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 <m@bues.ch>
  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 static const struct b43_tx_legacy_rate_phy_ctl_entry b43_tx_legacy_rate_phy_ctl[] = {
  36         { B43_CCK_RATE_1MB,     0x0,                    0x0 },
  37         { B43_CCK_RATE_2MB,     0x0,                    0x1 },
  38         { B43_CCK_RATE_5MB,     0x0,                    0x2 },
  39         { B43_CCK_RATE_11MB,    0x0,                    0x3 },
  40         { B43_OFDM_RATE_6MB,    B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_BPSK },
  41         { B43_OFDM_RATE_9MB,    B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_BPSK },
  42         { B43_OFDM_RATE_12MB,   B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QPSK },
  43         { B43_OFDM_RATE_18MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QPSK },
  44         { B43_OFDM_RATE_24MB,   B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QAM16 },
  45         { B43_OFDM_RATE_36MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM16 },
  46         { B43_OFDM_RATE_48MB,   B43_TXH_PHY1_CRATE_2_3, B43_TXH_PHY1_MODUL_QAM64 },
  47         { B43_OFDM_RATE_54MB,   B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM64 },
  48 };
  49
  50 static const struct b43_tx_legacy_rate_phy_ctl_entry *
  51 b43_tx_legacy_rate_phy_ctl_ent(u8 bitrate)
  52 {
  53         const struct b43_tx_legacy_rate_phy_ctl_entry *e;
  54         unsigned int i;
  55
  56         for (i = 0; i < ARRAY_SIZE(b43_tx_legacy_rate_phy_ctl); i++) {
  57                 e = &(b43_tx_legacy_rate_phy_ctl[i]);
  58                 if (e->bitrate == bitrate)
  59                         return e;
  60         }
  61
  62         B43_WARN_ON(1);
  63         return NULL;
  64 }
  65
  66 /* Extract the bitrate index out of a CCK PLCP header. */
  67 static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
  68 {
  69         switch (plcp->raw[0]) {
  70         case 0x0A:
  71                 return 0;
  72         case 0x14:
  73                 return 1;
  74         case 0x37:
  75                 return 2;
  76         case 0x6E:
  77                 return 3;
  78         }
  79         return -1;
  80 }
  81
  82 /* Extract the bitrate index out of an OFDM PLCP header. */
  83 static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
  84 {
  85         int base = aphy ? 0 : 4;
  86
  87         switch (plcp->raw[0] & 0xF) {
  88         case 0xB:
  89                 return base + 0;
  90         case 0xF:
  91                 return base + 1;
  92         case 0xA:
  93                 return base + 2;
  94         case 0xE:
  95                 return base + 3;
  96         case 0x9:
  97                 return base + 4;
  98         case 0xD:
  99                 return base + 5;
 100         case 0x8:
 101                 return base + 6;
 102         case 0xC:
 103                 return base + 7;
 104         }
 105         return -1;
 106 }
 107
 108 u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
 109 {
 110         switch (bitrate) {
 111         case B43_CCK_RATE_1MB:
 112                 return 0x0A;
 113         case B43_CCK_RATE_2MB:
 114                 return 0x14;
 115         case B43_CCK_RATE_5MB:
 116                 return 0x37;
 117         case B43_CCK_RATE_11MB:
 118                 return 0x6E;
 119         }
 120         B43_WARN_ON(1);
 121         return 0;
 122 }
 123
 124 u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
 125 {
 126         switch (bitrate) {
 127         case B43_OFDM_RATE_6MB:
 128                 return 0xB;
 129         case B43_OFDM_RATE_9MB:
 130                 return 0xF;
 131         case B43_OFDM_RATE_12MB:
 132                 return 0xA;
 133         case B43_OFDM_RATE_18MB:
 134                 return 0xE;
 135         case B43_OFDM_RATE_24MB:
 136                 return 0x9;
 137         case B43_OFDM_RATE_36MB:
 138                 return 0xD;
 139         case B43_OFDM_RATE_48MB:
 140                 return 0x8;
 141         case B43_OFDM_RATE_54MB:
 142                 return 0xC;
 143         }
 144         B43_WARN_ON(1);
 145         return 0;
 146 }
 147
 148 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
 149                            const u16 octets, const u8 bitrate)
 150 {
 151         __u8 *raw = plcp->raw;
 152
 153         if (b43_is_ofdm_rate(bitrate)) {
 154                 u32 d;
 155
 156                 d = b43_plcp_get_ratecode_ofdm(bitrate);
 157                 B43_WARN_ON(octets & 0xF000);
 158                 d |= (octets << 5);
 159                 plcp->data = cpu_to_le32(d);
