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.
  31  *
  32  * There could be holes in the buffer, which are skipped by the function.
  33  * Since the buffer is linear, the function uses rotation to simulate
  34  * circular buffer.
  35  */
  36 static int
  37 mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
  38                                          struct mwifiex_rx_reorder_tbl
  39                                          *rx_reor_tbl_ptr, int start_win)
  40 {
  41         int no_pkt_to_send, i;
  42         void *rx_tmp_ptr = NULL;
  43         unsigned long flags;
  44
  45         no_pkt_to_send = (start_win > rx_reor_tbl_ptr->start_win) ?
  46                 min((start_win - rx_reor_tbl_ptr->start_win),
  47                     rx_reor_tbl_ptr->win_size) : rx_reor_tbl_ptr->win_size;
  48
  49         for (i = 0; i < no_pkt_to_send; ++i) {
  50                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  51                 rx_tmp_ptr = NULL;
  52                 if (rx_reor_tbl_ptr->rx_reorder_ptr[i]) {
  53                         rx_tmp_ptr = rx_reor_tbl_ptr->rx_reorder_ptr[i];
  54                         rx_reor_tbl_ptr->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 < rx_reor_tbl_ptr->win_size - no_pkt_to_send; ++i) {
  67                 rx_reor_tbl_ptr->rx_reorder_ptr[i] =
  68                         rx_reor_tbl_ptr->rx_reorder_ptr[no_pkt_to_send + i];
  69                 rx_reor_tbl_ptr->rx_reorder_ptr[no_pkt_to_send + i] = NULL;
  70         }
  71
  72         rx_reor_tbl_ptr->start_win = start_win;
  73         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  74
  75         return 0;
  76 }
  77
  78 /*
  79  * This function dispatches all packets in the Rx reorder table until
  80  * a hole is found.
  81  *
  82  * The start window is adjusted automatically when a hole is located.
  83  * Since the buffer is linear, the function uses rotation to simulate
  84  * circular buffer.
  85  */
  86 static int
  87 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
  88                               struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr)
  89 {
  90         int i, j, xchg;
  91         void *rx_tmp_ptr = NULL;
  92         unsigned long flags;
  93
  94         for (i = 0; i < rx_reor_tbl_ptr->win_size; ++i) {
  95                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  96                 if (!rx_reor_tbl_ptr->rx_reorder_ptr[i]) {
  97                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  98                         break;
  99                 }
 100                 rx_tmp_ptr = rx_reor_tbl_ptr->rx_reorder_ptr[i];
 101                 rx_reor_tbl_ptr->rx_reorder_ptr[i] = NULL;
 102                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 103                 mwifiex_process_rx_packet(priv->adapter, rx_tmp_ptr);
 104         }
 105
 106         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 107         /*
 108          * We don't have a circular buffer, hence use rotation to simulate
 109          * circular buffer
 110          */
 111         if (i > 0) {
 112                 xchg = rx_reor_tbl_ptr->win_size - i;
 113                 for (j = 0; j < xchg; ++j) {
 114                         rx_reor_tbl_ptr->rx_reorder_ptr[j] =
 115                                 rx_reor_tbl_ptr->rx_reorder_ptr[i + j];
 116                         rx_reor_tbl_ptr->rx_reorder_ptr[i + j] = NULL;
 117                 }
 118         }
 119         rx_reor_tbl_ptr->start_win = (rx_reor_tbl_ptr->start_win + i)
 120                 &(MAX_TID_VALUE - 1);
 121         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 122         return 0;
 123 }
 124
 125 /*
 126  * This function deletes the Rx reorder table and frees the memory.
 127  *
 128  * The function stops the associated timer and dispatches all the
 129  * pending packets in the Rx reorder table before deletion.
