drivers/net/wireless/mwifiex/main.c

   1 /*
   2  * Marvell Wireless LAN device driver: major functions
   3  *
   4  * Copyright (C) 2011, 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 "main.h"
  21 #include "wmm.h"
  22 #include "cfg80211.h"
  23 #include "11n.h"
  24
  25 #define VERSION "1.0"
  26
  27 const char driver_version[] = "mwifiex " VERSION " (%s) ";
  28 static char *cal_data_cfg;
  29 module_param(cal_data_cfg, charp, 0);
  30
  31 static void scan_delay_timer_fn(unsigned long data)
  32 {
  33         struct mwifiex_private *priv = (struct mwifiex_private *)data;
  34         struct mwifiex_adapter *adapter = priv->adapter;
  35         struct cmd_ctrl_node *cmd_node, *tmp_node;
  36         unsigned long flags;
  37
  38         if (adapter->surprise_removed)
  39                 return;
  40
  41         if (adapter->scan_delay_cnt == MWIFIEX_MAX_SCAN_DELAY_CNT) {
  42                 /*
  43                  * Abort scan operation by cancelling all pending scan
  44                  * commands
  45                  */
  46                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  47                 list_for_each_entry_safe(cmd_node, tmp_node,
  48                                          &adapter->scan_pending_q, list) {
  49                         list_del(&cmd_node->list);
  50                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
  51                 }
  52                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
  53
  54                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
  55                 adapter->scan_processing = false;
  56                 adapter->scan_delay_cnt = 0;
  57                 adapter->empty_tx_q_cnt = 0;
  58                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
  59
  60                 if (priv->scan_request) {
  61                         dev_dbg(adapter->dev, "info: aborting scan\n");
  62                         cfg80211_scan_done(priv->scan_request, 1);
  63                         priv->scan_request = NULL;
  64                 } else {
  65                         priv->scan_aborting = false;
  66                         dev_dbg(adapter->dev, "info: scan already aborted\n");
  67                 }
  68                 goto done;
  69         }
  70
  71         if (!atomic_read(&priv->adapter->is_tx_received)) {
  72                 adapter->empty_tx_q_cnt++;
  73                 if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
  74                         /*
  75                          * No Tx traffic for 200msec. Get scan command from
  76                          * scan pending queue and put to cmd pending queue to
  77                          * resume scan operation
  78                          */
  79                         adapter->scan_delay_cnt = 0;
  80                         adapter->empty_tx_q_cnt = 0;
  81                         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  82                         cmd_node = list_first_entry(&adapter->scan_pending_q,
  83                                                     struct cmd_ctrl_node, list);
  84                         list_del(&cmd_node->list);
  85                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
  86                                                flags);
  87
  88                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
  89                                                         true);
  90                         queue_work(adapter->workqueue, &adapter->main_work);
  91                         goto done;
  92                 }
  93         } else {
  94                 adapter->empty_tx_q_cnt = 0;
  95         }
  96
  97         /* Delay scan operation further by 20msec */
  98         mod_timer(&priv->scan_delay_timer, jiffies +
  99                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
 100         adapter->scan_delay_cnt++;
 101
 102 done:
 103         if (atomic_read(&priv->adapter->is_tx_received))
 104                 atomic_set(&priv->adapter->is_tx_received, false);
 105
 106         return;
 107 }
 108
 109 /*
 110  * This function registers the device and performs all the necessary
 111  * initializations.
 112  *
 113  * The following initialization operations are performed -
 114  *      - Allocate adapter structure
 115  *      - Save interface specific operations table in adapter
 116  *      - Call interface specific initialization routine
 117  *      - Allocate private structures
 118  *      - Set default adapter structure parameters
 119  *      - Initialize locks
 120  *
 121  * In case of any errors during inittialization, this function also ensures
 122  * proper cleanup before exiting.
