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 static bool enable_tx_amsdu;
  41 module_param(enable_tx_amsdu, bool, 0644);
  42
  43 /* WMM information IE */
  44 static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
  45         0x00, 0x50, 0xf2, 0x02,
  46         0x00, 0x01, 0x00
  47 };
  48
  49 static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
  50         WMM_AC_BK,
  51         WMM_AC_VI,
  52         WMM_AC_VO
  53 };
  54
  55 static u8 tos_to_tid[] = {
  56         /* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
  57         0x01,                   /* 0 1 0 AC_BK */
  58         0x02,                   /* 0 0 0 AC_BK */
  59         0x00,                   /* 0 0 1 AC_BE */
  60         0x03,                   /* 0 1 1 AC_BE */
  61         0x04,                   /* 1 0 0 AC_VI */
  62         0x05,                   /* 1 0 1 AC_VI */
  63         0x06,                   /* 1 1 0 AC_VO */
  64         0x07                    /* 1 1 1 AC_VO */
  65 };
  66
  67 /*
  68  * This table inverses the tos_to_tid operation to get a priority
  69  * which is in sequential order, and can be compared.
  70  * Use this to compare the priority of two different TIDs.
  71  */
  72 static u8 tos_to_tid_inv[] = {
  73         0x02,  /* from tos_to_tid[2] = 0 */
  74         0x00,  /* from tos_to_tid[0] = 1 */
  75         0x01,  /* from tos_to_tid[1] = 2 */
  76         0x03,
  77         0x04,
  78         0x05,
  79         0x06,
  80         0x07};
  81
  82 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
  83
  84 /*
  85  * This function debug prints the priority parameters for a WMM AC.
  86  */
  87 static void
  88 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
  89 {
  90         const char *ac_str[] = { "BK", "BE", "VI", "VO" };
  91
  92         pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
  93                  "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
  94                  ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
  95                                              & MWIFIEX_ACI) >> 5]],
  96                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
  97                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
  98                  ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
  99                  ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
 100                  (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
 101                  le16_to_cpu(ac_param->tx_op_limit));
 102 }
 103
 104 /*
 105  * This function allocates a route address list.
 106  *
 107  * The function also initializes the list with the provided RA.
 108  */
 109 static struct mwifiex_ra_list_tbl *
 110 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
 111 {
 112         struct mwifiex_ra_list_tbl *ra_list;
 113
 114         ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
 115         if (!ra_list)
 116                 return NULL;
 117
 118         INIT_LIST_HEAD(&ra_list->list);
 119         skb_queue_head_init(&ra_list->skb_head);
 120
 121         memcpy(ra_list->ra, ra, ETH_ALEN);
 122
 123         ra_list->total_pkt_count = 0;
 124
 125         dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 126
 127         return ra_list;
 128 }
 129
 130 /* This function returns random no between 16 and 32 to be used as threshold
 131  * for no of packets after which BA setup is initiated.
 132  */
 133 static u8 mwifiex_get_random_ba_threshold(void)
 134 {
 135         u32 sec, usec;
 136         struct timeval ba_tstamp;
 137         u8 ba_threshold;
 138
 139         /* setup ba_packet_threshold here random number between
 140          * [BA_SETUP_PACKET_OFFSET,
 141          * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
 142          */
 143
 144         do_gettimeofday(&ba_tstamp);
 145         sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
 146         usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
 147         ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
 148                                                       + BA_SETUP_PACKET_OFFSET;
 149
 150         return ba_threshold;
 151 }
 152
 153 /*
 154  * This function allocates and adds a RA list for all TIDs
 155  * with the given RA.
