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         u32 spare_blocks;
 139
 140         if (unlikely(wl->quirks & WL12XX_QUIRK_USE_2_SPARE_BLOCKS))
 141                 spare_blocks = 2;
 142         else
 143                 spare_blocks = 1;
 144
 145         if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
 146                 return -EAGAIN;
 147
 148         /* allocate free identifier for the packet */
 149         id = wl1271_alloc_tx_id(wl, skb);
 150         if (id < 0)
 151                 return id;
 152
 153         /* approximate the number of blocks required for this packet
 154            in the firmware */
 155         if (wl->block_size)
 156                 len = ALIGN(total_len, wl->block_size);
 157         else
 158                 len = total_len;
 159
 160         total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
 161                 spare_blocks;
 162
 163         if (total_blocks <= wl->tx_blocks_available) {
 164                 desc = (struct wl1271_tx_hw_descr *)skb_push(
 165                         skb, total_len - skb->len);
 166
 167                 /* HW descriptor fields change between wl127x and wl128x */
 168                 if (wl->chip.id == CHIP_ID_1283_PG20) {
 169                         desc->wl128x_mem.total_mem_blocks = total_blocks;
 170                 } else {
 171                         desc->wl127x_mem.extra_blocks = spare_blocks;
 172                         desc->wl127x_mem.total_mem_blocks = total_blocks;
 173                 }
 174
 175                 desc->id = id;
 176
 177                 wl->tx_blocks_available -= total_blocks;
 178
 179                 if (wl->bss_type == BSS_TYPE_AP_BSS)
 180                         wl->links[hlid].allocated_blks += total_blocks;
 181
 182                 ret = 0;
 183
 184                 wl1271_debug(DEBUG_TX,
 185                              "tx_allocate: size: %d, blocks: %d, id: %d",
 186                              total_len, total_blocks, id);
 187         } else {
 188                 wl1271_free_tx_id(wl, id);
 189         }
 190
 191         return ret;
 192 }
 193
 194 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
 195                               u32 extra, struct ieee80211_tx_info *control,
 196                               u8 hlid)
 197 {
 198         struct timespec ts;
 199         struct wl1271_tx_hw_descr *desc;
 200         int aligned_len, ac, rate_idx;
 201         s64 hosttime;
 202         u16 tx_attr;
 203
 204         desc = (struct wl1271_tx_hw_descr *) skb->data;
 205
 206         /* relocate space for security header */
 207         if (extra) {
 208                 void *framestart = skb->data + sizeof(*desc);
 209                 u16 fc = *(u16 *)(framestart + extra);
 210                 int hdrlen = ieee80211_hdrlen(cpu_to_le16(fc));
 211                 memmove(framestart, framestart + extra, hdrlen);
 212         }
 213
 214         /* configure packet life time */
 215         getnstimeofday(&ts);
 216         hosttime = (timespec_to_ns(&ts) >> 10);
 217         desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
 218
 219         if (wl->bss_type != BSS_TYPE_AP_BSS)
 220                 desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
 221         else
 222                 desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
 223
 224         /* queue */
 225         ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 226         desc->tid = skb->priority;
 227
 228         if (skb->pkt_type == TX_PKT_TYPE_DUMMY_REQ) {
 229                 /*
 230                  * FW expects the dummy packet to have an invalid session id -
 231                  * any session id that is different than the one set in the join
 232                  */
 233                 tx_attr = ((~wl->session_counter) <<
 234                            TX_HW_ATTR_OFST_SESSION_COUNTER) &
 235                            TX_HW_ATTR_SESSION_COUNTER;
 236
 237                 tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
 238         } else {
 239                 /* configure the tx attributes */
 240                 tx_attr =
 241                         wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
 242         }
 243
 244         if (wl->bss_type != BSS_TYPE_AP_BSS) {
 245                 desc->aid = hlid;
 246
 247                 /* if the packets are destined for AP (have a STA entry)
 248                    send them with AP rate policies, otherwise use default
 249                    basic rates */
 250                 if (control->control.sta)
 251                         rate_idx = ACX_TX_AP_FULL_RATE;
 252                 else
