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                 if (!mwifiex_queuing_ra_based(priv)) {
 164                         if (mwifiex_is_tdls_link_setup
 165                                 (mwifiex_get_tdls_link_status(priv, ra))) {
 166                                 ra_list->tdls_link = true;
 167                                 ra_list->is_11n_enabled =
 168                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 169                         } else {
 170                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 171                         }
 172                 } else {
 173                         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 174                         node = mwifiex_get_sta_entry(priv, ra);
 175                         if (node)
 176                                 ra_list->tx_paused = node->tx_pause;
 177                         ra_list->is_11n_enabled =
 178                                       mwifiex_is_sta_11n_enabled(priv, node);
 179                         if (ra_list->is_11n_enabled)
 180                                 ra_list->max_amsdu = node->max_amsdu;
 181                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 182                 }
 183
 184                 mwifiex_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
 185                             ra_list, ra_list->is_11n_enabled);
 186
 187                 if (ra_list->is_11n_enabled) {
 188                         ra_list->ba_pkt_count = 0;
 189                         ra_list->ba_packet_thr =
 190                                               mwifiex_get_random_ba_threshold();
 191                 }
 192                 list_add_tail(&ra_list->list,
 193                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 194         }
 195 }
 196
 197 /*
 198  * This function sets the WMM queue priorities to their default values.
 199  */
 200 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 201 {
 202         /* Default queue priorities: VO->VI->BE->BK */
 203         priv->wmm.queue_priority[0] = WMM_AC_VO;
 204         priv->wmm.queue_priority[1] = WMM_AC_VI;
 205         priv->wmm.queue_priority[2] = WMM_AC_BE;
 206         priv->wmm.queue_priority[3] = WMM_AC_BK;
 207 }
 208
 209 /*
 210  * This function map ACs to TIDs.
 211  */
 212 static void
 213 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
 214 {
 215         struct mwifiex_wmm_desc *wmm = &priv->wmm;
 216         u8 *queue_priority = wmm->queue_priority;
 217         int i;
 218
 219         for (i = 0; i < 4; ++i) {
 220                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 221                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 222         }
 223
 224         for (i = 0; i < MAX_NUM_TID; ++i)
 225                 priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 226
 227         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 228 }
 229
 230 /*
 231  * This function initializes WMM priority queues.
 232  */
 233 void
 234 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 235                                    struct ieee_types_wmm_parameter *wmm_ie)
 236 {
 237         u16 cw_min, avg_back_off, tmp[4];
 238         u32 i, j, num_ac;
 239         u8 ac_idx;
 240
 241         if (!wmm_ie || !priv->wmm_enabled) {
 242                 /* WMM is not enabled, just set the defaults and return */
 243                 mwifiex_wmm_default_queue_priorities(priv);
 244                 return;
 245         }
 246
 247         mwifiex_dbg(priv->adapter, INFO,
 248                     "info: WMM Parameter IE: version=%d,\t"
 249                     "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 250                     wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 251                     IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 252                     wmm_ie->reserved);
 253
 254         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 255                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 256                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 257                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 258                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 259
 260                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 261                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 262                 tmp[ac_idx] = avg_back_off;
 263
 264                 mwifiex_dbg(priv->adapter, INFO,
 265                             "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 266                             (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 267                             cw_min, avg_back_off);
 268                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 269         }
 270
 271         /* Bubble sort */
 272         for (i = 0; i < num_ac; i++) {
 273                 for (j = 1; j < num_ac - i; j++) {
 274                         if (tmp[j - 1] > tmp[j]) {
 275                                 swap(tmp[j - 1], tmp[j]);
 276                                 swap(priv->wmm.queue_priority[j - 1],
 277                                      priv->wmm.queue_priority[j]);
 278                         } else if (tmp[j - 1] == tmp[j]) {
 279                                 if (priv->wmm.queue_priority[j - 1]
 280                                     < priv->wmm.queue_priority[j])
 281                                         swap(priv->wmm.queue_priority[j - 1],
 282                                              priv->wmm.queue_priority[j]);
 283                         }
 284                 }
 285         }
 286
 287         mwifiex_wmm_queue_priorities_tid(priv);
 288 }
 289
 290 /*
 291  * This function evaluates whether or not an AC is to be downgraded.
 292  *
 293  * In case the AC is not enabled, the highest AC is returned that is
 294  * enabled and does not require admission control.
 295  */
 296 static enum mwifiex_wmm_ac_e
 297 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 298                               enum mwifiex_wmm_ac_e eval_ac)
 299 {
 300         int down_ac;
 301         enum mwifiex_wmm_ac_e ret_ac;
 302         struct mwifiex_wmm_ac_status *ac_status;
 303
 304         ac_status = &priv->wmm.ac_status[eval_ac];
 305
 306         if (!ac_status->disabled)
 307                 /* Okay to use this AC, its enabled */
 308                 return eval_ac;
 309
 310         /* Setup a default return value of the lowest priority */
 311         ret_ac = WMM_AC_BK;
 312
 313         /*
 314          *  Find the highest AC that is enabled and does not require
 315          *  admission control. The spec disallows downgrading to an AC,
 316          *  which is enabled due to a completed admission control.
