drivers/net/wireless/mwifiex/wmm.c

   1 /*
   2  * Marvell Wireless LAN device driver: WMM
   3  *
   4  * Copyright (C) 2011-2014, 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
 151         for (i = 0; i < MAX_NUM_TID; ++i) {
 152                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 153                 dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 154
 155                 if (!ra_list)
 156                         break;
 157
 158                 ra_list->is_11n_enabled = 0;
 159                 ra_list->tdls_link = false;
 160                 if (!mwifiex_queuing_ra_based(priv)) {
 161                         if (mwifiex_get_tdls_link_status(priv, ra) ==
 162                             TDLS_SETUP_COMPLETE) {
 163                                 ra_list->tdls_link = true;
 164                                 ra_list->is_11n_enabled =
 165                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 166                         } else {
 167                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 168                         }
 169                 } else {
 170                         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 171                         node = mwifiex_get_sta_entry(priv, ra);
 172                         ra_list->is_11n_enabled =
 173                                       mwifiex_is_sta_11n_enabled(priv, node);
 174                         if (ra_list->is_11n_enabled)
 175                                 ra_list->max_amsdu = node->max_amsdu;
 176                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 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 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 527 {
 528         pr_warn("Have pending ack frames!\n");
 529         kfree_skb(p);
 530         return 0;
 531 }
 532
 533 /*
 534  * This function cleans up the Tx and Rx queues.
 535  *
 536  * Cleanup includes -
 537  *      - All packets in RA lists
 538  *      - All entries in Rx reorder table
 539  *      - All entries in Tx BA stream table
 540  *      - MPA buffer (if required)
 541  *      - All RA lists
 542  */
 543 void
 544 mwifiex_clean_txrx(struct mwifiex_private *priv)
 545 {
 546         unsigned long flags;
 547         struct sk_buff *skb, *tmp;
 548
 549         mwifiex_11n_cleanup_reorder_tbl(priv);
 550         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 551
 552         mwifiex_wmm_cleanup_queues(priv);
 553         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 554
 555         if (priv->adapter->if_ops.cleanup_mpa_buf)
 556                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 557
 558         mwifiex_wmm_delete_all_ralist(priv);
 559         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 560
 561         if (priv->adapter->if_ops.clean_pcie_ring &&
 562             !priv->adapter->surprise_removed)
 563                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 564         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 565
 566         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 567                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 568
 569         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 570         idr_destroy(&priv->ack_status_frames);
 571 }
 572
 573 /*
 574  * This function retrieves a particular RA list node, matching with the
 575  * given TID and RA address.
 576  */
 577 static struct mwifiex_ra_list_tbl *
 578 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 579                             const u8 *ra_addr)
 580 {
 581         struct mwifiex_ra_list_tbl *ra_list;
 582
 583         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 584                             list) {
 585                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 586                         return ra_list;
 587         }
 588
 589         return NULL;
 590 }
 591
 592 /*
 593  * This function retrieves an RA list node for a given TID and
 594  * RA address pair.
 595  *
 596  * If no such node is found, a new node is added first and then
 597  * retrieved.
 598  */
 599 struct mwifiex_ra_list_tbl *
 600 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 601                             const u8 *ra_addr)
 602 {
 603         struct mwifiex_ra_list_tbl *ra_list;
 604
 605         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 606         if (ra_list)
 607                 return ra_list;
 608         mwifiex_ralist_add(priv, ra_addr);
 609
 610         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 611 }
 612
 613 /*
 614  * This function deletes RA list nodes for given mac for all TIDs.
 615  * Function also decrements TX pending count accordingly.
 616  */
 617 void
 618 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 619 {
 620         struct mwifiex_ra_list_tbl *ra_list;
 621         unsigned long flags;
 622         int i;
 623
 624         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 625
 626         for (i = 0; i < MAX_NUM_TID; ++i) {
 627                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 628
 629                 if (!ra_list)
 630                         continue;
 631                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 632                 atomic_sub(ra_list->total_pkt_count, &priv->wmm.tx_pkts_queued);
 633                 list_del(&ra_list->list);
 634                 kfree(ra_list);
 635         }
 636         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 637 }
 638
 639 /*
 640  * This function checks if a particular RA list node exists in a given TID
 641  * table index.
