Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / drivers / net / wireless / ath / ath9k / htc_drv_txrx.c
1 /*
2  * Copyright (c) 2010 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         [WME_AC_BE] = ATH_TXQ_AC_BE,
25         [WME_AC_BK] = ATH_TXQ_AC_BK,
26         [WME_AC_VI] = ATH_TXQ_AC_VI,
27         [WME_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[WME_AC_VO];
45         case 1:
46                 return hwq_map[WME_AC_VI];
47         case 2:
48                 return hwq_map[WME_AC_BE];
49         case 3:
50                 return hwq_map[WME_AC_BK];
51         default:
52                 return hwq_map[WME_AC_BE];
53         }
54 }
55
56 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
57                        struct ath9k_tx_queue_info *qinfo)
58 {
59         struct ath_hw *ah = priv->ah;
60         int error = 0;
61         struct ath9k_tx_queue_info qi;
62
63         ath9k_hw_get_txq_props(ah, qnum, &qi);
64
65         qi.tqi_aifs = qinfo->tqi_aifs;
66         qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
67         qi.tqi_cwmax = qinfo->tqi_cwmax;
68         qi.tqi_burstTime = qinfo->tqi_burstTime;
69         qi.tqi_readyTime = qinfo->tqi_readyTime;
70
71         if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
72                 ath_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
73                           "Unable to update hardware queue %u!\n", qnum);
74                 error = -EIO;
75         } else {
76                 ath9k_hw_resettxqueue(ah, qnum);
77         }
78
79         return error;
80 }
81
82 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv, struct sk_buff *skb)
83 {
84         struct ieee80211_hdr *hdr;
85         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
86         struct ieee80211_sta *sta = tx_info->control.sta;
87         struct ath9k_htc_sta *ista;
88         struct ath9k_htc_tx_ctl tx_ctl;
89         enum htc_endpoint_id epid;
90         u16 qnum;
91         __le16 fc;
92         u8 *tx_fhdr;
93         u8 sta_idx, vif_idx;
94
95         hdr = (struct ieee80211_hdr *) skb->data;
96         fc = hdr->frame_control;
97
98         if (tx_info->control.vif &&
99                         (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv)
100                 vif_idx = ((struct ath9k_htc_vif *)
101                                 tx_info->control.vif->drv_priv)->index;
102         else
103                 vif_idx = priv->nvifs;
104
105         if (sta) {
106                 ista = (struct ath9k_htc_sta *) sta->drv_priv;
107                 sta_idx = ista->index;
108         } else {
109                 sta_idx = 0;
110         }
111
112         memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
113
114         if (ieee80211_is_data(fc)) {
115                 struct tx_frame_hdr tx_hdr;
116                 u8 *qc;
117
118                 memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
119
120                 tx_hdr.node_idx = sta_idx;
121                 tx_hdr.vif_idx = vif_idx;
122
123                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
124                         tx_ctl.type = ATH9K_HTC_AMPDU;
125                         tx_hdr.data_type = ATH9K_HTC_AMPDU;
126                 } else {
127                         tx_ctl.type = ATH9K_HTC_NORMAL;
128                         tx_hdr.data_type = ATH9K_HTC_NORMAL;
129                 }
130
131                 if (ieee80211_is_data_qos(fc)) {
132                         qc = ieee80211_get_qos_ctl(hdr);
133                         tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
134                 }
135
136                 /* Check for RTS protection */
137                 if (priv->hw->wiphy->rts_threshold != (u32) -1)
138                         if (skb->len > priv->hw->wiphy->rts_threshold)
139                                 tx_hdr.flags |= ATH9K_HTC_TX_RTSCTS;
140
141                 /* CTS-to-self */
142                 if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
143                     (priv->op_flags & OP_PROTECT_ENABLE))
144                         tx_hdr.flags |= ATH9K_HTC_TX_CTSONLY;
145
146                 tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
147                 if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
148                         tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
149                 else
150                         tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
151
152                 tx_fhdr = skb_push(skb, sizeof(tx_hdr));
153                 memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
