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 = skb_push(skb, total_len - skb->len);
 227
 228                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 229                                              spare_blocks);
 230
 231                 desc->id = id;
 232
 233                 wl->tx_blocks_available -= total_blocks;
 234                 wl->tx_allocated_blocks += total_blocks;
 235
 236                 /*
 237                  * If the FW was empty before, arm the Tx watchdog. Also do
 238                  * this on the first Tx after resume, as we always cancel the
 239                  * watchdog on suspend.
 240                  */
 241                 if (wl->tx_allocated_blocks == total_blocks ||
 242                     test_and_clear_bit(WL1271_FLAG_REINIT_TX_WDOG, &wl->flags))
 243                         wl12xx_rearm_tx_watchdog_locked(wl);
 244
 245                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 246                 wl->tx_allocated_pkts[ac]++;
 247
 248                 if (test_bit(hlid, wl->links_map))
 249                         wl->links[hlid].allocated_pkts++;
 250
 251                 ret = 0;
 252
 253                 wl1271_debug(DEBUG_TX,
 254                              "tx_allocate: size: %d, blocks: %d, id: %d",
 255                              total_len, total_blocks, id);
 256         } else {
 257                 wl1271_free_tx_id(wl, id);
 258         }
 259
 260         return ret;
 261 }
 262
 263 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 264                                struct sk_buff *skb, u32 extra,
 265                                struct ieee80211_tx_info *control, u8 hlid)
 266 {
 267         struct timespec ts;
 268         struct wl1271_tx_hw_descr *desc;
 269         int ac, rate_idx;
 270         s64 hosttime;
 271         u16 tx_attr = 0;
 272         __le16 frame_control;
 273         struct ieee80211_hdr *hdr;
 274         u8 *frame_start;
 275         bool is_dummy;
 276
 277         desc = (struct wl1271_tx_hw_descr *) skb->data;
 278         frame_start = (u8 *)(desc + 1);
 279         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 280         frame_control = hdr->frame_control;
 281
 282         /* relocate space for security header */
 283         if (extra) {
 284                 int hdrlen = ieee80211_hdrlen(frame_control);
 285                 memmove(frame_start, hdr, hdrlen);
 286                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 287         }
 288
 289         /* configure packet life time */
 290         getnstimeofday(&ts);
 291         hosttime = (timespec_to_ns(&ts) >> 10);
 292         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 293
 294         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 295         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 296                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 297         else
 298                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 299
 300         /* queue */
 301         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 302         desc->tid = skb->priority;
 303
 304         if (is_dummy) {
 305                 /*
 306                  * FW expects the dummy packet to have an invalid session id -
 307                  * any session id that is different than the one set in the join
 308                  */
 309                 tx_attr = (SESSION_COUNTER_INVALID <<
 310                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 311                            TX_HW_ATTR_SESSION_COUNTER;
 312
 313                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 314         } else if (wlvif) {
 315                 u8 session_id = wl->session_ids[hlid];
 316
 317                 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
 318                     (wlvif->bss_type == BSS_TYPE_AP_BSS))
 319                         session_id = 0;
 320
 321                 /* configure the tx attributes */
 322                 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
 323         }
 324
 325         desc->hlid = hlid;
 326         if (is_dummy || !wlvif)
 327                 rate_idx = 0;
 328         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 329                 /*
 330                  * if the packets are data packets
 331                  * send them with AP rate policies (EAPOLs are an exception),
 332                  * otherwise use default basic rates
 333                  */
 334                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 335                         rate_idx = wlvif->sta.basic_rate_idx;
 336                 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 337                         rate_idx = wlvif->sta.p2p_rate_idx;
 338                 else if (ieee80211_is_data(frame_control))
 339                         rate_idx = wlvif->sta.ap_rate_idx;
 340                 else
 341                         rate_idx = wlvif->sta.basic_rate_idx;
 342         } else {
 343                 if (hlid == wlvif->ap.global_hlid)
 344                         rate_idx = wlvif->ap.mgmt_rate_idx;
 345                 else if (hlid == wlvif->ap.bcast_hlid ||
 346                          skb->protocol == cpu_to_be16(ETH_P_PAE) ||
 347                          !ieee80211_is_data(frame_control))
 348                         /*
 349                          * send non-data, bcast and EAPOLs using the
 350                          * min basic rate
 351                          */
 352                         rate_idx = wlvif->ap.bcast_rate_idx;
 353                 else
 354                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 355         }
 356
