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         if (!ra_list)
 113                 return NULL;
 114
 115         INIT_LIST_HEAD(&ra_list->list);
 116         skb_queue_head_init(&ra_list->skb_head);
 117
 118         memcpy(ra_list->ra, ra, ETH_ALEN);
 119
 120         ra_list->total_pkts_size = 0;
 121
 122         dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 123
 124         return ra_list;
 125 }
 126
 127 /* This function returns random no between 16 and 32 to be used as threshold
 128  * for no of packets after which BA setup is initiated.
 129  */
 130 static u8 mwifiex_get_random_ba_threshold(void)
 131 {
 132         u32 sec, usec;
 133         struct timeval ba_tstamp;
 134         u8 ba_threshold;
 135
 136         /* setup ba_packet_threshold here random number between
 137          * [BA_SETUP_PACKET_OFFSET,
 138          * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
 139          */
 140
 141         do_gettimeofday(&ba_tstamp);
 142         sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
 143         usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
 144         ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
 145                                                       + BA_SETUP_PACKET_OFFSET;
 146
 147         return ba_threshold;
 148 }
 149
 150 /*
 151  * This function allocates and adds a RA list for all TIDs
 152  * with the given RA.
 153  */
 154 void
 155 mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 156 {
 157         int i;
 158         struct mwifiex_ra_list_tbl *ra_list;
 159         struct mwifiex_adapter *adapter = priv->adapter;
 160         struct mwifiex_sta_node *node;
 161         unsigned long flags;
 162
 163         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 164         node = mwifiex_get_sta_entry(priv, ra);
 165         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 166
 167         for (i = 0; i < MAX_NUM_TID; ++i) {
 168                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 169                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 170
 171                 if (!ra_list)
 172                         break;
 173
 174                 ra_list->is_11n_enabled = 0;
 175                 if (!mwifiex_queuing_ra_based(priv)) {
 176                         ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 177                 } else {
 178                         ra_list->is_11n_enabled =
 179                                       mwifiex_is_sta_11n_enabled(priv, node);
 180                         if (ra_list->is_11n_enabled)
 181                                 ra_list->max_amsdu = node->max_amsdu;
 182                 }
 183
 184                 dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 185                         ra_list, ra_list->is_11n_enabled);
 186
 187                 if (ra_list->is_11n_enabled) {
 188                         ra_list->pkt_count = 0;
 189                         ra_list->ba_packet_thr =
 190                                               mwifiex_get_random_ba_threshold();
 191                 }
 192                 list_add_tail(&ra_list->list,
 193                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 194
 195                 if (!priv->wmm.tid_tbl_ptr[i].ra_list_curr)
 196                         priv->wmm.tid_tbl_ptr[i].ra_list_curr = ra_list;
 197         }
 198 }
 199
 200 /*
 201  * This function sets the WMM queue priorities to their default values.
 202  */
 203 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 204 {
 205         /* Default queue priorities: VO->VI->BE->BK */
 206         priv->wmm.queue_priority[0] = WMM_AC_VO;
 207         priv->wmm.queue_priority[1] = WMM_AC_VI;
 208         priv->wmm.queue_priority[2] = WMM_AC_BE;
 209         priv->wmm.queue_priority[3] = WMM_AC_BK;
 210 }
 211
 212 /*
 213  * This function map ACs to TIDs.
 214  */
 215 static void
 216 mwifiex_wmm_queue_priorities_tid(struct mwifiex_wmm_desc *wmm)
 217 {
 218         u8 *queue_priority = wmm->queue_priority;
 219         int i;
 220
 221         for (i = 0; i < 4; ++i) {
 222                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 223                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 224         }
 225
 226         for (i = 0; i < MAX_NUM_TID; ++i)
 227                 tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 228
 229         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 230 }
 231
 232 /*
 233  * This function initializes WMM priority queues.
