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

   1 /*
   2  * Marvell Wireless LAN device driver: 802.11n RX Re-ordering
   3  *
   4  * Copyright (C) 2011-2014, 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, NULL, NULL);
  49
  50                 while (!skb_queue_empty(&list)) {
  51                         struct rx_packet_hdr *rx_hdr;
  52
  53                         rx_skb = __skb_dequeue(&list);
  54                         rx_hdr = (struct rx_packet_hdr *)rx_skb->data;
  55                         if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
  56                             ntohs(rx_hdr->eth803_hdr.h_proto) == ETH_P_TDLS) {
  57                                 mwifiex_process_tdls_action_frame(priv,
  58                                                                   (u8 *)rx_hdr,
  59                                                                   skb->len);
  60                         }
  61
  62                         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  63                                 ret = mwifiex_uap_recv_packet(priv, rx_skb);
  64                         else
  65                                 ret = mwifiex_recv_packet(priv, rx_skb);
  66                         if (ret == -1)
  67                                 mwifiex_dbg(priv->adapter, ERROR,
  68                                             "Rx of A-MSDU failed");
  69                 }
  70                 return 0;
  71         }
  72
  73         return -1;
  74 }
  75
  76 /* This function will process the rx packet and forward it to kernel/upper
  77  * layer.
  78  */
  79 static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
  80 {
  81
  82         int ret;
  83
  84         if (!payload) {
  85                 mwifiex_dbg(priv->adapter, INFO, "info: fw drop data\n");
  86                 return 0;
  87         }
  88
  89         ret = mwifiex_11n_dispatch_amsdu_pkt(priv, payload);
  90         if (!ret)
  91                 return 0;
  92
  93         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
  94                 return mwifiex_handle_uap_rx_forward(priv, payload);
  95
  96         return mwifiex_process_rx_packet(priv, payload);
  97 }
  98
  99 /*
 100  * This function dispatches all packets in the Rx reorder table until the
 101  * start window.
 102  *
 103  * There could be holes in the buffer, which are skipped by the function.
 104  * Since the buffer is linear, the function uses rotation to simulate
 105  * circular buffer.
 106  */
 107 static void
 108 mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
 109                                          struct mwifiex_rx_reorder_tbl *tbl,
 110                                          int start_win)
 111 {
 112         int pkt_to_send, i;
 113         void *rx_tmp_ptr;
 114         unsigned long flags;
 115
 116         pkt_to_send = (start_win > tbl->start_win) ?
 117                       min((start_win - tbl->start_win), tbl->win_size) :
 118                       tbl->win_size;
 119
 120         for (i = 0; i < pkt_to_send; ++i) {
 121                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 122                 rx_tmp_ptr = NULL;
 123                 if (tbl->rx_reorder_ptr[i]) {
 124                         rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 125                         tbl->rx_reorder_ptr[i] = NULL;
 126                 }
 127                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 128                 if (rx_tmp_ptr)
 129                         mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 130         }
 131
 132         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 133         /*
 134          * We don't have a circular buffer, hence use rotation to simulate
 135          * circular buffer
 136          */
 137         for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
 138                 tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
 139                 tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
 140         }
 141
 142         tbl->start_win = start_win;
 143         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 144 }
 145
 146 /*
 147  * This function dispatches all packets in the Rx reorder table until
 148  * a hole is found.
 149  *
 150  * The start window is adjusted automatically when a hole is located.
 151  * Since the buffer is linear, the function uses rotation to simulate
 152  * circular buffer.
 153  */
 154 static void
 155 mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
 156                               struct mwifiex_rx_reorder_tbl *tbl)
 157 {
 158         int i, j, xchg;
 159         void *rx_tmp_ptr;
 160         unsigned long flags;
 161
 162         for (i = 0; i < tbl->win_size; ++i) {
 163                 spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 164                 if (!tbl->rx_reorder_ptr[i]) {
 165                         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 166                         break;
 167                 }
 168                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 169                 tbl->rx_reorder_ptr[i] = NULL;
 170                 spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 171                 mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 172         }
 173
 174         spin_lock_irqsave(&priv->rx_pkt_lock, flags);
 175         /*
 176          * We don't have a circular buffer, hence use rotation to simulate
 177          * circular buffer
 178          */
 179         if (i > 0) {
 180                 xchg = tbl->win_size - i;
 181                 for (j = 0; j < xchg; ++j) {
 182                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 183                         tbl->rx_reorder_ptr[i + j] = NULL;
 184                 }
 185         }
 186         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 187         spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
 188 }
 189
 190 /*
 191  * This function deletes the Rx reorder table and frees the memory.
