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; 451 452 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->chandef.chan->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, XMIT, "No matching packet for cookie: %d, epid: %d\n", 624 txs->cookie, epid); 625 626 return NULL; 627 } 628 629 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event) 630 { 631 struct wmi_event_txstatus *txs = (struct wmi_event_txstatus *)wmi_event; 632 struct __wmi_event_txstatus *__txs; 633 struct sk_buff *skb; 634 struct ath9k_htc_tx_event *tx_pend; 635 int i; 636 637 for (i = 0; i < txs->cnt; i++) { 638 WARN_ON(txs->cnt > HTC_MAX_TX_STATUS); 639 640 __txs = &txs->txstatus[i]; 641 642 skb = ath9k_htc_tx_get_packet(priv, __txs); 643 if (!skb) { 644 /* 645 * Store this event, so that the TX cleanup 646 * routine can check later for the needed packet. 647 */ 648 tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event), 649 GFP_ATOMIC); 650 if (!tx_pend) 651 continue; 652 653 memcpy(&tx_pend->txs, __txs, 654 sizeof(struct __wmi_event_txstatus)); 655 656 spin_lock(&priv->wmi->event_lock); 657 list_add_tail(&tx_pend->list, 658 &priv->wmi->pending_tx_events); 659 spin_unlock(&priv->wmi->event_lock); 660 661 continue; 662 } 663 664 ath9k_htc_tx_process(priv, skb, __txs); 665 } 666 667 /* Wake TX queues if needed */ 668 ath9k_htc_check_wake_queues(priv); 669 } 670 671 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb, 672 enum htc_endpoint_id ep_id, bool txok) 673 { 674 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv; 675 struct ath9k_htc_tx_ctl *tx_ctl; 676 struct sk_buff_head *epid_queue; 677 678 tx_ctl = HTC_SKB_CB(skb); 679 tx_ctl->txok = txok; 680 tx_ctl->timestamp = jiffies; 681 682 if (!txok) { 683 skb_queue_tail(&priv->tx.tx_failed, skb); 684 tasklet_schedule(&priv->tx_failed_tasklet); 685 return; 686 } 687 688 epid_queue = get_htc_epid_queue(priv, ep_id); 689 if (!epid_queue) { 690 dev_kfree_skb_any(skb); 691 return; 692 } 693 694 skb_queue_tail(epid_queue, skb); 695 } 696 697 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb) 698 { 699 struct ath_common *common = ath9k_hw_common(priv->ah); 700 struct ath9k_htc_tx_ctl *tx_ctl; 701 702 tx_ctl = HTC_SKB_CB(skb); 703 704 if (time_after(jiffies, 705 tx_ctl->timestamp + 706 msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) { 707 ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n"); 708 return true; 709 } 710 711 return false; 712 } 713 714 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv, 715 struct sk_buff_head *epid_queue) 716 { 717 bool process = false; 718 unsigned long flags; 719 struct sk_buff *skb, *tmp; 720 struct sk_buff_head queue; 721 722 skb_queue_head_init(&queue); 723 724 spin_lock_irqsave(&epid_queue->lock, flags); 725 skb_queue_walk_safe(epid_queue, skb, tmp) { 726 if (check_packet(priv, skb)) { 727 __skb_unlink(skb, epid_queue); 728 __skb_queue_tail(&queue, skb); 729 process = true; 730 } 731 } 732 spin_unlock_irqrestore(&epid_queue->lock, flags); 733 734 if (process) { 735 skb_queue_walk_safe(&queue, skb, tmp) { 736 __skb_unlink(skb, &queue); 737 ath9k_htc_tx_process(priv, skb, NULL); 738 } 739 } 740 } 741 742 void ath9k_htc_tx_cleanup_timer(unsigned long data) 743 { 744 struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) data; 745 struct ath_common *common = ath9k_hw_common(priv->ah); 746 struct ath9k_htc_tx_event *event, *tmp; 747 struct sk_buff *skb; 748 749 spin_lock(&priv->wmi->event_lock); 750 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) { 751 752 skb = ath9k_htc_tx_get_packet(priv, &event->txs); 753 if (skb) { 754 ath_dbg(common, XMIT, 755 "Found