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                        struct sk_buff *skb_frag,
 184                        struct ieee80211_tx_info *info,
 185                        u16 cookie)
 186 {
 187         const unsigned char *fragment_data = skb_frag->data;
 188         unsigned int fragment_len = skb_frag->len;
 189         struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
 190         const struct b43_phy *phy = &dev->phy;
 191         const struct ieee80211_hdr *wlhdr =
 192             (const struct ieee80211_hdr *)fragment_data;
 193         int use_encryption = !!info->control.hw_key;
 194         __le16 fctl = wlhdr->frame_control;
 195         struct ieee80211_rate *fbrate;
 196         u8 rate, rate_fb;
 197         int rate_ofdm, rate_fb_ofdm;
 198         unsigned int plcp_fragment_len;
 199         u32 mac_ctl = 0;
 200         u16 phy_ctl = 0;
 201         u8 extra_ft = 0;
 202         struct ieee80211_rate *txrate;
 203         struct ieee80211_tx_rate *rates;
 204
 205         memset(txhdr, 0, sizeof(*txhdr));
 206
 207         txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
 208         rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
 209         rate_ofdm = b43_is_ofdm_rate(rate);
 210         fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
 211         rate_fb = fbrate->hw_value;
 212         rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
 213
 214         if (rate_ofdm)
 215                 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
 216         else
 217                 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
 218         txhdr->mac_frame_ctl = wlhdr->frame_control;
 219         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 220
 221         /* Calculate duration for fallback rate */
 222         if ((rate_fb == rate) ||
 223             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 224             (wlhdr->duration_id == cpu_to_le16(0))) {
 225                 /* If the fallback rate equals the normal rate or the
 226                  * dur_id field contains an AID, CFP magic or 0,
 227                  * use the original dur_id field. */
 228                 txhdr->dur_fb = wlhdr->duration_id;
 229         } else {
 230                 txhdr->dur_fb = ieee80211_generic_frame_duration(
 231                         dev->wl->hw, info->control.vif, fragment_len, fbrate);
 232         }
 233
 234         plcp_fragment_len = fragment_len + FCS_LEN;
 235         if (use_encryption) {
 236                 u8 key_idx = info->control.hw_key->hw_key_idx;
 237                 struct b43_key *key;
 238                 int wlhdr_len;
 239                 size_t iv_len;
 240
 241                 B43_WARN_ON(key_idx >= ARRAY_SIZE(dev->key));
 242                 key = &(dev->key[key_idx]);
 243
 244                 if (unlikely(!key->keyconf)) {
 245                         /* This key is invalid. This might only happen
 246                          * in a short timeframe after machine resume before
 247                          * we were able to reconfigure keys.
 248                          * Drop this packet completely. Do not transmit it
 249                          * unencrypted to avoid leaking information. */
 250                         return -ENOKEY;
 251                 }
 252
 253                 /* Hardware appends ICV. */
 254                 plcp_fragment_len += info->control.hw_key->icv_len;
 255
 256                 key_idx = b43_kidx_to_fw(dev, key_idx);
 257                 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
 258                            B43_TXH_MAC_KEYIDX;
 259                 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
 260                            B43_TXH_MAC_KEYALG;
 261                 wlhdr_len = ieee80211_hdrlen(fctl);
 262                 if (key->algorithm == B43_SEC_ALGO_TKIP) {
 263                         u16 phase1key[5];
 264                         int i;
 265                         /* we give the phase1key and iv16 here, the key is stored in
 266                          * shm. With that the hardware can do phase 2 and encryption.
 267                          */
 268                         ieee80211_get_tkip_key(info->control.hw_key, skb_frag,
 269                                         IEEE80211_TKIP_P1_KEY, (u8*)phase1key);
 270                         /* phase1key is in host endian. Copy to little-endian txhdr->iv. */
 271                         for (i = 0; i < 5; i++) {
 272                                 txhdr->iv[i * 2 + 0] = phase1key[i];
 273                                 txhdr->iv[i * 2 + 1] = phase1key[i] >> 8;
 274                         }
 275                         /* iv16 */
 276                         memcpy(txhdr->iv + 10, ((u8 *) wlhdr) + wlhdr_len, 3);
 277                 } else {
 278                         iv_len = min((size_t) info->control.hw_key->iv_len,
 279                                      ARRAY_SIZE(txhdr->iv));
 280                         memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
 281                 }
 282         }
 283         if (b43_is_old_txhdr_format(dev)) {
 284                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
 285                                       plcp_fragment_len, rate);
 286         } else {
 287                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
 288                                       plcp_fragment_len, rate);
 289         }
 290         b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
 291                               plcp_fragment_len, rate_fb);
 292
 293         /* Extra Frame Types */
 294         if (rate_fb_ofdm)
 295                 extra_ft |= B43_TXH_EFT_FB_OFDM;
 296         else
 297                 extra_ft |= B43_TXH_EFT_FB_CCK;
 298
 299         /* Set channel radio code. Note that the micrcode ORs 0x100 to
 300          * this value before comparing it to the value in SHM, if this
 301          * is a 5Ghz packet.
