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         mwifiex_dbg(adapter, INFO, "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                 mwifiex_dbg(adapter, INFO,
 154                             "info: created ra_list %p\n", ra_list);
 155
 156                 if (!ra_list)
 157                         break;
 158
 159                 ra_list->is_11n_enabled = 0;
 160                 ra_list->tdls_link = false;
 161                 ra_list->ba_status = BA_SETUP_NONE;
 162                 ra_list->amsdu_in_ampdu = false;
 163                 ra_list->tx_paused = false;
 164                 if (!mwifiex_queuing_ra_based(priv)) {
 165                         if (mwifiex_get_tdls_link_status(priv, ra) ==
 166                             TDLS_SETUP_COMPLETE) {
 167                                 ra_list->tdls_link = true;
 168                                 ra_list->is_11n_enabled =
 169                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 170                         } else {
 171                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 172                         }
 173                 } else {
 174                         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 175                         node = mwifiex_get_sta_entry(priv, ra);
 176                         ra_list->is_11n_enabled =
 177                                       mwifiex_is_sta_11n_enabled(priv, node);
 178                         if (ra_list->is_11n_enabled)
 179                                 ra_list->max_amsdu = node->max_amsdu;
 180                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 181                 }
 182
 183                 mwifiex_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
 184                             ra_list, ra_list->is_11n_enabled);
 185
 186                 if (ra_list->is_11n_enabled) {
 187                         ra_list->ba_pkt_count = 0;
 188                         ra_list->ba_packet_thr =
 189                                               mwifiex_get_random_ba_threshold();
 190                 }
 191                 list_add_tail(&ra_list->list,
 192                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 193         }
 194 }
 195
 196 /*
 197  * This function sets the WMM queue priorities to their default values.
 198  */
 199 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 200 {
 201         /* Default queue priorities: VO->VI->BE->BK */
 202         priv->wmm.queue_priority[0] = WMM_AC_VO;
 203         priv->wmm.queue_priority[1] = WMM_AC_VI;
 204         priv->wmm.queue_priority[2] = WMM_AC_BE;
 205         priv->wmm.queue_priority[3] = WMM_AC_BK;
 206 }
 207
 208 /*
 209  * This function map ACs to TIDs.
 210  */
 211 static void
 212 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
 213 {
 214         struct mwifiex_wmm_desc *wmm = &priv->wmm;
 215         u8 *queue_priority = wmm->queue_priority;
 216         int i;
 217
 218         for (i = 0; i < 4; ++i) {
 219                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 220                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 221         }
 222
 223         for (i = 0; i < MAX_NUM_TID; ++i)
 224                 priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 225
 226         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 227 }
 228
 229 /*
 230  * This function initializes WMM priority queues.
 231  */
 232 void
 233 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 234                                    struct ieee_types_wmm_parameter *wmm_ie)
 235 {
 236         u16 cw_min, avg_back_off, tmp[4];
 237         u32 i, j, num_ac;
 238         u8 ac_idx;
 239
 240         if (!wmm_ie || !priv->wmm_enabled) {
 241                 /* WMM is not enabled, just set the defaults and return */
 242                 mwifiex_wmm_default_queue_priorities(priv);
 243                 return;
 244         }
 245
 246         mwifiex_dbg(priv->adapter, INFO,
 247                     "info: WMM Parameter IE: version=%d,\t"
 248                     "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 249                     wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 250                     IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 251                     wmm_ie->reserved);
 252
 253         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 254                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 255                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 256                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 257                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 258
 259                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 260                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 261                 tmp[ac_idx] = avg_back_off;
 262
 263                 mwifiex_dbg(priv->adapter, INFO,
 264                             "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 265                             (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 266                             cw_min, avg_back_off);
 267                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 268         }
 269
 270         /* Bubble sort */
 271         for (i = 0; i < num_ac; i++) {
 272                 for (j = 1; j < num_ac - i; j++) {
 273                         if (tmp[j - 1] > tmp[j]) {
 274                                 swap(tmp[j - 1], tmp[j]);
 275                                 swap(priv->wmm.queue_priority[j - 1],
 276                                      priv->wmm.queue_priority[j]);
 277                         } else if (tmp[j - 1] == tmp[j]) {
 278                                 if (priv->wmm.queue_priority[j - 1]
 279                                     < priv->wmm.queue_priority[j])
 280                                         swap(priv->wmm.queue_priority[j - 1],
 281                                              priv->wmm.queue_priority[j]);
 282                         }
 283                 }
 284         }
 285
 286         mwifiex_wmm_queue_priorities_tid(priv);
 287 }
 288
 289 /*
 290  * This function evaluates whether or not an AC is to be downgraded.
 291  *
 292  * In case the AC is not enabled, the highest AC is returned that is
 293  * enabled and does not require admission control.
