11n.c

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/*
 * Marvell Wireless LAN device driver: 802.11n
 *
 * Copyright (C) 2011, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"

/*
 * Fills HT capability information field, AMPDU Parameters field, HT extended
 * capability field, and supported MCS set fields.
 *
 * HT capability information field, AMPDU Parameters field, supported MCS set
 * fields are retrieved from cfg80211 stack
 *
 * RD responder bit to set to clear in the extended capability header.
 */
void
mwifiex_fill_cap_info(struct mwifiex_private *priv, u8 radio_type,
              struct mwifiex_ie_types_htcap *ht_cap)
{
    uint16_t ht_ext_cap = le16_to_cpu(ht_cap->ht_cap.extended_ht_cap_info);
    struct ieee80211_supported_band *sband =
                    priv->wdev->wiphy->bands[radio_type];

    ht_cap->ht_cap.ampdu_params_info =
        (sband->ht_cap.ampdu_factor &
         IEEE80211_HT_AMPDU_PARM_FACTOR) |
        ((sband->ht_cap.ampdu_density <<
         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT) &
         IEEE80211_HT_AMPDU_PARM_DENSITY);

    memcpy((u8 *) &ht_cap->ht_cap.mcs, &sband->ht_cap.mcs,
           sizeof(sband->ht_cap.mcs));

    if (priv->bss_mode == NL80211_IFTYPE_STATION ||
        sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
        /* Set MCS32 for infra mode or ad-hoc mode with 40MHz support */
        SETHT_MCS32(ht_cap->ht_cap.mcs.rx_mask);

    /* Clear RD responder bit */
    ht_ext_cap &= ~IEEE80211_HT_EXT_CAP_RD_RESPONDER;

    ht_cap->ht_cap.cap_info = cpu_to_le16(sband->ht_cap.cap);
    ht_cap->ht_cap.extended_ht_cap_info = cpu_to_le16(ht_ext_cap);
}

/*
 * This function returns the pointer to an entry in BA Stream
 * table which matches the requested BA status.
 */
static struct mwifiex_tx_ba_stream_tbl *
mwifiex_get_ba_status(struct mwifiex_private *priv,
              enum mwifiex_ba_status ba_status)
{
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tsr_tbl;
    unsigned long flags;

    spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
    list_for_each_entry(tx_ba_tsr_tbl, &priv->tx_ba_stream_tbl_ptr, list) {
        if (tx_ba_tsr_tbl->ba_status == ba_status) {
            spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock,
                           flags);
            return tx_ba_tsr_tbl;
        }
    }
    spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
    return NULL;
}

/*
 * This function handles the command response of delete a block
 * ack request.
 *
 * The function checks the response success status and takes action
 * accordingly (send an add BA request in case of success, or recreate
 * the deleted stream in case of failure, if the add BA was also
 * initiated by us).
 */
int mwifiex_ret_11n_delba(struct mwifiex_private *priv,
              struct host_cmd_ds_command *resp)
{
    int tid;
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tbl;
    struct host_cmd_ds_11n_delba *del_ba = &resp->params.del_ba;
    uint16_t del_ba_param_set = le16_to_cpu(del_ba->del_ba_param_set);

    tid = del_ba_param_set >> DELBA_TID_POS;
    if (del_ba->del_result == BA_RESULT_SUCCESS) {
        mwifiex_del_ba_tbl(priv, tid, del_ba->peer_mac_addr,
                   TYPE_DELBA_SENT,
                   INITIATOR_BIT(del_ba_param_set));

        tx_ba_tbl = mwifiex_get_ba_status(priv, BA_SETUP_INPROGRESS);
        if (tx_ba_tbl)
            mwifiex_send_addba(priv, tx_ba_tbl->tid,
                       tx_ba_tbl->ra);
    } else { /*
          * In case of failure, recreate the deleted stream in case
          * we initiated the ADDBA
          */
        if (!INITIATOR_BIT(del_ba_param_set))
            return 0;

