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                         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  59                                 mwifiex_handle_uap_rx_forward(priv, rx_tmp_ptr);
  60                         else
  61                                 mwifiex_process_rx_packet(priv->adapter,
  62                                                           rx_tmp_ptr);
  63                 }
  64         }
  65
  66         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  67         /*
  68          * We don't have a circular buffer, hence use rotation to simulate
  69          * circular buffer
  70          */
  71         for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
  72                 tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
  73                 tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
  74         }
  75
  76         tbl->start_win = start_win;
  77         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  78 }
  79
  80 /*
  81  * This function dispatches all packets in the Rx reorder table until
  82  * a hole is found.
  83  *
  84  * The start window is adjusted automatically when a hole is located.
  85  * Since the buffer is linear, the function uses rotation to simulate
  86  * circular buffer.
  87  */
  88 static void
  89 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
  90                               struct mwifiex_rx_reorder_tbl *tbl)
  91 {
  92         int i, j, xchg;
  93         void *rx_tmp_ptr;
  94         unsigned long flags;
  95
  96         for (i = 0; i < tbl->win_size; ++i) {
  97                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  98                 if (!tbl->rx_reorder_ptr[i]) {
  99                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 100                         break;
 101                 }
 102                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 103                 tbl->rx_reorder_ptr[i] = NULL;
 104                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 105
 106                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
 107                         mwifiex_handle_uap_rx_forward(priv, rx_tmp_ptr);
 108                 else
 109                         mwifiex_process_rx_packet(priv->adapter, rx_tmp_ptr);
 110         }
 111
 112         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 113         /*
 114          * We don't have a circular buffer, hence use rotation to simulate
 115          * circular buffer
 116          */
 117         if (i > 0) {
 118                 xchg = tbl->win_size - i;
 119                 for (j = 0; j < xchg; ++j) {
 120                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 121                         tbl->rx_reorder_ptr[i + j] = NULL;
 122                 }
 123         }
 124         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 125         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 126 }
 127
 128 /*
 129  * This function deletes the Rx reorder table and frees the memory.
 130  *
 131  * The function stops the associated timer and dispatches all the
 132  * pending packets in the Rx reorder table before deletion.
 133  */
 134 static void
 135 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 136                              struct mwifiex_rx_reorder_tbl *tbl)
 137 {
 138         unsigned long flags;
 139
 140         if (!tbl)
 141                 return;
 142
 143         mwifiex_11n_dispatch_pkt(priv, tbl, (tbl->start_win + tbl->win_size) &
 144                                             (MAX_TID_VALUE - 1));
 145
 146         del_timer(&tbl->timer_context.timer);
 147
 148         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 149         list_del(&tbl->list);
 150         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 151
 152         kfree(tbl->rx_reorder_ptr);
 153         kfree(tbl);
 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 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 *tbl;
 164         unsigned long flags;
 165
 166         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 167         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 168                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 169                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 170                                                flags);
 171                         return tbl;
 172                 }
 173         }
 174         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 175
 176         return NULL;
 177 }
 178
 179 /* This function retrieves the pointer to an entry in Rx reordering
 180  * table which matches the given TA and deletes it.
 181  */
 182 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 183 {
 184         struct mwifiex_rx_reorder_tbl *tbl, *tmp;
 185         unsigned long flags;
 186
 187         if (!ta)
 188                 return;
 189
 190         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 191         list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
 192                 if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
 193                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 194                                                flags);
 195                         mwifiex_del_rx_reorder_entry(priv, tbl);
 196                         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 197                 }
 198         }
 199         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 200
 201         return;
 202 }
 203
 204 /*
 205  * This function finds the last sequence number used in the packets
 206  * buffered in Rx reordering table.
 207  */
 208 static int
 209 mwifiex_11n_find_last_seq_num(struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr)
 210 {
 211         int i;
 212
 213         for (i = (rx_reorder_tbl_ptr->win_size - 1); i >= 0; --i)
 214                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 215                         return i;
 216
 217         return -1;
 218 }
 219
 220 /*
 221  * This function flushes all the packets in Rx reordering table.
 222  *
 223  * The function checks if any packets are currently buffered in the
 224  * table or not. In case there are packets available, it dispatches
 225  * them and then dumps the Rx reordering table.