 302          */
 303         txhdr->chan_radio_code = phy->channel;
 304
 305         /* PHY TX Control word */
 306         if (rate_ofdm)
 307                 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
 308         else
 309                 phy_ctl |= B43_TXH_PHY_ENC_CCK;
 310         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 311                 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
 312
 313         switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
 314         case 0: /* Default */
 315                 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
 316                 break;
 317         case 1: /* Antenna 0 */
 318                 phy_ctl |= B43_TXH_PHY_ANT0;
 319                 break;
 320         case 2: /* Antenna 1 */
 321                 phy_ctl |= B43_TXH_PHY_ANT1;
 322                 break;
 323         case 3: /* Antenna 2 */
 324                 phy_ctl |= B43_TXH_PHY_ANT2;
 325                 break;
 326         case 4: /* Antenna 3 */
 327                 phy_ctl |= B43_TXH_PHY_ANT3;
 328                 break;
 329         default:
 330                 B43_WARN_ON(1);
 331         }
 332
 333         rates = info->control.rates;
 334         /* MAC control */
 335         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 336                 mac_ctl |= B43_TXH_MAC_ACK;
 337         /* use hardware sequence counter as the non-TID counter */
 338         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 339                 mac_ctl |= B43_TXH_MAC_HWSEQ;
 340         if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 341                 mac_ctl |= B43_TXH_MAC_STMSDU;
 342         if (phy->type == B43_PHYTYPE_A)
 343                 mac_ctl |= B43_TXH_MAC_5GHZ;
 344
 345         /* Overwrite rates[0].count to make the retry calculation
 346          * in the tx status easier. need the actual retry limit to
 347          * detect whether the fallback rate was used.
 348          */
 349         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 350             (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
 351                 rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
 352                 mac_ctl |= B43_TXH_MAC_LONGFRAME;
 353         } else {
 354                 rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
 355         }
 356
 357         /* Generate the RTS or CTS-to-self frame */
 358         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 359             (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
 360                 unsigned int len;
 361                 struct ieee80211_hdr *hdr;
 362                 int rts_rate, rts_rate_fb;
 363                 int rts_rate_ofdm, rts_rate_fb_ofdm;
 364                 struct b43_plcp_hdr6 *plcp;
 365                 struct ieee80211_rate *rts_cts_rate;
 366
 367                 rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);
 368
 369                 rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
 370                 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
 371                 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
 372                 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
 373
 374                 if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 375                         struct ieee80211_cts *cts;
 376
 377                         if (b43_is_old_txhdr_format(dev)) {
 378                                 cts = (struct ieee80211_cts *)
 379                                         (txhdr->old_format.rts_frame);
 380                         } else {
 381                                 cts = (struct ieee80211_cts *)
 382                                         (txhdr->new_format.rts_frame);
 383                         }
 384                         ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
 385                                                 fragment_data, fragment_len,
 386                                                 info, cts);
 387                         mac_ctl |= B43_TXH_MAC_SENDCTS;
 388                         len = sizeof(struct ieee80211_cts);
 389                 } else {
 390                         struct ieee80211_rts *rts;
 391
 392                         if (b43_is_old_txhdr_format(dev)) {
 393                                 rts = (struct ieee80211_rts *)
 394                                         (txhdr->old_format.rts_frame);
 395                         } else {
 396                                 rts = (struct ieee80211_rts *)
 397                                         (txhdr->new_format.rts_frame);
 398                         }
 399                         ieee80211_rts_get(dev->wl->hw, info->control.vif,
 400                                           fragment_data, fragment_len,
 401                                           info, rts);
 402                         mac_ctl |= B43_TXH_MAC_SENDRTS;
 403                         len = sizeof(struct ieee80211_rts);