 130  */
 131 static void
 132 mwifiex_11n_delete_rx_reorder_tbl_entry(struct mwifiex_private *priv,
 133                                        struct mwifiex_rx_reorder_tbl
 134                                        *rx_reor_tbl_ptr)
 135 {
 136         unsigned long flags;
 137
 138         if (!rx_reor_tbl_ptr)
 139                 return;
 140
 141         mwifiex_11n_dispatch_pkt_until_start_win(priv, rx_reor_tbl_ptr,
 142                                                  (rx_reor_tbl_ptr->start_win +
 143                                                   rx_reor_tbl_ptr->win_size)
 144                                                  &(MAX_TID_VALUE - 1));
 145
 146         del_timer(&rx_reor_tbl_ptr->timer_context.timer);
 147
 148         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 149         list_del(&rx_reor_tbl_ptr->list);
 150         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 151
 152         kfree(rx_reor_tbl_ptr->rx_reorder_ptr);
 153         kfree(rx_reor_tbl_ptr);
 154 }
 155
 156 /*
 157  * This function returns the pointer to an entry in Rx reordering
 158  * table which matches the given TA/TID pair.
 159  */
 160 static struct mwifiex_rx_reorder_tbl *
 161 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 162 {
 163         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
 164         unsigned long flags;
 165
 166         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 167         list_for_each_entry(rx_reor_tbl_ptr, &priv->rx_reorder_tbl_ptr, list) {
 168                 if ((!memcmp(rx_reor_tbl_ptr->ta, ta, ETH_ALEN))
 169                     && (rx_reor_tbl_ptr->tid == tid)) {
 170                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 171                                                flags);
 172                         return rx_reor_tbl_ptr;
 173                 }
 174         }
 175         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 176
 177         return NULL;
 178 }
 179
 180 /*
 181  * This function finds the last sequence number used in the packets
 182  * buffered in Rx reordering table.
 183  */
 184 static int
 185 mwifiex_11n_find_last_seq_num(struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr)
 186 {
 187         int i;
 188
 189         for (i = (rx_reorder_tbl_ptr->win_size - 1); i >= 0; --i)
 190                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 191                         return i;
 192
 193         return -1;
 194 }
 195
 196 /*
 197  * This function flushes all the packets in Rx reordering table.
 198  *
 199  * The function checks if any packets are currently buffered in the
 200  * table or not. In case there are packets available, it dispatches
 201  * them and then dumps the Rx reordering table.
 202  */
 203 static void
 204 mwifiex_flush_data(unsigned long context)
 205 {
 206         struct reorder_tmr_cnxt *reorder_cnxt =
 207                 (struct reorder_tmr_cnxt *) context;
 208         int start_win;
 209
 210         start_win = mwifiex_11n_find_last_seq_num(reorder_cnxt->ptr);
 211         if (start_win >= 0) {
 212                 dev_dbg(reorder_cnxt->priv->adapter->dev,
 213                                 "info: flush data %d\n", start_win);
 214                 mwifiex_11n_dispatch_pkt_until_start_win(reorder_cnxt->priv,
 215                                 reorder_cnxt->ptr,
 216                                 ((reorder_cnxt->ptr->start_win +
 217                                   start_win + 1) & (MAX_TID_VALUE - 1)));
 218         }
 219 }
 220
 221 /*
 222  * This function creates an entry in Rx reordering table for the
 223  * given TA/TID.
 224  *
 225  * The function also initializes the entry with sequence number, window
 226  * size as well as initializes the timer.
 227  *
 228  * If the received TA/TID pair is already present, all the packets are
 229  * dispatched and the window size is moved until the SSN.
