drivers/net/wireless/mwifiex/11n_rxreorder.c

   1 /*
   2  * Marvell Wireless LAN device driver: 802.11n RX Re-ordering
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "wmm.h"
  26 #include "11n.h"
  27 #include "11n_rxreorder.h"
  28
  29 /*
  30  * This function dispatches all packets in the Rx reorder table until the
  31  * start window.
  32  *
  33  * There could be holes in the buffer, which are skipped by the function.
  34  * Since the buffer is linear, the function uses rotation to simulate
  35  * circular buffer.
  36  */
  37 static void
  38 mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv,
  39                          struct mwifiex_rx_reorder_tbl *tbl, int start_win)
  40 {
  41         int pkt_to_send, i;
  42         void *rx_tmp_ptr;
  43         unsigned long flags;
  44
  45         pkt_to_send = (start_win > tbl->start_win) ?
  46                       min((start_win - tbl->start_win), tbl->win_size) :
  47                       tbl->win_size;
  48
  49         for (i = 0; i < pkt_to_send; ++i) {
  50                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  51                 rx_tmp_ptr = NULL;
  52                 if (tbl->rx_reorder_ptr[i]) {
  53                         rx_tmp_ptr = tbl->rx_reorder_ptr[i];
  54                         tbl->rx_reorder_ptr[i] = NULL;
  55                 }
  56                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  57                 if (rx_tmp_ptr)
  58                         mwifiex_process_rx_packet(priv->adapter, rx_tmp_ptr);
  59         }
  60
  61         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  62         /*
  63          * We don't have a circular buffer, hence use rotation to simulate
  64          * circular buffer
  65          */
  66         for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
  67                 tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
  68                 tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
  69         }
  70
  71         tbl->start_win = start_win;
  72         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  73 }
  74
  75 /*
  76  * This function dispatches all packets in the Rx reorder table until
  77  * a hole is found.
  78  *
  79  * The start window is adjusted automatically when a hole is located.
  80  * Since the buffer is linear, the function uses rotation to simulate
  81  * circular buffer.
  82  */
  83 static void
  84 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
  85                               struct mwifiex_rx_reorder_tbl *tbl)
  86 {
  87         int i, j, xchg;
  88         void *rx_tmp_ptr;
  89         unsigned long flags;
  90
  91         for (i = 0; i < tbl->win_size; ++i) {
  92                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  93                 if (!tbl->rx_reorder_ptr[i]) {
  94                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  95                         break;
  96                 }
  97                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
  98                 tbl->rx_reorder_ptr[i] = NULL;
  99                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 100                 mwifiex_process_rx_packet(priv->adapter, rx_tmp_ptr);
 101         }
 102
 103         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 104         /*
 105          * We don't have a circular buffer, hence use rotation to simulate
 106          * circular buffer
 107          */
 108         if (i > 0) {
 109                 xchg = tbl->win_size - i;
 110                 for (j = 0; j < xchg; ++j) {
 111                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 112                         tbl->rx_reorder_ptr[i + j] = NULL;
 113                 }
 114         }
 115         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 116         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 117 }
 118
 119 /*
 120  * This function deletes the Rx reorder table and frees the memory.
 121  *
 122  * The function stops the associated timer and dispatches all the
 123  * pending packets in the Rx reorder table before deletion.
 124  */
 125 static void
 126 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 127                              struct mwifiex_rx_reorder_tbl *tbl)
 128 {
 129         unsigned long flags;
 130
 131         if (!tbl)
 132                 return;
 133
 134         mwifiex_11n_dispatch_pkt(priv, tbl, (tbl->start_win + tbl->win_size) &
 135                                             (MAX_TID_VALUE - 1));
 136
 137         del_timer(&tbl->timer_context.timer);
 138
 139         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 140         list_del(&tbl->list);
 141         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 142
 143         kfree(tbl->rx_reorder_ptr);
 144         kfree(tbl);
 145 }
 146
 147 /*
 148  * This function returns the pointer to an entry in Rx reordering
 149  * table which matches the given TA/TID pair.
 150  */
 151 static struct mwifiex_rx_reorder_tbl *
 152 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 153 {
 154         struct mwifiex_rx_reorder_tbl *tbl;
 155         unsigned long flags;
 156
 157         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 158         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 159                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 160                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 161                                                flags);
 162                         return tbl;
 163                 }
 164         }
 165         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 166
 167         return NULL;
 168 }
 169
 170 /*
 171  * This function finds the last sequence number used in the packets
 172  * buffered in Rx reordering table.