packet for cookie: %d, epid: %d\n", 756 event->txs.cookie, 757 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID)); 758 759 ath9k_htc_tx_process(priv, skb, &event->txs); 760 list_del(&event->list); 761 kfree(event); 762 continue; 763 } 764 765 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) { 766 list_del(&event->list); 767 kfree(event); 768 } 769 } 770 spin_unlock(&priv->wmi->event_lock); 771 772 /* 773 * Check if status-pending packets have to be cleaned up. 774 */ 775 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue); 776 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue); 777 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue); 778 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue); 779 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue); 780 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue); 781 782 /* Wake TX queues if needed */ 783 ath9k_htc_check_wake_queues(priv); 784 785 mod_timer(&priv->tx.cleanup_timer, 786 jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL)); 787 } 788 789 int ath9k_tx_init(struct ath9k_htc_priv *priv) 790 { 791 skb_queue_head_init(&priv->tx.mgmt_ep_queue); 792 skb_queue_head_init(&priv->tx.cab_ep_queue); 793 skb_queue_head_init(&priv->tx.data_be_queue); 794 skb_queue_head_init(&priv->tx.data_bk_queue); 795 skb_queue_head_init(&priv->tx.data_vi_queue); 796 skb_queue_head_init(&priv->tx.data_vo_queue); 797 skb_queue_head_init(&priv->tx.tx_failed); 798 return 0; 799 } 800 801 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv) 802 { 803 804 } 805 806 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype) 807 { 808 struct ath_hw *ah = priv->ah; 809 struct ath_common *common = ath9k_hw_common(ah); 810 struct ath9k_tx_queue_info qi; 811 int qnum; 812 813 memset(&qi, 0, sizeof(qi)); 814 ATH9K_HTC_INIT_TXQ(subtype); 815 816 qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi); 817 if (qnum == -1) 818 return false; 819 820 if (qnum >= ARRAY_SIZE(priv->hwq_map)) { 821 ath_err(common, "qnum %u out of range, max %zu!\n", 822 qnum, ARRAY_SIZE(priv->hwq_map)); 823 ath9k_hw_releasetxqueue(ah, qnum); 824 return false; 825 } 826 827 priv->hwq_map[subtype] = qnum; 828 return true; 829 } 830 831 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv) 832 { 833 struct ath9k_tx_queue_info qi; 834 835 memset(&qi, 0, sizeof(qi)); 836 ATH9K_HTC_INIT_TXQ(0); 837 838 return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi); 839 } 840 841 /******/ 842 /* RX */ 843 /******/ 844 845 /* 846 * Calculate the RX filter to be set in the HW. 847 */ 848 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv) 849 { 850 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR) 851 852 struct ath_hw *ah = priv->ah; 853 u32 rfilt; 854 855 rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE) 856 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST 857 | ATH9K_RX_FILTER_MCAST; 858 859 if (priv->rxfilter & FIF_PROBE_REQ) 860 rfilt |= ATH9K_RX_FILTER_PROBEREQ; 861 862 /* 863 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station 864 * mode interface or when in monitor mode. AP mode does not need this 865 * since it receives all in-BSS frames anyway. 866 */ 867 if (((ah->opmode != NL80211_IFTYPE_AP) && 868 (priv->rxfilter & FIF_PROMISC_IN_BSS)) || 869 ah->is_monitoring) 870 rfilt |= ATH9K_RX_FILTER_PROM; 871 872 if (priv->rxfilter & FIF_CONTROL) 873 rfilt |= ATH9K_RX_FILTER_CONTROL; 874 875 if ((ah->opmode == NL80211_IFTYPE_STATION) && 876 (priv->nvifs <= 1) && 877 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC)) 878 rfilt |= ATH9K_RX_FILTER_MYBEACON; 879 else 880 rfilt |= ATH9K_RX_FILTER_BEACON; 881 882 if (conf_is_ht(&priv->hw->conf)) { 883 rfilt |= ATH9K_RX_FILTER_COMP_BAR; 884 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR; 885 } 886 887 if (priv->rxfilter & FIF_PSPOLL) 888 rfilt |= ATH9K_RX_FILTER_PSPOLL; 889 890 if (priv->nvifs > 1) 891 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL; 892 893 return rfilt; 894 895 #undef RX_FILTER_PRESERVE 896 } 897 898 /* 899 * Recv initialization for opmode change. 