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         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 362         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
 363                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 364                 goto process_start;
 365         }
 366
 367         adapter->mwifiex_processing = false;
 368         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 369
 370 exit_main_proc:
 371         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 372                 mwifiex_shutdown_drv(adapter);
 373         return ret;
 374 }
 375 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 376
 377 /*
 378  * This function frees the adapter structure.
 379  *
 380  * Additionally, this closes the netlink socket, frees the timers
 381  * and private structures.
 382  */
 383 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 384 {
 385         if (!adapter) {
 386                 pr_err("%s: adapter is NULL\n", __func__);
 387                 return;
 388         }
 389
 390         mwifiex_unregister(adapter);
 391         pr_debug("info: %s: free adapter\n", __func__);
 392 }
 393
 394 /*
 395  * This function cancels all works in the queue and destroys
 396  * the main workqueue.
 397  */
 398 static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 399 {
 400         flush_workqueue(adapter->workqueue);
 401         destroy_workqueue(adapter->workqueue);
 402         adapter->workqueue = NULL;
 403 }
 404
 405 /*
 406  * This function gets firmware and initializes it.
 407  *
 408  * The main initialization steps followed are -
 409  *      - Download the correct firmware to card
 410  *      - Issue the init commands to firmware
 411  */
 412 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 413 {
 414         int ret;
 415         char fmt[64];
 416         struct mwifiex_private *priv;
 417         struct mwifiex_adapter *adapter = context;
 418         struct mwifiex_fw_image fw;
 419         struct semaphore *sem = adapter->card_sem;
 420         bool init_failed = false;
 421         struct wireless_dev *wdev;
 422
 423         if (!firmware) {
 424                 dev_err(adapter->dev,
 425                         "Failed to get firmware %s\n", adapter->fw_name);
 426                 goto err_dnld_fw;
 427         }
 428
 429         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 430         adapter->firmware = firmware;
 431         fw.fw_buf = (u8 *) adapter->firmware->data;
 432         fw.fw_len = adapter->firmware->size;
 433
 434         if (adapter->if_ops.dnld_fw)
 435                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 436         else
 437                 ret = mwifiex_dnld_fw(adapter, &fw);
 438         if (ret == -1)
 439                 goto err_dnld_fw;
 440
 441         dev_notice(adapter->dev, "WLAN FW is active\n");
 442
 443         if (cal_data_cfg) {
 444                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 445                                       adapter->dev)) < 0)
 446                         dev_err(adapter->dev,
 447                                 "Cal data request_firmware() failed\n");
 448         }
 449
 450         /* enable host interrupt after fw dnld is successful */
 451         if (adapter->if_ops.enable_int) {
 452                 if (adapter->if_ops.enable_int(adapter))
 453                         goto err_dnld_fw;
 454         }
 455
 456         adapter->init_wait_q_woken = false;
 457         ret = mwifiex_init_fw(adapter);
 458         if (ret == -1) {
 459                 goto err_init_fw;
 460         } else if (!ret) {
 461                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 462                 goto done;
 463         }
 464         /* Wait for mwifiex_init to complete */
 465         wait_event_interruptible(adapter->init_wait_q,
 466                                  adapter->init_wait_q_woken);
 467         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 468                 goto err_init_fw;
 469
 470         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 471         if (mwifiex_register_cfg80211(adapter)) {
 472                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 473                 goto err_init_fw;
 474         }
 475
 476         rtnl_lock();
 477         /* Create station interface by default */
 478         wdev = mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 479                                         NL80211_IFTYPE_STATION, NULL, NULL);
 480         if (IS_ERR(wdev)) {
 481                 dev_err(adapter->dev, "cannot create default STA interface\n");
 482                 rtnl_unlock();
 483                 goto err_add_intf;
 484         }
 485         rtnl_unlock();
 486
 487         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 488         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 489         goto done;
 490
 491 err_add_intf:
 492         wiphy_unregister(adapter->wiphy);
 493         wiphy_free(adapter->wiphy);
 494 err_init_fw:
 495         if (adapter->if_ops.disable_int)
 496                 adapter->if_ops.disable_int(adapter);
 497 err_dnld_fw:
 498         pr_debug("info: %s: unregister device\n", __func__);
 499         if (adapter->if_ops.unregister_dev)
 500                 adapter->if_ops.unregister_dev(adapter);
 501
 502         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 503             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 504                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 505                 adapter->init_wait_q_woken = false;
 506
 507                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 508                         wait_event_interruptible(adapter->init_wait_q,
 509                                                  adapter->init_wait_q_woken);
 510         }
 511         adapter->surprise_removed = true;
 512         mwifiex_terminate_workqueue(adapter);
 513         init_failed = true;
 514 done:
 515         if (adapter->cal_data) {
 516                 release_firmware(adapter->cal_data);
 517                 adapter->cal_data = NULL;
 518         }
 519         if (adapter->firmware) {
 520                 release_firmware(adapter->firmware);
 521                 adapter->firmware = NULL;
 522         }
 523         complete(&adapter->fw_load);
 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         init_completion(&adapter->fw_load);
 538         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 539                                       adapter->dev, GFP_KERNEL, adapter,
 540                                       mwifiex_fw_dpc);
 541         if (ret < 0)
 542                 dev_err(adapter->dev,
 543                         "request_firmware_nowait() returned error %d\n", ret);
 544         return ret;
 545 }
 546
 547 /*
 548  * CFG802.11 network device handler for open.