 234  */
 235 void
 236 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 237                                    struct ieee_types_wmm_parameter *wmm_ie)
 238 {
 239         u16 cw_min, avg_back_off, tmp[4];
 240         u32 i, j, num_ac;
 241         u8 ac_idx;
 242
 243         if (!wmm_ie || !priv->wmm_enabled) {
 244                 /* WMM is not enabled, just set the defaults and return */
 245                 mwifiex_wmm_default_queue_priorities(priv);
 246                 return;
 247         }
 248
 249         dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
 250                 "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 251                 wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 252                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 253                 wmm_ie->reserved);
 254
 255         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 256                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 257                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 258                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 259                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 260
 261                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 262                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 263                 tmp[ac_idx] = avg_back_off;
 264
 265                 dev_dbg(priv->adapter->dev,
 266                         "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 267                         (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 268                         cw_min, avg_back_off);
 269                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 270         }
 271
 272         /* Bubble sort */
 273         for (i = 0; i < num_ac; i++) {
 274                 for (j = 1; j < num_ac - i; j++) {
 275                         if (tmp[j - 1] > tmp[j]) {
 276                                 swap(tmp[j - 1], tmp[j]);
 277                                 swap(priv->wmm.queue_priority[j - 1],
 278                                      priv->wmm.queue_priority[j]);
 279                         } else if (tmp[j - 1] == tmp[j]) {
 280                                 if (priv->wmm.queue_priority[j - 1]
 281                                     < priv->wmm.queue_priority[j])
 282                                         swap(priv->wmm.queue_priority[j - 1],
 283                                              priv->wmm.queue_priority[j]);
 284                         }
 285                 }
 286         }
 287
 288         mwifiex_wmm_queue_priorities_tid(&priv->wmm);
 289 }
 290
 291 /*
 292  * This function evaluates whether or not an AC is to be downgraded.
 293  *
 294  * In case the AC is not enabled, the highest AC is returned that is
 295  * enabled and does not require admission control.
 296  */
 297 static enum mwifiex_wmm_ac_e
 298 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 299                               enum mwifiex_wmm_ac_e eval_ac)
 300 {
 301         int down_ac;
 302         enum mwifiex_wmm_ac_e ret_ac;
 303         struct mwifiex_wmm_ac_status *ac_status;
 304
 305         ac_status = &priv->wmm.ac_status[eval_ac];
 306
 307         if (!ac_status->disabled)
 308                 /* Okay to use this AC, its enabled */
 309                 return eval_ac;
 310
 311         /* Setup a default return value of the lowest priority */
 312         ret_ac = WMM_AC_BK;
 313
 314         /*
 315          *  Find the highest AC that is enabled and does not require
 316          *  admission control. The spec disallows downgrading to an AC,
 317          *  which is enabled due to a completed admission control.
 318          *  Unadmitted traffic is not to be sent on an AC with admitted
 319          *  traffic.
 320          */
 321         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 322                 ac_status = &priv->wmm.ac_status[down_ac];
 323
 324                 if (!ac_status->disabled && !ac_status->flow_required)
 325                         /* AC is enabled and does not require admission
 326                            control */
 327                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 328         }
 329
 330         return ret_ac;
 331 }
 332
 333 /*
 334  * This function downgrades WMM priority queue.
 335  */
 336 void
 337 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 338 {
 339         int ac_val;
 340
 341         dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
 342                         "BK(0), BE(1), VI(2), VO(3)\n");
 343
 344         if (!priv->wmm_enabled) {
 345                 /* WMM is not enabled, default priorities */
 346                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 347                         priv->wmm.ac_down_graded_vals[ac_val] =
 348                                                 (enum mwifiex_wmm_ac_e) ac_val;
 349         } else {
 350                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 351                         priv->wmm.ac_down_graded_vals[ac_val]
 352                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 353                                                 (enum mwifiex_wmm_ac_e) ac_val);
 354                         dev_dbg(priv->adapter->dev,
 355                                 "info: WMM: AC PRIO %d maps to %d\n",
 356                                 ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
 357                 }
 358         }
 359 }
 360
 361 /*
 362  * This function converts the IP TOS field to an WMM AC
 363  * Queue assignment.
 364  */
 365 static enum mwifiex_wmm_ac_e
 366 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 367 {
 368         /* Map of TOS UP values to WMM AC */
 369         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 370                 WMM_AC_BK,
 371                 WMM_AC_BK,
 372                 WMM_AC_BE,
 373                 WMM_AC_VI,
 374                 WMM_AC_VI,
 375                 WMM_AC_VO,
 376                 WMM_AC_VO
 377         };
 378
 379         if (tos >= ARRAY_SIZE(tos_to_ac))
 380                 return WMM_AC_BE;
 381
 382         return tos_to_ac[tos];
 383 }
 384
 385 /*
 386  * This function evaluates a given TID and downgrades it to a lower
 387  * TID if the WMM Parameter IE received from the AP indicates that the
 388  * AP is disabled (due to call admission control (ACM bit). Mapping
 389  * of TID to AC is taken care of internally.
 390  */
 391 static u8
 392 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 393 {
 394         enum mwifiex_wmm_ac_e ac, ac_down;
 395         u8 new_tid;
 396
 397         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 398         ac_down = priv->wmm.ac_down_graded_vals[ac];
 399
 400         /* Send the index to tid array, picking from the array will be
 401          * taken care by dequeuing function
 402          */
 403         new_tid = ac_to_tid[ac_down][tid % 2];
 404
 405         return new_tid;
 406 }
 407
 408 /*
 409  * This function initializes the WMM state information and the
 410  * WMM data path queues.
