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         if (adapter->if_ops.cleanup_if)
 195                 adapter->if_ops.cleanup_if(adapter);
 196
 197         del_timer(&adapter->cmd_timer);
 198
 199         /* Free private structures */
 200         for (i = 0; i < adapter->priv_num; i++) {
 201                 if (adapter->priv[i]) {
 202                         mwifiex_free_curr_bcn(adapter->priv[i]);
 203                         del_timer_sync(&adapter->priv[i]->scan_delay_timer);
 204                         kfree(adapter->priv[i]);
 205                 }
 206         }
 207
 208         kfree(adapter);
 209         return 0;
 210 }
 211
 212 /*
 213  * The main process.
 214  *
 215  * This function is the main procedure of the driver and handles various driver
 216  * operations. It runs in a loop and provides the core functionalities.
 217  *
 218  * The main responsibilities of this function are -
 219  *      - Ensure concurrency control
 220  *      - Handle pending interrupts and call interrupt handlers
 221  *      - Wake up the card if required
 222  *      - Handle command responses and call response handlers
 223  *      - Handle events and call event handlers
 224  *      - Execute pending commands
 225  *      - Transmit pending data packets
 226  */
 227 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 228 {
 229         int ret = 0;
 230         unsigned long flags;
 231         struct sk_buff *skb;
 232
 233         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 234
 235         /* Check if already processing */
 236         if (adapter->mwifiex_processing) {
 237                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 238                 goto exit_main_proc;
 239         } else {
 240                 adapter->mwifiex_processing = true;
 241                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 242         }
 243 process_start:
 244         do {
 245                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 246                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 247                         break;
 248
 249                 /* Handle pending interrupt if any */
 250                 if (adapter->int_status) {
 251                         if (adapter->hs_activated)
 252                                 mwifiex_process_hs_config(adapter);
 253                         if (adapter->if_ops.process_int_status)
 254                                 adapter->if_ops.process_int_status(adapter);
 255                 }
 256
 257                 /* Need to wake up the card ? */
 258                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 259                     (adapter->pm_wakeup_card_req &&
 260                      !adapter->pm_wakeup_fw_try) &&
 261                     (is_command_pending(adapter) ||
 262                      !mwifiex_wmm_lists_empty(adapter))) {
 263                         adapter->pm_wakeup_fw_try = true;
 264                         adapter->if_ops.wakeup(adapter);
 265                         continue;
 266                 }
 267
 268                 if (IS_CARD_RX_RCVD(adapter)) {
 269                         adapter->pm_wakeup_fw_try = false;
 270                         if (adapter->ps_state == PS_STATE_SLEEP)
 271                                 adapter->ps_state = PS_STATE_AWAKE;
 272                 } else {
 273                         /* We have tried to wakeup the card already */
 274                         if (adapter->pm_wakeup_fw_try)
 275                                 break;
 276                         if (adapter->ps_state != PS_STATE_AWAKE ||
 277                             adapter->tx_lock_flag)
 278                                 break;
 279
 280                         if ((adapter->scan_processing &&
 281                              !adapter->scan_delay_cnt) || adapter->data_sent ||
 282                             mwifiex_wmm_lists_empty(adapter)) {
 283                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 284                                     (!is_command_pending(adapter)))
 285                                         break;
 286                         }
 287                 }
 288
 289                 /* Check Rx data for USB */
 290                 if (adapter->iface_type == MWIFIEX_USB)
 291                         while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
 292                                 mwifiex_handle_rx_packet(adapter, skb);
 293
 294                 /* Check for Cmd Resp */
 295                 if (adapter->cmd_resp_received) {
 296                         adapter->cmd_resp_received = false;
 297                         mwifiex_process_cmdresp(adapter);
 298
 299                         /* call mwifiex back when init_fw is done */
 300                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 301                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 302                                 mwifiex_init_fw_complete(adapter);
 303                         }
 304                 }
 305
 306                 /* Check for event */
 307                 if (adapter->event_received) {
 308                         adapter->event_received = false;
 309                         mwifiex_process_event(adapter);
 310                 }
 311
 312                 /* Check if we need to confirm Sleep Request
 313                    received previously */
 314                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 315                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 316                                 mwifiex_check_ps_cond(adapter);
 317                 }
 318
 319                 /* * The ps_state may have been changed during processing of
 320                  * Sleep Request event.