        mwifiex_create_ba_tbl(priv, del_ba->peer_mac_addr, tid,
                      BA_SETUP_INPROGRESS);

        tx_ba_tbl = mwifiex_get_ba_status(priv, BA_SETUP_INPROGRESS);

        if (tx_ba_tbl)
            mwifiex_del_ba_tbl(priv, tx_ba_tbl->tid, tx_ba_tbl->ra,
                       TYPE_DELBA_SENT, true);
    }

    return 0;
}

/*
 * This function handles the command response of add a block
 * ack request.
 *
 * Handling includes changing the header fields to CPU formats, checking
 * the response success status and taking actions accordingly (delete the
 * BA stream table in case of failure).
 */
int mwifiex_ret_11n_addba_req(struct mwifiex_private *priv,
                  struct host_cmd_ds_command *resp)
{
    int tid;
    struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tbl;

    add_ba_rsp->ssn = cpu_to_le16((le16_to_cpu(add_ba_rsp->ssn))
            & SSN_MASK);

    tid = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
        & IEEE80211_ADDBA_PARAM_TID_MASK)
        >> BLOCKACKPARAM_TID_POS;
    if (le16_to_cpu(add_ba_rsp->status_code) == BA_RESULT_SUCCESS) {
        tx_ba_tbl = mwifiex_get_ba_tbl(priv, tid,
                        add_ba_rsp->peer_mac_addr);
        if (tx_ba_tbl) {
            dev_dbg(priv->adapter->dev, "info: BA stream complete\n");
            tx_ba_tbl->ba_status = BA_SETUP_COMPLETE;
        } else {
            dev_err(priv->adapter->dev, "BA stream not created\n");
        }
    } else {
        mwifiex_del_ba_tbl(priv, tid, add_ba_rsp->peer_mac_addr,
                   TYPE_DELBA_SENT, true);
        if (add_ba_rsp->add_rsp_result != BA_RESULT_TIMEOUT)
            priv->aggr_prio_tbl[tid].ampdu_ap =
                BA_STREAM_NOT_ALLOWED;
    }

    return 0;
}

/*
 * This function prepares command of reconfigure Tx buffer.
 *
 * Preparation includes -
 *      - Setting command ID, action and proper size
 *      - Setting Tx buffer size (for SET only)
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_recfg_tx_buf(struct mwifiex_private *priv,
                 struct host_cmd_ds_command *cmd, int cmd_action,
                 u16 *buf_size)
{
    struct host_cmd_ds_txbuf_cfg *tx_buf = &cmd->params.tx_buf;
    u16 action = (u16) cmd_action;

    cmd->command = cpu_to_le16(HostCmd_CMD_RECONFIGURE_TX_BUFF);
    cmd->size =
        cpu_to_le16(sizeof(struct host_cmd_ds_txbuf_cfg) + S_DS_GEN);
    tx_buf->action = cpu_to_le16(action);
    switch (action) {
    case HostCmd_ACT_GEN_SET:
        dev_dbg(priv->adapter->dev, "cmd: set tx_buf=%d\n", *buf_size);
        tx_buf->buff_size = cpu_to_le16(*buf_size);
        break;
    case HostCmd_ACT_GEN_GET:
    default:
        tx_buf->buff_size = 0;
        break;
    }
    return 0;
}

