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_reorder_tbl_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_reorder_tbl_lock, flags);
 128                 if (rx_tmp_ptr)
 129                         mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 130         }
 131
 132         spin_lock_irqsave(&priv->rx_reorder_tbl_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_reorder_tbl_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_reorder_tbl_lock, flags);
 164                 if (!tbl->rx_reorder_ptr[i]) {
 165                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 166                                                flags);
 167                         break;
 168                 }
 169                 rx_tmp_ptr = tbl->rx_reorder_ptr[i];
 170                 tbl->rx_reorder_ptr[i] = NULL;
 171                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 172                 mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
 173         }
 174
 175         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 176         /*
 177          * We don't have a circular buffer, hence use rotation to simulate
 178          * circular buffer
 179          */
 180         if (i > 0) {
 181                 xchg = tbl->win_size - i;
 182                 for (j = 0; j < xchg; ++j) {
 183                         tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
 184                         tbl->rx_reorder_ptr[i + j] = NULL;
 185                 }
 186         }
 187         tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
 188         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 189 }
 190
 191 /*
 192  * This function deletes the Rx reorder table and frees the memory.
 193  *
 194  * The function stops the associated timer and dispatches all the
 195  * pending packets in the Rx reorder table before deletion.
 196  */
 197 static void
 198 mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
 199                              struct mwifiex_rx_reorder_tbl *tbl)
 200 {
 201         unsigned long flags;
 202         int start_win;
 203
 204         if (!tbl)
 205                 return;
 206
 207         spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
 208         priv->adapter->rx_locked = true;
 209         if (priv->adapter->rx_processing) {
 210                 spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 211                 flush_workqueue(priv->adapter->rx_workqueue);
 212         } else {
 213                 spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 214         }
 215
 216         start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
 217         mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 218
 219         del_timer_sync(&tbl->timer_context.timer);
 220         tbl->timer_context.timer_is_set = false;
 221
 222         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 223         list_del(&tbl->list);
 224         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 225
 226         kfree(tbl->rx_reorder_ptr);
 227         kfree(tbl);
 228
 229         spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
 230         priv->adapter->rx_locked = false;
 231         spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
 232
 233 }
 234
 235 /*
 236  * This function returns the pointer to an entry in Rx reordering
 237  * table which matches the given TA/TID pair.
 238  */
 239 struct mwifiex_rx_reorder_tbl *
 240 mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
 241 {
 242         struct mwifiex_rx_reorder_tbl *tbl;
 243         unsigned long flags;
 244
 245         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 246         list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
 247                 if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
 248                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 249                                                flags);
 250                         return tbl;
 251                 }
 252         }
 253         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 254
 255         return NULL;
 256 }
 257
 258 /* This function retrieves the pointer to an entry in Rx reordering
 259  * table which matches the given TA and deletes it.
 260  */
 261 void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
 262 {
 263         struct mwifiex_rx_reorder_tbl *tbl, *tmp;
 264         unsigned long flags;
 265
 266         if (!ta)
 267                 return;
 268
 269         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 270         list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
 271                 if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
 272                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 273                                                flags);
 274                         mwifiex_del_rx_reorder_entry(priv, tbl);
 275                         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 276                 }
 277         }
 278         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 279
 280         return;
 281 }
 282
 283 /*
 284  * This function finds the last sequence number used in the packets
 285  * buffered in Rx reordering table.
 286  */
 287 static int
 288 mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
 289 {
 290         struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
 291         struct mwifiex_private *priv = ctx->priv;
 292         unsigned long flags;
 293         int i;
 294
 295         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 296         for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
 297                 if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
 298                         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
 299                                                flags);
 300                         return i;
 301                 }
 302         }
 303         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 304
 305         return -1;
 306 }
 307
 308 /*
 309  * This function flushes all the packets in Rx reordering table.
 310  *
 311  * The function checks if any packets are currently buffered in the
 312  * table or not. In case there are packets available, it dispatches
 313  * them and then dumps the Rx reordering table.