 317          *  Unadmitted traffic is not to be sent on an AC with admitted
 318          *  traffic.
 319          */
 320         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 321                 ac_status = &priv->wmm.ac_status[down_ac];
 322
 323                 if (!ac_status->disabled && !ac_status->flow_required)
 324                         /* AC is enabled and does not require admission
 325                            control */
 326                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 327         }
 328
 329         return ret_ac;
 330 }
 331
 332 /*
 333  * This function downgrades WMM priority queue.
 334  */
 335 void
 336 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 337 {
 338         int ac_val;
 339
 340         mwifiex_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
 341                     "BK(0), BE(1), VI(2), VO(3)\n");
 342
 343         if (!priv->wmm_enabled) {
 344                 /* WMM is not enabled, default priorities */
 345                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 346                         priv->wmm.ac_down_graded_vals[ac_val] =
 347                                                 (enum mwifiex_wmm_ac_e) ac_val;
 348         } else {
 349                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 350                         priv->wmm.ac_down_graded_vals[ac_val]
 351                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 352                                                 (enum mwifiex_wmm_ac_e) ac_val);
 353                         mwifiex_dbg(priv->adapter, INFO,
 354                                     "info: WMM: AC PRIO %d maps to %d\n",
 355                                     ac_val,
 356                                     priv->wmm.ac_down_graded_vals[ac_val]);
 357                 }
 358         }
 359 }
 360
 361 /*
 362  * This function converts the IP TOS field to an WMM AC
 363  * Queue assignment.
 364  */
 365 static enum mwifiex_wmm_ac_e
 366 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 367 {
 368         /* Map of TOS UP values to WMM AC */
 369         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 370                 WMM_AC_BK,
 371                 WMM_AC_BK,
 372                 WMM_AC_BE,
 373                 WMM_AC_VI,
 374                 WMM_AC_VI,
 375                 WMM_AC_VO,
 376                 WMM_AC_VO
 377         };
 378
 379         if (tos >= ARRAY_SIZE(tos_to_ac))
 380                 return WMM_AC_BE;
 381
 382         return tos_to_ac[tos];
 383 }
 384
 385 /*
 386  * This function evaluates a given TID and downgrades it to a lower
 387  * TID if the WMM Parameter IE received from the AP indicates that the
 388  * AP is disabled (due to call admission control (ACM bit). Mapping
 389  * of TID to AC is taken care of internally.
 390  */
 391 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 392 {
 393         enum mwifiex_wmm_ac_e ac, ac_down;
 394         u8 new_tid;
 395
 396         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 397         ac_down = priv->wmm.ac_down_graded_vals[ac];
 398
 399         /* Send the index to tid array, picking from the array will be
 400          * taken care by dequeuing function
 401          */
 402         new_tid = ac_to_tid[ac_down][tid % 2];
 403
 404         return new_tid;
 405 }
 406
 407 /*
 408  * This function initializes the WMM state information and the
 409  * WMM data path queues.
 410  */
 411 void
 412 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 413 {
 414         int i, j;
 415         struct mwifiex_private *priv;
 416
 417         for (j = 0; j < adapter->priv_num; ++j) {
 418                 priv = adapter->priv[j];
 419                 if (!priv)
 420                         continue;
 421
 422                 for (i = 0; i < MAX_NUM_TID; ++i) {
 423                         if (!disable_tx_amsdu &&
 424                             adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
 425                                 priv->aggr_prio_tbl[i].amsdu =
 426                                                         priv->tos_to_tid_inv[i];
 427                         else
 428                                 priv->aggr_prio_tbl[i].amsdu =
 429                                                         BA_STREAM_NOT_ALLOWED;
 430                         priv->aggr_prio_tbl[i].ampdu_ap =
 431                                                         priv->tos_to_tid_inv[i];
 432                         priv->aggr_prio_tbl[i].ampdu_user =
 433                                                         priv->tos_to_tid_inv[i];
 434                 }
 435
 436                 priv->aggr_prio_tbl[6].amsdu
 437                                         = priv->aggr_prio_tbl[6].ampdu_ap
 438                                         = priv->aggr_prio_tbl[6].ampdu_user
 439                                         = BA_STREAM_NOT_ALLOWED;
 440
 441                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 442                                         = priv->aggr_prio_tbl[7].ampdu_user
 443                                         = BA_STREAM_NOT_ALLOWED;
 444
 445                 mwifiex_set_ba_params(priv);
 446                 mwifiex_reset_11n_rx_seq_num(priv);
 447
 448                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 449                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 450         }
 451 }
 452
 453 int mwifiex_bypass_txlist_empty(struct mwifiex_adapter *adapter)
 454 {
 455         return atomic_read(&adapter->bypass_tx_pending) ? false : true;
 456 }
 457
 458 /*
 459  * This function checks if WMM Tx queue is empty.