/*
 * This function prepares command of AMSDU aggregation control.
 *
 * Preparation includes -
 *      - Setting command ID, action and proper size
 *      - Setting AMSDU control parameters (for SET only)
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_amsdu_aggr_ctrl(struct host_cmd_ds_command *cmd,
                int cmd_action,
                struct mwifiex_ds_11n_amsdu_aggr_ctrl *aa_ctrl)
{
    struct host_cmd_ds_amsdu_aggr_ctrl *amsdu_ctrl =
        &cmd->params.amsdu_aggr_ctrl;
    u16 action = (u16) cmd_action;

    cmd->command = cpu_to_le16(HostCmd_CMD_AMSDU_AGGR_CTRL);
    cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_amsdu_aggr_ctrl)
                + S_DS_GEN);
    amsdu_ctrl->action = cpu_to_le16(action);
    switch (action) {
    case HostCmd_ACT_GEN_SET:
        amsdu_ctrl->enable = cpu_to_le16(aa_ctrl->enable);
        amsdu_ctrl->curr_buf_size = 0;
        break;
    case HostCmd_ACT_GEN_GET:
    default:
        amsdu_ctrl->curr_buf_size = 0;
        break;
    }
    return 0;
}

/*
 * This function prepares 11n configuration command.
 *
 * Preparation includes -
 *      - Setting command ID, action and proper size
 *      - Setting HT Tx capability and HT Tx information fields
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_cfg(struct host_cmd_ds_command *cmd, u16 cmd_action,
            struct mwifiex_ds_11n_tx_cfg *txcfg)
{
    struct host_cmd_ds_11n_cfg *htcfg = &cmd->params.htcfg;

    cmd->command = cpu_to_le16(HostCmd_CMD_11N_CFG);
    cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_11n_cfg) + S_DS_GEN);
    htcfg->action = cpu_to_le16(cmd_action);
    htcfg->ht_tx_cap = cpu_to_le16(txcfg->tx_htcap);
    htcfg->ht_tx_info = cpu_to_le16(txcfg->tx_htinfo);
    return 0;
}

/*
 * This function appends an 11n TLV to a buffer.
 *
 * Buffer allocation is responsibility of the calling
 * function. No size validation is made here.
 *
 * The function fills up the following sections, if applicable -
 *      - HT capability IE
 *      - HT information IE (with channel list)
 *      - 20/40 BSS Coexistence IE
 *      - HT Extended Capabilities IE
 */
int
mwifiex_cmd_append_11n_tlv(struct mwifiex_private *priv,
               struct mwifiex_bssdescriptor *bss_desc,
               u8 **buffer)
{
    struct mwifiex_ie_types_htcap *ht_cap;
    struct mwifiex_ie_types_htinfo *ht_info;
    struct mwifiex_ie_types_chan_list_param_set *chan_list;
    struct mwifiex_ie_types_2040bssco *bss_co_2040;
    struct mwifiex_ie_types_extcap *ext_cap;
    int ret_len = 0;
    struct ieee80211_supported_band *sband;
    u8 radio_type;

    if (!buffer || !*buffer)
        return ret_len;

    radio_type = mwifiex_band_to_radio_type((u8) bss_desc->bss_band);
    sband = priv->wdev->wiphy->bands[radio_type];

    if (bss_desc->bcn_ht_cap) {
        ht_cap = (struct mwifiex_ie_types_htcap *) *buffer;
        memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
        ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
        ht_cap->header.len =
                cpu_to_le16(sizeof(struct ieee80211_ht_cap));
        memcpy((u8 *) ht_cap + sizeof(struct mwifiex_ie_types_header),
               (u8 *) bss_desc->bcn_ht_cap +
               sizeof(struct ieee_types_header),
               le16_to_cpu(ht_cap->header.len));

        mwifiex_fill_cap_info(priv, radio_type, ht_cap);