 642  */
 643 int
 644 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 645                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 646 {
 647         struct mwifiex_ra_list_tbl *rlist;
 648
 649         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 650                             list) {
 651                 if (rlist == ra_list)
 652                         return true;
 653         }
 654
 655         return false;
 656 }
 657
 658 /*
 659  * This function adds a packet to WMM queue.
 660  *
 661  * In disconnected state the packet is immediately dropped and the
 662  * packet send completion callback is called with status failure.
 663  *
 664  * Otherwise, the correct RA list node is located and the packet
 665  * is queued at the list tail.
 666  */
 667 void
 668 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 669                             struct sk_buff *skb)
 670 {
 671         struct mwifiex_adapter *adapter = priv->adapter;
 672         u32 tid;
 673         struct mwifiex_ra_list_tbl *ra_list;
 674         u8 ra[ETH_ALEN], tid_down;
 675         unsigned long flags;
 676         struct list_head list_head;
 677         int tdls_status = TDLS_NOT_SETUP;
 678         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 679         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 680
 681         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 682
 683         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 684             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 685                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 686                         dev_dbg(adapter->dev,
 687                                 "TDLS setup packet for %pM. Don't block\n", ra);
 688                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 689                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 690         }
 691
 692         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 693                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 694                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 695                 return;
 696         }
 697
 698         tid = skb->priority;
 699
 700         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 701
 702         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 703
 704         /* In case of infra as we have already created the list during
 705            association we just don't have to call get_queue_raptr, we will
 706            have only 1 raptr for a tid in case of infra */
 707         if (!mwifiex_queuing_ra_based(priv) &&
 708             !mwifiex_is_skb_mgmt_frame(skb)) {
 709                 switch (tdls_status) {
 710                 case TDLS_SETUP_COMPLETE:
 711                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 712                                                               ra);
 713                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 714                         break;
 715                 case TDLS_SETUP_INPROGRESS:
 716                         skb_queue_tail(&priv->tdls_txq, skb);
 717                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 718                                                flags);
 719                         return;
 720                 default:
 721                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 722                         if (!list_empty(&list_head))
 723                                 ra_list = list_first_entry(
 724                                         &list_head, struct mwifiex_ra_list_tbl,
 725                                         list);
 726                         else
 727                                 ra_list = NULL;
 728                         break;
 729                 }
 730         } else {
 731                 memcpy(ra, skb->data, ETH_ALEN);
 732                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 733                         memset(ra, 0xff, ETH_ALEN);
 734                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 735         }
 736
 737         if (!ra_list) {
 738                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 739                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 740                 return;
 741         }
 742
 743         skb_queue_tail(&ra_list->skb_head, skb);
 744
 745         ra_list->ba_pkt_count++;
 746         ra_list->total_pkt_count++;
 747
 748         if (atomic_read(&priv->wmm.highest_queued_prio) <
 749                                                 priv->tos_to_tid_inv[tid_down])
 750                 atomic_set(&priv->wmm.highest_queued_prio,
 751                            priv->tos_to_tid_inv[tid_down]);
 752
 753         atomic_inc(&priv->wmm.tx_pkts_queued);
 754
 755         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 756 }
 757
 758 /*
 759  * This function processes the get WMM status command response from firmware.
 760  *
 761  * The response may contain multiple TLVs -
 762  *      - AC Queue status TLVs
 763  *      - Current WMM Parameter IE TLV
 764  *      - Admission Control action frame TLVs
 765  *
 766  * This function parses the TLVs and then calls further specific functions
 767  * to process any changes in the queue prioritize or state.
