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 unsigned short driver_mode;
  32 module_param(driver_mode, ushort, 0);
  33 MODULE_PARM_DESC(driver_mode,
  34                  "station=0x1(default), ap-sta=0x3, station-p2p=0x5, ap-sta-p2p=0x7");
  35
  36 /*
  37  * This function registers the device and performs all the necessary
  38  * initializations.
  39  *
  40  * The following initialization operations are performed -
  41  *      - Allocate adapter structure
  42  *      - Save interface specific operations table in adapter
  43  *      - Call interface specific initialization routine
  44  *      - Allocate private structures
  45  *      - Set default adapter structure parameters
  46  *      - Initialize locks
  47  *
  48  * In case of any errors during inittialization, this function also ensures
  49  * proper cleanup before exiting.
  50  */
  51 static int mwifiex_register(void *card, struct mwifiex_if_ops *if_ops,
  52                             void **padapter)
  53 {
  54         struct mwifiex_adapter *adapter;
  55         int i;
  56
  57         adapter = kzalloc(sizeof(struct mwifiex_adapter), GFP_KERNEL);
  58         if (!adapter)
  59                 return -ENOMEM;
  60
  61         *padapter = adapter;
  62         adapter->card = card;
  63
  64         /* Save interface specific operations in adapter */
  65         memmove(&adapter->if_ops, if_ops, sizeof(struct mwifiex_if_ops));
  66
  67         /* card specific initialization has been deferred until now .. */
  68         if (adapter->if_ops.init_if)
  69                 if (adapter->if_ops.init_if(adapter))
  70                         goto error;
  71
  72         adapter->priv_num = 0;
  73
  74         for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
  75                 /* Allocate memory for private structure */
  76                 adapter->priv[i] =
  77                         kzalloc(sizeof(struct mwifiex_private), GFP_KERNEL);
  78                 if (!adapter->priv[i])
  79                         goto error;
  80
  81                 adapter->priv[i]->adapter = adapter;
  82                 adapter->priv_num++;
  83         }
  84         mwifiex_init_lock_list(adapter);
  85
  86         init_timer(&adapter->cmd_timer);
  87         adapter->cmd_timer.function = mwifiex_cmd_timeout_func;
  88         adapter->cmd_timer.data = (unsigned long) adapter;
  89
  90         return 0;
  91
  92 error:
  93         dev_dbg(adapter->dev, "info: leave mwifiex_register with error\n");
  94
  95         for (i = 0; i < adapter->priv_num; i++)
  96                 kfree(adapter->priv[i]);
  97
  98         kfree(adapter);
  99
 100         return -1;
 101 }
 102
 103 /*
 104  * This function unregisters the device and performs all the necessary
 105  * cleanups.
 106  *
 107  * The following cleanup operations are performed -
 108  *      - Free the timers
 109  *      - Free beacon buffers
 110  *      - Free private structures
 111  *      - Free adapter structure
 112  */
 113 static int mwifiex_unregister(struct mwifiex_adapter *adapter)
 114 {
 115         s32 i;
 116
 117         if (adapter->if_ops.cleanup_if)
 118                 adapter->if_ops.cleanup_if(adapter);
 119
 120         del_timer_sync(&adapter->cmd_timer);
 121
 122         /* Free private structures */
 123         for (i = 0; i < adapter->priv_num; i++) {
 124                 if (adapter->priv[i]) {
 125                         mwifiex_free_curr_bcn(adapter->priv[i]);
 126                         kfree(adapter->priv[i]);
 127                 }
 128         }
 129
 130         vfree(adapter->chan_stats);
 131         kfree(adapter);
 132         return 0;
 133 }
 134
 135 static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
 136 {
 137         unsigned long flags;
 138         struct sk_buff *skb;
 139
 140         spin_lock_irqsave(&adapter->rx_proc_lock, flags);
 141         if (adapter->rx_processing || adapter->rx_locked) {
 142                 spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
 143                 goto exit_rx_proc;
 144         } else {
 145                 adapter->rx_processing = true;
 146                 spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
 147         }
 148
 149         /* Check for Rx data */
 150         while ((skb = skb_dequeue(&adapter->rx_data_q))) {
 151                 atomic_dec(&adapter->rx_pending);
 152                 if ((adapter->delay_main_work ||
 153                      adapter->iface_type == MWIFIEX_USB) &&
 154                     (atomic_read(&adapter->rx_pending) < LOW_RX_PENDING)) {
 155                         if (adapter->if_ops.submit_rem_rx_urbs)
 156                                 adapter->if_ops.submit_rem_rx_urbs(adapter);
 157                         adapter->delay_main_work = false;
 158                         queue_work(adapter->workqueue, &adapter->main_work);
 159                 }
 160                 mwifiex_handle_rx_packet(adapter, skb);
 161         }
 162         spin_lock_irqsave(&adapter->rx_proc_lock, flags);
 163         adapter->rx_processing = false;
 164         spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
 165
 166 exit_rx_proc:
 167         return 0;
 168 }
 169
 170 /*
 171  * The main process.