 357         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 358
 359         /* for WEP shared auth - no fw encryption is needed */
 360         if (ieee80211_is_auth(frame_control) &&
 361             ieee80211_has_protected(frame_control))
 362                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 363
 364         /* send EAPOL frames as voice */
 365         if (control->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
 366                 tx_attr |= TX_HW_ATTR_EAPOL_FRAME;
 367
 368         desc->tx_attr = cpu_to_le16(tx_attr);
 369
 370         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 371         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 372 }
 373
 374 /* caller must hold wl->mutex */
 375 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 376                                    struct sk_buff *skb, u32 buf_offset, u8 hlid)
 377 {
 378         struct ieee80211_tx_info *info;
 379         u32 extra = 0;
 380         int ret = 0;
 381         u32 total_len;
 382         bool is_dummy;
 383         bool is_gem = false;
 384
 385         if (!skb) {
 386                 wl1271_error("discarding null skb");
 387                 return -EINVAL;
 388         }
 389
 390         if (hlid == WL12XX_INVALID_LINK_ID) {
 391                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 392                 return -EINVAL;
 393         }
 394
 395         info = IEEE80211_SKB_CB(skb);
 396
 397         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 398
 399         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 400             info->control.hw_key &&
 401             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 402                 extra = WL1271_EXTRA_SPACE_TKIP;
 403
 404         if (info->control.hw_key) {
 405                 bool is_wep;
 406                 u8 idx = info->control.hw_key->hw_key_idx;
 407                 u32 cipher = info->control.hw_key->cipher;
 408
 409                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 410                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 411
 412                 if (WARN_ON(is_wep && wlvif && wlvif->default_key != idx)) {
 413                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 414                         if (ret < 0)
 415                                 return ret;
 416                         wlvif->default_key = idx;
 417                 }
 418
 419                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 420         }
 421
 422         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 423                                  is_gem);
 424         if (ret < 0)
 425                 return ret;
 426
 427         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 428
 429         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 430                 wl1271_tx_ap_update_inconnection_sta(wl, wlvif, skb);
 431                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 432         }
 433
 434         /*
 435          * The length of each packet is stored in terms of
 436          * words. Thus, we must pad the skb data to make sure its
 437          * length is aligned.  The number of padding bytes is computed
 438          * and set in wl1271_tx_fill_hdr.
 439          * In special cases, we want to align to a specific block size
 440          * (eg. for wl128x with SDIO we align to 256).
 441          */
 442         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 443
 444         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 445         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 446
 447         /* Revert side effects in the dummy packet skb, so it can be reused */
 448         if (is_dummy)
 449                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 450
 451         return total_len;
 452 }
 453
 454 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 455                                 enum nl80211_band rate_band)
 456 {
 457         struct ieee80211_supported_band *band;
 458         u32 enabled_rates = 0;
 459         int bit;
 460
 461         band = wl->hw->wiphy->bands[rate_band];
 462         for (bit = 0; bit < band->n_bitrates; bit++) {
 463                 if (rate_set & 0x1)
 464                         enabled_rates |= band->bitrates[bit].hw_value;
 465                 rate_set >>= 1;
 466         }
 467
 468         /* MCS rates indication are on bits 16 - 31 */
 469         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 470
 471         for (bit = 0; bit < 16; bit++) {
 472                 if (rate_set & 0x1)
 473                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 474                 rate_set >>= 1;
 475         }
 476
 477         return enabled_rates;
 478 }
 479
 480 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 481 {
 482         int i;
 483         struct wl12xx_vif *wlvif;
 484
 485         wl12xx_for_each_wlvif(wl, wlvif) {
 486                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 487                         if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
 488                                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 489                             wlvif->tx_queue_count[i] <=
 490                                         WL1271_TX_QUEUE_LOW_WATERMARK)
 491                                 /* firmware buffer has space, restart queues */
 492                                 wlcore_wake_queue(wl, wlvif, i,
 493                                         WLCORE_QUEUE_STOP_REASON_WATERMARK);
 494                 }
 495         }
 496 }
 497
 498 static int wlcore_select_ac(struct wl1271 *wl)
 499 {
 500         int i, q = -1, ac;
