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 /* This function will dispatch amsdu packet and forward it to kernel/upper
  30  * layer.
  31  */
  32 static int mwifiex_11n_dispatch_amsdu_pkt(struct mwifiex_private *priv,
  33                                           struct sk_buff *skb)
  34 {
  35         struct rxpd *local_rx_pd = (struct rxpd *)(skb->data);
  36         int ret;
  37
  38         if (le16_to_cpu(local_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
  39                 struct sk_buff_head list;
  40                 struct sk_buff *rx_skb;
  41
  42                 __skb_queue_head_init(&list);
  43
  44                 skb_pull(skb, le16_to_cpu(local_rx_pd->rx_pkt_offset));
  45                 skb_trim(skb, le16_to_cpu(local_rx_pd->rx_pkt_length));
  46
  47                 ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
  48                                          priv->wdev->iftype, 0, false);
  49
  50                 while (!skb_queue_empty(&list)) {
  51                         rx_skb = __skb_dequeue(&list);
  52                         ret = mwifiex_recv_packet(priv, rx_skb);
  53                         if (ret == -1)
  54                                 dev_err(priv->adapter->dev,
  55                                         "Rx of A-MSDU failed");
  56                 }
  57                 return 0;
  58         }
  59
  60         return -1;
  61 }
  62
  63 /* This function will process the rx packet and forward it to kernel/upper
  64  * layer.
  65  */
  66 static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
  67 {
  68         int ret = mwifiex_11n_dispatch_amsdu_pkt(priv, payload);
  69
  70         if (!ret)
  71                 return 0;
  72
  73         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  74                 return mwifiex_handle_uap_rx_forward(priv, payload);
  75
  76         return mwifiex_process_rx_packet(priv, payload);
  77 }
  78
  79 /*
  80  * This function dispatches all packets in the Rx reorder table until the
  81  * start window.
  82  *
  83  * There could be holes in the buffer, which are skipped by the function.
  84  * Since the buffer is linear, the function uses rotation to simulate
  85  * circular buffer.
  86  */
  87 static void
  88 mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
  89                                          struct mwifiex_rx_reorder_tbl *tbl,
  90                                          int start_win)
  91 {
  92         int pkt_to_send, i;
  93         void *rx_tmp_ptr;
  94         unsigned long flags;
  95
  96         pkt_to_send = (start_win > tbl->start_win) ?
  97                       min((start_win - tbl->start_win), tbl->win_size) :
  98                       tbl->win_size;
  99
 100         for (i = 0; i < pkt_to_send; ++i) {
 101                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 102                 rx_tmp_ptr = NULL;
 103                 if (tbl->rx_reorder_ptr[i]) {
 104                         rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 105                         tbl->rx_reorder_ptr[i] = NULL;
 106                 }
 107                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 108                 if (rx_tmp_ptr)
 109                         mwifiex_11n_dispatch_pkt(priv, 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         for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
 118                 tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
 119                 tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
 120         }
 121
 122         tbl->start_win = start_win;
 123         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 124 }
 125
 126 /*
 127  * This function dispatches all packets in the Rx reorder table until
 128  * a hole is found.
 129  *
 130  * The start window is adjusted automatically when a hole is located.
 131  * Since the buffer is linear, the function uses rotation to simulate
 132  * circular buffer.
 133  */
 134 static void
 135 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
 136                               struct mwifiex_rx_reorder_tbl *tbl)
 137 {
 138         int i, j, xchg;
 139         void *rx_tmp_ptr;
 140         unsigned long flags;
 141
 142         for (i = 0; i < tbl->win_size; ++i) {
 143                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 144                 if (!tbl->rx_reorder_ptr[i]) {
 145                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 146                         break;
 147                 }
 148                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 149                 tbl->rx_reorder_ptr[i] = NULL;
 150                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 151                 mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 152         }
 153
 154         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 155         /*
 156          * We don't have a circular buffer, hence use rotation to simulate
 157          * circular buffer
 158          */
 159         if (i > 0) {
 160                 xchg = tbl->win_size - i;
 161                 for (j = 0; j < xchg; ++j) {
 162                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 163                         tbl->rx_reorder_ptr[i + j] = NULL;
 164                 }
 165         }
 166         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 167         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 168 }
 169
 170 /*
 171  * This function deletes the Rx reorder table and frees the memory.
