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 (test_bit(hlid, wl->links_map))
 228                         wl->links[hlid].allocated_pkts++;
 229
 230                 ret = 0;
 231
 232                 wl1271_debug(DEBUG_TX,
 233                              "tx_allocate: size: %d, blocks: %d, id: %d",
 234                              total_len, total_blocks, id);
 235         } else {
 236                 wl1271_free_tx_id(wl, id);
 237         }
 238
 239         return ret;
 240 }
 241
 242 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 243                                struct sk_buff *skb, u32 extra,
 244                                struct ieee80211_tx_info *control, u8 hlid)
 245 {
 246         struct timespec ts;
 247         struct wl1271_tx_hw_descr *desc;
 248         int ac, rate_idx;
 249         s64 hosttime;
 250         u16 tx_attr = 0;
 251         __le16 frame_control;
 252         struct ieee80211_hdr *hdr;
 253         u8 *frame_start;
 254         bool is_dummy;
 255
 256         desc = (struct wl1271_tx_hw_descr *) skb->data;
 257         frame_start = (u8 *)(desc + 1);
 258         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 259         frame_control = hdr->frame_control;
 260
 261         /* relocate space for security header */
 262         if (extra) {
 263                 int hdrlen = ieee80211_hdrlen(frame_control);
 264                 memmove(frame_start, hdr, hdrlen);
 265                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 266         }
 267
 268         /* configure packet life time */
 269         getnstimeofday(&ts);
 270         hosttime = (timespec_to_ns(&ts) >> 10);
 271         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 272
 273         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 274         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 275                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 276         else
 277                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 278
 279         /* queue */
 280         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 281         desc->tid = skb->priority;
 282
 283         if (is_dummy) {
 284                 /*
 285                  * FW expects the dummy packet to have an invalid session id -
 286                  * any session id that is different than the one set in the join
 287                  */
 288                 tx_attr = (SESSION_COUNTER_INVALID <<
 289                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 290                            TX_HW_ATTR_SESSION_COUNTER;
 291
 292                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 293         } else if (wlvif) {
 294                 u8 session_id = wl->session_ids[hlid];
 295
 296                 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
 297                     (wlvif->bss_type == BSS_TYPE_AP_BSS))
 298                         session_id = 0;
 299
 300                 /* configure the tx attributes */
 301                 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
 302         }
 303
 304         desc->hlid = hlid;
 305         if (is_dummy || !wlvif)
 306                 rate_idx = 0;
 307         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 308                 /*
 309                  * if the packets are data packets
 310                  * send them with AP rate policies (EAPOLs are an exception),
 311                  * otherwise use default basic rates
 312                  */
 313                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 314                         rate_idx = wlvif->sta.basic_rate_idx;
 315                 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 316                         rate_idx = wlvif->sta.p2p_rate_idx;
 317                 else if (ieee80211_is_data(frame_control))
 318                         rate_idx = wlvif->sta.ap_rate_idx;
 319                 else
 320                         rate_idx = wlvif->sta.basic_rate_idx;
 321         } else {
 322                 if (hlid == wlvif->ap.global_hlid)
 323                         rate_idx = wlvif->ap.mgmt_rate_idx;
 324                 else if (hlid == wlvif->ap.bcast_hlid ||
 325                          skb->protocol == cpu_to_be16(ETH_P_PAE) ||
 326                          !ieee80211_is_data(frame_control))
 327                         /*
 328                          * send non-data, bcast and EAPOLs using the
 329                          * min basic rate
 330                          */
 331                         rate_idx = wlvif->ap.bcast_rate_idx;
 332                 else
 333                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 334         }
 335
 336         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 337
 338         /* for WEP shared auth - no fw encryption is needed */
 339         if (ieee80211_is_auth(frame_control) &&
 340             ieee80211_has_protected(frame_control))
 341                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 342
 343         desc->tx_attr = cpu_to_le16(tx_attr);
 344
 345         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 346         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 347 }
 348
 349 /* caller must hold wl->mutex */
 350 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 351                                    struct sk_buff *skb, u32 buf_offset, u8 hlid)
 352 {
 353         struct ieee80211_tx_info *info;