 411  */
 412 void
 413 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 414 {
 415         int i, j;
 416         struct mwifiex_private *priv;
 417
 418         for (j = 0; j < adapter->priv_num; ++j) {
 419                 priv = adapter->priv[j];
 420                 if (!priv)
 421                         continue;
 422
 423                 for (i = 0; i < MAX_NUM_TID; ++i) {
 424                         priv->aggr_prio_tbl[i].amsdu = tos_to_tid_inv[i];
 425                         priv->aggr_prio_tbl[i].ampdu_ap = tos_to_tid_inv[i];
 426                         priv->aggr_prio_tbl[i].ampdu_user = tos_to_tid_inv[i];
 427                         priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
 428                 }
 429
 430                 priv->aggr_prio_tbl[6].amsdu
 431                                         = priv->aggr_prio_tbl[6].ampdu_ap
 432                                         = priv->aggr_prio_tbl[6].ampdu_user
 433                                         = BA_STREAM_NOT_ALLOWED;
 434
 435                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 436                                         = priv->aggr_prio_tbl[7].ampdu_user
 437                                         = BA_STREAM_NOT_ALLOWED;
 438
 439                 mwifiex_set_ba_params(priv);
 440                 mwifiex_reset_11n_rx_seq_num(priv);
 441
 442                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 443                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 444         }
 445 }
 446
 447 /*
 448  * This function checks if WMM Tx queue is empty.
 449  */
 450 int
 451 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 452 {
 453         int i;
 454         struct mwifiex_private *priv;
 455
 456         for (i = 0; i < adapter->priv_num; ++i) {
 457                 priv = adapter->priv[i];
 458                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 459                         return false;
 460         }
 461
 462         return true;
 463 }
 464
 465 /*
 466  * This function deletes all packets in an RA list node.
 467  *
 468  * The packet sent completion callback handler are called with
 469  * status failure, after they are dequeued to ensure proper
 470  * cleanup. The RA list node itself is freed at the end.
 471  */
 472 static void
 473 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 474                                     struct mwifiex_ra_list_tbl *ra_list)
 475 {
 476         struct mwifiex_adapter *adapter = priv->adapter;
 477         struct sk_buff *skb, *tmp;
 478
 479         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 480                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 481 }
 482
 483 /*
 484  * This function deletes all packets in an RA list.
 485  *
 486  * Each nodes in the RA list are freed individually first, and then
 487  * the RA list itself is freed.
 488  */
 489 static void
 490 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 491                                struct list_head *ra_list_head)
 492 {
 493         struct mwifiex_ra_list_tbl *ra_list;
 494
 495         list_for_each_entry(ra_list, ra_list_head, list)
 496                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 497 }
 498
 499 /*
 500  * This function deletes all packets in all RA lists.
 501  */
 502 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 503 {
 504         int i;
 505
 506         for (i = 0; i < MAX_NUM_TID; i++)
 507                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 508                                                                        ra_list);
 509
 510         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 511         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 512 }
 513
 514 /*
 515  * This function deletes all route addresses from all RA lists.
 516  */
 517 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 518 {
 519         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 520         int i;
 521
 522         for (i = 0; i < MAX_NUM_TID; ++i) {
 523                 dev_dbg(priv->adapter->dev,
 524                         "info: ra_list: freeing buf for tid %d\n", i);
 525                 list_for_each_entry_safe(ra_list, tmp_node,
 526                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 527                                          list) {
 528                         list_del(&ra_list->list);
 529                         kfree(ra_list);
 530                 }
 531
 532                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 533
 534                 priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
 535         }
 536 }
 537
 538 /*
 539  * This function cleans up the Tx and Rx queues.
 540  *
 541  * Cleanup includes -
 542  *      - All packets in RA lists
 543  *      - All entries in Rx reorder table
 544  *      - All entries in Tx BA stream table
 545  *      - MPA buffer (if required)
 546  *      - All RA lists
 547  */
 548 void
 549 mwifiex_clean_txrx(struct mwifiex_private *priv)
 550 {
 551         unsigned long flags;
 552
 553         mwifiex_11n_cleanup_reorder_tbl(priv);
 554         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 555
 556         mwifiex_wmm_cleanup_queues(priv);
 557         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 558
 559         if (priv->adapter->if_ops.cleanup_mpa_buf)
 560                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 561
 562         mwifiex_wmm_delete_all_ralist(priv);
 563         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 564
 565         if (priv->adapter->if_ops.clean_pcie_ring)
 566                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 567         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 568 }
 569
 570 /*
 571  * This function retrieves a particular RA list node, matching with the
 572  * given TID and RA address.