 156  */
 157 void
 158 mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 159 {
 160         int i;
 161         struct mwifiex_ra_list_tbl *ra_list;
 162         struct mwifiex_adapter *adapter = priv->adapter;
 163         struct mwifiex_sta_node *node;
 164         unsigned long flags;
 165
 166         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 167         node = mwifiex_get_sta_entry(priv, ra);
 168         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 169
 170         for (i = 0; i < MAX_NUM_TID; ++i) {
 171                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 172                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 173
 174                 if (!ra_list)
 175                         break;
 176
 177                 ra_list->is_11n_enabled = 0;
 178                 if (!mwifiex_queuing_ra_based(priv)) {
 179                         ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 180                 } else {
 181                         ra_list->is_11n_enabled =
 182                                       mwifiex_is_sta_11n_enabled(priv, node);
 183                         if (ra_list->is_11n_enabled)
 184                                 ra_list->max_amsdu = node->max_amsdu;
 185                 }
 186
 187                 dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 188                         ra_list, ra_list->is_11n_enabled);
 189
 190                 if (ra_list->is_11n_enabled) {
 191                         ra_list->ba_pkt_count = 0;
 192                         ra_list->ba_packet_thr =
 193                                               mwifiex_get_random_ba_threshold();
 194                 }
 195                 list_add_tail(&ra_list->list,
 196                               &priv->wmm.tid_tbl_ptr[i].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                 }
 428
 429                 priv->aggr_prio_tbl[6].amsdu
 430                                         = priv->aggr_prio_tbl[6].ampdu_ap
 431                                         = priv->aggr_prio_tbl[6].ampdu_user
 432                                         = BA_STREAM_NOT_ALLOWED;
 433
 434                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 435                                         = priv->aggr_prio_tbl[7].ampdu_user
 436                                         = BA_STREAM_NOT_ALLOWED;
 437
 438                 mwifiex_set_ba_params(priv);
 439                 mwifiex_reset_11n_rx_seq_num(priv);
 440
 441                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 442                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 443         }
 444 }
 445
 446 /*
 447  * This function checks if WMM Tx queue is empty.
 448  */
 449 int
 450 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 451 {
 452         int i;
 453         struct mwifiex_private *priv;
 454
 455         for (i = 0; i < adapter->priv_num; ++i) {
 456                 priv = adapter->priv[i];
 457                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 458                         return false;
 459         }
 460
 461         return true;
 462 }
 463
 464 /*
 465  * This function deletes all packets in an RA list node.
 466  *
 467  * The packet sent completion callback handler are called with
 468  * status failure, after they are dequeued to ensure proper
 469  * cleanup. The RA list node itself is freed at the end.
 470  */
 471 static void
 472 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 473                                     struct mwifiex_ra_list_tbl *ra_list)
 474 {
 475         struct mwifiex_adapter *adapter = priv->adapter;
 476         struct sk_buff *skb, *tmp;
 477
 478         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 479                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 480 }
 481
 482 /*
 483  * This function deletes all packets in an RA list.
 484  *
 485  * Each nodes in the RA list are freed individually first, and then
 486  * the RA list itself is freed.
 487  */
 488 static void
 489 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 490                                struct list_head *ra_list_head)
 491 {
 492         struct mwifiex_ra_list_tbl *ra_list;
 493
 494         list_for_each_entry(ra_list, ra_list_head, list)
 495                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 496 }
 497
 498 /*
 499  * This function deletes all packets in all RA lists.
 500  */
 501 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 502 {
 503         int i;
 504
 505         for (i = 0; i < MAX_NUM_TID; i++)
 506                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 507                                                                        ra_list);
 508
 509         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 510         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 511 }
 512
 513 /*
 514  * This function deletes all route addresses from all RA lists.
 515  */
 516 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 517 {
 518         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 519         int i;
 520
 521         for (i = 0; i < MAX_NUM_TID; ++i) {
 522                 dev_dbg(priv->adapter->dev,
 523                         "info: ra_list: freeing buf for tid %d\n", i);
 524                 list_for_each_entry_safe(ra_list, tmp_node,
 525                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 526                                          list) {
 527                         list_del(&ra_list->list);
 528                         kfree(ra_list);
 529                 }
 530
 531                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 532         }
 533 }
 534
 535 /*
 536  * This function cleans up the Tx and Rx queues.
