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             !adapter->scan_processing) {
  43                 /*
  44                  * Abort scan operation by cancelling all pending scan
  45                  * commands
  46                  */
  47                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  48                 list_for_each_entry_safe(cmd_node, tmp_node,
  49                                          &adapter->scan_pending_q, list) {
  50                         list_del(&cmd_node->list);
  51                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
  52                 }
  53                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
  54
  55                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
  56                 adapter->scan_processing = false;
  57                 adapter->scan_delay_cnt = 0;
  58                 adapter->empty_tx_q_cnt = 0;
  59                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
  60
  61                 if (priv->scan_request) {
  62                         dev_dbg(adapter->dev, "info: aborting scan\n");
  63                         cfg80211_scan_done(priv->scan_request, 1);
  64                         priv->scan_request = NULL;
  65                 } else {
  66                         priv->scan_aborting = false;
  67                         dev_dbg(adapter->dev, "info: scan already aborted\n");
  68                 }
  69                 goto done;
  70         }
  71
  72         if (!atomic_read(&priv->adapter->is_tx_received)) {
  73                 adapter->empty_tx_q_cnt++;
  74                 if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
  75                         /*
  76                          * No Tx traffic for 200msec. Get scan command from
  77                          * scan pending queue and put to cmd pending queue to
  78                          * resume scan operation
  79                          */
  80                         adapter->scan_delay_cnt = 0;
  81                         adapter->empty_tx_q_cnt = 0;
  82                         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
  83                         cmd_node = list_first_entry(&adapter->scan_pending_q,
  84                                                     struct cmd_ctrl_node, list);
  85                         list_del(&cmd_node->list);
  86                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
  87                                                flags);
  88
  89                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
  90                                                         true);
  91                         queue_work(adapter->workqueue, &adapter->main_work);
  92                         goto done;
  93                 }
  94         } else {
  95                 adapter->empty_tx_q_cnt = 0;
  96         }
  97
  98         /* Delay scan operation further by 20msec */
  99         mod_timer(&priv->scan_delay_timer, jiffies +
 100                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
 101         adapter->scan_delay_cnt++;
 102
 103 done:
 104         if (atomic_read(&priv->adapter->is_tx_received))
 105                 atomic_set(&priv->adapter->is_tx_received, false);
 106
 107         return;
 108 }
 109
 110 /*
 111  * This function registers the device and performs all the necessary
 112  * initializations.
 113  *
 114  * The following initialization operations are performed -
 115  *      - Allocate adapter structure
 116  *      - Save interface specific operations table in adapter
 117  *      - Call interface specific initialization routine
 118  *      - Allocate private structures
 119  *      - Set default adapter structure parameters
 120  *      - Initialize locks
 121  *
 122  * In case of any errors during inittialization, this function also ensures
 123  * proper cleanup before exiting.
 124  */
 125 static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
 126                             void **padapter)
 127 {
 128         struct mwifiex_adapter *adapter;
 129         int i;
 130
 131         adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
 132         if (!adapter)
 133                 return -ENOMEM;
 134
 135         *padapter = adapter;
 136         adapter->card = card;
 137
 138         /* Save interface specific operations in adapter */
 139         memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
 140
 141         /* card specific initialization has been deferred until now .. */
 142         if (adapter->if_ops.init_if)
 143                 if (adapter->if_ops.init_if(adapter))
 144                         goto error;
 145
 146         adapter->priv_num = 0;
 147
 148         for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
 149                 /* Allocate memory for private structure */
 150                 adapter->priv[i] =
 151                         kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
 152                 if (!adapter->priv[i])
 153                         goto error;
 154
 155                 adapter->priv[i]->adapter = adapter;
 156                 adapter->priv_num++;
 157
 158                 setup_timer(&adapter->priv[i]->scan_delay_timer,
 159                             scan_delay_timer_fn,
 160                             (unsigned long)adapter->priv[i]);
 161         }
 162         mwifiex_init_lock_list(adapter);
 163
 164         init_timer(&adapter->cmd_timer);
 165         adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
 166         adapter->cmd_timer.data = (unsigned long) adapter;
 167
 168         return 0;
 169
 170 error:
 171         dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");
 172
 173         for (i = 0; i < adapter->priv_num; i++)
 174                 kfree(adapter->priv[i]);
 175
 176         kfree(adapter);
 177
 178         return -1;
 179 }
 180
 181 /*
 182  * This function unregisters the device and performs all the necessary
 183  * cleanups.
