main.c

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/*
 *  Copyright (C) 2008, cozybit Inc.
 *  Copyright (C) 2003-2006, Marvell International Ltd.
 *
 *  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.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/hardirq.h>
#include <linux/slab.h>

#include <linux/etherdevice.h>
#include <linux/module.h>
#include "libertas_tf.h"

#define DRIVER_RELEASE_VERSION "004.p0"
/* thinfirm version: 5.132.X.pX */
#define LBTF_FW_VER_MIN     0x05840300
#define LBTF_FW_VER_MAX     0x0584ffff
#define QOS_CONTROL_LEN     2

/* Module parameters */
unsigned int lbtf_debug;
EXPORT_SYMBOL_GPL(lbtf_debug);
module_param_named(libertas_tf_debug, lbtf_debug, int, 0644);

static const char lbtf_driver_version[] = "THINFIRM-USB8388-" DRIVER_RELEASE_VERSION
#ifdef DEBUG
    "-dbg"
#endif
    "";

struct workqueue_struct *lbtf_wq;

static const struct ieee80211_channel lbtf_channels[] = {
    { .center_freq = 2412, .hw_value = 1 },
    { .center_freq = 2417, .hw_value = 2 },
    { .center_freq = 2422, .hw_value = 3 },
    { .center_freq = 2427, .hw_value = 4 },
    { .center_freq = 2432, .hw_value = 5 },
    { .center_freq = 2437, .hw_value = 6 },
    { .center_freq = 2442, .hw_value = 7 },
    { .center_freq = 2447, .hw_value = 8 },
    { .center_freq = 2452, .hw_value = 9 },
    { .center_freq = 2457, .hw_value = 10 },
    { .center_freq = 2462, .hw_value = 11 },
    { .center_freq = 2467, .hw_value = 12 },
    { .center_freq = 2472, .hw_value = 13 },
    { .center_freq = 2484, .hw_value = 14 },
};

/* This table contains the hardware specific values for the modulation rates. */
static const struct ieee80211_rate lbtf_rates[] = {
    { .bitrate = 10,
      .hw_value = 0, },
    { .bitrate = 20,
      .hw_value = 1,
      .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 55,
      .hw_value = 2,
      .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 110,
      .hw_value = 3,
      .flags = IEEE80211_RATE_SHORT_PREAMBLE },
    { .bitrate = 60,
      .hw_value = 5,
      .flags = 0 },
    { .bitrate = 90,
      .hw_value = 6,
      .flags = 0 },
    { .bitrate = 120,
      .hw_value = 7,
      .flags = 0 },
    { .bitrate = 180,
      .hw_value = 8,
      .flags = 0 },
    { .bitrate = 240,
      .hw_value = 9,
      .flags = 0 },
    { .bitrate = 360,
      .hw_value = 10,
      .flags = 0 },
    { .bitrate = 480,
      .hw_value = 11,
      .flags = 0 },
    { .bitrate = 540,
      .hw_value = 12,
      .flags = 0 },
};

static void lbtf_cmd_work(struct work_struct *work)
{
    struct lbtf_private *priv = container_of(work, struct lbtf_private,
                     cmd_work);

    lbtf_deb_enter(LBTF_DEB_CMD);

    spin_lock_irq(&priv->driver_lock);
    /* command response? */
    if (priv->cmd_response_rxed) {
        priv->cmd_response_rxed = 0;
        spin_unlock_irq(&priv->driver_lock);
        lbtf_process_rx_command(priv);
        spin_lock_irq(&priv->driver_lock);
    }

    if (priv->cmd_timed_out && priv->cur_cmd) {
        struct cmd_ctrl_node *cmdnode = priv->cur_cmd;

        if (++priv->nr_retries > 10) {
            lbtf_complete_command(priv, cmdnode,
                          -ETIMEDOUT);
            priv->nr_retries = 0;
        } else {
            priv->cur_cmd = NULL;

            /* Stick it back at the _top_ of the pending
             * queue for immediate resubmission */
            list_add(&cmdnode->list, &priv->cmdpendingq);
        }
    }
    priv->cmd_timed_out = 0;
    spin_unlock_irq(&priv->driver_lock);

    if (!priv->fw_ready) {
        lbtf_deb_leave_args(LBTF_DEB_CMD, "fw not ready");
        return;
    }