 354         u32 extra = 0;
 355         int ret = 0;
 356         u32 total_len;
 357         bool is_dummy;
 358         bool is_gem = false;
 359
 360         if (!skb) {
 361                 wl1271_error("discarding null skb");
 362                 return -EINVAL;
 363         }
 364
 365         if (hlid == WL12XX_INVALID_LINK_ID) {
 366                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 367                 return -EINVAL;
 368         }
 369
 370         info = IEEE80211_SKB_CB(skb);
 371
 372         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 373
 374         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 375             info->control.hw_key &&
 376             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 377                 extra = WL1271_EXTRA_SPACE_TKIP;
 378
 379         if (info->control.hw_key) {
 380                 bool is_wep;
 381                 u8 idx = info->control.hw_key->hw_key_idx;
 382                 u32 cipher = info->control.hw_key->cipher;
 383
 384                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 385                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 386
 387                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 388                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 389                         if (ret < 0)
 390                                 return ret;
 391                         wlvif->default_key = idx;
 392                 }
 393
 394                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 395         }
 396
 397         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 398                                  is_gem);
 399         if (ret < 0)
 400                 return ret;
 401
 402         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 403
 404         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 405                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 406                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 407         }
 408
 409         /*
 410          * The length of each packet is stored in terms of
 411          * words. Thus, we must pad the skb data to make sure its
 412          * length is aligned.  The number of padding bytes is computed
 413          * and set in wl1271_tx_fill_hdr.
 414          * In special cases, we want to align to a specific block size
 415          * (eg. for wl128x with SDIO we align to 256).
 416          */
 417         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 418
 419         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 420         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 421
 422         /* Revert side effects in the dummy packet skb, so it can be reused */
 423         if (is_dummy)
 424                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 425
 426         return total_len;
 427 }
 428
 429 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 430                                 enum ieee80211_band rate_band)
 431 {
 432         struct ieee80211_supported_band *band;
 433         u32 enabled_rates = 0;
 434         int bit;
 435
 436         band = wl->hw->wiphy->bands[rate_band];
 437         for (bit = 0; bit < band->n_bitrates; bit++) {
 438                 if (rate_set & 0x1)
 439                         enabled_rates |= band->bitrates[bit].hw_value;
 440                 rate_set >>= 1;
 441         }
 442
 443         /* MCS rates indication are on bits 16 - 31 */
 444         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 445
 446         for (bit = 0; bit < 16; bit++) {
 447                 if (rate_set & 0x1)
 448                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 449                 rate_set >>= 1;
 450         }
 451
 452         return enabled_rates;
 453 }
 454
 455 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 456 {
 457         int i;
 458
 459         for (i = 0; i < NUM_TX_QUEUES; i++) {
 460                 if (wlcore_is_queue_stopped_by_reason(wl, i,
 461                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 462                     wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 463                         /* firmware buffer has space, restart queues */
 464                         wlcore_wake_queue(wl, i,
 465                                           WLCORE_QUEUE_STOP_REASON_WATERMARK);
 466                 }
 467         }
 468 }
 469
 470 static int wlcore_select_ac(struct wl1271 *wl)
 471 {
 472         int i, q = -1, ac;
 473         u32 min_pkts = 0xffffffff;
 474
 475         /*
 476          * Find a non-empty ac where:
 477          * 1. There are packets to transmit
 478          * 2. The FW has the least allocated blocks
 479          *
 480          * We prioritize the ACs according to VO>VI>BE>BK
 481          */
 482         for (i = 0; i < NUM_TX_QUEUES; i++) {
 483                 ac = wl1271_tx_get_queue(i);
 484                 if (wl->tx_queue_count[ac] &&
 485                     wl->tx_allocated_pkts[ac] < min_pkts) {
 486                         q = ac;
 487                         min_pkts = wl->tx_allocated_pkts[q];
 488                 }
 489         }
 490
 491         return q;
 492 }
 493
 494 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
 495                                           struct wl1271_link *lnk, u8 q)
 496 {
 497         struct sk_buff *skb;
 498         unsigned long flags;
 499
