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 <m@bues.ch>
  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_idx_cck(struct b43legacy_plcp_hdr6 *plcp)
  41 {
  42         switch (plcp->raw[0]) {
  43         case 0x0A:
  44                 return 0;
  45         case 0x14:
  46                 return 1;
  47         case 0x37:
  48                 return 2;
  49         case 0x6E:
  50                 return 3;
  51         }
  52         B43legacy_BUG_ON(1);
  53         return -1;
  54 }
  55
  56 /* Extract the bitrate out of an OFDM PLCP header. */
  57 static u8 b43legacy_plcp_get_bitrate_idx_ofdm(struct b43legacy_plcp_hdr6 *plcp,
  58                                               bool aphy)
  59 {
  60         int base = aphy ? 0 : 4;
  61
  62         switch (plcp->raw[0] & 0xF) {
  63         case 0xB:
  64                 return base + 0;
  65         case 0xF:
  66                 return base + 1;
  67         case 0xA:
  68                 return base + 2;
  69         case 0xE:
  70                 return base + 3;
  71         case 0x9:
  72                 return base + 4;
  73         case 0xD:
  74                 return base + 5;
  75         case 0x8:
  76                 return base + 6;
  77         case 0xC:
  78                 return base + 7;
  79         }
  80         B43legacy_BUG_ON(1);
  81         return -1;
  82 }
  83
  84 u8 b43legacy_plcp_get_ratecode_cck(const u8 bitrate)
  85 {
  86         switch (bitrate) {
  87         case B43legacy_CCK_RATE_1MB:
  88                 return 0x0A;
  89         case B43legacy_CCK_RATE_2MB:
  90                 return 0x14;
  91         case B43legacy_CCK_RATE_5MB:
  92                 return 0x37;
  93         case B43legacy_CCK_RATE_11MB:
  94                 return 0x6E;
  95         }
  96         B43legacy_BUG_ON(1);
  97         return 0;
  98 }
  99
 100 u8 b43legacy_plcp_get_ratecode_ofdm(const u8 bitrate)
 101 {
 102         switch (bitrate) {
 103         case B43legacy_OFDM_RATE_6MB:
 104                 return 0xB;
 105         case B43legacy_OFDM_RATE_9MB:
 106                 return 0xF;
 107         case B43legacy_OFDM_RATE_12MB:
 108                 return 0xA;
 109         case B43legacy_OFDM_RATE_18MB:
 110                 return 0xE;
 111         case B43legacy_OFDM_RATE_24MB:
 112                 return 0x9;
 113         case B43legacy_OFDM_RATE_36MB:
 114                 return 0xD;
 115         case B43legacy_OFDM_RATE_48MB:
 116                 return 0x8;
 117         case B43legacy_OFDM_RATE_54MB:
 118                 return 0xC;
 119         }
 120         B43legacy_BUG_ON(1);
 121         return 0;
 122 }
 123
 124 void b43legacy_generate_plcp_hdr(struct b43legacy_plcp_hdr4 *plcp,
 125                                  const u16 octets, const u8 bitrate)
 126 {
 127         __le32 *data = &(plcp->data);
 128         __u8 *raw = plcp->raw;
 129
 130         if (b43legacy_is_ofdm_rate(bitrate)) {
 131                 u16 d;
 132
 133                 d = b43legacy_plcp_get_ratecode_ofdm(bitrate);
 134                 B43legacy_WARN_ON(octets & 0xF000);
 135                 d |= (octets << 5);
 136                 *data = cpu_to_le32(d);
 137         } else {
 138                 u32 plen;
 139
 140                 plen = octets * 16 / bitrate;
 141                 if ((octets * 16 % bitrate) > 0) {
 142                         plen++;
 143                         if ((bitrate == B43legacy_CCK_RATE_11MB)
 144                             && ((octets * 8 % 11) < 4))
 145                                 raw[1] = 0x84;
 146                         else
 147                                 raw[1] = 0x04;
 148                 } else