 573  */
 574 static struct mwifiex_ra_list_tbl *
 575 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 576                             u8 *ra_addr)
 577 {
 578         struct mwifiex_ra_list_tbl *ra_list;
 579
 580         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 581                             list) {
 582                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 583                         return ra_list;
 584         }
 585
 586         return NULL;
 587 }
 588
 589 /*
 590  * This function retrieves an RA list node for a given TID and
 591  * RA address pair.
 592  *
 593  * If no such node is found, a new node is added first and then
 594  * retrieved.
 595  */
 596 static struct mwifiex_ra_list_tbl *
 597 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, u8 *ra_addr)
 598 {
 599         struct mwifiex_ra_list_tbl *ra_list;
 600
 601         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 602         if (ra_list)
 603                 return ra_list;
 604         mwifiex_ralist_add(priv, ra_addr);
 605
 606         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 607 }
 608
 609 /*
 610  * This function checks if a particular RA list node exists in a given TID
 611  * table index.
 612  */
 613 int
 614 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 615                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 616 {
 617         struct mwifiex_ra_list_tbl *rlist;
 618
 619         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 620                             list) {
 621                 if (rlist == ra_list)
 622                         return true;
 623         }
 624
 625         return false;
 626 }
 627
 628 /*
 629  * This function adds a packet to WMM queue.
 630  *
 631  * In disconnected state the packet is immediately dropped and the
 632  * packet send completion callback is called with status failure.
 633  *
 634  * Otherwise, the correct RA list node is located and the packet
 635  * is queued at the list tail.
 636  */
 637 void
 638 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 639                             struct sk_buff *skb)
 640 {
 641         struct mwifiex_adapter *adapter = priv->adapter;
 642         u32 tid;
 643         struct mwifiex_ra_list_tbl *ra_list;
 644         u8 ra[ETH_ALEN], tid_down;
 645         unsigned long flags;
 646
 647         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 648                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 649                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 650                 return;
 651         }
 652
 653         tid = skb->priority;
 654
 655         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 656
 657         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 658
 659         /* In case of infra as we have already created the list during
 660            association we just don't have to call get_queue_raptr, we will
 661            have only 1 raptr for a tid in case of infra */
 662         if (!mwifiex_queuing_ra_based(priv) &&
 663             !mwifiex_is_skb_mgmt_frame(skb)) {
 664                 if (!list_empty(&priv->wmm.tid_tbl_ptr[tid_down].ra_list))
 665                         ra_list = list_first_entry(
 666                                 &priv->wmm.tid_tbl_ptr[tid_down].ra_list,
 667                                 struct mwifiex_ra_list_tbl, list);
 668                 else
 669                         ra_list = NULL;
 670         } else {
 671                 memcpy(ra, skb->data, ETH_ALEN);
 672                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 673                         memset(ra, 0xff, ETH_ALEN);
 674                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 675         }
 676
 677         if (!ra_list) {
 678                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 679                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 680                 return;
 681         }
 682
 683         skb_queue_tail(&ra_list->skb_head, skb);
 684
 685         ra_list->total_pkts_size += skb->len;
 686         ra_list->pkt_count++;
 687
 688         if (atomic_read(&priv->wmm.highest_queued_prio) <
 689                                                 tos_to_tid_inv[tid_down])
 690                 atomic_set(&priv->wmm.highest_queued_prio,
 691                            tos_to_tid_inv[tid_down]);
 692
 693         atomic_inc(&priv->wmm.tx_pkts_queued);
 694
 695         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 696 }
 697
 698 /*
 699  * This function processes the get WMM status command response from firmware.
 700  *
 701  * The response may contain multiple TLVs -
 702  *      - AC Queue status TLVs
 703  *      - Current WMM Parameter IE TLV
 704  *      - Admission Control action frame TLVs
 705  *
 706  * This function parses the TLVs and then calls further specific functions
 707  * to process any changes in the queue prioritize or state.