 768  */
 769 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 770                                const struct host_cmd_ds_command *resp)
 771 {
 772         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 773         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 774         bool valid = true;
 775
 776         struct mwifiex_ie_types_data *tlv_hdr;
 777         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 778         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 779         struct mwifiex_wmm_ac_status *ac_status;
 780
 781         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 782                 resp_len);
 783
 784         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 785                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 786                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 787
 788                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 789                         break;
 790
 791                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 792                 case TLV_TYPE_WMMQSTATUS:
 793                         tlv_wmm_qstatus =
 794                                 (struct mwifiex_ie_types_wmm_queue_status *)
 795                                 tlv_hdr;
 796                         dev_dbg(priv->adapter->dev,
 797                                 "info: CMD_RESP: WMM_GET_STATUS:"
 798                                 " QSTATUS TLV: %d, %d, %d\n",
 799                                 tlv_wmm_qstatus->queue_index,
 800                                 tlv_wmm_qstatus->flow_required,
 801                                 tlv_wmm_qstatus->disabled);
 802
 803                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 804                                                          queue_index];
 805                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 806                         ac_status->flow_required =
 807                                                 tlv_wmm_qstatus->flow_required;
 808                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 809                         break;
 810
 811                 case WLAN_EID_VENDOR_SPECIFIC:
 812                         /*
 813                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 814                          *   and setup the IEEE IE type and length byte fields
 815                          */
 816
 817                         wmm_param_ie =
 818                                 (struct ieee_types_wmm_parameter *) (curr +
 819                                                                     2);
 820                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 821                         wmm_param_ie->vend_hdr.element_id =
 822                                                 WLAN_EID_VENDOR_SPECIFIC;
 823
 824                         dev_dbg(priv->adapter->dev,
 825                                 "info: CMD_RESP: WMM_GET_STATUS:"
 826                                 " WMM Parameter Set Count: %d\n",
 827                                 wmm_param_ie->qos_info_bitmap &
 828                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 829
 830                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 831                                wmm_ie, wmm_param_ie,
 832                                wmm_param_ie->vend_hdr.len + 2);
 833
 834                         break;
 835
 836                 default:
 837                         valid = false;
 838                         break;
 839                 }
 840
 841                 curr += (tlv_len + sizeof(tlv_hdr->header));
 842                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 843         }
 844
 845         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 846         mwifiex_wmm_setup_ac_downgrade(priv);
 847
 848         return 0;
 849 }
 850
 851 /*
 852  * Callback handler from the command module to allow insertion of a WMM TLV.
 853  *
 854  * If the BSS we are associating to supports WMM, this function adds the
 855  * required WMM Information IE to the association request command buffer in
 856  * the form of a Marvell extended IEEE IE.
 857  */
 858 u32
 859 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 860                                     u8 **assoc_buf,
 861                                     struct ieee_types_wmm_parameter *wmm_ie,
 862                                     struct ieee80211_ht_cap *ht_cap)
 863 {
 864         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 865         u32 ret_len = 0;
 866
 867         /* Null checks */
 868         if (!assoc_buf)
 869                 return 0;
 870         if (!(*assoc_buf))
 871                 return 0;
 872
 873         if (!wmm_ie)
 874                 return 0;
 875
 876         dev_dbg(priv->adapter->dev,
 877                 "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 878                 wmm_ie->vend_hdr.element_id);
 879
 880         if ((priv->wmm_required ||
 881              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 882              priv->adapter->config_bands & BAND_AN))) &&
 883             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 884                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 885                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 886                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 887                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 888                        le16_to_cpu(wmm_tlv->header.len));
 889                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 890                         memcpy((u8 *) (wmm_tlv->wmm_ie
 891                                        + le16_to_cpu(wmm_tlv->header.len)
 892                                        - sizeof(priv->wmm_qosinfo)),
 893                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 894
 895                 ret_len = sizeof(wmm_tlv->header)
 896                           + le16_to_cpu(wmm_tlv->header.len);
 897
 898                 *assoc_buf += ret_len;
 899         }
 900
 901         return ret_len;
 902 }
 903
 904 /*
 905  * This function computes the time delay in the driver queues for a
 906  * given packet.
 907  *
 908  * When the packet is received at the OS/Driver interface, the current
 909  * time is set in the packet structure. The difference between the present
 910  * time and that received time is computed in this function and limited
 911  * based on pre-compiled limits in the driver.