 500         skb = skb_dequeue(&lnk->tx_queue[q]);
 501         if (skb) {
 502                 spin_lock_irqsave(&wl->wl_lock, flags);
 503                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 504                 wl->tx_queue_count[q]--;
 505                 if (lnk->wlvif) {
 506                         WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
 507                         lnk->wlvif->tx_queue_count[q]--;
 508                 }
 509                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 510         }
 511
 512         return skb;
 513 }
 514
 515 static bool wlcore_lnk_high_prio(struct wl1271 *wl, u8 hlid,
 516                                  struct wl1271_link *lnk)
 517 {
 518         u8 thold;
 519
 520         if (test_bit(hlid, (unsigned long *)&wl->fw_fast_lnk_map))
 521                 thold = wl->conf.tx.fast_link_thold;
 522         else
 523                 thold = wl->conf.tx.slow_link_thold;
 524
 525         return lnk->allocated_pkts < thold;
 526 }
 527
 528 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
 529                                                     u8 hlid, u8 ac,
 530                                                     u8 *low_prio_hlid)
 531 {
 532         struct wl1271_link *lnk = &wl->links[hlid];
 533
 534         if (!wlcore_lnk_high_prio(wl, hlid, lnk)) {
 535                 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
 536                     !skb_queue_empty(&lnk->tx_queue[ac]))
 537                         /* we found the first non-empty low priority queue */
 538                         *low_prio_hlid = hlid;
 539
 540                 return NULL;
 541         }
 542
 543         return wlcore_lnk_dequeue(wl, lnk, ac);
 544 }
 545
 546 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
 547                                                     struct wl12xx_vif *wlvif,
 548                                                     u8 ac, u8 *hlid,
 549                                                     u8 *low_prio_hlid)
 550 {
 551         struct sk_buff *skb = NULL;
 552         int i, h, start_hlid;
 553
 554         /* start from the link after the last one */
 555         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 556
 557         /* dequeue according to AC, round robin on each link */
 558         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 559                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 560
 561                 /* only consider connected stations */
 562                 if (!test_bit(h, wlvif->links_map))
 563                         continue;
 564
 565                 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
 566                                                    low_prio_hlid);
 567                 if (!skb)
 568                         continue;
 569
 570                 wlvif->last_tx_hlid = h;
 571                 break;
 572         }
 573
 574         if (!skb)
 575                 wlvif->last_tx_hlid = 0;
 576
 577         *hlid = wlvif->last_tx_hlid;
 578         return skb;
 579 }
 580
 581 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
 582 {
 583         unsigned long flags;
 584         struct wl12xx_vif *wlvif = wl->last_wlvif;
 585         struct sk_buff *skb = NULL;
 586         int ac;
 587         u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
 588
 589         ac = wlcore_select_ac(wl);
 590         if (ac < 0)
 591                 goto out;
 592
 593         /* continue from last wlvif (round robin) */
 594         if (wlvif) {
 595                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 596                         if (!wlvif->tx_queue_count[ac])
 597                                 continue;
 598
 599                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 600                                                            &low_prio_hlid);
 601                         if (!skb)
 602                                 continue;
 603
 604                         wl->last_wlvif = wlvif;
 605                         break;
 606                 }
 607         }
 608
 609         /* dequeue from the system HLID before the restarting wlvif list */
 610         if (!skb) {
 611                 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
 612                                                    ac, &low_prio_hlid);
 613                 if (skb) {
 614                         *hlid = wl->system_hlid;
 615                         wl->last_wlvif = NULL;
 616                 }
 617         }
 618
 619         /* Do a new pass over the wlvif list. But no need to continue
 620          * after last_wlvif. The previous pass should have found it. */
 621         if (!skb) {
 622                 wl12xx_for_each_wlvif(wl, wlvif) {
 623                         if (!wlvif->tx_queue_count[ac])
 624                                 goto next;
 625
 626                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 627                                                            &low_prio_hlid);
 628                         if (skb) {
 629                                 wl->last_wlvif = wlvif;
 630                                 break;
 631                         }
 632
 633 next:
 634                         if (wlvif == wl->last_wlvif)
 635                                 break;
 636                 }
 637         }
 638
 639         /* no high priority skbs found - but maybe a low priority one? */
 640         if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