 321                  */
 322                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 323                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 324                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 325                     adapter->tx_lock_flag)
 326                         continue;
 327
 328                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 329                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 330                                 ret = -1;
 331                                 break;
 332                         }
 333                 }
 334
 335                 if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
 336                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 337                         mwifiex_wmm_process_tx(adapter);
 338                         if (adapter->hs_activated) {
 339                                 adapter->is_hs_configured = false;
 340                                 mwifiex_hs_activated_event
 341                                         (mwifiex_get_priv
 342                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 343                                          false);
 344                         }
 345                 }
 346
 347                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 348                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 349                     mwifiex_wmm_lists_empty(adapter)) {
 350                         if (!mwifiex_send_null_packet
 351                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 352                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 353                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 354                                 adapter->delay_null_pkt = false;
 355                                 adapter->ps_state = PS_STATE_SLEEP;
 356                         }
 357                         break;
 358                 }
 359         } while (true);
 360
 361         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter))
 362                 goto process_start;
 363
 364         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 365         adapter->mwifiex_processing = false;
 366         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 367
 368 exit_main_proc:
 369         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 370                 mwifiex_shutdown_drv(adapter);
 371         return ret;
 372 }
 373 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 374
 375 /*
 376  * This function frees the adapter structure.
 377  *
 378  * Additionally, this closes the netlink socket, frees the timers
 379  * and private structures.
 380  */
 381 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 382 {
 383         if (!adapter) {
 384                 pr_err("%s: adapter is NULL\n", __func__);
 385                 return;
 386         }
 387
 388         mwifiex_unregister(adapter);
 389         pr_debug("info: %s: free adapter\n", __func__);
 390 }
 391
 392 /*
 393  * This function cancels all works in the queue and destroys
 394  * the main workqueue.
 395  */
 396 static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 397 {
 398         flush_workqueue(adapter->workqueue);
 399         destroy_workqueue(adapter->workqueue);
 400         adapter->workqueue = NULL;
 401 }
 402
 403 /*
 404  * This function gets firmware and initializes it.
 405  *
 406  * The main initialization steps followed are -
 407  *      - Download the correct firmware to card
 408  *      - Issue the init commands to firmware
 409  */
 410 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 411 {
 412         int ret, i;
 413         char fmt[64];
 414         struct mwifiex_private *priv;
 415         struct mwifiex_adapter *adapter = context;
 416         struct mwifiex_fw_image fw;
 417         struct semaphore *sem = adapter->card_sem;
 418         bool init_failed = false;
 419
 420         if (!firmware) {
 421                 dev_err(adapter->dev,
 422                         "Failed to get firmware %s\n", adapter->fw_name);
 423                 goto err_dnld_fw;
 424         }
 425
 426         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 427         adapter->firmware = firmware;
 428         fw.fw_buf = (u8 *) adapter->firmware->data;
 429         fw.fw_len = adapter->firmware->size;
 430
 431         if (adapter->if_ops.dnld_fw)
 432                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 433         else
 434                 ret = mwifiex_dnld_fw(adapter, &fw);
 435         if (ret == -1)
 436                 goto err_dnld_fw;
 437
 438         dev_notice(adapter->dev, "WLAN FW is active\n");
 439
 440         if (cal_data_cfg) {
 441                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 442                                       adapter->dev)) < 0)
 443                         dev_err(adapter->dev,
 444                                 "Cal data request_firmware() failed\n");
 445         }
 446
 447         /* enable host interrupt after fw dnld is successful */
 448         if (adapter->if_ops.enable_int) {
 449                 if (adapter->if_ops.enable_int(adapter))
 450                         goto err_dnld_fw;
 451         }
 452
 453         adapter->init_wait_q_woken = false;
 454         ret = mwifiex_init_fw(adapter);
 455         if (ret == -1) {
 456                 goto err_init_fw;
 457         } else if (!ret) {
 458                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 459                 goto done;
