drivers/net/wireless/ath/ath9k/htc_drv

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This source file includes following definitions.
get_hw_qnum
ath9k_htc_check_stop_queues
ath9k_htc_check_wake_queues
ath9k_htc_tx_get_slot
ath9k_htc_tx_clear_slot
get_htc_epid
get_htc_epid_queue
strip_drv_header
ath_htc_txq_update
ath9k_htc_tx_mgmt
ath9k_htc_tx_data
ath9k_htc_tx_start
__ath9k_htc_check_tx_aggr
ath9k_htc_check_tx_aggr
ath9k_htc_tx_process
ath9k_htc_tx_drainq
ath9k_htc_tx_drain
ath9k_tx_failed_tasklet
check_cookie
ath9k_htc_tx_get_packet
ath9k_htc_txstatus
ath9k_htc_txep
check_packet
ath9k_htc_tx_cleanup_queue
ath9k_htc_tx_cleanup_timer
ath9k_tx_init
ath9k_tx_cleanup
ath9k_htc_txq_setup
ath9k_htc_cabq_setup
ath9k_htc_calcrxfilter
ath9k_htc_opmode_init
ath9k_host_rx_init
convert_htc_flag
rx_status_htc_to_ath
ath9k_rx_prepare
ath9k_rx_tasklet
ath9k_htc_rxep
ath9k_rx_cleanup
ath9k_rx_init
   1 /*
   2  * Copyright (c) 2010-2011 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         [IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
  25         [IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
  26         [IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
  27         [IEEE80211_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[IEEE80211_AC_VO];
  45         case 1:
  46                 return hwq_map[IEEE80211_AC_VI];
  47         case 2:
  48                 return hwq_map[IEEE80211_AC_BE];
  49         case 3:
  50                 return hwq_map[IEEE80211_AC_BK];
  51         default:
  52                 return hwq_map[IEEE80211_AC_BE];
  53         }
  54 }
  55 
  56 void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
  57 {
  58         spin_lock_bh(&priv->tx.tx_lock);
  59         priv->tx.queued_cnt++;
  60         if ((priv->tx.queued_cnt >= ATH9K_HTC_TX_THRESHOLD) &&
  61             !(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
  62                 priv->tx.flags |= ATH9K_HTC_OP_TX_QUEUES_STOP;
  63                 ieee80211_stop_queues(priv->hw);
  64         }
  65         spin_unlock_bh(&priv->tx.tx_lock);
  66 }
  67 
  68 void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
  69 {
  70         spin_lock_bh(&priv->tx.tx_lock);
  71         if ((priv->tx.queued_cnt < ATH9K_HTC_TX_THRESHOLD) &&
  72             (priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
  73                 priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
  74                 ieee80211_wake_queues(priv->hw);
  75         }
  76         spin_unlock_bh(&priv->tx.tx_lock);
  77 }
  78 
  79 int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
  80 {
  81         int slot;
  82 
  83         spin_lock_bh(&priv->tx.tx_lock);
  84         slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
  85         if (slot >= MAX_TX_BUF_NUM) {
  86                 spin_unlock_bh(&priv->tx.tx_lock);
  87                 return -ENOBUFS;
  88         }
  89         __set_bit(slot, priv->tx.tx_slot);
  90         spin_unlock_bh(&priv->tx.tx_lock);
  91 
  92         return slot;
  93 }
  94 
  95 void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
  96 {
  97         spin_lock_bh(&priv->tx.tx_lock);
  98         __clear_bit(slot, priv->tx.tx_slot);
  99         spin_unlock_bh(&priv->tx.tx_lock);
 100 }
 101 
 102 static inline enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
 103                                                 u16 qnum)
 104 {
 105         enum htc_endpoint_id epid;
 106 
 107         switch (qnum) {
 108         case 0:
 109                 TX_QSTAT_INC(IEEE80211_AC_VO);
 110                 epid = priv->data_vo_ep;
 111                 break;
 112         case 1:
 113                 TX_QSTAT_INC(IEEE80211_AC_VI);
 114                 epid = priv->data_vi_ep;
 115                 break;
 116         case 2:
 117                 TX_QSTAT_INC(IEEE80211_AC_BE);
 118                 epid = priv->data_be_ep;
 119                 break;
 120         case 3:
 121         default:
 122                 TX_QSTAT_INC(IEEE80211_AC_BK);
 123                 epid = priv->data_bk_ep;
 124                 break;
 125         }
 126 
 127         return epid;
 128 }
 129 
 130 static inline struct sk_buff_head*
 131 get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
 132 {
 133         struct ath_common *common = ath9k_hw_common(priv->ah);
 134         struct sk_buff_head *epid_queue = NULL;
 135 
 136         if (epid == priv->mgmt_ep)
 137                 epid_queue = &priv->tx.mgmt_ep_queue;
 138         else if (epid == priv->cab_ep)
 139                 epid_queue = &priv->tx.cab_ep_queue;
 140         else if (epid == priv->data_be_ep)
 141                 epid_queue = &priv->tx.data_be_queue;
 142         else if (epid == priv->data_bk_ep)
 143                 epid_queue = &priv->tx.data_bk_queue;
 144         else if (epid == priv->data_vi_ep)
 145                 epid_queue = &priv->tx.data_vi_queue;
 146         else if (epid == priv->data_vo_ep)
 147                 epid_queue = &priv->tx.data_vo_queue;
 148         else
 149                 ath_err(common, "Invalid EPID: %d\n", epid);
 150 
 151         return epid_queue;
 152 }
 153 
 154 /*
 155  * Removes the driver header and returns the TX slot number
 156  */
