drivers/net/wireless/ti/wlcore/tx.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/etherdevice.h>
  27
  28 #include "wlcore.h"
  29 #include "debug.h"
  30 #include "io.h"
  31 #include "ps.h"
  32 #include "tx.h"
  33 #include "event.h"
  34 #include "hw_ops.h"
  35
  36 /*
  37  * TODO: this is here just for now, it must be removed when the data
  38  * operations are in place.
  39  */
  40 #include "../wl12xx/reg.h"
  41
  42 static int wl1271_set_default_wep_key(struct wl1271 *wl,
  43                                       struct wl12xx_vif *wlvif, u8 id)
  44 {
  45         int ret;
  46         bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
  47
  48         if (is_ap)
  49                 ret = wl12xx_cmd_set_default_wep_key(wl, id,
  50                                                      wlvif->ap.bcast_hlid);
  51         else
  52                 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
  53
  54         if (ret < 0)
  55                 return ret;
  56
  57         wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
  58         return 0;
  59 }
  60
  61 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
  62 {
  63         int id;
  64
  65         id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
  66         if (id >= wl->num_tx_desc)
  67                 return -EBUSY;
  68
  69         __set_bit(id, wl->tx_frames_map);
  70         wl->tx_frames[id] = skb;
  71         wl->tx_frames_cnt++;
  72         return id;
  73 }
  74
  75 void wl1271_free_tx_id(struct wl1271 *wl, int id)
  76 {
  77         if (__test_and_clear_bit(id, wl->tx_frames_map)) {
  78                 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
  79                         clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
  80
  81                 wl->tx_frames[id] = NULL;
  82                 wl->tx_frames_cnt--;
  83         }
  84 }
  85 EXPORT_SYMBOL(wl1271_free_tx_id);
  86
  87 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  88                                                  struct sk_buff *skb)
  89 {
  90         struct ieee80211_hdr *hdr;
  91
  92         /*
  93          * add the station to the known list before transmitting the
  94          * authentication response. this way it won't get de-authed by FW
  95          * when transmitting too soon.
  96          */
  97         hdr = (struct ieee80211_hdr *)(skb->data +
  98                                        sizeof(struct wl1271_tx_hw_descr));
  99         if (ieee80211_is_auth(hdr->frame_control))
 100                 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
 101 }
 102
 103 static void wl1271_tx_regulate_link(struct wl1271 *wl,
 104                                     struct wl12xx_vif *wlvif,
 105                                     u8 hlid)
 106 {
 107         bool fw_ps, single_sta;
 108         u8 tx_pkts;
 109
 110         if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
 111                 return;
 112
 113         fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
 114         tx_pkts = wl->links[hlid].allocated_pkts;
 115         single_sta = (wl->active_sta_count == 1);
 116
 117         /*
 118          * if in FW PS and there is enough data in FW we can put the link
 119          * into high-level PS and clean out its TX queues.
 120          * Make an exception if this is the only connected station. In this
 121          * case FW-memory congestion is not a problem.
 122          */
 123         if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 124                 wl12xx_ps_link_start(wl, wlvif, hlid, true);
 125 }
 126
 127 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
 128 {
 129         return wl->dummy_packet == skb;
 130 }
 131 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
 132
 133 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 134                                 struct sk_buff *skb, struct ieee80211_sta *sta)
 135 {
 136         if (sta) {
 137                 struct wl1271_station *wl_sta;
 138
 139                 wl_sta = (struct wl1271_station *)sta->drv_priv;
 140                 return wl_sta->hlid;
 141         } else {
 142                 struct ieee80211_hdr *hdr;
 143
 144                 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
 145                         return wl->system_hlid;
 146
 147                 hdr = (struct ieee80211_hdr *)skb->data;
 148                 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 149                         return wlvif->ap.bcast_hlid;
 150                 else
 151                         return wlvif->ap.global_hlid;
 152         }
 153 }
 154
 155 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 156                       struct sk_buff *skb, struct ieee80211_sta *sta)
 157 {
 158         struct ieee80211_tx_info *control;
 159
 160         if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
 161                 return wl->system_hlid;
 162
 163         if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 164                 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
 165
 166         control = IEEE80211_SKB_CB(skb);
 167         if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
 168                 wl1271_debug(DEBUG_TX, "tx offchannel");
 169                 return wlvif->dev_hlid;
 170         }
 171
 172         return wlvif->sta.hlid;
 173 }
 174
 175 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
 176                                           unsigned int packet_length)
 177 {
 178         if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
 179             !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
 180                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 181         else
 182                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 183 }
 184 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 185
 186 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 187                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 188                               u8 hlid, bool is_gem)
 189 {
 190         struct wl1271_tx_hw_descr *desc;
 191         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 192         u32 total_blocks;
 193         int id, ret = -EBUSY, ac;
