drivers/net/wireless/b43legacy/xmit.c

   1 /*
   2
   3   Broadcom B43legacy 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   Copyright (C) 2007 Larry Finger <Larry.Finger@lwfinger.net>
  13
  14   This program is free software; you can redistribute it and/or modify
  15   it under the terms of the GNU General Public License as published by
  16   the Free Software Foundation; either version 2 of the License, or
  17   (at your option) any later version.
  18
  19   This program is distributed in the hope that it will be useful,
  20   but WITHOUT ANY WARRANTY; without even the implied warranty of
  21   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22   GNU General Public License for more details.
  23
  24   You should have received a copy of the GNU General Public License
  25   along with this program; see the file COPYING.  If not, write to
  26   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  27   Boston, MA 02110-1301, USA.
  28
  29 */
  30
  31 #include <net/dst.h>
  32
  33 #include "xmit.h"
  34 #include "phy.h"
  35 #include "dma.h"
  36 #include "pio.h"
  37
  38
  39 /* Extract the bitrate out of a CCK PLCP header. */
  40 static u8 b43legacy_plcp_get_bitrate_cck(struct b43legacy_plcp_hdr6 *plcp)
  41 {
  42         switch (plcp->raw[0]) {
  43         case 0x0A:
  44                 return B43legacy_CCK_RATE_1MB;
  45         case 0x14:
  46                 return B43legacy_CCK_RATE_2MB;
  47         case 0x37:
  48                 return B43legacy_CCK_RATE_5MB;
  49         case 0x6E:
  50                 return B43legacy_CCK_RATE_11MB;
  51         }
  52         B43legacy_BUG_ON(1);
  53         return 0;
  54 }
  55
  56 /* Extract the bitrate out of an OFDM PLCP header. */
  57 static u8 b43legacy_plcp_get_bitrate_ofdm(struct b43legacy_plcp_hdr6 *plcp)
  58 {
  59         switch (plcp->raw[0] & 0xF) {
  60         case 0xB:
  61                 return B43legacy_OFDM_RATE_6MB;
  62         case 0xF:
  63                 return B43legacy_OFDM_RATE_9MB;
  64         case 0xA:
  65                 return B43legacy_OFDM_RATE_12MB;
  66         case 0xE:
  67                 return B43legacy_OFDM_RATE_18MB;
  68         case 0x9:
  69                 return B43legacy_OFDM_RATE_24MB;
  70         case 0xD:
  71                 return B43legacy_OFDM_RATE_36MB;
  72         case 0x8:
  73                 return B43legacy_OFDM_RATE_48MB;
  74         case 0xC:
  75                 return B43legacy_OFDM_RATE_54MB;
  76         }
  77         B43legacy_BUG_ON(1);
  78         return 0;
  79 }
  80
  81 u8 b43legacy_plcp_get_ratecode_cck(const u8 bitrate)
  82 {
  83         switch (bitrate) {
  84         case B43legacy_CCK_RATE_1MB:
  85                 return 0x0A;
  86         case B43legacy_CCK_RATE_2MB:
  87                 return 0x14;
  88         case B43legacy_CCK_RATE_5MB:
  89                 return 0x37;
  90         case B43legacy_CCK_RATE_11MB:
  91                 return 0x6E;
  92         }
  93         B43legacy_BUG_ON(1);
  94         return 0;
  95 }
  96
  97 u8 b43legacy_plcp_get_ratecode_ofdm(const u8 bitrate)
  98 {
  99         switch (bitrate) {
 100         case B43legacy_OFDM_RATE_6MB:
 101                 return 0xB;
 102         case B43legacy_OFDM_RATE_9MB:
 103                 return 0xF;
 104         case B43legacy_OFDM_RATE_12MB:
 105                 return 0xA;
 106         case B43legacy_OFDM_RATE_18MB:
 107                 return 0xE;
 108         case B43legacy_OFDM_RATE_24MB:
 109                 return 0x9;
 110         case B43legacy_OFDM_RATE_36MB:
 111                 return 0xD;
 112         case B43legacy_OFDM_RATE_48MB:
 113                 return 0x8;
 114         case B43legacy_OFDM_RATE_54MB:
 115                 return 0xC;
 116         }
 117         B43legacy_BUG_ON(1);
 118         return 0;
 119 }
 120
 121 void b43legacy_generate_plcp_hdr(struct b43legacy_plcp_hdr4 *plcp,
 122                                  const u16 octets, const u8 bitrate)
 123 {
 124         __le32 *data = &(plcp->data);
 125         __u8 *raw = plcp->raw;
 126
 127         if (b43legacy_is_ofdm_rate(bitrate)) {