 173  */
 174 static int
 175 mwifiex_11n_find_last_seq_num(struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr)
 176 {
 177         int i;
 178
 179         for (i = (rx_reorder_tbl_ptr->win_size - 1); i >= 0; --i)
 180                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 181                         return i;
 182
 183         return -1;
 184 }
 185
 186 /*
 187  * This function flushes all the packets in Rx reordering table.
 188  *
 189  * The function checks if any packets are currently buffered in the
 190  * table or not. In case there are packets available, it dispatches
 191  * them and then dumps the Rx reordering table.
 192  */
 193 static void
 194 mwifiex_flush_data(unsigned long context)
 195 {
 196         struct reorder_tmr_cnxt *ctx =
 197                 (struct reorder_tmr_cnxt *) context;
 198         int start_win;
 199
 200         start_win = mwifiex_11n_find_last_seq_num(ctx->ptr);
 201
 202         if (start_win < 0)
 203                 return;
 204
 205         dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", start_win);
 206         mwifiex_11n_dispatch_pkt(ctx->priv, ctx->ptr,
 207                                  (ctx->ptr->start_win + start_win + 1) &
 208                                  (MAX_TID_VALUE - 1));
 209 }
 210
 211 /*
 212  * This function creates an entry in Rx reordering table for the
 213  * given TA/TID.
 214  *
 215  * The function also initializes the entry with sequence number, window
 216  * size as well as initializes the timer.
 217  *
 218  * If the received TA/TID pair is already present, all the packets are
 219  * dispatched and the window size is moved until the SSN.
 220  */
 221 static void
 222 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 223                                   int tid, int win_size, int seq_num)
 224 {
 225         int i;
 226         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 227         u16 last_seq = 0;
 228         unsigned long flags;
 229
 230         /*
 231          * If we get a TID, ta pair which is already present dispatch all the
 232          * the packets and move the window size until the ssn
 233          */
 234         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 235         if (tbl) {
 236                 mwifiex_11n_dispatch_pkt(priv, tbl, seq_num);
 237                 return;
 238         }
 239         /* if !tbl then create one */
 240         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 241         if (!new_node) {
 242                 dev_err(priv->adapter->dev, "%s: failed to alloc new_node\n",
 243                         __func__);
 244                 return;
 245         }
 246
 247         INIT_LIST_HEAD(&new_node->list);
 248         new_node->tid = tid;
 249         memcpy(new_node->ta, ta, ETH_ALEN);
 250         new_node->start_win = seq_num;
 251         if (mwifiex_queuing_ra_based(priv))
 252                 /* TODO for adhoc */
 253                 dev_dbg(priv->adapter->dev,
 254                         "info: ADHOC:last_seq=%d start_win=%d\n",
 255                         last_seq, new_node->start_win);
 256         else
 257                 last_seq = priv->rx_seq[tid];
 258
 259         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 260             last_seq >= new_node->start_win)
 261                 new_node->start_win = last_seq + 1;
 262
 263         new_node->win_size = win_size;
 264
 265         new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
 266                                         GFP_KERNEL);
 267         if (!new_node->rx_reorder_ptr) {
 268                 kfree((u8 *) new_node);
 269                 dev_err(priv->adapter->dev,
 270                         "%s: failed to alloc reorder_ptr\n", __func__);
 271                 return;
 272         }
 273
 274         new_node->timer_context.ptr = new_node;
 275         new_node->timer_context.priv = priv;
 276
 277         init_timer(&new_node->timer_context.timer);
 278         new_node->timer_context.timer.function = mwifiex_flush_data;
 279         new_node->timer_context.timer.data =
 280                         (unsigned long) &new_node->timer_context;
 281
 282         for (i = 0; i < win_size; ++i)
 283                 new_node->rx_reorder_ptr[i] = NULL;
 284
 285         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 286         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 287         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 288 }
 289
 290 /*
 291  * This function prepares command for adding a BA request.
 292  *
 293  * Preparation includes -
 294  *      - Setting command ID and proper size
 295  *      - Setting add BA request buffer
 296  *      - Ensuring correct endian-ness
 297  */
 298 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 299 {
 300         struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
 301
 302         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 303         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 304         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * This function prepares command for adding a BA response.
