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->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                 skb_unlink(skb, &ra_list->skb_head);
 508                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 509         }
 510 }
 511
 512 /*
 513  * This function deletes all packets in an RA list.
 514  *
 515  * Each nodes in the RA list are freed individually first, and then
 516  * the RA list itself is freed.
 517  */
 518 static void
 519 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 520                                struct list_head *ra_list_head)
 521 {
 522         struct mwifiex_ra_list_tbl *ra_list;
 523
 524         list_for_each_entry(ra_list, ra_list_head, list)
 525                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 526 }
 527
 528 /*
 529  * This function deletes all packets in all RA lists.
 530  */
 531 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 532 {
 533         int i;
 534
 535         for (i = 0; i < MAX_NUM_TID; i++)
 536                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 537                                                                        ra_list);
 538
 539         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 540         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 541 }
 542
 543 /*
 544  * This function deletes all route addresses from all RA lists.
 545  */
 546 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 547 {
 548         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 549         int i;
 550
 551         for (i = 0; i < MAX_NUM_TID; ++i) {
 552                 mwifiex_dbg(priv->adapter, INFO,
 553                             "info: ra_list: freeing buf for tid %d\n", i);
 554                 list_for_each_entry_safe(ra_list, tmp_node,
 555                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 556                                          list) {
 557                         list_del(&ra_list->list);
 558                         kfree(ra_list);
 559                 }
 560
 561                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 562         }
 563 }
 564
 565 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 566 {
 567         pr_warn("Have pending ack frames!\n");
 568         kfree_skb(p);
 569         return 0;
 570 }
 571
 572 /*
 573  * This function cleans up the Tx and Rx queues.
 574  *
 575  * Cleanup includes -
 576  *      - All packets in RA lists
 577  *      - All entries in Rx reorder table
 578  *      - All entries in Tx BA stream table
 579  *      - MPA buffer (if required)
 580  *      - All RA lists
 581  */
 582 void
 583 mwifiex_clean_txrx(struct mwifiex_private *priv)
 584 {
 585         unsigned long flags;
 586         struct sk_buff *skb, *tmp;
 587
 588         mwifiex_11n_cleanup_reorder_tbl(priv);
 589         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 590
 591         mwifiex_wmm_cleanup_queues(priv);
 592         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 593
 594         if (priv->adapter->if_ops.cleanup_mpa_buf)
 595                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 596
 597         mwifiex_wmm_delete_all_ralist(priv);
 598         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 599
 600         if (priv->adapter->if_ops.clean_pcie_ring &&
 601             !priv->adapter->surprise_removed)
 602                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 603         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 604
 605         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
 606                 skb_unlink(skb, &priv->tdls_txq);
 607                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 608         }
 609
 610         skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
 611                 skb_unlink(skb, &priv->bypass_txq);
 612                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 613         }
 614         atomic_set(&priv->adapter->bypass_tx_pending, 0);
 615
 616         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 617         idr_destroy(&priv->ack_status_frames);
 618 }
 619
 620 /*
 621  * This function retrieves a particular RA list node, matching with the
 622  * given TID and RA address.