 314  */
 315 static void
 316 mwifiex_flush_data(struct timer_list *t)
 317 {
 318         struct reorder_tmr_cnxt *ctx =
 319                 from_timer(ctx, t, timer);
 320         int start_win, seq_num;
 321
 322         ctx->timer_is_set = false;
 323         seq_num = mwifiex_11n_find_last_seq_num(ctx);
 324
 325         if (seq_num < 0)
 326                 return;
 327
 328         mwifiex_dbg(ctx->priv->adapter, INFO, "info: flush data %d\n", seq_num);
 329         start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
 330         mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
 331                                                  start_win);
 332 }
 333
 334 /*
 335  * This function creates an entry in Rx reordering table for the
 336  * given TA/TID.
 337  *
 338  * The function also initializes the entry with sequence number, window
 339  * size as well as initializes the timer.
 340  *
 341  * If the received TA/TID pair is already present, all the packets are
 342  * dispatched and the window size is moved until the SSN.
 343  */
 344 static void
 345 mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
 346                                   int tid, int win_size, int seq_num)
 347 {
 348         int i;
 349         struct mwifiex_rx_reorder_tbl *tbl, *new_node;
 350         u16 last_seq = 0;
 351         unsigned long flags;
 352         struct mwifiex_sta_node *node;
 353
 354         /*
 355          * If we get a TID, ta pair which is already present dispatch all the
 356          * the packets and move the window size until the ssn
 357          */
 358         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 359         if (tbl) {
 360                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
 361                 return;
 362         }
 363         /* if !tbl then create one */
 364         new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
 365         if (!new_node)
 366                 return;
 367
 368         INIT_LIST_HEAD(&new_node->list);
 369         new_node->tid = tid;
 370         memcpy(new_node->ta, ta, ETH_ALEN);
 371         new_node->start_win = seq_num;
 372         new_node->init_win = seq_num;
 373         new_node->flags = 0;
 374
 375         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 376         if (mwifiex_queuing_ra_based(priv)) {
 377                 if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
 378                         node = mwifiex_get_sta_entry(priv, ta);
 379                         if (node)
 380                                 last_seq = node->rx_seq[tid];
 381                 }
 382         } else {
 383                 node = mwifiex_get_sta_entry(priv, ta);
 384                 if (node)
 385                         last_seq = node->rx_seq[tid];
 386                 else
 387                         last_seq = priv->rx_seq[tid];
 388         }
 389         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 390
 391         mwifiex_dbg(priv->adapter, INFO,
 392                     "info: last_seq=%d start_win=%d\n",
 393                     last_seq, new_node->start_win);
 394
 395         if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
 396             last_seq >= new_node->start_win) {
 397                 new_node->start_win = last_seq + 1;
 398                 new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
 399         }
 400
 401         new_node->win_size = win_size;
 402
 403         new_node->rx_reorder_ptr = kcalloc(win_size, sizeof(void *),
 404                                            GFP_KERNEL);
 405         if (!new_node->rx_reorder_ptr) {
 406                 kfree((u8 *) new_node);
 407                 mwifiex_dbg(priv->adapter, ERROR,
 408                             "%s: failed to alloc reorder_ptr\n", __func__);
 409                 return;
 410         }
 411
 412         new_node->timer_context.ptr = new_node;
 413         new_node->timer_context.priv = priv;
 414         new_node->timer_context.timer_is_set = false;
 415
 416         timer_setup(&new_node->timer_context.timer, mwifiex_flush_data, 0);
 417
 418         for (i = 0; i < win_size; ++i)
 419                 new_node->rx_reorder_ptr[i] = NULL;
 420
 421         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 422         list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
 423         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 424 }
 425
 426 static void
 427 mwifiex_11n_rxreorder_timer_restart(struct mwifiex_rx_reorder_tbl *tbl)
 428 {
 429         u32 min_flush_time;
 430
 431         if (tbl->win_size >= MWIFIEX_BA_WIN_SIZE_32)
 432                 min_flush_time = MIN_FLUSH_TIMER_15_MS;
 433         else
 434                 min_flush_time = MIN_FLUSH_TIMER_MS;
 435
 436         mod_timer(&tbl->timer_context.timer,
 437                   jiffies + msecs_to_jiffies(min_flush_time * tbl->win_size));
 438
 439         tbl->timer_context.timer_is_set = true;
 440 }
 441
 442 /*
 443  * This function prepares command for adding a BA request.