 157 static inline int strip_drv_header(struct ath9k_htc_priv *priv,
 158                                    struct sk_buff *skb)
 159 {
 160         struct ath_common *common = ath9k_hw_common(priv->ah);
 161         struct ath9k_htc_tx_ctl *tx_ctl;
 162         int slot;
 163 
 164         tx_ctl = HTC_SKB_CB(skb);
 165 
 166         if (tx_ctl->epid == priv->mgmt_ep) {
 167                 struct tx_mgmt_hdr *tx_mhdr =
 168                         (struct tx_mgmt_hdr *)skb->data;
 169                 slot = tx_mhdr->cookie;
 170                 skb_pull(skb, sizeof(struct tx_mgmt_hdr));
 171         } else if ((tx_ctl->epid == priv->data_bk_ep) ||
 172                    (tx_ctl->epid == priv->data_be_ep) ||
 173                    (tx_ctl->epid == priv->data_vi_ep) ||
 174                    (tx_ctl->epid == priv->data_vo_ep) ||
 175                    (tx_ctl->epid == priv->cab_ep)) {
 176                 struct tx_frame_hdr *tx_fhdr =
 177                         (struct tx_frame_hdr *)skb->data;
 178                 slot = tx_fhdr->cookie;
 179                 skb_pull(skb, sizeof(struct tx_frame_hdr));
 180         } else {
 181                 ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
 182                 slot = -EINVAL;
 183         }
 184 
 185         return slot;
 186 }
 187 
 188 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
 189                        struct ath9k_tx_queue_info *qinfo)
 190 {
 191         struct ath_hw *ah = priv->ah;
 192         int error = 0;
 193         struct ath9k_tx_queue_info qi;
 194 
 195         ath9k_hw_get_txq_props(ah, qnum, &qi);
 196 
 197         qi.tqi_aifs = qinfo->tqi_aifs;
 198         qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
 199         qi.tqi_cwmax = qinfo->tqi_cwmax;
 200         qi.tqi_burstTime = qinfo->tqi_burstTime;
 201         qi.tqi_readyTime = qinfo->tqi_readyTime;
 202 
 203         if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
 204                 ath_err(ath9k_hw_common(ah),
 205                         "Unable to update hardware queue %u!\n", qnum);
 206                 error = -EIO;
 207         } else {
 208                 ath9k_hw_resettxqueue(ah, qnum);
 209         }
 210 
 211         return error;
 212 }
 213 
 214 static void ath9k_htc_tx_mgmt(struct ath9k_htc_priv *priv,
 215                               struct ath9k_htc_vif *avp,
 216                               struct sk_buff *skb,
 217                               u8 sta_idx, u8 vif_idx, u8 slot)
 218 {
 219         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 220         struct ieee80211_mgmt *mgmt;
 221         struct ieee80211_hdr *hdr;
 222         struct tx_mgmt_hdr mgmt_hdr;
 223         struct ath9k_htc_tx_ctl *tx_ctl;
 224         u8 *tx_fhdr;
 225 
 226         tx_ctl = HTC_SKB_CB(skb);
 227         hdr = (struct ieee80211_hdr *) skb->data;
 228 
 229         memset(tx_ctl, 0, sizeof(*tx_ctl));
 230         memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
 231 
 232         /*
 233          * Set the TSF adjust value for probe response
 234          * frame also.
 235          */
 236         if (avp && unlikely(ieee80211_is_probe_resp(hdr->frame_control))) {
 237                 mgmt = (struct ieee80211_mgmt *)skb->data;
 238                 mgmt->u.probe_resp.timestamp = avp->tsfadjust;
 239         }
 240 
 241         tx_ctl->type = ATH9K_HTC_MGMT;
 242 
 243         mgmt_hdr.node_idx = sta_idx;
 244         mgmt_hdr.vif_idx = vif_idx;
 245         mgmt_hdr.tidno = 0;
 246         mgmt_hdr.flags = 0;
 247         mgmt_hdr.cookie = slot;
 248 
 249         mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 250         if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 251                 mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 252         else
 253                 mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 254 
 255         tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
 256         memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
 257         tx_ctl->epid = priv->mgmt_ep;
 258 }
 259 
 260 static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
 261                               struct ieee80211_vif *vif,
 262                               struct sk_buff *skb,
 263                               u8 sta_idx, u8 vif_idx, u8 slot,
 264                               bool is_cab)
 265 {
 266         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 267         struct ieee80211_hdr *hdr;
 268         struct ath9k_htc_tx_ctl *tx_ctl;
 269         struct tx_frame_hdr tx_hdr;
 270         u32 flags = 0;
 271         u8 *qc, *tx_fhdr;
 272         u16 qnum;
 273 
 274         tx_ctl = HTC_SKB_CB(skb);
 275         hdr = (struct ieee80211_hdr *) skb->data;
 276 
 277         memset(tx_ctl, 0, sizeof(*tx_ctl));
 278         memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
 279 
 280         tx_hdr.node_idx = sta_idx;
 281         tx_hdr.vif_idx = vif_idx;
 282         tx_hdr.cookie = slot;
 283 
 284         /*
 285          * This is a bit redundant but it helps to get
 286          * the per-packet index quickly when draining the
 287          * TX queue in the HIF layer. Otherwise we would
 288          * have to parse the packet contents ...