 623  */
 624 struct mwifiex_ra_list_tbl *
 625 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 626                             const u8 *ra_addr)
 627 {
 628         struct mwifiex_ra_list_tbl *ra_list;
 629
 630         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 631                             list) {
 632                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 633                         return ra_list;
 634         }
 635
 636         return NULL;
 637 }
 638
 639 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
 640                                     u8 tx_pause)
 641 {
 642         struct mwifiex_ra_list_tbl *ra_list;
 643         u32 pkt_cnt = 0, tx_pkts_queued;
 644         unsigned long flags;
 645         int i;
 646
 647         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 648
 649         for (i = 0; i < MAX_NUM_TID; ++i) {
 650                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
 651                 if (ra_list && ra_list->tx_paused != tx_pause) {
 652                         pkt_cnt += ra_list->total_pkt_count;
 653                         ra_list->tx_paused = tx_pause;
 654                         if (tx_pause)
 655                                 priv->wmm.pkts_paused[i] +=
 656                                         ra_list->total_pkt_count;
 657                         else
 658                                 priv->wmm.pkts_paused[i] -=
 659                                         ra_list->total_pkt_count;
 660                 }
 661         }
 662
 663         if (pkt_cnt) {
 664                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 665                 if (tx_pause)
 666                         tx_pkts_queued -= pkt_cnt;
 667                 else
 668                         tx_pkts_queued += pkt_cnt;
 669
 670                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 671                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 672         }
 673         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 674 }
 675
 676 /* This function updates non-tdls peer ralist tx_pause while
 677  * tdls channel switching
 678  */
 679 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
 680                                                u8 *mac, u8 tx_pause)
 681 {
 682         struct mwifiex_ra_list_tbl *ra_list;
 683         u32 pkt_cnt = 0, tx_pkts_queued;
 684         unsigned long flags;
 685         int i;
 686
 687         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 688
 689         for (i = 0; i < MAX_NUM_TID; ++i) {
 690                 list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
 691                                     list) {
 692                         if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 693                                 continue;
 694
 695                         if (ra_list->tx_paused != tx_pause) {
 696                                 pkt_cnt += ra_list->total_pkt_count;
 697                                 ra_list->tx_paused = tx_pause;
 698                                 if (tx_pause)
 699                                         priv->wmm.pkts_paused[i] +=
 700                                                 ra_list->total_pkt_count;
 701                                 else
 702                                         priv->wmm.pkts_paused[i] -=
 703                                                 ra_list->total_pkt_count;
 704                         }
 705                 }
 706         }
 707
 708         if (pkt_cnt) {
 709                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 710                 if (tx_pause)
 711                         tx_pkts_queued -= pkt_cnt;
 712                 else
 713                         tx_pkts_queued += pkt_cnt;
 714
 715                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 716                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 717         }
 718         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 719 }
 720
 721 /*
 722  * This function retrieves an RA list node for a given TID and
 723  * RA address pair.
 724  *
 725  * If no such node is found, a new node is added first and then
 726  * retrieved.
 727  */
 728 struct mwifiex_ra_list_tbl *
 729 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 730                             const u8 *ra_addr)
 731 {
 732         struct mwifiex_ra_list_tbl *ra_list;
 733
 734         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 735         if (ra_list)
 736                 return ra_list;
 737         mwifiex_ralist_add(priv, ra_addr);
 738
 739         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 740 }
 741
 742 /*
 743  * This function deletes RA list nodes for given mac for all TIDs.
 744  * Function also decrements TX pending count accordingly.
 745  */
 746 void
 747 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 748 {
 749         struct mwifiex_ra_list_tbl *ra_list;
 750         unsigned long flags;
 751         int i;
 752
 753         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 754
 755         for (i = 0; i < MAX_NUM_TID; ++i) {
 756                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 757
 758                 if (!ra_list)
 759                         continue;
 760                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 761                 if (ra_list->tx_paused)
 762                         priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
 763                 else
 764                         atomic_sub(ra_list->total_pkt_count,
 765                                    &priv->wmm.tx_pkts_queued);
 766                 list_del(&ra_list->list);
 767                 kfree(ra_list);
 768         }
 769         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 770 }
 771
 772 /*
 773  * This function checks if a particular RA list node exists in a given TID
 774  * table index.
 775  */
 776 int
 777 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 778                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 779 {
 780         struct mwifiex_ra_list_tbl *rlist;
 781
 782         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 783                             list) {
 784                 if (rlist == ra_list)
 785                         return true;
 786         }
 787
 788         return false;
 789 }
 790
 791 /*
 792  * This function adds a packet to bypass TX queue.
 793  * This is special TX queue for packets which can be sent even when port_open
 794  * is false.
 795  */
 796 void
 797 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
 798                                    struct sk_buff *skb)
 799 {
 800         skb_queue_tail(&priv->bypass_txq, skb);
 801 }
 802
 803 /*
 804  * This function adds a packet to WMM queue.
 805  *
 806  * In disconnected state the packet is immediately dropped and the
 807  * packet send completion callback is called with status failure.
 808  *
 809  * Otherwise, the correct RA list node is located and the packet
 810  * is queued at the list tail.
