drivers/net/wireless/mwifiex/main.c

   1 /*
   2  * Marvell Wireless LAN device driver: major functions
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "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         spinlock_t *scan_q_lock = &adapter->scan_pending_q_lock;
  37         unsigned long flags;
  38
  39         if (adapter->surprise_removed)
  40                 return;
  41
  42         if (adapter->scan_delay_cnt == MWIFIEX_MAX_SCAN_DELAY_CNT ||
  43             !adapter->scan_processing) {
  44                 /*
  45                  * Abort scan operation by cancelling all pending scan
  46                  * commands
  47                  */
  48                 spin_lock_irqsave(scan_q_lock, flags);
  49                 list_for_each_entry_safe(cmd_node, tmp_node,
  50                                          &adapter->scan_pending_q, list) {
  51                         list_del(&cmd_node->list);
  52                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
  53                 }
  54                 spin_unlock_irqrestore(scan_q_lock, flags);
  55
  56                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
  57                 adapter->scan_processing = false;
  58                 adapter->scan_delay_cnt = 0;
  59                 adapter->empty_tx_q_cnt = 0;
  60                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
  61
  62                 if (priv->scan_request) {
  63                         dev_dbg(adapter->dev, "info: aborting scan\n");
  64                         cfg80211_scan_done(priv->scan_request, 1);
  65                         priv->scan_request = NULL;
  66                 } else {
  67                         priv->scan_aborting = false;
  68                         dev_dbg(adapter->dev, "info: scan already aborted\n");
  69                 }
  70                 goto done;
  71         }
  72
  73         if (!atomic_read(&priv->adapter->is_tx_received)) {
  74                 adapter->empty_tx_q_cnt++;
  75                 if (adapter->empty_tx_q_cnt == MWIFIEX_MAX_EMPTY_TX_Q_CNT) {
  76                         /*
  77                          * No Tx traffic for 200msec. Get scan command from
  78                          * scan pending queue and put to cmd pending queue to
  79                          * resume scan operation
  80                          */
  81                         adapter->scan_delay_cnt = 0;
  82                         adapter->empty_tx_q_cnt = 0;
  83                         spin_lock_irqsave(scan_q_lock, flags);
  84
  85                         if (list_empty(&adapter->scan_pending_q)) {
  86                                 spin_unlock_irqrestore(scan_q_lock, flags);
  87                                 goto done;
  88                         }
  89
  90                         cmd_node = list_first_entry(&adapter->scan_pending_q,
  91                                                     struct cmd_ctrl_node, list);
  92                         list_del(&cmd_node->list);
  93                         spin_unlock_irqrestore(scan_q_lock, flags);
  94
  95                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
  96                                                         true);
  97                         queue_work(adapter->workqueue, &adapter->main_work);
  98                         goto done;
  99                 }
 100         } else {
 101                 adapter->empty_tx_q_cnt = 0;
 102         }
 103
 104         /* Delay scan operation further by 20msec */
 105         mod_timer(&priv->scan_delay_timer, jiffies +
 106                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
 107         adapter->scan_delay_cnt++;
 108
 109 done:
 110         if (atomic_read(&priv->adapter->is_tx_received))
 111                 atomic_set(&priv->adapter->is_tx_received, false);
 112
 113         return;
 114 }
 115
 116 /*
 117  * This function registers the device and performs all the necessary
 118  * initializations.
 119  *
 120  * The following initialization operations are performed -
 121  *      - Allocate adapter structure
 122  *      - Save interface specific operations table in adapter
 123  *      - Call interface specific initialization routine
 124  *      - Allocate private structures
 125  *      - Set default adapter structure parameters
 126  *      - Initialize locks
 127  *
 128  * In case of any errors during inittialization, this function also ensures
 129  * proper cleanup before exiting.