 460  */
 461 int
 462 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 463 {
 464         int i;
 465         struct mwifiex_private *priv;
 466
 467         for (i = 0; i < adapter->priv_num; ++i) {
 468                 priv = adapter->priv[i];
 469                 if (priv && !priv->port_open)
 470                         continue;
 471                 if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 472                         return false;
 473         }
 474
 475         return true;
 476 }
 477
 478 /*
 479  * This function deletes all packets in an RA list node.
 480  *
 481  * The packet sent completion callback handler are called with
 482  * status failure, after they are dequeued to ensure proper
 483  * cleanup. The RA list node itself is freed at the end.
 484  */
 485 static void
 486 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 487                                     struct mwifiex_ra_list_tbl *ra_list)
 488 {
 489         struct mwifiex_adapter *adapter = priv->adapter;
 490         struct sk_buff *skb, *tmp;
 491
 492         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 493                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 494 }
 495
 496 /*
 497  * This function deletes all packets in an RA list.
 498  *
 499  * Each nodes in the RA list are freed individually first, and then
 500  * the RA list itself is freed.
 501  */
 502 static void
 503 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 504                                struct list_head *ra_list_head)
 505 {
 506         struct mwifiex_ra_list_tbl *ra_list;
 507
 508         list_for_each_entry(ra_list, ra_list_head, list)
 509                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 510 }
 511
 512 /*
 513  * This function deletes all packets in all RA lists.
 514  */
 515 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 516 {
 517         int i;
 518
 519         for (i = 0; i < MAX_NUM_TID; i++)
 520                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 521                                                                        ra_list);
 522
 523         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 524         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 525 }
 526
 527 /*
 528  * This function deletes all route addresses from all RA lists.
 529  */
 530 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 531 {
 532         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 533         int i;
 534
 535         for (i = 0; i < MAX_NUM_TID; ++i) {
 536                 mwifiex_dbg(priv->adapter, INFO,
 537                             "info: ra_list: freeing buf for tid %d\n", i);
 538                 list_for_each_entry_safe(ra_list, tmp_node,
 539                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 540                                          list) {
 541                         list_del(&ra_list->list);
 542                         kfree(ra_list);
 543                 }
 544
 545                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 546         }
 547 }
 548
 549 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 550 {
 551         pr_warn("Have pending ack frames!\n");
 552         kfree_skb(p);
 553         return 0;
 554 }
 555
 556 /*
 557  * This function cleans up the Tx and Rx queues.
 558  *
 559  * Cleanup includes -
 560  *      - All packets in RA lists
 561  *      - All entries in Rx reorder table
 562  *      - All entries in Tx BA stream table
 563  *      - MPA buffer (if required)
 564  *      - All RA lists
 565  */
 566 void
 567 mwifiex_clean_txrx(struct mwifiex_private *priv)
 568 {
 569         unsigned long flags;
 570         struct sk_buff *skb, *tmp;
 571
 572         mwifiex_11n_cleanup_reorder_tbl(priv);
 573         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 574
 575         mwifiex_wmm_cleanup_queues(priv);
 576         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 577
 578         if (priv->adapter->if_ops.cleanup_mpa_buf)
 579                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 580
 581         mwifiex_wmm_delete_all_ralist(priv);
 582         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 583
 584         if (priv->adapter->if_ops.clean_pcie_ring &&
 585             !priv->adapter->surprise_removed)
 586                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 587         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 588
 589         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 590                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 591
 592         skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
 593                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 594         atomic_set(&priv->adapter->bypass_tx_pending, 0);
 595
 596         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 597         idr_destroy(&priv->ack_status_frames);
 598 }
 599
 600 /*
 601  * This function retrieves a particular RA list node, matching with the
 602  * given TID and RA address.