 811  */
 812 void
 813 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 814                             struct sk_buff *skb)
 815 {
 816         struct mwifiex_adapter *adapter = priv->adapter;
 817         u32 tid;
 818         struct mwifiex_ra_list_tbl *ra_list;
 819         u8 ra[ETH_ALEN], tid_down;
 820         unsigned long flags;
 821         struct list_head list_head;
 822         int tdls_status = TDLS_NOT_SETUP;
 823         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 824         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 825
 826         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 827
 828         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 829             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 830                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 831                         mwifiex_dbg(adapter, DATA,
 832                                     "TDLS setup packet for %pM.\t"
 833                                     "Don't block\n", ra);
 834                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 835                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 836         }
 837
 838         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 839                 mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
 840                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 841                 return;
 842         }
 843
 844         tid = skb->priority;
 845
 846         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 847
 848         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 849
 850         /* In case of infra as we have already created the list during
 851            association we just don't have to call get_queue_raptr, we will
 852            have only 1 raptr for a tid in case of infra */
 853         if (!mwifiex_queuing_ra_based(priv) &&
 854             !mwifiex_is_skb_mgmt_frame(skb)) {
 855                 switch (tdls_status) {
 856                 case TDLS_SETUP_COMPLETE:
 857                 case TDLS_CHAN_SWITCHING:
 858                 case TDLS_IN_BASE_CHAN:
 859                 case TDLS_IN_OFF_CHAN:
 860                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 861                                                               ra);
 862                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 863                         break;
 864                 case TDLS_SETUP_INPROGRESS:
 865                         skb_queue_tail(&priv->tdls_txq, skb);
 866                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 867                                                flags);
 868                         return;
 869                 default:
 870                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 871                         ra_list = list_first_entry_or_null(&list_head,
 872                                         struct mwifiex_ra_list_tbl, list);
 873                         break;
 874                 }
 875         } else {
 876                 memcpy(ra, skb->data, ETH_ALEN);
 877                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 878                         eth_broadcast_addr(ra);
 879                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 880         }
 881
 882         if (!ra_list) {
 883                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 884                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 885                 return;
 886         }
 887
 888         skb_queue_tail(&ra_list->skb_head, skb);
 889
 890         ra_list->ba_pkt_count++;
 891         ra_list->total_pkt_count++;
 892
 893         if (atomic_read(&priv->wmm.highest_queued_prio) <
 894                                                 priv->tos_to_tid_inv[tid_down])
 895                 atomic_set(&priv->wmm.highest_queued_prio,
 896                            priv->tos_to_tid_inv[tid_down]);
 897
 898         if (ra_list->tx_paused)
 899                 priv->wmm.pkts_paused[tid_down]++;
 900         else
 901                 atomic_inc(&priv->wmm.tx_pkts_queued);
 902
 903         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 904 }
 905
 906 /*
 907  * This function processes the get WMM status command response from firmware.
 908  *
 909  * The response may contain multiple TLVs -
 910  *      - AC Queue status TLVs
 911  *      - Current WMM Parameter IE TLV
 912  *      - Admission Control action frame TLVs
 913  *
 914  * This function parses the TLVs and then calls further specific functions
 915  * to process any changes in the queue prioritize or state.
 916  */
 917 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 918                                const struct host_cmd_ds_command *resp)
 919 {
 920         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 921         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 922         int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
 923         bool valid = true;
 924
 925         struct mwifiex_ie_types_data *tlv_hdr;
 926         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 927         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 928         struct mwifiex_wmm_ac_status *ac_status;
 929
 930         mwifiex_dbg(priv->adapter, INFO,
 931                     "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 932                     resp_len);
 933
 934         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 935                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 936                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 937
 938                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 939                         break;
 940
 941                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 942                 case TLV_TYPE_WMMQSTATUS:
 943                         tlv_wmm_qstatus =
 944                                 (struct mwifiex_ie_types_wmm_queue_status *)
 945                                 tlv_hdr;
 946                         mwifiex_dbg(priv->adapter, CMD,
 947                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 948                                     "QSTATUS TLV: %d, %d, %d\n",
 949                                     tlv_wmm_qstatus->queue_index,
 950                                     tlv_wmm_qstatus->flow_required,
 951                                     tlv_wmm_qstatus->disabled);
 952
 953                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 954                                                          queue_index];
 955                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 956                         ac_status->flow_required =
 957                                                 tlv_wmm_qstatus->flow_required;
 958                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 959                         break;
 960
 961                 case WLAN_EID_VENDOR_SPECIFIC:
 962                         /*
 963                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 964                          *   and setup the IEEE IE type and length byte fields
 965                          */
 966
 967                         wmm_param_ie =
 968                                 (struct ieee_types_wmm_parameter *) (curr +
 969                                                                     2);
 970                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 971                         wmm_param_ie->vend_hdr.element_id =
 972                                                 WLAN_EID_VENDOR_SPECIFIC;
 973
 974                         mwifiex_dbg(priv->adapter, CMD,
 975                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 976                                     "WMM Parameter Set Count: %d\n",
 977                                     wmm_param_ie->qos_info_bitmap & mask);
 978
 979                         if (wmm_param_ie->vend_hdr.len + 2 >
 980                                 sizeof(struct ieee_types_wmm_parameter))
 981                                 break;
 982
 983                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 984                                wmm_ie, wmm_param_ie,
 985                                wmm_param_ie->vend_hdr.len + 2);
 986
 987                         break;
 988
 989                 default:
 990                         valid = false;
 991                         break;
 992                 }
 993
 994                 curr += (tlv_len + sizeof(tlv_hdr->header));
 995                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 996         }
 997
 998         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 999         mwifiex_wmm_setup_ac_downgrade(priv);
1000
1001         return 0;
1002 }
1003
1004 /*
1005  * Callback handler from the command module to allow insertion of a WMM TLV.
