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

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/etherdevice.h>
  27
  28 #include "wlcore.h"
  29 #include "debug.h"
  30 #include "io.h"
  31 #include "ps.h"
  32 #include "tx.h"
  33 #include "event.h"
  34 #include "hw_ops.h"
  35
  36 /*
  37  * TODO: this is here just for now, it must be removed when the data
  38  * operations are in place.
  39  */
  40 #include "../wl12xx/reg.h"
  41
  42 static int wl1271_set_default_wep_key(struct wl1271 *wl,
  43                                       struct wl12xx_vif *wlvif, u8 id)
  44 {
  45         int ret;
  46         bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
  47
  48         if (is_ap)
  49                 ret = wl12xx_cmd_set_default_wep_key(wl, id,
  50                                                      wlvif->ap.bcast_hlid);
  51         else
  52                 ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
  53
  54         if (ret < 0)
  55                 return ret;
  56
  57         wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
  58         return 0;
  59 }
  60
  61 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
  62 {
  63         int id;
  64
  65         id = find_first_zero_bit(wl->tx_frames_map, wl->num_tx_desc);
  66         if (id >= wl->num_tx_desc)
  67                 return -EBUSY;
  68
  69         __set_bit(id, wl->tx_frames_map);
  70         wl->tx_frames[id] = skb;
  71         wl->tx_frames_cnt++;
  72         return id;
  73 }
  74
  75 void wl1271_free_tx_id(struct wl1271 *wl, int id)
  76 {
  77         if (__test_and_clear_bit(id, wl->tx_frames_map)) {
  78                 if (unlikely(wl->tx_frames_cnt == wl->num_tx_desc))
  79                         clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
  80
  81                 wl->tx_frames[id] = NULL;
  82                 wl->tx_frames_cnt--;
  83         }
  84 }
  85 EXPORT_SYMBOL(wl1271_free_tx_id);
  86
  87 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  88                                                  struct sk_buff *skb)
  89 {
  90         struct ieee80211_hdr *hdr;
  91
  92         /*
  93          * add the station to the known list before transmitting the
  94          * authentication response. this way it won't get de-authed by FW
  95          * when transmitting too soon.
  96          */
  97         hdr = (struct ieee80211_hdr *)(skb->data +
  98                                        sizeof(struct wl1271_tx_hw_descr));
  99         if (ieee80211_is_auth(hdr->frame_control))
 100                 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
 101 }
 102
 103 static void wl1271_tx_regulate_link(struct wl1271 *wl,
 104                                     struct wl12xx_vif *wlvif,
 105                                     u8 hlid)
 106 {
 107         bool fw_ps, single_link;
 108         u8 tx_pkts;
 109
 110         if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
 111                 return;
 112
 113         fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
 114         tx_pkts = wl->links[hlid].allocated_pkts;
 115         single_link = (wl->active_link_count == 1);
 116
 117         /*
 118          * if in FW PS and there is enough data in FW we can put the link
 119          * into high-level PS and clean out its TX queues.
 120          * Make an exception if this is the only connected link. In this
 121          * case FW-memory congestion is less of a problem.
 122          */
 123         if (!single_link && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 124                 wl12xx_ps_link_start(wl, wlvif, hlid, true);
 125 }
 126
 127 bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
 128 {
 129         return wl->dummy_packet == skb;
 130 }
 131 EXPORT_SYMBOL(wl12xx_is_dummy_packet);
 132
 133 static u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 134                                 struct sk_buff *skb, struct ieee80211_sta *sta)
 135 {
 136         if (sta) {
 137                 struct wl1271_station *wl_sta;
 138
 139                 wl_sta = (struct wl1271_station *)sta->drv_priv;
 140                 return wl_sta->hlid;
 141         } else {
 142                 struct ieee80211_hdr *hdr;
 143
 144                 if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
 145                         return wl->system_hlid;
 146
 147                 hdr = (struct ieee80211_hdr *)skb->data;
 148                 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 149                         return wlvif->ap.bcast_hlid;
 150                 else
 151                         return wlvif->ap.global_hlid;
 152         }
 153 }
 154
 155 u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 156                       struct sk_buff *skb, struct ieee80211_sta *sta)
 157 {
 158         struct ieee80211_tx_info *control;
 159
 160         if (wlvif->bss_type == BSS_TYPE_AP_BSS)
 161                 return wl12xx_tx_get_hlid_ap(wl, wlvif, skb, sta);
 162
 163         control = IEEE80211_SKB_CB(skb);
 164         if (control->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
 165                 wl1271_debug(DEBUG_TX, "tx offchannel");
 166                 return wlvif->dev_hlid;
 167         }
 168
 169         return wlvif->sta.hlid;
 170 }
 171
 172 unsigned int wlcore_calc_packet_alignment(struct wl1271 *wl,
 173                                           unsigned int packet_length)
 174 {
 175         if ((wl->quirks & WLCORE_QUIRK_TX_PAD_LAST_FRAME) ||
 176             !(wl->quirks & WLCORE_QUIRK_TX_BLOCKSIZE_ALIGN))
 177                 return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
 178         else
 179                 return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
 180 }
 181 EXPORT_SYMBOL(wlcore_calc_packet_alignment);
 182
 183 static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 184                               struct sk_buff *skb, u32 extra, u32 buf_offset,
 185                               u8 hlid, bool is_gem)
 186 {
 187         struct wl1271_tx_hw_descr *desc;
 188         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 189         u32 total_blocks;
 190         int id, ret = -EBUSY, ac;
 191         u32 spare_blocks;
 192
 193         if (buf_offset + total_len > wl->aggr_buf_size)
 194                 return -EAGAIN;
 195
 196         spare_blocks = wlcore_hw_get_spare_blocks(wl, is_gem);
 197
 198         /* allocate free identifier for the packet */
 199         id = wl1271_alloc_tx_id(wl, skb);
 200         if (id < 0)
 201                 return id;
 202
 203         total_blocks = wlcore_hw_calc_tx_blocks(wl, total_len, spare_blocks);
 204
 205         if (total_blocks <= wl->tx_blocks_available) {
 206                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 207                         skb, total_len - skb->len);
 208
