kernel/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                 ra_list->ba_status = BA_SETUP_NONE;
 161                 ra_list->amsdu_in_ampdu = false;
 162                 if (!mwifiex_queuing_ra_based(priv)) {
 163                         if (mwifiex_get_tdls_link_status(priv, ra) ==
 164                             TDLS_SETUP_COMPLETE) {
 165                                 ra_list->tdls_link = true;
 166                                 ra_list->is_11n_enabled =
 167                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 168                         } else {
 169                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 170                         }
 171                 } else {
 172                         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 173                         node = mwifiex_get_sta_entry(priv, ra);
 174                         ra_list->is_11n_enabled =
 175                                       mwifiex_is_sta_11n_enabled(priv, node);
 176                         if (ra_list->is_11n_enabled)
 177                                 ra_list->max_amsdu = node->max_amsdu;
 178                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 179                 }
 180
 181                 dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 182                         ra_list, ra_list->is_11n_enabled);
 183
 184                 if (ra_list->is_11n_enabled) {
 185                         ra_list->ba_pkt_count = 0;
 186                         ra_list->ba_packet_thr =
 187                                               mwifiex_get_random_ba_threshold();
 188                 }
 189                 list_add_tail(&ra_list->list,
 190                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 191         }
 192 }
 193
 194 /*
 195  * This function sets the WMM queue priorities to their default values.
 196  */
 197 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 198 {
 199         /* Default queue priorities: VO->VI->BE->BK */
 200         priv->wmm.queue_priority[0] = WMM_AC_VO;
 201         priv->wmm.queue_priority[1] = WMM_AC_VI;
 202         priv->wmm.queue_priority[2] = WMM_AC_BE;
 203         priv->wmm.queue_priority[3] = WMM_AC_BK;
 204 }
 205
 206 /*
 207  * This function map ACs to TIDs.
 208  */
 209 static void
 210 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
 211 {
 212         struct mwifiex_wmm_desc *wmm = &priv->wmm;
 213         u8 *queue_priority = wmm->queue_priority;
 214         int i;
 215
 216         for (i = 0; i < 4; ++i) {
 217                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 218                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 219         }
 220
 221         for (i = 0; i < MAX_NUM_TID; ++i)
 222                 priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 223
 224         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 225 }
 226
 227 /*
 228  * This function initializes WMM priority queues.
 229  */
 230 void
 231 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 232                                    struct ieee_types_wmm_parameter *wmm_ie)
 233 {
 234         u16 cw_min, avg_back_off, tmp[4];
 235         u32 i, j, num_ac;
 236         u8 ac_idx;
 237
 238         if (!wmm_ie || !priv->wmm_enabled) {
 239                 /* WMM is not enabled, just set the defaults and return */
 240                 mwifiex_wmm_default_queue_priorities(priv);
 241                 return;
 242         }
 243
 244         dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
 245                 "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 246                 wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 247                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 248                 wmm_ie->reserved);
 249
 250         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 251                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 252                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 253                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 254                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 255
 256                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 257                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 258                 tmp[ac_idx] = avg_back_off;
 259
 260                 dev_dbg(priv->adapter->dev,
 261                         "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 262                         (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 263                         cw_min, avg_back_off);
 264                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 265         }
 266
 267         /* Bubble sort */
 268         for (i = 0; i < num_ac; i++) {
 269                 for (j = 1; j < num_ac - i; j++) {
 270                         if (tmp[j - 1] > tmp[j]) {
 271                                 swap(tmp[j - 1], tmp[j]);
 272                                 swap(priv->wmm.queue_priority[j - 1],
 273                                      priv->wmm.queue_priority[j]);
 274                         } else if (tmp[j - 1] == tmp[j]) {
 275                                 if (priv->wmm.queue_priority[j - 1]
 276                                     < priv->wmm.queue_priority[j])
 277                                         swap(priv->wmm.queue_priority[j - 1],
 278                                              priv->wmm.queue_priority[j]);
 279                         }
 280                 }
 281         }
 282
 283         mwifiex_wmm_queue_priorities_tid(priv);
 284 }
 285
 286 /*
 287  * This function evaluates whether or not an AC is to be downgraded.
 288  *
 289  * In case the AC is not enabled, the highest AC is returned that is
 290  * enabled and does not require admission control.