    /* Execute the next command */
    if (!priv->cur_cmd)
        lbtf_execute_next_command(priv);

    lbtf_deb_leave(LBTF_DEB_CMD);
}

static int lbtf_setup_firmware(struct lbtf_private *priv)
{
    int ret = -1;

    lbtf_deb_enter(LBTF_DEB_FW);
    /*
     * Read priv address from HW
     */
    memset(priv->current_addr, 0xff, ETH_ALEN);
    ret = lbtf_update_hw_spec(priv);
    if (ret) {
        ret = -1;
        goto done;
    }

    lbtf_set_mac_control(priv);
    lbtf_set_radio_control(priv);

    ret = 0;
done:
    lbtf_deb_leave_args(LBTF_DEB_FW, "ret: %d", ret);
    return ret;
}

static void command_timer_fn(unsigned long data)
{
    struct lbtf_private *priv = (struct lbtf_private *)data;
    unsigned long flags;
    lbtf_deb_enter(LBTF_DEB_CMD);

    spin_lock_irqsave(&priv->driver_lock, flags);

    if (!priv->cur_cmd) {
        printk(KERN_DEBUG "libertastf: command timer expired; "
                  "no pending command\n");
        goto out;
    }

    printk(KERN_DEBUG "libertas: command %x timed out\n",
        le16_to_cpu(priv->cur_cmd->cmdbuf->command));

    priv->cmd_timed_out = 1;
    queue_work(lbtf_wq, &priv->cmd_work);
out:
    spin_unlock_irqrestore(&priv->driver_lock, flags);
    lbtf_deb_leave(LBTF_DEB_CMD);
}

static int lbtf_init_adapter(struct lbtf_private *priv)
{
    lbtf_deb_enter(LBTF_DEB_MAIN);
    memset(priv->current_addr, 0xff, ETH_ALEN);
    mutex_init(&priv->lock);

    priv->vif = NULL;
    setup_timer(&priv->command_timer, command_timer_fn,
        (unsigned long)priv);

    INIT_LIST_HEAD(&priv->cmdfreeq);
    INIT_LIST_HEAD(&priv->cmdpendingq);

    spin_lock_init(&priv->driver_lock);

    /* Allocate the command buffers */
    if (lbtf_allocate_cmd_buffer(priv))
        return -1;

    lbtf_deb_leave(LBTF_DEB_MAIN);
    return 0;
}

static void lbtf_free_adapter(struct lbtf_private *priv)
{
    lbtf_deb_enter(LBTF_DEB_MAIN);
    lbtf_free_cmd_buffer(priv);
    del_timer(&priv->command_timer);
    lbtf_deb_leave(LBTF_DEB_MAIN);
}

static void lbtf_op_tx(struct ieee80211_hw *hw,
               struct ieee80211_tx_control *control,
               struct sk_buff *skb)
{
    struct lbtf_private *priv = hw->priv;

    priv->skb_to_tx = skb;
    queue_work(lbtf_wq, &priv->tx_work);
    /*
     * queue will be restarted when we receive transmission feedback if
     * there are no buffered multicast frames to send
     */
    ieee80211_stop_queues(priv->hw);
}

static void lbtf_tx_work(struct work_struct *work)
{
    struct lbtf_private *priv = container_of(work, struct lbtf_private,
                     tx_work);
    unsigned int len;
    struct ieee80211_tx_info *info;
    struct txpd *txpd;
    struct sk_buff *skb = NULL;
    int err;

    lbtf_deb_enter(LBTF_DEB_MACOPS | LBTF_DEB_TX);

    if ((priv->vif->type == NL80211_IFTYPE_AP) &&
        (!skb_queue_empty(&priv->bc_ps_buf)))
        skb = skb_dequeue(&priv->bc_ps_buf);
    else if (priv->skb_to_tx) {
        skb = priv->skb_to_tx;
        priv->skb_to_tx = NULL;
    } else {
        lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
        return;
    }

    len = skb->len;
    info  = IEEE80211_SKB_CB(skb);
    txpd = (struct txpd *)  skb_push(skb, sizeof(struct txpd));

    if (priv->surpriseremoved) {
        dev_kfree_skb_any(skb);
        lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
        return;
    }

    memset(txpd, 0, sizeof(struct txpd));
    /* Activate per-packet rate selection */
    txpd->tx_control |= cpu_to_le32(MRVL_PER_PACKET_RATE |
                 ieee80211_get_tx_rate(priv->hw, info)->hw_value);

