drivers/net/wireless/mwifiex/wmm.c

   1 /*
   2  * Marvell Wireless LAN device driver: WMM
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "wmm.h"
  26 #include "11n.h"
  27
  28
  29 /* Maximum value FW can accept for driver delay in packet transmission */
  30 #define DRV_PKT_DELAY_TO_FW_MAX   512
  31
  32
  33 #define WMM_QUEUED_PACKET_LOWER_LIMIT   180
  34
  35 #define WMM_QUEUED_PACKET_UPPER_LIMIT   200
  36
  37 /* Offset for TOS field in the IP header */
  38 #define IPTOS_OFFSET 5
  39
  40 static bool disable_tx_amsdu;
  41 module_param(disable_tx_amsdu, bool, 0644);
  42
  43 /* WMM information IE */
  44 static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
  45         0x00, 0x50, 0xf2, 0x02,
  46         0x00, 0x01, 0x00
  47 };
  48
  49 static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
  50         WMM_AC_BK,
  51         WMM_AC_VI,
  52         WMM_AC_VO
  53 };
  54
  55 static u8 tos_to_tid[] = {
  56         /* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
  57         0x01,                   /* 0 1 0 AC_BK */
  58         0x02,                   /* 0 0 0 AC_BK */
  59         0x00,                   /* 0 0 1 AC_BE */
  60         0x03,                   /* 0 1 1 AC_BE */
  61         0x04,                   /* 1 0 0 AC_VI */
  62         0x05,                   /* 1 0 1 AC_VI */
  63         0x06,                   /* 1 1 0 AC_VO */
  64         0x07                    /* 1 1 1 AC_VO */
  65 };
  66
  67 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
  68
  69 /*
  70  * This function debug prints the priority parameters for a WMM AC.
  71  */
  72 static void
  73 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
  74 {
  75         const char *ac_str[] = { "BK", "BE", "VI", "VO" };
  76
  77         pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
  78                  "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
  79                  ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
  80                                              & MWIFIEX_ACI) >> 5]],
  81                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
  82                  (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
  83                  ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
  84                  ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
  85                  (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
  86                  le16_to_cpu(ac_param->tx_op_limit));
  87 }
  88
  89 /*
  90  * This function allocates a route address list.
  91  *
  92  * The function also initializes the list with the provided RA.
  93  */
  94 static struct mwifiex_ra_list_tbl *
  95 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, const u8 *ra)
  96 {
  97         struct mwifiex_ra_list_tbl *ra_list;
  98
  99         ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
 100         if (!ra_list)
 101                 return NULL;
 102
 103         INIT_LIST_HEAD(&ra_list->list);
 104         skb_queue_head_init(&ra_list->skb_head);
 105
 106         memcpy(ra_list->ra, ra, ETH_ALEN);
 107
 108         ra_list->total_pkt_count = 0;
 109
 110         mwifiex_dbg(adapter, INFO, "info: allocated ra_list %p\n", ra_list);
 111
 112         return ra_list;
 113 }
 114
 115 /* This function returns random no between 16 and 32 to be used as threshold
 116  * for no of packets after which BA setup is initiated.
 117  */
 118 static u8 mwifiex_get_random_ba_threshold(void)
 119 {
 120         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                 atomic_set(&priv->wmm.tx_pkts_queued, 0);
 442                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 443         }
 444 }
 445
 446 int mwifiex_bypass_txlist_empty(struct mwifiex_adapter *adapter)
 447 {
 448         struct mwifiex_private *priv;
 449         int i;
 450
 451         for (i = 0; i < adapter->priv_num; i++) {
 452                 priv = adapter->priv[i];
 453                 if (!priv)
 454                         continue;
 455                 if (adapter->if_ops.is_port_ready &&
 456                     !adapter->if_ops.is_port_ready(priv))
 457                         continue;
 458                 if (!skb_queue_empty(&priv->bypass_txq))
 459                         return false;
 460         }
 461
 462         return true;
 463 }
 464
 465 /*
 466  * This function checks if WMM Tx queue is empty.
 467  */
 468 int
 469 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 470 {
 471         int i;
 472         struct mwifiex_private *priv;
 473
 474         for (i = 0; i < adapter->priv_num; ++i) {
 475                 priv = adapter->priv[i];
 476                 if (!priv)
 477                         continue;
 478                 if (!priv->port_open &&
 479                     (priv->bss_mode != NL80211_IFTYPE_ADHOC))
 480                         continue;
 481                 if (adapter->if_ops.is_port_ready &&
 482                     !adapter->if_ops.is_port_ready(priv))
 483                         continue;
 484                 if (atomic_read(&priv->wmm.tx_pkts_queued))
 485                         return false;
 486         }
 487
 488         return true;
 489 }
 490
 491 /*
 492  * This function deletes all packets in an RA list node.