 253                         rate_idx = ACX_TX_BASIC_RATE;
 254         } else {
 255                 desc->hlid = hlid;
 256                 switch (hlid) {
 257                 case WL1271_AP_GLOBAL_HLID:
 258                         rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
 259                         break;
 260                 case WL1271_AP_BROADCAST_HLID:
 261                         rate_idx = ACX_TX_AP_MODE_BCST_RATE;
 262                         break;
 263                 default:
 264                         rate_idx = ac;
 265                         break;
 266                 }
 267         }
 268
 269         tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
 270         desc->reserved = 0;
 271
 272         if (wl->block_size) {
 273                 aligned_len = ALIGN(skb->len, wl->block_size);
 274
 275                 desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
 276                 desc->length = cpu_to_le16(aligned_len >> 2);
 277
 278                 wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
 279                              "tx_attr: 0x%x len: %d life: %d mem: %d",
 280                              desc->hlid, tx_attr,
 281                              le16_to_cpu(desc->length),
 282                              le16_to_cpu(desc->life_time),
 283                              desc->wl128x_mem.total_mem_blocks);
 284         } else {
 285                 int pad;
 286
 287                 /* align the length (and store in terms of words) */
 288                 aligned_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 289                 desc->length = cpu_to_le16(aligned_len >> 2);
 290
 291                 /* calculate number of padding bytes */
 292                 pad = aligned_len - skb->len;
 293                 tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
 294
 295                 wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
 296                              "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
 297                              desc->hlid, tx_attr,
 298                              le16_to_cpu(desc->length),
 299                              le16_to_cpu(desc->life_time),
 300                              desc->wl127x_mem.total_mem_blocks);
 301         }
 302
 303         desc->tx_attr = cpu_to_le16(tx_attr);
 304 }
 305
 306 /* caller must hold wl->mutex */
 307 static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
 308                                                         u32 buf_offset)
 309 {
 310         struct ieee80211_tx_info *info;
 311         u32 extra = 0;
 312         int ret = 0;
 313         u32 total_len;
 314         u8 hlid;
 315
 316         if (!skb)
 317                 return -EINVAL;
 318
 319         info = IEEE80211_SKB_CB(skb);
 320
 321         if (info->control.hw_key &&
 322             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
 323                 extra = WL1271_TKIP_IV_SPACE;
 324
 325         if (info->control.hw_key) {
 326                 bool is_wep;
 327                 u8 idx = info->control.hw_key->hw_key_idx;
 328                 u32 cipher = info->control.hw_key->cipher;
 329
 330                 is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
 331                          (cipher == WLAN_CIPHER_SUITE_WEP104);
 332
 333                 if (unlikely(is_wep && wl->default_key != idx)) {
 334                         ret = wl1271_set_default_wep_key(wl, idx);
 335                         if (ret < 0)
 336                                 return ret;
 337                         wl->default_key = idx;
 338                 }
 339         }
 340
 341         if (wl->bss_type == BSS_TYPE_AP_BSS)
 342                 hlid = wl1271_tx_get_hlid(skb);
 343         else
 344                 hlid = TX_HW_DEFAULT_AID;
 345
 346         ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
 347         if (ret < 0)
 348                 return ret;
 349
 350         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 351                 wl1271_tx_ap_update_inconnection_sta(wl, skb);
 352                 wl1271_tx_regulate_link(wl, hlid);
 353         }
 354
 355         wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
 356
 357         /*
 358          * The length of each packet is stored in terms of
 359          * words. Thus, we must pad the skb data to make sure its
 360          * length is aligned.  The number of padding bytes is computed
 361          * and set in wl1271_tx_fill_hdr.
 362          * In special cases, we want to align to a specific block size
 363          * (eg. for wl128x with SDIO we align to 256).
