drivers/net/wireless/marvell/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         u64 ns;
 121         /* setup ba_packet_threshold here random number between
 122          * [BA_SETUP_PACKET_OFFSET,
 123          * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
 124          */
 125         ns = ktime_get_ns();
 126         ns += (ns >> 32) + (ns >> 16);
 127
 128         return ((u8)ns % BA_SETUP_MAX_PACKET_THRESHOLD) + BA_SETUP_PACKET_OFFSET;
 129 }
 130
 131 /*
 132  * This function allocates and adds a RA list for all TIDs
 133  * with the given RA.
 134  */
 135 void mwifiex_ralist_add(struct mwifiex_private *priv, const u8 *ra)
 136 {
 137         int i;
 138         struct mwifiex_ra_list_tbl *ra_list;
 139         struct mwifiex_adapter *adapter = priv->adapter;
 140         struct mwifiex_sta_node *node;
 141         unsigned long flags;
 142
 143
 144         for (i = 0; i < MAX_NUM_TID; ++i) {
 145                 ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 146                 mwifiex_dbg(adapter, INFO,
 147                             "info: created ra_list %p\n", ra_list);
 148
 149                 if (!ra_list)
 150                         break;
 151
 152                 ra_list->is_11n_enabled = 0;
 153                 ra_list->tdls_link = false;
 154                 ra_list->ba_status = BA_SETUP_NONE;
 155                 ra_list->amsdu_in_ampdu = false;
 156                 if (!mwifiex_queuing_ra_based(priv)) {
 157                         if (mwifiex_is_tdls_link_setup
 158                                 (mwifiex_get_tdls_link_status(priv, ra))) {
 159                                 ra_list->tdls_link = true;
 160                                 ra_list->is_11n_enabled =
 161                                         mwifiex_tdls_peer_11n_enabled(priv, ra);
 162                         } else {
 163                                 ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 164                         }
 165                 } else {
 166                         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 167                         node = mwifiex_get_sta_entry(priv, ra);
 168                         if (node)
 169                                 ra_list->tx_paused = node->tx_pause;
 170                         ra_list->is_11n_enabled =
 171                                       mwifiex_is_sta_11n_enabled(priv, node);
 172                         if (ra_list->is_11n_enabled)
 173                                 ra_list->max_amsdu = node->max_amsdu;
 174                         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 175                 }
 176
 177                 mwifiex_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
 178                             ra_list, ra_list->is_11n_enabled);
 179
 180                 if (ra_list->is_11n_enabled) {
 181                         ra_list->ba_pkt_count = 0;
 182                         ra_list->ba_packet_thr =
 183                                               mwifiex_get_random_ba_threshold();
 184                 }
 185                 list_add_tail(&ra_list->list,
 186                               &priv->wmm.tid_tbl_ptr[i].ra_list);
 187         }
 188 }
 189
 190 /*
 191  * This function sets the WMM queue priorities to their default values.
 192  */
 193 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 194 {
 195         /* Default queue priorities: VO->VI->BE->BK */
 196         priv->wmm.queue_priority[0] = WMM_AC_VO;
 197         priv->wmm.queue_priority[1] = WMM_AC_VI;
 198         priv->wmm.queue_priority[2] = WMM_AC_BE;
 199         priv->wmm.queue_priority[3] = WMM_AC_BK;
 200 }
 201
 202 /*
 203  * This function map ACs to TIDs.
 204  */
 205 static void
 206 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
 207 {
 208         struct mwifiex_wmm_desc *wmm = &priv->wmm;
 209         u8 *queue_priority = wmm->queue_priority;
 210         int i;
 211
 212         for (i = 0; i < 4; ++i) {
 213                 tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 214                 tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 215         }
 216
 217         for (i = 0; i < MAX_NUM_TID; ++i)
 218                 priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 219
 220         atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 221 }
 222
 223 /*
 224  * This function initializes WMM priority queues.
 225  */
 226 void
 227 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 228                                    struct ieee_types_wmm_parameter *wmm_ie)
 229 {
 230         u16 cw_min, avg_back_off, tmp[4];
 231         u32 i, j, num_ac;
 232         u8 ac_idx;
 233
 234         if (!wmm_ie || !priv->wmm_enabled) {
 235                 /* WMM is not enabled, just set the defaults and return */
 236                 mwifiex_wmm_default_queue_priorities(priv);
 237                 return;
 238         }
 239
 240         mwifiex_dbg(priv->adapter, INFO,
 241                     "info: WMM Parameter IE: version=%d,\t"
 242                     "qos_info Parameter Set Count=%d, Reserved=%#x\n",
 243                     wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 244                     IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 245                     wmm_ie->reserved);
 246
 247         for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 248                 u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 249                 u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 250                 cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 251                 avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 252
 253                 ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 254                 priv->wmm.queue_priority[ac_idx] = ac_idx;
 255                 tmp[ac_idx] = avg_back_off;
 256
 257                 mwifiex_dbg(priv->adapter, INFO,
 258                             "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 259                             (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 260                             cw_min, avg_back_off);
 261                 mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 262         }
 263
 264         /* Bubble sort */
 265         for (i = 0; i < num_ac; i++) {
 266                 for (j = 1; j < num_ac - i; j++) {
 267                         if (tmp[j - 1] > tmp[j]) {
 268                                 swap(tmp[j - 1], tmp[j]);
 269                                 swap(priv->wmm.queue_priority[j - 1],
 270                                      priv->wmm.queue_priority[j]);
 271                         } else if (tmp[j - 1] == tmp[j]) {
 272                                 if (priv->wmm.queue_priority[j - 1]
 273                                     < priv->wmm.queue_priority[j])
 274                                         swap(priv->wmm.queue_priority[j - 1],
 275                                              priv->wmm.queue_priority[j]);
 276                         }
 277                 }
 278         }
 279
 280         mwifiex_wmm_queue_priorities_tid(priv);
 281 }
 282
 283 /*
 284  * This function evaluates whether or not an AC is to be downgraded.
