diff options
Diffstat (limited to 'drivers/net/wireless/broadcom/b43/xmit.c')
| -rw-r--r-- | drivers/net/wireless/broadcom/b43/xmit.c | 947 |
1 files changed, 947 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/b43/xmit.c b/drivers/net/wireless/broadcom/b43/xmit.c new file mode 100644 index 000000000000..426dc13c44cd --- /dev/null +++ b/drivers/net/wireless/broadcom/b43/xmit.c @@ -0,0 +1,947 @@ +/* + + Broadcom B43 wireless driver + + Transmission (TX/RX) related functions. + + Copyright (C) 2005 Martin Langer <martin-langer@gmx.de> + Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it> + Copyright (C) 2005, 2006 Michael Buesch <m@bues.ch> + Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org> + Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; see the file COPYING. If not, write to + the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, + Boston, MA 02110-1301, USA. + +*/ + +#include "xmit.h" +#include "phy_common.h" +#include "dma.h" +#include "pio.h" + +static const struct b43_tx_legacy_rate_phy_ctl_entry b43_tx_legacy_rate_phy_ctl[] = { + { B43_CCK_RATE_1MB, 0x0, 0x0 }, + { B43_CCK_RATE_2MB, 0x0, 0x1 }, + { B43_CCK_RATE_5MB, 0x0, 0x2 }, + { B43_CCK_RATE_11MB, 0x0, 0x3 }, + { B43_OFDM_RATE_6MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_BPSK }, + { B43_OFDM_RATE_9MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_BPSK }, + { B43_OFDM_RATE_12MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QPSK }, + { B43_OFDM_RATE_18MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QPSK }, + { B43_OFDM_RATE_24MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QAM16 }, + { B43_OFDM_RATE_36MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM16 }, + { B43_OFDM_RATE_48MB, B43_TXH_PHY1_CRATE_2_3, B43_TXH_PHY1_MODUL_QAM64 }, + { B43_OFDM_RATE_54MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM64 }, +}; + +static const struct b43_tx_legacy_rate_phy_ctl_entry * +b43_tx_legacy_rate_phy_ctl_ent(u8 bitrate) +{ + const struct b43_tx_legacy_rate_phy_ctl_entry *e; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(b43_tx_legacy_rate_phy_ctl); i++) { + e = &(b43_tx_legacy_rate_phy_ctl[i]); + if (e->bitrate == bitrate) + return e; + } + + B43_WARN_ON(1); + return NULL; +} + +/* Extract the bitrate index out of a CCK PLCP header. */ +static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp) +{ + switch (plcp->raw[0]) { + case 0x0A: + return 0; + case 0x14: + return 1; + case 0x37: + return 2; + case 0x6E: + return 3; + } + return -1; +} + +/* Extract the bitrate index out of an OFDM PLCP header. */ +static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool ghz5) +{ + /* For 2 GHz band first OFDM rate is at index 4, see main.c */ + int base = ghz5 ? 0 : 4; + + switch (plcp->raw[0] & 0xF) { + case 0xB: + return base + 0; + case 0xF: + return base + 1; + case 0xA: + return base + 2; + case 0xE: + return base + 3; + case 0x9: + return base + 4; + case 0xD: + return base + 5; + case 0x8: + return base + 6; + case 0xC: + return base + 7; + } + return -1; +} + +u8 b43_plcp_get_ratecode_cck(const u8 bitrate) +{ + switch (bitrate) { + case B43_CCK_RATE_1MB: + return 0x0A; + case B43_CCK_RATE_2MB: + return 0x14; + case B43_CCK_RATE_5MB: + return 0x37; + case B43_CCK_RATE_11MB: + return 0x6E; + } + B43_WARN_ON(1); + return 0; +} + +u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate) +{ + switch (bitrate) { + case B43_OFDM_RATE_6MB: + return 0xB; + case B43_OFDM_RATE_9MB: + return 0xF; + case B43_OFDM_RATE_12MB: + return 0xA; + case B43_OFDM_RATE_18MB: + return 0xE; + case B43_OFDM_RATE_24MB: + return 0x9; + case B43_OFDM_RATE_36MB: + return 0xD; + case B43_OFDM_RATE_48MB: + return 0x8; + case B43_OFDM_RATE_54MB: + return 