 501         u32 min_pkts = 0xffffffff;
 502
 503         /*
 504          * Find a non-empty ac where:
 505          * 1. There are packets to transmit
 506          * 2. The FW has the least allocated blocks
 507          *
 508          * We prioritize the ACs according to VO>VI>BE>BK
 509          */
 510         for (i = 0; i < NUM_TX_QUEUES; i++) {
 511                 ac = wl1271_tx_get_queue(i);
 512                 if (wl->tx_queue_count[ac] &&
 513                     wl->tx_allocated_pkts[ac] < min_pkts) {
 514                         q = ac;
 515                         min_pkts = wl->tx_allocated_pkts[q];
 516                 }
 517         }
 518
 519         return q;
 520 }
 521
 522 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
 523                                           struct wl1271_link *lnk, u8 q)
 524 {
 525         struct sk_buff *skb;
 526         unsigned long flags;
 527
 528         skb = skb_dequeue(&lnk->tx_queue[q]);
 529         if (skb) {
 530                 spin_lock_irqsave(&wl->wl_lock, flags);
 531                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 532                 wl->tx_queue_count[q]--;
 533                 if (lnk->wlvif) {
 534                         WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
 535                         lnk->wlvif->tx_queue_count[q]--;
 536                 }
 537                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 538         }
 539
 540         return skb;
 541 }
 542
 543 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
 544                                                     u8 hlid, u8 ac,
 545                                                     u8 *low_prio_hlid)
 546 {
 547         struct wl1271_link *lnk = &wl->links[hlid];
 548
 549         if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
 550                 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
 551                     !skb_queue_empty(&lnk->tx_queue[ac]) &&
 552                     wlcore_hw_lnk_low_prio(wl, hlid, lnk))
 553                         /* we found the first non-empty low priority queue */
 554                         *low_prio_hlid = hlid;
 555
 556                 return NULL;
 557         }
 558
 559         return wlcore_lnk_dequeue(wl, lnk, ac);
 560 }
 561
 562 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
 563                                                     struct wl12xx_vif *wlvif,
 564                                                     u8 ac, u8 *hlid,
 565                                                     u8 *low_prio_hlid)
 566 {
 567         struct sk_buff *skb = NULL;
 568         int i, h, start_hlid;
 569
 570         /* start from the link after the last one */
 571         start_hlid = (wlvif->last_tx_hlid + 1) % wl->num_links;
 572
 573         /* dequeue according to AC, round robin on each link */
 574         for (i = 0; i < wl->num_links; i++) {
 575                 h = (start_hlid + i) % wl->num_links;
 576
 577                 /* only consider connected stations */
 578                 if (!test_bit(h, wlvif->links_map))
 579                         continue;
 580
 581                 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
 582                                                    low_prio_hlid);
 583                 if (!skb)
 584                         continue;
 585
 586                 wlvif->last_tx_hlid = h;
 587                 break;
 588         }
 589
 590         if (!skb)
 591                 wlvif->last_tx_hlid = 0;
 592
 593         *hlid = wlvif->last_tx_hlid;
 594         return skb;
 595 }
 596
 597 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
 598 {
 599         unsigned long flags;
 600         struct wl12xx_vif *wlvif = wl->last_wlvif;
 601         struct sk_buff *skb = NULL;
 602         int ac;
 603         u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
 604
 605         ac = wlcore_select_ac(wl);
 606         if (ac < 0)
 607                 goto out;
 608
 609         /* continue from last wlvif (round robin) */
 610         if (wlvif) {
 611                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 612                         if (!wlvif->tx_queue_count[ac])
 613                                 continue;
 614
 615                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 616                                                            &low_prio_hlid);
 617                         if (!skb)
 618                                 continue;
 619
 620                         wl->last_wlvif = wlvif;
 621                         break;
 622                 }
 623         }
 624
 625         /* dequeue from the system HLID before the restarting wlvif list */
 626         if (!skb) {
 627                 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
 628                                                    ac, &low_prio_hlid);
 629                 if (skb) {
 630                         *hlid = wl->system_hlid;
 631                         wl->last_wlvif = NULL;
 632                 }
 633         }
 634
 635         /* Do a new pass over the wlvif list. But no need to continue
 636          * after last_wlvif. The previous pass should have found it. */
 637         if (!skb) {
 638                 wl12xx_for_each_wlvif(wl, wlvif) {
 639                         if (!wlvif->tx_queue_count[ac])
 640                                 goto next;
 641
 642                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 643                                                            &low_prio_hlid);
 644                         if (skb) {
 645                                 wl->last_wlvif = wlvif;
 646                                 break;