 294  */
 295 static enum mwifiex_wmm_ac_e
 296 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 297                               enum mwifiex_wmm_ac_e eval_ac)
 298 {
 299         int down_ac;
 300         enum mwifiex_wmm_ac_e ret_ac;
 301         struct mwifiex_wmm_ac_status *ac_status;
 302
 303         ac_status = &priv->wmm.ac_status[eval_ac];
 304
 305         if (!ac_status->disabled)
 306                 /* Okay to use this AC, its enabled */
 307                 return eval_ac;
 308
 309         /* Setup a default return value of the lowest priority */
 310         ret_ac = WMM_AC_BK;
 311
 312         /*
 313          *  Find the highest AC that is enabled and does not require
 314          *  admission control. The spec disallows downgrading to an AC,
 315          *  which is enabled due to a completed admission control.
 316          *  Unadmitted traffic is not to be sent on an AC with admitted
 317          *  traffic.
 318          */
 319         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 320                 ac_status = &priv->wmm.ac_status[down_ac];
 321
 322                 if (!ac_status->disabled && !ac_status->flow_required)
 323                         /* AC is enabled and does not require admission
 324                            control */
 325                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 326         }
 327
 328         return ret_ac;
 329 }
 330
 331 /*
 332  * This function downgrades WMM priority queue.
 333  */
 334 void
 335 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 336 {
 337         int ac_val;
 338
 339         mwifiex_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
 340                     "BK(0), BE(1), VI(2), VO(3)\n");
 341
 342         if (!priv->wmm_enabled) {
 343                 /* WMM is not enabled, default priorities */
 344                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 345                         priv->wmm.ac_down_graded_vals[ac_val] =
 346                                                 (enum mwifiex_wmm_ac_e) ac_val;
 347         } else {
 348                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 349                         priv->wmm.ac_down_graded_vals[ac_val]
 350                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 351                                                 (enum mwifiex_wmm_ac_e) ac_val);
 352                         mwifiex_dbg(priv->adapter, INFO,
 353                                     "info: WMM: AC PRIO %d maps to %d\n",
 354                                     ac_val,
 355                                     priv->wmm.ac_down_graded_vals[ac_val]);
 356                 }
 357         }
 358 }
 359
 360 /*
 361  * This function converts the IP TOS field to an WMM AC
 362  * Queue assignment.
 363  */
 364 static enum mwifiex_wmm_ac_e
 365 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 366 {
 367         /* Map of TOS UP values to WMM AC */
 368         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 369                 WMM_AC_BK,
 370                 WMM_AC_BK,
 371                 WMM_AC_BE,
 372                 WMM_AC_VI,
 373                 WMM_AC_VI,
 374                 WMM_AC_VO,
 375                 WMM_AC_VO
 376         };
 377
 378         if (tos >= ARRAY_SIZE(tos_to_ac))
 379                 return WMM_AC_BE;
 380
 381         return tos_to_ac[tos];
 382 }
 383
 384 /*
 385  * This function evaluates a given TID and downgrades it to a lower
 386  * TID if the WMM Parameter IE received from the AP indicates that the
 387  * AP is disabled (due to call admission control (ACM bit). Mapping
 388  * of TID to AC is taken care of internally.
 389  */
 390 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 391 {
 392         enum mwifiex_wmm_ac_e ac, ac_down;
 393         u8 new_tid;
 394
 395         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 396         ac_down = priv->wmm.ac_down_graded_vals[ac];
 397
 398         /* Send the index to tid array, picking from the array will be
 399          * taken care by dequeuing function
 400          */
 401         new_tid = ac_to_tid[ac_down][tid % 2];
 402
 403         return new_tid;
 404 }
 405
 406 /*
 407  * This function initializes the WMM state information and the
 408  * WMM data path queues.
 409  */
 410 void
 411 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 412 {
 413         int i, j;
 414         struct mwifiex_private *priv;
 415
 416         for (j = 0; j < adapter->priv_num; ++j) {
 417                 priv = adapter->priv[j];
 418                 if (!priv)
 419                         continue;
 420
 421                 for (i = 0; i < MAX_NUM_TID; ++i) {
 422                         if (!disable_tx_amsdu &&
 423                             adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
 424                                 priv->aggr_prio_tbl[i].amsdu =
 425                                                         priv->tos_to_tid_inv[i];
 426                         else
 427                                 priv->aggr_prio_tbl[i].amsdu =
 428                                                         BA_STREAM_NOT_ALLOWED;
 429                         priv->aggr_prio_tbl[i].ampdu_ap =
 430                                                         priv->tos_to_tid_inv[i];
 431                         priv->aggr_prio_tbl[i].ampdu_user =
 432                                                         priv->tos_to_tid_inv[i];
 433                 }
 434
 435                 priv->aggr_prio_tbl[6].amsdu
 436                                         = priv->aggr_prio_tbl[6].ampdu_ap
 437                                         = priv->aggr_prio_tbl[6].ampdu_user
 438                                         = BA_STREAM_NOT_ALLOWED;
 439
 440                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 441                                         = priv->aggr_prio_tbl[7].ampdu_user
 442                                         = BA_STREAM_NOT_ALLOWED;
 443
 444                 mwifiex_set_ba_params(priv);
 445                 mwifiex_reset_11n_rx_seq_num(priv);
 446
 447                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 448                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 449         }
 450 }
 451
 452 /*
 453  * This function checks if WMM Tx queue is empty.