 404                 }
 405                 len += FCS_LEN;
 406
 407                 /* Generate the PLCP headers for the RTS/CTS frame */
 408                 if (b43_is_old_txhdr_format(dev))
 409                         plcp = &txhdr->old_format.rts_plcp;
 410                 else
 411                         plcp = &txhdr->new_format.rts_plcp;
 412                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 413                                       len, rts_rate);
 414                 plcp = &txhdr->rts_plcp_fb;
 415                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 416                                       len, rts_rate_fb);
 417
 418                 if (b43_is_old_txhdr_format(dev)) {
 419                         hdr = (struct ieee80211_hdr *)
 420                                 (&txhdr->old_format.rts_frame);
 421                 } else {
 422                         hdr = (struct ieee80211_hdr *)
 423                                 (&txhdr->new_format.rts_frame);
 424                 }
 425                 txhdr->rts_dur_fb = hdr->duration_id;
 426
 427                 if (rts_rate_ofdm) {
 428                         extra_ft |= B43_TXH_EFT_RTS_OFDM;
 429                         txhdr->phy_rate_rts =
 430                             b43_plcp_get_ratecode_ofdm(rts_rate);
 431                 } else {
 432                         extra_ft |= B43_TXH_EFT_RTS_CCK;
 433                         txhdr->phy_rate_rts =
 434                             b43_plcp_get_ratecode_cck(rts_rate);
 435                 }
 436                 if (rts_rate_fb_ofdm)
 437                         extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
 438                 else
 439                         extra_ft |= B43_TXH_EFT_RTSFB_CCK;
 440         }
 441
 442         /* Magic cookie */
 443         if (b43_is_old_txhdr_format(dev))
 444                 txhdr->old_format.cookie = cpu_to_le16(cookie);
 445         else
 446                 txhdr->new_format.cookie = cpu_to_le16(cookie);
 447
 448         /* Apply the bitfields */
 449         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 450         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 451         txhdr->extra_ft = extra_ft;
 452
 453         return 0;
 454 }
 455
 456 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
 457                                u8 in_rssi, int ofdm,
 458                                int adjust_2053, int adjust_2050)
 459 {
 460         struct b43_phy *phy = &dev->phy;
 461         struct b43_phy_g *gphy = phy->g;
 462         s32 tmp;
 463
 464         switch (phy->radio_ver) {
 465         case 0x2050:
 466                 if (ofdm) {
 467                         tmp = in_rssi;
 468                         if (tmp > 127)
 469                                 tmp -= 256;
 470                         tmp *= 73;
 471                         tmp /= 64;
 472                         if (adjust_2050)
 473                                 tmp += 25;
 474                         else
 475                                 tmp -= 3;
 476                 } else {
 477                         if (dev->dev->bus->sprom.
 478                             boardflags_lo & B43_BFL_RSSI) {
 479                                 if (in_rssi > 63)
 480                                         in_rssi = 63;
 481                                 B43_WARN_ON(phy->type != B43_PHYTYPE_G);
 482                                 tmp = gphy->nrssi_lt[in_rssi];
 483                                 tmp = 31 - tmp;
 484                                 tmp *= -131;
 485                                 tmp /= 128;
 486                                 tmp -= 57;
 487                         } else {
 488                                 tmp = in_rssi;
 489                                 tmp = 31 - tmp;
 490                                 tmp *= -149;
 491                                 tmp /= 128;
 492                                 tmp -= 68;
 493                         }
 494                         if (phy->type == B43_PHYTYPE_G && adjust_2050)
 495                                 tmp += 25;
 496                 }
 497                 break;
 498         case 0x2060:
 499                 if (in_rssi > 127)
 500                         tmp = in_rssi - 256;
 501                 else
 502                         tmp = in_rssi;
 503                 break;
 504         default:
 505                 tmp = in_rssi;
 506                 tmp -= 11;
 507                 tmp *= 103;
 508                 tmp /= 64;
 509                 if (adjust_2053)
 510                         tmp -= 109;
 511                 else
 512                         tmp -= 83;
 513         }
 514
 515         return (s8) tmp;
 516 }
 517
 518 //TODO
 519 #if 0
 520 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
 521 {
 522         struct b43_phy *phy = &dev->phy;
 523         s8 ret;
 524
 525         if (phy->type == B43_PHYTYPE_A) {
 526                 //TODO: Incomplete specs.