 160         } else {
 161                 u32 plen;
 162
 163                 plen = octets * 16 / bitrate;
 164                 if ((octets * 16 % bitrate) > 0) {
 165                         plen++;
 166                         if ((bitrate == B43_CCK_RATE_11MB)
 167                             && ((octets * 8 % 11) < 4)) {
 168                                 raw[1] = 0x84;
 169                         } else
 170                                 raw[1] = 0x04;
 171                 } else
 172                         raw[1] = 0x04;
 173                 plcp->data |= cpu_to_le32(plen << 16);
 174                 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
 175         }
 176 }
 177
 178 static u16 b43_generate_tx_phy_ctl1(struct b43_wldev *dev, u8 bitrate)
 179 {
 180         const struct b43_phy *phy = &dev->phy;
 181         const struct b43_tx_legacy_rate_phy_ctl_entry *e;
 182         u16 control = 0;
 183         u16 bw;
 184
 185         if (phy->type == B43_PHYTYPE_LP)
 186                 bw = B43_TXH_PHY1_BW_20;
 187         else /* FIXME */
 188                 bw = B43_TXH_PHY1_BW_20;
 189
 190         if (0) { /* FIXME: MIMO */
 191         } else if (b43_is_cck_rate(bitrate) && phy->type != B43_PHYTYPE_LP) {
 192                 control = bw;
 193         } else {
 194                 control = bw;
 195                 e = b43_tx_legacy_rate_phy_ctl_ent(bitrate);
 196                 if (e) {
 197                         control |= e->coding_rate;
 198                         control |= e->modulation;
 199                 }
 200                 control |= B43_TXH_PHY1_MODE_SISO;
 201         }
 202
 203         return control;
 204 }
 205
 206 static u8 b43_calc_fallback_rate(u8 bitrate)
 207 {
 208         switch (bitrate) {
 209         case B43_CCK_RATE_1MB:
 210                 return B43_CCK_RATE_1MB;
 211         case B43_CCK_RATE_2MB:
 212                 return B43_CCK_RATE_1MB;
 213         case B43_CCK_RATE_5MB:
 214                 return B43_CCK_RATE_2MB;
 215         case B43_CCK_RATE_11MB:
 216                 return B43_CCK_RATE_5MB;
 217         case B43_OFDM_RATE_6MB:
 218                 return B43_CCK_RATE_5MB;
 219         case B43_OFDM_RATE_9MB:
 220                 return B43_OFDM_RATE_6MB;
 221         case B43_OFDM_RATE_12MB:
 222                 return B43_OFDM_RATE_9MB;
 223         case B43_OFDM_RATE_18MB:
 224                 return B43_OFDM_RATE_12MB;
 225         case B43_OFDM_RATE_24MB:
 226                 return B43_OFDM_RATE_18MB;
 227         case B43_OFDM_RATE_36MB:
 228                 return B43_OFDM_RATE_24MB;
 229         case B43_OFDM_RATE_48MB:
 230                 return B43_OFDM_RATE_36MB;
 231         case B43_OFDM_RATE_54MB:
 232                 return B43_OFDM_RATE_48MB;
 233         }
 234         B43_WARN_ON(1);
 235         return 0;
 236 }
 237
 238 /* Generate a TX data header. */
 239 int b43_generate_txhdr(struct b43_wldev *dev,
 240                        u8 *_txhdr,
 241                        struct sk_buff *skb_frag,
 242                        struct ieee80211_tx_info *info,
 243                        u16 cookie)
 244 {
 245         const unsigned char *fragment_data = skb_frag->data;
 246         unsigned int fragment_len = skb_frag->len;
 247         struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
 248         const struct b43_phy *phy = &dev->phy;
 249         const struct ieee80211_hdr *wlhdr =
 250             (const struct ieee80211_hdr *)fragment_data;
 251         int use_encryption = !!info->control.hw_key;
 252         __le16 fctl = wlhdr->frame_control;
 253         struct ieee80211_rate *fbrate;
 254         u8 rate, rate_fb;
 255         int rate_ofdm, rate_fb_ofdm;
 256         unsigned int plcp_fragment_len;
 257         u32 mac_ctl = 0;
 258         u16 phy_ctl = 0;
 259         u8 extra_ft = 0;
 260         struct ieee80211_rate *txrate;
 261         struct ieee80211_tx_rate *rates;
 262
 263         memset(txhdr, 0, sizeof(*txhdr));
 264
 265         txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
 266         rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
 267         rate_ofdm = b43_is_ofdm_rate(rate);
 268         fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
 269         rate_fb = fbrate->hw_value;
 270         rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
 271
 272         if (rate_ofdm)
 273                 txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
 274         else
 275                 txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
