drivers/net/wireless/b43/xmit.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4
   5   Transmission (TX/RX) related functions.
   6
   7   Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
   8   Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
   9   Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de>
  10   Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
  11   Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  12
  13   This program is free software; you can redistribute it and/or modify
  14   it under the terms of the GNU General Public License as published by
  15   the Free Software Foundation; either version 2 of the License, or
  16   (at your option) any later version.
  17
  18   This program is distributed in the hope that it will be useful,
  19   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21   GNU General Public License for more details.
  22
  23   You should have received a copy of the GNU General Public License
  24   along with this program; see the file COPYING.  If not, write to
  25   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  26   Boston, MA 02110-1301, USA.
  27
  28 */
  29
  30 #include "xmit.h"
  31 #include "phy_common.h"
  32 #include "dma.h"
  33 #include "pio.h"
  34
  35
  36 /* Extract the bitrate index out of a CCK PLCP header. */
  37 static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
  38 {
  39         switch (plcp->raw[0]) {
  40         case 0x0A:
  41                 return 0;
  42         case 0x14:
  43                 return 1;
  44         case 0x37:
  45                 return 2;
  46         case 0x6E:
  47                 return 3;
  48         }
  49         return -1;
  50 }
  51
  52 /* Extract the bitrate index out of an OFDM PLCP header. */
  53 static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
  54 {
  55         int base = aphy ? 0 : 4;
  56
  57         switch (plcp->raw[0] & 0xF) {
  58         case 0xB:
  59                 return base + 0;
  60         case 0xF:
  61                 return base + 1;
  62         case 0xA:
  63                 return base + 2;
  64         case 0xE:
  65                 return base + 3;
  66         case 0x9:
  67                 return base + 4;
  68         case 0xD:
  69                 return base + 5;
  70         case 0x8:
  71                 return base + 6;
  72         case 0xC:
  73                 return base + 7;
  74         }
  75         return -1;
  76 }
  77
  78 u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
  79 {
  80         switch (bitrate) {
  81         case B43_CCK_RATE_1MB:
  82                 return 0x0A;
  83         case B43_CCK_RATE_2MB:
  84                 return 0x14;
  85         case B43_CCK_RATE_5MB:
  86                 return 0x37;
  87         case B43_CCK_RATE_11MB:
  88                 return 0x6E;
  89         }
  90         B43_WARN_ON(1);
  91         return 0;
  92 }
  93
  94 u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
  95 {
  96         switch (bitrate) {
  97         case B43_OFDM_RATE_6MB:
  98                 return 0xB;
  99         case B43_OFDM_RATE_9MB:
 100                 return 0xF;
 101         case B43_OFDM_RATE_12MB:
 102                 return 0xA;
 103         case B43_OFDM_RATE_18MB:
 104                 return 0xE;
 105         case B43_OFDM_RATE_24MB:
 106                 return 0x9;
 107         case B43_OFDM_RATE_36MB:
 108                 return 0xD;
 109         case B43_OFDM_RATE_48MB:
 110                 return 0x8;
 111         case B43_OFDM_RATE_54MB:
 112                 return 0xC;
 113         }
 114         B43_WARN_ON(1);
 115         return 0;
 116 }
 117
 118 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
 119                            const u16 octets, const u8 bitrate)
 120 {
 121         __u8 *raw = plcp->raw;
 122
 123         if (b43_is_ofdm_rate(bitrate)) {
 124                 u32 d;
 125
 126                 d = b43_plcp_get_ratecode_ofdm(bitrate);
 127                 B43_WARN_ON(octets & 0xF000);
 128                 d |= (octets << 5);
 129                 plcp->data = cpu_to_le32(d);
 130         } else {
 131                 u32 plen;
 132
 133                 plen = octets * 16 / bitrate;
 134                 if ((octets * 16 % bitrate) > 0) {
 135                         plen++;
 136                         if ((bitrate == B43_CCK_RATE_11MB)
 137                             && ((octets * 8 % 11) < 4)) {
 138                                 raw[1] = 0x84;
 139                         } else