 444  *
 445  * Preparation includes -
 446  *      - Setting command ID and proper size
 447  *      - Setting add BA request buffer
 448  *      - Ensuring correct endian-ness
 449  */
 450 int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
 451 {
 452         struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;
 453
 454         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
 455         cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
 456         memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));
 457
 458         return 0;
 459 }
 460
 461 /*
 462  * This function prepares command for adding a BA response.
 463  *
 464  * Preparation includes -
 465  *      - Setting command ID and proper size
 466  *      - Setting add BA response buffer
 467  *      - Ensuring correct endian-ness
 468  */
 469 int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
 470                                   struct host_cmd_ds_command *cmd,
 471                                   struct host_cmd_ds_11n_addba_req
 472                                   *cmd_addba_req)
 473 {
 474         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
 475         struct mwifiex_sta_node *sta_ptr;
 476         u32 rx_win_size = priv->add_ba_param.rx_win_size;
 477         u8 tid;
 478         int win_size;
 479         unsigned long flags;
 480         uint16_t block_ack_param_set;
 481
 482         if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
 483             ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 484             priv->adapter->is_hw_11ac_capable &&
 485             memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
 486                 spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 487                 sta_ptr = mwifiex_get_sta_entry(priv,
 488                                                 cmd_addba_req->peer_mac_addr);
 489                 if (!sta_ptr) {
 490                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 491                         mwifiex_dbg(priv->adapter, ERROR,
 492                                     "BA setup with unknown TDLS peer %pM!\n",
 493                                     cmd_addba_req->peer_mac_addr);
 494                         return -1;
 495                 }
 496                 if (sta_ptr->is_11ac_enabled)
 497                         rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
 498                 spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 499         }
 500
 501         cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
 502         cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);
 503
 504         memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
 505                ETH_ALEN);
 506         add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
 507         add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
 508         add_ba_rsp->ssn = cmd_addba_req->ssn;
 509
 510         block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
 511         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 512                 >> BLOCKACKPARAM_TID_POS;
 513         add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
 514         block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;
 515
 516         /* If we don't support AMSDU inside AMPDU, reset the bit */
 517         if (!priv->add_ba_param.rx_amsdu ||
 518             (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
 519                 block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
 520         block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
 521         add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 522         win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
 523                                         & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 524                                         >> BLOCKACKPARAM_WINSIZE_POS;
 525         cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);
 526
 527         mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
 528                                           tid, win_size,
 529                                           le16_to_cpu(cmd_addba_req->ssn));
 530         return 0;
 531 }
 532
 533 /*
 534  * This function prepares command for deleting a BA request.
 535  *
 536  * Preparation includes -
 537  *      - Setting command ID and proper size
 538  *      - Setting del BA request buffer
 539  *      - Ensuring correct endian-ness
 540  */
 541 int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
 542 {
 543         struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;
 544
 545         cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
 546         cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
 547         memcpy(del_ba, data_buf, sizeof(*del_ba));
 548
 549         return 0;
 550 }
 551
 552 /*
 553  * This function identifies if Rx reordering is needed for a received packet.
 554  *
 555  * In case reordering is required, the function will do the reordering
 556  * before sending it to kernel.
 557  *
 558  * The Rx reorder table is checked first with the received TID/TA pair. If
 559  * not found, the received packet is dispatched immediately. But if found,
 560  * the packet is reordered and all the packets in the updated Rx reordering
 561  * table is dispatched until a hole is found.
 562  *
 563  * For sequence number less than the starting window, the packet is dropped.
