package/b43/src/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.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         B43_WARN_ON(1);
  50         return -1;
  51 }
  52
  53 /* Extract the bitrate index out of an OFDM PLCP header. */
  54 static u8 b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
  55 {
  56         int base = aphy ? 0 : 4;
  57
  58         switch (plcp->raw[0] & 0xF) {
  59         case 0xB:
  60                 return base + 0;
  61         case 0xF:
  62                 return base + 1;
  63         case 0xA:
  64                 return base + 2;
  65         case 0xE:
  66                 return base + 3;
  67         case 0x9:
  68                 return base + 4;
  69         case 0xD:
  70                 return base + 5;
  71         case 0x8:
  72                 return base + 6;
  73         case 0xC:
  74                 return base + 7;
  75         }
  76         B43_WARN_ON(1);
  77         return -1;
  78 }
  79
  80 u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
  81 {
  82         switch (bitrate) {
  83         case B43_CCK_RATE_1MB:
  84                 return 0x0A;
  85         case B43_CCK_RATE_2MB:
  86                 return 0x14;
  87         case B43_CCK_RATE_5MB:
  88                 return 0x37;
  89         case B43_CCK_RATE_11MB:
  90                 return 0x6E;
  91         }
  92         B43_WARN_ON(1);
  93         return 0;
  94 }
  95
  96 u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
  97 {
  98         switch (bitrate) {
  99         case B43_OFDM_RATE_6MB:
 100                 return 0xB;
 101         case B43_OFDM_RATE_9MB:
 102                 return 0xF;
 103         case B43_OFDM_RATE_12MB:
 104                 return 0xA;
 105         case B43_OFDM_RATE_18MB:
 106                 return 0xE;
 107         case B43_OFDM_RATE_24MB:
 108                 return 0x9;
 109         case B43_OFDM_RATE_36MB:
 110                 return 0xD;
 111         case B43_OFDM_RATE_48MB:
 112                 return 0x8;
 113         case B43_OFDM_RATE_54MB:
 114                 return 0xC;
 115         }
 116         B43_WARN_ON(1);
 117         return 0;
 118 }
 119
 120 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
 121                            const u16 octets, const u8 bitrate)
 122 {
 123         __le32 *data = &(plcp->data);
 124         __u8 *raw = plcp->raw;
 125
 126         if (b43_is_ofdm_rate(bitrate)) {
 127                 u32 d;
 128
 129                 d = b43_plcp_get_ratecode_ofdm(bitrate);
 130                 B43_WARN_ON(octets & 0xF000);
 131                 d |= (octets << 5);
 132                 *data = cpu_to_le32(d);
 133         } else {
 134                 u32 plen;
 135
 136                 plen = octets * 16 / bitrate;
 137                 if ((octets * 16 % bitrate) > 0) {
 138                         plen++;
 139                         if ((bitrate == B43_CCK_RATE_11MB)
 140                             && ((octets * 8 % 11) < 4)) {
 141                                 raw[1] = 0x84;
 142                         } else
 143                                 raw[1] = 0x04;
 144                 } else
 145                         raw[1] = 0x04;
 146                 *data |= cpu_to_le32(plen << 16);
 147                 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
 148         }
 149 }
 150
 151 static u8 b43_calc_fallback_rate(u8 bitrate)
 152 {
 153         switch (bitrate) {
 154         case B43_CCK_RATE_1MB:
 155                 return B43_CCK_RATE_1MB;
 156         case B43_CCK_RATE_2MB:
 157                 return B43_CCK_RATE_1MB;
 158         case B43_CCK_RATE_5MB:
 159                 return B43_CCK_RATE_2MB;
 160         case B43_CCK_RATE_11MB:
 161                 return B43_CCK_RATE_5MB;
 162         case B43_OFDM_RATE_6MB:
 163                 return B43_CCK_RATE_5MB;
 164         case B43_OFDM_RATE_9MB:
 165                 return B43_OFDM_RATE_6MB;
 166         case B43_OFDM_RATE_12MB:
 167                 return B43_OFDM_RATE_9MB;
 168         case B43_OFDM_RATE_18MB:
 169                 return B43_OFDM_RATE_12MB;
 170         case B43_OFDM_RATE_24MB:
 171                 return B43_OFDM_RATE_18MB;
 172         case B43_OFDM_RATE_36MB:
 173                 return B43_OFDM_RATE_24MB;
 174         case B43_OFDM_RATE_48MB:
 175                 return B43_OFDM_RATE_36MB;
 176         case B43_OFDM_RATE_54MB:
 177                 return B43_OFDM_RATE_48MB;
 178         }
 179         B43_WARN_ON(1);
 180         return 0;
 181 }
 182
 183 /* Generate a TX data header. */
 184 int b43_generate_txhdr(struct b43_wldev *dev,
 185                        u8 *_txhdr,
 186                        const unsigned char *fragment_data,