 276         txhdr->mac_frame_ctl = wlhdr->frame_control;
 277         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 278
 279         /* Calculate duration for fallback rate */
 280         if ((rate_fb == rate) ||
 281             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 282             (wlhdr->duration_id == cpu_to_le16(0))) {
 283                 /* If the fallback rate equals the normal rate or the
 284                  * dur_id field contains an AID, CFP magic or 0,
 285                  * use the original dur_id field. */
 286                 txhdr->dur_fb = wlhdr->duration_id;
 287         } else {
 288                 txhdr->dur_fb = ieee80211_generic_frame_duration(
 289                         dev->wl->hw, info->control.vif, fragment_len, fbrate);
 290         }
 291
 292         plcp_fragment_len = fragment_len + FCS_LEN;
 293         if (use_encryption) {
 294                 u8 key_idx = info->control.hw_key->hw_key_idx;
 295                 struct b43_key *key;
 296                 int wlhdr_len;
 297                 size_t iv_len;
 298
 299                 B43_WARN_ON(key_idx >= ARRAY_SIZE(dev->key));
 300                 key = &(dev->key[key_idx]);
 301
 302                 if (unlikely(!key->keyconf)) {
 303                         /* This key is invalid. This might only happen
 304                          * in a short timeframe after machine resume before
 305                          * we were able to reconfigure keys.
 306                          * Drop this packet completely. Do not transmit it
 307                          * unencrypted to avoid leaking information. */
 308                         return -ENOKEY;
 309                 }
 310
 311                 /* Hardware appends ICV. */
 312                 plcp_fragment_len += info->control.hw_key->icv_len;
 313
 314                 key_idx = b43_kidx_to_fw(dev, key_idx);
 315                 mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
 316                            B43_TXH_MAC_KEYIDX;
 317                 mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
 318                            B43_TXH_MAC_KEYALG;
 319                 wlhdr_len = ieee80211_hdrlen(fctl);
 320                 if (key->algorithm == B43_SEC_ALGO_TKIP) {
 321                         u16 phase1key[5];
 322                         int i;
 323                         /* we give the phase1key and iv16 here, the key is stored in
 324                          * shm. With that the hardware can do phase 2 and encryption.
 325                          */
 326                         ieee80211_get_tkip_p1k(info->control.hw_key, skb_frag, phase1key);
 327                         /* phase1key is in host endian. Copy to little-endian txhdr->iv. */
 328                         for (i = 0; i < 5; i++) {
 329                                 txhdr->iv[i * 2 + 0] = phase1key[i];
 330                                 txhdr->iv[i * 2 + 1] = phase1key[i] >> 8;
 331                         }
 332                         /* iv16 */
 333                         memcpy(txhdr->iv + 10, ((u8 *) wlhdr) + wlhdr_len, 3);
 334                 } else {
 335                         iv_len = min((size_t) info->control.hw_key->iv_len,
 336                                      ARRAY_SIZE(txhdr->iv));
 337                         memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
 338                 }
 339         }
 340         switch (dev->fw.hdr_format) {
 341         case B43_FW_HDR_598:
 342                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_598.plcp),
 343                                       plcp_fragment_len, rate);
 344                 break;
 345         case B43_FW_HDR_351:
 346                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_351.plcp),
 347                                       plcp_fragment_len, rate);
 348                 break;
 349         case B43_FW_HDR_410:
 350                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_410.plcp),
 351                                       plcp_fragment_len, rate);
 352                 break;
 353         }
 354         b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
 355                               plcp_fragment_len, rate_fb);
 356
 357         /* Extra Frame Types */
 358         if (rate_fb_ofdm)
 359                 extra_ft |= B43_TXH_EFT_FB_OFDM;
 360         else
 361                 extra_ft |= B43_TXH_EFT_FB_CCK;
 362
 363         /* Set channel radio code. Note that the micrcode ORs 0x100 to
 364          * this value before comparing it to the value in SHM, if this
 365          * is a 5Ghz packet.