154
155                 qnum = skb_get_queue_mapping(skb);
156
157                 switch (qnum) {
158                 case 0:
159                         TX_QSTAT_INC(WME_AC_VO);
160                         epid = priv->data_vo_ep;
161                         break;
162                 case 1:
163                         TX_QSTAT_INC(WME_AC_VI);
164                         epid = priv->data_vi_ep;
165                         break;
166                 case 2:
167                         TX_QSTAT_INC(WME_AC_BE);
168                         epid = priv->data_be_ep;
169                         break;
170                 case 3:
171                 default:
172                         TX_QSTAT_INC(WME_AC_BK);
173                         epid = priv->data_bk_ep;
174                         break;
175                 }
176         } else {
177                 struct tx_mgmt_hdr mgmt_hdr;
178
179                 memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
180
181                 tx_ctl.type = ATH9K_HTC_NORMAL;
182
183                 mgmt_hdr.node_idx = sta_idx;
184                 mgmt_hdr.vif_idx = vif_idx;
185                 mgmt_hdr.tidno = 0;
186                 mgmt_hdr.flags = 0;
187
188                 mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
189                 if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
190                         mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
191                 else
192                         mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
193
194                 tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
195                 memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
196                 epid = priv->mgmt_ep;
197         }
198
199         return htc_send(priv->htc, skb, epid, &tx_ctl);
200 }
201
202 static bool ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
203                                     struct ath9k_htc_sta *ista, u8 tid)
204 {
205         bool ret = false;
206
207         spin_lock_bh(&priv->tx_lock);
208         if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
209                 ret = true;
210         spin_unlock_bh(&priv->tx_lock);
211
212         return ret;
213 }
214
215 void ath9k_tx_tasklet(unsigned long data)
216 {
217         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
218         struct ieee80211_sta *sta;
219         struct ieee80211_hdr *hdr;
220         struct ieee80211_tx_info *tx_info;
221         struct sk_buff *skb = NULL;
222         __le16 fc;
223
224         while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {
225
226                 hdr = (struct ieee80211_hdr *) skb->data;
227                 fc = hdr->frame_control;
228                 tx_info = IEEE80211_SKB_CB(skb);
229
230                 memset(&tx_info->status, 0, sizeof(tx_info->status));
231
232                 rcu_read_lock();
233
234                 sta = ieee80211_find_sta(priv->vif, hdr->addr1);
235                 if (!sta) {
236                         rcu_read_unlock();
237                         ieee80211_tx_status(priv->hw, skb);
238                         continue;
239                 }
240
241                 /* Check if we need to start aggregation */
242
243                 if (sta && conf_is_ht(&priv->hw->conf) &&
244                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
245                         if (ieee80211_is_data_qos(fc)) {
246                                 u8 *qc, tid;
247                                 struct ath9k_htc_sta *ista;
248
249                                 qc = ieee80211_get_qos_ctl(hdr);
250                                 tid = qc[0] & 0xf;
251                                 ista = (struct ath9k_htc_sta *)sta->drv_priv;
252
253                                 if (ath9k_htc_check_tx_aggr(priv, ista, tid)) {
254                                         ieee80211_start_tx_ba_session(sta, tid);
255                                         spin_lock_bh(&priv->tx_lock);
256                                         ista->tid_state[tid] = AGGR_PROGRESS;
257                                         spin_unlock_bh(&priv->tx_lock);
258                                 }
259                         }
260                 }
261
262                 rcu_read_unlock();
263
264                 /* Send status to mac80211 */
265                 ieee80211_tx_status(priv->hw, skb);
266         }
267
268         /* Wake TX queues if needed */
269         spin_lock_bh(&priv->tx_lock);
270         if (priv->tx_queues_stop) {
271                 priv->tx_queues_stop = false;