 187                        unsigned int fragment_len,
 188                        const struct ieee80211_tx_info *info,
 189                        u16 cookie)
 190 {
 191         struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
 192         const struct b43_phy *phy = &dev->phy;
 193         const struct ieee80211_hdr *wlhdr =
 194             (const struct ieee80211_hdr *)fragment_data;
 195         int use_encryption = (!(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT));
 196         u16 fctl = le16_to_cpu(wlhdr->frame_control);
 197         struct ieee80211_rate *fbrate;
 198         u8 rate, rate_fb;
 199         int rate_ofdm, rate_fb_ofdm;
 200         unsigned int plcp_fragment_len;
 201         u32 mac_ctl = 0;
 202         u16 phy_ctl = 0;
 203         u8 extra_ft = 0;
 204         struct ieee80211_rate *txrate;
 205
 206         memset(txhdr, 0, sizeof(*txhdr));
 207
 208         txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
 209         rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
 210         rate_ofdm = b43_is_ofdm_rate(rate);
 211         fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info) ? : txrate;
 212         rate_fb = fbrate->hw_value;
 213         rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
 214
 215         if (rate_ofdm)
 216                 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
 217         else
 218                 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
 219         txhdr->mac_frame_ctl = wlhdr->frame_control;
 220         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 221
 222         /* Calculate duration for fallback rate */
 223         if ((rate_fb == rate) ||
 224             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 225             (wlhdr->duration_id == cpu_to_le16(0))) {
 226                 /* If the fallback rate equals the normal rate or the
 227                  * dur_id field contains an AID, CFP magic or 0,
 228                  * use the original dur_id field. */
 229                 txhdr->dur_fb = wlhdr->duration_id;
 230         } else {
 231                 txhdr->dur_fb = ieee80211_generic_frame_duration(
 232                         dev->wl->hw, info->control.vif, fragment_len, fbrate);
 233         }
 234
 235         plcp_fragment_len = fragment_len + FCS_LEN;
 236         if (use_encryption) {
 237                 u8 key_idx = info->control.hw_key->hw_key_idx;
 238                 struct b43_key *key;
 239                 int wlhdr_len;
 240                 size_t iv_len;
 241
 242                 B43_WARN_ON(key_idx >= dev->max_nr_keys);
 243                 key = &(dev->key[key_idx]);
 244
 245                 if (unlikely(!key->keyconf)) {
 246                         /* This key is invalid. This might only happen
 247                          * in a short timeframe after machine resume before
 248                          * we were able to reconfigure keys.
 249                          * Drop this packet completely. Do not transmit it
 250                          * unencrypted to avoid leaking information. */
 251                         return -ENOKEY;
 252                 }
 253
 254                 /* Hardware appends ICV. */
 255                 plcp_fragment_len += info->control.icv_len;
 256
 257                 key_idx = b43_kidx_to_fw(dev, key_idx);
 258                 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
 259                            B43_TXH_MAC_KEYIDX;
 260                 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
 261                            B43_TXH_MAC_KEYALG;
 262                 wlhdr_len = ieee80211_get_hdrlen(fctl);
 263                 iv_len = min((size_t) info->control.iv_len,
 264                              ARRAY_SIZE(txhdr->iv));
 265                 memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
 266         }
 267         if (b43_is_old_txhdr_format(dev)) {
 268                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
 269                                       plcp_fragment_len, rate);
 270         } else {
 271                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
 272                                       plcp_fragment_len, rate);
 273         }
 274         b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
 275                               plcp_fragment_len, rate_fb);
 276
 277         /* Extra Frame Types */
 278         if (rate_fb_ofdm)
 279                 extra_ft |= B43_TXH_EFT_FB_OFDM;
 280         else
 281                 extra_ft |= B43_TXH_EFT_FB_CCK;
 282
 283         /* Set channel radio code. Note that the micrcode ORs 0x100 to
 284          * this value before comparing it to the value in SHM, if this
 285          * is a 5Ghz packet.
