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_err(ath9k_hw_common(ah),
  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                 u32 flags = 0;
 117                 u8 *qc;
 118
 119                 memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
 120
 121                 tx_hdr.node_idx = sta_idx;
 122                 tx_hdr.vif_idx = vif_idx;
 123
 124                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 125                         tx_ctl.type = ATH9K_HTC_AMPDU;
 126                         tx_hdr.data_type = ATH9K_HTC_AMPDU;
 127                 } else {
 128                         tx_ctl.type = ATH9K_HTC_NORMAL;
 129                         tx_hdr.data_type = ATH9K_HTC_NORMAL;
 130                 }
 131
 132                 if (ieee80211_is_data_qos(fc)) {
 133                         qc = ieee80211_get_qos_ctl(hdr);
 134                         tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 135                 }
 136
 137                 /* Check for RTS protection */
 138                 if (priv->hw->wiphy->rts_threshold != (u32) -1)
 139                         if (skb->len > priv->hw->wiphy->rts_threshold)
 140                                 flags |= ATH9K_HTC_TX_RTSCTS;
 141
 142                 /* CTS-to-self */
 143                 if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
 144                     (priv->op_flags & OP_PROTECT_ENABLE))
 145                         flags |= ATH9K_HTC_TX_CTSONLY;
 146
 147                 tx_hdr.flags = cpu_to_be32(flags);
 148                 tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 149                 if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 150                         tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 151                 else
 152                         tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 153
 154                 tx_fhdr = skb_push(skb, sizeof(tx_hdr));
 155                 memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
 156
 157                 qnum = skb_get_queue_mapping(skb);
 158
 159                 switch (qnum) {
 160                 case 0:
 161                         TX_QSTAT_INC(WME_AC_VO);
 162                         epid = priv->data_vo_ep;
 163                         break;
 164                 case 1:
 165                         TX_QSTAT_INC(WME_AC_VI);
 166                         epid = priv->data_vi_ep;
 167                         break;
 168                 case 2:
 169                         TX_QSTAT_INC(WME_AC_BE);
 170                         epid = priv->data_be_ep;
 171                         break;
 172                 case 3:
 173                 default:
 174                         TX_QSTAT_INC(WME_AC_BK);
 175                         epid = priv->data_bk_ep;
 176                         break;
 177                 }
 178         } else {
 179                 struct tx_mgmt_hdr mgmt_hdr;
 180
 181                 memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
 182
 183                 tx_ctl.type = ATH9K_HTC_NORMAL;
 184
 185                 mgmt_hdr.node_idx = sta_idx;
 186                 mgmt_hdr.vif_idx = vif_idx;
 187                 mgmt_hdr.tidno = 0;
 188                 mgmt_hdr.flags = 0;
 189
 190                 mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 191                 if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 192                         mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 193                 else
 194                         mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 195
 196                 tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
 197                 memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
 198                 epid = priv->mgmt_ep;
 199         }
 200
 201         return htc_send(priv->htc, skb, epid, &tx_ctl);
 202 }
 203
 204 static bool ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 205                                     struct ath9k_htc_sta *ista, u8 tid)
 206 {
 207         bool ret = false;
 208
 209         spin_lock_bh(&priv->tx_lock);
 210         if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
 211                 ret = true;
 212         spin_unlock_bh(&priv->tx_lock);
 213
 214         return ret;
 215 }
 216
 217 void ath9k_tx_tasklet(unsigned long data)
 218 {
 219         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 220         struct ieee80211_sta *sta;
 221         struct ieee80211_hdr *hdr;
 222         struct ieee80211_tx_info *tx_info;
 223         struct sk_buff *skb = NULL;
 224         __le16 fc;
 225
 226         while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {
 227
 228                 hdr = (struct ieee80211_hdr *) skb->data;
 229                 fc = hdr->frame_control;
 230                 tx_info = IEEE80211_SKB_CB(skb);
