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