1006  *
1007  * If the BSS we are associating to supports WMM, this function adds the
1008  * required WMM Information IE to the association request command buffer in
1009  * the form of a Marvell extended IEEE IE.
1010  */
1011 u32
1012 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
1013                                     u8 **assoc_buf,
1014                                     struct ieee_types_wmm_parameter *wmm_ie,
1015                                     struct ieee80211_ht_cap *ht_cap)
1016 {
1017         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
1018         u32 ret_len = 0;
1019
1020         /* Null checks */
1021         if (!assoc_buf)
1022                 return 0;
1023         if (!(*assoc_buf))
1024                 return 0;
1025
1026         if (!wmm_ie)
1027                 return 0;
1028
1029         mwifiex_dbg(priv->adapter, INFO,
1030                     "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1031                     wmm_ie->vend_hdr.element_id);
1032
1033         if ((priv->wmm_required ||
1034              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1035              priv->adapter->config_bands & BAND_AN))) &&
1036             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1037                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1038                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1039                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1040                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1041                        le16_to_cpu(wmm_tlv->header.len));
1042                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1043                         memcpy((u8 *) (wmm_tlv->wmm_ie
1044                                        + le16_to_cpu(wmm_tlv->header.len)
1045                                        - sizeof(priv->wmm_qosinfo)),
1046                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1047
1048                 ret_len = sizeof(wmm_tlv->header)
1049                           + le16_to_cpu(wmm_tlv->header.len);
1050
1051                 *assoc_buf += ret_len;
1052         }
1053
1054         return ret_len;
1055 }
1056
1057 /*
1058  * This function computes the time delay in the driver queues for a
1059  * given packet.
1060  *
1061  * When the packet is received at the OS/Driver interface, the current
1062  * time is set in the packet structure. The difference between the present
1063  * time and that received time is computed in this function and limited
1064  * based on pre-compiled limits in the driver.
1065  */
1066 u8
1067 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1068                                   const struct sk_buff *skb)
1069 {
1070         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1071         u8 ret_val;
1072
1073         /*
1074          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1075          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1076          *
1077          * Pass max value if queue_delay is beyond the uint8 range
1078          */
1079         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1080
1081         mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1082                     "%d ms sent to FW\n", queue_delay, ret_val);
1083
1084         return ret_val;
1085 }
1086
1087 /*
1088  * This function retrieves the highest priority RA list table pointer.
1089  */
1090 static struct mwifiex_ra_list_tbl *
1091 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1092                                      struct mwifiex_private **priv, int *tid)
1093 {
1094         struct mwifiex_private *priv_tmp;
1095         struct mwifiex_ra_list_tbl *ptr;
1096         struct mwifiex_tid_tbl *tid_ptr;
1097         atomic_t *hqp;
1098         unsigned long flags_ra;
1099         int i, j;
1100
1101         /* check the BSS with highest priority first */
1102         for (j = adapter->priv_num - 1; j >= 0; --j) {
1103                 /* iterate over BSS with the equal priority */
1104                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1105                                     &adapter->bss_prio_tbl[j].bss_prio_head,
1106                                     list) {
1107
1108 try_again:
1109                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1110
1111                         if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
1112                              !priv_tmp->port_open) ||
1113                             (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1114                                 continue;
1115
1116                         if (adapter->if_ops.is_port_ready &&
1117                             !adapter->if_ops.is_port_ready(priv_tmp))
1118                                 continue;
1119
1120                         /* iterate over the WMM queues of the BSS */
1121                         hqp = &priv_tmp->wmm.highest_queued_prio;
1122                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1123
1124                                 spin_lock_irqsave(&priv_tmp->wmm.