 603  */
 604 struct mwifiex_ra_list_tbl *
 605 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 606                             const u8 *ra_addr)
 607 {
 608         struct mwifiex_ra_list_tbl *ra_list;
 609
 610         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 611                             list) {
 612                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 613                         return ra_list;
 614         }
 615
 616         return NULL;
 617 }
 618
 619 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
 620                                     u8 tx_pause)
 621 {
 622         struct mwifiex_ra_list_tbl *ra_list;
 623         u32 pkt_cnt = 0, tx_pkts_queued;
 624         unsigned long flags;
 625         int i;
 626
 627         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 628
 629         for (i = 0; i < MAX_NUM_TID; ++i) {
 630                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
 631                 if (ra_list && ra_list->tx_paused != tx_pause) {
 632                         pkt_cnt += ra_list->total_pkt_count;
 633                         ra_list->tx_paused = tx_pause;
 634                         if (tx_pause)
 635                                 priv->wmm.pkts_paused[i] +=
 636                                         ra_list->total_pkt_count;
 637                         else
 638                                 priv->wmm.pkts_paused[i] -=
 639                                         ra_list->total_pkt_count;
 640                 }
 641         }
 642
 643         if (pkt_cnt) {
 644                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 645                 if (tx_pause)
 646                         tx_pkts_queued -= pkt_cnt;
 647                 else
 648                         tx_pkts_queued += pkt_cnt;
 649
 650                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 651                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 652         }
 653         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 654 }
 655
 656 /* This function update non-tdls peer ralist tx_pause while
 657  * tdls channel swithing
 658  */
 659 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
 660                                                u8 *mac, u8 tx_pause)
 661 {
 662         struct mwifiex_ra_list_tbl *ra_list;
 663         u32 pkt_cnt = 0, tx_pkts_queued;
 664         unsigned long flags;
 665         int i;
 666
 667         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 668
 669         for (i = 0; i < MAX_NUM_TID; ++i) {
 670                 list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
 671                                     list) {
 672                         if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 673                                 continue;
 674
 675                         if (ra_list && ra_list->tx_paused != tx_pause) {
 676                                 pkt_cnt += ra_list->total_pkt_count;
 677                                 ra_list->tx_paused = tx_pause;
 678                                 if (tx_pause)
 679                                         priv->wmm.pkts_paused[i] +=
 680                                                 ra_list->total_pkt_count;
 681                                 else
 682                                         priv->wmm.pkts_paused[i] -=
 683                                                 ra_list->total_pkt_count;
 684                         }
 685                 }
 686         }
 687
 688         if (pkt_cnt) {
 689                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 690                 if (tx_pause)
 691                         tx_pkts_queued -= pkt_cnt;
 692                 else
 693                         tx_pkts_queued += pkt_cnt;
 694
 695                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 696                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 697         }
 698         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 699 }
 700
 701 /*
 702  * This function retrieves an RA list node for a given TID and
 703  * RA address pair.
 704  *
 705  * If no such node is found, a new node is added first and then
 706  * retrieved.
 707  */
 708 struct mwifiex_ra_list_tbl *
 709 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 710                             const u8 *ra_addr)
 711 {
 712         struct mwifiex_ra_list_tbl *ra_list;
 713
 714         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 715         if (ra_list)
 716                 return ra_list;
 717         mwifiex_ralist_add(priv, ra_addr);
 718
 719         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 720 }
 721
 722 /*
 723  * This function deletes RA list nodes for given mac for all TIDs.
 724  * Function also decrements TX pending count accordingly.
 725  */
 726 void
 727 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 728 {
 729         struct mwifiex_ra_list_tbl *ra_list;
 730         unsigned long flags;
 731         int i;
 732
 733         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 734
 735         for (i = 0; i < MAX_NUM_TID; ++i) {
 736                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 737
 738                 if (!ra_list)
 739                         continue;
 740                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 741                 if (ra_list->tx_paused)
 742                         priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
 743                 else
 744                         atomic_sub(ra_list->total_pkt_count,
 745                                    &priv->wmm.tx_pkts_queued);
 746                 list_del(&ra_list->list);
 747                 kfree(ra_list);
 748         }
 749         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 750 }
 751
 752 /*
 753  * This function checks if a particular RA list node exists in a given TID
 754  * table index.
 755  */
 756 int
 757 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 758                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 759 {
 760         struct mwifiex_ra_list_tbl *rlist;
 761
 762         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 763                             list) {
 764                 if (rlist == ra_list)
 765                         return true;
 766         }
 767
 768         return false;
 769 }
 770
 771 /*
 772  * This function adds a packet to bypass TX queue.
 773  * This is special TX queue for packets which can be sent even when port_open
 774  * is false.
 775  */
 776 void
 777 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
 778                                    struct sk_buff *skb)
 779 {
 780         skb_queue_tail(&priv->bypass_txq, skb);
 781 }
 782
 783 /*
 784  * This function adds a packet to WMM queue.
 785  *
 786  * In disconnected state the packet is immediately dropped and the
 787  * packet send completion callback is called with status failure.
 788  *
 789  * Otherwise, the correct RA list node is located and the packet
 790  * is queued at the list tail.