 130  */
 131 static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
 132                             void **padapter)
 133 {
 134         struct mwifiex_adapter *adapter;
 135         int i;
 136
 137         adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
 138         if (!adapter)
 139                 return -ENOMEM;
 140
 141         *padapter = adapter;
 142         adapter->card = card;
 143
 144         /* Save interface specific operations in adapter */
 145         memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
 146
 147         /* card specific initialization has been deferred until now .. */
 148         if (adapter->if_ops.init_if)
 149                 if (adapter->if_ops.init_if(adapter))
 150                         goto error;
 151
 152         adapter->priv_num = 0;
 153
 154         for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
 155                 /* Allocate memory for private structure */
 156                 adapter->priv[i] =
 157                         kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
 158                 if (!adapter->priv[i])
 159                         goto error;
 160
 161                 adapter->priv[i]->adapter = adapter;
 162                 adapter->priv_num++;
 163
 164                 setup_timer(&adapter->priv[i]->scan_delay_timer,
 165                             scan_delay_timer_fn,
 166                             (unsigned long)adapter->priv[i]);
 167         }
 168         mwifiex_init_lock_list(adapter);
 169
 170         init_timer(&adapter->cmd_timer);
 171         adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
 172         adapter->cmd_timer.data = (unsigned long) adapter;
 173
 174         return 0;
 175
 176 error:
 177         dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");
 178
 179         for (i = 0; i < adapter->priv_num; i++)
 180                 kfree(adapter->priv[i]);
 181
 182         kfree(adapter);
 183
 184         return -1;
 185 }
 186
 187 /*
 188  * This function unregisters the device and performs all the necessary
 189  * cleanups.
 190  *
 191  * The following cleanup operations are performed -
 192  *      - Free the timers
 193  *      - Free beacon buffers
 194  *      - Free private structures
 195  *      - Free adapter structure
 196  */
 197 static int mwifiex_unregister(struct mwifiex_adapter *adapter)
 198 {
 199         s32 i;
 200
 201         if (adapter->if_ops.cleanup_if)
 202                 adapter->if_ops.cleanup_if(adapter);
 203
 204         del_timer_sync(&adapter->cmd_timer);
 205
 206         /* Free private structures */
 207         for (i = 0; i < adapter->priv_num; i++) {
 208                 if (adapter->priv[i]) {
 209                         mwifiex_free_curr_bcn(adapter->priv[i]);
 210                         del_timer_sync(&adapter->priv[i]->scan_delay_timer);
 211                         kfree(adapter->priv[i]);
 212                 }
 213         }
 214
 215         kfree(adapter);
 216         return 0;
 217 }
 218
 219 /*
 220  * The main process.
 221  *
 222  * This function is the main procedure of the driver and handles various driver
 223  * operations. It runs in a loop and provides the core functionalities.
 224  *
 225  * The main responsibilities of this function are -
 226  *      - Ensure concurrency control
 227  *      - Handle pending interrupts and call interrupt handlers
 228  *      - Wake up the card if required
 229  *      - Handle command responses and call response handlers
 230  *      - Handle events and call event handlers
 231  *      - Execute pending commands
 232  *      - Transmit pending data packets
 233  */
 234 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 235 {
 236         int ret = 0;
 237         unsigned long flags;
 238         struct sk_buff *skb;
 239
 240         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 241
 242         /* Check if already processing */
 243         if (adapter->mwifiex_processing) {
 244                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 245                 goto exit_main_proc;
 246         } else {
 247                 adapter->mwifiex_processing = true;
 248                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 249         }
 250 process_start:
 251         do {
 252                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 253                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 254                         break;
 255
 256                 /* Handle pending interrupt if any */
 257                 if (adapter->int_status) {
 258                         if (adapter->hs_activated)
 259                                 mwifiex_process_hs_config(adapter);
 260                         if (adapter->if_ops.process_int_status)
 261                                 adapter->if_ops.process_int_status(adapter);
 262                 }
 263
 264                 /* Need to wake up the card ? */
 265                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 266                     (adapter->pm_wakeup_card_req &&
 267                      !adapter->pm_wakeup_fw_try) &&
 268                     (is_command_pending(adapter) ||
 269                      !mwifiex_wmm_lists_empty(adapter))) {
 270                         adapter->pm_wakeup_fw_try = true;
 271                         adapter->if_ops.wakeup(adapter);
 272                         continue;
 273                 }
 274
 275                 if (IS_CARD_RX_RCVD(adapter)) {