900 */ 901 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv) 902 { 903 struct ath_hw *ah = priv->ah; 904 u32 rfilt, mfilt[2]; 905 906 /* configure rx filter */ 907 rfilt = ath9k_htc_calcrxfilter(priv); 908 ath9k_hw_setrxfilter(ah, rfilt); 909 910 /* calculate and install multicast filter */ 911 mfilt[0] = mfilt[1] = ~0; 912 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); 913 } 914 915 void ath9k_host_rx_init(struct ath9k_htc_priv *priv) 916 { 917 ath9k_hw_rxena(priv->ah); 918 ath9k_htc_opmode_init(priv); 919 ath9k_hw_startpcureceive(priv->ah, test_bit(OP_SCANNING, &priv->op_flags)); 920 priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER; 921 } 922 923 static void ath9k_process_rate(struct ieee80211_hw *hw, 924 struct ieee80211_rx_status *rxs, 925 u8 rx_rate, u8 rs_flags) 926 { 927 struct ieee80211_supported_band *sband; 928 enum ieee80211_band band; 929 unsigned int i = 0; 930 931 if (rx_rate & 0x80) { 932 /* HT rate */ 933 rxs->flag |= RX_FLAG_HT; 934 if (rs_flags & ATH9K_RX_2040) 935 rxs->flag |= RX_FLAG_40MHZ; 936 if (rs_flags & ATH9K_RX_GI) 937 rxs->flag |= RX_FLAG_SHORT_GI; 938 rxs->rate_idx = rx_rate & 0x7f; 939 return; 940 } 941 942 band = hw->conf.chandef.chan->band; 943 sband = hw->wiphy->bands[band]; 944 945 for (i = 0; i < sband->n_bitrates; i++) { 946 if (sband->bitrates[i].hw_value == rx_rate) { 947 rxs->rate_idx = i; 948 return; 949 } 950 if (sband->bitrates[i].hw_value_short == rx_rate) { 951 rxs->rate_idx = i; 952 rxs->flag |= RX_FLAG_SHORTPRE; 953 return; 954 } 955 } 956 957 } 958 959 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv, 960 struct ath9k_htc_rxbuf *rxbuf, 961 struct ieee80211_rx_status *rx_status) 962 963 { 964 struct ieee80211_hdr *hdr; 965 struct ieee80211_hw *hw = priv->hw; 966 struct sk_buff *skb = rxbuf->skb; 967 struct ath_common *common = ath9k_hw_common(priv->ah); 968 struct ath_htc_rx_status *rxstatus; 969 int hdrlen, padsize; 970 int last_rssi = ATH_RSSI_DUMMY_MARKER; 971 __le16 fc; 972 973 if (skb->len < HTC_RX_FRAME_HEADER_SIZE) { 974 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n", 975 skb->len); 976 goto rx_next; 977 } 978 979 rxstatus = (struct ath_htc_rx_status *)skb->data; 980 981 if (be16_to_cpu(rxstatus->rs_datalen) - 982 (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) { 983 ath_err(common, 984 "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n", 985 rxstatus->rs_datalen, skb->len); 986 goto rx_next; 987 } 988 989 ath9k_htc_err_stat_rx(priv, rxstatus); 990 991 /* Get the RX status information */ 992 memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE); 993 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE); 994 995 hdr = (struct ieee80211_hdr *)skb->data; 996 fc = hdr->frame_control; 997 hdrlen = ieee80211_get_hdrlen_from_skb(skb); 998 999 padsize = hdrlen & 3; 1000 if (padsize && skb->len >= hdrlen+padsize+FCS_LEN) { 1001 memmove(skb->data + padsize, skb->data, hdrlen); 1002 skb_pull(skb, padsize); 1003 } 1004 1005 memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); 1006 1007 if (rxbuf->rxstatus.rs_status != 0) { 1008 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC) 1009 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 1010 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY) 1011 goto rx_next; 1012 1013 if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) { 1014 /* FIXME */ 1015 } else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) { 1016 if (ieee80211_is_ctl(fc)) 1017 /* 1018 * Sometimes, we get invalid 1019 * MIC failures on valid control frames. 