drivers/net/wireless/mwifiex/wmm.c

   1 /*
   2  * Marvell Wireless LAN device driver: WMM
   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
  28
  29 /* Maximum value FW can accept for driver delay in packet transmission */
  30 #define DRV_PKT_DELAY_TO_FW_MAX   512
  31
  32
  33 #define WMM_QUEUED_PACKET_LOWER_LIMIT   180
  34
  35 #define WMM_QUEUED_PACKET_UPPER_LIMIT   200
  36
  37 /* Offset for TOS field in the IP header */
  38 #define IPTOS_OFFSET 5
  39
  40 /* WMM information IE */
  41 static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
  42         0x00, 0x50, 0xf2, 0x02,
  43         0x00, 0x01, 0x00
  44 };
  45
  46 static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
  47         WMM_AC_BK,
  48         WMM_AC_VI,
  49         WMM_AC_VO
  50 };
  51
  52 static u8 tos_to_tid[] = {
  53         /* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
  54         0x01,                   /* 0 1 0 AC_BK */
  55         0x02,                   /* 0 0 0 AC_BK */
  56         0x00,                   /* 0 0 1 AC_BE */
  57         0x03,                   /* 0 1 1 AC_BE */
  58         0x04,                   /* 1 0 0 AC_VI */
  59         0x05,                   /* 1 0 1 AC_VI */
  60         0x06,                   /* 1 1 0 AC_VO */
  61         0x07                    /* 1 1 1 AC_VO */
  62 };
  63
  64 /*
  65  * This table inverses the tos_to_tid operation to get a priority
  66  * which is in sequential order, and can be compared.
  67  * Use this to compare the priority of two different TIDs.
  68  */
  69 static u8 tos_to_tid_inv[] = {
  70         0x02,  /* from tos_to_tid[2] = 0 */
  71         0x00,  /* from tos_to_tid[0] = 1 */
  72         0x01,  /* from tos_to_tid[1] = 2 */
  73         0x03,
  74         0x04,
  75         0x05,
  76         0x06,
  77         0x07};
  78
  79 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
  80
  81 /*
  82  * This function debug prints the priority parameters for a WMM AC.
  83  */
  84 static void
  85 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
  86 {
  87         const char *ac_str[] = { "BK", "BE", "VI", "VO" };
  88
  89         pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
  90                "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
  91                ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
  92                & MWIFIEX_ACI) >> 5]],
  93                (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
  94                (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
  95                ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
  96                ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
  97                (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
  98                le16_to_cpu(ac_param->tx_op_limit));
  99 }
 100
 101 /*
 102  * This function allocates a route address list.
 103  *
 104  * The function also initializes the list with the provided RA.
 105  */
 106 static struct mwifiex_ra_list_tbl *
 107 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
 108 {
 109         struct mwifiex_ra_list_tbl *ra_list;
 110
 111         ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
 112
 113         if (!ra_list) {
 114                 dev_err(adapter->dev, "%s: failed to alloc ra_list\n",
 115                                                 __func__);
 116                 return NULL;
 117         }
 118         INIT_LIST_HEAD(&ra_list->list);
 119         skb_queue_head_init(&ra_list->skb_head);
 120
 121         memcpy(ra_list->ra, ra, ETH_ALEN);
 122
 123         ra_list->total_pkts_size = 0;
 124         ra_list->total_pkts = 0;
 125
 126         dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 127
 128         return ra_list;
 129 }
 130
 131 /*
 132  * This function allocates and adds a RA list for all TIDs
 133  * with the given RA.
 134  */
 135 void
 136 mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 137 {
 138         int i;
 139         struct mwifiex_ra_list_tbl *ra_list;
 140         struct mwifiex_adapter *adapter = priv->adapter;
 141
 142         for (i = 0; i < MAX_NUM_TID; ++i) {
 143                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 144                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 145
 146                 if (!ra_list)
 147                         break;
 148
 149                 if (!mwifiex_queuing_ra_based(priv))
 150                         ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 151                 else
 152                         ra_list->is_11n_enabled = false;
 153
 154                 dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 155                         ra_list, ra_list->is_11n_enabled);
 156
 157                 list_add_tail(&ra_list->list,
 158                                 &priv->wmm.tid_tbl_ptr[i].ra_list);
 159
 160                 if (!priv->wmm.tid_tbl_ptr[i].ra_list_curr)
 161                         priv->wmm.tid_tbl_ptr[i].ra_list_curr = ra_list;
 162         }
 163 }
 164
 165 /*
 166  * This function sets the WMM queue priorities to their default values.
 167  */
 168 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 169 {
 170         /* Default queue priorities: VO->VI->BE->BK */
 171         priv->wmm.queue_priority[0] = WMM_AC_VO;
 172         priv->wmm.queue_priority[1] = WMM_AC_VI;
 173         priv->wmm.queue_priority[2] = WMM_AC_BE;
 174         priv->wmm.queue_priority[3] = WMM_AC_BK;
 175 }
 176
 177 /*
 178  * This function map ACs to TIDs.