272                 spin_unlock_bh(&priv->tx_lock);
273                 ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
274                           "Waking up TX queues\n");
275                 ieee80211_wake_queues(priv->hw);
276                 return;
277         }
278         spin_unlock_bh(&priv->tx_lock);
279 }
280
281 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
282                     enum htc_endpoint_id ep_id, bool txok)
283 {
284         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
285         struct ath_common *common = ath9k_hw_common(priv->ah);
286         struct ieee80211_tx_info *tx_info;
287
288         if (!skb)
289                 return;
290
291         if (ep_id == priv->mgmt_ep) {
292                 skb_pull(skb, sizeof(struct tx_mgmt_hdr));
293         } else if ((ep_id == priv->data_bk_ep) ||
294                    (ep_id == priv->data_be_ep) ||
295                    (ep_id == priv->data_vi_ep) ||
296                    (ep_id == priv->data_vo_ep)) {
297                 skb_pull(skb, sizeof(struct tx_frame_hdr));
298         } else {
299                 ath_print(common, ATH_DBG_FATAL,
300                           "Unsupported TX EPID: %d\n", ep_id);
301                 dev_kfree_skb_any(skb);
302                 return;
303         }
304
305         tx_info = IEEE80211_SKB_CB(skb);
306
307         if (txok)
308                 tx_info->flags |= IEEE80211_TX_STAT_ACK;
309
310         skb_queue_tail(&priv->tx_queue, skb);
311         tasklet_schedule(&priv->tx_tasklet);
312 }
313
314 int ath9k_tx_init(struct ath9k_htc_priv *priv)
315 {
316         skb_queue_head_init(&priv->tx_queue);
317         return 0;
318 }
319
320 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
321 {
322
323 }
324
325 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
326 {
327         struct ath_hw *ah = priv->ah;
328         struct ath_common *common = ath9k_hw_common(ah);
329         struct ath9k_tx_queue_info qi;
330         int qnum;
331
332         memset(&qi, 0, sizeof(qi));
333         ATH9K_HTC_INIT_TXQ(subtype);
334
335         qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
336         if (qnum == -1)
337                 return false;
338
339         if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
340                 ath_print(common, ATH_DBG_FATAL,
341                           "qnum %u out of range, max %u!\n",
342                           qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
343                 ath9k_hw_releasetxqueue(ah, qnum);
344                 return false;
345         }
346
347         priv->hwq_map[subtype] = qnum;
348         return true;
349 }
350
351 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
352 {
353         struct ath9k_tx_queue_info qi;
354
355         memset(&qi, 0, sizeof(qi));
356         ATH9K_HTC_INIT_TXQ(0);
357
358         return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
359 }
360
361 /******/
362 /* RX */
363 /******/
364
365 /*
366  * Calculate the RX filter to be set in the HW.
367  */
368 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
369 {
370 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
371
372         struct ath_hw *ah = priv->ah;
373         u32 rfilt;
374
375         rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
376                 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
377                 | ATH9K_RX_FILTER_MCAST;
378
379         if (priv->rxfilter & FIF_PROBE_REQ)
380                 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
381
382         /*
383          * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
384          * mode interface or when in monitor mode. AP mode does not need this
385          * since it receives all in-BSS frames anyway.
386          */
387         if (((ah->opmode != NL80211_IFTYPE_AP) &&
388              (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
389             (ah->opmode == NL80211_IFTYPE_MONITOR))
390                 rfilt |= ATH9K_RX_FILTER_PROM;
391
392         if (priv->rxfilter & FIF_CONTROL)
393                 rfilt |= ATH9K_RX_FILTER_CONTROL;
394
395         if ((ah->opmode == NL80211_IFTYPE_STATION) &&
396             !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
397                 rfilt |= ATH9K_RX_FILTER_MYBEACON;
398         else
399                 rfilt |= ATH9K_RX_FILTER_BEACON;
400
401         if (conf_is_ht(&priv->hw->conf))
402                 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
403
404         return rfilt;
405
406 #undef RX_FILTER_PRESERVE
407 }
408
409 /*
410  * Recv initialization for opmode change.