        *buffer += sizeof(struct mwifiex_ie_types_htcap);
        ret_len += sizeof(struct mwifiex_ie_types_htcap);
    }

    if (bss_desc->bcn_ht_oper) {
        if (priv->bss_mode == NL80211_IFTYPE_ADHOC) {
            ht_info = (struct mwifiex_ie_types_htinfo *) *buffer;
            memset(ht_info, 0,
                   sizeof(struct mwifiex_ie_types_htinfo));
            ht_info->header.type =
                    cpu_to_le16(WLAN_EID_HT_OPERATION);
            ht_info->header.len =
                cpu_to_le16(
                    sizeof(struct ieee80211_ht_operation));

            memcpy((u8 *) ht_info +
                   sizeof(struct mwifiex_ie_types_header),
                   (u8 *) bss_desc->bcn_ht_oper +
                   sizeof(struct ieee_types_header),
                   le16_to_cpu(ht_info->header.len));

            if (!(sband->ht_cap.cap &
                    IEEE80211_HT_CAP_SUP_WIDTH_20_40))
                ht_info->ht_oper.ht_param &=
                    ~(IEEE80211_HT_PARAM_CHAN_WIDTH_ANY |
                    IEEE80211_HT_PARAM_CHA_SEC_OFFSET);

            *buffer += sizeof(struct mwifiex_ie_types_htinfo);
            ret_len += sizeof(struct mwifiex_ie_types_htinfo);
        }

        chan_list =
            (struct mwifiex_ie_types_chan_list_param_set *) *buffer;
        memset(chan_list, 0,
               sizeof(struct mwifiex_ie_types_chan_list_param_set));
        chan_list->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
        chan_list->header.len = cpu_to_le16(
            sizeof(struct mwifiex_ie_types_chan_list_param_set) -
            sizeof(struct mwifiex_ie_types_header));
        chan_list->chan_scan_param[0].chan_number =
            bss_desc->bcn_ht_oper->primary_chan;
        chan_list->chan_scan_param[0].radio_type =
            mwifiex_band_to_radio_type((u8) bss_desc->bss_band);

        if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
            bss_desc->bcn_ht_oper->ht_param &
            IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)
            SET_SECONDARYCHAN(chan_list->chan_scan_param[0].
                      radio_type,
                      (bss_desc->bcn_ht_oper->ht_param &
                      IEEE80211_HT_PARAM_CHA_SEC_OFFSET));

        *buffer += sizeof(struct mwifiex_ie_types_chan_list_param_set);
        ret_len += sizeof(struct mwifiex_ie_types_chan_list_param_set);
    }

    if (bss_desc->bcn_bss_co_2040) {
        bss_co_2040 = (struct mwifiex_ie_types_2040bssco *) *buffer;
        memset(bss_co_2040, 0,
               sizeof(struct mwifiex_ie_types_2040bssco));
        bss_co_2040->header.type = cpu_to_le16(WLAN_EID_BSS_COEX_2040);
        bss_co_2040->header.len =
               cpu_to_le16(sizeof(bss_co_2040->bss_co_2040));

        memcpy((u8 *) bss_co_2040 +
               sizeof(struct mwifiex_ie_types_header),
               bss_desc->bcn_bss_co_2040 +
               sizeof(struct ieee_types_header),
               le16_to_cpu(bss_co_2040->header.len));

        *buffer += sizeof(struct mwifiex_ie_types_2040bssco);
        ret_len += sizeof(struct mwifiex_ie_types_2040bssco);
    }

    if (bss_desc->bcn_ext_cap) {
        ext_cap = (struct mwifiex_ie_types_extcap *) *buffer;
        memset(ext_cap, 0, sizeof(struct mwifiex_ie_types_extcap));
        ext_cap->header.type = cpu_to_le16(WLAN_EID_EXT_CAPABILITY);
        ext_cap->header.len = cpu_to_le16(sizeof(ext_cap->ext_cap));

        memcpy((u8 *)ext_cap + sizeof(struct mwifiex_ie_types_header),
               bss_desc->bcn_ext_cap + sizeof(struct ieee_types_header),
               le16_to_cpu(ext_cap->header.len));