 179  */
 180 static void
 181 mwifiex_wmm_queue_priorities_tid(struct mwifiex_wmm_desc *wmm)
 182 {
 183         u8 *queue_priority = wmm->queue_priority;
 184         int i;
 185
 186         for (i = 0; i < 4; ++i) {
 187                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 188                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 189         }
 190
 191         for (i = 0; i < MAX_NUM_TID; ++i)
 192                 tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 193
 194         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 195 }
 196
 197 /*
 198  * This function initializes WMM priority queues.
 199  */
 200 void
 201 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 202                                    struct ieee_types_wmm_parameter *wmm_ie)
 203 {
 204         u16 cw_min, avg_back_off, tmp[4];
 205         u32 i, j, num_ac;
 206         u8 ac_idx;
 207
 208         if (!wmm_ie || !priv->wmm_enabled) {
 209                 /* WMM is not enabled, just set the defaults and return */
 210                 mwifiex_wmm_default_queue_priorities(priv);
 211                 return;
 212         }
 213
 214         dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
 215                 "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 216                 wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 217                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 218                 wmm_ie->reserved);
 219
 220         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 221                 cw_min = (1 << (wmm_ie->ac_params[num_ac].ecw_bitmap &
 222                         MWIFIEX_ECW_MIN)) - 1;
 223                 avg_back_off = (cw_min >> 1) +
 224                         (wmm_ie->ac_params[num_ac].aci_aifsn_bitmap &
 225                         MWIFIEX_AIFSN);
 226
 227                 ac_idx = wmm_aci_to_qidx_map[(wmm_ie->ac_params[num_ac].
 228                                              aci_aifsn_bitmap &
 229                                              MWIFIEX_ACI) >> 5];
 230                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 231                 tmp[ac_idx] = avg_back_off;
 232
 233                 dev_dbg(priv->adapter->dev, "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 234                        (1 << ((wmm_ie->ac_params[num_ac].ecw_bitmap &
 235                        MWIFIEX_ECW_MAX) >> 4)) - 1,
 236                        cw_min, avg_back_off);
 237                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 238         }
 239
 240         /* Bubble sort */
 241         for (i = 0; i < num_ac; i++) {
 242                 for (j = 1; j < num_ac - i; j++) {
 243                         if (tmp[j - 1] > tmp[j]) {
 244                                 swap(tmp[j - 1], tmp[j]);
 245                                 swap(priv->wmm.queue_priority[j - 1],
 246                                      priv->wmm.queue_priority[j]);
 247                         } else if (tmp[j - 1] == tmp[j]) {
 248                                 if (priv->wmm.queue_priority[j - 1]
 249                                     < priv->wmm.queue_priority[j])
 250                                         swap(priv->wmm.queue_priority[j - 1],
 251                                              priv->wmm.queue_priority[j]);
 252                         }
 253                 }
 254         }
 255
 256         mwifiex_wmm_queue_priorities_tid(&priv->wmm);
 257 }
 258
 259 /*
 260  * This function evaluates whether or not an AC is to be downgraded.
 261  *
 262  * In case the AC is not enabled, the highest AC is returned that is
 263  * enabled and does not require admission control.
 264  */
 265 static enum mwifiex_wmm_ac_e
 266 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 267                               enum mwifiex_wmm_ac_e eval_ac)
 268 {
 269         int down_ac;
 270         enum mwifiex_wmm_ac_e ret_ac;
 271         struct mwifiex_wmm_ac_status *ac_status;
 272
 273         ac_status = &priv->wmm.ac_status[eval_ac];
 274
 275         if (!ac_status->disabled)
 276                 /* Okay to use this AC, its enabled */
 277                 return eval_ac;
 278
 279         /* Setup a default return value of the lowest priority */
 280         ret_ac = WMM_AC_BK;
 281
 282         /*
 283          *  Find the highest AC that is enabled and does not require
 284          *  admission control. The spec disallows downgrading to an AC,
 285          *  which is enabled due to a completed admission control.
 286          *  Unadmitted traffic is not to be sent on an AC with admitted
 287          *  traffic.
 288          */
 289         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 290                 ac_status = &priv->wmm.ac_status[down_ac];
 291
 292                 if (!ac_status->disabled && !ac_status->flow_required)
 293                         /* AC is enabled and does not require admission
 294                            control */
 295                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 296         }
 297
 298         return ret_ac;
 299 }
 300
 301 /*
 302  * This function downgrades WMM priority queue.
 303  */
 304 void
 305 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 306 {
 307         int ac_val;
 308
 309         dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
 310                         "BK(0), BE(1), VI(2), VO(3)\n");
 311
 312         if (!priv->wmm_enabled) {
 313                 /* WMM is not enabled, default priorities */
 314                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 315                         priv->wmm.ac_down_graded_vals[ac_val] =
 316                                 (enum mwifiex_wmm_ac_e) ac_val;
 317         } else {
 318                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 319                         priv->wmm.ac_down_graded_vals[ac_val]
 320                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 321                                                 (enum mwifiex_wmm_ac_e) ac_val);
 322                         dev_dbg(priv->adapter->dev, "info: WMM: AC PRIO %d maps to %d\n",
 323                                 ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
 324                 }
 325         }
 326 }
 327
 328 /*
 329  * This function converts the IP TOS field to an WMM AC
 330  * Queue assignment.