 194         u32 spare_blocks;
 195
 196         if (buf_offset + total_len > wl->aggr_buf_size)
 197                 return -EAGAIN;
 198
 199         spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
 200
 201         /* allocate free identifier for the packet */
 202         id = wl1271_alloc_tx_id(wl, skb);
 203         if (id < 0)
 204                 return id;
 205
 206         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 207
 208         if (total_blocks <= wl->tx_blocks_available) {
 209                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 210                         skb, total_len - skb->len);
 211
 212                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 213                                              spare_blocks);
 214
 215                 desc->id = id;
 216
 217                 wl->tx_blocks_available -= total_blocks;
 218                 wl->tx_allocated_blocks += total_blocks;
 219
 220                 /* If the FW was empty before, arm the Tx watchdog */
 221                 if (wl->tx_allocated_blocks == total_blocks)
 222                         wl12xx_rearm_tx_watchdog_locked(wl);
 223
 224                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 225                 wl->tx_allocated_pkts[ac]++;
 226
 227                 if (!wl12xx_is_dummy_packet(wl, skb) && wlvif &&
 228                     wlvif->bss_type == BSS_TYPE_AP_BSS &&
 229                     test_bit(hlid, wlvif->ap.sta_hlid_map))
 230                         wl->links[hlid].allocated_pkts++;
 231
 232                 ret = 0;
 233
 234                 wl1271_debug(DEBUG_TX,
 235                              "tx_allocate: size: %d, blocks: %d, id: %d",
 236                              total_len, total_blocks, id);
 237         } else {
 238                 wl1271_free_tx_id(wl, id);
 239         }
 240
 241         return ret;
 242 }
 243
 244 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 245                                struct sk_buff *skb, u32 extra,
 246                                struct ieee80211_tx_info *control, u8 hlid)
 247 {
 248         struct timespec ts;
 249         struct wl1271_tx_hw_descr *desc;
 250         int ac, rate_idx;
 251         s64 hosttime;
 252         u16 tx_attr = 0;
 253         __le16 frame_control;
 254         struct ieee80211_hdr *hdr;
 255         u8 *frame_start;
 256         bool is_dummy;
 257
 258         desc = (struct wl1271_tx_hw_descr *) skb->data;
 259         frame_start = (u8 *)(desc + 1);
 260         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 261         frame_control = hdr->frame_control;
 262
 263         /* relocate space for security header */
 264         if (extra) {
 265                 int hdrlen = ieee80211_hdrlen(frame_control);
 266                 memmove(frame_start, hdr, hdrlen);
 267                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 268         }
 269
 270         /* configure packet life time */
 271         getnstimeofday(&ts);
 272         hosttime = (timespec_to_ns(&ts) >> 10);
 273         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 274
 275         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 276         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 277                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 278         else
 279                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 280
 281         /* queue */
 282         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 283         desc->tid = skb->priority;
 284
 285         if (is_dummy) {
 286                 /*
 287                  * FW expects the dummy packet to have an invalid session id -
 288                  * any session id that is different than the one set in the join
 289                  */
 290                 tx_attr = (SESSION_COUNTER_INVALID <<
 291                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 292                            TX_HW_ATTR_SESSION_COUNTER;
 293
 294                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 295         } else if (wlvif) {
 296                 /* configure the tx attributes */
 297                 tx_attr = wlvif->session_counter <<
 298                           TX_HW_ATTR_OFST_SESSION_COUNTER;
 299         }
 300
 301         desc->hlid = hlid;
 302         if (is_dummy || !wlvif)
 303                 rate_idx = 0;
 304         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 305                 /*
 306                  * if the packets are data packets
 307                  * send them with AP rate policies (EAPOLs are an exception),
 308                  * otherwise use default basic rates
 309                  */
 310                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 311                         rate_idx = wlvif->sta.basic_rate_idx;
 312                 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 313                         rate_idx = wlvif->sta.p2p_rate_idx;
 314                 else if (ieee80211_is_data(frame_control))
 315                         rate_idx = wlvif->sta.ap_rate_idx;
 316                 else
 317                         rate_idx = wlvif->sta.basic_rate_idx;
 318         } else {
 319                 if (hlid == wlvif->ap.global_hlid)
 320                         rate_idx = wlvif->ap.mgmt_rate_idx;
 321                 else if (hlid == wlvif->ap.bcast_hlid ||
 322                          skb->protocol == cpu_to_be16(ETH_P_PAE) ||
 323                          !ieee80211_is_data(frame_control))
 324                         /*
 325                          * send non-data, bcast and EAPOLs using the
 326                          * min basic rate
 327                          */
 328                         rate_idx = wlvif->ap.bcast_rate_idx;
 329                 else
 330                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 331         }
 332
 333         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 334
 335         /* for WEP shared auth - no fw encryption is needed */
 336         if (ieee80211_is_auth(frame_control) &&
 337             ieee80211_has_protected(frame_control))
 338                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 339
 340         desc->tx_attr = cpu_to_le16(tx_attr);