 291  */
 292 static enum mwifiex_wmm_ac_e
 293 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 294                               enum mwifiex_wmm_ac_e eval_ac)
 295 {
 296         int down_ac;
 297         enum mwifiex_wmm_ac_e ret_ac;
 298         struct mwifiex_wmm_ac_status *ac_status;
 299
 300         ac_status = &priv->wmm.ac_status[eval_ac];
 301
 302         if (!ac_status->disabled)
 303                 /* Okay to use this AC, its enabled */
 304                 return eval_ac;
 305
 306         /* Setup a default return value of the lowest priority */
 307         ret_ac = WMM_AC_BK;
 308
 309         /*
 310          *  Find the highest AC that is enabled and does not require
 311          *  admission control. The spec disallows downgrading to an AC,
 312          *  which is enabled due to a completed admission control.
 313          *  Unadmitted traffic is not to be sent on an AC with admitted
 314          *  traffic.
 315          */
 316         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 317                 ac_status = &priv->wmm.ac_status[down_ac];
 318
 319                 if (!ac_status->disabled && !ac_status->flow_required)
 320                         /* AC is enabled and does not require admission
 321                            control */
 322                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 323         }
 324
 325         return ret_ac;
 326 }
 327
 328 /*
 329  * This function downgrades WMM priority queue.
 330  */
 331 void
 332 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 333 {
 334         int ac_val;
 335
 336         dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
 337                         "BK(0), BE(1), VI(2), VO(3)\n");
 338
 339         if (!priv->wmm_enabled) {
 340                 /* WMM is not enabled, default priorities */
 341                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 342                         priv->wmm.ac_down_graded_vals[ac_val] =
 343                                                 (enum mwifiex_wmm_ac_e) ac_val;
 344         } else {
 345                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 346                         priv->wmm.ac_down_graded_vals[ac_val]
 347                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 348                                                 (enum mwifiex_wmm_ac_e) ac_val);
 349                         dev_dbg(priv->adapter->dev,
 350                                 "info: WMM: AC PRIO %d maps to %d\n",
 351                                 ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
 352                 }
 353         }
 354 }
 355
 356 /*
 357  * This function converts the IP TOS field to an WMM AC
 358  * Queue assignment.
 359  */
 360 static enum mwifiex_wmm_ac_e
 361 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 362 {
 363         /* Map of TOS UP values to WMM AC */
 364         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 365                 WMM_AC_BK,
 366                 WMM_AC_BK,
 367                 WMM_AC_BE,
 368                 WMM_AC_VI,
 369                 WMM_AC_VI,
 370                 WMM_AC_VO,
 371                 WMM_AC_VO
 372         };
 373
 374         if (tos >= ARRAY_SIZE(tos_to_ac))
 375                 return WMM_AC_BE;
 376
 377         return tos_to_ac[tos];
 378 }
 379
 380 /*
 381  * This function evaluates a given TID and downgrades it to a lower
 382  * TID if the WMM Parameter IE received from the AP indicates that the
 383  * AP is disabled (due to call admission control (ACM bit). Mapping
 384  * of TID to AC is taken care of internally.
 385  */
 386 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 387 {
 388         enum mwifiex_wmm_ac_e ac, ac_down;
 389         u8 new_tid;
 390
 391         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 392         ac_down = priv->wmm.ac_down_graded_vals[ac];
 393
 394         /* Send the index to tid array, picking from the array will be
 395          * taken care by dequeuing function
 396          */
 397         new_tid = ac_to_tid[ac_down][tid % 2];
 398
 399         return new_tid;
 400 }
 401
 402 /*
 403  * This function initializes the WMM state information and the
 404  * WMM data path queues.
 405  */
 406 void
 407 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 408 {
 409         int i, j;
 410         struct mwifiex_private *priv;
 411
 412         for (j = 0; j < adapter->priv_num; ++j) {
 413                 priv = adapter->priv[j];
 414                 if (!priv)
 415                         continue;
 416
 417                 for (i = 0; i < MAX_NUM_TID; ++i) {
 418                         if (!disable_tx_amsdu &&
 419                             adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
 420                                 priv->aggr_prio_tbl[i].amsdu =
 421                                                         priv->tos_to_tid_inv[i];
 422                         else
 423                                 priv->aggr_prio_tbl[i].amsdu =
 424                                                         BA_STREAM_NOT_ALLOWED;
 425                         priv->aggr_prio_tbl[i].ampdu_ap =
 426                                                         priv->tos_to_tid_inv[i];
 427                         priv->aggr_prio_tbl[i].ampdu_user =
 428                                                         priv->tos_to_tid_inv[i];
 429                 }
 430
 431                 mwifiex_set_ba_params(priv);
 432                 mwifiex_reset_11n_rx_seq_num(priv);
 433
 434                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 435                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 436         }
 437 }
 438
 439 /*
 440  * This function checks if WMM Tx queue is empty.