 460         }
 461         /* Wait for mwifiex_init to complete */
 462         wait_event_interruptible(adapter->init_wait_q,
 463                                  adapter->init_wait_q_woken);
 464         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 465                 goto err_init_fw;
 466
 467         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 468         if (mwifiex_register_cfg80211(adapter)) {
 469                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 470                 goto err_register_cfg80211;
 471         }
 472
 473         rtnl_lock();
 474         /* Create station interface by default */
 475         if (!mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 476                                       NL80211_IFTYPE_STATION, NULL, NULL)) {
 477                 dev_err(adapter->dev, "cannot create default STA interface\n");
 478                 goto err_add_intf;
 479         }
 480         rtnl_unlock();
 481
 482         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 483         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 484         goto done;
 485
 486 err_add_intf:
 487         for (i = 0; i < adapter->priv_num; i++) {
 488                 priv = adapter->priv[i];
 489
 490                 if (!priv)
 491                         continue;
 492
 493                 if (priv->wdev && priv->netdev)
 494                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 495         }
 496         rtnl_unlock();
 497 err_register_cfg80211:
 498         wiphy_unregister(adapter->wiphy);
 499         wiphy_free(adapter->wiphy);
 500 err_init_fw:
 501         if (adapter->if_ops.disable_int)
 502                 adapter->if_ops.disable_int(adapter);
 503 err_dnld_fw:
 504         pr_debug("info: %s: unregister device\n", __func__);
 505         if (adapter->if_ops.unregister_dev)
 506                 adapter->if_ops.unregister_dev(adapter);
 507
 508         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 509             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 510                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 511                 adapter->init_wait_q_woken = false;
 512
 513                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 514                         wait_event_interruptible(adapter->init_wait_q,
 515                                                  adapter->init_wait_q_woken);
 516         }
 517         adapter->surprise_removed = true;
 518         mwifiex_terminate_workqueue(adapter);
 519         init_failed = true;
 520 done:
 521         if (adapter->cal_data) {
 522                 release_firmware(adapter->cal_data);
 523                 adapter->cal_data = NULL;
 524         }
 525         if (adapter->firmware) {
 526                 release_firmware(adapter->firmware);
 527                 adapter->firmware = NULL;
 528         }
 529         complete(&adapter->fw_load);
 530         if (init_failed)
 531                 mwifiex_free_adapter(adapter);
 532         up(sem);
 533         return;
 534 }
 535
 536 /*
 537  * This function initializes the hardware and gets firmware.
 538  */
 539 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 540 {
 541         int ret;
 542
 543         init_completion(&adapter->fw_load);
 544         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 545                                       adapter->dev, GFP_KERNEL, adapter,
 546                                       mwifiex_fw_dpc);
 547         if (ret < 0)
 548                 dev_err(adapter->dev,
 549                         "request_firmware_nowait() returned error %d\n", ret);
 550         return ret;
 551 }
 552
 553 /*
 554  * CFG802.11 network device handler for open.
 555  *
 556  * Starts the data queue.
 557  */
 558 static int
 559 mwifiex_open(struct net_device *dev)
 560 {
 561         netif_tx_start_all_queues(dev);
 562         return 0;
 563 }
 564
 565 /*
 566  * CFG802.11 network device handler for close.
 567  */
 568 static int
 569 mwifiex_close(struct net_device *dev)
 570 {
 571         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 572
 573         if (priv->scan_request) {
 574                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 575                 cfg80211_scan_done(priv->scan_request, 1);
 576                 priv->scan_request = NULL;
 577                 priv->scan_aborting = true;
 578         }
 579
 580         return 0;
 581 }
 582
 583 /*
 584  * Add buffer into wmm tx queue and queue work to transmit it.
 585  */
 586 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 587 {
 588         struct netdev_queue *txq;
 589         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 590
 591         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 592                 txq = netdev_get_tx_queue(priv->netdev, index);
 593                 if (!netif_tx_queue_stopped(txq)) {
 594                         netif_tx_stop_queue(txq);
 595                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 596                 }
 597         }
 598
 599         atomic_inc(&priv->adapter->tx_pending);
 600         mwifiex_wmm_add_buf_txqueue(priv, skb);
 601
 602         if (priv->adapter->scan_delay_cnt)
 603                 atomic_set(&priv->adapter->is_tx_received, true);
 604
 605         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 606
 607         return 0;
 608 }
 609
 610 /*
 611  * CFG802.11 network device handler for data transmission.