 708  */
 709 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 710                                const struct host_cmd_ds_command *resp)
 711 {
 712         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 713         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 714         int valid = true;
 715
 716         struct mwifiex_ie_types_data *tlv_hdr;
 717         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 718         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 719         struct mwifiex_wmm_ac_status *ac_status;
 720
 721         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 722                 resp_len);
 723
 724         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 725                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 726                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 727
 728                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 729                 case TLV_TYPE_WMMQSTATUS:
 730                         tlv_wmm_qstatus =
 731                                 (struct mwifiex_ie_types_wmm_queue_status *)
 732                                 tlv_hdr;
 733                         dev_dbg(priv->adapter->dev,
 734                                 "info: CMD_RESP: WMM_GET_STATUS:"
 735                                 " QSTATUS TLV: %d, %d, %d\n",
 736                                 tlv_wmm_qstatus->queue_index,
 737                                 tlv_wmm_qstatus->flow_required,
 738                                 tlv_wmm_qstatus->disabled);
 739
 740                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 741                                                          queue_index];
 742                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 743                         ac_status->flow_required =
 744                                                 tlv_wmm_qstatus->flow_required;
 745                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 746                         break;
 747
 748                 case WLAN_EID_VENDOR_SPECIFIC:
 749                         /*
 750                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 751                          *   and setup the IEEE IE type and length byte fields
 752                          */
 753
 754                         wmm_param_ie =
 755                                 (struct ieee_types_wmm_parameter *) (curr +
 756                                                                     2);
 757                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 758                         wmm_param_ie->vend_hdr.element_id =
 759                                                 WLAN_EID_VENDOR_SPECIFIC;
 760
 761                         dev_dbg(priv->adapter->dev,
 762                                 "info: CMD_RESP: WMM_GET_STATUS:"
 763                                 " WMM Parameter Set Count: %d\n",
 764                                 wmm_param_ie->qos_info_bitmap &
 765                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 766
 767                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 768                                wmm_ie, wmm_param_ie,
 769                                wmm_param_ie->vend_hdr.len + 2);
 770
 771                         break;
 772
 773                 default:
 774                         valid = false;
 775                         break;
 776                 }
 777
 778                 curr += (tlv_len + sizeof(tlv_hdr->header));
 779                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 780         }
 781
 782         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 783         mwifiex_wmm_setup_ac_downgrade(priv);
 784
 785         return 0;
 786 }
 787
 788 /*
 789  * Callback handler from the command module to allow insertion of a WMM TLV.
 790  *
 791  * If the BSS we are associating to supports WMM, this function adds the
 792  * required WMM Information IE to the association request command buffer in
 793  * the form of a Marvell extended IEEE IE.
 794  */
 795 u32
 796 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 797                                     u8 **assoc_buf,
 798                                     struct ieee_types_wmm_parameter *wmm_ie,
 799                                     struct ieee80211_ht_cap *ht_cap)
 800 {
 801         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 802         u32 ret_len = 0;
 803
 804         /* Null checks */
 805         if (!assoc_buf)
 806                 return 0;
 807         if (!(*assoc_buf))
 808                 return 0;
 809
 810         if (!wmm_ie)
 811                 return 0;
 812
 813         dev_dbg(priv->adapter->dev,
 814                 "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 815                 wmm_ie->vend_hdr.element_id);
 816
 817         if ((priv->wmm_required ||
 818              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 819              priv->adapter->config_bands & BAND_AN))) &&
 820             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 821                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 822                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 823                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 824                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 825                        le16_to_cpu(wmm_tlv->header.len));
 826                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 827                         memcpy((u8 *) (wmm_tlv->wmm_ie
 828                                        + le16_to_cpu(wmm_tlv->header.len)
 829                                        - sizeof(priv->wmm_qosinfo)),
 830                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 831
 832                 ret_len = sizeof(wmm_tlv->header)
 833                           + le16_to_cpu(wmm_tlv->header.len);
 834
 835                 *assoc_buf += ret_len;
 836         }
 837
 838         return ret_len;
 839 }
 840
 841 /*
 842  * This function computes the time delay in the driver queues for a
 843  * given packet.
 844  *
 845  * When the packet is received at the OS/Driver interface, the current
 846  * time is set in the packet structure. The difference between the present
 847  * time and that received time is computed in this function and limited
 848  * based on pre-compiled limits in the driver.
 849  */
 850 u8
 851 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 852                                   const struct sk_buff *skb)
 853 {
 854         u8 ret_val;
 855         struct timeval out_tstamp, in_tstamp;
 856         u32 queue_delay;
 857
 858         do_gettimeofday(&out_tstamp);
 859         in_tstamp = ktime_to_timeval(skb->tstamp);
 860
 861         queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
 862         queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;
 863
 864         /*
 865          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 866          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 867          *
 868          * Pass max value if queue_delay is beyond the uint8 range
 869          */
 870         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 871
 872         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 873                                 " %d ms sent to FW\n", queue_delay, ret_val);
 874
 875         return ret_val;
 876 }
 877
 878 /*
 879  * This function retrieves the highest priority RA list table pointer.