 341
 342         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 343         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 344 }
 345
 346 /* caller must hold wl->mutex */
 347 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 348                                    struct sk_buff *skb, u32 buf_offset, u8 hlid)
 349 {
 350         struct ieee80211_tx_info *info;
 351         u32 extra = 0;
 352         int ret = 0;
 353         u32 total_len;
 354         bool is_dummy;
 355         bool is_gem = false;
 356
 357         if (!skb) {
 358                 wl1271_error("discarding null skb");
 359                 return -EINVAL;
 360         }
 361
 362         if (hlid == WL12XX_INVALID_LINK_ID) {
 363                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 364                 return -EINVAL;
 365         }
 366
 367         info = IEEE80211_SKB_CB(skb);
 368
 369         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 370
 371         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 372             info->control.hw_key &&
 373             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 374                 extra = WL1271_EXTRA_SPACE_TKIP;
 375
 376         if (info->control.hw_key) {
 377                 bool is_wep;
 378                 u8 idx = info->control.hw_key->hw_key_idx;
 379                 u32 cipher = info->control.hw_key->cipher;
 380
 381                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 382                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 383
 384                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 385                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 386                         if (ret < 0)
 387                                 return ret;
 388                         wlvif->default_key = idx;
 389                 }
 390
 391                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 392         }
 393
 394         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 395                                  is_gem);
 396         if (ret < 0)
 397                 return ret;
 398
 399         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 400
 401         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 402                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 403                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 404         }
 405
 406         /*
 407          * The length of each packet is stored in terms of
 408          * words. Thus, we must pad the skb data to make sure its
 409          * length is aligned.  The number of padding bytes is computed
 410          * and set in wl1271_tx_fill_hdr.
 411          * In special cases, we want to align to a specific block size
 412          * (eg. for wl128x with SDIO we align to 256).
 413          */
 414         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 415
 416         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 417         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 418
 419         /* Revert side effects in the dummy packet skb, so it can be reused */
 420         if (is_dummy)
 421                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 422
 423         return total_len;
 424 }
 425
 426 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 427                                 enum ieee80211_band rate_band)
 428 {
 429         struct ieee80211_supported_band *band;
 430         u32 enabled_rates = 0;
 431         int bit;
 432
 433         band = wl->hw->wiphy->bands[rate_band];
 434         for (bit = 0; bit < band->n_bitrates; bit++) {
 435                 if (rate_set & 0x1)
 436                         enabled_rates |= band->bitrates[bit].hw_value;
 437                 rate_set >>= 1;
 438         }
 439
 440         /* MCS rates indication are on bits 16 - 31 */
 441         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 442
 443         for (bit = 0; bit < 16; bit++) {
 444                 if (rate_set & 0x1)
 445                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 446                 rate_set >>= 1;
 447         }
 448
 449         return enabled_rates;
 450 }
 451
 452 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 453 {
 454         int i;
 455
 456         for (i = 0; i < NUM_TX_QUEUES; i++) {
 457                 if (wlcore_is_queue_stopped_by_reason(wl, i,
 458                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 459                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 460                         /* firmware buffer has space, restart queues */
 461                         wlcore_wake_queue(wl, i,
 462                                           WLCORE_QUEUE_STOP_REASON_WATERMARK);
 463                 }
 464         }
 465 }
 466
 467 static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
 468                                                 struct sk_buff_head *queues)
 469 {
 470         int i, q = -1, ac;
 471         u32 min_pkts = 0xffffffff;
 472
 473         /*
 474          * Find a non-empty ac where:
 475          * 1. There are packets to transmit
 476          * 2. The FW has the least allocated blocks
 477          *
 478          * We prioritize the ACs according to VO>VI>BE>BK
 479          */
 480         for (i = 0; i < NUM_TX_QUEUES; i++) {
 481                 ac = wl1271_tx_get_queue(i);
 482                 if (!skb_queue_empty(&queues[ac]) &&
 483                     (wl->tx_allocated_pkts[ac] < min_pkts)) {
 484                         q = ac;
 485                         min_pkts = wl->tx_allocated_pkts[q];
 486                 }
 487         }
 488
 489         if (q == -1)
 490                 return NULL;
 491
 492         return &queues[q];
 493 }
 494
 495 static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
 496                                               struct wl1271_link *lnk)
 497 {
 498         struct sk_buff *skb;
 499         unsigned long flags;
 500         struct sk_buff_head *queue;
 501
 502         queue = wl1271_select_queue(wl, lnk->tx_queue);
 503         if (!queue)
 504                 return NULL;
 505
 506         skb = skb_dequeue(queue);
 507         if (skb) {