1020 * Remove these mic errors. 1021 */ 1022 rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC; 1023 else 1024 rx_status->flag |= RX_FLAG_MMIC_ERROR; 1025 } 1026 1027 /* 1028 * Reject error frames with the exception of 1029 * decryption and MIC failures. For monitor mode, 1030 * we also ignore the CRC error. 1031 */ 1032 if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) { 1033 if (rxbuf->rxstatus.rs_status & 1034 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | 1035 ATH9K_RXERR_CRC)) 1036 goto rx_next; 1037 } else { 1038 if (rxbuf->rxstatus.rs_status & 1039 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { 1040 goto rx_next; 1041 } 1042 } 1043 } 1044 1045 if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) { 1046 u8 keyix; 1047 keyix = rxbuf->rxstatus.rs_keyix; 1048 if (keyix != ATH9K_RXKEYIX_INVALID) { 1049 rx_status->flag |= RX_FLAG_DECRYPTED; 1050 } else if (ieee80211_has_protected(fc) && 1051 skb->len >= hdrlen + 4) { 1052 keyix = skb->data[hdrlen + 3] >> 6; 1053 if (test_bit(keyix, common->keymap)) 1054 rx_status->flag |= RX_FLAG_DECRYPTED; 1055 } 1056 } 1057 1058 ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate, 1059 rxbuf->rxstatus.rs_flags); 1060 1061 if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD && 1062 !rxbuf->rxstatus.rs_moreaggr) 1063 ATH_RSSI_LPF(priv->rx.last_rssi, 1064 rxbuf->rxstatus.rs_rssi); 1065 1066 last_rssi = priv->rx.last_rssi; 1067 1068 if (ieee80211_is_beacon(hdr->frame_control) && 1069 !is_zero_ether_addr(common->curbssid) && 1070 ether_addr_equal(hdr->addr3, common->curbssid)) { 1071 s8 rssi = rxbuf->rxstatus.rs_rssi; 1072 1073 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER)) 1074 rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER); 1075 1076 if (rssi < 0) 1077 rssi = 0; 1078 1079 priv->ah->stats.avgbrssi = rssi; 1080 } 1081 1082 rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp); 1083 rx_status->band = hw->conf.chandef.chan->band; 1084 rx_status->freq = hw->conf.chandef.chan->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_END; 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, ANY, "No free RX buffer\n"); 1171 goto err; 1172 } 1173 1174 spin_lock(&priv->rx.rxbuflock); 1175 rxbuf->skb = skb; 1176 rxbuf->in_process = true; 1177 spin_unlock(&priv->rx.rxbuflock); 1178 1179 tasklet_schedule(&priv->rx_tasklet); 1180 return; 1181 err: 1182 dev_kfree_skb_any(skb); 1183 } 1184 1185 /* FIXME: Locking for cleanup/init */ 1186 1187 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv) 1188 { 1189 struct ath9k_htc_rxbuf *rxbuf, *tbuf; 1190 1191 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) { 1192 list_del(&rxbuf->list); 1193 if (rxbuf->skb) 1194 dev_kfree_skb_any(rxbuf->skb); 1195 kfree(rxbuf); 1196 } 1197 } 1198 1199 int ath9k_rx_init(struct ath9k_htc_priv *priv) 1200 { 1201 int i = 0; 1202 1203 INIT_LIST_HEAD(&priv->rx.rxbuf); 1204 spin_lock_init(&priv->rx.rxbuflock); 1205 1206 for (i = 0; i < ATH9K_HTC_RXBUF; i++) { 1207 struct ath9k_htc_rxbuf *rxbuf = 1208 kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL); 1209 if (rxbuf == NULL) 1210 goto err; 1211 1212 list_add_tail(&rxbuf->list, &priv->rx.rxbuf); 1213 } 1214 1215 return 0; 1216 1217 err: 1218 ath9k_rx_cleanup(priv); 1219 return -ENOMEM; 1220 } 1221