 880  */
 881 static struct mwifiex_ra_list_tbl *
 882 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 883                                      struct mwifiex_private **priv, int *tid)
 884 {
 885         struct mwifiex_private *priv_tmp;
 886         struct mwifiex_ra_list_tbl *ptr, *head;
 887         struct mwifiex_bss_prio_node *bssprio_node, *bssprio_head;
 888         struct mwifiex_tid_tbl *tid_ptr;
 889         atomic_t *hqp;
 890         unsigned long flags_bss, flags_ra;
 891         int i, j;
 892
 893         for (j = adapter->priv_num - 1; j >= 0; --j) {
 894                 spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 895                                   flags_bss);
 896
 897                 if (list_empty(&adapter->bss_prio_tbl[j].bss_prio_head))
 898                         goto skip_prio_tbl;
 899
 900                 if (adapter->bss_prio_tbl[j].bss_prio_cur ==
 901                     (struct mwifiex_bss_prio_node *)
 902                     &adapter->bss_prio_tbl[j].bss_prio_head) {
 903                         adapter->bss_prio_tbl[j].bss_prio_cur =
 904                                 list_first_entry(&adapter->bss_prio_tbl[j]
 905                                                  .bss_prio_head,
 906                                                  struct mwifiex_bss_prio_node,
 907                                                  list);
 908                 }
 909
 910                 bssprio_node = adapter->bss_prio_tbl[j].bss_prio_cur;
 911                 bssprio_head = bssprio_node;
 912
 913                 do {
 914                         priv_tmp = bssprio_node->priv;
 915
 916                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 917                                 goto skip_bss;
 918
 919                         /* iterate over the WMM queues of the BSS */
 920                         hqp = &priv_tmp->wmm.highest_queued_prio;
 921                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 922
 923                                 spin_lock_irqsave(&priv_tmp->wmm.
 924                                                   ra_list_spinlock, flags_ra);
 925
 926                                 tid_ptr = &(priv_tmp)->wmm.
 927                                         tid_tbl_ptr[tos_to_tid[i]];
 928
 929                                 /* For non-STA ra_list_curr may be NULL */
 930                                 if (!tid_ptr->ra_list_curr)
 931                                         goto skip_wmm_queue;
 932
 933                                 if (list_empty(&tid_ptr->ra_list))
 934                                         goto skip_wmm_queue;
 935
 936                                 /*
 937                                  * Always choose the next ra we transmitted
 938                                  * last time, this way we pick the ra's in
 939                                  * round robin fashion.
 940                                  */
 941                                 ptr = list_first_entry(
 942                                                 &tid_ptr->ra_list_curr->list,
 943                                                 struct mwifiex_ra_list_tbl,
 944                                                 list);
 945
 946                                 head = ptr;
 947                                 if (ptr == (struct mwifiex_ra_list_tbl *)
 948                                                 &tid_ptr->ra_list) {
 949                                         /* Get next ra */
 950                                         ptr = list_first_entry(&ptr->list,
 951                                             struct mwifiex_ra_list_tbl, list);
 952                                         head = ptr;
 953                                 }
 954
 955                                 do {
 956                                         if (!skb_queue_empty(&ptr->skb_head))
 957                                                 /* holds both locks */
 958                                                 goto found;
 959
 960                                         /* Get next ra */
 961                                         ptr = list_first_entry(&ptr->list,
 962                                                  struct mwifiex_ra_list_tbl,
 963                                                  list);
 964                                         if (ptr ==
 965                                             (struct mwifiex_ra_list_tbl *)
 966                                             &tid_ptr->ra_list)
 967                                                 ptr = list_first_entry(
 968                                                     &ptr->list,
 969                                                     struct mwifiex_ra_list_tbl,
 970                                                     list);
 971                                 } while (ptr != head);
 972
 973 skip_wmm_queue:
 974                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 975                                                        ra_list_spinlock,
 976                                                        flags_ra);
 977                         }
 978
 979 skip_bss:
 980                         /* Get next bss priority node */
 981                         bssprio_node = list_first_entry(&bssprio_node->list,
 982                                                 struct mwifiex_bss_prio_node,
 983                                                 list);
 984
 985                         if (bssprio_node ==
 986                             (struct mwifiex_bss_prio_node *)
 987                             &adapter->bss_prio_tbl[j].bss_prio_head)
 988                                 /* Get next bss priority node */
 989                                 bssprio_node = list_first_entry(
 990                                                 &bssprio_node->list,
 991                                                 struct mwifiex_bss_prio_node,
 992                                                 list);
 993                 } while (bssprio_node != bssprio_head);
 994
 995 skip_prio_tbl:
 996                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 997                                        flags_bss);
 998         }
 999
1000         return NULL;
1001
1002 found:
1003         /* holds bss_prio_lock / ra_list_spinlock */
1004         if (atomic_read(hqp) > i)
1005                 atomic_set(hqp, i);
1006         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1007         spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
1008                                flags_bss);
1009
1010         *priv = priv_tmp;
1011         *tid = tos_to_tid[i];
1012
1013         return ptr;
1014 }
1015
1016 /*
1017  * This function checks if 11n aggregation is possible.