 493  *
 494  * The packet sent completion callback handler are called with
 495  * status failure, after they are dequeued to ensure proper
 496  * cleanup. The RA list node itself is freed at the end.
 497  */
 498 static void
 499 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 500                                     struct mwifiex_ra_list_tbl *ra_list)
 501 {
 502         struct mwifiex_adapter *adapter = priv->adapter;
 503         struct sk_buff *skb, *tmp;
 504
 505         skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
 506                 skb_unlink(skb, &ra_list->skb_head);
 507                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 508         }
 509 }
 510
 511 /*
 512  * This function deletes all packets in an RA list.
 513  *
 514  * Each nodes in the RA list are freed individually first, and then
 515  * the RA list itself is freed.
 516  */
 517 static void
 518 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 519                                struct list_head *ra_list_head)
 520 {
 521         struct mwifiex_ra_list_tbl *ra_list;
 522
 523         list_for_each_entry(ra_list, ra_list_head, list)
 524                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 525 }
 526
 527 /*
 528  * This function deletes all packets in all RA lists.
 529  */
 530 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 531 {
 532         int i;
 533
 534         for (i = 0; i < MAX_NUM_TID; i++)
 535                 mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 536                                                                        ra_list);
 537
 538         atomic_set(&priv->wmm.tx_pkts_queued, 0);
 539         atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 540 }
 541
 542 /*
 543  * This function deletes all route addresses from all RA lists.
 544  */
 545 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 546 {
 547         struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 548         int i;
 549
 550         for (i = 0; i < MAX_NUM_TID; ++i) {
 551                 mwifiex_dbg(priv->adapter, INFO,
 552                             "info: ra_list: freeing buf for tid %d\n", i);
 553                 list_for_each_entry_safe(ra_list, tmp_node,
 554                                          &priv->wmm.tid_tbl_ptr[i].ra_list,
 555                                          list) {
 556                         list_del(&ra_list->list);
 557                         kfree(ra_list);
 558                 }
 559
 560                 INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 561         }
 562 }
 563
 564 static int mwifiex_free_ack_frame(int id, void *p, void *data)
 565 {
 566         pr_warn("Have pending ack frames!\n");
 567         kfree_skb(p);
 568         return 0;
 569 }
 570
 571 /*
 572  * This function cleans up the Tx and Rx queues.
 573  *
 574  * Cleanup includes -
 575  *      - All packets in RA lists
 576  *      - All entries in Rx reorder table
 577  *      - All entries in Tx BA stream table
 578  *      - MPA buffer (if required)
 579  *      - All RA lists
 580  */
 581 void
 582 mwifiex_clean_txrx(struct mwifiex_private *priv)
 583 {
 584         unsigned long flags;
 585         struct sk_buff *skb, *tmp;
 586
 587         mwifiex_11n_cleanup_reorder_tbl(priv);
 588         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 589
 590         mwifiex_wmm_cleanup_queues(priv);
 591         mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 592
 593         if (priv->adapter->if_ops.cleanup_mpa_buf)
 594                 priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 595
 596         mwifiex_wmm_delete_all_ralist(priv);
 597         memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 598
 599         if (priv->adapter->if_ops.clean_pcie_ring &&
 600             !priv->adapter->surprise_removed)
 601                 priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 602         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 603
 604         skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
 605                 skb_unlink(skb, &priv->tdls_txq);
 606                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 607         }
 608
 609         skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
 610                 skb_unlink(skb, &priv->bypass_txq);
 611                 mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
 612         }
 613         atomic_set(&priv->adapter->bypass_tx_pending, 0);
 614
 615         idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
 616         idr_destroy(&priv->ack_status_frames);
 617 }
 618
 619 /*
 620  * This function retrieves a particular RA list node, matching with the
 621  * given TID and RA address.