 612  */
 613 static int
 614 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 615 {
 616         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 617         struct sk_buff *new_skb;
 618         struct mwifiex_txinfo *tx_info;
 619         struct timeval tv;
 620
 621         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 622                 jiffies, priv->bss_type, priv->bss_num);
 623
 624         if (priv->adapter->surprise_removed) {
 625                 kfree_skb(skb);
 626                 priv->stats.tx_dropped++;
 627                 return 0;
 628         }
 629         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 630                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 631                 kfree_skb(skb);
 632                 priv->stats.tx_dropped++;
 633                 return 0;
 634         }
 635         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 636                 dev_dbg(priv->adapter->dev,
 637                         "data: Tx: insufficient skb headroom %d\n",
 638                         skb_headroom(skb));
 639                 /* Insufficient skb headroom - allocate a new skb */
 640                 new_skb =
 641                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 642                 if (unlikely(!new_skb)) {
 643                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 644                         kfree_skb(skb);
 645                         priv->stats.tx_dropped++;
 646                         return 0;
 647                 }
 648                 kfree_skb(skb);
 649                 skb = new_skb;
 650                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 651                         skb_headroom(skb));
 652         }
 653
 654         tx_info = MWIFIEX_SKB_TXCB(skb);
 655         tx_info->bss_num = priv->bss_num;
 656         tx_info->bss_type = priv->bss_type;
 657
 658         /* Record the current time the packet was queued; used to
 659          * determine the amount of time the packet was queued in
 660          * the driver before it was sent to the firmware.
 661          * The delay is then sent along with the packet to the
 662          * firmware for aggregate delay calculation for stats and
 663          * MSDU lifetime expiry.
 664          */
 665         do_gettimeofday(&tv);
 666         skb->tstamp = timeval_to_ktime(tv);
 667
 668         mwifiex_queue_tx_pkt(priv, skb);
 669
 670         return 0;
 671 }
 672
 673 /*
 674  * CFG802.11 network device handler for setting MAC address.
 675  */
 676 static int
 677 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 678 {
 679         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 680         struct sockaddr *hw_addr = addr;
 681         int ret;
 682
 683         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 684
 685         /* Send request to firmware */
 686         ret = mwifiex_send_cmd_sync(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 687                                     HostCmd_ACT_GEN_SET, 0, NULL);
 688
 689         if (!ret)
 690                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 691         else
 692                 dev_err(priv->adapter->dev,
 693                         "set mac address failed: ret=%d\n", ret);
 694
 695         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 696
 697         return ret;
 698 }
 699
 700 /*
 701  * CFG802.11 network device handler for setting multicast list.
 702  */
 703 static void mwifiex_set_multicast_list(struct net_device *dev)
 704 {
 705         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 706         struct mwifiex_multicast_list mcast_list;
 707
 708         if (dev->flags & IFF_PROMISC) {
 709                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 710         } else if (dev->flags & IFF_ALLMULTI ||
 711                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 712                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 713         } else {
 714                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 715                 mcast_list.num_multicast_addr =
 716                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 717         }
 718         mwifiex_request_set_multicast_list(priv, &mcast_list);
 719 }
 720
 721 /*
 722  * CFG802.11 network device handler for transmission timeout.
 723  */
 724 static void
 725 mwifiex_tx_timeout(struct net_device *dev)
 726 {
 727         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 728
 729         priv->num_tx_timeout++;
 730         priv->tx_timeout_cnt++;
 731         dev_err(priv->adapter->dev,
 732                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 733                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 734         mwifiex_set_trans_start(dev);
 735
 736         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 737             priv->adapter->if_ops.card_reset) {
 738                 dev_err(priv->adapter->dev,
 739                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 740                 priv->adapter->if_ops.card_reset(priv->adapter);
 741         }
 742 }
 743
 744 /*
 745  * CFG802.11 network device handler for statistics retrieval.
 746  */
 747 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 748 {
 749         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 750
 751         return &priv->stats;
 752 }
 753
 754 static u16
 755 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb)
 756 {
 757         skb->priority = cfg80211_classify8021d(skb);
 758         return mwifiex_1d_to_wmm_queue[skb->priority];
 759 }
 760
 761 /* Network device handlers */
 762 static const struct net_device_ops mwifiex_netdev_ops = {
 763         .ndo_open = mwifiex_open,
 764         .ndo_stop = mwifiex_close,
 765         .ndo_start_xmit = mwifiex_hard_start_xmit,
 766         .ndo_set_mac_address = mwifiex_set_mac_address,
 767         .ndo_tx_timeout = mwifiex_tx_timeout,
 768         .ndo_get_stats = mwifiex_get_stats,
 769         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 770         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 771 };
 772
 773 /*
 774  * This function initializes the private structure parameters.