 226  */
 227 static void
 228 mwifiex_flush_data(unsigned long context)
 229 {
 230         struct reorder_tmr_cnxt *ctx =
 231                 (struct reorder_tmr_cnxt *) context;
 232         int start_win;
 233
 234         start_win = mwifiex_11n_find_last_seq_num(ctx->ptr);
 235
 236         if (start_win < 0)
 237                 return;
 238
 239         dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", start_win);
 240         mwifiex_11n_dispatch_pkt(ctx->priv, ctx->ptr,
 241                                  (ctx->ptr->start_win + start_win + 1) &
 242                                  (MAX_TID_VALUE - 1));
 243 }
 244
 245 /*
 246  * This function creates an entry in Rx reordering table for the
 247  * given TA/TID.
 248  *
 249  * The function also initializes the entry with sequence number, window
 250  * size as well as initializes the timer.
 251  *
 252  * If the received TA/TID pair is already present, all the packets are
 253  * dispatched and the window size is moved until the SSN.
 254  */
 255 static void
 256 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 257                                   int tid, int win_size, int seq_num)
 258 {
 259         int i;
 260         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 261         u16 last_seq = 0;
 262         unsigned long flags;
 263         struct mwifiex_sta_node *node;
 264
 265         /*
 266          * If we get a TID, ta pair which is already present dispatch all the
 267          * the packets and move the window size until the ssn
 268          */
 269         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 270         if (tbl) {
 271                 mwifiex_11n_dispatch_pkt(priv, tbl, seq_num);
 272                 return;
 273         }
 274         /* if !tbl then create one */
 275         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 276         if (!new_node) {
 277                 dev_err(priv->adapter->dev, "%s: failed to alloc new_node\n",
 278                         __func__);
 279                 return;
 280         }
 281
 282         INIT_LIST_HEAD(&new_node->list);
 283         new_node->tid = tid;
 284         memcpy(new_node->ta, ta, ETH_ALEN);
 285         new_node->start_win = seq_num;
 286
 287         if (mwifiex_queuing_ra_based(priv)) {
 288                 dev_dbg(priv->adapter->dev,
 289                         "info: AP/ADHOC:last_seq=%d start_win=%d\n",
 290                         last_seq, new_node->start_win);
 291                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
 292                         node = mwifiex_get_sta_entry(priv, ta);
 293                         if (node)
 294                                 last_seq = node->rx_seq[tid];
 295                 }
 296         } else {
 297                 last_seq = priv->rx_seq[tid];
 298         }
 299
 300         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 301             last_seq >= new_node->start_win)
 302                 new_node->start_win = last_seq + 1;
 303
 304         new_node->win_size = win_size;
 305
 306         new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
 307                                         GFP_KERNEL);
 308         if (!new_node->rx_reorder_ptr) {
 309                 kfree((u8 *) new_node);
 310                 dev_err(priv->adapter->dev,
 311                         "%s: failed to alloc reorder_ptr\n", __func__);
 312                 return;
 313         }
 314
 315         new_node->timer_context.ptr = new_node;
 316         new_node->timer_context.priv = priv;
 317
 318         init_timer(&new_node->timer_context.timer);
 319         new_node->timer_context.timer.function = mwifiex_flush_data;
 320         new_node->timer_context.timer.data =
 321                         (unsigned long) &new_node->timer_context;
 322
 323         for (i = 0; i < win_size; ++i)
 324                 new_node->rx_reorder_ptr[i] = NULL;
 325
 326         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 327         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 328         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 329 }
 330
 331 /*
 332  * This function prepares command for adding a BA request.
 333  *
 334  * Preparation includes -
 335  *      - Setting command ID and proper size
 336  *      - Setting add BA request buffer
 337  *      - Ensuring correct endian-ness
 338  */
 339 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 340 {
 341         struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
 342
 343         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 344         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 345         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 346
 347         return 0;
 348 }
 349
 350 /*
 351  * This function prepares command for adding a BA response.