 209                 wlcore_hw_set_tx_desc_blocks(wl, desc, total_blocks,
 210                                              spare_blocks);
 211
 212                 desc->id = id;
 213
 214                 wl->tx_blocks_available -= total_blocks;
 215                 wl->tx_allocated_blocks += total_blocks;
 216
 217                 /* If the FW was empty before, arm the Tx watchdog */
 218                 if (wl->tx_allocated_blocks == total_blocks)
 219                         wl12xx_rearm_tx_watchdog_locked(wl);
 220
 221                 ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 222                 wl->tx_allocated_pkts[ac]++;
 223
 224                 if (test_bit(hlid, wl->links_map))
 225                         wl->links[hlid].allocated_pkts++;
 226
 227                 ret = 0;
 228
 229                 wl1271_debug(DEBUG_TX,
 230                              "tx_allocate: size: %d, blocks: %d, id: %d",
 231                              total_len, total_blocks, id);
 232         } else {
 233                 wl1271_free_tx_id(wl, id);
 234         }
 235
 236         return ret;
 237 }
 238
 239 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 240                                struct sk_buff *skb, u32 extra,
 241                                struct ieee80211_tx_info *control, u8 hlid)
 242 {
 243         struct timespec ts;
 244         struct wl1271_tx_hw_descr *desc;
 245         int ac, rate_idx;
 246         s64 hosttime;
 247         u16 tx_attr = 0;
 248         __le16 frame_control;
 249         struct ieee80211_hdr *hdr;
 250         u8 *frame_start;
 251         bool is_dummy;
 252
 253         desc = (struct wl1271_tx_hw_descr *) skb->data;
 254         frame_start = (u8 *)(desc + 1);
 255         hdr = (struct ieee80211_hdr *)(frame_start + extra);
 256         frame_control = hdr->frame_control;
 257
 258         /* relocate space for security header */
 259         if (extra) {
 260                 int hdrlen = ieee80211_hdrlen(frame_control);
 261                 memmove(frame_start, hdr, hdrlen);
 262                 skb_set_network_header(skb, skb_network_offset(skb) + extra);
 263         }
 264
 265         /* configure packet life time */
 266         getnstimeofday(&ts);
 267         hosttime = (timespec_to_ns(&ts) >> 10);
 268         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 269
 270         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 271         if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
 272                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 273         else
 274                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 275
 276         /* queue */
 277         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 278         desc->tid = skb->priority;
 279
 280         if (is_dummy) {
 281                 /*
 282                  * FW expects the dummy packet to have an invalid session id -
 283                  * any session id that is different than the one set in the join
 284                  */
 285                 tx_attr = (SESSION_COUNTER_INVALID <<
 286                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 287                            TX_HW_ATTR_SESSION_COUNTER;
 288
 289                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 290         } else if (wlvif) {
 291                 u8 session_id = wl->session_ids[hlid];
 292
 293                 if ((wl->quirks & WLCORE_QUIRK_AP_ZERO_SESSION_ID) &&
 294                     (wlvif->bss_type == BSS_TYPE_AP_BSS))
 295                         session_id = 0;
 296
 297                 /* configure the tx attributes */
 298                 tx_attr = session_id << TX_HW_ATTR_OFST_SESSION_COUNTER;
 299         }
 300
 301         desc->hlid = hlid;
 302         if (is_dummy || !wlvif)
 303                 rate_idx = 0;
 304         else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 305                 /*
 306                  * if the packets are data packets
 307                  * send them with AP rate policies (EAPOLs are an exception),
 308                  * otherwise use default basic rates
 309                  */
 310                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 311                         rate_idx = wlvif->sta.basic_rate_idx;
 312                 else if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 313                         rate_idx = wlvif->sta.p2p_rate_idx;
 314                 else if (ieee80211_is_data(frame_control))
 315                         rate_idx = wlvif->sta.ap_rate_idx;
 316                 else
 317                         rate_idx = wlvif->sta.basic_rate_idx;
 318         } else {
 319                 if (hlid == wlvif->ap.global_hlid)
 320                         rate_idx = wlvif->ap.mgmt_rate_idx;
 321                 else if (hlid == wlvif->ap.bcast_hlid ||
 322                          skb->protocol == cpu_to_be16(ETH_P_PAE) ||
 323                          !ieee80211_is_data(frame_control))
 324                         /*
 325                          * send non-data, bcast and EAPOLs using the
 326                          * min basic rate
 327                          */
 328                         rate_idx = wlvif->ap.bcast_rate_idx;
 329                 else
 330                         rate_idx = wlvif->ap.ucast_rate_idx[ac];
 331         }
 332
 333         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 334
 335         /* for WEP shared auth - no fw encryption is needed */
 336         if (ieee80211_is_auth(frame_control) &&
 337             ieee80211_has_protected(frame_control))
 338                 tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
 339
 340         desc->tx_attr = cpu_to_le16(tx_attr);
 341
 342         wlcore_hw_set_tx_desc_csum(wl, desc, skb);
 343         wlcore_hw_set_tx_desc_data_len(wl, desc, skb);
 344 }
 345
 346 /* caller must hold wl->mutex */
 347 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 348                                    struct sk_buff *skb, u32 buf_offset, u8 hlid)
 349 {
 350         struct ieee80211_tx_info *info;
 351         u32 extra = 0;
 352         int ret = 0;
 353         u32 total_len;
 354         bool is_dummy;
 355         bool is_gem = false;
 356
 357         if (!skb) {
 358                 wl1271_error("discarding null skb");
 359                 return -EINVAL;
 360         }
 361
 362         if (hlid == WL12XX_INVALID_LINK_ID) {
 363                 wl1271_error("invalid hlid. dropping skb 0x%p", skb);
 364                 return -EINVAL;
 365         }
 366
 367         info = IEEE80211_SKB_CB(skb);
 368
 369         is_dummy = wl12xx_is_dummy_packet(wl, skb);
 370
 371         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 372             info->control.hw_key &&
 373             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 374                 extra = WL1271_EXTRA_SPACE_TKIP;
