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 len;
 136         u32 total_blocks;
 137         int id, ret = -EBUSY;
 138
 139         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 140                 return -EAGAIN;
 141
 142         /* allocate free identifier for the packet */
 143         id = wl1271_alloc_tx_id(wl, skb);
 144         if (id < 0)
 145                 return id;
 146
 147         /* approximate the number of blocks required for this packet
 148            in the firmware */
 149         if (wl->block_size)
 150                 len = ALIGN(total_len, wl->block_size);
 151         else
 152                 len = total_len;
 153
 154         total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
 155                 TX_HW_BLOCK_SPARE;
 156
 157         if (total_blocks <= wl->tx_blocks_available) {
 158                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 159                         skb, total_len - skb->len);
 160
 161                 /* HW descriptor fields change between wl127x and wl128x */
 162                 if (wl->chip.id == CHIP_ID_1283_PG20) {
 163                         desc->wl128x_mem.total_mem_blocks = total_blocks;
 164                 } else {
 165                         desc->wl127x_mem.extra_blocks = TX_HW_BLOCK_SPARE;
 166                         desc->wl127x_mem.total_mem_blocks = total_blocks;
 167                 }
 168
 169                 desc->id = id;
 170
 171                 wl->tx_blocks_available -= total_blocks;
 172
 173                 if (wl->bss_type == BSS_TYPE_AP_BSS)
 174                         wl->links[hlid].allocated_blks += total_blocks;
 175
 176                 ret = 0;
 177
 178                 wl1271_debug(DEBUG_TX,
 179                              "tx_allocate: size: %d, blocks: %d, id: %d",
 180                              total_len, total_blocks, id);
 181         } else {
 182                 wl1271_free_tx_id(wl, id);
 183         }
 184
 185         return ret;
 186 }
 187
 188 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
 189                               u32 extra, struct ieee80211_tx_info *control,
 190                               u8 hlid)
 191 {
 192         struct timespec ts;
 193         struct wl1271_tx_hw_descr *desc;
 194         int aligned_len, ac, rate_idx;
 195         s64 hosttime;
 196         u16 tx_attr;
 197
 198         desc = (struct wl1271_tx_hw_descr *) skb->data;
 199
 200         /* relocate space for security header */
 201         if (extra) {
 202                 void *framestart = skb->data + sizeof(*desc);
 203                 u16 fc = *(u16 *)(framestart + extra);
 204                 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
 205                 memmove(framestart, framestart + extra, hdrlen);
 206         }
 207
 208         /* configure packet life time */
 209         getnstimeofday(&ts);
 210         hosttime = (timespec_to_ns(&ts) >> 10);
 211         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 212
 213         if (wl->bss_type != BSS_TYPE_AP_BSS)
 214                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 215         else
 216                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 217
 218         /* configure the tx attributes */
 219         tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
 220
 221         /* queue (we use same identifiers for tid's and ac's */
 222         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 223         desc->tid = ac;
 224
 225         if (wl->bss_type != BSS_TYPE_AP_BSS) {
 226                 desc->aid = hlid;
 227
 228                 /* if the packets are destined for AP (have a STA entry)
 229                    send them with AP rate policies, otherwise use default
 230                    basic rates */
 231                 if (control->control.sta)
 232                         rate_idx = ACX_TX_AP_FULL_RATE;
 233                 else
 234                         rate_idx = ACX_TX_BASIC_RATE;
 235         } else {
 236                 desc->hlid = hlid;
 237                 switch (hlid) {
 238                 case WL1271_AP_GLOBAL_HLID:
 239                         rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
 240                         break;
 241                 case WL1271_AP_BROADCAST_HLID:
 242                         rate_idx = ACX_TX_AP_MODE_BCST_RATE;
 243                         break;
 244                 default:
 245                         rate_idx = ac;
 246                         break;
 247                 }
 248         }
 249
 250         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 251         desc->reserved = 0;
 252
 253         if (wl->block_size) {
 254                 aligned_len = ALIGN(skb->len, wl->block_size);
 255
 256                 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
 257                 desc->length = cpu_to_le16(aligned_len >> 2);
 258
 259                 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
 260                              "tx_attr: 0x%x len: %d life: %d mem: %d",
