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, rx_tmp_ptr);
  62                 }
  63         }
  64
  65         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  66         /*
  67          * We don't have a circular buffer, hence use rotation to simulate
  68          * circular buffer
  69          */
  70         for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
  71                 tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
  72                 tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
  73         }
  74
  75         tbl->start_win = start_win;
  76         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  77 }
  78
  79 /*
  80  * This function dispatches all packets in the Rx reorder table until
  81  * a hole is found.
  82  *
  83  * The start window is adjusted automatically when a hole is located.
  84  * Since the buffer is linear, the function uses rotation to simulate
  85  * circular buffer.
  86  */
  87 static void
  88 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
  89                               struct mwifiex_rx_reorder_tbl *tbl)
  90 {
  91         int i, j, xchg;
  92         void *rx_tmp_ptr;
  93         unsigned long flags;
  94
  95         for (i = 0; i < tbl->win_size; ++i) {
  96                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
  97                 if (!tbl->rx_reorder_ptr[i]) {
  98                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
  99                         break;
 100                 }
 101                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 102                 tbl->rx_reorder_ptr[i] = NULL;
 103                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 104
 105                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
 106                         mwifiex_handle_uap_rx_forward(priv, rx_tmp_ptr);
 107                 else
 108                         mwifiex_process_rx_packet(priv, rx_tmp_ptr);
 109         }
 110
 111         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 112         /*
 113          * We don't have a circular buffer, hence use rotation to simulate
 114          * circular buffer
 115          */
 116         if (i > 0) {
 117                 xchg = tbl->win_size - i;
 118                 for (j = 0; j < xchg; ++j) {
 119                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 120                         tbl->rx_reorder_ptr[i + j] = NULL;
 121                 }
 122         }
 123         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 124         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 125 }
 126
 127 /*
 128  * This function deletes the Rx reorder table and frees the memory.
 129  *
 130  * The function stops the associated timer and dispatches all the
 131  * pending packets in the Rx reorder table before deletion.
 132  */
 133 static void
 134 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 135                              struct mwifiex_rx_reorder_tbl *tbl)
 136 {
 137         unsigned long flags;
 138
 139         if (!tbl)
 140                 return;
 141
 142         mwifiex_11n_dispatch_pkt(priv, tbl, (tbl->start_win + tbl->win_size) &
 143                                             (MAX_TID_VALUE - 1));
 144
 145         del_timer(&tbl->timer_context.timer);
 146
 147         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 148         list_del(&tbl->list);
 149         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 150
 151         kfree(tbl->rx_reorder_ptr);
 152         kfree(tbl);
 153 }
 154
 155 /*
 156  * This function returns the pointer to an entry in Rx reordering
 157  * table which matches the given TA/TID pair.
 158  */
 159 struct mwifiex_rx_reorder_tbl *
 160 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 161 {
 162         struct mwifiex_rx_reorder_tbl *tbl;
 163         unsigned long flags;
 164
 165         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 166         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 167                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 168                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 169                                                flags);
 170                         return tbl;
 171                 }
 172         }
 173         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 174
 175         return NULL;
 176 }
 177
 178 /* This function retrieves the pointer to an entry in Rx reordering
 179  * table which matches the given TA and deletes it.
 180  */
 181 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 182 {
 183         struct mwifiex_rx_reorder_tbl *tbl, *tmp;
 184         unsigned long flags;
 185
 186         if (!ta)
 187                 return;
 188
 189         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 190         list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
 191                 if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
 192                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 193                                                flags);
 194                         mwifiex_del_rx_reorder_entry(priv, tbl);
 195                         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 196                 }
 197         }
 198         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 199
 200         return;
 201 }
 202
 203 /*
 204  * This function finds the last sequence number used in the packets
 205  * buffered in Rx reordering table.
 206  */
 207 static int
 208 mwifiex_11n_find_last_seq_num(struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr)
 209 {
 210         int i;
 211
 212         for (i = (rx_reorder_tbl_ptr->win_size - 1); i >= 0; --i)
 213                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 214                         return i;
 215
 216         return -1;
 217 }
 218
 219 /*
 220  * This function flushes all the packets in Rx reordering table.
 221  *
 222  * The function checks if any packets are currently buffered in the
 223  * table or not. In case there are packets available, it dispatches
 224  * them and then dumps the Rx reordering table.
