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 disable_tx_amsdu;
  41 module_param(disable_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 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
  68
  69 /*
  70  * This function debug prints the priority parameters for a WMM AC.
  71  */
  72 static void
  73 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
  74 {
  75         const char *ac_str[] = { "BK", "BE", "VI", "VO" };
  76
  77         pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
  78                  "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
  79                  ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
  80                                              & MWIFIEX_ACI) >> 5]],
  81                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
  82                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
  83                  ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
  84                  ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
  85                  (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
  86                  le16_to_cpu(ac_param->tx_op_limit));
  87 }
  88
  89 /*
  90  * This function allocates a route address list.
  91  *
  92  * The function also initializes the list with the provided RA.
  93  */
  94 static struct mwifiex_ra_list_tbl *
  95 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
  96 {
  97         struct mwifiex_ra_list_tbl *ra_list;
  98
  99         ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
 100         if (!ra_list)
 101                 return NULL;
 102
 103         INIT_LIST_HEAD(&ra_list->list);
 104         skb_queue_head_init(&ra_list->skb_head);
 105
 106         memcpy(ra_list->ra, ra, ETH_ALEN);
 107
 108         ra_list->total_pkt_count = 0;
 109
 110         dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 111
 112         return ra_list;
 113 }
 114
 115 /* This function returns random no between 16 and 32 to be used as threshold
 116  * for no of packets after which BA setup is initiated.
 117  */
 118 static u8 mwifiex_get_random_ba_threshold(void)
 119 {
 120         u32 sec, usec;
 121         struct timeval ba_tstamp;
 122         u8 ba_threshold;
 123
 124         /* setup ba_packet_threshold here random number between
 125          * [BA_SETUP_PACKET_OFFSET,
 126          * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
 127          */
 128
 129         do_gettimeofday(&ba_tstamp);
 130         sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
 131         usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
 132         ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
 133                                                       + BA_SETUP_PACKET_OFFSET;
 134
 135         return ba_threshold;
 136 }
 137
 138 /*
 139  * This function allocates and adds a RA list for all TIDs
 140  * with the given RA.
 141  */
 142 void
 143 mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 144 {
 145         int i;
 146         struct mwifiex_ra_list_tbl *ra_list;
 147         struct mwifiex_adapter *adapter = priv->adapter;
 148         struct mwifiex_sta_node *node;
 149         unsigned long flags;
 150
 151         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 152         node = mwifiex_get_sta_entry(priv, ra);
 153         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 154
 155         for (i = 0; i < MAX_NUM_TID; ++i) {
 156                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 157                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 158
 159                 if (!ra_list)
 160                         break;
 161
 162                 ra_list->is_11n_enabled = 0;
 163                 ra_list->tdls_link = false;
 164                 if (!mwifiex_queuing_ra_based(priv)) {
 165                         if (mwifiex_get_tdls_link_status(priv, ra) ==
 166                             TDLS_SETUP_COMPLETE) {
 167                                 ra_list->is_11n_enabled =
 168                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 169                         } else {
 170                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 171                         }
 172                 } else {
 173                         ra_list->is_11n_enabled =
 174                                       mwifiex_is_sta_11n_enabled(priv, node);
 175                         if (ra_list->is_11n_enabled)
 176                                 ra_list->max_amsdu = node->max_amsdu;
 177                 }
 178
 179                 dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 180                         ra_list, ra_list->is_11n_enabled);
 181
 182                 if (ra_list->is_11n_enabled) {
 183                         ra_list->ba_pkt_count = 0;
 184                         ra_list->ba_packet_thr =
 185                                               mwifiex_get_random_ba_threshold();
 186                 }
 187                 list_add_tail(&ra_list->list,
 188                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 189         }
 190 }
 191
 192 /*
 193  * This function sets the WMM queue priorities to their default values.
 194  */
 195 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 196 {
 197         /* Default queue priorities: VO->VI->BE->BK */
 198         priv->wmm.queue_priority[0] = WMM_AC_VO;
 199         priv->wmm.queue_priority[1] = WMM_AC_VI;
 200         priv->wmm.queue_priority[2] = WMM_AC_BE;
 201         priv->wmm.queue_priority[3] = WMM_AC_BK;
 202 }
 203
 204 /*
 205  * This function map ACs to TIDs.
