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, const 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 mwifiex_ralist_add(struct mwifiex_private *priv, const u8 *ra)
 143 {
 144         int i;
 145         struct mwifiex_ra_list_tbl *ra_list;
 146         struct mwifiex_adapter *adapter = priv->adapter;
 147         struct mwifiex_sta_node *node;
 148         unsigned long flags;
 149
 150         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 151         node = mwifiex_get_sta_entry(priv, ra);
 152         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 153
 154         for (i = 0; i < MAX_NUM_TID; ++i) {
 155                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 156                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 157
 158                 if (!ra_list)
 159                         break;
 160
 161                 ra_list->is_11n_enabled = 0;
 162                 ra_list->tdls_link = false;
 163                 if (!mwifiex_queuing_ra_based(priv)) {
 164                         if (mwifiex_get_tdls_link_status(priv, ra) ==
 165                             TDLS_SETUP_COMPLETE) {
 166                                 ra_list->tdls_link = true;
 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                 mwifiex_set_ba_params(priv);
 430                 mwifiex_reset_11n_rx_seq_num(priv);
 431
 432                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 433                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 434         }
 435 }
 436
 437 /*
 438  * This function checks if WMM Tx queue is empty.
 439  */
 440 int
 441 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 442 {
 443         int i;
 444         struct mwifiex_private *priv;
 445
 446         for (i = 0; i < adapter->priv_num; ++i) {
 447                 priv = adapter->priv[i];
 448                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 449                         return false;
 450         }
 451
 452         return true;
 453 }
 454
 455 /*
 456  * This function deletes all packets in an RA list node.
 457  *
 458  * The packet sent completion callback handler are called with
 459  * status failure, after they are dequeued to ensure proper
 460  * cleanup. The RA list node itself is freed at the end.
 461  */
 462 static void
 463 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 464                                     struct mwifiex_ra_list_tbl *ra_list)
 465 {
 466         struct mwifiex_adapter *adapter = priv->adapter;
 467         struct sk_buff *skb, *tmp;
 468
 469         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 470                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 471 }
 472
 473 /*
 474  * This function deletes all packets in an RA list.
 475  *
 476  * Each nodes in the RA list are freed individually first, and then
 477  * the RA list itself is freed.
 478  */
 479 static void
 480 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 481                                struct list_head *ra_list_head)
 482 {
 483         struct mwifiex_ra_list_tbl *ra_list;
 484
 485         list_for_each_entry(ra_list, ra_list_head, list)
 486                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 487 }
 488
 489 /*
 490  * This function deletes all packets in all RA lists.
 491  */
 492 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 493 {
 494         int i;
 495
 496         for (i = 0; i < MAX_NUM_TID; i++)
 497                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 498                                                                        ra_list);
 499
 500         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 501         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 502 }
 503
 504 /*
 505  * This function deletes all route addresses from all RA lists.
 506  */
 507 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 508 {
 509         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 510         int i;
 511
 512         for (i = 0; i < MAX_NUM_TID; ++i) {
 513                 dev_dbg(priv->adapter->dev,
 514                         "info: ra_list: freeing buf for tid %d\n", i);
 515                 list_for_each_entry_safe(ra_list, tmp_node,
 516                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 517                                          list) {
 518                         list_del(&ra_list->list);
 519                         kfree(ra_list);
 520                 }
 521
 522                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 523         }
 524 }
 525
 526 /*
 527  * This function cleans up the Tx and Rx queues.
 528  *
 529  * Cleanup includes -
 530  *      - All packets in RA lists
 531  *      - All entries in Rx reorder table
 532  *      - All entries in Tx BA stream table
 533  *      - MPA buffer (if required)
 534  *      - All RA lists
 535  */
 536 void
 537 mwifiex_clean_txrx(struct mwifiex_private *priv)
 538 {
 539         unsigned long flags;
 540         struct sk_buff *skb, *tmp;
 541
 542         mwifiex_11n_cleanup_reorder_tbl(priv);
 543         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 544
 545         mwifiex_wmm_cleanup_queues(priv);
 546         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 547
 548         if (priv->adapter->if_ops.cleanup_mpa_buf)
 549                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 550
 551         mwifiex_wmm_delete_all_ralist(priv);
 552         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 553
 554         if (priv->adapter->if_ops.clean_pcie_ring &&
 555             !priv->adapter->surprise_removed)
 556                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 557         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 558
 559         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 560                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 561 }
 562
 563 /*
 564  * This function retrieves a particular RA list node, matching with the
 565  * given TID and RA address.