 192  *
 193  * The function stops the associated timer and dispatches all the
 194  * pending packets in the Rx reorder table before deletion.
 195  */
 196 static void
 197 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 198                              struct mwifiex_rx_reorder_tbl *tbl)
 199 {
 200         unsigned long flags;
 201         int start_win;
 202
 203         if (!tbl)
 204                 return;
 205
 206         spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
 207         priv->adapter->rx_locked = true;
 208         if (priv->adapter->rx_processing) {
 209                 spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 210                 flush_workqueue(priv->adapter->rx_workqueue);
 211         } else {
 212                 spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 213         }
 214
 215         start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
 216         mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 217
 218         del_timer_sync(&tbl->timer_context.timer);
 219         tbl->timer_context.timer_is_set = false;
 220
 221         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 222         list_del(&tbl->list);
 223         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 224
 225         kfree(tbl->rx_reorder_ptr);
 226         kfree(tbl);
 227
 228         spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
 229         priv->adapter->rx_locked = false;
 230         spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 231
 232 }
 233
 234 /*
 235  * This function returns the pointer to an entry in Rx reordering
 236  * table which matches the given TA/TID pair.
 237  */
 238 struct mwifiex_rx_reorder_tbl *
 239 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 240 {
 241         struct mwifiex_rx_reorder_tbl *tbl;
 242         unsigned long flags;
 243
 244         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 245         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 246                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 247                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 248                                                flags);
 249                         return tbl;
 250                 }
 251         }
 252         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 253
 254         return NULL;
 255 }
 256
 257 /* This function retrieves the pointer to an entry in Rx reordering
 258  * table which matches the given TA and deletes it.
 259  */
 260 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 261 {
 262         struct mwifiex_rx_reorder_tbl *tbl, *tmp;
 263         unsigned long flags;
 264
 265         if (!ta)
 266                 return;
 267
 268         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 269         list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
 270                 if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
 271                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 272                                                flags);
 273                         mwifiex_del_rx_reorder_entry(priv, tbl);
 274                         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 275                 }
 276         }
 277         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 278
 279         return;
 280 }
 281
 282 /*
 283  * This function finds the last sequence number used in the packets
 284  * buffered in Rx reordering table.
 285  */
 286 static int
 287 mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
 288 {
 289         struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
 290         struct mwifiex_private *priv = ctx->priv;
 291         unsigned long flags;
 292         int i;
 293
 294         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 295         for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
 296                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
 297                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 298                                                flags);
 299                         return i;
 300                 }
 301         }
 302         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 303
 304         return -1;
 305 }
 306
 307 /*
 308  * This function flushes all the packets in Rx reordering table.
 309  *
 310  * The function checks if any packets are currently buffered in the
 311  * table or not. In case there are packets available, it dispatches
 312  * them and then dumps the Rx reordering table.
 313  */
 314 static void
 315 mwifiex_flush_data(struct timer_list *t)
 316 {
 317         struct reorder_tmr_cnxt *ctx =
 318                 from_timer(ctx, t, timer);
 319         int start_win, seq_num;
 320
 321         ctx->timer_is_set = false;
 322         seq_num = mwifiex_11n_find_last_seq_num(ctx);
 323
 324         if (seq_num < 0)
 325                 return;
 326
 327         mwifiex_dbg(ctx->priv->adapter, INFO, "info: flush data %d\n", seq_num);
 328         start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
 329         mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
 330                                                  start_win);
 331 }
 332
 333 /*
 334  * This function creates an entry in Rx reordering table for the
 335  * given TA/TID.
 336  *
 337  * The function also initializes the entry with sequence number, window
 338  * size as well as initializes the timer.
 339  *
 340  * If the received TA/TID pair is already present, all the packets are
 341  * dispatched and the window size is moved until the SSN.