 364          */
 365         if (wl->block_size)
 366                 total_len = ALIGN(skb->len, wl->block_size);
 367         else
 368                 total_len = ALIGN(skb->len, WL1271_TX_ALIGN_TO);
 369
 370         memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
 371         memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
 372
 373         return total_len;
 374 }
 375
 376 u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set)
 377 {
 378         struct ieee80211_supported_band *band;
 379         u32 enabled_rates = 0;
 380         int bit;
 381
 382         band = wl->hw->wiphy->bands[wl->band];
 383         for (bit = 0; bit < band->n_bitrates; bit++) {
 384                 if (rate_set & 0x1)
 385                         enabled_rates |= band->bitrates[bit].hw_value;
 386                 rate_set >>= 1;
 387         }
 388
 389 #ifdef CONFIG_WL12XX_HT
 390         /* MCS rates indication are on bits 16 - 23 */
 391         rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
 392
 393         for (bit = 0; bit < 8; bit++) {
 394                 if (rate_set & 0x1)
 395                         enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
 396                 rate_set >>= 1;
 397         }
 398 #endif
 399
 400         return enabled_rates;
 401 }
 402
 403 void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
 404 {
 405         unsigned long flags;
 406
 407         if (test_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags) &&
 408             wl->tx_queue_count <= WL1271_TX_QUEUE_LOW_WATERMARK) {
 409                 /* firmware buffer has space, restart queues */
 410                 spin_lock_irqsave(&wl->wl_lock, flags);
 411                 ieee80211_wake_queues(wl->hw);
 412                 clear_bit(WL1271_FLAG_TX_QUEUE_STOPPED, &wl->flags);
 413                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 414         }
 415 }
 416
 417 static struct sk_buff *wl1271_sta_skb_dequeue(struct wl1271 *wl)
 418 {
 419         struct sk_buff *skb = NULL;
 420         unsigned long flags;
 421
 422         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VO]);
 423         if (skb)
 424                 goto out;
 425         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_VI]);
 426         if (skb)
 427                 goto out;
 428         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BE]);
 429         if (skb)
 430                 goto out;
 431         skb = skb_dequeue(&wl->tx_queue[CONF_TX_AC_BK]);
 432
 433 out:
 434         if (skb) {
 435                 spin_lock_irqsave(&wl->wl_lock, flags);
 436                 wl->tx_queue_count--;
 437                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 438         }
 439
 440         return skb;
 441 }
 442
 443 static struct sk_buff *wl1271_ap_skb_dequeue(struct wl1271 *wl)
 444 {
 445         struct sk_buff *skb = NULL;
 446         unsigned long flags;
 447         int i, h, start_hlid;
 448
 449         /* start from the link after the last one */
 450         start_hlid = (wl->last_tx_hlid + 1) % AP_MAX_LINKS;
 451
 452         /* dequeue according to AC, round robin on each link */
 453         for (i = 0; i < AP_MAX_LINKS; i++) {
 454                 h = (start_hlid + i) % AP_MAX_LINKS;
 455
 456                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VO]);
 457                 if (skb)
 458                         goto out;
 459                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_VI]);
 460                 if (skb)
 461                         goto out;
 462                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BE]);
 463                 if (skb)
 464                         goto out;
 465                 skb = skb_dequeue(&wl->links[h].tx_queue[CONF_TX_AC_BK]);
 466                 if (skb)
 467                         goto out;
 468         }
 469
 470 out:
 471         if (skb) {
 472                 wl->last_tx_hlid = h;
 473                 spin_lock_irqsave(&wl->wl_lock, flags);
 474                 wl->tx_queue_count--;
 475                 spin_unlock_irqrestore(&wl->wl_lock, flags);
 476         } else {
 477                 wl->last_tx_hlid = 0;
 478         }
 479
 480         return skb;
 481 }
 482
 483 static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
 484 {
 485         if (wl->bss_type == BSS_TYPE_AP_BSS)
 486                 return wl1271_ap_skb_dequeue(wl);
 487
 488         return wl1271_sta_skb_dequeue(wl);
 489 }
 490
 491 static void wl1271_skb_queue_head(struct wl1271 *wl, struct sk_buff *skb)
 492 {
 493         unsigned long flags;
 494         int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
