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 #include <linux/spinlock.h>
  28
  29 #include "wlcore.h"
  30 #include "debug.h"
  31 #include "io.h"
  32 #include "ps.h"
  33 #include "tx.h"
  34 #include "event.h"
  35 #include "hw_ops.h"
  36
  37 /*
  38  * TODO: this is here just for now, it must be removed when the data
  39  * operations are in place.
  40  */
  41 #include "../wl12xx/reg.h"
  42
  43 static int wl1271_set_default_wep_key(struct wl1271 *wl,
  44                                       struct wl12xx_vif *wlvif, u8 id)
  45 {
  46         int ret;
  47         bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
  48
  49         if (is_ap)
  50                 ret = wl12xx_cmd_set_default_wep_key(wl, id,
  51                                                      wlvif->ap.bcast_hlid);
  52         else
  53                 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
  54
  55         if (ret < 0)
  56                 return ret;
  57
  58         wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
  59         return 0;
  60 }
  61
  62 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
  63 {
  64         int id;
  65
  66         id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
  67         if (id >= wl->num_tx_desc)
  68                 return -EBUSY;
  69
  70         __set_bit(id, wl->tx_frames_map);
  71         wl->tx_frames[id] = skb;
  72         wl->tx_frames_cnt++;
  73         return id;
  74 }
  75
  76 void wl1271_free_tx_id(struct wl1271 *wl, int id)
  77 {
  78         if (__test_and_clear_bit(id, wl->tx_frames_map)) {
  79                 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
  80                         clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
  81
  82                 wl->tx_frames[id] = NULL;
  83                 wl->tx_frames_cnt--;
  84         }
  85 }
  86 EXPORT_SYMBOL(wl1271_free_tx_id);
  87
  88 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  89                                                  struct wl12xx_vif *wlvif,
  90                                                  struct sk_buff *skb)
  91 {
  92         struct ieee80211_hdr *hdr;
  93
  94         hdr = (struct ieee80211_hdr *)(skb->data +
  95                                        sizeof(struct wl1271_tx_hw_descr));
  96         if (!ieee80211_is_auth(hdr->frame_control))
  97                 return;
  98
  99         /*
 100          * add the station to the known list before transmitting the
 101          * authentication response. this way it won't get de-authed by FW
 102          * when transmitting too soon.
 103          */
 104         wl1271_acx_set_inconnection_sta(wl, wlvif, hdr->addr1);
 105
 106         /*
 107          * ROC for 1 second on the AP channel for completing the connection.
 108          * Note the ROC will be continued by the update_sta_state callbacks
 109          * once the station reaches the associated state.
 110          */
 111         wlcore_update_inconn_sta(wl, wlvif, NULL, true);
 112         wlvif->pending_auth_reply_time = jiffies;
 113         cancel_delayed_work(&wlvif->pending_auth_complete_work);
 114         ieee80211_queue_delayed_work(wl->hw,
 115                                 &wlvif->pending_auth_complete_work,
 116                                 msecs_to_jiffies(WLCORE_PEND_AUTH_ROC_TIMEOUT));
 117 }
 118
 119 static void wl1271_tx_regulate_link(struct wl1271 *wl,
 120                                     struct wl12xx_vif *wlvif,
 121                                     u8 hlid)
 122 {
 123         bool fw_ps;
 124         u8 tx_pkts;
 125
 126         if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
 127                 return;
 128
 129         fw_ps = test_bit(hlid, &wl->ap_fw_ps_map);
 130         tx_pkts = wl->links[hlid].allocated_pkts;
 131
 132         /*
 133          * if in FW PS and there is enough data in FW we can put the link
 134          * into high-level PS and clean out its TX queues.
 135          * Make an exception if this is the only connected link. In this
 136          * case FW-memory congestion is less of a problem.
 137          * Note that a single connected STA means 2*ap_count + 1 active links,
 138          * since we must account for the global and broadcast AP links
 139          * for each AP. The "fw_ps" check assures us the other link is a STA
 140          * connected to the AP. Otherwise the FW would not set the PSM bit.