 647                         }
 648
 649 next:
 650                         if (wlvif == wl->last_wlvif)
 651                                 break;
 652                 }
 653         }
 654
 655         /* no high priority skbs found - but maybe a low priority one? */
 656         if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
 657                 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
 658                 skb = wlcore_lnk_dequeue(wl, lnk, ac);
 659
 660                 WARN_ON(!skb); /* we checked this before */
 661                 *hlid = low_prio_hlid;
 662
 663                 /* ensure proper round robin in the vif/link levels */
 664                 wl->last_wlvif = lnk->wlvif;
 665                 if (lnk->wlvif)
 666                         lnk->wlvif->last_tx_hlid = low_prio_hlid;
 667
 668         }
 669
 670 out:
 671         if (!skb &&
 672             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 673                 int q;
 674
 675                 skb = wl->dummy_packet;
 676                 *hlid = wl->system_hlid;
 677                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 678                 spin_lock_irqsave(&wl->wl_lock, flags);
 679                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 680                 wl->tx_queue_count[q]--;
 681                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 682         }
 683
 684         return skb;
 685 }
 686
 687 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 688                                   struct sk_buff *skb, u8 hlid)
 689 {
 690         unsigned long flags;
 691         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 692
 693         if (wl12xx_is_dummy_packet(wl, skb)) {
 694                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 695         } else {
 696                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 697
 698                 /* make sure we dequeue the same packet next time */
 699                 wlvif->last_tx_hlid = (hlid + wl->num_links - 1) %
 700                                       wl->num_links;
 701         }
 702
 703         spin_lock_irqsave(&wl->wl_lock, flags);
 704         wl->tx_queue_count[q]++;
 705         if (wlvif)
 706                 wlvif->tx_queue_count[q]++;
 707         spin_unlock_irqrestore(&wl->wl_lock, flags);
 708 }
 709
 710 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 711 {
 712         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 713
 714         return ieee80211_is_data_present(hdr->frame_control);
 715 }
 716
 717 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 718 {
 719         struct wl12xx_vif *wlvif;
 720         u32 timeout;
 721         u8 hlid;
 722
 723         if (!wl->conf.rx_streaming.interval)
 724                 return;
 725
 726         if (!wl->conf.rx_streaming.always &&
 727             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 728                 return;
 729
 730         timeout = wl->conf.rx_streaming.duration;
 731         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 732                 bool found = false;
 733                 for_each_set_bit(hlid, active_hlids, wl->num_links) {
 734                         if (test_bit(hlid, wlvif->links_map)) {
 735                                 found  = true;
 736                                 break;
 737                         }
 738                 }
 739
 740                 if (!found)
 741                         continue;
 742
 743                 /* enable rx streaming */
 744                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 745                         ieee80211_queue_work(wl->hw,
 746                                              &wlvif->rx_streaming_enable_work);
 747
 748                 mod_timer(&wlvif->rx_streaming_timer,
 749                           jiffies + msecs_to_jiffies(timeout));
 750         }
 751 }
 752
 753 /*
 754  * Returns failure values only in case of failed bus ops within this function.
 755  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
 756  * triggering recovery by higher layers when not necessary.
 757  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
 758  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
 759  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
 760  * within prepare_tx_frame code but there's nothing we should do about those
 761  * as well.
 762  */
 763 int wlcore_tx_work_locked(struct wl1271 *wl)
 764 {
 765         struct wl12xx_vif *wlvif;
 766         struct sk_buff *skb;
 767         struct wl1271_tx_hw_descr *desc;
 768         u32 buf_offset = 0, last_len = 0;
 769         bool sent_packets = false;
 770         unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 771         int ret = 0;
 772         int bus_ret = 0;
 773         u8 hlid;
 774
 775         if (unlikely(wl->state != WLCORE_STATE_ON))
 776                 return 0;
 777
 778         while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
 779                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 780                 bool has_data = false;
 781
 782                 wlvif = NULL;
 783                 if (!wl12xx_is_dummy_packet(wl, skb))
 784                         wlvif = wl12xx_vif_to_data(info->control.vif);
 785                 else
 786                         hlid = wl->system_hlid;
 787
 788                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 789                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
 790                                               hlid);
 791                 if (ret == -EAGAIN) {
 792                         /*
 793                          * Aggregation buffer is full.