 375
 376         if (info->control.hw_key) {
 377                 bool is_wep;
 378                 u8 idx = info->control.hw_key->hw_key_idx;
 379                 u32 cipher = info->control.hw_key->cipher;
 380
 381                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 382                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 383
 384                 if (unlikely(is_wep && wlvif->default_key != idx)) {
 385                         ret = wl1271_set_default_wep_key(wl, wlvif, idx);
 386                         if (ret < 0)
 387                                 return ret;
 388                         wlvif->default_key = idx;
 389                 }
 390
 391                 is_gem = (cipher == WL1271_CIPHER_SUITE_GEM);
 392         }
 393
 394         ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid,
 395                                  is_gem);
 396         if (ret < 0)
 397                 return ret;
 398
 399         wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
 400
 401         if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
 402                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 403                 wl1271_tx_regulate_link(wl, wlvif, hlid);
 404         }
 405
 406         /*
 407          * The length of each packet is stored in terms of
 408          * words. Thus, we must pad the skb data to make sure its
 409          * length is aligned.  The number of padding bytes is computed
 410          * and set in wl1271_tx_fill_hdr.
 411          * In special cases, we want to align to a specific block size
 412          * (eg. for wl128x with SDIO we align to 256).
 413          */
 414         total_len = wlcore_calc_packet_alignment(wl, skb->len);
 415
 416         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 417         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 418
 419         /* Revert side effects in the dummy packet skb, so it can be reused */
 420         if (is_dummy)
 421                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 422
 423         return total_len;
 424 }
 425
 426 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
 427                                 enum ieee80211_band rate_band)
 428 {
 429         struct ieee80211_supported_band *band;
 430         u32 enabled_rates = 0;
 431         int bit;
 432
 433         band = wl->hw->wiphy->bands[rate_band];
 434         for (bit = 0; bit < band->n_bitrates; bit++) {
 435                 if (rate_set & 0x1)
 436                         enabled_rates |= band->bitrates[bit].hw_value;
 437                 rate_set >>= 1;
 438         }
 439
 440         /* MCS rates indication are on bits 16 - 31 */
 441         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 442
 443         for (bit = 0; bit < 16; bit++) {
 444                 if (rate_set & 0x1)
 445                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 446                 rate_set >>= 1;
 447         }
 448
 449         return enabled_rates;
 450 }
 451
 452 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 453 {
 454         int i;
 455         struct wl12xx_vif *wlvif;
 456
 457         wl12xx_for_each_wlvif(wl, wlvif) {
 458                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 459                         if (wlcore_is_queue_stopped_by_reason(wl, wlvif, i,
 460                                         WLCORE_QUEUE_STOP_REASON_WATERMARK) &&
 461                             wlvif->tx_queue_count[i] <=
 462                                         WL1271_TX_QUEUE_LOW_WATERMARK)
 463                                 /* firmware buffer has space, restart queues */
 464                                 wlcore_wake_queue(wl, wlvif, i,
 465                                         WLCORE_QUEUE_STOP_REASON_WATERMARK);
 466                 }
 467         }
 468 }
 469
 470 static int wlcore_select_ac(struct wl1271 *wl)
 471 {
 472         int i, q = -1, ac;
 473         u32 min_pkts = 0xffffffff;
 474
 475         /*
 476          * Find a non-empty ac where:
 477          * 1. There are packets to transmit
 478          * 2. The FW has the least allocated blocks
 479          *
 480          * We prioritize the ACs according to VO>VI>BE>BK
 481          */
 482         for (i = 0; i < NUM_TX_QUEUES; i++) {
 483                 ac = wl1271_tx_get_queue(i);
 484                 if (wl->tx_queue_count[ac] &&
 485                     wl->tx_allocated_pkts[ac] < min_pkts) {
 486                         q = ac;
 487                         min_pkts = wl->tx_allocated_pkts[q];
 488                 }
 489         }
 490
 491         return q;
 492 }
 493
 494 static struct sk_buff *wlcore_lnk_dequeue(struct wl1271 *wl,
 495                                           struct wl1271_link *lnk, u8 q)
 496 {
 497         struct sk_buff *skb;
 498         unsigned long flags;
 499
 500         skb = skb_dequeue(&lnk->tx_queue[q]);
 501         if (skb) {
 502                 spin_lock_irqsave(&wl->wl_lock, flags);
 503                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 504                 wl->tx_queue_count[q]--;
 505                 if (lnk->wlvif) {
 506                         WARN_ON_ONCE(lnk->wlvif->tx_queue_count[q] <= 0);
 507                         lnk->wlvif->tx_queue_count[q]--;
 508                 }
 509                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 510         }
 511
 512         return skb;
 513 }
 514
 515 static struct sk_buff *wlcore_lnk_dequeue_high_prio(struct wl1271 *wl,
 516                                                     u8 hlid, u8 ac,
 517                                                     u8 *low_prio_hlid)
 518 {
 519         struct wl1271_link *lnk = &wl->links[hlid];
 520
 521         if (!wlcore_hw_lnk_high_prio(wl, hlid, lnk)) {
 522                 if (*low_prio_hlid == WL12XX_INVALID_LINK_ID &&
 523                     !skb_queue_empty(&lnk->tx_queue[ac]) &&
 524                     wlcore_hw_lnk_low_prio(wl, hlid, lnk))
 525                         /* we found the first non-empty low priority queue */
 526                         *low_prio_hlid = hlid;
 527
 528                 return NULL;
 529         }
 530
 531         return wlcore_lnk_dequeue(wl, lnk, ac);
 532 }
 533
 534 static struct sk_buff *wlcore_vif_dequeue_high_prio(struct wl1271 *wl,
 535                                                     struct wl12xx_vif *wlvif,
 536                                                     u8 ac, u8 *hlid,
 537                                                     u8 *low_prio_hlid)
 538 {
 539         struct sk_buff *skb = NULL;
 540         int i, h, start_hlid;
 541
 542         /* start from the link after the last one */
 543         start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
 544
 545         /* dequeue according to AC, round robin on each link */