 441  */
 442 int
 443 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 444 {
 445         int i;
 446         struct mwifiex_private *priv;
 447
 448         for (i = 0; i < adapter->priv_num; ++i) {
 449                 priv = adapter->priv[i];
 450                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 451                         return false;
 452         }
 453
 454         return true;
 455 }
 456
 457 /*
 458  * This function deletes all packets in an RA list node.
 459  *
 460  * The packet sent completion callback handler are called with
 461  * status failure, after they are dequeued to ensure proper
 462  * cleanup. The RA list node itself is freed at the end.
 463  */
 464 static void
 465 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 466                                     struct mwifiex_ra_list_tbl *ra_list)
 467 {
 468         struct mwifiex_adapter *adapter = priv->adapter;
 469         struct sk_buff *skb, *tmp;
 470
 471         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 472                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 473 }
 474
 475 /*
 476  * This function deletes all packets in an RA list.
 477  *
 478  * Each nodes in the RA list are freed individually first, and then
 479  * the RA list itself is freed.
 480  */
 481 static void
 482 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 483                                struct list_head *ra_list_head)
 484 {
 485         struct mwifiex_ra_list_tbl *ra_list;
 486
 487         list_for_each_entry(ra_list, ra_list_head, list)
 488                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 489 }
 490
 491 /*
 492  * This function deletes all packets in all RA lists.
 493  */
 494 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 495 {
 496         int i;
 497
 498         for (i = 0; i < MAX_NUM_TID; i++)
 499                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 500                                                                        ra_list);
 501
 502         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 503         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 504 }
 505
 506 /*
 507  * This function deletes all route addresses from all RA lists.
 508  */
 509 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 510 {
 511         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 512         int i;
 513
 514         for (i = 0; i < MAX_NUM_TID; ++i) {
 515                 dev_dbg(priv->adapter->dev,
 516                         "info: ra_list: freeing buf for tid %d\n", i);
 517                 list_for_each_entry_safe(ra_list, tmp_node,
 518                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 519                                          list) {
 520                         list_del(&ra_list->list);
 521                         kfree(ra_list);
 522                 }
 523
 524                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 525         }
 526 }
 527
 528 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 529 {
 530         pr_warn("Have pending ack frames!\n");
 531         kfree_skb(p);
 532         return 0;
 533 }
 534
 535 /*
 536  * This function cleans up the Tx and Rx queues.
 537  *
 538  * Cleanup includes -
 539  *      - All packets in RA lists
 540  *      - All entries in Rx reorder table
 541  *      - All entries in Tx BA stream table
 542  *      - MPA buffer (if required)
 543  *      - All RA lists
 544  */
 545 void
 546 mwifiex_clean_txrx(struct mwifiex_private *priv)
 547 {
 548         unsigned long flags;
 549         struct sk_buff *skb, *tmp;
 550
 551         mwifiex_11n_cleanup_reorder_tbl(priv);
 552         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 553
 554         mwifiex_wmm_cleanup_queues(priv);
 555         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 556
 557         if (priv->adapter->if_ops.cleanup_mpa_buf)
 558                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 559
 560         mwifiex_wmm_delete_all_ralist(priv);
 561         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 562
 563         if (priv->adapter->if_ops.clean_pcie_ring &&
 564             !priv->adapter->surprise_removed)
 565                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 566         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 567
 568         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 569                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 570
 571         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 572         idr_destroy(&priv->ack_status_frames);
 573 }
 574
 575 /*
 576  * This function retrieves a particular RA list node, matching with the
 577  * given TID and RA address.
 578  */
 579 struct mwifiex_ra_list_tbl *
 580 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 581                             const u8 *ra_addr)
 582 {
 583         struct mwifiex_ra_list_tbl *ra_list;
 584
 585         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 586                             list) {
 587                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 588                         return ra_list;
 589         }
 590
 591         return NULL;
 592 }
 593
 594 /*
 595  * This function retrieves an RA list node for a given TID and
 596  * RA address pair.