    /* copy destination address from 802.11 header */
    memcpy(txpd->tx_dest_addr_high, skb->data + sizeof(struct txpd) + 4,
        ETH_ALEN);
    txpd->tx_packet_length = cpu_to_le16(len);
    txpd->tx_packet_location = cpu_to_le32(sizeof(struct txpd));
    lbtf_deb_hex(LBTF_DEB_TX, "TX Data", skb->data, min_t(unsigned int, skb->len, 100));
    BUG_ON(priv->tx_skb);
    spin_lock_irq(&priv->driver_lock);
    priv->tx_skb = skb;
    err = priv->hw_host_to_card(priv, MVMS_DAT, skb->data, skb->len);
    spin_unlock_irq(&priv->driver_lock);
    if (err) {
        dev_kfree_skb_any(skb);
        priv->tx_skb = NULL;
        pr_err("TX error: %d", err);
    }
    lbtf_deb_leave(LBTF_DEB_MACOPS | LBTF_DEB_TX);
}

static int lbtf_op_start(struct ieee80211_hw *hw)
{
    struct lbtf_private *priv = hw->priv;
    void *card = priv->card;
    int ret = -1;

    lbtf_deb_enter(LBTF_DEB_MACOPS);

    if (!priv->fw_ready)
        /* Upload firmware */
        if (priv->hw_prog_firmware(card))
            goto err_prog_firmware;

    /* poke the firmware */
    priv->capability = WLAN_CAPABILITY_SHORT_PREAMBLE;
    priv->radioon = RADIO_ON;
    priv->mac_control = CMD_ACT_MAC_RX_ON | CMD_ACT_MAC_TX_ON;
    ret = lbtf_setup_firmware(priv);
    if (ret)
        goto err_prog_firmware;

    if ((priv->fwrelease < LBTF_FW_VER_MIN) ||
        (priv->fwrelease > LBTF_FW_VER_MAX)) {
        ret = -1;
        goto err_prog_firmware;
    }

    printk(KERN_INFO "libertastf: Marvell WLAN 802.11 thinfirm adapter\n");
    lbtf_deb_leave(LBTF_DEB_MACOPS);
    return 0;

err_prog_firmware:
    priv->hw_reset_device(card);
    lbtf_deb_leave_args(LBTF_DEB_MACOPS, "error programing fw; ret=%d", ret);
    return ret;
}

static void lbtf_op_stop(struct ieee80211_hw *hw)
{
    struct lbtf_private *priv = hw->priv;
    unsigned long flags;
    struct sk_buff *skb;

    struct cmd_ctrl_node *cmdnode;

    lbtf_deb_enter(LBTF_DEB_MACOPS);

    /* Flush pending command nodes */
    spin_lock_irqsave(&priv->driver_lock, flags);
    list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
        cmdnode->result = -ENOENT;
        cmdnode->cmdwaitqwoken = 1;
        wake_up_interruptible(&cmdnode->cmdwait_q);
    }

    spin_unlock_irqrestore(&priv->driver_lock, flags);
    cancel_work_sync(&priv->cmd_work);
    cancel_work_sync(&priv->tx_work);
    while ((skb = skb_dequeue(&priv->bc_ps_buf)))
        dev_kfree_skb_any(skb);
    priv->radioon = RADIO_OFF;
    lbtf_set_radio_control(priv);

    lbtf_deb_leave(LBTF_DEB_MACOPS);
}

static int lbtf_op_add_interface(struct ieee80211_hw *hw,
            struct ieee80211_vif *vif)
{
    struct lbtf_private *priv = hw->priv;
    lbtf_deb_enter(LBTF_DEB_MACOPS);
    if (priv->vif != NULL)
        return -EOPNOTSUPP;

    priv->vif = vif;
    switch (vif->type) {
    case NL80211_IFTYPE_MESH_POINT:
    case NL80211_IFTYPE_AP:
        lbtf_set_mode(priv, LBTF_AP_MODE);
        break;
    case NL80211_IFTYPE_STATION:
        lbtf_set_mode(priv, LBTF_STA_MODE);
        break;
    default:
        priv->vif = NULL;
        return -EOPNOTSUPP;
    }
    lbtf_set_mac_address(priv, (u8 *) vif->addr);
    lbtf_deb_leave(LBTF_DEB_MACOPS);
    return 0;
}