 206  */
 207 static void
 208 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
 209 {
 210         struct mwifiex_wmm_desc *wmm = &priv->wmm;
 211         u8 *queue_priority = wmm->queue_priority;
 212         int i;
 213
 214         for (i = 0; i < 4; ++i) {
 215                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 216                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 217         }
 218
 219         for (i = 0; i < MAX_NUM_TID; ++i)
 220                 priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 221
 222         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 223 }
 224
 225 /*
 226  * This function initializes WMM priority queues.
 227  */
 228 void
 229 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 230                                    struct ieee_types_wmm_parameter *wmm_ie)
 231 {
 232         u16 cw_min, avg_back_off, tmp[4];
 233         u32 i, j, num_ac;
 234         u8 ac_idx;
 235
 236         if (!wmm_ie || !priv->wmm_enabled) {
 237                 /* WMM is not enabled, just set the defaults and return */
 238                 mwifiex_wmm_default_queue_priorities(priv);
 239                 return;
 240         }
 241
 242         dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
 243                 "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 244                 wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 245                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 246                 wmm_ie->reserved);
 247
 248         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 249                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 250                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 251                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 252                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 253
 254                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 255                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 256                 tmp[ac_idx] = avg_back_off;
 257
 258                 dev_dbg(priv->adapter->dev,
 259                         "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 260                         (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 261                         cw_min, avg_back_off);
 262                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 263         }
 264
 265         /* Bubble sort */
 266         for (i = 0; i < num_ac; i++) {
 267                 for (j = 1; j < num_ac - i; j++) {
 268                         if (tmp[j - 1] > tmp[j]) {
 269                                 swap(tmp[j - 1], tmp[j]);
 270                                 swap(priv->wmm.queue_priority[j - 1],
 271                                      priv->wmm.queue_priority[j]);
 272                         } else if (tmp[j - 1] == tmp[j]) {
 273                                 if (priv->wmm.queue_priority[j - 1]
 274                                     < priv->wmm.queue_priority[j])
 275                                         swap(priv->wmm.queue_priority[j - 1],
 276                                              priv->wmm.queue_priority[j]);
 277                         }
 278                 }
 279         }
 280
 281         mwifiex_wmm_queue_priorities_tid(priv);
 282 }
 283
 284 /*
 285  * This function evaluates whether or not an AC is to be downgraded.
 286  *
 287  * In case the AC is not enabled, the highest AC is returned that is
 288  * enabled and does not require admission control.
 289  */
 290 static enum mwifiex_wmm_ac_e
 291 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 292                               enum mwifiex_wmm_ac_e eval_ac)
 293 {
 294         int down_ac;
 295         enum mwifiex_wmm_ac_e ret_ac;
 296         struct mwifiex_wmm_ac_status *ac_status;
 297
 298         ac_status = &priv->wmm.ac_status[eval_ac];
 299
 300         if (!ac_status->disabled)
 301                 /* Okay to use this AC, its enabled */
 302                 return eval_ac;
 303
 304         /* Setup a default return value of the lowest priority */
 305         ret_ac = WMM_AC_BK;
 306
 307         /*
 308          *  Find the highest AC that is enabled and does not require
 309          *  admission control. The spec disallows downgrading to an AC,
 310          *  which is enabled due to a completed admission control.
 311          *  Unadmitted traffic is not to be sent on an AC with admitted
 312          *  traffic.
 313          */
 314         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 315                 ac_status = &priv->wmm.ac_status[down_ac];
 316
 317                 if (!ac_status->disabled && !ac_status->flow_required)
 318                         /* AC is enabled and does not require admission
 319                            control */
 320                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 321         }
 322
 323         return ret_ac;
 324 }
 325
 326 /*
 327  * This function downgrades WMM priority queue.