 546         for (i = 0; i < WL12XX_MAX_LINKS; i++) {
 547                 h = (start_hlid + i) % WL12XX_MAX_LINKS;
 548
 549                 /* only consider connected stations */
 550                 if (!test_bit(h, wlvif->links_map))
 551                         continue;
 552
 553                 skb = wlcore_lnk_dequeue_high_prio(wl, h, ac,
 554                                                    low_prio_hlid);
 555                 if (!skb)
 556                         continue;
 557
 558                 wlvif->last_tx_hlid = h;
 559                 break;
 560         }
 561
 562         if (!skb)
 563                 wlvif->last_tx_hlid = 0;
 564
 565         *hlid = wlvif->last_tx_hlid;
 566         return skb;
 567 }
 568
 569 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl, u8 *hlid)
 570 {
 571         unsigned long flags;
 572         struct wl12xx_vif *wlvif = wl->last_wlvif;
 573         struct sk_buff *skb = NULL;
 574         int ac;
 575         u8 low_prio_hlid = WL12XX_INVALID_LINK_ID;
 576
 577         ac = wlcore_select_ac(wl);
 578         if (ac < 0)
 579                 goto out;
 580
 581         /* continue from last wlvif (round robin) */
 582         if (wlvif) {
 583                 wl12xx_for_each_wlvif_continue(wl, wlvif) {
 584                         if (!wlvif->tx_queue_count[ac])
 585                                 continue;
 586
 587                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 588                                                            &low_prio_hlid);
 589                         if (!skb)
 590                                 continue;
 591
 592                         wl->last_wlvif = wlvif;
 593                         break;
 594                 }
 595         }
 596
 597         /* dequeue from the system HLID before the restarting wlvif list */
 598         if (!skb) {
 599                 skb = wlcore_lnk_dequeue_high_prio(wl, wl->system_hlid,
 600                                                    ac, &low_prio_hlid);
 601                 if (skb) {
 602                         *hlid = wl->system_hlid;
 603                         wl->last_wlvif = NULL;
 604                 }
 605         }
 606
 607         /* Do a new pass over the wlvif list. But no need to continue
 608          * after last_wlvif. The previous pass should have found it. */
 609         if (!skb) {
 610                 wl12xx_for_each_wlvif(wl, wlvif) {
 611                         if (!wlvif->tx_queue_count[ac])
 612                                 goto next;
 613
 614                         skb = wlcore_vif_dequeue_high_prio(wl, wlvif, ac, hlid,
 615                                                            &low_prio_hlid);
 616                         if (skb) {
 617                                 wl->last_wlvif = wlvif;
 618                                 break;
 619                         }
 620
 621 next:
 622                         if (wlvif == wl->last_wlvif)
 623                                 break;
 624                 }
 625         }
 626
 627         /* no high priority skbs found - but maybe a low priority one? */
 628         if (!skb && low_prio_hlid != WL12XX_INVALID_LINK_ID) {
 629                 struct wl1271_link *lnk = &wl->links[low_prio_hlid];
 630                 skb = wlcore_lnk_dequeue(wl, lnk, ac);
 631
 632                 WARN_ON(!skb); /* we checked this before */
 633                 *hlid = low_prio_hlid;
 634
 635                 /* ensure proper round robin in the vif/link levels */
 636                 wl->last_wlvif = lnk->wlvif;
 637                 if (lnk->wlvif)
 638                         lnk->wlvif->last_tx_hlid = low_prio_hlid;
 639
 640         }
 641
 642         if (!skb &&
 643             test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
 644                 int q;
 645
 646                 skb = wl->dummy_packet;
 647                 *hlid = wl->system_hlid;
 648                 q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 649                 spin_lock_irqsave(&wl->wl_lock, flags);
 650                 WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
 651                 wl->tx_queue_count[q]--;
 652                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 653         }
 654
 655 out:
 656         return skb;
 657 }
 658
 659 static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
 660                                   struct sk_buff *skb, u8 hlid)
 661 {
 662         unsigned long flags;
 663         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 664
 665         if (wl12xx_is_dummy_packet(wl, skb)) {
 666                 set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
 667         } else {
 668                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 669
 670                 /* make sure we dequeue the same packet next time */
 671                 wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
 672                                       WL12XX_MAX_LINKS;
 673         }
 674
 675         spin_lock_irqsave(&wl->wl_lock, flags);
 676         wl->tx_queue_count[q]++;
 677         if (wlvif)
 678                 wlvif->tx_queue_count[q]++;
 679         spin_unlock_irqrestore(&wl->wl_lock, flags);
 680 }
 681
 682 static bool wl1271_tx_is_data_present(struct sk_buff *skb)
 683 {
 684         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
 685
 686         return ieee80211_is_data_present(hdr->frame_control);
 687 }
 688
 689 void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
 690 {
 691         struct wl12xx_vif *wlvif;
 692         u32 timeout;
 693         u8 hlid;
 694
 695         if (!wl->conf.rx_streaming.interval)
 696                 return;
 697
 698         if (!wl->conf.rx_streaming.always &&
 699             !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
 700                 return;
 701
 702         timeout = wl->conf.rx_streaming.duration;
 703         wl12xx_for_each_wlvif_sta(wl, wlvif) {
 704                 bool found = false;
 705                 for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
 706                         if (test_bit(hlid, wlvif->links_map)) {
 707                                 found  = true;
 708                                 break;
 709                         }
 710                 }
 711
 712                 if (!found)
 713                         continue;
 714
 715                 /* enable rx streaming */
 716                 if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
 717                         ieee80211_queue_work(wl->hw,
 718                                              &wlvif->rx_streaming_enable_work);
 719
 720                 mod_timer(&wlvif->rx_streaming_timer,
 721                           jiffies + msecs_to_jiffies(timeout));
 722         }
 723 }
 724
 725 /*
 726  * Returns failure values only in case of failed bus ops within this function.