 128                 u16 d;
 129
 130                 d = b43legacy_plcp_get_ratecode_ofdm(bitrate);
 131                 B43legacy_WARN_ON(octets & 0xF000);
 132                 d |= (octets << 5);
 133                 *data = cpu_to_le32(d);
 134         } else {
 135                 u32 plen;
 136
 137                 plen = octets * 16 / bitrate;
 138                 if ((octets * 16 % bitrate) > 0) {
 139                         plen++;
 140                         if ((bitrate == B43legacy_CCK_RATE_11MB)
 141                             && ((octets * 8 % 11) < 4))
 142                                 raw[1] = 0x84;
 143                         else
 144                                 raw[1] = 0x04;
 145                 } else
 146                         raw[1] = 0x04;
 147                 *data |= cpu_to_le32(plen << 16);
 148                 raw[0] = b43legacy_plcp_get_ratecode_cck(bitrate);
 149         }
 150 }
 151
 152 static u8 b43legacy_calc_fallback_rate(u8 bitrate)
 153 {
 154         switch (bitrate) {
 155         case B43legacy_CCK_RATE_1MB:
 156                 return B43legacy_CCK_RATE_1MB;
 157         case B43legacy_CCK_RATE_2MB:
 158                 return B43legacy_CCK_RATE_1MB;
 159         case B43legacy_CCK_RATE_5MB:
 160                 return B43legacy_CCK_RATE_2MB;
 161         case B43legacy_CCK_RATE_11MB:
 162                 return B43legacy_CCK_RATE_5MB;
 163         case B43legacy_OFDM_RATE_6MB:
 164                 return B43legacy_CCK_RATE_5MB;
 165         case B43legacy_OFDM_RATE_9MB:
 166                 return B43legacy_OFDM_RATE_6MB;
 167         case B43legacy_OFDM_RATE_12MB:
 168                 return B43legacy_OFDM_RATE_9MB;
 169         case B43legacy_OFDM_RATE_18MB:
 170                 return B43legacy_OFDM_RATE_12MB;
 171         case B43legacy_OFDM_RATE_24MB:
 172                 return B43legacy_OFDM_RATE_18MB;
 173         case B43legacy_OFDM_RATE_36MB:
 174                 return B43legacy_OFDM_RATE_24MB;
 175         case B43legacy_OFDM_RATE_48MB:
 176                 return B43legacy_OFDM_RATE_36MB;
 177         case B43legacy_OFDM_RATE_54MB:
 178                 return B43legacy_OFDM_RATE_48MB;
 179         }
 180         B43legacy_BUG_ON(1);
 181         return 0;
 182 }
 183
 184 static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
 185                                struct b43legacy_txhdr_fw3 *txhdr,
 186                                const unsigned char *fragment_data,
 187                                unsigned int fragment_len,
 188                                const struct ieee80211_tx_control *txctl,
 189                                u16 cookie)
 190 {
 191         const struct ieee80211_hdr *wlhdr;
 192         int use_encryption = (!(txctl->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT));
 193         u16 fctl;
 194         u8 rate;
 195         u8 rate_fb;
 196         int rate_ofdm;
 197         int rate_fb_ofdm;
 198         unsigned int plcp_fragment_len;
 199         u32 mac_ctl = 0;
 200         u16 phy_ctl = 0;
 201
 202         wlhdr = (const struct ieee80211_hdr *)fragment_data;
 203         fctl = le16_to_cpu(wlhdr->frame_control);
 204
 205         memset(txhdr, 0, sizeof(*txhdr));
 206
 207         rate = txctl->tx_rate;
 208         rate_ofdm = b43legacy_is_ofdm_rate(rate);
 209         rate_fb = (txctl->alt_retry_rate == -1) ? rate : txctl->alt_retry_rate;
 210         rate_fb_ofdm = b43legacy_is_ofdm_rate(rate_fb);
 211
 212         txhdr->mac_frame_ctl = wlhdr->frame_control;
 213         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 214
 215         /* Calculate duration for fallback rate */
 216         if ((rate_fb == rate) ||
 217             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 218             (wlhdr->duration_id == cpu_to_le16(0))) {
 219                 /* If the fallback rate equals the normal rate or the
 220                  * dur_id field contains an AID, CFP magic or 0,
 221                  * use the original dur_id field. */
 222                 txhdr->dur_fb = wlhdr->duration_id;
 223         } else {