 172  *
 173  * The function stops the associated timer and dispatches all the
 174  * pending packets in the Rx reorder table before deletion.
 175  */
 176 static void
 177 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 178                              struct mwifiex_rx_reorder_tbl *tbl)
 179 {
 180         unsigned long flags;
 181         int start_win;
 182
 183         if (!tbl)
 184                 return;
 185
 186         start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
 187         mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 188
 189         del_timer_sync(&tbl->timer_context.timer);
 190
 191         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 192         list_del(&tbl->list);
 193         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 194
 195         kfree(tbl->rx_reorder_ptr);
 196         kfree(tbl);
 197 }
 198
 199 /*
 200  * This function returns the pointer to an entry in Rx reordering
 201  * table which matches the given TA/TID pair.
 202  */
 203 struct mwifiex_rx_reorder_tbl *
 204 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 205 {
 206         struct mwifiex_rx_reorder_tbl *tbl;
 207         unsigned long flags;
 208
 209         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 210         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 211                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 212                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 213                                                flags);
 214                         return tbl;
 215                 }
 216         }
 217         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 218
 219         return NULL;
 220 }
 221
 222 /* This function retrieves the pointer to an entry in Rx reordering
 223  * table which matches the given TA and deletes it.
 224  */
 225 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 226 {
 227         struct mwifiex_rx_reorder_tbl *tbl, *tmp;
 228         unsigned long flags;
 229
 230         if (!ta)
 231                 return;
 232
 233         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 234         list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
 235                 if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
 236                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 237                                                flags);
 238                         mwifiex_del_rx_reorder_entry(priv, tbl);
 239                         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 240                 }
 241         }
 242         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 243
 244         return;
 245 }
 246
 247 /*
 248  * This function finds the last sequence number used in the packets
 249  * buffered in Rx reordering table.
 250  */
 251 static int
 252 mwifiex_11n_find_last_seq_num(struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr)
 253 {
 254         int i;
 255
 256         for (i = (rx_reorder_tbl_ptr->win_size - 1); i >= 0; --i)
 257                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i])
 258                         return i;
 259
 260         return -1;
 261 }
 262
 263 /*
 264  * This function flushes all the packets in Rx reordering table.
 265  *
 266  * The function checks if any packets are currently buffered in the
 267  * table or not. In case there are packets available, it dispatches
 268  * them and then dumps the Rx reordering table.
 269  */
 270 static void
 271 mwifiex_flush_data(unsigned long context)
 272 {
 273         struct reorder_tmr_cnxt *ctx =
 274                 (struct reorder_tmr_cnxt *) context;
 275         int start_win, seq_num;
 276
 277         seq_num = mwifiex_11n_find_last_seq_num(ctx->ptr);
 278
 279         if (seq_num < 0)
 280                 return;
 281
 282         dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", seq_num);
 283         start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
 284         mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
 285                                                  start_win);
 286 }
 287
 288 /*
 289  * This function creates an entry in Rx reordering table for the
 290  * given TA/TID.
 291  *
 292  * The function also initializes the entry with sequence number, window
 293  * size as well as initializes the timer.
 294  *
 295  * If the received TA/TID pair is already present, all the packets are
 296  * dispatched and the window size is moved until the SSN.