 331  */
 332 static enum mwifiex_wmm_ac_e
 333 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 334 {
 335         /* Map of TOS UP values to WMM AC */
 336         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 337                 WMM_AC_BK,
 338                 WMM_AC_BK,
 339                 WMM_AC_BE,
 340                 WMM_AC_VI,
 341                 WMM_AC_VI,
 342                 WMM_AC_VO,
 343                 WMM_AC_VO
 344         };
 345
 346         if (tos >= ARRAY_SIZE(tos_to_ac))
 347                 return WMM_AC_BE;
 348
 349         return tos_to_ac[tos];
 350 }
 351
 352 /*
 353  * This function evaluates a given TID and downgrades it to a lower
 354  * TID if the WMM Parameter IE received from the AP indicates that the
 355  * AP is disabled (due to call admission control (ACM bit). Mapping
 356  * of TID to AC is taken care of internally.
 357  */
 358 static u8
 359 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 360 {
 361         enum mwifiex_wmm_ac_e ac, ac_down;
 362         u8 new_tid;
 363
 364         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 365         ac_down = priv->wmm.ac_down_graded_vals[ac];
 366
 367         /* Send the index to tid array, picking from the array will be
 368          * taken care by dequeuing function
 369          */
 370         new_tid = ac_to_tid[ac_down][tid % 2];
 371
 372         return new_tid;
 373 }
 374
 375 /*
 376  * This function initializes the WMM state information and the
 377  * WMM data path queues.
 378  */
 379 void
 380 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 381 {
 382         int i, j;
 383         struct mwifiex_private *priv;
 384
 385         for (j = 0; j < adapter->priv_num; ++j) {
 386                 priv = adapter->priv[j];
 387                 if (!priv)
 388                         continue;
 389
 390                 for (i = 0; i < MAX_NUM_TID; ++i) {
 391                         priv->aggr_prio_tbl[i].amsdu = tos_to_tid_inv[i];
 392                         priv->aggr_prio_tbl[i].ampdu_ap = tos_to_tid_inv[i];
 393                         priv->aggr_prio_tbl[i].ampdu_user = tos_to_tid_inv[i];
 394                         priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
 395                 }
 396
 397                 priv->aggr_prio_tbl[6].amsdu
 398                         = priv->aggr_prio_tbl[6].ampdu_ap
 399                         = priv->aggr_prio_tbl[6].ampdu_user
 400                         = BA_STREAM_NOT_ALLOWED;
 401
 402                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 403                         = priv->aggr_prio_tbl[7].ampdu_user
 404                         = BA_STREAM_NOT_ALLOWED;
 405
 406                 priv->add_ba_param.timeout = MWIFIEX_DEFAULT_BLOCK_ACK_TIMEOUT;
 407                 priv->add_ba_param.tx_win_size = MWIFIEX_AMPDU_DEF_TXWINSIZE;
 408                 priv->add_ba_param.rx_win_size = MWIFIEX_AMPDU_DEF_RXWINSIZE;
 409
 410                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 411                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 412         }
 413 }
 414
 415 /*
 416  * This function checks if WMM Tx queue is empty.
 417  */
 418 int
 419 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 420 {
 421         int i;
 422         struct mwifiex_private *priv;
 423
 424         for (i = 0; i < adapter->priv_num; ++i) {
 425                 priv = adapter->priv[i];
 426                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 427                                 return false;
 428         }
 429
 430         return true;
 431 }
 432
 433 /*
 434  * This function deletes all packets in an RA list node.
 435  *
 436  * The packet sent completion callback handler are called with
 437  * status failure, after they are dequeued to ensure proper
 438  * cleanup. The RA list node itself is freed at the end.
 439  */
 440 static void
 441 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 442                                     struct mwifiex_ra_list_tbl *ra_list)
 443 {
 444         struct mwifiex_adapter *adapter = priv->adapter;
 445         struct sk_buff *skb, *tmp;
 446
 447         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 448                 mwifiex_write_data_complete(adapter, skb, -1);
 449 }
 450
 451 /*
 452  * This function deletes all packets in an RA list.
 453  *
 454  * Each nodes in the RA list are freed individually first, and then
 455  * the RA list itself is freed.
 456  */
 457 static void
 458 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 459                                struct list_head *ra_list_head)
 460 {
 461         struct mwifiex_ra_list_tbl *ra_list;
 462
 463         list_for_each_entry(ra_list, ra_list_head, list)
 464                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 465 }
 466
 467 /*
 468  * This function deletes all packets in all RA lists.