static void lbtf_op_remove_interface(struct ieee80211_hw *hw,
            struct ieee80211_vif *vif)
{
    struct lbtf_private *priv = hw->priv;
    lbtf_deb_enter(LBTF_DEB_MACOPS);

    if (priv->vif->type == NL80211_IFTYPE_AP ||
        priv->vif->type == NL80211_IFTYPE_MESH_POINT)
        lbtf_beacon_ctrl(priv, 0, 0);
    lbtf_set_mode(priv, LBTF_PASSIVE_MODE);
    lbtf_set_bssid(priv, 0, NULL);
    priv->vif = NULL;
    lbtf_deb_leave(LBTF_DEB_MACOPS);
}

static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
{
    struct lbtf_private *priv = hw->priv;
    struct ieee80211_conf *conf = &hw->conf;
    lbtf_deb_enter(LBTF_DEB_MACOPS);

    if (conf->channel->center_freq != priv->cur_freq) {
        priv->cur_freq = conf->channel->center_freq;
        lbtf_set_channel(priv, conf->channel->hw_value);
    }
    lbtf_deb_leave(LBTF_DEB_MACOPS);
    return 0;
}

static u64 lbtf_op_prepare_multicast(struct ieee80211_hw *hw,
                     struct netdev_hw_addr_list *mc_list)
{
    struct lbtf_private *priv = hw->priv;
    int i;
    struct netdev_hw_addr *ha;
    int mc_count = netdev_hw_addr_list_count(mc_list);

    if (!mc_count || mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE)
        return mc_count;

    priv->nr_of_multicastmacaddr = mc_count;
    i = 0;
    netdev_hw_addr_list_for_each(ha, mc_list)
        memcpy(&priv->multicastlist[i++], ha->addr, ETH_ALEN);

    return mc_count;
}

#define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
            unsigned int changed_flags,
            unsigned int *new_flags,
            u64 multicast)
{
    struct lbtf_private *priv = hw->priv;
    int old_mac_control = priv->mac_control;

    lbtf_deb_enter(LBTF_DEB_MACOPS);

    changed_flags &= SUPPORTED_FIF_FLAGS;
    *new_flags &= SUPPORTED_FIF_FLAGS;

    if (!changed_flags) {
        lbtf_deb_leave(LBTF_DEB_MACOPS);
        return;
    }

    if (*new_flags & (FIF_PROMISC_IN_BSS))
        priv->mac_control |= CMD_ACT_MAC_PROMISCUOUS_ENABLE;
    else
        priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
    if (*new_flags & (FIF_ALLMULTI) ||
        multicast > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
        priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
        priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
    } else if (multicast) {
        priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
        priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
        lbtf_cmd_set_mac_multicast_addr(priv);
    } else {
        priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
                       CMD_ACT_MAC_ALL_MULTICAST_ENABLE);
        if (priv->nr_of_multicastmacaddr) {
            priv->nr_of_multicastmacaddr = 0;
            lbtf_cmd_set_mac_multicast_addr(priv);
        }
    }


    if (priv->mac_control != old_mac_control)
        lbtf_set_mac_control(priv);

    lbtf_deb_leave(LBTF_DEB_MACOPS);
}

static void lbtf_op_bss_info_changed(struct ieee80211_hw *hw,
            struct ieee80211_vif *vif,
            struct ieee80211_bss_conf *bss_conf,
            u32 changes)
{
    struct lbtf_private *priv = hw->priv;
    struct sk_buff *beacon;
    lbtf_deb_enter(LBTF_DEB_MACOPS);

    if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_INT)) {
        switch (priv->vif->type) {
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_MESH_POINT:
            beacon = ieee80211_beacon_get(hw, vif);
            if (beacon) {
                lbtf_beacon_set(priv, beacon);
                kfree_skb(beacon);
                lbtf_beacon_ctrl(priv, 1,
                         bss_conf->beacon_int);
            }
            break;
        default:
            break;
        }
    }

    if (changes & BSS_CHANGED_BSSID) {
        bool activate = !is_zero_ether_addr(bss_conf->bssid);
        lbtf_set_bssid(priv, activate, bss_conf->bssid);
    }

    if (changes & BSS_CHANGED_ERP_PREAMBLE) {
        if (bss_conf->use_short_preamble)
            priv->preamble = CMD_TYPE_SHORT_PREAMBLE;
        else
            priv->preamble = CMD_TYPE_LONG_PREAMBLE;
        lbtf_set_radio_control(priv);
    }