 286          */
 287         txhdr->chan_radio_code = phy->channel;
 288
 289         /* PHY TX Control word */
 290         if (rate_ofdm)
 291                 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
 292         else
 293                 phy_ctl |= B43_TXH_PHY_ENC_CCK;
 294         if (info->flags & IEEE80211_TX_CTL_SHORT_PREAMBLE)
 295                 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
 296
 297         switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
 298         case 0: /* Default */
 299                 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
 300                 break;
 301         case 1: /* Antenna 0 */
 302                 phy_ctl |= B43_TXH_PHY_ANT0;
 303                 break;
 304         case 2: /* Antenna 1 */
 305                 phy_ctl |= B43_TXH_PHY_ANT1;
 306                 break;
 307         case 3: /* Antenna 2 */
 308                 phy_ctl |= B43_TXH_PHY_ANT2;
 309                 break;
 310         case 4: /* Antenna 3 */
 311                 phy_ctl |= B43_TXH_PHY_ANT3;
 312                 break;
 313         default:
 314                 B43_WARN_ON(1);
 315         }
 316
 317         /* MAC control */
 318         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 319                 mac_ctl |= B43_TXH_MAC_ACK;
 320         if (!(((fctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
 321               ((fctl & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)))
 322                 mac_ctl |= B43_TXH_MAC_HWSEQ;
 323         if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 324                 mac_ctl |= B43_TXH_MAC_STMSDU;
 325         if (phy->type == B43_PHYTYPE_A)
 326                 mac_ctl |= B43_TXH_MAC_5GHZ;
 327         if (info->flags & IEEE80211_TX_CTL_LONG_RETRY_LIMIT)
 328                 mac_ctl |= B43_TXH_MAC_LONGFRAME;
 329
 330         /* Generate the RTS or CTS-to-self frame */
 331         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
 332             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) {
 333                 unsigned int len;
 334                 struct ieee80211_hdr *hdr;
 335                 int rts_rate, rts_rate_fb;
 336                 int rts_rate_ofdm, rts_rate_fb_ofdm;
 337                 struct b43_plcp_hdr6 *plcp;
 338                 struct ieee80211_rate *rts_cts_rate;
 339
 340                 rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);
 341
 342                 rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
 343                 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
 344                 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
 345                 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
 346
 347                 if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) {
 348                         struct ieee80211_cts *cts;
 349
 350                         if (b43_is_old_txhdr_format(dev)) {
 351                                 cts = (struct ieee80211_cts *)
 352                                         (txhdr->old_format.rts_frame);
 353                         } else {
 354                                 cts = (struct ieee80211_cts *)
 355                                         (txhdr->new_format.rts_frame);
 356                         }
 357                         ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
 358                                                 fragment_data, fragment_len,
 359                                                 info, cts);
 360                         mac_ctl |= B43_TXH_MAC_SENDCTS;
 361                         len = sizeof(struct ieee80211_cts);
 362                 } else {
 363                         struct ieee80211_rts *rts;
 364
 365                         if (b43_is_old_txhdr_format(dev)) {
 366                                 rts = (struct ieee80211_rts *)
 367                                         (txhdr->old_format.rts_frame);
 368                         } else {
 369                                 rts = (struct ieee80211_rts *)
 370                                         (txhdr->new_format.rts_frame);
 371                         }
 372                         ieee80211_rts_get(dev->wl->hw, info->control.vif,
 373                                           fragment_data, fragment_len,
 374                                           info, rts);
 375                         mac_ctl |= B43_TXH_MAC_SENDRTS;
 376                         len = sizeof(struct ieee80211_rts);
 377                 }
 378                 len += FCS_LEN;
 379
 380                 /* Generate the PLCP headers for the RTS/CTS frame */
 381                 if (b43_is_old_txhdr_format(dev))