 184  *
 185  * The following cleanup operations are performed -
 186  *      - Free the timers
 187  *      - Free beacon buffers
 188  *      - Free private structures
 189  *      - Free adapter structure
 190  */
 191 static int mwifiex_unregister(struct mwifiex_adapter *adapter)
 192 {
 193         s32 i;
 194
 195         if (adapter->if_ops.cleanup_if)
 196                 adapter->if_ops.cleanup_if(adapter);
 197
 198         del_timer_sync(&adapter->cmd_timer);
 199
 200         /* Free private structures */
 201         for (i = 0; i < adapter->priv_num; i++) {
 202                 if (adapter->priv[i]) {
 203                         mwifiex_free_curr_bcn(adapter->priv[i]);
 204                         del_timer_sync(&adapter->priv[i]->scan_delay_timer);
 205                         kfree(adapter->priv[i]);
 206                 }
 207         }
 208
 209         kfree(adapter);
 210         return 0;
 211 }
 212
 213 /*
 214  * The main process.
 215  *
 216  * This function is the main procedure of the driver and handles various driver
 217  * operations. It runs in a loop and provides the core functionalities.
 218  *
 219  * The main responsibilities of this function are -
 220  *      - Ensure concurrency control
 221  *      - Handle pending interrupts and call interrupt handlers
 222  *      - Wake up the card if required
 223  *      - Handle command responses and call response handlers
 224  *      - Handle events and call event handlers
 225  *      - Execute pending commands
 226  *      - Transmit pending data packets
 227  */
 228 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 229 {
 230         int ret = 0;
 231         unsigned long flags;
 232         struct sk_buff *skb;
 233
 234         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 235
 236         /* Check if already processing */
 237         if (adapter->mwifiex_processing) {
 238                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 239                 goto exit_main_proc;
 240         } else {
 241                 adapter->mwifiex_processing = true;
 242                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 243         }
 244 process_start:
 245         do {
 246                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 247                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 248                         break;
 249
 250                 /* Handle pending interrupt if any */
 251                 if (adapter->int_status) {
 252                         if (adapter->hs_activated)
 253                                 mwifiex_process_hs_config(adapter);
 254                         if (adapter->if_ops.process_int_status)
 255                                 adapter->if_ops.process_int_status(adapter);
 256                 }
 257
 258                 /* Need to wake up the card ? */
 259                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 260                     (adapter->pm_wakeup_card_req &&
 261                      !adapter->pm_wakeup_fw_try) &&
 262                     (is_command_pending(adapter) ||
 263                      !mwifiex_wmm_lists_empty(adapter))) {
 264                         adapter->pm_wakeup_fw_try = true;
 265                         adapter->if_ops.wakeup(adapter);
 266                         continue;
 267                 }
 268
 269                 if (IS_CARD_RX_RCVD(adapter)) {
 270                         adapter->pm_wakeup_fw_try = false;
 271                         if (adapter->ps_state == PS_STATE_SLEEP)
 272                                 adapter->ps_state = PS_STATE_AWAKE;
 273                 } else {
 274                         /* We have tried to wakeup the card already */
 275                         if (adapter->pm_wakeup_fw_try)
 276                                 break;
 277                         if (adapter->ps_state != PS_STATE_AWAKE ||
 278                             adapter->tx_lock_flag)
 279                                 break;
 280
 281                         if ((adapter->scan_processing &&
 282                              !adapter->scan_delay_cnt) || adapter->data_sent ||
 283                             mwifiex_wmm_lists_empty(adapter)) {
 284                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 285                                     (!is_command_pending(adapter)))
 286                                         break;
 287                         }
 288                 }
 289
 290                 /* Check Rx data for USB */
 291                 if (adapter->iface_type == MWIFIEX_USB)
 292                         while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
 293                                 mwifiex_handle_rx_packet(adapter, skb);
 294
 295                 /* Check for event */
 296                 if (adapter->event_received) {
 297                         adapter->event_received = false;
 298                         mwifiex_process_event(adapter);
 299                 }
 300
 301                 /* Check for Cmd Resp */
 302                 if (adapter->cmd_resp_received) {
 303                         adapter->cmd_resp_received = false;
 304                         mwifiex_process_cmdresp(adapter);
 305
 306                         /* call mwifiex back when init_fw is done */
 307                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 308                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 309                                 mwifiex_init_fw_complete(adapter);
 310                         }
 311                 }
 312
 313                 /* Check if we need to confirm Sleep Request
 314                    received previously */
 315                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 316                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 317                                 mwifiex_check_ps_cond(adapter);
 318                 }
 319
 320                 /* * The ps_state may have been changed during processing of
 321                  * Sleep Request event.
