
704 skb_queue_tail(epid_queue, skb);
705 }
706
707 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
708 {
709 struct ath_common *common = ath9k_hw_common(priv->ah);
710 struct ath9k_htc_tx_ctl *tx_ctl;
711
712 tx_ctl = HTC_SKB_CB(skb);
713
714 if (time_after(jiffies,
715 tx_ctl->timestamp +
716 msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
717 ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
718 return true;
719 }
720
721 return false;
722 }
723
724 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
725 struct sk_buff_head *epid_queue)
726 {
727 bool process = false;
728 unsigned long flags;
729 struct sk_buff *skb, *tmp;
730 struct sk_buff_head queue;
731
732 skb_queue_head_init(&queue);
733
734 spin_lock_irqsave(&epid_queue->lock, flags);
735 skb_queue_walk_safe(epid_queue, skb, tmp) {
736 if (check_packet(priv, skb)) {
737 __skb_unlink(skb, epid_queue);
738 __skb_queue_tail(&queue, skb);
739 process = true;
740 }
741 }
742 spin_unlock_irqrestore(&epid_queue->lock, flags);
743
744 if (process) {
745 skb_queue_walk_safe(&queue, skb, tmp) {
746 __skb_unlink(skb, &queue);
747 ath9k_htc_tx_process(priv, skb, NULL);
748 }
749 }
750 }
751
752 void ath9k_htc_tx_cleanup_timer(unsigned long data)
753 {
754 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) data;
755 struct ath_common *common = ath9k_hw_common(priv->ah);
756 struct ath9k_htc_tx_event *event, *tmp;
757 struct sk_buff *skb;
758
759 spin_lock(&priv->wmi->event_lock);
760 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
761
762 skb = ath9k_htc_tx_get_packet(priv, &event->txs);
763 if (skb) {
764 ath_dbg(common, XMIT,
765 "Found packet for cookie: %d, epid: %d\n",
766 event->txs.cookie,
767 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
768
769 ath9k_htc_tx_process(priv, skb, &event->txs);
770 list_del(&event->list);
771 kfree(event);
772 continue;
773 }
774
775 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
776 list_del(&event->list);
777 kfree(event);
778 }
779 }
780 spin_unlock(&priv->wmi->event_lock);
781
782 /*
783 * Check if status-pending packets have to be cleaned up.
784 */
785 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
786 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
787 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
788 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
789 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
790 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
791
792 /* Wake TX queues if needed */
793 ath9k_htc_check_wake_queues(priv);
794
795 mod_timer(&priv->tx.cleanup_timer,
796 jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
797 }
798
799 int ath9k_tx_init(struct ath9k_htc_priv *priv)
800 {
801 skb_queue_head_init(&priv->tx.mgmt_ep_queue);
802 skb_queue_head_init(&priv->tx.cab_ep_queue);
803 skb_queue_head_init(&priv->tx.data_be_queue);
804 skb_queue_head_init(&priv->tx.data_bk_queue);
805 skb_queue_head_init(&priv->tx.data_vi_queue);
806 skb_queue_head_init(&priv->tx.data_vo_queue);
807 skb_queue_head_init(&priv->tx.tx_failed);
808 return 0;
809 }
810
811 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
812 {
813
814 }
815
816 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
817 {
818 struct ath_hw *ah = priv->ah;
819 struct ath_common *common = ath9k_hw_common(ah);
820 struct ath9k_tx_queue_info qi;
821 int qnum;
822
823 memset(&qi, 0, sizeof(qi));
824 ATH9K_HTC_INIT_TXQ(subtype);
825
826 qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
827 if (qnum == -1)
828 return false;
829
830 if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
831 ath_err(common, "qnum %u out of range, max %zu!\n",
832 qnum, ARRAY_SIZE(priv->hwq_map));
833 ath9k_hw_releasetxqueue(ah, qnum);
834 return false;
835 }
836
837 priv->hwq_map[subtype] = qnum;
838 return true;
839 }
840
841 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
842 {
843 struct ath9k_tx_queue_info qi;
844
845 memset(&qi, 0, sizeof(qi));
846 ATH9K_HTC_INIT_TXQ(0);
847
848 return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
849 }
850
851 /******/
852 /* RX */
853 /******/
854
855 /*
856 * Calculate the RX filter to be set in the HW.
857 */
858 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
859 {
860 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
861
862 struct ath_hw *ah = priv->ah;
863 u32 rfilt;
864
865 rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
866 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
867 | ATH9K_RX_FILTER_MCAST;
868
869 if (priv->rxfilter & FIF_PROBE_REQ)
870 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
871
872 /*
873 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
874 * mode interface or when in monitor mode. AP mode does not need this
875 * since it receives all in-BSS frames anyway.