 297  */
 298 static void
 299 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 300                                   int tid, int win_size, int seq_num)
 301 {
 302         int i;
 303         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 304         u16 last_seq = 0;
 305         unsigned long flags;
 306         struct mwifiex_sta_node *node;
 307
 308         /*
 309          * If we get a TID, ta pair which is already present dispatch all the
 310          * the packets and move the window size until the ssn
 311          */
 312         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 313         if (tbl) {
 314                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
 315                 return;
 316         }
 317         /* if !tbl then create one */
 318         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 319         if (!new_node)
 320                 return;
 321
 322         INIT_LIST_HEAD(&new_node->list);
 323         new_node->tid = tid;
 324         memcpy(new_node->ta, ta, ETH_ALEN);
 325         new_node->start_win = seq_num;
 326         new_node->init_win = seq_num;
 327         new_node->flags = 0;
 328
 329         if (mwifiex_queuing_ra_based(priv)) {
 330                 dev_dbg(priv->adapter->dev,
 331                         "info: AP/ADHOC:last_seq=%d start_win=%d\n",
 332                         last_seq, new_node->start_win);
 333                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
 334                         node = mwifiex_get_sta_entry(priv, ta);
 335                         if (node)
 336                                 last_seq = node->rx_seq[tid];
 337                 }
 338         } else {
 339                 node = mwifiex_get_sta_entry(priv, ta);
 340                 if (node)
 341                         last_seq = node->rx_seq[tid];
 342                 else
 343                         last_seq = priv->rx_seq[tid];
 344         }
 345
 346         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 347             last_seq >= new_node->start_win) {
 348                 new_node->start_win = last_seq + 1;
 349                 new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
 350         }
 351
 352         new_node->win_size = win_size;
 353
 354         new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
 355                                         GFP_KERNEL);
 356         if (!new_node->rx_reorder_ptr) {
 357                 kfree((u8 *) new_node);
 358                 dev_err(priv->adapter->dev,
 359                         "%s: failed to alloc reorder_ptr\n", __func__);
 360                 return;
 361         }
 362
 363         new_node->timer_context.ptr = new_node;
 364         new_node->timer_context.priv = priv;
 365
 366         init_timer(&new_node->timer_context.timer);
 367         new_node->timer_context.timer.function = mwifiex_flush_data;
 368         new_node->timer_context.timer.data =
 369                         (unsigned long) &new_node->timer_context;
 370
 371         for (i = 0; i < win_size; ++i)
 372                 new_node->rx_reorder_ptr[i] = NULL;
 373
 374         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 375         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 376         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 377 }
 378
 379 /*
 380  * This function prepares command for adding a BA request.
 381  *
 382  * Preparation includes -
 383  *      - Setting command ID and proper size
 384  *      - Setting add BA request buffer
 385  *      - Ensuring correct endian-ness
 386  */
 387 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 388 {
 389         struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
 390
 391         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 392         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 393         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 394
 395         return 0;
 396 }
 397
 398 /*
 399  * This function prepares command for adding a BA response.
 400  *
 401  * Preparation includes -
 402  *      - Setting command ID and proper size
 403  *      - Setting add BA response buffer
 404  *      - Ensuring correct endian-ness
 405  */
 406 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 407                                   struct host_cmd_ds_command *cmd,
 408                                   struct host_cmd_ds_11n_addba_req
 409                                   *cmd_addba_req)
 410 {
 411         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
 412         struct mwifiex_sta_node *sta_ptr;
 413         u32 rx_win_size = priv->add_ba_param.rx_win_size;
 414         u8 tid;
 415         int win_size;
 416         uint16_t block_ack_param_set;
 417
 418         if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 419             ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 420             priv->adapter->is_hw_11ac_capable &&
 421             memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
 422                 sta_ptr = mwifiex_get_sta_entry(priv,
 423                                                 cmd_addba_req->peer_mac_addr);
 424                 if (!sta_ptr) {
 425                         dev_warn(priv->adapter->dev,
 426                                  "BA setup with unknown TDLS peer %pM!\n",
 427                                  cmd_addba_req->peer_mac_addr);
 428                         return -1;
 429                 }
 430                 if (sta_ptr->is_11ac_enabled)
 431                         rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
 432         }
 433
 434         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 435         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 436
 437         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 438                ETH_ALEN);
 439         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 440         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 441         add_ba_rsp->ssn = cmd_addba_req->ssn;
 442
 443         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 444         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 445                 >> BLOCKACKPARAM_TID_POS;
 446         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 447         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 448
 449         /* If we don't support AMSDU inside AMPDU, reset the bit */
 450         if (!priv->add_ba_param.rx_amsdu ||
 451             (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
 452                 block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 453         block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
 454         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 455         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 456                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 457                                         >> BLOCKACKPARAM_WINSIZE_POS;
 458         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 459
 460         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 461                                           tid, win_size,
 462                                           le16_to_cpu(cmd_addba_req->ssn));
 463         return 0;
 464 }
 465
 466 /*
 467  * This function prepares command for deleting a BA request.
 468  *
 469  * Preparation includes -
 470  *      - Setting command ID and proper size
 471  *      - Setting del BA request buffer
 472  *      - Ensuring correct endian-ness
 473  */
 474 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 475 {
 476         struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
 477
 478         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 479         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 480         memcpy(del_ba, data_buf, sizeof(*del_ba));
 481
 482         return 0;
 483 }
 484
 485 /*
 486  * This function identifies if Rx reordering is needed for a received packet.