 597  *
 598  * If no such node is found, a new node is added first and then
 599  * retrieved.
 600  */
 601 struct mwifiex_ra_list_tbl *
 602 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 603                             const u8 *ra_addr)
 604 {
 605         struct mwifiex_ra_list_tbl *ra_list;
 606
 607         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 608         if (ra_list)
 609                 return ra_list;
 610         mwifiex_ralist_add(priv, ra_addr);
 611
 612         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 613 }
 614
 615 /*
 616  * This function deletes RA list nodes for given mac for all TIDs.
 617  * Function also decrements TX pending count accordingly.
 618  */
 619 void
 620 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 621 {
 622         struct mwifiex_ra_list_tbl *ra_list;
 623         unsigned long flags;
 624         int i;
 625
 626         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 627
 628         for (i = 0; i < MAX_NUM_TID; ++i) {
 629                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 630
 631                 if (!ra_list)
 632                         continue;
 633                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 634                 atomic_sub(ra_list->total_pkt_count, &priv->wmm.tx_pkts_queued);
 635                 list_del(&ra_list->list);
 636                 kfree(ra_list);
 637         }
 638         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 639 }
 640
 641 /*
 642  * This function checks if a particular RA list node exists in a given TID
 643  * table index.
 644  */
 645 int
 646 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 647                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 648 {
 649         struct mwifiex_ra_list_tbl *rlist;
 650
 651         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 652                             list) {
 653                 if (rlist == ra_list)
 654                         return true;
 655         }
 656
 657         return false;
 658 }
 659
 660 /*
 661  * This function adds a packet to WMM queue.
 662  *
 663  * In disconnected state the packet is immediately dropped and the
 664  * packet send completion callback is called with status failure.
 665  *
 666  * Otherwise, the correct RA list node is located and the packet
 667  * is queued at the list tail.
 668  */
 669 void
 670 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 671                             struct sk_buff *skb)
 672 {
 673         struct mwifiex_adapter *adapter = priv->adapter;
 674         u32 tid;
 675         struct mwifiex_ra_list_tbl *ra_list;
 676         u8 ra[ETH_ALEN], tid_down;
 677         unsigned long flags;
 678         struct list_head list_head;
 679         int tdls_status = TDLS_NOT_SETUP;
 680         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 681         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 682
 683         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 684
 685         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 686             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 687                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 688                         dev_dbg(adapter->dev,
 689                                 "TDLS setup packet for %pM. Don't block\n", ra);
 690                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 691                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 692         }
 693
 694         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 695                 dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 696                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 697                 return;
 698         }
 699
 700         tid = skb->priority;
 701
 702         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 703
 704         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 705
 706         /* In case of infra as we have already created the list during
 707            association we just don't have to call get_queue_raptr, we will
 708            have only 1 raptr for a tid in case of infra */
 709         if (!mwifiex_queuing_ra_based(priv) &&
 710             !mwifiex_is_skb_mgmt_frame(skb)) {
 711                 switch (tdls_status) {
 712                 case TDLS_SETUP_COMPLETE:
 713                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 714                                                               ra);
 715                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 716                         break;
 717                 case TDLS_SETUP_INPROGRESS:
 718                         skb_queue_tail(&priv->tdls_txq, skb);
 719                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 720                                                flags);
 721                         return;
 722                 default:
 723                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 724                         if (!list_empty(&list_head))
 725                                 ra_list = list_first_entry(
 726                                         &list_head, struct mwifiex_ra_list_tbl,
 727                                         list);
 728                         else
 729                                 ra_list = NULL;
 730                         break;
 731                 }
 732         } else {
 733                 memcpy(ra, skb->data, ETH_ALEN);
 734                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 735                         eth_broadcast_addr(ra);
 736                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 737         }
 738
 739         if (!ra_list) {
 740                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 741                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 742                 return;
 743         }
 744
 745         skb_queue_tail(&ra_list->skb_head, skb);
 746
 747         ra_list->ba_pkt_count++;
 748         ra_list->total_pkt_count++;
 749
 750         if (atomic_read(&priv->wmm.highest_queued_prio) <
 751                                                 priv->tos_to_tid_inv[tid_down])
 752                 atomic_set(&priv->wmm.highest_queued_prio,
 753                            priv->tos_to_tid_inv[tid_down]);
 754
 755         atomic_inc(&priv->wmm.tx_pkts_queued);
 756
 757         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 758 }
 759
 760 /*
 761  * This function processes the get WMM status command response from firmware.