 454  */
 455 int
 456 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 457 {
 458         int i;
 459         struct mwifiex_private *priv;
 460
 461         for (i = 0; i < adapter->priv_num; ++i) {
 462                 priv = adapter->priv[i];
 463                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 464                         return false;
 465         }
 466
 467         return true;
 468 }
 469
 470 /*
 471  * This function deletes all packets in an RA list node.
 472  *
 473  * The packet sent completion callback handler are called with
 474  * status failure, after they are dequeued to ensure proper
 475  * cleanup. The RA list node itself is freed at the end.
 476  */
 477 static void
 478 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 479                                     struct mwifiex_ra_list_tbl *ra_list)
 480 {
 481         struct mwifiex_adapter *adapter = priv->adapter;
 482         struct sk_buff *skb, *tmp;
 483
 484         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 485                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 486 }
 487
 488 /*
 489  * This function deletes all packets in an RA list.
 490  *
 491  * Each nodes in the RA list are freed individually first, and then
 492  * the RA list itself is freed.
 493  */
 494 static void
 495 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 496                                struct list_head *ra_list_head)
 497 {
 498         struct mwifiex_ra_list_tbl *ra_list;
 499
 500         list_for_each_entry(ra_list, ra_list_head, list)
 501                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 502 }
 503
 504 /*
 505  * This function deletes all packets in all RA lists.
 506  */
 507 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 508 {
 509         int i;
 510
 511         for (i = 0; i < MAX_NUM_TID; i++)
 512                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 513                                                                        ra_list);
 514
 515         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 516         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 517 }
 518
 519 /*
 520  * This function deletes all route addresses from all RA lists.
 521  */
 522 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 523 {
 524         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 525         int i;
 526
 527         for (i = 0; i < MAX_NUM_TID; ++i) {
 528                 mwifiex_dbg(priv->adapter, INFO,
 529                             "info: ra_list: freeing buf for tid %d\n", i);
 530                 list_for_each_entry_safe(ra_list, tmp_node,
 531                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 532                                          list) {
 533                         list_del(&ra_list->list);
 534                         kfree(ra_list);
 535                 }
 536
 537                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 538         }
 539 }
 540
 541 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 542 {
 543         pr_warn("Have pending ack frames!\n");
 544         kfree_skb(p);
 545         return 0;
 546 }
 547
 548 /*
 549  * This function cleans up the Tx and Rx queues.
 550  *
 551  * Cleanup includes -
 552  *      - All packets in RA lists
 553  *      - All entries in Rx reorder table
 554  *      - All entries in Tx BA stream table
 555  *      - MPA buffer (if required)
 556  *      - All RA lists
 557  */
 558 void
 559 mwifiex_clean_txrx(struct mwifiex_private *priv)
 560 {
 561         unsigned long flags;
 562         struct sk_buff *skb, *tmp;
 563
 564         mwifiex_11n_cleanup_reorder_tbl(priv);
 565         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 566
 567         mwifiex_wmm_cleanup_queues(priv);
 568         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 569
 570         if (priv->adapter->if_ops.cleanup_mpa_buf)
 571                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 572
 573         mwifiex_wmm_delete_all_ralist(priv);
 574         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 575
 576         if (priv->adapter->if_ops.clean_pcie_ring &&
 577             !priv->adapter->surprise_removed)
 578                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 579         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 580
 581         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 582                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 583
 584         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 585         idr_destroy(&priv->ack_status_frames);
 586 }
 587
 588 /*
 589  * This function retrieves a particular RA list node, matching with the
 590  * given TID and RA address.