 231
 232                 memset(&tx_info->status, 0, sizeof(tx_info->status));
 233
 234                 rcu_read_lock();
 235
 236                 sta = ieee80211_find_sta(priv->vif, hdr->addr1);
 237                 if (!sta) {
 238                         rcu_read_unlock();
 239                         ieee80211_tx_status(priv->hw, skb);
 240                         continue;
 241                 }
 242
 243                 /* Check if we need to start aggregation */
 244
 245                 if (sta && conf_is_ht(&priv->hw->conf) &&
 246                     !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 247                         if (ieee80211_is_data_qos(fc)) {
 248                                 u8 *qc, tid;
 249                                 struct ath9k_htc_sta *ista;
 250
 251                                 qc = ieee80211_get_qos_ctl(hdr);
 252                                 tid = qc[0] & 0xf;
 253                                 ista = (struct ath9k_htc_sta *)sta->drv_priv;
 254
 255                                 if (ath9k_htc_check_tx_aggr(priv, ista, tid)) {
 256                                         ieee80211_start_tx_ba_session(sta, tid, 0);
 257                                         spin_lock_bh(&priv->tx_lock);
 258                                         ista->tid_state[tid] = AGGR_PROGRESS;
 259                                         spin_unlock_bh(&priv->tx_lock);
 260                                 }
 261                         }
 262                 }
 263
 264                 rcu_read_unlock();
 265
 266                 /* Send status to mac80211 */
 267                 ieee80211_tx_status(priv->hw, skb);
 268         }
 269
 270         /* Wake TX queues if needed */
 271         spin_lock_bh(&priv->tx_lock);
 272         if (priv->tx_queues_stop) {
 273                 priv->tx_queues_stop = false;
 274                 spin_unlock_bh(&priv->tx_lock);
 275                 ath_dbg(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
 276                         "Waking up TX queues\n");
 277                 ieee80211_wake_queues(priv->hw);
 278                 return;
 279         }
 280         spin_unlock_bh(&priv->tx_lock);
 281 }
 282
 283 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
 284                     enum htc_endpoint_id ep_id, bool txok)
 285 {
 286         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
 287         struct ath_common *common = ath9k_hw_common(priv->ah);
 288         struct ieee80211_tx_info *tx_info;
 289
 290         if (!skb)
 291                 return;
 292
 293         if (ep_id == priv->mgmt_ep) {
 294                 skb_pull(skb, sizeof(struct tx_mgmt_hdr));
 295         } else if ((ep_id == priv->data_bk_ep) ||
 296                    (ep_id == priv->data_be_ep) ||
 297                    (ep_id == priv->data_vi_ep) ||
 298                    (ep_id == priv->data_vo_ep)) {
 299                 skb_pull(skb, sizeof(struct tx_frame_hdr));
 300         } else {
 301                 ath_err(common, "Unsupported TX EPID: %d\n", ep_id);
 302                 dev_kfree_skb_any(skb);
 303                 return;
 304         }
 305
 306         tx_info = IEEE80211_SKB_CB(skb);
 307
 308         if (txok)
 309                 tx_info->flags |= IEEE80211_TX_STAT_ACK;
 310
 311         skb_queue_tail(&priv->tx_queue, skb);
 312         tasklet_schedule(&priv->tx_tasklet);
 313 }
 314
 315 int ath9k_tx_init(struct ath9k_htc_priv *priv)
 316 {
 317         skb_queue_head_init(&priv->tx_queue);
 318         return 0;
 319 }
 320
 321 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
 322 {
 323
 324 }
 325
 326 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
 327 {
 328         struct ath_hw *ah = priv->ah;
 329         struct ath_common *common = ath9k_hw_common(ah);
 330         struct ath9k_tx_queue_info qi;
 331         int qnum;
 332
 333         memset(&qi, 0, sizeof(qi));
 334         ATH9K_HTC_INIT_TXQ(subtype);
 335
 336         qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
 337         if (qnum == -1)
 338                 return false;
 339
 340         if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
 341                 ath_err(common, "qnum %u out of range, max %zu!\n",
 342                         qnum, 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_err(common, "Corrupted RX frame, dropping\n");
 494                 goto rx_next;
 495         }
 496
 497         rxstatus = (struct ath_htc_rx_status *)skb->data;
 498
 499         if (be16_to_cpu(rxstatus->rs_datalen) -
 500             (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
 501                 ath_err(common,
 502                         "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
 503                         rxstatus->rs_datalen, skb->len);
 504                 goto rx_next;