 328  */
 329 void
 330 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 331 {
 332         int ac_val;
 333
 334         dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
 335                         "BK(0), BE(1), VI(2), VO(3)\n");
 336
 337         if (!priv->wmm_enabled) {
 338                 /* WMM is not enabled, default priorities */
 339                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 340                         priv->wmm.ac_down_graded_vals[ac_val] =
 341                                                 (enum mwifiex_wmm_ac_e) ac_val;
 342         } else {
 343                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 344                         priv->wmm.ac_down_graded_vals[ac_val]
 345                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 346                                                 (enum mwifiex_wmm_ac_e) ac_val);
 347                         dev_dbg(priv->adapter->dev,
 348                                 "info: WMM: AC PRIO %d maps to %d\n",
 349                                 ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
 350                 }
 351         }
 352 }
 353
 354 /*
 355  * This function converts the IP TOS field to an WMM AC
 356  * Queue assignment.
 357  */
 358 static enum mwifiex_wmm_ac_e
 359 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 360 {
 361         /* Map of TOS UP values to WMM AC */
 362         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 363                 WMM_AC_BK,
 364                 WMM_AC_BK,
 365                 WMM_AC_BE,
 366                 WMM_AC_VI,
 367                 WMM_AC_VI,
 368                 WMM_AC_VO,
 369                 WMM_AC_VO
 370         };
 371
 372         if (tos >= ARRAY_SIZE(tos_to_ac))
 373                 return WMM_AC_BE;
 374
 375         return tos_to_ac[tos];
 376 }
 377
 378 /*
 379  * This function evaluates a given TID and downgrades it to a lower
 380  * TID if the WMM Parameter IE received from the AP indicates that the
 381  * AP is disabled (due to call admission control (ACM bit). Mapping
 382  * of TID to AC is taken care of internally.
 383  */
 384 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 385 {
 386         enum mwifiex_wmm_ac_e ac, ac_down;
 387         u8 new_tid;
 388
 389         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 390         ac_down = priv->wmm.ac_down_graded_vals[ac];
 391
 392         /* Send the index to tid array, picking from the array will be
 393          * taken care by dequeuing function
 394          */
 395         new_tid = ac_to_tid[ac_down][tid % 2];
 396
 397         return new_tid;
 398 }
 399
 400 /*
 401  * This function initializes the WMM state information and the
 402  * WMM data path queues.
 403  */
 404 void
 405 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 406 {
 407         int i, j;
 408         struct mwifiex_private *priv;
 409
 410         for (j = 0; j < adapter->priv_num; ++j) {
 411                 priv = adapter->priv[j];
 412                 if (!priv)
 413                         continue;
 414
 415                 for (i = 0; i < MAX_NUM_TID; ++i) {
 416                         if (!disable_tx_amsdu &&
 417                             adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
 418                                 priv->aggr_prio_tbl[i].amsdu =
 419                                                         priv->tos_to_tid_inv[i];
 420                         else
 421                                 priv->aggr_prio_tbl[i].amsdu =
 422                                                         BA_STREAM_NOT_ALLOWED;
 423                         priv->aggr_prio_tbl[i].ampdu_ap =
 424                                                         priv->tos_to_tid_inv[i];
 425                         priv->aggr_prio_tbl[i].ampdu_user =
 426                                                         priv->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         struct sk_buff *skb, *tmp;
 550
 551         mwifiex_11n_cleanup_reorder_tbl(priv);
 552         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 553
 554         mwifiex_wmm_cleanup_queues(priv);
 555         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 556
 557         if (priv->adapter->if_ops.cleanup_mpa_buf)
 558                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 559
 560         mwifiex_wmm_delete_all_ralist(priv);
 561         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 562
 563         if (priv->adapter->if_ops.clean_pcie_ring &&
 564             !priv->adapter->surprise_removed)
 565                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 566         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 567
 568         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 569                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 570 }
 571
 572 /*
 573  * This function retrieves a particular RA list node, matching with the
 574  * given TID and RA address.
 575  */
 576 static struct mwifiex_ra_list_tbl *
 577 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 578                             u8 *ra_addr)
 579 {
 580         struct mwifiex_ra_list_tbl *ra_list;
 581
 582         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 583                             list) {
 584                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 585                         return ra_list;
 586         }
 587
 588         return NULL;
 589 }
 590
 591 /*
 592  * This function retrieves an RA list node for a given TID and
 593  * RA address pair.
 594  *
 595  * If no such node is found, a new node is added first and then
 596  * retrieved.