 224                 int fbrate_base100kbps = B43legacy_RATE_TO_100KBPS(rate_fb);
 225                 txhdr->dur_fb = ieee80211_generic_frame_duration(dev->wl->hw,
 226                                                          txctl->vif,
 227                                                          fragment_len,
 228                                                          fbrate_base100kbps);
 229         }
 230
 231         plcp_fragment_len = fragment_len + FCS_LEN;
 232         if (use_encryption) {
 233                 u8 key_idx = (u16)(txctl->key_idx);
 234                 struct b43legacy_key *key;
 235                 int wlhdr_len;
 236                 size_t iv_len;
 237
 238                 B43legacy_WARN_ON(key_idx >= dev->max_nr_keys);
 239                 key = &(dev->key[key_idx]);
 240
 241                 if (key->enabled) {
 242                         /* Hardware appends ICV. */
 243                         plcp_fragment_len += txctl->icv_len;
 244
 245                         key_idx = b43legacy_kidx_to_fw(dev, key_idx);
 246                         mac_ctl |= (key_idx << B43legacy_TX4_MAC_KEYIDX_SHIFT) &
 247                                    B43legacy_TX4_MAC_KEYIDX;
 248                         mac_ctl |= (key->algorithm <<
 249                                    B43legacy_TX4_MAC_KEYALG_SHIFT) &
 250                                    B43legacy_TX4_MAC_KEYALG;
 251                         wlhdr_len = ieee80211_get_hdrlen(fctl);
 252                         iv_len = min((size_t)txctl->iv_len,
 253                                      ARRAY_SIZE(txhdr->iv));
 254                         memcpy(txhdr->iv, ((u8 *)wlhdr) + wlhdr_len, iv_len);
 255                 } else {
 256                         /* This key is invalid. This might only happen
 257                          * in a short timeframe after machine resume before
 258                          * we were able to reconfigure keys.
 259                          * Drop this packet completely. Do not transmit it
 260                          * unencrypted to avoid leaking information. */
 261                         return -ENOKEY;
 262                 }
 263         }
 264         b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 265                                     (&txhdr->plcp), plcp_fragment_len,
 266                                     rate);
 267         b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 268                                     (&txhdr->plcp_fb), plcp_fragment_len,
 269                                     rate_fb);
 270
 271         /* PHY TX Control word */
 272         if (rate_ofdm)
 273                 phy_ctl |= B43legacy_TX4_PHY_OFDM;
 274         if (dev->short_preamble)
 275                 phy_ctl |= B43legacy_TX4_PHY_SHORTPRMBL;
 276         switch (txctl->antenna_sel_tx) {
 277         case 0:
 278                 phy_ctl |= B43legacy_TX4_PHY_ANTLAST;
 279                 break;
 280         case 1:
 281                 phy_ctl |= B43legacy_TX4_PHY_ANT0;
 282                 break;
 283         case 2:
 284                 phy_ctl |= B43legacy_TX4_PHY_ANT1;
 285                 break;
 286         default:
 287                 B43legacy_BUG_ON(1);
 288         }
 289
 290         /* MAC control */
 291         if (!(txctl->flags & IEEE80211_TXCTL_NO_ACK))
 292                 mac_ctl |= B43legacy_TX4_MAC_ACK;
 293         if (!(((fctl & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
 294               ((fctl & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)))
 295                 mac_ctl |= B43legacy_TX4_MAC_HWSEQ;
 296         if (txctl->flags & IEEE80211_TXCTL_FIRST_FRAGMENT)
 297                 mac_ctl |= B43legacy_TX4_MAC_STMSDU;
 298         if (rate_fb_ofdm)
 299                 mac_ctl |= B43legacy_TX4_MAC_FALLBACKOFDM;
 300         if (txctl->flags & IEEE80211_TXCTL_LONG_RETRY_LIMIT)
 301                 mac_ctl |= B43legacy_TX4_MAC_LONGFRAME;
 302
 303         /* Generate the RTS or CTS-to-self frame */
 304         if ((txctl->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
 305             (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
 306                 unsigned int len;