 149                         raw[1] = 0x04;
 150                 *data |= cpu_to_le32(plen << 16);
 151                 raw[0] = b43legacy_plcp_get_ratecode_cck(bitrate);
 152         }
 153 }
 154
 155 static u8 b43legacy_calc_fallback_rate(u8 bitrate)
 156 {
 157         switch (bitrate) {
 158         case B43legacy_CCK_RATE_1MB:
 159                 return B43legacy_CCK_RATE_1MB;
 160         case B43legacy_CCK_RATE_2MB:
 161                 return B43legacy_CCK_RATE_1MB;
 162         case B43legacy_CCK_RATE_5MB:
 163                 return B43legacy_CCK_RATE_2MB;
 164         case B43legacy_CCK_RATE_11MB:
 165                 return B43legacy_CCK_RATE_5MB;
 166         case B43legacy_OFDM_RATE_6MB:
 167                 return B43legacy_CCK_RATE_5MB;
 168         case B43legacy_OFDM_RATE_9MB:
 169                 return B43legacy_OFDM_RATE_6MB;
 170         case B43legacy_OFDM_RATE_12MB:
 171                 return B43legacy_OFDM_RATE_9MB;
 172         case B43legacy_OFDM_RATE_18MB:
 173                 return B43legacy_OFDM_RATE_12MB;
 174         case B43legacy_OFDM_RATE_24MB:
 175                 return B43legacy_OFDM_RATE_18MB;
 176         case B43legacy_OFDM_RATE_36MB:
 177                 return B43legacy_OFDM_RATE_24MB;
 178         case B43legacy_OFDM_RATE_48MB:
 179                 return B43legacy_OFDM_RATE_36MB;
 180         case B43legacy_OFDM_RATE_54MB:
 181                 return B43legacy_OFDM_RATE_48MB;
 182         }
 183         B43legacy_BUG_ON(1);
 184         return 0;
 185 }
 186
 187 static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
 188                                struct b43legacy_txhdr_fw3 *txhdr,
 189                                const unsigned char *fragment_data,
 190                                unsigned int fragment_len,
 191                                struct ieee80211_tx_info *info,
 192                                u16 cookie)
 193 {
 194         const struct ieee80211_hdr *wlhdr;
 195         int use_encryption = !!info->control.hw_key;
 196         u8 rate;
 197         struct ieee80211_rate *rate_fb;
 198         int rate_ofdm;
 199         int rate_fb_ofdm;
 200         unsigned int plcp_fragment_len;
 201         u32 mac_ctl = 0;
 202         u16 phy_ctl = 0;
 203         struct ieee80211_rate *tx_rate;
 204         struct ieee80211_tx_rate *rates;
 205
 206         wlhdr = (const struct ieee80211_hdr *)fragment_data;
 207
 208         memset(txhdr, 0, sizeof(*txhdr));
 209
 210         tx_rate = ieee80211_get_tx_rate(dev->wl->hw, info);
 211
 212         rate = tx_rate->hw_value;
 213         rate_ofdm = b43legacy_is_ofdm_rate(rate);
 214         rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : tx_rate;
 215         rate_fb_ofdm = b43legacy_is_ofdm_rate(rate_fb->hw_value);
 216
 217         txhdr->mac_frame_ctl = wlhdr->frame_control;
 218         memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
 219
 220         /* Calculate duration for fallback rate */
 221         if ((rate_fb->hw_value == rate) ||
 222             (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
 223             (wlhdr->duration_id == cpu_to_le16(0))) {
 224                 /* If the fallback rate equals the normal rate or the
 225                  * dur_id field contains an AID, CFP magic or 0,
 226                  * use the original dur_id field. */
 227                 txhdr->dur_fb = wlhdr->duration_id;
 228         } else {
 229                 txhdr->dur_fb = ieee80211_generic_frame_duration(dev->wl->hw,
 230                                                          info->control.vif,
 231                                                          fragment_len,
 232                                                          rate_fb);