 140                                 raw[1] = 0x04;
 141                 } else
 142                         raw[1] = 0x04;
 143                 plcp->data |= cpu_to_le32(plen << 16);
 144                 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
 145         }
 146 }
 147
 148 static u8 b43_calc_fallback_rate(u8 bitrate)
 149 {
 150         switch (bitrate) {
 151         case B43_CCK_RATE_1MB:
 152                 return B43_CCK_RATE_1MB;
 153         case B43_CCK_RATE_2MB:
 154                 return B43_CCK_RATE_1MB;
 155         case B43_CCK_RATE_5MB:
 156                 return B43_CCK_RATE_2MB;
 157         case B43_CCK_RATE_11MB:
 158                 return B43_CCK_RATE_5MB;
 159         case B43_OFDM_RATE_6MB:
 160                 return B43_CCK_RATE_5MB;
 161         case B43_OFDM_RATE_9MB:
 162                 return B43_OFDM_RATE_6MB;
 163         case B43_OFDM_RATE_12MB:
 164                 return B43_OFDM_RATE_9MB;
 165         case B43_OFDM_RATE_18MB:
 166                 return B43_OFDM_RATE_12MB;
 167         case B43_OFDM_RATE_24MB:
 168                 return B43_OFDM_RATE_18MB;
 169         case B43_OFDM_RATE_36MB:
 170                 return B43_OFDM_RATE_24MB;
 171         case B43_OFDM_RATE_48MB:
 172                 return B43_OFDM_RATE_36MB;
 173         case B43_OFDM_RATE_54MB:
 174                 return B43_OFDM_RATE_48MB;
 175         }
 176         B43_WARN_ON(1);
 177         return 0;
 178 }
 179
 180 /* Generate a TX data header. */
 181 int b43_generate_txhdr(struct b43_wldev *dev,
 182                        u8 *_txhdr,
 183                        const unsigned char *fragment_data,
 184                        unsigned int fragment_len,
 185                        struct ieee80211_tx_info *info,
 186                        u16 cookie)
 187 {
 188         struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
 189         const struct b43_phy *phy = &dev->phy;
 190         const struct ieee80211_hdr *wlhdr =
 191             (const struct ieee80211_hdr *)fragment_data;
 192         int use_encryption = !!info->control.hw_key;
 193         __le16 fctl = wlhdr->frame_control;
 194         struct ieee80211_rate *fbrate;
 195         u8 rate, rate_fb;
 196         int rate_ofdm, rate_fb_ofdm;
 197         unsigned int plcp_fragment_len;
 198         u32 mac_ctl = 0;
 199         u16 phy_ctl = 0;
 200         u8 extra_ft = 0;
 201         struct ieee80211_rate *txrate;
 202         struct ieee80211_tx_rate *rates;
 203
 204         memset(txhdr, 0, sizeof(*txhdr));
 205
 206         txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
 207         rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
 208         rate_ofdm = b43_is_ofdm_rate(rate);
 209         fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
 210         rate_fb = fbrate->hw_value;
 211         rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
 212
 213         if (rate_ofdm)
 214                 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
 215         else
 216                 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
 217         txhdr->mac_frame_ctl = wlhdr->frame_control;
 218         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 219
 220         /* Calculate duration for fallback rate */
 221         if ((rate_fb == rate) ||
 222             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 223             (wlhdr->duration_id == cpu_to_le16(0))) {
 224                 /* If the fallback rate equals the normal rate or the
 225                  * dur_id field contains an AID, CFP magic or 0,
 226                  * use the original dur_id field. */
 227                 txhdr->dur_fb = wlhdr->duration_id;
 228         } else {
 229                 txhdr->dur_fb = ieee80211_generic_frame_duration(
 230                         dev->wl->hw, info->control.vif, fragment_len, fbrate);
 231         }
 232
 233         plcp_fragment_len = fragment_len + FCS_LEN;
 234         if (use_encryption) {
 235                 u8 key_idx = info->control.hw_key->hw_key_idx;
 236                 struct b43_key *key;
 237                 int wlhdr_len;
 238                 size_t iv_len;
 239
 240                 B43_WARN_ON(key_idx >= dev->max_nr_keys);
 241                 key = &(dev->key[key_idx]);
 242
 243                 if (unlikely(!key->keyconf)) {
 244                         /* This key is invalid. This might only happen
 245                          * in a short timeframe after machine resume before
 246                          * we were able to reconfigure keys.