 622  */
 623 struct mwifiex_ra_list_tbl *
 624 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 625                             const u8 *ra_addr)
 626 {
 627         struct mwifiex_ra_list_tbl *ra_list;
 628
 629         list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 630                             list) {
 631                 if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 632                         return ra_list;
 633         }
 634
 635         return NULL;
 636 }
 637
 638 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
 639                                     u8 tx_pause)
 640 {
 641         struct mwifiex_ra_list_tbl *ra_list;
 642         u32 pkt_cnt = 0, tx_pkts_queued;
 643         unsigned long flags;
 644         int i;
 645
 646         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 647
 648         for (i = 0; i < MAX_NUM_TID; ++i) {
 649                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
 650                 if (ra_list && ra_list->tx_paused != tx_pause) {
 651                         pkt_cnt += ra_list->total_pkt_count;
 652                         ra_list->tx_paused = tx_pause;
 653                         if (tx_pause)
 654                                 priv->wmm.pkts_paused[i] +=
 655                                         ra_list->total_pkt_count;
 656                         else
 657                                 priv->wmm.pkts_paused[i] -=
 658                                         ra_list->total_pkt_count;
 659                 }
 660         }
 661
 662         if (pkt_cnt) {
 663                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 664                 if (tx_pause)
 665                         tx_pkts_queued -= pkt_cnt;
 666                 else
 667                         tx_pkts_queued += pkt_cnt;
 668
 669                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 670                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 671         }
 672         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 673 }
 674
 675 /* This function update non-tdls peer ralist tx_pause while
 676  * tdls channel swithing
 677  */
 678 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
 679                                                u8 *mac, u8 tx_pause)
 680 {
 681         struct mwifiex_ra_list_tbl *ra_list;
 682         u32 pkt_cnt = 0, tx_pkts_queued;
 683         unsigned long flags;
 684         int i;
 685
 686         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 687
 688         for (i = 0; i < MAX_NUM_TID; ++i) {
 689                 list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
 690                                     list) {
 691                         if (!memcmp(ra_list->ra, mac, ETH_ALEN))
 692                                 continue;
 693
 694                         if (ra_list->tx_paused != tx_pause) {
 695                                 pkt_cnt += ra_list->total_pkt_count;
 696                                 ra_list->tx_paused = tx_pause;
 697                                 if (tx_pause)
 698                                         priv->wmm.pkts_paused[i] +=
 699                                                 ra_list->total_pkt_count;
 700                                 else
 701                                         priv->wmm.pkts_paused[i] -=
 702                                                 ra_list->total_pkt_count;
 703                         }
 704                 }
 705         }
 706
 707         if (pkt_cnt) {
 708                 tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
 709                 if (tx_pause)
 710                         tx_pkts_queued -= pkt_cnt;
 711                 else
 712                         tx_pkts_queued += pkt_cnt;
 713
 714                 atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
 715                 atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 716         }
 717         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 718 }
 719
 720 /*
 721  * This function retrieves an RA list node for a given TID and
 722  * RA address pair.
 723  *
 724  * If no such node is found, a new node is added first and then
 725  * retrieved.
 726  */
 727 struct mwifiex_ra_list_tbl *
 728 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
 729                             const u8 *ra_addr)
 730 {
 731         struct mwifiex_ra_list_tbl *ra_list;
 732
 733         ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 734         if (ra_list)
 735                 return ra_list;
 736         mwifiex_ralist_add(priv, ra_addr);
 737
 738         return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 739 }
 740
 741 /*
 742  * This function deletes RA list nodes for given mac for all TIDs.
 743  * Function also decrements TX pending count accordingly.
 744  */
 745 void
 746 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
 747 {
 748         struct mwifiex_ra_list_tbl *ra_list;
 749         unsigned long flags;
 750         int i;
 751
 752         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 753
 754         for (i = 0; i < MAX_NUM_TID; ++i) {
 755                 ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
 756
 757                 if (!ra_list)
 758                         continue;
 759                 mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 760                 if (ra_list->tx_paused)
 761                         priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
 762                 else
 763                         atomic_sub(ra_list->total_pkt_count,
 764                                    &priv->wmm.tx_pkts_queued);
 765                 list_del(&ra_list->list);
 766                 kfree(ra_list);
 767         }
 768         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 769 }
 770
 771 /*
 772  * This function checks if a particular RA list node exists in a given TID
 773  * table index.
 774  */
 775 int
 776 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 777                         struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 778 {
 779         struct mwifiex_ra_list_tbl *rlist;
 780
 781         list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 782                             list) {
 783                 if (rlist == ra_list)
 784                         return true;
 785         }
 786
 787         return false;
 788 }
 789
 790 /*
 791  * This function adds a packet to bypass TX queue.
 792  * This is special TX queue for packets which can be sent even when port_open
 793  * is false.
 794  */
 795 void
 796 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
 797                                    struct sk_buff *skb)
 798 {
 799         skb_queue_tail(&priv->bypass_txq, skb);
 800 }
 801
 802 /*
 803  * This function adds a packet to WMM queue.
 804  *
 805  * In disconnected state the packet is immediately dropped and the
 806  * packet send completion callback is called with status failure.
 807  *
 808  * Otherwise, the correct RA list node is located and the packet
 809  * is queued at the list tail.
