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 [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 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(WME_AC_VO); 110 epid = priv->data_vo_ep; 111 break; 112 case 1: 113 TX_QSTAT_INC(WME_AC_VI); 114 epid = priv->data_vi_ep; 115 break; 116 case 2: 117 TX_QSTAT_INC(WME_AC_BE); 118 epid = priv->data_be_ep; 119 break; 120 case 3: 121 default: 122 TX_QSTAT_INC(WME_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 sk_buff *skb, 337 u8 slot, bool is_cab) 338 { 339 struct ieee80211_hdr *hdr; 340 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); 341 struct ieee80211_sta *sta = tx_info->control.sta; 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), ATH_DBG_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; 451 452 slot = strip_drv_header(priv, skb); 453 if (slot < 0) { 454 dev_kfree_skb_any(skb); 455 return; 456 } 457 458 tx_ctl = HTC_SKB_CB(skb); 459 txok = tx_ctl->txok; 460 tx_info = IEEE80211_SKB_CB(skb); 461 vif = tx_info->control.vif; 462 rate = &tx_info->status.rates[0]; 463 464 memset(&tx_info->status, 0, sizeof(tx_info->status)); 465 466 /* 467 * URB submission failed for this frame, it never reached 468 * the target. 469 */ 470 if (!txok || !vif || !txs) 471 goto send_mac80211; 472 473 if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) 474 tx_info->flags |= IEEE80211_TX_STAT_ACK; 475 476 if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT) 477 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED; 478 479 if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS) 480 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS; 481 482 rate->count = 1; 483 rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE); 484 485 if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) { 486 rate->flags |= IEEE80211_TX_RC_MCS; 487 488 if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40) 489 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 490 if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI) 491 rate->flags |= IEEE80211_TX_RC_SHORT_GI; 492 } else { 493 if (cur_conf->channel->band == IEEE80211_BAND_5GHZ) 494 rate->idx += 4; /* No CCK rates */ 495 } 496 497 ath9k_htc_check_tx_aggr(priv, vif, skb); 498 499 send_mac80211: 500 spin_lock_bh(&priv->tx.tx_lock); 501 if (WARN_ON(--priv->tx.queued_cnt < 0)) 502 priv->tx.queued_cnt = 0; 503 spin_unlock_bh(&priv->tx.tx_lock); 504 505 ath9k_htc_tx_clear_slot(priv, slot); 506 507 /* Send status to mac80211 */ 508 ieee80211_tx_status(priv->hw, skb); 509 } 510 511 static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv, 512 struct sk_buff_head *queue) 513 { 514 struct sk_buff *skb; 515 516 while ((skb = skb_dequeue(queue)) != NULL) { 517 ath9k_htc_tx_process(priv, skb, NULL); 518 } 519 } 520 521 void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv) 522 { 523 struct ath9k_htc_tx_event *event, *tmp; 524 525 spin_lock_bh(&priv->tx.tx_lock); 526 priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN; 527 spin_unlock_bh(&priv->tx.tx_lock); 528 529 /* 530 * Ensure that all pending TX frames are flushed, 531 * and that the TX completion/failed tasklets is killed. 532 */ 533 htc_stop(priv->htc); 534 tasklet_kill(&priv->wmi->wmi_event_tasklet); 535 tasklet_kill(&priv->tx_failed_tasklet); 536 537 ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue); 538 ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue); 539 ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue); 540 ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue); 541 ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue); 542 ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue); 543 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed); 544 545 /* 546 * The TX cleanup timer has already been killed. 