 641                 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
 642                 skb = wlcore_lnk_dequeue(wl, lnk, ac);
 643
 644                 WARN_ON(!skb); /* we checked this before */
 645                 *hlid = low_prio_hlid;
 646
 647                 /* ensure proper round robin in the vif/link levels */
 648                 wl->last_wlvif = lnk->wlvif;
 649                 if (lnk->wlvif)
 650                         lnk->wlvif->last_tx_hlid = low_prio_hlid;
 651
 652         }
 653
 654         if (!skb &&
 655             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 656                 int q;
 657
 658                 skb = wl->dummy_packet;
 659                 *hlid = wl->system_hlid;
 660                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 661                 spin_lock_irqsave(&wl->wl_lock, flags);
 662                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 663                 wl->tx_queue_count[q]--;
 664                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 665         }
 666
 667 out:
 668         return skb;
 669 }
 670
 671 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 672                                   struct sk_buff *skb, u8 hlid)
 673 {
 674         unsigned long flags;
 675         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 676
 677         if (wl12xx_is_dummy_packet(wl, skb)) {
 678                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 679         } else {
 680                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 681
 682                 /* make sure we dequeue the same packet next time */
 683                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 684                                       WL12XX_MAX_LINKS;
 685         }
 686
 687         spin_lock_irqsave(&wl->wl_lock, flags);
 688         wl->tx_queue_count[q]++;
 689         if (wlvif)
 690                 wlvif->tx_queue_count[q]++;
 691         spin_unlock_irqrestore(&wl->wl_lock, flags);
 692 }
 693
 694 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 695 {
 696         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 697
 698         return ieee80211_is_data_present(hdr->frame_control);
 699 }
 700
 701 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 702 {
 703         struct wl12xx_vif *wlvif;
 704         u32 timeout;
 705         u8 hlid;
 706
 707         if (!wl->conf.rx_streaming.interval)
 708                 return;
 709
 710         if (!wl->conf.rx_streaming.always &&
 711             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 712                 return;
 713
 714         timeout = wl->conf.rx_streaming.duration;
 715         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 716                 bool found = false;
 717                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 718                         if (test_bit(hlid, wlvif->links_map)) {
 719                                 found  = true;
 720                                 break;
 721                         }
 722                 }
 723
 724                 if (!found)
 725                         continue;
 726
 727                 /* enable rx streaming */
 728                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 729                         ieee80211_queue_work(wl->hw,
 730                                              &wlvif->rx_streaming_enable_work);
 731
 732                 mod_timer(&wlvif->rx_streaming_timer,
 733                           jiffies + msecs_to_jiffies(timeout));
 734         }
 735 }
 736
 737 /*
 738  * Returns failure values only in case of failed bus ops within this function.
 739  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
 740  * triggering recovery by higher layers when not necessary.
 741  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
 742  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
 743  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
 744  * within prepare_tx_frame code but there's nothing we should do about those
 745  * as well.
 746  */
 747 int wlcore_tx_work_locked(struct wl1271 *wl)
 748 {
 749         struct wl12xx_vif *wlvif;
 750         struct sk_buff *skb;
 751         struct wl1271_tx_hw_descr *desc;
 752         u32 buf_offset = 0, last_len = 0;
 753         bool sent_packets = false;
 754         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 755         int ret = 0;
 756         int bus_ret = 0;
 757         u8 hlid;
 758
 759         if (unlikely(wl->state != WLCORE_STATE_ON))
 760                 return 0;
 761
 762         while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
 763                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 764                 bool has_data = false;
 765
 766                 wlvif = NULL;
 767                 if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
 768                         wlvif = wl12xx_vif_to_data(info->control.vif);
 769                 else
 770                         hlid = wl->system_hlid;
 771
 772                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 773                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
 774                                               hlid);
 775                 if (ret == -EAGAIN) {
 776                         /*
 777                          * Aggregation buffer is full.
 778                          * Flush buffer and try again.