 794                          * Flush buffer and try again.
 795                          */
 796                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 797
 798                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 799                                                             last_len);
 800                         bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
 801                                              wl->aggr_buf, buf_offset, true);
 802                         if (bus_ret < 0)
 803                                 goto out;
 804
 805                         sent_packets = true;
 806                         buf_offset = 0;
 807                         continue;
 808                 } else if (ret == -EBUSY) {
 809                         /*
 810                          * Firmware buffer is full.
 811                          * Queue back last skb, and stop aggregating.
 812                          */
 813                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 814                         /* No work left, avoid scheduling redundant tx work */
 815                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 816                         goto out_ack;
 817                 } else if (ret < 0) {
 818                         if (wl12xx_is_dummy_packet(wl, skb))
 819                                 /*
 820                                  * fw still expects dummy packet,
 821                                  * so re-enqueue it
 822                                  */
 823                                 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 824                         else
 825                                 ieee80211_free_txskb(wl->hw, skb);
 826                         goto out_ack;
 827                 }
 828                 last_len = ret;
 829                 buf_offset += last_len;
 830                 wl->tx_packets_count++;
 831                 if (has_data) {
 832                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 833                         __set_bit(desc->hlid, active_hlids);
 834                 }
 835         }
 836
 837 out_ack:
 838         if (buf_offset) {
 839                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 840                 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 841                                              buf_offset, true);
 842                 if (bus_ret < 0)
 843                         goto out;
 844
 845                 sent_packets = true;
 846         }
 847         if (sent_packets) {
 848                 /*
 849                  * Interrupt the firmware with the new packets. This is only
 850                  * required for older hardware revisions
 851                  */
 852                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 853                         bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
 854                                              wl->tx_packets_count);
 855                         if (bus_ret < 0)
 856                                 goto out;
 857                 }
 858
 859                 wl1271_handle_tx_low_watermark(wl);
 860         }
 861         wl12xx_rearm_rx_streaming(wl, active_hlids);
 862
 863 out:
 864         return bus_ret;
 865 }
 866
 867 void wl1271_tx_work(struct work_struct *work)
 868 {
 869         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 870         int ret;
 871
 872         mutex_lock(&wl->mutex);
 873         ret = wl1271_ps_elp_wakeup(wl);
 874         if (ret < 0)
 875                 goto out;
 876
 877         ret = wlcore_tx_work_locked(wl);
 878         if (ret < 0) {
 879                 wl12xx_queue_recovery_work(wl);
 880                 goto out;
 881         }
 882
 883         wl1271_ps_elp_sleep(wl);
 884 out:
 885         mutex_unlock(&wl->mutex);
 886 }
 887
 888 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 889 {
 890         u8 flags = 0;
 891
 892         /*
 893          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 894          * only it uses Tx-completion.
 895          */
 896         if (rate_class_index <= 8)
 897                 flags |= IEEE80211_TX_RC_MCS;
 898
 899         /*
 900          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 901          * only it uses Tx-completion.