 322                  */
 323                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 324                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 325                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 326                     adapter->tx_lock_flag)
 327                         continue;
 328
 329                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 330                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 331                                 ret = -1;
 332                                 break;
 333                         }
 334                 }
 335
 336                 if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
 337                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 338                         mwifiex_wmm_process_tx(adapter);
 339                         if (adapter->hs_activated) {
 340                                 adapter->is_hs_configured = false;
 341                                 mwifiex_hs_activated_event
 342                                         (mwifiex_get_priv
 343                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 344                                          false);
 345                         }
 346                 }
 347
 348                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 349                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 350                     mwifiex_wmm_lists_empty(adapter)) {
 351                         if (!mwifiex_send_null_packet
 352                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 353                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 354                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 355                                 adapter->delay_null_pkt = false;
 356                                 adapter->ps_state = PS_STATE_SLEEP;
 357                         }
 358                         break;
 359                 }
 360         } while (true);
 361
 362         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 363         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
 364                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 365                 goto process_start;
 366         }
 367
 368         adapter->mwifiex_processing = false;
 369         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 370
 371 exit_main_proc:
 372         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 373                 mwifiex_shutdown_drv(adapter);
 374         return ret;
 375 }
 376 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 377
 378 /*
 379  * This function frees the adapter structure.
 380  *
 381  * Additionally, this closes the netlink socket, frees the timers
 382  * and private structures.
 383  */
 384 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 385 {
 386         if (!adapter) {
 387                 pr_err("%s: adapter is NULL\n", __func__);
 388                 return;
 389         }
 390
 391         mwifiex_unregister(adapter);
 392         pr_debug("info: %s: free adapter\n", __func__);
 393 }
 394
 395 /*
 396  * This function cancels all works in the queue and destroys
 397  * the main workqueue.
 398  */
 399 static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 400 {
 401         flush_workqueue(adapter->workqueue);
 402         destroy_workqueue(adapter->workqueue);
 403         adapter->workqueue = NULL;
 404 }
 405
 406 /*
 407  * This function gets firmware and initializes it.
 408  *
 409  * The main initialization steps followed are -
 410  *      - Download the correct firmware to card
 411  *      - Issue the init commands to firmware
 412  */
 413 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 414 {
 415         int ret;
 416         char fmt[64];
 417         struct mwifiex_private *priv;
 418         struct mwifiex_adapter *adapter = context;
 419         struct mwifiex_fw_image fw;
 420         struct semaphore *sem = adapter->card_sem;
 421         bool init_failed = false;
 422         struct wireless_dev *wdev;
 423
 424         if (!firmware) {
 425                 dev_err(adapter->dev,
 426                         "Failed to get firmware %s\n", adapter->fw_name);
 427                 goto err_dnld_fw;
 428         }
 429
 430         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 431         adapter->firmware = firmware;
 432         fw.fw_buf = (u8 *) adapter->firmware->data;
 433         fw.fw_len = adapter->firmware->size;
 434
 435         if (adapter->if_ops.dnld_fw)
 436                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 437         else
 438                 ret = mwifiex_dnld_fw(adapter, &fw);
 439         if (ret == -1)
 440                 goto err_dnld_fw;
 441
 442         dev_notice(adapter->dev, "WLAN FW is active\n");
 443
 444         if (cal_data_cfg) {
 445                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 446                                       adapter->dev)) < 0)
 447                         dev_err(adapter->dev,
 448                                 "Cal data request_firmware() failed\n");
 449         }
 450
 451         /* enable host interrupt after fw dnld is successful */
 452         if (adapter->if_ops.enable_int) {
 453                 if (adapter->if_ops.enable_int(adapter))
 454                         goto err_dnld_fw;
 455         }
