Merge tag 'for-linus-20141102' of git://git.infradead.org/linux-mtd

[mirror_ubuntu-bionic-kernel.git] / drivers / net / wireless / mwifiex / 11n_rxreorder.c

/*
 * Marvell Wireless LAN device driver: 802.11n RX Re-ordering
 *
 * Copyright (C) 2011-2014, 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"
#include "11n_rxreorder.h"

/* This function will dispatch amsdu packet and forward it to kernel/upper
 * layer.
 */
static int mwifiex_11n_dispatch_amsdu_pkt(struct mwifiex_private *priv,
                                          struct sk_buff *skb)
{
        struct rxpd *local_rx_pd = (struct rxpd *)(skb->data);
        int ret;

        if (le16_to_cpu(local_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
                struct sk_buff_head list;
                struct sk_buff *rx_skb;

                __skb_queue_head_init(&list);

                skb_pull(skb, le16_to_cpu(local_rx_pd->rx_pkt_offset));
                skb_trim(skb, le16_to_cpu(local_rx_pd->rx_pkt_length));

                ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
                                         priv->wdev->iftype, 0, false);

                while (!skb_queue_empty(&list)) {
                        rx_skb = __skb_dequeue(&list);
                        ret = mwifiex_recv_packet(priv, rx_skb);
                        if (ret == -1)
                                dev_err(priv->adapter->dev,
                                        "Rx of A-MSDU failed");
                }
                return 0;
        }

        return -1;
}

/* This function will process the rx packet and forward it to kernel/upper
 * layer.
 */
static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
{
        int ret = mwifiex_11n_dispatch_amsdu_pkt(priv, payload);

        if (!ret)
                return 0;

        if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
                return mwifiex_handle_uap_rx_forward(priv, payload);

        return mwifiex_process_rx_packet(priv, payload);
}

/*
 * This function dispatches all packets in the Rx reorder table until the
 * start window.
 *
 * There could be holes in the buffer, which are skipped by the function.
 * Since the buffer is linear, the function uses rotation to simulate
 * circular buffer.
 */
static void
mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
                                         struct mwifiex_rx_reorder_tbl *tbl,
                                         int start_win)
{
        int pkt_to_send, i;
        void *rx_tmp_ptr;
        unsigned long flags;

        pkt_to_send = (start_win > tbl->start_win) ?
                      min((start_win - tbl->start_win), tbl->win_size) :
                      tbl->win_size;

        for (i = 0; i < pkt_to_send; ++i) {
                spin_lock_irqsave(&priv->rx_pkt_lock, flags);
                rx_tmp_ptr = NULL;
                if (tbl->rx_reorder_ptr[i]) {
                        rx_tmp_ptr = tbl->rx_reorder_ptr[i];
                        tbl->rx_reorder_ptr[i] = NULL;
                }
                spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
                if (rx_tmp_ptr)
                        mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
        }

        spin_lock_irqsave(&priv->rx_pkt_lock, flags);
        /*
         * We don't have a circular buffer, hence use rotation to simulate
         * circular buffer
         */
        for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
                tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
                tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
        }

        tbl->start_win = start_win;
        spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
}

/*
 * This function dispatches all packets in the Rx reorder table until
 * a hole is found.
 *
 * The start window is adjusted automatically when a hole is located.
 * Since the buffer is linear, the function uses rotation to simulate
 * circular buffer.
 */
static void
mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
                              struct mwifiex_rx_reorder_tbl *tbl)
{
        int i, j, xchg;
        void *rx_tmp_ptr;
        unsigned long flags;

        for (i = 0; i < tbl->win_size; ++i) {
                spin_lock_irqsave(&priv->rx_pkt_lock, flags);
                if (!tbl->rx_reorder_ptr[i]) {
                        spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
                        break;
                }
                rx_tmp_ptr = tbl->rx_reorder_ptr[i];
                tbl->rx_reorder_ptr[i] = NULL;
                spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
                mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
        }

        spin_lock_irqsave(&priv->rx_pkt_lock, flags);
        /*
         * We don't have a circular buffer, hence use rotation to simulate
         * circular buffer
         */
        if (i > 0) {
                xchg = tbl->win_size - i;
                for (j = 0; j < xchg; ++j) {
                        tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
                        tbl->rx_reorder_ptr[i + j] = NULL;
                }
        }
        tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
        spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
}