 508                 int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 509                 spin_lock_irqsave(&wl->wl_lock, flags);
 510                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 511                 wl->tx_queue_count[q]--;
 512                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 513         }
 514
 515         return skb;
 516 }
 517
 518 static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
 519                                               struct wl12xx_vif *wlvif,
 520                                               u8 *hlid)
 521 {
 522         struct sk_buff *skb = NULL;
 523         int i, h, start_hlid;
 524
 525         /* start from the link after the last one */
 526         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 527
 528         /* dequeue according to AC, round robin on each link */
 529         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 530                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 531
 532                 /* only consider connected stations */
 533                 if (!test_bit(h, wlvif->links_map))
 534                         continue;
 535
 536                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
 537                 if (!skb)
 538                         continue;
 539
 540                 wlvif->last_tx_hlid = h;
 541                 break;
 542         }
 543
 544         if (!skb)
 545                 wlvif->last_tx_hlid = 0;
 546
 547         *hlid = wlvif->last_tx_hlid;
 548         return skb;
 549 }
 550
 551 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
 552 {
 553         unsigned long flags;
 554         struct wl12xx_vif *wlvif = wl->last_wlvif;
 555         struct sk_buff *skb = NULL;
 556
 557         /* continue from last wlvif (round robin) */
 558         if (wlvif) {
 559                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 560                         skb = wl12xx_vif_skb_dequeue(wl, wlvif, hlid);
 561                         if (skb) {
 562                                 wl->last_wlvif = wlvif;
 563                                 break;
 564                         }
 565                 }
 566         }
 567
 568         /* dequeue from the system HLID before the restarting wlvif list */
 569         if (!skb) {
 570                 skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
 571                 *hlid = wl->system_hlid;
 572         }
 573
 574         /* do a new pass over the wlvif list */
 575         if (!skb) {
 576                 wl12xx_for_each_wlvif(wl, wlvif) {
 577                         skb = wl12xx_vif_skb_dequeue(wl, wlvif, hlid);
 578                         if (skb) {
 579                                 wl->last_wlvif = wlvif;
 580                                 break;
 581                         }
 582
 583                         /*
 584                          * No need to continue after last_wlvif. The previous
 585                          * pass should have found it.
 586                          */
 587                         if (wlvif == wl->last_wlvif)
 588                                 break;
 589                 }
 590         }
 591
 592         if (!skb &&
 593             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 594                 int q;
 595
 596                 skb = wl->dummy_packet;
 597                 *hlid = wl->system_hlid;
 598                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 599                 spin_lock_irqsave(&wl->wl_lock, flags);
 600                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 601                 wl->tx_queue_count[q]--;
 602                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 603         }
 604
 605         return skb;
 606 }
 607
 608 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 609                                   struct sk_buff *skb, u8 hlid)
 610 {
 611         unsigned long flags;
 612         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 613
 614         if (wl12xx_is_dummy_packet(wl, skb)) {
 615                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 616         } else {
 617                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 618
 619                 /* make sure we dequeue the same packet next time */
 620                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 621                                       WL12XX_MAX_LINKS;
 622         }
 623
 624         spin_lock_irqsave(&wl->wl_lock, flags);
 625         wl->tx_queue_count[q]++;
 626         spin_unlock_irqrestore(&wl->wl_lock, flags);
 627 }
 628
 629 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 630 {
 631         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 632
 633         return ieee80211_is_data_present(hdr->frame_control);
 634 }
 635
 636 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 637 {
 638         struct wl12xx_vif *wlvif;
 639         u32 timeout;
 640         u8 hlid;
 641
 642         if (!wl->conf.rx_streaming.interval)
 643                 return;
 644
 645         if (!wl->conf.rx_streaming.always &&
 646             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 647                 return;
 648
 649         timeout = wl->conf.rx_streaming.duration;
 650         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 651                 bool found = false;
 652                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 653                         if (test_bit(hlid, wlvif->links_map)) {
 654                                 found  = true;
 655                                 break;
 656                         }
 657                 }
 658
 659                 if (!found)
 660                         continue;
 661
 662                 /* enable rx streaming */
 663                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 664                         ieee80211_queue_work(wl->hw,
 665                                              &wlvif->rx_streaming_enable_work);
 666
 667                 mod_timer(&wlvif->rx_streaming_timer,
 668                           jiffies + msecs_to_jiffies(timeout));
 669         }
 670 }
 671
 672 /*
 673  * Returns failure values only in case of failed bus ops within this function.
