Revert "gma500: Fix dependencies"

[zen-stable.git] / drivers / net / wireless / mwifiex / 11n.c

/*
 * 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_11n_get_tx_ba_stream_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 =
                (struct host_cmd_ds_11n_delba *) &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_11n_delete_ba_stream_tbl(priv, tid,
                                del_ba->peer_mac_addr, TYPE_DELBA_SENT,
                                INITIATOR_BIT(del_ba_param_set));

                tx_ba_tbl = mwifiex_11n_get_tx_ba_stream_status(priv,
                                                BA_STREAM_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)) {
                        mwifiex_11n_create_tx_ba_stream_tbl(priv,
                                        del_ba->peer_mac_addr, tid,
                                        BA_STREAM_SETUP_INPROGRESS);

                        tx_ba_tbl = mwifiex_11n_get_tx_ba_stream_status(priv,
                                        BA_STREAM_SETUP_INPROGRESS);
                        if (tx_ba_tbl)
                                mwifiex_11n_delete_ba_stream_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 =
                (struct host_cmd_ds_11n_addba_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_11n_get_tx_ba_stream_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_STREAM_SETUP_COMPLETE;
                } else {
                        dev_err(priv->adapter->dev, "BA stream not created\n");
                }
        } else {
                mwifiex_11n_delete_ba_stream_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 handles the command response of 11n configuration request.
 *
 * Handling includes changing the header fields into CPU format.
 */
int mwifiex_ret_11n_cfg(struct host_cmd_ds_command *resp, void *data_buf)
{
        struct mwifiex_ds_11n_tx_cfg *tx_cfg;
        struct host_cmd_ds_11n_cfg *htcfg = &resp->params.htcfg;

        if (data_buf) {
                tx_cfg = (struct mwifiex_ds_11n_tx_cfg *) data_buf;
                tx_cfg->tx_htcap = le16_to_cpu(htcfg->ht_tx_cap);
                tx_cfg->tx_htinfo = le16_to_cpu(htcfg->ht_tx_info);
        }
        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,
                             void *data_buf)
{
        struct host_cmd_ds_txbuf_cfg *tx_buf = &cmd->params.tx_buf;
        u16 action = (u16) cmd_action;
        u16 buf_size = *((u16 *) data_buf);

        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, void *data_buf)
{
        struct host_cmd_ds_amsdu_aggr_ctrl *amsdu_ctrl =
                &cmd->params.amsdu_aggr_ctrl;
        u16 action = (u16) cmd_action;
        struct mwifiex_ds_11n_amsdu_aggr_ctrl *aa_ctrl =
                (struct mwifiex_ds_11n_amsdu_aggr_ctrl *) data_buf;

        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 handles the command response of AMSDU aggregation
 * control request.
 *
 * Handling includes changing the header fields into CPU format.
 */
int mwifiex_ret_amsdu_aggr_ctrl(struct host_cmd_ds_command *resp,
                                void *data_buf)
{
        struct mwifiex_ds_11n_amsdu_aggr_ctrl *amsdu_aggr_ctrl;
        struct host_cmd_ds_amsdu_aggr_ctrl *amsdu_ctrl =
                &resp->params.amsdu_aggr_ctrl;

        if (data_buf) {
                amsdu_aggr_ctrl =
                        (struct mwifiex_ds_11n_amsdu_aggr_ctrl *) data_buf;
                amsdu_aggr_ctrl->enable = le16_to_cpu(amsdu_ctrl->enable);
                amsdu_aggr_ctrl->curr_buf_size =
                        le16_to_cpu(amsdu_ctrl->curr_buf_size);
        }
        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, void *data_buf)
{
        struct host_cmd_ds_11n_cfg *htcfg = &cmd->params.htcfg;
        struct mwifiex_ds_11n_tx_cfg *txcfg =
                (struct mwifiex_ds_11n_tx_cfg *) data_buf;

        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_info) {
                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_INFORMATION);
                        ht_info->header.len =
                                cpu_to_le16(sizeof(struct ieee80211_ht_info));

                        memcpy((u8 *) ht_info +
                               sizeof(struct mwifiex_ie_types_header),
                               (u8 *) bss_desc->bcn_ht_info +
                               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_info.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_info->control_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_info->ht_param &
                                IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
                        SET_SECONDARYCHAN(chan_list->chan_scan_param[0].
                                          radio_type,
                                          (bss_desc->bcn_ht_info->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),
                       (u8 *) 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),
                       (u8 *) 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_11n_get_tx_ba_stream_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_11n_create_tx_ba_stream_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_11n_get_tx_ba_stream_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_11n_delete_ba_stream_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;
}