    lbtf_deb_leave(LBTF_DEB_MACOPS);
}

static int lbtf_op_get_survey(struct ieee80211_hw *hw, int idx,
                struct survey_info *survey)
{
    struct lbtf_private *priv = hw->priv;
    struct ieee80211_conf *conf = &hw->conf;

    if (idx != 0)
        return -ENOENT;

    survey->channel = conf->channel;
    survey->filled = SURVEY_INFO_NOISE_DBM;
    survey->noise = priv->noise;

    return 0;
}

static const struct ieee80211_ops lbtf_ops = {
    .tx         = lbtf_op_tx,
    .start          = lbtf_op_start,
    .stop           = lbtf_op_stop,
    .add_interface      = lbtf_op_add_interface,
    .remove_interface   = lbtf_op_remove_interface,
    .config         = lbtf_op_config,
    .prepare_multicast  = lbtf_op_prepare_multicast,
    .configure_filter   = lbtf_op_configure_filter,
    .bss_info_changed   = lbtf_op_bss_info_changed,
    .get_survey     = lbtf_op_get_survey,
};

int lbtf_rx(struct lbtf_private *priv, struct sk_buff *skb)
{
    struct ieee80211_rx_status stats;
    struct rxpd *prxpd;
    int need_padding;
    unsigned int flags;
    struct ieee80211_hdr *hdr;

    lbtf_deb_enter(LBTF_DEB_RX);

    prxpd = (struct rxpd *) skb->data;

    memset(&stats, 0, sizeof(stats));
    if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
        stats.flag |= RX_FLAG_FAILED_FCS_CRC;
    stats.freq = priv->cur_freq;
    stats.band = IEEE80211_BAND_2GHZ;
    stats.signal = prxpd->snr;
    priv->noise = prxpd->nf;
    /* Marvell rate index has a hole at value 4 */
    if (prxpd->rx_rate > 4)
        --prxpd->rx_rate;
    stats.rate_idx = prxpd->rx_rate;
    skb_pull(skb, sizeof(struct rxpd));

    hdr = (struct ieee80211_hdr *)skb->data;
    flags = le32_to_cpu(*(__le32 *)(skb->data + 4));

    need_padding = ieee80211_is_data_qos(hdr->frame_control);
    need_padding ^= ieee80211_has_a4(hdr->frame_control);
    need_padding ^= ieee80211_is_data_qos(hdr->frame_control) &&
            (*ieee80211_get_qos_ctl(hdr) &
             IEEE80211_QOS_CTL_A_MSDU_PRESENT);

    if (need_padding) {
        memmove(skb->data + 2, skb->data, skb->len);
        skb_reserve(skb, 2);
    }

    memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));

    lbtf_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
           skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
    lbtf_deb_hex(LBTF_DEB_RX, "RX Data", skb->data,
                 min_t(unsigned int, skb->len, 100));

    ieee80211_rx_irqsafe(priv->hw, skb);

    lbtf_deb_leave(LBTF_DEB_RX);
    return 0;
}
EXPORT_SYMBOL_GPL(lbtf_rx);

struct lbtf_private *lbtf_add_card(void *card, struct device *dmdev)
{
    struct ieee80211_hw *hw;
    struct lbtf_private *priv = NULL;

    lbtf_deb_enter(LBTF_DEB_MAIN);

    hw = ieee80211_alloc_hw(sizeof(struct lbtf_private), &lbtf_ops);
    if (!hw)
        goto done;

    priv = hw->priv;
    if (lbtf_init_adapter(priv))
        goto err_init_adapter;

    priv->hw = hw;
    priv->card = card;
    priv->tx_skb = NULL;

    hw->queues = 1;
    hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
    hw->extra_tx_headroom = sizeof(struct txpd);
    memcpy(priv->channels, lbtf_channels, sizeof(lbtf_channels));
    memcpy(priv->rates, lbtf_rates, sizeof(lbtf_rates));
    priv->band.n_bitrates = ARRAY_SIZE(lbtf_rates);
    priv->band.bitrates = priv->rates;
    priv->band.n_channels = ARRAY_SIZE(lbtf_channels);
    priv->band.channels = priv->channels;
    hw->wiphy->bands[IEEE80211_BAND_2GHZ] = &priv->band;
    hw->wiphy->interface_modes =
        BIT(NL80211_IFTYPE_STATION) |
        BIT(NL80211_IFTYPE_ADHOC);
    skb_queue_head_init(&priv->bc_ps_buf);