 382                         plcp = &txhdr->old_format.rts_plcp;
 383                 else
 384                         plcp = &txhdr->new_format.rts_plcp;
 385                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 386                                       len, rts_rate);
 387                 plcp = &txhdr->rts_plcp_fb;
 388                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 389                                       len, rts_rate_fb);
 390
 391                 if (b43_is_old_txhdr_format(dev)) {
 392                         hdr = (struct ieee80211_hdr *)
 393                                 (&txhdr->old_format.rts_frame);
 394                 } else {
 395                         hdr = (struct ieee80211_hdr *)
 396                                 (&txhdr->new_format.rts_frame);
 397                 }
 398                 txhdr->rts_dur_fb = hdr->duration_id;
 399
 400                 if (rts_rate_ofdm) {
 401                         extra_ft |= B43_TXH_EFT_RTS_OFDM;
 402                         txhdr->phy_rate_rts =
 403                             b43_plcp_get_ratecode_ofdm(rts_rate);
 404                 } else {
 405                         extra_ft |= B43_TXH_EFT_RTS_CCK;
 406                         txhdr->phy_rate_rts =
 407                             b43_plcp_get_ratecode_cck(rts_rate);
 408                 }
 409                 if (rts_rate_fb_ofdm)
 410                         extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
 411                 else
 412                         extra_ft |= B43_TXH_EFT_RTSFB_CCK;
 413         }
 414
 415         /* Magic cookie */
 416         if (b43_is_old_txhdr_format(dev))
 417                 txhdr->old_format.cookie = cpu_to_le16(cookie);
 418         else
 419                 txhdr->new_format.cookie = cpu_to_le16(cookie);
 420
 421         /* Apply the bitfields */
 422         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 423         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 424         txhdr->extra_ft = extra_ft;
 425
 426         return 0;
 427 }
 428
 429 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
 430                                u8 in_rssi, int ofdm,
 431                                int adjust_2053, int adjust_2050)
 432 {
 433         struct b43_phy *phy = &dev->phy;
 434         s32 tmp;
 435
 436         switch (phy->radio_ver) {
 437         case 0x2050:
 438                 if (ofdm) {
 439                         tmp = in_rssi;
 440                         if (tmp > 127)
 441                                 tmp -= 256;
 442                         tmp *= 73;
 443                         tmp /= 64;
 444                         if (adjust_2050)
 445                                 tmp += 25;
 446                         else
 447                                 tmp -= 3;
 448                 } else {
 449                         if (dev->dev->bus->sprom.
 450                             boardflags_lo & B43_BFL_RSSI) {
 451                                 if (in_rssi > 63)
 452                                         in_rssi = 63;
 453                                 tmp = phy->nrssi_lt[in_rssi];
 454                                 tmp = 31 - tmp;
 455                                 tmp *= -131;
 456                                 tmp /= 128;
 457                                 tmp -= 57;
 458                         } else {
 459                                 tmp = in_rssi;
 460                                 tmp = 31 - tmp;
 461                                 tmp *= -149;
 462                                 tmp /= 128;
 463                                 tmp -= 68;
 464                         }
 465                         if (phy->type == B43_PHYTYPE_G && adjust_2050)
 466                                 tmp += 25;
 467                 }
 468                 break;
 469         case 0x2060:
 470                 if (in_rssi > 127)
 471                         tmp = in_rssi - 256;
 472                 else
 473                         tmp = in_rssi;
 474                 break;
 475         default:
 476                 tmp = in_rssi;
 477                 tmp -= 11;
 478                 tmp *= 103;
 479                 tmp /= 64;
 480                 if (adjust_2053)
 481                         tmp -= 109;
 482                 else
 483                         tmp -= 83;
 484         }
 485
 486         return (s8) tmp;
 487 }
 488
 489 //TODO
 490 #if 0
 491 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
 492 {
 493         struct b43_phy *phy = &dev->phy;
 494         s8 ret;
 495
 496         if (phy->type == B43_PHYTYPE_A) {
 497                 //TODO: Incomplete specs.