 289          */
 290         tx_ctl->sta_idx = sta_idx;
 291 
 292         if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 293                 tx_ctl->type = ATH9K_HTC_AMPDU;
 294                 tx_hdr.data_type = ATH9K_HTC_AMPDU;
 295         } else {
 296                 tx_ctl->type = ATH9K_HTC_NORMAL;
 297                 tx_hdr.data_type = ATH9K_HTC_NORMAL;
 298         }
 299 
 300         if (ieee80211_is_data_qos(hdr->frame_control)) {
 301                 qc = ieee80211_get_qos_ctl(hdr);
 302                 tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 303         }
 304 
 305         /* Check for RTS protection */
 306         if (priv->hw->wiphy->rts_threshold != (u32) -1)
 307                 if (skb->len > priv->hw->wiphy->rts_threshold)
 308                         flags |= ATH9K_HTC_TX_RTSCTS;
 309 
 310         /* CTS-to-self */
 311         if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
 312             (vif && vif->bss_conf.use_cts_prot))
 313                 flags |= ATH9K_HTC_TX_CTSONLY;
 314 
 315         tx_hdr.flags = cpu_to_be32(flags);
 316         tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 317         if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 318                 tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 319         else
 320                 tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
 321 
 322         tx_fhdr = skb_push(skb, sizeof(tx_hdr));
 323         memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
 324 
 325         if (is_cab) {
 326                 CAB_STAT_INC;
 327                 tx_ctl->epid = priv->cab_ep;
 328                 return;
 329         }
 330 
 331         qnum = skb_get_queue_mapping(skb);
 332         tx_ctl->epid = get_htc_epid(priv, qnum);
 333 }
 334 
 335 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
 336                        struct ieee80211_sta *sta,
 337                        struct sk_buff *skb,
 338                        u8 slot, bool is_cab)
 339 {
 340         struct ieee80211_hdr *hdr;
 341         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 342         struct ieee80211_vif *vif = tx_info->control.vif;
 343         struct ath9k_htc_sta *ista;
 344         struct ath9k_htc_vif *avp = NULL;
 345         u8 sta_idx, vif_idx;
 346 
 347         hdr = (struct ieee80211_hdr *) skb->data;
 348 
 349         /*
 350          * Find out on which interface this packet has to be
 351          * sent out.
 352          */
 353         if (vif) {
 354                 avp = (struct ath9k_htc_vif *) vif->drv_priv;
 355                 vif_idx = avp->index;
 356         } else {
 357                 if (!priv->ah->is_monitoring) {
 358                         ath_dbg(ath9k_hw_common(priv->ah), XMIT,
 359                                 "VIF is null, but no monitor interface !\n");
 360                         return -EINVAL;
 361                 }
 362 
 363                 vif_idx = priv->mon_vif_idx;
 364         }
 365 
 366         /*
 367          * Find out which station this packet is destined for.