 791  */
 792 void
 793 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 794                             struct sk_buff *skb)
 795 {
 796         struct mwifiex_adapter *adapter = priv->adapter;
 797         u32 tid;
 798         struct mwifiex_ra_list_tbl *ra_list;
 799         u8 ra[ETH_ALEN], tid_down;
 800         unsigned long flags;
 801         struct list_head list_head;
 802         int tdls_status = TDLS_NOT_SETUP;
 803         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 804         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 805
 806         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 807
 808         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 809             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 810                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 811                         mwifiex_dbg(adapter, DATA,
 812                                     "TDLS setup packet for %pM.\t"
 813                                     "Don't block\n", ra);
 814                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 815                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 816         }
 817
 818         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 819                 mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
 820                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 821                 return;
 822         }
 823
 824         tid = skb->priority;
 825
 826         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 827
 828         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 829
 830         /* In case of infra as we have already created the list during
 831            association we just don't have to call get_queue_raptr, we will
 832            have only 1 raptr for a tid in case of infra */
 833         if (!mwifiex_queuing_ra_based(priv) &&
 834             !mwifiex_is_skb_mgmt_frame(skb)) {
 835                 switch (tdls_status) {
 836                 case TDLS_SETUP_COMPLETE:
 837                 case TDLS_CHAN_SWITCHING:
 838                 case TDLS_IN_BASE_CHAN:
 839                 case TDLS_IN_OFF_CHAN:
 840                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 841                                                               ra);
 842                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 843                         break;
 844                 case TDLS_SETUP_INPROGRESS:
 845                         skb_queue_tail(&priv->tdls_txq, skb);
 846                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 847                                                flags);
 848                         return;
 849                 default:
 850                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 851                         if (!list_empty(&list_head))
 852                                 ra_list = list_first_entry(
 853                                         &list_head, struct mwifiex_ra_list_tbl,
 854                                         list);
 855                         else
 856                                 ra_list = NULL;
 857                         break;
 858                 }
 859         } else {
 860                 memcpy(ra, skb->data, ETH_ALEN);
 861                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 862                         eth_broadcast_addr(ra);
 863                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 864         }
 865
 866         if (!ra_list) {
 867                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 868                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 869                 return;
 870         }
 871
 872         skb_queue_tail(&ra_list->skb_head, skb);
 873
 874         ra_list->ba_pkt_count++;
 875         ra_list->total_pkt_count++;
 876
 877         if (atomic_read(&priv->wmm.highest_queued_prio) <
 878                                                 priv->tos_to_tid_inv[tid_down])
 879                 atomic_set(&priv->wmm.highest_queued_prio,
 880                            priv->tos_to_tid_inv[tid_down]);
 881
 882         if (ra_list->tx_paused)
 883                 priv->wmm.pkts_paused[tid_down]++;
 884         else
 885                 atomic_inc(&priv->wmm.tx_pkts_queued);
 886
 887         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 888 }
 889
 890 /*
 891  * This function processes the get WMM status command response from firmware.
 892  *
 893  * The response may contain multiple TLVs -
 894  *      - AC Queue status TLVs
 895  *      - Current WMM Parameter IE TLV
 896  *      - Admission Control action frame TLVs
 897  *
 898  * This function parses the TLVs and then calls further specific functions
 899  * to process any changes in the queue prioritize or state.
 900  */
 901 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 902                                const struct host_cmd_ds_command *resp)
 903 {
 904         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 905         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 906         int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
 907         bool valid = true;
 908
 909         struct mwifiex_ie_types_data *tlv_hdr;
 910         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 911         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 912         struct mwifiex_wmm_ac_status *ac_status;
 913
 914         mwifiex_dbg(priv->adapter, INFO,
 915                     "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 916                     resp_len);
 917
 918         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 919                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 920                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 921
 922                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 923                         break;
 924
 925                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 926                 case TLV_TYPE_WMMQSTATUS:
 927                         tlv_wmm_qstatus =
 928                                 (struct mwifiex_ie_types_wmm_queue_status *)
 929                                 tlv_hdr;
 930                         mwifiex_dbg(priv->adapter, CMD,
 931                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 932                                     "QSTATUS TLV: %d, %d, %d\n",
 933                                     tlv_wmm_qstatus->queue_index,
 934                                     tlv_wmm_qstatus->flow_required,
 935                                     tlv_wmm_qstatus->disabled);
 936
 937                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 938                                                          queue_index];
 939                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 940                         ac_status->flow_required =
 941                                                 tlv_wmm_qstatus->flow_required;
 942                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 943                         break;
 944
 945                 case WLAN_EID_VENDOR_SPECIFIC:
 946                         /*
 947                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 948                          *   and setup the IEEE IE type and length byte fields
 949                          */
 950
 951                         wmm_param_ie =
 952                                 (struct ieee_types_wmm_parameter *) (curr +
 953                                                                     2);
 954                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 955                         wmm_param_ie->vend_hdr.element_id =
 956                                                 WLAN_EID_VENDOR_SPECIFIC;
 957
 958                         mwifiex_dbg(priv->adapter, CMD,
 959                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 960                                     "WMM Parameter Set Count: %d\n",
 961                                     wmm_param_ie->qos_info_bitmap & mask);
 962
 963                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 964                                wmm_ie, wmm_param_ie,
 965                                wmm_param_ie->vend_hdr.len + 2);
 966
 967                         break;
 968
 969                 default:
 970                         valid = false;
 971                         break;
 972                 }
 973
 974                 curr += (tlv_len + sizeof(tlv_hdr->header));
 975                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 976         }
 977
 978         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 979         mwifiex_wmm_setup_ac_downgrade(priv);
 980
 981         return 0;
 982 }
 983
 984 /*
 985  * Callback handler from the command module to allow insertion of a WMM TLV.
 986  *
 987  * If the BSS we are associating to supports WMM, this function adds the
 988  * required WMM Information IE to the association request command buffer in
 989  * the form of a Marvell extended IEEE IE.