 727  * wl1271_prepare_tx_frame retvals won't be returned in order to avoid
 728  * triggering recovery by higher layers when not necessary.
 729  * In case a FW command fails within wl1271_prepare_tx_frame fails a recovery
 730  * will be queued in wl1271_cmd_send. -EAGAIN/-EBUSY from prepare_tx_frame
 731  * can occur and are legitimate so don't propagate. -EINVAL will emit a WARNING
 732  * within prepare_tx_frame code but there's nothing we should do about those
 733  * as well.
 734  */
 735 int wlcore_tx_work_locked(struct wl1271 *wl)
 736 {
 737         struct wl12xx_vif *wlvif;
 738         struct sk_buff *skb;
 739         struct wl1271_tx_hw_descr *desc;
 740         u32 buf_offset = 0, last_len = 0;
 741         bool sent_packets = false;
 742         unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
 743         int ret = 0;
 744         int bus_ret = 0;
 745         u8 hlid;
 746
 747         if (unlikely(wl->state != WLCORE_STATE_ON))
 748                 return 0;
 749
 750         while ((skb = wl1271_skb_dequeue(wl, &hlid))) {
 751                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 752                 bool has_data = false;
 753
 754                 wlvif = NULL;
 755                 if (!wl12xx_is_dummy_packet(wl, skb))
 756                         wlvif = wl12xx_vif_to_data(info->control.vif);
 757                 else
 758                         hlid = wl->system_hlid;
 759
 760                 has_data = wlvif && wl1271_tx_is_data_present(skb);
 761                 ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset,
 762                                               hlid);
 763                 if (ret == -EAGAIN) {
 764                         /*
 765                          * Aggregation buffer is full.
 766                          * Flush buffer and try again.
 767                          */
 768                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 769
 770                         buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset,
 771                                                             last_len);
 772                         bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA,
 773                                              wl->aggr_buf, buf_offset, true);
 774                         if (bus_ret < 0)
 775                                 goto out;
 776
 777                         sent_packets = true;
 778                         buf_offset = 0;
 779                         continue;
 780                 } else if (ret == -EBUSY) {
 781                         /*
 782                          * Firmware buffer is full.
 783                          * Queue back last skb, and stop aggregating.
 784                          */
 785                         wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 786                         /* No work left, avoid scheduling redundant tx work */
 787                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 788                         goto out_ack;
 789                 } else if (ret < 0) {
 790                         if (wl12xx_is_dummy_packet(wl, skb))
 791                                 /*
 792                                  * fw still expects dummy packet,
 793                                  * so re-enqueue it
 794                                  */
 795                                 wl1271_skb_queue_head(wl, wlvif, skb, hlid);
 796                         else
 797                                 ieee80211_free_txskb(wl->hw, skb);
 798                         goto out_ack;
 799                 }
 800                 last_len = ret;
 801                 buf_offset += last_len;
 802                 wl->tx_packets_count++;
 803                 if (has_data) {
 804                         desc = (struct wl1271_tx_hw_descr *) skb->data;
 805                         __set_bit(desc->hlid, active_hlids);
 806                 }
 807         }
 808
 809 out_ack:
 810         if (buf_offset) {
 811                 buf_offset = wlcore_hw_pre_pkt_send(wl, buf_offset, last_len);
 812                 bus_ret = wlcore_write_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 813                                              buf_offset, true);
 814                 if (bus_ret < 0)
 815                         goto out;
 816
 817                 sent_packets = true;
 818         }
 819         if (sent_packets) {
 820                 /*
 821                  * Interrupt the firmware with the new packets. This is only
 822                  * required for older hardware revisions
 823                  */
 824                 if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 825                         bus_ret = wlcore_write32(wl, WL12XX_HOST_WR_ACCESS,
 826                                              wl->tx_packets_count);
 827                         if (bus_ret < 0)
 828                                 goto out;
 829                 }
 830
 831                 wl1271_handle_tx_low_watermark(wl);
 832         }
 833         wl12xx_rearm_rx_streaming(wl, active_hlids);
 834
 835 out:
 836         return bus_ret;
 837 }
 838
 839 void wl1271_tx_work(struct work_struct *work)
 840 {
 841         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 842         int ret;
 843
 844         mutex_lock(&wl->mutex);
 845         ret = wl1271_ps_elp_wakeup(wl);
 846         if (ret < 0)
 847                 goto out;
 848
 849         ret = wlcore_tx_work_locked(wl);
 850         if (ret < 0) {
 851                 wl12xx_queue_recovery_work(wl);
 852                 goto out;
 853         }
 854
 855         wl1271_ps_elp_sleep(wl);
 856 out:
 857         mutex_unlock(&wl->mutex);
 858 }
 859
 860 static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
 861 {
 862         u8 flags = 0;
 863
 864         /*
 865          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 866          * only it uses Tx-completion.
