wireless: b43: fix error path in SDIO
[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 #define ATH9K_HTC_INIT_TXQ(subtype) do {                        \
24                 qi.tqi_subtype = subtype;                       \
25                 qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;             \
26                 qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;            \
27                 qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;            \
28                 qi.tqi_physCompBuf = 0;                         \
29                 qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |      \
30                         TXQ_FLAG_TXDESCINT_ENABLE;              \
31         } while (0)
32
33 int get_hw_qnum(u16 queue, int *hwq_map)
34 {
35         switch (queue) {
36         case 0:
37                 return hwq_map[WME_AC_VO];
38         case 1:
39                 return hwq_map[WME_AC_VI];
40         case 2:
41                 return hwq_map[WME_AC_BE];
42         case 3:
43                 return hwq_map[WME_AC_BK];
44         default:
45                 return hwq_map[WME_AC_BE];
46         }
47 }
48
49 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
50                        struct ath9k_tx_queue_info *qinfo)
51 {
52         struct ath_hw *ah = priv->ah;
53         int error = 0;
54         struct ath9k_tx_queue_info qi;
55
56         ath9k_hw_get_txq_props(ah, qnum, &qi);
57
58         qi.tqi_aifs = qinfo->tqi_aifs;
59         qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
60         qi.tqi_cwmax = qinfo->tqi_cwmax;
61         qi.tqi_burstTime = qinfo->tqi_burstTime;
62         qi.tqi_readyTime = qinfo->tqi_readyTime;
63
64         if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
65                 ath_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
66                           "Unable to update hardware queue %u!\n", qnum);
67                 error = -EIO;
68         } else {
69                 ath9k_hw_resettxqueue(ah, qnum);
70         }
71
72         return error;
73 }
74
75 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv, struct sk_buff *skb)
76 {
77         struct ieee80211_hdr *hdr;
78         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
79         struct ieee80211_sta *sta = tx_info->control.sta;
80         struct ath9k_htc_sta *ista;
81         struct ath9k_htc_tx_ctl tx_ctl;
82         enum htc_endpoint_id epid;
83         u16 qnum;
84         __le16 fc;
85         u8 *tx_fhdr;
86         u8 sta_idx, vif_idx;
87
88         hdr = (struct ieee80211_hdr *) skb->data;
89         fc = hdr->frame_control;
90
91         if (tx_info->control.vif &&
92                         (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv)
93                 vif_idx = ((struct ath9k_htc_vif *)
94                                 tx_info->control.vif->drv_priv)->index;
95         else
96                 vif_idx = priv->nvifs;
97
98         if (sta) {
99                 ista = (struct ath9k_htc_sta *) sta->drv_priv;
100                 sta_idx = ista->index;
101         } else {
102                 sta_idx = 0;
103         }
104
105         memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
106
107         if (ieee80211_is_data(fc)) {
108                 struct tx_frame_hdr tx_hdr;
109                 u8 *qc;
110
111                 memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
112
113                 tx_hdr.node_idx = sta_idx;
114                 tx_hdr.vif_idx = vif_idx;
115
116                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
117                         tx_ctl.type = ATH9K_HTC_AMPDU;
118                         tx_hdr.data_type = ATH9K_HTC_AMPDU;
119                 } else {
120                         tx_ctl.type = ATH9K_HTC_NORMAL;
121                         tx_hdr.data_type = ATH9K_HTC_NORMAL;
122                 }
123
124                 if (ieee80211_is_data_qos(fc)) {
125                         qc = ieee80211_get_qos_ctl(hdr);
126                         tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
127                 }
128
129                 /* Check for RTS protection */
130                 if (priv->hw->wiphy->rts_threshold != (u32) -1)
131                         if (skb->len > priv->hw->wiphy->rts_threshold)
132                                 tx_hdr.flags |= ATH9K_HTC_TX_RTSCTS;
133
134                 /* CTS-to-self */
135                 if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
136                     (priv->op_flags & OP_PROTECT_ENABLE))
137                         tx_hdr.flags |= ATH9K_HTC_TX_CTSONLY;
138
139                 tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
140                 if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