 495
 496         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 497                 u8 hlid = wl1271_tx_get_hlid(skb);
 498                 skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
 499
 500                 /* make sure we dequeue the same packet next time */
 501                 wl->last_tx_hlid = (hlid + AP_MAX_LINKS - 1) % AP_MAX_LINKS;
 502         } else {
 503                 skb_queue_head(&wl->tx_queue[q], skb);
 504         }
 505
 506         spin_lock_irqsave(&wl->wl_lock, flags);
 507         wl->tx_queue_count++;
 508         spin_unlock_irqrestore(&wl->wl_lock, flags);
 509 }
 510
 511 void wl1271_tx_work_locked(struct wl1271 *wl)
 512 {
 513         struct sk_buff *skb;
 514         bool woken_up = false;
 515         u32 buf_offset = 0;
 516         bool sent_packets = false;
 517         int ret;
 518
 519         if (unlikely(wl->state == WL1271_STATE_OFF))
 520                 goto out;
 521
 522         while ((skb = wl1271_skb_dequeue(wl))) {
 523                 if (!woken_up) {
 524                         ret = wl1271_ps_elp_wakeup(wl);
 525                         if (ret < 0)
 526                                 goto out_ack;
 527                         woken_up = true;
 528                 }
 529
 530                 ret = wl1271_prepare_tx_frame(wl, skb, buf_offset);
 531                 if (ret == -EAGAIN) {
 532                         /*
 533                          * Aggregation buffer is full.
 534                          * Flush buffer and try again.
 535                          */
 536                         wl1271_skb_queue_head(wl, skb);
 537                         wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 538                                      buf_offset, true);
 539                         sent_packets = true;
 540                         buf_offset = 0;
 541                         continue;
 542                 } else if (ret == -EBUSY) {
 543                         /*
 544                          * Firmware buffer is full.
 545                          * Queue back last skb, and stop aggregating.
 546                          */
 547                         wl1271_skb_queue_head(wl, skb);
 548                         /* No work left, avoid scheduling redundant tx work */
 549                         set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 550                         goto out_ack;
 551                 } else if (ret < 0) {
 552                         dev_kfree_skb(skb);
 553                         goto out_ack;
 554                 }
 555                 buf_offset += ret;
 556                 wl->tx_packets_count++;
 557         }
 558
 559 out_ack:
 560         if (buf_offset) {
 561                 wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 562                                 buf_offset, true);
 563                 sent_packets = true;
 564         }
 565         if (sent_packets) {
 566                 /*
 567                  * Interrupt the firmware with the new packets. This is only
 568                  * required for older hardware revisions
 569                  */
 570                 if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
 571                         wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
 572                                        wl->tx_packets_count);
 573
 574                 wl1271_handle_tx_low_watermark(wl);
 575         }
 576
 577 out:
 578         if (woken_up)
 579                 wl1271_ps_elp_sleep(wl);
 580 }
 581
 582 void wl1271_tx_work(struct work_struct *work)
 583 {
 584         struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
 585
 586         mutex_lock(&wl->mutex);
 587         wl1271_tx_work_locked(wl);
 588         mutex_unlock(&wl->mutex);
 589 }
 590
 591 static void wl1271_tx_complete_packet(struct wl1271 *wl,
 592                                       struct wl1271_tx_hw_res_descr *result)
 593 {
 594         struct ieee80211_tx_info *info;
 595         struct sk_buff *skb;
 596         int id = result->id;
 597         int rate = -1;
 598         u8 retries = 0;
 599
 600         /* check for id legality */
 601         if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
 602                 wl1271_warning("TX result illegal id: %d", id);
 603                 return;
 604         }
 605
 606         skb = wl->tx_frames[id];
 607         info = IEEE80211_SKB_CB(skb);
 608
 609         if (skb->pkt_type == TX_PKT_TYPE_DUMMY_REQ) {
 610                 dev_kfree_skb(skb);
 611                 wl1271_free_tx_id(wl, id);
 612                 return;
 613         }
 614
 615         /* update the TX status info */