 285  *
 286  * In case the AC is not enabled, the highest AC is returned that is
 287  * enabled and does not require admission control.
 288  */
 289 static enum mwifiex_wmm_ac_e
 290 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 291                               enum mwifiex_wmm_ac_e eval_ac)
 292 {
 293         int down_ac;
 294         enum mwifiex_wmm_ac_e ret_ac;
 295         struct mwifiex_wmm_ac_status *ac_status;
 296
 297         ac_status = &priv->wmm.ac_status[eval_ac];
 298
 299         if (!ac_status->disabled)
 300                 /* Okay to use this AC, its enabled */
 301                 return eval_ac;
 302
 303         /* Setup a default return value of the lowest priority */
 304         ret_ac = WMM_AC_BK;
 305
 306         /*
 307          *  Find the highest AC that is enabled and does not require
 308          *  admission control. The spec disallows downgrading to an AC,
 309          *  which is enabled due to a completed admission control.
 310          *  Unadmitted traffic is not to be sent on an AC with admitted
 311          *  traffic.
 312          */
 313         for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 314                 ac_status = &priv->wmm.ac_status[down_ac];
 315
 316                 if (!ac_status->disabled && !ac_status->flow_required)
 317                         /* AC is enabled and does not require admission
 318                            control */
 319                         ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 320         }
 321
 322         return ret_ac;
 323 }
 324
 325 /*
 326  * This function downgrades WMM priority queue.
 327  */
 328 void
 329 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 330 {
 331         int ac_val;
 332
 333         mwifiex_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
 334                     "BK(0), BE(1), VI(2), VO(3)\n");
 335
 336         if (!priv->wmm_enabled) {
 337                 /* WMM is not enabled, default priorities */
 338                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 339                         priv->wmm.ac_down_graded_vals[ac_val] =
 340                                                 (enum mwifiex_wmm_ac_e) ac_val;
 341         } else {
 342                 for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 343                         priv->wmm.ac_down_graded_vals[ac_val]
 344                                 = mwifiex_wmm_eval_downgrade_ac(priv,
 345                                                 (enum mwifiex_wmm_ac_e) ac_val);
 346                         mwifiex_dbg(priv->adapter, INFO,
 347                                     "info: WMM: AC PRIO %d maps to %d\n",
 348                                     ac_val,
 349                                     priv->wmm.ac_down_graded_vals[ac_val]);
 350                 }
 351         }
 352 }
 353
 354 /*
 355  * This function converts the IP TOS field to an WMM AC
 356  * Queue assignment.
 357  */
 358 static enum mwifiex_wmm_ac_e
 359 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 360 {
 361         /* Map of TOS UP values to WMM AC */
 362         const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 363                 WMM_AC_BK,
 364                 WMM_AC_BK,
 365                 WMM_AC_BE,
 366                 WMM_AC_VI,
 367                 WMM_AC_VI,
 368                 WMM_AC_VO,
 369                 WMM_AC_VO
 370         };
 371
 372         if (tos >= ARRAY_SIZE(tos_to_ac))
 373                 return WMM_AC_BE;
 374
 375         return tos_to_ac[tos];
 376 }
 377
 378 /*
 379  * This function evaluates a given TID and downgrades it to a lower
 380  * TID if the WMM Parameter IE received from the AP indicates that the
 381  * AP is disabled (due to call admission control (ACM bit). Mapping
 382  * of TID to AC is taken care of internally.
 383  */
 384 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 385 {
 386         enum mwifiex_wmm_ac_e ac, ac_down;
 387         u8 new_tid;
 388
 389         ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 390         ac_down = priv->wmm.ac_down_graded_vals[ac];
 391
 392         /* Send the index to tid array, picking from the array will be
 393          * taken care by dequeuing function
 394          */
 395         new_tid = ac_to_tid[ac_down][tid % 2];
 396
 397         return new_tid;
 398 }
 399
 400 /*
 401  * This function initializes the WMM state information and the
 402  * WMM data path queues.