 123  */
 124 static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
 125                             void **padapter)
 126 {
 127         struct mwifiex_adapter *adapter;
 128         int i;
 129
 130         adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
 131         if (!adapter)
 132                 return -ENOMEM;
 133
 134         *padapter = adapter;
 135         adapter->card = card;
 136
 137         /* Save interface specific operations in adapter */
 138         memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
 139
 140         /* card specific initialization has been deferred until now .. */
 141         if (adapter->if_ops.init_if)
 142                 if (adapter->if_ops.init_if(adapter))
 143                         goto error;
 144
 145         adapter->priv_num = 0;
 146
 147         for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
 148                 /* Allocate memory for private structure */
 149                 adapter->priv[i] =
 150                         kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
 151                 if (!adapter->priv[i])
 152                         goto error;
 153
 154                 adapter->priv[i]->adapter = adapter;
 155                 adapter->priv_num++;
 156
 157                 setup_timer(&adapter->priv[i]->scan_delay_timer,
 158                             scan_delay_timer_fn,
 159                             (unsigned long)adapter->priv[i]);
 160         }
 161         mwifiex_init_lock_list(adapter);
 162
 163         init_timer(&adapter->cmd_timer);
 164         adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
 165         adapter->cmd_timer.data = (unsigned long) adapter;
 166
 167         return 0;
 168
 169 error:
 170         dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");
 171
 172         for (i = 0; i < adapter->priv_num; i++)
 173                 kfree(adapter->priv[i]);
 174
 175         kfree(adapter);
 176
 177         return -1;
 178 }
 179
 180 /*
 181  * This function unregisters the device and performs all the necessary
 182  * cleanups.
 183  *
 184  * The following cleanup operations are performed -
 185  *      - Free the timers
 186  *      - Free beacon buffers
 187  *      - Free private structures
 188  *      - Free adapter structure
 189  */
 190 static int mwifiex_unregister(struct mwifiex_adapter *adapter)
 191 {
 192         s32 i;
 193
 194         del_timer(&adapter->cmd_timer);
 195
 196         /* Free private structures */
 197         for (i = 0; i < adapter->priv_num; i++) {
 198                 if (adapter->priv[i]) {
 199                         mwifiex_free_curr_bcn(adapter->priv[i]);
 200                         kfree(adapter->priv[i]);
 201                 }
 202         }
 203
 204         kfree(adapter);
 205         return 0;
 206 }
 207
 208 /*
 209  * The main process.
 210  *
 211  * This function is the main procedure of the driver and handles various driver
 212  * operations. It runs in a loop and provides the core functionalities.
 213  *
 214  * The main responsibilities of this function are -
 215  *      - Ensure concurrency control
 216  *      - Handle pending interrupts and call interrupt handlers
 217  *      - Wake up the card if required
 218  *      - Handle command responses and call response handlers
 219  *      - Handle events and call event handlers
 220  *      - Execute pending commands
 221  *      - Transmit pending data packets
 222  */
 223 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 224 {
 225         int ret = 0;
 226         unsigned long flags;
 227         struct sk_buff *skb;
 228
 229         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 230
 231         /* Check if already processing */
 232         if (adapter->mwifiex_processing) {
 233                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 234                 goto exit_main_proc;
 235         } else {
 236                 adapter->mwifiex_processing = true;
 237                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 238         }
 239 process_start:
 240         do {
 241                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 242                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 243                         break;
 244
 245                 /* Handle pending interrupt if any */
 246                 if (adapter->int_status) {
 247                         if (adapter->hs_activated)
 248                                 mwifiex_process_hs_config(adapter);
 249                         if (adapter->if_ops.process_int_status)
 250                                 adapter->if_ops.process_int_status(adapter);
 251                 }
 252
 253                 /* Need to wake up the card ? */
 254                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 255                     (adapter->pm_wakeup_card_req &&
 256                      !adapter->pm_wakeup_fw_try) &&
 257                     (is_command_pending(adapter) ||
 258                      !mwifiex_wmm_lists_empty(adapter))) {
 259                         adapter->pm_wakeup_fw_try = true;
 260                         adapter->if_ops.wakeup(adapter);
 261                         continue;
 262                 }
 263
 264                 if (IS_CARD_RX_RCVD(adapter)) {
 265                         adapter->pm_wakeup_fw_try = false;
 266                         if (adapter->ps_state == PS_STATE_SLEEP)
 267                                 adapter->ps_state = PS_STATE_AWAKE;
 268                 } else {