 456
 457         adapter->init_wait_q_woken = false;
 458         ret = mwifiex_init_fw(adapter);
 459         if (ret == -1) {
 460                 goto err_init_fw;
 461         } else if (!ret) {
 462                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 463                 goto done;
 464         }
 465         /* Wait for mwifiex_init to complete */
 466         wait_event_interruptible(adapter->init_wait_q,
 467                                  adapter->init_wait_q_woken);
 468         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 469                 goto err_init_fw;
 470
 471         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 472         if (mwifiex_register_cfg80211(adapter)) {
 473                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 474                 goto err_init_fw;
 475         }
 476
 477         rtnl_lock();
 478         /* Create station interface by default */
 479         wdev = mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 480                                         NL80211_IFTYPE_STATION, NULL, NULL);
 481         if (IS_ERR(wdev)) {
 482                 dev_err(adapter->dev, "cannot create default STA interface\n");
 483                 rtnl_unlock();
 484                 goto err_add_intf;
 485         }
 486         rtnl_unlock();
 487
 488         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 489         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 490         goto done;
 491
 492 err_add_intf:
 493         wiphy_unregister(adapter->wiphy);
 494         wiphy_free(adapter->wiphy);
 495 err_init_fw:
 496         if (adapter->if_ops.disable_int)
 497                 adapter->if_ops.disable_int(adapter);
 498 err_dnld_fw:
 499         pr_debug("info: %s: unregister device\n", __func__);
 500         if (adapter->if_ops.unregister_dev)
 501                 adapter->if_ops.unregister_dev(adapter);
 502
 503         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 504             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 505                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 506                 adapter->init_wait_q_woken = false;
 507
 508                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 509                         wait_event_interruptible(adapter->init_wait_q,
 510                                                  adapter->init_wait_q_woken);
 511         }
 512         adapter->surprise_removed = true;
 513         mwifiex_terminate_workqueue(adapter);
 514         init_failed = true;
 515 done:
 516         if (adapter->cal_data) {
 517                 release_firmware(adapter->cal_data);
 518                 adapter->cal_data = NULL;
 519         }
 520         if (adapter->firmware) {
 521                 release_firmware(adapter->firmware);
 522                 adapter->firmware = NULL;
 523         }
 524         if (init_failed)
 525                 mwifiex_free_adapter(adapter);
 526         up(sem);
 527         return;
 528 }
 529
 530 /*
 531  * This function initializes the hardware and gets firmware.
 532  */
 533 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 534 {
 535         int ret;
 536
 537         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 538                                       adapter->dev, GFP_KERNEL, adapter,
 539                                       mwifiex_fw_dpc);
 540         if (ret < 0)
 541                 dev_err(adapter->dev,
 542                         "request_firmware_nowait() returned error %d\n", ret);
 543         return ret;
 544 }
 545
 546 /*
 547  * CFG802.11 network device handler for open.
 548  *
 549  * Starts the data queue.
 550  */
 551 static int
 552 mwifiex_open(struct net_device *dev)
 553 {
 554         netif_tx_start_all_queues(dev);
 555         return 0;
 556 }
 557
 558 /*
 559  * CFG802.11 network device handler for close.
 560  */
 561 static int
 562 mwifiex_close(struct net_device *dev)
 563 {
 564         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 565
 566         if (priv->scan_request) {
 567                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 568                 cfg80211_scan_done(priv->scan_request, 1);
 569                 priv->scan_request = NULL;
 570                 priv->scan_aborting = true;
 571         }
 572
 573         return 0;
 574 }
 575
 576 /*
 577  * Add buffer into wmm tx queue and queue work to transmit it.
 578  */
 579 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 580 {
 581         struct netdev_queue *txq;
 582         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 583
 584         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 585                 txq = netdev_get_tx_queue(priv->netdev, index);
 586                 if (!netif_tx_queue_stopped(txq)) {
 587                         netif_tx_stop_queue(txq);
 588                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 589                 }
 590         }
 591
 592         atomic_inc(&priv->adapter->tx_pending);
 593         mwifiex_wmm_add_buf_txqueue(priv, skb);
 594
 595         if (priv->adapter->scan_delay_cnt)
 596                 atomic_set(&priv->adapter->is_tx_received, true);
 597
 598         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 599
 600         return 0;
 601 }
 602
 603 /*
 604  * CFG802.11 network device handler for data transmission.