 498                 ret = 0;
 499         } else
 500                 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
 501
 502         return ret;
 503 }
 504 #endif
 505
 506 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 507 {
 508         struct ieee80211_rx_status status;
 509         struct b43_plcp_hdr6 *plcp;
 510         struct ieee80211_hdr *wlhdr;
 511         const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
 512         u16 fctl;
 513         u16 phystat0, phystat3, chanstat, mactime;
 514         u32 macstat;
 515         u16 chanid;
 516         u16 phytype;
 517         int padding;
 518
 519         memset(&status, 0, sizeof(status));
 520
 521         /* Get metadata about the frame from the header. */
 522         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 523         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 524         macstat = le32_to_cpu(rxhdr->mac_status);
 525         mactime = le16_to_cpu(rxhdr->mac_time);
 526         chanstat = le16_to_cpu(rxhdr->channel);
 527         phytype = chanstat & B43_RX_CHAN_PHYTYPE;
 528
 529         if (macstat & B43_RX_MAC_FCSERR)
 530                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 531         if (macstat & B43_RX_MAC_DECERR) {
 532                 /* Decryption with the given key failed.
 533                  * Drop the packet. We also won't be able to decrypt it with
 534                  * the key in software. */
 535                 goto drop;
 536         }
 537
 538         /* Skip PLCP and padding */
 539         padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
 540         if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
 541                 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
 542                 goto drop;
 543         }
 544         plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
 545         skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
 546         /* The skb contains the Wireless Header + payload data now */
 547         if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
 548                 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
 549                 goto drop;
 550         }
 551         wlhdr = (struct ieee80211_hdr *)(skb->data);
 552         fctl = le16_to_cpu(wlhdr->frame_control);
 553
 554         if (macstat & B43_RX_MAC_DEC) {
 555                 unsigned int keyidx;
 556                 int wlhdr_len;
 557
 558                 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
 559                           >> B43_RX_MAC_KEYIDX_SHIFT);
 560                 /* We must adjust the key index here. We want the "physical"
 561                  * key index, but the ucode passed it slightly different.
 562                  */
 563                 keyidx = b43_kidx_to_raw(dev, keyidx);
 564                 B43_WARN_ON(keyidx >= dev->max_nr_keys);
 565
 566                 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
 567                         wlhdr_len = ieee80211_get_hdrlen(fctl);
 568                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 569                                 b43dbg(dev->wl,
 570                                        "RX: Packet size underrun (3)\n");
 571                                 goto drop;
 572                         }
 573                         status.flag |= RX_FLAG_DECRYPTED;
 574                 }
 575         }
 576
 577         /* Link quality statistics */
 578         status.noise = dev->stats.link_noise;
 579         if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
 580 //              s8 rssi = max(rxhdr->power0, rxhdr->power1);
 581                 //TODO: Find out what the rssi value is (dBm or percentage?)
 582                 //      and also find out what the maximum possible value is.
 583                 //      Fill status.ssi and status.signal fields.
 584         } else {
 585                 status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
 586                                                   (phystat0 & B43_RX_PHYST0_OFDM),
 587                                                   (phystat0 & B43_RX_PHYST0_GAINCTL),
 588                                                   (phystat3 & B43_RX_PHYST3_TRSTATE));
 589                 status.qual = (rxhdr->jssi * 100) / B43_RX_MAX_SSI;
 590         }
 591
 592         if (phystat0 & B43_RX_PHYST0_OFDM)
 593                 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
 594                                                 phytype == B43_PHYTYPE_A);
 595         else
 596                 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
 597         status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 598
 599         /*
 600          * All frames on monitor interfaces and beacons always need a full
 601          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 602          * purposes and beacons for IBSS merging.
 603          * This code assumes we get to process the packet within 16 bits
 604          * of timestamp, i.e. about 65 milliseconds after the PHY received
 605          * the first symbol.