 342  */
 343 static void
 344 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 345                                   int tid, int win_size, int seq_num)
 346 {
 347         int i;
 348         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 349         u16 last_seq = 0;
 350         unsigned long flags;
 351         struct mwifiex_sta_node *node;
 352
 353         /*
 354          * If we get a TID, ta pair which is already present dispatch all the
 355          * the packets and move the window size until the ssn
 356          */
 357         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 358         if (tbl) {
 359                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
 360                 return;
 361         }
 362         /* if !tbl then create one */
 363         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 364         if (!new_node)
 365                 return;
 366
 367         INIT_LIST_HEAD(&new_node->list);
 368         new_node->tid = tid;
 369         memcpy(new_node->ta, ta, ETH_ALEN);
 370         new_node->start_win = seq_num;
 371         new_node->init_win = seq_num;
 372         new_node->flags = 0;
 373
 374         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 375         if (mwifiex_queuing_ra_based(priv)) {
 376                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
 377                         node = mwifiex_get_sta_entry(priv, ta);
 378                         if (node)
 379                                 last_seq = node->rx_seq[tid];
 380                 }
 381         } else {
 382                 node = mwifiex_get_sta_entry(priv, ta);
 383                 if (node)
 384                         last_seq = node->rx_seq[tid];
 385                 else
 386                         last_seq = priv->rx_seq[tid];
 387         }
 388         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 389
 390         mwifiex_dbg(priv->adapter, INFO,
 391                     "info: last_seq=%d start_win=%d\n",
 392                     last_seq, new_node->start_win);
 393
 394         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 395             last_seq >= new_node->start_win) {
 396                 new_node->start_win = last_seq + 1;
 397                 new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
 398         }
 399
 400         new_node->win_size = win_size;
 401
 402         new_node->rx_reorder_ptr = kcalloc(win_size, sizeof(void *),
 403                                            GFP_KERNEL);
 404         if (!new_node->rx_reorder_ptr) {
 405                 kfree((u8 *) new_node);
 406                 mwifiex_dbg(priv->adapter, ERROR,
 407                             "%s: failed to alloc reorder_ptr\n", __func__);
 408                 return;
 409         }
 410
 411         new_node->timer_context.ptr = new_node;
 412         new_node->timer_context.priv = priv;
 413         new_node->timer_context.timer_is_set = false;
 414
 415         timer_setup(&new_node->timer_context.timer, mwifiex_flush_data, 0);
 416
 417         for (i = 0; i < win_size; ++i)
 418                 new_node->rx_reorder_ptr[i] = NULL;
 419
 420         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 421         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 422         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 423 }
 424
 425 static void
 426 mwifiex_11n_rxreorder_timer_restart(struct mwifiex_rx_reorder_tbl *tbl)
 427 {
 428         u32 min_flush_time;
 429
 430         if (tbl->win_size >= MWIFIEX_BA_WIN_SIZE_32)
 431                 min_flush_time = MIN_FLUSH_TIMER_15_MS;
 432         else
 433                 min_flush_time = MIN_FLUSH_TIMER_MS;
 434
 435         mod_timer(&tbl->timer_context.timer,
 436                   jiffies + msecs_to_jiffies(min_flush_time * tbl->win_size));
 437
 438         tbl->timer_context.timer_is_set = true;
 439 }
 440
 441 /*
 442  * This function prepares command for adding a BA request.
 443  *
 444  * Preparation includes -
 445  *      - Setting command ID and proper size
 446  *      - Setting add BA request buffer
 447  *      - Ensuring correct endian-ness
 448  */
 449 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 450 {
 451         struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
 452
 453         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 454         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 455         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 456
 457         return 0;
 458 }
 459
 460 /*
 461  * This function prepares command for adding a BA response.