 902          */
 903         if (rate_class_index == 0)
 904                 flags |= IEEE80211_TX_RC_SHORT_GI;
 905
 906         return flags;
 907 }
 908
 909 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 910                                       struct wl1271_tx_hw_res_descr *result)
 911 {
 912         struct ieee80211_tx_info *info;
 913         struct ieee80211_vif *vif;
 914         struct wl12xx_vif *wlvif;
 915         struct sk_buff *skb;
 916         int id = result->id;
 917         int rate = -1;
 918         u8 rate_flags = 0;
 919         u8 retries = 0;
 920
 921         /* check for id legality */
 922         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 923                 wl1271_warning("TX result illegal id: %d", id);
 924                 return;
 925         }
 926
 927         skb = wl->tx_frames[id];
 928         info = IEEE80211_SKB_CB(skb);
 929
 930         if (wl12xx_is_dummy_packet(wl, skb)) {
 931                 wl1271_free_tx_id(wl, id);
 932                 return;
 933         }
 934
 935         /* info->control is valid as long as we don't update info->status */
 936         vif = info->control.vif;
 937         wlvif = wl12xx_vif_to_data(vif);
 938
 939         /* update the TX status info */
 940         if (result->status == TX_SUCCESS) {
 941                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 942                         info->flags |= IEEE80211_TX_STAT_ACK;
 943                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 944                                           wlvif->band);
 945                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 946                 retries = result->ack_failures;
 947         } else if (result->status == TX_RETRY_EXCEEDED) {
 948                 wl->stats.excessive_retries++;
 949                 retries = result->ack_failures;
 950         }
 951
 952         info->status.rates[0].idx = rate;
 953         info->status.rates[0].count = retries;
 954         info->status.rates[0].flags = rate_flags;
 955         info->status.ack_signal = -1;
 956
 957         wl->stats.retry_count += result->ack_failures;
 958
 959         /* remove private header from packet */
 960         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 961
 962         /* remove TKIP header space if present */
 963         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 964             info->control.hw_key &&
 965             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 966                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 967                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 968                         hdrlen);
 969                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 970         }
 971
 972         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 973                      " status 0x%x",
 974                      result->id, skb, result->ack_failures,
 975                      result->rate_class_index, result->status);
 976
 977         /* return the packet to the stack */
 978         skb_queue_tail(&wl->deferred_tx_queue, skb);
 979         queue_work(wl->freezable_wq, &wl->netstack_work);
 980         wl1271_free_tx_id(wl, result->id);
 981 }
 982
 983 /* Called upon reception of a TX complete interrupt */
 984 int wlcore_tx_complete(struct wl1271 *wl)
 985 {
 986         struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
 987         u32 count, fw_counter;
 988         u32 i;
 989         int ret;
 990
 991         /* read the tx results from the chipset */
 992         ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
 993                           wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 994         if (ret < 0)
 995                 goto out;
 996
 997         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 998
 999         /* write host counter to chipset (to ack) */
1000         ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
1001                              offsetof(struct wl1271_tx_hw_res_if,
1002                                       tx_result_host_counter), fw_counter);
1003         if (ret < 0)
1004                 goto out;
1005
1006         count = fw_counter - wl->tx_results_count;
1007         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
1008
1009         /* verify that the result buffer is not getting overrun */
1010         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1011                 wl1271_warning("TX result overflow from chipset: %d", count);
1012
1013         /* process the results */
1014         for (i = 0; i < count; i++) {
1015                 struct wl1271_tx_hw_res_descr *result;
1016                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1017
1018                 /* process the packet */
1019                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
1020                 wl1271_tx_complete_packet(wl, result);
1021
1022                 wl->tx_results_count++;
1023         }
1024
1025 out:
1026         return ret;
1027 }
1028 EXPORT_SYMBOL(wlcore_tx_complete);
1029
1030 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1031 {
1032         struct sk_buff *skb;
1033         int i;
1034         unsigned long flags;
1035         struct ieee80211_tx_info *info;
1036         int total[NUM_TX_QUEUES];
1037         struct wl1271_link *lnk = &wl->links[hlid];
1038
1039         for (i = 0; i < NUM_TX_QUEUES; i++) {
1040                 total[i] = 0;