 527                 ret = 0;
 528         } else
 529                 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
 530
 531         return ret;
 532 }
 533 #endif
 534
 535 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 536 {
 537         struct ieee80211_rx_status status;
 538         struct b43_plcp_hdr6 *plcp;
 539         struct ieee80211_hdr *wlhdr;
 540         const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
 541         __le16 fctl;
 542         u16 phystat0, phystat3, chanstat, mactime;
 543         u32 macstat;
 544         u16 chanid;
 545         u16 phytype;
 546         int padding;
 547
 548         memset(&status, 0, sizeof(status));
 549
 550         /* Get metadata about the frame from the header. */
 551         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 552         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 553         macstat = le32_to_cpu(rxhdr->mac_status);
 554         mactime = le16_to_cpu(rxhdr->mac_time);
 555         chanstat = le16_to_cpu(rxhdr->channel);
 556         phytype = chanstat & B43_RX_CHAN_PHYTYPE;
 557
 558         if (unlikely(macstat & B43_RX_MAC_FCSERR)) {
 559                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 560                 status.flag |= RX_FLAG_FAILED_FCS_CRC;
 561         }
 562         if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV)))
 563                 status.flag |= RX_FLAG_FAILED_PLCP_CRC;
 564         if (phystat0 & B43_RX_PHYST0_SHORTPRMBL)
 565                 status.flag |= RX_FLAG_SHORTPRE;
 566         if (macstat & B43_RX_MAC_DECERR) {
 567                 /* Decryption with the given key failed.
 568                  * Drop the packet. We also won't be able to decrypt it with
 569                  * the key in software. */
 570                 goto drop;
 571         }
 572
 573         /* Skip PLCP and padding */
 574         padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
 575         if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
 576                 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
 577                 goto drop;
 578         }
 579         plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
 580         skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
 581         /* The skb contains the Wireless Header + payload data now */
 582         if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
 583                 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
 584                 goto drop;
 585         }
 586         wlhdr = (struct ieee80211_hdr *)(skb->data);
 587         fctl = wlhdr->frame_control;
 588
 589         if (macstat & B43_RX_MAC_DEC) {
 590                 unsigned int keyidx;
 591                 int wlhdr_len;
 592
 593                 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
 594                           >> B43_RX_MAC_KEYIDX_SHIFT);
 595                 /* We must adjust the key index here. We want the "physical"
 596                  * key index, but the ucode passed it slightly different.
 597                  */
 598                 keyidx = b43_kidx_to_raw(dev, keyidx);
 599                 B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key));
 600
 601                 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
 602                         wlhdr_len = ieee80211_hdrlen(fctl);
 603                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 604                                 b43dbg(dev->wl,
 605                                        "RX: Packet size underrun (3)\n");
 606                                 goto drop;
 607                         }
 608                         status.flag |= RX_FLAG_DECRYPTED;
 609                 }
 610         }
 611
 612         /* Link quality statistics */
 613         if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
 614 //              s8 rssi = max(rxhdr->power0, rxhdr->power1);
 615                 //TODO: Find out what the rssi value is (dBm or percentage?)
 616                 //      and also find out what the maximum possible value is.
 617                 //      Fill status.ssi and status.signal fields.
 618         } else {
 619                 status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
 620                                                   (phystat0 & B43_RX_PHYST0_OFDM),
 621                                                   (phystat0 & B43_RX_PHYST0_GAINCTL),
 622                                                   (phystat3 & B43_RX_PHYST3_TRSTATE));
 623         }
 624
 625         if (phystat0 & B43_RX_PHYST0_OFDM)
 626                 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
 627                                                 phytype == B43_PHYTYPE_A);
 628         else
 629                 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
 630         if (unlikely(status.rate_idx == -1)) {
 631                 /* PLCP seems to be corrupted.
 632                  * Drop the frame, if we are not interested in corrupted frames. */
 633                 if (!(dev->wl->filter_flags & FIF_PLCPFAIL))
 634                         goto drop;
 635         }
 636         status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 637
 638         /*
 639          * All frames on monitor interfaces and beacons always need a full
 640          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 641          * purposes and beacons for IBSS merging.
 642          * This code assumes we get to process the packet within 16 bits
 643          * of timestamp, i.e. about 65 milliseconds after the PHY received
 644          * the first symbol.
 645          */
 646         if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
 647                 u16 low_mactime_now;
 648
 649                 b43_tsf_read(dev, &status.mactime);
 650                 low_mactime_now = status.mactime;
 651                 status.mactime = status.mactime & ~0xFFFFULL;
 652                 status.mactime += mactime;
 653                 if (low_mactime_now <= mactime)
 654                         status.mactime -= 0x10000;
 655                 status.flag |= RX_FLAG_TSFT;
 656         }
 657
 658         chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
 659         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 660         case B43_PHYTYPE_A:
 661                 status.band = IEEE80211_BAND_5GHZ;
 662                 B43_WARN_ON(1);
 663                 /* FIXME: We don't really know which value the "chanid" contains.