 233         }
 234
 235         plcp_fragment_len = fragment_len + FCS_LEN;
 236         if (use_encryption) {
 237                 u8 key_idx = info->control.hw_key->hw_key_idx;
 238                 struct b43legacy_key *key;
 239                 int wlhdr_len;
 240                 size_t iv_len;
 241
 242                 B43legacy_WARN_ON(key_idx >= dev->max_nr_keys);
 243                 key = &(dev->key[key_idx]);
 244
 245                 if (key->enabled) {
 246                         /* Hardware appends ICV. */
 247                         plcp_fragment_len += info->control.hw_key->icv_len;
 248
 249                         key_idx = b43legacy_kidx_to_fw(dev, key_idx);
 250                         mac_ctl |= (key_idx << B43legacy_TX4_MAC_KEYIDX_SHIFT) &
 251                                    B43legacy_TX4_MAC_KEYIDX;
 252                         mac_ctl |= (key->algorithm <<
 253                                    B43legacy_TX4_MAC_KEYALG_SHIFT) &
 254                                    B43legacy_TX4_MAC_KEYALG;
 255                         wlhdr_len = ieee80211_hdrlen(wlhdr->frame_control);
 256                         iv_len = min((size_t)info->control.hw_key->iv_len,
 257                                      ARRAY_SIZE(txhdr->iv));
 258                         memcpy(txhdr->iv, ((u8 *)wlhdr) + wlhdr_len, iv_len);
 259                 } else {
 260                         /* This key is invalid. This might only happen
 261                          * in a short timeframe after machine resume before
 262                          * we were able to reconfigure keys.
 263                          * Drop this packet completely. Do not transmit it
 264                          * unencrypted to avoid leaking information. */
 265                         return -ENOKEY;
 266                 }
 267         }
 268         b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 269                                     (&txhdr->plcp), plcp_fragment_len,
 270                                     rate);
 271         b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 272                                     (&txhdr->plcp_fb), plcp_fragment_len,
 273                                     rate_fb->hw_value);
 274
 275         /* PHY TX Control word */
 276         if (rate_ofdm)
 277                 phy_ctl |= B43legacy_TX4_PHY_ENC_OFDM;
 278         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 279                 phy_ctl |= B43legacy_TX4_PHY_SHORTPRMBL;
 280         switch (info->antenna_sel_tx) {
 281         case 0:
 282                 phy_ctl |= B43legacy_TX4_PHY_ANTLAST;
 283                 break;
 284         case 1:
 285                 phy_ctl |= B43legacy_TX4_PHY_ANT0;
 286                 break;
 287         case 2:
 288                 phy_ctl |= B43legacy_TX4_PHY_ANT1;
 289                 break;
 290         default:
 291                 B43legacy_BUG_ON(1);
 292         }
 293
 294         /* MAC control */
 295         rates = info->control.rates;
 296         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 297                 mac_ctl |= B43legacy_TX4_MAC_ACK;
 298         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 299                 mac_ctl |= B43legacy_TX4_MAC_HWSEQ;
 300         if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
 301                 mac_ctl |= B43legacy_TX4_MAC_STMSDU;
 302         if (rate_fb_ofdm)
 303                 mac_ctl |= B43legacy_TX4_MAC_FALLBACKOFDM;
 304
 305         /* Overwrite rates[0].count to make the retry calculation
 306          * in the tx status easier. need the actual retry limit to
 307          * detect whether the fallback rate was used.
