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