 810  */
 811 void
 812 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 813                             struct sk_buff *skb)
 814 {
 815         struct mwifiex_adapter *adapter = priv->adapter;
 816         u32 tid;
 817         struct mwifiex_ra_list_tbl *ra_list;
 818         u8 ra[ETH_ALEN], tid_down;
 819         unsigned long flags;
 820         struct list_head list_head;
 821         int tdls_status = TDLS_NOT_SETUP;
 822         struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
 823         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 824
 825         memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
 826
 827         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
 828             ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
 829                 if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
 830                         mwifiex_dbg(adapter, DATA,
 831                                     "TDLS setup packet for %pM.\t"
 832                                     "Don't block\n", ra);
 833                 else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
 834                         tdls_status = mwifiex_get_tdls_link_status(priv, ra);
 835         }
 836
 837         if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 838                 mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
 839                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 840                 return;
 841         }
 842
 843         tid = skb->priority;
 844
 845         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 846
 847         tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 848
 849         /* In case of infra as we have already created the list during
 850            association we just don't have to call get_queue_raptr, we will
 851            have only 1 raptr for a tid in case of infra */
 852         if (!mwifiex_queuing_ra_based(priv) &&
 853             !mwifiex_is_skb_mgmt_frame(skb)) {
 854                 switch (tdls_status) {
 855                 case TDLS_SETUP_COMPLETE:
 856                 case TDLS_CHAN_SWITCHING:
 857                 case TDLS_IN_BASE_CHAN:
 858                 case TDLS_IN_OFF_CHAN:
 859                         ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
 860                                                               ra);
 861                         tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
 862                         break;
 863                 case TDLS_SETUP_INPROGRESS:
 864                         skb_queue_tail(&priv->tdls_txq, skb);
 865                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 866                                                flags);
 867                         return;
 868                 default:
 869                         list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
 870                         if (!list_empty(&list_head))
 871                                 ra_list = list_first_entry(
 872                                         &list_head, struct mwifiex_ra_list_tbl,
 873                                         list);
 874                         else
 875                                 ra_list = NULL;
 876                         break;
 877                 }
 878         } else {
 879                 memcpy(ra, skb->data, ETH_ALEN);
 880                 if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 881                         eth_broadcast_addr(ra);
 882                 ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 883         }
 884
 885         if (!ra_list) {
 886                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 887                 mwifiex_write_data_complete(adapter, skb, 0, -1);
 888                 return;
 889         }
 890
 891         skb_queue_tail(&ra_list->skb_head, skb);
 892
 893         ra_list->ba_pkt_count++;
 894         ra_list->total_pkt_count++;
 895
 896         if (atomic_read(&priv->wmm.highest_queued_prio) <
 897                                                 priv->tos_to_tid_inv[tid_down])
 898                 atomic_set(&priv->wmm.highest_queued_prio,
 899                            priv->tos_to_tid_inv[tid_down]);
 900
 901         if (ra_list->tx_paused)
 902                 priv->wmm.pkts_paused[tid_down]++;
 903         else
 904                 atomic_inc(&priv->wmm.tx_pkts_queued);
 905
 906         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 907 }
 908
 909 /*
 910  * This function processes the get WMM status command response from firmware.
 911  *
 912  * The response may contain multiple TLVs -
 913  *      - AC Queue status TLVs
 914  *      - Current WMM Parameter IE TLV
 915  *      - Admission Control action frame TLVs
 916  *
 917  * This function parses the TLVs and then calls further specific functions
 918  * to process any changes in the queue prioritize or state.