141                         tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
142                 else
143                         tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
144
145                 tx_fhdr = skb_push(skb, sizeof(tx_hdr));
146                 memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
147
148                 qnum = skb_get_queue_mapping(skb);
149
150                 switch (qnum) {
151                 case 0:
152                         TX_QSTAT_INC(WME_AC_VO);
153                         epid = priv->data_vo_ep;
154                         break;
155                 case 1:
156                         TX_QSTAT_INC(WME_AC_VI);
157                         epid = priv->data_vi_ep;
158                         break;
159                 case 2:
160                         TX_QSTAT_INC(WME_AC_BE);
161                         epid = priv->data_be_ep;
162                         break;
163                 case 3:
164                 default:
165                         TX_QSTAT_INC(WME_AC_BK);
166                         epid = priv->data_bk_ep;
167                         break;
168                 }
169         } else {
170                 struct tx_mgmt_hdr mgmt_hdr;
171
172                 memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
173
174                 tx_ctl.type = ATH9K_HTC_NORMAL;
175
176                 mgmt_hdr.node_idx = sta_idx;
177                 mgmt_hdr.vif_idx = vif_idx;
178                 mgmt_hdr.tidno = 0;
179                 mgmt_hdr.flags = 0;
180
181                 mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
182                 if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
183                         mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
184                 else
185                         mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
186
187                 tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
188                 memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
189                 epid = priv->mgmt_ep;
190         }
191
192         return htc_send(priv->htc, skb, epid, &tx_ctl);
193 }
194
195 static bool ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
196                                     struct ath9k_htc_sta *ista, u8 tid)
197 {
198         bool ret = false;
199
200         spin_lock_bh(&priv->tx_lock);
201         if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
202                 ret = true;
203         spin_unlock_bh(&priv->tx_lock);
204
205         return ret;
206 }
207
208 void ath9k_tx_tasklet(unsigned long data)
209 {
210         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
211         struct ieee80211_sta *sta;
212         struct ieee80211_hdr *hdr;
213         struct ieee80211_tx_info *tx_info;
214         struct sk_buff *skb = NULL;
215         __le16 fc;
216
217         while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {
218
219                 hdr = (struct ieee80211_hdr *) skb->data;
220                 fc = hdr->frame_control;
221                 tx_info = IEEE80211_SKB_CB(skb);
222
223                 memset(&tx_info->status, 0, sizeof(tx_info->status));
224
225                 rcu_read_lock();
226
227                 sta = ieee80211_find_sta(priv->vif, hdr->addr1);
228                 if (!sta) {
229                         rcu_read_unlock();
230                         ieee80211_tx_status(priv->hw, skb);
231                         continue;
232                 }
233
234                 /* Check if we need to start aggregation */
235
236                 if (sta && conf_is_ht(&priv->hw->conf) &&
237                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
238                         if (ieee80211_is_data_qos(fc)) {
239                                 u8 *qc, tid;
240                                 struct ath9k_htc_sta *ista;
241
242                                 qc = ieee80211_get_qos_ctl(hdr);
243                                 tid = qc[0] & 0xf;
244                                 ista = (struct ath9k_htc_sta *)sta->drv_priv;
245
246                                 if (ath9k_htc_check_tx_aggr(priv, ista, tid)) {
247                                         ieee80211_start_tx_ba_session(sta, tid);
248                                         spin_lock_bh(&priv->tx_lock);
249                                         ista->tid_state[tid] = AGGR_PROGRESS;
250                                         spin_unlock_bh(&priv->tx_lock);
251                                 }
252                         }
253                 }
254
255                 rcu_read_unlock();
256
257                 /* Send status to mac80211 */
258                 ieee80211_tx_status(priv->hw, skb);
259         }
260
261         /* Wake TX queues if needed */