 261                              desc->hlid, tx_attr,
 262                              le16_to_cpu(desc->length),
 263                              le16_to_cpu(desc->life_time),
 264                              desc->wl128x_mem.total_mem_blocks);
 265         } else {
 266                 int pad;
 267
 268                 /* align the length (and store in terms of words) */
 269                 aligned_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 270                 desc->length = cpu_to_le16(aligned_len >> 2);
 271
 272                 /* calculate number of padding bytes */
 273                 pad = aligned_len - skb->len;
 274                 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
 275
 276                 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
 277                              "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
 278                              desc->hlid, tx_attr,
 279                              le16_to_cpu(desc->length),
 280                              le16_to_cpu(desc->life_time),
 281                              desc->wl127x_mem.total_mem_blocks);
 282         }
 283
 284         desc->tx_attr = cpu_to_le16(tx_attr);
 285 }
 286
 287 /* caller must hold wl->mutex */
 288 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
 289                                                         u32 buf_offset)
 290 {
 291         struct ieee80211_tx_info *info;
 292         u32 extra = 0;
 293         int ret = 0;
 294         u32 total_len;
 295         u8 hlid;
 296
 297         if (!skb)
 298                 return -EINVAL;
 299
 300         info = IEEE80211_SKB_CB(skb);
 301
 302         if (info->control.hw_key &&
 303             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 304                 extra = WL1271_TKIP_IV_SPACE;
 305
 306         if (info->control.hw_key) {
 307                 bool is_wep;
 308                 u8 idx = info->control.hw_key->hw_key_idx;
 309                 u32 cipher = info->control.hw_key->cipher;
 310
 311                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 312                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 313
 314                 if (unlikely(is_wep && wl->default_key != idx)) {
 315                         ret = wl1271_set_default_wep_key(wl, idx);
 316                         if (ret < 0)
 317                                 return ret;
 318                         wl->default_key = idx;
 319                 }
 320         }
 321
 322         if (wl->bss_type == BSS_TYPE_AP_BSS)
 323                 hlid = wl1271_tx_get_hlid(skb);
 324         else
 325                 hlid = TX_HW_DEFAULT_AID;
 326
 327         ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
 328         if (ret < 0)
 329                 return ret;
 330
 331         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 332                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 333                 wl1271_tx_regulate_link(wl, hlid);
 334         }
 335
 336         wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
 337
 338         /*
 339          * The length of each packet is stored in terms of
 340          * words. Thus, we must pad the skb data to make sure its
 341          * length is aligned.  The number of padding bytes is computed
 342          * and set in wl1271_tx_fill_hdr.
 343          * In special cases, we want to align to a specific block size
 344          * (eg. for wl128x with SDIO we align to 256).
 345          */
 346         if (wl->block_size)
 347                 total_len = ALIGN(skb->len, wl->block_size);
 348         else
 349                 total_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 350
 351         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 352         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 353
 354         return total_len;
 355 }
 356
 357 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
 358 {
 359         struct ieee80211_supported_band *band;
 360         u32 enabled_rates = 0;
 361         int bit;
 362
 363         band = wl->hw->wiphy->bands[wl->band];
 364         for (bit = 0; bit < band->n_bitrates; bit++) {
 365                 if (rate_set & 0x1)
 366                         enabled_rates |= band->bitrates[bit].hw_value;
 367                 rate_set >>= 1;
 368         }
 369
 370 #ifdef CONFIG_WL12XX_HT
 371         /* MCS rates indication are on bits 16 - 23 */
 372         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 373
 374         for (bit = 0; bit < 8; bit++) {
 375                 if (rate_set & 0x1)
 376                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 377                 rate_set >>= 1;
 378         }
 379 #endif
 380
 381         return enabled_rates;
 382 }
 383
 384 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 385 {
 386         unsigned long flags;
 387
 388         if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
 389             wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 390                 /* firmware buffer has space, restart queues */