 616         if (result->status == TX_SUCCESS) {
 617                 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 618                         info->flags |= IEEE80211_TX_STAT_ACK;
 619                 rate = wl1271_rate_to_idx(result->rate_class_index, wl->band);
 620                 retries = result->ack_failures;
 621         } else if (result->status == TX_RETRY_EXCEEDED) {
 622                 wl->stats.excessive_retries++;
 623                 retries = result->ack_failures;
 624         }
 625
 626         info->status.rates[0].idx = rate;
 627         info->status.rates[0].count = retries;
 628         info->status.rates[0].flags = 0;
 629         info->status.ack_signal = -1;
 630
 631         wl->stats.retry_count += result->ack_failures;
 632
 633         /* update security sequence number */
 634         wl->tx_security_seq += (result->lsb_security_sequence_number -
 635                                 wl->tx_security_last_seq);
 636         wl->tx_security_last_seq = result->lsb_security_sequence_number;
 637
 638         /* remove private header from packet */
 639         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 640
 641         /* remove TKIP header space if present */
 642         if (info->control.hw_key &&
 643             info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 644                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 645                 memmove(skb->data + WL1271_TKIP_IV_SPACE, skb->data, hdrlen);
 646                 skb_pull(skb, WL1271_TKIP_IV_SPACE);
 647         }
 648
 649         wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
 650                      " status 0x%x",
 651                      result->id, skb, result->ack_failures,
 652                      result->rate_class_index, result->status);
 653
 654         /* return the packet to the stack */
 655         skb_queue_tail(&wl->deferred_tx_queue, skb);
 656         ieee80211_queue_work(wl->hw, &wl->netstack_work);
 657         wl1271_free_tx_id(wl, result->id);
 658 }
 659
 660 /* Called upon reception of a TX complete interrupt */
 661 void wl1271_tx_complete(struct wl1271 *wl)
 662 {
 663         struct wl1271_acx_mem_map *memmap =
 664                 (struct wl1271_acx_mem_map *)wl->target_mem_map;
 665         u32 count, fw_counter;
 666         u32 i;
 667
 668         /* read the tx results from the chipset */
 669         wl1271_read(wl, le32_to_cpu(memmap->tx_result),
 670                     wl->tx_res_if, sizeof(*wl->tx_res_if), false);
 671         fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
 672
 673         /* write host counter to chipset (to ack) */
 674         wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
 675                        offsetof(struct wl1271_tx_hw_res_if,
 676                                 tx_result_host_counter), fw_counter);
 677
 678         count = fw_counter - wl->tx_results_count;
 679         wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
 680
 681         /* verify that the result buffer is not getting overrun */
 682         if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
 683                 wl1271_warning("TX result overflow from chipset: %d", count);
 684
 685         /* process the results */
 686         for (i = 0; i < count; i++) {
 687                 struct wl1271_tx_hw_res_descr *result;
 688                 u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
 689
 690                 /* process the packet */
 691                 result =  &(wl->tx_res_if->tx_results_queue[offset]);
 692                 wl1271_tx_complete_packet(wl, result);
 693
 694                 wl->tx_results_count++;
 695         }
 696 }
 697
 698 void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
 699 {
 700         struct sk_buff *skb;
 701         int i, total = 0;
 702         unsigned long flags;
 703         struct ieee80211_tx_info *info;
 704
 705         for (i = 0; i < NUM_TX_QUEUES; i++) {
 706                 while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
 707                         wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
 708                         info = IEEE80211_SKB_CB(skb);
 709                         info->status.rates[0].idx = -1;
 710                         info->status.rates[0].count = 0;
 711                         ieee80211_tx_status(wl->hw, skb);
 712                         total++;
 713                 }
 714         }
 715
 716         spin_lock_irqsave(&wl->wl_lock, flags);
 717         wl->tx_queue_count -= total;
 718         spin_unlock_irqrestore(&wl->wl_lock, flags);
 719
 720         wl1271_handle_tx_low_watermark(wl);
 721 }
 722
 723 /* caller must hold wl->mutex */