 308          */
 309         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 310             (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
 311                 rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
 312                 mac_ctl |= B43legacy_TX4_MAC_LONGFRAME;
 313         } else {
 314                 rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
 315         }
 316
 317         /* Generate the RTS or CTS-to-self frame */
 318         if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 319             (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
 320                 unsigned int len;
 321                 struct ieee80211_hdr *hdr;
 322                 int rts_rate;
 323                 int rts_rate_fb;
 324                 int rts_rate_ofdm;
 325                 int rts_rate_fb_ofdm;
 326
 327                 rts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info)->hw_value;
 328                 rts_rate_ofdm = b43legacy_is_ofdm_rate(rts_rate);
 329                 rts_rate_fb = b43legacy_calc_fallback_rate(rts_rate);
 330                 rts_rate_fb_ofdm = b43legacy_is_ofdm_rate(rts_rate_fb);
 331                 if (rts_rate_fb_ofdm)
 332                         mac_ctl |= B43legacy_TX4_MAC_CTSFALLBACKOFDM;
 333
 334                 if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 335                         ieee80211_ctstoself_get(dev->wl->hw,
 336                                                 info->control.vif,
 337                                                 fragment_data,
 338                                                 fragment_len, info,
 339                                                 (struct ieee80211_cts *)
 340                                                 (txhdr->rts_frame));
 341                         mac_ctl |= B43legacy_TX4_MAC_SENDCTS;
 342                         len = sizeof(struct ieee80211_cts);
 343                 } else {
 344                         ieee80211_rts_get(dev->wl->hw,
 345                                           info->control.vif,
 346                                           fragment_data, fragment_len, info,
 347                                           (struct ieee80211_rts *)
 348                                           (txhdr->rts_frame));
 349                         mac_ctl |= B43legacy_TX4_MAC_SENDRTS;
 350                         len = sizeof(struct ieee80211_rts);
 351                 }
 352                 len += FCS_LEN;
 353                 b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 354                                             (&txhdr->rts_plcp),
 355                                             len, rts_rate);
 356                 b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
 357                                             (&txhdr->rts_plcp_fb),
 358                                             len, rts_rate_fb);
 359                 hdr = (struct ieee80211_hdr *)(&txhdr->rts_frame);
 360                 txhdr->rts_dur_fb = hdr->duration_id;
 361         }
 362
 363         /* Magic cookie */
 364         txhdr->cookie = cpu_to_le16(cookie);
 365
 366         /* Apply the bitfields */
 367         txhdr->mac_ctl = cpu_to_le32(mac_ctl);
 368         txhdr->phy_ctl = cpu_to_le16(phy_ctl);
 369
 370         return 0;
 371 }
 372
 373 int b43legacy_generate_txhdr(struct b43legacy_wldev *dev,
 374                               u8 *txhdr,
 375                               const unsigned char *fragment_data,
 376                               unsigned int fragment_len,
 377                               struct ieee80211_tx_info *info,
 378                               u16 cookie)
 379 {
 380         return generate_txhdr_fw3(dev, (struct b43legacy_txhdr_fw3 *)txhdr,
 381                            fragment_data, fragment_len,
 382                            info, cookie);
 383 }
 384
 385 static s8 b43legacy_rssi_postprocess(struct b43legacy_wldev *dev,
 386                                      u8 in_rssi, int ofdm,
 387                                      int adjust_2053, int adjust_2050)
 388 {
 389         struct b43legacy_phy *phy = &dev->phy;
 390         s32 tmp;
 391
 392         switch (phy->radio_ver) {
 393         case 0x2050:
 394                 if (ofdm) {
 395                         tmp = in_rssi;
 396                         if (tmp > 127)
 397                                 tmp -= 256;