 564  */
 565 int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
 566                                 u16 seq_num, u16 tid,
 567                                 u8 *ta, u8 pkt_type, void *payload)
 568 {
 569         struct mwifiex_rx_reorder_tbl *tbl;
 570         int prev_start_win, start_win, end_win, win_size;
 571         u16 pkt_index;
 572         bool init_window_shift = false;
 573         int ret = 0;
 574
 575         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
 576         if (!tbl) {
 577                 if (pkt_type != PKT_TYPE_BAR)
 578                         mwifiex_11n_dispatch_pkt(priv, payload);
 579                 return ret;
 580         }
 581
 582         if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
 583                 mwifiex_11n_dispatch_pkt(priv, payload);
 584                 return ret;
 585         }
 586
 587         start_win = tbl->start_win;
 588         prev_start_win = start_win;
 589         win_size = tbl->win_size;
 590         end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 591         if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
 592                 init_window_shift = true;
 593                 tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
 594         }
 595
 596         if (tbl->flags & RXREOR_FORCE_NO_DROP) {
 597                 mwifiex_dbg(priv->adapter, INFO,
 598                             "RXREOR_FORCE_NO_DROP when HS is activated\n");
 599                 tbl->flags &= ~RXREOR_FORCE_NO_DROP;
 600         } else if (init_window_shift && seq_num < start_win &&
 601                    seq_num >= tbl->init_win) {
 602                 mwifiex_dbg(priv->adapter, INFO,
 603                             "Sender TID sequence number reset %d->%d for SSN %d\n",
 604                             start_win, seq_num, tbl->init_win);
 605                 tbl->start_win = start_win = seq_num;
 606                 end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
 607         } else {
 608                 /*
 609                  * If seq_num is less then starting win then ignore and drop
 610                  * the packet
 611                  */
 612                 if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
 613                         if (seq_num >= ((start_win + TWOPOW11) &
 614                                         (MAX_TID_VALUE - 1)) &&
 615                             seq_num < start_win) {
 616                                 ret = -1;
 617                                 goto done;
 618                         }
 619                 } else if ((seq_num < start_win) ||
 620                            (seq_num >= (start_win + TWOPOW11))) {
 621                         ret = -1;
 622                         goto done;
 623                 }
 624         }
 625
 626         /*
 627          * If this packet is a BAR we adjust seq_num as
 628          * WinStart = seq_num
 629          */
 630         if (pkt_type == PKT_TYPE_BAR)
 631                 seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);
 632
 633         if (((end_win < start_win) &&
 634              (seq_num < start_win) && (seq_num > end_win)) ||
 635             ((end_win > start_win) && ((seq_num > end_win) ||
 636                                        (seq_num < start_win)))) {
 637                 end_win = seq_num;
 638                 if (((end_win - win_size) + 1) >= 0)
 639                         start_win = (end_win - win_size) + 1;
 640                 else
 641                         start_win = (MAX_TID_VALUE - (win_size - end_win)) + 1;
 642                 mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
 643         }
 644
 645         if (pkt_type != PKT_TYPE_BAR) {
 646                 if (seq_num >= start_win)
 647                         pkt_index = seq_num - start_win;
 648                 else
 649                         pkt_index = (seq_num+MAX_TID_VALUE) - start_win;
 650
 651                 if (tbl->rx_reorder_ptr[pkt_index]) {
 652                         ret = -1;
 653                         goto done;
 654                 }
 655
 656                 tbl->rx_reorder_ptr[pkt_index] = payload;
 657         }
 658
 659         /*
 660          * Dispatch all packets sequentially from start_win until a
 661          * hole is found and adjust the start_win appropriately
 662          */
 663         mwifiex_11n_scan_and_dispatch(priv, tbl);
 664
 665 done:
 666         if (!tbl->timer_context.timer_is_set ||
 667             prev_start_win != tbl->start_win)
 668                 mwifiex_11n_rxreorder_timer_restart(tbl);
 669         return ret;
 670 }
 671
 672 /*
 673  * This function deletes an entry for a given TID/TA pair.
 674  *
 675  * The TID/TA are taken from del BA event body.