 276                         adapter->pm_wakeup_fw_try = false;
 277                         if (adapter->ps_state == PS_STATE_SLEEP)
 278                                 adapter->ps_state = PS_STATE_AWAKE;
 279                 } else {
 280                         /* We have tried to wakeup the card already */
 281                         if (adapter->pm_wakeup_fw_try)
 282                                 break;
 283                         if (adapter->ps_state != PS_STATE_AWAKE ||
 284                             adapter->tx_lock_flag)
 285                                 break;
 286
 287                         if ((adapter->scan_processing &&
 288                              !adapter->scan_delay_cnt) || adapter->data_sent ||
 289                             mwifiex_wmm_lists_empty(adapter)) {
 290                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 291                                     (!is_command_pending(adapter)))
 292                                         break;
 293                         }
 294                 }
 295
 296                 /* Check Rx data for USB */
 297                 if (adapter->iface_type == MWIFIEX_USB)
 298                         while ((skb = skb_dequeue(&adapter->usb_rx_data_q)))
 299                                 mwifiex_handle_rx_packet(adapter, skb);
 300
 301                 /* Check for event */
 302                 if (adapter->event_received) {
 303                         adapter->event_received = false;
 304                         mwifiex_process_event(adapter);
 305                 }
 306
 307                 /* Check for Cmd Resp */
 308                 if (adapter->cmd_resp_received) {
 309                         adapter->cmd_resp_received = false;
 310                         mwifiex_process_cmdresp(adapter);
 311
 312                         /* call mwifiex back when init_fw is done */
 313                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 314                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 315                                 mwifiex_init_fw_complete(adapter);
 316                         }
 317                 }
 318
 319                 /* Check if we need to confirm Sleep Request
 320                    received previously */
 321                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 322                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 323                                 mwifiex_check_ps_cond(adapter);
 324                 }
 325
 326                 /* * The ps_state may have been changed during processing of
 327                  * Sleep Request event.
 328                  */
 329                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 330                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 331                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 332                     adapter->tx_lock_flag)
 333                         continue;
 334
 335                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 336                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 337                                 ret = -1;
 338                                 break;
 339                         }
 340                 }
 341
 342                 if ((!adapter->scan_processing || adapter->scan_delay_cnt) &&
 343                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 344                         mwifiex_wmm_process_tx(adapter);
 345                         if (adapter->hs_activated) {
 346                                 adapter->is_hs_configured = false;
 347                                 mwifiex_hs_activated_event
 348                                         (mwifiex_get_priv
 349                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 350                                          false);
 351                         }
 352                 }
 353
 354                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 355                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 356                     mwifiex_wmm_lists_empty(adapter)) {
 357                         if (!mwifiex_send_null_packet
 358                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 359                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 360                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 361                                 adapter->delay_null_pkt = false;
 362                                 adapter->ps_state = PS_STATE_SLEEP;
 363                         }
 364                         break;
 365                 }
 366         } while (true);
 367
 368         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 369         if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
 370                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 371                 goto process_start;
 372         }
 373
 374         adapter->mwifiex_processing = false;
 375         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 376
 377 exit_main_proc:
 378         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 379                 mwifiex_shutdown_drv(adapter);
 380         return ret;
 381 }
 382 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 383
 384 /*
 385  * This function frees the adapter structure.
 386  *
 387  * Additionally, this closes the netlink socket, frees the timers
 388  * and private structures.