 469  */
 470 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 471 {
 472         int i;
 473
 474         for (i = 0; i < MAX_NUM_TID; i++)
 475                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 476                                                      ra_list);
 477
 478         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 479         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 480 }
 481
 482 /*
 483  * This function deletes all route addresses from all RA lists.
 484  */
 485 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 486 {
 487         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 488         int i;
 489
 490         for (i = 0; i < MAX_NUM_TID; ++i) {
 491                 dev_dbg(priv->adapter->dev,
 492                                 "info: ra_list: freeing buf for tid %d\n", i);
 493                 list_for_each_entry_safe(ra_list, tmp_node,
 494                                 &priv->wmm.tid_tbl_ptr[i].ra_list, list) {
 495                         list_del(&ra_list->list);
 496                         kfree(ra_list);
 497                 }
 498
 499                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 500
 501                 priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
 502         }
 503 }
 504
 505 /*
 506  * This function cleans up the Tx and Rx queues.
 507  *
 508  * Cleanup includes -
 509  *      - All packets in RA lists
 510  *      - All entries in Rx reorder table
 511  *      - All entries in Tx BA stream table
 512  *      - MPA buffer (if required)
 513  *      - All RA lists
 514  */
 515 void
 516 mwifiex_clean_txrx(struct mwifiex_private *priv)
 517 {
 518         unsigned long flags;
 519
 520         mwifiex_11n_cleanup_reorder_tbl(priv);
 521         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 522
 523         mwifiex_wmm_cleanup_queues(priv);
 524         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 525
 526         if (priv->adapter->if_ops.cleanup_mpa_buf)
 527                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 528
 529         mwifiex_wmm_delete_all_ralist(priv);
 530         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 531
 532         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 533 }
 534
 535 /*
 536  * This function retrieves a particular RA list node, matching with the
 537  * given TID and RA address.
 538  */
 539 static struct mwifiex_ra_list_tbl *
 540 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 541                             u8 *ra_addr)
 542 {
 543         struct mwifiex_ra_list_tbl *ra_list;
 544
 545         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 546                             list) {
 547                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 548                         return ra_list;
 549         }
 550
 551         return NULL;
 552 }
 553
 554 /*
 555  * This function retrieves an RA list node for a given TID and
 556  * RA address pair.
 557  *
 558  * If no such node is found, a new node is added first and then
 559  * retrieved.
 560  */
 561 static struct mwifiex_ra_list_tbl *
 562 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, u8 *ra_addr)
 563 {
 564         struct mwifiex_ra_list_tbl *ra_list;
 565
 566         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 567         if (ra_list)
 568                 return ra_list;
 569         mwifiex_ralist_add(priv, ra_addr);
 570
 571         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 572 }
 573
 574 /*
 575  * This function checks if a particular RA list node exists in a given TID
 576  * table index.
 577  */
 578 int
 579 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 580                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 581 {
 582         struct mwifiex_ra_list_tbl *rlist;
 583
 584         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 585                             list) {
 586                 if (rlist == ra_list)
 587                         return true;
 588         }
 589
 590         return false;
 591 }
 592
 593 /*
 594  * This function adds a packet to WMM queue.
 595  *
 596  * In disconnected state the packet is immediately dropped and the
 597  * packet send completion callback is called with status failure.
 598  *
 599  * Otherwise, the correct RA list node is located and the packet
 600  * is queued at the list tail.
 601  */
 602 void
 603 mwifiex_wmm_add_buf_txqueue(struct mwifiex_adapter *adapter,
 604                             struct sk_buff *skb)
 605 {
 606         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 607         struct mwifiex_private *priv = adapter->priv[tx_info->bss_index];
 608         u32 tid;
 609         struct mwifiex_ra_list_tbl *ra_list;
 610         u8 ra[ETH_ALEN], tid_down;
 611         unsigned long flags;
 612
 613         if (!priv->media_connected) {
 614                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 615                 mwifiex_write_data_complete(adapter, skb, -1);
 616                 return;
 617         }
 618
 619         tid = skb->priority;
 620
 621         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 622
 623         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 624
 625         /* In case of infra as we have already created the list during
 626            association we just don't have to call get_queue_raptr, we will
 627            have only 1 raptr for a tid in case of infra */
 628         if (!mwifiex_queuing_ra_based(priv)) {
 629                 if (!list_empty(&priv->wmm.tid_tbl_ptr[tid_down].ra_list))
 630                         ra_list = list_first_entry(
 631                                 &priv->wmm.tid_tbl_ptr[tid_down].ra_list,
 632                                 struct mwifiex_ra_list_tbl, list);
 633                 else
 634                         ra_list = NULL;
 635         } else {
 636                 memcpy(ra, skb->data, ETH_ALEN);
 637                 if (ra[0] & 0x01)
 638                         memset(ra, 0xff, ETH_ALEN);
 639                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 640         }
 641
 642         if (!ra_list) {
 643                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 644                 mwifiex_write_data_complete(adapter, skb, -1);
 645                 return;
 646         }
 647
 648         skb_queue_tail(&ra_list->skb_head, skb);
 649
 650         ra_list->total_pkts_size += skb->len;
 651         ra_list->total_pkts++;
 652
 653         atomic_inc(&priv->wmm.tx_pkts_queued);
 654
 655         if (atomic_read(&priv->wmm.highest_queued_prio) <
 656                                                 tos_to_tid_inv[tid_down])
 657                 atomic_set(&priv->wmm.highest_queued_prio,
 658                                                 tos_to_tid_inv[tid_down]);
 659
 660         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 661 }
 662
 663 /*
 664  * This function processes the get WMM status command response from firmware.
