xmit.c

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/*

  Broadcom B43 wireless driver

  Transmission (TX/RX) related functions.

  Copyright (C) 2005 Martin Langer <[email protected]>
  Copyright (C) 2005 Stefano Brivio <[email protected]>
  Copyright (C) 2005, 2006 Michael Buesch <[email protected]>
  Copyright (C) 2005 Danny van Dyk <[email protected]>
  Copyright (C) 2005 Andreas Jaggi <[email protected]>

  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 aphy)
{
    int base = aphy ? 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, 6);

    /* 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((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->type == B43_PHYTYPE_A)
        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,
                        phytype == B43_PHYTYPE_A);
    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_MPDU;
    }

    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 = b43_channel_to_freq_5ghz(chanid);
        break;
    case B43_PHYTYPE_G:
        status.band = IEEE80211_BAND_2GHZ;
        /* chanid is the radio channel cookie value as used
         * to tune the radio. */
        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;
            status.freq = b43_freq_to_channel_5ghz(chanid);
        } else {
            status.band = IEEE80211_BAND_2GHZ;
            status.freq = b43_freq_to_channel_2ghz(chanid);
        }
        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);
}