        *buffer += sizeof(struct mwifiex_ie_types_extcap);
        ret_len += sizeof(struct mwifiex_ie_types_extcap);
    }

    return ret_len;
}

/*
 * This function reconfigures the Tx buffer size in firmware.
 *
 * This function prepares a firmware command and issues it, if
 * the current Tx buffer size is different from the one requested.
 * Maximum configurable Tx buffer size is limited by the HT capability
 * field value.
 */
void
mwifiex_cfg_tx_buf(struct mwifiex_private *priv,
           struct mwifiex_bssdescriptor *bss_desc)
{
    u16 max_amsdu = MWIFIEX_TX_DATA_BUF_SIZE_2K;
    u16 tx_buf, curr_tx_buf_size = 0;

    if (bss_desc->bcn_ht_cap) {
        if (le16_to_cpu(bss_desc->bcn_ht_cap->cap_info) &
                IEEE80211_HT_CAP_MAX_AMSDU)
            max_amsdu = MWIFIEX_TX_DATA_BUF_SIZE_8K;
        else
            max_amsdu = MWIFIEX_TX_DATA_BUF_SIZE_4K;
    }

    tx_buf = min(priv->adapter->max_tx_buf_size, max_amsdu);

    dev_dbg(priv->adapter->dev, "info: max_amsdu=%d, max_tx_buf=%d\n",
        max_amsdu, priv->adapter->max_tx_buf_size);

    if (priv->adapter->curr_tx_buf_size <= MWIFIEX_TX_DATA_BUF_SIZE_2K)
        curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
    else if (priv->adapter->curr_tx_buf_size <= MWIFIEX_TX_DATA_BUF_SIZE_4K)
        curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_4K;
    else if (priv->adapter->curr_tx_buf_size <= MWIFIEX_TX_DATA_BUF_SIZE_8K)
        curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_8K;
    if (curr_tx_buf_size != tx_buf)
        mwifiex_send_cmd_async(priv, HostCmd_CMD_RECONFIGURE_TX_BUFF,
                       HostCmd_ACT_GEN_SET, 0, &tx_buf);
}

/*
 * This function checks if the given pointer is valid entry of
 * Tx BA Stream table.
 */
static int mwifiex_is_tx_ba_stream_ptr_valid(struct mwifiex_private *priv,
                struct mwifiex_tx_ba_stream_tbl *tx_tbl_ptr)
{
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tsr_tbl;

    list_for_each_entry(tx_ba_tsr_tbl, &priv->tx_ba_stream_tbl_ptr, list) {
        if (tx_ba_tsr_tbl == tx_tbl_ptr)
            return true;
    }

    return false;
}

/*
 * This function deletes the given entry in Tx BA Stream table.
 *
 * The function also performs a validity check on the supplied
 * pointer before trying to delete.
 */
void mwifiex_11n_delete_tx_ba_stream_tbl_entry(struct mwifiex_private *priv,
                struct mwifiex_tx_ba_stream_tbl *tx_ba_tsr_tbl)
{
    if (!tx_ba_tsr_tbl &&
        mwifiex_is_tx_ba_stream_ptr_valid(priv, tx_ba_tsr_tbl))
        return;

    dev_dbg(priv->adapter->dev, "info: tx_ba_tsr_tbl %p\n", tx_ba_tsr_tbl);

    list_del(&tx_ba_tsr_tbl->list);

    kfree(tx_ba_tsr_tbl);
}

/*
 * This function deletes all the entries in Tx BA Stream table.
 */
void mwifiex_11n_delete_all_tx_ba_stream_tbl(struct mwifiex_private *priv)
{
    int i;
    struct mwifiex_tx_ba_stream_tbl *del_tbl_ptr, *tmp_node;
    unsigned long flags;

    spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
    list_for_each_entry_safe(del_tbl_ptr, tmp_node,
                 &priv->tx_ba_stream_tbl_ptr, list)
        mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, del_tbl_ptr);
    spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);

    INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);

    for (i = 0; i < MAX_NUM_TID; ++i)
        priv->aggr_prio_tbl[i].ampdu_ap =
            priv->aggr_prio_tbl[i].ampdu_user;
}