 665  *
 666  * The response may contain multiple TLVs -
 667  *      - AC Queue status TLVs
 668  *      - Current WMM Parameter IE TLV
 669  *      - Admission Control action frame TLVs
 670  *
 671  * This function parses the TLVs and then calls further specific functions
 672  * to process any changes in the queue prioritize or state.
 673  */
 674 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 675                                const struct host_cmd_ds_command *resp)
 676 {
 677         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 678         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 679         int valid = true;
 680
 681         struct mwifiex_ie_types_data *tlv_hdr;
 682         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 683         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 684         struct mwifiex_wmm_ac_status *ac_status;
 685
 686         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 687                         resp_len);
 688
 689         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 690                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 691                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 692
 693                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 694                 case TLV_TYPE_WMMQSTATUS:
 695                         tlv_wmm_qstatus =
 696                                 (struct mwifiex_ie_types_wmm_queue_status *)
 697                                 tlv_hdr;
 698                         dev_dbg(priv->adapter->dev,
 699                                 "info: CMD_RESP: WMM_GET_STATUS:"
 700                                 " QSTATUS TLV: %d, %d, %d\n",
 701                                tlv_wmm_qstatus->queue_index,
 702                                tlv_wmm_qstatus->flow_required,
 703                                tlv_wmm_qstatus->disabled);
 704
 705                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 706                                                          queue_index];
 707                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 708                         ac_status->flow_required =
 709                                 tlv_wmm_qstatus->flow_required;
 710                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 711                         break;
 712
 713                 case WLAN_EID_VENDOR_SPECIFIC:
 714                         /*
 715                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 716                          *   and setup the IEEE IE type and length byte fields
 717                          */
 718
 719                         wmm_param_ie =
 720                                 (struct ieee_types_wmm_parameter *) (curr +
 721                                                                     2);
 722                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 723                         wmm_param_ie->vend_hdr.element_id =
 724                                                 WLAN_EID_VENDOR_SPECIFIC;
 725
 726                         dev_dbg(priv->adapter->dev,
 727                                 "info: CMD_RESP: WMM_GET_STATUS:"
 728                                 " WMM Parameter Set Count: %d\n",
 729                                 wmm_param_ie->qos_info_bitmap &
 730                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 731
 732                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 733                                wmm_ie, wmm_param_ie,
 734                                wmm_param_ie->vend_hdr.len + 2);
 735
 736                         break;
 737
 738                 default:
 739                         valid = false;
 740                         break;
 741                 }
 742
 743                 curr += (tlv_len + sizeof(tlv_hdr->header));
 744                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 745         }
 746
 747         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 748         mwifiex_wmm_setup_ac_downgrade(priv);
 749
 750         return 0;
 751 }
 752
 753 /*
 754  * Callback handler from the command module to allow insertion of a WMM TLV.
 755  *
 756  * If the BSS we are associating to supports WMM, this function adds the
 757  * required WMM Information IE to the association request command buffer in
 758  * the form of a Marvell extended IEEE IE.
 759  */
 760 u32
 761 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 762                                     u8 **assoc_buf,
 763                                     struct ieee_types_wmm_parameter *wmm_ie,
 764                                     struct ieee80211_ht_cap *ht_cap)
 765 {
 766         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 767         u32 ret_len = 0;
 768
 769         /* Null checks */
 770         if (!assoc_buf)
 771                 return 0;
 772         if (!(*assoc_buf))
 773                 return 0;
 774
 775         if (!wmm_ie)
 776                 return 0;
 777
 778         dev_dbg(priv->adapter->dev, "info: WMM: process assoc req:"
 779                         "bss->wmmIe=0x%x\n",
 780                         wmm_ie->vend_hdr.element_id);
 781
 782         if ((priv->wmm_required
 783              || (ht_cap && (priv->adapter->config_bands & BAND_GN
 784                      || priv->adapter->config_bands & BAND_AN))
 785             )
 786             && wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 787                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 788                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 789                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 790                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 791                         le16_to_cpu(wmm_tlv->header.len));
 792                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 793                         memcpy((u8 *) (wmm_tlv->wmm_ie
 794                                         + le16_to_cpu(wmm_tlv->header.len)
 795                                          - sizeof(priv->wmm_qosinfo)),
 796                                         &priv->wmm_qosinfo,
 797                                         sizeof(priv->wmm_qosinfo));
 798
 799                 ret_len = sizeof(wmm_tlv->header)
 800                         + le16_to_cpu(wmm_tlv->header.len);
 801
 802                 *assoc_buf += ret_len;
 803         }
 804
 805         return ret_len;
 806 }
 807
 808 /*
 809  * This function computes the time delay in the driver queues for a
 810  * given packet.