876 */
877 if (((ah->opmode != NL80211_IFTYPE_AP) &&
878 (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
879 ah->is_monitoring)
880 rfilt |= ATH9K_RX_FILTER_PROM;
881
882 if (priv->rxfilter & FIF_CONTROL)
883 rfilt |= ATH9K_RX_FILTER_CONTROL;
884
885 if ((ah->opmode == NL80211_IFTYPE_STATION) &&
886 (priv->nvifs <= 1) &&
887 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
888 rfilt |= ATH9K_RX_FILTER_MYBEACON;
889 else
890 rfilt |= ATH9K_RX_FILTER_BEACON;
891
892 if (conf_is_ht(&priv->hw->conf)) {
893 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
894 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
895 }
896
897 if (priv->rxfilter & FIF_PSPOLL)
898 rfilt |= ATH9K_RX_FILTER_PSPOLL;
899
900 if (priv->nvifs > 1 || priv->rxfilter & FIF_OTHER_BSS)
901 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
902
903 return rfilt;
904
905 #undef RX_FILTER_PRESERVE
906 }
907
908 /*
909 * Recv initialization for opmode change.
910 */
911 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
912 {
913 struct ath_hw *ah = priv->ah;
914 u32 rfilt, mfilt[2];
915
916 /* configure rx filter */
917 rfilt = ath9k_htc_calcrxfilter(priv);
918 ath9k_hw_setrxfilter(ah, rfilt);
919
920 /* calculate and install multicast filter */
921 mfilt[0] = mfilt[1] = ~0;
922 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
923 }
924
925 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
926 {
927 ath9k_hw_rxena(priv->ah);
928 ath9k_htc_opmode_init(priv);
929 ath9k_hw_startpcureceive(priv->ah, test_bit(OP_SCANNING, &priv->op_flags));
930 priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
931 }
932
933 static void ath9k_process_rate(struct ieee80211_hw *hw,
934 struct ieee80211_rx_status *rxs,
935 u8 rx_rate, u8 rs_flags)
936 {
937 struct ieee80211_supported_band *sband;
938 enum ieee80211_band band;
939 unsigned int i = 0;
940
941 if (rx_rate & 0x80) {
942 /* HT rate */
943 rxs->flag |= RX_FLAG_HT;
944 if (rs_flags & ATH9K_RX_2040)
945 rxs->flag |= RX_FLAG_40MHZ;
946 if (rs_flags & ATH9K_RX_GI)
947 rxs->flag |= RX_FLAG_SHORT_GI;
948 rxs->rate_idx = rx_rate & 0x7f;
949 return;
950 }
951
952 band = hw->conf.chandef.chan->band;
953 sband = hw->wiphy->bands[band];
954
955 for (i = 0; i < sband->n_bitrates; i++) {
956 if (sband->bitrates[i].hw_value == rx_rate) {
957 rxs->rate_idx = i;
958 return;
959 }
960 if (sband->bitrates[i].hw_value_short == rx_rate) {
961 rxs->rate_idx = i;
962 rxs->flag |= RX_FLAG_SHORTPRE;
963 return;
964 }
965 }
966
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_htc_rx_status *rxstatus;
979 int hdrlen, padsize;
980 int last_rssi = ATH_RSSI_DUMMY_MARKER;
981 __le16 fc;
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 ath9k_htc_err_stat_rx(priv, rxstatus);
1000
1001 /* Get the RX status information */
1002 memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
1003 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1004
1005 hdr = (struct ieee80211_hdr *)skb->data;
1006 fc = hdr->frame_control;
1007 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1008
1009 padsize = hdrlen & 3;
1010 if (padsize && skb->len >= hdrlen+padsize+FCS_LEN) {
1011 memmove(skb->data + padsize, skb->data, hdrlen);
1012 skb_pull(skb, padsize);
1013 }
1014
1015 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1016
1017 if (rxbuf->rxstatus.rs_status != 0) {
1018 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
1019 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
1020 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
1021 goto rx_next;
1022
1023 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
1024 /* FIXME */
1025 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
1026 if (ieee80211_is_ctl(fc))
1027 /*
1028 * Sometimes, we get invalid
1029 * MIC failures on valid control frames.
1030 * Remove these mic errors.
1031 */
1032 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
1033 else
1034 rx_status->flag |= RX_FLAG_MMIC_ERROR;
1035 }
1036
1037 /*
1038 * Reject error frames with the exception of
1039 * decryption and MIC failures. For monitor mode,
1040 * we also ignore the CRC error.