 247                          * Drop this packet completely. Do not transmit it
 248                          * unencrypted to avoid leaking information. */
 249                         return -ENOKEY;
 250                 }
 251
 252                 /* Hardware appends ICV. */
 253                 plcp_fragment_len += info->control.hw_key->icv_len;
 254
 255                 key_idx = b43_kidx_to_fw(dev, key_idx);
 256                 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
 257                            B43_TXH_MAC_KEYIDX;
 258                 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
 259                            B43_TXH_MAC_KEYALG;
 260                 wlhdr_len = ieee80211_hdrlen(fctl);
 261                 iv_len = min((size_t) info->control.hw_key->iv_len,
 262                              ARRAY_SIZE(txhdr->iv));
 263                 memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
 264         }
 265         if (b43_is_old_txhdr_format(dev)) {
 266                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
 267                                       plcp_fragment_len, rate);
 268         } else {
 269                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
 270                                       plcp_fragment_len, rate);
 271         }
 272         b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
 273                               plcp_fragment_len, rate_fb);
 274
 275         /* Extra Frame Types */
 276         if (rate_fb_ofdm)
 277                 extra_ft |= B43_TXH_EFT_FB_OFDM;
 278         else
 279                 extra_ft |= B43_TXH_EFT_FB_CCK;
 280
 281         /* Set channel radio code. Note that the micrcode ORs 0x100 to
 282          * this value before comparing it to the value in SHM, if this
 283          * is a 5Ghz packet.
 284          */
 285         txhdr->chan_radio_code = phy->channel;
 286
 287         /* PHY TX Control word */
 288         if (rate_ofdm)
 289                 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
 290         else
 291                 phy_ctl |= B43_TXH_PHY_ENC_CCK;
 292         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 293                 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
 294
 295         switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
 296         case 0: /* Default */
 297                 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
 298                 break;
 299         case 1: /* Antenna 0 */
 300                 phy_ctl |= B43_TXH_PHY_ANT0;
 301                 break;
 302         case 2: /* Antenna 1 */
 303                 phy_ctl |= B43_TXH_PHY_ANT1;
 304                 break;
 305         case 3: /* Antenna 2 */
 306                 phy_ctl |= B43_TXH_PHY_ANT2;
 307                 break;
 308         case 4: /* Antenna 3 */
 309                 phy_ctl |= B43_TXH_PHY_ANT3;
 310                 break;
 311         default:
 312                 B43_WARN_ON(1);
 313         }
 314
 315         rates = info->control.rates;
 316         /* MAC control */
 317         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 318                 mac_ctl |= B43_TXH_MAC_ACK;
 319         /* use hardware sequence counter as the non-TID counter */
 320         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 321                 mac_ctl |= B43_TXH_MAC_HWSEQ;
 322         if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 323                 mac_ctl |= B43_TXH_MAC_STMSDU;
 324         if (phy->type == B43_PHYTYPE_A)
 325                 mac_ctl |= B43_TXH_MAC_5GHZ;
 326
 327         /* Overwrite rates[0].count to make the retry calculation
 328          * in the tx status easier. need the actual retry limit to
 329          * detect whether the fallback rate was used.