 867          */
 868         if (rate_class_index <= 8)
 869                 flags |= IEEE80211_TX_RC_MCS;
 870
 871         /*
 872          * TODO: use wl12xx constants when this code is moved to wl12xx, as
 873          * only it uses Tx-completion.
 874          */
 875         if (rate_class_index == 0)
 876                 flags |= IEEE80211_TX_RC_SHORT_GI;
 877
 878         return flags;
 879 }
 880
 881 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 882                                       struct wl1271_tx_hw_res_descr *result)
 883 {
 884         struct ieee80211_tx_info *info;
 885         struct ieee80211_vif *vif;
 886         struct wl12xx_vif *wlvif;
 887         struct sk_buff *skb;
 888         int id = result->id;
 889         int rate = -1;
 890         u8 rate_flags = 0;
 891         u8 retries = 0;
 892
 893         /* check for id legality */
 894         if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 895                 wl1271_warning("TX result illegal id: %d", id);
 896                 return;
 897         }
 898
 899         skb = wl->tx_frames[id];
 900         info = IEEE80211_SKB_CB(skb);
 901
 902         if (wl12xx_is_dummy_packet(wl, skb)) {
 903                 wl1271_free_tx_id(wl, id);
 904                 return;
 905         }
 906
 907         /* info->control is valid as long as we don't update info->status */
 908         vif = info->control.vif;
 909         wlvif = wl12xx_vif_to_data(vif);
 910
 911         /* update the TX status info */
 912         if (result->status == TX_SUCCESS) {
 913                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 914                         info->flags |= IEEE80211_TX_STAT_ACK;
 915                 rate = wlcore_rate_to_idx(wl, result->rate_class_index,
 916                                           wlvif->band);
 917                 rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
 918                 retries = result->ack_failures;
 919         } else if (result->status == TX_RETRY_EXCEEDED) {
 920                 wl->stats.excessive_retries++;
 921                 retries = result->ack_failures;
 922         }
 923
 924         info->status.rates[0].idx = rate;
 925         info->status.rates[0].count = retries;
 926         info->status.rates[0].flags = rate_flags;
 927         info->status.ack_signal = -1;
 928
 929         wl->stats.retry_count += result->ack_failures;
 930
 931         /*
 932          * update sequence number only when relevant, i.e. only in
 933          * sessions of TKIP, AES and GEM (not in open or WEP sessions)
 934          */
 935         if (info->control.hw_key &&
 936             (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
 937              info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
 938              info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
 939                 u8 fw_lsb = result->tx_security_sequence_number_lsb;
 940                 u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
 941
 942                 /*
 943                  * update security sequence number, taking care of potential
 944                  * wrap-around
 945                  */
 946                 wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
 947                 wlvif->tx_security_last_seq_lsb = fw_lsb;
 948         }
 949
 950         /* remove private header from packet */
 951         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 952
 953         /* remove TKIP header space if present */
 954         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
 955             info->control.hw_key &&
 956             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 957                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 958                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
 959                         hdrlen);
 960                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
 961         }
 962
 963         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 964                      " status 0x%x",
 965                      result->id, skb, result->ack_failures,
 966                      result->rate_class_index, result->status);
 967
 968         /* return the packet to the stack */
 969         skb_queue_tail(&wl->deferred_tx_queue, skb);
 970         queue_work(wl->freezable_wq, &wl->netstack_work);
 971         wl1271_free_tx_id(wl, result->id);
 972 }
 973
 974 /* Called upon reception of a TX complete interrupt */
 975 int wlcore_tx_complete(struct wl1271 *wl)
 976 {
 977         struct wl1271_acx_mem_map *memmap = wl->target_mem_map;
 978         u32 count, fw_counter;
 979         u32 i;
 980         int ret;
 981
 982         /* read the tx results from the chipset */
 983         ret = wlcore_read(wl, le32_to_cpu(memmap->tx_result),
 984                           wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 985         if (ret < 0)
 986                 goto out;
 987
 988         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 989
 990         /* write host counter to chipset (to ack) */
 991         ret = wlcore_write32(wl, le32_to_cpu(memmap->tx_result) +
 992                              offsetof(struct wl1271_tx_hw_res_if,
 993                                       tx_result_host_counter), fw_counter);
 994         if (ret < 0)
 995                 goto out;
 996
 997         count = fw_counter - wl->tx_results_count;
 998         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 999
1000         /* verify that the result buffer is not getting overrun */
1001         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
1002                 wl1271_warning("TX result overflow from chipset: %d", count);
1003
1004         /* process the results */
1005         for (i = 0; i < count; i++) {
1006                 struct wl1271_tx_hw_res_descr *result;
1007                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
1008
1009                 /* process the packet */