 549  *
 550  * Starts the data queue.
 551  */
 552 static int
 553 mwifiex_open(struct net_device *dev)
 554 {
 555         netif_tx_start_all_queues(dev);
 556         return 0;
 557 }
 558
 559 /*
 560  * CFG802.11 network device handler for close.
 561  */
 562 static int
 563 mwifiex_close(struct net_device *dev)
 564 {
 565         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 566
 567         if (priv->scan_request) {
 568                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 569                 cfg80211_scan_done(priv->scan_request, 1);
 570                 priv->scan_request = NULL;
 571                 priv->scan_aborting = true;
 572         }
 573
 574         return 0;
 575 }
 576
 577 /*
 578  * Add buffer into wmm tx queue and queue work to transmit it.
 579  */
 580 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 581 {
 582         struct netdev_queue *txq;
 583         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 584
 585         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 586                 txq = netdev_get_tx_queue(priv->netdev, index);
 587                 if (!netif_tx_queue_stopped(txq)) {
 588                         netif_tx_stop_queue(txq);
 589                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 590                 }
 591         }
 592
 593         atomic_inc(&priv->adapter->tx_pending);
 594         mwifiex_wmm_add_buf_txqueue(priv, skb);
 595
 596         if (priv->adapter->scan_delay_cnt)
 597                 atomic_set(&priv->adapter->is_tx_received, true);
 598
 599         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 600
 601         return 0;
 602 }
 603
 604 /*
 605  * CFG802.11 network device handler for data transmission.
 606  */
 607 static int
 608 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 609 {
 610         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 611         struct sk_buff *new_skb;
 612         struct mwifiex_txinfo *tx_info;
 613         struct timeval tv;
 614
 615         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 616                 jiffies, priv->bss_type, priv->bss_num);
 617
 618         if (priv->adapter->surprise_removed) {
 619                 kfree_skb(skb);
 620                 priv->stats.tx_dropped++;
 621                 return 0;
 622         }
 623         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 624                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 625                 kfree_skb(skb);
 626                 priv->stats.tx_dropped++;
 627                 return 0;
 628         }
 629         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 630                 dev_dbg(priv->adapter->dev,
 631                         "data: Tx: insufficient skb headroom %d\n",
 632                         skb_headroom(skb));
 633                 /* Insufficient skb headroom - allocate a new skb */
 634                 new_skb =
 635                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 636                 if (unlikely(!new_skb)) {
 637                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 638                         kfree_skb(skb);
 639                         priv->stats.tx_dropped++;
 640                         return 0;
 641                 }
 642                 kfree_skb(skb);
 643                 skb = new_skb;
 644                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 645                         skb_headroom(skb));
 646         }
 647
 648         tx_info = MWIFIEX_SKB_TXCB(skb);
 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_sync(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 682                                     HostCmd_ACT_GEN_SET, 0, NULL);
 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)
 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         adapter->cmd_wait_q_required = false;
 875         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 876         adapter->cmd_wait_q.status = 0;
 877         adapter->scan_wait_q_woken = false;
 878
 879         adapter->workqueue =
 880                 alloc_workqueue("MWIFIEX_WORK_QUEUE",
 881                                 WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
 882         if (!adapter->workqueue)
 883                 goto err_kmalloc;
 884
 885         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 886
 887         /* Register the device. Fill up the private data structure with relevant
 888            information from the card. */
 889         if (adapter->if_ops.register_dev(adapter)) {
 890                 pr_err("%s: failed to register mwifiex device\n", __func__);
 891                 goto err_registerdev;
 892         }
 893
 894         if (mwifiex_init_hw_fw(adapter)) {
 895                 pr_err("%s: firmware init failed\n", __func__);
 896                 goto err_init_fw;
 897         }
 898
 899         return 0;
 900
 901 err_init_fw:
 902         pr_debug("info: %s: unregister device\n", __func__);
 903         if (adapter->if_ops.unregister_dev)
 904                 adapter->if_ops.unregister_dev(adapter);
 905         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 906             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 907                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 908                 adapter->init_wait_q_woken = false;
 909
 910                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 911                         wait_event_interruptible(adapter->init_wait_q,
 912                                                  adapter->init_wait_q_woken);
 913         }
 914 err_registerdev:
 915         adapter->surprise_removed = true;
 916         mwifiex_terminate_workqueue(adapter);
 917 err_kmalloc:
 918         mwifiex_free_adapter(adapter);
 919
 920 err_init_sw:
 921         up(sem);
 922
 923 exit_sem_err:
 924         return -1;
 925 }
 926 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 927
 928 /*
 929  * This function removes the card.