 990  */
 991 u32
 992 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 993                                     u8 **assoc_buf,
 994                                     struct ieee_types_wmm_parameter *wmm_ie,
 995                                     struct ieee80211_ht_cap *ht_cap)
 996 {
 997         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 998         u32 ret_len = 0;
 999
1000         /* Null checks */
1001         if (!assoc_buf)
1002                 return 0;
1003         if (!(*assoc_buf))
1004                 return 0;
1005
1006         if (!wmm_ie)
1007                 return 0;
1008
1009         mwifiex_dbg(priv->adapter, INFO,
1010                     "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1011                     wmm_ie->vend_hdr.element_id);
1012
1013         if ((priv->wmm_required ||
1014              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1015              priv->adapter->config_bands & BAND_AN))) &&
1016             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1017                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1018                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1019                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1020                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1021                        le16_to_cpu(wmm_tlv->header.len));
1022                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1023                         memcpy((u8 *) (wmm_tlv->wmm_ie
1024                                        + le16_to_cpu(wmm_tlv->header.len)
1025                                        - sizeof(priv->wmm_qosinfo)),
1026                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1027
1028                 ret_len = sizeof(wmm_tlv->header)
1029                           + le16_to_cpu(wmm_tlv->header.len);
1030
1031                 *assoc_buf += ret_len;
1032         }
1033
1034         return ret_len;
1035 }
1036
1037 /*
1038  * This function computes the time delay in the driver queues for a
1039  * given packet.
1040  *
1041  * When the packet is received at the OS/Driver interface, the current
1042  * time is set in the packet structure. The difference between the present
1043  * time and that received time is computed in this function and limited
1044  * based on pre-compiled limits in the driver.
1045  */
1046 u8
1047 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1048                                   const struct sk_buff *skb)
1049 {
1050         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1051         u8 ret_val;
1052
1053         /*
1054          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1055          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1056          *
1057          * Pass max value if queue_delay is beyond the uint8 range
1058          */
1059         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1060
1061         mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1062                     "%d ms sent to FW\n", queue_delay, ret_val);
1063
1064         return ret_val;
1065 }
1066
1067 /*
1068  * This function retrieves the highest priority RA list table pointer.
1069  */
1070 static struct mwifiex_ra_list_tbl *
1071 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1072                                      struct mwifiex_private **priv, int *tid)
1073 {
1074         struct mwifiex_private *priv_tmp;
1075         struct mwifiex_ra_list_tbl *ptr;
1076         struct mwifiex_tid_tbl *tid_ptr;
1077         atomic_t *hqp;
1078         unsigned long flags_ra;
1079         int i, j;
1080
1081         /* check the BSS with highest priority first */
1082         for (j = adapter->priv_num - 1; j >= 0; --j) {
1083                 /* iterate over BSS with the equal priority */
1084                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1085                                     &adapter->bss_prio_tbl[j].bss_prio_head,
1086                                     list) {
1087
1088                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1089
1090                         if (!priv_tmp->port_open ||
1091                             (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1092                                 continue;
1093
1094                         /* iterate over the WMM queues of the BSS */
1095                         hqp = &priv_tmp->wmm.highest_queued_prio;
1096                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1097
1098                                 spin_lock_irqsave(&priv_tmp->wmm.
1099                                                   ra_list_spinlock, flags_ra);
1100
1101                                 tid_ptr = &(priv_tmp)->wmm.
1102                                         tid_tbl_ptr[tos_to_tid[i]];
1103
1104                                 /* iterate over receiver addresses */
1105                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1106                                                     list) {
1107
1108                                         if (!ptr->tx_paused &&
1109                                             !skb_queue_empty(&ptr->skb_head))
1110                                                 /* holds both locks */
1111                                                 goto found;
1112                                 }
1113
1114                                 spin_unlock_irqrestore(&priv_tmp->wmm.
1115                                                        ra_list_spinlock,
1116                                                        flags_ra);
1117                         }
1118                 }
1119
1120         }
1121
1122         return NULL;
1123
1124 found:
1125         /* holds ra_list_spinlock */
1126         if (atomic_read(hqp) > i)
1127                 atomic_set(hqp, i);
1128         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1129
1130         *priv = priv_tmp;
1131         *tid = tos_to_tid[i];
1132
1133         return ptr;
1134 }
1135
1136 /* This functions rotates ra and bss lists so packets are picked round robin.
1137  *
1138  * After a packet is successfully transmitted, rotate the ra list, so the ra
1139  * next to the one transmitted, will come first in the list. This way we pick
1140  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1141  * priority.
1142  *
1143  * Function also increments wmm.packets_out counter.
1144  */
1145 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1146                                  struct mwifiex_ra_list_tbl *ra,
1147                                  int tid)
1148 {
1149         struct mwifiex_adapter *adapter = priv->adapter;
1150         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1151         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1152         unsigned long flags;
1153
1154         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1155         /*
1156          * dirty trick: we remove 'head' temporarily and reinsert it after
1157          * curr bss node. imagine list to stay fixed while head is moved
1158          */
1159         list_move(&tbl[priv->bss_priority].bss_prio_head,
1160                   &tbl[priv->bss_priority].bss_prio_cur->list);
1161         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1162
1163         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1164         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1165                 priv->wmm.packets_out[tid]++;
1166                 /* same as above */
1167                 list_move(&tid_ptr->ra_list, &ra->list);
1168         }
1169         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1170 }
1171
1172 /*
1173  * This function checks if 11n aggregation is possible.