 566  */
 567 static struct mwifiex_ra_list_tbl *
 568 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 569                             const u8 *ra_addr)
 570 {
 571         struct mwifiex_ra_list_tbl *ra_list;
 572
 573         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 574                             list) {
 575                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 576                         return ra_list;
 577         }
 578
 579         return NULL;
 580 }
 581
 582 /*
 583  * This function retrieves an RA list node for a given TID and
 584  * RA address pair.
 585  *
 586  * If no such node is found, a new node is added first and then
 587  * retrieved.
 588  */
 589 struct mwifiex_ra_list_tbl *
 590 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 591                             const u8 *ra_addr)
 592 {
 593         struct mwifiex_ra_list_tbl *ra_list;
 594
 595         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 596         if (ra_list)
 597                 return ra_list;
 598         mwifiex_ralist_add(priv, ra_addr);
 599
 600         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 601 }
 602
 603 /*
 604  * This function checks if a particular RA list node exists in a given TID
 605  * table index.
 606  */
 607 int
 608 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 609                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 610 {
 611         struct mwifiex_ra_list_tbl *rlist;
 612
 613         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 614                             list) {
 615                 if (rlist == ra_list)
 616                         return true;
 617         }
 618
 619         return false;
 620 }
 621
 622 /*
 623  * This function adds a packet to WMM queue.
 624  *
 625  * In disconnected state the packet is immediately dropped and the
 626  * packet send completion callback is called with status failure.
 627  *
 628  * Otherwise, the correct RA list node is located and the packet
 629  * is queued at the list tail.
 630  */
 631 void
 632 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 633                             struct sk_buff *skb)
 634 {
 635         struct mwifiex_adapter *adapter = priv->adapter;
 636         u32 tid;
 637         struct mwifiex_ra_list_tbl *ra_list;
 638         u8 ra[ETH_ALEN], tid_down;
 639         unsigned long flags;
 640         struct list_head list_head;
 641         int tdls_status = TDLS_NOT_SETUP;
 642         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 643         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 644
 645         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 646
 647         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 648             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 649                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 650                         dev_dbg(adapter->dev,
 651                                 "TDLS setup packet for %pM. Don't block\n", ra);
 652                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 653                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 654         }
 655
 656         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 657                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 658                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 659                 return;
 660         }
 661
 662         tid = skb->priority;
 663
 664         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 665
 666         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 667
 668         /* In case of infra as we have already created the list during
 669            association we just don't have to call get_queue_raptr, we will
 670            have only 1 raptr for a tid in case of infra */
 671         if (!mwifiex_queuing_ra_based(priv) &&
 672             !mwifiex_is_skb_mgmt_frame(skb)) {
 673                 switch (tdls_status) {
 674                 case TDLS_SETUP_COMPLETE:
 675                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 676                                                               ra);
 677                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 678                         break;
 679                 case TDLS_SETUP_INPROGRESS:
 680                         skb_queue_tail(&priv->tdls_txq, skb);
 681                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 682                                                flags);
 683                         return;
 684                 default:
 685                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 686                         if (!list_empty(&list_head))
 687                                 ra_list = list_first_entry(
 688                                         &list_head, struct mwifiex_ra_list_tbl,
 689                                         list);
 690                         else
 691                                 ra_list = NULL;
 692                         break;
 693                 }
 694         } else {
 695                 memcpy(ra, skb->data, ETH_ALEN);
 696                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 697                         memset(ra, 0xff, ETH_ALEN);
 698                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 699         }
 700
 701         if (!ra_list) {
 702                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 703                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 704                 return;
 705         }
 706
 707         skb_queue_tail(&ra_list->skb_head, skb);
 708
 709         ra_list->ba_pkt_count++;
 710         ra_list->total_pkt_count++;
 711
 712         if (atomic_read(&priv->wmm.highest_queued_prio) <
 713                                                 priv->tos_to_tid_inv[tid_down])
 714                 atomic_set(&priv->wmm.highest_queued_prio,
 715                            priv->tos_to_tid_inv[tid_down]);
 716
 717         atomic_inc(&priv->wmm.tx_pkts_queued);
 718
 719         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 720 }
 721
 722 /*
 723  * This function processes the get WMM status command response from firmware.