 366          */
 367         txhdr->chan_radio_code = phy->channel;
 368
 369         /* PHY TX Control word */
 370         if (rate_ofdm)
 371                 phy_ctl |= B43_TXH_PHY_ENC_OFDM;
 372         else
 373                 phy_ctl |= B43_TXH_PHY_ENC_CCK;
 374         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 375                 phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
 376
 377         switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
 378         case 0: /* Default */
 379                 phy_ctl |= B43_TXH_PHY_ANT01AUTO;
 380                 break;
 381         case 1: /* Antenna 0 */
 382                 phy_ctl |= B43_TXH_PHY_ANT0;
 383                 break;
 384         case 2: /* Antenna 1 */
 385                 phy_ctl |= B43_TXH_PHY_ANT1;
 386                 break;
 387         case 3: /* Antenna 2 */
 388                 phy_ctl |= B43_TXH_PHY_ANT2;
 389                 break;
 390         case 4: /* Antenna 3 */
 391                 phy_ctl |= B43_TXH_PHY_ANT3;
 392                 break;
 393         default:
 394                 B43_WARN_ON(1);
 395         }
 396
 397         rates = info->control.rates;
 398         /* MAC control */
 399         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 400                 mac_ctl |= B43_TXH_MAC_ACK;
 401         /* use hardware sequence counter as the non-TID counter */
 402         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 403                 mac_ctl |= B43_TXH_MAC_HWSEQ;
 404         if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 405                 mac_ctl |= B43_TXH_MAC_STMSDU;
 406         if (phy->type == B43_PHYTYPE_A)
 407                 mac_ctl |= B43_TXH_MAC_5GHZ;
 408
 409         /* Overwrite rates[0].count to make the retry calculation
 410          * in the tx status easier. need the actual retry limit to
 411          * detect whether the fallback rate was used.
 412          */
 413         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 414             (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
 415                 rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
 416                 mac_ctl |= B43_TXH_MAC_LONGFRAME;
 417         } else {
 418                 rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
 419         }
 420
 421         /* Generate the RTS or CTS-to-self frame */
 422         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 423             (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
 424                 unsigned int len;
 425                 struct ieee80211_hdr *uninitialized_var(hdr);
 426                 int rts_rate, rts_rate_fb;
 427                 int rts_rate_ofdm, rts_rate_fb_ofdm;
 428                 struct b43_plcp_hdr6 *uninitialized_var(plcp);
 429                 struct ieee80211_rate *rts_cts_rate;
 430
 431                 rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);
 432
 433                 rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
 434                 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
 435                 rts_rate_fb = b43_calc_fallback_rate(rts_rate);
 436                 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
 437
 438                 if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 439                         struct ieee80211_cts *uninitialized_var(cts);
 440
 441                         switch (dev->fw.hdr_format) {
 442                         case B43_FW_HDR_598:
 443                                 cts = (struct ieee80211_cts *)
 444                                         (txhdr->format_598.rts_frame);
 445                                 break;
 446                         case B43_FW_HDR_351:
 447                                 cts = (struct ieee80211_cts *)
 448                                         (txhdr->format_351.rts_frame);
 449                                 break;
 450                         case B43_FW_HDR_410:
 451                                 cts = (struct ieee80211_cts *)
 452                                         (txhdr->format_410.rts_frame);
 453                                 break;
 454                         }
 455                         ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
 456                                                 fragment_data, fragment_len,
 457                                                 info, cts);
 458                         mac_ctl |= B43_TXH_MAC_SENDCTS;
 459                         len = sizeof(struct ieee80211_cts);
 460                 } else {
 461                         struct ieee80211_rts *uninitialized_var(rts);
 462
 463                         switch (dev->fw.hdr_format) {
 464                         case B43_FW_HDR_598:
 465                                 rts = (struct ieee80211_rts *)
 466                                         (txhdr->format_598.rts_frame);