 919  */
 920 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 921                                const struct host_cmd_ds_command *resp)
 922 {
 923         u8 *curr = (u8 *) &resp->params.get_wmm_status;
 924         uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 925         int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
 926         bool valid = true;
 927
 928         struct mwifiex_ie_types_data *tlv_hdr;
 929         struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 930         struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 931         struct mwifiex_wmm_ac_status *ac_status;
 932
 933         mwifiex_dbg(priv->adapter, INFO,
 934                     "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 935                     resp_len);
 936
 937         while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 938                 tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 939                 tlv_len = le16_to_cpu(tlv_hdr->header.len);
 940
 941                 if (resp_len < tlv_len + sizeof(tlv_hdr->header))
 942                         break;
 943
 944                 switch (le16_to_cpu(tlv_hdr->header.type)) {
 945                 case TLV_TYPE_WMMQSTATUS:
 946                         tlv_wmm_qstatus =
 947                                 (struct mwifiex_ie_types_wmm_queue_status *)
 948                                 tlv_hdr;
 949                         mwifiex_dbg(priv->adapter, CMD,
 950                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 951                                     "QSTATUS TLV: %d, %d, %d\n",
 952                                     tlv_wmm_qstatus->queue_index,
 953                                     tlv_wmm_qstatus->flow_required,
 954                                     tlv_wmm_qstatus->disabled);
 955
 956                         ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 957                                                          queue_index];
 958                         ac_status->disabled = tlv_wmm_qstatus->disabled;
 959                         ac_status->flow_required =
 960                                                 tlv_wmm_qstatus->flow_required;
 961                         ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 962                         break;
 963
 964                 case WLAN_EID_VENDOR_SPECIFIC:
 965                         /*
 966                          * Point the regular IEEE IE 2 bytes into the Marvell IE
 967                          *   and setup the IEEE IE type and length byte fields
 968                          */
 969
 970                         wmm_param_ie =
 971                                 (struct ieee_types_wmm_parameter *) (curr +
 972                                                                     2);
 973                         wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 974                         wmm_param_ie->vend_hdr.element_id =
 975                                                 WLAN_EID_VENDOR_SPECIFIC;
 976
 977                         mwifiex_dbg(priv->adapter, CMD,
 978                                     "info: CMD_RESP: WMM_GET_STATUS:\t"
 979                                     "WMM Parameter Set Count: %d\n",
 980                                     wmm_param_ie->qos_info_bitmap & mask);
 981
 982                         if (wmm_param_ie->vend_hdr.len + 2 >
 983                                 sizeof(struct ieee_types_wmm_parameter))
 984                                 break;
 985
 986                         memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 987                                wmm_ie, wmm_param_ie,
 988                                wmm_param_ie->vend_hdr.len + 2);
 989
 990                         break;
 991
 992                 default:
 993                         valid = false;
 994                         break;
 995                 }
 996
 997                 curr += (tlv_len + sizeof(tlv_hdr->header));
 998                 resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 999         }
1000
1001         mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
1002         mwifiex_wmm_setup_ac_downgrade(priv);
1003
1004         return 0;
1005 }
1006
1007 /*
1008  * Callback handler from the command module to allow insertion of a WMM TLV.
1009  *
1010  * If the BSS we are associating to supports WMM, this function adds the
1011  * required WMM Information IE to the association request command buffer in
1012  * the form of a Marvell extended IEEE IE.
1013  */
1014 u32
1015 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
1016                                     u8 **assoc_buf,
1017                                     struct ieee_types_wmm_parameter *wmm_ie,
1018                                     struct ieee80211_ht_cap *ht_cap)
1019 {
1020         struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
1021         u32 ret_len = 0;
1022
1023         /* Null checks */
1024         if (!assoc_buf)
1025                 return 0;
1026         if (!(*assoc_buf))
1027                 return 0;
1028
1029         if (!wmm_ie)
1030                 return 0;
1031
1032         mwifiex_dbg(priv->adapter, INFO,
1033                     "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1034                     wmm_ie->vend_hdr.element_id);
1035
1036         if ((priv->wmm_required ||
1037              (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1038              priv->adapter->config_bands & BAND_AN))) &&
1039             wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1040                 wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1041                 wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1042                 wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1043                 memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1044                        le16_to_cpu(wmm_tlv->header.len));
1045                 if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1046                         memcpy((u8 *) (wmm_tlv->wmm_ie
1047                                        + le16_to_cpu(wmm_tlv->header.len)
1048                                        - sizeof(priv->wmm_qosinfo)),
1049                                &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1050
1051                 ret_len = sizeof(wmm_tlv->header)
1052                           + le16_to_cpu(wmm_tlv->header.len);
1053
1054                 *assoc_buf += ret_len;
1055         }
1056
1057         return ret_len;
1058 }
1059
1060 /*
1061  * This function computes the time delay in the driver queues for a
1062  * given packet.
1063  *
1064  * When the packet is received at the OS/Driver interface, the current
1065  * time is set in the packet structure. The difference between the present
1066  * time and that received time is computed in this function and limited
1067  * based on pre-compiled limits in the driver.
1068  */
1069 u8
1070 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1071                                   const struct sk_buff *skb)
1072 {
1073         u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1074         u8 ret_val;
1075
1076         /*
1077          * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1078          *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1079          *
1080          * Pass max value if queue_delay is beyond the uint8 range
1081          */
1082         ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1083
1084         mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1085                     "%d ms sent to FW\n", queue_delay, ret_val);
1086
1087         return ret_val;
1088 }
1089
1090 /*
1091  * This function retrieves the highest priority RA list table pointer.