 307                 struct ieee80211_hdr *hdr;
 308                 int rts_rate;
 309                 int rts_rate_fb;
 310                 int rts_rate_ofdm;
 311                 int rts_rate_fb_ofdm;
 312
 313                 rts_rate = txctl->rts_cts_rate;
 314                 rts_rate_ofdm = b43legacy_is_ofdm_rate(rts_rate);
 315                 rts_rate_fb = b43legacy_calc_fallback_rate(rts_rate);
 316                 rts_rate_fb_ofdm = b43legacy_is_ofdm_rate(rts_rate_fb);
 317                 if (rts_rate_fb_ofdm)
 318                         mac_ctl |= B43legacy_TX4_MAC_CTSFALLBACKOFDM;
 319
 320                 if (txctl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) {
 321                         ieee80211_ctstoself_get(dev->wl->hw,
 322                                                 txctl->vif,
 323                                                 fragment_data,
 324                                                 fragment_len, txctl,
 325                                                 (struct ieee80211_cts *)
 326                                                 (txhdr->rts_frame));
 327                         mac_ctl |= B43legacy_TX4_MAC_SENDCTS;
 328                         len = sizeof(struct ieee80211_cts);
 329                 } else {
 330                         ieee80211_rts_get(dev->wl->hw,
 331                                           txctl->vif,
 332                                           fragment_data, fragment_len, txctl,
 333                                           (struct ieee80211_rts *)
 334                                           (txhdr->rts_frame));
 335                         mac_ctl |= B43legacy_TX4_MAC_SENDRTS;
 336                         len = sizeof(struct ieee80211_rts);
 337                 }
 338                 len += FCS_LEN;
 339                 b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 340                                             (&txhdr->rts_plcp),
 341                                             len, rts_rate);
 342                 b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 343                                             (&txhdr->rts_plcp_fb),
 344                                             len, rts_rate_fb);
 345                 hdr = (struct ieee80211_hdr *)(&txhdr->rts_frame);
 346                 txhdr->rts_dur_fb = hdr->duration_id;
 347         }
 348
 349         /* Magic cookie */
 350         txhdr->cookie = cpu_to_le16(cookie);
 351
 352         /* Apply the bitfields */
 353         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 354         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 355
 356         return 0;
 357 }
 358
 359 int b43legacy_generate_txhdr(struct b43legacy_wldev *dev,
 360                               u8 *txhdr,
 361                               const unsigned char *fragment_data,
 362                               unsigned int fragment_len,
 363                               const struct ieee80211_tx_control *txctl,
 364                               u16 cookie)
 365 {
 366         return generate_txhdr_fw3(dev, (struct b43legacy_txhdr_fw3 *)txhdr,
 367                            fragment_data, fragment_len,
 368                            txctl, cookie);
 369 }
 370
 371 static s8 b43legacy_rssi_postprocess(struct b43legacy_wldev *dev,
 372                                      u8 in_rssi, int ofdm,
 373                                      int adjust_2053, int adjust_2050)
 374 {
 375         struct b43legacy_phy *phy = &dev->phy;
 376         s32 tmp;
 377
 378         switch (phy->radio_ver) {
 379         case 0x2050:
 380                 if (ofdm) {
 381                         tmp = in_rssi;
 382                         if (tmp > 127)
 383                                 tmp -= 256;
 384                         tmp *= 73;
 385                         tmp /= 64;
 386                         if (adjust_2050)
 387                                 tmp += 25;
 388                         else
 389                                 tmp -= 3;
 390                 } else {
 391                         if (dev->dev->bus->sprom.boardflags_lo