 762  *
 763  * The response may contain multiple TLVs -
 764  *      - AC Queue status TLVs
 765  *      - Current WMM Parameter IE TLV
 766  *      - Admission Control action frame TLVs
 767  *
 768  * This function parses the TLVs and then calls further specific functions
 769  * to process any changes in the queue prioritize or state.
 770  */
 771 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 772                                const struct host_cmd_ds_command *resp)
 773 {
 774         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 775         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 776         bool valid = true;
 777
 778         struct mwifiex_ie_types_data *tlv_hdr;
 779         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 780         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 781         struct mwifiex_wmm_ac_status *ac_status;
 782
 783         dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 784                 resp_len);
 785
 786         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 787                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 788                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 789
 790                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 791                         break;
 792
 793                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 794                 case TLV_TYPE_WMMQSTATUS:
 795                         tlv_wmm_qstatus =
 796                                 (struct mwifiex_ie_types_wmm_queue_status *)
 797                                 tlv_hdr;
 798                         dev_dbg(priv->adapter->dev,
 799                                 "info: CMD_RESP: WMM_GET_STATUS:"
 800                                 " QSTATUS TLV: %d, %d, %d\n",
 801                                 tlv_wmm_qstatus->queue_index,
 802                                 tlv_wmm_qstatus->flow_required,
 803                                 tlv_wmm_qstatus->disabled);
 804
 805                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 806                                                          queue_index];
 807                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 808                         ac_status->flow_required =
 809                                                 tlv_wmm_qstatus->flow_required;
 810                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 811                         break;
 812
 813                 case WLAN_EID_VENDOR_SPECIFIC:
 814                         /*
 815                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 816                          *   and setup the IEEE IE type and length byte fields
 817                          */
 818
 819                         wmm_param_ie =
 820                                 (struct ieee_types_wmm_parameter *) (curr +
 821                                                                     2);
 822                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 823                         wmm_param_ie->vend_hdr.element_id =
 824                                                 WLAN_EID_VENDOR_SPECIFIC;
 825
 826                         dev_dbg(priv->adapter->dev,
 827                                 "info: CMD_RESP: WMM_GET_STATUS:"
 828                                 " WMM Parameter Set Count: %d\n",
 829                                 wmm_param_ie->qos_info_bitmap &
 830                                 IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 831
 832                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 833                                wmm_ie, wmm_param_ie,
 834                                wmm_param_ie->vend_hdr.len + 2);
 835
 836                         break;
 837
 838                 default:
 839                         valid = false;
 840                         break;
 841                 }
 842
 843                 curr += (tlv_len + sizeof(tlv_hdr->header));
 844                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 845         }
 846
 847         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 848         mwifiex_wmm_setup_ac_downgrade(priv);
 849
 850         return 0;
 851 }
 852
 853 /*
 854  * Callback handler from the command module to allow insertion of a WMM TLV.
 855  *
 856  * If the BSS we are associating to supports WMM, this function adds the
 857  * required WMM Information IE to the association request command buffer in
 858  * the form of a Marvell extended IEEE IE.
 859  */
 860 u32
 861 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 862                                     u8 **assoc_buf,
 863                                     struct ieee_types_wmm_parameter *wmm_ie,
 864                                     struct ieee80211_ht_cap *ht_cap)
 865 {
 866         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 867         u32 ret_len = 0;
 868
 869         /* Null checks */
 870         if (!assoc_buf)
 871                 return 0;
 872         if (!(*assoc_buf))
 873                 return 0;
 874
 875         if (!wmm_ie)
 876                 return 0;
 877
 878         dev_dbg(priv->adapter->dev,
 879                 "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 880                 wmm_ie->vend_hdr.element_id);
 881
 882         if ((priv->wmm_required ||
 883              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 884              priv->adapter->config_bands & BAND_AN))) &&
 885             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 886                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 887                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 888                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 889                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 890                        le16_to_cpu(wmm_tlv->header.len));
 891                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 892                         memcpy((u8 *) (wmm_tlv->wmm_ie
 893                                        + le16_to_cpu(wmm_tlv->header.len)
 894                                        - sizeof(priv->wmm_qosinfo)),
 895                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 896
 897                 ret_len = sizeof(wmm_tlv->header)
 898                           + le16_to_cpu(wmm_tlv->header.len);
 899
 900                 *assoc_buf += ret_len;
 901         }
 902
 903         return ret_len;
 904 }
 905
 906 /*
 907  * This function computes the time delay in the driver queues for a
 908  * given packet.