1174  */
1175 static int
1176 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1177                                     struct mwifiex_ra_list_tbl *ptr,
1178                                     int max_buf_size)
1179 {
1180         int count = 0, total_size = 0;
1181         struct sk_buff *skb, *tmp;
1182         int max_amsdu_size;
1183
1184         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1185             ptr->is_11n_enabled)
1186                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1187         else
1188                 max_amsdu_size = max_buf_size;
1189
1190         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1191                 total_size += skb->len;
1192                 if (total_size >= max_amsdu_size)
1193                         break;
1194                 if (++count >= MIN_NUM_AMSDU)
1195                         return true;
1196         }
1197
1198         return false;
1199 }
1200
1201 /*
1202  * This function sends a single packet to firmware for transmission.
1203  */
1204 static void
1205 mwifiex_send_single_packet(struct mwifiex_private *priv,
1206                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1207                            unsigned long ra_list_flags)
1208                            __releases(&priv->wmm.ra_list_spinlock)
1209 {
1210         struct sk_buff *skb, *skb_next;
1211         struct mwifiex_tx_param tx_param;
1212         struct mwifiex_adapter *adapter = priv->adapter;
1213         struct mwifiex_txinfo *tx_info;
1214
1215         if (skb_queue_empty(&ptr->skb_head)) {
1216                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1217                                        ra_list_flags);
1218                 mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1219                 return;
1220         }
1221
1222         skb = skb_dequeue(&ptr->skb_head);
1223
1224         tx_info = MWIFIEX_SKB_TXCB(skb);
1225         mwifiex_dbg(adapter, DATA,
1226                     "data: dequeuing the packet %p %p\n", ptr, skb);
1227
1228         ptr->total_pkt_count--;
1229
1230         if (!skb_queue_empty(&ptr->skb_head))
1231                 skb_next = skb_peek(&ptr->skb_head);
1232         else
1233                 skb_next = NULL;
1234
1235         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1236
1237         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1238                                 sizeof(struct txpd) : 0);
1239
1240         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1241                 /* Queue the packet back at the head */
1242                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1243
1244                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1245                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1246                                                ra_list_flags);
1247                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1248                         return;
1249                 }
1250
1251                 skb_queue_tail(&ptr->skb_head, skb);
1252
1253                 ptr->total_pkt_count++;
1254                 ptr->ba_pkt_count++;
1255                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1256                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1257                                        ra_list_flags);
1258         } else {
1259                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1260                 atomic_dec(&priv->wmm.tx_pkts_queued);
1261         }
1262 }
1263
1264 /*
1265  * This function checks if the first packet in the given RA list
1266  * is already processed or not.
1267  */
1268 static int
1269 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1270                          struct mwifiex_ra_list_tbl *ptr)
1271 {
1272         struct sk_buff *skb;
1273         struct mwifiex_txinfo *tx_info;
1274
1275         if (skb_queue_empty(&ptr->skb_head))
1276                 return false;
1277
1278         skb = skb_peek(&ptr->skb_head);
1279
1280         tx_info = MWIFIEX_SKB_TXCB(skb);
1281         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1282                 return true;
1283
1284         return false;
1285 }
1286
1287 /*
1288  * This function sends a single processed packet to firmware for
1289  * transmission.
1290  */
1291 static void
1292 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1293                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1294                               unsigned long ra_list_flags)
1295                                 __releases(&priv->wmm.ra_list_spinlock)
1296 {
1297         struct mwifiex_tx_param tx_param;
1298         struct mwifiex_adapter *adapter = priv->adapter;
1299         int ret = -1;
1300         struct sk_buff *skb, *skb_next;
1301         struct mwifiex_txinfo *tx_info;
1302
1303         if (skb_queue_empty(&ptr->skb_head)) {
1304                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1305                                        ra_list_flags);
1306                 return;
1307         }
1308
1309         skb = skb_dequeue(&ptr->skb_head);
1310
1311         if (adapter->data_sent || adapter->tx_lock_flag) {
1312                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1313                                        ra_list_flags);
1314                 skb_queue_tail(&adapter->tx_data_q, skb);
1315                 atomic_inc(&adapter->tx_queued);
1316                 return;
1317         }
1318
1319         if (!skb_queue_empty(&ptr->skb_head))
1320                 skb_next = skb_peek(&ptr->skb_head);
1321         else
1322                 skb_next = NULL;
1323
1324         tx_info = MWIFIEX_SKB_TXCB(skb);
1325
1326         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1327
1328         if (adapter->iface_type == MWIFIEX_USB) {
1329                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1330                                                    skb, NULL);
1331         } else {
1332                 tx_param.next_pkt_len =
1333                         ((skb_next) ? skb_next->len +
1334                          sizeof(struct txpd) : 0);
1335                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1336                                                    skb, &tx_param);
1337         }
1338
1339         switch (ret) {
1340         case -EBUSY:
1341                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1342                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1343
1344                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1345                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1346                                                ra_list_flags);
1347                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1348                         return;
1349                 }
1350
1351                 skb_queue_tail(&ptr->skb_head, skb);
1352
1353                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1354                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1355                                        ra_list_flags);
1356                 break;
1357         case -1:
1358                 mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1359                 adapter->dbg.num_tx_host_to_card_failure++;
1360                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1361                 break;
1362         case -EINPROGRESS:
1363                 break;
1364         case 0:
1365                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1366         default:
1367                 break;
1368         }
1369         if (ret != -EBUSY) {
1370                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1371                 atomic_dec(&priv->wmm.tx_pkts_queued);
1372         }
1373 }
1374
1375 /*
1376  * This function dequeues a packet from the highest priority list
1377  * and transmits it.