 392                             & B43legacy_BFL_RSSI) {
 393                                 if (in_rssi > 63)
 394                                         in_rssi = 63;
 395                                 tmp = phy->nrssi_lt[in_rssi];
 396                                 tmp = 31 - tmp;
 397                                 tmp *= -131;
 398                                 tmp /= 128;
 399                                 tmp -= 57;
 400                         } else {
 401                                 tmp = in_rssi;
 402                                 tmp = 31 - tmp;
 403                                 tmp *= -149;
 404                                 tmp /= 128;
 405                                 tmp -= 68;
 406                         }
 407                         if (phy->type == B43legacy_PHYTYPE_G &&
 408                             adjust_2050)
 409                                 tmp += 25;
 410                 }
 411                 break;
 412         case 0x2060:
 413                 if (in_rssi > 127)
 414                         tmp = in_rssi - 256;
 415                 else
 416                         tmp = in_rssi;
 417                 break;
 418         default:
 419                 tmp = in_rssi;
 420                 tmp -= 11;
 421                 tmp *= 103;
 422                 tmp /= 64;
 423                 if (adjust_2053)
 424                         tmp -= 109;
 425                 else
 426                         tmp -= 83;
 427         }
 428
 429         return (s8)tmp;
 430 }
 431
 432 void b43legacy_rx(struct b43legacy_wldev *dev,
 433                   struct sk_buff *skb,
 434                   const void *_rxhdr)
 435 {
 436         struct ieee80211_rx_status status;
 437         struct b43legacy_plcp_hdr6 *plcp;
 438         struct ieee80211_hdr *wlhdr;
 439         const struct b43legacy_rxhdr_fw3 *rxhdr = _rxhdr;
 440         u16 fctl;
 441         u16 phystat0;
 442         u16 phystat3;
 443         u16 chanstat;
 444         u16 mactime;
 445         u32 macstat;
 446         u16 chanid;
 447         u8 jssi;
 448         int padding;
 449
 450         memset(&status, 0, sizeof(status));
 451
 452         /* Get metadata about the frame from the header. */
 453         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 454         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 455         jssi = rxhdr->jssi;
 456         macstat = le16_to_cpu(rxhdr->mac_status);
 457         mactime = le16_to_cpu(rxhdr->mac_time);
 458         chanstat = le16_to_cpu(rxhdr->channel);
 459
 460         if (macstat & B43legacy_RX_MAC_FCSERR)
 461                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 462
 463         /* Skip PLCP and padding */
 464         padding = (macstat & B43legacy_RX_MAC_PADDING) ? 2 : 0;
 465         if (unlikely(skb->len < (sizeof(struct b43legacy_plcp_hdr6) +
 466             padding))) {
 467                 b43legacydbg(dev->wl, "RX: Packet size underrun (1)\n");
 468                 goto drop;
 469         }
 470         plcp = (struct b43legacy_plcp_hdr6 *)(skb->data + padding);
 471         skb_pull(skb, sizeof(struct b43legacy_plcp_hdr6) + padding);
 472         /* The skb contains the Wireless Header + payload data now */
 473         if (unlikely(skb->len < (2+2+6/*minimum hdr*/ + FCS_LEN))) {
 474                 b43legacydbg(dev->wl, "RX: Packet size underrun (2)\n");
 475                 goto drop;
 476         }
 477         wlhdr = (struct ieee80211_hdr *)(skb->data);
 478         fctl = le16_to_cpu(wlhdr->frame_control);
 479
 480         if ((macstat & B43legacy_RX_MAC_DEC) &&
 481             !(macstat & B43legacy_RX_MAC_DECERR)) {
 482                 unsigned int keyidx;
 483                 int wlhdr_len;
 484                 int iv_len;
 485                 int icv_len;
 486
 487                 keyidx = ((macstat & B43legacy_RX_MAC_KEYIDX)
 488                           >> B43legacy_RX_MAC_KEYIDX_SHIFT);
 489                 /* We must adjust the key index here. We want the "physical"
 490                  * key index, but the ucode passed it slightly different.