262         spin_lock_bh(&priv->tx_lock);
263         if (priv->tx_queues_stop) {
264                 priv->tx_queues_stop = false;
265                 spin_unlock_bh(&priv->tx_lock);
266                 ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
267                           "Waking up TX queues\n");
268                 ieee80211_wake_queues(priv->hw);
269                 return;
270         }
271         spin_unlock_bh(&priv->tx_lock);
272 }
273
274 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
275                     enum htc_endpoint_id ep_id, bool txok)
276 {
277         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
278         struct ath_common *common = ath9k_hw_common(priv->ah);
279         struct ieee80211_tx_info *tx_info;
280
281         if (!skb)
282                 return;
283
284         if (ep_id == priv->mgmt_ep) {
285                 skb_pull(skb, sizeof(struct tx_mgmt_hdr));
286         } else if ((ep_id == priv->data_bk_ep) ||
287                    (ep_id == priv->data_be_ep) ||
288                    (ep_id == priv->data_vi_ep) ||
289                    (ep_id == priv->data_vo_ep)) {
290                 skb_pull(skb, sizeof(struct tx_frame_hdr));
291         } else {
292                 ath_print(common, ATH_DBG_FATAL,
293                           "Unsupported TX EPID: %d\n", ep_id);
294                 dev_kfree_skb_any(skb);
295                 return;
296         }
297
298         tx_info = IEEE80211_SKB_CB(skb);
299
300         if (txok)
301                 tx_info->flags |= IEEE80211_TX_STAT_ACK;
302
303         skb_queue_tail(&priv->tx_queue, skb);
304         tasklet_schedule(&priv->tx_tasklet);
305 }
306
307 int ath9k_tx_init(struct ath9k_htc_priv *priv)
308 {
309         skb_queue_head_init(&priv->tx_queue);
310         return 0;
311 }
312
313 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
314 {
315
316 }
317
318 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
319 {
320         struct ath_hw *ah = priv->ah;
321         struct ath_common *common = ath9k_hw_common(ah);
322         struct ath9k_tx_queue_info qi;
323         int qnum;
324
325         memset(&qi, 0, sizeof(qi));
326         ATH9K_HTC_INIT_TXQ(subtype);
327
328         qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
329         if (qnum == -1)
330                 return false;
331
332         if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
333                 ath_print(common, ATH_DBG_FATAL,
334                           "qnum %u out of range, max %u!\n",
335                           qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
336                 ath9k_hw_releasetxqueue(ah, qnum);
337                 return false;
338         }
339
340         priv->hwq_map[subtype] = qnum;
341         return true;
342 }
343
344 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
345 {
346         struct ath9k_tx_queue_info qi;
347
348         memset(&qi, 0, sizeof(qi));
349         ATH9K_HTC_INIT_TXQ(0);
350
351         return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
352 }
353
354 /******/
355 /* RX */
356 /******/
357
358 /*
359  * Calculate the RX filter to be set in the HW.
360  */
361 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
362 {
363 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
364
365         struct ath_hw *ah = priv->ah;
366         u32 rfilt;
367
368         rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
369                 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
370                 | ATH9K_RX_FILTER_MCAST;
371
372         if (priv->rxfilter & FIF_PROBE_REQ)
373                 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
374
375         /*
376          * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
377          * mode interface or when in monitor mode. AP mode does not need this
378          * since it receives all in-BSS frames anyway.
379          */
380         if (((ah->opmode != NL80211_IFTYPE_AP) &&
381              (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
382             (ah->opmode == NL80211_IFTYPE_MONITOR))
383                 rfilt |= ATH9K_RX_FILTER_PROM;
384
385         if (priv->rxfilter & FIF_CONTROL)
386                 rfilt |= ATH9K_RX_FILTER_CONTROL;
387
388         if ((ah->opmode == NL80211_IFTYPE_STATION) &&
389             !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
390                 rfilt |= ATH9K_RX_FILTER_MYBEACON;
391         else
392                 rfilt |= ATH9K_RX_FILTER_BEACON;
393
394         if (conf_is_ht(&priv->hw->conf))
395                 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
396
397         return rfilt;
398
399 #undef RX_FILTER_PRESERVE
400 }
401
402 /*
403  * Recv initialization for opmode change.