 391                 spin_lock_irqsave(&wl->wl_lock, flags);
 392                 ieee80211_wake_queues(wl->hw);
 393                 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
 394                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 395         }
 396 }
 397
 398 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
 399 {
 400         struct sk_buff *skb = NULL;
 401         unsigned long flags;
 402
 403         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
 404         if (skb)
 405                 goto out;
 406         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
 407         if (skb)
 408                 goto out;
 409         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
 410         if (skb)
 411                 goto out;
 412         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
 413
 414 out:
 415         if (skb) {
 416                 spin_lock_irqsave(&wl->wl_lock, flags);
 417                 wl->tx_queue_count--;
 418                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 419         }
 420
 421         return skb;
 422 }
 423
 424 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
 425 {
 426         struct sk_buff *skb = NULL;
 427         unsigned long flags;
 428         int i, h, start_hlid;
 429
 430         /* start from the link after the last one */
 431         start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
 432
 433         /* dequeue according to AC, round robin on each link */
 434         for (i = 0; i < AP_MAX_LINKS; i++) {
 435                 h = (start_hlid + i) % AP_MAX_LINKS;
 436
 437                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
 438                 if (skb)
 439                         goto out;
 440                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
 441                 if (skb)
 442                         goto out;
 443                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
 444                 if (skb)
 445                         goto out;
 446                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
 447                 if (skb)
 448                         goto out;
 449         }
 450
 451 out:
 452         if (skb) {
 453                 wl->last_tx_hlid = h;
 454                 spin_lock_irqsave(&wl->wl_lock, flags);
 455                 wl->tx_queue_count--;
 456                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 457         } else {
 458                 wl->last_tx_hlid = 0;
 459         }
 460
 461         return skb;
 462 }
 463
 464 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 465 {
 466         if (wl->bss_type == BSS_TYPE_AP_BSS)
 467                 return wl1271_ap_skb_dequeue(wl);
 468
 469         return wl1271_sta_skb_dequeue(wl);
 470 }
 471
 472 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
 473 {
 474         unsigned long flags;
 475         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 476
 477         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 478                 u8 hlid = wl1271_tx_get_hlid(skb);
 479                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 480
 481                 /* make sure we dequeue the same packet next time */
 482                 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
 483         } else {
 484                 skb_queue_head(&wl->tx_queue[q], skb);
 485         }
 486
 487         spin_lock_irqsave(&wl->wl_lock, flags);
 488         wl->tx_queue_count++;
 489         spin_unlock_irqrestore(&wl->wl_lock, flags);
 490 }
 491
 492 void wl1271_tx_work_locked(struct wl1271 *wl)
 493 {
 494         struct sk_buff *skb;
 495         bool woken_up = false;
 496         u32 buf_offset = 0;
 497         bool sent_packets = false;
 498         int ret;
 499
 500         if (unlikely(wl->state == WL1271_STATE_OFF))
 501                 goto out;
 502
 503         while ((skb = wl1271_skb_dequeue(wl))) {
 504                 if (!woken_up) {
 505                         ret = wl1271_ps_elp_wakeup(wl);
 506                         if (ret < 0)
 507                                 goto out_ack;
 508                         woken_up = true;
 509                 }
 510
 511                 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
 512                 if (ret == -EAGAIN) {
 513                         /*
 514                          * Aggregation buffer is full.
 515                          * Flush buffer and try again.
 516                          */
 517                         wl1271_skb_queue_head(wl, skb);
 518                         wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 519                                      buf_offset, true);
 520                         sent_packets = true;
 521                         buf_offset = 0;
 522                         continue;
 523                 } else if (ret == -EBUSY) {
 524                         /*
 525                          * Firmware buffer is full.
 526                          * Queue back last skb, and stop aggregating.