 467                                 break;
 468                         case B43_FW_HDR_351:
 469                                 rts = (struct ieee80211_rts *)
 470                                         (txhdr->format_351.rts_frame);
 471                                 break;
 472                         case B43_FW_HDR_410:
 473                                 rts = (struct ieee80211_rts *)
 474                                         (txhdr->format_410.rts_frame);
 475                                 break;
 476                         }
 477                         ieee80211_rts_get(dev->wl->hw, info->control.vif,
 478                                           fragment_data, fragment_len,
 479                                           info, rts);
 480                         mac_ctl |= B43_TXH_MAC_SENDRTS;
 481                         len = sizeof(struct ieee80211_rts);
 482                 }
 483                 len += FCS_LEN;
 484
 485                 /* Generate the PLCP headers for the RTS/CTS frame */
 486                 switch (dev->fw.hdr_format) {
 487                 case B43_FW_HDR_598:
 488                         plcp = &txhdr->format_598.rts_plcp;
 489                         break;
 490                 case B43_FW_HDR_351:
 491                         plcp = &txhdr->format_351.rts_plcp;
 492                         break;
 493                 case B43_FW_HDR_410:
 494                         plcp = &txhdr->format_410.rts_plcp;
 495                         break;
 496                 }
 497                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 498                                       len, rts_rate);
 499                 plcp = &txhdr->rts_plcp_fb;
 500                 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
 501                                       len, rts_rate_fb);
 502
 503                 switch (dev->fw.hdr_format) {
 504                 case B43_FW_HDR_598:
 505                         hdr = (struct ieee80211_hdr *)
 506                                 (&txhdr->format_598.rts_frame);
 507                         break;
 508                 case B43_FW_HDR_351:
 509                         hdr = (struct ieee80211_hdr *)
 510                                 (&txhdr->format_351.rts_frame);
 511                         break;
 512                 case B43_FW_HDR_410:
 513                         hdr = (struct ieee80211_hdr *)
 514                                 (&txhdr->format_410.rts_frame);
 515                         break;
 516                 }
 517                 txhdr->rts_dur_fb = hdr->duration_id;
 518
 519                 if (rts_rate_ofdm) {
 520                         extra_ft |= B43_TXH_EFT_RTS_OFDM;
 521                         txhdr->phy_rate_rts =
 522                             b43_plcp_get_ratecode_ofdm(rts_rate);
 523                 } else {
 524                         extra_ft |= B43_TXH_EFT_RTS_CCK;
 525                         txhdr->phy_rate_rts =
 526                             b43_plcp_get_ratecode_cck(rts_rate);
 527                 }
 528                 if (rts_rate_fb_ofdm)
 529                         extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
 530                 else
 531                         extra_ft |= B43_TXH_EFT_RTSFB_CCK;
 532
 533                 if (rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS &&
 534                     phy->type == B43_PHYTYPE_N) {
 535                         txhdr->phy_ctl1_rts = cpu_to_le16(
 536                                 b43_generate_tx_phy_ctl1(dev, rts_rate));
 537                         txhdr->phy_ctl1_rts_fb = cpu_to_le16(
 538                                 b43_generate_tx_phy_ctl1(dev, rts_rate_fb));
 539                 }
 540         }
 541
 542         /* Magic cookie */
 543         switch (dev->fw.hdr_format) {
 544         case B43_FW_HDR_598:
 545                 txhdr->format_598.cookie = cpu_to_le16(cookie);
 546                 break;
 547         case B43_FW_HDR_351:
 548                 txhdr->format_351.cookie = cpu_to_le16(cookie);
 549                 break;
 550         case B43_FW_HDR_410:
 551                 txhdr->format_410.cookie = cpu_to_le16(cookie);
 552                 break;
 553         }
 554
 555         if (phy->type == B43_PHYTYPE_N) {
 556                 txhdr->phy_ctl1 =
 557                         cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate));
 558                 txhdr->phy_ctl1_fb =
 559                         cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate_fb));
 560         }
 561
 562         /* Apply the bitfields */
 563         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 564         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 565         txhdr->extra_ft = extra_ft;
 566
 567         return 0;
 568 }
 569
 570 static s8 b43_rssi_postprocess(struct b43_wldev *dev,