 811  *
 812  * When the packet is received at the OS/Driver interface, the current
 813  * time is set in the packet structure. The difference between the present
 814  * time and that received time is computed in this function and limited
 815  * based on pre-compiled limits in the driver.
 816  */
 817 u8
 818 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 819                                         const struct sk_buff *skb)
 820 {
 821         u8 ret_val;
 822         struct timeval out_tstamp, in_tstamp;
 823         u32 queue_delay;
 824
 825         do_gettimeofday(&out_tstamp);
 826         in_tstamp = ktime_to_timeval(skb->tstamp);
 827
 828         queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
 829         queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;
 830
 831         /*
 832          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 833          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 834          *
 835          * Pass max value if queue_delay is beyond the uint8 range
 836          */
 837         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 838
 839         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 840                                 " %d ms sent to FW\n", queue_delay, ret_val);
 841
 842         return ret_val;
 843 }
 844
 845 /*
 846  * This function retrieves the highest priority RA list table pointer.
 847  */
 848 static struct mwifiex_ra_list_tbl *
 849 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 850                                      struct mwifiex_private **priv, int *tid)
 851 {
 852         struct mwifiex_private *priv_tmp;
 853         struct mwifiex_ra_list_tbl *ptr, *head;
 854         struct mwifiex_bss_prio_node *bssprio_node, *bssprio_head;
 855         struct mwifiex_tid_tbl *tid_ptr;
 856         int is_list_empty;
 857         unsigned long flags;
 858         int i, j;
 859
 860         for (j = adapter->priv_num - 1; j >= 0; --j) {
 861                 spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 862                                 flags);
 863                 is_list_empty = list_empty(&adapter->bss_prio_tbl[j]
 864                                 .bss_prio_head);
 865                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 866                                 flags);
 867                 if (is_list_empty)
 868                         continue;
 869
 870                 if (adapter->bss_prio_tbl[j].bss_prio_cur ==
 871                     (struct mwifiex_bss_prio_node *)
 872                     &adapter->bss_prio_tbl[j].bss_prio_head) {
 873                         bssprio_node =
 874                                 list_first_entry(&adapter->bss_prio_tbl[j]
 875                                                  .bss_prio_head,
 876                                                  struct mwifiex_bss_prio_node,
 877                                                  list);
 878                         bssprio_head = bssprio_node;
 879                 } else {
 880                         bssprio_node = adapter->bss_prio_tbl[j].bss_prio_cur;
 881                         bssprio_head = bssprio_node;
 882                 }
 883
 884                 do {
 885                         atomic_t *hqp;
 886                         spinlock_t *lock;
 887
 888                         priv_tmp = bssprio_node->priv;
 889                         hqp = &priv_tmp->wmm.highest_queued_prio;
 890                         lock = &priv_tmp->wmm.ra_list_spinlock;
 891
 892                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 893
 894                                 tid_ptr = &(priv_tmp)->wmm.
 895                                         tid_tbl_ptr[tos_to_tid[i]];
 896
 897                                 spin_lock_irqsave(&tid_ptr->tid_tbl_lock,
 898                                                   flags);
 899                                 is_list_empty =
 900                                         list_empty(&adapter->bss_prio_tbl[j]
 901                                                    .bss_prio_head);
 902                                 spin_unlock_irqrestore(&tid_ptr->tid_tbl_lock,
 903                                                        flags);
 904                                 if (is_list_empty)
 905                                         continue;
 906
 907                                 /*
 908                                  * Always choose the next ra we transmitted
 909                                  * last time, this way we pick the ra's in
 910                                  * round robin fashion.
 911                                  */
 912                                 ptr = list_first_entry(
 913                                                 &tid_ptr->ra_list_curr->list,
 914                                                 struct mwifiex_ra_list_tbl,
 915                                                 list);
 916
 917                                 head = ptr;
 918                                 if (ptr == (struct mwifiex_ra_list_tbl *)
 919                                                 &tid_ptr->ra_list) {
 920                                         /* Get next ra */
 921                                         ptr = list_first_entry(&ptr->list,
 922                                             struct mwifiex_ra_list_tbl, list);
 923                                         head = ptr;
 924                                 }
 925
 926                                 do {
 927                                         is_list_empty =
 928                                                 skb_queue_empty(&ptr->skb_head);
 929                                         if (!is_list_empty) {
 930                                                 spin_lock_irqsave(lock, flags);
 931                                                 if (atomic_read(hqp) > i)
 932                                                         atomic_set(hqp, i);
 933                                                 spin_unlock_irqrestore(lock,
 934                                                                         flags);
 935                                                 *priv = priv_tmp;
 936                                                 *tid = tos_to_tid[i];
 937                                                 return ptr;
 938                                         }
 939                                         /* Get next ra */
 940                                         ptr = list_first_entry(&ptr->list,
 941                                                  struct mwifiex_ra_list_tbl,
 942                                                  list);
 943                                         if (ptr ==
 944                                             (struct mwifiex_ra_list_tbl *)
 945                                             &tid_ptr->ra_list)
 946                                                 ptr = list_first_entry(
 947                                                     &ptr->list,
 948                                                     struct mwifiex_ra_list_tbl,
 949                                                     list);
 950                                 } while (ptr != head);
 951                         }
 952
 953                         /* No packet at any TID for this priv. Mark as such
 954                          * to skip checking TIDs for this priv (until pkt is
 955                          * added).