 912  */
 913 u8
 914 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 915                                   const struct sk_buff *skb)
 916 {
 917         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
 918         u8 ret_val;
 919
 920         /*
 921          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 922          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 923          *
 924          * Pass max value if queue_delay is beyond the uint8 range
 925          */
 926         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 927
 928         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 929                                 " %d ms sent to FW\n", queue_delay, ret_val);
 930
 931         return ret_val;
 932 }
 933
 934 /*
 935  * This function retrieves the highest priority RA list table pointer.
 936  */
 937 static struct mwifiex_ra_list_tbl *
 938 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 939                                      struct mwifiex_private **priv, int *tid)
 940 {
 941         struct mwifiex_private *priv_tmp;
 942         struct mwifiex_ra_list_tbl *ptr;
 943         struct mwifiex_tid_tbl *tid_ptr;
 944         atomic_t *hqp;
 945         unsigned long flags_bss, flags_ra;
 946         int i, j;
 947
 948         /* check the BSS with highest priority first */
 949         for (j = adapter->priv_num - 1; j >= 0; --j) {
 950                 spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 951                                   flags_bss);
 952
 953                 /* iterate over BSS with the equal priority */
 954                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 955                                     &adapter->bss_prio_tbl[j].bss_prio_head,
 956                                     list) {
 957
 958                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 959
 960                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 961                                 continue;
 962
 963                         /* iterate over the WMM queues of the BSS */
 964                         hqp = &priv_tmp->wmm.highest_queued_prio;
 965                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 966
 967                                 spin_lock_irqsave(&priv_tmp->wmm.
 968                                                   ra_list_spinlock, flags_ra);
 969
 970                                 tid_ptr = &(priv_tmp)->wmm.
 971                                         tid_tbl_ptr[tos_to_tid[i]];
 972
 973                                 /* iterate over receiver addresses */
 974                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
 975                                                     list) {
 976
 977                                         if (!skb_queue_empty(&ptr->skb_head))
 978                                                 /* holds both locks */
 979                                                 goto found;
 980                                 }
 981
 982                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 983                                                        ra_list_spinlock,
 984                                                        flags_ra);
 985                         }
 986                 }
 987
 988                 spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 989                                        flags_bss);
 990         }
 991
 992         return NULL;
 993
 994 found:
 995         /* holds bss_prio_lock / ra_list_spinlock */
 996         if (atomic_read(hqp) > i)
 997                 atomic_set(hqp, i);
 998         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 999         spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
1000                                flags_bss);
1001
1002         *priv = priv_tmp;
1003         *tid = tos_to_tid[i];
1004
1005         return ptr;
1006 }
1007
1008 /* This functions rotates ra and bss lists so packets are picked round robin.
1009  *
1010  * After a packet is successfully transmitted, rotate the ra list, so the ra
1011  * next to the one transmitted, will come first in the list. This way we pick
1012  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1013  * priority.
1014  *
1015  * Function also increments wmm.packets_out counter.
1016  */
1017 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1018                                  struct mwifiex_ra_list_tbl *ra,
1019                                  int tid)
1020 {
1021         struct mwifiex_adapter *adapter = priv->adapter;
1022         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1023         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1024         unsigned long flags;
1025
1026         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1027         /*
1028          * dirty trick: we remove 'head' temporarily and reinsert it after
1029          * curr bss node. imagine list to stay fixed while head is moved
1030          */
1031         list_move(&tbl[priv->bss_priority].bss_prio_head,
1032                   &tbl[priv->bss_priority].bss_prio_cur->list);
1033         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1034
1035         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1036         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1037                 priv->wmm.packets_out[tid]++;
1038                 /* same as above */
1039                 list_move(&tid_ptr->ra_list, &ra->list);
1040         }
1041         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1042 }
1043
1044 /*
1045  * This function checks if 11n aggregation is possible.