 505         }
 506
 507         /* Get the RX status information */
 508         memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
 509         skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
 510
 511         hdr = (struct ieee80211_hdr *)skb->data;
 512         fc = hdr->frame_control;
 513         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 514
 515         padpos = ath9k_cmn_padpos(fc);
 516
 517         padsize = padpos & 3;
 518         if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
 519                 memmove(skb->data + padsize, skb->data, padpos);
 520                 skb_pull(skb, padsize);
 521         }
 522
 523         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
 524
 525         if (rxbuf->rxstatus.rs_status != 0) {
 526                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
 527                         rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 528                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
 529                         goto rx_next;
 530
 531                 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
 532                         /* FIXME */
 533                 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
 534                         if (ieee80211_is_ctl(fc))
 535                                 /*
 536                                  * Sometimes, we get invalid
 537                                  * MIC failures on valid control frames.
 538                                  * Remove these mic errors.
 539                                  */
 540                                 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
 541                         else
 542                                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
 543                 }
 544
 545                 /*
 546                  * Reject error frames with the exception of
 547                  * decryption and MIC failures. For monitor mode,
 548                  * we also ignore the CRC error.
 549                  */
 550                 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
 551                         if (rxbuf->rxstatus.rs_status &
 552                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
 553                               ATH9K_RXERR_CRC))
 554                                 goto rx_next;
 555                 } else {
 556                         if (rxbuf->rxstatus.rs_status &
 557                             ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
 558                                 goto rx_next;
 559                         }
 560                 }
 561         }
 562
 563         if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
 564                 u8 keyix;
 565                 keyix = rxbuf->rxstatus.rs_keyix;
 566                 if (keyix != ATH9K_RXKEYIX_INVALID) {
 567                         rx_status->flag |= RX_FLAG_DECRYPTED;
 568                 } else if (ieee80211_has_protected(fc) &&
 569                            skb->len >= hdrlen + 4) {
 570                         keyix = skb->data[hdrlen + 3] >> 6;
 571                         if (test_bit(keyix, common->keymap))
 572                                 rx_status->flag |= RX_FLAG_DECRYPTED;
 573                 }
 574         }
 575
 576         ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
 577                            rxbuf->rxstatus.rs_flags);
 578
 579         if (priv->op_flags & OP_ASSOCIATED) {
 580                 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
 581                     !rxbuf->rxstatus.rs_moreaggr)
 582                         ATH_RSSI_LPF(priv->rx.last_rssi,
 583                                      rxbuf->rxstatus.rs_rssi);
 584
 585                 last_rssi = priv->rx.last_rssi;
 586
 587                 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
 588                         rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
 589                                                              ATH_RSSI_EP_MULTIPLIER);
 590
 591                 if (rxbuf->rxstatus.rs_rssi < 0)
 592                         rxbuf->rxstatus.rs_rssi = 0;
 593
 594                 if (ieee80211_is_beacon(fc))
 595                         priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
 596         }
 597
 598         rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
 599         rx_status->band = hw->conf.channel->band;
 600         rx_status->freq = hw->conf.channel->center_freq;
 601         rx_status->signal =  rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
 602         rx_status->antenna = rxbuf->rxstatus.rs_antenna;
 603         rx_status->flag |= RX_FLAG_TSFT;
 604
 605         return true;
 606
 607 rx_next:
 608         return false;
 609 }
 610
 611 /*
 612  * FIXME: Handle FLUSH later on.