 330          */
 331         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 332             (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
 333                 rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
 334                 mac_ctl |= B43_TXH_MAC_LONGFRAME;
 335         } else {
 336                 rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
 337         }
 338
 339         /* Generate the RTS or CTS-to-self frame */
 340         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 341             (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
 342                 unsigned int len;
 343                 struct ieee80211_hdr *hdr;
 344                 int rts_rate, rts_rate_fb;
 345                 int rts_rate_ofdm, rts_rate_fb_ofdm;
 346                 struct b43_plcp_hdr6 *plcp;
 347                 struct ieee80211_rate *rts_cts_rate;
 348
 349                 rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);
 350
 351                 rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
 352                 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
 353                 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
 354                 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
 355
 356                 if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 357                         struct ieee80211_cts *cts;
 358
 359                         if (b43_is_old_txhdr_format(dev)) {
 360                                 cts = (struct ieee80211_cts *)
 361                                         (txhdr->old_format.rts_frame);
 362                         } else {
 363                                 cts = (struct ieee80211_cts *)
 364                                         (txhdr->new_format.rts_frame);
 365                         }
 366                         ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
 367                                                 fragment_data, fragment_len,
 368                                                 info, cts);
 369                         mac_ctl |= B43_TXH_MAC_SENDCTS;
 370                         len = sizeof(struct ieee80211_cts);
 371                 } else {
 372                         struct ieee80211_rts *rts;
 373
 374                         if (b43_is_old_txhdr_format(dev)) {
 375                                 rts = (struct ieee80211_rts *)
 376                                         (txhdr->old_format.rts_frame);
 377                         } else {
 378                                 rts = (struct ieee80211_rts *)
 379                                         (txhdr->new_format.rts_frame);
 380                         }
 381                         ieee80211_rts_get(dev->wl->hw, info->control.vif,
 382                                           fragment_data, fragment_len,
 383                                           info, rts);
 384                         mac_ctl |= B43_TXH_MAC_SENDRTS;
 385                         len = sizeof(struct ieee80211_rts);
 386                 }
 387                 len += FCS_LEN;
 388
 389                 /* Generate the PLCP headers for the RTS/CTS frame */
 390                 if (b43_is_old_txhdr_format(dev))
 391                         plcp = &txhdr->old_format.rts_plcp;
 392                 else
 393                         plcp = &txhdr->new_format.rts_plcp;
 394                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 395                                       len, rts_rate);
 396                 plcp = &txhdr->rts_plcp_fb;
 397                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 398                                       len, rts_rate_fb);
 399
 400                 if (b43_is_old_txhdr_format(dev)) {
 401                         hdr = (struct ieee80211_hdr *)
 402                                 (&txhdr->old_format.rts_frame);
 403                 } else {
 404                         hdr = (struct ieee80211_hdr *)
 405                                 (&txhdr->new_format.rts_frame);
 406                 }
 407                 txhdr->rts_dur_fb = hdr->duration_id;
 408
 409                 if (rts_rate_ofdm) {
 410                         extra_ft |= B43_TXH_EFT_RTS_OFDM;
 411                         txhdr->phy_rate_rts =
 412                             b43_plcp_get_ratecode_ofdm(rts_rate);
 413                 } else {
 414                         extra_ft |= B43_TXH_EFT_RTS_CCK;
 415                         txhdr->phy_rate_rts =
 416                             b43_plcp_get_ratecode_cck(rts_rate);
 417                 }
 418                 if (rts_rate_fb_ofdm)
 419                         extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
 420                 else
 421                         extra_ft |= B43_TXH_EFT_RTSFB_CCK;
 422         }
 423
 424         /* Magic cookie */
 425         if (b43_is_old_txhdr_format(dev))
 426                 txhdr->old_format.cookie = cpu_to_le16(cookie);
 427         else
 428                 txhdr->new_format.cookie = cpu_to_le16(cookie);
 429
 430         /* Apply the bitfields */
 431         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 432         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 433         txhdr->extra_ft = extra_ft;
 434
 435         return 0;
 436 }
 437
 438 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
 439                                u8 in_rssi, int ofdm,
 440                                int adjust_2053, int adjust_2050)
 441 {
 442         struct b43_phy *phy = &dev->phy;
 443         struct b43_phy_g *gphy = phy->g;
 444         s32 tmp;
 445
 446         switch (phy->radio_ver) {
 447         case 0x2050:
 448                 if (ofdm) {
 449                         tmp = in_rssi;
 450                         if (tmp > 127)
 451                                 tmp -= 256;
 452                         tmp *= 73;
 453                         tmp /= 64;
 454                         if (adjust_2050)
 455                                 tmp += 25;
 456                         else
 457                                 tmp -= 3;
 458                 } else {
 459                         if (dev->dev->bus->sprom.