 674  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
 675  * triggering recovery by higher layers when not necessary.
 676  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
 677  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
 678  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
 679  * within prepare_tx_frame code but there's nothing we should do about those
 680  * as well.
 681  */
 682 int wlcore_tx_work_locked(struct wl1271 *wl)
 683 {
 684         struct wl12xx_vif *wlvif;
 685         struct sk_buff *skb;
 686         struct wl1271_tx_hw_descr *desc;
 687         u32 buf_offset = 0, last_len = 0;
 688         bool sent_packets = false;
 689         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 690         int ret = 0;
 691         int bus_ret = 0;
 692         u8 hlid;
 693
 694         if (unlikely(wl->state != WLCORE_STATE_ON))
 695                 return 0;
 696
 697         while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
 698                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 699                 bool has_data = false;
 700
 701                 wlvif = NULL;
 702                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 703                         wlvif = wl12xx_vif_to_data(info->control.vif);
 704                 else
 705                         hlid = wl->system_hlid;
 706
 707                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 708                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
 709                                               hlid);
 710                 if (ret == -EAGAIN) {
 711                         /*
 712                          * Aggregation buffer is full.
 713                          * Flush buffer and try again.
 714                          */
 715                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 716
 717                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 718                                                             last_len);
 719                         bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
 720                                              wl->aggr_buf, buf_offset, true);
 721                         if (bus_ret < 0)
 722                                 goto out;
 723
 724                         sent_packets = true;
 725                         buf_offset = 0;
 726                         continue;
 727                 } else if (ret == -EBUSY) {
 728                         /*
 729                          * Firmware buffer is full.
 730                          * Queue back last skb, and stop aggregating.
 731                          */
 732                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 733                         /* No work left, avoid scheduling redundant tx work */
 734                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 735                         goto out_ack;
 736                 } else if (ret < 0) {
 737                         if (wl12xx_is_dummy_packet(wl, skb))
 738                                 /*
 739                                  * fw still expects dummy packet,
 740                                  * so re-enqueue it
 741                                  */
 742                                 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 743                         else
 744                                 ieee80211_free_txskb(wl->hw, skb);
 745                         goto out_ack;
 746                 }
 747                 last_len = ret;
 748                 buf_offset += last_len;
 749                 wl->tx_packets_count++;
 750                 if (has_data) {
 751                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 752                         __set_bit(desc->hlid, active_hlids);
 753                 }
 754         }
 755
 756 out_ack:
 757         if (buf_offset) {
 758                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 759                 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 760                                              buf_offset, true);
 761                 if (bus_ret < 0)
 762                         goto out;
 763
 764                 sent_packets = true;
 765         }
 766         if (sent_packets) {
 767                 /*
 768                  * Interrupt the firmware with the new packets. This is only
 769                  * required for older hardware revisions
 770                  */
 771                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 772                         bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
 773                                              wl->tx_packets_count);
 774                         if (bus_ret < 0)
 775                                 goto out;
 776                 }
 777
 778                 wl1271_handle_tx_low_watermark(wl);
 779         }
 780         wl12xx_rearm_rx_streaming(wl, active_hlids);
 781
 782 out:
 783         return bus_ret;
 784 }
 785
 786 void wl1271_tx_work(struct work_struct *work)
 787 {
 788         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 789         int ret;
 790
 791         mutex_lock(&wl->mutex);
 792         ret = wl1271_ps_elp_wakeup(wl);
 793         if (ret < 0)
 794                 goto out;
 795
 796         ret = wlcore_tx_work_locked(wl);
 797         if (ret < 0) {
 798                 wl12xx_queue_recovery_work(wl);
 799                 goto out;
 800         }
 801
 802         wl1271_ps_elp_sleep(wl);
 803 out:
 804         mutex_unlock(&wl->mutex);
 805 }
 806
 807 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 808 {
 809         u8 flags = 0;
 810
 811         /*
 812          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 813          * only it uses Tx-completion.