 676  */
 677 void
 678 mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
 679                    u8 type, int initiator)
 680 {
 681         struct mwifiex_rx_reorder_tbl *tbl;
 682         struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
 683         struct mwifiex_ra_list_tbl *ra_list;
 684         u8 cleanup_rx_reorder_tbl;
 685         unsigned long flags;
 686         int tid_down;
 687
 688         if (type == TYPE_DELBA_RECEIVE)
 689                 cleanup_rx_reorder_tbl = (initiator) ? true : false;
 690         else
 691                 cleanup_rx_reorder_tbl = (initiator) ? false : true;
 692
 693         mwifiex_dbg(priv->adapter, EVENT, "event: DELBA: %pM tid=%d initiator=%d\n",
 694                     peer_mac, tid, initiator);
 695
 696         if (cleanup_rx_reorder_tbl) {
 697                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 698                                                                  peer_mac);
 699                 if (!tbl) {
 700                         mwifiex_dbg(priv->adapter, EVENT,
 701                                     "event: TID, TA not found in table\n");
 702                         return;
 703                 }
 704                 mwifiex_del_rx_reorder_entry(priv, tbl);
 705         } else {
 706                 ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
 707                 if (!ptx_tbl) {
 708                         mwifiex_dbg(priv->adapter, EVENT,
 709                                     "event: TID, RA not found in table\n");
 710                         return;
 711                 }
 712
 713                 tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 714                 ra_list = mwifiex_wmm_get_ralist_node(priv, tid_down, peer_mac);
 715                 if (ra_list) {
 716                         ra_list->amsdu_in_ampdu = false;
 717                         ra_list->ba_status = BA_SETUP_NONE;
 718                 }
 719                 spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
 720                 mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
 721                 spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
 722         }
 723 }
 724
 725 /*
 726  * This function handles the command response of an add BA response.
 727  *
 728  * Handling includes changing the header fields into CPU format and
 729  * creating the stream, provided the add BA is accepted.
 730  */
 731 int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
 732                                struct host_cmd_ds_command *resp)
 733 {
 734         struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
 735         int tid, win_size;
 736         struct mwifiex_rx_reorder_tbl *tbl;
 737         uint16_t block_ack_param_set;
 738
 739         block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);
 740
 741         tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
 742                 >> BLOCKACKPARAM_TID_POS;
 743         /*
 744          * Check if we had rejected the ADDBA, if yes then do not create
 745          * the stream
 746          */
 747         if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
 748                 mwifiex_dbg(priv->adapter, ERROR, "ADDBA RSP: failed %pM tid=%d)\n",
 749                             add_ba_rsp->peer_mac_addr, tid);
 750
 751                 tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 752                                                      add_ba_rsp->peer_mac_addr);
 753                 if (tbl)
 754                         mwifiex_del_rx_reorder_entry(priv, tbl);
 755
 756                 return 0;
 757         }
 758
 759         win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
 760                     >> BLOCKACKPARAM_WINSIZE_POS;
 761
 762         tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
 763                                              add_ba_rsp->peer_mac_addr);
 764         if (tbl) {
 765                 if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
 766                     priv->add_ba_param.rx_amsdu &&
 767                     (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
 768                         tbl->amsdu = true;
 769                 else
 770                         tbl->amsdu = false;
 771         }
 772
 773         mwifiex_dbg(priv->adapter, CMD,
 774                     "cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
 775                 add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);
 776
 777         return 0;
 778 }
 779
 780 /*
 781  * This function handles BA stream timeout event by preparing and sending
 782  * a command to the firmware.
 783  */
 784 void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
 785                                    struct host_cmd_ds_11n_batimeout *event)
 786 {
 787         struct host_cmd_ds_11n_delba delba;
 788
 789         memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
 790         memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);
 791
 792         delba.del_ba_param_set |=
 793                 cpu_to_le16((u16) event->tid << DELBA_TID_POS);
 794         delba.del_ba_param_set |= cpu_to_le16(
 795                 (u16) event->origninator << DELBA_INITIATOR_POS);
 796         delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
 797         mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
 798 }
 799
 800 /*
 801  * This function cleans up the Rx reorder table by deleting all the entries
 802  * and re-initializing.
