Pileus Git - ~andy/linux/blob - drivers/net/wireless/wl12xx/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 "wl12xx.h"
  29 #include "io.h"
  30 #include "reg.h"
  31 #include "ps.h"
  32 #include "tx.h"
  33
  34 static int wl1271_set_default_wep_key(struct wl1271 *wl, u8 id)
  35 {
  36         int ret;
  37         bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
  38
  39         if (is_ap)
  40                 ret = wl1271_cmd_set_ap_default_wep_key(wl, id);
  41         else
  42                 ret = wl1271_cmd_set_sta_default_wep_key(wl, id);
  43
  44         if (ret < 0)
  45                 return ret;
  46
  47         wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
  48         return 0;
  49 }
  50
  51 static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
  52 {
  53         int id;
  54
  55         id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
  56         if (id >= ACX_TX_DESCRIPTORS)
  57                 return -EBUSY;
  58
  59         __set_bit(id, wl->tx_frames_map);
  60         wl->tx_frames[id] = skb;
  61         wl->tx_frames_cnt++;
  62         return id;
  63 }
  64
  65 static void wl1271_free_tx_id(struct wl1271 *wl, int id)
  66 {
  67         if (__test_and_clear_bit(id, wl->tx_frames_map)) {
  68                 wl->tx_frames[id] = NULL;
  69                 wl->tx_frames_cnt--;
  70         }
  71 }
  72
  73 static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
  74                                                  struct sk_buff *skb)
  75 {
  76         struct ieee80211_hdr *hdr;
  77
  78         /*
  79          * add the station to the known list before transmitting the
  80          * authentication response. this way it won't get de-authed by FW
  81          * when transmitting too soon.
  82          */
  83         hdr = (struct ieee80211_hdr *)(skb->data +
  84                                        sizeof(struct wl1271_tx_hw_descr));
  85         if (ieee80211_is_auth(hdr->frame_control))
  86                 wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
  87 }
  88
  89 static void wl1271_tx_regulate_link(struct wl1271 *wl, u8 hlid)
  90 {
  91         bool fw_ps;
  92         u8 tx_blks;
  93
  94         /* only regulate station links */
  95         if (hlid < WL1271_AP_STA_HLID_START)
  96                 return;
  97
  98         fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
  99         tx_blks = wl->links[hlid].allocated_blks;
 100
 101         /*
 102          * if in FW PS and there is enough data in FW we can put the link
 103          * into high-level PS and clean out its TX queues.
 104          */
 105         if (fw_ps && tx_blks >= WL1271_PS_STA_MAX_BLOCKS)
 106                 wl1271_ps_link_start(wl, hlid, true);
 107 }
 108
 109 u8 wl1271_tx_get_hlid(struct sk_buff *skb)
 110 {
 111         struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
 112
 113         if (control->control.sta) {
 114                 struct wl1271_station *wl_sta;
 115
 116                 wl_sta = (struct wl1271_station *)
 117                                 control->control.sta->drv_priv;
 118                 return wl_sta->hlid;
 119         } else {
 120                 struct ieee80211_hdr *hdr;
 121
 122                 hdr = (struct ieee80211_hdr *)skb->data;
 123                 if (ieee80211_is_mgmt(hdr->frame_control))
 124                         return WL1271_AP_GLOBAL_HLID;
 125                 else
 126                         return WL1271_AP_BROADCAST_HLID;
 127         }
 128 }
 129
 130 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
 131                                 u32 buf_offset, u8 hlid)
 132 {
 133         struct wl1271_tx_hw_descr *desc;
 134         u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
 135         u32 total_blocks;
 136         int id, ret = -EBUSY;
 137
 138         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 139                 return -EAGAIN;
 140
 141         /* allocate free identifier for the packet */
 142         id = wl1271_alloc_tx_id(wl, skb);
 143         if (id < 0)
 144                 return id;
 145
 146         /* approximate the number of blocks required for this packet
 147            in the firmware */
 148         total_blocks = total_len + TX_HW_BLOCK_SIZE - 1;
 149         total_blocks = total_blocks / TX_HW_BLOCK_SIZE + TX_HW_BLOCK_SPARE;
 150         if (total_blocks <= wl->tx_blocks_available) {
 151                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 152                         skb, total_len - skb->len);
 153
 154                 desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
 155                 desc->total_mem_blocks = total_blocks;
 156                 desc->id = id;
 157
 158                 wl->tx_blocks_available -= total_blocks;
 159
 160                 if (wl->bss_type == BSS_TYPE_AP_BSS)
 161                         wl->links[hlid].allocated_blks += total_blocks;
 162
 163                 ret = 0;
 164
 165                 wl1271_debug(DEBUG_TX,
 166                              "tx_allocate: size: %d, blocks: %d, id: %d",
 167                              total_len, total_blocks, id);
 168         } else {
 169                 wl1271_free_tx_id(wl, id);
 170         }
 171
 172         return ret;
 173 }
 174
 175 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