 462  *
 463  * Preparation includes -
 464  *      - Setting command ID and proper size
 465  *      - Setting add BA response buffer
 466  *      - Ensuring correct endian-ness
 467  */
 468 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 469                                   struct host_cmd_ds_command *cmd,
 470                                   struct host_cmd_ds_11n_addba_req
 471                                   *cmd_addba_req)
 472 {
 473         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
 474         struct mwifiex_sta_node *sta_ptr;
 475         u32 rx_win_size = priv->add_ba_param.rx_win_size;
 476         u8 tid;
 477         int win_size;
 478         unsigned long flags;
 479         uint16_t block_ack_param_set;
 480
 481         if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 482             ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 483             priv->adapter->is_hw_11ac_capable &&
 484             memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
 485                 spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 486                 sta_ptr = mwifiex_get_sta_entry(priv,
 487                                                 cmd_addba_req->peer_mac_addr);
 488                 if (!sta_ptr) {
 489                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 490                         mwifiex_dbg(priv->adapter, ERROR,
 491                                     "BA setup with unknown TDLS peer %pM!\n",
 492                                     cmd_addba_req->peer_mac_addr);
 493                         return -1;
 494                 }
 495                 if (sta_ptr->is_11ac_enabled)
 496                         rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
 497                 spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 498         }
 499
 500         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 501         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 502
 503         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 504                ETH_ALEN);
 505         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 506         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 507         add_ba_rsp->ssn = cmd_addba_req->ssn;
 508
 509         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 510         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 511                 >> BLOCKACKPARAM_TID_POS;
 512         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 513         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 514
 515         /* If we don't support AMSDU inside AMPDU, reset the bit */
 516         if (!priv->add_ba_param.rx_amsdu ||
 517             (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
 518                 block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 519         block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
 520         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 521         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 522                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 523                                         >> BLOCKACKPARAM_WINSIZE_POS;
 524         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 525
 526         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 527                                           tid, win_size,
 528                                           le16_to_cpu(cmd_addba_req->ssn));
 529         return 0;
 530 }
 531
 532 /*
 533  * This function prepares command for deleting a BA request.
 534  *
 535  * Preparation includes -
 536  *      - Setting command ID and proper size
 537  *      - Setting del BA request buffer
 538  *      - Ensuring correct endian-ness
 539  */
 540 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 541 {
 542         struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
 543
 544         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 545         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 546         memcpy(del_ba, data_buf, sizeof(*del_ba));
 547
 548         return 0;
 549 }
 550
 551 /*
 552  * This function identifies if Rx reordering is needed for a received packet.
 553  *
 554  * In case reordering is required, the function will do the reordering
 555  * before sending it to kernel.
 556  *
 557  * The Rx reorder table is checked first with the received TID/TA pair. If
 558  * not found, the received packet is dispatched immediately. But if found,
 559  * the packet is reordered and all the packets in the updated Rx reordering
 560  * table is dispatched until a hole is found.
 561  *
 562  * For sequence number less than the starting window, the packet is dropped.
 563  */
 564 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 565                                 u16 seq_num, u16 tid,
 566                                 u8 *ta, u8 pkt_type, void *payload)
 567 {
 568         struct mwifiex_rx_reorder_tbl *tbl;
 569         int prev_start_win, start_win, end_win, win_size;
 570         u16 pkt_index;
 571         bool init_window_shift = false;
 572         int ret = 0;
 573
 574         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 575         if (!tbl) {
 576                 if (pkt_type != PKT_TYPE_BAR)
 577                         mwifiex_11n_dispatch_pkt(priv, payload);
 578                 return ret;
 579         }
 580
 581         if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
 582                 mwifiex_11n_dispatch_pkt(priv, payload);
 583                 return ret;
 584         }
 585
 586         start_win = tbl->start_win;
 587         prev_start_win = start_win;
 588         win_size = tbl->win_size;
 589         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 590         if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
 591                 init_window_shift = true;