 909  *
 910  * When the packet is received at the OS/Driver interface, the current
 911  * time is set in the packet structure. The difference between the present
 912  * time and that received time is computed in this function and limited
 913  * based on pre-compiled limits in the driver.
 914  */
 915 u8
 916 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 917                                   const struct sk_buff *skb)
 918 {
 919         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
 920         u8 ret_val;
 921
 922         /*
 923          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 924          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 925          *
 926          * Pass max value if queue_delay is beyond the uint8 range
 927          */
 928         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 929
 930         dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 931                                 " %d ms sent to FW\n", queue_delay, ret_val);
 932
 933         return ret_val;
 934 }
 935
 936 /*
 937  * This function retrieves the highest priority RA list table pointer.
 938  */
 939 static struct mwifiex_ra_list_tbl *
 940 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 941                                      struct mwifiex_private **priv, int *tid)
 942 {
 943         struct mwifiex_private *priv_tmp;
 944         struct mwifiex_ra_list_tbl *ptr;
 945         struct mwifiex_tid_tbl *tid_ptr;
 946         atomic_t *hqp;
 947         unsigned long flags_ra;
 948         int i, j;
 949
 950         /* check the BSS with highest priority first */
 951         for (j = adapter->priv_num - 1; j >= 0; --j) {
 952                 /* iterate over BSS with the equal priority */
 953                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 954                                     &adapter->bss_prio_tbl[j].bss_prio_head,
 955                                     list) {
 956
 957                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 958
 959                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 960                                 continue;
 961
 962                         /* iterate over the WMM queues of the BSS */
 963                         hqp = &priv_tmp->wmm.highest_queued_prio;
 964                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 965
 966                                 spin_lock_irqsave(&priv_tmp->wmm.
 967                                                   ra_list_spinlock, flags_ra);
 968
 969                                 tid_ptr = &(priv_tmp)->wmm.
 970                                         tid_tbl_ptr[tos_to_tid[i]];
 971
 972                                 /* iterate over receiver addresses */
 973                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
 974                                                     list) {
 975
 976                                         if (!skb_queue_empty(&ptr->skb_head))
 977                                                 /* holds both locks */
 978                                                 goto found;
 979                                 }
 980
 981                                 spin_unlock_irqrestore(&priv_tmp->wmm.
 982                                                        ra_list_spinlock,
 983                                                        flags_ra);
 984                         }
 985                 }
 986
 987         }
 988
 989         return NULL;
 990
 991 found:
 992         /* holds ra_list_spinlock */
 993         if (atomic_read(hqp) > i)
 994                 atomic_set(hqp, i);
 995         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 996
 997         *priv = priv_tmp;
 998         *tid = tos_to_tid[i];
 999
1000         return ptr;
1001 }
1002
1003 /* This functions rotates ra and bss lists so packets are picked round robin.
1004  *
1005  * After a packet is successfully transmitted, rotate the ra list, so the ra
1006  * next to the one transmitted, will come first in the list. This way we pick
1007  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1008  * priority.
1009  *
1010  * Function also increments wmm.packets_out counter.
1011  */
1012 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1013                                  struct mwifiex_ra_list_tbl *ra,
1014                                  int tid)
1015 {
1016         struct mwifiex_adapter *adapter = priv->adapter;
1017         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1018         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1019         unsigned long flags;
1020
1021         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1022         /*
1023          * dirty trick: we remove 'head' temporarily and reinsert it after
1024          * curr bss node. imagine list to stay fixed while head is moved
1025          */
1026         list_move(&tbl[priv->bss_priority].bss_prio_head,
1027                   &tbl[priv->bss_priority].bss_prio_cur->list);
1028         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1029
1030         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1031         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1032                 priv->wmm.packets_out[tid]++;
1033                 /* same as above */
1034                 list_move(&tid_ptr->ra_list, &ra->list);
1035         }
1036         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1037 }
1038
1039 /*
1040  * This function checks if 11n aggregation is possible.