 269                         /* We have tried to wakeup the card already */
 270                         if (adapter->pm_wakeup_fw_try)
 271                                 break;
 272                         if (adapter->ps_state != PS_STATE_AWAKE ||
 273                             adapter->tx_lock_flag)
 274                                 break;
 275
 276                         if ((adapter->scan_processing &&
 277                              !adapter->scan_delay_cnt) || adapter->data_sent ||
 278                             mwifiex_wmm_lists_empty(adapter)) {
 279                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 280                                     (!is_command_pending(adapter)))
 281                                         break;
 282                         }
 283                 }
 284
 285                 /* Check Rx data for USB */
 286                 if (adapter->iface_type == MWIFIEX_USB)
 287                         while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
 288                                 mwifiex_handle_rx_packet(adapter, skb);
 289
 290                 /* Check for Cmd Resp */
 291                 if (adapter->cmd_resp_received) {
 292                         adapter->cmd_resp_received = false;
 293                         mwifiex_process_cmdresp(adapter);
 294
 295                         /* call mwifiex back when init_fw is done */
 296                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 297                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 298                                 mwifiex_init_fw_complete(adapter);
 299                         }
 300                 }
 301
 302                 /* Check for event */
 303                 if (adapter->event_received) {
 304                         adapter->event_received = false;
 305                         mwifiex_process_event(adapter);
 306                 }
 307
 308                 /* Check if we need to confirm Sleep Request
 309                    received previously */
 310                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 311                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 312                                 mwifiex_check_ps_cond(adapter);
 313                 }
 314
 315                 /* * The ps_state may have been changed during processing of
 316                  * Sleep Request event.
 317                  */
 318                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 319                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 320                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 321                     adapter->tx_lock_flag)
 322                         continue;
 323
 324                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 325                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 326                                 ret = -1;
 327                                 break;
 328                         }
 329                 }
 330
 331                 if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
 332                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 333                         mwifiex_wmm_process_tx(adapter);
 334                         if (adapter->hs_activated) {
 335                                 adapter->is_hs_configured = false;
 336                                 mwifiex_hs_activated_event
 337                                         (mwifiex_get_priv
 338                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 339                                          false);
 340                         }
 341                 }
 342
 343                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 344                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 345                     mwifiex_wmm_lists_empty(adapter)) {
 346                         if (!mwifiex_send_null_packet
 347                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 348                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 349                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 350                                 adapter->delay_null_pkt = false;
 351                                 adapter->ps_state = PS_STATE_SLEEP;
 352                         }
 353                         break;
 354                 }
 355         } while (true);
 356
 357         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter))
 358                 goto process_start;
 359
 360         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 361         adapter->mwifiex_processing = false;
 362         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 363
 364 exit_main_proc:
 365         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 366                 mwifiex_shutdown_drv(adapter);
 367         return ret;
 368 }
 369 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 370
 371 /*
 372  * This function frees the adapter structure.
 373  *
 374  * Additionally, this closes the netlink socket, frees the timers
 375  * and private structures.
 376  */
 377 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 378 {
 379         if (!adapter) {
 380                 pr_err("%s: adapter is NULL\n", __func__);
 381                 return;
 382         }
 383
 384         mwifiex_unregister(adapter);
 385         pr_debug("info: %s: free adapter\n", __func__);
 386 }
 387
 388 /*
 389  * This function gets firmware and initializes it.