 803  */
 804 void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
 805 {
 806         struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
 807         unsigned long flags;
 808
 809         spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 810         list_for_each_entry_safe(del_tbl_ptr, tmp_node,
 811                                  &priv->rx_reorder_tbl_ptr, list) {
 812                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 813                 mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
 814                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
 815         }
 816         INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 817         spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
 818
 819         mwifiex_reset_11n_rx_seq_num(priv);
 820 }
 821
 822 /*
 823  * This function updates all rx_reorder_tbl's flags.
 824  */
 825 void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
 826 {
 827         struct mwifiex_private *priv;
 828         struct mwifiex_rx_reorder_tbl *tbl;
 829         unsigned long lock_flags;
 830         int i;
 831
 832         for (i = 0; i < adapter->priv_num; i++) {
 833                 priv = adapter->priv[i];
 834                 if (!priv)
 835                         continue;
 836
 837                 spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
 838                 list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
 839                         tbl->flags = flags;
 840                 spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
 841         }
 842
 843         return;
 844 }
 845
 846 /* This function update all the rx_win_size based on coex flag
 847  */
 848 static void mwifiex_update_ampdu_rxwinsize(struct mwifiex_adapter *adapter,
 849                                            bool coex_flag)
 850 {
 851         u8 i;
 852         u32 rx_win_size;
 853         struct mwifiex_private *priv;
 854
 855         dev_dbg(adapter->dev, "Update rxwinsize %d\n", coex_flag);
 856
 857         for (i = 0; i < adapter->priv_num; i++) {
 858                 if (!adapter->priv[i])
 859                         continue;
 860                 priv = adapter->priv[i];
 861                 rx_win_size = priv->add_ba_param.rx_win_size;
 862                 if (coex_flag) {
 863                         if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
 864                                 priv->add_ba_param.rx_win_size =
 865                                         MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
 866                         if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
 867                                 priv->add_ba_param.rx_win_size =
 868                                         MWIFIEX_STA_COEX_AMPDU_DEF_RXWINSIZE;
 869                         if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
 870                                 priv->add_ba_param.rx_win_size =
 871                                         MWIFIEX_UAP_COEX_AMPDU_DEF_RXWINSIZE;
 872                 } else {
 873                         if (priv->bss_type == MWIFIEX_BSS_TYPE_STA)
 874                                 priv->add_ba_param.rx_win_size =
 875                                         MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
 876                         if (priv->bss_type == MWIFIEX_BSS_TYPE_P2P)
 877                                 priv->add_ba_param.rx_win_size =
 878                                         MWIFIEX_STA_AMPDU_DEF_RXWINSIZE;
 879                         if (priv->bss_type == MWIFIEX_BSS_TYPE_UAP)
 880                                 priv->add_ba_param.rx_win_size =
 881                                         MWIFIEX_UAP_AMPDU_DEF_RXWINSIZE;
 882                 }
 883
 884                 if (adapter->coex_win_size && adapter->coex_rx_win_size)
 885                         priv->add_ba_param.rx_win_size =
 886                                         adapter->coex_rx_win_size;
 887
 888                 if (rx_win_size != priv->add_ba_param.rx_win_size) {
 889                         if (!priv->media_connected)
 890                                 continue;
 891                         for (i = 0; i < MAX_NUM_TID; i++)
 892                                 mwifiex_11n_delba(priv, i);
 893                 }
 894         }
 895 }
 896
 897 /* This function check coex for RX BA
 898  */
 899 void mwifiex_coex_ampdu_rxwinsize(struct mwifiex_adapter *adapter)