 225  */
 226 static void
 227 mwifiex_flush_data(unsigned long context)
 228 {
 229         struct reorder_tmr_cnxt *ctx =
 230                 (struct reorder_tmr_cnxt *) context;
 231         int start_win;
 232
 233         start_win = mwifiex_11n_find_last_seq_num(ctx->ptr);
 234
 235         if (start_win < 0)
 236                 return;
 237
 238         dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", start_win);
 239         mwifiex_11n_dispatch_pkt(ctx->priv, ctx->ptr,
 240                                  (ctx->ptr->start_win + start_win + 1) &
 241                                  (MAX_TID_VALUE - 1));
 242 }
 243
 244 /*
 245  * This function creates an entry in Rx reordering table for the
 246  * given TA/TID.
 247  *
 248  * The function also initializes the entry with sequence number, window
 249  * size as well as initializes the timer.
 250  *
 251  * If the received TA/TID pair is already present, all the packets are
 252  * dispatched and the window size is moved until the SSN.
 253  */
 254 static void
 255 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 256                                   int tid, int win_size, int seq_num)
 257 {
 258         int i;
 259         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 260         u16 last_seq = 0;
 261         unsigned long flags;
 262         struct mwifiex_sta_node *node;
 263
 264         /*
 265          * If we get a TID, ta pair which is already present dispatch all the
 266          * the packets and move the window size until the ssn
 267          */
 268         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 269         if (tbl) {
 270                 mwifiex_11n_dispatch_pkt(priv, tbl, seq_num);
 271                 return;
 272         }
 273         /* if !tbl then create one */
 274         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 275         if (!new_node) {
 276                 dev_err(priv->adapter->dev, "%s: failed to alloc new_node\n",
 277                         __func__);
 278                 return;
 279         }
 280
 281         INIT_LIST_HEAD(&new_node->list);
 282         new_node->tid = tid;
 283         memcpy(new_node->ta, ta, ETH_ALEN);
 284         new_node->start_win = seq_num;
 285
 286         if (mwifiex_queuing_ra_based(priv)) {
 287                 dev_dbg(priv->adapter->dev,
 288                         "info: AP/ADHOC:last_seq=%d start_win=%d\n",
 289                         last_seq, new_node->start_win);
 290                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
 291                         node = mwifiex_get_sta_entry(priv, ta);
 292                         if (node)
 293                                 last_seq = node->rx_seq[tid];
 294                 }
 295         } else {
 296                 last_seq = priv->rx_seq[tid];
 297         }
 298
 299         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 300             last_seq >= new_node->start_win)
 301                 new_node->start_win = last_seq + 1;
 302
 303         new_node->win_size = win_size;
 304         new_node->flags = 0;
 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, payload);
 445                 }
 446                 return 0;
 447         }
 448         start_win = tbl->start_win;
 449         win_size = tbl->win_size;
 450         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 451         del_timer(&tbl->timer_context.timer);
 452         mod_timer(&tbl->timer_context.timer,
 453                   jiffies + (MIN_FLUSH_TIMER_MS * win_size * HZ) / 1000);
 454
 455         /*
 456          * If seq_num is less then starting win then ignore and drop the
 457          * packet
 458          */
 459         if (tbl->flags & RXREOR_FORCE_NO_DROP) {
 460                 dev_dbg(priv->adapter->dev,
 461                         "RXREOR_FORCE_NO_DROP when HS is activated\n");
 462                 tbl->flags &= ~RXREOR_FORCE_NO_DROP;
 463         } else {
 464                 if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
 465                         if (seq_num >= ((start_win + TWOPOW11) &
 466                                         (MAX_TID_VALUE - 1)) &&
 467                             seq_num < start_win)
 468                                 return -1;
 469                 } else if ((seq_num < start_win) ||
 470                            (seq_num > (start_win + TWOPOW11))) {
 471                         return -1;
 472                 }
 473         }
 474
 475         /*
 476          * If this packet is a BAR we adjust seq_num as
 477          * WinStart = seq_num
 478          */
 479         if (pkt_type == PKT_TYPE_BAR)
 480                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 481
 482         if (((end_win < start_win) &&
 483              (seq_num < start_win) && (seq_num > end_win)) ||
 484             ((end_win > start_win) && ((seq_num > end_win) ||
 485                                        (seq_num < start_win)))) {
 486                 end_win = seq_num;
 487                 if (((seq_num - win_size) + 1) >= 0)
 488                         start_win = (end_win - win_size) + 1;
 489                 else
 490                         start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
 491                 mwifiex_11n_dispatch_pkt(priv, tbl, start_win);
 492         }
 493
 494         if (pkt_type != PKT_TYPE_BAR) {
 495                 if (seq_num >= start_win)
 496                         pkt_index = seq_num - start_win;
 497                 else
 498                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 499
 500                 if (tbl->rx_reorder_ptr[pkt_index])
 501                         return -1;
 502
 503                 tbl->rx_reorder_ptr[pkt_index] = payload;
 504         }
 505
 506         /*
 507          * Dispatch all packets sequentially from start_win until a
 508          * hole is found and adjust the start_win appropriately
 509          */
 510         mwifiex_11n_scan_and_dispatch(priv, tbl);
 511
 512         return 0;
 513 }
 514
 515 /*
 516  * This function deletes an entry for a given TID/TA pair.