 571                                u8 in_rssi, int ofdm,
 572                                int adjust_2053, int adjust_2050)
 573 {
 574         struct b43_phy *phy = &dev->phy;
 575         struct b43_phy_g *gphy = phy->g;
 576         s32 tmp;
 577
 578         switch (phy->radio_ver) {
 579         case 0x2050:
 580                 if (ofdm) {
 581                         tmp = in_rssi;
 582                         if (tmp > 127)
 583                                 tmp -= 256;
 584                         tmp *= 73;
 585                         tmp /= 64;
 586                         if (adjust_2050)
 587                                 tmp += 25;
 588                         else
 589                                 tmp -= 3;
 590                 } else {
 591                         if (dev->dev->bus_sprom->
 592                             boardflags_lo & B43_BFL_RSSI) {
 593                                 if (in_rssi > 63)
 594                                         in_rssi = 63;
 595                                 B43_WARN_ON(phy->type != B43_PHYTYPE_G);
 596                                 tmp = gphy->nrssi_lt[in_rssi];
 597                                 tmp = 31 - tmp;
 598                                 tmp *= -131;
 599                                 tmp /= 128;
 600                                 tmp -= 57;
 601                         } else {
 602                                 tmp = in_rssi;
 603                                 tmp = 31 - tmp;
 604                                 tmp *= -149;
 605                                 tmp /= 128;
 606                                 tmp -= 68;
 607                         }
 608                         if (phy->type == B43_PHYTYPE_G && adjust_2050)
 609                                 tmp += 25;
 610                 }
 611                 break;
 612         case 0x2060:
 613                 if (in_rssi > 127)
 614                         tmp = in_rssi - 256;
 615                 else
 616                         tmp = in_rssi;
 617                 break;
 618         default:
 619                 tmp = in_rssi;
 620                 tmp -= 11;
 621                 tmp *= 103;
 622                 tmp /= 64;
 623                 if (adjust_2053)
 624                         tmp -= 109;
 625                 else
 626                         tmp -= 83;
 627         }
 628
 629         return (s8) tmp;
 630 }
 631
 632 //TODO
 633 #if 0
 634 static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
 635 {
 636         struct b43_phy *phy = &dev->phy;
 637         s8 ret;
 638
 639         if (phy->type == B43_PHYTYPE_A) {
 640                 //TODO: Incomplete specs.
 641                 ret = 0;
 642         } else
 643                 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
 644
 645         return ret;
 646 }
 647 #endif
 648
 649 void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
 650 {
 651         struct ieee80211_rx_status status;
 652         struct b43_plcp_hdr6 *plcp;
 653         struct ieee80211_hdr *wlhdr;
 654         const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
 655         __le16 fctl;
 656         u16 phystat0, phystat3;
 657         u16 uninitialized_var(chanstat), uninitialized_var(mactime);
 658         u32 uninitialized_var(macstat);
 659         u16 chanid;
 660         u16 phytype;
 661         int padding;
 662
 663         memset(&status, 0, sizeof(status));
 664
 665         /* Get metadata about the frame from the header. */
 666         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 667         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 668         switch (dev->fw.hdr_format) {
 669         case B43_FW_HDR_598:
 670                 macstat = le32_to_cpu(rxhdr->format_598.mac_status);
 671                 mactime = le16_to_cpu(rxhdr->format_598.mac_time);
 672                 chanstat = le16_to_cpu(rxhdr->format_598.channel);
 673                 break;
 674         case B43_FW_HDR_410:
 675         case B43_FW_HDR_351:
 676                 macstat = le32_to_cpu(rxhdr->format_351.mac_status);
 677                 mactime = le16_to_cpu(rxhdr->format_351.mac_time);
 678                 chanstat = le16_to_cpu(rxhdr->format_351.channel);
 679                 break;
 680         }
 681         phytype = chanstat & B43_RX_CHAN_PHYTYPE;
 682
 683         if (unlikely(macstat & B43_RX_MAC_FCSERR)) {
 684                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 685                 status.flag |= RX_FLAG_FAILED_FCS_CRC;
 686         }
 687         if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV)))
 688                 status.flag |= RX_FLAG_FAILED_PLCP_CRC;
 689         if (phystat0 & B43_RX_PHYST0_SHORTPRMBL)
 690                 status.flag |= RX_FLAG_SHORTPRE;
 691         if (macstat & B43_RX_MAC_DECERR) {
 692                 /* Decryption with the given key failed.