 403  */
 404 void
 405 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 406 {
 407         int i, j;
 408         struct mwifiex_private *priv;
 409
 410         for (j = 0; j < adapter->priv_num; ++j) {
 411                 priv = adapter->priv[j];
 412                 if (!priv)
 413                         continue;
 414
 415                 for (i = 0; i < MAX_NUM_TID; ++i) {
 416                         if (!disable_tx_amsdu &&
 417                             adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
 418                                 priv->aggr_prio_tbl[i].amsdu =
 419                                                         priv->tos_to_tid_inv[i];
 420                         else
 421                                 priv->aggr_prio_tbl[i].amsdu =
 422                                                         BA_STREAM_NOT_ALLOWED;
 423                         priv->aggr_prio_tbl[i].ampdu_ap =
 424                                                         priv->tos_to_tid_inv[i];
 425                         priv->aggr_prio_tbl[i].ampdu_user =
 426                                                         priv->tos_to_tid_inv[i];
 427                 }
 428
 429                 priv->aggr_prio_tbl[6].amsdu
 430                                         = priv->aggr_prio_tbl[6].ampdu_ap
 431                                         = priv->aggr_prio_tbl[6].ampdu_user
 432                                         = BA_STREAM_NOT_ALLOWED;
 433
 434                 priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 435                                         = priv->aggr_prio_tbl[7].ampdu_user
 436                                         = BA_STREAM_NOT_ALLOWED;
 437
 438                 mwifiex_set_ba_params(priv);
 439                 mwifiex_reset_11n_rx_seq_num(priv);
 440
 441                 priv->wmm.drv_pkt_delay_max = MWIFIEX_WMM_DRV_DELAY_MAX;
 442                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 443                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 444         }
 445 }
 446
 447 int mwifiex_bypass_txlist_empty(struct mwifiex_adapter *adapter)
 448 {
 449         struct mwifiex_private *priv;
 450         int i;
 451
 452         for (i = 0; i < adapter->priv_num; i++) {
 453                 priv = adapter->priv[i];
 454                 if (!priv)
 455                         continue;
 456                 if (adapter->if_ops.is_port_ready &&
 457                     !adapter->if_ops.is_port_ready(priv))
 458                         continue;
 459                 if (!skb_queue_empty(&priv->bypass_txq))
 460                         return false;
 461         }
 462
 463         return true;
 464 }
 465
 466 /*
 467  * This function checks if WMM Tx queue is empty.
 468  */
 469 int
 470 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 471 {
 472         int i;
 473         struct mwifiex_private *priv;
 474
 475         for (i = 0; i < adapter->priv_num; ++i) {
 476                 priv = adapter->priv[i];
 477                 if (!priv)
 478                         continue;
 479                 if (!priv->port_open &&
 480                     (priv->bss_mode != NL80211_IFTYPE_ADHOC))
 481                         continue;
 482                 if (adapter->if_ops.is_port_ready &&
 483                     !adapter->if_ops.is_port_ready(priv))
 484                         continue;
 485                 if (atomic_read(&priv->wmm.tx_pkts_queued))
 486                         return false;
 487         }
 488
 489         return true;
 490 }
 491
 492 /*
 493  * This function deletes all packets in an RA list node.
 494  *
 495  * The packet sent completion callback handler are called with
 496  * status failure, after they are dequeued to ensure proper
 497  * cleanup. The RA list node itself is freed at the end.
 498  */
 499 static void
 500 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 501                                     struct mwifiex_ra_list_tbl *ra_list)
 502 {
 503         struct mwifiex_adapter *adapter = priv->adapter;
 504         struct sk_buff *skb, *tmp;
 505
 506         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 507                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 508 }
 509
 510 /*
 511  * This function deletes all packets in an RA list.
 512  *
 513  * Each nodes in the RA list are freed individually first, and then
 514  * the RA list itself is freed.
 515  */
 516 static void
 517 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 518                                struct list_head *ra_list_head)
 519 {
 520         struct mwifiex_ra_list_tbl *ra_list;
 521
 522         list_for_each_entry(ra_list, ra_list_head, list)
 523                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 524 }
 525
 526 /*
 527  * This function deletes all packets in all RA lists.
 528  */
 529 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 530 {
 531         int i;
 532
 533         for (i = 0; i < MAX_NUM_TID; i++)
 534                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 535                                                                        ra_list);
 536
 537         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 538         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 539 }
 540
 541 /*
 542  * This function deletes all route addresses from all RA lists.
 543  */
 544 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 545 {
 546         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 547         int i;
 548
 549         for (i = 0; i < MAX_NUM_TID; ++i) {
 550                 mwifiex_dbg(priv->adapter, INFO,
 551                             "info: ra_list: freeing buf for tid %d\n", i);
 552                 list_for_each_entry_safe(ra_list, tmp_node,
 553                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 554                                          list) {
 555                         list_del(&ra_list->list);
 556                         kfree(ra_list);
 557                 }
 558
 559                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 560         }
 561 }
 562
 563 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 564 {
 565         pr_warn("Have pending ack frames!\n");
 566         kfree_skb(p);
 567         return 0;
 568 }
 569
 570 /*
 571  * This function cleans up the Tx and Rx queues.
 572  *
 573  * Cleanup includes -
 574  *      - All packets in RA lists
 575  *      - All entries in Rx reorder table
 576  *      - All entries in Tx BA stream table
 577  *      - MPA buffer (if required)
 578  *      - All RA lists
 579  */
 580 void
 581 mwifiex_clean_txrx(struct mwifiex_private *priv)
 582 {
 583         unsigned long flags;
 584         struct sk_buff *skb, *tmp;
 585
 586         mwifiex_11n_cleanup_reorder_tbl(priv);
 587         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 588
 589         mwifiex_wmm_cleanup_queues(priv);
 590         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 591
 592         if (priv->adapter->if_ops.cleanup_mpa_buf)
 593                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 594
 595         mwifiex_wmm_delete_all_ralist(priv);
 596         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 597
 598         if (priv->adapter->if_ops.clean_pcie_ring &&
 599             !priv->adapter->surprise_removed)
 600                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 601         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 602
 603         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
 604                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 605
 606         skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
 607                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 608         atomic_set(&priv->adapter->bypass_tx_pending, 0);
 609
 610         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 611         idr_destroy(&priv->ack_status_frames);
 612 }
 613
 614 /*
 615  * This function retrieves a particular RA list node, matching with the
 616  * given TID and RA address.