 527                          */
 528                         wl1271_skb_queue_head(wl, skb);
 529                         /* No work left, avoid scheduling redundant tx work */
 530                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 531                         goto out_ack;
 532                 } else if (ret < 0) {
 533                         dev_kfree_skb(skb);
 534                         goto out_ack;
 535                 }
 536                 buf_offset += ret;
 537                 wl->tx_packets_count++;
 538         }
 539
 540 out_ack:
 541         if (buf_offset) {
 542                 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 543                                 buf_offset, true);
 544                 sent_packets = true;
 545         }
 546         if (sent_packets) {
 547                 /*
 548                  * Interrupt the firmware with the new packets. This is only
 549                  * required for older hardware revisions
 550                  */
 551                 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
 552                         wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
 553                                        wl->tx_packets_count);
 554
 555                 wl1271_handle_tx_low_watermark(wl);
 556         }
 557
 558 out:
 559         if (woken_up)
 560                 wl1271_ps_elp_sleep(wl);
 561 }
 562
 563 void wl1271_tx_work(struct work_struct *work)
 564 {
 565         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 566
 567         mutex_lock(&wl->mutex);
 568         wl1271_tx_work_locked(wl);
 569         mutex_unlock(&wl->mutex);
 570 }
 571
 572 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 573                                       struct wl1271_tx_hw_res_descr *result)
 574 {
 575         struct ieee80211_tx_info *info;
 576         struct sk_buff *skb;
 577         int id = result->id;
 578         int rate = -1;
 579         u8 retries = 0;
 580
 581         /* check for id legality */
 582         if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
 583                 wl1271_warning("TX result illegal id: %d", id);
 584                 return;
 585         }
 586
 587         skb = wl->tx_frames[id];
 588         info = IEEE80211_SKB_CB(skb);
 589
 590         /* update the TX status info */
 591         if (result->status == TX_SUCCESS) {
 592                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 593                         info->flags |= IEEE80211_TX_STAT_ACK;
 594                 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
 595                 retries = result->ack_failures;
 596         } else if (result->status == TX_RETRY_EXCEEDED) {
 597                 wl->stats.excessive_retries++;
 598                 retries = result->ack_failures;
 599         }
 600
 601         info->status.rates[0].idx = rate;
 602         info->status.rates[0].count = retries;
 603         info->status.rates[0].flags = 0;
 604         info->status.ack_signal = -1;
 605
 606         wl->stats.retry_count += result->ack_failures;
 607
 608         /* update security sequence number */
 609         wl->tx_security_seq += (result->lsb_security_sequence_number -
 610                                 wl->tx_security_last_seq);
 611         wl->tx_security_last_seq = result->lsb_security_sequence_number;
 612
 613         /* remove private header from packet */
 614         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 615
 616         /* remove TKIP header space if present */
 617         if (info->control.hw_key &&
 618             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 619                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 620                 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
 621                 skb_pull(skb, WL1271_TKIP_IV_SPACE);
 622         }
 623
 624         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 625                      " status 0x%x",
 626                      result->id, skb, result->ack_failures,
 627                      result->rate_class_index, result->status);
 628
 629         /* return the packet to the stack */
 630         skb_queue_tail(&wl->deferred_tx_queue, skb);
 631         ieee80211_queue_work(wl->hw, &wl->netstack_work);
 632         wl1271_free_tx_id(wl, result->id);
 633 }
 634
 635 /* Called upon reception of a TX complete interrupt */
 636 void wl1271_tx_complete(struct wl1271 *wl)
 637 {
 638         struct wl1271_acx_mem_map *memmap =
 639                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 640         u32 count, fw_counter;
 641         u32 i;
 642
 643         /* read the tx results from the chipset */
 644         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 645                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 646         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 647
 648         /* write host counter to chipset (to ack) */
 649         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 650                        offsetof(struct wl1271_tx_hw_res_if,
 651                                 tx_result_host_counter), fw_counter);
 652
 653         count = fw_counter - wl->tx_results_count;
 654         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 655
 656         /* verify that the result buffer is not getting overrun */
 657         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 658                 wl1271_warning("TX result overflow from chipset: %d", count);