 389  */
 390 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 391 {
 392         if (!adapter) {
 393                 pr_err("%s: adapter is NULL\n", __func__);
 394                 return;
 395         }
 396
 397         mwifiex_unregister(adapter);
 398         pr_debug("info: %s: free adapter\n", __func__);
 399 }
 400
 401 /*
 402  * This function cancels all works in the queue and destroys
 403  * the main workqueue.
 404  */
 405 static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 406 {
 407         flush_workqueue(adapter->workqueue);
 408         destroy_workqueue(adapter->workqueue);
 409         adapter->workqueue = NULL;
 410 }
 411
 412 /*
 413  * This function gets firmware and initializes it.
 414  *
 415  * The main initialization steps followed are -
 416  *      - Download the correct firmware to card
 417  *      - Issue the init commands to firmware
 418  */
 419 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 420 {
 421         int ret;
 422         char fmt[64];
 423         struct mwifiex_private *priv;
 424         struct mwifiex_adapter *adapter = context;
 425         struct mwifiex_fw_image fw;
 426         struct semaphore *sem = adapter->card_sem;
 427         bool init_failed = false;
 428         struct wireless_dev *wdev;
 429
 430         if (!firmware) {
 431                 dev_err(adapter->dev,
 432                         "Failed to get firmware %s\n", adapter->fw_name);
 433                 goto err_dnld_fw;
 434         }
 435
 436         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 437         adapter->firmware = firmware;
 438         fw.fw_buf = (u8 *) adapter->firmware->data;
 439         fw.fw_len = adapter->firmware->size;
 440
 441         if (adapter->if_ops.dnld_fw)
 442                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 443         else
 444                 ret = mwifiex_dnld_fw(adapter, &fw);
 445         if (ret == -1)
 446                 goto err_dnld_fw;
 447
 448         dev_notice(adapter->dev, "WLAN FW is active\n");
 449
 450         if (cal_data_cfg) {
 451                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 452                                       adapter->dev)) < 0)
 453                         dev_err(adapter->dev,
 454                                 "Cal data request_firmware() failed\n");
 455         }
 456
 457         /* enable host interrupt after fw dnld is successful */
 458         if (adapter->if_ops.enable_int) {
 459                 if (adapter->if_ops.enable_int(adapter))
 460                         goto err_dnld_fw;
 461         }
 462
 463         adapter->init_wait_q_woken = false;
 464         ret = mwifiex_init_fw(adapter);
 465         if (ret == -1) {
 466                 goto err_init_fw;
 467         } else if (!ret) {
 468                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 469                 goto done;
 470         }
 471         /* Wait for mwifiex_init to complete */
 472         wait_event_interruptible(adapter->init_wait_q,
 473                                  adapter->init_wait_q_woken);
 474         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 475                 goto err_init_fw;
 476
 477         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 478         if (mwifiex_register_cfg80211(adapter)) {
 479                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 480                 goto err_init_fw;
 481         }
 482
 483         rtnl_lock();
 484         /* Create station interface by default */
 485         wdev = mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 486                                         NL80211_IFTYPE_STATION, NULL, NULL);
 487         if (IS_ERR(wdev)) {
 488                 dev_err(adapter->dev, "cannot create default STA interface\n");
 489                 rtnl_unlock();
 490                 goto err_add_intf;
 491         }
 492         rtnl_unlock();
 493
 494         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 495         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 496         goto done;
 497
 498 err_add_intf:
 499         wiphy_unregister(adapter->wiphy);
 500         wiphy_free(adapter->wiphy);
 501 err_init_fw:
 502         if (adapter->if_ops.disable_int)
 503                 adapter->if_ops.disable_int(adapter);
 504 err_dnld_fw:
 505         pr_debug("info: %s: unregister device\n", __func__);
 506         if (adapter->if_ops.unregister_dev)
 507                 adapter->if_ops.unregister_dev(adapter);
 508
 509         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 510             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 511                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 512                 adapter->init_wait_q_woken = false;
 513
 514                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 515                         wait_event_interruptible(adapter->init_wait_q,
 516                                                  adapter->init_wait_q_woken);
 517         }
 518         adapter->surprise_removed = true;
 519         mwifiex_terminate_workqueue(adapter);
 520         init_failed = true;
 521 done:
 522         if (adapter->cal_data) {
 523                 release_firmware(adapter->cal_data);
 524                 adapter->cal_data = NULL;
 525         }
 526         if (adapter->firmware) {
 527                 release_firmware(adapter->firmware);
 528                 adapter->firmware = NULL;
 529         }
 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         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 544                                       adapter->dev, GFP_KERNEL, adapter,
 545                                       mwifiex_fw_dpc);
 546         if (ret < 0)
 547                 dev_err(adapter->dev,
 548                         "request_firmware_nowait() returned error %d\n", ret);
 549         return ret;
 550 }
 551
 552 /*
 553  * CFG802.11 network device handler for open.