 460                             boardflags_lo & B43_BFL_RSSI) {
 461                                 if (in_rssi > 63)
 462                                         in_rssi = 63;
 463                                 B43_WARN_ON(phy->type != B43_PHYTYPE_G);
 464                                 tmp = gphy->nrssi_lt[in_rssi];
 465                                 tmp = 31 - tmp;
 466                                 tmp *= -131;
 467                                 tmp /= 128;
 468                                 tmp -= 57;
 469                         } else {
 470                                 tmp = in_rssi;
 471                                 tmp = 31 - tmp;
 472                                 tmp *= -149;
 473                                 tmp /= 128;
 474                                 tmp -= 68;
 475                         }
 476                         if (phy->type == B43_PHYTYPE_G && adjust_2050)
 477                                 tmp += 25;
 478                 }
 479                 break;
 480         case 0x2060:
 481                 if (in_rssi > 127)
 482                         tmp = in_rssi - 256;
 483                 else
 484                         tmp = in_rssi;
 485                 break;
 486         default:
 487                 tmp = in_rssi;
 488                 tmp -= 11;
 489                 tmp *= 103;
 490                 tmp /= 64;
 491                 if (adjust_2053)
 492                         tmp -= 109;
 493                 else
 494                         tmp -= 83;
 495         }
 496
 497         return (s8) tmp;
 498 }
 499
 500 //TODO
 501 #if 0
 502 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
 503 {
 504         struct b43_phy *phy = &dev->phy;
 505         s8 ret;
 506
 507         if (phy->type == B43_PHYTYPE_A) {
 508                 //TODO: Incomplete specs.
 509                 ret = 0;
 510         } else
 511                 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
 512
 513         return ret;
 514 }
 515 #endif
 516
 517 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 518 {
 519         struct ieee80211_rx_status status;
 520         struct b43_plcp_hdr6 *plcp;
 521         struct ieee80211_hdr *wlhdr;
 522         const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
 523         __le16 fctl;
 524         u16 phystat0, phystat3, chanstat, mactime;
 525         u32 macstat;
 526         u16 chanid;
 527         u16 phytype;
 528         int padding;
 529
 530         memset(&status, 0, sizeof(status));
 531
 532         /* Get metadata about the frame from the header. */
 533         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 534         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 535         macstat = le32_to_cpu(rxhdr->mac_status);
 536         mactime = le16_to_cpu(rxhdr->mac_time);
 537         chanstat = le16_to_cpu(rxhdr->channel);
 538         phytype = chanstat & B43_RX_CHAN_PHYTYPE;
 539
 540         if (unlikely(macstat & B43_RX_MAC_FCSERR)) {
 541                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 542                 status.flag |= RX_FLAG_FAILED_FCS_CRC;
 543         }
 544         if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV)))
 545                 status.flag |= RX_FLAG_FAILED_PLCP_CRC;
 546         if (phystat0 & B43_RX_PHYST0_SHORTPRMBL)
 547                 status.flag |= RX_FLAG_SHORTPRE;
 548         if (macstat & B43_RX_MAC_DECERR) {
 549                 /* Decryption with the given key failed.
 550                  * Drop the packet. We also won't be able to decrypt it with
 551                  * the key in software. */
 552                 goto drop;
 553         }
 554
 555         /* Skip PLCP and padding */
 556         padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
 557         if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
 558                 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
 559                 goto drop;
 560         }
 561         plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
 562         skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
 563         /* The skb contains the Wireless Header + payload data now */
 564         if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
 565                 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
 566                 goto drop;
 567         }
 568         wlhdr = (struct ieee80211_hdr *)(skb->data);
 569         fctl = wlhdr->frame_control;
 570
 571         if (macstat & B43_RX_MAC_DEC) {
 572                 unsigned int keyidx;
 573                 int wlhdr_len;
 574
 575                 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
 576                           >> B43_RX_MAC_KEYIDX_SHIFT);
 577                 /* We must adjust the key index here. We want the "physical"
 578                  * key index, but the ucode passed it slightly different.