 814          */
 815         if (rate_class_index <= 8)
 816                 flags |= IEEE80211_TX_RC_MCS;
 817
 818         /*
 819          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 820          * only it uses Tx-completion.
 821          */
 822         if (rate_class_index == 0)
 823                 flags |= IEEE80211_TX_RC_SHORT_GI;
 824
 825         return flags;
 826 }
 827
 828 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 829                                       struct wl1271_tx_hw_res_descr *result)
 830 {
 831         struct ieee80211_tx_info *info;
 832         struct ieee80211_vif *vif;
 833         struct wl12xx_vif *wlvif;
 834         struct sk_buff *skb;
 835         int id = result->id;
 836         int rate = -1;
 837         u8 rate_flags = 0;
 838         u8 retries = 0;
 839
 840         /* check for id legality */
 841         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 842                 wl1271_warning("TX result illegal id: %d", id);
 843                 return;
 844         }
 845
 846         skb = wl->tx_frames[id];
 847         info = IEEE80211_SKB_CB(skb);
 848
 849         if (wl12xx_is_dummy_packet(wl, skb)) {
 850                 wl1271_free_tx_id(wl, id);
 851                 return;
 852         }
 853
 854         /* info->control is valid as long as we don't update info->status */
 855         vif = info->control.vif;
 856         wlvif = wl12xx_vif_to_data(vif);
 857
 858         /* update the TX status info */
 859         if (result->status == TX_SUCCESS) {
 860                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 861                         info->flags |= IEEE80211_TX_STAT_ACK;
 862                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 863                                           wlvif->band);
 864                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 865                 retries = result->ack_failures;
 866         } else if (result->status == TX_RETRY_EXCEEDED) {
 867                 wl->stats.excessive_retries++;
 868                 retries = result->ack_failures;
 869         }
 870
 871         info->status.rates[0].idx = rate;
 872         info->status.rates[0].count = retries;
 873         info->status.rates[0].flags = rate_flags;
 874         info->status.ack_signal = -1;
 875
 876         wl->stats.retry_count += result->ack_failures;
 877
 878         /*
 879          * update sequence number only when relevant, i.e. only in
 880          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 881          */
 882         if (info->control.hw_key &&
 883             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 884              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 885              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 886                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 887                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 888
 889                 /*
 890                  * update security sequence number, taking care of potential
 891                  * wrap-around
 892                  */
 893                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 894                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 895         }
 896
 897         /* remove private header from packet */
 898         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 899
 900         /* remove TKIP header space if present */
 901         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 902             info->control.hw_key &&
 903             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 904                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 905                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 906                         hdrlen);
 907                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 908         }
 909
 910         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 911                      " status 0x%x",
 912                      result->id, skb, result->ack_failures,
 913                      result->rate_class_index, result->status);
 914
 915         /* return the packet to the stack */
 916         skb_queue_tail(&wl->deferred_tx_queue, skb);
 917         queue_work(wl->freezable_wq, &wl->netstack_work);
 918         wl1271_free_tx_id(wl, result->id);
 919 }
 920
 921 /* Called upon reception of a TX complete interrupt */
 922 int wlcore_tx_complete(struct wl1271 *wl)
 923 {
 924         struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
 925         u32 count, fw_counter;
 926         u32 i;
 927         int ret;
 928
 929         /* read the tx results from the chipset */
 930         ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
 931                           wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 932         if (ret < 0)
 933                 goto out;
 934
 935         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 936
 937         /* write host counter to chipset (to ack) */
 938         ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
 939                              offsetof(struct wl1271_tx_hw_res_if,
 940                                       tx_result_host_counter), fw_counter);
 941         if (ret < 0)
 942                 goto out;