 390  *
 391  * The main initialization steps followed are -
 392  *      - Download the correct firmware to card
 393  *      - Issue the init commands to firmware
 394  */
 395 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 396 {
 397         int ret;
 398         char fmt[64];
 399         struct mwifiex_private *priv;
 400         struct mwifiex_adapter *adapter = context;
 401         struct mwifiex_fw_image fw;
 402
 403         if (!firmware) {
 404                 dev_err(adapter->dev,
 405                         "Failed to get firmware %s\n", adapter->fw_name);
 406                 goto done;
 407         }
 408
 409         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 410         adapter->firmware = firmware;
 411         fw.fw_buf = (u8 *) adapter->firmware->data;
 412         fw.fw_len = adapter->firmware->size;
 413
 414         if (adapter->if_ops.dnld_fw)
 415                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 416         else
 417                 ret = mwifiex_dnld_fw(adapter, &fw);
 418         if (ret == -1)
 419                 goto done;
 420
 421         dev_notice(adapter->dev, "WLAN FW is active\n");
 422
 423         if (cal_data_cfg) {
 424                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 425                                       adapter->dev)) < 0)
 426                         dev_err(adapter->dev,
 427                                 "Cal data request_firmware() failed\n");
 428         }
 429
 430         /* enable host interrupt after fw dnld is successful */
 431         if (adapter->if_ops.enable_int)
 432                 adapter->if_ops.enable_int(adapter);
 433
 434         adapter->init_wait_q_woken = false;
 435         ret = mwifiex_init_fw(adapter);
 436         if (ret == -1) {
 437                 goto done;
 438         } else if (!ret) {
 439                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 440                 goto done;
 441         }
 442         /* Wait for mwifiex_init to complete */
 443         wait_event_interruptible(adapter->init_wait_q,
 444                                  adapter->init_wait_q_woken);
 445         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 446                 goto done;
 447
 448         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 449         if (mwifiex_register_cfg80211(adapter)) {
 450                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 451                 goto err_init_fw;
 452         }
 453
 454         rtnl_lock();
 455         /* Create station interface by default */
 456         if (!mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 457                                       NL80211_IFTYPE_STATION, NULL, NULL)) {
 458                 dev_err(adapter->dev, "cannot create default STA interface\n");
 459                 goto err_add_intf;
 460         }
 461
 462         /* Create AP interface by default */
 463         if (!mwifiex_add_virtual_intf(adapter->wiphy, "uap%d",
 464                                       NL80211_IFTYPE_AP, NULL, NULL)) {
 465                 dev_err(adapter->dev, "cannot create default AP interface\n");
 466                 goto err_add_intf;
 467         }
 468
 469         /* Create P2P interface by default */
 470         if (!mwifiex_add_virtual_intf(adapter->wiphy, "p2p%d",
 471                                       NL80211_IFTYPE_P2P_CLIENT, NULL, NULL)) {
 472                 dev_err(adapter->dev, "cannot create default P2P interface\n");
 473                 goto err_add_intf;
 474         }
 475         rtnl_unlock();
 476
 477         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 478         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 479         goto done;
 480
 481 err_add_intf:
 482         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 483         rtnl_unlock();
 484 err_init_fw:
 485         if (adapter->if_ops.disable_int)
 486                 adapter->if_ops.disable_int(adapter);
 487         pr_debug("info: %s: unregister device\n", __func__);
 488         adapter->if_ops.unregister_dev(adapter);
 489 done:
 490         if (adapter->cal_data) {
 491                 release_firmware(adapter->cal_data);
 492                 adapter->cal_data = NULL;
 493         }
 494         release_firmware(adapter->firmware);
 495         complete(&adapter->fw_load);
 496         return;
 497 }
 498
 499 /*
 500  * This function initializes the hardware and gets firmware.
 501  */
 502 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 503 {
 504         int ret;
 505
 506         init_completion(&adapter->fw_load);
 507         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 508                                       adapter->dev, GFP_KERNEL, adapter,
 509                                       mwifiex_fw_dpc);
 510         if (ret < 0)
 511                 dev_err(adapter->dev,
 512                         "request_firmware_nowait() returned error %d\n", ret);
 513         return ret;
 514 }
 515
 516 /*
 517  * CFG802.11 network device handler for open.