1041                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1042                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1043
1044                         if (!wl12xx_is_dummy_packet(wl, skb)) {
1045                                 info = IEEE80211_SKB_CB(skb);
1046                                 info->status.rates[0].idx = -1;
1047                                 info->status.rates[0].count = 0;
1048                                 ieee80211_tx_status_ni(wl->hw, skb);
1049                         }
1050
1051                         total[i]++;
1052                 }
1053         }
1054
1055         spin_lock_irqsave(&wl->wl_lock, flags);
1056         for (i = 0; i < NUM_TX_QUEUES; i++) {
1057                 wl->tx_queue_count[i] -= total[i];
1058                 if (lnk->wlvif)
1059                         lnk->wlvif->tx_queue_count[i] -= total[i];
1060         }
1061         spin_unlock_irqrestore(&wl->wl_lock, flags);
1062
1063         wl1271_handle_tx_low_watermark(wl);
1064 }
1065
1066 /* caller must hold wl->mutex and TX must be stopped */
1067 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1068 {
1069         int i;
1070
1071         /* TX failure */
1072         for_each_set_bit(i, wlvif->links_map, wl->num_links) {
1073                 if (wlvif->bss_type == BSS_TYPE_AP_BSS &&
1074                     i != wlvif->ap.bcast_hlid && i != wlvif->ap.global_hlid) {
1075                         /* this calls wl12xx_free_link */
1076                         wl1271_free_sta(wl, wlvif, i);
1077                 } else {
1078                         u8 hlid = i;
1079                         wl12xx_free_link(wl, wlvif, &hlid);
1080                 }
1081         }
1082         wlvif->last_tx_hlid = 0;
1083
1084         for (i = 0; i < NUM_TX_QUEUES; i++)
1085                 wlvif->tx_queue_count[i] = 0;
1086 }
1087 /* caller must hold wl->mutex and TX must be stopped */
1088 void wl12xx_tx_reset(struct wl1271 *wl)
1089 {
1090         int i;
1091         struct sk_buff *skb;
1092         struct ieee80211_tx_info *info;
1093
1094         /* only reset the queues if something bad happened */
1095         if (wl1271_tx_total_queue_count(wl) != 0) {
1096                 for (i = 0; i < wl->num_links; i++)
1097                         wl1271_tx_reset_link_queues(wl, i);
1098
1099                 for (i = 0; i < NUM_TX_QUEUES; i++)
1100                         wl->tx_queue_count[i] = 0;
1101         }
1102
1103         /*
1104          * Make sure the driver is at a consistent state, in case this
1105          * function is called from a context other than interface removal.
1106          * This call will always wake the TX queues.
1107          */
1108         wl1271_handle_tx_low_watermark(wl);
1109
1110         for (i = 0; i < wl->num_tx_desc; i++) {
1111                 if (wl->tx_frames[i] == NULL)
1112                         continue;
1113
1114                 skb = wl->tx_frames[i];
1115                 wl1271_free_tx_id(wl, i);
1116                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1117
1118                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1119                         /*
1120                          * Remove private headers before passing the skb to
1121                          * mac80211
1122                          */
1123                         info = IEEE80211_SKB_CB(skb);
1124                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1125                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1126                             info->control.hw_key &&
1127                             info->control.hw_key->cipher ==
1128                             WLAN_CIPHER_SUITE_TKIP) {
1129                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1130                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1131                                         skb->data, hdrlen);
1132                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1133                         }
1134
1135                         info->status.rates[0].idx = -1;
1136                         info->status.rates[0].count = 0;
1137
1138                         ieee80211_tx_status_ni(wl->hw, skb);
1139                 }
1140         }
1141 }
1142
1143 #define WL1271_TX_FLUSH_TIMEOUT 500000
1144
1145 /* caller must *NOT* hold wl->mutex */
1146 void wl1271_tx_flush(struct wl1271 *wl)
1147 {
1148         unsigned long timeout, start_time;
1149         int i;
1150         start_time = jiffies;
1151         timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1152
1153         /* only one flush should be in progress, for consistent queue state */
1154         mutex_lock(&wl->flush_mutex);
1155
1156         mutex_lock(&wl->mutex);
1157         if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1158                 mutex_unlock(&wl->mutex);
1159                 goto out;
1160         }
1161
1162         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1163
1164         while (!time_after(jiffies, timeout)) {
1165                 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1166                              wl->tx_frames_cnt,
1167                              wl1271_tx_total_queue_count(wl));
1168
1169                 /* force Tx and give the driver some time to flush data */
1170                 mutex_unlock(&wl->mutex);
1171                 if (wl1271_tx_total_queue_count(wl))
1172                         wl1271_tx_work(&wl->tx_work);
1173                 msleep(20);
1174                 mutex_lock(&wl->mutex);
1175