547 */ 548 spin_lock_bh(&priv->wmi->event_lock); 549 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) { 550 list_del(&event->list); 551 kfree(event); 552 } 553 spin_unlock_bh(&priv->wmi->event_lock); 554 555 spin_lock_bh(&priv->tx.tx_lock); 556 priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN; 557 spin_unlock_bh(&priv->tx.tx_lock); 558 } 559 560 void ath9k_tx_failed_tasklet(unsigned long data) 561 { 562 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data; 563 564 spin_lock_bh(&priv->tx.tx_lock); 565 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) { 566 spin_unlock_bh(&priv->tx.tx_lock); 567 return; 568 } 569 spin_unlock_bh(&priv->tx.tx_lock); 570 571 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed); 572 } 573 574 static inline bool check_cookie(struct ath9k_htc_priv *priv, 575 struct sk_buff *skb, 576 u8 cookie, u8 epid) 577 { 578 u8 fcookie = 0; 579 580 if (epid == priv->mgmt_ep) { 581 struct tx_mgmt_hdr *hdr; 582 hdr = (struct tx_mgmt_hdr *) skb->data; 583 fcookie = hdr->cookie; 584 } else if ((epid == priv->data_bk_ep) || 585 (epid == priv->data_be_ep) || 586 (epid == priv->data_vi_ep) || 587 (epid == priv->data_vo_ep) || 588 (epid == priv->cab_ep)) { 589 struct tx_frame_hdr *hdr; 590 hdr = (struct tx_frame_hdr *) skb->data; 591 fcookie = hdr->cookie; 592 } 593 594 if (fcookie == cookie) 595 return true; 596 597 return false; 598 } 599 600 static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv, 601 struct __wmi_event_txstatus *txs) 602 { 603 struct ath_common *common = ath9k_hw_common(priv->ah); 604 struct sk_buff_head *epid_queue; 605 struct sk_buff *skb, *tmp; 606 unsigned long flags; 607 u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID); 608 609 epid_queue = get_htc_epid_queue(priv, epid); 610 if (!epid_queue) 611 return NULL; 612 613 spin_lock_irqsave(&epid_queue->lock, flags); 614 skb_queue_walk_safe(epid_queue, skb, tmp) { 615 if (check_cookie(priv, skb, txs->cookie, epid)) { 616 __skb_unlink(skb, epid_queue); 617 spin_unlock_irqrestore(&epid_queue->lock, flags); 618 return skb; 619 } 620 } 621 spin_unlock_irqrestore(&epid_queue->lock, flags); 622 623 ath_dbg(common, ATH_DBG_XMIT, 624 "No matching packet for cookie: %d, epid: %d\n", 625 txs->cookie, epid); 626 627 return NULL; 628 } 629 630 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event) 631 { 632 struct wmi_event_txstatus *txs = (struct wmi_event_txstatus *)wmi_event; 633 struct __wmi_event_txstatus *__txs; 634 struct sk_buff *skb; 635 struct ath9k_htc_tx_event *tx_pend; 636 int i; 637 638 for (i = 0; i < txs->cnt; i++) { 639 WARN_ON(txs->cnt > HTC_MAX_TX_STATUS); 640 641 __txs = &txs->txstatus[i]; 642 643 skb = ath9k_htc_tx_get_packet(priv, __txs); 644 if (!skb) { 645 /* 646 * Store this event, so that the TX cleanup 647 * routine can check later for the needed packet. 648 */ 649 tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event), 650 GFP_ATOMIC); 651 if (!tx_pend) 652 continue; 653 654 memcpy(&tx_pend->txs, __txs, 655 sizeof(struct __wmi_event_txstatus)); 656 657 spin_lock(&priv->wmi->event_lock); 658 list_add_tail(&tx_pend->list, 659 &priv->wmi->pending_tx_events); 660 spin_unlock(&priv->wmi->event_lock); 661 662 continue; 663 } 664 665 ath9k_htc_tx_process(priv, skb, __txs); 666 } 667 668 /* Wake TX queues if needed */ 669 ath9k_htc_check_wake_queues(priv); 670 } 671 672 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb, 673 enum htc_endpoint_id ep_id, bool txok) 674 { 675 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv; 676 struct ath9k_htc_tx_ctl *tx_ctl; 677 struct sk_buff_head *epid_queue; 678 679 tx_ctl = HTC_SKB_CB(skb); 680 tx_ctl->txok = txok; 681 tx_ctl->timestamp = jiffies; 682 683 if (!txok) { 684 skb_queue_tail(&priv->tx.tx_failed, skb); 685 