 597  */
 598 struct mwifiex_ra_list_tbl *
 599 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, u8 *ra_addr)
 600 {
 601         struct mwifiex_ra_list_tbl *ra_list;
 602
 603         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 604         if (ra_list)
 605                 return ra_list;
 606         mwifiex_ralist_add(priv, ra_addr);
 607
 608         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 609 }
 610
 611 /*
 612  * This function checks if a particular RA list node exists in a given TID
 613  * table index.
 614  */
 615 int
 616 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 617                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 618 {
 619         struct mwifiex_ra_list_tbl *rlist;
 620
 621         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 622                             list) {
 623                 if (rlist == ra_list)
 624                         return true;
 625         }
 626
 627         return false;
 628 }
 629
 630 /*
 631  * This function adds a packet to WMM queue.
 632  *
 633  * In disconnected state the packet is immediately dropped and the
 634  * packet send completion callback is called with status failure.
 635  *
 636  * Otherwise, the correct RA list node is located and the packet
 637  * is queued at the list tail.
 638  */
 639 void
 640 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 641                             struct sk_buff *skb)
 642 {
 643         struct mwifiex_adapter *adapter = priv->adapter;
 644         u32 tid;
 645         struct mwifiex_ra_list_tbl *ra_list;
 646         u8 ra[ETH_ALEN], tid_down;
 647         unsigned long flags;
 648         struct list_head list_head;
 649         int tdls_status = TDLS_NOT_SETUP;
 650         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 651         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 652
 653         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 654
 655         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 656             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 657                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 658                         dev_dbg(adapter->dev,
 659                                 "TDLS setup packet for %pM. Don't block\n", ra);
 660                 else
 661                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 662         }
 663
 664         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 665                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 666                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 667                 return;
 668         }
 669
 670         tid = skb->priority;
 671
 672         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 673
 674         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 675
 676         /* In case of infra as we have already created the list during
 677            association we just don't have to call get_queue_raptr, we will
 678            have only 1 raptr for a tid in case of infra */
 679         if (!mwifiex_queuing_ra_based(priv) &&
 680             !mwifiex_is_skb_mgmt_frame(skb)) {
 681                 switch (tdls_status) {
 682                 case TDLS_SETUP_COMPLETE:
 683                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 684                                                               ra);
 685                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 686                         break;
 687                 case TDLS_SETUP_INPROGRESS:
 688                         skb_queue_tail(&priv->tdls_txq, skb);
 689                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 690                                                flags);
 691                         return;
 692                 default:
 693                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 694                         if (!list_empty(&list_head))
 695                                 ra_list = list_first_entry(
 696                                         &list_head, struct mwifiex_ra_list_tbl,
 697                                         list);
 698                         else
 699                                 ra_list = NULL;
 700                         break;
 701                 }
 702         } else {
 703                 memcpy(ra, skb->data, ETH_ALEN);
 704                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 705                         memset(ra, 0xff, ETH_ALEN);
 706                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 707         }
 708
 709         if (!ra_list) {
 710                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 711                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 712                 return;
 713         }
 714
 715         skb_queue_tail(&ra_list->skb_head, skb);
 716
 717         ra_list->ba_pkt_count++;
 718         ra_list->total_pkt_count++;
 719
 720         if (atomic_read(&priv->wmm.highest_queued_prio) <
 721                                                 priv->tos_to_tid_inv[tid_down])
 722                 atomic_set(&priv->wmm.highest_queued_prio,
 723                            priv->tos_to_tid_inv[tid_down]);
 724
 725         atomic_inc(&priv->wmm.tx_pkts_queued);
 726
 727         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 728 }
 729
 730 /*
 731  * This function processes the get WMM status command response from firmware.
 732  *
 733  * The response may contain multiple TLVs -
 734  *      - AC Queue status TLVs
 735  *      - Current WMM Parameter IE TLV
 736  *      - Admission Control action frame TLVs
 737  *
 738  * This function parses the TLVs and then calls further specific functions
 739  * to process any changes in the queue prioritize or state.