 605  */
 606 static int
 607 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 608 {
 609         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 610         struct sk_buff *new_skb;
 611         struct mwifiex_txinfo *tx_info;
 612         struct timeval tv;
 613
 614         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 615                 jiffies, priv->bss_type, priv->bss_num);
 616
 617         if (priv->adapter->surprise_removed) {
 618                 kfree_skb(skb);
 619                 priv->stats.tx_dropped++;
 620                 return 0;
 621         }
 622         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 623                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 624                 kfree_skb(skb);
 625                 priv->stats.tx_dropped++;
 626                 return 0;
 627         }
 628         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 629                 dev_dbg(priv->adapter->dev,
 630                         "data: Tx: insufficient skb headroom %d\n",
 631                         skb_headroom(skb));
 632                 /* Insufficient skb headroom - allocate a new skb */
 633                 new_skb =
 634                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 635                 if (unlikely(!new_skb)) {
 636                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 637                         kfree_skb(skb);
 638                         priv->stats.tx_dropped++;
 639                         return 0;
 640                 }
 641                 kfree_skb(skb);
 642                 skb = new_skb;
 643                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 644                         skb_headroom(skb));
 645         }
 646
 647         tx_info = MWIFIEX_SKB_TXCB(skb);
 648         memset(tx_info, 0, sizeof(*tx_info));
 649         tx_info->bss_num = priv->bss_num;
 650         tx_info->bss_type = priv->bss_type;
 651         tx_info->pkt_len = skb->len;
 652
 653         /* Record the current time the packet was queued; used to
 654          * determine the amount of time the packet was queued in
 655          * the driver before it was sent to the firmware.
 656          * The delay is then sent along with the packet to the
 657          * firmware for aggregate delay calculation for stats and
 658          * MSDU lifetime expiry.
 659          */
 660         do_gettimeofday(&tv);
 661         skb->tstamp = timeval_to_ktime(tv);
 662
 663         mwifiex_queue_tx_pkt(priv, skb);
 664
 665         return 0;
 666 }
 667
 668 /*
 669  * CFG802.11 network device handler for setting MAC address.
 670  */
 671 static int
 672 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 673 {
 674         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 675         struct sockaddr *hw_addr = addr;
 676         int ret;
 677
 678         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 679
 680         /* Send request to firmware */
 681         ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 682                                HostCmd_ACT_GEN_SET, 0, NULL, true);
 683
 684         if (!ret)
 685                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 686         else
 687                 dev_err(priv->adapter->dev,
 688                         "set mac address failed: ret=%d\n", ret);
 689
 690         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 691
 692         return ret;
 693 }
 694
 695 /*
 696  * CFG802.11 network device handler for setting multicast list.
 697  */
 698 static void mwifiex_set_multicast_list(struct net_device *dev)
 699 {
 700         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 701         struct mwifiex_multicast_list mcast_list;
 702
 703         if (dev->flags & IFF_PROMISC) {
 704                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 705         } else if (dev->flags & IFF_ALLMULTI ||
 706                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 707                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 708         } else {
 709                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 710                 mcast_list.num_multicast_addr =
 711                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 712         }
 713         mwifiex_request_set_multicast_list(priv, &mcast_list);
 714 }
 715
 716 /*
 717  * CFG802.11 network device handler for transmission timeout.
 718  */
 719 static void
 720 mwifiex_tx_timeout(struct net_device *dev)
 721 {
 722         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 723
 724         priv->num_tx_timeout++;
 725         priv->tx_timeout_cnt++;
 726         dev_err(priv->adapter->dev,
 727                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 728                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 729         mwifiex_set_trans_start(dev);
 730
 731         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 732             priv->adapter->if_ops.card_reset) {
 733                 dev_err(priv->adapter->dev,
 734                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 735                 priv->adapter->if_ops.card_reset(priv->adapter);
 736         }
 737 }
 738
 739 /*
 740  * CFG802.11 network device handler for statistics retrieval.
 741  */
 742 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 743 {
 744         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 745
 746         return &priv->stats;
 747 }
 748
 749 static u16
 750 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb,
 751                                 void *accel_priv, select_queue_fallback_t fallback)
 752 {
 753         skb->priority = cfg80211_classify8021d(skb, NULL);
 754         return mwifiex_1d_to_wmm_queue[skb->priority];
 755 }
 756
 757 /* Network device handlers */
 758 static const struct net_device_ops mwifiex_netdev_ops = {
 759         .ndo_open = mwifiex_open,
 760         .ndo_stop = mwifiex_close,
 761         .ndo_start_xmit = mwifiex_hard_start_xmit,
 762         .ndo_set_mac_address = mwifiex_set_mac_address,
 763         .ndo_tx_timeout = mwifiex_tx_timeout,
 764         .ndo_get_stats = mwifiex_get_stats,
 765         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 766         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 767 };
 768
 769 /*
 770  * This function initializes the private structure parameters.