1046  */
1047 static int
1048 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1049                                     struct mwifiex_ra_list_tbl *ptr,
1050                                     int max_buf_size)
1051 {
1052         int count = 0, total_size = 0;
1053         struct sk_buff *skb, *tmp;
1054         int max_amsdu_size;
1055
1056         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1057             ptr->is_11n_enabled)
1058                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1059         else
1060                 max_amsdu_size = max_buf_size;
1061
1062         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1063                 total_size += skb->len;
1064                 if (total_size >= max_amsdu_size)
1065                         break;
1066                 if (++count >= MIN_NUM_AMSDU)
1067                         return true;
1068         }
1069
1070         return false;
1071 }
1072
1073 /*
1074  * This function sends a single packet to firmware for transmission.
1075  */
1076 static void
1077 mwifiex_send_single_packet(struct mwifiex_private *priv,
1078                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1079                            unsigned long ra_list_flags)
1080                            __releases(&priv->wmm.ra_list_spinlock)
1081 {
1082         struct sk_buff *skb, *skb_next;
1083         struct mwifiex_tx_param tx_param;
1084         struct mwifiex_adapter *adapter = priv->adapter;
1085         struct mwifiex_txinfo *tx_info;
1086
1087         if (skb_queue_empty(&ptr->skb_head)) {
1088                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1089                                        ra_list_flags);
1090                 dev_dbg(adapter->dev, "data: nothing to send\n");
1091                 return;
1092         }
1093
1094         skb = skb_dequeue(&ptr->skb_head);
1095
1096         tx_info = MWIFIEX_SKB_TXCB(skb);
1097         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1098
1099         ptr->total_pkt_count--;
1100
1101         if (!skb_queue_empty(&ptr->skb_head))
1102                 skb_next = skb_peek(&ptr->skb_head);
1103         else
1104                 skb_next = NULL;
1105
1106         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1107
1108         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1109                                 sizeof(struct txpd) : 0);
1110
1111         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1112                 /* Queue the packet back at the head */
1113                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1114
1115                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1116                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1117                                                ra_list_flags);
1118                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1119                         return;
1120                 }
1121
1122                 skb_queue_tail(&ptr->skb_head, skb);
1123
1124                 ptr->total_pkt_count++;
1125                 ptr->ba_pkt_count++;
1126                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1127                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1128                                        ra_list_flags);
1129         } else {
1130                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1131                 atomic_dec(&priv->wmm.tx_pkts_queued);
1132         }
1133 }
1134
1135 /*
1136  * This function checks if the first packet in the given RA list
1137  * is already processed or not.
1138  */
1139 static int
1140 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1141                          struct mwifiex_ra_list_tbl *ptr)
1142 {
1143         struct sk_buff *skb;
1144         struct mwifiex_txinfo *tx_info;
1145
1146         if (skb_queue_empty(&ptr->skb_head))
1147                 return false;
1148
1149         skb = skb_peek(&ptr->skb_head);
1150
1151         tx_info = MWIFIEX_SKB_TXCB(skb);
1152         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1153                 return true;
1154
1155         return false;
1156 }
1157
1158 /*
1159  * This function sends a single processed packet to firmware for
1160  * transmission.