 592                 tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
 593         }
 594
 595         if (tbl->flags & RXREOR_FORCE_NO_DROP) {
 596                 mwifiex_dbg(priv->adapter, INFO,
 597                             "RXREOR_FORCE_NO_DROP when HS is activated\n");
 598                 tbl->flags &= ~RXREOR_FORCE_NO_DROP;
 599         } else if (init_window_shift && seq_num < start_win &&
 600                    seq_num >= tbl->init_win) {
 601                 mwifiex_dbg(priv->adapter, INFO,
 602                             "Sender TID sequence number reset %d->%d for SSN %d\n",
 603                             start_win, seq_num, tbl->init_win);
 604                 tbl->start_win = start_win = seq_num;
 605                 end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 606         } else {
 607                 /*
 608                  * If seq_num is less then starting win then ignore and drop
 609                  * the packet
 610                  */
 611                 if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
 612                         if (seq_num >= ((start_win + TWOPOW11) &
 613                                         (MAX_TID_VALUE - 1)) &&
 614                             seq_num < start_win) {
 615                                 ret = -1;
 616                                 goto done;
 617                         }
 618                 } else if ((seq_num < start_win) ||
 619                            (seq_num >= (start_win + TWOPOW11))) {
 620                         ret = -1;
 621                         goto done;
 622                 }
 623         }
 624
 625         /*
 626          * If this packet is a BAR we adjust seq_num as
 627          * WinStart = seq_num
 628          */
 629         if (pkt_type == PKT_TYPE_BAR)
 630                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 631
 632         if (((end_win < start_win) &&
 633              (seq_num < start_win) && (seq_num > end_win)) ||
 634             ((end_win > start_win) && ((seq_num > end_win) ||
 635                                        (seq_num < start_win)))) {
 636                 end_win = seq_num;
 637                 if (((end_win - win_size) + 1) >= 0)
 638                         start_win = (end_win - win_size) + 1;
 639                 else
 640                         start_win = (MAX_TID_VALUE - (win_size - end_win)) + 1;
 641                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 642         }
 643
 644         if (pkt_type != PKT_TYPE_BAR) {
 645                 if (seq_num >= start_win)
 646                         pkt_index = seq_num - start_win;
 647                 else
 648                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 649
 650                 if (tbl->rx_reorder_ptr[pkt_index]) {
 651                         ret = -1;
 652                         goto done;
 653                 }
 654
 655                 tbl->rx_reorder_ptr[pkt_index] = payload;
 656         }
 657
 658         /*
 659          * Dispatch all packets sequentially from start_win until a
 660          * hole is found and adjust the start_win appropriately
 661          */
 662         mwifiex_11n_scan_and_dispatch(priv, tbl);
 663
 664 done:
 665         if (!tbl->timer_context.timer_is_set ||
 666             prev_start_win != tbl->start_win)
 667                 mwifiex_11n_rxreorder_timer_restart(tbl);
 668         return ret;
 669 }
 670
 671 /*
 672  * This function deletes an entry for a given TID/TA pair.
 673  *
 674  * The TID/TA are taken from del BA event body.
 675  */
 676 void
 677 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 678                    u8 type, int initiator)
 679 {
 680         struct mwifiex_rx_reorder_tbl *tbl;
 681         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 682         struct mwifiex_ra_list_tbl *ra_list;
 683         u8 cleanup_rx_reorder_tbl;
 684         unsigned long flags;
 685         int tid_down;
 686
 687         if (type == TYPE_DELBA_RECEIVE)
 688                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 689         else
 690                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 691
 692         mwifiex_dbg(priv->adapter, EVENT, "event: DELBA: %pM tid=%d initiator=%d\n",
 693                     peer_mac, tid, initiator);
 694
 695         if (cleanup_rx_reorder_tbl) {
 696                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 697                                                                  peer_mac);
 698                 if (!tbl) {
 699                         mwifiex_dbg(priv->adapter, EVENT,
 700                                     "event: TID, TA not found in table\n");
 701                         return;
 702                 }
 703                 mwifiex_del_rx_reorder_entry(priv, tbl);
 704         } else {
 705                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 706                 if (!ptx_tbl) {
 707                         mwifiex_dbg(priv->adapter, EVENT,
 708                                     "event: TID, RA not found in table\n");
 709                         return;
 710                 }
 711
 712                 tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 713                 ra_list = mwifiex_wmm_get_ralist_node(priv, tid_down, peer_mac);
 714                 if (ra_list) {
 715                         ra_list->amsdu_in_ampdu = false;
 716                         ra_list->ba_status = BA_SETUP_NONE;
 717                 }
 718                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 719                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 720                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 721         }
 722 }
 723
 724 /*
 725  * This function handles the command response of an add BA response.
 726  *
 727  * Handling includes changing the header fields into CPU format and
 728  * creating the stream, provided the add BA is accepted.