 141          */
 142         if (wl->active_link_count > (wl->ap_count*2 + 1) && fw_ps &&
 143             tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 144                 wl12xx_ps_link_start(wl, wlvif, hlid, true);
 145 }
 146
 147 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
 148 {
 149         return wl->dummy_packet == skb;
 150 }
 151 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
 152
 153 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 154                                 struct sk_buff *skb, struct ieee80211_sta *sta)
 155 {
 156         if (sta) {
 157                 struct wl1271_station *wl_sta;
 158
 159                 wl_sta = (struct wl1271_station *)sta->drv_priv;
 160                 return wl_sta->hlid;
 161         } else {
 162                 struct ieee80211_hdr *hdr;
 163
 164                 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
 165                         return wl->system_hlid;
 166
 167                 hdr = (struct ieee80211_hdr *)skb->data;
 168                 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 169                         return wlvif->ap.bcast_hlid;
 170                 else
 171                         return wlvif->ap.global_hlid;
 172         }
 173 }
 174
 175 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 176                       struct sk_buff *skb, struct ieee80211_sta *sta)
 177 {
 178         struct ieee80211_tx_info *control;
 179
 180         if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 181                 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
 182
 183         control = IEEE80211_SKB_CB(skb);
 184         if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
 185                 wl1271_debug(DEBUG_TX, "tx offchannel");
 186                 return wlvif->dev_hlid;
 187         }
 188
 189         return wlvif->sta.hlid;
 190 }
 191
 192 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
 193                                           unsigned int packet_length)
 194 {
 195         if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
 196             !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
 197                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 198         else
 199                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 200 }
 201 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 202
 203 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 204                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 205                               u8 hlid, bool is_gem)
 206 {
 207         struct wl1271_tx_hw_descr *desc;
 208         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 209         u32 total_blocks;
 210         int id, ret = -EBUSY, ac;
 211         u32 spare_blocks;
 212
 213         if (buf_offset + total_len > wl->aggr_buf_size)
 214                 return -EAGAIN;
 215
 216         spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
 217
 218         /* allocate free identifier for the packet */
 219         id = wl1271_alloc_tx_id(wl, skb);
 220         if (id < 0)
 221                 return id;
 222
 223         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 224
 225         if (total_blocks <= wl->tx_blocks_available) {
 226                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 227                         skb, total_len - skb->len);
 228
 229                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 230                                              spare_blocks);
 231
 232                 desc->id = id;
 233
 234                 wl->tx_blocks_available -= total_blocks;
 235                 wl->tx_allocated_blocks += total_blocks;
 236
 237                 /*
 238                  * If the FW was empty before, arm the Tx watchdog. Also do
 239                  * this on the first Tx after resume, as we always cancel the
 240                  * watchdog on suspend.
 241                  */
 242                 if (wl->tx_allocated_blocks == total_blocks ||
 243                     test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags))
 244                         wl12xx_rearm_tx_watchdog_locked(wl);
 245
 246                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 247                 wl->tx_allocated_pkts[ac]++;
 248
 249                 if (test_bit(hlid, wl->links_map))
 250                         wl->links[hlid].allocated_pkts++;
 251
 252                 ret = 0;
 253
 254                 wl1271_debug(DEBUG_TX,
 255                              "tx_allocate: size: %d, blocks: %d, id: %d",
 256                              total_len, total_blocks, id);
 257         } else {
 258                 wl1271_free_tx_id(wl, id);
 259         }
 260
 261         return ret;
 262 }
 263
 264 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 265                                struct sk_buff *skb, u32 extra,
 266                                struct ieee80211_tx_info *control, u8 hlid)
 267 {
 268         struct timespec ts;
 269         struct wl1271_tx_hw_descr *desc;
 270         int ac, rate_idx;
 271         s64 hosttime;
 272         u16 tx_attr = 0;
 273         __le16 frame_control;
 274         struct ieee80211_hdr *hdr;
 275         u8 *frame_start;
 276         bool is_dummy;
 277
 278         desc = (struct wl1271_tx_hw_descr *) skb->data;
 279         frame_start = (u8 *)(desc + 1);
 280         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 281         frame_control = hdr->frame_control;
 282
 283         /* relocate space for security header */
 284         if (extra) {
 285                 int hdrlen = ieee80211_hdrlen(frame_control);
 286                 memmove(frame_start, hdr, hdrlen);
 287                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 288         }
 289
 290         /* configure packet life time */
 291         getnstimeofday(&ts);
 292         hosttime = (timespec_to_ns(&ts) >> 10);
 293         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 294
 295         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 296         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 297                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 298         else
 299                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 300
 301         /* queue */
 302         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 303         desc->tid = skb->priority;
 304
 305         if (is_dummy) {
 306                 /*
 307                  * FW expects the dummy packet to have an invalid session id -
 308                  * any session id that is different than the one set in the join
 309                  */
 310                 tx_attr = (SESSION_COUNTER_INVALID <<