 779                          */
 780                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 781
 782                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 783                                                             last_len);
 784                         bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
 785                                              wl->aggr_buf, buf_offset, true);
 786                         if (bus_ret < 0)
 787                                 goto out;
 788
 789                         sent_packets = true;
 790                         buf_offset = 0;
 791                         continue;
 792                 } else if (ret == -EBUSY) {
 793                         /*
 794                          * Firmware buffer is full.
 795                          * Queue back last skb, and stop aggregating.
 796                          */
 797                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 798                         /* No work left, avoid scheduling redundant tx work */
 799                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 800                         goto out_ack;
 801                 } else if (ret < 0) {
 802                         if (wl12xx_is_dummy_packet(wl, skb))
 803                                 /*
 804                                  * fw still expects dummy packet,
 805                                  * so re-enqueue it
 806                                  */
 807                                 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 808                         else
 809                                 ieee80211_free_txskb(wl->hw, skb);
 810                         goto out_ack;
 811                 }
 812                 last_len = ret;
 813                 buf_offset += last_len;
 814                 wl->tx_packets_count++;
 815                 if (has_data) {
 816                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 817                         __set_bit(desc->hlid, active_hlids);
 818                 }
 819         }
 820
 821 out_ack:
 822         if (buf_offset) {
 823                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 824                 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 825                                              buf_offset, true);
 826                 if (bus_ret < 0)
 827                         goto out;
 828
 829                 sent_packets = true;
 830         }
 831         if (sent_packets) {
 832                 /*
 833                  * Interrupt the firmware with the new packets. This is only
 834                  * required for older hardware revisions
 835                  */
 836                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 837                         bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
 838                                              wl->tx_packets_count);
 839                         if (bus_ret < 0)
 840                                 goto out;
 841                 }
 842
 843                 wl1271_handle_tx_low_watermark(wl);
 844         }
 845         wl12xx_rearm_rx_streaming(wl, active_hlids);
 846
 847 out:
 848         return bus_ret;
 849 }
 850
 851 void wl1271_tx_work(struct work_struct *work)
 852 {
 853         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 854         int ret;
 855
 856         mutex_lock(&wl->mutex);
 857         ret = wl1271_ps_elp_wakeup(wl);
 858         if (ret < 0)
 859                 goto out;
 860
 861         ret = wlcore_tx_work_locked(wl);
 862         if (ret < 0) {
 863                 wl12xx_queue_recovery_work(wl);
 864                 goto out;
 865         }
 866
 867         wl1271_ps_elp_sleep(wl);
 868 out:
 869         mutex_unlock(&wl->mutex);
 870 }
 871
 872 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 873 {
 874         u8 flags = 0;
 875
 876         /*
 877          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 878          * only it uses Tx-completion.
 879          */
 880         if (rate_class_index <= 8)
 881                 flags |= IEEE80211_TX_RC_MCS;
 882
 883         /*
 884          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 885          * only it uses Tx-completion.
 886          */
 887         if (rate_class_index == 0)
 888                 flags |= IEEE80211_TX_RC_SHORT_GI;
 889
 890         return flags;
 891 }
 892
 893 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 894                                       struct wl1271_tx_hw_res_descr *result)
 895 {
 896         struct ieee80211_tx_info *info;
 897         struct ieee80211_vif *vif;
 898         struct wl12xx_vif *wlvif;
 899         struct sk_buff *skb;
 900         int id = result->id;
 901         int rate = -1;
 902         u8 rate_flags = 0;
 903         u8 retries = 0;
 904
 905         /* check for id legality */
 906         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 907                 wl1271_warning("TX result illegal id: %d", id);
 908                 return;
 909         }
 910
 911         skb = wl->tx_frames[id];