 729  */
 730 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 731                                struct host_cmd_ds_command *resp)
 732 {
 733         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 734         int tid, win_size;
 735         struct mwifiex_rx_reorder_tbl *tbl;
 736         uint16_t block_ack_param_set;
 737
 738         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 739
 740         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 741                 >> BLOCKACKPARAM_TID_POS;
 742         /*
 743          * Check if we had rejected the ADDBA, if yes then do not create
 744          * the stream
 745          */
 746         if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
 747                 mwifiex_dbg(priv->adapter, ERROR, "ADDBA RSP: failed %pM tid=%d)\n",
 748                             add_ba_rsp->peer_mac_addr, tid);
 749
 750                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 751                                                      add_ba_rsp->peer_mac_addr);
 752                 if (tbl)
 753                         mwifiex_del_rx_reorder_entry(priv, tbl);
 754
 755                 return 0;
 756         }
 757
 758         win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 759                     >> BLOCKACKPARAM_WINSIZE_POS;
 760
 761         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 762                                              add_ba_rsp->peer_mac_addr);
 763         if (tbl) {
 764                 if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
 765                     priv->add_ba_param.rx_amsdu &&
 766                     (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
 767                         tbl->amsdu = true;
 768                 else
 769                         tbl->amsdu = false;
 770         }
 771
 772         mwifiex_dbg(priv->adapter, CMD,
 773                     "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 774                 add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);
 775
 776         return 0;
 777 }
 778
 779 /*
 780  * This function handles BA stream timeout event by preparing and sending
 781  * a command to the firmware.
 782  */
 783 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 784                                    struct host_cmd_ds_11n_batimeout *event)
 785 {
 786         struct host_cmd_ds_11n_delba delba;
 787
 788         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 789         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 790
 791         delba.del_ba_param_set |=
 792                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 793         delba.del_ba_param_set |= cpu_to_le16(
 794                 (u16) event->origninator << DELBA_INITIATOR_POS);
 795         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 796         mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
 797 }
 798
 799 /*
 800  * This function cleans up the Rx reorder table by deleting all the entries
 801  * and re-initializing.
 802  */
 803 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 804 {
 805         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 806         unsigned long flags;
 807
 808         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 809         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 810                                  &priv->rx_reorder_tbl_ptr, list) {
 811                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 812                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 813                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 814         }
 815         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 816         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 817
 818         mwifiex_reset_11n_rx_seq_num(priv);
 819 }
 820
 821 /*
 822  * This function updates all rx_reorder_tbl's flags.
 823  */
 824 void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
 825 {
 826         struct mwifiex_private *priv;
 827         struct mwifiex_rx_reorder_tbl *tbl;
 828         unsigned long lock_flags;
 829         int i;
 830
 831         for (i = 0; i < adapter->priv_num; i++) {
 832                 priv = adapter->priv[i];
 833                 if (!priv)
 834                         continue;
 835
 836                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
 837                 list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
 838                         tbl->flags = flags;
 839                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
 840         }
 841
 842         return;
 843 }
 844
 845 /* This function update all the rx_win_size based on coex flag
 846  */
 847 static void mwifiex_update_ampdu_rxwinsize(struct mwifiex_adapter *adapter,
 848                                            bool coex_flag)
 849 {
 850         u8 i;
 851         u32 rx_win_size;
 852         struct mwifiex_private *priv;
 853
 854         dev_dbg(adapter->dev, "Update rxwinsize %d\n", coex_flag);
 855
 856         for (i = 0; i < adapter->priv_num; i++) {
 857                 if (!adapter->priv[i])
 858                         continue;
 859                 priv = adapter->priv[i];
 860                 rx_win_size = priv->add_ba_param.rx_win_size;
 861                 if (coex_flag) {
 862                         if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
 863                                 priv->add_ba_param.rx_win_size =
 864                                         MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
 865                         if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
 866                                 priv->add_ba_param.rx_win_size =
 867                                         MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
 868                         if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
 869                                 priv->add_ba_param.rx_win_size =