 930  *
 931  * This function follows the following major steps to remove the device -
 932  *      - Stop data traffic
 933  *      - Shutdown firmware
 934  *      - Remove the logical interfaces
 935  *      - Terminate the work queue
 936  *      - Unregister the device
 937  *      - Free the adapter structure
 938  */
 939 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 940 {
 941         struct mwifiex_private *priv = NULL;
 942         int i;
 943
 944         if (down_interruptible(sem))
 945                 goto exit_sem_err;
 946
 947         if (!adapter)
 948                 goto exit_remove;
 949
 950         /* We can no longer handle interrupts once we start doing the teardown
 951          * below. */
 952         if (adapter->if_ops.disable_int)
 953                 adapter->if_ops.disable_int(adapter);
 954
 955         adapter->surprise_removed = true;
 956
 957         /* Stop data */
 958         for (i = 0; i < adapter->priv_num; i++) {
 959                 priv = adapter->priv[i];
 960                 if (priv && priv->netdev) {
 961                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 962                         if (netif_carrier_ok(priv->netdev))
 963                                 netif_carrier_off(priv->netdev);
 964                 }
 965         }
 966
 967         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 968         adapter->init_wait_q_woken = false;
 969
 970         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 971                 wait_event_interruptible(adapter->init_wait_q,
 972                                          adapter->init_wait_q_woken);
 973         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 974         if (atomic_read(&adapter->rx_pending) ||
 975             atomic_read(&adapter->tx_pending) ||
 976             atomic_read(&adapter->cmd_pending)) {
 977                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 978                        "cmd_pending=%d\n",
 979                        atomic_read(&adapter->rx_pending),
 980                        atomic_read(&adapter->tx_pending),
 981                        atomic_read(&adapter->cmd_pending));
 982         }
 983
 984         for (i = 0; i < adapter->priv_num; i++) {
 985                 priv = adapter->priv[i];
 986
 987                 if (!priv)
 988                         continue;
 989
 990                 rtnl_lock();
 991                 if (priv->wdev && priv->netdev)
 992                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 993                 rtnl_unlock();
 994         }
 995
 996         wiphy_unregister(adapter->wiphy);
 997         wiphy_free(adapter->wiphy);
 998
 999         mwifiex_terminate_workqueue(adapter);
1000
1001         /* Unregister device */
1002         dev_dbg(adapter->dev, "info: unregister device\n");
1003         if (adapter->if_ops.unregister_dev)
1004                 adapter->if_ops.unregister_dev(adapter);
1005         /* Free adapter structure */
1006         dev_dbg(adapter->dev, "info: free adapter\n");
1007         mwifiex_free_adapter(adapter);
1008
1009 exit_remove:
1010         up(sem);
1011 exit_sem_err:
1012         return 0;
1013 }
1014 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1015
1016 /*
1017  * This function initializes the module.
1018  *
1019  * The debug FS is also initialized if configured.
1020  */
1021 static int
1022 mwifiex_init_module(void)
1023 {
1024 #ifdef CONFIG_DEBUG_FS
1025         mwifiex_debugfs_init();
1026 #endif
1027         return 0;
1028 }
1029
1030 /*
1031  * This function cleans up the module.
1032  *
1033  * The debug FS is removed if available.
1034  */
1035 static void
1036 mwifiex_cleanup_module(void)
1037 {
1038 #ifdef CONFIG_DEBUG_FS
1039         mwifiex_debugfs_remove();
1040 #endif
1041 }
1042
1043 module_init(mwifiex_init_module);
1044 module_exit(mwifiex_cleanup_module);
1045
1046 MODULE_AUTHOR("Marvell International Ltd.");
1047 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1048 MODULE_VERSION(VERSION);
1049 MODULE_LICENSE("GPL v2");