1010                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
1011                 wl1271_tx_complete_packet(wl, result);
1012
1013                 wl->tx_results_count++;
1014         }
1015
1016 out:
1017         return ret;
1018 }
1019 EXPORT_SYMBOL(wlcore_tx_complete);
1020
1021 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
1022 {
1023         struct sk_buff *skb;
1024         int i;
1025         unsigned long flags;
1026         struct ieee80211_tx_info *info;
1027         int total[NUM_TX_QUEUES];
1028         struct wl1271_link *lnk = &wl->links[hlid];
1029
1030         for (i = 0; i < NUM_TX_QUEUES; i++) {
1031                 total[i] = 0;
1032                 while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
1033                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
1034
1035                         if (!wl12xx_is_dummy_packet(wl, skb)) {
1036                                 info = IEEE80211_SKB_CB(skb);
1037                                 info->status.rates[0].idx = -1;
1038                                 info->status.rates[0].count = 0;
1039                                 ieee80211_tx_status_ni(wl->hw, skb);
1040                         }
1041
1042                         total[i]++;
1043                 }
1044         }
1045
1046         spin_lock_irqsave(&wl->wl_lock, flags);
1047         for (i = 0; i < NUM_TX_QUEUES; i++) {
1048                 wl->tx_queue_count[i] -= total[i];
1049                 if (lnk->wlvif)
1050                         lnk->wlvif->tx_queue_count[i] -= total[i];
1051         }
1052         spin_unlock_irqrestore(&wl->wl_lock, flags);
1053
1054         wl1271_handle_tx_low_watermark(wl);
1055 }
1056
1057 /* caller must hold wl->mutex and TX must be stopped */
1058 void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
1059 {
1060         int i;
1061
1062         /* TX failure */
1063         for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
1064                 if (wlvif->bss_type == BSS_TYPE_AP_BSS) {
1065                         /* this calls wl12xx_free_link */
1066                         wl1271_free_sta(wl, wlvif, i);
1067                 } else {
1068                         u8 hlid = i;
1069                         wl12xx_free_link(wl, wlvif, &hlid);
1070                 }
1071         }
1072         wlvif->last_tx_hlid = 0;
1073
1074         for (i = 0; i < NUM_TX_QUEUES; i++)
1075                 wlvif->tx_queue_count[i] = 0;
1076 }
1077 /* caller must hold wl->mutex and TX must be stopped */
1078 void wl12xx_tx_reset(struct wl1271 *wl)
1079 {
1080         int i;
1081         struct sk_buff *skb;
1082         struct ieee80211_tx_info *info;
1083
1084         /* only reset the queues if something bad happened */
1085         if (wl1271_tx_total_queue_count(wl) != 0) {
1086                 for (i = 0; i < WL12XX_MAX_LINKS; i++)
1087                         wl1271_tx_reset_link_queues(wl, i);
1088
1089                 for (i = 0; i < NUM_TX_QUEUES; i++)
1090                         wl->tx_queue_count[i] = 0;
1091         }
1092
1093         /*
1094          * Make sure the driver is at a consistent state, in case this
1095          * function is called from a context other than interface removal.
1096          * This call will always wake the TX queues.
1097          */
1098         wl1271_handle_tx_low_watermark(wl);
1099
1100         for (i = 0; i < wl->num_tx_desc; i++) {
1101                 if (wl->tx_frames[i] == NULL)
1102                         continue;
1103
1104                 skb = wl->tx_frames[i];
1105                 wl1271_free_tx_id(wl, i);
1106                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
1107
1108                 if (!wl12xx_is_dummy_packet(wl, skb)) {
1109                         /*
1110                          * Remove private headers before passing the skb to
1111                          * mac80211
1112                          */
1113                         info = IEEE80211_SKB_CB(skb);
1114                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
1115                         if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
1116                             info->control.hw_key &&
1117                             info->control.hw_key->cipher ==
1118                             WLAN_CIPHER_SUITE_TKIP) {
1119                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1120                                 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
1121                                         skb->data, hdrlen);
1122                                 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
1123                         }
1124
1125                         info->status.rates[0].idx = -1;
1126                         info->status.rates[0].count = 0;
1127
1128                         ieee80211_tx_status_ni(wl->hw, skb);
1129                 }
1130         }
1131 }
1132
1133 #define WL1271_TX_FLUSH_TIMEOUT 500000
1134
1135 /* caller must *NOT* hold wl->mutex */
1136 void wl1271_tx_flush(struct wl1271 *wl)
1137 {
1138         unsigned long timeout, start_time;
1139         int i;
1140         start_time = jiffies;
1141         timeout = start_time + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
1142
1143         /* only one flush should be in progress, for consistent queue state */
1144         mutex_lock(&wl->flush_mutex);
1145
1146         mutex_lock(&wl->mutex);
1147         if (wl->tx_frames_cnt == 0 && wl1271_tx_total_queue_count(wl) == 0) {
1148                 mutex_unlock(&wl->mutex);
1149                 goto out;
1150         }
1151
1152         wlcore_stop_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1153
1154         while (!time_after(jiffies, timeout)) {
1155                 wl1271_debug(DEBUG_MAC80211, "flushing tx buffer: %d %d",
1156                              wl->tx_frames_cnt,
1157                              wl1271_tx_total_queue_count(wl));
1158
1159                 /* force Tx and give the driver some time to flush data */