 311                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 312                            TX_HW_ATTR_SESSION_COUNTER;
 313
 314                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 315         } else if (wlvif) {
 316                 u8 session_id = wl->session_ids[hlid];
 317
 318                 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
 319                     (wlvif->bss_type == BSS_TYPE_AP_BSS))
 320                         session_id = 0;
 321
 322                 /* configure the tx attributes */
 323                 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
 324         }
 325
 326         desc->hlid = hlid;
 327         if (is_dummy || !wlvif)
 328                 rate_idx = 0;
 329         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 330                 /*
 331                  * if the packets are data packets
 332                  * send them with AP rate policies (EAPOLs are an exception),
 333                  * otherwise use default basic rates
 334                  */
 335                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 336                         rate_idx = wlvif->sta.basic_rate_idx;
 337                 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 338                         rate_idx = wlvif->sta.p2p_rate_idx;
 339                 else if (ieee80211_is_data(frame_control))
 340                         rate_idx = wlvif->sta.ap_rate_idx;
 341                 else
 342                         rate_idx = wlvif->sta.basic_rate_idx;
 343         } else {
 344                 if (hlid == wlvif->ap.global_hlid)
 345                         rate_idx = wlvif->ap.mgmt_rate_idx;
 346                 else if (hlid == wlvif->ap.bcast_hlid ||
 347                          skb->protocol == cpu_to_be16(ETH_P_PAE) ||
 348                          !ieee80211_is_data(frame_control))
 349                         /*
 350                          * send non-data, bcast and EAPOLs using the
 351                          * min basic rate
 352                          */
 353                         rate_idx = wlvif->ap.bcast_rate_idx;
 354                 else
 355                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 356         }
 357
 358         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 359
 360         /* for WEP shared auth - no fw encryption is needed */
 361         if (ieee80211_is_auth(frame_control) &&
 362             ieee80211_has_protected(frame_control))
 363                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 364
 365         /* send EAPOL frames as voice */
 366         if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
 367                 tx_attr |= TX_HW_ATTR_EAPOL_FRAME;
 368
 369         desc->tx_attr = cpu_to_le16(tx_attr);
 370
 371         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 372         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 373 }
 374
 375 /* caller must hold wl->mutex */
 376 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 377                                    struct sk_buff *skb, u32 buf_offset, u8 hlid)
 378 {
 379         struct ieee80211_tx_info *info;
 380         u32 extra = 0;
 381         int ret = 0;
 382         u32 total_len;
 383         bool is_dummy;
 384         bool is_gem = false;
 385
 386         if (!skb) {
 387                 wl1271_error("discarding null skb");
 388                 return -EINVAL;
 389         }
 390
 391         if (hlid == WL12XX_INVALID_LINK_ID) {
 392                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 393                 return -EINVAL;
 394         }
 395
 396         info = IEEE80211_SKB_CB(skb);
 397
 398         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 399
 400         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 401             info->control.hw_key &&
 402             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 403                 extra = WL1271_EXTRA_SPACE_TKIP;
 404
 405         if (info->control.hw_key) {
 406                 bool is_wep;
 407                 u8 idx = info->control.hw_key->hw_key_idx;
 408                 u32 cipher = info->control.hw_key->cipher;
 409
 410                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 411                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 412
 413                 if (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) {
 414                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 415                         if (ret < 0)
 416                                 return ret;
 417                         wlvif->default_key = idx;
 418                 }
 419
 420                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 421         }
 422
 423         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 424                                  is_gem);
 425         if (ret < 0)
 426                 return ret;
 427
 428         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 429
 430         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 431                 wl1271_tx_ap_update_inconnection_sta(wl, wlvif, skb);
 432                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 433         }
 434
 435         /*
 436          * The length of each packet is stored in terms of
 437          * words. Thus, we must pad the skb data to make sure its
 438          * length is aligned.  The number of padding bytes is computed
 439          * and set in wl1271_tx_fill_hdr.
 440          * In special cases, we want to align to a specific block size
 441          * (eg. for wl128x with SDIO we align to 256).
 442          */
 443         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 444
 445         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 446         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 447
 448         /* Revert side effects in the dummy packet skb, so it can be reused */
 449         if (is_dummy)
 450                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 451
 452         return total_len;
 453 }
 454
 455 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 456                                 enum nl80211_band rate_band)
 457 {
 458         struct ieee80211_supported_band *band;
 459         u32 enabled_rates = 0;
 460         int bit;
 461
 462         band = wl->hw->wiphy->bands[rate_band];
 463         for (bit = 0; bit < band->n_bitrates; bit++) {
 464                 if (rate_set & 0x1)
 465                         enabled_rates |= band->bitrates[bit].hw_value;
 466                 rate_set >>= 1;
 467         }
 468
 469         /* MCS rates indication are on bits 16 - 31 */
 470         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 471