 172  *
 173  * This function is the main procedure of the driver and handles various driver
 174  * operations. It runs in a loop and provides the core functionalities.
 175  *
 176  * The main responsibilities of this function are -
 177  *      - Ensure concurrency control
 178  *      - Handle pending interrupts and call interrupt handlers
 179  *      - Wake up the card if required
 180  *      - Handle command responses and call response handlers
 181  *      - Handle events and call event handlers
 182  *      - Execute pending commands
 183  *      - Transmit pending data packets
 184  */
 185 int mwifiex_main_process(struct mwifiex_adapter *adapter)
 186 {
 187         int ret = 0;
 188         unsigned long flags;
 189
 190         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 191
 192         /* Check if already processing */
 193         if (adapter->mwifiex_processing) {
 194                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 195                 goto exit_main_proc;
 196         } else {
 197                 adapter->mwifiex_processing = true;
 198                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 199         }
 200 process_start:
 201         do {
 202                 if ((adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING) ||
 203                     (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY))
 204                         break;
 205
 206                 /* For non-USB interfaces, If we process interrupts first, it
 207                  * would increase RX pending even further. Avoid this by
 208                  * checking if rx_pending has crossed high threshold and
 209                  * schedule rx work queue and then process interrupts.
 210                  * For USB interface, there are no interrupts. We already have
 211                  * HIGH_RX_PENDING check in usb.c
 212                  */
 213                 if (atomic_read(&adapter->rx_pending) >= HIGH_RX_PENDING &&
 214                     adapter->iface_type != MWIFIEX_USB) {
 215                         adapter->delay_main_work = true;
 216                         if (!adapter->rx_processing)
 217                                 queue_work(adapter->rx_workqueue,
 218                                            &adapter->rx_work);
 219                         break;
 220                 }
 221
 222                 /* Handle pending interrupt if any */
 223                 if (adapter->int_status) {
 224                         if (adapter->hs_activated)
 225                                 mwifiex_process_hs_config(adapter);
 226                         if (adapter->if_ops.process_int_status)
 227                                 adapter->if_ops.process_int_status(adapter);
 228                 }
 229
 230                 if (adapter->rx_work_enabled && adapter->data_received)
 231                         queue_work(adapter->rx_workqueue, &adapter->rx_work);
 232
 233                 /* Need to wake up the card ? */
 234                 if ((adapter->ps_state == PS_STATE_SLEEP) &&
 235                     (adapter->pm_wakeup_card_req &&
 236                      !adapter->pm_wakeup_fw_try) &&
 237                     (is_command_pending(adapter) ||
 238                      !mwifiex_wmm_lists_empty(adapter))) {
 239                         adapter->pm_wakeup_fw_try = true;
 240                         adapter->if_ops.wakeup(adapter);
 241                         continue;
 242                 }
 243
 244                 if (IS_CARD_RX_RCVD(adapter)) {
 245                         adapter->data_received = false;
 246                         adapter->pm_wakeup_fw_try = false;
 247                         if (adapter->ps_state == PS_STATE_SLEEP)
 248                                 adapter->ps_state = PS_STATE_AWAKE;
 249                 } else {
 250                         /* We have tried to wakeup the card already */
 251                         if (adapter->pm_wakeup_fw_try)
 252                                 break;
 253                         if (adapter->ps_state != PS_STATE_AWAKE ||
 254                             adapter->tx_lock_flag)
 255                                 break;
 256
 257                         if ((!adapter->scan_chan_gap_enabled &&
 258                              adapter->scan_processing) || adapter->data_sent ||
 259                             mwifiex_wmm_lists_empty(adapter)) {