 740  */
 741 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 742                                const struct host_cmd_ds_command *resp)
 743 {
 744         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 745         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 746         bool valid = true;
 747
 748         struct mwifiex_ie_types_data *tlv_hdr;
 749         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 750         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 751         struct mwifiex_wmm_ac_status *ac_status;
 752
 753         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 754                 resp_len);
 755
 756         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 757                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 758                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 759
 760                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 761                         break;
 762
 763                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 764                 case TLV_TYPE_WMMQSTATUS:
 765                         tlv_wmm_qstatus =
 766                                 (struct mwifiex_ie_types_wmm_queue_status *)
 767                                 tlv_hdr;
 768                         dev_dbg(priv->adapter->dev,
 769                                 "info: CMD_RESP: WMM_GET_STATUS:"
 770                                 " QSTATUS TLV: %d, %d, %d\n",
 771                                 tlv_wmm_qstatus->queue_index,
 772                                 tlv_wmm_qstatus->flow_required,
 773                                 tlv_wmm_qstatus->disabled);
 774
 775                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 776                                                          queue_index];
 777                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 778                         ac_status->flow_required =
 779                                                 tlv_wmm_qstatus->flow_required;
 780                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 781                         break;
 782
 783                 case WLAN_EID_VENDOR_SPECIFIC:
 784                         /*
 785                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 786                          *   and setup the IEEE IE type and length byte fields
 787                          */
 788
 789                         wmm_param_ie =
 790                                 (struct ieee_types_wmm_parameter *) (curr +
 791                                                                     2);
 792                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 793                         wmm_param_ie->vend_hdr.element_id =
 794                                                 WLAN_EID_VENDOR_SPECIFIC;
 795
 796                         dev_dbg(priv->adapter->dev,
 797                                 "info: CMD_RESP: WMM_GET_STATUS:"
 798                                 " WMM Parameter Set Count: %d\n",
 799                                 wmm_param_ie->qos_info_bitmap &
 800                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 801
 802                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 803                                wmm_ie, wmm_param_ie,
 804                                wmm_param_ie->vend_hdr.len + 2);
 805
 806                         break;
 807
 808                 default:
 809                         valid = false;
 810                         break;
 811                 }
 812
 813                 curr += (tlv_len + sizeof(tlv_hdr->header));
 814                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 815         }
 816
 817         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 818         mwifiex_wmm_setup_ac_downgrade(priv);
 819
 820         return 0;
 821 }
 822
 823 /*
 824  * Callback handler from the command module to allow insertion of a WMM TLV.
 825  *
 826  * If the BSS we are associating to supports WMM, this function adds the
 827  * required WMM Information IE to the association request command buffer in
 828  * the form of a Marvell extended IEEE IE.
 829  */
 830 u32
 831 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 832                                     u8 **assoc_buf,
 833                                     struct ieee_types_wmm_parameter *wmm_ie,
 834                                     struct ieee80211_ht_cap *ht_cap)
 835 {
 836         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 837         u32 ret_len = 0;
 838
 839         /* Null checks */
 840         if (!assoc_buf)
 841                 return 0;
 842         if (!(*assoc_buf))
 843                 return 0;
 844
 845         if (!wmm_ie)
 846                 return 0;
 847
 848         dev_dbg(priv->adapter->dev,
 849                 "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 850                 wmm_ie->vend_hdr.element_id);
 851
 852         if ((priv->wmm_required ||
 853              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 854              priv->adapter->config_bands & BAND_AN))) &&
 855             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 856                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 857                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 858                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 859                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 860                        le16_to_cpu(wmm_tlv->header.len));
 861                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 862                         memcpy((u8 *) (wmm_tlv->wmm_ie
 863                                        + le16_to_cpu(wmm_tlv->header.len)
 864                                        - sizeof(priv->wmm_qosinfo)),
 865                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 866
 867                 ret_len = sizeof(wmm_tlv->header)
 868                           + le16_to_cpu(wmm_tlv->header.len);
 869
 870                 *assoc_buf += ret_len;
 871         }
 872
 873         return ret_len;
 874 }
 875
 876 /*
 877  * This function computes the time delay in the driver queues for a
 878  * given packet.
 879  *
 880  * When the packet is received at the OS/Driver interface, the current
 881  * time is set in the packet structure. The difference between the present
 882  * time and that received time is computed in this function and limited
 883  * based on pre-compiled limits in the driver.