tasklet_schedule(&priv->tx_failed_tasklet); 686 return; 687 } 688 689 epid_queue = get_htc_epid_queue(priv, ep_id); 690 if (!epid_queue) { 691 dev_kfree_skb_any(skb); 692 return; 693 } 694 695 skb_queue_tail(epid_queue, skb); 696 } 697 698 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb) 699 { 700 struct ath_common *common = ath9k_hw_common(priv->ah); 701 struct ath9k_htc_tx_ctl *tx_ctl; 702 703 tx_ctl = HTC_SKB_CB(skb); 704 705 if (time_after(jiffies, 706 tx_ctl->timestamp + 707 msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) { 708 ath_dbg(common, ATH_DBG_XMIT, 709 "Dropping a packet due to TX timeout\n"); 710 return true; 711 } 712 713 return false; 714 } 715 716 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv, 717 struct sk_buff_head *epid_queue) 718 { 719 bool process = false; 720 unsigned long flags; 721 struct sk_buff *skb, *tmp; 722 struct sk_buff_head queue; 723 724 skb_queue_head_init(&queue); 725 726 spin_lock_irqsave(&epid_queue->lock, flags); 727 skb_queue_walk_safe(epid_queue, skb, tmp) { 728 if (check_packet(priv, skb)) { 729 __skb_unlink(skb, epid_queue); 730 __skb_queue_tail(&queue, skb); 731 process = true; 732 } 733 } 734 spin_unlock_irqrestore(&epid_queue->lock, flags); 735 736 if (process) { 737 skb_queue_walk_safe(&queue, skb, tmp) { 738 __skb_unlink(skb, &queue); 739 ath9k_htc_tx_process(priv, skb, NULL); 740 } 741 } 742 } 743 744 void ath9k_htc_tx_cleanup_timer(unsigned long data) 745 { 746 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) data; 747 struct ath_common *common = ath9k_hw_common(priv->ah); 748 struct ath9k_htc_tx_event *event, *tmp; 749 struct sk_buff *skb; 750 751 spin_lock(&priv->wmi->event_lock); 752 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) { 753 754 skb = ath9k_htc_tx_get_packet(priv, &event->txs); 755 if (skb) { 756 ath_dbg(common, ATH_DBG_XMIT, 757 "Found packet for cookie: %d, epid: %d\n", 758 event->txs.cookie, 759 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID)); 760 761 ath9k_htc_tx_process(priv, skb, &event->txs); 762 list_del(&event->list); 763 kfree(event); 764 continue; 765 } 766 767 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) { 768 list_del(&event->list); 769 kfree(event); 770 } 771 } 772 spin_unlock(&priv->wmi->event_lock); 773 774 /* 775 * Check if status-pending packets have to be cleaned up. 776 */ 777 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue); 778 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue); 779 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue); 780 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue); 781 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue); 782 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue); 783 784 /* Wake TX queues if needed */ 785 ath9k_htc_check_wake_queues(priv); 786 787 mod_timer(&priv->tx.cleanup_timer, 788 jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL)); 789 } 790 791 int ath9k_tx_init(struct ath9k_htc_priv *priv) 792 { 793 skb_queue_head_init(&priv->tx.mgmt_ep_queue); 794 skb_queue_head_init(&priv->tx.cab_ep_queue); 795 skb_queue_head_init(&priv->tx.data_be_queue); 796 skb_queue_head_init(&priv->tx.data_bk_queue); 797 skb_queue_head_init(&priv->tx.data_vi_queue); 798 skb_queue_head_init(&priv->tx.data_vo_queue); 799 skb_queue_head_init(&priv->tx.tx_failed); 800 return 0; 801 } 802 803 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv) 804 { 805 806 } 807 808 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype) 809 { 810 struct ath_hw *ah = priv->ah; 811 struct ath_common *common = ath9k_hw_common(ah); 812 struct ath9k_tx_queue_info qi; 813 int qnum; 814 815 memset(&qi, 0, sizeof(qi)); 816 ATH9K_HTC_INIT_TXQ(subtype); 817 818 qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi); 819 if (qnum == -1) 820 return false; 821 822 if (qnum >= ARRAY_SIZE(priv->hwq_map)) { 823 ath_err(common, "qnum %u out of range, max %zu!