 260                                 if (adapter->cmd_sent || adapter->curr_cmd ||
 261                                     (!is_command_pending(adapter)))
 262                                         break;
 263                         }
 264                 }
 265
 266                 /* Check for event */
 267                 if (adapter->event_received) {
 268                         adapter->event_received = false;
 269                         mwifiex_process_event(adapter);
 270                 }
 271
 272                 /* Check for Cmd Resp */
 273                 if (adapter->cmd_resp_received) {
 274                         adapter->cmd_resp_received = false;
 275                         mwifiex_process_cmdresp(adapter);
 276
 277                         /* call mwifiex back when init_fw is done */
 278                         if (adapter->hw_status == MWIFIEX_HW_STATUS_INIT_DONE) {
 279                                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 280                                 mwifiex_init_fw_complete(adapter);
 281                         }
 282                 }
 283
 284                 /* Check if we need to confirm Sleep Request
 285                    received previously */
 286                 if (adapter->ps_state == PS_STATE_PRE_SLEEP) {
 287                         if (!adapter->cmd_sent && !adapter->curr_cmd)
 288                                 mwifiex_check_ps_cond(adapter);
 289                 }
 290
 291                 /* * The ps_state may have been changed during processing of
 292                  * Sleep Request event.
 293                  */
 294                 if ((adapter->ps_state == PS_STATE_SLEEP) ||
 295                     (adapter->ps_state == PS_STATE_PRE_SLEEP) ||
 296                     (adapter->ps_state == PS_STATE_SLEEP_CFM) ||
 297                     adapter->tx_lock_flag)
 298                         continue;
 299
 300                 if (!adapter->cmd_sent && !adapter->curr_cmd) {
 301                         if (mwifiex_exec_next_cmd(adapter) == -1) {
 302                                 ret = -1;
 303                                 break;
 304                         }
 305                 }
 306
 307                 if ((adapter->scan_chan_gap_enabled ||
 308                      !adapter->scan_processing) &&
 309                     !adapter->data_sent && !mwifiex_wmm_lists_empty(adapter)) {
 310                         mwifiex_wmm_process_tx(adapter);
 311                         if (adapter->hs_activated) {
 312                                 adapter->is_hs_configured = false;
 313                                 mwifiex_hs_activated_event
 314                                         (mwifiex_get_priv
 315                                          (adapter, MWIFIEX_BSS_ROLE_ANY),
 316                                          false);
 317                         }
 318                 }
 319
 320                 if (adapter->delay_null_pkt && !adapter->cmd_sent &&
 321                     !adapter->curr_cmd && !is_command_pending(adapter) &&
 322                     mwifiex_wmm_lists_empty(adapter)) {
 323                         if (!mwifiex_send_null_packet
 324                             (mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_STA),
 325                              MWIFIEX_TxPD_POWER_MGMT_NULL_PACKET |
 326                              MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET)) {
 327                                 adapter->delay_null_pkt = false;
 328                                 adapter->ps_state = PS_STATE_SLEEP;
 329                         }
 330                         break;
 331                 }
 332         } while (true);
 333
 334         spin_lock_irqsave(&adapter->main_proc_lock, flags);
 335         if (!adapter->delay_main_work &&
 336             (adapter->int_status || IS_CARD_RX_RCVD(adapter))) {
 337                 spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 338                 goto process_start;
 339         }
 340
 341         adapter->mwifiex_processing = false;
 342         spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
 343
 344 exit_main_proc:
 345         if (adapter->hw_status == MWIFIEX_HW_STATUS_CLOSING)
 346                 mwifiex_shutdown_drv(adapter);
 347         return ret;
 348 }
 349 EXPORT_SYMBOL_GPL(mwifiex_main_process);
 350
 351 /*
 352  * This function frees the adapter structure.