 537  *
 538  * Cleanup includes -
 539  *      - All packets in RA lists
 540  *      - All entries in Rx reorder table
 541  *      - All entries in Tx BA stream table
 542  *      - MPA buffer (if required)
 543  *      - All RA lists
 544  */
 545 void
 546 mwifiex_clean_txrx(struct mwifiex_private *priv)
 547 {
 548         unsigned long flags;
 549
 550         mwifiex_11n_cleanup_reorder_tbl(priv);
 551         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 552
 553         mwifiex_wmm_cleanup_queues(priv);
 554         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 555
 556         if (priv->adapter->if_ops.cleanup_mpa_buf)
 557                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 558
 559         mwifiex_wmm_delete_all_ralist(priv);
 560         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 561
 562         if (priv->adapter->if_ops.clean_pcie_ring)
 563                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 564         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 565 }
 566
 567 /*
 568  * This function retrieves a particular RA list node, matching with the
 569  * given TID and RA address.
 570  */
 571 static struct mwifiex_ra_list_tbl *
 572 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 573                             u8 *ra_addr)
 574 {
 575         struct mwifiex_ra_list_tbl *ra_list;
 576
 577         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 578                             list) {
 579                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 580                         return ra_list;
 581         }
 582
 583         return NULL;
 584 }
 585
 586 /*
 587  * This function retrieves an RA list node for a given TID and
 588  * RA address pair.
 589  *
 590  * If no such node is found, a new node is added first and then
 591  * retrieved.
 592  */
 593 static struct mwifiex_ra_list_tbl *
 594 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, u8 *ra_addr)
 595 {
 596         struct mwifiex_ra_list_tbl *ra_list;
 597
 598         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 599         if (ra_list)
 600                 return ra_list;
 601         mwifiex_ralist_add(priv, ra_addr);
 602
 603         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 604 }
 605
 606 /*
 607  * This function checks if a particular RA list node exists in a given TID
 608  * table index.
 609  */
 610 int
 611 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 612                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 613 {
 614         struct mwifiex_ra_list_tbl *rlist;
 615
 616         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 617                             list) {
 618                 if (rlist == ra_list)
 619                         return true;
 620         }
 621
 622         return false;
 623 }
 624
 625 /*
 626  * This function adds a packet to WMM queue.
 627  *
 628  * In disconnected state the packet is immediately dropped and the
 629  * packet send completion callback is called with status failure.
 630  *
 631  * Otherwise, the correct RA list node is located and the packet
 632  * is queued at the list tail.
 633  */
 634 void
 635 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 636                             struct sk_buff *skb)
 637 {
 638         struct mwifiex_adapter *adapter = priv->adapter;
 639         u32 tid;
 640         struct mwifiex_ra_list_tbl *ra_list;
 641         u8 ra[ETH_ALEN], tid_down;
 642         unsigned long flags;
 643
 644         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 645                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 646                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 647                 return;
 648         }
 649
 650         tid = skb->priority;
 651
 652         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 653
 654         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 655
 656         /* In case of infra as we have already created the list during
 657            association we just don't have to call get_queue_raptr, we will
 658            have only 1 raptr for a tid in case of infra */
 659         if (!mwifiex_queuing_ra_based(priv) &&
 660             !mwifiex_is_skb_mgmt_frame(skb)) {
 661                 if (!list_empty(&priv->wmm.tid_tbl_ptr[tid_down].ra_list))
 662                         ra_list = list_first_entry(
 663                                 &priv->wmm.tid_tbl_ptr[tid_down].ra_list,
 664                                 struct mwifiex_ra_list_tbl, list);
 665                 else
 666                         ra_list = NULL;
 667         } else {
 668                 memcpy(ra, skb->data, ETH_ALEN);
 669                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 670                         memset(ra, 0xff, ETH_ALEN);
 671                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 672         }
 673
 674         if (!ra_list) {
 675                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 676                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 677                 return;
 678         }
 679
 680         skb_queue_tail(&ra_list->skb_head, skb);
 681
 682         ra_list->ba_pkt_count++;
 683         ra_list->total_pkt_count++;
 684
 685         if (atomic_read(&priv->wmm.highest_queued_prio) <
 686                                                 tos_to_tid_inv[tid_down])
 687                 atomic_set(&priv->wmm.highest_queued_prio,
 688                            tos_to_tid_inv[tid_down]);
 689
 690         atomic_inc(&priv->wmm.tx_pkts_queued);
 691
 692         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 693 }
 694
 695 /*
 696  * This function processes the get WMM status command response from firmware.