 518  *
 519  * Starts the data queue.
 520  */
 521 static int
 522 mwifiex_open(struct net_device *dev)
 523 {
 524         netif_tx_start_all_queues(dev);
 525         return 0;
 526 }
 527
 528 /*
 529  * CFG802.11 network device handler for close.
 530  */
 531 static int
 532 mwifiex_close(struct net_device *dev)
 533 {
 534         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 535
 536         if (priv->scan_request) {
 537                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 538                 cfg80211_scan_done(priv->scan_request, 1);
 539                 priv->scan_request = NULL;
 540                 priv->scan_aborting = true;
 541         }
 542
 543         return 0;
 544 }
 545
 546 /*
 547  * Add buffer into wmm tx queue and queue work to transmit it.
 548  */
 549 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 550 {
 551         struct netdev_queue *txq;
 552         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 553
 554         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 555                 txq = netdev_get_tx_queue(priv->netdev, index);
 556                 if (!netif_tx_queue_stopped(txq)) {
 557                         netif_tx_stop_queue(txq);
 558                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 559                 }
 560         }
 561
 562         atomic_inc(&priv->adapter->tx_pending);
 563         mwifiex_wmm_add_buf_txqueue(priv, skb);
 564
 565         if (priv->adapter->scan_delay_cnt)
 566                 atomic_set(&priv->adapter->is_tx_received, true);
 567
 568         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 569
 570         return 0;
 571 }
 572
 573 /*
 574  * CFG802.11 network device handler for data transmission.
 575  */
 576 static int
 577 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 578 {
 579         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 580         struct sk_buff *new_skb;
 581         struct mwifiex_txinfo *tx_info;
 582         struct timeval tv;
 583
 584         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 585                 jiffies, priv->bss_type, priv->bss_num);
 586
 587         if (priv->adapter->surprise_removed) {
 588                 kfree_skb(skb);
 589                 priv->stats.tx_dropped++;
 590                 return 0;
 591         }
 592         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 593                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 594                 kfree_skb(skb);
 595                 priv->stats.tx_dropped++;
 596                 return 0;
 597         }
 598         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 599                 dev_dbg(priv->adapter->dev,
 600                         "data: Tx: insufficient skb headroom %d\n",
 601                         skb_headroom(skb));
 602                 /* Insufficient skb headroom - allocate a new skb */
 603                 new_skb =
 604                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 605                 if (unlikely(!new_skb)) {
 606                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 607                         kfree_skb(skb);
 608                         priv->stats.tx_dropped++;
 609                         return 0;
 610                 }
 611                 kfree_skb(skb);
 612                 skb = new_skb;
 613                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 614                         skb_headroom(skb));
 615         }
 616
 617         tx_info = MWIFIEX_SKB_TXCB(skb);
 618         tx_info->bss_num = priv->bss_num;
 619         tx_info->bss_type = priv->bss_type;
 620
 621         /* Record the current time the packet was queued; used to
 622          * determine the amount of time the packet was queued in
 623          * the driver before it was sent to the firmware.
 624          * The delay is then sent along with the packet to the
 625          * firmware for aggregate delay calculation for stats and
 626          * MSDU lifetime expiry.
 627          */
 628         do_gettimeofday(&tv);
 629         skb->tstamp = timeval_to_ktime(tv);
 630
 631         mwifiex_queue_tx_pkt(priv, skb);
 632
 633         return 0;
 634 }
 635
 636 /*
 637  * CFG802.11 network device handler for setting MAC address.