 230  */
 231 static void
 232 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 233                                  int tid, int win_size, int seq_num)
 234 {
 235         int i;
 236         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr, *new_node;
 237         u16 last_seq = 0;
 238         unsigned long flags;
 239
 240         /*
 241          * If we get a TID, ta pair which is already present dispatch all the
 242          * the packets and move the window size until the ssn
 243          */
 244         rx_reor_tbl_ptr = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 245         if (rx_reor_tbl_ptr) {
 246                 mwifiex_11n_dispatch_pkt_until_start_win(priv, rx_reor_tbl_ptr,
 247                                                          seq_num);
 248                 return;
 249         }
 250         /* if !rx_reor_tbl_ptr then create one */
 251         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 252         if (!new_node) {
 253                 dev_err(priv->adapter->dev, "%s: failed to alloc new_node\n",
 254                        __func__);
 255                 return;
 256         }
 257
 258         INIT_LIST_HEAD(&new_node->list);
 259         new_node->tid = tid;
 260         memcpy(new_node->ta, ta, ETH_ALEN);
 261         new_node->start_win = seq_num;
 262         if (mwifiex_queuing_ra_based(priv))
 263                 /* TODO for adhoc */
 264                 dev_dbg(priv->adapter->dev,
 265                         "info: ADHOC:last_seq=%d start_win=%d\n",
 266                         last_seq, new_node->start_win);
 267         else
 268                 last_seq = priv->rx_seq[tid];
 269
 270         if (last_seq >= new_node->start_win)
 271                 new_node->start_win = last_seq + 1;
 272
 273         new_node->win_size = win_size;
 274
 275         new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
 276                                         GFP_KERNEL);
 277         if (!new_node->rx_reorder_ptr) {
 278                 kfree((u8 *) new_node);
 279                 dev_err(priv->adapter->dev,
 280                         "%s: failed to alloc reorder_ptr\n", __func__);
 281                 return;
 282         }
 283
 284         new_node->timer_context.ptr = new_node;
 285         new_node->timer_context.priv = priv;
 286
 287         init_timer(&new_node->timer_context.timer);
 288         new_node->timer_context.timer.function = mwifiex_flush_data;
 289         new_node->timer_context.timer.data =
 290                         (unsigned long) &new_node->timer_context;
 291
 292         for (i = 0; i < win_size; ++i)
 293                 new_node->rx_reorder_ptr[i] = NULL;
 294
 295         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 296         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 297         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 298 }
 299
 300 /*
 301  * This function prepares command for adding a BA request.
 302  *
 303  * Preparation includes -
 304  *      - Setting command ID and proper size
 305  *      - Setting add BA request buffer
 306  *      - Ensuring correct endian-ness
 307  */
 308 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 309 {
 310         struct host_cmd_ds_11n_addba_req *add_ba_req =
 311                 (struct host_cmd_ds_11n_addba_req *)
 312                 &cmd->params.add_ba_req;
 313
 314         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 315         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 316         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * This function prepares command for adding a BA response.
 323  *
 324  * Preparation includes -
 325  *      - Setting command ID and proper size
 326  *      - Setting add BA response buffer
 327  *      - Ensuring correct endian-ness
 328  */
 329 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 330                                   struct host_cmd_ds_command *cmd,
 331                                   void *data_buf)
 332 {
 333         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp =
 334                 (struct host_cmd_ds_11n_addba_rsp *)
 335                 &cmd->params.add_ba_rsp;
 336         struct host_cmd_ds_11n_addba_req *cmd_addba_req =
 337                 (struct host_cmd_ds_11n_addba_req *) data_buf;
 338         u8 tid = 0;
 339         int win_size = 0;
 340         uint16_t block_ack_param_set;
 341
 342         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 343         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 344
 345         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 346                ETH_ALEN);
 347         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 348         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 349         add_ba_rsp->ssn = cmd_addba_req->ssn;
 350
 351         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 352         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 353                 >> BLOCKACKPARAM_TID_POS;
 354         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 355         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 356         /* We donot support AMSDU inside AMPDU, hence reset the bit */
 357         block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 358         block_ack_param_set |= (priv->add_ba_param.rx_win_size <<
 359                                              BLOCKACKPARAM_WINSIZE_POS);
 360         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 361         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 362                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 363                                         >> BLOCKACKPARAM_WINSIZE_POS;
 364         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 365
 366         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 367                             tid, win_size, le16_to_cpu(cmd_addba_req->ssn));
 368         return 0;
 369 }
 370
 371 /*
 372  * This function prepares command for deleting a BA request.
 373  *
 374  * Preparation includes -
 375  *      - Setting command ID and proper size
 376  *      - Setting del BA request buffer
 377  *      - Ensuring correct endian-ness
 378  */
 379 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 380 {
 381         struct host_cmd_ds_11n_delba *del_ba = (struct host_cmd_ds_11n_delba *)
 382                 &cmd->params.del_ba;
 383
 384         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 385         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 386         memcpy(del_ba, data_buf, sizeof(*del_ba));
 387
 388         return 0;
 389 }
 390
 391 /*
 392  * This function identifies if Rx reordering is needed for a received packet.