1041  */
1042 static int
1043 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1044                                     struct mwifiex_ra_list_tbl *ptr,
1045                                     int max_buf_size)
1046 {
1047         int count = 0, total_size = 0;
1048         struct sk_buff *skb, *tmp;
1049         int max_amsdu_size;
1050
1051         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1052             ptr->is_11n_enabled)
1053                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1054         else
1055                 max_amsdu_size = max_buf_size;
1056
1057         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1058                 total_size += skb->len;
1059                 if (total_size >= max_amsdu_size)
1060                         break;
1061                 if (++count >= MIN_NUM_AMSDU)
1062                         return true;
1063         }
1064
1065         return false;
1066 }
1067
1068 /*
1069  * This function sends a single packet to firmware for transmission.
1070  */
1071 static void
1072 mwifiex_send_single_packet(struct mwifiex_private *priv,
1073                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1074                            unsigned long ra_list_flags)
1075                            __releases(&priv->wmm.ra_list_spinlock)
1076 {
1077         struct sk_buff *skb, *skb_next;
1078         struct mwifiex_tx_param tx_param;
1079         struct mwifiex_adapter *adapter = priv->adapter;
1080         struct mwifiex_txinfo *tx_info;
1081
1082         if (skb_queue_empty(&ptr->skb_head)) {
1083                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1084                                        ra_list_flags);
1085                 dev_dbg(adapter->dev, "data: nothing to send\n");
1086                 return;
1087         }
1088
1089         skb = skb_dequeue(&ptr->skb_head);
1090
1091         tx_info = MWIFIEX_SKB_TXCB(skb);
1092         dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1093
1094         ptr->total_pkt_count--;
1095
1096         if (!skb_queue_empty(&ptr->skb_head))
1097                 skb_next = skb_peek(&ptr->skb_head);
1098         else
1099                 skb_next = NULL;
1100
1101         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1102
1103         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1104                                 sizeof(struct txpd) : 0);
1105
1106         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1107                 /* Queue the packet back at the head */
1108                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1109
1110                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1111                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1112                                                ra_list_flags);
1113                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1114                         return;
1115                 }
1116
1117                 skb_queue_tail(&ptr->skb_head, skb);
1118
1119                 ptr->total_pkt_count++;
1120                 ptr->ba_pkt_count++;
1121                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1122                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1123                                        ra_list_flags);
1124         } else {
1125                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1126                 atomic_dec(&priv->wmm.tx_pkts_queued);
1127         }
1128 }
1129
1130 /*
1131  * This function checks if the first packet in the given RA list
1132  * is already processed or not.
1133  */
1134 static int
1135 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1136                          struct mwifiex_ra_list_tbl *ptr)
1137 {
1138         struct sk_buff *skb;
1139         struct mwifiex_txinfo *tx_info;
1140
1141         if (skb_queue_empty(&ptr->skb_head))
1142                 return false;
1143
1144         skb = skb_peek(&ptr->skb_head);
1145
1146         tx_info = MWIFIEX_SKB_TXCB(skb);
1147         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1148                 return true;
1149
1150         return false;
1151 }
1152
1153 /*
1154  * This function sends a single processed packet to firmware for
1155  * transmission.
1156  */
1157 static void
1158 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1159                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1160                               unsigned long ra_list_flags)
1161                                 __releases(&priv->wmm.ra_list_spinlock)
1162 {
1163         struct mwifiex_tx_param tx_param;
1164         struct mwifiex_adapter *adapter = priv->adapter;
1165         int ret = -1;
1166         struct sk_buff *skb, *skb_next;
1167         struct mwifiex_txinfo *tx_info;
1168
1169         if (skb_queue_empty(&ptr->skb_head)) {
1170                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1171                                        ra_list_flags);
1172                 return;
1173         }
1174
1175         skb = skb_dequeue(&ptr->skb_head);
1176
1177         if (adapter->data_sent || adapter->tx_lock_flag) {
1178                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1179                                        ra_list_flags);
1180                 skb_queue_tail(&adapter->tx_data_q, skb);
1181                 atomic_inc(&adapter->tx_queued);
1182                 return;
1183         }
1184
1185         if (!skb_queue_empty(&ptr->skb_head))
1186                 skb_next = skb_peek(&ptr->skb_head);
1187         else
1188                 skb_next = NULL;
1189
1190         tx_info = MWIFIEX_SKB_TXCB(skb);
1191
1192         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1193
1194         if (adapter->iface_type == MWIFIEX_USB) {
1195                 adapter->data_sent = true;
1196                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1197                                                    skb, NULL);
1198         } else {
1199                 tx_param.next_pkt_len =
1200                         ((skb_next) ? skb_next->len +
1201                          sizeof(struct txpd) : 0);
1202                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1203                                                    skb, &tx_param);
1204         }
1205