 579                  */
 580                 keyidx = b43_kidx_to_raw(dev, keyidx);
 581                 B43_WARN_ON(keyidx >= dev->max_nr_keys);
 582
 583                 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
 584                         wlhdr_len = ieee80211_hdrlen(fctl);
 585                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 586                                 b43dbg(dev->wl,
 587                                        "RX: Packet size underrun (3)\n");
 588                                 goto drop;
 589                         }
 590                         status.flag |= RX_FLAG_DECRYPTED;
 591                 }
 592         }
 593
 594         /* Link quality statistics */
 595         status.noise = dev->stats.link_noise;
 596         if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
 597 //              s8 rssi = max(rxhdr->power0, rxhdr->power1);
 598                 //TODO: Find out what the rssi value is (dBm or percentage?)
 599                 //      and also find out what the maximum possible value is.
 600                 //      Fill status.ssi and status.signal fields.
 601         } else {
 602                 status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
 603                                                   (phystat0 & B43_RX_PHYST0_OFDM),
 604                                                   (phystat0 & B43_RX_PHYST0_GAINCTL),
 605                                                   (phystat3 & B43_RX_PHYST3_TRSTATE));
 606                 status.qual = (rxhdr->jssi * 100) / B43_RX_MAX_SSI;
 607         }
 608
 609         if (phystat0 & B43_RX_PHYST0_OFDM)
 610                 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
 611                                                 phytype == B43_PHYTYPE_A);
 612         else
 613                 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
 614         if (unlikely(status.rate_idx == -1)) {
 615                 /* PLCP seems to be corrupted.
 616                  * Drop the frame, if we are not interested in corrupted frames. */
 617                 if (!(dev->wl->filter_flags & FIF_PLCPFAIL))
 618                         goto drop;
 619         }
 620         status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 621
 622         /*
 623          * All frames on monitor interfaces and beacons always need a full
 624          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 625          * purposes and beacons for IBSS merging.
 626          * This code assumes we get to process the packet within 16 bits
 627          * of timestamp, i.e. about 65 milliseconds after the PHY received
 628          * the first symbol.
 629          */
 630         if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
 631                 u16 low_mactime_now;
 632
 633                 b43_tsf_read(dev, &status.mactime);
 634                 low_mactime_now = status.mactime;
 635                 status.mactime = status.mactime & ~0xFFFFULL;
 636                 status.mactime += mactime;
 637                 if (low_mactime_now <= mactime)
 638                         status.mactime -= 0x10000;
 639                 status.flag |= RX_FLAG_TSFT;
 640         }
 641
 642         chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
 643         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 644         case B43_PHYTYPE_A:
 645                 status.band = IEEE80211_BAND_5GHZ;
 646                 B43_WARN_ON(1);
 647                 /* FIXME: We don't really know which value the "chanid" contains.