 884  */
 885 u8
 886 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 887                                   const struct sk_buff *skb)
 888 {
 889         u8 ret_val;
 890         struct timeval out_tstamp, in_tstamp;
 891         u32 queue_delay;
 892
 893         do_gettimeofday(&out_tstamp);
 894         in_tstamp = ktime_to_timeval(skb->tstamp);
 895
 896         queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
 897         queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;
 898
 899         /*
 900          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 901          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 902          *
 903          * Pass max value if queue_delay is beyond the uint8 range
 904          */
 905         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 906
 907         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 908                                 " %d ms sent to FW\n", queue_delay, ret_val);
 909
 910         return ret_val;
 911 }
 912
 913 /*
 914  * This function retrieves the highest priority RA list table pointer.
 915  */
 916 static struct mwifiex_ra_list_tbl *
 917 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 918                                      struct mwifiex_private **priv, int *tid)
 919 {
 920         struct mwifiex_private *priv_tmp;
 921         struct mwifiex_ra_list_tbl *ptr;
 922         struct mwifiex_tid_tbl *tid_ptr;
 923         atomic_t *hqp;
 924         unsigned long flags_bss, flags_ra;
 925         int i, j;
 926
 927         /* check the BSS with highest priority first */
 928         for (j = adapter->priv_num - 1; j >= 0; --j) {
 929                 spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 930                                   flags_bss);
 931
 932                 /* iterate over BSS with the equal priority */
 933                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 934                                     &adapter->bss_prio_tbl[j].bss_prio_head,
 935                                     list) {
 936
 937                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 938
 939                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 940                                 continue;
 941
 942                         /* iterate over the WMM queues of the BSS */
 943                         hqp = &priv_tmp->wmm.highest_queued_prio;
 944                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 945
 946                                 spin_lock_irqsave(&priv_tmp->wmm.
 947                                                   ra_list_spinlock, flags_ra);
 948
 949                                 tid_ptr = &(priv_tmp)->wmm.
 950                                         tid_tbl_ptr[tos_to_tid[i]];
 951
 952                                 /* iterate over receiver addresses */
 953                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
 954                                                     list) {
 955
 956                                         if (!skb_queue_empty(&ptr->skb_head))
 957                                                 /* holds both locks */
 958                                                 goto found;
 959                                 }
 960
 961                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 962                                                        ra_list_spinlock,
 963                                                        flags_ra);
 964                         }
 965                 }
 966
 967                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 968                                        flags_bss);
 969         }
 970
 971         return NULL;
 972
 973 found:
 974         /* holds bss_prio_lock / ra_list_spinlock */
 975         if (atomic_read(hqp) > i)
 976                 atomic_set(hqp, i);
 977         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 978         spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 979                                flags_bss);
 980
 981         *priv = priv_tmp;
 982         *tid = tos_to_tid[i];
 983
 984         return ptr;
 985 }
 986
 987 /* This functions rotates ra and bss lists so packets are picked round robin.
 988  *
 989  * After a packet is successfully transmitted, rotate the ra list, so the ra
 990  * next to the one transmitted, will come first in the list. This way we pick
 991  * the ra' in a round robin fashion. Same applies to bss nodes of equal
 992  * priority.
 993  *
 994  * Function also increments wmm.packets_out counter.
 995  */
 996 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
 997                                  struct mwifiex_ra_list_tbl *ra,
 998                                  int tid)
 999 {
1000         struct mwifiex_adapter *adapter = priv->adapter;
1001         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1002         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1003         unsigned long flags;
1004
1005         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1006         /*
1007          * dirty trick: we remove 'head' temporarily and reinsert it after
1008          * curr bss node. imagine list to stay fixed while head is moved
1009          */
1010         list_move(&tbl[priv->bss_priority].bss_prio_head,
1011                   &tbl[priv->bss_priority].bss_prio_cur->list);
1012         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1013
1014         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1015         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1016                 priv->wmm.packets_out[tid]++;
1017                 /* same as above */
1018                 list_move(&tid_ptr->ra_list, &ra->list);
1019         }
1020         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1021 }
1022
1023 /*
1024  * This function checks if 11n aggregation is possible.