 517  *
 518  * The TID/TA are taken from del BA event body.
 519  */
 520 void
 521 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 522                    u8 type, int initiator)
 523 {
 524         struct mwifiex_rx_reorder_tbl *tbl;
 525         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 526         u8 cleanup_rx_reorder_tbl;
 527         unsigned long flags;
 528
 529         if (type == TYPE_DELBA_RECEIVE)
 530                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 531         else
 532                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 533
 534         dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
 535                 peer_mac, tid, initiator);
 536
 537         if (cleanup_rx_reorder_tbl) {
 538                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 539                                                                  peer_mac);
 540                 if (!tbl) {
 541                         dev_dbg(priv->adapter->dev,
 542                                 "event: TID, TA not found in table\n");
 543                         return;
 544                 }
 545                 mwifiex_del_rx_reorder_entry(priv, tbl);
 546         } else {
 547                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 548                 if (!ptx_tbl) {
 549                         dev_dbg(priv->adapter->dev,
 550                                 "event: TID, RA not found in table\n");
 551                         return;
 552                 }
 553
 554                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 555                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 556                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 557         }
 558 }
 559
 560 /*
 561  * This function handles the command response of an add BA response.
 562  *
 563  * Handling includes changing the header fields into CPU format and
 564  * creating the stream, provided the add BA is accepted.
 565  */
 566 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 567                                struct host_cmd_ds_command *resp)
 568 {
 569         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 570         int tid, win_size;
 571         struct mwifiex_rx_reorder_tbl *tbl;
 572         uint16_t block_ack_param_set;
 573
 574         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 575
 576         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 577                 >> BLOCKACKPARAM_TID_POS;
 578         /*
 579          * Check if we had rejected the ADDBA, if yes then do not create
 580          * the stream
 581          */
 582         if (le16_to_cpu(add_ba_rsp->status_code) == BA_RESULT_SUCCESS) {
 583                 win_size = (block_ack_param_set &
 584                         IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 585                         >> BLOCKACKPARAM_WINSIZE_POS;
 586
 587                 dev_dbg(priv->adapter->dev,
 588                         "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 589                         add_ba_rsp->peer_mac_addr, tid,
 590                         add_ba_rsp->ssn, win_size);
 591         } else {
 592                 dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
 593                         add_ba_rsp->peer_mac_addr, tid);
 594
 595                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 596                                                      add_ba_rsp->peer_mac_addr);
 597                 if (tbl)
 598                         mwifiex_del_rx_reorder_entry(priv, tbl);
 599         }
 600
 601         return 0;
 602 }
 603
 604 /*
 605  * This function handles BA stream timeout event by preparing and sending
 606  * a command to the firmware.
 607  */
 608 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 609                                    struct host_cmd_ds_11n_batimeout *event)
 610 {
 611         struct host_cmd_ds_11n_delba delba;
 612
 613         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 614         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 615
 616         delba.del_ba_param_set |=
 617                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 618         delba.del_ba_param_set |= cpu_to_le16(
 619                 (u16) event->origninator << DELBA_INITIATOR_POS);
 620         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 621         mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba);
 622 }
 623
 624 /*
 625  * This function cleans up the Rx reorder table by deleting all the entries
 626  * and re-initializing.
 627  */
 628 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 629 {
 630         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 631         unsigned long flags;
 632
 633         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 634         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 635                                  &priv->rx_reorder_tbl_ptr, list) {
 636                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 637                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 638                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 639         }
 640         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 641
 642         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 643         mwifiex_reset_11n_rx_seq_num(priv);
 644 }
 645
 646 /*
 647  * This function updates all rx_reorder_tbl's flags.
 648  */
 649 void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
 650 {
 651         struct mwifiex_private *priv;
 652         struct mwifiex_rx_reorder_tbl *tbl;
 653         unsigned long lock_flags;
 654         int i;
 655
 656         for (i = 0; i < adapter->priv_num; i++) {
 657                 priv = adapter->priv[i];
 658                 if (!priv)
 659                         continue;
 660                 if (list_empty(&priv->rx_reorder_tbl_ptr))
 661                         continue;
 662
 663                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
 664                 list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
 665                         tbl->flags = flags;
 666                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
 667         }
 668
 669         return;
 670 }