 613  */
 614 void ath9k_rx_tasklet(unsigned long data)
 615 {
 616         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 617         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
 618         struct ieee80211_rx_status rx_status;
 619         struct sk_buff *skb;
 620         unsigned long flags;
 621         struct ieee80211_hdr *hdr;
 622
 623         do {
 624                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 625                 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 626                         if (tmp_buf->in_process) {
 627                                 rxbuf = tmp_buf;
 628                                 break;
 629                         }
 630                 }
 631
 632                 if (rxbuf == NULL) {
 633                         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 634                         break;
 635                 }
 636
 637                 if (!rxbuf->skb)
 638                         goto requeue;
 639
 640                 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
 641                         dev_kfree_skb_any(rxbuf->skb);
 642                         goto requeue;
 643                 }
 644
 645                 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
 646                        sizeof(struct ieee80211_rx_status));
 647                 skb = rxbuf->skb;
 648                 hdr = (struct ieee80211_hdr *) skb->data;
 649
 650                 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
 651                                 ieee80211_queue_work(priv->hw, &priv->ps_work);
 652
 653                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 654
 655                 ieee80211_rx(priv->hw, skb);
 656
 657                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 658 requeue:
 659                 rxbuf->in_process = false;
 660                 rxbuf->skb = NULL;
 661                 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
 662                 rxbuf = NULL;
 663                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 664         } while (1);
 665
 666 }
 667
 668 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
 669                     enum htc_endpoint_id ep_id)
 670 {
 671         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
 672         struct ath_hw *ah = priv->ah;
 673         struct ath_common *common = ath9k_hw_common(ah);
 674         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
 675
 676         spin_lock(&priv->rx.rxbuflock);
 677         list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 678                 if (!tmp_buf->in_process) {
 679                         rxbuf = tmp_buf;
 680                         break;
 681                 }
 682         }
 683         spin_unlock(&priv->rx.rxbuflock);
 684
 685         if (rxbuf == NULL) {
 686                 ath_dbg(common, ATH_DBG_ANY,
 687                         "No free RX buffer\n");
 688                 goto err;
 689         }
 690
 691         spin_lock(&priv->rx.rxbuflock);
 692         rxbuf->skb = skb;
 693         rxbuf->in_process = true;
 694         spin_unlock(&priv->rx.rxbuflock);
 695
 696         tasklet_schedule(&priv->rx_tasklet);
 697         return;
 698 err:
 699         dev_kfree_skb_any(skb);
 700 }
 701
 702 /* FIXME: Locking for cleanup/init */
 703
 704 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
 705 {
 706         struct ath9k_htc_rxbuf *rxbuf, *tbuf;
 707
 708         list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
 709                 list_del(&rxbuf->list);
 710                 if (rxbuf->skb)
 711                         dev_kfree_skb_any(rxbuf->skb);
 712                 kfree(rxbuf);
 713         }
 714 }
 715
 716 int ath9k_rx_init(struct ath9k_htc_priv *priv)
 717 {
 718         struct ath_hw *ah = priv->ah;
 719         struct ath_common *common = ath9k_hw_common(ah);
 720         struct ath9k_htc_rxbuf *rxbuf;
 721         int i = 0;
 722
 723         INIT_LIST_HEAD(&priv->rx.rxbuf);
 724         spin_lock_init(&priv->rx.rxbuflock);
 725
 726         for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
 727                 rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
 728                 if (rxbuf == NULL) {
 729                         ath_err(common, "Unable to allocate RX buffers\n");
 730                         goto err;
 731                 }
 732                 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
 733         }
 734
 735         return 0;
 736
 737 err:
 738         ath9k_rx_cleanup(priv);
 739         return -ENOMEM;
 740 }