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