411  */
412 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
413 {
414         struct ath_hw *ah = priv->ah;
415         struct ath_common *common = ath9k_hw_common(ah);
416
417         u32 rfilt, mfilt[2];
418
419         /* configure rx filter */
420         rfilt = ath9k_htc_calcrxfilter(priv);
421         ath9k_hw_setrxfilter(ah, rfilt);
422
423         /* configure bssid mask */
424         ath_hw_setbssidmask(common);
425
426         /* configure operational mode */
427         ath9k_hw_setopmode(ah);
428
429         /* calculate and install multicast filter */
430         mfilt[0] = mfilt[1] = ~0;
431         ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
432 }
433
434 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
435 {
436         ath9k_hw_rxena(priv->ah);
437         ath9k_htc_opmode_init(priv);
438         ath9k_hw_startpcureceive(priv->ah, (priv->op_flags & OP_SCANNING));
439         priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
440 }
441
442 static void ath9k_process_rate(struct ieee80211_hw *hw,
443                                struct ieee80211_rx_status *rxs,
444                                u8 rx_rate, u8 rs_flags)
445 {
446         struct ieee80211_supported_band *sband;
447         enum ieee80211_band band;
448         unsigned int i = 0;
449
450         if (rx_rate & 0x80) {
451                 /* HT rate */
452                 rxs->flag |= RX_FLAG_HT;
453                 if (rs_flags & ATH9K_RX_2040)
454                         rxs->flag |= RX_FLAG_40MHZ;
455                 if (rs_flags & ATH9K_RX_GI)
456                         rxs->flag |= RX_FLAG_SHORT_GI;
457                 rxs->rate_idx = rx_rate & 0x7f;
458                 return;
459         }
460
461         band = hw->conf.channel->band;
462         sband = hw->wiphy->bands[band];
463
464         for (i = 0; i < sband->n_bitrates; i++) {
465                 if (sband->bitrates[i].hw_value == rx_rate) {
466                         rxs->rate_idx = i;
467                         return;
468                 }
469                 if (sband->bitrates[i].hw_value_short == rx_rate) {
470                         rxs->rate_idx = i;
471                         rxs->flag |= RX_FLAG_SHORTPRE;
472                         return;
473                 }
474         }
475
476 }
477
478 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
479                              struct ath9k_htc_rxbuf *rxbuf,
480                              struct ieee80211_rx_status *rx_status)
481
482 {
483         struct ieee80211_hdr *hdr;
484         struct ieee80211_hw *hw = priv->hw;
485         struct sk_buff *skb = rxbuf->skb;
486         struct ath_common *common = ath9k_hw_common(priv->ah);
487         struct ath_htc_rx_status *rxstatus;
488         int hdrlen, padpos, padsize;
489         int last_rssi = ATH_RSSI_DUMMY_MARKER;
490         __le16 fc;
491
492         if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
493                 ath_print(common, ATH_DBG_FATAL,
494                           "Corrupted RX frame, dropping\n");
495                 goto rx_next;
496         }
497
498         rxstatus = (struct ath_htc_rx_status *)skb->data;
499
500         if (be16_to_cpu(rxstatus->rs_datalen) -
501             (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
502                 ath_print(common, ATH_DBG_FATAL,
503                           "Corrupted RX data len, dropping "
504                           "(dlen: %d, skblen: %d)\n",
505                           rxstatus->rs_datalen, skb->len);
506                 goto rx_next;
507         }
508
509         /* Get the RX status information */
510         memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
511         skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
512
513         hdr = (struct ieee80211_hdr *)skb->data;
514         fc = hdr->frame_control;
515         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
516
517         padpos = ath9k_cmn_padpos(fc);
518
519         padsize = padpos & 3;
520         if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
521                 memmove(skb->data + padsize, skb->data, padpos);
522                 skb_pull(skb, padsize);
523         }
524
525         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
526
527         if (rxbuf->rxstatus.rs_status != 0) {
528                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
529                         rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
530                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
531                         goto rx_next;
532
533                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
534                         /* FIXME */
535                 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
536                         if (ieee80211_is_ctl(fc))
537                                 /*
538                                  * Sometimes, we get invalid
539                                  * MIC failures on valid control frames.
540                                  * Remove these mic errors.
541                                  */
542                                 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
543                         else
544                                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
545                 }
546
547                 /*
548                  * Reject error frames with the exception of
549                  * decryption and MIC failures. For monitor mode,
550                  * we also ignore the CRC error.
551                  */
552                 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
553                         if (rxbuf->rxstatus.rs_status &
554                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
555                               ATH9K_RXERR_CRC))
556                                 goto rx_next;
557                 } else {
558                         if (rxbuf->rxstatus.rs_status &
559                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
560                                 goto rx_next;
561                         }
562                 }
563         }
564
565         if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
566                 u8 keyix;
567                 keyix = rxbuf->rxstatus.rs_keyix;
568                 if (keyix != ATH9K_RXKEYIX_INVALID) {
569                         rx_status->flag |= RX_FLAG_DECRYPTED;
570                 } else if (ieee80211_has_protected(fc) &&
571                            skb->len >= hdrlen + 4) {
572                         keyix = skb->data[hdrlen + 3] >> 6;
573                         if (test_bit(keyix, common->keymap))
574                                 rx_status->flag |= RX_FLAG_DECRYPTED;
575                 }
576         }
577
578         ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
579                            rxbuf->rxstatus.rs_flags);
580
581         if (priv->op_flags & OP_ASSOCIATED) {
582                 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
583                     !rxbuf->rxstatus.rs_moreaggr)
584                         ATH_RSSI_LPF(priv->rx.last_rssi,
585                                      rxbuf->rxstatus.rs_rssi);
586
587                 last_rssi = priv->rx.last_rssi;
588
589                 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
590                         rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
591                                                              ATH_RSSI_EP_MULTIPLIER);
592
593                 if (rxbuf->rxstatus.rs_rssi < 0)
594                         rxbuf->rxstatus.rs_rssi = 0;
595
596                 if (ieee80211_is_beacon(fc))
597                         priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
598         }
599
600         rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
601         rx_status->band = hw->conf.channel->band;
602         rx_status->freq = hw->conf.channel->center_freq;
603         rx_status->signal =  rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
604         rx_status->antenna = rxbuf->rxstatus.rs_antenna;
605         rx_status->flag |= RX_FLAG_TSFT;
606
607         return true;
608
609 rx_next:
610         return false;
611 }
612
613 /*
614  * FIXME: Handle FLUSH later on.