 724  *
 725  * The response may contain multiple TLVs -
 726  *      - AC Queue status TLVs
 727  *      - Current WMM Parameter IE TLV
 728  *      - Admission Control action frame TLVs
 729  *
 730  * This function parses the TLVs and then calls further specific functions
 731  * to process any changes in the queue prioritize or state.
 732  */
 733 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 734                                const struct host_cmd_ds_command *resp)
 735 {
 736         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 737         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 738         bool valid = true;
 739
 740         struct mwifiex_ie_types_data *tlv_hdr;
 741         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 742         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 743         struct mwifiex_wmm_ac_status *ac_status;
 744
 745         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 746                 resp_len);
 747
 748         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 749                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 750                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 751
 752                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 753                         break;
 754
 755                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 756                 case TLV_TYPE_WMMQSTATUS:
 757                         tlv_wmm_qstatus =
 758                                 (struct mwifiex_ie_types_wmm_queue_status *)
 759                                 tlv_hdr;
 760                         dev_dbg(priv->adapter->dev,
 761                                 "info: CMD_RESP: WMM_GET_STATUS:"
 762                                 " QSTATUS TLV: %d, %d, %d\n",
 763                                 tlv_wmm_qstatus->queue_index,
 764                                 tlv_wmm_qstatus->flow_required,
 765                                 tlv_wmm_qstatus->disabled);
 766
 767                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 768                                                          queue_index];
 769                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 770                         ac_status->flow_required =
 771                                                 tlv_wmm_qstatus->flow_required;
 772                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 773                         break;
 774
 775                 case WLAN_EID_VENDOR_SPECIFIC:
 776                         /*
 777                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 778                          *   and setup the IEEE IE type and length byte fields
 779                          */
 780
 781                         wmm_param_ie =
 782                                 (struct ieee_types_wmm_parameter *) (curr +
 783                                                                     2);
 784                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 785                         wmm_param_ie->vend_hdr.element_id =
 786                                                 WLAN_EID_VENDOR_SPECIFIC;
 787
 788                         dev_dbg(priv->adapter->dev,
 789                                 "info: CMD_RESP: WMM_GET_STATUS:"
 790                                 " WMM Parameter Set Count: %d\n",
 791                                 wmm_param_ie->qos_info_bitmap &
 792                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 793
 794                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 795                                wmm_ie, wmm_param_ie,
 796                                wmm_param_ie->vend_hdr.len + 2);
 797
 798                         break;
 799
 800                 default:
 801                         valid = false;
 802                         break;
 803                 }
 804
 805                 curr += (tlv_len + sizeof(tlv_hdr->header));
 806                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 807         }
 808
 809         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 810         mwifiex_wmm_setup_ac_downgrade(priv);
 811
 812         return 0;
 813 }
 814
 815 /*
 816  * Callback handler from the command module to allow insertion of a WMM TLV.
 817  *
 818  * If the BSS we are associating to supports WMM, this function adds the
 819  * required WMM Information IE to the association request command buffer in
 820  * the form of a Marvell extended IEEE IE.
 821  */
 822 u32
 823 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 824                                     u8 **assoc_buf,
 825                                     struct ieee_types_wmm_parameter *wmm_ie,
 826                                     struct ieee80211_ht_cap *ht_cap)
 827 {
 828         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 829         u32 ret_len = 0;
 830
 831         /* Null checks */
 832         if (!assoc_buf)
 833                 return 0;
 834         if (!(*assoc_buf))
 835                 return 0;
 836
 837         if (!wmm_ie)
 838                 return 0;
 839
 840         dev_dbg(priv->adapter->dev,
 841                 "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 842                 wmm_ie->vend_hdr.element_id);
 843
 844         if ((priv->wmm_required ||
 845              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 846              priv->adapter->config_bands & BAND_AN))) &&
 847             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 848                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 849                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 850                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 851                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 852                        le16_to_cpu(wmm_tlv->header.len));
 853                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 854                         memcpy((u8 *) (wmm_tlv->wmm_ie
 855                                        + le16_to_cpu(wmm_tlv->header.len)
 856                                        - sizeof(priv->wmm_qosinfo)),
 857                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 858
 859                 ret_len = sizeof(wmm_tlv->header)
 860                           + le16_to_cpu(wmm_tlv->header.len);
 861
 862                 *assoc_buf += ret_len;
 863         }
 864
 865         return ret_len;
 866 }
 867
 868 /*
 869  * This function computes the time delay in the driver queues for a
 870  * given packet.