1092  */
1093 static struct mwifiex_ra_list_tbl *
1094 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1095                                      struct mwifiex_private **priv, int *tid)
1096 {
1097         struct mwifiex_private *priv_tmp;
1098         struct mwifiex_ra_list_tbl *ptr;
1099         struct mwifiex_tid_tbl *tid_ptr;
1100         atomic_t *hqp;
1101         unsigned long flags_ra;
1102         int i, j;
1103
1104         /* check the BSS with highest priority first */
1105         for (j = adapter->priv_num - 1; j >= 0; --j) {
1106                 /* iterate over BSS with the equal priority */
1107                 list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1108                                     &adapter->bss_prio_tbl[j].bss_prio_head,
1109                                     list) {
1110
1111                         priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1112
1113                         if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
1114                              !priv_tmp->port_open) ||
1115                             (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1116                                 continue;
1117
1118                         if (adapter->if_ops.is_port_ready &&
1119                             !adapter->if_ops.is_port_ready(priv_tmp))
1120                                 continue;
1121
1122                         /* iterate over the WMM queues of the BSS */
1123                         hqp = &priv_tmp->wmm.highest_queued_prio;
1124                         for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1125
1126                                 spin_lock_irqsave(&priv_tmp->wmm.
1127                                                   ra_list_spinlock, flags_ra);
1128
1129                                 tid_ptr = &(priv_tmp)->wmm.
1130                                         tid_tbl_ptr[tos_to_tid[i]];
1131
1132                                 /* iterate over receiver addresses */
1133                                 list_for_each_entry(ptr, &tid_ptr->ra_list,
1134                                                     list) {
1135
1136                                         if (!ptr->tx_paused &&
1137                                             !skb_queue_empty(&ptr->skb_head))
1138                                                 /* holds both locks */
1139                                                 goto found;
1140                                 }
1141
1142                                 spin_unlock_irqrestore(&priv_tmp->wmm.
1143                                                        ra_list_spinlock,
1144                                                        flags_ra);
1145                         }
1146                 }
1147
1148         }
1149
1150         return NULL;
1151
1152 found:
1153         /* holds ra_list_spinlock */
1154         if (atomic_read(hqp) > i)
1155                 atomic_set(hqp, i);
1156         spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
1157
1158         *priv = priv_tmp;
1159         *tid = tos_to_tid[i];
1160
1161         return ptr;
1162 }
1163
1164 /* This functions rotates ra and bss lists so packets are picked round robin.
1165  *
1166  * After a packet is successfully transmitted, rotate the ra list, so the ra
1167  * next to the one transmitted, will come first in the list. This way we pick
1168  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1169  * priority.
1170  *
1171  * Function also increments wmm.packets_out counter.
1172  */
1173 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1174                                  struct mwifiex_ra_list_tbl *ra,
1175                                  int tid)
1176 {
1177         struct mwifiex_adapter *adapter = priv->adapter;
1178         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1179         struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1180         unsigned long flags;
1181
1182         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
1183         /*
1184          * dirty trick: we remove 'head' temporarily and reinsert it after
1185          * curr bss node. imagine list to stay fixed while head is moved
1186          */
1187         list_move(&tbl[priv->bss_priority].bss_prio_head,
1188                   &tbl[priv->bss_priority].bss_prio_cur->list);
1189         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
1190
1191         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1192         if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1193                 priv->wmm.packets_out[tid]++;
1194                 /* same as above */
1195                 list_move(&tid_ptr->ra_list, &ra->list);
1196         }
1197         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1198 }
1199
1200 /*
1201  * This function checks if 11n aggregation is possible.
1202  */
1203 static int
1204 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1205                                     struct mwifiex_ra_list_tbl *ptr,
1206                                     int max_buf_size)
1207 {
1208         int count = 0, total_size = 0;
1209         struct sk_buff *skb, *tmp;
1210         int max_amsdu_size;
1211
1212         if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1213             ptr->is_11n_enabled)
1214                 max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1215         else
1216                 max_amsdu_size = max_buf_size;
1217
1218         skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1219                 total_size += skb->len;
1220                 if (total_size >= max_amsdu_size)
1221                         break;
1222                 if (++count >= MIN_NUM_AMSDU)
1223                         return true;
1224         }
1225
1226         return false;
1227 }
1228
1229 /*
1230  * This function sends a single packet to firmware for transmission.