/*
 * This function deletes the Rx reorder table and frees the memory.
 *
 * The function stops the associated timer and dispatches all the
 * pending packets in the Rx reorder table before deletion.
 */
static void
mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
                             struct mwifiex_rx_reorder_tbl *tbl)
{
        unsigned long flags;
        int start_win;

        if (!tbl)
                return;

        spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
        priv->adapter->rx_locked = true;
        if (priv->adapter->rx_processing) {
                spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
                flush_workqueue(priv->adapter->rx_workqueue);
        } else {
                spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
        }

        start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
        mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);

        del_timer_sync(&tbl->timer_context.timer);
        tbl->timer_context.timer_is_set = false;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        list_del(&tbl->list);
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

        kfree(tbl->rx_reorder_ptr);
        kfree(tbl);

        spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
        priv->adapter->rx_locked = false;
        spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);

}

/*
 * This function returns the pointer to an entry in Rx reordering
 * table which matches the given TA/TID pair.
 */
struct mwifiex_rx_reorder_tbl *
mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
{
        struct mwifiex_rx_reorder_tbl *tbl;
        unsigned long flags;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
                if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
                        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
                                               flags);
                        return tbl;
                }
        }
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

        return NULL;
}

/* This function retrieves the pointer to an entry in Rx reordering
 * table which matches the given TA and deletes it.
 */
void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
{
        struct mwifiex_rx_reorder_tbl *tbl, *tmp;
        unsigned long flags;

        if (!ta)
                return;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
                if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
                        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
                                               flags);
                        mwifiex_del_rx_reorder_entry(priv, tbl);
                        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
                }
        }
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

        return;
}

/*
 * This function finds the last sequence number used in the packets
 * buffered in Rx reordering table.
 */
static int
mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
{
        struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
        struct mwifiex_private *priv = ctx->priv;
        unsigned long flags;
        int i;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
                if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
                        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
                                               flags);
                        return i;
                }
        }
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

        return -1;
}

/*
 * This function flushes all the packets in Rx reordering table.
 *
 * The function checks if any packets are currently buffered in the
 * table or not. In case there are packets available, it dispatches
 * them and then dumps the Rx reordering table.
 */
static void
mwifiex_flush_data(unsigned long context)
{
        struct reorder_tmr_cnxt *ctx =
                (struct reorder_tmr_cnxt *) context;
        int start_win, seq_num;

        ctx->timer_is_set = false;
        seq_num = mwifiex_11n_find_last_seq_num(ctx);

        if (seq_num < 0)
                return;

        dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", seq_num);
        start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
        mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
                                                 start_win);
}

/*
 * This function creates an entry in Rx reordering table for the
 * given TA/TID.
 *
 * The function also initializes the entry with sequence number, window
 * size as well as initializes the timer.
 *
 * If the received TA/TID pair is already present, all the packets are
 * dispatched and the window size is moved until the SSN.
 */
static void
mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
                                  int tid, int win_size, int seq_num)
{
        int i;
        struct mwifiex_rx_reorder_tbl *tbl, *new_node;
        u16 last_seq = 0;
        unsigned long flags;
        struct mwifiex_sta_node *node;

        /*
         * If we get a TID, ta pair which is already present dispatch all the
         * the packets and move the window size until the ssn
         */
        tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
        if (tbl) {
                mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
                return;
        }
        /* if !tbl then create one */
        new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
        if (!new_node)
                return;