 491                  */
 492                 keyidx = b43legacy_kidx_to_raw(dev, keyidx);
 493                 B43legacy_WARN_ON(keyidx >= dev->max_nr_keys);
 494
 495                 if (dev->key[keyidx].algorithm != B43legacy_SEC_ALGO_NONE) {
 496                         /* Remove PROTECTED flag to mark it as decrypted. */
 497                         B43legacy_WARN_ON(!(fctl & IEEE80211_FCTL_PROTECTED));
 498                         fctl &= ~IEEE80211_FCTL_PROTECTED;
 499                         wlhdr->frame_control = cpu_to_le16(fctl);
 500
 501                         wlhdr_len = ieee80211_get_hdrlen(fctl);
 502                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 503                                 b43legacydbg(dev->wl, "RX: Packet size"
 504                                              " underrun3\n");
 505                                 goto drop;
 506                         }
 507                         if (skb->data[wlhdr_len + 3] & (1 << 5)) {
 508                                 /* The Ext-IV Bit is set in the "KeyID"
 509                                  * octet of the IV.
 510                                  */
 511                                 iv_len = 8;
 512                                 icv_len = 8;
 513                         } else {
 514                                 iv_len = 4;
 515                                 icv_len = 4;
 516                         }
 517                         if (unlikely(skb->len < (wlhdr_len + iv_len +
 518                             icv_len))) {
 519                                 b43legacydbg(dev->wl, "RX: Packet size"
 520                                              " underrun4\n");
 521                                 goto drop;
 522                         }
 523                         /* Remove the IV */
 524                         memmove(skb->data + iv_len, skb->data, wlhdr_len);
 525                         skb_pull(skb, iv_len);
 526                         /* Remove the ICV */
 527                         skb_trim(skb, skb->len - icv_len);
 528
 529                         status.flag |= RX_FLAG_DECRYPTED;
 530                 }
 531         }
 532
 533         status.ssi = b43legacy_rssi_postprocess(dev, jssi,
 534                                       (phystat0 & B43legacy_RX_PHYST0_OFDM),
 535                                       (phystat0 & B43legacy_RX_PHYST0_GAINCTL),
 536                                       (phystat3 & B43legacy_RX_PHYST3_TRSTATE));
 537         status.noise = dev->stats.link_noise;
 538         status.signal = (jssi * 100) / B43legacy_RX_MAX_SSI;
 539         if (phystat0 & B43legacy_RX_PHYST0_OFDM)
 540                 status.rate = b43legacy_plcp_get_bitrate_ofdm(plcp);
 541         else
 542                 status.rate = b43legacy_plcp_get_bitrate_cck(plcp);
 543         status.antenna = !!(phystat0 & B43legacy_RX_PHYST0_ANT);
 544
 545         /*
 546          * If monitors are present get full 64-bit timestamp. This
 547          * code assumes we get to process the packet within 16 bits
 548          * of timestamp, i.e. about 65 milliseconds after the PHY
 549          * received the first symbol.