1378  */
1379 static int
1380 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1381 {
1382         struct mwifiex_ra_list_tbl *ptr;
1383         struct mwifiex_private *priv = NULL;
1384         int ptr_index = 0;
1385         u8 ra[ETH_ALEN];
1386         int tid_del = 0, tid = 0;
1387         unsigned long flags;
1388
1389         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1390         if (!ptr)
1391                 return -1;
1392
1393         tid = mwifiex_get_tid(ptr);
1394
1395         mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1396
1397         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1398         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1399                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1400                 return -1;
1401         }
1402
1403         if (mwifiex_is_ptr_processed(priv, ptr)) {
1404                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1405                 /* ra_list_spinlock has been freed in
1406                    mwifiex_send_processed_packet() */
1407                 return 0;
1408         }
1409
1410         if (!ptr->is_11n_enabled ||
1411                 ptr->ba_status ||
1412                 priv->wps.session_enable) {
1413                 if (ptr->is_11n_enabled &&
1414                         ptr->ba_status &&
1415                         ptr->amsdu_in_ampdu &&
1416                         mwifiex_is_amsdu_allowed(priv, tid) &&
1417                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1418                                                         adapter->tx_buf_size))
1419                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1420                         /* ra_list_spinlock has been freed in
1421                          * mwifiex_11n_aggregate_pkt()
1422                          */
1423                 else
1424                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1425                         /* ra_list_spinlock has been freed in
1426                          * mwifiex_send_single_packet()
1427                          */
1428         } else {
1429                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1430                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1431                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1432                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1433                                                       BA_SETUP_INPROGRESS);
1434                                 mwifiex_send_addba(priv, tid, ptr->ra);
1435                         } else if (mwifiex_find_stream_to_delete
1436                                    (priv, tid, &tid_del, ra)) {
1437                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1438                                                       BA_SETUP_INPROGRESS);
1439                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1440                         }
1441                 }
1442                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1443                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1444                                                         adapter->tx_buf_size))
1445                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1446                         /* ra_list_spinlock has been freed in
1447                            mwifiex_11n_aggregate_pkt() */
1448                 else
1449                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1450                         /* ra_list_spinlock has been freed in
1451                            mwifiex_send_single_packet() */
1452         }
1453         return 0;
1454 }
1455
1456 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1457 {
1458         struct mwifiex_tx_param tx_param;
1459         struct sk_buff *skb;
1460         struct mwifiex_txinfo *tx_info;
1461         struct mwifiex_private *priv;
1462         int i;
1463
1464         if (adapter->data_sent || adapter->tx_lock_flag)
1465                 return;
1466
1467         for (i = 0; i < adapter->priv_num; ++i) {
1468                 priv = adapter->priv[i];
1469
1470                 if (skb_queue_empty(&priv->bypass_txq))
1471                         continue;
1472
1473                 skb = skb_dequeue(&priv->bypass_txq);
1474                 tx_info = MWIFIEX_SKB_TXCB(skb);
1475
1476                 /* no aggregation for bypass packets */
1477                 tx_param.next_pkt_len = 0;
1478
1479                 if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1480                         skb_queue_head(&priv->bypass_txq, skb);
1481                         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1482                 } else {
1483                         atomic_dec(&adapter->bypass_tx_pending);
1484                 }
1485         }
1486 }
1487
1488 /*
1489  * This function transmits the highest priority packet awaiting in the
1490  * WMM Queues.
1491  */
1492 void
1493 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1494 {
1495         do {
1496                 if (mwifiex_dequeue_tx_packet(adapter))
1497                         break;
1498                 if (adapter->iface_type != MWIFIEX_SDIO) {
1499                         if (adapter->data_sent ||
1500                             adapter->tx_lock_flag)
1501                                 break;
1502                 } else {
1503                         if (atomic_read(&adapter->tx_queued) >=
1504                             MWIFIEX_MAX_PKTS_TXQ)
1505                                 break;
1506                 }
1507         } while (!mwifiex_wmm_lists_empty(adapter));
1508 }