404  */
405 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
406 {
407         struct ath_hw *ah = priv->ah;
408         struct ath_common *common = ath9k_hw_common(ah);
409
410         u32 rfilt, mfilt[2];
411
412         /* configure rx filter */
413         rfilt = ath9k_htc_calcrxfilter(priv);
414         ath9k_hw_setrxfilter(ah, rfilt);
415
416         /* configure bssid mask */
417         ath_hw_setbssidmask(common);
418
419         /* configure operational mode */
420         ath9k_hw_setopmode(ah);
421
422         /* calculate and install multicast filter */
423         mfilt[0] = mfilt[1] = ~0;
424         ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
425 }
426
427 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
428 {
429         ath9k_hw_rxena(priv->ah);
430         ath9k_htc_opmode_init(priv);
431         ath9k_hw_startpcureceive(priv->ah, (priv->op_flags & OP_SCANNING));
432         priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
433 }
434
435 static void ath9k_process_rate(struct ieee80211_hw *hw,
436                                struct ieee80211_rx_status *rxs,
437                                u8 rx_rate, u8 rs_flags)
438 {
439         struct ieee80211_supported_band *sband;
440         enum ieee80211_band band;
441         unsigned int i = 0;
442
443         if (rx_rate & 0x80) {
444                 /* HT rate */
445                 rxs->flag |= RX_FLAG_HT;
446                 if (rs_flags & ATH9K_RX_2040)
447                         rxs->flag |= RX_FLAG_40MHZ;
448                 if (rs_flags & ATH9K_RX_GI)
449                         rxs->flag |= RX_FLAG_SHORT_GI;
450                 rxs->rate_idx = rx_rate & 0x7f;
451                 return;
452         }
453
454         band = hw->conf.channel->band;
455         sband = hw->wiphy->bands[band];
456
457         for (i = 0; i < sband->n_bitrates; i++) {
458                 if (sband->bitrates[i].hw_value == rx_rate) {
459                         rxs->rate_idx = i;
460                         return;
461                 }
462                 if (sband->bitrates[i].hw_value_short == rx_rate) {
463                         rxs->rate_idx = i;
464                         rxs->flag |= RX_FLAG_SHORTPRE;
465                         return;
466                 }
467         }
468
469 }
470
471 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
472                              struct ath9k_htc_rxbuf *rxbuf,
473                              struct ieee80211_rx_status *rx_status)
474
475 {
476         struct ieee80211_hdr *hdr;
477         struct ieee80211_hw *hw = priv->hw;
478         struct sk_buff *skb = rxbuf->skb;
479         struct ath_common *common = ath9k_hw_common(priv->ah);
480         struct ath_htc_rx_status *rxstatus;
481         int hdrlen, padpos, padsize;
482         int last_rssi = ATH_RSSI_DUMMY_MARKER;
483         __le16 fc;
484
485         if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
486                 ath_print(common, ATH_DBG_FATAL,
487                           "Corrupted RX frame, dropping\n");
488                 goto rx_next;
489         }
490
491         rxstatus = (struct ath_htc_rx_status *)skb->data;
492
493         if (be16_to_cpu(rxstatus->rs_datalen) -
494             (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
495                 ath_print(common, ATH_DBG_FATAL,
496                           "Corrupted RX data len, dropping "
497                           "(dlen: %d, skblen: %d)\n",
498                           rxstatus->rs_datalen, skb->len);
499                 goto rx_next;
500         }
501
502         /* Get the RX status information */
503         memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
504         skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
505
506         hdr = (struct ieee80211_hdr *)skb->data;
507         fc = hdr->frame_control;
508         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
509
510         padpos = ath9k_cmn_padpos(fc);
511
512         padsize = padpos & 3;
513         if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
514                 memmove(skb->data + padsize, skb->data, padpos);
515                 skb_pull(skb, padsize);
516         }
517
518         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
519
520         if (rxbuf->rxstatus.rs_status != 0) {
521                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
522                         rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
523                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
524                         goto rx_next;
525
526                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
527                         /* FIXME */
528                 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
529                         if (ieee80211_is_ctl(fc))
530                                 /*
531                                  * Sometimes, we get invalid
532                                  * MIC failures on valid control frames.
533                                  * Remove these mic errors.
534                                  */
535                                 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
536                         else
537                                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
538                 }
539
540                 /*
541                  * Reject error frames with the exception of
542                  * decryption and MIC failures. For monitor mode,
543                  * we also ignore the CRC error.
544                  */
545                 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
546                         if (rxbuf->rxstatus.rs_status &
547                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
548                               ATH9K_RXERR_CRC))
549                                 goto rx_next;
550                 } else {
551                         if (rxbuf->rxstatus.rs_status &
552                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
553                                 goto rx_next;
554                         }
555                 }
556         }
557
558         if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
559                 u8 keyix;
560                 keyix = rxbuf->rxstatus.rs_keyix;
561                 if (keyix != ATH9K_RXKEYIX_INVALID) {
562                         rx_status->flag |= RX_FLAG_DECRYPTED;
563                 } else if (ieee80211_has_protected(fc) &&
564                            skb->len >= hdrlen + 4) {
565                         keyix = skb->data[hdrlen + 3] >> 6;
566                         if (test_bit(keyix, common->keymap))
567                                 rx_status->flag |= RX_FLAG_DECRYPTED;
568                 }
569         }
570
571         ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
572                            rxbuf->rxstatus.rs_flags);
573
574         if (priv->op_flags & OP_ASSOCIATED) {
575                 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
576                     !rxbuf->rxstatus.rs_moreaggr)
577                         ATH_RSSI_LPF(priv->rx.last_rssi,
578                                      rxbuf->rxstatus.rs_rssi);
579
580                 last_rssi = priv->rx.last_rssi;
581
582                 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
583                         rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
584                                                              ATH_RSSI_EP_MULTIPLIER);
585
586                 if (rxbuf->rxstatus.rs_rssi < 0)
587                         rxbuf->rxstatus.rs_rssi = 0;
588
589                 if (ieee80211_is_beacon(fc))
590                         priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
591         }
592
593         rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
594         rx_status->band = hw->conf.channel->band;
595         rx_status->freq = hw->conf.channel->center_freq;
596         rx_status->signal =  rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
597         rx_status->antenna = rxbuf->rxstatus.rs_antenna;
598         rx_status->flag |= RX_FLAG_TSFT;
599
600         return true;
601
602 rx_next:
603         return false;
604 }
605
606 /*
607  * FIXME: Handle FLUSH later on.