 638  */
 639 static int
 640 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 641 {
 642         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 643         struct sockaddr *hw_addr = addr;
 644         int ret;
 645
 646         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 647
 648         /* Send request to firmware */
 649         ret = mwifiex_send_cmd_sync(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 650                                     HostCmd_ACT_GEN_SET, 0, NULL);
 651
 652         if (!ret)
 653                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 654         else
 655                 dev_err(priv->adapter->dev,
 656                         "set mac address failed: ret=%d\n", ret);
 657
 658         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 659
 660         return ret;
 661 }
 662
 663 /*
 664  * CFG802.11 network device handler for setting multicast list.
 665  */
 666 static void mwifiex_set_multicast_list(struct net_device *dev)
 667 {
 668         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 669         struct mwifiex_multicast_list mcast_list;
 670
 671         if (dev->flags & IFF_PROMISC) {
 672                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 673         } else if (dev->flags & IFF_ALLMULTI ||
 674                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 675                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 676         } else {
 677                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 678                 mcast_list.num_multicast_addr =
 679                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 680         }
 681         mwifiex_request_set_multicast_list(priv, &mcast_list);
 682 }
 683
 684 /*
 685  * CFG802.11 network device handler for transmission timeout.
 686  */
 687 static void
 688 mwifiex_tx_timeout(struct net_device *dev)
 689 {
 690         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 691
 692         priv->num_tx_timeout++;
 693         priv->tx_timeout_cnt++;
 694         dev_err(priv->adapter->dev,
 695                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 696                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 697         mwifiex_set_trans_start(dev);
 698
 699         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 700             priv->adapter->if_ops.card_reset) {
 701                 dev_err(priv->adapter->dev,
 702                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 703                 priv->adapter->if_ops.card_reset(priv->adapter);
 704         }
 705 }
 706
 707 /*
 708  * CFG802.11 network device handler for statistics retrieval.
 709  */
 710 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 711 {
 712         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 713
 714         return &priv->stats;
 715 }
 716
 717 static u16
 718 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb)
 719 {
 720         skb->priority = cfg80211_classify8021d(skb);
 721         return mwifiex_1d_to_wmm_queue[skb->priority];
 722 }
 723
 724 /* Network device handlers */
 725 static const struct net_device_ops mwifiex_netdev_ops = {
 726         .ndo_open = mwifiex_open,
 727         .ndo_stop = mwifiex_close,
 728         .ndo_start_xmit = mwifiex_hard_start_xmit,
 729         .ndo_set_mac_address = mwifiex_set_mac_address,
 730         .ndo_tx_timeout = mwifiex_tx_timeout,
 731         .ndo_get_stats = mwifiex_get_stats,
 732         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 733         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 734 };
 735
 736 /*
 737  * This function initializes the private structure parameters.
 738  *
 739  * The following wait queues are initialized -
 740  *      - IOCTL wait queue
 741  *      - Command wait queue
 742  *      - Statistics wait queue
 743  *
 744  * ...and the following default parameters are set -
 745  *      - Current key index     : Set to 0
 746  *      - Rate index            : Set to auto
 747  *      - Media connected       : Set to disconnected
 748  *      - Adhoc link sensed     : Set to false
 749  *      - Nick name             : Set to null
 750  *      - Number of Tx timeout  : Set to 0
 751  *      - Device address        : Set to current address
 752  *
 753  * In addition, the CFG80211 work queue is also created.
 754  */
 755 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 756                                                 struct net_device *dev)
 757 {
 758         dev->netdev_ops = &mwifiex_netdev_ops;
 759         dev->destructor = free_netdev;
 760         /* Initialize private structure */
 761         priv->current_key_index = 0;
 762         priv->media_connected = false;
 763         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 764         memset(priv->mgmt_ie, 0,
 765                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 766         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 767         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 768         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 769         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 770         priv->num_tx_timeout = 0;
 771         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 772 }
 773
 774 /*
 775  * This function check if command is pending.
 776  */
 777 int is_command_pending(struct mwifiex_adapter *adapter)
 778 {
 779         unsigned long flags;
 780         int is_cmd_pend_q_empty;
 781
 782         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 783         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 784         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 785
 786         return !is_cmd_pend_q_empty;
 787 }
 788
 789 /*
 790  * This is the main work queue function.