 659
 660         /* process the results */
 661         for (i = 0; i < count; i++) {
 662                 struct wl1271_tx_hw_res_descr *result;
 663                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 664
 665                 /* process the packet */
 666                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 667                 wl1271_tx_complete_packet(wl, result);
 668
 669                 wl->tx_results_count++;
 670         }
 671 }
 672
 673 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 674 {
 675         struct sk_buff *skb;
 676         int i, total = 0;
 677         unsigned long flags;
 678         struct ieee80211_tx_info *info;
 679
 680         for (i = 0; i < NUM_TX_QUEUES; i++) {
 681                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 682                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 683                         info = IEEE80211_SKB_CB(skb);
 684                         info->status.rates[0].idx = -1;
 685                         info->status.rates[0].count = 0;
 686                         ieee80211_tx_status(wl->hw, skb);
 687                         total++;
 688                 }
 689         }
 690
 691         spin_lock_irqsave(&wl->wl_lock, flags);
 692         wl->tx_queue_count -= total;
 693         spin_unlock_irqrestore(&wl->wl_lock, flags);
 694
 695         wl1271_handle_tx_low_watermark(wl);
 696 }
 697
 698 /* caller must hold wl->mutex */
 699 void wl1271_tx_reset(struct wl1271 *wl)
 700 {
 701         int i;
 702         struct sk_buff *skb;
 703         struct ieee80211_tx_info *info;
 704
 705         /* TX failure */
 706         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 707                 for (i = 0; i < AP_MAX_LINKS; i++) {
 708                         wl1271_tx_reset_link_queues(wl, i);
 709                         wl->links[i].allocated_blks = 0;
 710                         wl->links[i].prev_freed_blks = 0;
 711                 }
 712
 713                 wl->last_tx_hlid = 0;
 714         } else {
 715                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 716                         while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
 717                                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
 718                                              skb);
 719                                 info = IEEE80211_SKB_CB(skb);
 720                                 info->status.rates[0].idx = -1;
 721                                 info->status.rates[0].count = 0;
 722                                 ieee80211_tx_status(wl->hw, skb);
 723                         }
 724                 }
 725         }
 726
 727         wl->tx_queue_count = 0;
 728
 729         /*
 730          * Make sure the driver is at a consistent state, in case this
 731          * function is called from a context other than interface removal.
 732          */
 733         wl1271_handle_tx_low_watermark(wl);
 734
 735         for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
 736                 if (wl->tx_frames[i] == NULL)
 737                         continue;
 738
 739                 skb = wl->tx_frames[i];
 740                 wl1271_free_tx_id(wl, i);
 741                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 742
 743                 /* Remove private headers before passing the skb to mac80211 */
 744                 info = IEEE80211_SKB_CB(skb);
 745                 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 746                 if (info->control.hw_key &&
 747                     info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 748                         int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 749                         memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data,
 750                                 hdrlen);
 751                         skb_pull(skb, WL1271_TKIP_IV_SPACE);
 752                 }
 753
 754                 info->status.rates[0].idx = -1;
 755                 info->status.rates[0].count = 0;
 756
 757                 ieee80211_tx_status(wl->hw, skb);
 758         }
 759 }
 760
 761 #define WL1271_TX_FLUSH_TIMEOUT 500000
 762
 763 /* caller must *NOT* hold wl->mutex */
 764 void wl1271_tx_flush(struct wl1271 *wl)
 765 {
 766         unsigned long timeout;
 767         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
 768
 769         while (!time_after(jiffies, timeout)) {
 770                 mutex_lock(&wl->mutex);
 771                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
 772                              wl->tx_frames_cnt, wl->tx_queue_count);
 773                 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
 774                         mutex_unlock(&wl->mutex);
 775                         return;
 776                 }
 777                 mutex_unlock(&wl->mutex);
 778                 msleep(1);
 779         }
 780
 781         wl1271_warning("Unable to flush all TX buffers, timed out.");
 782 }
 783
 784 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
 785 {
 786         int i;
 787         u32 rate = 0;
 788
 789         if (!wl->basic_rate_set) {
 790                 WARN_ON(1);
 791                 wl->basic_rate_set = wl->conf.tx.basic_rate;
 792         }
 793
 794         for (i = 0; !rate; i++) {
 795                 if ((wl->basic_rate_set >> i) & 0x1)
 796                         rate = 1 << i;
 797         }
 798
 799         return rate;
 800 }