 368          */
 369         if (sta) {
 370                 ista = (struct ath9k_htc_sta *) sta->drv_priv;
 371                 sta_idx = ista->index;
 372         } else {
 373                 sta_idx = priv->vif_sta_pos[vif_idx];
 374         }
 375 
 376         if (ieee80211_is_data(hdr->frame_control))
 377                 ath9k_htc_tx_data(priv, vif, skb,
 378                                   sta_idx, vif_idx, slot, is_cab);
 379         else
 380                 ath9k_htc_tx_mgmt(priv, avp, skb,
 381                                   sta_idx, vif_idx, slot);
 382 
 383 
 384         return htc_send(priv->htc, skb);
 385 }
 386 
 387 static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 388                                              struct ath9k_htc_sta *ista, u8 tid)
 389 {
 390         bool ret = false;
 391 
 392         spin_lock_bh(&priv->tx.tx_lock);
 393         if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
 394                 ret = true;
 395         spin_unlock_bh(&priv->tx.tx_lock);
 396 
 397         return ret;
 398 }
 399 
 400 static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
 401                                     struct ieee80211_vif *vif,
 402                                     struct sk_buff *skb)
 403 {
 404         struct ieee80211_sta *sta;
 405         struct ieee80211_hdr *hdr;
 406         __le16 fc;
 407 
 408         hdr = (struct ieee80211_hdr *) skb->data;
 409         fc = hdr->frame_control;
 410 
 411         rcu_read_lock();
 412 
 413         sta = ieee80211_find_sta(vif, hdr->addr1);
 414         if (!sta) {
 415                 rcu_read_unlock();
 416                 return;
 417         }
 418 
 419         if (sta && conf_is_ht(&priv->hw->conf) &&
 420             !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 421                 if (ieee80211_is_data_qos(fc)) {
 422                         u8 *qc, tid;
 423                         struct ath9k_htc_sta *ista;
 424 
 425                         qc = ieee80211_get_qos_ctl(hdr);
 426                         tid = qc[0] & 0xf;
 427                         ista = (struct ath9k_htc_sta *)sta->drv_priv;
 428                         if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
 429                                 ieee80211_start_tx_ba_session(sta, tid, 0);
 430                                 spin_lock_bh(&priv->tx.tx_lock);
 431                                 ista->tid_state[tid] = AGGR_PROGRESS;
 432                                 spin_unlock_bh(&priv->tx.tx_lock);
 433                         }
 434                 }
 435         }
 436 
 437         rcu_read_unlock();
 438 }
 439 
 440 static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
 441                                  struct sk_buff *skb,
 442                                  struct __wmi_event_txstatus *txs)
 443 {
 444         struct ieee80211_vif *vif;
 445         struct ath9k_htc_tx_ctl *tx_ctl;
 446         struct ieee80211_tx_info *tx_info;
 447         struct ieee80211_tx_rate *rate;
 448         struct ieee80211_conf *cur_conf = &priv->hw->conf;
 449         bool txok;
 450         int slot;
 451         int hdrlen, padsize;
 452 
 453         slot = strip_drv_header(priv, skb);
 454         if (slot < 0) {
 455                 dev_kfree_skb_any(skb);
 456                 return;
 457         }
 458 
 459         tx_ctl = HTC_SKB_CB(skb);
 460         txok = tx_ctl->txok;
 461         tx_info = IEEE80211_SKB_CB(skb);
 462         vif = tx_info->control.vif;
 463         rate = &tx_info->status.rates[0];
 464 
 465         memset(&tx_info->status, 0, sizeof(tx_info->status));
 466 
 467         /*
 468          * URB submission failed for this frame, it never reached
 469          * the target.
 470          */
 471         if (!txok || !vif || !txs)
 472                 goto send_mac80211;
 473 
 474         if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
 475                 tx_info->flags |= IEEE80211_TX_STAT_ACK;
 476                 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
 477                         tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
 478         }
 479 
 480         if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
 481                 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 482 
 483         if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
 484                 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
 485 
 486         rate->count = 1;
 487         rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
 488 
 489         if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
 490                 rate->flags |= IEEE80211_TX_RC_MCS;
 491 
 492                 if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
 493                         rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 494                 if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
 495                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 496         } else {
 497                 if (cur_conf->chandef.chan->band == NL80211_BAND_5GHZ)
 498                         rate->idx += 4; /* No CCK rates */
 499         }
 500 
 501         ath9k_htc_check_tx_aggr(priv, vif, skb);
 502 
 503 send_mac80211:
 504         spin_lock_bh(&priv->tx.tx_lock);
 505         if (WARN_ON(--priv->tx.queued_cnt < 0))
 506                 priv->tx.queued_cnt = 0;
 507         spin_unlock_bh(&priv->tx.tx_lock);
 508 
 509         ath9k_htc_tx_clear_slot(priv, slot);
 510 
 511         /* Remove padding before handing frame back to mac80211 */
 512         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 513 
 514         padsize = hdrlen & 3;
 515         if (padsize && skb->len > hdrlen + padsize) {
 516                 memmove(skb->data + padsize, skb->data, hdrlen);
 517                 skb_pull(skb, padsize);
 518         }
 519 
 520         /* Send status to mac80211 */
 521         ieee80211_tx_status(priv->hw, skb);
 522 }
 523 
 524 static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
 525                                        struct sk_buff_head *queue)
 526 {
 527         struct sk_buff *skb;
 528 
 529         while ((skb = skb_dequeue(queue)) != NULL) {
 530                 ath9k_htc_tx_process(priv, skb, NULL);
 531         }
 532 }
 533 
 534 void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
 535 {
 536         struct ath9k_htc_tx_event *event, *tmp;
 537 
 538         spin_lock_bh(&priv->tx.tx_lock);
 539         priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
 540         spin_unlock_bh(&priv->tx.tx_lock);
 541 
 542         /*
 543          * Ensure that all pending TX frames are flushed,
 544          * and that the TX completion/failed tasklets is killed.
 545          */
 546         htc_stop(priv->htc);
 547         tasklet_kill(&priv->wmi->wmi_event_tasklet);
 548         tasklet_kill(&priv->tx_failed_tasklet);
 549 
 550         ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
 551         ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
 552         ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
 553         ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
 554         ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
 555         ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
 556         ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
 557 
 558         /*
 559          * The TX cleanup timer has already been killed.