 791  *
 792  * It handles the main process, which in turn handles the complete
 793  * driver operations.
 794  */
 795 static void mwifiex_main_work_queue(struct work_struct *work)
 796 {
 797         struct mwifiex_adapter *adapter =
 798                 container_of(work, struct mwifiex_adapter, main_work);
 799
 800         if (adapter->surprise_removed)
 801                 return;
 802         mwifiex_main_process(adapter);
 803 }
 804
 805 /*
 806  * This function cancels all works in the queue and destroys
 807  * the main workqueue.
 808  */
 809 static void
 810 mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 811 {
 812         flush_workqueue(adapter->workqueue);
 813         destroy_workqueue(adapter->workqueue);
 814         adapter->workqueue = NULL;
 815 }
 816
 817 /*
 818  * This function adds the card.
 819  *
 820  * This function follows the following major steps to set up the device -
 821  *      - Initialize software. This includes probing the card, registering
 822  *        the interface operations table, and allocating/initializing the
 823  *        adapter structure
 824  *      - Set up the netlink socket
 825  *      - Create and start the main work queue
 826  *      - Register the device
 827  *      - Initialize firmware and hardware
 828  *      - Add logical interfaces
 829  */
 830 int
 831 mwifiex_add_card(void *card, struct semaphore *sem,
 832                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 833 {
 834         struct mwifiex_adapter *adapter;
 835
 836         if (down_interruptible(sem))
 837                 goto exit_sem_err;
 838
 839         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 840                 pr_err("%s: software init failed\n", __func__);
 841                 goto err_init_sw;
 842         }
 843
 844         adapter->iface_type = iface_type;
 845
 846         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 847         adapter->surprise_removed = false;
 848         init_waitqueue_head(&adapter->init_wait_q);
 849         adapter->is_suspended = false;
 850         adapter->hs_activated = false;
 851         init_waitqueue_head(&adapter->hs_activate_wait_q);
 852         adapter->cmd_wait_q_required = false;
 853         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 854         adapter->cmd_wait_q.status = 0;
 855         adapter->scan_wait_q_woken = false;
 856
 857         adapter->workqueue = create_workqueue("MWIFIEX_WORK_QUEUE");
 858         if (!adapter->workqueue)
 859                 goto err_kmalloc;
 860
 861         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 862
 863         /* Register the device. Fill up the private data structure with relevant
 864            information from the card. */
 865         if (adapter->if_ops.register_dev(adapter)) {
 866                 pr_err("%s: failed to register mwifiex device\n", __func__);
 867                 goto err_registerdev;
 868         }
 869
 870         if (mwifiex_init_hw_fw(adapter)) {
 871                 pr_err("%s: firmware init failed\n", __func__);
 872                 goto err_init_fw;
 873         }
 874
 875         up(sem);
 876         return 0;
 877
 878 err_init_fw:
 879         pr_debug("info: %s: unregister device\n", __func__);
 880         if (adapter->if_ops.unregister_dev)
 881                 adapter->if_ops.unregister_dev(adapter);
 882 err_registerdev:
 883         adapter->surprise_removed = true;
 884         mwifiex_terminate_workqueue(adapter);
 885 err_kmalloc:
 886         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 887             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 888                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 889                 adapter->init_wait_q_woken = false;
 890
 891                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 892                         wait_event_interruptible(adapter->init_wait_q,
 893                                                  adapter->init_wait_q_woken);
 894         }
 895
 896         mwifiex_free_adapter(adapter);
 897
 898 err_init_sw:
 899         up(sem);
 900
 901 exit_sem_err:
 902         return -1;
 903 }
 904 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 905
 906 /*
 907  * This function removes the card.