 617  */
 618 struct mwifiex_ra_list_tbl *
 619 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 620                             const u8 *ra_addr)
 621 {
 622         struct mwifiex_ra_list_tbl *ra_list;
 623
 624         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 625                             list) {
 626                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 627                         return ra_list;
 628         }
 629
 630         return NULL;
 631 }
 632
 633 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
 634                                     u8 tx_pause)
 635 {
 636         struct mwifiex_ra_list_tbl *ra_list;
 637         u32 pkt_cnt = 0, tx_pkts_queued;
 638         unsigned long flags;
 639         int i;
 640
 641         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 642
 643         for (i = 0; i < MAX_NUM_TID; ++i) {
 644                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
 645                 if (ra_list && ra_list->tx_paused != tx_pause) {
 646                         pkt_cnt += ra_list->total_pkt_count;
 647                         ra_list->tx_paused = tx_pause;
 648                         if (tx_pause)
 649                                 priv->wmm.pkts_paused[i] +=
 650                                         ra_list->total_pkt_count;
 651                         else
 652                                 priv->wmm.pkts_paused[i] -=
 653                                         ra_list->total_pkt_count;
 654                 }
 655         }
 656
 657         if (pkt_cnt) {
 658                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 659                 if (tx_pause)
 660                         tx_pkts_queued -= pkt_cnt;
 661                 else
 662                         tx_pkts_queued += pkt_cnt;
 663
 664                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 665                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 666         }
 667         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 668 }
 669
 670 /* This function update non-tdls peer ralist tx_pause while
 671  * tdls channel swithing
 672  */
 673 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
 674                                                u8 *mac, u8 tx_pause)
 675 {
 676         struct mwifiex_ra_list_tbl *ra_list;
 677         u32 pkt_cnt = 0, tx_pkts_queued;
 678         unsigned long flags;
 679         int i;
 680
 681         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 682
 683         for (i = 0; i < MAX_NUM_TID; ++i) {
 684                 list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
 685                                     list) {
 686                         if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 687                                 continue;
 688
 689                         if (ra_list->tx_paused != tx_pause) {
 690                                 pkt_cnt += ra_list->total_pkt_count;
 691                                 ra_list->tx_paused = tx_pause;
 692                                 if (tx_pause)
 693                                         priv->wmm.pkts_paused[i] +=
 694                                                 ra_list->total_pkt_count;
 695                                 else
 696                                         priv->wmm.pkts_paused[i] -=
 697                                                 ra_list->total_pkt_count;
 698                         }
 699                 }
 700         }
 701
 702         if (pkt_cnt) {
 703                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 704                 if (tx_pause)
 705                         tx_pkts_queued -= pkt_cnt;
 706                 else
 707                         tx_pkts_queued += pkt_cnt;
 708
 709                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 710                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 711         }
 712         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 713 }
 714
 715 /*
 716  * This function retrieves an RA list node for a given TID and
 717  * RA address pair.
 718  *
 719  * If no such node is found, a new node is added first and then
 720  * retrieved.
 721  */
 722 struct mwifiex_ra_list_tbl *
 723 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 724                             const u8 *ra_addr)
 725 {
 726         struct mwifiex_ra_list_tbl *ra_list;
 727
 728         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 729         if (ra_list)
 730                 return ra_list;
 731         mwifiex_ralist_add(priv, ra_addr);
 732
 733         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 734 }
 735
 736 /*
 737  * This function deletes RA list nodes for given mac for all TIDs.
 738  * Function also decrements TX pending count accordingly.
 739  */
 740 void
 741 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 742 {
 743         struct mwifiex_ra_list_tbl *ra_list;
 744         unsigned long flags;
 745         int i;
 746
 747         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 748
 749         for (i = 0; i < MAX_NUM_TID; ++i) {
 750                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 751
 752                 if (!ra_list)
 753                         continue;
 754                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 755                 if (ra_list->tx_paused)
 756                         priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
 757                 else
 758                         atomic_sub(ra_list->total_pkt_count,
 759                                    &priv->wmm.tx_pkts_queued);
 760                 list_del(&ra_list->list);
 761                 kfree(ra_list);
 762         }
 763         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 764 }
 765
 766 /*
 767  * This function checks if a particular RA list node exists in a given TID
 768  * table index.
 769  */
 770 int
 771 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 772                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 773 {
 774         struct mwifiex_ra_list_tbl *rlist;
 775
 776         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 777                             list) {
 778                 if (rlist == ra_list)
 779                         return true;
 780         }
 781
 782         return false;
 783 }
 784
 785 /*
 786  * This function adds a packet to bypass TX queue.
 787  * This is special TX queue for packets which can be sent even when port_open
 788  * is false.
 789  */
 790 void
 791 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
 792                                    struct sk_buff *skb)
 793 {
 794         skb_queue_tail(&priv->bypass_txq, skb);
 795 }
 796
 797 /*
 798  * This function adds a packet to WMM queue.
 799  *
 800  * In disconnected state the packet is immediately dropped and the
 801  * packet send completion callback is called with status failure.
 802  *
 803  * Otherwise, the correct RA list node is located and the packet
 804  * is queued at the list tail.