 956                          */
 957                         atomic_set(hqp, NO_PKT_PRIO_TID);
 958
 959                         /* Get next bss priority node */
 960                         bssprio_node = list_first_entry(&bssprio_node->list,
 961                                                 struct mwifiex_bss_prio_node,
 962                                                 list);
 963
 964                         if (bssprio_node ==
 965                             (struct mwifiex_bss_prio_node *)
 966                             &adapter->bss_prio_tbl[j].bss_prio_head)
 967                                 /* Get next bss priority node */
 968                                 bssprio_node = list_first_entry(
 969                                                 &bssprio_node->list,
 970                                                 struct mwifiex_bss_prio_node,
 971                                                 list);
 972                 } while (bssprio_node != bssprio_head);
 973         }
 974         return NULL;
 975 }
 976
 977 /*
 978  * This function sends a single packet to firmware for transmission.
 979  */
 980 static void
 981 mwifiex_send_single_packet(struct mwifiex_private *priv,
 982                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
 983                            unsigned long ra_list_flags)
 984                            __releases(&priv->wmm.ra_list_spinlock)
 985 {
 986         struct sk_buff *skb, *skb_next;
 987         struct mwifiex_tx_param tx_param;
 988         struct mwifiex_adapter *adapter = priv->adapter;
 989         struct mwifiex_txinfo *tx_info;
 990
 991         if (skb_queue_empty(&ptr->skb_head)) {
 992                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 993                                        ra_list_flags);
 994                 dev_dbg(adapter->dev, "data: nothing to send\n");
 995                 return;
 996         }
 997
 998         skb = skb_dequeue(&ptr->skb_head);
 999
1000         tx_info = MWIFIEX_SKB_TXCB(skb);
1001         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1002
1003         ptr->total_pkts_size -= skb->len;
1004         ptr->total_pkts--;
1005
1006         if (!skb_queue_empty(&ptr->skb_head))
1007                 skb_next = skb_peek(&ptr->skb_head);
1008         else
1009                 skb_next = NULL;
1010
1011         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1012
1013         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1014                                 sizeof(struct txpd) : 0);
1015
1016         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1017                 /* Queue the packet back at the head */
1018                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1019
1020                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1021                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1022                                                ra_list_flags);
1023                         mwifiex_write_data_complete(adapter, skb, -1);
1024                         return;
1025                 }
1026
1027                 skb_queue_tail(&ptr->skb_head, skb);
1028
1029                 ptr->total_pkts_size += skb->len;
1030                 ptr->total_pkts++;
1031                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1032                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1033                                        ra_list_flags);
1034         } else {
1035                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1036                 if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1037                         priv->wmm.packets_out[ptr_index]++;
1038                         priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
1039                 }
1040                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
1041                         list_first_entry(
1042                                 &adapter->bss_prio_tbl[priv->bss_priority]
1043                                 .bss_prio_cur->list,
1044                                 struct mwifiex_bss_prio_node,
1045                                 list);
1046                 atomic_dec(&priv->wmm.tx_pkts_queued);
1047                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1048                                        ra_list_flags);
1049         }
1050 }
1051
1052 /*
1053  * This function checks if the first packet in the given RA list
1054  * is already processed or not.
1055  */
1056 static int
1057 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1058                          struct mwifiex_ra_list_tbl *ptr)
1059 {
1060         struct sk_buff *skb;
1061         struct mwifiex_txinfo *tx_info;
1062
1063         if (skb_queue_empty(&ptr->skb_head))
1064                 return false;
1065
1066         skb = skb_peek(&ptr->skb_head);
1067
1068         tx_info = MWIFIEX_SKB_TXCB(skb);
1069         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1070                 return true;
1071
1072         return false;
1073 }
1074
1075 /*
1076  * This function sends a single processed packet to firmware for
1077  * transmission.