 900 {
 901         u8 i;
 902         struct mwifiex_private *priv;
 903         u8 count = 0;
 904
 905         for (i = 0; i < adapter->priv_num; i++) {
 906                 if (adapter->priv[i]) {
 907                         priv = adapter->priv[i];
 908                         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
 909                                 if (priv->media_connected)
 910                                         count++;
 911                         }
 912                         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
 913                                 if (priv->bss_started)
 914                                         count++;
 915                         }
 916                 }
 917                 if (count >= MWIFIEX_BSS_COEX_COUNT)
 918                         break;
 919         }
 920         if (count >= MWIFIEX_BSS_COEX_COUNT)
 921                 mwifiex_update_ampdu_rxwinsize(adapter, true);
 922         else
 923                 mwifiex_update_ampdu_rxwinsize(adapter, false);
 924 }
 925
 926 /* This function handles rxba_sync event
 927  */
 928 void mwifiex_11n_rxba_sync_event(struct mwifiex_private *priv,
 929                                  u8 *event_buf, u16 len)
 930 {
 931         struct mwifiex_ie_types_rxba_sync *tlv_rxba = (void *)event_buf;
 932         u16 tlv_type, tlv_len;
 933         struct mwifiex_rx_reorder_tbl *rx_reor_tbl_ptr;
 934         u8 i, j;
 935         u16 seq_num, tlv_seq_num, tlv_bitmap_len;
 936         int tlv_buf_left = len;
 937         int ret;
 938         u8 *tmp;
 939
 940         mwifiex_dbg_dump(priv->adapter, EVT_D, "RXBA_SYNC event:",
 941                          event_buf, len);
 942         while (tlv_buf_left >= sizeof(*tlv_rxba)) {
 943                 tlv_type = le16_to_cpu(tlv_rxba->header.type);
 944                 tlv_len  = le16_to_cpu(tlv_rxba->header.len);
 945                 if (tlv_type != TLV_TYPE_RXBA_SYNC) {
 946                         mwifiex_dbg(priv->adapter, ERROR,
 947                                     "Wrong TLV id=0x%x\n", tlv_type);
 948                         return;
 949                 }
 950
 951                 tlv_seq_num = le16_to_cpu(tlv_rxba->seq_num);
 952                 tlv_bitmap_len = le16_to_cpu(tlv_rxba->bitmap_len);
 953                 mwifiex_dbg(priv->adapter, INFO,
 954                             "%pM tid=%d seq_num=%d bitmap_len=%d\n",
 955                             tlv_rxba->mac, tlv_rxba->tid, tlv_seq_num,
 956                             tlv_bitmap_len);
 957
 958                 rx_reor_tbl_ptr =
 959                         mwifiex_11n_get_rx_reorder_tbl(priv, tlv_rxba->tid,
 960                                                        tlv_rxba->mac);
 961                 if (!rx_reor_tbl_ptr) {
 962                         mwifiex_dbg(priv->adapter, ERROR,
 963                                     "Can not find rx_reorder_tbl!");
 964                         return;
 965                 }
 966
 967                 for (i = 0; i < tlv_bitmap_len; i++) {
 968                         for (j = 0 ; j < 8; j++) {
 969                                 if (tlv_rxba->bitmap[i] & (1 << j)) {
 970                                         seq_num = (MAX_TID_VALUE - 1) &
 971                                                 (tlv_seq_num + i * 8 + j);
 972
 973                                         mwifiex_dbg(priv->adapter, ERROR,
 974                                                     "drop packet,seq=%d\n",
 975                                                     seq_num);
 976
 977                                         ret = mwifiex_11n_rx_reorder_pkt
 978                                         (priv, seq_num, tlv_rxba->tid,
 979                                          tlv_rxba->mac, 0, NULL);
 980
 981                                         if (ret)
 982                                                 mwifiex_dbg(priv->adapter,
 983                                                             ERROR,
 984                                                             "Fail to drop packet");
 985                                 }
 986                         }
 987                 }
 988
 989                 tlv_buf_left -= (sizeof(*tlv_rxba) + tlv_len);
 990                 tmp = (u8 *)tlv_rxba + tlv_len + sizeof(*tlv_rxba);
 991                 tlv_rxba = (struct mwifiex_ie_types_rxba_sync *)tmp;
 992         }
 993 }