 606          */
 607         if (((fctl & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
 608             == (IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON)) ||
 609             dev->wl->radiotap_enabled) {
 610                 u16 low_mactime_now;
 611
 612                 b43_tsf_read(dev, &status.mactime);
 613                 low_mactime_now = status.mactime;
 614                 status.mactime = status.mactime & ~0xFFFFULL;
 615                 status.mactime += mactime;
 616                 if (low_mactime_now <= mactime)
 617                         status.mactime -= 0x10000;
 618                 status.flag |= RX_FLAG_TSFT;
 619         }
 620
 621         chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
 622         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 623         case B43_PHYTYPE_A:
 624                 status.band = IEEE80211_BAND_5GHZ;
 625                 B43_WARN_ON(1);
 626                 /* FIXME: We don't really know which value the "chanid" contains.
 627                  *        So the following assignment might be wrong. */
 628                 status.freq = b43_channel_to_freq_5ghz(chanid);
 629                 break;
 630         case B43_PHYTYPE_G:
 631                 status.band = IEEE80211_BAND_2GHZ;
 632                 /* chanid is the radio channel cookie value as used
 633                  * to tune the radio. */
 634                 status.freq = chanid + 2400;
 635                 break;
 636         case B43_PHYTYPE_N:
 637                 /* chanid is the SHM channel cookie. Which is the plain
 638                  * channel number in b43. */
 639                 if (chanstat & B43_RX_CHAN_5GHZ) {
 640                         status.band = IEEE80211_BAND_5GHZ;
 641                         status.freq = b43_freq_to_channel_5ghz(chanid);
 642                 } else {
 643                         status.band = IEEE80211_BAND_2GHZ;
 644                         status.freq = b43_freq_to_channel_2ghz(chanid);
 645                 }
 646                 break;
 647         default:
 648                 B43_WARN_ON(1);
 649                 goto drop;
 650         }
 651
 652         dev->stats.last_rx = jiffies;
 653         ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);
 654
 655         return;
 656 drop:
 657         b43dbg(dev->wl, "RX: Packet dropped\n");
 658         dev_kfree_skb_any(skb);
 659 }
 660
 661 void b43_handle_txstatus(struct b43_wldev *dev,
 662                          const struct b43_txstatus *status)
 663 {
 664         b43_debugfs_log_txstat(dev, status);
 665
 666         if (status->intermediate)
 667                 return;
 668         if (status->for_ampdu)
 669                 return;
 670         if (!status->acked)
 671                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 672         if (status->rts_count) {
 673                 if (status->rts_count == 0xF)   //FIXME
 674                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 675                 else
 676                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 677         }
 678
 679         if (b43_using_pio_transfers(dev))
 680                 b43_pio_handle_txstatus(dev, status);
 681         else
 682                 b43_dma_handle_txstatus(dev, status);
 683 }
 684
 685 /* Fill out the mac80211 TXstatus report based on the b43-specific
 686  * txstatus report data. This returns a boolean whether the frame was
 687  * successfully transmitted. */
 688 bool b43_fill_txstatus_report(struct ieee80211_tx_info *report,
 689                               const struct b43_txstatus *status)
 690 {
 691         bool frame_success = 1;
 692
 693         if (status->acked) {
 694                 /* The frame was ACKed. */
 695                 report->flags |= IEEE80211_TX_STAT_ACK;
 696         } else {
 697                 /* The frame was not ACKed... */
 698                 if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
 699                         /* ...but we expected an ACK. */
 700                         frame_success = 0;
 701                         report->status.excessive_retries = 1;
 702                 }
 703         }
 704         if (status->frame_count == 0) {
 705                 /* The frame was not transmitted at all. */
 706                 report->status.retry_count = 0;
 707         } else
 708                 report->status.retry_count = status->frame_count - 1;
 709
 710         return frame_success;
 711 }
 712
 713 /* Stop any TX operation on the device (suspend the hardware queues) */
 714 void b43_tx_suspend(struct b43_wldev *dev)
 715 {
 716         if (b43_using_pio_transfers(dev))
 717                 b43_pio_tx_suspend(dev);
 718         else
 719                 b43_dma_tx_suspend(dev);
 720 }
 721
 722 /* Resume any TX operation on the device (resume the hardware queues) */
 723 void b43_tx_resume(struct b43_wldev *dev)
 724 {
 725         if (b43_using_pio_transfers(dev))
 726                 b43_pio_tx_resume(dev);
 727         else
 728                 b43_dma_tx_resume(dev);
 729 }