0xC; + } + B43_WARN_ON(1); + return 0; +} + +void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp, + const u16 octets, const u8 bitrate) +{ + __u8 *raw = plcp->raw; + + if (b43_is_ofdm_rate(bitrate)) { + u32 d; + + d = b43_plcp_get_ratecode_ofdm(bitrate); + B43_WARN_ON(octets & 0xF000); + d |= (octets << 5); + plcp->data = cpu_to_le32(d); + } else { + u32 plen; + + plen = octets * 16 / bitrate; + if ((octets * 16 % bitrate) > 0) { + plen++; + if ((bitrate == B43_CCK_RATE_11MB) + && ((octets * 8 % 11) < 4)) { + raw[1] = 0x84; + } else + raw[1] = 0x04; + } else + raw[1] = 0x04; + plcp->data |= cpu_to_le32(plen << 16); + raw[0] = b43_plcp_get_ratecode_cck(bitrate); + } +} + +/* TODO: verify if needed for SSLPN or LCN */ +static u16 b43_generate_tx_phy_ctl1(struct b43_wldev *dev, u8 bitrate) +{ + const struct b43_phy *phy = &dev->phy; + const struct b43_tx_legacy_rate_phy_ctl_entry *e; + u16 control = 0; + u16 bw; + + if (phy->type == B43_PHYTYPE_LP) + bw = B43_TXH_PHY1_BW_20; + else /* FIXME */ + bw = B43_TXH_PHY1_BW_20; + + if (0) { /* FIXME: MIMO */ + } else if (b43_is_cck_rate(bitrate) && phy->type != B43_PHYTYPE_LP) { + control = bw; + } else { + control = bw; + e = b43_tx_legacy_rate_phy_ctl_ent(bitrate); + if (e) { + control |= e->coding_rate; + control |= e->modulation; + } + control |= B43_TXH_PHY1_MODE_SISO; + } + + return control; +} + +static u8 b43_calc_fallback_rate(u8 bitrate) +{ + switch (bitrate) { + case B43_CCK_RATE_1MB: + return B43_CCK_RATE_1MB; + case B43_CCK_RATE_2MB: + return B43_CCK_RATE_1MB; + case B43_CCK_RATE_5MB: + return B43_CCK_RATE_2MB; + case B43_CCK_RATE_11MB: + return B43_CCK_RATE_5MB; + case B43_OFDM_RATE_6MB: + return B43_CCK_RATE_5MB; + case B43_OFDM_RATE_9MB: + return B43_OFDM_RATE_6MB; + case B43_OFDM_RATE_12MB: + return B43_OFDM_RATE_9MB; + case B43_OFDM_RATE_18MB: + return B43_OFDM_RATE_12MB; + case B43_OFDM_RATE_24MB: + return B43_OFDM_RATE_18MB; + case B43_OFDM_RATE_36MB: + return B43_OFDM_RATE_24MB; + case B43_OFDM_RATE_48MB: + return B43_OFDM_RATE_36MB; + case B43_OFDM_RATE_54MB: + return B43_OFDM_RATE_48MB; + } + B43_WARN_ON(1); + return 0; +} + +/* Generate a TX data header. */ +int b43_generate_txhdr(struct b43_wldev *dev, + u8 *_txhdr, + struct sk_buff *skb_frag, + struct ieee80211_tx_info *info, + u16 cookie) +{ + const unsigned char *fragment_data = skb_frag->data; + unsigned int fragment_len = skb_frag->len; + struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr; + const struct b43_phy *phy = &dev->phy; + const struct ieee80211_hdr *wlhdr = + (const struct ieee80211_hdr *)fragment_data; + int use_encryption = !!info->control.hw_key; + __le16 fctl = wlhdr->frame_control; + struct ieee80211_rate *fbrate; + u8 rate, rate_fb; + int rate_ofdm, rate_fb_ofdm; + unsigned int plcp_fragment_len; + u32 mac_ctl = 0; + u16 phy_ctl = 0; + bool fill_phy_ctl1 = (phy->type == B43_PHYTYPE_LP || + phy->type == B43_PHYTYPE_N || + phy->type == B43_PHYTYPE_HT); + u8 extra_ft = 0; + struct ieee80211_rate *txrate; + struct ieee80211_tx_rate *rates; + + memset(txhdr, 0, sizeof(*txhdr)); + + txrate = ieee80211_get_tx_rate(dev->wl->hw, info); + rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB; + rate_ofdm = b43_is_ofdm_rate(rate); + fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate; + rate_fb = fbrate->hw_value; + rate_fb_ofdm = b43_is_ofdm_rate(rate_fb); + + if (rate_ofdm) + txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate); + else + txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate); + txhdr->mac_frame_ctl = wlhdr->frame_control; + memcpy(txhdr->tx_receiver, wlhdr->addr1, ETH_ALEN); + + /* Calculate duration for fallback rate */ + if ((rate_fb == rate) || + (wlhdr->duration_id & cpu_to_le16(0x8000)) || + (wlhdr->duration_id == cpu_to_le16(0))) { + /* If the fallback rate equals the normal rate or the + * dur_id field contains an AID, CFP magic or 0, + * use the original dur_id field. */ + txhdr->dur_fb = wlhdr->duration_id; + } else { + txhdr->dur_fb = ieee80211_generic_frame_duration( + dev->wl->hw, info->control.vif, info->band, + fragment_len, fbrate); + } + + plcp_fragment_len = fragment_len + FCS_LEN; + if (use_encryption) { + u8 key_idx = info->control.hw_key->hw_key_idx; + struct b43_key *key; + int wlhdr_len; + size_t iv_len; + + B43_WARN_ON(key_idx >= ARRAY_SIZE(dev->key)); + key = &(dev->key[key_idx]); + + if (unlikely(!key->keyconf)) { + /* This key is invalid. This might only happen + * in a short timeframe after machine resume before + * we were able to reconfigure keys. + * Drop this packet completely. Do not transmit it + * unencrypted to avoid leaking information. */ + return -ENOKEY; + } + + /* Hardware appends ICV. */ + plcp_fragment_len += info->control.hw_key->icv_len; + + key_idx = b43_kidx_to_fw(dev, key_idx); + mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) & + B43_TXH_MAC_KEYIDX; + mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) & + B43_TXH_MAC_KEYALG; + wlhdr_len = ieee80211_hdrlen(fctl); + if (key->algorithm == B43_SEC_ALGO_TKIP) { + u16 phase1key[5]; + int i; + /* we give the phase1key and iv16 here, the key is stored in + * shm. With that the hardware can do phase 2 and encryption. + */ + ieee80211_get_tkip_p1k(info->control.hw_key, skb_frag, phase1key); + /* phase1key is in host endian. Copy to little-endian txhdr->iv. */ + for (i = 0; i < 5; i++) { + txhdr->iv[i * 2 + 0] = phase1key[i]; + txhdr->iv[i * 2 + 1] = phase1key[i] >> 8; + } + /* iv16 */ + memcpy(txhdr->iv + 10, ((u8 *) wlhdr) + wlhdr_len, 3); + } else { + iv_len = min_t(size_t, info->control.hw_key->iv_len, + ARRAY_SIZE(txhdr->iv)); + memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len); + } + } + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_598.plcp), + plcp_fragment_len, rate); + break; + case B43_FW_HDR_351: + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_351.plcp), + plcp_fragment_len, rate); + break; + case B43_FW_HDR_410: + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->format_410.plcp), + plcp_fragment_len, rate); + break; + } + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb), + plcp_fragment_len, rate_fb); + + /* Extra Frame Types */ + if (rate_fb_ofdm) + extra_ft |= B43_TXH_EFT_FB_OFDM; + else + extra_ft |= B43_TXH_EFT_FB_CCK; + + /* Set channel radio code. Note that the micrcode ORs 0x100 to + * this value before comparing it to the value in SHM, if this + * is a 5Ghz packet. + */ + txhdr->chan_radio_code = phy->channel; + + /* PHY TX Control word */ + if (rate_ofdm) + phy_ctl |= B43_TXH_PHY_ENC_OFDM; + else + phy_ctl |= B43_TXH_PHY_ENC_CCK; + if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) + phy_ctl |= B43_TXH_PHY_SHORTPRMBL; + + switch (b43_ieee80211_antenna_sanitize(dev, 0)) { + case 0: /* Default */ + phy_ctl |= B43_TXH_PHY_ANT01AUTO; + break; + case 1: /* Antenna 0 */ + phy_ctl |= B43_TXH_PHY_ANT0; + break; + case 2: /* Antenna 1 */ + phy_ctl |= B43_TXH_PHY_ANT1; + break; + case 3: /* Antenna 2 */ + phy_ctl |= B43_TXH_PHY_ANT2; + break; + case 4: /* Antenna 3 */ + phy_ctl |= B43_TXH_PHY_ANT3; + break; + default: + B43_WARN_ON(1); + } + + rates = info->control.rates; + /* MAC control */ + if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) + mac_ctl |= B43_TXH_MAC_ACK; + /* use hardware sequence counter as the non-TID counter */ + if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) + mac_ctl |= B43_TXH_MAC_HWSEQ; + if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT) + mac_ctl |= B43_TXH_MAC_STMSDU; + if (!phy->gmode) + mac_ctl |= B43_TXH_MAC_5GHZ; + + /* Overwrite rates[0].count to make the retry calculation + * in the tx status easier. need the actual retry limit to + * detect whether the fallback rate was used. + */ + if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || + (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) { + rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count; + mac_ctl |= B43_TXH_MAC_LONGFRAME; + } else { + rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count; + } + + /* Generate the RTS or CTS-to-self frame */ + if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || + (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) { + unsigned int len; + struct ieee80211_hdr *uninitialized_var(hdr); + int rts_rate, rts_rate_fb; + int rts_rate_ofdm, rts_rate_fb_ofdm; + struct b43_plcp_hdr6 *uninitialized_var(plcp); + struct ieee80211_rate *rts_cts_rate; + + rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info); + + rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB; + rts_rate_ofdm = b43_is_ofdm_rate(rts_rate); + rts_rate_fb = b43_calc_fallback_rate(rts_rate); + rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb); + + if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) { + struct ieee80211_cts *uninitialized_var(cts); + + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + cts = (struct ieee80211_cts *) + (txhdr->format_598.rts_frame); + break; + case B43_FW_HDR_351: + cts = (struct ieee80211_cts *) + (txhdr->format_351.rts_frame); + break; + case B43_FW_HDR_410: + cts = (struct ieee80211_cts *) + (txhdr->format_410.rts_frame); + break; + } + ieee80211_ctstoself_get(dev->wl->hw, info->control.vif, + fragment_data, fragment_len, + info, cts); + mac_ctl |= B43_TXH_MAC_SENDCTS; + len = sizeof(struct ieee80211_cts); + } else { + struct ieee80211_rts *uninitialized_var(rts); + + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + rts = (struct ieee80211_rts *) + (txhdr->format_598.rts_frame); + break; + case B43_FW_HDR_351: + rts = (struct ieee80211_rts *) + (txhdr->format_351.rts_frame); + break; + case B43_FW_HDR_410: + rts = (struct ieee80211_rts *) + (txhdr->format_410.rts_frame); + break; + } + ieee80211_rts_get(dev->wl->hw, info->control.vif, + fragment_data, fragment_len, + info, rts); + mac_ctl |= B43_TXH_MAC_SENDRTS; + len = sizeof(struct ieee80211_rts); + } + len += FCS_LEN; + + /* Generate the PLCP headers for the RTS/CTS frame */ + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + plcp = &txhdr->format_598.rts_plcp; + break; + case B43_FW_HDR_351: + plcp = &txhdr->format_351.rts_plcp; + break; + case B43_FW_HDR_410: + plcp = &txhdr->format_410.rts_plcp; + break; + } + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp, + len, rts_rate); + plcp = &txhdr->rts_plcp_fb; + b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp, + len, rts_rate_fb); + + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + hdr = (struct ieee80211_hdr *) + (&txhdr->format_598.rts_frame); + break; + case B43_FW_HDR_351: + hdr = (struct ieee80211_hdr *) + (&txhdr->format_351.rts_frame); + break; + case B43_FW_HDR_410: + hdr = (struct ieee80211_hdr *) + (&txhdr->format_410.rts_frame); + break; + } + txhdr->rts_dur_fb = hdr->duration_id; + + if (rts_rate_ofdm) { + extra_ft |= B43_TXH_EFT_RTS_OFDM; + txhdr->phy_rate_rts = + b43_plcp_get_ratecode_ofdm(rts_rate); + } else { + extra_ft |= B43_TXH_EFT_RTS_CCK; + txhdr->phy_rate_rts = + b43_plcp_get_ratecode_cck(rts_rate); + } + if (rts_rate_fb_ofdm) + extra_ft |= B43_TXH_EFT_RTSFB_OFDM; + else + extra_ft |= B43_TXH_EFT_RTSFB_CCK; + + if (rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS && + fill_phy_ctl1) { + txhdr->phy_ctl1_rts = cpu_to_le16( + b43_generate_tx_phy_ctl1(dev, rts_rate)); + txhdr->phy_ctl1_rts_fb = cpu_to_le16( + b43_generate_tx_phy_ctl1(dev, rts_rate_fb)); + } + } + + /* Magic cookie */ + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + txhdr->format_598.cookie = cpu_to_le16(cookie); + break; + case B43_FW_HDR_351: + txhdr->format_351.cookie = cpu_to_le16(cookie); + break; + case B43_FW_HDR_410: + txhdr->format_410.cookie = cpu_to_le16(cookie); + break; + } + + if (fill_phy_ctl1) { + txhdr->phy_ctl1 = + cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate)); + txhdr->phy_ctl1_fb = + cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate_fb)); + } + + /* Apply the bitfields */ + txhdr->mac_ctl = cpu_to_le32(mac_ctl); + txhdr->phy_ctl = cpu_to_le16(phy_ctl); + txhdr->extra_ft = extra_ft; + + return 0; +} + +static s8 b43_rssi_postprocess(struct b43_wldev *dev, + u8 in_rssi, int ofdm, + int adjust_2053, int adjust_2050) +{ + struct b43_phy *phy = &dev->phy; + struct b43_phy_g *gphy = phy->g; + s32 tmp; + + switch (phy->radio_ver) { + case 0x2050: + if (ofdm) { + tmp = in_rssi; + if (tmp > 127) + tmp -= 256; + tmp *= 73; + tmp /= 64; + if (adjust_2050) + tmp += 25; + else + tmp -= 3; + } else { + if (dev->dev->bus_sprom-> + boardflags_lo & B43_BFL_RSSI) { + if (in_rssi > 63) + in_rssi = 63; + B43_WARN_ON(phy->type != B43_PHYTYPE_G); + tmp = gphy->nrssi_lt[in_rssi]; + tmp = 31 - tmp; + tmp *= -131; + tmp /= 128; + tmp -= 57; + } else { + tmp = in_rssi; + tmp = 31 - tmp; + tmp *= -149; + tmp /= 128; + tmp -= 68; + } + if (phy->type == B43_PHYTYPE_G && adjust_2050) + tmp += 25; + } + break; + case 0x2060: + if (in_rssi > 127) + tmp = in_rssi - 256; + else + tmp = in_rssi; + break; + default: + tmp = in_rssi; + tmp -= 11; + tmp *= 103; + tmp /= 64; + if (adjust_2053) + tmp -= 109; + else + tmp -= 83; + } + + return (s8) tmp; +} + +//TODO +#if 0 +static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi) +{ + struct b43_phy *phy = &dev->phy; + s8 ret; + + if (phy->type == B43_PHYTYPE_A) { + //TODO: Incomplete specs. + ret = 0; + } else + ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1); + + return ret; +} +#endif + +void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr) +{ + struct ieee80211_rx_status status; + struct b43_plcp_hdr6 *plcp; + struct ieee80211_hdr *wlhdr; + const struct b43_rxhdr_fw4 *rxhdr = _rxhdr; + __le16 fctl; + u16 phystat0, phystat3; + u16 uninitialized_var(chanstat), uninitialized_var(mactime); + u32 uninitialized_var(macstat); + u16 chanid; + u16 phytype; + int padding, rate_idx; + + memset(&status, 0, sizeof(status)); + + /* Get metadata about the frame from the header. */ + phystat0 = le16_to_cpu(rxhdr->phy_status0); + phystat3 = le16_to_cpu(rxhdr->phy_status3); + switch (dev->fw.hdr_format) { + case B43_FW_HDR_598: + macstat = le32_to_cpu(rxhdr->format_598.mac_status); + mactime = le16_to_cpu(rxhdr->format_598.mac_time); + chanstat = le16_to_cpu(rxhdr->format_598.channel); + break; + case B43_FW_HDR_410: + case B43_FW_HDR_351: + macstat = le32_to_cpu(rxhdr->format_351.mac_status); + mactime = le16_to_cpu(rxhdr->format_351.mac_time); + chanstat = le16_to_cpu(rxhdr->format_351.channel); + break; + } + phytype = chanstat & B43_RX_CHAN_PHYTYPE; + + if (unlikely(macstat & B43_RX_MAC_FCSERR)) { + dev->wl->ieee_stats.dot11FCSErrorCount++; + status.flag |= RX_FLAG_FAILED_FCS_CRC; + } + if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV))) + status.flag |= RX_FLAG_FAILED_PLCP_CRC; + if (phystat0 & B43_RX_PHYST0_SHORTPRMBL) + status.flag |= RX_FLAG_SHORTPRE; + if (macstat & B43_RX_MAC_DECERR) { + /* Decryption with the given key failed. + * Drop the packet. We also won't