1176                 if ((wl->tx_frames_cnt == 0) &&
1177                     (wl1271_tx_total_queue_count(wl) == 0)) {
1178                         wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1179                                      jiffies_to_msecs(jiffies - start_time));
1180                         goto out_wake;
1181                 }
1182         }
1183
1184         wl1271_warning("Unable to flush all TX buffers, "
1185                        "timed out (timeout %d ms",
1186                        WL1271_TX_FLUSH_TIMEOUT / 1000);
1187
1188         /* forcibly flush all Tx buffers on our queues */
1189         for (i = 0; i < wl->num_links; i++)
1190                 wl1271_tx_reset_link_queues(wl, i);
1191
1192 out_wake:
1193         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1194         mutex_unlock(&wl->mutex);
1195 out:
1196         mutex_unlock(&wl->flush_mutex);
1197 }
1198 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1199
1200 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1201 {
1202         if (WARN_ON(!rate_set))
1203                 return 0;
1204
1205         return BIT(__ffs(rate_set));
1206 }
1207 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1208
1209 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1210                               u8 queue, enum wlcore_queue_stop_reason reason)
1211 {
1212         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1213         bool stopped = !!wl->queue_stop_reasons[hwq];
1214
1215         /* queue should not be stopped for this reason */
1216         WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1217
1218         if (stopped)
1219                 return;
1220
1221         ieee80211_stop_queue(wl->hw, hwq);
1222 }
1223
1224 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1225                        enum wlcore_queue_stop_reason reason)
1226 {
1227         unsigned long flags;
1228
1229         spin_lock_irqsave(&wl->wl_lock, flags);
1230         wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1231         spin_unlock_irqrestore(&wl->wl_lock, flags);
1232 }
1233
1234 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1235                        enum wlcore_queue_stop_reason reason)
1236 {
1237         unsigned long flags;
1238         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1239
1240         spin_lock_irqsave(&wl->wl_lock, flags);
1241
1242         /* queue should not be clear for this reason */
1243         WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1244
1245         if (wl->queue_stop_reasons[hwq])
1246                 goto out;
1247
1248         ieee80211_wake_queue(wl->hw, hwq);
1249
1250 out:
1251         spin_unlock_irqrestore(&wl->wl_lock, flags);
1252 }
1253
1254 void wlcore_stop_queues(struct wl1271 *wl,
1255                         enum wlcore_queue_stop_reason reason)
1256 {
1257         int i;
1258         unsigned long flags;
1259
1260         spin_lock_irqsave(&wl->wl_lock, flags);
1261
1262         /* mark all possible queues as stopped */
1263         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1264                 WARN_ON_ONCE(test_and_set_bit(reason,
1265                                               &wl->queue_stop_reasons[i]));
1266
1267         /* use the global version to make sure all vifs in mac80211 we don't
1268          * know are stopped.
1269          */
1270         ieee80211_stop_queues(wl->hw);
1271
1272         spin_unlock_irqrestore(&wl->wl_lock, flags);
1273 }
1274
1275 void wlcore_wake_queues(struct wl1271 *wl,
1276                         enum wlcore_queue_stop_reason reason)
1277 {
1278         int i;
1279         unsigned long flags;
1280
1281         spin_lock_irqsave(&wl->wl_lock, flags);
1282
1283         /* mark all possible queues as awake */
1284         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1285                 WARN_ON_ONCE(!test_and_clear_bit(reason,
1286                                                  &wl->queue_stop_reasons[i]));
1287
1288         /* use the global version to make sure all vifs in mac80211 we don't
1289          * know are woken up.
1290          */
1291         ieee80211_wake_queues(wl->hw);
1292
1293         spin_unlock_irqrestore(&wl->wl_lock, flags);
1294 }
1295
1296 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1297                                        struct wl12xx_vif *wlvif, u8 queue,
1298                                        enum wlcore_queue_stop_reason reason)
1299 {
1300         unsigned long flags;
1301         bool stopped;
1302
1303         spin_lock_irqsave(&wl->wl_lock, flags);
1304         stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1305                                                            reason);
1306         spin_unlock_irqrestore(&wl->wl_lock, flags);
1307
1308         return stopped;
1309 }
1310
1311 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1312                                        struct wl12xx_vif *wlvif, u8 queue,
1313                                        enum wlcore_queue_stop_reason reason)
1314 {
1315         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1316
1317         assert_spin_locked(&wl->wl_lock);
1318         return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1319 }
1320
1321 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1322                                     u8 queue)
1323 {
1324         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1325
1326         assert_spin_locked(&wl->wl_lock);
1327         return !!wl->queue_stop_reasons[hwq];
1328 }