615  */
616 void ath9k_rx_tasklet(unsigned long data)
617 {
618         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
619         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
620         struct ieee80211_rx_status rx_status;
621         struct sk_buff *skb;
622         unsigned long flags;
623         struct ieee80211_hdr *hdr;
624
625         do {
626                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
627                 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
628                         if (tmp_buf->in_process) {
629                                 rxbuf = tmp_buf;
630                                 break;
631                         }
632                 }
633
634                 if (rxbuf == NULL) {
635                         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
636                         break;
637                 }
638
639                 if (!rxbuf->skb)
640                         goto requeue;
641
642                 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
643                         dev_kfree_skb_any(rxbuf->skb);
644                         goto requeue;
645                 }
646
647                 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
648                        sizeof(struct ieee80211_rx_status));
649                 skb = rxbuf->skb;
650                 hdr = (struct ieee80211_hdr *) skb->data;
651
652                 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
653                                 ieee80211_queue_work(priv->hw, &priv->ps_work);
654
655                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
656
657                 ieee80211_rx(priv->hw, skb);
658
659                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
660 requeue:
661                 rxbuf->in_process = false;
662                 rxbuf->skb = NULL;
663                 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
664                 rxbuf = NULL;
665                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
666         } while (1);
667
668 }
669
670 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
671                     enum htc_endpoint_id ep_id)
672 {
673         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
674         struct ath_hw *ah = priv->ah;
675         struct ath_common *common = ath9k_hw_common(ah);
676         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
677
678         spin_lock(&priv->rx.rxbuflock);
679         list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
680                 if (!tmp_buf->in_process) {
681                         rxbuf = tmp_buf;
682                         break;
683                 }
684         }
685         spin_unlock(&priv->rx.rxbuflock);
686
687         if (rxbuf == NULL) {
688                 ath_print(common, ATH_DBG_ANY,
689                           "No free RX buffer\n");
690                 goto err;
691         }
692
693         spin_lock(&priv->rx.rxbuflock);
694         rxbuf->skb = skb;
695         rxbuf->in_process = true;
696         spin_unlock(&priv->rx.rxbuflock);
697
698         tasklet_schedule(&priv->rx_tasklet);
699         return;
700 err:
701         dev_kfree_skb_any(skb);
702 }
703
704 /* FIXME: Locking for cleanup/init */
705
706 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
707 {
708         struct ath9k_htc_rxbuf *rxbuf, *tbuf;
709
710         list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
711                 list_del(&rxbuf->list);
712                 if (rxbuf->skb)
713                         dev_kfree_skb_any(rxbuf->skb);
714                 kfree(rxbuf);
715         }
716 }
717
718 int ath9k_rx_init(struct ath9k_htc_priv *priv)
719 {
720         struct ath_hw *ah = priv->ah;
721         struct ath_common *common = ath9k_hw_common(ah);
722         struct ath9k_htc_rxbuf *rxbuf;
723         int i = 0;
724
725         INIT_LIST_HEAD(&priv->rx.rxbuf);
726         spin_lock_init(&priv->rx.rxbuflock);
727
728         for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
729                 rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
730                 if (rxbuf == NULL) {
731                         ath_print(common, ATH_DBG_FATAL,
732                                   "Unable to allocate RX buffers\n");
733                         goto err;
734                 }
735                 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
736         }
737
738         return 0;
739
740 err:
741         ath9k_rx_cleanup(priv);
742         return -ENOMEM;
743 }