1206         switch (ret) {
1207         case -EBUSY:
1208                 dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1209                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1210
1211                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1212                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1213                                                ra_list_flags);
1214                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1215                         return;
1216                 }
1217
1218                 skb_queue_tail(&ptr->skb_head, skb);
1219
1220                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1221                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1222                                        ra_list_flags);
1223                 break;
1224         case -1:
1225                 if (adapter->iface_type != MWIFIEX_PCIE)
1226                         adapter->data_sent = false;
1227                 dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1228                 adapter->dbg.num_tx_host_to_card_failure++;
1229                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1230                 break;
1231         case -EINPROGRESS:
1232                 if (adapter->iface_type != MWIFIEX_PCIE)
1233                         adapter->data_sent = false;
1234                 break;
1235         case 0:
1236                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1237         default:
1238                 break;
1239         }
1240         if (ret != -EBUSY) {
1241                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1242                 atomic_dec(&priv->wmm.tx_pkts_queued);
1243         }
1244 }
1245
1246 /*
1247  * This function dequeues a packet from the highest priority list
1248  * and transmits it.
1249  */
1250 static int
1251 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1252 {
1253         struct mwifiex_ra_list_tbl *ptr;
1254         struct mwifiex_private *priv = NULL;
1255         int ptr_index = 0;
1256         u8 ra[ETH_ALEN];
1257         int tid_del = 0, tid = 0;
1258         unsigned long flags;
1259
1260         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1261         if (!ptr)
1262                 return -1;
1263
1264         tid = mwifiex_get_tid(ptr);
1265
1266         dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1267
1268         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1269         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1270                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1271                 return -1;
1272         }
1273
1274         if (mwifiex_is_ptr_processed(priv, ptr)) {
1275                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1276                 /* ra_list_spinlock has been freed in
1277                    mwifiex_send_processed_packet() */
1278                 return 0;
1279         }
1280
1281         if (!ptr->is_11n_enabled ||
1282                 ptr->ba_status ||
1283                 priv->wps.session_enable) {
1284                 if (ptr->is_11n_enabled &&
1285                         ptr->ba_status &&
1286                         ptr->amsdu_in_ampdu &&
1287                         mwifiex_is_amsdu_allowed(priv, tid) &&
1288                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1289                                                         adapter->tx_buf_size))
1290                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1291                         /* ra_list_spinlock has been freed in
1292                          * mwifiex_11n_aggregate_pkt()
1293                          */
1294                 else
1295                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1296                         /* ra_list_spinlock has been freed in
1297                          * mwifiex_send_single_packet()
1298                          */
1299         } else {
1300                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1301                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1302                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1303                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1304                                                       BA_SETUP_INPROGRESS);
1305                                 mwifiex_send_addba(priv, tid, ptr->ra);
1306                         } else if (mwifiex_find_stream_to_delete
1307                                    (priv, tid, &tid_del, ra)) {
1308                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1309                                                       BA_SETUP_INPROGRESS);
1310                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1311                         }
1312                 }
1313                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1314                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1315                                                         adapter->tx_buf_size))
1316                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1317                         /* ra_list_spinlock has been freed in
1318                            mwifiex_11n_aggregate_pkt() */
1319                 else
1320                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1321                         /* ra_list_spinlock has been freed in
1322                            mwifiex_send_single_packet() */
1323         }
1324         return 0;
1325 }
1326
1327 /*
1328  * This function transmits the highest priority packet awaiting in the
1329  * WMM Queues.
1330  */
1331 void
1332 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1333 {
1334         do {
1335                 if (mwifiex_dequeue_tx_packet(adapter))
1336                         break;
1337                 if (adapter->iface_type != MWIFIEX_SDIO) {
1338                         if (adapter->data_sent ||
1339                             adapter->tx_lock_flag)
1340                                 break;
1341                 } else {
1342                         if (atomic_read(&adapter->tx_queued) >=
1343                             MWIFIEX_MAX_PKTS_TXQ)
1344                                 break;
1345                 }
1346         } while (!mwifiex_wmm_lists_empty(adapter));
1347 }