 352  *
 353  * Preparation includes -
 354  *      - Setting command ID and proper size
 355  *      - Setting add BA response buffer
 356  *      - Ensuring correct endian-ness
 357  */
 358 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 359                                   struct host_cmd_ds_command *cmd,
 360                                   struct host_cmd_ds_11n_addba_req
 361                                   *cmd_addba_req)
 362 {
 363         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
 364         u8 tid;
 365         int win_size;
 366         uint16_t block_ack_param_set;
 367
 368         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 369         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 370
 371         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 372                ETH_ALEN);
 373         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 374         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 375         add_ba_rsp->ssn = cmd_addba_req->ssn;
 376
 377         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 378         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 379                 >> BLOCKACKPARAM_TID_POS;
 380         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 381         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 382         /* We donot support AMSDU inside AMPDU, hence reset the bit */
 383         block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 384         block_ack_param_set |= (priv->add_ba_param.rx_win_size <<
 385                                              BLOCKACKPARAM_WINSIZE_POS);
 386         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 387         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 388                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 389                                         >> BLOCKACKPARAM_WINSIZE_POS;
 390         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 391
 392         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 393                                           tid, win_size,
 394                                           le16_to_cpu(cmd_addba_req->ssn));
 395         return 0;
 396 }
 397
 398 /*
 399  * This function prepares command for deleting a BA request.
 400  *
 401  * Preparation includes -
 402  *      - Setting command ID and proper size
 403  *      - Setting del BA request buffer
 404  *      - Ensuring correct endian-ness
 405  */
 406 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 407 {
 408         struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
 409
 410         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 411         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 412         memcpy(del_ba, data_buf, sizeof(*del_ba));
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * This function identifies if Rx reordering is needed for a received packet.
 419  *
 420  * In case reordering is required, the function will do the reordering
 421  * before sending it to kernel.
 422  *
 423  * The Rx reorder table is checked first with the received TID/TA pair. If
 424  * not found, the received packet is dispatched immediately. But if found,
 425  * the packet is reordered and all the packets in the updated Rx reordering
 426  * table is dispatched until a hole is found.
 427  *
 428  * For sequence number less than the starting window, the packet is dropped.
 429  */
 430 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 431                                 u16 seq_num, u16 tid,
 432                                 u8 *ta, u8 pkt_type, void *payload)
 433 {
 434         struct mwifiex_rx_reorder_tbl *tbl;
 435         int start_win, end_win, win_size;
 436         u16 pkt_index;
 437
 438         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 439         if (!tbl) {
 440                 if (pkt_type != PKT_TYPE_BAR) {
 441                         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
 442                                 mwifiex_handle_uap_rx_forward(priv, payload);
 443                         else
 444                                 mwifiex_process_rx_packet(priv->adapter,
 445                                                           payload);
 446                 }
 447                 return 0;
 448         }
 449         start_win = tbl->start_win;
 450         win_size = tbl->win_size;
 451         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 452         del_timer(&tbl->timer_context.timer);
 453         mod_timer(&tbl->timer_context.timer,
 454                   jiffies + (MIN_FLUSH_TIMER_MS * win_size * HZ) / 1000);
 455
 456         /*
 457          * If seq_num is less then starting win then ignore and drop the
 458          * packet
 459          */
 460         if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {/* Wrap */
 461                 if (seq_num >= ((start_win + TWOPOW11) &
 462                                 (MAX_TID_VALUE - 1)) && (seq_num < start_win))
 463                         return -1;
 464         } else if ((seq_num < start_win) ||
 465                    (seq_num > (start_win + TWOPOW11))) {
 466                 return -1;
 467         }
 468
 469         /*
 470          * If this packet is a BAR we adjust seq_num as
 471          * WinStart = seq_num
 472          */
 473         if (pkt_type == PKT_TYPE_BAR)
 474                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 475
 476         if (((end_win < start_win) &&
 477              (seq_num < (TWOPOW11 - (MAX_TID_VALUE - start_win))) &&
 478              (seq_num > end_win)) ||
 479             ((end_win > start_win) && ((seq_num > end_win) ||
 480                                        (seq_num < start_win)))) {
 481                 end_win = seq_num;
 482                 if (((seq_num - win_size) + 1) >= 0)
 483                         start_win = (end_win - win_size) + 1;
 484                 else
 485                         start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
 486                 mwifiex_11n_dispatch_pkt(priv, tbl, start_win);
 487         }
 488
 489         if (pkt_type != PKT_TYPE_BAR) {
 490                 if (seq_num >= start_win)
 491                         pkt_index = seq_num - start_win;
 492                 else
 493                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 494
 495                 if (tbl->rx_reorder_ptr[pkt_index])
 496                         return -1;
 497
 498                 tbl->rx_reorder_ptr[pkt_index] = payload;
 499         }
 500
 501         /*
 502          * Dispatch all packets sequentially from start_win until a
 503          * hole is found and adjust the start_win appropriately
 504          */
 505         mwifiex_11n_scan_and_dispatch(priv, tbl);
 506
 507         return 0;
 508 }
 509
 510 /*
 511  * This function deletes an entry for a given TID/TA pair.