 353  *
 354  * Additionally, this closes the netlink socket, frees the timers
 355  * and private structures.
 356  */
 357 static void mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 358 {
 359         if (!adapter) {
 360                 pr_err("%s: adapter is NULL\n", __func__);
 361                 return;
 362         }
 363
 364         mwifiex_unregister(adapter);
 365         pr_debug("info: %s: free adapter\n", __func__);
 366 }
 367
 368 /*
 369  * This function cancels all works in the queue and destroys
 370  * the main workqueue.
 371  */
 372 static void mwifiex_terminate_workqueue(struct mwifiex_adapter *adapter)
 373 {
 374         flush_workqueue(adapter->workqueue);
 375         destroy_workqueue(adapter->workqueue);
 376         adapter->workqueue = NULL;
 377
 378         if (adapter->rx_workqueue) {
 379                 flush_workqueue(adapter->rx_workqueue);
 380                 destroy_workqueue(adapter->rx_workqueue);
 381                 adapter->rx_workqueue = NULL;
 382         }
 383 }
 384
 385 /*
 386  * This function gets firmware and initializes it.
 387  *
 388  * The main initialization steps followed are -
 389  *      - Download the correct firmware to card
 390  *      - Issue the init commands to firmware
 391  */
 392 static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 393 {
 394         int ret;
 395         char fmt[64];
 396         struct mwifiex_private *priv;
 397         struct mwifiex_adapter *adapter = context;
 398         struct mwifiex_fw_image fw;
 399         struct semaphore *sem = adapter->card_sem;
 400         bool init_failed = false;
 401         struct wireless_dev *wdev;
 402
 403         if (!firmware) {
 404                 dev_err(adapter->dev,
 405                         "Failed to get firmware %s\n", adapter->fw_name);
 406                 goto err_dnld_fw;
 407         }
 408
 409         memset(&fw, 0, sizeof(struct mwifiex_fw_image));
 410         adapter->firmware = firmware;
 411         fw.fw_buf = (u8 *) adapter->firmware->data;
 412         fw.fw_len = adapter->firmware->size;
 413
 414         if (adapter->if_ops.dnld_fw)
 415                 ret = adapter->if_ops.dnld_fw(adapter, &fw);
 416         else
 417                 ret = mwifiex_dnld_fw(adapter, &fw);
 418         if (ret == -1)
 419                 goto err_dnld_fw;
 420
 421         dev_notice(adapter->dev, "WLAN FW is active\n");
 422
 423         if (cal_data_cfg) {
 424                 if ((request_firmware(&adapter->cal_data, cal_data_cfg,
 425                                       adapter->dev)) < 0)
 426                         dev_err(adapter->dev,
 427                                 "Cal data request_firmware() failed\n");
 428         }
 429
 430         /* enable host interrupt after fw dnld is successful */
 431         if (adapter->if_ops.enable_int) {
 432                 if (adapter->if_ops.enable_int(adapter))
 433                         goto err_dnld_fw;
 434         }
 435
 436         adapter->init_wait_q_woken = false;
 437         ret = mwifiex_init_fw(adapter);
 438         if (ret == -1) {
 439                 goto err_init_fw;
 440         } else if (!ret) {
 441                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 442                 goto done;
 443         }
 444         /* Wait for mwifiex_init to complete */
 445         wait_event_interruptible(adapter->init_wait_q,
 446                                  adapter->init_wait_q_woken);
 447         if (adapter->hw_status != MWIFIEX_HW_STATUS_READY)
 448                 goto err_init_fw;
 449
 450         priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
 451         if (mwifiex_register_cfg80211(adapter)) {
 452                 dev_err(adapter->dev, "cannot register with cfg80211\n");
 453                 goto err_init_fw;
 454         }
 455
 456         if (mwifiex_init_channel_scan_gap(adapter)) {
 457                 dev_err(adapter->dev, "could not init channel stats table\n");
 458                 goto err_init_fw;
 459         }
 460
 461         if (driver_mode) {
 462                 driver_mode &= MWIFIEX_DRIVER_MODE_BITMASK;
 463                 driver_mode |= MWIFIEX_DRIVER_MODE_STA;