1078  */
1079 static void
1080 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1081                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1082                               unsigned long ra_list_flags)
1083                                 __releases(&priv->wmm.ra_list_spinlock)
1084 {
1085         struct mwifiex_tx_param tx_param;
1086         struct mwifiex_adapter *adapter = priv->adapter;
1087         int ret = -1;
1088         struct sk_buff *skb, *skb_next;
1089         struct mwifiex_txinfo *tx_info;
1090
1091         if (skb_queue_empty(&ptr->skb_head)) {
1092                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1093                                        ra_list_flags);
1094                 return;
1095         }
1096
1097         skb = skb_dequeue(&ptr->skb_head);
1098
1099         if (!skb_queue_empty(&ptr->skb_head))
1100                 skb_next = skb_peek(&ptr->skb_head);
1101         else
1102                 skb_next = NULL;
1103
1104         tx_info = MWIFIEX_SKB_TXCB(skb);
1105
1106         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1107         tx_param.next_pkt_len =
1108                 ((skb_next) ? skb_next->len +
1109                  sizeof(struct txpd) : 0);
1110         ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1111                                            skb->data, skb->len, &tx_param);
1112         switch (ret) {
1113         case -EBUSY:
1114                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1115                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1116
1117                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1118                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1119                                                ra_list_flags);
1120                         mwifiex_write_data_complete(adapter, skb, -1);
1121                         return;
1122                 }
1123
1124                 skb_queue_tail(&ptr->skb_head, skb);
1125
1126                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1127                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1128                                        ra_list_flags);
1129                 break;
1130         case -1:
1131                 adapter->data_sent = false;
1132                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1133                 adapter->dbg.num_tx_host_to_card_failure++;
1134                 mwifiex_write_data_complete(adapter, skb, ret);
1135                 break;
1136         case -EINPROGRESS:
1137                 adapter->data_sent = false;
1138         default:
1139                 break;
1140         }
1141         if (ret != -EBUSY) {
1142                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1143                 if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1144                         priv->wmm.packets_out[ptr_index]++;
1145                         priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
1146                 }
1147                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
1148                         list_first_entry(
1149                                 &adapter->bss_prio_tbl[priv->bss_priority]
1150                                 .bss_prio_cur->list,
1151                                 struct mwifiex_bss_prio_node,
1152                                 list);
1153                 atomic_dec(&priv->wmm.tx_pkts_queued);
1154                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1155                                        ra_list_flags);
1156         }
1157 }
1158
1159 /*
1160  * This function dequeues a packet from the highest priority list
1161  * and transmits it.
1162  */
1163 static int
1164 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1165 {
1166         struct mwifiex_ra_list_tbl *ptr;
1167         struct mwifiex_private *priv = NULL;
1168         int ptr_index = 0;
1169         u8 ra[ETH_ALEN];
1170         int tid_del = 0, tid = 0;
1171         unsigned long flags;
1172
1173         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1174         if (!ptr)
1175                 return -1;
1176
1177         tid = mwifiex_get_tid(ptr);
1178
1179         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1180
1181         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1182         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1183                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1184                 return -1;
1185         }
1186
1187         if (mwifiex_is_ptr_processed(priv, ptr)) {
1188                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1189                 /* ra_list_spinlock has been freed in
1190                    mwifiex_send_processed_packet() */
1191                 return 0;
1192         }
1193
1194         if (!ptr->is_11n_enabled || mwifiex_is_ba_stream_setup(priv, ptr, tid)
1195             || ((priv->sec_info.wpa_enabled
1196                   || priv->sec_info.wpa2_enabled) && !priv->wpa_is_gtk_set)
1197                 ) {
1198                 mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1199                 /* ra_list_spinlock has been freed in
1200                    mwifiex_send_single_packet() */
1201         } else {
1202                 if (mwifiex_is_ampdu_allowed(priv, tid)) {
1203                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1204                                 mwifiex_11n_create_tx_ba_stream_tbl(priv,
1205                                                 ptr->ra, tid,
1206                                                 BA_STREAM_SETUP_INPROGRESS);
1207                                 mwifiex_send_addba(priv, tid, ptr->ra);
1208                         } else if (mwifiex_find_stream_to_delete
1209                                    (priv, tid, &tid_del, ra)) {
1210                                 mwifiex_11n_create_tx_ba_stream_tbl(priv,
1211                                                 ptr->ra, tid,
1212                                                 BA_STREAM_SETUP_INPROGRESS);
1213                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1214                         }
1215                 }
1216 /* Minimum number of AMSDU */
1217 #define MIN_NUM_AMSDU 2
1218
1219                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1220                                 (ptr->total_pkts >= MIN_NUM_AMSDU))
1221                         mwifiex_11n_aggregate_pkt(priv, ptr, INTF_HEADER_LEN,
1222                                                   ptr_index, flags);
1223                         /* ra_list_spinlock has been freed in
1224                            mwifiex_11n_aggregate_pkt() */
1225                 else
1226                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1227                         /* ra_list_spinlock has been freed in
1228                            mwifiex_send_single_packet() */
1229         }
1230         return 0;
1231 }
1232
1233 /*
1234  * This function transmits the highest priority packet awaiting in the
1235  * WMM Queues.
1236  */
1237 void
1238 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1239 {
1240         do {
1241                 /* Check if busy */
1242                 if (adapter->data_sent || adapter->tx_lock_flag)
1243                         break;
1244
1245                 if (mwifiex_dequeue_tx_packet(adapter))
1246                         break;
1247         } while (!mwifiex_wmm_lists_empty(adapter));
1248 }