 560          */
 561         spin_lock_bh(&priv->wmi->event_lock);
 562         list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
 563                 list_del(&event->list);
 564                 kfree(event);
 565         }
 566         spin_unlock_bh(&priv->wmi->event_lock);
 567 
 568         spin_lock_bh(&priv->tx.tx_lock);
 569         priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
 570         spin_unlock_bh(&priv->tx.tx_lock);
 571 }
 572 
 573 void ath9k_tx_failed_tasklet(unsigned long data)
 574 {
 575         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 576 
 577         spin_lock(&priv->tx.tx_lock);
 578         if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
 579                 spin_unlock(&priv->tx.tx_lock);
 580                 return;
 581         }
 582         spin_unlock(&priv->tx.tx_lock);
 583 
 584         ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
 585 }
 586 
 587 static inline bool check_cookie(struct ath9k_htc_priv *priv,
 588                                 struct sk_buff *skb,
 589                                 u8 cookie, u8 epid)
 590 {
 591         u8 fcookie = 0;
 592 
 593         if (epid == priv->mgmt_ep) {
 594                 struct tx_mgmt_hdr *hdr;
 595                 hdr = (struct tx_mgmt_hdr *) skb->data;
 596                 fcookie = hdr->cookie;
 597         } else if ((epid == priv->data_bk_ep) ||
 598                    (epid == priv->data_be_ep) ||
 599                    (epid == priv->data_vi_ep) ||
 600                    (epid == priv->data_vo_ep) ||
 601                    (epid == priv->cab_ep)) {
 602                 struct tx_frame_hdr *hdr;
 603                 hdr = (struct tx_frame_hdr *) skb->data;
 604                 fcookie = hdr->cookie;
 605         }
 606 
 607         if (fcookie == cookie)
 608                 return true;
 609 
 610         return false;
 611 }
 612 
 613 static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
 614                                                struct __wmi_event_txstatus *txs)
 615 {
 616         struct ath_common *common = ath9k_hw_common(priv->ah);
 617         struct sk_buff_head *epid_queue;
 618         struct sk_buff *skb, *tmp;
 619         unsigned long flags;
 620         u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
 621 
 622         epid_queue = get_htc_epid_queue(priv, epid);
 623         if (!epid_queue)
 624                 return NULL;
 625 
 626         spin_lock_irqsave(&epid_queue->lock, flags);
 627         skb_queue_walk_safe(epid_queue, skb, tmp) {
 628                 if (check_cookie(priv, skb, txs->cookie, epid)) {
 629                         __skb_unlink(skb, epid_queue);
 630                         spin_unlock_irqrestore(&epid_queue->lock, flags);
 631                         return skb;
 632                 }
 633         }
 634         spin_unlock_irqrestore(&epid_queue->lock, flags);
 635 
 636         ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
 637                 txs->cookie, epid);
 638 
 639         return NULL;
 640 }
 641 
 642 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
 643 {
 644         struct wmi_event_txstatus *txs = wmi_event;
 645         struct __wmi_event_txstatus *__txs;
 646         struct sk_buff *skb;
 647         struct ath9k_htc_tx_event *tx_pend;
 648         int i;
 649 
 650         for (i = 0; i < txs->cnt; i++) {
 651                 WARN_ON(txs->cnt > HTC_MAX_TX_STATUS);
 652 
 653                 __txs = &txs->txstatus[i];
 654 
 655                 skb = ath9k_htc_tx_get_packet(priv, __txs);
 656                 if (!skb) {
 657                         /*
 658                          * Store this event, so that the TX cleanup
 659                          * routine can check later for the needed packet.
 660                          */
 661                         tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
 662                                           GFP_ATOMIC);
 663                         if (!tx_pend)
 664                                 continue;
 665 
 666                         memcpy(&tx_pend->txs, __txs,
 667                                sizeof(struct __wmi_event_txstatus));
 668 
 669                         spin_lock(&priv->wmi->event_lock);
 670                         list_add_tail(&tx_pend->list,
 671                                       &priv->wmi->pending_tx_events);
 672                         spin_unlock(&priv->wmi->event_lock);
 673 
 674                         continue;
 675                 }
 676 
 677                 ath9k_htc_tx_process(priv, skb, __txs);
 678         }
 679 
 680         /* Wake TX queues if needed */
 681         ath9k_htc_check_wake_queues(priv);
 682 }
 683 
 684 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
 685                     enum htc_endpoint_id ep_id, bool txok)
 686 {
 687         struct ath9k_htc_priv *priv = drv_priv;
 688         struct ath9k_htc_tx_ctl *tx_ctl;
 689         struct sk_buff_head *epid_queue;
 690 
 691         tx_ctl = HTC_SKB_CB(skb);
 692         tx_ctl->txok = txok;
 693         tx_ctl->timestamp = jiffies;
 694 
 695         if (!txok) {
 696                 skb_queue_tail(&priv->tx.tx_failed, skb);
 697                 tasklet_schedule(&priv->tx_failed_tasklet);
 698                 return;
 699         }
 700 
 701         epid_queue = get_htc_epid_queue(priv, ep_id);
 702         if (!epid_queue) {
 703                 dev_kfree_skb_any(skb);
 704                 return;
 705         }
 706 
 707         skb_queue_tail(epid_queue, skb);