 398                         tmp *= 73;
 399                         tmp /= 64;
 400                         if (adjust_2050)
 401                                 tmp += 25;
 402                         else
 403                                 tmp -= 3;
 404                 } else {
 405                         if (dev->dev->bus->sprom.boardflags_lo
 406                             & B43legacy_BFL_RSSI) {
 407                                 if (in_rssi > 63)
 408                                         in_rssi = 63;
 409                                 tmp = phy->nrssi_lt[in_rssi];
 410                                 tmp = 31 - tmp;
 411                                 tmp *= -131;
 412                                 tmp /= 128;
 413                                 tmp -= 57;
 414                         } else {
 415                                 tmp = in_rssi;
 416                                 tmp = 31 - tmp;
 417                                 tmp *= -149;
 418                                 tmp /= 128;
 419                                 tmp -= 68;
 420                         }
 421                         if (phy->type == B43legacy_PHYTYPE_G &&
 422                             adjust_2050)
 423                                 tmp += 25;
 424                 }
 425                 break;
 426         case 0x2060:
 427                 if (in_rssi > 127)
 428                         tmp = in_rssi - 256;
 429                 else
 430                         tmp = in_rssi;
 431                 break;
 432         default:
 433                 tmp = in_rssi;
 434                 tmp -= 11;
 435                 tmp *= 103;
 436                 tmp /= 64;
 437                 if (adjust_2053)
 438                         tmp -= 109;
 439                 else
 440                         tmp -= 83;
 441         }
 442
 443         return (s8)tmp;
 444 }
 445
 446 void b43legacy_rx(struct b43legacy_wldev *dev,
 447                   struct sk_buff *skb,
 448                   const void *_rxhdr)
 449 {
 450         struct ieee80211_rx_status status;
 451         struct b43legacy_plcp_hdr6 *plcp;
 452         struct ieee80211_hdr *wlhdr;
 453         const struct b43legacy_rxhdr_fw3 *rxhdr = _rxhdr;
 454         __le16 fctl;
 455         u16 phystat0;
 456         u16 phystat3;
 457         u16 chanstat;
 458         u16 mactime;
 459         u32 macstat;
 460         u16 chanid;
 461         u8 jssi;
 462         int padding;
 463
 464         memset(&status, 0, sizeof(status));
 465
 466         /* Get metadata about the frame from the header. */
 467         phystat0 = le16_to_cpu(rxhdr->phy_status0);
 468         phystat3 = le16_to_cpu(rxhdr->phy_status3);
 469         jssi = rxhdr->jssi;
 470         macstat = le16_to_cpu(rxhdr->mac_status);
 471         mactime = le16_to_cpu(rxhdr->mac_time);
 472         chanstat = le16_to_cpu(rxhdr->channel);
 473
 474         if (macstat & B43legacy_RX_MAC_FCSERR)
 475                 dev->wl->ieee_stats.dot11FCSErrorCount++;
 476
 477         /* Skip PLCP and padding */
 478         padding = (macstat & B43legacy_RX_MAC_PADDING) ? 2 : 0;
 479         if (unlikely(skb->len < (sizeof(struct b43legacy_plcp_hdr6) +
 480             padding))) {
 481                 b43legacydbg(dev->wl, "RX: Packet size underrun (1)\n");
 482                 goto drop;
 483         }
 484         plcp = (struct b43legacy_plcp_hdr6 *)(skb->data + padding);
 485         skb_pull(skb, sizeof(struct b43legacy_plcp_hdr6) + padding);
 486         /* The skb contains the Wireless Header + payload data now */
 487         if (unlikely(skb->len < (2+2+6/*minimum hdr*/ + FCS_LEN))) {
 488                 b43legacydbg(dev->wl, "RX: Packet size underrun (2)\n");
 489                 goto drop;
 490         }
 491         wlhdr = (struct ieee80211_hdr *)(skb->data);
 492         fctl = wlhdr->frame_control;
 493
 494         if ((macstat & B43legacy_RX_MAC_DEC) &&
 495             !(macstat & B43legacy_RX_MAC_DECERR)) {
 496                 unsigned int keyidx;
 497                 int wlhdr_len;
 498                 int iv_len;
 499                 int icv_len;
 500
 501                 keyidx = ((macstat & B43legacy_RX_MAC_KEYIDX)
 502                           >> B43legacy_RX_MAC_KEYIDX_SHIFT);
 503                 /* We must adjust the key index here. We want the "physical"
 504                  * key index, but the ucode passed it slightly different.