 912         info = IEEE80211_SKB_CB(skb);
 913
 914         if (wl12xx_is_dummy_packet(wl, skb)) {
 915                 wl1271_free_tx_id(wl, id);
 916                 return;
 917         }
 918
 919         /* info->control is valid as long as we don't update info->status */
 920         vif = info->control.vif;
 921         wlvif = wl12xx_vif_to_data(vif);
 922
 923         /* update the TX status info */
 924         if (result->status == TX_SUCCESS) {
 925                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 926                         info->flags |= IEEE80211_TX_STAT_ACK;
 927                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 928                                           wlvif->band);
 929                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 930                 retries = result->ack_failures;
 931         } else if (result->status == TX_RETRY_EXCEEDED) {
 932                 wl->stats.excessive_retries++;
 933                 retries = result->ack_failures;
 934         }
 935
 936         info->status.rates[0].idx = rate;
 937         info->status.rates[0].count = retries;
 938         info->status.rates[0].flags = rate_flags;
 939         info->status.ack_signal = -1;
 940
 941         wl->stats.retry_count += result->ack_failures;
 942
 943         /*
 944          * update sequence number only when relevant, i.e. only in
 945          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 946          */
 947         if (info->control.hw_key &&
 948             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 949              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 950              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 951                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 952                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 953
 954                 /*
 955                  * update security sequence number, taking care of potential
 956                  * wrap-around
 957                  */
 958                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 959                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 960         }
 961
 962         /* remove private header from packet */
 963         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 964
 965         /* remove TKIP header space if present */
 966         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 967             info->control.hw_key &&
 968             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 969                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 970                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 971                         hdrlen);
 972                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 973         }
 974
 975         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 976                      " status 0x%x",
 977                      result->id, skb, result->ack_failures,
 978                      result->rate_class_index, result->status);
 979
 980         /* return the packet to the stack */
 981         skb_queue_tail(&wl->deferred_tx_queue, skb);
 982         queue_work(wl->freezable_wq, &wl->netstack_work);
 983         wl1271_free_tx_id(wl, result->id);
 984 }
 985
 986 /* Called upon reception of a TX complete interrupt */
 987 int wlcore_tx_complete(struct wl1271 *wl)
 988 {
 989         struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
 990         u32 count, fw_counter;
 991         u32 i;
 992         int ret;
 993
 994         /* read the tx results from the chipset */
 995         ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
 996                           wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 997         if (ret < 0)
 998                 goto out;
 999
1000         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
1001
1002         /* write host counter to chipset (to ack) */
1003         ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
1004                              offsetof(struct wl1271_tx_hw_res_if,
1005                                       tx_result_host_counter), fw_counter);
1006         if (ret < 0)
1007                 goto out;
1008
1009         count = fw_counter - wl->tx_results_count;
1010         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
1011
1012         /* verify that the result buffer is not getting overrun */
1013         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1014                 wl1271_warning("TX result overflow from chipset: %d", count);
1015
1016         /* process the results */
1017         for (i = 0; i < count; i++) {
1018                 struct wl1271_tx_hw_res_descr *result;
1019                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1020
1021                 /* process the packet */
1022                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
1023                 wl1271_tx_complete_packet(wl, result);
1024
1025                 wl->tx_results_count++;
1026         }
1027
1028 out:
1029         return ret;
1030 }
