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 }