 693                  * Drop the packet. We also won't be able to decrypt it with
 694                  * the key in software. */
 695                 goto drop;
 696         }
 697
 698         /* Skip PLCP and padding */
 699         padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
 700         if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
 701                 b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
 702                 goto drop;
 703         }
 704         plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
 705         skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
 706         /* The skb contains the Wireless Header + payload data now */
 707         if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
 708                 b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
 709                 goto drop;
 710         }
 711         wlhdr = (struct ieee80211_hdr *)(skb->data);
 712         fctl = wlhdr->frame_control;
 713
 714         if (macstat & B43_RX_MAC_DEC) {
 715                 unsigned int keyidx;
 716                 int wlhdr_len;
 717
 718                 keyidx = ((macstat & B43_RX_MAC_KEYIDX)
 719                           >> B43_RX_MAC_KEYIDX_SHIFT);
 720                 /* We must adjust the key index here. We want the "physical"
 721                  * key index, but the ucode passed it slightly different.
 722                  */
 723                 keyidx = b43_kidx_to_raw(dev, keyidx);
 724                 B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key));
 725
 726                 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
 727                         wlhdr_len = ieee80211_hdrlen(fctl);
 728                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 729                                 b43dbg(dev->wl,
 730                                        "RX: Packet size underrun (3)\n");
 731                                 goto drop;
 732                         }
 733                         status.flag |= RX_FLAG_DECRYPTED;
 734                 }
 735         }
 736
 737         /* Link quality statistics */
 738         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 739         case B43_PHYTYPE_N:
 740                 if (rxhdr->power0 == 16 || rxhdr->power0 == 32)
 741                         status.signal = max(rxhdr->power1, rxhdr->power2);
 742                 else
 743                         status.signal = max(rxhdr->power0, rxhdr->power1);
 744                 break;
 745         case B43_PHYTYPE_A:
 746         case B43_PHYTYPE_B:
 747         case B43_PHYTYPE_G:
 748         case B43_PHYTYPE_LP:
 749                 status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
 750                                                   (phystat0 & B43_RX_PHYST0_OFDM),
 751                                                   (phystat0 & B43_RX_PHYST0_GAINCTL),
 752                                                   (phystat3 & B43_RX_PHYST3_TRSTATE));
 753                 break;
 754         }
 755
 756         if (phystat0 & B43_RX_PHYST0_OFDM)
 757                 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
 758                                                 phytype == B43_PHYTYPE_A);
 759         else
 760                 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
 761         if (unlikely(status.rate_idx == -1)) {
 762                 /* PLCP seems to be corrupted.
 763                  * Drop the frame, if we are not interested in corrupted frames. */
 764                 if (!(dev->wl->filter_flags & FIF_PLCPFAIL))
 765                         goto drop;
 766         }
 767         status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
 768
 769         /*
 770          * All frames on monitor interfaces and beacons always need a full
 771          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 772          * purposes and beacons for IBSS merging.
 773          * This code assumes we get to process the packet within 16 bits
 774          * of timestamp, i.e. about 65 milliseconds after the PHY received
 775          * the first symbol.
 776          */
 777         if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
 778                 u16 low_mactime_now;
 779
 780                 b43_tsf_read(dev, &status.mactime);
 781                 low_mactime_now = status.mactime;
 782                 status.mactime = status.mactime & ~0xFFFFULL;
 783                 status.mactime += mactime;
 784                 if (low_mactime_now <= mactime)
 785                         status.mactime -= 0x10000;
 786                 status.flag |= RX_FLAG_MACTIME_MPDU;
 787         }
 788
 789         chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
 790         switch (chanstat & B43_RX_CHAN_PHYTYPE) {
 791         case B43_PHYTYPE_A:
 792                 status.band = IEEE80211_BAND_5GHZ;
 793                 B43_WARN_ON(1);
 794                 /* FIXME: We don't really know which value the "chanid" contains.