 591  */
 592 struct mwifiex_ra_list_tbl *
 593 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 594                             const u8 *ra_addr)
 595 {
 596         struct mwifiex_ra_list_tbl *ra_list;
 597
 598         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 599                             list) {
 600                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 601                         return ra_list;
 602         }
 603
 604         return NULL;
 605 }
 606
 607 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
 608                                     u8 tx_pause)
 609 {
 610         struct mwifiex_ra_list_tbl *ra_list;
 611         u32 pkt_cnt = 0, tx_pkts_queued;
 612         unsigned long flags;
 613         int i;
 614
 615         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 616
 617         for (i = 0; i < MAX_NUM_TID; ++i) {
 618                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
 619                 if (ra_list && ra_list->tx_paused != tx_pause) {
 620                         pkt_cnt += ra_list->total_pkt_count;
 621                         ra_list->tx_paused = tx_pause;
 622                         if (tx_pause)
 623                                 priv->wmm.pkts_paused[i] +=
 624                                         ra_list->total_pkt_count;
 625                         else
 626                                 priv->wmm.pkts_paused[i] -=
 627                                         ra_list->total_pkt_count;
 628                 }
 629         }
 630
 631         if (pkt_cnt) {
 632                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 633                 if (tx_pause)
 634                         tx_pkts_queued -= pkt_cnt;
 635                 else
 636                         tx_pkts_queued += pkt_cnt;
 637
 638                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 639                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 640         }
 641         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 642 }
 643
 644 /* This function update non-tdls peer ralist tx_pause while
 645  * tdls channel swithing
 646  */
 647 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
 648                                                u8 *mac, u8 tx_pause)
 649 {
 650         struct mwifiex_ra_list_tbl *ra_list;
 651         u32 pkt_cnt = 0, tx_pkts_queued;
 652         unsigned long flags;
 653         int i;
 654
 655         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 656
 657         for (i = 0; i < MAX_NUM_TID; ++i) {
 658                 list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
 659                                     list) {
 660                         if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 661                                 continue;
 662
 663                         if (ra_list && ra_list->tx_paused != tx_pause) {
 664                                 pkt_cnt += ra_list->total_pkt_count;
 665                                 ra_list->tx_paused = tx_pause;
 666                                 if (tx_pause)
 667                                         priv->wmm.pkts_paused[i] +=
 668                                                 ra_list->total_pkt_count;
 669                                 else
 670                                         priv->wmm.pkts_paused[i] -=
 671                                                 ra_list->total_pkt_count;
 672                         }
 673                 }
 674         }
 675
 676         if (pkt_cnt) {
 677                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 678                 if (tx_pause)
 679                         tx_pkts_queued -= pkt_cnt;
 680                 else
 681                         tx_pkts_queued += pkt_cnt;
 682
 683                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 684                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 685         }
 686         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 687 }
 688
 689 /*
 690  * This function retrieves an RA list node for a given TID and
 691  * RA address pair.
 692  *
 693  * If no such node is found, a new node is added first and then
 694  * retrieved.
 695  */
 696 struct mwifiex_ra_list_tbl *
 697 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 698                             const u8 *ra_addr)
 699 {
 700         struct mwifiex_ra_list_tbl *ra_list;
 701
 702         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 703         if (ra_list)
 704                 return ra_list;
 705         mwifiex_ralist_add(priv, ra_addr);
 706
 707         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 708 }
 709
 710 /*
 711  * This function deletes RA list nodes for given mac for all TIDs.
 712  * Function also decrements TX pending count accordingly.
 713  */
 714 void
 715 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 716 {
 717         struct mwifiex_ra_list_tbl *ra_list;
 718         unsigned long flags;
 719         int i;
 720
 721         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 722
 723         for (i = 0; i < MAX_NUM_TID; ++i) {
 724                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 725
 726                 if (!ra_list)
 727                         continue;
 728                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 729                 atomic_sub(ra_list->total_pkt_count, &priv->wmm.tx_pkts_queued);
 730                 list_del(&ra_list->list);
 731                 kfree(ra_list);
 732         }
 733         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 734 }
 735
 736 /*
 737  * This function checks if a particular RA list node exists in a given TID
 738  * table index.
 739  */
 740 int
 741 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 742                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 743 {
 744         struct mwifiex_ra_list_tbl *rlist;
 745
 746         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 747                             list) {
 748                 if (rlist == ra_list)
 749                         return true;
 750         }
 751
 752         return false;
 753 }
 754
 755 /*
 756  * This function adds a packet to WMM queue.
 757  *
 758  * In disconnected state the packet is immediately dropped and the
 759  * packet send completion callback is called with status failure.
 760  *
 761  * Otherwise, the correct RA list node is located and the packet
 762  * is queued at the list tail.