\n", 824 qnum, ARRAY_SIZE(priv->hwq_map)); 825 ath9k_hw_releasetxqueue(ah, qnum); 826 return false; 827 } 828 829 priv->hwq_map[subtype] = qnum; 830 return true; 831 } 832 833 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv) 834 { 835 struct ath9k_tx_queue_info qi; 836 837 memset(&qi, 0, sizeof(qi)); 838 ATH9K_HTC_INIT_TXQ(0); 839 840 return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi); 841 } 842 843 /******/ 844 /* RX */ 845 /******/ 846 847 /* 848 * Calculate the RX filter to be set in the HW. 849 */ 850 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv) 851 { 852 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR) 853 854 struct ath_hw *ah = priv->ah; 855 u32 rfilt; 856 857 rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE) 858 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST 859 | ATH9K_RX_FILTER_MCAST; 860 861 if (priv->rxfilter & FIF_PROBE_REQ) 862 rfilt |= ATH9K_RX_FILTER_PROBEREQ; 863 864 /* 865 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station 866 * mode interface or when in monitor mode. AP mode does not need this 867 * since it receives all in-BSS frames anyway. 868 */ 869 if (((ah->opmode != NL80211_IFTYPE_AP) && 870 (priv->rxfilter & FIF_PROMISC_IN_BSS)) || 871 ah->is_monitoring) 872 rfilt |= ATH9K_RX_FILTER_PROM; 873 874 if (priv->rxfilter & FIF_CONTROL) 875 rfilt |= ATH9K_RX_FILTER_CONTROL; 876 877 if ((ah->opmode == NL80211_IFTYPE_STATION) && 878 (priv->nvifs <= 1) && 879 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC)) 880 rfilt |= ATH9K_RX_FILTER_MYBEACON; 881 else 882 rfilt |= ATH9K_RX_FILTER_BEACON; 883 884 if (conf_is_ht(&priv->hw->conf)) { 885 rfilt |= ATH9K_RX_FILTER_COMP_BAR; 886 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR; 887 } 888 889 if (priv->rxfilter & FIF_PSPOLL) 890 rfilt |= ATH9K_RX_FILTER_PSPOLL; 891 892 if (priv->nvifs > 1) 893 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL; 894 895 return rfilt; 896 897 #undef RX_FILTER_PRESERVE 898 } 899 900 /* 901 * Recv initialization for opmode change. 902 */ 903 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv) 904 { 905 struct ath_hw *ah = priv->ah; 906 u32 rfilt, mfilt[2]; 907 908 /* configure rx filter */ 909 rfilt = ath9k_htc_calcrxfilter(priv); 910 ath9k_hw_setrxfilter(ah, rfilt); 911 912 /* calculate and install multicast filter */ 913 mfilt[0] = mfilt[1] = ~0; 914 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); 915 } 916 917 void ath9k_host_rx_init(struct ath9k_htc_priv *priv) 918 { 919 ath9k_hw_rxena(priv->ah); 920 ath9k_htc_opmode_init(priv); 921 ath9k_hw_startpcureceive(priv->ah, (priv->op_flags & OP_SCANNING)); 922 priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER; 923 } 924 925 static void ath9k_process_rate(struct ieee80211_hw *hw, 926 struct ieee80211_rx_status *rxs, 927 u8 rx_rate, u8 rs_flags) 928 { 929 struct ieee80211_supported_band *sband; 930 enum ieee80211_band band; 931 unsigned int i = 0; 932 933 if (rx_rate & 0x80) { 934 /* HT rate */ 935 rxs->flag |= RX_FLAG_HT; 936 if (rs_flags & ATH9K_RX_2040) 937 rxs->flag |= RX_FLAG_40MHZ; 938 if (rs_flags & ATH9K_RX_GI) 939 rxs->flag |= RX_FLAG_SHORT_GI; 940 rxs->rate_idx = rx_rate & 0x7f; 941 return; 942 } 943 944 band = hw->conf.channel->band; 945 sband = hw->wiphy->bands[band]; 946 947 for (i = 0; i < sband->n_bitrates; i++) { 948 if (sband->bitrates[i].hw_value == rx_rate) { 949 rxs->rate_idx = i; 950 return; 951 } 952 if (sband->bitrates[i].hw_value_short == rx_rate) { 953 rxs->rate_idx = i; 954 rxs->flag |= RX_FLAG_SHORTPRE; 955 return; 956 } 957 } 958 959 } 960 961 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv, 962 struct ath9k_htc_rxbuf *rxbuf, 963 struct