 697  *
 698  * The response may contain multiple TLVs -
 699  *      - AC Queue status TLVs
 700  *      - Current WMM Parameter IE TLV
 701  *      - Admission Control action frame TLVs
 702  *
 703  * This function parses the TLVs and then calls further specific functions
 704  * to process any changes in the queue prioritize or state.
 705  */
 706 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 707                                const struct host_cmd_ds_command *resp)
 708 {
 709         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 710         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 711         bool valid = true;
 712
 713         struct mwifiex_ie_types_data *tlv_hdr;
 714         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 715         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 716         struct mwifiex_wmm_ac_status *ac_status;
 717
 718         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 719                 resp_len);
 720
 721         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 722                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 723                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 724
 725                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 726                         break;
 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;
 887         struct mwifiex_tid_tbl *tid_ptr;
 888         atomic_t *hqp;
 889         unsigned long flags_bss, flags_ra;
 890         int i, j;
 891
 892         /* check the BSS with highest priority first */
 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                 /* iterate over BSS with the equal priority */
 898                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 899                                     &adapter->bss_prio_tbl[j].bss_prio_head,
 900                                     list) {
 901
 902                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 903
 904                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 905                                 continue;
 906
 907                         /* iterate over the WMM queues of the BSS */
 908                         hqp = &priv_tmp->wmm.highest_queued_prio;
 909                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 910
 911                                 spin_lock_irqsave(&priv_tmp->wmm.
 912                                                   ra_list_spinlock, flags_ra);
 913
 914                                 tid_ptr = &(priv_tmp)->wmm.
 915                                         tid_tbl_ptr[tos_to_tid[i]];
 916
 917                                 /* iterate over receiver addresses */
 918                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
 919                                                     list) {
 920
 921                                         if (!skb_queue_empty(&ptr->skb_head))
 922                                                 /* holds both locks */
 923                                                 goto found;
 924                                 }
 925
 926                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 927                                                        ra_list_spinlock,
 928                                                        flags_ra);
 929                         }
 930                 }
 931
 932                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 933                                        flags_bss);
 934         }
 935
 936         return NULL;
 937
 938 found:
 939         /* holds bss_prio_lock / ra_list_spinlock */
 940         if (atomic_read(hqp) > i)
 941                 atomic_set(hqp, i);
 942         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 943         spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 944                                flags_bss);
 945
 946         *priv = priv_tmp;
 947         *tid = tos_to_tid[i];
 948
 949         return ptr;
 950 }
 951
 952 /* This functions rotates ra and bss lists so packets are picked round robin.
 953  *
 954  * After a packet is successfully transmitted, rotate the ra list, so the ra
 955  * next to the one transmitted, will come first in the list. This way we pick
 956  * the ra' in a round robin fashion. Same applies to bss nodes of equal
 957  * priority.
 958  *
 959  * Function also increments wmm.packets_out counter.
 960  */
 961 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
 962                                  struct mwifiex_ra_list_tbl *ra,
 963                                  int tid)
 964 {
 965         struct mwifiex_adapter *adapter = priv->adapter;
 966         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
 967         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
 968         unsigned long flags;
 969
 970         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
 971         /*
 972          * dirty trick: we remove 'head' temporarily and reinsert it after
 973          * curr bss node. imagine list to stay fixed while head is moved
 974          */
 975         list_move(&tbl[priv->bss_priority].bss_prio_head,
 976                   &tbl[priv->bss_priority].bss_prio_cur->list);
 977         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
 978
 979         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 980         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
 981                 priv->wmm.packets_out[tid]++;
 982                 /* same as above */
 983                 list_move(&tid_ptr->ra_list, &ra->list);
 984         }
 985         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 986 }
 987
 988 /*
 989  * This function checks if 11n aggregation is possible.