 771  *
 772  * The following wait queues are initialized -
 773  *      - IOCTL wait queue
 774  *      - Command wait queue
 775  *      - Statistics wait queue
 776  *
 777  * ...and the following default parameters are set -
 778  *      - Current key index     : Set to 0
 779  *      - Rate index            : Set to auto
 780  *      - Media connected       : Set to disconnected
 781  *      - Adhoc link sensed     : Set to false
 782  *      - Nick name             : Set to null
 783  *      - Number of Tx timeout  : Set to 0
 784  *      - Device address        : Set to current address
 785  *
 786  * In addition, the CFG80211 work queue is also created.
 787  */
 788 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 789                                                 struct net_device *dev)
 790 {
 791         dev->netdev_ops = &mwifiex_netdev_ops;
 792         dev->destructor = free_netdev;
 793         /* Initialize private structure */
 794         priv->current_key_index = 0;
 795         priv->media_connected = false;
 796         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 797         memset(priv->mgmt_ie, 0,
 798                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 799         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 800         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 801         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 802         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 803         priv->num_tx_timeout = 0;
 804         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 805 }
 806
 807 /*
 808  * This function check if command is pending.
 809  */
 810 int is_command_pending(struct mwifiex_adapter *adapter)
 811 {
 812         unsigned long flags;
 813         int is_cmd_pend_q_empty;
 814
 815         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 816         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 817         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 818
 819         return !is_cmd_pend_q_empty;
 820 }
 821
 822 /*
 823  * This is the main work queue function.
 824  *
 825  * It handles the main process, which in turn handles the complete
 826  * driver operations.
 827  */
 828 static void mwifiex_main_work_queue(struct work_struct *work)
 829 {
 830         struct mwifiex_adapter *adapter =
 831                 container_of(work, struct mwifiex_adapter, main_work);
 832
 833         if (adapter->surprise_removed)
 834                 return;
 835         mwifiex_main_process(adapter);
 836 }
 837
 838 /*
 839  * This function adds the card.
 840  *
 841  * This function follows the following major steps to set up the device -
 842  *      - Initialize software. This includes probing the card, registering
 843  *        the interface operations table, and allocating/initializing the
 844  *        adapter structure
 845  *      - Set up the netlink socket
 846  *      - Create and start the main work queue
 847  *      - Register the device
 848  *      - Initialize firmware and hardware
 849  *      - Add logical interfaces
 850  */
 851 int
 852 mwifiex_add_card(void *card, struct semaphore *sem,
 853                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 854 {
 855         struct mwifiex_adapter *adapter;
 856
 857         if (down_interruptible(sem))
 858                 goto exit_sem_err;
 859
 860         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 861                 pr_err("%s: software init failed\n", __func__);
 862                 goto err_init_sw;
 863         }
 864
 865         adapter->iface_type = iface_type;
 866         adapter->card_sem = sem;
 867
 868         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 869         adapter->surprise_removed = false;
 870         init_waitqueue_head(&adapter->init_wait_q);
 871         adapter->is_suspended = false;
 872         adapter->hs_activated = false;
 873         init_waitqueue_head(&adapter->hs_activate_wait_q);
 874         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 875         adapter->cmd_wait_q.status = 0;
 876         adapter->scan_wait_q_woken = false;
 877
 878         adapter->workqueue =
 879                 alloc_workqueue("MWIFIEX_WORK_QUEUE",
 880                                 WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
 881         if (!adapter->workqueue)
 882                 goto err_kmalloc;
 883
 884         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 885
 886         /* Register the device. Fill up the private data structure with relevant
 887            information from the card. */
 888         if (adapter->if_ops.register_dev(adapter)) {
 889                 pr_err("%s: failed to register mwifiex device\n", __func__);
 890                 goto err_registerdev;
 891         }
 892
 893         if (mwifiex_init_hw_fw(adapter)) {
 894                 pr_err("%s: firmware init failed\n", __func__);
 895                 goto err_init_fw;
 896         }
 897
 898         return 0;
 899
 900 err_init_fw:
 901         pr_debug("info: %s: unregister device\n", __func__);
 902         if (adapter->if_ops.unregister_dev)
 903                 adapter->if_ops.unregister_dev(adapter);
 904         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 905             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 906                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 907                 adapter->init_wait_q_woken = false;
 908
 909                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 910                         wait_event_interruptible(adapter->init_wait_q,
 911                                                  adapter->init_wait_q_woken);
 912         }
 913 err_registerdev:
 914         adapter->surprise_removed = true;
 915         mwifiex_terminate_workqueue(adapter);
 916 err_kmalloc:
 917         mwifiex_free_adapter(adapter);
 918
 919 err_init_sw:
 920         up(sem);
 921
 922 exit_sem_err:
 923         return -1;
 924 }
 925 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 926
 927 /*
 928  * This function removes the card.