 393  *
 394  * In case reordering is required, the function will do the reordering
 395  * before sending it to kernel.
 396  *
 397  * The Rx reorder table is checked first with the received TID/TA pair. If
 398  * not found, the received packet is dispatched immediately. But if found,
 399  * the packet is reordered and all the packets in the updated Rx reordering
 400  * table is dispatched until a hole is found.
 401  *
 402  * For sequence number less than the starting window, the packet is dropped.
 403  */
 404 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 405                                 u16 seq_num, u16 tid,
 406                                 u8 *ta, u8 pkt_type, void *payload)
 407 {
 408         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
 409         int start_win, end_win, win_size;
 410         int ret = 0;
 411         u16 pkt_index = 0;
 412
 413         rx_reor_tbl_ptr =
 414                 mwifiex_11n_get_rx_reorder_tbl((struct mwifiex_private *) priv,
 415                                                 tid, ta);
 416         if (!rx_reor_tbl_ptr) {
 417                 if (pkt_type != PKT_TYPE_BAR)
 418                         mwifiex_process_rx_packet(priv->adapter, payload);
 419                 return 0;
 420         }
 421         start_win = rx_reor_tbl_ptr->start_win;
 422         win_size = rx_reor_tbl_ptr->win_size;
 423         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 424         del_timer(&rx_reor_tbl_ptr->timer_context.timer);
 425         mod_timer(&rx_reor_tbl_ptr->timer_context.timer, jiffies
 426                         + (MIN_FLUSH_TIMER_MS * win_size * HZ) / 1000);
 427
 428         /*
 429          * If seq_num is less then starting win then ignore and drop the
 430          * packet
 431          */
 432         if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {/* Wrap */
 433                 if (seq_num >= ((start_win + (TWOPOW11)) & (MAX_TID_VALUE - 1))
 434                                 && (seq_num < start_win))
 435                         return -1;
 436         } else if ((seq_num < start_win)
 437                         || (seq_num > (start_win + (TWOPOW11)))) {
 438                 return -1;
 439         }
 440
 441         /*
 442          * If this packet is a BAR we adjust seq_num as
 443          * WinStart = seq_num
 444          */
 445         if (pkt_type == PKT_TYPE_BAR)
 446                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 447
 448         if (((end_win < start_win)
 449              && (seq_num < (TWOPOW11 - (MAX_TID_VALUE - start_win)))
 450              && (seq_num > end_win)) || ((end_win > start_win)
 451              && ((seq_num > end_win) || (seq_num < start_win)))) {
 452                 end_win = seq_num;
 453                 if (((seq_num - win_size) + 1) >= 0)
 454                         start_win = (end_win - win_size) + 1;
 455                 else
 456                         start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
 457                 ret = mwifiex_11n_dispatch_pkt_until_start_win(priv,
 458                                                 rx_reor_tbl_ptr, start_win);
 459
 460                 if (ret)
 461                         return ret;
 462         }
 463
 464         if (pkt_type != PKT_TYPE_BAR) {
 465                 if (seq_num >= start_win)
 466                         pkt_index = seq_num - start_win;
 467                 else
 468                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 469
 470                 if (rx_reor_tbl_ptr->rx_reorder_ptr[pkt_index])
 471                         return -1;
 472
 473                 rx_reor_tbl_ptr->rx_reorder_ptr[pkt_index] = payload;
 474         }
 475
 476         /*
 477          * Dispatch all packets sequentially from start_win until a
 478          * hole is found and adjust the start_win appropriately
 479          */
 480         ret = mwifiex_11n_scan_and_dispatch(priv, rx_reor_tbl_ptr);
 481
 482         return ret;
 483 }
 484
 485 /*
 486  * This function deletes an entry for a given TID/TA pair.
 487  *
 488  * The TID/TA are taken from del BA event body.