 472         for (bit = 0; bit < 16; bit++) {
 473                 if (rate_set & 0x1)
 474                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 475                 rate_set >>= 1;
 476         }
 477
 478         return enabled_rates;
 479 }
 480
 481 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 482 {
 483         int i;
 484         struct wl12xx_vif *wlvif;
 485
 486         wl12xx_for_each_wlvif(wl, wlvif) {
 487                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 488                         if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
 489                                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 490                             wlvif->tx_queue_count[i] <=
 491                                         WL1271_TX_QUEUE_LOW_WATERMARK)
 492                                 /* firmware buffer has space, restart queues */
 493                                 wlcore_wake_queue(wl, wlvif, i,
 494                                         WLCORE_QUEUE_STOP_REASON_WATERMARK);
 495                 }
 496         }
 497 }
 498
 499 static int wlcore_select_ac(struct wl1271 *wl)
 500 {
 501         int i, q = -1, ac;
 502         u32 min_pkts = 0xffffffff;
 503
 504         /*
 505          * Find a non-empty ac where:
 506          * 1. There are packets to transmit
 507          * 2. The FW has the least allocated blocks
 508          *
 509          * We prioritize the ACs according to VO>VI>BE>BK
 510          */
 511         for (i = 0; i < NUM_TX_QUEUES; i++) {
 512                 ac = wl1271_tx_get_queue(i);
 513                 if (wl->tx_queue_count[ac] &&
 514                     wl->tx_allocated_pkts[ac] < min_pkts) {
 515                         q = ac;
 516                         min_pkts = wl->tx_allocated_pkts[q];
 517                 }
 518         }
 519
 520         return q;
 521 }
 522
 523 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
 524                                           struct wl1271_link *lnk, u8 q)
 525 {
 526         struct sk_buff *skb;
 527         unsigned long flags;
 528
 529         skb = skb_dequeue(&lnk->tx_queue[q]);
 530         if (skb) {
 531                 spin_lock_irqsave(&wl->wl_lock, flags);
 532                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 533                 wl->tx_queue_count[q]--;
 534                 if (lnk->wlvif) {
 535                         WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
 536                         lnk->wlvif->tx_queue_count[q]--;
 537                 }
 538                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 539         }
 540
 541         return skb;
 542 }
 543
 544 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
 545                                                     u8 hlid, u8 ac,
 546                                                     u8 *low_prio_hlid)
 547 {
 548         struct wl1271_link *lnk = &wl->links[hlid];
 549
 550         if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
 551                 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
 552                     !skb_queue_empty(&lnk->tx_queue[ac]) &&
 553                     wlcore_hw_lnk_low_prio(wl, hlid, lnk))
 554                         /* we found the first non-empty low priority queue */
 555                         *low_prio_hlid = hlid;
 556
 557                 return NULL;
 558         }
 559
 560         return wlcore_lnk_dequeue(wl, lnk, ac);
 561 }
 562
 563 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
 564                                                     struct wl12xx_vif *wlvif,
 565                                                     u8 ac, u8 *hlid,
 566                                                     u8 *low_prio_hlid)
 567 {
 568         struct sk_buff *skb = NULL;
 569         int i, h, start_hlid;
 570
 571         /* start from the link after the last one */
 572         start_hlid = (wlvif->last_tx_hlid + 1) % wl->num_links;
 573
 574         /* dequeue according to AC, round robin on each link */
 575         for (i = 0; i < wl->num_links; i++) {
 576                 h = (start_hlid + i) % wl->num_links;
 577
 578                 /* only consider connected stations */
 579                 if (!test_bit(h, wlvif->links_map))
 580                         continue;
 581
 582                 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
 583                                                    low_prio_hlid);
 584                 if (!skb)
 585                         continue;
 586
 587                 wlvif->last_tx_hlid = h;
 588                 break;
 589         }
 590
 591         if (!skb)
 592                 wlvif->last_tx_hlid = 0;
 593
 594         *hlid = wlvif->last_tx_hlid;
 595         return skb;
 596 }
 597
 598 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
 599 {
 600         unsigned long flags;
 601         struct wl12xx_vif *wlvif = wl->last_wlvif;
 602         struct sk_buff *skb = NULL;
 603         int ac;
 604         u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
 605
 606         ac = wlcore_select_ac(wl);
 607         if (ac < 0)
 608                 goto out;
 609
 610         /* continue from last wlvif (round robin) */
 611         if (wlvif) {
 612                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 613                         if (!wlvif->tx_queue_count[ac])
 614                                 continue;
 615
 616                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 617                                                            &low_prio_hlid);
 618                         if (!skb)
 619                                 continue;
 620
 621                         wl->last_wlvif = wlvif;
 622                         break;
 623                 }
 624         }
 625
 626         /* dequeue from the system HLID before the restarting wlvif list */
 627         if (!skb) {
 628                 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
 629                                                    ac, &low_prio_hlid);
 630                 if (skb) {
 631                         *hlid = wl->system_hlid;
 632                         wl->last_wlvif = NULL;
 633                 }
 634         }
 635
 636         /* Do a new pass over the wlvif list. But no need to continue
 637          * after last_wlvif. The previous pass should have found it. */
 638         if (!skb) {
 639                 wl12xx_for_each_wlvif(wl, wlvif) {
 640                         if (!wlvif->tx_queue_count[ac])
 641                                 goto next;
 642
 643                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 644                                                            &low_prio_hlid);