 664                  *        So the following assignment might be wrong. */
 665                 status.freq = b43_channel_to_freq_5ghz(chanid);
 666                 break;
 667         case B43_PHYTYPE_G:
 668                 status.band = IEEE80211_BAND_2GHZ;
 669                 /* chanid is the radio channel cookie value as used
 670                  * to tune the radio. */
 671                 status.freq = chanid + 2400;
 672                 break;
 673         case B43_PHYTYPE_N:
 674         case B43_PHYTYPE_LP:
 675                 /* chanid is the SHM channel cookie. Which is the plain
 676                  * channel number in b43. */
 677                 if (chanstat & B43_RX_CHAN_5GHZ) {
 678                         status.band = IEEE80211_BAND_5GHZ;
 679                         status.freq = b43_freq_to_channel_5ghz(chanid);
 680                 } else {
 681                         status.band = IEEE80211_BAND_2GHZ;
 682                         status.freq = b43_freq_to_channel_2ghz(chanid);
 683                 }
 684                 break;
 685         default:
 686                 B43_WARN_ON(1);
 687                 goto drop;
 688         }
 689
 690         memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
 691         ieee80211_rx_ni(dev->wl->hw, skb);
 692
 693 #if B43_DEBUG
 694         dev->rx_count++;
 695 #endif
 696         return;
 697 drop:
 698         b43dbg(dev->wl, "RX: Packet dropped\n");
 699         dev_kfree_skb_any(skb);
 700 }
 701
 702 void b43_handle_txstatus(struct b43_wldev *dev,
 703                          const struct b43_txstatus *status)
 704 {
 705         b43_debugfs_log_txstat(dev, status);
 706
 707         if (status->intermediate)
 708                 return;
 709         if (status->for_ampdu)
 710                 return;
 711         if (!status->acked)
 712                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 713         if (status->rts_count) {
 714                 if (status->rts_count == 0xF)   //FIXME
 715                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 716                 else
 717                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 718         }
 719
 720         if (b43_using_pio_transfers(dev))
 721                 b43_pio_handle_txstatus(dev, status);
 722         else
 723                 b43_dma_handle_txstatus(dev, status);
 724
 725         b43_phy_txpower_check(dev, 0);
 726 }
 727
 728 /* Fill out the mac80211 TXstatus report based on the b43-specific
 729  * txstatus report data. This returns a boolean whether the frame was
 730  * successfully transmitted. */
 731 bool b43_fill_txstatus_report(struct b43_wldev *dev,
 732                               struct ieee80211_tx_info *report,
 733                               const struct b43_txstatus *status)
 734 {
 735         bool frame_success = 1;
 736         int retry_limit;
 737
 738         /* preserve the confiured retry limit before clearing the status
 739          * The xmit function has overwritten the rc's value with the actual
 740          * retry limit done by the hardware */
 741         retry_limit = report->status.rates[0].count;
 742         ieee80211_tx_info_clear_status(report);
 743
 744         if (status->acked) {
 745                 /* The frame was ACKed. */
 746                 report->flags |= IEEE80211_TX_STAT_ACK;
 747         } else {
 748                 /* The frame was not ACKed... */
 749                 if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
 750                         /* ...but we expected an ACK. */
 751                         frame_success = 0;
 752                 }
 753         }
 754         if (status->frame_count == 0) {
 755                 /* The frame was not transmitted at all. */
 756                 report->status.rates[0].count = 0;
 757         } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
 758                 /*
 759                  * If the short retries (RTS, not data frame) have exceeded
 760                  * the limit, the hw will not have tried the selected rate,
 761                  * but will have used the fallback rate instead.
 762                  * Don't let the rate control count attempts for the selected
 763                  * rate in this case, otherwise the statistics will be off.
 764                  */
 765                 report->status.rates[0].count = 0;
 766                 report->status.rates[1].count = status->frame_count;
 767         } else {
 768                 if (status->frame_count > retry_limit) {
 769                         report->status.rates[0].count = retry_limit;
 770                         report->status.rates[1].count = status->frame_count -
 771                                         retry_limit;
 772
 773                 } else {
 774                         report->status.rates[0].count = status->frame_count;
 775                         report->status.rates[1].idx = -1;
 776                 }
 777         }
 778
 779         return frame_success;
 780 }
 781
 782 /* Stop any TX operation on the device (suspend the hardware queues) */
 783 void b43_tx_suspend(struct b43_wldev *dev)
 784 {
 785         if (b43_using_pio_transfers(dev))
 786                 b43_pio_tx_suspend(dev);
 787         else
 788                 b43_dma_tx_suspend(dev);
 789 }
 790
 791 /* Resume any TX operation on the device (resume the hardware queues) */
 792 void b43_tx_resume(struct b43_wldev *dev)
 793 {
 794         if (b43_using_pio_transfers(dev))
 795                 b43_pio_tx_resume(dev);
 796         else
 797                 b43_dma_tx_resume(dev);
 798 }