 550          */
 551         if (dev->wl->radiotap_enabled) {
 552                 u16 low_mactime_now;
 553
 554                 b43legacy_tsf_read(dev, &status.mactime);
 555                 low_mactime_now = status.mactime;
 556                 status.mactime = status.mactime & ~0xFFFFULL;
 557                 status.mactime += mactime;
 558                 if (low_mactime_now <= mactime)
 559                         status.mactime -= 0x10000;
 560                 status.flag |= RX_FLAG_TSFT;
 561         }
 562
 563         chanid = (chanstat & B43legacy_RX_CHAN_ID) >>
 564                   B43legacy_RX_CHAN_ID_SHIFT;
 565         switch (chanstat & B43legacy_RX_CHAN_PHYTYPE) {
 566         case B43legacy_PHYTYPE_B:
 567                 status.phymode = MODE_IEEE80211B;
 568                 status.freq = chanid + 2400;
 569                 status.channel = b43legacy_freq_to_channel_bg(chanid + 2400);
 570                 break;
 571         case B43legacy_PHYTYPE_G:
 572                 status.phymode = MODE_IEEE80211G;
 573                 status.freq = chanid + 2400;
 574                 status.channel = b43legacy_freq_to_channel_bg(chanid + 2400);
 575                 break;
 576         default:
 577                 b43legacywarn(dev->wl, "Unexpected value for chanstat (0x%X)\n",
 578                        chanstat);
 579         }
 580
 581         dev->stats.last_rx = jiffies;
 582         ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);
 583
 584         return;
 585 drop:
 586         b43legacydbg(dev->wl, "RX: Packet dropped\n");
 587         dev_kfree_skb_any(skb);
 588 }
 589
 590 void b43legacy_handle_txstatus(struct b43legacy_wldev *dev,
 591                              const struct b43legacy_txstatus *status)
 592 {
 593         b43legacy_debugfs_log_txstat(dev, status);
 594
 595         if (status->intermediate)
 596                 return;
 597         if (status->for_ampdu)
 598                 return;
 599         if (!status->acked)
 600                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 601         if (status->rts_count) {
 602                 if (status->rts_count == 0xF) /* FIXME */
 603                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 604                 else
 605                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 606         }
 607
 608         if (b43legacy_using_pio(dev))
 609                 b43legacy_pio_handle_txstatus(dev, status);
 610         else
 611                 b43legacy_dma_handle_txstatus(dev, status);
 612 }
 613
 614 /* Handle TX status report as received through DMA/PIO queues */
 615 void b43legacy_handle_hwtxstatus(struct b43legacy_wldev *dev,
 616                                  const struct b43legacy_hwtxstatus *hw)
 617 {
 618         struct b43legacy_txstatus status;
 619         u8 tmp;
 620
 621         status.cookie = le16_to_cpu(hw->cookie);
 622         status.seq = le16_to_cpu(hw->seq);
 623         status.phy_stat = hw->phy_stat;
 624         tmp = hw->count;
 625         status.frame_count = (tmp >> 4);
 626         status.rts_count = (tmp & 0x0F);
 627         tmp = hw->flags;
 628         status.supp_reason = ((tmp & 0x1C) >> 2);
 629         status.pm_indicated = !!(tmp & 0x80);
 630         status.intermediate = !!(tmp & 0x40);
 631         status.for_ampdu = !!(tmp & 0x20);
 632         status.acked = !!(tmp & 0x02);
 633
 634         b43legacy_handle_txstatus(dev, &status);
 635 }
 636
 637 /* Stop any TX operation on the device (suspend the hardware queues) */
 638 void b43legacy_tx_suspend(struct b43legacy_wldev *dev)
 639 {
 640         if (b43legacy_using_pio(dev))
 641                 b43legacy_pio_freeze_txqueues(dev);
 642         else
 643                 b43legacy_dma_tx_suspend(dev);
 644 }
 645
 646 /* Resume any TX operation on the device (resume the hardware queues) */
 647 void b43legacy_tx_resume(struct b43legacy_wldev *dev)
 648 {
 649         if (b43legacy_using_pio(dev))
 650                 b43legacy_pio_thaw_txqueues(dev);
 651         else
 652                 b43legacy_dma_tx_resume(dev);
 653 }
 654
 655 /* Initialize the QoS parameters */
 656 void b43legacy_qos_init(struct b43legacy_wldev *dev)
 657 {
 658         /* FIXME: This function must probably be called from the mac80211
 659          * config callback. */
 660 return;
 661
 662         b43legacy_hf_write(dev, b43legacy_hf_read(dev) | B43legacy_HF_EDCF);
 663         /* FIXME kill magic */
 664         b43legacy_write16(dev, 0x688,
 665                           b43legacy_read16(dev, 0x688) | 0x4);
 666
 667
 668         /*TODO: We might need some stack support here to get the values. */
 669 }