1025  */
1026 static int
1027 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1028                                     struct mwifiex_ra_list_tbl *ptr,
1029                                     int max_buf_size)
1030 {
1031         int count = 0, total_size = 0;
1032         struct sk_buff *skb, *tmp;
1033         int max_amsdu_size;
1034
1035         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1036             ptr->is_11n_enabled)
1037                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1038         else
1039                 max_amsdu_size = max_buf_size;
1040
1041         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1042                 total_size += skb->len;
1043                 if (total_size >= max_amsdu_size)
1044                         break;
1045                 if (++count >= MIN_NUM_AMSDU)
1046                         return true;
1047         }
1048
1049         return false;
1050 }
1051
1052 /*
1053  * This function sends a single packet to firmware for transmission.
1054  */
1055 static void
1056 mwifiex_send_single_packet(struct mwifiex_private *priv,
1057                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1058                            unsigned long ra_list_flags)
1059                            __releases(&priv->wmm.ra_list_spinlock)
1060 {
1061         struct sk_buff *skb, *skb_next;
1062         struct mwifiex_tx_param tx_param;
1063         struct mwifiex_adapter *adapter = priv->adapter;
1064         struct mwifiex_txinfo *tx_info;
1065
1066         if (skb_queue_empty(&ptr->skb_head)) {
1067                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1068                                        ra_list_flags);
1069                 dev_dbg(adapter->dev, "data: nothing to send\n");
1070                 return;
1071         }
1072
1073         skb = skb_dequeue(&ptr->skb_head);
1074
1075         tx_info = MWIFIEX_SKB_TXCB(skb);
1076         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1077
1078         ptr->total_pkt_count--;
1079
1080         if (!skb_queue_empty(&ptr->skb_head))
1081                 skb_next = skb_peek(&ptr->skb_head);
1082         else
1083                 skb_next = NULL;
1084
1085         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1086
1087         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1088                                 sizeof(struct txpd) : 0);
1089
1090         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1091                 /* Queue the packet back at the head */
1092                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1093
1094                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1095                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1096                                                ra_list_flags);
1097                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1098                         return;
1099                 }
1100
1101                 skb_queue_tail(&ptr->skb_head, skb);
1102
1103                 ptr->total_pkt_count++;
1104                 ptr->ba_pkt_count++;
1105                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1106                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1107                                        ra_list_flags);
1108         } else {
1109                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1110                 atomic_dec(&priv->wmm.tx_pkts_queued);
1111         }
1112 }
1113
1114 /*
1115  * This function checks if the first packet in the given RA list
1116  * is already processed or not.
1117  */
1118 static int
1119 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1120                          struct mwifiex_ra_list_tbl *ptr)
1121 {
1122         struct sk_buff *skb;
1123         struct mwifiex_txinfo *tx_info;
1124
1125         if (skb_queue_empty(&ptr->skb_head))
1126                 return false;
1127
1128         skb = skb_peek(&ptr->skb_head);
1129
1130         tx_info = MWIFIEX_SKB_TXCB(skb);
1131         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1132                 return true;
1133
1134         return false;
1135 }
1136
1137 /*
1138  * This function sends a single processed packet to firmware for
1139  * transmission.