 990  */
 991 static int
 992 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
 993                                     struct mwifiex_ra_list_tbl *ptr,
 994                                     int max_buf_size)
 995 {
 996         int count = 0, total_size = 0;
 997         struct sk_buff *skb, *tmp;
 998         int max_amsdu_size;
 999
1000         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1001             ptr->is_11n_enabled)
1002                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1003         else
1004                 max_amsdu_size = max_buf_size;
1005
1006         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1007                 total_size += skb->len;
1008                 if (total_size >= max_amsdu_size)
1009                         break;
1010                 if (++count >= MIN_NUM_AMSDU)
1011                         return true;
1012         }
1013
1014         return false;
1015 }
1016
1017 /*
1018  * This function sends a single packet to firmware for transmission.
1019  */
1020 static void
1021 mwifiex_send_single_packet(struct mwifiex_private *priv,
1022                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1023                            unsigned long ra_list_flags)
1024                            __releases(&priv->wmm.ra_list_spinlock)
1025 {
1026         struct sk_buff *skb, *skb_next;
1027         struct mwifiex_tx_param tx_param;
1028         struct mwifiex_adapter *adapter = priv->adapter;
1029         struct mwifiex_txinfo *tx_info;
1030
1031         if (skb_queue_empty(&ptr->skb_head)) {
1032                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1033                                        ra_list_flags);
1034                 dev_dbg(adapter->dev, "data: nothing to send\n");
1035                 return;
1036         }
1037
1038         skb = skb_dequeue(&ptr->skb_head);
1039
1040         tx_info = MWIFIEX_SKB_TXCB(skb);
1041         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1042
1043         ptr->total_pkt_count--;
1044
1045         if (!skb_queue_empty(&ptr->skb_head))
1046                 skb_next = skb_peek(&ptr->skb_head);
1047         else
1048                 skb_next = NULL;
1049
1050         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1051
1052         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1053                                 sizeof(struct txpd) : 0);
1054
1055         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1056                 /* Queue the packet back at the head */
1057                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1058
1059                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1060                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1061                                                ra_list_flags);
1062                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1063                         return;
1064                 }
1065
1066                 skb_queue_tail(&ptr->skb_head, skb);
1067
1068                 ptr->total_pkt_count++;
1069                 ptr->ba_pkt_count++;
1070                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1071                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1072                                        ra_list_flags);
1073         } else {
1074                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1075                 atomic_dec(&priv->wmm.tx_pkts_queued);
1076         }
1077 }
1078
1079 /*
1080  * This function checks if the first packet in the given RA list
1081  * is already processed or not.
1082  */
1083 static int
1084 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1085                          struct mwifiex_ra_list_tbl *ptr)
1086 {
1087         struct sk_buff *skb;
1088         struct mwifiex_txinfo *tx_info;
1089
1090         if (skb_queue_empty(&ptr->skb_head))
1091                 return false;
1092
1093         skb = skb_peek(&ptr->skb_head);
1094
1095         tx_info = MWIFIEX_SKB_TXCB(skb);
1096         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1097                 return true;
1098
1099         return false;
1100 }
1101
1102 /*
1103  * This function sends a single processed packet to firmware for
1104  * transmission.