be able to decrypt it with + * the key in software. */ + goto drop; + } + + /* Skip PLCP and padding */ + padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0; + if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) { + b43dbg(dev->wl, "RX: Packet size underrun (1)\n"); + goto drop; + } + plcp = (struct b43_plcp_hdr6 *)(skb->data + padding); + skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding); + /* The skb contains the Wireless Header + payload data now */ + if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */ + FCS_LEN))) { + b43dbg(dev->wl, "RX: Packet size underrun (2)\n"); + goto drop; + } + wlhdr = (struct ieee80211_hdr *)(skb->data); + fctl = wlhdr->frame_control; + + if (macstat & B43_RX_MAC_DEC) { + unsigned int keyidx; + int wlhdr_len; + + keyidx = ((macstat & B43_RX_MAC_KEYIDX) + >> B43_RX_MAC_KEYIDX_SHIFT); + /* We must adjust the key index here. We want the "physical" + * key index, but the ucode passed it slightly different. + */ + keyidx = b43_kidx_to_raw(dev, keyidx); + B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key)); + + if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) { + wlhdr_len = ieee80211_hdrlen(fctl); + if (unlikely(skb->len < (wlhdr_len + 3))) { + b43dbg(dev->wl, + "RX: Packet size underrun (3)\n"); + goto drop; + } + status.flag |= RX_FLAG_DECRYPTED; + } + } + + /* Link quality statistics */ + switch (chanstat & B43_RX_CHAN_PHYTYPE) { + case B43_PHYTYPE_HT: + /* TODO: is max the right choice? */ + status.signal = max_t(__s8, + max(rxhdr->phy_ht_power0, rxhdr->phy_ht_power1), + rxhdr->phy_ht_power2); + break; + case B43_PHYTYPE_N: + /* Broadcom has code for min and avg, but always uses max */ + if (rxhdr->power0 == 16 || rxhdr->power0 == 32) + status.signal = max(rxhdr->power1, rxhdr->power2); + else + status.signal = max(rxhdr->power0, rxhdr->power1); + break; + case B43_PHYTYPE_A: + case B43_PHYTYPE_B: + case B43_PHYTYPE_G: + case B43_PHYTYPE_LP: + status.signal = b43_rssi_postprocess(dev, rxhdr->jssi, + (phystat0 & B43_RX_PHYST0_OFDM), + (phystat0 & B43_RX_PHYST0_GAINCTL), + (phystat3 & B43_RX_PHYST3_TRSTATE)); + break; + } + + if (phystat0 & B43_RX_PHYST0_OFDM) + rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp, + !!(chanstat & B43_RX_CHAN_5GHZ)); + else + rate_idx = b43_plcp_get_bitrate_idx_cck(plcp); + if (unlikely(rate_idx == -1)) { + /* PLCP seems to be corrupted. + * Drop the frame, if we are not interested in corrupted frames. */ + if (!(dev->wl->filter_flags & FIF_PLCPFAIL)) + goto drop; + } + status.rate_idx = rate_idx; + status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT); + + /* + * All frames on monitor interfaces and beacons always need a full + * 64-bit timestamp. Monitor interfaces need it for diagnostic + * purposes and beacons for IBSS merging. + * This code assumes we get to process the packet within 16 bits + * of timestamp, i.e. about 65 milliseconds after the PHY received + * the first symbol. + */ + if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) { + u16 low_mactime_now; + + b43_tsf_read(dev, &status.mactime); + low_mactime_now = status.mactime; + status.mactime = status.mactime & ~0xFFFFULL; + status.mactime += mactime; + if (low_mactime_now <= mactime) + status.mactime -= 0x10000; + status.flag |= RX_FLAG_MACTIME_START; + } + + chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT; + switch (chanstat & B43_RX_CHAN_PHYTYPE) { + case B43_PHYTYPE_A: + status.band = IEEE80211_BAND_5GHZ; + B43_WARN_ON(1); + /* FIXME: We don't really know which value the "chanid" contains. + * So the following assignment might be wrong. */ + status.freq = + ieee80211_channel_to_frequency(chanid, status.band); + break; + case B43_PHYTYPE_G: + status.band = IEEE80211_BAND_2GHZ; + /* Somewhere between 478.104 and 508.1084 firmware for G-PHY + * has been modified to be compatible with N-PHY and others. + */ + if (dev->fw.rev >= 508) + status.freq = ieee80211_channel_to_frequency(chanid, status.band); + else + status.freq = chanid + 2400; + break; + case B43_PHYTYPE_N: + case B43_PHYTYPE_LP: + case B43_PHYTYPE_HT: + /* chanid is the SHM channel cookie. Which is the plain + * channel number in b43. */ + if (chanstat & B43_RX_CHAN_5GHZ) + status.band = IEEE80211_BAND_5GHZ; + else + status.band = IEEE80211_BAND_2GHZ; + status.freq = + ieee80211_channel_to_frequency(chanid, status.band); + break; + default: + B43_WARN_ON(1); + goto drop; + } + + memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); + ieee80211_rx_ni(dev->wl->hw, skb); + +#if B43_DEBUG + dev->rx_count++; +#endif + return; +drop: + dev_kfree_skb_any(skb); +} + +void b43_handle_txstatus(struct b43_wldev *dev, + const struct b43_txstatus *status) +{ + b43_debugfs_log_txstat(dev, status); + + if (status->intermediate) + return; + if (status->for_ampdu) + return; + if (!status->acked) + dev->wl->ieee_stats.dot11ACKFailureCount++; + if (status->rts_count) { + if (status->rts_count == 0xF) //FIXME + dev->wl->ieee_stats.dot11RTSFailureCount++; + else + dev->wl->ieee_stats.dot11RTSSuccessCount++; + } + + if (b43_using_pio_transfers(dev)) + b43_pio_handle_txstatus(dev, status); + else + b43_dma_handle_txstatus(dev, status); + + b43_phy_txpower_check(dev, 0); +} + +/* Fill out the mac80211 TXstatus report based on the b43-specific + * txstatus report data. This returns a boolean whether the frame was + * successfully transmitted. */ +bool b43_fill_txstatus_report(struct b43_wldev *dev, + struct ieee80211_tx_info *report, + const struct b43_txstatus *status) +{ + bool frame_success = true; + int retry_limit; + + /* preserve the confiured retry limit before clearing the status + * The xmit function has overwritten the rc's value with the actual + * retry limit done by the hardware */ + retry_limit = report->status.rates[0].count; + ieee80211_tx_info_clear_status(report); + + if (status->acked) { + /* The frame was ACKed. */ + report->flags |= IEEE80211_TX_STAT_ACK; + } else { + /* The frame was not ACKed... */ + if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) { + /* ...but we expected an ACK. */ + frame_success = false; + } + } + if (status->frame_count == 0) { + /* The frame was not transmitted at all. */ + report->status.rates[0].count = 0; + } else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { + /* + * If the short retries (RTS, not data frame) have exceeded + * the limit, the hw will not have tried the selected rate, + * but will have used the fallback rate instead. + * Don't let the rate control count attempts for the selected + * rate in this case, otherwise the statistics will be off. + */ + report->status.rates[0].count = 0; + report->status.rates[1].count = status->frame_count; + } else { + if (status->frame_count > retry_limit) { + report->status.rates[0].count = retry_limit; + report->status.rates[1].count = status->frame_count - + retry_limit; + + } else { + report->status.rates[0].count = status->frame_count; + report->status.rates[1].idx = -1; + } + } + + return frame_success; +} + +/* Stop any TX operation on the device (suspend the hardware queues) */ +void b43_tx_suspend(struct b43_wldev *dev) +{ + if (b43_using_pio_transfers(dev)) + b43_pio_tx_suspend(dev); + else + b43_dma_tx_suspend(dev); +} + +/* Resume any TX operation on the device (resume the hardware queues) */ +void b43_tx_resume(struct b43_wldev *dev) +{ + if (b43_using_pio_transfers(dev)) + b43_pio_tx_resume(dev); + else + b43_dma_tx_resume(dev); +} |