xmit.c revision 523b02ea23b175dd3e46e3daf1bc9354376640a3
1/* 2 3 Broadcom B43 wireless driver 4 5 Transmission (TX/RX) related functions. 6 7 Copyright (C) 2005 Martin Langer <martin-langer@gmx.de> 8 Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it> 9 Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de> 10 Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org> 11 Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; see the file COPYING. If not, write to 25 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, 26 Boston, MA 02110-1301, USA. 27 28*/ 29 30#include "xmit.h" 31#include "phy_common.h" 32#include "dma.h" 33#include "pio.h" 34 35static 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 50static const struct b43_tx_legacy_rate_phy_ctl_entry * 51b43_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. */ 67static 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. */ 83static 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 108u8 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 124u8 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 148void 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 178static 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 206static 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. */ 239int 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 if (b43_is_old_txhdr_format(dev)) { 341 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp), 342 plcp_fragment_len, rate); 343 } else { 344 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp), 345 plcp_fragment_len, rate); 346 } 347 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb), 348 plcp_fragment_len, rate_fb); 349 350 /* Extra Frame Types */ 351 if (rate_fb_ofdm) 352 extra_ft |= B43_TXH_EFT_FB_OFDM; 353 else 354 extra_ft |= B43_TXH_EFT_FB_CCK; 355 356 /* Set channel radio code. Note that the micrcode ORs 0x100 to 357 * this value before comparing it to the value in SHM, if this 358 * is a 5Ghz packet. 359 */ 360 txhdr->chan_radio_code = phy->channel; 361 362 /* PHY TX Control word */ 363 if (rate_ofdm) 364 phy_ctl |= B43_TXH_PHY_ENC_OFDM; 365 else 366 phy_ctl |= B43_TXH_PHY_ENC_CCK; 367 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) 368 phy_ctl |= B43_TXH_PHY_SHORTPRMBL; 369 370 switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) { 371 case 0: /* Default */ 372 phy_ctl |= B43_TXH_PHY_ANT01AUTO; 373 break; 374 case 1: /* Antenna 0 */ 375 phy_ctl |= B43_TXH_PHY_ANT0; 376 break; 377 case 2: /* Antenna 1 */ 378 phy_ctl |= B43_TXH_PHY_ANT1; 379 break; 380 case 3: /* Antenna 2 */ 381 phy_ctl |= B43_TXH_PHY_ANT2; 382 break; 383 case 4: /* Antenna 3 */ 384 phy_ctl |= B43_TXH_PHY_ANT3; 385 break; 386 default: 387 B43_WARN_ON(1); 388 } 389 390 rates = info->control.rates; 391 /* MAC control */ 392 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) 393 mac_ctl |= B43_TXH_MAC_ACK; 394 /* use hardware sequence counter as the non-TID counter */ 395 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) 396 mac_ctl |= B43_TXH_MAC_HWSEQ; 397 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) 398 mac_ctl |= B43_TXH_MAC_STMSDU; 399 if (phy->type == B43_PHYTYPE_A) 400 mac_ctl |= B43_TXH_MAC_5GHZ; 401 402 /* Overwrite rates[0].count to make the retry calculation 403 * in the tx status easier. need the actual retry limit to 404 * detect whether the fallback rate was used. 405 */ 406 if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 407 (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) { 408 rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count; 409 mac_ctl |= B43_TXH_MAC_LONGFRAME; 410 } else { 411 rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count; 412 } 413 414 /* Generate the RTS or CTS-to-self frame */ 415 if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 416 (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) { 417 unsigned int len; 418 struct ieee80211_hdr *hdr; 419 int rts_rate, rts_rate_fb; 420 int rts_rate_ofdm, rts_rate_fb_ofdm; 421 struct b43_plcp_hdr6 *plcp; 422 struct ieee80211_rate *rts_cts_rate; 423 424 rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info); 425 426 rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB; 427 rts_rate_ofdm = b43_is_ofdm_rate(rts_rate); 428 rts_rate_fb = b43_calc_fallback_rate(rts_rate); 429 rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb); 430 431 if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) { 432 struct ieee80211_cts *cts; 433 434 if (b43_is_old_txhdr_format(dev)) { 435 cts = (struct ieee80211_cts *) 436 (txhdr->old_format.rts_frame); 437 } else { 438 cts = (struct ieee80211_cts *) 439 (txhdr->new_format.rts_frame); 440 } 441 ieee80211_ctstoself_get(dev->wl->hw, info->control.vif, 442 fragment_data, fragment_len, 443 info, cts); 444 mac_ctl |= B43_TXH_MAC_SENDCTS; 445 len = sizeof(struct ieee80211_cts); 446 } else { 447 struct ieee80211_rts *rts; 448 449 if (b43_is_old_txhdr_format(dev)) { 450 rts = (struct ieee80211_rts *) 451 (txhdr->old_format.rts_frame); 452 } else { 453 rts = (struct ieee80211_rts *) 454 (txhdr->new_format.rts_frame); 455 } 456 ieee80211_rts_get(dev->wl->hw, info->control.vif, 457 fragment_data, fragment_len, 458 info, rts); 459 mac_ctl |= B43_TXH_MAC_SENDRTS; 460 len = sizeof(struct ieee80211_rts); 461 } 462 len += FCS_LEN; 463 464 /* Generate the PLCP headers for the RTS/CTS frame */ 465 if (b43_is_old_txhdr_format(dev)) 466 plcp = &txhdr->old_format.rts_plcp; 467 else 468 plcp = &txhdr->new_format.rts_plcp; 469 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp, 470 len, rts_rate); 471 plcp = &txhdr->rts_plcp_fb; 472 b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp, 473 len, rts_rate_fb); 474 475 if (b43_is_old_txhdr_format(dev)) { 476 hdr = (struct ieee80211_hdr *) 477 (&txhdr->old_format.rts_frame); 478 } else { 479 hdr = (struct ieee80211_hdr *) 480 (&txhdr->new_format.rts_frame); 481 } 482 txhdr->rts_dur_fb = hdr->duration_id; 483 484 if (rts_rate_ofdm) { 485 extra_ft |= B43_TXH_EFT_RTS_OFDM; 486 txhdr->phy_rate_rts = 487 b43_plcp_get_ratecode_ofdm(rts_rate); 488 } else { 489 extra_ft |= B43_TXH_EFT_RTS_CCK; 490 txhdr->phy_rate_rts = 491 b43_plcp_get_ratecode_cck(rts_rate); 492 } 493 if (rts_rate_fb_ofdm) 494 extra_ft |= B43_TXH_EFT_RTSFB_OFDM; 495 else 496 extra_ft |= B43_TXH_EFT_RTSFB_CCK; 497 498 if (rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS && 499 phy->type == B43_PHYTYPE_N) { 500 txhdr->phy_ctl1_rts = cpu_to_le16( 501 b43_generate_tx_phy_ctl1(dev, rts_rate)); 502 txhdr->phy_ctl1_rts_fb = cpu_to_le16( 503 b43_generate_tx_phy_ctl1(dev, rts_rate_fb)); 504 } 505 } 506 507 /* Magic cookie */ 508 if (b43_is_old_txhdr_format(dev)) 509 txhdr->old_format.cookie = cpu_to_le16(cookie); 510 else 511 txhdr->new_format.cookie = cpu_to_le16(cookie); 512 513 if (phy->type == B43_PHYTYPE_N) { 514 txhdr->phy_ctl1 = 515 cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate)); 516 txhdr->phy_ctl1_fb = 517 cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate_fb)); 518 } 519 520 /* Apply the bitfields */ 521 txhdr->mac_ctl = cpu_to_le32(mac_ctl); 522 txhdr->phy_ctl = cpu_to_le16(phy_ctl); 523 txhdr->extra_ft = extra_ft; 524 525 return 0; 526} 527 528static s8 b43_rssi_postprocess(struct b43_wldev *dev, 529 u8 in_rssi, int ofdm, 530 int adjust_2053, int adjust_2050) 531{ 532 struct b43_phy *phy = &dev->phy; 533 struct b43_phy_g *gphy = phy->g; 534 s32 tmp; 535 536 switch (phy->radio_ver) { 537 case 0x2050: 538 if (ofdm) { 539 tmp = in_rssi; 540 if (tmp > 127) 541 tmp -= 256; 542 tmp *= 73; 543 tmp /= 64; 544 if (adjust_2050) 545 tmp += 25; 546 else 547 tmp -= 3; 548 } else { 549 if (dev->dev->bus_sprom-> 550 boardflags_lo & B43_BFL_RSSI) { 551 if (in_rssi > 63) 552 in_rssi = 63; 553 B43_WARN_ON(phy->type != B43_PHYTYPE_G); 554 tmp = gphy->nrssi_lt[in_rssi]; 555 tmp = 31 - tmp; 556 tmp *= -131; 557 tmp /= 128; 558 tmp -= 57; 559 } else { 560 tmp = in_rssi; 561 tmp = 31 - tmp; 562 tmp *= -149; 563 tmp /= 128; 564 tmp -= 68; 565 } 566 if (phy->type == B43_PHYTYPE_G && adjust_2050) 567 tmp += 25; 568 } 569 break; 570 case 0x2060: 571 if (in_rssi > 127) 572 tmp = in_rssi - 256; 573 else 574 tmp = in_rssi; 575 break; 576 default: 577 tmp = in_rssi; 578 tmp -= 11; 579 tmp *= 103; 580 tmp /= 64; 581 if (adjust_2053) 582 tmp -= 109; 583 else 584 tmp -= 83; 585 } 586 587 return (s8) tmp; 588} 589 590//TODO 591#if 0 592static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi) 593{ 594 struct b43_phy *phy = &dev->phy; 595 s8 ret; 596 597 if (phy->type == B43_PHYTYPE_A) { 598 //TODO: Incomplete specs. 599 ret = 0; 600 } else 601 ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1); 602 603 return ret; 604} 605#endif 606 607void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr) 608{ 609 struct ieee80211_rx_status status; 610 struct b43_plcp_hdr6 *plcp; 611 struct ieee80211_hdr *wlhdr; 612 const struct b43_rxhdr_fw4 *rxhdr = _rxhdr; 613 __le16 fctl; 614 u16 phystat0, phystat3, chanstat, mactime; 615 u32 macstat; 616 u16 chanid; 617 u16 phytype; 618 int padding; 619 620 memset(&status, 0, sizeof(status)); 621 622 /* Get metadata about the frame from the header. */ 623 phystat0 = le16_to_cpu(rxhdr->phy_status0); 624 phystat3 = le16_to_cpu(rxhdr->phy_status3); 625 macstat = le32_to_cpu(rxhdr->mac_status); 626 mactime = le16_to_cpu(rxhdr->mac_time); 627 chanstat = le16_to_cpu(rxhdr->channel); 628 phytype = chanstat & B43_RX_CHAN_PHYTYPE; 629 630 if (unlikely(macstat & B43_RX_MAC_FCSERR)) { 631 dev->wl->ieee_stats.dot11FCSErrorCount++; 632 status.flag |= RX_FLAG_FAILED_FCS_CRC; 633 } 634 if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV))) 635 status.flag |= RX_FLAG_FAILED_PLCP_CRC; 636 if (phystat0 & B43_RX_PHYST0_SHORTPRMBL) 637 status.flag |= RX_FLAG_SHORTPRE; 638 if (macstat & B43_RX_MAC_DECERR) { 639 /* Decryption with the given key failed. 640 * Drop the packet. We also won't be able to decrypt it with 641 * the key in software. */ 642 goto drop; 643 } 644 645 /* Skip PLCP and padding */ 646 padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0; 647 if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) { 648 b43dbg(dev->wl, "RX: Packet size underrun (1)\n"); 649 goto drop; 650 } 651 plcp = (struct b43_plcp_hdr6 *)(skb->data + padding); 652 skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding); 653 /* The skb contains the Wireless Header + payload data now */ 654 if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */ + FCS_LEN))) { 655 b43dbg(dev->wl, "RX: Packet size underrun (2)\n"); 656 goto drop; 657 } 658 wlhdr = (struct ieee80211_hdr *)(skb->data); 659 fctl = wlhdr->frame_control; 660 661 if (macstat & B43_RX_MAC_DEC) { 662 unsigned int keyidx; 663 int wlhdr_len; 664 665 keyidx = ((macstat & B43_RX_MAC_KEYIDX) 666 >> B43_RX_MAC_KEYIDX_SHIFT); 667 /* We must adjust the key index here. We want the "physical" 668 * key index, but the ucode passed it slightly different. 