 176                               u32 extra, struct ieee80211_tx_info *control,
 177                               u8 hlid)
 178 {
 179         struct timespec ts;
 180         struct wl1271_tx_hw_descr *desc;
 181         int pad, ac, rate_idx;
 182         s64 hosttime;
 183         u16 tx_attr;
 184
 185         desc = (struct wl1271_tx_hw_descr *) skb->data;
 186
 187         /* relocate space for security header */
 188         if (extra) {
 189                 void *framestart = skb->data + sizeof(*desc);
 190                 u16 fc = *(u16 *)(framestart + extra);
 191                 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
 192                 memmove(framestart, framestart + extra, hdrlen);
 193         }
 194
 195         /* configure packet life time */
 196         getnstimeofday(&ts);
 197         hosttime = (timespec_to_ns(&ts) >> 10);
 198         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 199
 200         if (wl->bss_type != BSS_TYPE_AP_BSS)
 201                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 202         else
 203                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 204
 205         /* configure the tx attributes */
 206         tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
 207
 208         /* queue (we use same identifiers for tid's and ac's */
 209         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 210         desc->tid = ac;
 211
 212         if (wl->bss_type != BSS_TYPE_AP_BSS) {
 213                 desc->aid = hlid;
 214
 215                 /* if the packets are destined for AP (have a STA entry)
 216                    send them with AP rate policies, otherwise use default
 217                    basic rates */
 218                 if (control->control.sta)
 219                         rate_idx = ACX_TX_AP_FULL_RATE;
 220                 else
 221                         rate_idx = ACX_TX_BASIC_RATE;
 222         } else {
 223                 desc->hlid = hlid;
 224                 switch (hlid) {
 225                 case WL1271_AP_GLOBAL_HLID:
 226                         rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
 227                         break;
 228                 case WL1271_AP_BROADCAST_HLID:
 229                         rate_idx = ACX_TX_AP_MODE_BCST_RATE;
 230                         break;
 231                 default:
 232                         rate_idx = ac;
 233                         break;
 234                 }
 235         }
 236
 237         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 238         desc->reserved = 0;
 239
 240         /* align the length (and store in terms of words) */
 241         pad = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 242         desc->length = cpu_to_le16(pad >> 2);
 243
 244         /* calculate number of padding bytes */
 245         pad = pad - skb->len;
 246         tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
 247
 248         desc->tx_attr = cpu_to_le16(tx_attr);
 249
 250         wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
 251                 "tx_attr: 0x%x len: %d life: %d mem: %d", pad, desc->hlid,
 252                 le16_to_cpu(desc->tx_attr), le16_to_cpu(desc->length),
 253                 le16_to_cpu(desc->life_time), desc->total_mem_blocks);
 254 }
 255
 256 /* caller must hold wl->mutex */
 257 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
 258                                                         u32 buf_offset)
 259 {
 260         struct ieee80211_tx_info *info;
 261         u32 extra = 0;
 262         int ret = 0;
 263         u32 total_len;
 264         u8 hlid;
 265
 266         if (!skb)
 267                 return -EINVAL;
 268
 269         info = IEEE80211_SKB_CB(skb);
 270
 271         if (info->control.hw_key &&
 272             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 273                 extra = WL1271_TKIP_IV_SPACE;
 274
 275         if (info->control.hw_key) {
 276                 bool is_wep;
 277                 u8 idx = info->control.hw_key->hw_key_idx;
 278                 u32 cipher = info->control.hw_key->cipher;
 279
 280                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 281                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 282
 283                 if (unlikely(is_wep && wl->default_key != idx)) {
 284                         ret = wl1271_set_default_wep_key(wl, idx);
 285                         if (ret < 0)
 286                                 return ret;
 287                         wl->default_key = idx;
 288                 }
 289         }
 290
 291         if (wl->bss_type == BSS_TYPE_AP_BSS)
 292                 hlid = wl1271_tx_get_hlid(skb);
 293         else
 294                 hlid = TX_HW_DEFAULT_AID;
 295
 296         ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
 297         if (ret < 0)
 298                 return ret;
 299
 300         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 301                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 302                 wl1271_tx_regulate_link(wl, hlid);
 303         }
 304
 305         wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
 306
 307         /*
 308          * The length of each packet is stored in terms of words. Thus, we must
 309          * pad the skb data to make sure its length is aligned.