 943
 944         count = fw_counter - wl->tx_results_count;
 945         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 946
 947         /* verify that the result buffer is not getting overrun */
 948         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 949                 wl1271_warning("TX result overflow from chipset: %d", count);
 950
 951         /* process the results */
 952         for (i = 0; i < count; i++) {
 953                 struct wl1271_tx_hw_res_descr *result;
 954                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 955
 956                 /* process the packet */
 957                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 958                 wl1271_tx_complete_packet(wl, result);
 959
 960                 wl->tx_results_count++;
 961         }
 962
 963 out:
 964         return ret;
 965 }
 966 EXPORT_SYMBOL(wlcore_tx_complete);
 967
 968 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 969 {
 970         struct sk_buff *skb;
 971         int i;
 972         unsigned long flags;
 973         struct ieee80211_tx_info *info;
 974         int total[NUM_TX_QUEUES];
 975
 976         for (i = 0; i < NUM_TX_QUEUES; i++) {
 977                 total[i] = 0;
 978                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 979                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 980
 981                         if (!wl12xx_is_dummy_packet(wl, skb)) {
 982                                 info = IEEE80211_SKB_CB(skb);
 983                                 info->status.rates[0].idx = -1;
 984                                 info->status.rates[0].count = 0;
 985                                 ieee80211_tx_status_ni(wl->hw, skb);
 986                         }
 987
 988                         total[i]++;
 989                 }
 990         }
 991
 992         spin_lock_irqsave(&wl->wl_lock, flags);
 993         for (i = 0; i < NUM_TX_QUEUES; i++)
 994                 wl->tx_queue_count[i] -= total[i];
 995         spin_unlock_irqrestore(&wl->wl_lock, flags);
 996
 997         wl1271_handle_tx_low_watermark(wl);
 998 }
 999
1000 /* caller must hold wl->mutex and TX must be stopped */
1001 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1002 {
1003         int i;
1004
1005         /* TX failure */
1006         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1007                 if (wlvif->bss_type == BSS_TYPE_AP_BSS)
1008                         wl1271_free_sta(wl, wlvif, i);
1009                 else
1010                         wlvif->sta.ba_rx_bitmap = 0;
1011
1012                 wl->links[i].allocated_pkts = 0;
1013                 wl->links[i].prev_freed_pkts = 0;
1014         }
1015         wlvif->last_tx_hlid = 0;
1016
1017 }
1018 /* caller must hold wl->mutex and TX must be stopped */
1019 void wl12xx_tx_reset(struct wl1271 *wl)
1020 {
1021         int i;
1022         struct sk_buff *skb;
1023         struct ieee80211_tx_info *info;
1024
1025         /* only reset the queues if something bad happened */
1026         if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
1027                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1028                         wl1271_tx_reset_link_queues(wl, i);
1029
1030                 for (i = 0; i < NUM_TX_QUEUES; i++)
1031                         wl->tx_queue_count[i] = 0;
1032         }
1033
1034         /*
1035          * Make sure the driver is at a consistent state, in case this
1036          * function is called from a context other than interface removal.
1037          * This call will always wake the TX queues.
1038          */
1039         wl1271_handle_tx_low_watermark(wl);
1040
1041         for (i = 0; i < wl->num_tx_desc; i++) {
1042                 if (wl->tx_frames[i] == NULL)
1043                         continue;
1044
1045                 skb = wl->tx_frames[i];
1046                 wl1271_free_tx_id(wl, i);
1047                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1048
1049                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1050                         /*
1051                          * Remove private headers before passing the skb to
1052                          * mac80211
1053                          */
1054                         info = IEEE80211_SKB_CB(skb);
1055                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1056                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1057                             info->control.hw_key &&
1058                             info->control.hw_key->cipher ==
1059                             WLAN_CIPHER_SUITE_TKIP) {
1060                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1061                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1062                                         skb->data, hdrlen);
1063                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1064                         }
1065
1066                         info->status.rates[0].idx = -1;
1067                         info->status.rates[0].count = 0;
1068
1069                         ieee80211_tx_status_ni(wl->hw, skb);
1070                 }
1071         }
1072 }
1073
1074 #define WL1271_TX_FLUSH_TIMEOUT 500000
1075
1076 /* caller must *NOT* hold wl->mutex */