 505                  */
 506                 keyidx = b43legacy_kidx_to_raw(dev, keyidx);
 507                 B43legacy_WARN_ON(keyidx >= dev->max_nr_keys);
 508
 509                 if (dev->key[keyidx].algorithm != B43legacy_SEC_ALGO_NONE) {
 510                         /* Remove PROTECTED flag to mark it as decrypted. */
 511                         B43legacy_WARN_ON(!ieee80211_has_protected(fctl));
 512                         fctl &= ~cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 513                         wlhdr->frame_control = fctl;
 514
 515                         wlhdr_len = ieee80211_hdrlen(fctl);
 516                         if (unlikely(skb->len < (wlhdr_len + 3))) {
 517                                 b43legacydbg(dev->wl, "RX: Packet size"
 518                                              " underrun3\n");
 519                                 goto drop;
 520                         }
 521                         if (skb->data[wlhdr_len + 3] & (1 << 5)) {
 522                                 /* The Ext-IV Bit is set in the "KeyID"
 523                                  * octet of the IV.
 524                                  */
 525                                 iv_len = 8;
 526                                 icv_len = 8;
 527                         } else {
 528                                 iv_len = 4;
 529                                 icv_len = 4;
 530                         }
 531                         if (unlikely(skb->len < (wlhdr_len + iv_len +
 532                             icv_len))) {
 533                                 b43legacydbg(dev->wl, "RX: Packet size"
 534                                              " underrun4\n");
 535                                 goto drop;
 536                         }
 537                         /* Remove the IV */
 538                         memmove(skb->data + iv_len, skb->data, wlhdr_len);
 539                         skb_pull(skb, iv_len);
 540                         /* Remove the ICV */
 541                         skb_trim(skb, skb->len - icv_len);
 542
 543                         status.flag |= RX_FLAG_DECRYPTED;
 544                 }
 545         }
 546
 547         status.signal = b43legacy_rssi_postprocess(dev, jssi,
 548                                       (phystat0 & B43legacy_RX_PHYST0_OFDM),
 549                                       (phystat0 & B43legacy_RX_PHYST0_GAINCTL),
 550                                       (phystat3 & B43legacy_RX_PHYST3_TRSTATE));
 551         /* change to support A PHY */
 552         if (phystat0 & B43legacy_RX_PHYST0_OFDM)
 553                 status.rate_idx = b43legacy_plcp_get_bitrate_idx_ofdm(plcp, false);
 554         else
 555                 status.rate_idx = b43legacy_plcp_get_bitrate_idx_cck(plcp);
 556         status.antenna = !!(phystat0 & B43legacy_RX_PHYST0_ANT);
 557
 558         /*
 559          * All frames on monitor interfaces and beacons always need a full
 560          * 64-bit timestamp. Monitor interfaces need it for diagnostic
 561          * purposes and beacons for IBSS merging.
 562          * This code assumes we get to process the packet within 16 bits
 563          * of timestamp, i.e. about 65 milliseconds after the PHY received
 564          * the first symbol.