 311  *
 312  * Preparation includes -
 313  *      - Setting command ID and proper size
 314  *      - Setting add BA response buffer
 315  *      - Ensuring correct endian-ness
 316  */
 317 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 318                                   struct host_cmd_ds_command *cmd,
 319                                   struct host_cmd_ds_11n_addba_req
 320                                   *cmd_addba_req)
 321 {
 322         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
 323         u8 tid;
 324         int win_size;
 325         uint16_t block_ack_param_set;
 326
 327         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 328         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 329
 330         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 331                ETH_ALEN);
 332         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 333         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 334         add_ba_rsp->ssn = cmd_addba_req->ssn;
 335
 336         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 337         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 338                 >> BLOCKACKPARAM_TID_POS;
 339         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 340         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 341         /* We donot support AMSDU inside AMPDU, hence reset the bit */
 342         block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 343         block_ack_param_set |= (priv->add_ba_param.rx_win_size <<
 344                                              BLOCKACKPARAM_WINSIZE_POS);
 345         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 346         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 347                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 348                                         >> BLOCKACKPARAM_WINSIZE_POS;
 349         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 350
 351         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 352                                           tid, win_size,
 353                                           le16_to_cpu(cmd_addba_req->ssn));
 354         return 0;
 355 }
 356
 357 /*
 358  * This function prepares command for deleting a BA request.
 359  *
 360  * Preparation includes -
 361  *      - Setting command ID and proper size
 362  *      - Setting del BA request buffer
 363  *      - Ensuring correct endian-ness
 364  */
 365 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 366 {
 367         struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
 368
 369         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 370         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 371         memcpy(del_ba, data_buf, sizeof(*del_ba));
 372
 373         return 0;
 374 }
 375
 376 /*
 377  * This function identifies if Rx reordering is needed for a received packet.
 378  *
 379  * In case reordering is required, the function will do the reordering
 380  * before sending it to kernel.
 381  *
 382  * The Rx reorder table is checked first with the received TID/TA pair. If
 383  * not found, the received packet is dispatched immediately. But if found,
 384  * the packet is reordered and all the packets in the updated Rx reordering
 385  * table is dispatched until a hole is found.
 386  *
 387  * For sequence number less than the starting window, the packet is dropped.
 388  */
 389 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 390                                 u16 seq_num, u16 tid,
 391                                 u8 *ta, u8 pkt_type, void *payload)
 392 {
 393         struct mwifiex_rx_reorder_tbl *tbl;
 394         int start_win, end_win, win_size;
 395         u16 pkt_index;
 396
 397         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 398         if (!tbl) {
 399                 if (pkt_type != PKT_TYPE_BAR)
 400                         mwifiex_process_rx_packet(priv->adapter, payload);
 401                 return 0;
 402         }
 403         start_win = tbl->start_win;
 404         win_size = tbl->win_size;
 405         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 406         del_timer(&tbl->timer_context.timer);
 407         mod_timer(&tbl->timer_context.timer,
 408                   jiffies + (MIN_FLUSH_TIMER_MS * win_size * HZ) / 1000);
 409
 410         /*
 411          * If seq_num is less then starting win then ignore and drop the
 412          * packet
 413          */
 414         if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {/* Wrap */
 415                 if (seq_num >= ((start_win + TWOPOW11) &
 416                                 (MAX_TID_VALUE - 1)) && (seq_num < start_win))
 417                         return -1;
 418         } else if ((seq_num < start_win) ||
 419                    (seq_num > (start_win + TWOPOW11))) {
 420                 return -1;
 421         }
 422
 423         /*
 424          * If this packet is a BAR we adjust seq_num as
 425          * WinStart = seq_num
 426          */
 427         if (pkt_type == PKT_TYPE_BAR)
 428                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 429
 430         if (((end_win < start_win) &&
 431              (seq_num < (TWOPOW11 - (MAX_TID_VALUE - start_win))) &&
 432              (seq_num > end_win)) ||
 433             ((end_win > start_win) && ((seq_num > end_win) ||
 434                                        (seq_num < start_win)))) {
 435                 end_win = seq_num;
 436                 if (((seq_num - win_size) + 1) >= 0)
 437                         start_win = (end_win - win_size) + 1;
 438                 else
 439                         start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
 440                 mwifiex_11n_dispatch_pkt(priv, tbl, start_win);
 441         }
 442
 443         if (pkt_type != PKT_TYPE_BAR) {
 444                 if (seq_num >= start_win)
 445                         pkt_index = seq_num - start_win;
 446                 else
 447                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 448
 449                 if (tbl->rx_reorder_ptr[pkt_index])
 450                         return -1;
 451
 452                 tbl->rx_reorder_ptr[pkt_index] = payload;
 453         }
 454
 455         /*
 456          * Dispatch all packets sequentially from start_win until a
 457          * hole is found and adjust the start_win appropriately
 458          */
 459         mwifiex_11n_scan_and_dispatch(priv, tbl);
 460
 461         return 0;
 462 }
 463
 464 /*
 465  * This function deletes an entry for a given TID/TA pair.