1125                                                   ra_list_spinlock, flags_ra);
1126
1127                                 tid_ptr = &(priv_tmp)->wmm.
1128                                         tid_tbl_ptr[tos_to_tid[i]];
1129
1130                                 /* iterate over receiver addresses */
1131                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1132                                                     list) {
1133
1134                                         if (!ptr->tx_paused &&
1135                                             !skb_queue_empty(&ptr->skb_head))
1136                                                 /* holds both locks */
1137                                                 goto found;
1138                                 }
1139
1140                                 spin_unlock_irqrestore(&priv_tmp->wmm.
1141                                                        ra_list_spinlock,
1142                                                        flags_ra);
1143                         }
1144
1145                         if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) != 0) {
1146                                 atomic_set(&priv_tmp->wmm.highest_queued_prio,
1147                                            HIGH_PRIO_TID);
1148                                 /* Iterate current private once more, since
1149                                  * there still exist packets in data queue
1150                                  */
1151                                 goto try_again;
1152                         } else
1153                                 atomic_set(&priv_tmp->wmm.highest_queued_prio,
1154                                            NO_PKT_PRIO_TID);
1155                 }
1156         }
1157
1158         return NULL;
1159
1160 found:
1161         /* holds ra_list_spinlock */
1162         if (atomic_read(hqp) > i)
1163                 atomic_set(hqp, i);
1164         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1165
1166         *priv = priv_tmp;
1167         *tid = tos_to_tid[i];
1168
1169         return ptr;
1170 }
1171
1172 /* This functions rotates ra and bss lists so packets are picked round robin.
1173  *
1174  * After a packet is successfully transmitted, rotate the ra list, so the ra
1175  * next to the one transmitted, will come first in the list. This way we pick
1176  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1177  * priority.
1178  *
1179  * Function also increments wmm.packets_out counter.
1180  */
1181 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1182                                  struct mwifiex_ra_list_tbl *ra,
1183                                  int tid)
1184 {
1185         struct mwifiex_adapter *adapter = priv->adapter;
1186         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1187         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1188         unsigned long flags;
1189
1190         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1191         /*
1192          * dirty trick: we remove 'head' temporarily and reinsert it after
1193          * curr bss node. imagine list to stay fixed while head is moved
1194          */
1195         list_move(&tbl[priv->bss_priority].bss_prio_head,
1196                   &tbl[priv->bss_priority].bss_prio_cur->list);
1197         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1198
1199         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1200         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1201                 priv->wmm.packets_out[tid]++;
1202                 /* same as above */
1203                 list_move(&tid_ptr->ra_list, &ra->list);
1204         }
1205         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1206 }
1207
1208 /*
1209  * This function checks if 11n aggregation is possible.
1210  */
1211 static int
1212 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1213                                     struct mwifiex_ra_list_tbl *ptr,
1214                                     int max_buf_size)
1215 {
1216         int count = 0, total_size = 0;
1217         struct sk_buff *skb, *tmp;
1218         int max_amsdu_size;
1219
1220         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1221             ptr->is_11n_enabled)
1222                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1223         else
1224                 max_amsdu_size = max_buf_size;
1225
1226         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1227                 total_size += skb->len;
1228                 if (total_size >= max_amsdu_size)
1229                         break;
1230                 if (++count >= MIN_NUM_AMSDU)
1231                         return true;
1232         }
1233
1234         return false;
1235 }
1236
1237 /*
1238  * This function sends a single packet to firmware for transmission.