        INIT_LIST_HEAD(&new_node->list);
        new_node->tid = tid;
        memcpy(new_node->ta, ta, ETH_ALEN);
        new_node->start_win = seq_num;
        new_node->init_win = seq_num;
        new_node->flags = 0;

        if (mwifiex_queuing_ra_based(priv)) {
                dev_dbg(priv->adapter->dev,
                        "info: AP/ADHOC:last_seq=%d start_win=%d\n",
                        last_seq, new_node->start_win);
                if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
                        node = mwifiex_get_sta_entry(priv, ta);
                        if (node)
                                last_seq = node->rx_seq[tid];
                }
        } else {
                node = mwifiex_get_sta_entry(priv, ta);
                if (node)
                        last_seq = node->rx_seq[tid];
                else
                        last_seq = priv->rx_seq[tid];
        }

        if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
            last_seq >= new_node->start_win) {
                new_node->start_win = last_seq + 1;
                new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
        }

        new_node->win_size = win_size;

        new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
                                        GFP_KERNEL);
        if (!new_node->rx_reorder_ptr) {
                kfree((u8 *) new_node);
                dev_err(priv->adapter->dev,
                        "%s: failed to alloc reorder_ptr\n", __func__);
                return;
        }

        new_node->timer_context.ptr = new_node;
        new_node->timer_context.priv = priv;
        new_node->timer_context.timer_is_set = false;

        init_timer(&new_node->timer_context.timer);
        new_node->timer_context.timer.function = mwifiex_flush_data;
        new_node->timer_context.timer.data =
                        (unsigned long) &new_node->timer_context;

        for (i = 0; i < win_size; ++i)
                new_node->rx_reorder_ptr[i] = NULL;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
}

static void
mwifiex_11n_rxreorder_timer_restart(struct mwifiex_rx_reorder_tbl *tbl)
{
        u32 min_flush_time;

        if (tbl->win_size >= MWIFIEX_BA_WIN_SIZE_32)
                min_flush_time = MIN_FLUSH_TIMER_15_MS;
        else
                min_flush_time = MIN_FLUSH_TIMER_MS;

        mod_timer(&tbl->timer_context.timer,
                  jiffies + msecs_to_jiffies(min_flush_time * tbl->win_size));

        tbl->timer_context.timer_is_set = true;
}

/*
 * This function prepares command for adding a BA request.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting add BA request buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
{
        struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;

        cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
        cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
        memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));

        return 0;
}

/*
 * This function prepares command for adding a BA response.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting add BA response buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
                                  struct host_cmd_ds_command *cmd,
                                  struct host_cmd_ds_11n_addba_req
                                  *cmd_addba_req)
{
        struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
        struct mwifiex_sta_node *sta_ptr;
        u32 rx_win_size = priv->add_ba_param.rx_win_size;
        u8 tid;
        int win_size;
        uint16_t block_ack_param_set;

        if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
            ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
            priv->adapter->is_hw_11ac_capable &&
            memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
                sta_ptr = mwifiex_get_sta_entry(priv,
                                                cmd_addba_req->peer_mac_addr);
                if (!sta_ptr) {
                        dev_warn(priv->adapter->dev,
                                 "BA setup with unknown TDLS peer %pM!\n",
                                 cmd_addba_req->peer_mac_addr);
                        return -1;
                }
                if (sta_ptr->is_11ac_enabled)
                        rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
        }

        cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
        cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);

        memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
               ETH_ALEN);
        add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
        add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
        add_ba_rsp->ssn = cmd_addba_req->ssn;

        block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
        tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
                >> BLOCKACKPARAM_TID_POS;
        add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
        block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;

        /* If we don't support AMSDU inside AMPDU, reset the bit */
        if (!priv->add_ba_param.rx_amsdu ||
            (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
                block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
        block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
        add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
        win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
                                        & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
                                        >> BLOCKACKPARAM_WINSIZE_POS;
        cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);

        mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
                                          tid, win_size,
                                          le16_to_cpu(cmd_addba_req->ssn));
        return 0;
}