 708 }
 709 
 710 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
 711 {
 712         struct ath_common *common = ath9k_hw_common(priv->ah);
 713         struct ath9k_htc_tx_ctl *tx_ctl;
 714 
 715         tx_ctl = HTC_SKB_CB(skb);
 716 
 717         if (time_after(jiffies,
 718                        tx_ctl->timestamp +
 719                        msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
 720                 ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
 721                 return true;
 722         }
 723 
 724         return false;
 725 }
 726 
 727 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
 728                                        struct sk_buff_head *epid_queue)
 729 {
 730         bool process = false;
 731         unsigned long flags;
 732         struct sk_buff *skb, *tmp;
 733         struct sk_buff_head queue;
 734 
 735         skb_queue_head_init(&queue);
 736 
 737         spin_lock_irqsave(&epid_queue->lock, flags);
 738         skb_queue_walk_safe(epid_queue, skb, tmp) {
 739                 if (check_packet(priv, skb)) {
 740                         __skb_unlink(skb, epid_queue);
 741                         __skb_queue_tail(&queue, skb);
 742                         process = true;
 743                 }
 744         }
 745         spin_unlock_irqrestore(&epid_queue->lock, flags);
 746 
 747         if (process) {
 748                 skb_queue_walk_safe(&queue, skb, tmp) {
 749                         __skb_unlink(skb, &queue);
 750                         ath9k_htc_tx_process(priv, skb, NULL);
 751                 }
 752         }
 753 }
 754 
 755 void ath9k_htc_tx_cleanup_timer(struct timer_list *t)
 756 {
 757         struct ath9k_htc_priv *priv = from_timer(priv, t, tx.cleanup_timer);
 758         struct ath_common *common = ath9k_hw_common(priv->ah);
 759         struct ath9k_htc_tx_event *event, *tmp;
 760         struct sk_buff *skb;
 761 
 762         spin_lock(&priv->wmi->event_lock);
 763         list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
 764 
 765                 skb = ath9k_htc_tx_get_packet(priv, &event->txs);
 766                 if (skb) {
 767                         ath_dbg(common, XMIT,
 768                                 "Found packet for cookie: %d, epid: %d\n",
 769                                 event->txs.cookie,
 770                                 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
 771 
 772                         ath9k_htc_tx_process(priv, skb, &event->txs);
 773                         list_del(&event->list);
 774                         kfree(event);
 775                         continue;
 776                 }
 777 
 778                 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
 779                         list_del(&event->list);
 780                         kfree(event);
 781                 }
 782         }
 783         spin_unlock(&priv->wmi->event_lock);
 784 
 785         /*
 786          * Check if status-pending packets have to be cleaned up.
 787          */
 788         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
 789         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
 790         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
 791         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
 792         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
 793         ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
 794 
 795         /* Wake TX queues if needed */
 796         ath9k_htc_check_wake_queues(priv);
 797 
 798         mod_timer(&priv->tx.cleanup_timer,
 799                   jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
 800 }
 801 
 802 int ath9k_tx_init(struct ath9k_htc_priv *priv)
 803 {
 804         skb_queue_head_init(&priv->tx.mgmt_ep_queue);
 805         skb_queue_head_init(&priv->tx.cab_ep_queue);
 806         skb_queue_head_init(&priv->tx.data_be_queue);
 807         skb_queue_head_init(&priv->tx.data_bk_queue);
 808         skb_queue_head_init(&priv->tx.data_vi_queue);
 809         skb_queue_head_init(&priv->tx.data_vo_queue);
 810         skb_queue_head_init(&priv->tx.tx_failed);
 811         return 0;
 812 }
 813 
 814 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
 815 {
 816 
 817 }
 818 
 819 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
 820 {
 821         struct ath_hw *ah = priv->ah;
 822         struct ath_common *common = ath9k_hw_common(ah);
 823         struct ath9k_tx_queue_info qi;
 824         int qnum;
 825 
 826         memset(&qi, 0, sizeof(qi));
 827         ATH9K_HTC_INIT_TXQ(subtype);
 828 
 829         qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
 830         if (qnum == -1)
 831                 return false;
 832 
 833         if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
 834                 ath_err(common, "qnum %u out of range, max %zu!\n",
 835                         qnum, ARRAY_SIZE(priv->hwq_map));
 836                 ath9k_hw_releasetxqueue(ah, qnum);
 837                 return false;
 838         }
 839 
 840         priv->hwq_map[subtype] = qnum;
 841         return true;
 842 }
 843 
 844 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
 845 {
 846         struct ath9k_tx_queue_info qi;
 847 
 848         memset(&qi, 0, sizeof(qi));
 849         ATH9K_HTC_INIT_TXQ(0);
 850 
 851         return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
 852 }
 853 
 854 /******/
 855 /* RX */
 856 /******/
 857 
 858 /*
 859  * Calculate the RX filter to be set in the HW.