 775  *
 776  * The following wait queues are initialized -
 777  *      - IOCTL wait queue
 778  *      - Command wait queue
 779  *      - Statistics wait queue
 780  *
 781  * ...and the following default parameters are set -
 782  *      - Current key index     : Set to 0
 783  *      - Rate index            : Set to auto
 784  *      - Media connected       : Set to disconnected
 785  *      - Adhoc link sensed     : Set to false
 786  *      - Nick name             : Set to null
 787  *      - Number of Tx timeout  : Set to 0
 788  *      - Device address        : Set to current address
 789  *
 790  * In addition, the CFG80211 work queue is also created.
 791  */
 792 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 793                                                 struct net_device *dev)
 794 {
 795         dev->netdev_ops = &mwifiex_netdev_ops;
 796         dev->destructor = free_netdev;
 797         /* Initialize private structure */
 798         priv->current_key_index = 0;
 799         priv->media_connected = false;
 800         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 801         memset(priv->mgmt_ie, 0,
 802                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 803         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 804         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 805         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 806         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 807         priv->num_tx_timeout = 0;
 808         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 809 }
 810
 811 /*
 812  * This function check if command is pending.
 813  */
 814 int is_command_pending(struct mwifiex_adapter *adapter)
 815 {
 816         unsigned long flags;
 817         int is_cmd_pend_q_empty;
 818
 819         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 820         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 821         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 822
 823         return !is_cmd_pend_q_empty;
 824 }
 825
 826 /*
 827  * This is the main work queue function.
 828  *
 829  * It handles the main process, which in turn handles the complete
 830  * driver operations.
 831  */
 832 static void mwifiex_main_work_queue(struct work_struct *work)
 833 {
 834         struct mwifiex_adapter *adapter =
 835                 container_of(work, struct mwifiex_adapter, main_work);
 836
 837         if (adapter->surprise_removed)
 838                 return;
 839         mwifiex_main_process(adapter);
 840 }
 841
 842 /*
 843  * This function adds the card.
 844  *
 845  * This function follows the following major steps to set up the device -
 846  *      - Initialize software. This includes probing the card, registering
 847  *        the interface operations table, and allocating/initializing the
 848  *        adapter structure
 849  *      - Set up the netlink socket
 850  *      - Create and start the main work queue
 851  *      - Register the device
 852  *      - Initialize firmware and hardware
 853  *      - Add logical interfaces
 854  */
 855 int
 856 mwifiex_add_card(void *card, struct semaphore *sem,
 857                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 858 {
 859         struct mwifiex_adapter *adapter;
 860
 861         if (down_interruptible(sem))
 862                 goto exit_sem_err;
 863
 864         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 865                 pr_err("%s: software init failed\n", __func__);
 866                 goto err_init_sw;
 867         }
 868
 869         adapter->iface_type = iface_type;
 870         adapter->card_sem = sem;
 871
 872         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 873         adapter->surprise_removed = false;
 874         init_waitqueue_head(&adapter->init_wait_q);
 875         adapter->is_suspended = false;
 876         adapter->hs_activated = false;
 877         init_waitqueue_head(&adapter->hs_activate_wait_q);
 878         adapter->cmd_wait_q_required = false;
 879         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 880         adapter->cmd_wait_q.status = 0;
 881         adapter->scan_wait_q_woken = false;
 882
 883         adapter->workqueue = create_workqueue("MWIFIEX_WORK_QUEUE");
 884         if (!adapter->workqueue)
 885                 goto err_kmalloc;
 886
 887         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 888
 889         /* Register the device. Fill up the private data structure with relevant
 890            information from the card. */
 891         if (adapter->if_ops.register_dev(adapter)) {
 892                 pr_err("%s: failed to register mwifiex device\n", __func__);
 893                 goto err_registerdev;
 894         }
 895
 896         if (mwifiex_init_hw_fw(adapter)) {
 897                 pr_err("%s: firmware init failed\n", __func__);
 898                 goto err_init_fw;
 899         }
 900
 901         return 0;
 902
 903 err_init_fw:
 904         pr_debug("info: %s: unregister device\n", __func__);
 905         if (adapter->if_ops.unregister_dev)
 906                 adapter->if_ops.unregister_dev(adapter);
 907         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 908             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 909                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 910                 adapter->init_wait_q_woken = false;
 911
 912                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 913                         wait_event_interruptible(adapter->init_wait_q,
 914                                                  adapter->init_wait_q_woken);
 915         }
 916 err_registerdev:
 917         adapter->surprise_removed = true;
 918         mwifiex_terminate_workqueue(adapter);
 919 err_kmalloc:
 920         mwifiex_free_adapter(adapter);
 921
 922 err_init_sw:
 923         up(sem);
 924
 925 exit_sem_err:
 926         return -1;
 927 }
 928 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 929
 930 /*
 931  * This function removes the card.
