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(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 not a STA, enable processing of Probe Requests */
 373         if (ah->opmode != NL80211_IFTYPE_STATION)
 374                 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
 375
 376         /*
 377          * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
 378          * mode interface or when in monitor mode. AP mode does not need this
 379          * since it receives all in-BSS frames anyway.
 380          */
 381         if (((ah->opmode != NL80211_IFTYPE_AP) &&
 382              (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
 383             (ah->opmode == NL80211_IFTYPE_MONITOR))
 384                 rfilt |= ATH9K_RX_FILTER_PROM;
 385
 386         if (priv->rxfilter & FIF_CONTROL)
 387                 rfilt |= ATH9K_RX_FILTER_CONTROL;
 388
 389         if ((ah->opmode == NL80211_IFTYPE_STATION) &&
 390             !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
 391                 rfilt |= ATH9K_RX_FILTER_MYBEACON;
 392         else
 393                 rfilt |= ATH9K_RX_FILTER_BEACON;
 394
 395         if (conf_is_ht(&priv->hw->conf))
 396                 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
 397
 398         return rfilt;
 399
 400 #undef RX_FILTER_PRESERVE
 401 }
 402
 403 /*
 404  * Recv initialization for opmode change.
 405  */
 406 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
 407 {
 408         struct ath_hw *ah = priv->ah;
 409         struct ath_common *common = ath9k_hw_common(ah);
 410
 411         u32 rfilt, mfilt[2];
 412
 413         /* configure rx filter */
 414         rfilt = ath9k_htc_calcrxfilter(priv);
 415         ath9k_hw_setrxfilter(ah, rfilt);
 416
 417         /* configure bssid mask */
 418         ath_hw_setbssidmask(common);
 419
 420         /* configure operational mode */
 421         ath9k_hw_setopmode(ah);
 422
 423         /* calculate and install multicast filter */
 424         mfilt[0] = mfilt[1] = ~0;
 425         ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
 426 }
 427
 428 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
 429 {
 430         ath9k_hw_rxena(priv->ah);
 431         ath9k_htc_opmode_init(priv);
 432         ath9k_hw_startpcureceive(priv->ah, (priv->op_flags & OP_SCANNING));
 433         priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
 434 }
 435
 436 static void ath9k_process_rate(struct ieee80211_hw *hw,
 437                                struct ieee80211_rx_status *rxs,
 438                                u8 rx_rate, u8 rs_flags)
 439 {
 440         struct ieee80211_supported_band *sband;
 441         enum ieee80211_band band;
 442         unsigned int i = 0;
 443
 444         if (rx_rate & 0x80) {
 445                 /* HT rate */
 446                 rxs->flag |= RX_FLAG_HT;
 447                 if (rs_flags & ATH9K_RX_2040)
 448                         rxs->flag |= RX_FLAG_40MHZ;
 449                 if (rs_flags & ATH9K_RX_GI)
 450                         rxs->flag |= RX_FLAG_SHORT_GI;
 451                 rxs->rate_idx = rx_rate & 0x7f;
 452                 return;
 453         }
 454
 455         band = hw->conf.channel->band;
 456         sband = hw->wiphy->bands[band];
 457
 458         for (i = 0; i < sband->n_bitrates; i++) {
 459                 if (sband->bitrates[i].hw_value == rx_rate) {
 460                         rxs->rate_idx = i;
 461                         return;
 462                 }
 463                 if (sband->bitrates[i].hw_value_short == rx_rate) {
 464                         rxs->rate_idx = i;
 465                         rxs->flag |= RX_FLAG_SHORTPRE;
 466                         return;
 467                 }
 468         }
 469
 470 }
 471
 472 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 473                              struct ath9k_htc_rxbuf *rxbuf,
 474                              struct ieee80211_rx_status *rx_status)
 475
 476 {
 477         struct ieee80211_hdr *hdr;
 478         struct ieee80211_hw *hw = priv->hw;
 479         struct sk_buff *skb = rxbuf->skb;
 480         struct ath_common *common = ath9k_hw_common(priv->ah);
 481         struct ath_htc_rx_status *rxstatus;
 482         int hdrlen, padpos, padsize;
 483         int last_rssi = ATH_RSSI_DUMMY_MARKER;
 484         __le16 fc;
 485
 486         if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
 487                 ath_print(common, ATH_DBG_FATAL,
 488                           "Corrupted RX frame, dropping\n");
 489                 goto rx_next;
 490         }
 491
 492         rxstatus = (struct ath_htc_rx_status *)skb->data;
 493
 494         if (be16_to_cpu(rxstatus->rs_datalen) -
 495             (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
 496                 ath_print(common, ATH_DBG_FATAL,
 497                           "Corrupted RX data len, dropping "
 498                           "(dlen: %d, skblen: %d)\n",