 645                         if (skb) {
 646                                 wl->last_wlvif = wlvif;
 647                                 break;
 648                         }
 649
 650 next:
 651                         if (wlvif == wl->last_wlvif)
 652                                 break;
 653                 }
 654         }
 655
 656         /* no high priority skbs found - but maybe a low priority one? */
 657         if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
 658                 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
 659                 skb = wlcore_lnk_dequeue(wl, lnk, ac);
 660
 661                 WARN_ON(!skb); /* we checked this before */
 662                 *hlid = low_prio_hlid;
 663
 664                 /* ensure proper round robin in the vif/link levels */
 665                 wl->last_wlvif = lnk->wlvif;
 666                 if (lnk->wlvif)
 667                         lnk->wlvif->last_tx_hlid = low_prio_hlid;
 668
 669         }
 670
 671 out:
 672         if (!skb &&
 673             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 674                 int q;
 675
 676                 skb = wl->dummy_packet;
 677                 *hlid = wl->system_hlid;
 678                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 679                 spin_lock_irqsave(&wl->wl_lock, flags);
 680                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 681                 wl->tx_queue_count[q]--;
 682                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 683         }
 684
 685         return skb;
 686 }
 687
 688 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 689                                   struct sk_buff *skb, u8 hlid)
 690 {
 691         unsigned long flags;
 692         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 693
 694         if (wl12xx_is_dummy_packet(wl, skb)) {
 695                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 696         } else {
 697                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 698
 699                 /* make sure we dequeue the same packet next time */
 700                 wlvif->last_tx_hlid = (hlid + wl->num_links - 1) %
 701                                       wl->num_links;
 702         }
 703
 704         spin_lock_irqsave(&wl->wl_lock, flags);
 705         wl->tx_queue_count[q]++;
 706         if (wlvif)
 707                 wlvif->tx_queue_count[q]++;
 708         spin_unlock_irqrestore(&wl->wl_lock, flags);
 709 }
 710
 711 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 712 {
 713         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 714
 715         return ieee80211_is_data_present(hdr->frame_control);
 716 }
 717
 718 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 719 {
 720         struct wl12xx_vif *wlvif;
 721         u32 timeout;
 722         u8 hlid;
 723
 724         if (!wl->conf.rx_streaming.interval)
 725                 return;
 726
 727         if (!wl->conf.rx_streaming.always &&
 728             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 729                 return;
 730
 731         timeout = wl->conf.rx_streaming.duration;
 732         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 733                 bool found = false;
 734                 for_each_set_bit(hlid, active_hlids, wl->num_links) {
 735                         if (test_bit(hlid, wlvif->links_map)) {
 736                                 found  = true;
 737                                 break;
 738                         }
 739                 }
 740
 741                 if (!found)
 742                         continue;
 743
 744                 /* enable rx streaming */
 745                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 746                         ieee80211_queue_work(wl->hw,
 747                                              &wlvif->rx_streaming_enable_work);
 748
 749                 mod_timer(&wlvif->rx_streaming_timer,
 750                           jiffies + msecs_to_jiffies(timeout));
 751         }
 752 }
 753
 754 /*
 755  * Returns failure values only in case of failed bus ops within this function.
 756  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
 757  * triggering recovery by higher layers when not necessary.
 758  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
 759  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
 760  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
 761  * within prepare_tx_frame code but there's nothing we should do about those
 762  * as well.
 763  */
 764 int wlcore_tx_work_locked(struct wl1271 *wl)
 765 {
 766         struct wl12xx_vif *wlvif;
 767         struct sk_buff *skb;
 768         struct wl1271_tx_hw_descr *desc;
 769         u32 buf_offset = 0, last_len = 0;
 770         bool sent_packets = false;
 771         unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 772         int ret = 0;
 773         int bus_ret = 0;
 774         u8 hlid;
 775
 776         if (unlikely(wl->state != WLCORE_STATE_ON))
 777                 return 0;
 778
 779         while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
 780                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 781                 bool has_data = false;
 782
 783                 wlvif = NULL;
 784                 if (!wl12xx_is_dummy_packet(wl, skb))
 785                         wlvif = wl12xx_vif_to_data(info->control.vif);
 786                 else
 787                         hlid = wl->system_hlid;
 788
 789                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 790                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
 791                                               hlid);
 792                 if (ret == -EAGAIN) {
 793                         /*
 794                          * Aggregation buffer is full.
 795                          * Flush buffer and try again.
 796                          */
 797                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 798
 799                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 800                                                             last_len);
 801                         bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
 802                                              wl->aggr_buf, buf_offset, true);
 803                         if (bus_ret < 0)
 804                                 goto out;
 805
 806                         sent_packets = true;
 807                         buf_offset = 0;
 808                         continue;
 809                 } else if (ret == -EBUSY) {
 810                         /*
 811                          * Firmware buffer is full.
 812                          * Queue back last skb, and stop aggregating.
