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