608  */
609 void ath9k_rx_tasklet(unsigned long data)
610 {
611         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
612         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
613         struct ieee80211_rx_status rx_status;
614         struct sk_buff *skb;
615         unsigned long flags;
616         struct ieee80211_hdr *hdr;
617
618         do {
619                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
620                 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
621                         if (tmp_buf->in_process) {
622                                 rxbuf = tmp_buf;
623                                 break;
624                         }
625                 }
626
627                 if (rxbuf == NULL) {
628                         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
629                         break;
630                 }
631
632                 if (!rxbuf->skb)
633                         goto requeue;
634
635                 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
636                         dev_kfree_skb_any(rxbuf->skb);
637                         goto requeue;
638                 }
639
640                 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
641                        sizeof(struct ieee80211_rx_status));
642                 skb = rxbuf->skb;
643                 hdr = (struct ieee80211_hdr *) skb->data;
644
645                 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
646                                 ieee80211_queue_work(priv->hw, &priv->ps_work);
647
648                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
649
650                 ieee80211_rx(priv->hw, skb);
651
652                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
653 requeue:
654                 rxbuf->in_process = false;
655                 rxbuf->skb = NULL;
656                 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
657                 rxbuf = NULL;
658                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
659         } while (1);
660
661 }
662
663 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
664                     enum htc_endpoint_id ep_id)
665 {
666         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
667         struct ath_hw *ah = priv->ah;
668         struct ath_common *common = ath9k_hw_common(ah);
669         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
670
671         spin_lock(&priv->rx.rxbuflock);
672         list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
673                 if (!tmp_buf->in_process) {
674                         rxbuf = tmp_buf;
675                         break;
676                 }
677         }
678         spin_unlock(&priv->rx.rxbuflock);
679
680         if (rxbuf == NULL) {
681                 ath_print(common, ATH_DBG_ANY,
682                           "No free RX buffer\n");
683                 goto err;
684         }
685
686         spin_lock(&priv->rx.rxbuflock);
687         rxbuf->skb = skb;
688         rxbuf->in_process = true;
689         spin_unlock(&priv->rx.rxbuflock);
690
691         tasklet_schedule(&priv->rx_tasklet);
692         return;
693 err:
694         dev_kfree_skb_any(skb);
695 }
696
697 /* FIXME: Locking for cleanup/init */
698
699 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
700 {
701         struct ath9k_htc_rxbuf *rxbuf, *tbuf;
702
703         list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
704                 list_del(&rxbuf->list);
705                 if (rxbuf->skb)
706                         dev_kfree_skb_any(rxbuf->skb);
707                 kfree(rxbuf);
708         }
709 }
710
711 int ath9k_rx_init(struct ath9k_htc_priv *priv)
712 {
713         struct ath_hw *ah = priv->ah;
714         struct ath_common *common = ath9k_hw_common(ah);
715         struct ath9k_htc_rxbuf *rxbuf;
716         int i = 0;
717
718         INIT_LIST_HEAD(&priv->rx.rxbuf);
719         spin_lock_init(&priv->rx.rxbuflock);
720
721         for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
722                 rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
723                 if (rxbuf == NULL) {
724                         ath_print(common, ATH_DBG_FATAL,
725                                   "Unable to allocate RX buffers\n");
726                         goto err;
727                 }
728                 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
729         }
730
731         return 0;
732
733 err:
734         ath9k_rx_cleanup(priv);
735         return -ENOMEM;
736 }