1160                 mutex_unlock(&wl->mutex);
1161                 if (wl1271_tx_total_queue_count(wl))
1162                         wl1271_tx_work(&wl->tx_work);
1163                 msleep(20);
1164                 mutex_lock(&wl->mutex);
1165
1166                 if ((wl->tx_frames_cnt == 0) &&
1167                     (wl1271_tx_total_queue_count(wl) == 0)) {
1168                         wl1271_debug(DEBUG_MAC80211, "tx flush took %d ms",
1169                                      jiffies_to_msecs(jiffies - start_time));
1170                         goto out_wake;
1171                 }
1172         }
1173
1174         wl1271_warning("Unable to flush all TX buffers, "
1175                        "timed out (timeout %d ms",
1176                        WL1271_TX_FLUSH_TIMEOUT / 1000);
1177
1178         /* forcibly flush all Tx buffers on our queues */
1179         for (i = 0; i < WL12XX_MAX_LINKS; i++)
1180                 wl1271_tx_reset_link_queues(wl, i);
1181
1182 out_wake:
1183         wlcore_wake_queues(wl, WLCORE_QUEUE_STOP_REASON_FLUSH);
1184         mutex_unlock(&wl->mutex);
1185 out:
1186         mutex_unlock(&wl->flush_mutex);
1187 }
1188 EXPORT_SYMBOL_GPL(wl1271_tx_flush);
1189
1190 u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
1191 {
1192         if (WARN_ON(!rate_set))
1193                 return 0;
1194
1195         return BIT(__ffs(rate_set));
1196 }
1197 EXPORT_SYMBOL_GPL(wl1271_tx_min_rate_get);
1198
1199 void wlcore_stop_queue_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1200                               u8 queue, enum wlcore_queue_stop_reason reason)
1201 {
1202         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1203         bool stopped = !!wl->queue_stop_reasons[hwq];
1204
1205         /* queue should not be stopped for this reason */
1206         WARN_ON_ONCE(test_and_set_bit(reason, &wl->queue_stop_reasons[hwq]));
1207
1208         if (stopped)
1209                 return;
1210
1211         ieee80211_stop_queue(wl->hw, hwq);
1212 }
1213
1214 void wlcore_stop_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1215                        enum wlcore_queue_stop_reason reason)
1216 {
1217         unsigned long flags;
1218
1219         spin_lock_irqsave(&wl->wl_lock, flags);
1220         wlcore_stop_queue_locked(wl, wlvif, queue, reason);
1221         spin_unlock_irqrestore(&wl->wl_lock, flags);
1222 }
1223
1224 void wlcore_wake_queue(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 queue,
1225                        enum wlcore_queue_stop_reason reason)
1226 {
1227         unsigned long flags;
1228         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1229
1230         spin_lock_irqsave(&wl->wl_lock, flags);
1231
1232         /* queue should not be clear for this reason */
1233         WARN_ON_ONCE(!test_and_clear_bit(reason, &wl->queue_stop_reasons[hwq]));
1234
1235         if (wl->queue_stop_reasons[hwq])
1236                 goto out;
1237
1238         ieee80211_wake_queue(wl->hw, hwq);
1239
1240 out:
1241         spin_unlock_irqrestore(&wl->wl_lock, flags);
1242 }
1243
1244 void wlcore_stop_queues(struct wl1271 *wl,
1245                         enum wlcore_queue_stop_reason reason)
1246 {
1247         int i;
1248         unsigned long flags;
1249
1250         spin_lock_irqsave(&wl->wl_lock, flags);
1251
1252         /* mark all possible queues as stopped */
1253         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1254                 WARN_ON_ONCE(test_and_set_bit(reason,
1255                                               &wl->queue_stop_reasons[i]));
1256
1257         /* use the global version to make sure all vifs in mac80211 we don't
1258          * know are stopped.
1259          */
1260         ieee80211_stop_queues(wl->hw);
1261
1262         spin_unlock_irqrestore(&wl->wl_lock, flags);
1263 }
1264
1265 void wlcore_wake_queues(struct wl1271 *wl,
1266                         enum wlcore_queue_stop_reason reason)
1267 {
1268         int i;
1269         unsigned long flags;
1270
1271         spin_lock_irqsave(&wl->wl_lock, flags);
1272
1273         /* mark all possible queues as awake */
1274         for (i = 0; i < WLCORE_NUM_MAC_ADDRESSES * NUM_TX_QUEUES; i++)
1275                 WARN_ON_ONCE(!test_and_clear_bit(reason,
1276                                                  &wl->queue_stop_reasons[i]));
1277
1278         /* use the global version to make sure all vifs in mac80211 we don't
1279          * know are woken up.
1280          */
1281         ieee80211_wake_queues(wl->hw);
1282
1283         spin_unlock_irqrestore(&wl->wl_lock, flags);
1284 }
1285
1286 bool wlcore_is_queue_stopped_by_reason(struct wl1271 *wl,
1287                                        struct wl12xx_vif *wlvif, u8 queue,
1288                                        enum wlcore_queue_stop_reason reason)
1289 {
1290         unsigned long flags;
1291         bool stopped;
1292
1293         spin_lock_irqsave(&wl->wl_lock, flags);
1294         stopped = wlcore_is_queue_stopped_by_reason_locked(wl, wlvif, queue,
1295                                                            reason);
1296         spin_unlock_irqrestore(&wl->wl_lock, flags);
1297
1298         return stopped;
1299 }
1300
1301 bool wlcore_is_queue_stopped_by_reason_locked(struct wl1271 *wl,
1302                                        struct wl12xx_vif *wlvif, u8 queue,
1303                                        enum wlcore_queue_stop_reason reason)
1304 {
1305         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1306
1307         WARN_ON_ONCE(!spin_is_locked(&wl->wl_lock));
1308         return test_bit(reason, &wl->queue_stop_reasons[hwq]);
1309 }
1310
1311 bool wlcore_is_queue_stopped_locked(struct wl1271 *wl, struct wl12xx_vif *wlvif,
1312                                     u8 queue)
1313 {
1314         int hwq = wlcore_tx_get_mac80211_queue(wlvif, queue);
1315
1316         WARN_ON_ONCE(!spin_is_locked(&wl->wl_lock));
1317         return !!wl->queue_stop_reasons[hwq];
1318 }