1231  */
1232 static void
1233 mwifiex_send_single_packet(struct mwifiex_private *priv,
1234                            struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1235                            unsigned long ra_list_flags)
1236                            __releases(&priv->wmm.ra_list_spinlock)
1237 {
1238         struct sk_buff *skb, *skb_next;
1239         struct mwifiex_tx_param tx_param;
1240         struct mwifiex_adapter *adapter = priv->adapter;
1241         struct mwifiex_txinfo *tx_info;
1242
1243         if (skb_queue_empty(&ptr->skb_head)) {
1244                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1245                                        ra_list_flags);
1246                 mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1247                 return;
1248         }
1249
1250         skb = skb_dequeue(&ptr->skb_head);
1251
1252         tx_info = MWIFIEX_SKB_TXCB(skb);
1253         mwifiex_dbg(adapter, DATA,
1254                     "data: dequeuing the packet %p %p\n", ptr, skb);
1255
1256         ptr->total_pkt_count--;
1257
1258         if (!skb_queue_empty(&ptr->skb_head))
1259                 skb_next = skb_peek(&ptr->skb_head);
1260         else
1261                 skb_next = NULL;
1262
1263         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1264
1265         tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1266                                 sizeof(struct txpd) : 0);
1267
1268         if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1269                 /* Queue the packet back at the head */
1270                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1271
1272                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1273                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1274                                                ra_list_flags);
1275                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1276                         return;
1277                 }
1278
1279                 skb_queue_tail(&ptr->skb_head, skb);
1280
1281                 ptr->total_pkt_count++;
1282                 ptr->ba_pkt_count++;
1283                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1284                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1285                                        ra_list_flags);
1286         } else {
1287                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1288                 atomic_dec(&priv->wmm.tx_pkts_queued);
1289         }
1290 }
1291
1292 /*
1293  * This function checks if the first packet in the given RA list
1294  * is already processed or not.
1295  */
1296 static int
1297 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1298                          struct mwifiex_ra_list_tbl *ptr)
1299 {
1300         struct sk_buff *skb;
1301         struct mwifiex_txinfo *tx_info;
1302
1303         if (skb_queue_empty(&ptr->skb_head))
1304                 return false;
1305
1306         skb = skb_peek(&ptr->skb_head);
1307
1308         tx_info = MWIFIEX_SKB_TXCB(skb);
1309         if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1310                 return true;
1311
1312         return false;
1313 }
1314
1315 /*
1316  * This function sends a single processed packet to firmware for
1317  * transmission.
1318  */
1319 static void
1320 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1321                               struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1322                               unsigned long ra_list_flags)
1323                                 __releases(&priv->wmm.ra_list_spinlock)
1324 {
1325         struct mwifiex_tx_param tx_param;
1326         struct mwifiex_adapter *adapter = priv->adapter;
1327         int ret = -1;
1328         struct sk_buff *skb, *skb_next;
1329         struct mwifiex_txinfo *tx_info;
1330
1331         if (skb_queue_empty(&ptr->skb_head)) {
1332                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1333                                        ra_list_flags);
1334                 return;
1335         }
1336
1337         skb = skb_dequeue(&ptr->skb_head);
1338
1339         if (adapter->data_sent || adapter->tx_lock_flag) {
1340                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1341                                        ra_list_flags);
1342                 skb_queue_tail(&adapter->tx_data_q, skb);
1343                 atomic_inc(&adapter->tx_queued);
1344                 return;
1345         }
1346
1347         if (!skb_queue_empty(&ptr->skb_head))
1348                 skb_next = skb_peek(&ptr->skb_head);
1349         else
1350                 skb_next = NULL;
1351
1352         tx_info = MWIFIEX_SKB_TXCB(skb);
1353
1354         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1355
1356         if (adapter->iface_type == MWIFIEX_USB) {
1357                 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
1358                                                    skb, NULL);
1359         } else {
1360                 tx_param.next_pkt_len =
1361                         ((skb_next) ? skb_next->len +
1362                          sizeof(struct txpd) : 0);
1363                 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1364                                                    skb, &tx_param);
1365         }
1366
1367         switch (ret) {
1368         case -EBUSY:
1369                 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1370                 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1371
1372                 if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1373                         spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1374                                                ra_list_flags);
1375                         mwifiex_write_data_complete(adapter, skb, 0, -1);
1376                         return;
1377                 }
1378
1379                 skb_queue_tail(&ptr->skb_head, skb);
1380
1381                 tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1382                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1383                                        ra_list_flags);
1384                 break;
1385         case -1:
1386                 mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1387                 adapter->dbg.num_tx_host_to_card_failure++;
1388                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1389                 break;
1390         case -EINPROGRESS:
1391                 break;
1392         case 0:
1393                 mwifiex_write_data_complete(adapter, skb, 0, ret);
1394         default:
1395                 break;
1396         }
1397         if (ret != -EBUSY) {
1398                 mwifiex_rotate_priolists(priv, ptr, ptr_index);
1399                 atomic_dec(&priv->wmm.tx_pkts_queued);
1400         }
1401 }
1402
1403 /*
1404  * This function dequeues a packet from the highest priority list
1405  * and transmits it.