 512  *
 513  * The TID/TA are taken from del BA event body.
 514  */
 515 void
 516 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 517                    u8 type, int initiator)
 518 {
 519         struct mwifiex_rx_reorder_tbl *tbl;
 520         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 521         u8 cleanup_rx_reorder_tbl;
 522         unsigned long flags;
 523
 524         if (type == TYPE_DELBA_RECEIVE)
 525                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 526         else
 527                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 528
 529         dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
 530                 peer_mac, tid, initiator);
 531
 532         if (cleanup_rx_reorder_tbl) {
 533                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 534                                                                  peer_mac);
 535                 if (!tbl) {
 536                         dev_dbg(priv->adapter->dev,
 537                                 "event: TID, TA not found in table\n");
 538                         return;
 539                 }
 540                 mwifiex_del_rx_reorder_entry(priv, tbl);
 541         } else {
 542                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 543                 if (!ptx_tbl) {
 544                         dev_dbg(priv->adapter->dev,
 545                                 "event: TID, RA not found in table\n");
 546                         return;
 547                 }
 548
 549                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 550                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 551                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 552         }
 553 }
 554
 555 /*
 556  * This function handles the command response of an add BA response.
 557  *
 558  * Handling includes changing the header fields into CPU format and
 559  * creating the stream, provided the add BA is accepted.
 560  */
 561 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 562                                struct host_cmd_ds_command *resp)
 563 {
 564         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 565         int tid, win_size;
 566         struct mwifiex_rx_reorder_tbl *tbl;
 567         uint16_t block_ack_param_set;
 568
 569         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 570
 571         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 572                 >> BLOCKACKPARAM_TID_POS;
 573         /*
 574          * Check if we had rejected the ADDBA, if yes then do not create
 575          * the stream
 576          */
 577         if (le16_to_cpu(add_ba_rsp->status_code) == BA_RESULT_SUCCESS) {
 578                 win_size = (block_ack_param_set &
 579                         IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 580                         >> BLOCKACKPARAM_WINSIZE_POS;
 581
 582                 dev_dbg(priv->adapter->dev,
 583                         "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 584                         add_ba_rsp->peer_mac_addr, tid,
 585                         add_ba_rsp->ssn, win_size);
 586         } else {
 587                 dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
 588                         add_ba_rsp->peer_mac_addr, tid);
 589
 590                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 591                                                      add_ba_rsp->peer_mac_addr);
 592                 if (tbl)
 593                         mwifiex_del_rx_reorder_entry(priv, tbl);
 594         }
 595
 596         return 0;
 597 }
 598
 599 /*
 600  * This function handles BA stream timeout event by preparing and sending
 601  * a command to the firmware.
 602  */
 603 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 604                                    struct host_cmd_ds_11n_batimeout *event)
 605 {
 606         struct host_cmd_ds_11n_delba delba;
 607
 608         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 609         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 610
 611         delba.del_ba_param_set |=
 612                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 613         delba.del_ba_param_set |= cpu_to_le16(
 614                 (u16) event->origninator << DELBA_INITIATOR_POS);
 615         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 616         mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba);
 617 }
 618
 619 /*
 620  * This function cleans up the Rx reorder table by deleting all the entries
 621  * and re-initializing.
 622  */
 623 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 624 {
 625         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 626         unsigned long flags;
 627
 628         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 629         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 630                                  &priv->rx_reorder_tbl_ptr, list) {
 631                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 632                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 633                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 634         }
 635         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 636
 637         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 638         mwifiex_reset_11n_rx_seq_num(priv);
 639 }