 908  *
 909  * This function follows the following major steps to remove the device -
 910  *      - Stop data traffic
 911  *      - Shutdown firmware
 912  *      - Remove the logical interfaces
 913  *      - Terminate the work queue
 914  *      - Unregister the device
 915  *      - Free the adapter structure
 916  */
 917 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 918 {
 919         struct mwifiex_private *priv = NULL;
 920         int i;
 921
 922         if (down_interruptible(sem))
 923                 goto exit_sem_err;
 924
 925         if (!adapter)
 926                 goto exit_remove;
 927
 928         /* We can no longer handle interrupts once we start doing the teardown
 929          * below. */
 930         if (adapter->if_ops.disable_int)
 931                 adapter->if_ops.disable_int(adapter);
 932
 933         adapter->surprise_removed = true;
 934
 935         /* Stop data */
 936         for (i = 0; i < adapter->priv_num; i++) {
 937                 priv = adapter->priv[i];
 938                 if (priv && priv->netdev) {
 939                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 940                         if (netif_carrier_ok(priv->netdev))
 941                                 netif_carrier_off(priv->netdev);
 942                 }
 943         }
 944
 945         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 946         adapter->init_wait_q_woken = false;
 947
 948         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 949                 wait_event_interruptible(adapter->init_wait_q,
 950                                          adapter->init_wait_q_woken);
 951         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 952         if (atomic_read(&adapter->rx_pending) ||
 953             atomic_read(&adapter->tx_pending) ||
 954             atomic_read(&adapter->cmd_pending)) {
 955                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 956                        "cmd_pending=%d\n",
 957                        atomic_read(&adapter->rx_pending),
 958                        atomic_read(&adapter->tx_pending),
 959                        atomic_read(&adapter->cmd_pending));
 960         }
 961
 962         for (i = 0; i < adapter->priv_num; i++) {
 963                 priv = adapter->priv[i];
 964
 965                 if (!priv)
 966                         continue;
 967
 968                 rtnl_lock();
 969                 if (priv->wdev && priv->netdev)
 970                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 971                 rtnl_unlock();
 972         }
 973
 974         priv = adapter->priv[0];
 975         if (!priv || !priv->wdev)
 976                 goto exit_remove;
 977
 978         wiphy_unregister(priv->wdev->wiphy);
 979         wiphy_free(priv->wdev->wiphy);
 980
 981         for (i = 0; i < adapter->priv_num; i++) {
 982                 priv = adapter->priv[i];
 983                 if (priv)
 984                         kfree(priv->wdev);
 985         }
 986
 987         mwifiex_terminate_workqueue(adapter);
 988
 989         /* Unregister device */
 990         dev_dbg(adapter->dev, "info: unregister device\n");
 991         if (adapter->if_ops.unregister_dev)
 992                 adapter->if_ops.unregister_dev(adapter);
 993         /* Free adapter structure */
 994         dev_dbg(adapter->dev, "info: free adapter\n");
 995         mwifiex_free_adapter(adapter);
 996
 997 exit_remove:
 998         up(sem);
 999 exit_sem_err:
1000         return 0;
1001 }
1002 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1003
1004 /*
1005  * This function initializes the module.
1006  *
1007  * The debug FS is also initialized if configured.
1008  */
1009 static int
1010 mwifiex_init_module(void)
1011 {
1012 #ifdef CONFIG_DEBUG_FS
1013         mwifiex_debugfs_init();
1014 #endif
1015         return 0;
1016 }
1017
1018 /*
1019  * This function cleans up the module.
1020  *
1021  * The debug FS is removed if available.
1022  */
1023 static void
1024 mwifiex_cleanup_module(void)
1025 {
1026 #ifdef CONFIG_DEBUG_FS
1027         mwifiex_debugfs_remove();
1028 #endif
1029 }
1030
1031 module_init(mwifiex_init_module);
1032 module_exit(mwifiex_cleanup_module);
1033
1034 MODULE_AUTHOR("Marvell International Ltd.");
1035 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1036 MODULE_VERSION(VERSION);
1037 MODULE_LICENSE("GPL v2");