669 */ 670 keyidx = b43_kidx_to_raw(dev, keyidx); 671 B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key)); 672 673 if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) { 674 wlhdr_len = ieee80211_hdrlen(fctl); 675 if (unlikely(skb->len < (wlhdr_len + 3))) { 676 b43dbg(dev->wl, 677 "RX: Packet size underrun (3)\n"); 678 goto drop; 679 } 680 status.flag |= RX_FLAG_DECRYPTED; 681 } 682 } 683 684 /* Link quality statistics */ 685 if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) { 686// s8 rssi = max(rxhdr->power0, rxhdr->power1); 687 //TODO: Find out what the rssi value is (dBm or percentage?) 688 // and also find out what the maximum possible value is. 689 // Fill status.ssi and status.signal fields. 690 } else { 691 status.signal = b43_rssi_postprocess(dev, rxhdr->jssi, 692 (phystat0 & B43_RX_PHYST0_OFDM), 693 (phystat0 & B43_RX_PHYST0_GAINCTL), 694 (phystat3 & B43_RX_PHYST3_TRSTATE)); 695 } 696 697 if (phystat0 & B43_RX_PHYST0_OFDM) 698 status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp, 699 phytype == B43_PHYTYPE_A); 700 else 701 status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp); 702 if (unlikely(status.rate_idx == -1)) { 703 /* PLCP seems to be corrupted. 704 * Drop the frame, if we are not interested in corrupted frames. */ 705 if (!(dev->wl->filter_flags & FIF_PLCPFAIL)) 706 goto drop; 707 } 708 status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT); 709 710 /* 711 * All frames on monitor interfaces and beacons always need a full 712 * 64-bit timestamp. Monitor interfaces need it for diagnostic 713 * purposes and beacons for IBSS merging. 714 * This code assumes we get to process the packet within 16 bits 715 * of timestamp, i.e. about 65 milliseconds after the PHY received 716 * the first symbol. 717 */ 718 if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) { 719 u16 low_mactime_now; 720 721 b43_tsf_read(dev, &status.mactime); 722 low_mactime_now = status.mactime; 723 status.mactime = status.mactime & ~0xFFFFULL; 724 status.mactime += mactime; 725 if (low_mactime_now <= mactime) 726 status.mactime -= 0x10000; 727 status.flag |= RX_FLAG_MACTIME_MPDU; 728 } 729 730 chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT; 731 switch (chanstat & B43_RX_CHAN_PHYTYPE) { 732 case B43_PHYTYPE_A: 733 status.band = IEEE80211_BAND_5GHZ; 734 B43_WARN_ON(1); 735 /* FIXME: We don't really know which value the "chanid" contains. 736 * So the following assignment might be wrong. */ 737 status.freq = b43_channel_to_freq_5ghz(chanid); 738 break; 739 case B43_PHYTYPE_G: 740 status.band = IEEE80211_BAND_2GHZ; 741 /* chanid is the radio channel cookie value as used 742 * to tune the radio. */ 743 status.freq = chanid + 2400; 744 break; 745 case B43_PHYTYPE_N: 746 case B43_PHYTYPE_LP: 747 /* chanid is the SHM channel cookie. Which is the plain 748 * channel number in b43. */ 749 if (chanstat & B43_RX_CHAN_5GHZ) { 750 status.band = IEEE80211_BAND_5GHZ; 751 status.freq = b43_freq_to_channel_5ghz(chanid); 752 } else { 753 status.band = IEEE80211_BAND_2GHZ; 754 status.freq = b43_freq_to_channel_2ghz(chanid); 755 } 756 break; 757 default: 758 B43_WARN_ON(1); 759 goto drop; 760 } 761 762 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); 763 ieee80211_rx_ni(dev->wl->hw, skb); 764 765#if B43_DEBUG 766 dev->rx_count++; 767#endif 768 return; 769drop: 770 b43dbg(dev->wl, "RX: Packet dropped\n"); 771 dev_kfree_skb_any(skb); 772} 773 774void b43_handle_txstatus(struct b43_wldev *dev, 775 const struct b43_txstatus *status) 776{ 777 b43_debugfs_log_txstat(dev, status); 778 779 if (status->intermediate) 780 return; 781 if (status->for_ampdu) 782 return; 783 if (!status->acked) 784 dev->wl->ieee_stats.dot11ACKFailureCount++; 785 if (status->rts_count) { 786 if (status->rts_count == 0xF) //FIXME 787 dev->wl->ieee_stats.dot11RTSFailureCount++; 788 else 789 dev->wl->ieee_stats.dot11RTSSuccessCount++; 790 } 791 792 if (b43_using_pio_transfers(dev)) 793 b43_pio_handle_txstatus(dev, status); 794 else 795 b43_dma_handle_txstatus(dev, status); 796 797 b43_phy_txpower_check(dev, 0); 798} 799 800/* Fill out the mac80211 TXstatus report based on the b43-specific 801 * txstatus report data. This returns a boolean whether the frame was 802 * successfully transmitted. */ 803bool b43_fill_txstatus_report(struct b43_wldev *dev, 804 struct ieee80211_tx_info *report, 805 const struct b43_txstatus *status) 806{ 807 bool frame_success = 1; 808 int retry_limit; 809 810 /* preserve the confiured retry limit before clearing the status 811 * The xmit function has overwritten the rc's value with the actual 812 * retry limit done by the hardware */ 813 retry_limit = report->status.rates[0].count; 814 ieee80211_tx_info_clear_status(report); 815 816 if (status->acked) { 817 /* The frame was ACKed. */ 818 report->flags |= IEEE80211_TX_STAT_ACK; 819 } else { 820 /* The frame was not ACKed... */ 821 if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) { 822 /* ...but we expected an ACK. */ 823 frame_success = 0; 824 } 825 } 826 if (status->frame_count == 0) { 827 /* The frame was not transmitted at all. */ 828 report->status.rates[0].count = 0; 829 } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { 830 /* 831 * If the short retries (RTS, not data frame) have exceeded 832 * the limit, the hw will not have tried the selected rate, 833 * but will have used the fallback rate instead. 834 * Don't let the rate control count attempts for the selected 835 * rate in this case, otherwise the statistics will be off. 836 */ 837 report->status.rates[0].count = 0; 838 report->status.rates[1].count = status->frame_count; 839 } else { 840 if (status->frame_count > retry_limit) { 841 report->status.rates[0].count = retry_limit; 842 report->status.rates[1].count = status->frame_count - 843 retry_limit; 844 845 } else { 846 report->status.rates[0].count = status->frame_count; 847 report->status.rates[1].idx = -1; 848 } 849 } 850 851 return frame_success; 852} 853 854/* Stop any TX operation on the device (suspend the hardware queues) */ 855void b43_tx_suspend(struct b43_wldev *dev) 856{ 857 if (b43_using_pio_transfers(dev)) 858 b43_pio_tx_suspend(dev); 859 else 860 b43_dma_tx_suspend(dev); 861} 862 863/* Resume any TX operation on the device (resume the hardware queues) */ 864void b43_tx_resume(struct b43_wldev *dev) 865{ 866 if (b43_using_pio_transfers(dev)) 867 b43_pio_tx_resume(dev); 868 else 869 b43_dma_tx_resume(dev); 870} 871