 871  *
 872  * When the packet is received at the OS/Driver interface, the current
 873  * time is set in the packet structure. The difference between the present
 874  * time and that received time is computed in this function and limited
 875  * based on pre-compiled limits in the driver.
 876  */
 877 u8
 878 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 879                                   const struct sk_buff *skb)
 880 {
 881         u8 ret_val;
 882         struct timeval out_tstamp, in_tstamp;
 883         u32 queue_delay;
 884
 885         do_gettimeofday(&out_tstamp);
 886         in_tstamp = ktime_to_timeval(skb->tstamp);
 887
 888         queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
 889         queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;
 890
 891         /*
 892          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 893          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 894          *
 895          * Pass max value if queue_delay is beyond the uint8 range
 896          */
 897         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 898
 899         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 900                                 " %d ms sent to FW\n", queue_delay, ret_val);
 901
 902         return ret_val;
 903 }
 904
 905 /*
 906  * This function retrieves the highest priority RA list table pointer.
 907  */
 908 static struct mwifiex_ra_list_tbl *
 909 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 910                                      struct mwifiex_private **priv, int *tid)
 911 {
 912         struct mwifiex_private *priv_tmp;
 913         struct mwifiex_ra_list_tbl *ptr;
 914         struct mwifiex_tid_tbl *tid_ptr;
 915         atomic_t *hqp;
 916         unsigned long flags_bss, flags_ra;
 917         int i, j;
 918
 919         /* check the BSS with highest priority first */
 920         for (j = adapter->priv_num - 1; j >= 0; --j) {
 921                 spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 922                                   flags_bss);
 923
 924                 /* iterate over BSS with the equal priority */
 925                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 926                                     &adapter->bss_prio_tbl[j].bss_prio_head,
 927                                     list) {
 928
 929                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 930
 931                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 932                                 continue;
 933
 934                         /* iterate over the WMM queues of the BSS */
 935                         hqp = &priv_tmp->wmm.highest_queued_prio;
 936                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 937
 938                                 spin_lock_irqsave(&priv_tmp->wmm.
 939                                                   ra_list_spinlock, flags_ra);
 940
 941                                 tid_ptr = &(priv_tmp)->wmm.
 942                                         tid_tbl_ptr[tos_to_tid[i]];
 943
 944                                 /* iterate over receiver addresses */
 945                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
 946                                                     list) {
 947
 948                                         if (!skb_queue_empty(&ptr->skb_head))
 949                                                 /* holds both locks */
 950                                                 goto found;
 951                                 }
 952
 953                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 954                                                        ra_list_spinlock,
 955                                                        flags_ra);
 956                         }
 957                 }
 958
 959                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 960                                        flags_bss);
 961         }
 962
 963         return NULL;
 964
 965 found:
 966         /* holds bss_prio_lock / ra_list_spinlock */
 967         if (atomic_read(hqp) > i)
 968                 atomic_set(hqp, i);
 969         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 970         spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 971                                flags_bss);
 972
 973         *priv = priv_tmp;
 974         *tid = tos_to_tid[i];
 975
 976         return ptr;
 977 }
 978
 979 /* This functions rotates ra and bss lists so packets are picked round robin.
 980  *
 981  * After a packet is successfully transmitted, rotate the ra list, so the ra
 982  * next to the one transmitted, will come first in the list. This way we pick
 983  * the ra' in a round robin fashion. Same applies to bss nodes of equal
 984  * priority.
 985  *
 986  * Function also increments wmm.packets_out counter.
 987  */
 988 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
 989                                  struct mwifiex_ra_list_tbl *ra,
 990                                  int tid)
 991 {
 992         struct mwifiex_adapter *adapter = priv->adapter;
 993         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
 994         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
 995         unsigned long flags;
 996
 997         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
 998         /*
 999          * dirty trick: we remove 'head' temporarily and reinsert it after
1000          * curr bss node. imagine list to stay fixed while head is moved
1001          */
1002         list_move(&tbl[priv->bss_priority].bss_prio_head,
1003                   &tbl[priv->bss_priority].bss_prio_cur->list);
1004         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1005
1006         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1007         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1008                 priv->wmm.packets_out[tid]++;
1009                 /* same as above */
1010                 list_move(&tid_ptr->ra_list, &ra->list);
1011         }
1012         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1013 }
1014
1015 /*
1016  * This function checks if 11n aggregation is possible.