1077 void wl1271_tx_flush(struct wl1271 *wl)
1078 {
1079         unsigned long timeout, start_time;
1080         int i;
1081         start_time = jiffies;
1082         timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1083
1084         /* only one flush should be in progress, for consistent queue state */
1085         mutex_lock(&wl->flush_mutex);
1086
1087         mutex_lock(&wl->mutex);
1088         if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1089                 mutex_unlock(&wl->mutex);
1090                 goto out;
1091         }
1092
1093         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1094
1095         while (!time_after(jiffies, timeout)) {
1096                 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1097                              wl->tx_frames_cnt,
1098                              wl1271_tx_total_queue_count(wl));
1099
1100                 /* force Tx and give the driver some time to flush data */
1101                 mutex_unlock(&wl->mutex);
1102                 if (wl1271_tx_total_queue_count(wl))
1103                         wl1271_tx_work(&wl->tx_work);
1104                 msleep(20);
1105                 mutex_lock(&wl->mutex);
1106
1107                 if ((wl->tx_frames_cnt == 0) &&
1108                     (wl1271_tx_total_queue_count(wl) == 0)) {
1109                         wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1110                                      jiffies_to_msecs(jiffies - start_time));
1111                         goto out_wake;
1112                 }
1113         }
1114
1115         wl1271_warning("Unable to flush all TX buffers, "
1116                        "timed out (timeout %d ms",
1117                        WL1271_TX_FLUSH_TIMEOUT / 1000);
1118
1119         /* forcibly flush all Tx buffers on our queues */
1120         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1121                 wl1271_tx_reset_link_queues(wl, i);
1122
1123 out_wake:
1124         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1125         mutex_unlock(&wl->mutex);
1126 out:
1127         mutex_unlock(&wl->flush_mutex);
1128 }
1129 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1130
1131 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1132 {
1133         if (WARN_ON(!rate_set))
1134                 return 0;
1135
1136         return BIT(__ffs(rate_set));
1137 }
1138
1139 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1140                               enum wlcore_queue_stop_reason reason)
1141 {
1142         bool stopped = !!wl->queue_stop_reasons[queue];
1143
1144         /* queue should not be stopped for this reason */
1145         WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1146
1147         if (stopped)
1148                 return;
1149
1150         ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1151 }
1152
1153 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1154                        enum wlcore_queue_stop_reason reason)
1155 {
1156         unsigned long flags;
1157
1158         spin_lock_irqsave(&wl->wl_lock, flags);
1159         wlcore_stop_queue_locked(wl, queue, reason);
1160         spin_unlock_irqrestore(&wl->wl_lock, flags);
1161 }
1162
1163 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1164                        enum wlcore_queue_stop_reason reason)
1165 {
1166         unsigned long flags;
1167
1168         spin_lock_irqsave(&wl->wl_lock, flags);
1169
1170         /* queue should not be clear for this reason */
1171         WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1172
1173         if (wl->queue_stop_reasons[queue])
1174                 goto out;
1175
1176         ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1177
1178 out:
1179         spin_unlock_irqrestore(&wl->wl_lock, flags);
1180 }
1181
1182 void wlcore_stop_queues(struct wl1271 *wl,
1183                         enum wlcore_queue_stop_reason reason)
1184 {
1185         int i;
1186
1187         for (i = 0; i < NUM_TX_QUEUES; i++)
1188                 wlcore_stop_queue(wl, i, reason);
1189 }
1190 EXPORT_SYMBOL_GPL(wlcore_stop_queues);
1191
1192 void wlcore_wake_queues(struct wl1271 *wl,
1193                         enum wlcore_queue_stop_reason reason)
1194 {
1195         int i;
1196
1197         for (i = 0; i < NUM_TX_QUEUES; i++)
1198                 wlcore_wake_queue(wl, i, reason);
1199 }
1200 EXPORT_SYMBOL_GPL(wlcore_wake_queues);
1201
1202 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1203 {
1204         int i;
1205         unsigned long flags;
1206
1207         spin_lock_irqsave(&wl->wl_lock, flags);
1208
1209         for (i = 0; i < NUM_TX_QUEUES; i++) {
1210                 if (!wl->queue_stop_reasons[i])
1211                         continue;
1212
1213                 wl->queue_stop_reasons[i] = 0;
1214                 ieee80211_wake_queue(wl->hw,
1215                                      wl1271_tx_get_mac80211_queue(i));
1216         }
1217
1218         spin_unlock_irqrestore(&wl->wl_lock, flags);
1219 }
1220
1221 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1222                              enum wlcore_queue_stop_reason reason)
1223 {
1224         return test_bit(reason, &wl->queue_stop_reasons[queue]);
1225 }
1226
1227 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1228 {
1229         return !!wl->queue_stop_reasons[queue];
1230 }