 464         }
 465
 466         rtnl_lock();
 467         /* Create station interface by default */
 468         wdev = mwifiex_add_virtual_intf(adapter->wiphy, "mlan%d",
 469                                         NL80211_IFTYPE_STATION, NULL, NULL);
 470         if (IS_ERR(wdev)) {
 471                 dev_err(adapter->dev, "cannot create default STA interface\n");
 472                 rtnl_unlock();
 473                 goto err_add_intf;
 474         }
 475
 476         if (driver_mode & MWIFIEX_DRIVER_MODE_UAP) {
 477                 wdev = mwifiex_add_virtual_intf(adapter->wiphy, "uap%d",
 478                                                 NL80211_IFTYPE_AP, NULL, NULL);
 479                 if (IS_ERR(wdev)) {
 480                         dev_err(adapter->dev, "cannot create AP interface\n");
 481                         rtnl_unlock();
 482                         goto err_add_intf;
 483                 }
 484         }
 485
 486         if (driver_mode & MWIFIEX_DRIVER_MODE_P2P) {
 487                 wdev = mwifiex_add_virtual_intf(adapter->wiphy, "p2p%d",
 488                                                 NL80211_IFTYPE_P2P_CLIENT, NULL,
 489                                                 NULL);
 490                 if (IS_ERR(wdev)) {
 491                         dev_err(adapter->dev,
 492                                 "cannot create p2p client interface\n");
 493                         rtnl_unlock();
 494                         goto err_add_intf;
 495                 }
 496         }
 497         rtnl_unlock();
 498
 499         mwifiex_drv_get_driver_version(adapter, fmt, sizeof(fmt) - 1);
 500         dev_notice(adapter->dev, "driver_version = %s\n", fmt);
 501         goto done;
 502
 503 err_add_intf:
 504         wiphy_unregister(adapter->wiphy);
 505         wiphy_free(adapter->wiphy);
 506 err_init_fw:
 507         if (adapter->if_ops.disable_int)
 508                 adapter->if_ops.disable_int(adapter);
 509 err_dnld_fw:
 510         pr_debug("info: %s: unregister device\n", __func__);
 511         if (adapter->if_ops.unregister_dev)
 512                 adapter->if_ops.unregister_dev(adapter);
 513
 514         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
 515             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
 516                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
 517                 adapter->init_wait_q_woken = false;
 518
 519                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
 520                         wait_event_interruptible(adapter->init_wait_q,
 521                                                  adapter->init_wait_q_woken);
 522         }
 523         adapter->surprise_removed = true;
 524         mwifiex_terminate_workqueue(adapter);
 525         init_failed = true;
 526 done:
 527         if (adapter->cal_data) {
 528                 release_firmware(adapter->cal_data);
 529                 adapter->cal_data = NULL;
 530         }
 531         if (adapter->firmware) {
 532                 release_firmware(adapter->firmware);
 533                 adapter->firmware = NULL;
 534         }
 535         if (init_failed)
 536                 mwifiex_free_adapter(adapter);
 537         up(sem);
 538         return;
 539 }
 540
 541 /*
 542  * This function initializes the hardware and gets firmware.
 543  */
 544 static int mwifiex_init_hw_fw(struct mwifiex_adapter *adapter)
 545 {
 546         int ret;
 547
 548         ret = request_firmware_nowait(THIS_MODULE, 1, adapter->fw_name,
 549                                       adapter->dev, GFP_KERNEL, adapter,
 550                                       mwifiex_fw_dpc);
 551         if (ret < 0)
 552                 dev_err(adapter->dev,
 553                         "request_firmware_nowait() returned error %d\n", ret);
 554         return ret;
 555 }
 556
 557 /*
 558  * CFG802.11 network device handler for open.
 559  *
 560  * Starts the data queue.
 561  */
 562 static int
 563 mwifiex_open(struct net_device *dev)
 564 {
 565         netif_tx_start_all_queues(dev);
 566         return 0;
 567 }
 568
 569 /*
 570  * CFG802.11 network device handler for close.