 310          * The number of padding bytes is computed and set in wl1271_tx_fill_hdr
 311          */
 312         total_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 313         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 314         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 315
 316         return total_len;
 317 }
 318
 319 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
 320 {
 321         struct ieee80211_supported_band *band;
 322         u32 enabled_rates = 0;
 323         int bit;
 324
 325         band = wl->hw->wiphy->bands[wl->band];
 326         for (bit = 0; bit < band->n_bitrates; bit++) {
 327                 if (rate_set & 0x1)
 328                         enabled_rates |= band->bitrates[bit].hw_value;
 329                 rate_set >>= 1;
 330         }
 331
 332 #ifdef CONFIG_WL12XX_HT
 333         /* MCS rates indication are on bits 16 - 23 */
 334         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 335
 336         for (bit = 0; bit < 8; bit++) {
 337                 if (rate_set & 0x1)
 338                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 339                 rate_set >>= 1;
 340         }
 341 #endif
 342
 343         return enabled_rates;
 344 }
 345
 346 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 347 {
 348         unsigned long flags;
 349
 350         if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
 351             wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 352                 /* firmware buffer has space, restart queues */
 353                 spin_lock_irqsave(&wl->wl_lock, flags);
 354                 ieee80211_wake_queues(wl->hw);
 355                 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
 356                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 357         }
 358 }
 359
 360 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
 361 {
 362         struct sk_buff *skb = NULL;
 363         unsigned long flags;
 364
 365         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
 366         if (skb)
 367                 goto out;
 368         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
 369         if (skb)
 370                 goto out;
 371         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
 372         if (skb)
 373                 goto out;
 374         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
 375
 376 out:
 377         if (skb) {
 378                 spin_lock_irqsave(&wl->wl_lock, flags);
 379                 wl->tx_queue_count--;
 380                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 381         }
 382
 383         return skb;
 384 }
 385
 386 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
 387 {
 388         struct sk_buff *skb = NULL;
 389         unsigned long flags;
 390         int i, h, start_hlid;
 391
 392         /* start from the link after the last one */
 393         start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
 394
 395         /* dequeue according to AC, round robin on each link */
 396         for (i = 0; i < AP_MAX_LINKS; i++) {
 397                 h = (start_hlid + i) % AP_MAX_LINKS;
 398
 399                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
 400                 if (skb)
 401                         goto out;
 402                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
 403                 if (skb)
 404                         goto out;
 405                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
 406                 if (skb)
 407                         goto out;
 408                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
 409                 if (skb)
 410                         goto out;
 411         }
 412
 413 out:
 414         if (skb) {
 415                 wl->last_tx_hlid = h;
 416                 spin_lock_irqsave(&wl->wl_lock, flags);
 417                 wl->tx_queue_count--;
 418                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 419         } else {
 420                 wl->last_tx_hlid = 0;
 421         }
 422
 423         return skb;
 424 }
 425
 426 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 427 {
 428         if (wl->bss_type == BSS_TYPE_AP_BSS)
 429                 return wl1271_ap_skb_dequeue(wl);
 430
 431         return wl1271_sta_skb_dequeue(wl);
 432 }
 433
 434 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
 435 {
 436         unsigned long flags;
 437         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 438
 439         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 440                 u8 hlid = wl1271_tx_get_hlid(skb);
 441                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 442
 443                 /* make sure we dequeue the same packet next time */
 444                 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
 445         } else {
 446                 skb_queue_head(&wl->tx_queue[q], skb);
 447         }
 448
 449         spin_lock_irqsave(&wl->wl_lock, flags);
 450         wl->tx_queue_count++;
 451         spin_unlock_irqrestore(&wl->wl_lock, flags);
 452 }
 453
 454 void wl1271_tx_work_locked(struct wl1271 *wl)
 455 {
 456         struct sk_buff *skb;
 457         bool woken_up = false;
 458         u32 buf_offset = 0;
 459         bool sent_packets = false;
 460         int ret;
 461
 462         if (unlikely(wl->state == WL1271_STATE_OFF))
 463                 goto out;
 464
 465         while ((skb = wl1271_skb_dequeue(wl))) {
 466                 if (!woken_up) {
 467                         ret = wl1271_ps_elp_wakeup(wl);
 468                         if (ret < 0)
 469                                 goto out_ack;
 470                         woken_up = true;
 471                 }
 472
 473                 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
 474                 if (ret == -EAGAIN) {
 475                         /*
 476                          * Aggregation buffer is full.