/*
 * This function returns the pointer to an entry in BA Stream
 * table which matches the given RA/TID pair.
 */
struct mwifiex_tx_ba_stream_tbl *
mwifiex_get_ba_tbl(struct mwifiex_private *priv, int tid, u8 *ra)
{
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tsr_tbl;
    unsigned long flags;

    spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
    list_for_each_entry(tx_ba_tsr_tbl, &priv->tx_ba_stream_tbl_ptr, list) {
        if (!memcmp(tx_ba_tsr_tbl->ra, ra, ETH_ALEN) &&
            tx_ba_tsr_tbl->tid == tid) {
            spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock,
                           flags);
            return tx_ba_tsr_tbl;
        }
    }
    spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
    return NULL;
}

/*
 * This function creates an entry in Tx BA stream table for the
 * given RA/TID pair.
 */
void mwifiex_create_ba_tbl(struct mwifiex_private *priv, u8 *ra, int tid,
               enum mwifiex_ba_status ba_status)
{
    struct mwifiex_tx_ba_stream_tbl *new_node;
    unsigned long flags;

    if (!mwifiex_get_ba_tbl(priv, tid, ra)) {
        new_node = kzalloc(sizeof(struct mwifiex_tx_ba_stream_tbl),
                   GFP_ATOMIC);
        if (!new_node) {
            dev_err(priv->adapter->dev,
                "%s: failed to alloc new_node\n", __func__);
            return;
        }

        INIT_LIST_HEAD(&new_node->list);

        new_node->tid = tid;
        new_node->ba_status = ba_status;
        memcpy(new_node->ra, ra, ETH_ALEN);

        spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
        list_add_tail(&new_node->list, &priv->tx_ba_stream_tbl_ptr);
        spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
    }
}

/*
 * This function sends an add BA request to the given TID/RA pair.
 */
int mwifiex_send_addba(struct mwifiex_private *priv, int tid, u8 *peer_mac)
{
    struct host_cmd_ds_11n_addba_req add_ba_req;
    static u8 dialog_tok;
    int ret;

    dev_dbg(priv->adapter->dev, "cmd: %s: tid %d\n", __func__, tid);

    add_ba_req.block_ack_param_set = cpu_to_le16(
        (u16) ((tid << BLOCKACKPARAM_TID_POS) |
             (priv->add_ba_param.
              tx_win_size << BLOCKACKPARAM_WINSIZE_POS) |
             IMMEDIATE_BLOCK_ACK));
    add_ba_req.block_ack_tmo = cpu_to_le16((u16)priv->add_ba_param.timeout);

    ++dialog_tok;

    if (dialog_tok == 0)
        dialog_tok = 1;

    add_ba_req.dialog_token = dialog_tok;
    memcpy(&add_ba_req.peer_mac_addr, peer_mac, ETH_ALEN);

    /* We don't wait for the response of this command */
    ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_ADDBA_REQ,
                     0, 0, &add_ba_req);

    return ret;
}

/*
 * This function sends a delete BA request to the given TID/RA pair.
 */
int mwifiex_send_delba(struct mwifiex_private *priv, int tid, u8 *peer_mac,
               int initiator)
{
    struct host_cmd_ds_11n_delba delba;
    int ret;
    uint16_t del_ba_param_set;

    memset(&delba, 0, sizeof(delba));
    delba.del_ba_param_set = cpu_to_le16(tid << DELBA_TID_POS);

    del_ba_param_set = le16_to_cpu(delba.del_ba_param_set);
    if (initiator)
        del_ba_param_set |= IEEE80211_DELBA_PARAM_INITIATOR_MASK;
    else
        del_ba_param_set &= ~IEEE80211_DELBA_PARAM_INITIATOR_MASK;

    memcpy(&delba.peer_mac_addr, peer_mac, ETH_ALEN);