/*
 * This function prepares command for deleting a BA request.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting del BA request buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
{
        struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;

        cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
        cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
        memcpy(del_ba, data_buf, sizeof(*del_ba));

        return 0;
}

/*
 * This function identifies if Rx reordering is needed for a received packet.
 *
 * In case reordering is required, the function will do the reordering
 * before sending it to kernel.
 *
 * The Rx reorder table is checked first with the received TID/TA pair. If
 * not found, the received packet is dispatched immediately. But if found,
 * the packet is reordered and all the packets in the updated Rx reordering
 * table is dispatched until a hole is found.
 *
 * For sequence number less than the starting window, the packet is dropped.
 */
int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
                                u16 seq_num, u16 tid,
                                u8 *ta, u8 pkt_type, void *payload)
{
        struct mwifiex_rx_reorder_tbl *tbl;
        int prev_start_win, start_win, end_win, win_size;
        u16 pkt_index;
        bool init_window_shift = false;
        int ret = 0;

        tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
        if (!tbl) {
                if (pkt_type != PKT_TYPE_BAR)
                        mwifiex_11n_dispatch_pkt(priv, payload);
                return ret;
        }

        if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
                mwifiex_11n_dispatch_pkt(priv, payload);
                return ret;
        }

        start_win = tbl->start_win;
        prev_start_win = start_win;
        win_size = tbl->win_size;
        end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
        if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
                init_window_shift = true;
                tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
        }

        if (tbl->flags & RXREOR_FORCE_NO_DROP) {
                dev_dbg(priv->adapter->dev,
                        "RXREOR_FORCE_NO_DROP when HS is activated\n");
                tbl->flags &= ~RXREOR_FORCE_NO_DROP;
        } else if (init_window_shift && seq_num < start_win &&
                   seq_num >= tbl->init_win) {
                dev_dbg(priv->adapter->dev,
                        "Sender TID sequence number reset %d->%d for SSN %d\n",
                        start_win, seq_num, tbl->init_win);
                tbl->start_win = start_win = seq_num;
                end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
        } else {
                /*
                 * If seq_num is less then starting win then ignore and drop
                 * the packet
                 */
                if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
                        if (seq_num >= ((start_win + TWOPOW11) &
                                        (MAX_TID_VALUE - 1)) &&
                            seq_num < start_win) {
                                ret = -1;
                                goto done;
                        }
                } else if ((seq_num < start_win) ||
                           (seq_num >= (start_win + TWOPOW11))) {
                        ret = -1;
                        goto done;
                }
        }

        /*
         * If this packet is a BAR we adjust seq_num as
         * WinStart = seq_num
         */
        if (pkt_type == PKT_TYPE_BAR)
                seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);

        if (((end_win < start_win) &&
             (seq_num < start_win) && (seq_num > end_win)) ||
            ((end_win > start_win) && ((seq_num > end_win) ||
                                       (seq_num < start_win)))) {
                end_win = seq_num;
                if (((seq_num - win_size) + 1) >= 0)
                        start_win = (end_win - win_size) + 1;
                else
                        start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
                mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
        }

        if (pkt_type != PKT_TYPE_BAR) {
                if (seq_num >= start_win)
                        pkt_index = seq_num - start_win;
                else
                        pkt_index = (seq_num+MAX_TID_VALUE) - start_win;

                if (tbl->rx_reorder_ptr[pkt_index]) {
                        ret = -1;
                        goto done;
                }

                tbl->rx_reorder_ptr[pkt_index] = payload;
        }

        /*
         * Dispatch all packets sequentially from start_win until a
         * hole is found and adjust the start_win appropriately
         */
        mwifiex_11n_scan_and_dispatch(priv, tbl);

done:
        if (!tbl->timer_context.timer_is_set ||
            prev_start_win != tbl->start_win)
                mwifiex_11n_rxreorder_timer_restart(tbl);
        return ret;
}