1041 */
1042 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
1043 if (rxbuf->rxstatus.rs_status &
1044 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
1045 ATH9K_RXERR_CRC))
1046 goto rx_next;
1047 } else {
1048 if (rxbuf->rxstatus.rs_status &
1049 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
1050 goto rx_next;
1051 }
1052 }
1053 }
1054
1055 if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
1056 u8 keyix;
1057 keyix = rxbuf->rxstatus.rs_keyix;
1058 if (keyix != ATH9K_RXKEYIX_INVALID) {
1059 rx_status->flag |= RX_FLAG_DECRYPTED;
1060 } else if (ieee80211_has_protected(fc) &&
1061 skb->len >= hdrlen + 4) {
1062 keyix = skb->data[hdrlen + 3] >> 6;
1063 if (test_bit(keyix, common->keymap))
1064 rx_status->flag |= RX_FLAG_DECRYPTED;
1065 }
1066 }
1067
1068 ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
1069 rxbuf->rxstatus.rs_flags);
1070
1071 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
1072 !rxbuf->rxstatus.rs_moreaggr)
1073 ATH_RSSI_LPF(priv->rx.last_rssi,
1074 rxbuf->rxstatus.rs_rssi);
1075
1076 last_rssi = priv->rx.last_rssi;
1077
1078 if (ath_is_mybeacon(common, hdr)) {
1079 s8 rssi = rxbuf->rxstatus.rs_rssi;
1080
1081 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
1082 rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER);
1083
1084 if (rssi < 0)
1085 rssi = 0;
1086
1087 priv->ah->stats.avgbrssi = rssi;
1088 }
1089
1090 rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
1091 rx_status->band = hw->conf.chandef.chan->band;
1092 rx_status->freq = hw->conf.chandef.chan->center_freq;
1093 rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
1094 rx_status->antenna = rxbuf->rxstatus.rs_antenna;
1095 rx_status->flag |= RX_FLAG_MACTIME_END;
1096
1097 return true;
1098
1099 rx_next:
1100 return false;
1101 }
1102
1103 /*
1104 * FIXME: Handle FLUSH later on.
1105 */
1106 void ath9k_rx_tasklet(unsigned long data)
1107 {
1108 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
1109 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1110 struct ieee80211_rx_status rx_status;
1111 struct sk_buff *skb;
1112 unsigned long flags;
1113 struct ieee80211_hdr *hdr;
1114
1115 do {
1116 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1117 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1118 if (tmp_buf->in_process) {
1119 rxbuf = tmp_buf;
1120 break;
1121 }
1122 }
1123
1124 if (rxbuf == NULL) {
1125 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1126 break;
1127 }
1128
1129 if (!rxbuf->skb)
1130 goto requeue;
1131
1132 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1133 dev_kfree_skb_any(rxbuf->skb);
1134 goto requeue;
1135 }
1136
1137 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1138 sizeof(struct ieee80211_rx_status));
1139 skb = rxbuf->skb;
1140 hdr = (struct ieee80211_hdr *) skb->data;
1141
1142 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1143 ieee80211_queue_work(priv->hw, &priv->ps_work);
1144
1145 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1146
1147 ieee80211_rx(priv->hw, skb);
1148
1149 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1150 requeue:
1151 rxbuf->in_process = false;
1152 rxbuf->skb = NULL;
1153 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1154 rxbuf = NULL;
1155 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1156 } while (1);
1157
1158 }
1159
1160 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1161 enum htc_endpoint_id ep_id)
1162 {
1163 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
1164 struct ath_hw *ah = priv->ah;
1165 struct ath_common *common = ath9k_hw_common(ah);
1166 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1167
1168 spin_lock(&priv->rx.rxbuflock);
1169 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1170 if (!tmp_buf->in_process) {
1171 rxbuf = tmp_buf;
1172 break;
1173 }
1174 }
1175 spin_unlock(&priv->rx.rxbuflock);
1176
1177 if (rxbuf == NULL) {
1178 ath_dbg(common, ANY, "No free RX buffer\n");
1179 goto err;
1180 }
1181
1182 spin_lock(&priv->rx.rxbuflock);
1183 rxbuf->skb = skb;
1184 rxbuf->in_process = true;
1185 spin_unlock(&priv->rx.rxbuflock);
1186
1187 tasklet_schedule(&priv->rx_tasklet);
1188 return;
1189 err:
1190 dev_kfree_skb_any(skb);
1191 }
1192
1193 /* FIXME: Locking for cleanup/init */
1194
1195 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1196 {
1197 struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1198
1199 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1200 list_del(&rxbuf->list);
1201 if (rxbuf->skb)
1202 dev_kfree_skb_any(rxbuf->skb);
1203 kfree(rxbuf);
1204 }
1205 }
1206
1207 int ath9k_rx_init(struct ath9k_htc_priv *priv)
1208 {
1209 int i = 0;
1210
1211 INIT_LIST_HEAD(&priv->rx.rxbuf);
1212 spin_lock_init(&priv->rx.rxbuflock);
1213
1214 for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1215 struct ath9k_htc_rxbuf *rxbuf =
1216 kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1217 if (rxbuf == NULL)
1218 goto err;
1219
1220 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1221 }
1222
1223 return 0;
1224
1225 err:
1226 ath9k_rx_cleanup(priv);
1227 return -ENOMEM;
1228 }
Linux kernel - Deliverables
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