 929  *
 930  * This function follows the following major steps to remove the device -
 931  *      - Stop data traffic
 932  *      - Shutdown firmware
 933  *      - Remove the logical interfaces
 934  *      - Terminate the work queue
 935  *      - Unregister the device
 936  *      - Free the adapter structure
 937  */
 938 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 939 {
 940         struct mwifiex_private *priv = NULL;
 941         int i;
 942
 943         if (down_interruptible(sem))
 944                 goto exit_sem_err;
 945
 946         if (!adapter)
 947                 goto exit_remove;
 948
 949         /* We can no longer handle interrupts once we start doing the teardown
 950          * below. */
 951         if (adapter->if_ops.disable_int)
 952                 adapter->if_ops.disable_int(adapter);
 953
 954         adapter->surprise_removed = true;
 955
 956         /* Stop data */
 957         for (i = 0; i < adapter->priv_num; i++) {
 958                 priv = adapter->priv[i];
 959                 if (priv && priv->netdev) {
 960                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 961                         if (netif_carrier_ok(priv->netdev))
 962                                 netif_carrier_off(priv->netdev);
 963                 }
 964         }
 965
 966         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 967         adapter->init_wait_q_woken = false;
 968
 969         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 970                 wait_event_interruptible(adapter->init_wait_q,
 971                                          adapter->init_wait_q_woken);
 972         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 973         if (atomic_read(&adapter->rx_pending) ||
 974             atomic_read(&adapter->tx_pending) ||
 975             atomic_read(&adapter->cmd_pending)) {
 976                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 977                        "cmd_pending=%d\n",
 978                        atomic_read(&adapter->rx_pending),
 979                        atomic_read(&adapter->tx_pending),
 980                        atomic_read(&adapter->cmd_pending));
 981         }
 982
 983         for (i = 0; i < adapter->priv_num; i++) {
 984                 priv = adapter->priv[i];
 985
 986                 if (!priv)
 987                         continue;
 988
 989                 rtnl_lock();
 990                 if (priv->wdev && priv->netdev)
 991                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 992                 rtnl_unlock();
 993         }
 994
 995         wiphy_unregister(adapter->wiphy);
 996         wiphy_free(adapter->wiphy);
 997
 998         mwifiex_terminate_workqueue(adapter);
 999
1000         /* Unregister device */
1001         dev_dbg(adapter->dev, "info: unregister device\n");
1002         if (adapter->if_ops.unregister_dev)
1003                 adapter->if_ops.unregister_dev(adapter);
1004         /* Free adapter structure */
1005         dev_dbg(adapter->dev, "info: free adapter\n");
1006         mwifiex_free_adapter(adapter);
1007
1008 exit_remove:
1009         up(sem);
1010 exit_sem_err:
1011         return 0;
1012 }
1013 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1014
1015 /*
1016  * This function initializes the module.
1017  *
1018  * The debug FS is also initialized if configured.
1019  */
1020 static int
1021 mwifiex_init_module(void)
1022 {
1023 #ifdef CONFIG_DEBUG_FS
1024         mwifiex_debugfs_init();
1025 #endif
1026         return 0;
1027 }
1028
1029 /*
1030  * This function cleans up the module.
1031  *
1032  * The debug FS is removed if available.
1033  */
1034 static void
1035 mwifiex_cleanup_module(void)
1036 {
1037 #ifdef CONFIG_DEBUG_FS
1038         mwifiex_debugfs_remove();
1039 #endif
1040 }
1041
1042 module_init(mwifiex_init_module);
1043 module_exit(mwifiex_cleanup_module);
1044
1045 MODULE_AUTHOR("Marvell International Ltd.");
1046 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1047 MODULE_VERSION(VERSION);
1048 MODULE_LICENSE("GPL v2");