 466  *
 467  * The TID/TA are taken from del BA event body.
 468  */
 469 void
 470 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 471                    u8 type, int initiator)
 472 {
 473         struct mwifiex_rx_reorder_tbl *tbl;
 474         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 475         u8 cleanup_rx_reorder_tbl;
 476         unsigned long flags;
 477
 478         if (type == TYPE_DELBA_RECEIVE)
 479                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 480         else
 481                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 482
 483         dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
 484                 peer_mac, tid, initiator);
 485
 486         if (cleanup_rx_reorder_tbl) {
 487                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 488                                                                  peer_mac);
 489                 if (!tbl) {
 490                         dev_dbg(priv->adapter->dev,
 491                                 "event: TID, TA not found in table\n");
 492                         return;
 493                 }
 494                 mwifiex_del_rx_reorder_entry(priv, tbl);
 495         } else {
 496                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 497                 if (!ptx_tbl) {
 498                         dev_dbg(priv->adapter->dev,
 499                                 "event: TID, RA not found in table\n");
 500                         return;
 501                 }
 502
 503                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 504                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 505                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 506         }
 507 }
 508
 509 /*
 510  * This function handles the command response of an add BA response.
 511  *
 512  * Handling includes changing the header fields into CPU format and
 513  * creating the stream, provided the add BA is accepted.
 514  */
 515 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 516                                struct host_cmd_ds_command *resp)
 517 {
 518         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 519         int tid, win_size;
 520         struct mwifiex_rx_reorder_tbl *tbl;
 521         uint16_t block_ack_param_set;
 522
 523         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 524
 525         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 526                 >> BLOCKACKPARAM_TID_POS;
 527         /*
 528          * Check if we had rejected the ADDBA, if yes then do not create
 529          * the stream
 530          */
 531         if (le16_to_cpu(add_ba_rsp->status_code) == BA_RESULT_SUCCESS) {
 532                 win_size = (block_ack_param_set &
 533                         IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 534                         >> BLOCKACKPARAM_WINSIZE_POS;
 535
 536                 dev_dbg(priv->adapter->dev,
 537                         "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 538                         add_ba_rsp->peer_mac_addr, tid,
 539                         add_ba_rsp->ssn, win_size);
 540         } else {
 541                 dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
 542                         add_ba_rsp->peer_mac_addr, tid);
 543
 544                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 545                                                      add_ba_rsp->peer_mac_addr);
 546                 if (tbl)
 547                         mwifiex_del_rx_reorder_entry(priv, tbl);
 548         }
 549
 550         return 0;
 551 }
 552
 553 /*
 554  * This function handles BA stream timeout event by preparing and sending
 555  * a command to the firmware.
 556  */
 557 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 558                                    struct host_cmd_ds_11n_batimeout *event)
 559 {
 560         struct host_cmd_ds_11n_delba delba;
 561
 562         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 563         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 564
 565         delba.del_ba_param_set |=
 566                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 567         delba.del_ba_param_set |= cpu_to_le16(
 568                 (u16) event->origninator << DELBA_INITIATOR_POS);
 569         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 570         mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba);
 571 }
 572
 573 /*
 574  * This function cleans up the Rx reorder table by deleting all the entries
 575  * and re-initializing.
 576  */
 577 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 578 {
 579         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 580         unsigned long flags;
 581
 582         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 583         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 584                                  &priv->rx_reorder_tbl_ptr, list) {
 585                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 586                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 587                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 588         }
 589         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 590
 591         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 592         mwifiex_reset_11n_rx_seq_num(priv);
 593 }