1017  */
1018 static int
1019 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1020                                     struct mwifiex_ra_list_tbl *ptr,
1021                                     int max_buf_size)
1022 {
1023         int count = 0, total_size = 0;
1024         struct sk_buff *skb, *tmp;
1025         int max_amsdu_size;
1026
1027         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1028             ptr->is_11n_enabled)
1029                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1030         else
1031                 max_amsdu_size = max_buf_size;
1032
1033         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1034                 total_size += skb->len;
1035                 if (total_size >= max_amsdu_size)
1036                         break;
1037                 if (++count >= MIN_NUM_AMSDU)
1038                         return true;
1039         }
1040
1041         return false;
1042 }
1043
1044 /*
1045  * This function sends a single packet to firmware for transmission.
1046  */
1047 static void
1048 mwifiex_send_single_packet(struct mwifiex_private *priv,
1049                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1050                            unsigned long ra_list_flags)
1051                            __releases(&priv->wmm.ra_list_spinlock)
1052 {
1053         struct sk_buff *skb, *skb_next;
1054         struct mwifiex_tx_param tx_param;
1055         struct mwifiex_adapter *adapter = priv->adapter;
1056         struct mwifiex_txinfo *tx_info;
1057
1058         if (skb_queue_empty(&ptr->skb_head)) {
1059                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1060                                        ra_list_flags);
1061                 dev_dbg(adapter->dev, "data: nothing to send\n");
1062                 return;
1063         }
1064
1065         skb = skb_dequeue(&ptr->skb_head);
1066
1067         tx_info = MWIFIEX_SKB_TXCB(skb);
1068         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1069
1070         ptr->total_pkt_count--;
1071
1072         if (!skb_queue_empty(&ptr->skb_head))
1073                 skb_next = skb_peek(&ptr->skb_head);
1074         else
1075                 skb_next = NULL;
1076
1077         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1078
1079         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1080                                 sizeof(struct txpd) : 0);
1081
1082         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1083                 /* Queue the packet back at the head */
1084                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1085
1086                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1087                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1088                                                ra_list_flags);
1089                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1090                         return;
1091                 }
1092
1093                 skb_queue_tail(&ptr->skb_head, skb);
1094
1095                 ptr->total_pkt_count++;
1096                 ptr->ba_pkt_count++;
1097                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1098                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1099                                        ra_list_flags);
1100         } else {
1101                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1102                 atomic_dec(&priv->wmm.tx_pkts_queued);
1103         }
1104 }
1105
1106 /*
1107  * This function checks if the first packet in the given RA list
1108  * is already processed or not.
1109  */
1110 static int
1111 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1112                          struct mwifiex_ra_list_tbl *ptr)
1113 {
1114         struct sk_buff *skb;
1115         struct mwifiex_txinfo *tx_info;
1116
1117         if (skb_queue_empty(&ptr->skb_head))
1118                 return false;
1119
1120         skb = skb_peek(&ptr->skb_head);
1121
1122         tx_info = MWIFIEX_SKB_TXCB(skb);
1123         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1124                 return true;
1125
1126         return false;
1127 }
1128
1129 /*
1130  * This function sends a single processed packet to firmware for
1131  * transmission.