 860  */
 861 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
 862 {
 863 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
 864 
 865         struct ath_hw *ah = priv->ah;
 866         u32 rfilt;
 867 
 868         rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
 869                 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
 870                 | ATH9K_RX_FILTER_MCAST;
 871 
 872         if (priv->rxfilter & FIF_PROBE_REQ)
 873                 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
 874 
 875         if (ah->is_monitoring)
 876                 rfilt |= ATH9K_RX_FILTER_PROM;
 877 
 878         if (priv->rxfilter & FIF_CONTROL)
 879                 rfilt |= ATH9K_RX_FILTER_CONTROL;
 880 
 881         if ((ah->opmode == NL80211_IFTYPE_STATION) &&
 882             (priv->nvifs <= 1) &&
 883             !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
 884                 rfilt |= ATH9K_RX_FILTER_MYBEACON;
 885         else
 886                 rfilt |= ATH9K_RX_FILTER_BEACON;
 887 
 888         if (conf_is_ht(&priv->hw->conf)) {
 889                 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
 890                 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
 891         }
 892 
 893         if (priv->rxfilter & FIF_PSPOLL)
 894                 rfilt |= ATH9K_RX_FILTER_PSPOLL;
 895 
 896         if (priv->nvifs > 1 || priv->rxfilter & FIF_OTHER_BSS)
 897                 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
 898 
 899         return rfilt;
 900 
 901 #undef RX_FILTER_PRESERVE
 902 }
 903 
 904 /*
 905  * Recv initialization for opmode change.
 906  */
 907 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
 908 {
 909         struct ath_hw *ah = priv->ah;
 910         u32 rfilt, mfilt[2];
 911 
 912         /* configure rx filter */
 913         rfilt = ath9k_htc_calcrxfilter(priv);
 914         ath9k_hw_setrxfilter(ah, rfilt);
 915 
 916         /* calculate and install multicast filter */
 917         mfilt[0] = mfilt[1] = ~0;
 918         ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
 919 }
 920 
 921 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
 922 {
 923         struct ath_common *common = ath9k_hw_common(priv->ah);
 924         ath9k_hw_rxena(priv->ah);
 925         ath9k_htc_opmode_init(priv);
 926         ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
 927 }
 928 
 929 static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
 930                                    struct ath_htc_rx_status *rxstatus)
 931 {
 932         rx_stats->enc_flags = 0;
 933         rx_stats->bw = RATE_INFO_BW_20;
 934         if (rxstatus->rs_flags & ATH9K_RX_2040)
 935                 rx_stats->bw = RATE_INFO_BW_40;
 936         if (rxstatus->rs_flags & ATH9K_RX_GI)
 937                 rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
 938 }
 939 
 940 static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
 941                                  struct ath_htc_rx_status *rxstatus)
 942 {
 943         rx_stats->rs_datalen    = be16_to_cpu(rxstatus->rs_datalen);
 944         rx_stats->rs_status     = rxstatus->rs_status;
 945         rx_stats->rs_phyerr     = rxstatus->rs_phyerr;
 946         rx_stats->rs_rssi       = rxstatus->rs_rssi;
 947         rx_stats->rs_keyix      = rxstatus->rs_keyix;
 948         rx_stats->rs_rate       = rxstatus->rs_rate;
 949         rx_stats->rs_antenna    = rxstatus->rs_antenna;
 950         rx_stats->rs_more       = rxstatus->rs_more;
 951 
 952         memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
 953                 sizeof(rx_stats->rs_rssi_ctl));
 954         memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
 955                 sizeof(rx_stats->rs_rssi_ext));
 956 
 957         rx_stats->rs_isaggr     = rxstatus->rs_isaggr;
 958         rx_stats->rs_moreaggr   = rxstatus->rs_moreaggr;
 959         rx_stats->rs_num_delims = rxstatus->rs_num_delims;
 960         convert_htc_flag(rx_stats, rxstatus);
 961 }
 962 
 963 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 964                              struct ath9k_htc_rxbuf *rxbuf,
 965                              struct ieee80211_rx_status *rx_status)
 966 
 967 {
 968         struct ieee80211_hdr *hdr;
 969         struct ieee80211_hw *hw = priv->hw;
 970         struct sk_buff *skb = rxbuf->skb;
 971         struct ath_common *common = ath9k_hw_common(priv->ah);
 972         struct ath_hw *ah = common->ah;
 973         struct ath_htc_rx_status *rxstatus;
 974         struct ath_rx_status rx_stats;
 975         bool decrypt_error = false;
 976         __be16 rs_datalen;
 977         bool is_phyerr;
 978 
 979         if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
 980                 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
 981                         skb->len);
 982                 goto rx_next;
 983         }
 984 
 985         rxstatus = (struct ath_htc_rx_status *)skb->data;
 986 
 987         rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
 988         if (unlikely(rs_datalen -
 989             (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
 990                 ath_err(common,
 991                         "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
 992                         rs_datalen, skb->len);
 993                 goto rx_next;
 994         }
 995 
 996         is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
 997         /*
 998          * Discard zero-length packets and packets smaller than an ACK
 999          * which are not PHY_ERROR (short radar pulses have a length of 3)
1000          */
1001         if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
1002                 ath_dbg(common, ANY,
1003                         "Short RX data len, dropping (dlen: %d)\n",
1004                         rs_datalen);
1005                 goto rx_next;
1006         }
1007 
1008         /* Get the RX status information */
1009 
1010         memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1011 
1012         /* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1013          * After this, we can drop this part of skb. */
1014         rx_status_htc_to_ath(&rx_stats, rxstatus);
1015         ath9k_htc_err_stat_rx(priv, &rx_stats);
1016         rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1017         skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1018 
1019         /*
1020          * everything but the rate is checked here, the rate check is done
1021          * separately to avoid doing two lookups for a rate for each frame.