1031 EXPORT_SYMBOL(wlcore_tx_complete);
1032
1033 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1034 {
1035         struct sk_buff *skb;
1036         int i;
1037         unsigned long flags;
1038         struct ieee80211_tx_info *info;
1039         int total[NUM_TX_QUEUES];
1040         struct wl1271_link *lnk = &wl->links[hlid];
1041
1042         for (i = 0; i < NUM_TX_QUEUES; i++) {
1043                 total[i] = 0;
1044                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1045                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1046
1047                         if (!wl12xx_is_dummy_packet(wl, skb)) {
1048                                 info = IEEE80211_SKB_CB(skb);
1049                                 info->status.rates[0].idx = -1;
1050                                 info->status.rates[0].count = 0;
1051                                 ieee80211_tx_status_ni(wl->hw, skb);
1052                         }
1053
1054                         total[i]++;
1055                 }
1056         }
1057
1058         spin_lock_irqsave(&wl->wl_lock, flags);
1059         for (i = 0; i < NUM_TX_QUEUES; i++) {
1060                 wl->tx_queue_count[i] -= total[i];
1061                 if (lnk->wlvif)
1062                         lnk->wlvif->tx_queue_count[i] -= total[i];
1063         }
1064         spin_unlock_irqrestore(&wl->wl_lock, flags);
1065
1066         wl1271_handle_tx_low_watermark(wl);
1067 }
1068
1069 /* caller must hold wl->mutex and TX must be stopped */
1070 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1071 {
1072         int i;
1073
1074         /* TX failure */
1075         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1076                 if (wlvif->bss_type == BSS_TYPE_AP_BSS) {
1077                         /* this calls wl12xx_free_link */
1078                         wl1271_free_sta(wl, wlvif, i);
1079                 } else {
1080                         u8 hlid = i;
1081                         wlvif->sta.ba_rx_bitmap = 0;
1082                         wl12xx_free_link(wl, wlvif, &hlid);
1083                 }
1084         }
1085         wlvif->last_tx_hlid = 0;
1086
1087         for (i = 0; i < NUM_TX_QUEUES; i++)
1088                 wlvif->tx_queue_count[i] = 0;
1089 }
1090 /* caller must hold wl->mutex and TX must be stopped */
1091 void wl12xx_tx_reset(struct wl1271 *wl)
1092 {
1093         int i;
1094         struct sk_buff *skb;
1095         struct ieee80211_tx_info *info;
1096
1097         /* only reset the queues if something bad happened */
1098         if (wl1271_tx_total_queue_count(wl) != 0) {
1099                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1100                         wl1271_tx_reset_link_queues(wl, i);
1101
1102                 for (i = 0; i < NUM_TX_QUEUES; i++)
1103                         wl->tx_queue_count[i] = 0;
1104         }
1105
1106         /*
1107          * Make sure the driver is at a consistent state, in case this
1108          * function is called from a context other than interface removal.
1109          * This call will always wake the TX queues.
1110          */
1111         wl1271_handle_tx_low_watermark(wl);
1112
1113         for (i = 0; i < wl->num_tx_desc; i++) {
1114                 if (wl->tx_frames[i] == NULL)
1115                         continue;
1116
1117                 skb = wl->tx_frames[i];
1118                 wl1271_free_tx_id(wl, i);
1119                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1120
1121                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1122                         /*
1123                          * Remove private headers before passing the skb to
1124                          * mac80211
1125                          */
1126                         info = IEEE80211_SKB_CB(skb);
1127                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1128                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1129                             info->control.hw_key &&
1130                             info->control.hw_key->cipher ==
1131                             WLAN_CIPHER_SUITE_TKIP) {
1132                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1133                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1134                                         skb->data, hdrlen);
1135                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1136                         }
1137
1138                         info->status.rates[0].idx = -1;
1139                         info->status.rates[0].count = 0;
1140
1141                         ieee80211_tx_status_ni(wl->hw, skb);
1142                 }
1143         }
1144 }
1145
1146 #define WL1271_TX_FLUSH_TIMEOUT 500000
1147
1148 /* caller must *NOT* hold wl->mutex */
1149 void wl1271_tx_flush(struct wl1271 *wl)
1150 {
1151         unsigned long timeout, start_time;
1152         int i;
1153         start_time = jiffies;
1154         timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1155
1156         /* only one flush should be in progress, for consistent queue state */
1157         mutex_lock(&wl->flush_mutex);