1406  */
1407 static int
1408 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1409 {
1410         struct mwifiex_ra_list_tbl *ptr;
1411         struct mwifiex_private *priv = NULL;
1412         int ptr_index = 0;
1413         u8 ra[ETH_ALEN];
1414         int tid_del = 0, tid = 0;
1415         unsigned long flags;
1416
1417         ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1418         if (!ptr)
1419                 return -1;
1420
1421         tid = mwifiex_get_tid(ptr);
1422
1423         mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1424
1425         spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1426         if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1427                 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1428                 return -1;
1429         }
1430
1431         if (mwifiex_is_ptr_processed(priv, ptr)) {
1432                 mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1433                 /* ra_list_spinlock has been freed in
1434                    mwifiex_send_processed_packet() */
1435                 return 0;
1436         }
1437
1438         if (!ptr->is_11n_enabled ||
1439                 ptr->ba_status ||
1440                 priv->wps.session_enable) {
1441                 if (ptr->is_11n_enabled &&
1442                         ptr->ba_status &&
1443                         ptr->amsdu_in_ampdu &&
1444                         mwifiex_is_amsdu_allowed(priv, tid) &&
1445                         mwifiex_is_11n_aggragation_possible(priv, ptr,
1446                                                         adapter->tx_buf_size))
1447                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1448                         /* ra_list_spinlock has been freed in
1449                          * mwifiex_11n_aggregate_pkt()
1450                          */
1451                 else
1452                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1453                         /* ra_list_spinlock has been freed in
1454                          * mwifiex_send_single_packet()
1455                          */
1456         } else {
1457                 if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1458                     ptr->ba_pkt_count > ptr->ba_packet_thr) {
1459                         if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1460                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1461                                                       BA_SETUP_INPROGRESS);
1462                                 mwifiex_send_addba(priv, tid, ptr->ra);
1463                         } else if (mwifiex_find_stream_to_delete
1464                                    (priv, tid, &tid_del, ra)) {
1465                                 mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1466                                                       BA_SETUP_INPROGRESS);
1467                                 mwifiex_send_delba(priv, tid_del, ra, 1);
1468                         }
1469                 }
1470                 if (mwifiex_is_amsdu_allowed(priv, tid) &&
1471                     mwifiex_is_11n_aggragation_possible(priv, ptr,
1472                                                         adapter->tx_buf_size))
1473                         mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1474                         /* ra_list_spinlock has been freed in
1475                            mwifiex_11n_aggregate_pkt() */
1476                 else
1477                         mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1478                         /* ra_list_spinlock has been freed in
1479                            mwifiex_send_single_packet() */
1480         }
1481         return 0;
1482 }
1483
1484 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1485 {
1486         struct mwifiex_tx_param tx_param;
1487         struct sk_buff *skb;
1488         struct mwifiex_txinfo *tx_info;
1489         struct mwifiex_private *priv;
1490         int i;
1491
1492         if (adapter->data_sent || adapter->tx_lock_flag)
1493                 return;
1494
1495         for (i = 0; i < adapter->priv_num; ++i) {
1496                 priv = adapter->priv[i];
1497
1498                 if (!priv)
1499                         continue;
1500
1501                 if (adapter->if_ops.is_port_ready &&
1502                     !adapter->if_ops.is_port_ready(priv))
1503                         continue;
1504
1505                 if (skb_queue_empty(&priv->bypass_txq))
1506                         continue;
1507
1508                 skb = skb_dequeue(&priv->bypass_txq);
1509                 tx_info = MWIFIEX_SKB_TXCB(skb);
1510
1511                 /* no aggregation for bypass packets */
1512                 tx_param.next_pkt_len = 0;
1513
1514                 if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1515                         skb_queue_head(&priv->bypass_txq, skb);
1516                         tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1517                 } else {
1518                         atomic_dec(&adapter->bypass_tx_pending);
1519                 }
1520         }
1521 }
1522
1523 /*
1524  * This function transmits the highest priority packet awaiting in the
1525  * WMM Queues.
1526  */
1527 void
1528 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1529 {
1530         do {
1531                 if (mwifiex_dequeue_tx_packet(adapter))
1532                         break;
1533                 if (adapter->iface_type != MWIFIEX_SDIO) {
1534                         if (adapter->data_sent ||
1535                             adapter->tx_lock_flag)
1536                                 break;
1537                 } else {
1538                         if (atomic_read(&adapter->tx_queued) >=
1539                             MWIFIEX_MAX_PKTS_TXQ)
1540                                 break;
1541                 }
1542         } while (!mwifiex_wmm_lists_empty(adapter));
1543 }