 565          */
 566         if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
 567                 u16 low_mactime_now;
 568
 569                 b43legacy_tsf_read(dev, &status.mactime);
 570                 low_mactime_now = status.mactime;
 571                 status.mactime = status.mactime & ~0xFFFFULL;
 572                 status.mactime += mactime;
 573                 if (low_mactime_now <= mactime)
 574                         status.mactime -= 0x10000;
 575                 status.flag |= RX_FLAG_MACTIME_MPDU;
 576         }
 577
 578         chanid = (chanstat & B43legacy_RX_CHAN_ID) >>
 579                   B43legacy_RX_CHAN_ID_SHIFT;
 580         switch (chanstat & B43legacy_RX_CHAN_PHYTYPE) {
 581         case B43legacy_PHYTYPE_B:
 582         case B43legacy_PHYTYPE_G:
 583                 status.band = IEEE80211_BAND_2GHZ;
 584                 status.freq = chanid + 2400;
 585                 break;
 586         default:
 587                 b43legacywarn(dev->wl, "Unexpected value for chanstat (0x%X)\n",
 588                        chanstat);
 589         }
 590
 591         memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
 592         ieee80211_rx_irqsafe(dev->wl->hw, skb);
 593
 594         return;
 595 drop:
 596         b43legacydbg(dev->wl, "RX: Packet dropped\n");
 597         dev_kfree_skb_any(skb);
 598 }
 599
 600 void b43legacy_handle_txstatus(struct b43legacy_wldev *dev,
 601                              const struct b43legacy_txstatus *status)
 602 {
 603         b43legacy_debugfs_log_txstat(dev, status);
 604
 605         if (status->intermediate)
 606                 return;
 607         if (status->for_ampdu)
 608                 return;
 609         if (!status->acked)
 610                 dev->wl->ieee_stats.dot11ACKFailureCount++;
 611         if (status->rts_count) {
 612                 if (status->rts_count == 0xF) /* FIXME */
 613                         dev->wl->ieee_stats.dot11RTSFailureCount++;
 614                 else
 615                         dev->wl->ieee_stats.dot11RTSSuccessCount++;
 616         }
 617
 618         if (b43legacy_using_pio(dev))
 619                 b43legacy_pio_handle_txstatus(dev, status);
 620         else
 621                 b43legacy_dma_handle_txstatus(dev, status);
 622 }
 623
 624 /* Handle TX status report as received through DMA/PIO queues */
 625 void b43legacy_handle_hwtxstatus(struct b43legacy_wldev *dev,
 626                                  const struct b43legacy_hwtxstatus *hw)
 627 {
 628         struct b43legacy_txstatus status;
 629         u8 tmp;
 630
 631         status.cookie = le16_to_cpu(hw->cookie);
 632         status.seq = le16_to_cpu(hw->seq);
 633         status.phy_stat = hw->phy_stat;
 634         tmp = hw->count;
 635         status.frame_count = (tmp >> 4);
 636         status.rts_count = (tmp & 0x0F);
 637         tmp = hw->flags << 1;
 638         status.supp_reason = ((tmp & 0x1C) >> 2);
 639         status.pm_indicated = !!(tmp & 0x80);
 640         status.intermediate = !!(tmp & 0x40);
 641         status.for_ampdu = !!(tmp & 0x20);
 642         status.acked = !!(tmp & 0x02);
 643
 644         b43legacy_handle_txstatus(dev, &status);
 645 }
 646
 647 /* Stop any TX operation on the device (suspend the hardware queues) */
 648 void b43legacy_tx_suspend(struct b43legacy_wldev *dev)
 649 {
 650         if (b43legacy_using_pio(dev))
 651                 b43legacy_pio_freeze_txqueues(dev);
 652         else
 653                 b43legacy_dma_tx_suspend(dev);
 654 }
 655
 656 /* Resume any TX operation on the device (resume the hardware queues) */
 657 void b43legacy_tx_resume(struct b43legacy_wldev *dev)
 658 {
 659         if (b43legacy_using_pio(dev))
 660                 b43legacy_pio_thaw_txqueues(dev);
 661         else
 662                 b43legacy_dma_tx_resume(dev);
 663 }
 664
 665 /* Initialize the QoS parameters */
 666 void b43legacy_qos_init(struct b43legacy_wldev *dev)
 667 {
 668         /* FIXME: This function must probably be called from the mac80211
 669          * config callback. */
 670 return;
 671
 672         b43legacy_hf_write(dev, b43legacy_hf_read(dev) | B43legacy_HF_EDCF);
 673         /* FIXME kill magic */
 674         b43legacy_write16(dev, 0x688,
 675                           b43legacy_read16(dev, 0x688) | 0x4);
 676
 677
 678         /*TODO: We might need some stack support here to get the values. */
 679 }