 763  */
 764 void
 765 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 766                             struct sk_buff *skb)
 767 {
 768         struct mwifiex_adapter *adapter = priv->adapter;
 769         u32 tid;
 770         struct mwifiex_ra_list_tbl *ra_list;
 771         u8 ra[ETH_ALEN], tid_down;
 772         unsigned long flags;
 773         struct list_head list_head;
 774         int tdls_status = TDLS_NOT_SETUP;
 775         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 776         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 777
 778         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 779
 780         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 781             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 782                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 783                         mwifiex_dbg(adapter, DATA,
 784                                     "TDLS setup packet for %pM.\t"
 785                                     "Don't block\n", ra);
 786                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 787                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 788         }
 789
 790         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 791                 mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
 792                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 793                 return;
 794         }
 795
 796         tid = skb->priority;
 797
 798         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 799
 800         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 801
 802         /* In case of infra as we have already created the list during
 803            association we just don't have to call get_queue_raptr, we will
 804            have only 1 raptr for a tid in case of infra */
 805         if (!mwifiex_queuing_ra_based(priv) &&
 806             !mwifiex_is_skb_mgmt_frame(skb)) {
 807                 switch (tdls_status) {
 808                 case TDLS_SETUP_COMPLETE:
 809                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 810                                                               ra);
 811                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 812                         break;
 813                 case TDLS_SETUP_INPROGRESS:
 814                         skb_queue_tail(&priv->tdls_txq, skb);
 815                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 816                                                flags);
 817                         return;
 818                 default:
 819                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 820                         if (!list_empty(&list_head))
 821                                 ra_list = list_first_entry(
 822                                         &list_head, struct mwifiex_ra_list_tbl,
 823                                         list);
 824                         else
 825                                 ra_list = NULL;
 826                         break;
 827                 }
 828         } else {
 829                 memcpy(ra, skb->data, ETH_ALEN);
 830                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 831                         eth_broadcast_addr(ra);
 832                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 833         }
 834
 835         if (!ra_list) {
 836                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 837                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 838                 return;
 839         }
 840
 841         skb_queue_tail(&ra_list->skb_head, skb);
 842
 843         ra_list->ba_pkt_count++;
 844         ra_list->total_pkt_count++;
 845
 846         if (atomic_read(&priv->wmm.highest_queued_prio) <
 847                                                 priv->tos_to_tid_inv[tid_down])
 848                 atomic_set(&priv->wmm.highest_queued_prio,
 849                            priv->tos_to_tid_inv[tid_down]);
 850
 851         if (ra_list->tx_paused)
 852                 priv->wmm.pkts_paused[tid_down]++;
 853         else
 854                 atomic_inc(&priv->wmm.tx_pkts_queued);
 855
 856         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 857 }
 858
 859 /*
 860  * This function processes the get WMM status command response from firmware.
 861  *
 862  * The response may contain multiple TLVs -
 863  *      - AC Queue status TLVs
 864  *      - Current WMM Parameter IE TLV
 865  *      - Admission Control action frame TLVs
 866  *
 867  * This function parses the TLVs and then calls further specific functions
 868  * to process any changes in the queue prioritize or state.
 869  */
 870 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 871                                const struct host_cmd_ds_command *resp)
 872 {
 873         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 874         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 875         int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
 876         bool valid = true;
 877
 878         struct mwifiex_ie_types_data *tlv_hdr;
 879         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 880         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 881         struct mwifiex_wmm_ac_status *ac_status;
 882
 883         mwifiex_dbg(priv->adapter, INFO,
 884                     "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 885                     resp_len);
 886
 887         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 888                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 889                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 890
 891                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 892                         break;
 893
 894                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 895                 case TLV_TYPE_WMMQSTATUS:
 896                         tlv_wmm_qstatus =
 897                                 (struct mwifiex_ie_types_wmm_queue_status *)
 898                                 tlv_hdr;
 899                         mwifiex_dbg(priv->adapter, CMD,
 900                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 901                                     "QSTATUS TLV: %d, %d, %d\n",
 902                                     tlv_wmm_qstatus->queue_index,
 903                                     tlv_wmm_qstatus->flow_required,
 904                                     tlv_wmm_qstatus->disabled);
 905
 906                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 907                                                          queue_index];
 908                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 909                         ac_status->flow_required =
 910                                                 tlv_wmm_qstatus->flow_required;
 911                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 912                         break;
 913
 914                 case WLAN_EID_VENDOR_SPECIFIC:
 915                         /*
 916                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 917                          *   and setup the IEEE IE type and length byte fields
 918                          */
 919
 920                         wmm_param_ie =
 921                                 (struct ieee_types_wmm_parameter *) (curr +
 922                                                                     2);
 923                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 924                         wmm_param_ie->vend_hdr.element_id =
 925                                                 WLAN_EID_VENDOR_SPECIFIC;
 926
 927                         mwifiex_dbg(priv->adapter, CMD,
 928                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 929                                     "WMM Parameter Set Count: %d\n",
 930                                     wmm_param_ie->qos_info_bitmap & mask);
 931
 932                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 933                                wmm_ie, wmm_param_ie,
 934                                wmm_param_ie->vend_hdr.len + 2);
 935
 936                         break;
 937
 938                 default:
 939                         valid = false;
 940                         break;
 941                 }
 942
 943                 curr += (tlv_len + sizeof(tlv_hdr->header));
 944                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 945         }
 946
 947         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 948         mwifiex_wmm_setup_ac_downgrade(priv);
 949
 950         return 0;
 951 }
 952
 953 /*
 954  * Callback handler from the command module to allow insertion of a WMM TLV.