ieee80211_rx_status *rx_status) 964 965 { 966 struct ieee80211_hdr *hdr; 967 struct ieee80211_hw *hw = priv->hw; 968 struct sk_buff *skb = rxbuf->skb; 969 struct ath_common *common = ath9k_hw_common(priv->ah); 970 struct ath_htc_rx_status *rxstatus; 971 int hdrlen, padpos, padsize; 972 int last_rssi = ATH_RSSI_DUMMY_MARKER; 973 __le16 fc; 974 975 if (skb->len < HTC_RX_FRAME_HEADER_SIZE) { 976 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n", 977 skb->len); 978 goto rx_next; 979 } 980 981 rxstatus = (struct ath_htc_rx_status *)skb->data; 982 983 if (be16_to_cpu(rxstatus->rs_datalen) - 984 (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) { 985 ath_err(common, 986 "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n", 987 rxstatus->rs_datalen, skb->len); 988 goto rx_next; 989 } 990 991 ath9k_htc_err_stat_rx(priv, rxstatus); 992 993 /* Get the RX status information */ 994 memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE); 995 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE); 996 997 hdr = (struct ieee80211_hdr *)skb->data; 998 fc = hdr->frame_control; 999 hdrlen = ieee80211_get_hdrlen_from_skb(skb); 1000 1001 padpos = ath9k_cmn_padpos(fc); 1002 1003 padsize = padpos & 3; 1004 if (padsize && skb->len >= padpos+padsize+FCS_LEN) { 1005 memmove(skb->data + padsize, skb->data, padpos); 1006 skb_pull(skb, padsize); 1007 } 1008 1009 memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); 1010 1011 if (rxbuf->rxstatus.rs_status != 0) { 1012 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC) 1013 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 1014 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY) 1015 goto rx_next; 1016 1017 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) { 1018 /* FIXME */ 1019 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) { 1020 if (ieee80211_is_ctl(fc)) 1021 /* 1022 * Sometimes, we get invalid 1023 * MIC failures on valid control frames. 1024 * Remove these mic errors. 1025 */ 1026 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC; 1027 else 1028 rx_status->flag |= RX_FLAG_MMIC_ERROR; 1029 } 1030 1031 /* 1032 * Reject error frames with the exception of 1033 * decryption and MIC failures. For monitor mode, 1034 * we also ignore the CRC error. 1035 */ 1036 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) { 1037 if (rxbuf->rxstatus.rs_status & 1038 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | 1039 ATH9K_RXERR_CRC)) 1040 goto rx_next; 1041 } else { 1042 if (rxbuf->rxstatus.rs_status & 1043 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { 1044 goto rx_next; 1045 } 1046 } 1047 } 1048 1049 if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) { 1050 u8 keyix; 1051 keyix = rxbuf->rxstatus.rs_keyix; 1052 if (keyix != ATH9K_RXKEYIX_INVALID) { 1053 rx_status->flag |= RX_FLAG_DECRYPTED; 1054 } else if (ieee80211_has_protected(fc) && 1055 skb->len >= hdrlen + 4) { 1056 keyix = skb->data[hdrlen + 3] >> 6; 1057 if (test_bit(keyix, common->keymap)) 1058 rx_status->flag |= RX_FLAG_DECRYPTED; 1059 } 1060 } 1061 1062 ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate, 1063 rxbuf->rxstatus.rs_flags); 1064 1065 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD && 1066 !rxbuf->rxstatus.rs_moreaggr) 1067 ATH_RSSI_LPF(priv->rx.last_rssi, 1068 rxbuf->rxstatus.rs_rssi); 1069 1070 last_rssi = priv->rx.last_rssi; 1071 1072 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER)) 1073 rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi, 1074 ATH_RSSI_EP_MULTIPLIER); 1075 1076 if (rxbuf->rxstatus.rs_rssi < 0) 1077 rxbuf->rxstatus.rs_rssi = 0; 1078 1079 if (ieee80211_is_beacon(fc)) 1080 priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi; 1081 1082 rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp); 1083 rx_status->band = hw->conf.channel->band; 1084 rx_status->freq = hw->conf.channel->center_freq; 1085 rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR; 1086 rx_status->antenna = rxbuf->rxstatus.rs_antenna; 1087 rx_status->flag |= RX_FLAG_MACTIME_MPDU; 1088 1089 return true; 1090 1091 rx_next: 1092 return false; 1093 } 1094 1095 /* 1096 * FIXME: Handle FLUSH later on. 1097 */ 1098 void ath9k_rx_tasklet(unsigned long data) 1099 { 1100 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data; 1101 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL; 1102 struct ieee80211_rx_status rx_status; 1103 struct sk_buff *skb; 1104 unsigned long flags; 1105 struct ieee80211_hdr *hdr; 1106 1107 do { 1108 spin_lock_irqsave(&priv->rx.rxbuflock, flags); 1109 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) { 1110 if (tmp_buf->in_process) { 1111 rxbuf = tmp_buf; 1112 break; 1113 } 1114 } 1115 1116 if (rxbuf == NULL) { 1117 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags); 1118 break; 1119 } 1120 1121 if (!rxbuf->skb) 1122 goto requeue; 1123 1124 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) { 1125 dev_kfree_skb_any(rxbuf->skb); 1126 goto requeue; 1127 } 1128 1129 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status, 1130 sizeof(struct ieee80211_rx_status)); 1131 skb = rxbuf->skb; 1132 hdr = (struct ieee80211_hdr *) skb->data; 1133 1134 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled) 1135 ieee80211_queue_work(priv->hw, &priv->ps_work); 1136 1137 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags); 1138 1139 ieee80211_rx(priv->hw, skb); 1140 1141 spin_lock_irqsave(&priv->rx.rxbuflock, flags); 1142 requeue: 1143 rxbuf->in_process = false; 1144 rxbuf->skb = NULL; 1145 list_move_tail(&rxbuf->list, &priv->rx.rxbuf); 1146 rxbuf = NULL; 1147 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags); 1148 } while (1); 1149 1150 } 1151 1152 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb, 1153 enum htc_endpoint_id ep_id) 1154 { 1155 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv; 1156 struct ath_hw *ah = priv->ah; 1157 struct ath_common *common = ath9k_hw_common(ah); 1158 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL; 1159 1160 spin_lock(&priv->rx.rxbuflock); 1161 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) { 1162 if (!tmp_buf->in_process) { 1163 rxbuf = tmp_buf; 1164 break; 1165 } 1166 } 1167 spin_unlock(&priv->rx.rxbuflock); 1168 1169 if (rxbuf == NULL) { 1170 ath_dbg(common, ATH_DBG_ANY, 1171 "No free RX buffer\n"); 1172 goto err; 1173 } 1174 1175 spin_lock(&priv->rx.rxbuflock); 1176 rxbuf->skb = skb; 1177 rxbuf->in_process = true; 1178 spin_unlock(&priv->rx.rxbuflock); 1179 1180 tasklet_schedule(&priv->rx_tasklet); 1181 return; 1182 err: 1183 dev_kfree_skb_any(skb); 1184 } 1185 1186 /* FIXME: Locking for cleanup/init */ 1187 1188 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv) 1189 { 1190 struct ath9k_htc_rxbuf *rxbuf, *tbuf; 1191 1192 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) { 1193 list_del(&rxbuf->list); 1194 if (rxbuf->skb) 1195 dev_kfree_skb_any(rxbuf->skb); 1196 kfree(rxbuf); 1197 } 1198 } 1199 1200 int ath9k_rx_init(struct ath9k_htc_priv *priv) 1201 { 1202 struct ath_hw *ah = priv->ah; 1203 struct ath_common *common = ath9k_hw_common(ah); 1204 struct ath9k_htc_rxbuf *rxbuf; 1205 int i = 0; 1206 1207 INIT_LIST_HEAD(&priv->rx.rxbuf); 1208 spin_lock_init(&priv->rx.rxbuflock); 1209 1210 for (i = 0; i < ATH9K_HTC_RXBUF; i++) { 1211 rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL); 1212 if (rxbuf == NULL) { 1213 ath_err(common, "Unable to allocate RX buffers\n"); 1214 goto err; 1215 } 1216 list_add_tail(&rxbuf->list, &priv->rx.rxbuf); 1217 } 1218 1219 return 0; 1220 1221 err: 1222 ath9k_rx_cleanup(priv); 1223 return -ENOMEM; 1224 } 1225