 571  */
 572 static int
 573 mwifiex_close(struct net_device *dev)
 574 {
 575         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 576
 577         if (priv->scan_request) {
 578                 dev_dbg(priv->adapter->dev, "aborting scan on ndo_stop\n");
 579                 cfg80211_scan_done(priv->scan_request, 1);
 580                 priv->scan_request = NULL;
 581                 priv->scan_aborting = true;
 582         }
 583
 584         return 0;
 585 }
 586
 587 /*
 588  * Add buffer into wmm tx queue and queue work to transmit it.
 589  */
 590 int mwifiex_queue_tx_pkt(struct mwifiex_private *priv, struct sk_buff *skb)
 591 {
 592         struct netdev_queue *txq;
 593         int index = mwifiex_1d_to_wmm_queue[skb->priority];
 594
 595         if (atomic_inc_return(&priv->wmm_tx_pending[index]) >= MAX_TX_PENDING) {
 596                 txq = netdev_get_tx_queue(priv->netdev, index);
 597                 if (!netif_tx_queue_stopped(txq)) {
 598                         netif_tx_stop_queue(txq);
 599                         dev_dbg(priv->adapter->dev, "stop queue: %d\n", index);
 600                 }
 601         }
 602
 603         atomic_inc(&priv->adapter->tx_pending);
 604         mwifiex_wmm_add_buf_txqueue(priv, skb);
 605
 606         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
 607
 608         return 0;
 609 }
 610
 611 struct sk_buff *
 612 mwifiex_clone_skb_for_tx_status(struct mwifiex_private *priv,
 613                                 struct sk_buff *skb, u8 flag, u64 *cookie)
 614 {
 615         struct sk_buff *orig_skb = skb;
 616         struct mwifiex_txinfo *tx_info, *orig_tx_info;
 617
 618         skb = skb_clone(skb, GFP_ATOMIC);
 619         if (skb) {
 620                 unsigned long flags;
 621                 int id;
 622
 623                 spin_lock_irqsave(&priv->ack_status_lock, flags);
 624                 id = idr_alloc(&priv->ack_status_frames, orig_skb,
 625                                1, 0xff, GFP_ATOMIC);
 626                 spin_unlock_irqrestore(&priv->ack_status_lock, flags);
 627
 628                 if (id >= 0) {
 629                         tx_info = MWIFIEX_SKB_TXCB(skb);
 630                         tx_info->ack_frame_id = id;
 631                         tx_info->flags |= flag;
 632                         orig_tx_info = MWIFIEX_SKB_TXCB(orig_skb);
 633                         orig_tx_info->ack_frame_id = id;
 634                         orig_tx_info->flags |= flag;
 635
 636                         if (flag == MWIFIEX_BUF_FLAG_ACTION_TX_STATUS && cookie)
 637                                 orig_tx_info->cookie = *cookie;
 638
 639                 } else if (skb_shared(skb)) {
 640                         kfree_skb(orig_skb);
 641                 } else {
 642                         kfree_skb(skb);
 643                         skb = orig_skb;
 644                 }
 645         } else {
 646                 /* couldn't clone -- lose tx status ... */
 647                 skb = orig_skb;
 648         }
 649
 650         return skb;
 651 }
 652
 653 /*
 654  * CFG802.11 network device handler for data transmission.