1158
1159         mutex_lock(&wl->mutex);
1160         if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1161                 mutex_unlock(&wl->mutex);
1162                 goto out;
1163         }
1164
1165         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1166
1167         while (!time_after(jiffies, timeout)) {
1168                 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1169                              wl->tx_frames_cnt,
1170                              wl1271_tx_total_queue_count(wl));
1171
1172                 /* force Tx and give the driver some time to flush data */
1173                 mutex_unlock(&wl->mutex);
1174                 if (wl1271_tx_total_queue_count(wl))
1175                         wl1271_tx_work(&wl->tx_work);
1176                 msleep(20);
1177                 mutex_lock(&wl->mutex);
1178
1179                 if ((wl->tx_frames_cnt == 0) &&
1180                     (wl1271_tx_total_queue_count(wl) == 0)) {
1181                         wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1182                                      jiffies_to_msecs(jiffies - start_time));
1183                         goto out_wake;
1184                 }
1185         }
1186
1187         wl1271_warning("Unable to flush all TX buffers, "
1188                        "timed out (timeout %d ms",
1189                        WL1271_TX_FLUSH_TIMEOUT / 1000);
1190
1191         /* forcibly flush all Tx buffers on our queues */
1192         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1193                 wl1271_tx_reset_link_queues(wl, i);
1194
1195 out_wake:
1196         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1197         mutex_unlock(&wl->mutex);
1198 out:
1199         mutex_unlock(&wl->flush_mutex);
1200 }
1201 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1202
1203 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1204 {
1205         if (WARN_ON(!rate_set))
1206                 return 0;
1207
1208         return BIT(__ffs(rate_set));
1209 }
1210 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1211
1212 void wlcore_stop_queue_locked(struct wl1271 *wl, u8 queue,
1213                               enum wlcore_queue_stop_reason reason)
1214 {
1215         bool stopped = !!wl->queue_stop_reasons[queue];
1216
1217         /* queue should not be stopped for this reason */
1218         WARN_ON(test_and_set_bit(reason, &wl->queue_stop_reasons[queue]));
1219
1220         if (stopped)
1221                 return;
1222
1223         ieee80211_stop_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1224 }
1225
1226 void wlcore_stop_queue(struct wl1271 *wl, u8 queue,
1227                        enum wlcore_queue_stop_reason reason)
1228 {
1229         unsigned long flags;
1230
1231         spin_lock_irqsave(&wl->wl_lock, flags);
1232         wlcore_stop_queue_locked(wl, queue, reason);
1233         spin_unlock_irqrestore(&wl->wl_lock, flags);
1234 }
1235
1236 void wlcore_wake_queue(struct wl1271 *wl, u8 queue,
1237                        enum wlcore_queue_stop_reason reason)
1238 {
1239         unsigned long flags;
1240
1241         spin_lock_irqsave(&wl->wl_lock, flags);
1242
1243         /* queue should not be clear for this reason */
1244         WARN_ON(!test_and_clear_bit(reason, &wl->queue_stop_reasons[queue]));
1245
1246         if (wl->queue_stop_reasons[queue])
1247                 goto out;
1248
1249         ieee80211_wake_queue(wl->hw, wl1271_tx_get_mac80211_queue(queue));
1250
1251 out:
1252         spin_unlock_irqrestore(&wl->wl_lock, flags);
1253 }
1254
1255 void wlcore_stop_queues(struct wl1271 *wl,
1256                         enum wlcore_queue_stop_reason reason)
1257 {
1258         int i;
1259
1260         for (i = 0; i < NUM_TX_QUEUES; i++)
1261                 wlcore_stop_queue(wl, i, reason);
1262 }
1263 EXPORT_SYMBOL_GPL(wlcore_stop_queues);
1264
1265 void wlcore_wake_queues(struct wl1271 *wl,
1266                         enum wlcore_queue_stop_reason reason)
1267 {
1268         int i;
1269
1270         for (i = 0; i < NUM_TX_QUEUES; i++)
1271                 wlcore_wake_queue(wl, i, reason);
1272 }
1273 EXPORT_SYMBOL_GPL(wlcore_wake_queues);
1274
1275 void wlcore_reset_stopped_queues(struct wl1271 *wl)
1276 {
1277         int i;
1278         unsigned long flags;
1279
1280         spin_lock_irqsave(&wl->wl_lock, flags);
1281
1282         for (i = 0; i < NUM_TX_QUEUES; i++) {
1283                 if (!wl->queue_stop_reasons[i])
1284                         continue;
1285
1286                 wl->queue_stop_reasons[i] = 0;
1287                 ieee80211_wake_queue(wl->hw,
1288                                      wl1271_tx_get_mac80211_queue(i));
1289         }
1290
1291         spin_unlock_irqrestore(&wl->wl_lock, flags);
1292 }
1293
1294 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl, u8 queue,
1295                              enum wlcore_queue_stop_reason reason)
1296 {
1297         return test_bit(reason, &wl->queue_stop_reasons[queue]);
1298 }
1299
1300 bool wlcore_is_queue_stopped(struct wl1271 *wl, u8 queue)
1301 {
1302         return !!wl->queue_stop_reasons[queue];
1303 }