1022          */
1023         hdr = (struct ieee80211_hdr *)skb->data;
1024 
1025         /*
1026          * Process PHY errors and return so that the packet
1027          * can be dropped.
1028          */
1029         if (unlikely(is_phyerr)) {
1030                 /* TODO: Not using DFS processing now. */
1031                 if (ath_cmn_process_fft(&priv->spec_priv, hdr,
1032                                     &rx_stats, rx_status->mactime)) {
1033                         /* TODO: Code to collect spectral scan statistics */
1034                 }
1035                 goto rx_next;
1036         }
1037 
1038         if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
1039                         &decrypt_error, priv->rxfilter))
1040                 goto rx_next;
1041 
1042         ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
1043                                      rx_status, decrypt_error);
1044 
1045         if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
1046                 goto rx_next;
1047 
1048         rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1049         ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
1050 
1051         rx_status->band = ah->curchan->chan->band;
1052         rx_status->freq = ah->curchan->chan->center_freq;
1053         rx_status->antenna = rx_stats.rs_antenna;
1054         rx_status->flag |= RX_FLAG_MACTIME_END;
1055 
1056         return true;
1057 rx_next:
1058         return false;
1059 }
1060 
1061 /*
1062  * FIXME: Handle FLUSH later on.
1063  */
1064 void ath9k_rx_tasklet(unsigned long data)
1065 {
1066         struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
1067         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1068         struct ieee80211_rx_status rx_status;
1069         struct sk_buff *skb;
1070         unsigned long flags;
1071         struct ieee80211_hdr *hdr;
1072 
1073         do {
1074                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1075                 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1076                         if (tmp_buf->in_process) {
1077                                 rxbuf = tmp_buf;
1078                                 break;
1079                         }
1080                 }
1081 
1082                 if (rxbuf == NULL) {
1083                         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1084                         break;
1085                 }
1086 
1087                 if (!rxbuf->skb)
1088                         goto requeue;
1089 
1090                 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1091                         dev_kfree_skb_any(rxbuf->skb);
1092                         goto requeue;
1093                 }
1094 
1095                 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1096                        sizeof(struct ieee80211_rx_status));
1097                 skb = rxbuf->skb;
1098                 hdr = (struct ieee80211_hdr *) skb->data;
1099 
1100                 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1101                                 ieee80211_queue_work(priv->hw, &priv->ps_work);
1102 
1103                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1104 
1105                 ieee80211_rx(priv->hw, skb);
1106 
1107                 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1108 requeue:
1109                 rxbuf->in_process = false;
1110                 rxbuf->skb = NULL;
1111                 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1112                 rxbuf = NULL;
1113                 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1114         } while (1);
1115 
1116 }
1117 
1118 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1119                     enum htc_endpoint_id ep_id)
1120 {
1121         struct ath9k_htc_priv *priv = drv_priv;
1122         struct ath_hw *ah = priv->ah;
1123         struct ath_common *common = ath9k_hw_common(ah);
1124         struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1125         unsigned long flags;
1126 
1127         spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1128         list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1129                 if (!tmp_buf->in_process) {
1130                         rxbuf = tmp_buf;
1131                         break;
1132                 }
1133         }
1134         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1135 
1136         if (rxbuf == NULL) {
1137                 ath_dbg(common, ANY, "No free RX buffer\n");
1138                 goto err;
1139         }
1140 
1141         spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1142         rxbuf->skb = skb;
1143         rxbuf->in_process = true;
1144         spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1145 
1146         tasklet_schedule(&priv->rx_tasklet);
1147         return;
1148 err:
1149         dev_kfree_skb_any(skb);
1150 }
1151 
1152 /* FIXME: Locking for cleanup/init */
1153 
1154 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1155 {
1156         struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1157 
1158         list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1159                 list_del(&rxbuf->list);
1160                 if (rxbuf->skb)
1161                         dev_kfree_skb_any(rxbuf->skb);
1162                 kfree(rxbuf);
1163         }
1164 }
1165 
1166 int ath9k_rx_init(struct ath9k_htc_priv *priv)
1167 {
1168         int i = 0;
1169 
1170         INIT_LIST_HEAD(&priv->rx.rxbuf);
1171         spin_lock_init(&priv->rx.rxbuflock);
1172 
1173         for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1174                 struct ath9k_htc_rxbuf *rxbuf =
1175                         kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1176                 if (rxbuf == NULL)
1177                         goto err;
1178 
1179                 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1180         }
1181 
1182         return 0;
1183 
1184 err:
1185         ath9k_rx_cleanup(priv);
1186         return -ENOMEM;
1187 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c

DEFINITIONS