 499                           rxstatus->rs_datalen, skb->len);
 500                 goto rx_next;
 501         }
 502
 503         /* Get the RX status information */
 504         memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
 505         skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
 506
 507         hdr = (struct ieee80211_hdr *)skb->data;
 508         fc = hdr->frame_control;
 509         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 510
 511         padpos = ath9k_cmn_padpos(fc);
 512
 513         padsize = padpos & 3;
 514         if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
 515                 memmove(skb->data + padsize, skb->data, padpos);
 516                 skb_pull(skb, padsize);
 517         }
 518
 519         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
 520
 521         if (rxbuf->rxstatus.rs_status != 0) {
 522                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
 523                         rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 524                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
 525                         goto rx_next;
 526
 527                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
 528                         /* FIXME */
 529                 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
 530                         if (ieee80211_is_ctl(fc))
 531                                 /*
 532                                  * Sometimes, we get invalid
 533                                  * MIC failures on valid control frames.
 534                                  * Remove these mic errors.
 535                                  */
 536                                 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
 537                         else
 538                                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
 539                 }
 540
 541                 /*
 542                  * Reject error frames with the exception of
 543                  * decryption and MIC failures. For monitor mode,
 544                  * we also ignore the CRC error.
 545                  */
 546                 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
 547                         if (rxbuf->rxstatus.rs_status &
 548                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
 549                               ATH9K_RXERR_CRC))
 550                                 goto rx_next;
 551                 } else {
 552                         if (rxbuf->rxstatus.rs_status &
 553                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
 554                                 goto rx_next;
 555                         }
 556                 }
 557         }
 558
 559         if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
 560                 u8 keyix;
 561                 keyix = rxbuf->rxstatus.rs_keyix;
 562                 if (keyix != ATH9K_RXKEYIX_INVALID) {
 563                         rx_status->flag |= RX_FLAG_DECRYPTED;
 564                 } else if (ieee80211_has_protected(fc) &&
 565                            skb->len >= hdrlen + 4) {
 566                         keyix = skb->data[hdrlen + 3] >> 6;
 567                         if (test_bit(keyix, common->keymap))
 568                                 rx_status->flag |= RX_FLAG_DECRYPTED;
 569                 }
 570         }
 571
 572         ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
 573                            rxbuf->rxstatus.rs_flags);
 574
 575         if (priv->op_flags & OP_ASSOCIATED) {
 576                 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
 577                     !rxbuf->rxstatus.rs_moreaggr)
 578                         ATH_RSSI_LPF(priv->rx.last_rssi,
 579                                      rxbuf->rxstatus.rs_rssi);
 580
 581                 last_rssi = priv->rx.last_rssi;
 582
 583                 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
 584                         rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
 585                                                              ATH_RSSI_EP_MULTIPLIER);
 586
 587                 if (rxbuf->rxstatus.rs_rssi < 0)
 588                         rxbuf->rxstatus.rs_rssi = 0;
 589
 590                 if (ieee80211_is_beacon(fc))
 591                         priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
 592         }
 593
 594         rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
 595         rx_status->band = hw->conf.channel->band;
 596         rx_status->freq = hw->conf.channel->center_freq;
 597         rx_status->signal =  rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
 598         rx_status->antenna = rxbuf->rxstatus.rs_antenna;
 599         rx_status->flag |= RX_FLAG_TSFT;
 600
 601         return true;
 602
 603 rx_next:
 604         return false;
 605 }
 606
 607 /*
 608  * FIXME: Handle FLUSH later on.