 477                          * Flush buffer and try again.
 478                          */
 479                         wl1271_skb_queue_head(wl, skb);
 480                         wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 481                                      buf_offset, true);
 482                         sent_packets = true;
 483                         buf_offset = 0;
 484                         continue;
 485                 } else if (ret == -EBUSY) {
 486                         /*
 487                          * Firmware buffer is full.
 488                          * Queue back last skb, and stop aggregating.
 489                          */
 490                         wl1271_skb_queue_head(wl, skb);
 491                         /* No work left, avoid scheduling redundant tx work */
 492                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 493                         goto out_ack;
 494                 } else if (ret < 0) {
 495                         dev_kfree_skb(skb);
 496                         goto out_ack;
 497                 }
 498                 buf_offset += ret;
 499                 wl->tx_packets_count++;
 500         }
 501
 502 out_ack:
 503         if (buf_offset) {
 504                 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 505                                 buf_offset, true);
 506                 sent_packets = true;
 507         }
 508         if (sent_packets) {
 509                 /*
 510                  * Interrupt the firmware with the new packets. This is only
 511                  * required for older hardware revisions
 512                  */
 513                 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
 514                         wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
 515                                        wl->tx_packets_count);
 516
 517                 wl1271_handle_tx_low_watermark(wl);
 518         }
 519
 520 out:
 521         if (woken_up)
 522                 wl1271_ps_elp_sleep(wl);
 523 }
 524
 525 void wl1271_tx_work(struct work_struct *work)
 526 {
 527         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 528
 529         mutex_lock(&wl->mutex);
 530         wl1271_tx_work_locked(wl);
 531         mutex_unlock(&wl->mutex);
 532 }
 533
 534 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 535                                       struct wl1271_tx_hw_res_descr *result)
 536 {
 537         struct ieee80211_tx_info *info;
 538         struct sk_buff *skb;
 539         int id = result->id;
 540         int rate = -1;
 541         u8 retries = 0;
 542
 543         /* check for id legality */
 544         if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
 545                 wl1271_warning("TX result illegal id: %d", id);
 546                 return;
 547         }
 548
 549         skb = wl->tx_frames[id];
 550         info = IEEE80211_SKB_CB(skb);
 551
 552         /* update the TX status info */
 553         if (result->status == TX_SUCCESS) {
 554                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 555                         info->flags |= IEEE80211_TX_STAT_ACK;
 556                 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
 557                 retries = result->ack_failures;
 558         } else if (result->status == TX_RETRY_EXCEEDED) {
 559                 wl->stats.excessive_retries++;
 560                 retries = result->ack_failures;
 561         }
 562
 563         info->status.rates[0].idx = rate;
 564         info->status.rates[0].count = retries;
 565         info->status.rates[0].flags = 0;
 566         info->status.ack_signal = -1;
 567
 568         wl->stats.retry_count += result->ack_failures;
 569
 570         /* update security sequence number */
 571         wl->tx_security_seq += (result->lsb_security_sequence_number -
 572                                 wl->tx_security_last_seq);
 573         wl->tx_security_last_seq = result->lsb_security_sequence_number;
 574
 575         /* remove private header from packet */
 576         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 577
 578         /* remove TKIP header space if present */
 579         if (info->control.hw_key &&
 580             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 581                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 582                 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
 583                 skb_pull(skb, WL1271_TKIP_IV_SPACE);
 584         }
 585
 586         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 587                      " status 0x%x",
 588                      result->id, skb, result->ack_failures,
 589                      result->rate_class_index, result->status);
 590
 591         /* return the packet to the stack */
 592         skb_queue_tail(&wl->deferred_tx_queue, skb);
 593         ieee80211_queue_work(wl->hw, &wl->netstack_work);
 594         wl1271_free_tx_id(wl, result->id);
 595 }
 596
 597 /* Called upon reception of a TX complete interrupt */
 598 void wl1271_tx_complete(struct wl1271 *wl)
 599 {
 600         struct wl1271_acx_mem_map *memmap =
 601                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 602         u32 count, fw_counter;
 603         u32 i;
 604
 605         /* read the tx results from the chipset */
 606         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 607                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 608         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 609
 610         /* write host counter to chipset (to ack) */
 611         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 612                        offsetof(struct wl1271_tx_hw_res_if,
 613                                 tx_result_host_counter), fw_counter);
 614