    /* We don't wait for the response of this command */
    ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_DELBA,
                     HostCmd_ACT_GEN_SET, 0, &delba);

    return ret;
}

/*
 * This function handles the command response of a delete BA request.
 */
void mwifiex_11n_delete_ba_stream(struct mwifiex_private *priv, u8 *del_ba)
{
    struct host_cmd_ds_11n_delba *cmd_del_ba =
        (struct host_cmd_ds_11n_delba *) del_ba;
    uint16_t del_ba_param_set = le16_to_cpu(cmd_del_ba->del_ba_param_set);
    int tid;

    tid = del_ba_param_set >> DELBA_TID_POS;

    mwifiex_del_ba_tbl(priv, tid, cmd_del_ba->peer_mac_addr,
               TYPE_DELBA_RECEIVE, INITIATOR_BIT(del_ba_param_set));
}

/*
 * This function retrieves the Rx reordering table.
 */
int mwifiex_get_rx_reorder_tbl(struct mwifiex_private *priv,
                   struct mwifiex_ds_rx_reorder_tbl *buf)
{
    int i;
    struct mwifiex_ds_rx_reorder_tbl *rx_reo_tbl = buf;
    struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr;
    int count = 0;
    unsigned long flags;

    spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
    list_for_each_entry(rx_reorder_tbl_ptr, &priv->rx_reorder_tbl_ptr,
                list) {
        rx_reo_tbl->tid = (u16) rx_reorder_tbl_ptr->tid;
        memcpy(rx_reo_tbl->ta, rx_reorder_tbl_ptr->ta, ETH_ALEN);
        rx_reo_tbl->start_win = rx_reorder_tbl_ptr->start_win;
        rx_reo_tbl->win_size = rx_reorder_tbl_ptr->win_size;
        for (i = 0; i < rx_reorder_tbl_ptr->win_size; ++i) {
            if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
                rx_reo_tbl->buffer[i] = true;
            else
                rx_reo_tbl->buffer[i] = false;
        }
        rx_reo_tbl++;
        count++;

        if (count >= MWIFIEX_MAX_RX_BASTREAM_SUPPORTED)
            break;
    }
    spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

    return count;
}

/*
 * This function retrieves the Tx BA stream table.
 */
int mwifiex_get_tx_ba_stream_tbl(struct mwifiex_private *priv,
                 struct mwifiex_ds_tx_ba_stream_tbl *buf)
{
    struct mwifiex_tx_ba_stream_tbl *tx_ba_tsr_tbl;
    struct mwifiex_ds_tx_ba_stream_tbl *rx_reo_tbl = buf;
    int count = 0;
    unsigned long flags;

    spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
    list_for_each_entry(tx_ba_tsr_tbl, &priv->tx_ba_stream_tbl_ptr, list) {
        rx_reo_tbl->tid = (u16) tx_ba_tsr_tbl->tid;
        dev_dbg(priv->adapter->dev, "data: %s tid=%d\n",
            __func__, rx_reo_tbl->tid);
        memcpy(rx_reo_tbl->ra, tx_ba_tsr_tbl->ra, ETH_ALEN);
        rx_reo_tbl++;
        count++;
        if (count >= MWIFIEX_MAX_TX_BASTREAM_SUPPORTED)
            break;
    }
    spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);

    return count;
}

/*
 * This function retrieves the entry for specific tx BA stream table by RA and
 * deletes it.
 */
void mwifiex_del_tx_ba_stream_tbl_by_ra(struct mwifiex_private *priv, u8 *ra)
{
    struct mwifiex_tx_ba_stream_tbl *tbl, *tmp;
    unsigned long flags;

    if (!ra)
        return;

    spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
    list_for_each_entry_safe(tbl, tmp, &priv->tx_ba_stream_tbl_ptr, list) {
        if (!memcmp(tbl->ra, ra, ETH_ALEN)) {
            spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock,
                           flags);
            mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, tbl);
            spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
        }
    }
    spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);

    return;
}