1105  */
1106 static void
1107 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1108                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1109                               unsigned long ra_list_flags)
1110                                 __releases(&priv->wmm.ra_list_spinlock)
1111 {
1112         struct mwifiex_tx_param tx_param;
1113         struct mwifiex_adapter *adapter = priv->adapter;
1114         int ret = -1;
1115         struct sk_buff *skb, *skb_next;
1116         struct mwifiex_txinfo *tx_info;
1117
1118         if (skb_queue_empty(&ptr->skb_head)) {
1119                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1120                                        ra_list_flags);
1121                 return;
1122         }
1123
1124         skb = skb_dequeue(&ptr->skb_head);
1125
1126         if (!skb_queue_empty(&ptr->skb_head))
1127                 skb_next = skb_peek(&ptr->skb_head);
1128         else
1129                 skb_next = NULL;
1130
1131         tx_info = MWIFIEX_SKB_TXCB(skb);
1132
1133         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1134
1135         if (adapter->iface_type == MWIFIEX_USB) {
1136                 adapter->data_sent = true;
1137                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1138                                                    skb, NULL);
1139         } else {
1140                 tx_param.next_pkt_len =
1141                         ((skb_next) ? skb_next->len +
1142                          sizeof(struct txpd) : 0);
1143                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1144                                                    skb, &tx_param);
1145         }
1146
1147         switch (ret) {
1148         case -EBUSY:
1149                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1150                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1151
1152                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1153                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1154                                                ra_list_flags);
1155                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1156                         return;
1157                 }
1158
1159                 skb_queue_tail(&ptr->skb_head, skb);
1160
1161                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1162                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1163                                        ra_list_flags);
1164                 break;
1165         case -1:
1166                 if (adapter->iface_type != MWIFIEX_PCIE)
1167                         adapter->data_sent = false;
1168                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1169                 adapter->dbg.num_tx_host_to_card_failure++;
1170                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1171                 break;
1172         case -EINPROGRESS:
1173                 if (adapter->iface_type != MWIFIEX_PCIE)
1174                         adapter->data_sent = false;
1175         default:
1176                 break;
1177         }
1178         if (ret != -EBUSY) {
1179                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1180                 atomic_dec(&priv->wmm.tx_pkts_queued);
1181         }
1182 }
1183
1184 /*
1185  * This function dequeues a packet from the highest priority list
1186  * and transmits it.
1187  */
1188 static int
1189 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1190 {
1191         struct mwifiex_ra_list_tbl *ptr;
1192         struct mwifiex_private *priv = NULL;
1193         int ptr_index = 0;
1194         u8 ra[ETH_ALEN];
1195         int tid_del = 0, tid = 0;
1196         unsigned long flags;
1197
1198         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1199         if (!ptr)
1200                 return -1;
1201
1202         tid = mwifiex_get_tid(ptr);
1203
1204         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1205
1206         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1207         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1208                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1209                 return -1;
1210         }
1211
1212         if (mwifiex_is_ptr_processed(priv, ptr)) {
1213                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1214                 /* ra_list_spinlock has been freed in
1215                    mwifiex_send_processed_packet() */
1216                 return 0;
1217         }
1218
1219         if (!ptr->is_11n_enabled ||
1220             mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1221             priv->wps.session_enable ||
1222             ((priv->sec_info.wpa_enabled ||
1223               priv->sec_info.wpa2_enabled) &&
1224              !priv->wpa_is_gtk_set)) {
1225                 mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1226                 /* ra_list_spinlock has been freed in
1227                    mwifiex_send_single_packet() */
1228         } else {
1229                 if (mwifiex_is_ampdu_allowed(priv, tid) &&
1230                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1231                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1232                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1233                                                       BA_SETUP_INPROGRESS);
1234                                 mwifiex_send_addba(priv, tid, ptr->ra);
1235                         } else if (mwifiex_find_stream_to_delete
1236                                    (priv, tid, &tid_del, ra)) {
1237                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1238                                                       BA_SETUP_INPROGRESS);
1239                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1240                         }
1241                 }
1242                 if (enable_tx_amsdu && mwifiex_is_amsdu_allowed(priv, tid) &&
1243                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1244                                                         adapter->tx_buf_size))
1245                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1246                         /* ra_list_spinlock has been freed in
1247                            mwifiex_11n_aggregate_pkt() */
1248                 else
1249                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1250                         /* ra_list_spinlock has been freed in
1251                            mwifiex_send_single_packet() */
1252         }
1253         return 0;
1254 }
1255
1256 /*
1257  * This function transmits the highest priority packet awaiting in the
1258  * WMM Queues.
1259  */
1260 void
1261 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1262 {
1263         do {
1264                 /* Check if busy */
1265                 if (adapter->data_sent || adapter->tx_lock_flag)
1266                         break;
1267
1268                 if (mwifiex_dequeue_tx_packet(adapter))
1269                         break;
1270         } while (!mwifiex_wmm_lists_empty(adapter));
1271 }