 805  */
 806 void
 807 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 808                             struct sk_buff *skb)
 809 {
 810         struct mwifiex_adapter *adapter = priv->adapter;
 811         u32 tid;
 812         struct mwifiex_ra_list_tbl *ra_list;
 813         u8 ra[ETH_ALEN], tid_down;
 814         unsigned long flags;
 815         struct list_head list_head;
 816         int tdls_status = TDLS_NOT_SETUP;
 817         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 818         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 819
 820         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 821
 822         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 823             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 824                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 825                         mwifiex_dbg(adapter, DATA,
 826                                     "TDLS setup packet for %pM.\t"
 827                                     "Don't block\n", ra);
 828                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 829                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 830         }
 831
 832         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 833                 mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
 834                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 835                 return;
 836         }
 837
 838         tid = skb->priority;
 839
 840         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 841
 842         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 843
 844         /* In case of infra as we have already created the list during
 845            association we just don't have to call get_queue_raptr, we will
 846            have only 1 raptr for a tid in case of infra */
 847         if (!mwifiex_queuing_ra_based(priv) &&
 848             !mwifiex_is_skb_mgmt_frame(skb)) {
 849                 switch (tdls_status) {
 850                 case TDLS_SETUP_COMPLETE:
 851                 case TDLS_CHAN_SWITCHING:
 852                 case TDLS_IN_BASE_CHAN:
 853                 case TDLS_IN_OFF_CHAN:
 854                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 855                                                               ra);
 856                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 857                         break;
 858                 case TDLS_SETUP_INPROGRESS:
 859                         skb_queue_tail(&priv->tdls_txq, skb);
 860                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 861                                                flags);
 862                         return;
 863                 default:
 864                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 865                         if (!list_empty(&list_head))
 866                                 ra_list = list_first_entry(
 867                                         &list_head, struct mwifiex_ra_list_tbl,
 868                                         list);
 869                         else
 870                                 ra_list = NULL;
 871                         break;
 872                 }
 873         } else {
 874                 memcpy(ra, skb->data, ETH_ALEN);
 875                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 876                         eth_broadcast_addr(ra);
 877                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 878         }
 879
 880         if (!ra_list) {
 881                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 882                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 883                 return;
 884         }
 885
 886         skb_queue_tail(&ra_list->skb_head, skb);
 887
 888         ra_list->ba_pkt_count++;
 889         ra_list->total_pkt_count++;
 890
 891         if (atomic_read(&priv->wmm.highest_queued_prio) <
 892                                                 priv->tos_to_tid_inv[tid_down])
 893                 atomic_set(&priv->wmm.highest_queued_prio,
 894                            priv->tos_to_tid_inv[tid_down]);
 895
 896         if (ra_list->tx_paused)
 897                 priv->wmm.pkts_paused[tid_down]++;
 898         else
 899                 atomic_inc(&priv->wmm.tx_pkts_queued);
 900
 901         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 902 }
 903
 904 /*
 905  * This function processes the get WMM status command response from firmware.
 906  *
 907  * The response may contain multiple TLVs -
 908  *      - AC Queue status TLVs
 909  *      - Current WMM Parameter IE TLV
 910  *      - Admission Control action frame TLVs
 911  *
 912  * This function parses the TLVs and then calls further specific functions
 913  * to process any changes in the queue prioritize or state.
 914  */
 915 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 916                                const struct host_cmd_ds_command *resp)
 917 {
 918         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 919         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 920         int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
 921         bool valid = true;
 922
 923         struct mwifiex_ie_types_data *tlv_hdr;
 924         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 925         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 926         struct mwifiex_wmm_ac_status *ac_status;
 927
 928         mwifiex_dbg(priv->adapter, INFO,
 929                     "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 930                     resp_len);
 931
 932         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 933                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 934                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 935
 936                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 937                         break;
 938
 939                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 940                 case TLV_TYPE_WMMQSTATUS:
 941                         tlv_wmm_qstatus =
 942                                 (struct mwifiex_ie_types_wmm_queue_status *)
 943                                 tlv_hdr;
 944                         mwifiex_dbg(priv->adapter, CMD,
 945                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 946                                     "QSTATUS TLV: %d, %d, %d\n",
 947                                     tlv_wmm_qstatus->queue_index,
 948                                     tlv_wmm_qstatus->flow_required,
 949                                     tlv_wmm_qstatus->disabled);
 950
 951                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 952                                                          queue_index];
 953                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 954                         ac_status->flow_required =
 955                                                 tlv_wmm_qstatus->flow_required;
 956                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 957                         break;
 958
 959                 case WLAN_EID_VENDOR_SPECIFIC:
 960                         /*
 961                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 962                          *   and setup the IEEE IE type and length byte fields
 963                          */
 964
 965                         wmm_param_ie =
 966                                 (struct ieee_types_wmm_parameter *) (curr +
 967                                                                     2);
 968                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 969                         wmm_param_ie->vend_hdr.element_id =
 970                                                 WLAN_EID_VENDOR_SPECIFIC;
 971
 972                         mwifiex_dbg(priv->adapter, CMD,
 973                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 974                                     "WMM Parameter Set Count: %d\n",
 975                                     wmm_param_ie->qos_info_bitmap & mask);
 976
 977                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 978                                wmm_ie, wmm_param_ie,
 979                                wmm_param_ie->vend_hdr.len + 2);
 980
 981                         break;
 982
 983                 default:
 984                         valid = false;
 985                         break;
 986                 }
 987
 988                 curr += (tlv_len + sizeof(tlv_hdr->header));
 989                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 990         }
 991
 992         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 993         mwifiex_wmm_setup_ac_downgrade(priv);
 994
 995         return 0;
 996 }
 997
 998 /*
 999  * Callback handler from the command module to allow insertion of a WMM TLV.