1239  */
1240 static void
1241 mwifiex_send_single_packet(struct mwifiex_private *priv,
1242                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1243                            unsigned long ra_list_flags)
1244                            __releases(&priv->wmm.ra_list_spinlock)
1245 {
1246         struct sk_buff *skb, *skb_next;
1247         struct mwifiex_tx_param tx_param;
1248         struct mwifiex_adapter *adapter = priv->adapter;
1249         struct mwifiex_txinfo *tx_info;
1250
1251         if (skb_queue_empty(&ptr->skb_head)) {
1252                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1253                                        ra_list_flags);
1254                 mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1255                 return;
1256         }
1257
1258         skb = skb_dequeue(&ptr->skb_head);
1259
1260         tx_info = MWIFIEX_SKB_TXCB(skb);
1261         mwifiex_dbg(adapter, DATA,
1262                     "data: dequeuing the packet %p %p\n", ptr, skb);
1263
1264         ptr->total_pkt_count--;
1265
1266         if (!skb_queue_empty(&ptr->skb_head))
1267                 skb_next = skb_peek(&ptr->skb_head);
1268         else
1269                 skb_next = NULL;
1270
1271         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1272
1273         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1274                                 sizeof(struct txpd) : 0);
1275
1276         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1277                 /* Queue the packet back at the head */
1278                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1279
1280                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1281                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1282                                                ra_list_flags);
1283                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1284                         return;
1285                 }
1286
1287                 skb_queue_tail(&ptr->skb_head, skb);
1288
1289                 ptr->total_pkt_count++;
1290                 ptr->ba_pkt_count++;
1291                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1292                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1293                                        ra_list_flags);
1294         } else {
1295                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1296                 atomic_dec(&priv->wmm.tx_pkts_queued);
1297         }
1298 }
1299
1300 /*
1301  * This function checks if the first packet in the given RA list
1302  * is already processed or not.
1303  */
1304 static int
1305 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1306                          struct mwifiex_ra_list_tbl *ptr)
1307 {
1308         struct sk_buff *skb;
1309         struct mwifiex_txinfo *tx_info;
1310
1311         if (skb_queue_empty(&ptr->skb_head))
1312                 return false;
1313
1314         skb = skb_peek(&ptr->skb_head);
1315
1316         tx_info = MWIFIEX_SKB_TXCB(skb);
1317         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1318                 return true;
1319
1320         return false;
1321 }
1322
1323 /*
1324  * This function sends a single processed packet to firmware for
1325  * transmission.
1326  */
1327 static void
1328 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1329                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1330                               unsigned long ra_list_flags)
1331                                 __releases(&priv->wmm.ra_list_spinlock)
1332 {
1333         struct mwifiex_tx_param tx_param;
1334         struct mwifiex_adapter *adapter = priv->adapter;
1335         int ret = -1;
1336         struct sk_buff *skb, *skb_next;
1337         struct mwifiex_txinfo *tx_info;
1338
1339         if (skb_queue_empty(&ptr->skb_head)) {
1340                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1341                                        ra_list_flags);
1342                 return;
1343         }
1344
1345         skb = skb_dequeue(&ptr->skb_head);
1346
1347         if (adapter->data_sent || adapter->tx_lock_flag) {
1348                 ptr->total_pkt_count--;
1349                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1350                                        ra_list_flags);
1351                 skb_queue_tail(&adapter->tx_data_q, skb);
1352                 atomic_dec(&priv->wmm.tx_pkts_queued);
1353                 atomic_inc(&adapter->tx_queued);
1354                 return;
1355         }
1356
1357         if (!skb_queue_empty(&ptr->skb_head))
1358                 skb_next = skb_peek(&ptr->skb_head);
1359         else
1360                 skb_next = NULL;
1361
1362         tx_info = MWIFIEX_SKB_TXCB(skb);
1363
1364         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1365
1366         tx_param.next_pkt_len =
1367                 ((skb_next) ? skb_next->len +
1368                  sizeof(struct txpd) : 0);
1369         if (adapter->iface_type == MWIFIEX_USB) {
1370                 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
1371                                                    skb, &tx_param);
1372         } else {
1373                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1374                                                    skb, &tx_param);
1375         }
1376
1377         switch (ret) {
1378         case -EBUSY:
1379                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1380                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1381
1382                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1383                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1384                                                ra_list_flags);
1385                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1386                         return;
1387                 }
1388
1389                 skb_queue_tail(&ptr->skb_head, skb);
1390
1391                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1392                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1393                                        ra_list_flags);
1394                 break;
1395         case -1:
1396                 mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1397                 adapter->dbg.num_tx_host_to_card_failure++;
1398                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1399                 break;
1400         case -EINPROGRESS:
1401                 break;
1402         case 0:
1403                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1404         default:
1405                 break;
1406         }
1407         if (ret != -EBUSY) {
1408                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1409                 atomic_dec(&priv->wmm.tx_pkts_queued);
1410                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1411                 ptr->total_pkt_count--;
1412                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1413                                        ra_list_flags);
1414         }
1415 }
1416
1417 /*
1418  * This function dequeues a packet from the highest priority list
1419  * and transmits it.