 813                          */
 814                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 815                         /* No work left, avoid scheduling redundant tx work */
 816                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 817                         goto out_ack;
 818                 } else if (ret < 0) {
 819                         if (wl12xx_is_dummy_packet(wl, skb))
 820                                 /*
 821                                  * fw still expects dummy packet,
 822                                  * so re-enqueue it
 823                                  */
 824                                 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 825                         else
 826                                 ieee80211_free_txskb(wl->hw, skb);
 827                         goto out_ack;
 828                 }
 829                 last_len = ret;
 830                 buf_offset += last_len;
 831                 wl->tx_packets_count++;
 832                 if (has_data) {
 833                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 834                         __set_bit(desc->hlid, active_hlids);
 835                 }
 836         }
 837
 838 out_ack:
 839         if (buf_offset) {
 840                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 841                 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 842                                              buf_offset, true);
 843                 if (bus_ret < 0)
 844                         goto out;
 845
 846                 sent_packets = true;
 847         }
 848         if (sent_packets) {
 849                 /*
 850                  * Interrupt the firmware with the new packets. This is only
 851                  * required for older hardware revisions
 852                  */
 853                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 854                         bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
 855                                              wl->tx_packets_count);
 856                         if (bus_ret < 0)
 857                                 goto out;
 858                 }
 859
 860                 wl1271_handle_tx_low_watermark(wl);
 861         }
 862         wl12xx_rearm_rx_streaming(wl, active_hlids);
 863
 864 out:
 865         return bus_ret;
 866 }
 867
 868 void wl1271_tx_work(struct work_struct *work)
 869 {
 870         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 871         int ret;
 872
 873         mutex_lock(&wl->mutex);
 874         ret = wl1271_ps_elp_wakeup(wl);
 875         if (ret < 0)
 876                 goto out;
 877
 878         ret = wlcore_tx_work_locked(wl);
 879         if (ret < 0) {
 880                 wl12xx_queue_recovery_work(wl);
 881                 goto out;
 882         }
 883
 884         wl1271_ps_elp_sleep(wl);
 885 out:
 886         mutex_unlock(&wl->mutex);
 887 }
 888
 889 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 890 {
 891         u8 flags = 0;
 892
 893         /*
 894          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 895          * only it uses Tx-completion.
 896          */
 897         if (rate_class_index <= 8)
 898                 flags |= IEEE80211_TX_RC_MCS;
 899
 900         /*
 901          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 902          * only it uses Tx-completion.
 903          */
 904         if (rate_class_index == 0)
 905                 flags |= IEEE80211_TX_RC_SHORT_GI;
 906
 907         return flags;
 908 }
 909
 910 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 911                                       struct wl1271_tx_hw_res_descr *result)
 912 {
 913         struct ieee80211_tx_info *info;
 914         struct ieee80211_vif *vif;
 915         struct wl12xx_vif *wlvif;
 916         struct sk_buff *skb;
 917         int id = result->id;
 918         int rate = -1;
 919         u8 rate_flags = 0;
 920         u8 retries = 0;
 921
 922         /* check for id legality */
 923         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 924                 wl1271_warning("TX result illegal id: %d", id);
 925                 return;
 926         }
 927
 928         skb = wl->tx_frames[id];
 929         info = IEEE80211_SKB_CB(skb);
 930
 931         if (wl12xx_is_dummy_packet(wl, skb)) {
 932                 wl1271_free_tx_id(wl, id);
 933                 return;
 934         }
 935
 936         /* info->control is valid as long as we don't update info->status */
 937         vif = info->control.vif;
 938         wlvif = wl12xx_vif_to_data(vif);
 939
 940         /* update the TX status info */
 941         if (result->status == TX_SUCCESS) {
 942                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 943                         info->flags |= IEEE80211_TX_STAT_ACK;
 944                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 945                                           wlvif->band);
 946                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 947                 retries = result->ack_failures;
 948         } else if (result->status == TX_RETRY_EXCEEDED) {
 949                 wl->stats.excessive_retries++;
 950                 retries = result->ack_failures;
 951         }
 952
 953         info->status.rates[0].idx = rate;
 954         info->status.rates[0].count = retries;
 955         info->status.rates[0].flags = rate_flags;
 956         info->status.ack_signal = -1;
 957
 958         wl->stats.retry_count += result->ack_failures;
 959
 960         /* remove private header from packet */
 961         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 962
 963         /* remove TKIP header space if present */
 964         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 965             info->control.hw_key &&
 966             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 967                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 968                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 969                         hdrlen);
 970                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 971         }
 972
 973         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 974                      " status 0x%x",
 975                      result->id, skb, result->ack_failures,
 976                      result->rate_class_index, result->status);
 977
 978         /* return the packet to the stack */
 979         skb_queue_tail(&wl->deferred_tx_queue, skb);
 980         queue_work(wl->freezable_wq, &wl->netstack_work);