    SET_IEEE80211_DEV(hw, dmdev);

    INIT_WORK(&priv->cmd_work, lbtf_cmd_work);
    INIT_WORK(&priv->tx_work, lbtf_tx_work);
    if (ieee80211_register_hw(hw))
        goto err_init_adapter;

    goto done;

err_init_adapter:
    lbtf_free_adapter(priv);
    ieee80211_free_hw(hw);
    priv = NULL;

done:
    lbtf_deb_leave_args(LBTF_DEB_MAIN, "priv %p", priv);
    return priv;
}
EXPORT_SYMBOL_GPL(lbtf_add_card);


int lbtf_remove_card(struct lbtf_private *priv)
{
    struct ieee80211_hw *hw = priv->hw;

    lbtf_deb_enter(LBTF_DEB_MAIN);

    priv->surpriseremoved = 1;
    del_timer(&priv->command_timer);
    lbtf_free_adapter(priv);
    priv->hw = NULL;
    ieee80211_unregister_hw(hw);
    ieee80211_free_hw(hw);

    lbtf_deb_leave(LBTF_DEB_MAIN);
    return 0;
}
EXPORT_SYMBOL_GPL(lbtf_remove_card);

void lbtf_send_tx_feedback(struct lbtf_private *priv, u8 retrycnt, u8 fail)
{
    struct ieee80211_tx_info *info = IEEE80211_SKB_CB(priv->tx_skb);

    ieee80211_tx_info_clear_status(info);
    /*
     * Commented out, otherwise we never go beyond 1Mbit/s using mac80211
     * default pid rc algorithm.
     *
     * info->status.retry_count = MRVL_DEFAULT_RETRIES - retrycnt;
     */
    if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) && !fail)
        info->flags |= IEEE80211_TX_STAT_ACK;
    skb_pull(priv->tx_skb, sizeof(struct txpd));
    ieee80211_tx_status_irqsafe(priv->hw, priv->tx_skb);
    priv->tx_skb = NULL;
    if (!priv->skb_to_tx && skb_queue_empty(&priv->bc_ps_buf))
        ieee80211_wake_queues(priv->hw);
    else
        queue_work(lbtf_wq, &priv->tx_work);
}
EXPORT_SYMBOL_GPL(lbtf_send_tx_feedback);

void lbtf_bcn_sent(struct lbtf_private *priv)
{
    struct sk_buff *skb = NULL;

    if (priv->vif->type != NL80211_IFTYPE_AP)
        return;

    if (skb_queue_empty(&priv->bc_ps_buf)) {
        bool tx_buff_bc = false;

        while ((skb = ieee80211_get_buffered_bc(priv->hw, priv->vif))) {
            skb_queue_tail(&priv->bc_ps_buf, skb);
            tx_buff_bc = true;
        }
        if (tx_buff_bc) {
            ieee80211_stop_queues(priv->hw);
            queue_work(lbtf_wq, &priv->tx_work);
        }
    }

    skb = ieee80211_beacon_get(priv->hw, priv->vif);

    if (skb) {
        lbtf_beacon_set(priv, skb);
        kfree_skb(skb);
    }
}
EXPORT_SYMBOL_GPL(lbtf_bcn_sent);

static int __init lbtf_init_module(void)
{
    lbtf_deb_enter(LBTF_DEB_MAIN);
    lbtf_wq = create_workqueue("libertastf");
    if (lbtf_wq == NULL) {
        printk(KERN_ERR "libertastf: couldn't create workqueue\n");
        return -ENOMEM;
    }
    lbtf_deb_leave(LBTF_DEB_MAIN);
    return 0;
}

static void __exit lbtf_exit_module(void)
{
    lbtf_deb_enter(LBTF_DEB_MAIN);
    destroy_workqueue(lbtf_wq);
    lbtf_deb_leave(LBTF_DEB_MAIN);
}

module_init(lbtf_init_module);
module_exit(lbtf_exit_module);

MODULE_DESCRIPTION("Libertas WLAN Thinfirm Driver Library");
MODULE_AUTHOR("Cozybit Inc.");
MODULE_LICENSE("GPL");