 489  */
 490 void
 491 mwifiex_11n_delete_ba_stream_tbl(struct mwifiex_private *priv, int tid,
 492                                 u8 *peer_mac, u8 type, int initiator)
 493 {
 494         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
 495         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 496         u8 cleanup_rx_reorder_tbl;
 497         unsigned long flags;
 498
 499         if (type == TYPE_DELBA_RECEIVE)
 500                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 501         else
 502                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 503
 504         dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d, "
 505                "initiator=%d\n", peer_mac, tid, initiator);
 506
 507         if (cleanup_rx_reorder_tbl) {
 508                 rx_reor_tbl_ptr = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 509                                                                  peer_mac);
 510                 if (!rx_reor_tbl_ptr) {
 511                         dev_dbg(priv->adapter->dev,
 512                                         "event: TID, TA not found in table\n");
 513                         return;
 514                 }
 515                 mwifiex_11n_delete_rx_reorder_tbl_entry(priv, rx_reor_tbl_ptr);
 516         } else {
 517                 ptx_tbl = mwifiex_11n_get_tx_ba_stream_tbl(priv, tid, peer_mac);
 518                 if (!ptx_tbl) {
 519                         dev_dbg(priv->adapter->dev,
 520                                         "event: TID, RA not found in table\n");
 521                         return;
 522                 }
 523
 524                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 525                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 526                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 527         }
 528 }
 529
 530 /*
 531  * This function handles the command response of an add BA response.
 532  *
 533  * Handling includes changing the header fields into CPU format and
 534  * creating the stream, provided the add BA is accepted.
 535  */
 536 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 537                                struct host_cmd_ds_command *resp)
 538 {
 539         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp =
 540                 (struct host_cmd_ds_11n_addba_rsp *)
 541                 &resp->params.add_ba_rsp;
 542         int tid, win_size;
 543         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr = NULL;
 544         uint16_t block_ack_param_set;
 545
 546         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 547
 548         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 549                 >> BLOCKACKPARAM_TID_POS;
 550         /*
 551          * Check if we had rejected the ADDBA, if yes then do not create
 552          * the stream
 553          */
 554         if (le16_to_cpu(add_ba_rsp->status_code) == BA_RESULT_SUCCESS) {
 555                 win_size = (block_ack_param_set &
 556                         IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 557                         >> BLOCKACKPARAM_WINSIZE_POS;
 558
 559                 dev_dbg(priv->adapter->dev, "cmd: ADDBA RSP: %pM"
 560                        " tid=%d ssn=%d win_size=%d\n",
 561                        add_ba_rsp->peer_mac_addr,
 562                        tid, add_ba_rsp->ssn, win_size);
 563         } else {
 564                 dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
 565                                         add_ba_rsp->peer_mac_addr, tid);
 566
 567                 rx_reor_tbl_ptr = mwifiex_11n_get_rx_reorder_tbl(priv,
 568                                         tid, add_ba_rsp->peer_mac_addr);
 569                 if (rx_reor_tbl_ptr)
 570                         mwifiex_11n_delete_rx_reorder_tbl_entry(priv,
 571                                 rx_reor_tbl_ptr);
 572         }
 573
 574         return 0;
 575 }
 576
 577 /*
 578  * This function handles BA stream timeout event by preparing and sending
 579  * a command to the firmware.
 580  */
 581 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 582                                    struct host_cmd_ds_11n_batimeout *event)
 583 {
 584         struct host_cmd_ds_11n_delba delba;
 585
 586         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 587         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 588
 589         delba.del_ba_param_set |=
 590                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 591         delba.del_ba_param_set |= cpu_to_le16(
 592                 (u16) event->origninator << DELBA_INITIATOR_POS);
 593         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 594         mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba);
 595 }
 596
 597 /*
 598  * This function cleans up the Rx reorder table by deleting all the entries
 599  * and re-initializing.
 600  */
 601 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 602 {
 603         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 604         unsigned long flags;
 605
 606         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 607         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 608                                  &priv->rx_reorder_tbl_ptr, list) {
 609                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 610                 mwifiex_11n_delete_rx_reorder_tbl_entry(priv, del_tbl_ptr);
 611                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 612         }
 613         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 614
 615         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 616         memset(priv->rx_seq, 0, sizeof(priv->rx_seq));
 617 }