 981         wl1271_free_tx_id(wl, result->id);
 982 }
 983
 984 /* Called upon reception of a TX complete interrupt */
 985 int wlcore_tx_complete(struct wl1271 *wl)
 986 {
 987         struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
 988         u32 count, fw_counter;
 989         u32 i;
 990         int ret;
 991
 992         /* read the tx results from the chipset */
 993         ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
 994                           wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 995         if (ret < 0)
 996                 goto out;
 997
 998         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 999
1000         /* write host counter to chipset (to ack) */
1001         ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
1002                              offsetof(struct wl1271_tx_hw_res_if,
1003                                       tx_result_host_counter), fw_counter);
1004         if (ret < 0)
1005                 goto out;
1006
1007         count = fw_counter - wl->tx_results_count;
1008         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
1009
1010         /* verify that the result buffer is not getting overrun */
1011         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1012                 wl1271_warning("TX result overflow from chipset: %d", count);
1013
1014         /* process the results */
1015         for (i = 0; i < count; i++) {
1016                 struct wl1271_tx_hw_res_descr *result;
1017                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1018
1019                 /* process the packet */
1020                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
1021                 wl1271_tx_complete_packet(wl, result);
1022
1023                 wl->tx_results_count++;
1024         }
1025
1026 out:
1027         return ret;
1028 }
1029 EXPORT_SYMBOL(wlcore_tx_complete);
1030
1031 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1032 {
1033         struct sk_buff *skb;
1034         int i;
1035         unsigned long flags;
1036         struct ieee80211_tx_info *info;
1037         int total[NUM_TX_QUEUES];
1038         struct wl1271_link *lnk = &wl->links[hlid];
1039
1040         for (i = 0; i < NUM_TX_QUEUES; i++) {
1041                 total[i] = 0;
1042                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1043                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1044
1045                         if (!wl12xx_is_dummy_packet(wl, skb)) {
1046                                 info = IEEE80211_SKB_CB(skb);
1047                                 info->status.rates[0].idx = -1;
1048                                 info->status.rates[0].count = 0;
1049                                 ieee80211_tx_status_ni(wl->hw, skb);
1050                         }
1051
1052                         total[i]++;
1053                 }
1054         }
1055
1056         spin_lock_irqsave(&wl->wl_lock, flags);
1057         for (i = 0; i < NUM_TX_QUEUES; i++) {
1058                 wl->tx_queue_count[i] -= total[i];
1059                 if (lnk->wlvif)
1060                         lnk->wlvif->tx_queue_count[i] -= total[i];
1061         }
1062         spin_unlock_irqrestore(&wl->wl_lock, flags);
1063
1064         wl1271_handle_tx_low_watermark(wl);
1065 }
1066
1067 /* caller must hold wl->mutex and TX must be stopped */
1068 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1069 {
1070         int i;
1071
1072         /* TX failure */
1073         for_each_set_bit(i, wlvif->links_map, wl->num_links) {
1074                 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1075                     i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1076                         /* this calls wl12xx_free_link */
1077                         wl1271_free_sta(wl, wlvif, i);
1078                 } else {
1079                         u8 hlid = i;
1080                         wl12xx_free_link(wl, wlvif, &hlid);
1081                 }
1082         }
1083         wlvif->last_tx_hlid = 0;
1084
1085         for (i = 0; i < NUM_TX_QUEUES; i++)
1086                 wlvif->tx_queue_count[i] = 0;
1087 }
1088 /* caller must hold wl->mutex and TX must be stopped */
1089 void wl12xx_tx_reset(struct wl1271 *wl)
1090 {
1091         int i;
1092         struct sk_buff *skb;
1093         struct ieee80211_tx_info *info;
1094
1095         /* only reset the queues if something bad happened */
1096         if (wl1271_tx_total_queue_count(wl) != 0) {
1097                 for (i = 0; i < wl->num_links; i++)
1098                         wl1271_tx_reset_link_queues(wl, i);
1099
1100                 for (i = 0; i < NUM_TX_QUEUES; i++)
1101                         wl->tx_queue_count[i] = 0;
1102         }
1103
1104         /*
1105          * Make sure the driver is at a consistent state, in case this
1106          * function is called from a context other than interface removal.
1107          * This call will always wake the TX queues.
1108          */
1109         wl1271_handle_tx_low_watermark(wl);
1110
1111         for (i = 0; i < wl->num_tx_desc; i++) {
1112                 if (wl->tx_frames[i] == NULL)
1113                         continue;
1114
1115                 skb = wl->tx_frames[i];
1116                 wl1271_free_tx_id(wl, i);
1117                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1118
1119                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1120                         /*
1121                          * Remove private headers before passing the skb to
1122                          * mac80211
1123                          */
1124                         info = IEEE80211_SKB_CB(skb);
1125                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1126                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1127                             info->control.hw_key &&
1128                             info->control.hw_key->cipher ==
1129                             WLAN_CIPHER_SUITE_TKIP) {
1130                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1131                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1132                                         skb->data, hdrlen);
1133                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1134                         }
1135
1136                         info->status.rates[0].idx = -1;
1137                         info->status.rates[0].count = 0;
1138
1139                         ieee80211_tx_status_ni(wl->hw, skb);
1140                 }
1141         }
1142 }
1143
1144 #define WL1271_TX_FLUSH_TIMEOUT 500000
1145