 609  */
 610 void ath9k_rx_tasklet(unsigned long data)
 611 {
 612         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 613         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
 614         struct ieee80211_rx_status rx_status;
 615         struct sk_buff *skb;
 616         unsigned long flags;
 617         struct ieee80211_hdr *hdr;
 618
 619         do {
 620                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 621                 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 622                         if (tmp_buf->in_process) {
 623                                 rxbuf = tmp_buf;
 624                                 break;
 625                         }
 626                 }
 627
 628                 if (rxbuf == NULL) {
 629                         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 630                         break;
 631                 }
 632
 633                 if (!rxbuf->skb)
 634                         goto requeue;
 635
 636                 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
 637                         dev_kfree_skb_any(rxbuf->skb);
 638                         goto requeue;
 639                 }
 640
 641                 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
 642                        sizeof(struct ieee80211_rx_status));
 643                 skb = rxbuf->skb;
 644                 hdr = (struct ieee80211_hdr *) skb->data;
 645
 646                 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
 647                                 ieee80211_queue_work(priv->hw, &priv->ps_work);
 648
 649                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 650
 651                 ieee80211_rx(priv->hw, skb);
 652
 653                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 654 requeue:
 655                 rxbuf->in_process = false;
 656                 rxbuf->skb = NULL;
 657                 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
 658                 rxbuf = NULL;
 659                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 660         } while (1);
 661
 662 }
 663
 664 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
 665                     enum htc_endpoint_id ep_id)
 666 {
 667         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
 668         struct ath_hw *ah = priv->ah;
 669         struct ath_common *common = ath9k_hw_common(ah);
 670         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
 671
 672         spin_lock(&priv->rx.rxbuflock);
 673         list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 674                 if (!tmp_buf->in_process) {
 675                         rxbuf = tmp_buf;
 676                         break;
 677                 }
 678         }
 679         spin_unlock(&priv->rx.rxbuflock);
 680
 681         if (rxbuf == NULL) {
 682                 ath_print(common, ATH_DBG_ANY,
 683                           "No free RX buffer\n");
 684                 goto err;
 685         }
 686
 687         spin_lock(&priv->rx.rxbuflock);
 688         rxbuf->skb = skb;
 689         rxbuf->in_process = true;
 690         spin_unlock(&priv->rx.rxbuflock);
 691
 692         tasklet_schedule(&priv->rx_tasklet);
 693         return;
 694 err:
 695         dev_kfree_skb_any(skb);
 696 }
 697
 698 /* FIXME: Locking for cleanup/init */
 699
 700 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
 701 {
 702         struct ath9k_htc_rxbuf *rxbuf, *tbuf;
 703
 704         list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
 705                 list_del(&rxbuf->list);
 706                 if (rxbuf->skb)
 707                         dev_kfree_skb_any(rxbuf->skb);
 708                 kfree(rxbuf);
 709         }
 710 }
 711
 712 int ath9k_rx_init(struct ath9k_htc_priv *priv)
 713 {
 714         struct ath_hw *ah = priv->ah;
 715         struct ath_common *common = ath9k_hw_common(ah);
 716         struct ath9k_htc_rxbuf *rxbuf;
 717         int i = 0;
 718
 719         INIT_LIST_HEAD(&priv->rx.rxbuf);
 720         spin_lock_init(&priv->rx.rxbuflock);
 721
 722         for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
 723                 rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
 724                 if (rxbuf == NULL) {
 725                         ath_print(common, ATH_DBG_FATAL,
 726                                   "Unable to allocate RX buffers\n");
 727                         goto err;
 728                 }
 729                 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
 730         }
 731
 732         return 0;
 733
 734 err:
 735         ath9k_rx_cleanup(priv);
 736         return -ENOMEM;
 737 }