/*
 * This function deletes an entry for a given TID/TA pair.
 *
 * The TID/TA are taken from del BA event body.
 */
void
mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
                   u8 type, int initiator)
{
        struct mwifiex_rx_reorder_tbl *tbl;
        struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
        u8 cleanup_rx_reorder_tbl;
        unsigned long flags;

        if (type == TYPE_DELBA_RECEIVE)
                cleanup_rx_reorder_tbl = (initiator) ? true : false;
        else
                cleanup_rx_reorder_tbl = (initiator) ? false : true;

        dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
                peer_mac, tid, initiator);

        if (cleanup_rx_reorder_tbl) {
                tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
                                                                 peer_mac);
                if (!tbl) {
                        dev_dbg(priv->adapter->dev,
                                "event: TID, TA not found in table\n");
                        return;
                }
                mwifiex_del_rx_reorder_entry(priv, tbl);
        } else {
                ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
                if (!ptx_tbl) {
                        dev_dbg(priv->adapter->dev,
                                "event: TID, RA not found in table\n");
                        return;
                }

                spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
                mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
                spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
        }
}

/*
 * This function handles the command response of an add BA response.
 *
 * Handling includes changing the header fields into CPU format and
 * creating the stream, provided the add BA is accepted.
 */
int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
                               struct host_cmd_ds_command *resp)
{
        struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
        int tid, win_size;
        struct mwifiex_rx_reorder_tbl *tbl;
        uint16_t block_ack_param_set;

        block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);

        tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
                >> BLOCKACKPARAM_TID_POS;
        /*
         * Check if we had rejected the ADDBA, if yes then do not create
         * the stream
         */
        if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
                dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
                        add_ba_rsp->peer_mac_addr, tid);

                tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
                                                     add_ba_rsp->peer_mac_addr);
                if (tbl)
                        mwifiex_del_rx_reorder_entry(priv, tbl);

                return 0;
        }

        win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
                    >> BLOCKACKPARAM_WINSIZE_POS;

        tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
                                             add_ba_rsp->peer_mac_addr);
        if (tbl) {
                if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
                    priv->add_ba_param.rx_amsdu &&
                    (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
                        tbl->amsdu = true;
                else
                        tbl->amsdu = false;
        }

        dev_dbg(priv->adapter->dev,
                "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
                add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);

        return 0;
}

/*
 * This function handles BA stream timeout event by preparing and sending
 * a command to the firmware.
 */
void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
                                   struct host_cmd_ds_11n_batimeout *event)
{
        struct host_cmd_ds_11n_delba delba;

        memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
        memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);

        delba.del_ba_param_set |=
                cpu_to_le16((u16) event->tid << DELBA_TID_POS);
        delba.del_ba_param_set |= cpu_to_le16(
                (u16) event->origninator << DELBA_INITIATOR_POS);
        delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
        mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
}

/*
 * This function cleans up the Rx reorder table by deleting all the entries
 * and re-initializing.
 */
void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
{
        struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
        unsigned long flags;

        spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        list_for_each_entry_safe(del_tbl_ptr, tmp_node,
                                 &priv->rx_reorder_tbl_ptr, list) {
                spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
                mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
                spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
        }
        INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

        mwifiex_reset_11n_rx_seq_num(priv);
}

/*
 * This function updates all rx_reorder_tbl's flags.
 */
void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
{
        struct mwifiex_private *priv;
        struct mwifiex_rx_reorder_tbl *tbl;
        unsigned long lock_flags;
        int i;

        for (i = 0; i < adapter->priv_num; i++) {
                priv = adapter->priv[i];
                if (!priv)
                        continue;

                spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
                if (list_empty(&priv->rx_reorder_tbl_ptr)) {
                        spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
                                               lock_flags);
                        continue;
                }

                list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
                        tbl->flags = flags;
                spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
        }

        return;
}