 955  *
 956  * If the BSS we are associating to supports WMM, this function adds the
 957  * required WMM Information IE to the association request command buffer in
 958  * the form of a Marvell extended IEEE IE.
 959  */
 960 u32
 961 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 962                                     u8 **assoc_buf,
 963                                     struct ieee_types_wmm_parameter *wmm_ie,
 964                                     struct ieee80211_ht_cap *ht_cap)
 965 {
 966         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 967         u32 ret_len = 0;
 968
 969         /* Null checks */
 970         if (!assoc_buf)
 971                 return 0;
 972         if (!(*assoc_buf))
 973                 return 0;
 974
 975         if (!wmm_ie)
 976                 return 0;
 977
 978         mwifiex_dbg(priv->adapter, INFO,
 979                     "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 980                     wmm_ie->vend_hdr.element_id);
 981
 982         if ((priv->wmm_required ||
 983              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 984              priv->adapter->config_bands & BAND_AN))) &&
 985             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 986                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 987                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 988                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 989                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 990                        le16_to_cpu(wmm_tlv->header.len));
 991                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 992                         memcpy((u8 *) (wmm_tlv->wmm_ie
 993                                        + le16_to_cpu(wmm_tlv->header.len)
 994                                        - sizeof(priv->wmm_qosinfo)),
 995                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 996
 997                 ret_len = sizeof(wmm_tlv->header)
 998                           + le16_to_cpu(wmm_tlv->header.len);
 999
1000                 *assoc_buf += ret_len;
1001         }
1002
1003         return ret_len;
1004 }
1005
1006 /*
1007  * This function computes the time delay in the driver queues for a
1008  * given packet.
1009  *
1010  * When the packet is received at the OS/Driver interface, the current
1011  * time is set in the packet structure. The difference between the present
1012  * time and that received time is computed in this function and limited
1013  * based on pre-compiled limits in the driver.
1014  */
1015 u8
1016 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1017                                   const struct sk_buff *skb)
1018 {
1019         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1020         u8 ret_val;
1021
1022         /*
1023          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1024          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1025          *
1026          * Pass max value if queue_delay is beyond the uint8 range
1027          */
1028         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1029
1030         mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1031                     "%d ms sent to FW\n", queue_delay, ret_val);
1032
1033         return ret_val;
1034 }
1035
1036 /*
1037  * This function retrieves the highest priority RA list table pointer.
1038  */
1039 static struct mwifiex_ra_list_tbl *
1040 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1041                                      struct mwifiex_private **priv, int *tid)
1042 {
1043         struct mwifiex_private *priv_tmp;
1044         struct mwifiex_ra_list_tbl *ptr;
1045         struct mwifiex_tid_tbl *tid_ptr;
1046         atomic_t *hqp;
1047         unsigned long flags_ra;
1048         int i, j;
1049
1050         /* check the BSS with highest priority first */
1051         for (j = adapter->priv_num - 1; j >= 0; --j) {
1052                 /* iterate over BSS with the equal priority */
1053                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1054                                     &adapter->bss_prio_tbl[j].bss_prio_head,
1055                                     list) {
1056
1057                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1058
1059                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
1060                                 continue;
1061
1062                         /* iterate over the WMM queues of the BSS */
1063                         hqp = &priv_tmp->wmm.highest_queued_prio;
1064                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1065
1066                                 spin_lock_irqsave(&priv_tmp->wmm.
1067                                                   ra_list_spinlock, flags_ra);
1068
1069                                 tid_ptr = &(priv_tmp)->wmm.
1070                                         tid_tbl_ptr[tos_to_tid[i]];
1071
1072                                 /* iterate over receiver addresses */
1073                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1074                                                     list) {
1075
1076                                         if (!ptr->tx_paused &&
1077                                             !skb_queue_empty(&ptr->skb_head))
1078                                                 /* holds both locks */
1079                                                 goto found;
1080                                 }
1081
1082                                 spin_unlock_irqrestore(&priv_tmp->wmm.
1083                                                        ra_list_spinlock,
1084                                                        flags_ra);
1085                         }
1086                 }
1087
1088         }
1089
1090         return NULL;
1091
1092 found:
1093         /* holds ra_list_spinlock */
1094         if (atomic_read(hqp) > i)
1095                 atomic_set(hqp, i);
1096         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1097
1098         *priv = priv_tmp;
1099         *tid = tos_to_tid[i];
1100
1101         return ptr;
1102 }
1103
1104 /* This functions rotates ra and bss lists so packets are picked round robin.
1105  *
1106  * After a packet is successfully transmitted, rotate the ra list, so the ra
1107  * next to the one transmitted, will come first in the list. This way we pick
1108  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1109  * priority.
1110  *
1111  * Function also increments wmm.packets_out counter.