1140  */
1141 static void
1142 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1143                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1144                               unsigned long ra_list_flags)
1145                                 __releases(&priv->wmm.ra_list_spinlock)
1146 {
1147         struct mwifiex_tx_param tx_param;
1148         struct mwifiex_adapter *adapter = priv->adapter;
1149         int ret = -1;
1150         struct sk_buff *skb, *skb_next;
1151         struct mwifiex_txinfo *tx_info;
1152
1153         if (skb_queue_empty(&ptr->skb_head)) {
1154                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1155                                        ra_list_flags);
1156                 return;
1157         }
1158
1159         skb = skb_dequeue(&ptr->skb_head);
1160
1161         if (!skb_queue_empty(&ptr->skb_head))
1162                 skb_next = skb_peek(&ptr->skb_head);
1163         else
1164                 skb_next = NULL;
1165
1166         tx_info = MWIFIEX_SKB_TXCB(skb);
1167
1168         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1169
1170         if (adapter->iface_type == MWIFIEX_USB) {
1171                 adapter->data_sent = true;
1172                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1173                                                    skb, NULL);
1174         } else {
1175                 tx_param.next_pkt_len =
1176                         ((skb_next) ? skb_next->len +
1177                          sizeof(struct txpd) : 0);
1178                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1179                                                    skb, &tx_param);
1180         }
1181
1182         switch (ret) {
1183         case -EBUSY:
1184                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1185                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1186
1187                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1188                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1189                                                ra_list_flags);
1190                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1191                         return;
1192                 }
1193
1194                 skb_queue_tail(&ptr->skb_head, skb);
1195
1196                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1197                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1198                                        ra_list_flags);
1199                 break;
1200         case -1:
1201                 if (adapter->iface_type != MWIFIEX_PCIE)
1202                         adapter->data_sent = false;
1203                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1204                 adapter->dbg.num_tx_host_to_card_failure++;
1205                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1206                 break;
1207         case -EINPROGRESS:
1208                 if (adapter->iface_type != MWIFIEX_PCIE)
1209                         adapter->data_sent = false;
1210         default:
1211                 break;
1212         }
1213         if (ret != -EBUSY) {
1214                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1215                 atomic_dec(&priv->wmm.tx_pkts_queued);
1216         }
1217 }
1218
1219 /*
1220  * This function dequeues a packet from the highest priority list
1221  * and transmits it.
1222  */
1223 static int
1224 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1225 {
1226         struct mwifiex_ra_list_tbl *ptr;
1227         struct mwifiex_private *priv = NULL;
1228         int ptr_index = 0;
1229         u8 ra[ETH_ALEN];
1230         int tid_del = 0, tid = 0;
1231         unsigned long flags;
1232
1233         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1234         if (!ptr)
1235                 return -1;
1236
1237         tid = mwifiex_get_tid(ptr);
1238
1239         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1240
1241         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1242         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1243                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1244                 return -1;
1245         }
1246
1247         if (mwifiex_is_ptr_processed(priv, ptr)) {
1248                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1249                 /* ra_list_spinlock has been freed in
1250                    mwifiex_send_processed_packet() */
1251                 return 0;
1252         }
1253
1254         if (!ptr->is_11n_enabled ||
1255             mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1256             priv->wps.session_enable) {
1257                 if (ptr->is_11n_enabled &&
1258                     mwifiex_is_ba_stream_setup(priv, ptr, tid) &&
1259                     mwifiex_is_amsdu_in_ampdu_allowed(priv, ptr, tid) &&
1260                     mwifiex_is_amsdu_allowed(priv, tid) &&
1261                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1262                                                         adapter->tx_buf_size))
1263                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1264                         /* ra_list_spinlock has been freed in
1265                          * mwifiex_11n_aggregate_pkt()
1266                          */
1267                 else
1268                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1269                         /* ra_list_spinlock has been freed in
1270                          * mwifiex_send_single_packet()
1271                          */
1272         } else {
1273                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1274                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1275                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1276                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1277                                                       BA_SETUP_INPROGRESS);
1278                                 mwifiex_send_addba(priv, tid, ptr->ra);
1279                         } else if (mwifiex_find_stream_to_delete
1280                                    (priv, tid, &tid_del, ra)) {
1281                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1282                                                       BA_SETUP_INPROGRESS);
1283                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1284                         }
1285                 }
1286                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1287                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1288                                                         adapter->tx_buf_size))
1289                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1290                         /* ra_list_spinlock has been freed in
1291                            mwifiex_11n_aggregate_pkt() */
1292                 else
1293                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1294                         /* ra_list_spinlock has been freed in
1295                            mwifiex_send_single_packet() */
1296         }
1297         return 0;
1298 }
1299
1300 /*
1301  * This function transmits the highest priority packet awaiting in the
1302  * WMM Queues.
1303  */
1304 void
1305 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1306 {
1307         do {
1308                 /* Check if busy */
1309                 if (adapter->data_sent || adapter->tx_lock_flag)
1310                         break;
1311
1312                 if (mwifiex_dequeue_tx_packet(adapter))
1313                         break;
1314         } while (!mwifiex_wmm_lists_empty(adapter));
1315 }