1146 /* caller must *NOT* hold wl->mutex */
1147 void wl1271_tx_flush(struct wl1271 *wl)
1148 {
1149         unsigned long timeout, start_time;
1150         int i;
1151         start_time = jiffies;
1152         timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1153
1154         /* only one flush should be in progress, for consistent queue state */
1155         mutex_lock(&wl->flush_mutex);
1156
1157         mutex_lock(&wl->mutex);
1158         if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1159                 mutex_unlock(&wl->mutex);
1160                 goto out;
1161         }
1162
1163         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1164
1165         while (!time_after(jiffies, timeout)) {
1166                 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1167                              wl->tx_frames_cnt,
1168                              wl1271_tx_total_queue_count(wl));
1169
1170                 /* force Tx and give the driver some time to flush data */
1171                 mutex_unlock(&wl->mutex);
1172                 if (wl1271_tx_total_queue_count(wl))
1173                         wl1271_tx_work(&wl->tx_work);
1174                 msleep(20);
1175                 mutex_lock(&wl->mutex);
1176
1177                 if ((wl->tx_frames_cnt == 0) &&
1178                     (wl1271_tx_total_queue_count(wl) == 0)) {
1179                         wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1180                                      jiffies_to_msecs(jiffies - start_time));
1181                         goto out_wake;
1182                 }
1183         }
1184
1185         wl1271_warning("Unable to flush all TX buffers, "
1186                        "timed out (timeout %d ms",
1187                        WL1271_TX_FLUSH_TIMEOUT / 1000);
1188
1189         /* forcibly flush all Tx buffers on our queues */
1190         for (i = 0; i < wl->num_links; i++)
1191                 wl1271_tx_reset_link_queues(wl, i);
1192
1193 out_wake:
1194         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1195         mutex_unlock(&wl->mutex);
1196 out:
1197         mutex_unlock(&wl->flush_mutex);
1198 }
1199 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1200
1201 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1202 {
1203         if (WARN_ON(!rate_set))
1204                 return 0;
1205
1206         return BIT(__ffs(rate_set));
1207 }
1208 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1209
1210 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1211                               u8 queue, enum wlcore_queue_stop_reason reason)
1212 {
1213         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1214         bool stopped = !!wl->queue_stop_reasons[hwq];
1215
1216         /* queue should not be stopped for this reason */
1217         WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1218
1219         if (stopped)
1220                 return;
1221
1222         ieee80211_stop_queue(wl->hw, hwq);
1223 }
1224
1225 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1226                        enum wlcore_queue_stop_reason reason)
1227 {
1228         unsigned long flags;
1229
1230         spin_lock_irqsave(&wl->wl_lock, flags);
1231         wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1232         spin_unlock_irqrestore(&wl->wl_lock, flags);
1233 }
1234
1235 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1236                        enum wlcore_queue_stop_reason reason)
1237 {
1238         unsigned long flags;
1239         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1240
1241         spin_lock_irqsave(&wl->wl_lock, flags);
1242
1243         /* queue should not be clear for this reason */
1244         WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1245
1246         if (wl->queue_stop_reasons[hwq])
1247                 goto out;
1248
1249         ieee80211_wake_queue(wl->hw, hwq);
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         unsigned long flags;
1260
1261         spin_lock_irqsave(&wl->wl_lock, flags);
1262
1263         /* mark all possible queues as stopped */
1264         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1265                 WARN_ON_ONCE(test_and_set_bit(reason,
1266                                               &wl->queue_stop_reasons[i]));
1267
1268         /* use the global version to make sure all vifs in mac80211 we don't
1269          * know are stopped.
1270          */
1271         ieee80211_stop_queues(wl->hw);
1272
1273         spin_unlock_irqrestore(&wl->wl_lock, flags);
1274 }
1275
1276 void wlcore_wake_queues(struct wl1271 *wl,
1277                         enum wlcore_queue_stop_reason reason)
1278 {
1279         int i;
1280         unsigned long flags;
1281
1282         spin_lock_irqsave(&wl->wl_lock, flags);
1283
1284         /* mark all possible queues as awake */
1285         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1286                 WARN_ON_ONCE(!test_and_clear_bit(reason,
1287                                                  &wl->queue_stop_reasons[i]));
1288
1289         /* use the global version to make sure all vifs in mac80211 we don't
1290          * know are woken up.
1291          */
1292         ieee80211_wake_queues(wl->hw);
1293
1294         spin_unlock_irqrestore(&wl->wl_lock, flags);
1295 }
1296
1297 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1298                                        struct wl12xx_vif *wlvif, u8 queue,
1299                                        enum wlcore_queue_stop_reason reason)
1300 {
1301         unsigned long flags;
1302         bool stopped;
1303
1304         spin_lock_irqsave(&wl->wl_lock, flags);
1305         stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1306                                                            reason);
1307         spin_unlock_irqrestore(&wl->wl_lock, flags);
1308
1309         return stopped;
1310 }
1311
1312 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1313                                        struct wl12xx_vif *wlvif, u8 queue,
1314                                        enum wlcore_queue_stop_reason reason)
1315 {
1316         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1317
1318         assert_spin_locked(&wl->wl_lock);
1319         return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1320 }
1321
1322 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1323                                     u8 queue)
1324 {
1325         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1326
1327         assert_spin_locked(&wl->wl_lock);
1328         return !!wl->queue_stop_reasons[hwq];
1329 }