 615         count = fw_counter - wl->tx_results_count;
 616         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 617
 618         /* verify that the result buffer is not getting overrun */
 619         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 620                 wl1271_warning("TX result overflow from chipset: %d", count);
 621
 622         /* process the results */
 623         for (i = 0; i < count; i++) {
 624                 struct wl1271_tx_hw_res_descr *result;
 625                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 626
 627                 /* process the packet */
 628                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 629                 wl1271_tx_complete_packet(wl, result);
 630
 631                 wl->tx_results_count++;
 632         }
 633 }
 634
 635 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 636 {
 637         struct sk_buff *skb;
 638         int i, total = 0;
 639         unsigned long flags;
 640         struct ieee80211_tx_info *info;
 641
 642         for (i = 0; i < NUM_TX_QUEUES; i++) {
 643                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 644                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 645                         info = IEEE80211_SKB_CB(skb);
 646                         info->status.rates[0].idx = -1;
 647                         info->status.rates[0].count = 0;
 648                         ieee80211_tx_status(wl->hw, skb);
 649                         total++;
 650                 }
 651         }
 652
 653         spin_lock_irqsave(&wl->wl_lock, flags);
 654         wl->tx_queue_count -= total;
 655         spin_unlock_irqrestore(&wl->wl_lock, flags);
 656
 657         wl1271_handle_tx_low_watermark(wl);
 658 }
 659
 660 /* caller must hold wl->mutex */
 661 void wl1271_tx_reset(struct wl1271 *wl)
 662 {
 663         int i;
 664         struct sk_buff *skb;
 665         struct ieee80211_tx_info *info;
 666
 667         /* TX failure */
 668         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 669                 for (i = 0; i < AP_MAX_LINKS; i++) {
 670                         wl1271_tx_reset_link_queues(wl, i);
 671                         wl->links[i].allocated_blks = 0;
 672                         wl->links[i].prev_freed_blks = 0;
 673                 }
 674
 675                 wl->last_tx_hlid = 0;
 676         } else {
 677                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 678                         while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
 679                                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
 680                                              skb);
 681                                 info = IEEE80211_SKB_CB(skb);
 682                                 info->status.rates[0].idx = -1;
 683                                 info->status.rates[0].count = 0;
 684                                 ieee80211_tx_status(wl->hw, skb);
 685                         }
 686                 }
 687         }
 688
 689         wl->tx_queue_count = 0;
 690
 691         /*
 692          * Make sure the driver is at a consistent state, in case this
 693          * function is called from a context other than interface removal.
 694          */
 695         wl1271_handle_tx_low_watermark(wl);
 696
 697         for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
 698                 if (wl->tx_frames[i] == NULL)
 699                         continue;
 700
 701                 skb = wl->tx_frames[i];
 702                 wl1271_free_tx_id(wl, i);
 703                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 704
 705                 /* Remove private headers before passing the skb to mac80211 */
 706                 info = IEEE80211_SKB_CB(skb);
 707                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 708                 if (info->control.hw_key &&
 709                     info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 710                         int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 711                         memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data,
 712                                 hdrlen);
 713                         skb_pull(skb, WL1271_TKIP_IV_SPACE);
 714                 }
 715
 716                 info->status.rates[0].idx = -1;
 717                 info->status.rates[0].count = 0;
 718
 719                 ieee80211_tx_status(wl->hw, skb);
 720         }
 721 }
 722
 723 #define WL1271_TX_FLUSH_TIMEOUT 500000
 724
 725 /* caller must *NOT* hold wl->mutex */
 726 void wl1271_tx_flush(struct wl1271 *wl)
 727 {
 728         unsigned long timeout;
 729         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
 730
 731         while (!time_after(jiffies, timeout)) {
 732                 mutex_lock(&wl->mutex);
 733                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
 734                              wl->tx_frames_cnt, wl->tx_queue_count);
 735                 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
 736                         mutex_unlock(&wl->mutex);
 737                         return;
 738                 }
 739                 mutex_unlock(&wl->mutex);
 740                 msleep(1);
 741         }
 742
 743         wl1271_warning("Unable to flush all TX buffers, timed out.");
 744 }
 745
 746 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
 747 {
 748         int i;
 749         u32 rate = 0;
 750
 751         if (!wl->basic_rate_set) {
 752                 WARN_ON(1);
 753                 wl->basic_rate_set = wl->conf.tx.basic_rate;
 754         }
 755
 756         for (i = 0; !rate; i++) {
 757                 if ((wl->basic_rate_set >> i) & 0x1)
 758                         rate = 1 << i;
 759         }
 760
 761         return rate;
 762 }