 795                  *        So the following assignment might be wrong. */
 796                 status.freq = b43_channel_to_freq_5ghz(chanid);
 797                 break;
 798         case B43_PHYTYPE_G:
 799                 status.band = IEEE80211_BAND_2GHZ;
 800                 /* chanid is the radio channel cookie value as used
 801                  * to tune the radio. */
 802                 status.freq = chanid + 2400;
 803                 break;
 804         case B43_PHYTYPE_N:
 805         case B43_PHYTYPE_LP:
 806         case B43_PHYTYPE_HT:
 807                 /* chanid is the SHM channel cookie. Which is the plain
 808                  * channel number in b43. */
 809                 if (chanstat & B43_RX_CHAN_5GHZ) {
 810                         status.band = IEEE80211_BAND_5GHZ;
 811                         status.freq = b43_freq_to_channel_5ghz(chanid);
 812                 } else {
 813                         status.band = IEEE80211_BAND_2GHZ;
 814                         status.freq = b43_freq_to_channel_2ghz(chanid);
 815                 }
 816                 break;
 817         default:
 818                 B43_WARN_ON(1);
 819                 goto drop;
 820         }
 821
 822         memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
 823         ieee80211_rx_ni(dev->wl->hw, skb);
 824
 825 #if B43_DEBUG
 826         dev->rx_count++;
 827 #endif
 828         return;
 829 drop:
 830         b43dbg(dev->wl, "RX: Packet dropped\n");
 831         dev_kfree_skb_any(skb);
 832 }
 833
 834 void b43_handle_txstatus(struct b43_wldev *dev,
 835                          const struct b43_txstatus *status)
 836 {
 837         b43_debugfs_log_txstat(dev, status);
 838
 839         if (status->intermediate)
 840                 return;
 841         if (status->for_ampdu)
 842                 return;
 843         if (!status->acked)
 844                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 845         if (status->rts_count) {
 846                 if (status->rts_count == 0xF)   //FIXME
 847                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 848                 else
 849                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 850         }
 851
 852         if (b43_using_pio_transfers(dev))
 853                 b43_pio_handle_txstatus(dev, status);
 854         else
 855                 b43_dma_handle_txstatus(dev, status);
 856
 857         b43_phy_txpower_check(dev, 0);
 858 }
 859
 860 /* Fill out the mac80211 TXstatus report based on the b43-specific
 861  * txstatus report data. This returns a boolean whether the frame was
 862  * successfully transmitted. */
 863 bool b43_fill_txstatus_report(struct b43_wldev *dev,
 864                               struct ieee80211_tx_info *report,
 865                               const struct b43_txstatus *status)
 866 {
 867         bool frame_success = 1;
 868         int retry_limit;
 869
 870         /* preserve the confiured retry limit before clearing the status
 871          * The xmit function has overwritten the rc's value with the actual
 872          * retry limit done by the hardware */
 873         retry_limit = report->status.rates[0].count;
 874         ieee80211_tx_info_clear_status(report);
 875
 876         if (status->acked) {
 877                 /* The frame was ACKed. */
 878                 report->flags |= IEEE80211_TX_STAT_ACK;
 879         } else {
 880                 /* The frame was not ACKed... */
 881                 if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
 882                         /* ...but we expected an ACK. */
 883                         frame_success = 0;
 884                 }
 885         }
 886         if (status->frame_count == 0) {
 887                 /* The frame was not transmitted at all. */
 888                 report->status.rates[0].count = 0;
 889         } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
 890                 /*
 891                  * If the short retries (RTS, not data frame) have exceeded
 892                  * the limit, the hw will not have tried the selected rate,
 893                  * but will have used the fallback rate instead.
 894                  * Don't let the rate control count attempts for the selected
 895                  * rate in this case, otherwise the statistics will be off.
 896                  */
 897                 report->status.rates[0].count = 0;
 898                 report->status.rates[1].count = status->frame_count;
 899         } else {
 900                 if (status->frame_count > retry_limit) {
 901                         report->status.rates[0].count = retry_limit;
 902                         report->status.rates[1].count = status->frame_count -
 903                                         retry_limit;
 904
 905                 } else {
 906                         report->status.rates[0].count = status->frame_count;
 907                         report->status.rates[1].idx = -1;
 908                 }
 909         }
 910
 911         return frame_success;
 912 }
 913
 914 /* Stop any TX operation on the device (suspend the hardware queues) */
 915 void b43_tx_suspend(struct b43_wldev *dev)
 916 {
 917         if (b43_using_pio_transfers(dev))
 918                 b43_pio_tx_suspend(dev);
 919         else
 920                 b43_dma_tx_suspend(dev);
 921 }
 922
 923 /* Resume any TX operation on the device (resume the hardware queues) */
 924 void b43_tx_resume(struct b43_wldev *dev)
 925 {
 926         if (b43_using_pio_transfers(dev))
 927                 b43_pio_tx_resume(dev);
 928         else
 929                 b43_dma_tx_resume(dev);
 930 }