 554  *
 555  * Starts the data queue.
 556  */
 557 static int
 558 mwifiex_open(struct net_device *dev)
 559 {
 560         netif_tx_start_all_queues(dev);
 561         return 0;
 562 }
 563
 564 /*
 565  * CFG802.11 network device handler for close.
 566  */
 567 static int
 568 mwifiex_close(struct net_device *dev)
 569 {
 570         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 571
 572         if (priv->scan_request) {
 573                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 574                 cfg80211_scan_done(priv->scan_request, 1);
 575                 priv->scan_request = NULL;
 576                 priv->scan_aborting = true;
 577         }
 578
 579         return 0;
 580 }
 581
 582 /*
 583  * Add buffer into wmm tx queue and queue work to transmit it.
 584  */
 585 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 586 {
 587         struct netdev_queue *txq;
 588         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 589
 590         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 591                 txq = netdev_get_tx_queue(priv->netdev, index);
 592                 if (!netif_tx_queue_stopped(txq)) {
 593                         netif_tx_stop_queue(txq);
 594                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 595                 }
 596         }
 597
 598         atomic_inc(&priv->adapter->tx_pending);
 599         mwifiex_wmm_add_buf_txqueue(priv, skb);
 600
 601         if (priv->adapter->scan_delay_cnt)
 602                 atomic_set(&priv->adapter->is_tx_received, true);
 603
 604         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 605
 606         return 0;
 607 }
 608
 609 /*
 610  * CFG802.11 network device handler for data transmission.
 611  */
 612 static int
 613 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 614 {
 615         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 616         struct sk_buff *new_skb;
 617         struct mwifiex_txinfo *tx_info;
 618
 619         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 620                 jiffies, priv->bss_type, priv->bss_num);
 621
 622         if (priv->adapter->surprise_removed) {
 623                 kfree_skb(skb);
 624                 priv->stats.tx_dropped++;
 625                 return 0;
 626         }
 627         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 628                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 629                 kfree_skb(skb);
 630                 priv->stats.tx_dropped++;
 631                 return 0;
 632         }
 633         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 634                 dev_dbg(priv->adapter->dev,
 635                         "data: Tx: insufficient skb headroom %d\n",
 636                         skb_headroom(skb));
 637                 /* Insufficient skb headroom - allocate a new skb */
 638                 new_skb =
 639                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 640                 if (unlikely(!new_skb)) {
 641                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 642                         kfree_skb(skb);
 643                         priv->stats.tx_dropped++;
 644                         return 0;
 645                 }
 646                 kfree_skb(skb);
 647                 skb = new_skb;
 648                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 649                         skb_headroom(skb));
 650         }
 651
 652         tx_info = MWIFIEX_SKB_TXCB(skb);
 653         memset(tx_info, 0, sizeof(*tx_info));
 654         tx_info->bss_num = priv->bss_num;
 655         tx_info->bss_type = priv->bss_type;
 656         tx_info->pkt_len = skb->len;
 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         __net_timestamp(skb);
 666
 667         mwifiex_queue_tx_pkt(priv, skb);
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * CFG802.11 network device handler for setting MAC address.