1161  */
1162 static void
1163 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1164                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1165                               unsigned long ra_list_flags)
1166                                 __releases(&priv->wmm.ra_list_spinlock)
1167 {
1168         struct mwifiex_tx_param tx_param;
1169         struct mwifiex_adapter *adapter = priv->adapter;
1170         int ret = -1;
1171         struct sk_buff *skb, *skb_next;
1172         struct mwifiex_txinfo *tx_info;
1173
1174         if (skb_queue_empty(&ptr->skb_head)) {
1175                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1176                                        ra_list_flags);
1177                 return;
1178         }
1179
1180         skb = skb_dequeue(&ptr->skb_head);
1181
1182         if (!skb_queue_empty(&ptr->skb_head))
1183                 skb_next = skb_peek(&ptr->skb_head);
1184         else
1185                 skb_next = NULL;
1186
1187         tx_info = MWIFIEX_SKB_TXCB(skb);
1188
1189         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1190
1191         if (adapter->iface_type == MWIFIEX_USB) {
1192                 adapter->data_sent = true;
1193                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1194                                                    skb, NULL);
1195         } else {
1196                 tx_param.next_pkt_len =
1197                         ((skb_next) ? skb_next->len +
1198                          sizeof(struct txpd) : 0);
1199                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1200                                                    skb, &tx_param);
1201         }
1202
1203         switch (ret) {
1204         case -EBUSY:
1205                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1206                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1207
1208                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1209                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1210                                                ra_list_flags);
1211                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1212                         return;
1213                 }
1214
1215                 skb_queue_tail(&ptr->skb_head, skb);
1216
1217                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1218                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1219                                        ra_list_flags);
1220                 break;
1221         case -1:
1222                 if (adapter->iface_type != MWIFIEX_PCIE)
1223                         adapter->data_sent = false;
1224                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1225                 adapter->dbg.num_tx_host_to_card_failure++;
1226                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1227                 break;
1228         case -EINPROGRESS:
1229                 if (adapter->iface_type != MWIFIEX_PCIE)
1230                         adapter->data_sent = false;
1231         default:
1232                 break;
1233         }
1234         if (ret != -EBUSY) {
1235                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1236                 atomic_dec(&priv->wmm.tx_pkts_queued);
1237         }
1238 }
1239
1240 /*
1241  * This function dequeues a packet from the highest priority list
1242  * and transmits it.
1243  */
1244 static int
1245 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1246 {
1247         struct mwifiex_ra_list_tbl *ptr;
1248         struct mwifiex_private *priv = NULL;
1249         int ptr_index = 0;
1250         u8 ra[ETH_ALEN];
1251         int tid_del = 0, tid = 0;
1252         unsigned long flags;
1253
1254         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1255         if (!ptr)
1256                 return -1;
1257
1258         tid = mwifiex_get_tid(ptr);
1259
1260         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1261
1262         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1263         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1264                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1265                 return -1;
1266         }
1267
1268         if (mwifiex_is_ptr_processed(priv, ptr)) {
1269                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1270                 /* ra_list_spinlock has been freed in
1271                    mwifiex_send_processed_packet() */
1272                 return 0;
1273         }
1274
1275         if (!ptr->is_11n_enabled ||
1276             mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1277             priv->wps.session_enable) {
1278                 if (ptr->is_11n_enabled &&
1279                     mwifiex_is_ba_stream_setup(priv, ptr, tid) &&
1280                     mwifiex_is_amsdu_in_ampdu_allowed(priv, ptr, tid) &&
1281                     mwifiex_is_amsdu_allowed(priv, tid) &&
1282                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1283                                                         adapter->tx_buf_size))
1284                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1285                         /* ra_list_spinlock has been freed in
1286                          * mwifiex_11n_aggregate_pkt()
1287                          */
1288                 else
1289                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1290                         /* ra_list_spinlock has been freed in
1291                          * mwifiex_send_single_packet()
1292                          */
1293         } else {
1294                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1295                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1296                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1297                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1298                                                       BA_SETUP_INPROGRESS);
1299                                 mwifiex_send_addba(priv, tid, ptr->ra);
1300                         } else if (mwifiex_find_stream_to_delete
1301                                    (priv, tid, &tid_del, ra)) {
1302                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1303                                                       BA_SETUP_INPROGRESS);
1304                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1305                         }
1306                 }
1307                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1308                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1309                                                         adapter->tx_buf_size))
1310                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1311                         /* ra_list_spinlock has been freed in
1312                            mwifiex_11n_aggregate_pkt() */
1313                 else
1314                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1315                         /* ra_list_spinlock has been freed in
1316                            mwifiex_send_single_packet() */
1317         }
1318         return 0;
1319 }
1320
1321 /*
1322  * This function transmits the highest priority packet awaiting in the
1323  * WMM Queues.
1324  */
1325 void
1326 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1327 {
1328         do {
1329                 /* Check if busy */
1330                 if (adapter->data_sent || adapter->tx_lock_flag)
1331                         break;
1332
1333                 if (mwifiex_dequeue_tx_packet(adapter))
1334                         break;
1335         } while (!mwifiex_wmm_lists_empty(adapter));
1336 }