1112  */
1113 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1114                                  struct mwifiex_ra_list_tbl *ra,
1115                                  int tid)
1116 {
1117         struct mwifiex_adapter *adapter = priv->adapter;
1118         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1119         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1120         unsigned long flags;
1121
1122         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1123         /*
1124          * dirty trick: we remove 'head' temporarily and reinsert it after
1125          * curr bss node. imagine list to stay fixed while head is moved
1126          */
1127         list_move(&tbl[priv->bss_priority].bss_prio_head,
1128                   &tbl[priv->bss_priority].bss_prio_cur->list);
1129         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1130
1131         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1132         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1133                 priv->wmm.packets_out[tid]++;
1134                 /* same as above */
1135                 list_move(&tid_ptr->ra_list, &ra->list);
1136         }
1137         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1138 }
1139
1140 /*
1141  * This function checks if 11n aggregation is possible.
1142  */
1143 static int
1144 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1145                                     struct mwifiex_ra_list_tbl *ptr,
1146                                     int max_buf_size)
1147 {
1148         int count = 0, total_size = 0;
1149         struct sk_buff *skb, *tmp;
1150         int max_amsdu_size;
1151
1152         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1153             ptr->is_11n_enabled)
1154                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1155         else
1156                 max_amsdu_size = max_buf_size;
1157
1158         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1159                 total_size += skb->len;
1160                 if (total_size >= max_amsdu_size)
1161                         break;
1162                 if (++count >= MIN_NUM_AMSDU)
1163                         return true;
1164         }
1165
1166         return false;
1167 }
1168
1169 /*
1170  * This function sends a single packet to firmware for transmission.
1171  */
1172 static void
1173 mwifiex_send_single_packet(struct mwifiex_private *priv,
1174                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1175                            unsigned long ra_list_flags)
1176                            __releases(&priv->wmm.ra_list_spinlock)
1177 {
1178         struct sk_buff *skb, *skb_next;
1179         struct mwifiex_tx_param tx_param;
1180         struct mwifiex_adapter *adapter = priv->adapter;
1181         struct mwifiex_txinfo *tx_info;
1182
1183         if (skb_queue_empty(&ptr->skb_head)) {
1184                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1185                                        ra_list_flags);
1186                 mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1187                 return;
1188         }
1189
1190         skb = skb_dequeue(&ptr->skb_head);
1191
1192         tx_info = MWIFIEX_SKB_TXCB(skb);
1193         mwifiex_dbg(adapter, DATA,
1194                     "data: dequeuing the packet %p %p\n", ptr, skb);
1195
1196         ptr->total_pkt_count--;
1197
1198         if (!skb_queue_empty(&ptr->skb_head))
1199                 skb_next = skb_peek(&ptr->skb_head);
1200         else
1201                 skb_next = NULL;
1202
1203         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1204
1205         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1206                                 sizeof(struct txpd) : 0);
1207
1208         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1209                 /* Queue the packet back at the head */
1210                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1211
1212                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1213                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1214                                                ra_list_flags);
1215                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1216                         return;
1217                 }
1218
1219                 skb_queue_tail(&ptr->skb_head, skb);
1220
1221                 ptr->total_pkt_count++;
1222                 ptr->ba_pkt_count++;
1223                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1224                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1225                                        ra_list_flags);
1226         } else {
1227                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1228                 atomic_dec(&priv->wmm.tx_pkts_queued);
1229         }
1230 }
1231
1232 /*
1233  * This function checks if the first packet in the given RA list
1234  * is already processed or not.
1235  */
1236 static int
1237 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1238                          struct mwifiex_ra_list_tbl *ptr)
1239 {
1240         struct sk_buff *skb;
1241         struct mwifiex_txinfo *tx_info;
1242
1243         if (skb_queue_empty(&ptr->skb_head))
1244                 return false;
1245
1246         skb = skb_peek(&ptr->skb_head);
1247
1248         tx_info = MWIFIEX_SKB_TXCB(skb);
1249         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1250                 return true;
1251
1252         return false;
1253 }
1254
1255 /*
1256  * This function sends a single processed packet to firmware for
1257  * transmission.
