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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / wireless / ath / ath9k / htc_drv_txrx.c
blob9cec5c216e1ffda7b8c7291104ed02d6620a18e5
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 == NL80211_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(&priv->tx.tx_lock);
578 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
579 spin_unlock(&priv->tx.tx_lock);
580 return;
581 }
582 spin_unlock(&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 = 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 = 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(struct timer_list *t)
756 {
757 struct ath9k_htc_priv *priv = from_timer(priv, t, tx.cleanup_timer);
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 if (ah->is_monitoring)
876 rfilt |= ATH9K_RX_FILTER_PROM;
877
878 if (priv->rxfilter & FIF_CONTROL)
879 rfilt |= ATH9K_RX_FILTER_CONTROL;
880
881 if ((ah->opmode == NL80211_IFTYPE_STATION) &&
882 (priv->nvifs <= 1) &&
883 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
884 rfilt |= ATH9K_RX_FILTER_MYBEACON;
885 else
886 rfilt |= ATH9K_RX_FILTER_BEACON;
887
888 if (conf_is_ht(&priv->hw->conf)) {
889 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
890 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
891 }
892
893 if (priv->rxfilter & FIF_PSPOLL)
894 rfilt |= ATH9K_RX_FILTER_PSPOLL;
895
896 if (priv->nvifs > 1 || priv->rxfilter & FIF_OTHER_BSS)
897 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
898
899 return rfilt;
900
901 #undef RX_FILTER_PRESERVE
902 }
903
904 /*
905 * Recv initialization for opmode change.
906 */
907 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
908 {
909 struct ath_hw *ah = priv->ah;
910 u32 rfilt, mfilt[2];
911
912 /* configure rx filter */
913 rfilt = ath9k_htc_calcrxfilter(priv);
914 ath9k_hw_setrxfilter(ah, rfilt);
915
916 /* calculate and install multicast filter */
917 mfilt[0] = mfilt[1] = ~0;
918 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
919 }
920
921 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
922 {
923 struct ath_common *common = ath9k_hw_common(priv->ah);
924 ath9k_hw_rxena(priv->ah);
925 ath9k_htc_opmode_init(priv);
926 ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
927 }
928
929 static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
930 struct ath_htc_rx_status *rxstatus)
931 {
932 rx_stats->enc_flags = 0;
933 rx_stats->bw = RATE_INFO_BW_20;
934 if (rxstatus->rs_flags & ATH9K_RX_2040)
935 rx_stats->bw = RATE_INFO_BW_40;
936 if (rxstatus->rs_flags & ATH9K_RX_GI)
937 rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
938 }
939
940 static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
941 struct ath_htc_rx_status *rxstatus)
942 {
943 rx_stats->rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
944 rx_stats->rs_status = rxstatus->rs_status;
945 rx_stats->rs_phyerr = rxstatus->rs_phyerr;
946 rx_stats->rs_rssi = rxstatus->rs_rssi;
947 rx_stats->rs_keyix = rxstatus->rs_keyix;
948 rx_stats->rs_rate = rxstatus->rs_rate;
949 rx_stats->rs_antenna = rxstatus->rs_antenna;
950 rx_stats->rs_more = rxstatus->rs_more;
951
952 memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
953 sizeof(rx_stats->rs_rssi_ctl));
954 memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
955 sizeof(rx_stats->rs_rssi_ext));
956
957 rx_stats->rs_isaggr = rxstatus->rs_isaggr;
958 rx_stats->rs_moreaggr = rxstatus->rs_moreaggr;
959 rx_stats->rs_num_delims = rxstatus->rs_num_delims;
960 convert_htc_flag(rx_stats, rxstatus);
961 }
962
963 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
964 struct ath9k_htc_rxbuf *rxbuf,
965 struct ieee80211_rx_status *rx_status)
966
967 {
968 struct ieee80211_hdr *hdr;
969 struct ieee80211_hw *hw = priv->hw;
970 struct sk_buff *skb = rxbuf->skb;
971 struct ath_common *common = ath9k_hw_common(priv->ah);
972 struct ath_hw *ah = common->ah;
973 struct ath_htc_rx_status *rxstatus;
974 struct ath_rx_status rx_stats;
975 bool decrypt_error = false;
976 __be16 rs_datalen;
977 bool is_phyerr;
978
979 if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
980 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
981 skb->len);
982 goto rx_next;
983 }
984
985 rxstatus = (struct ath_htc_rx_status *)skb->data;
986
987 rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
988 if (unlikely(rs_datalen -
989 (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
990 ath_err(common,
991 "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
992 rs_datalen, skb->len);
993 goto rx_next;
994 }
995
996 is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
997 /*
998 * Discard zero-length packets and packets smaller than an ACK
999 * which are not PHY_ERROR (short radar pulses have a length of 3)
1000 */
1001 if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
1002 ath_warn(common,
1003 "Short RX data len, dropping (dlen: %d)\n",
1004 rs_datalen);
1005 goto rx_next;
1006 }
1007
1008 /* Get the RX status information */
1009
1010 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1011
1012 /* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1013 * After this, we can drop this part of skb. */
1014 rx_status_htc_to_ath(&rx_stats, rxstatus);
1015 ath9k_htc_err_stat_rx(priv, &rx_stats);
1016 rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1017 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1018
1019 /*
1020 * everything but the rate is checked here, the rate check is done
1021 * separately to avoid doing two lookups for a rate for each frame.