1000  *
1001  * If the BSS we are associating to supports WMM, this function adds the
1002  * required WMM Information IE to the association request command buffer in
1003  * the form of a Marvell extended IEEE IE.
1004  */
1005 u32
1006 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
1007                                     u8 **assoc_buf,
1008                                     struct ieee_types_wmm_parameter *wmm_ie,
1009                                     struct ieee80211_ht_cap *ht_cap)
1010 {
1011         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
1012         u32 ret_len = 0;
1013
1014         /* Null checks */
1015         if (!assoc_buf)
1016                 return 0;
1017         if (!(*assoc_buf))
1018                 return 0;
1019
1020         if (!wmm_ie)
1021                 return 0;
1022
1023         mwifiex_dbg(priv->adapter, INFO,
1024                     "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1025                     wmm_ie->vend_hdr.element_id);
1026
1027         if ((priv->wmm_required ||
1028              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1029              priv->adapter->config_bands & BAND_AN))) &&
1030             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1031                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1032                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1033                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1034                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1035                        le16_to_cpu(wmm_tlv->header.len));
1036                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1037                         memcpy((u8 *) (wmm_tlv->wmm_ie
1038                                        + le16_to_cpu(wmm_tlv->header.len)
1039                                        - sizeof(priv->wmm_qosinfo)),
1040                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1041
1042                 ret_len = sizeof(wmm_tlv->header)
1043                           + le16_to_cpu(wmm_tlv->header.len);
1044
1045                 *assoc_buf += ret_len;
1046         }
1047
1048         return ret_len;
1049 }
1050
1051 /*
1052  * This function computes the time delay in the driver queues for a
1053  * given packet.
1054  *
1055  * When the packet is received at the OS/Driver interface, the current
1056  * time is set in the packet structure. The difference between the present
1057  * time and that received time is computed in this function and limited
1058  * based on pre-compiled limits in the driver.
1059  */
1060 u8
1061 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1062                                   const struct sk_buff *skb)
1063 {
1064         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1065         u8 ret_val;
1066
1067         /*
1068          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1069          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1070          *
1071          * Pass max value if queue_delay is beyond the uint8 range
1072          */
1073         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1074
1075         mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1076                     "%d ms sent to FW\n", queue_delay, ret_val);
1077
1078         return ret_val;
1079 }
1080
1081 /*
1082  * This function retrieves the highest priority RA list table pointer.
1083  */
1084 static struct mwifiex_ra_list_tbl *
1085 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1086                                      struct mwifiex_private **priv, int *tid)
1087 {
1088         struct mwifiex_private *priv_tmp;
1089         struct mwifiex_ra_list_tbl *ptr;
1090         struct mwifiex_tid_tbl *tid_ptr;
1091         atomic_t *hqp;
1092         unsigned long flags_ra;
1093         int i, j;
1094
1095         /* check the BSS with highest priority first */
1096         for (j = adapter->priv_num - 1; j >= 0; --j) {
1097                 /* iterate over BSS with the equal priority */
1098                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1099                                     &adapter->bss_prio_tbl[j].bss_prio_head,
1100                                     list) {
1101
1102                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1103
1104                         if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
1105                              !priv_tmp->port_open) ||
1106                             (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1107                                 continue;
1108
1109                         if (adapter->if_ops.is_port_ready &&
1110                             !adapter->if_ops.is_port_ready(priv_tmp))
1111                                 continue;
1112
1113                         /* iterate over the WMM queues of the BSS */
1114                         hqp = &priv_tmp->wmm.highest_queued_prio;
1115                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1116
1117                                 spin_lock_irqsave(&priv_tmp->wmm.
1118                                                   ra_list_spinlock, flags_ra);
1119
1120                                 tid_ptr = &(priv_tmp)->wmm.
1121                                         tid_tbl_ptr[tos_to_tid[i]];
1122
1123                                 /* iterate over receiver addresses */
1124                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1125                                                     list) {
1126
1127                                         if (!ptr->tx_paused &&
1128                                             !skb_queue_empty(&ptr->skb_head))
1129                                                 /* holds both locks */
1130                                                 goto found;
1131                                 }
1132
1133                                 spin_unlock_irqrestore(&priv_tmp->wmm.
1134                                                        ra_list_spinlock,
1135                                                        flags_ra);
1136                         }
1137                 }
1138
1139         }
1140
1141         return NULL;
1142
1143 found:
1144         /* holds ra_list_spinlock */
1145         if (atomic_read(hqp) > i)
1146                 atomic_set(hqp, i);
1147         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1148
1149         *priv = priv_tmp;
1150         *tid = tos_to_tid[i];
1151
1152         return ptr;
1153 }
1154
1155 /* This functions rotates ra and bss lists so packets are picked round robin.
1156  *
1157  * After a packet is successfully transmitted, rotate the ra list, so the ra
1158  * next to the one transmitted, will come first in the list. This way we pick
1159  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1160  * priority.
1161  *
1162  * Function also increments wmm.packets_out counter.