 487  *
 488  * In case reordering is required, the function will do the reordering
 489  * before sending it to kernel.
 490  *
 491  * The Rx reorder table is checked first with the received TID/TA pair. If
 492  * not found, the received packet is dispatched immediately. But if found,
 493  * the packet is reordered and all the packets in the updated Rx reordering
 494  * table is dispatched until a hole is found.
 495  *
 496  * For sequence number less than the starting window, the packet is dropped.
 497  */
 498 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 499                                 u16 seq_num, u16 tid,
 500                                 u8 *ta, u8 pkt_type, void *payload)
 501 {
 502         struct mwifiex_rx_reorder_tbl *tbl;
 503         int start_win, end_win, win_size;
 504         u16 pkt_index;
 505         bool init_window_shift = false;
 506
 507         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 508         if (!tbl) {
 509                 if (pkt_type != PKT_TYPE_BAR)
 510                         mwifiex_11n_dispatch_pkt(priv, payload);
 511                 return 0;
 512         }
 513
 514         if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
 515                 mwifiex_11n_dispatch_pkt(priv, payload);
 516                 return 0;
 517         }
 518
 519         start_win = tbl->start_win;
 520         win_size = tbl->win_size;
 521         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 522         if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
 523                 init_window_shift = true;
 524                 tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
 525         }
 526         mod_timer(&tbl->timer_context.timer,
 527                   jiffies + msecs_to_jiffies(MIN_FLUSH_TIMER_MS * win_size));
 528
 529         if (tbl->flags & RXREOR_FORCE_NO_DROP) {
 530                 dev_dbg(priv->adapter->dev,
 531                         "RXREOR_FORCE_NO_DROP when HS is activated\n");
 532                 tbl->flags &= ~RXREOR_FORCE_NO_DROP;
 533         } else if (init_window_shift && seq_num < start_win &&
 534                    seq_num >= tbl->init_win) {
 535                 dev_dbg(priv->adapter->dev,
 536                         "Sender TID sequence number reset %d->%d for SSN %d\n",
 537                         start_win, seq_num, tbl->init_win);
 538                 tbl->start_win = start_win = seq_num;
 539                 end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 540         } else {
 541                 /*
 542                  * If seq_num is less then starting win then ignore and drop
 543                  * the packet
 544                  */
 545                 if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
 546                         if (seq_num >= ((start_win + TWOPOW11) &
 547                                         (MAX_TID_VALUE - 1)) &&
 548                             seq_num < start_win)
 549                                 return -1;
 550                 } else if ((seq_num < start_win) ||
 551                            (seq_num > (start_win + TWOPOW11))) {
 552                         return -1;
 553                 }
 554         }
 555
 556         /*
 557          * If this packet is a BAR we adjust seq_num as
 558          * WinStart = seq_num
 559          */
 560         if (pkt_type == PKT_TYPE_BAR)
 561                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 562
 563         if (((end_win < start_win) &&
 564              (seq_num < start_win) && (seq_num > end_win)) ||
 565             ((end_win > start_win) && ((seq_num > end_win) ||
 566                                        (seq_num < start_win)))) {
 567                 end_win = seq_num;
 568                 if (((seq_num - win_size) + 1) >= 0)
 569                         start_win = (end_win - win_size) + 1;
 570                 else
 571                         start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
 572                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 573         }
 574
 575         if (pkt_type != PKT_TYPE_BAR) {
 576                 if (seq_num >= start_win)
 577                         pkt_index = seq_num - start_win;
 578                 else
 579                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 580
 581                 if (tbl->rx_reorder_ptr[pkt_index])
 582                         return -1;
 583
 584                 tbl->rx_reorder_ptr[pkt_index] = payload;
 585         }
 586
 587         /*
 588          * Dispatch all packets sequentially from start_win until a
 589          * hole is found and adjust the start_win appropriately
 590          */
 591         mwifiex_11n_scan_and_dispatch(priv, tbl);
 592
 593         return 0;
 594 }
 595
 596 /*
 597  * This function deletes an entry for a given TID/TA pair.