 724 void wl1271_tx_reset(struct wl1271 *wl)
 725 {
 726         int i;
 727         struct sk_buff *skb;
 728         struct ieee80211_tx_info *info;
 729
 730         /* TX failure */
 731         if (wl->bss_type == BSS_TYPE_AP_BSS) {
 732                 for (i = 0; i < AP_MAX_LINKS; i++) {
 733                         wl1271_tx_reset_link_queues(wl, i);
 734                         wl->links[i].allocated_blks = 0;
 735                         wl->links[i].prev_freed_blks = 0;
 736                 }
 737
 738                 wl->last_tx_hlid = 0;
 739         } else {
 740                 for (i = 0; i < NUM_TX_QUEUES; i++) {
 741                         while ((skb = skb_dequeue(&wl->tx_queue[i]))) {
 742                                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p",
 743                                              skb);
 744
 745                                 if (skb->pkt_type == TX_PKT_TYPE_DUMMY_REQ) {
 746                                         dev_kfree_skb(skb);
 747                                 } else {
 748                                         info = IEEE80211_SKB_CB(skb);
 749                                         info->status.rates[0].idx = -1;
 750                                         info->status.rates[0].count = 0;
 751                                         ieee80211_tx_status(wl->hw, skb);
 752                                 }
 753                         }
 754                 }
 755         }
 756
 757         wl->tx_queue_count = 0;
 758
 759         /*
 760          * Make sure the driver is at a consistent state, in case this
 761          * function is called from a context other than interface removal.
 762          */
 763         wl1271_handle_tx_low_watermark(wl);
 764
 765         for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
 766                 if (wl->tx_frames[i] == NULL)
 767                         continue;
 768
 769                 skb = wl->tx_frames[i];
 770                 wl1271_free_tx_id(wl, i);
 771                 wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
 772
 773                 if (skb->pkt_type == TX_PKT_TYPE_DUMMY_REQ) {
 774                         dev_kfree_skb(skb);
 775                 } else {
 776                         /*
 777                          * Remove private headers before passing the skb to
 778                          * mac80211
 779                          */
 780                         info = IEEE80211_SKB_CB(skb);
 781                         skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
 782                         if (info->control.hw_key &&
 783                             info->control.hw_key->cipher ==
 784                             WLAN_CIPHER_SUITE_TKIP) {
 785                                 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 786                                 memmove(skb->data + WL1271_TKIP_IV_SPACE,
 787                                         skb->data, hdrlen);
 788                                 skb_pull(skb, WL1271_TKIP_IV_SPACE);
 789                         }
 790
 791                         info->status.rates[0].idx = -1;
 792                         info->status.rates[0].count = 0;
 793
 794                         ieee80211_tx_status(wl->hw, skb);
 795                 }
 796         }
 797 }
 798
 799 #define WL1271_TX_FLUSH_TIMEOUT 500000
 800
 801 /* caller must *NOT* hold wl->mutex */
 802 void wl1271_tx_flush(struct wl1271 *wl)
 803 {
 804         unsigned long timeout;
 805         timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
 806
 807         while (!time_after(jiffies, timeout)) {
 808                 mutex_lock(&wl->mutex);
 809                 wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
 810                              wl->tx_frames_cnt, wl->tx_queue_count);
 811                 if ((wl->tx_frames_cnt == 0) && (wl->tx_queue_count == 0)) {
 812                         mutex_unlock(&wl->mutex);
 813                         return;
 814                 }
 815                 mutex_unlock(&wl->mutex);
 816                 msleep(1);
 817         }
 818
 819         wl1271_warning("Unable to flush all TX buffers, timed out.");
 820 }
 821
 822 u32 wl1271_tx_min_rate_get(struct wl1271 *wl)
 823 {
 824         int i;
 825         u32 rate = 0;
 826
 827         if (!wl->basic_rate_set) {
 828                 WARN_ON(1);
 829                 wl->basic_rate_set = wl->conf.tx.basic_rate;
 830         }
 831
 832         for (i = 0; !rate; i++) {
 833                 if ((wl->basic_rate_set >> i) & 0x1)
 834                         rate = 1 << i;
 835         }
 836
 837         return rate;
 838 }