1132  */
1133 static void
1134 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1135                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1136                               unsigned long ra_list_flags)
1137                                 __releases(&priv->wmm.ra_list_spinlock)
1138 {
1139         struct mwifiex_tx_param tx_param;
1140         struct mwifiex_adapter *adapter = priv->adapter;
1141         int ret = -1;
1142         struct sk_buff *skb, *skb_next;
1143         struct mwifiex_txinfo *tx_info;
1144
1145         if (skb_queue_empty(&ptr->skb_head)) {
1146                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1147                                        ra_list_flags);
1148                 return;
1149         }
1150
1151         skb = skb_dequeue(&ptr->skb_head);
1152
1153         if (!skb_queue_empty(&ptr->skb_head))
1154                 skb_next = skb_peek(&ptr->skb_head);
1155         else
1156                 skb_next = NULL;
1157
1158         tx_info = MWIFIEX_SKB_TXCB(skb);
1159
1160         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1161
1162         if (adapter->iface_type == MWIFIEX_USB) {
1163                 adapter->data_sent = true;
1164                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1165                                                    skb, NULL);
1166         } else {
1167                 tx_param.next_pkt_len =
1168                         ((skb_next) ? skb_next->len +
1169                          sizeof(struct txpd) : 0);
1170                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1171                                                    skb, &tx_param);
1172         }
1173
1174         switch (ret) {
1175         case -EBUSY:
1176                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1177                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1178
1179                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1180                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1181                                                ra_list_flags);
1182                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1183                         return;
1184                 }
1185
1186                 skb_queue_tail(&ptr->skb_head, skb);
1187
1188                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1189                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1190                                        ra_list_flags);
1191                 break;
1192         case -1:
1193                 if (adapter->iface_type != MWIFIEX_PCIE)
1194                         adapter->data_sent = false;
1195                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1196                 adapter->dbg.num_tx_host_to_card_failure++;
1197                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1198                 break;
1199         case -EINPROGRESS:
1200                 if (adapter->iface_type != MWIFIEX_PCIE)
1201                         adapter->data_sent = false;
1202         default:
1203                 break;
1204         }
1205         if (ret != -EBUSY) {
1206                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1207                 atomic_dec(&priv->wmm.tx_pkts_queued);
1208         }
1209 }
1210
1211 /*
1212  * This function dequeues a packet from the highest priority list
1213  * and transmits it.
1214  */
1215 static int
1216 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1217 {
1218         struct mwifiex_ra_list_tbl *ptr;
1219         struct mwifiex_private *priv = NULL;
1220         int ptr_index = 0;
1221         u8 ra[ETH_ALEN];
1222         int tid_del = 0, tid = 0;
1223         unsigned long flags;
1224
1225         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1226         if (!ptr)
1227                 return -1;
1228
1229         tid = mwifiex_get_tid(ptr);
1230
1231         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1232
1233         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1234         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1235                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1236                 return -1;
1237         }
1238
1239         if (mwifiex_is_ptr_processed(priv, ptr)) {
1240                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1241                 /* ra_list_spinlock has been freed in
1242                    mwifiex_send_processed_packet() */
1243                 return 0;
1244         }
1245
1246         if (!ptr->is_11n_enabled ||
1247             mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1248             priv->wps.session_enable) {
1249                 if (ptr->is_11n_enabled &&
1250                     mwifiex_is_ba_stream_setup(priv, ptr, tid) &&
1251                     mwifiex_is_amsdu_in_ampdu_allowed(priv, ptr, tid) &&
1252                     mwifiex_is_amsdu_allowed(priv, tid) &&
1253                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1254                                                         adapter->tx_buf_size))
1255                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1256                         /* ra_list_spinlock has been freed in
1257                          * mwifiex_11n_aggregate_pkt()
1258                          */
1259                 else
1260                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1261                         /* ra_list_spinlock has been freed in
1262                          * mwifiex_send_single_packet()
1263                          */
1264         } else {
1265                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1266                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1267                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1268                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1269                                                       BA_SETUP_INPROGRESS);
1270                                 mwifiex_send_addba(priv, tid, ptr->ra);
1271                         } else if (mwifiex_find_stream_to_delete
1272                                    (priv, tid, &tid_del, ra)) {
1273                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1274                                                       BA_SETUP_INPROGRESS);
1275                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1276                         }
1277                 }
1278                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1279                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1280                                                         adapter->tx_buf_size))
1281                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1282                         /* ra_list_spinlock has been freed in
1283                            mwifiex_11n_aggregate_pkt() */
1284                 else
1285                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1286                         /* ra_list_spinlock has been freed in
1287                            mwifiex_send_single_packet() */
1288         }
1289         return 0;
1290 }
1291
1292 /*
1293  * This function transmits the highest priority packet awaiting in the
1294  * WMM Queues.
1295  */
1296 void
1297 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1298 {
1299         do {
1300                 /* Check if busy */
1301                 if (adapter->data_sent || adapter->tx_lock_flag)
1302                         break;
1303
1304                 if (mwifiex_dequeue_tx_packet(adapter))
1305                         break;
1306         } while (!mwifiex_wmm_lists_empty(adapter));
1307 }