 598  *
 599  * The TID/TA are taken from del BA event body.
 600  */
 601 void
 602 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 603                    u8 type, int initiator)
 604 {
 605         struct mwifiex_rx_reorder_tbl *tbl;
 606         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 607         u8 cleanup_rx_reorder_tbl;
 608         unsigned long flags;
 609
 610         if (type == TYPE_DELBA_RECEIVE)
 611                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 612         else
 613                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 614
 615         dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
 616                 peer_mac, tid, initiator);
 617
 618         if (cleanup_rx_reorder_tbl) {
 619                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 620                                                                  peer_mac);
 621                 if (!tbl) {
 622                         dev_dbg(priv->adapter->dev,
 623                                 "event: TID, TA not found in table\n");
 624                         return;
 625                 }
 626                 mwifiex_del_rx_reorder_entry(priv, tbl);
 627         } else {
 628                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 629                 if (!ptx_tbl) {
 630                         dev_dbg(priv->adapter->dev,
 631                                 "event: TID, RA not found in table\n");
 632                         return;
 633                 }
 634
 635                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 636                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 637                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 638         }
 639 }
 640
 641 /*
 642  * This function handles the command response of an add BA response.
 643  *
 644  * Handling includes changing the header fields into CPU format and
 645  * creating the stream, provided the add BA is accepted.
 646  */
 647 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 648                                struct host_cmd_ds_command *resp)
 649 {
 650         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 651         int tid, win_size;
 652         struct mwifiex_rx_reorder_tbl *tbl;
 653         uint16_t block_ack_param_set;
 654
 655         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 656
 657         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 658                 >> BLOCKACKPARAM_TID_POS;
 659         /*
 660          * Check if we had rejected the ADDBA, if yes then do not create
 661          * the stream
 662          */
 663         if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
 664                 dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
 665                         add_ba_rsp->peer_mac_addr, tid);
 666
 667                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 668                                                      add_ba_rsp->peer_mac_addr);
 669                 if (tbl)
 670                         mwifiex_del_rx_reorder_entry(priv, tbl);
 671
 672                 return 0;
 673         }
 674
 675         win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 676                     >> BLOCKACKPARAM_WINSIZE_POS;
 677
 678         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 679                                              add_ba_rsp->peer_mac_addr);
 680         if (tbl) {
 681                 if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
 682                     priv->add_ba_param.rx_amsdu &&
 683                     (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
 684                         tbl->amsdu = true;
 685                 else
 686                         tbl->amsdu = false;
 687         }
 688
 689         dev_dbg(priv->adapter->dev,
 690                 "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 691                 add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);
 692
 693         return 0;
 694 }
 695
 696 /*
 697  * This function handles BA stream timeout event by preparing and sending
 698  * a command to the firmware.
 699  */
 700 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 701                                    struct host_cmd_ds_11n_batimeout *event)
 702 {
 703         struct host_cmd_ds_11n_delba delba;
 704
 705         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 706         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 707
 708         delba.del_ba_param_set |=
 709                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 710         delba.del_ba_param_set |= cpu_to_le16(
 711                 (u16) event->origninator << DELBA_INITIATOR_POS);
 712         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 713         mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
 714 }
 715
 716 /*
 717  * This function cleans up the Rx reorder table by deleting all the entries
 718  * and re-initializing.
 719  */
 720 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 721 {
 722         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 723         unsigned long flags;
 724
 725         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 726         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 727                                  &priv->rx_reorder_tbl_ptr, list) {
 728                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 729                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 730                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 731         }
 732         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 733
 734         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 735         mwifiex_reset_11n_rx_seq_num(priv);
 736 }
 737
 738 /*
 739  * This function updates all rx_reorder_tbl's flags.
 740  */
 741 void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
 742 {
 743         struct mwifiex_private *priv;
 744         struct mwifiex_rx_reorder_tbl *tbl;
 745         unsigned long lock_flags;
 746         int i;
 747
 748         for (i = 0; i < adapter->priv_num; i++) {
 749                 priv = adapter->priv[i];
 750                 if (!priv)
 751                         continue;
 752                 if (list_empty(&priv->rx_reorder_tbl_ptr))
 753                         continue;
 754
 755                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
 756                 list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
 757                         tbl->flags = flags;
 758                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
 759         }
 760
 761         return;
 762 }