 674  */
 675 static int
 676 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 677 {
 678         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 679         struct sockaddr *hw_addr = addr;
 680         int ret;
 681
 682         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 683
 684         /* Send request to firmware */
 685         ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 686                                HostCmd_ACT_GEN_SET, 0, NULL, true);
 687
 688         if (!ret)
 689                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 690         else
 691                 dev_err(priv->adapter->dev,
 692                         "set mac address failed: ret=%d\n", ret);
 693
 694         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 695
 696         return ret;
 697 }
 698
 699 /*
 700  * CFG802.11 network device handler for setting multicast list.
 701  */
 702 static void mwifiex_set_multicast_list(struct net_device *dev)
 703 {
 704         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 705         struct mwifiex_multicast_list mcast_list;
 706
 707         if (dev->flags & IFF_PROMISC) {
 708                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 709         } else if (dev->flags & IFF_ALLMULTI ||
 710                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 711                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 712         } else {
 713                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 714                 mcast_list.num_multicast_addr =
 715                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 716         }
 717         mwifiex_request_set_multicast_list(priv, &mcast_list);
 718 }
 719
 720 /*
 721  * CFG802.11 network device handler for transmission timeout.
 722  */
 723 static void
 724 mwifiex_tx_timeout(struct net_device *dev)
 725 {
 726         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 727
 728         priv->num_tx_timeout++;
 729         priv->tx_timeout_cnt++;
 730         dev_err(priv->adapter->dev,
 731                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 732                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 733         mwifiex_set_trans_start(dev);
 734
 735         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 736             priv->adapter->if_ops.card_reset) {
 737                 dev_err(priv->adapter->dev,
 738                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 739                 priv->adapter->if_ops.card_reset(priv->adapter);
 740         }
 741 }
 742
 743 /*
 744  * CFG802.11 network device handler for statistics retrieval.
 745  */
 746 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 747 {
 748         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 749
 750         return &priv->stats;
 751 }
 752
 753 static u16
 754 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb,
 755                                 void *accel_priv, select_queue_fallback_t fallback)
 756 {
 757         skb->priority = cfg80211_classify8021d(skb, NULL);
 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         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 879         adapter->cmd_wait_q.status = 0;
 880         adapter->scan_wait_q_woken = false;
 881
 882         adapter->workqueue =
 883                 alloc_workqueue("MWIFIEX_WORK_QUEUE",
 884                                 WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
 885         if (!adapter->workqueue)
 886                 goto err_kmalloc;
 887
 888         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 889         if (adapter->if_ops.iface_work)
 890                 INIT_WORK(&adapter->iface_work, adapter->if_ops.iface_work);
 891
 892         /* Register the device. Fill up the private data structure with relevant
 893            information from the card. */
 894         if (adapter->if_ops.register_dev(adapter)) {
 895                 pr_err("%s: failed to register mwifiex device\n", __func__);
 896                 goto err_registerdev;
 897         }
 898
 899         if (mwifiex_init_hw_fw(adapter)) {
 900                 pr_err("%s: firmware init failed\n", __func__);
 901                 goto err_init_fw;
 902         }
 903
 904         return 0;
 905
 906 err_init_fw:
 907         pr_debug("info: %s: unregister device\n", __func__);
 908         if (adapter->if_ops.unregister_dev)
 909                 adapter->if_ops.unregister_dev(adapter);
 910         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 911             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 912                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 913                 adapter->init_wait_q_woken = false;
 914
 915                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 916                         wait_event_interruptible(adapter->init_wait_q,
 917                                                  adapter->init_wait_q_woken);
 918         }
 919 err_registerdev:
 920         adapter->surprise_removed = true;
 921         mwifiex_terminate_workqueue(adapter);
 922 err_kmalloc:
 923         mwifiex_free_adapter(adapter);
 924
 925 err_init_sw:
 926         up(sem);
 927
 928 exit_sem_err:
 929         return -1;
 930 }
 931 EXPORT_SYMBOL_GPL(mwifiex_add_card);
 932
 933 /*
 934  * This function removes the card.