 648                  *        So the following assignment might be wrong. */
 649                 status.freq = b43_channel_to_freq_5ghz(chanid);
 650                 break;
 651         case B43_PHYTYPE_G:
 652                 status.band = IEEE80211_BAND_2GHZ;
 653                 /* chanid is the radio channel cookie value as used
 654                  * to tune the radio. */
 655                 status.freq = chanid + 2400;
 656                 break;
 657         case B43_PHYTYPE_N:
 658                 /* chanid is the SHM channel cookie. Which is the plain
 659                  * channel number in b43. */
 660                 if (chanstat & B43_RX_CHAN_5GHZ) {
 661                         status.band = IEEE80211_BAND_5GHZ;
 662                         status.freq = b43_freq_to_channel_5ghz(chanid);
 663                 } else {
 664                         status.band = IEEE80211_BAND_2GHZ;
 665                         status.freq = b43_freq_to_channel_2ghz(chanid);
 666                 }
 667                 break;
 668         default:
 669                 B43_WARN_ON(1);
 670                 goto drop;
 671         }
 672
 673         ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);
 674
 675         return;
 676 drop:
 677         b43dbg(dev->wl, "RX: Packet dropped\n");
 678         dev_kfree_skb_any(skb);
 679 }
 680
 681 void b43_handle_txstatus(struct b43_wldev *dev,
 682                          const struct b43_txstatus *status)
 683 {
 684         b43_debugfs_log_txstat(dev, status);
 685
 686         if (status->intermediate)
 687                 return;
 688         if (status->for_ampdu)
 689                 return;
 690         if (!status->acked)
 691                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 692         if (status->rts_count) {
 693                 if (status->rts_count == 0xF)   //FIXME
 694                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 695                 else
 696                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 697         }
 698
 699         if (b43_using_pio_transfers(dev))
 700                 b43_pio_handle_txstatus(dev, status);
 701         else
 702                 b43_dma_handle_txstatus(dev, status);
 703
 704         b43_phy_txpower_check(dev, 0);
 705 }
 706
 707 /* Fill out the mac80211 TXstatus report based on the b43-specific
 708  * txstatus report data. This returns a boolean whether the frame was
 709  * successfully transmitted. */
 710 bool b43_fill_txstatus_report(struct b43_wldev *dev,
 711                               struct ieee80211_tx_info *report,
 712                               const struct b43_txstatus *status)
 713 {
 714         bool frame_success = 1;
 715         int retry_limit;
 716
 717         /* preserve the confiured retry limit before clearing the status
 718          * The xmit function has overwritten the rc's value with the actual
 719          * retry limit done by the hardware */
 720         retry_limit = report->status.rates[0].count;
 721         ieee80211_tx_info_clear_status(report);
 722
 723         if (status->acked) {
 724                 /* The frame was ACKed. */
 725                 report->flags |= IEEE80211_TX_STAT_ACK;
 726         } else {
 727                 /* The frame was not ACKed... */
 728                 if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
 729                         /* ...but we expected an ACK. */
 730                         frame_success = 0;
 731                 }
 732         }
 733         if (status->frame_count == 0) {
 734                 /* The frame was not transmitted at all. */
 735                 report->status.rates[0].count = 0;
 736         } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
 737                 /*
 738                  * If the short retries (RTS, not data frame) have exceeded
 739                  * the limit, the hw will not have tried the selected rate,
 740                  * but will have used the fallback rate instead.
 741                  * Don't let the rate control count attempts for the selected
 742                  * rate in this case, otherwise the statistics will be off.
 743                  */
 744                 report->status.rates[0].count = 0;
 745                 report->status.rates[1].count = status->frame_count;
 746         } else {
 747                 if (status->frame_count > retry_limit) {
 748                         report->status.rates[0].count = retry_limit;
 749                         report->status.rates[1].count = status->frame_count -
 750                                         retry_limit;
 751
 752                 } else {
 753                         report->status.rates[0].count = status->frame_count;
 754                         report->status.rates[1].idx = -1;
 755                 }
 756         }
 757
 758         return frame_success;
 759 }
 760
 761 /* Stop any TX operation on the device (suspend the hardware queues) */
 762 void b43_tx_suspend(struct b43_wldev *dev)
 763 {
 764         if (b43_using_pio_transfers(dev))
 765                 b43_pio_tx_suspend(dev);
 766         else
 767                 b43_dma_tx_suspend(dev);
 768 }
 769
 770 /* Resume any TX operation on the device (resume the hardware queues) */
 771 void b43_tx_resume(struct b43_wldev *dev)
 772 {
 773         if (b43_using_pio_transfers(dev))
 774                 b43_pio_tx_resume(dev);
 775         else
 776                 b43_dma_tx_resume(dev);
 777 }