1420  */
1421 static int
1422 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1423 {
1424         struct mwifiex_ra_list_tbl *ptr;
1425         struct mwifiex_private *priv = NULL;
1426         int ptr_index = 0;
1427         u8 ra[ETH_ALEN];
1428         int tid_del = 0, tid = 0;
1429         unsigned long flags;
1430
1431         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1432         if (!ptr)
1433                 return -1;
1434
1435         tid = mwifiex_get_tid(ptr);
1436
1437         mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1438
1439         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1440         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1441                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1442                 return -1;
1443         }
1444
1445         if (mwifiex_is_ptr_processed(priv, ptr)) {
1446                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1447                 /* ra_list_spinlock has been freed in
1448                    mwifiex_send_processed_packet() */
1449                 return 0;
1450         }
1451
1452         if (!ptr->is_11n_enabled ||
1453                 ptr->ba_status ||
1454                 priv->wps.session_enable) {
1455                 if (ptr->is_11n_enabled &&
1456                         ptr->ba_status &&
1457                         ptr->amsdu_in_ampdu &&
1458                         mwifiex_is_amsdu_allowed(priv, tid) &&
1459                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1460                                                         adapter->tx_buf_size))
1461                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1462                         /* ra_list_spinlock has been freed in
1463                          * mwifiex_11n_aggregate_pkt()
1464                          */
1465                 else
1466                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1467                         /* ra_list_spinlock has been freed in
1468                          * mwifiex_send_single_packet()
1469                          */
1470         } else {
1471                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1472                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1473                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1474                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1475                                                       BA_SETUP_INPROGRESS);
1476                                 mwifiex_send_addba(priv, tid, ptr->ra);
1477                         } else if (mwifiex_find_stream_to_delete
1478                                    (priv, tid, &tid_del, ra)) {
1479                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1480                                                       BA_SETUP_INPROGRESS);
1481                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1482                         }
1483                 }
1484                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1485                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1486                                                         adapter->tx_buf_size))
1487                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1488                         /* ra_list_spinlock has been freed in
1489                            mwifiex_11n_aggregate_pkt() */
1490                 else
1491                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1492                         /* ra_list_spinlock has been freed in
1493                            mwifiex_send_single_packet() */
1494         }
1495         return 0;
1496 }
1497
1498 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1499 {
1500         struct mwifiex_tx_param tx_param;
1501         struct sk_buff *skb;
1502         struct mwifiex_txinfo *tx_info;
1503         struct mwifiex_private *priv;
1504         int i;
1505
1506         if (adapter->data_sent || adapter->tx_lock_flag)
1507                 return;
1508
1509         for (i = 0; i < adapter->priv_num; ++i) {
1510                 priv = adapter->priv[i];
1511
1512                 if (!priv)
1513                         continue;
1514
1515                 if (adapter->if_ops.is_port_ready &&
1516                     !adapter->if_ops.is_port_ready(priv))
1517                         continue;
1518
1519                 if (skb_queue_empty(&priv->bypass_txq))
1520                         continue;
1521
1522                 skb = skb_dequeue(&priv->bypass_txq);
1523                 tx_info = MWIFIEX_SKB_TXCB(skb);
1524
1525                 /* no aggregation for bypass packets */
1526                 tx_param.next_pkt_len = 0;
1527
1528                 if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1529                         skb_queue_head(&priv->bypass_txq, skb);
1530                         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1531                 } else {
1532                         atomic_dec(&adapter->bypass_tx_pending);
1533                 }
1534         }
1535 }
1536
1537 /*
1538  * This function transmits the highest priority packet awaiting in the
1539  * WMM Queues.
1540  */
1541 void
1542 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1543 {
1544         do {
1545                 if (mwifiex_dequeue_tx_packet(adapter))
1546                         break;
1547                 if (adapter->iface_type != MWIFIEX_SDIO) {
1548                         if (adapter->data_sent ||
1549                             adapter->tx_lock_flag)
1550                                 break;
1551                 } else {
1552                         if (atomic_read(&adapter->tx_queued) >=
1553                             MWIFIEX_MAX_PKTS_TXQ)
1554                                 break;
1555                 }
1556         } while (!mwifiex_wmm_lists_empty(adapter));
1557 }