 932  *
 933  * This function follows the following major steps to remove the device -
 934  *      - Stop data traffic
 935  *      - Shutdown firmware
 936  *      - Remove the logical interfaces
 937  *      - Terminate the work queue
 938  *      - Unregister the device
 939  *      - Free the adapter structure
 940  */
 941 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 942 {
 943         struct mwifiex_private *priv = NULL;
 944         int i;
 945
 946         if (down_interruptible(sem))
 947                 goto exit_sem_err;
 948
 949         if (!adapter)
 950                 goto exit_remove;
 951
 952         /* We can no longer handle interrupts once we start doing the teardown
 953          * below. */
 954         if (adapter->if_ops.disable_int)
 955                 adapter->if_ops.disable_int(adapter);
 956
 957         adapter->surprise_removed = true;
 958
 959         /* Stop data */
 960         for (i = 0; i < adapter->priv_num; i++) {
 961                 priv = adapter->priv[i];
 962                 if (priv && priv->netdev) {
 963                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 964                         if (netif_carrier_ok(priv->netdev))
 965                                 netif_carrier_off(priv->netdev);
 966                 }
 967         }
 968
 969         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 970         adapter->init_wait_q_woken = false;
 971
 972         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 973                 wait_event_interruptible(adapter->init_wait_q,
 974                                          adapter->init_wait_q_woken);
 975         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 976         if (atomic_read(&adapter->rx_pending) ||
 977             atomic_read(&adapter->tx_pending) ||
 978             atomic_read(&adapter->cmd_pending)) {
 979                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 980                        "cmd_pending=%d\n",
 981                        atomic_read(&adapter->rx_pending),
 982                        atomic_read(&adapter->tx_pending),
 983                        atomic_read(&adapter->cmd_pending));
 984         }
 985
 986         for (i = 0; i < adapter->priv_num; i++) {
 987                 priv = adapter->priv[i];
 988
 989                 if (!priv)
 990                         continue;
 991
 992                 rtnl_lock();
 993                 if (priv->wdev && priv->netdev)
 994                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 995                 rtnl_unlock();
 996         }
 997
 998         priv = adapter->priv[0];
 999         if (!priv || !priv->wdev)
1000                 goto exit_remove;
1001
1002         wiphy_unregister(priv->wdev->wiphy);
1003         wiphy_free(priv->wdev->wiphy);
1004
1005         for (i = 0; i < adapter->priv_num; i++) {
1006                 priv = adapter->priv[i];
1007                 if (priv)
1008                         kfree(priv->wdev);
1009         }
1010
1011         mwifiex_terminate_workqueue(adapter);
1012
1013         /* Unregister device */
1014         dev_dbg(adapter->dev, "info: unregister device\n");
1015         if (adapter->if_ops.unregister_dev)
1016                 adapter->if_ops.unregister_dev(adapter);
1017         /* Free adapter structure */
1018         dev_dbg(adapter->dev, "info: free adapter\n");
1019         mwifiex_free_adapter(adapter);
1020
1021 exit_remove:
1022         up(sem);
1023 exit_sem_err:
1024         return 0;
1025 }
1026 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1027
1028 /*
1029  * This function initializes the module.
1030  *
1031  * The debug FS is also initialized if configured.
1032  */
1033 static int
1034 mwifiex_init_module(void)
1035 {
1036 #ifdef CONFIG_DEBUG_FS
1037         mwifiex_debugfs_init();
1038 #endif
1039         return 0;
1040 }
1041
1042 /*
1043  * This function cleans up the module.
1044  *
1045  * The debug FS is removed if available.
1046  */
1047 static void
1048 mwifiex_cleanup_module(void)
1049 {
1050 #ifdef CONFIG_DEBUG_FS
1051         mwifiex_debugfs_remove();
1052 #endif
1053 }
1054
1055 module_init(mwifiex_init_module);
1056 module_exit(mwifiex_cleanup_module);
1057
1058 MODULE_AUTHOR("Marvell International Ltd.");
1059 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1060 MODULE_VERSION(VERSION);
1061 MODULE_LICENSE("GPL v2");