1258  */
1259 static void
1260 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1261                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1262                               unsigned long ra_list_flags)
1263                                 __releases(&priv->wmm.ra_list_spinlock)
1264 {
1265         struct mwifiex_tx_param tx_param;
1266         struct mwifiex_adapter *adapter = priv->adapter;
1267         int ret = -1;
1268         struct sk_buff *skb, *skb_next;
1269         struct mwifiex_txinfo *tx_info;
1270
1271         if (skb_queue_empty(&ptr->skb_head)) {
1272                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1273                                        ra_list_flags);
1274                 return;
1275         }
1276
1277         skb = skb_dequeue(&ptr->skb_head);
1278
1279         if (adapter->data_sent || adapter->tx_lock_flag) {
1280                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1281                                        ra_list_flags);
1282                 skb_queue_tail(&adapter->tx_data_q, skb);
1283                 atomic_inc(&adapter->tx_queued);
1284                 return;
1285         }
1286
1287         if (!skb_queue_empty(&ptr->skb_head))
1288                 skb_next = skb_peek(&ptr->skb_head);
1289         else
1290                 skb_next = NULL;
1291
1292         tx_info = MWIFIEX_SKB_TXCB(skb);
1293
1294         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1295
1296         if (adapter->iface_type == MWIFIEX_USB) {
1297                 adapter->data_sent = true;
1298                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1299                                                    skb, NULL);
1300         } else {
1301                 tx_param.next_pkt_len =
1302                         ((skb_next) ? skb_next->len +
1303                          sizeof(struct txpd) : 0);
1304                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1305                                                    skb, &tx_param);
1306         }
1307
1308         switch (ret) {
1309         case -EBUSY:
1310                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1311                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1312
1313                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1314                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1315                                                ra_list_flags);
1316                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1317                         return;
1318                 }
1319
1320                 skb_queue_tail(&ptr->skb_head, skb);
1321
1322                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1323                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1324                                        ra_list_flags);
1325                 break;
1326         case -1:
1327                 if (adapter->iface_type != MWIFIEX_PCIE)
1328                         adapter->data_sent = false;
1329                 mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1330                 adapter->dbg.num_tx_host_to_card_failure++;
1331                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1332                 break;
1333         case -EINPROGRESS:
1334                 if (adapter->iface_type != MWIFIEX_PCIE)
1335                         adapter->data_sent = false;
1336                 break;
1337         case 0:
1338                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1339         default:
1340                 break;
1341         }
1342         if (ret != -EBUSY) {
1343                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1344                 atomic_dec(&priv->wmm.tx_pkts_queued);
1345         }
1346 }
1347
1348 /*
1349  * This function dequeues a packet from the highest priority list
1350  * and transmits it.
1351  */
1352 static int
1353 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1354 {
1355         struct mwifiex_ra_list_tbl *ptr;
1356         struct mwifiex_private *priv = NULL;
1357         int ptr_index = 0;
1358         u8 ra[ETH_ALEN];
1359         int tid_del = 0, tid = 0;
1360         unsigned long flags;
1361
1362         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1363         if (!ptr)
1364                 return -1;
1365
1366         tid = mwifiex_get_tid(ptr);
1367
1368         mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1369
1370         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1371         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1372                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1373                 return -1;
1374         }
1375
1376         if (mwifiex_is_ptr_processed(priv, ptr)) {
1377                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1378                 /* ra_list_spinlock has been freed in
1379                    mwifiex_send_processed_packet() */
1380                 return 0;
1381         }
1382
1383         if (!ptr->is_11n_enabled ||
1384                 ptr->ba_status ||
1385                 priv->wps.session_enable) {
1386                 if (ptr->is_11n_enabled &&
1387                         ptr->ba_status &&
1388                         ptr->amsdu_in_ampdu &&
1389                         mwifiex_is_amsdu_allowed(priv, tid) &&
1390                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1391                                                         adapter->tx_buf_size))
1392                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1393                         /* ra_list_spinlock has been freed in
1394                          * mwifiex_11n_aggregate_pkt()
1395                          */
1396                 else
1397                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1398                         /* ra_list_spinlock has been freed in
1399                          * mwifiex_send_single_packet()
1400                          */
1401         } else {
1402                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1403                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1404                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1405                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1406                                                       BA_SETUP_INPROGRESS);
1407                                 mwifiex_send_addba(priv, tid, ptr->ra);
1408                         } else if (mwifiex_find_stream_to_delete
1409                                    (priv, tid, &tid_del, ra)) {
1410                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1411                                                       BA_SETUP_INPROGRESS);
1412                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1413                         }
1414                 }
1415                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1416                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1417                                                         adapter->tx_buf_size))
1418                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1419                         /* ra_list_spinlock has been freed in
1420                            mwifiex_11n_aggregate_pkt() */
1421                 else
1422                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1423                         /* ra_list_spinlock has been freed in
1424                            mwifiex_send_single_packet() */
1425         }
1426         return 0;
1427 }
1428
1429 /*
1430  * This function transmits the highest priority packet awaiting in the
1431  * WMM Queues.
1432  */
1433 void
1434 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1435 {
1436         do {
1437                 if (mwifiex_dequeue_tx_packet(adapter))
1438                         break;
1439                 if (adapter->iface_type != MWIFIEX_SDIO) {
1440                         if (adapter->data_sent ||
1441                             adapter->tx_lock_flag)
1442                                 break;
1443                 } else {
1444                         if (atomic_read(&adapter->tx_queued) >=
1445                             MWIFIEX_MAX_PKTS_TXQ)
1446                                 break;
1447                 }
1448         } while (!mwifiex_wmm_lists_empty(adapter));
1449 }