1018  */
1019 static int
1020 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1021                                     struct mwifiex_ra_list_tbl *ptr,
1022                                     int max_buf_size)
1023 {
1024         int count = 0, total_size = 0;
1025         struct sk_buff *skb, *tmp;
1026         int max_amsdu_size;
1027
1028         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1029             ptr->is_11n_enabled)
1030                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1031         else
1032                 max_amsdu_size = max_buf_size;
1033
1034         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1035                 total_size += skb->len;
1036                 if (total_size >= max_amsdu_size)
1037                         break;
1038                 if (++count >= MIN_NUM_AMSDU)
1039                         return true;
1040         }
1041
1042         return false;
1043 }
1044
1045 /*
1046  * This function sends a single packet to firmware for transmission.
1047  */
1048 static void
1049 mwifiex_send_single_packet(struct mwifiex_private *priv,
1050                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1051                            unsigned long ra_list_flags)
1052                            __releases(&priv->wmm.ra_list_spinlock)
1053 {
1054         struct sk_buff *skb, *skb_next;
1055         struct mwifiex_tx_param tx_param;
1056         struct mwifiex_adapter *adapter = priv->adapter;
1057         struct mwifiex_txinfo *tx_info;
1058
1059         if (skb_queue_empty(&ptr->skb_head)) {
1060                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1061                                        ra_list_flags);
1062                 dev_dbg(adapter->dev, "data: nothing to send\n");
1063                 return;
1064         }
1065
1066         skb = skb_dequeue(&ptr->skb_head);
1067
1068         tx_info = MWIFIEX_SKB_TXCB(skb);
1069         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1070
1071         ptr->total_pkts_size -= skb->len;
1072
1073         if (!skb_queue_empty(&ptr->skb_head))
1074                 skb_next = skb_peek(&ptr->skb_head);
1075         else
1076                 skb_next = NULL;
1077
1078         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1079
1080         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1081                                 sizeof(struct txpd) : 0);
1082
1083         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1084                 /* Queue the packet back at the head */
1085                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1086
1087                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1088                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1089                                                ra_list_flags);
1090                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1091                         return;
1092                 }
1093
1094                 skb_queue_tail(&ptr->skb_head, skb);
1095
1096                 ptr->total_pkts_size += skb->len;
1097                 ptr->pkt_count++;
1098                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1099                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1100                                        ra_list_flags);
1101         } else {
1102                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1103                 if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1104                         priv->wmm.packets_out[ptr_index]++;
1105                         priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
1106                 }
1107                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
1108                         list_first_entry(
1109                                 &adapter->bss_prio_tbl[priv->bss_priority]
1110                                 .bss_prio_cur->list,
1111                                 struct mwifiex_bss_prio_node,
1112                                 list);
1113                 atomic_dec(&priv->wmm.tx_pkts_queued);
1114                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1115                                        ra_list_flags);
1116         }
1117 }
1118
1119 /*
1120  * This function checks if the first packet in the given RA list
1121  * is already processed or not.
1122  */
1123 static int
1124 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1125                          struct mwifiex_ra_list_tbl *ptr)
1126 {
1127         struct sk_buff *skb;
1128         struct mwifiex_txinfo *tx_info;
1129
1130         if (skb_queue_empty(&ptr->skb_head))
1131                 return false;
1132
1133         skb = skb_peek(&ptr->skb_head);
1134
1135         tx_info = MWIFIEX_SKB_TXCB(skb);
1136         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1137                 return true;
1138
1139         return false;
1140 }
1141
1142 /*
1143  * This function sends a single processed packet to firmware for
1144  * transmission.