 870                                         MWIFIEX_UAP_COEX_AMPDU_DEF_RXWINSIZE;
 871                 } else {
 872                         if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
 873                                 priv->add_ba_param.rx_win_size =
 874                                         MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
 875                         if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
 876                                 priv->add_ba_param.rx_win_size =
 877                                         MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
 878                         if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
 879                                 priv->add_ba_param.rx_win_size =
 880                                         MWIFIEX_UAP_AMPDU_DEF_RXWINSIZE;
 881                 }
 882
 883                 if (adapter->coex_win_size && adapter->coex_rx_win_size)
 884                         priv->add_ba_param.rx_win_size =
 885                                         adapter->coex_rx_win_size;
 886
 887                 if (rx_win_size != priv->add_ba_param.rx_win_size) {
 888                         if (!priv->media_connected)
 889                                 continue;
 890                         for (i = 0; i < MAX_NUM_TID; i++)
 891                                 mwifiex_11n_delba(priv, i);
 892                 }
 893         }
 894 }
 895
 896 /* This function check coex for RX BA
 897  */
 898 void mwifiex_coex_ampdu_rxwinsize(struct mwifiex_adapter *adapter)
 899 {
 900         u8 i;
 901         struct mwifiex_private *priv;
 902         u8 count = 0;
 903
 904         for (i = 0; i < adapter->priv_num; i++) {
 905                 if (adapter->priv[i]) {
 906                         priv = adapter->priv[i];
 907                         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
 908                                 if (priv->media_connected)
 909                                         count++;
 910                         }
 911                         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
 912                                 if (priv->bss_started)
 913                                         count++;
 914                         }
 915                 }
 916                 if (count >= MWIFIEX_BSS_COEX_COUNT)
 917                         break;
 918         }
 919         if (count >= MWIFIEX_BSS_COEX_COUNT)
 920                 mwifiex_update_ampdu_rxwinsize(adapter, true);
 921         else
 922                 mwifiex_update_ampdu_rxwinsize(adapter, false);
 923 }
 924
 925 /* This function handles rxba_sync event
 926  */
 927 void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv,
 928                                  u8 *event_buf, u16 len)
 929 {
 930         struct mwifiex_ie_types_rxba_sync *tlv_rxba = (void *)event_buf;
 931         u16 tlv_type, tlv_len;
 932         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
 933         u8 i, j;
 934         u16 seq_num, tlv_seq_num, tlv_bitmap_len;
 935         int tlv_buf_left = len;
 936         int ret;
 937         u8 *tmp;
 938
 939         mwifiex_dbg_dump(priv->adapter, EVT_D, "RXBA_SYNC event:",
 940                          event_buf, len);
 941         while (tlv_buf_left >= sizeof(*tlv_rxba)) {
 942                 tlv_type = le16_to_cpu(tlv_rxba->header.type);
 943                 tlv_len  = le16_to_cpu(tlv_rxba->header.len);
 944                 if (tlv_type != TLV_TYPE_RXBA_SYNC) {
 945                         mwifiex_dbg(priv->adapter, ERROR,
 946                                     "Wrong TLV id=0x%x\n", tlv_type);
 947                         return;
 948                 }
 949
 950                 tlv_seq_num = le16_to_cpu(tlv_rxba->seq_num);
 951                 tlv_bitmap_len = le16_to_cpu(tlv_rxba->bitmap_len);
 952                 mwifiex_dbg(priv->adapter, INFO,
 953                             "%pM tid=%d seq_num=%d bitmap_len=%d\n",
 954                             tlv_rxba->mac, tlv_rxba->tid, tlv_seq_num,
 955                             tlv_bitmap_len);
 956
 957                 rx_reor_tbl_ptr =
 958                         mwifiex_11n_get_rx_reorder_tbl(priv, tlv_rxba->tid,
 959                                                        tlv_rxba->mac);
 960                 if (!rx_reor_tbl_ptr) {
 961                         mwifiex_dbg(priv->adapter, ERROR,
 962                                     "Can not find rx_reorder_tbl!");
 963                         return;
 964                 }
 965
 966                 for (i = 0; i < tlv_bitmap_len; i++) {
 967                         for (j = 0 ; j < 8; j++) {
 968                                 if (tlv_rxba->bitmap[i] & (1 << j)) {
 969                                         seq_num = (MAX_TID_VALUE - 1) &
 970                                                 (tlv_seq_num + i * 8 + j);
 971
 972                                         mwifiex_dbg(priv->adapter, ERROR,
 973                                                     "drop packet,seq=%d\n",
 974                                                     seq_num);
 975
 976                                         ret = mwifiex_11n_rx_reorder_pkt
 977                                         (priv, seq_num, tlv_rxba->tid,
 978                                          tlv_rxba->mac, 0, NULL);
 979
 980                                         if (ret)
 981                                                 mwifiex_dbg(priv->adapter,
 982                                                             ERROR,
 983                                                             "Fail to drop packet");
 984                                 }
 985                         }
 986                 }
 987
 988                 tlv_buf_left -= (sizeof(*tlv_rxba) + tlv_len);
 989                 tmp = (u8 *)tlv_rxba + tlv_len + sizeof(*tlv_rxba);
 990                 tlv_rxba = (struct mwifiex_ie_types_rxba_sync *)tmp;
 991         }
 992 }