1022 */
1023 hdr = (struct ieee80211_hdr *)skb->data;
1024
1025 /*
1026 * Process PHY errors and return so that the packet
1027 * can be dropped.
1028 */
1029 if (unlikely(is_phyerr)) {
1030 /* TODO: Not using DFS processing now. */
1031 if (ath_cmn_process_fft(&priv->spec_priv, hdr,
1032 &rx_stats, rx_status->mactime)) {
1033 /* TODO: Code to collect spectral scan statistics */
1034 }
1035 goto rx_next;
1036 }
1037
1038 if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
1039 &decrypt_error, priv->rxfilter))
1040 goto rx_next;
1041
1042 ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
1043 rx_status, decrypt_error);
1044
1045 if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
1046 goto rx_next;
1047
1048 rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1049 ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
1050
1051 rx_status->band = ah->curchan->chan->band;
1052 rx_status->freq = ah->curchan->chan->center_freq;
1053 rx_status->antenna = rx_stats.rs_antenna;
1054 rx_status->flag |= RX_FLAG_MACTIME_END;
1055
1056 return true;
1057 rx_next:
1058 return false;
1059 }
1060
1061 /*
1062 * FIXME: Handle FLUSH later on.
1063 */
1064 void ath9k_rx_tasklet(unsigned long data)
1065 {
1066 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
1067 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1068 struct ieee80211_rx_status rx_status;
1069 struct sk_buff *skb;
1070 unsigned long flags;
1071 struct ieee80211_hdr *hdr;
1072
1073 do {
1074 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1075 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1076 if (tmp_buf->in_process) {
1077 rxbuf = tmp_buf;
1078 break;
1079 }
1080 }
1081
1082 if (rxbuf == NULL) {
1083 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1084 break;
1085 }
1086
1087 if (!rxbuf->skb)
1088 goto requeue;
1089
1090 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1091 dev_kfree_skb_any(rxbuf->skb);
1092 goto requeue;
1093 }
1094
1095 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1096 sizeof(struct ieee80211_rx_status));
1097 skb = rxbuf->skb;
1098 hdr = (struct ieee80211_hdr *) skb->data;
1099
1100 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1101 ieee80211_queue_work(priv->hw, &priv->ps_work);
1102
1103 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1104
1105 ieee80211_rx(priv->hw, skb);
1106
1107 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1108 requeue:
1109 rxbuf->in_process = false;
1110 rxbuf->skb = NULL;
1111 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1112 rxbuf = NULL;
1113 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1114 } while (1);
1115
1116 }
1117
1118 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1119 enum htc_endpoint_id ep_id)
1120 {
1121 struct ath9k_htc_priv *priv = drv_priv;
1122 struct ath_hw *ah = priv->ah;
1123 struct ath_common *common = ath9k_hw_common(ah);
1124 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1125 unsigned long flags;
1126
1127 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1128 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1129 if (!tmp_buf->in_process) {
1130 rxbuf = tmp_buf;
1131 break;
1132 }
1133 }
1134 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1135
1136 if (rxbuf == NULL) {
1137 ath_dbg(common, ANY, "No free RX buffer\n");
1138 goto err;
1139 }
1140
1141 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1142 rxbuf->skb = skb;
1143 rxbuf->in_process = true;
1144 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1145
1146 tasklet_schedule(&priv->rx_tasklet);
1147 return;
1148 err:
1149 dev_kfree_skb_any(skb);
1150 }
1151
1152 /* FIXME: Locking for cleanup/init */
1153
1154 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1155 {
1156 struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1157
1158 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1159 list_del(&rxbuf->list);
1160 if (rxbuf->skb)
1161 dev_kfree_skb_any(rxbuf->skb);
1162 kfree(rxbuf);
1163 }
1164 }
1165
1166 int ath9k_rx_init(struct ath9k_htc_priv *priv)
1167 {
1168 int i = 0;
1169
1170 INIT_LIST_HEAD(&priv->rx.rxbuf);
1171 spin_lock_init(&priv->rx.rxbuflock);
1172
1173 for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1174 struct ath9k_htc_rxbuf *rxbuf =
1175 kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1176 if (rxbuf == NULL)
1177 goto err;
1178
1179 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1180 }
1181
1182 return 0;
1183
1184 err:
1185 ath9k_rx_cleanup(priv);
1186 return -ENOMEM;
1187 }
Linux with added FPC-III support