1163  */
1164 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1165                                  struct mwifiex_ra_list_tbl *ra,
1166                                  int tid)
1167 {
1168         struct mwifiex_adapter *adapter = priv->adapter;
1169         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1170         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1171         unsigned long flags;
1172
1173         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1174         /*
1175          * dirty trick: we remove 'head' temporarily and reinsert it after
1176          * curr bss node. imagine list to stay fixed while head is moved
1177          */
1178         list_move(&tbl[priv->bss_priority].bss_prio_head,
1179                   &tbl[priv->bss_priority].bss_prio_cur->list);
1180         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1181
1182         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1183         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1184                 priv->wmm.packets_out[tid]++;
1185                 /* same as above */
1186                 list_move(&tid_ptr->ra_list, &ra->list);
1187         }
1188         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1189 }
1190
1191 /*
1192  * This function checks if 11n aggregation is possible.
1193  */
1194 static int
1195 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1196                                     struct mwifiex_ra_list_tbl *ptr,
1197                                     int max_buf_size)
1198 {
1199         int count = 0, total_size = 0;
1200         struct sk_buff *skb, *tmp;
1201         int max_amsdu_size;
1202
1203         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1204             ptr->is_11n_enabled)
1205                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1206         else
1207                 max_amsdu_size = max_buf_size;
1208
1209         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1210                 total_size += skb->len;
1211                 if (total_size >= max_amsdu_size)
1212                         break;
1213                 if (++count >= MIN_NUM_AMSDU)
1214                         return true;
1215         }
1216
1217         return false;
1218 }
1219
1220 /*
1221  * This function sends a single packet to firmware for transmission.
1222  */
1223 static void
1224 mwifiex_send_single_packet(struct mwifiex_private *priv,
1225                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1226                            unsigned long ra_list_flags)
1227                            __releases(&priv->wmm.ra_list_spinlock)
1228 {
1229         struct sk_buff *skb, *skb_next;
1230         struct mwifiex_tx_param tx_param;
1231         struct mwifiex_adapter *adapter = priv->adapter;
1232         struct mwifiex_txinfo *tx_info;
1233
1234         if (skb_queue_empty(&ptr->skb_head)) {
1235                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1236                                        ra_list_flags);
1237                 mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1238                 return;
1239         }
1240
1241         skb = skb_dequeue(&ptr->skb_head);
1242
1243         tx_info = MWIFIEX_SKB_TXCB(skb);
1244         mwifiex_dbg(adapter, DATA,
1245                     "data: dequeuing the packet %p %p\n", ptr, skb);
1246
1247         ptr->total_pkt_count--;
1248
1249         if (!skb_queue_empty(&ptr->skb_head))
1250                 skb_next = skb_peek(&ptr->skb_head);
1251         else
1252                 skb_next = NULL;
1253
1254         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1255
1256         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1257                                 sizeof(struct txpd) : 0);
1258
1259         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1260                 /* Queue the packet back at the head */
1261                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1262
1263                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1264                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1265                                                ra_list_flags);
1266                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1267                         return;
1268                 }
1269
1270                 skb_queue_tail(&ptr->skb_head, skb);
1271
1272                 ptr->total_pkt_count++;
1273                 ptr->ba_pkt_count++;
1274                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1275                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1276                                        ra_list_flags);
1277         } else {
1278                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1279                 atomic_dec(&priv->wmm.tx_pkts_queued);
1280         }
1281 }
1282
1283 /*
1284  * This function checks if the first packet in the given RA list
1285  * is already processed or not.
1286  */
1287 static int
1288 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1289                          struct mwifiex_ra_list_tbl *ptr)
1290 {
1291         struct sk_buff *skb;
1292         struct mwifiex_txinfo *tx_info;
1293
1294         if (skb_queue_empty(&ptr->skb_head))
1295                 return false;
1296
1297         skb = skb_peek(&ptr->skb_head);
1298
1299         tx_info = MWIFIEX_SKB_TXCB(skb);
1300         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1301                 return true;
1302
1303         return false;
1304 }
1305
1306 /*
1307  * This function sends a single processed packet to firmware for
1308  * transmission.
1309  */
1310 static void
1311 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1312                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1313                               unsigned long ra_list_flags)
1314                                 __releases(&priv->wmm.ra_list_spinlock)
1315 {
1316         struct mwifiex_tx_param tx_param;
1317         struct mwifiex_adapter *adapter = priv->adapter;
1318         int ret = -1;
1319         struct sk_buff *skb, *skb_next;
1320         struct mwifiex_txinfo *tx_info;
1321
1322         if (skb_queue_empty(&ptr->skb_head)) {
1323                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1324                                        ra_list_flags);
1325                 return;
1326         }
1327
1328         skb = skb_dequeue(&ptr->skb_head);
1329
1330         if (adapter->data_sent || adapter->tx_lock_flag) {
1331                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1332                                        ra_list_flags);
1333                 skb_queue_tail(&adapter->tx_data_q, skb);
1334                 atomic_inc(&adapter->tx_queued);
1335                 return;
1336         }
1337
1338         if (!skb_queue_empty(&ptr->skb_head))
1339                 skb_next = skb_peek(&ptr->skb_head);
1340         else
1341                 skb_next = NULL;
1342
1343         tx_info = MWIFIEX_SKB_TXCB(skb);
1344
1345         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1346
1347         if (adapter->iface_type == MWIFIEX_USB) {
1348                 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
1349                                                    skb, NULL);
1350         } else {
1351                 tx_param.next_pkt_len =
1352                         ((skb_next) ? skb_next->len +
1353                          sizeof(struct txpd) : 0);
1354                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1355                                                    skb, &tx_param);
1356         }
1357
1358         switch (ret) {
1359         case -EBUSY:
1360                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1361                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1362
1363                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1364                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1365                                                ra_list_flags);
1366                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1367                         return;
1368                 }
1369
1370                 skb_queue_tail(&ptr->skb_head, skb);
1371
1372                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1373                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1374                                        ra_list_flags);
1375                 break;
1376         case -1:
1377                 mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1378                 adapter->dbg.num_tx_host_to_card_failure++;
1379                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1380                 break;
1381         case -EINPROGRESS:
1382                 break;
1383         case 0:
1384                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1385         default:
1386                 break;
1387         }
1388         if (ret != -EBUSY) {
1389                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1390                 atomic_dec(&priv->wmm.tx_pkts_queued);
1391         }
1392 }
1393
1394 /*
1395  * This function dequeues a packet from the highest priority list
1396  * and transmits it.