1145  */
1146 static void
1147 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1148                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1149                               unsigned long ra_list_flags)
1150                                 __releases(&priv->wmm.ra_list_spinlock)
1151 {
1152         struct mwifiex_tx_param tx_param;
1153         struct mwifiex_adapter *adapter = priv->adapter;
1154         int ret = -1;
1155         struct sk_buff *skb, *skb_next;
1156         struct mwifiex_txinfo *tx_info;
1157
1158         if (skb_queue_empty(&ptr->skb_head)) {
1159                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1160                                        ra_list_flags);
1161                 return;
1162         }
1163
1164         skb = skb_dequeue(&ptr->skb_head);
1165
1166         if (!skb_queue_empty(&ptr->skb_head))
1167                 skb_next = skb_peek(&ptr->skb_head);
1168         else
1169                 skb_next = NULL;
1170
1171         tx_info = MWIFIEX_SKB_TXCB(skb);
1172
1173         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1174
1175         if (adapter->iface_type == MWIFIEX_USB) {
1176                 adapter->data_sent = true;
1177                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1178                                                    skb, NULL);
1179         } else {
1180                 tx_param.next_pkt_len =
1181                         ((skb_next) ? skb_next->len +
1182                          sizeof(struct txpd) : 0);
1183                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1184                                                    skb, &tx_param);
1185         }
1186
1187         switch (ret) {
1188         case -EBUSY:
1189                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1190                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1191
1192                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1193                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1194                                                ra_list_flags);
1195                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1196                         return;
1197                 }
1198
1199                 skb_queue_tail(&ptr->skb_head, skb);
1200
1201                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1202                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1203                                        ra_list_flags);
1204                 break;
1205         case -1:
1206                 if (adapter->iface_type != MWIFIEX_PCIE)
1207                         adapter->data_sent = false;
1208                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1209                 adapter->dbg.num_tx_host_to_card_failure++;
1210                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1211                 break;
1212         case -EINPROGRESS:
1213                 if (adapter->iface_type != MWIFIEX_PCIE)
1214                         adapter->data_sent = false;
1215         default:
1216                 break;
1217         }
1218         if (ret != -EBUSY) {
1219                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1220                 if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1221                         priv->wmm.packets_out[ptr_index]++;
1222                         priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
1223                 }
1224                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
1225                         list_first_entry(
1226                                 &adapter->bss_prio_tbl[priv->bss_priority]
1227                                 .bss_prio_cur->list,
1228                                 struct mwifiex_bss_prio_node,
1229                                 list);
1230                 atomic_dec(&priv->wmm.tx_pkts_queued);
1231                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1232                                        ra_list_flags);
1233         }
1234 }
1235
1236 /*
1237  * This function dequeues a packet from the highest priority list
1238  * and transmits it.
1239  */
1240 static int
1241 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1242 {
1243         struct mwifiex_ra_list_tbl *ptr;
1244         struct mwifiex_private *priv = NULL;
1245         int ptr_index = 0;
1246         u8 ra[ETH_ALEN];
1247         int tid_del = 0, tid = 0;
1248         unsigned long flags;
1249
1250         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1251         if (!ptr)
1252                 return -1;
1253
1254         tid = mwifiex_get_tid(ptr);
1255
1256         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1257
1258         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1259         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1260                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1261                 return -1;
1262         }
1263
1264         if (mwifiex_is_ptr_processed(priv, ptr)) {
1265                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1266                 /* ra_list_spinlock has been freed in
1267                    mwifiex_send_processed_packet() */
1268                 return 0;
1269         }
1270
1271         if (!ptr->is_11n_enabled ||
1272             mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1273             priv->wps.session_enable ||
1274             ((priv->sec_info.wpa_enabled ||
1275               priv->sec_info.wpa2_enabled) &&
1276              !priv->wpa_is_gtk_set)) {
1277                 mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1278                 /* ra_list_spinlock has been freed in
1279                    mwifiex_send_single_packet() */
1280         } else {
1281                 if (mwifiex_is_ampdu_allowed(priv, tid) &&
1282                     ptr->pkt_count > ptr->ba_packet_thr) {
1283                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1284                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1285                                                       BA_SETUP_INPROGRESS);
1286                                 mwifiex_send_addba(priv, tid, ptr->ra);
1287                         } else if (mwifiex_find_stream_to_delete
1288                                    (priv, tid, &tid_del, ra)) {
1289                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1290                                                       BA_SETUP_INPROGRESS);
1291                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1292                         }
1293                 }
1294                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1295                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1296                                                         adapter->tx_buf_size))
1297                         mwifiex_11n_aggregate_pkt(priv, ptr, INTF_HEADER_LEN,
1298                                                   ptr_index, flags);
1299                         /* ra_list_spinlock has been freed in
1300                            mwifiex_11n_aggregate_pkt() */
1301                 else
1302                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1303                         /* ra_list_spinlock has been freed in
1304                            mwifiex_send_single_packet() */
1305         }
1306         return 0;
1307 }
1308
1309 /*
1310  * This function transmits the highest priority packet awaiting in the
1311  * WMM Queues.
1312  */
1313 void
1314 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1315 {
1316         do {
1317                 /* Check if busy */
1318                 if (adapter->data_sent || adapter->tx_lock_flag)
1319                         break;
1320
1321                 if (mwifiex_dequeue_tx_packet(adapter))
1322                         break;
1323         } while (!mwifiex_wmm_lists_empty(adapter));
1324 }