 935  *
 936  * This function follows the following major steps to remove the device -
 937  *      - Stop data traffic
 938  *      - Shutdown firmware
 939  *      - Remove the logical interfaces
 940  *      - Terminate the work queue
 941  *      - Unregister the device
 942  *      - Free the adapter structure
 943  */
 944 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
 945 {
 946         struct mwifiex_private *priv = NULL;
 947         int i;
 948
 949         if (down_interruptible(sem))
 950                 goto exit_sem_err;
 951
 952         if (!adapter)
 953                 goto exit_remove;
 954
 955         /* We can no longer handle interrupts once we start doing the teardown
 956          * below. */
 957         if (adapter->if_ops.disable_int)
 958                 adapter->if_ops.disable_int(adapter);
 959
 960         adapter->surprise_removed = true;
 961
 962         /* Stop data */
 963         for (i = 0; i < adapter->priv_num; i++) {
 964                 priv = adapter->priv[i];
 965                 if (priv && priv->netdev) {
 966                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
 967                         if (netif_carrier_ok(priv->netdev))
 968                                 netif_carrier_off(priv->netdev);
 969                 }
 970         }
 971
 972         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
 973         adapter->init_wait_q_woken = false;
 974
 975         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 976                 wait_event_interruptible(adapter->init_wait_q,
 977                                          adapter->init_wait_q_woken);
 978         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
 979         if (atomic_read(&adapter->rx_pending) ||
 980             atomic_read(&adapter->tx_pending) ||
 981             atomic_read(&adapter->cmd_pending)) {
 982                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
 983                        "cmd_pending=%d\n",
 984                        atomic_read(&adapter->rx_pending),
 985                        atomic_read(&adapter->tx_pending),
 986                        atomic_read(&adapter->cmd_pending));
 987         }
 988
 989         for (i = 0; i < adapter->priv_num; i++) {
 990                 priv = adapter->priv[i];
 991
 992                 if (!priv)
 993                         continue;
 994
 995                 rtnl_lock();
 996                 if (priv->wdev && priv->netdev)
 997                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
 998                 rtnl_unlock();
 999         }
1000
1001         wiphy_unregister(adapter->wiphy);
1002         wiphy_free(adapter->wiphy);
1003
1004         mwifiex_terminate_workqueue(adapter);
1005
1006         /* Unregister device */
1007         dev_dbg(adapter->dev, "info: unregister device\n");
1008         if (adapter->if_ops.unregister_dev)
1009                 adapter->if_ops.unregister_dev(adapter);
1010         /* Free adapter structure */
1011         dev_dbg(adapter->dev, "info: free adapter\n");
1012         mwifiex_free_adapter(adapter);
1013
1014 exit_remove:
1015         up(sem);
1016 exit_sem_err:
1017         return 0;
1018 }
1019 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1020
1021 /*
1022  * This function initializes the module.
1023  *
1024  * The debug FS is also initialized if configured.
1025  */
1026 static int
1027 mwifiex_init_module(void)
1028 {
1029 #ifdef CONFIG_DEBUG_FS
1030         mwifiex_debugfs_init();
1031 #endif
1032         return 0;
1033 }
1034
1035 /*
1036  * This function cleans up the module.
1037  *
1038  * The debug FS is removed if available.
1039  */
1040 static void
1041 mwifiex_cleanup_module(void)
1042 {
1043 #ifdef CONFIG_DEBUG_FS
1044         mwifiex_debugfs_remove();
1045 #endif
1046 }
1047
1048 module_init(mwifiex_init_module);
1049 module_exit(mwifiex_cleanup_module);
1050
1051 MODULE_AUTHOR("Marvell International Ltd.");
1052 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1053 MODULE_VERSION(VERSION);
1054 MODULE_LICENSE("GPL v2");