1397  */
1398 static int
1399 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1400 {
1401         struct mwifiex_ra_list_tbl *ptr;
1402         struct mwifiex_private *priv = NULL;
1403         int ptr_index = 0;
1404         u8 ra[ETH_ALEN];
1405         int tid_del = 0, tid = 0;
1406         unsigned long flags;
1407
1408         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1409         if (!ptr)
1410                 return -1;
1411
1412         tid = mwifiex_get_tid(ptr);
1413
1414         mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1415
1416         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1417         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1418                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1419                 return -1;
1420         }
1421
1422         if (mwifiex_is_ptr_processed(priv, ptr)) {
1423                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1424                 /* ra_list_spinlock has been freed in
1425                    mwifiex_send_processed_packet() */
1426                 return 0;
1427         }
1428
1429         if (!ptr->is_11n_enabled ||
1430                 ptr->ba_status ||
1431                 priv->wps.session_enable) {
1432                 if (ptr->is_11n_enabled &&
1433                         ptr->ba_status &&
1434                         ptr->amsdu_in_ampdu &&
1435                         mwifiex_is_amsdu_allowed(priv, tid) &&
1436                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1437                                                         adapter->tx_buf_size))
1438                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1439                         /* ra_list_spinlock has been freed in
1440                          * mwifiex_11n_aggregate_pkt()
1441                          */
1442                 else
1443                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1444                         /* ra_list_spinlock has been freed in
1445                          * mwifiex_send_single_packet()
1446                          */
1447         } else {
1448                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1449                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1450                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1451                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1452                                                       BA_SETUP_INPROGRESS);
1453                                 mwifiex_send_addba(priv, tid, ptr->ra);
1454                         } else if (mwifiex_find_stream_to_delete
1455                                    (priv, tid, &tid_del, ra)) {
1456                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1457                                                       BA_SETUP_INPROGRESS);
1458                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1459                         }
1460                 }
1461                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1462                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1463                                                         adapter->tx_buf_size))
1464                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1465                         /* ra_list_spinlock has been freed in
1466                            mwifiex_11n_aggregate_pkt() */
1467                 else
1468                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1469                         /* ra_list_spinlock has been freed in
1470                            mwifiex_send_single_packet() */
1471         }
1472         return 0;
1473 }
1474
1475 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1476 {
1477         struct mwifiex_tx_param tx_param;
1478         struct sk_buff *skb;
1479         struct mwifiex_txinfo *tx_info;
1480         struct mwifiex_private *priv;
1481         int i;
1482
1483         if (adapter->data_sent || adapter->tx_lock_flag)
1484                 return;
1485
1486         for (i = 0; i < adapter->priv_num; ++i) {
1487                 priv = adapter->priv[i];
1488
1489                 if (!priv)
1490                         continue;
1491
1492                 if (adapter->if_ops.is_port_ready &&
1493                     !adapter->if_ops.is_port_ready(priv))
1494                         continue;
1495
1496                 if (skb_queue_empty(&priv->bypass_txq))
1497                         continue;
1498
1499                 skb = skb_dequeue(&priv->bypass_txq);
1500                 tx_info = MWIFIEX_SKB_TXCB(skb);
1501
1502                 /* no aggregation for bypass packets */
1503                 tx_param.next_pkt_len = 0;
1504
1505                 if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1506                         skb_queue_head(&priv->bypass_txq, skb);
1507                         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1508                 } else {
1509                         atomic_dec(&adapter->bypass_tx_pending);
1510                 }
1511         }
1512 }
1513
1514 /*
1515  * This function transmits the highest priority packet awaiting in the
1516  * WMM Queues.
1517  */
1518 void
1519 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1520 {
1521         do {
1522                 if (mwifiex_dequeue_tx_packet(adapter))
1523                         break;
1524                 if (adapter->iface_type != MWIFIEX_SDIO) {
1525                         if (adapter->data_sent ||
1526                             adapter->tx_lock_flag)
1527                                 break;
1528                 } else {
1529                         if (atomic_read(&adapter->tx_queued) >=
1530                             MWIFIEX_MAX_PKTS_TXQ)
1531                                 break;
1532                 }
1533         } while (!mwifiex_wmm_lists_empty(adapter));
1534 }