 655  */
 656 static int
 657 mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 658 {
 659         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 660         struct sk_buff *new_skb;
 661         struct mwifiex_txinfo *tx_info;
 662         bool multicast;
 663
 664         dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
 665                 jiffies, priv->bss_type, priv->bss_num);
 666
 667         if (priv->adapter->surprise_removed) {
 668                 kfree_skb(skb);
 669                 priv->stats.tx_dropped++;
 670                 return 0;
 671         }
 672         if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
 673                 dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
 674                 kfree_skb(skb);
 675                 priv->stats.tx_dropped++;
 676                 return 0;
 677         }
 678         if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
 679                 dev_dbg(priv->adapter->dev,
 680                         "data: Tx: insufficient skb headroom %d\n",
 681                         skb_headroom(skb));
 682                 /* Insufficient skb headroom - allocate a new skb */
 683                 new_skb =
 684                         skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
 685                 if (unlikely(!new_skb)) {
 686                         dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
 687                         kfree_skb(skb);
 688                         priv->stats.tx_dropped++;
 689                         return 0;
 690                 }
 691                 kfree_skb(skb);
 692                 skb = new_skb;
 693                 dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
 694                         skb_headroom(skb));
 695         }
 696
 697         tx_info = MWIFIEX_SKB_TXCB(skb);
 698         memset(tx_info, 0, sizeof(*tx_info));
 699         tx_info->bss_num = priv->bss_num;
 700         tx_info->bss_type = priv->bss_type;
 701         tx_info->pkt_len = skb->len;
 702
 703         multicast = is_multicast_ether_addr(skb->data);
 704
 705         if (unlikely(!multicast && skb->sk &&
 706                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS &&
 707                      priv->adapter->fw_api_ver == MWIFIEX_FW_V15))
 708                 skb = mwifiex_clone_skb_for_tx_status(priv,
 709                                                       skb,
 710                                         MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS, NULL);
 711
 712         /* Record the current time the packet was queued; used to
 713          * determine the amount of time the packet was queued in
 714          * the driver before it was sent to the firmware.
 715          * The delay is then sent along with the packet to the
 716          * firmware for aggregate delay calculation for stats and
 717          * MSDU lifetime expiry.
 718          */
 719         __net_timestamp(skb);
 720
 721         if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
 722             priv->bss_type == MWIFIEX_BSS_TYPE_STA &&
 723             !ether_addr_equal_unaligned(priv->cfg_bssid, skb->data)) {
 724                 if (priv->adapter->auto_tdls && priv->check_tdls_tx)
 725                         mwifiex_tdls_check_tx(priv, skb);
 726         }
 727
 728         mwifiex_queue_tx_pkt(priv, skb);
 729
 730         return 0;
 731 }
 732
 733 /*
 734  * CFG802.11 network device handler for setting MAC address.
 735  */
 736 static int
 737 mwifiex_set_mac_address(struct net_device *dev, void *addr)
 738 {
 739         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 740         struct sockaddr *hw_addr = addr;
 741         int ret;
 742
 743         memcpy(priv->curr_addr, hw_addr->sa_data, ETH_ALEN);
 744
 745         /* Send request to firmware */
 746         ret = mwifiex_send_cmd(priv, HostCmd_CMD_802_11_MAC_ADDRESS,
 747                                HostCmd_ACT_GEN_SET, 0, NULL, true);
 748
 749         if (!ret)
 750                 memcpy(priv->netdev->dev_addr, priv->curr_addr, ETH_ALEN);
 751         else
 752                 dev_err(priv->adapter->dev,
 753                         "set mac address failed: ret=%d\n", ret);
 754
 755         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 756
 757         return ret;
 758 }
 759
 760 /*
 761  * CFG802.11 network device handler for setting multicast list.
 762  */
 763 static void mwifiex_set_multicast_list(struct net_device *dev)
 764 {
 765         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 766         struct mwifiex_multicast_list mcast_list;
 767
 768         if (dev->flags & IFF_PROMISC) {
 769                 mcast_list.mode = MWIFIEX_PROMISC_MODE;
 770         } else if (dev->flags & IFF_ALLMULTI ||
 771                    netdev_mc_count(dev) > MWIFIEX_MAX_MULTICAST_LIST_SIZE) {
 772                 mcast_list.mode = MWIFIEX_ALL_MULTI_MODE;
 773         } else {
 774                 mcast_list.mode = MWIFIEX_MULTICAST_MODE;
 775                 mcast_list.num_multicast_addr =
 776                         mwifiex_copy_mcast_addr(&mcast_list, dev);
 777         }
 778         mwifiex_request_set_multicast_list(priv, &mcast_list);
 779 }
 780
 781 /*
 782  * CFG802.11 network device handler for transmission timeout.
 783  */
 784 static void
 785 mwifiex_tx_timeout(struct net_device *dev)
 786 {
 787         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 788
 789         priv->num_tx_timeout++;
 790         priv->tx_timeout_cnt++;
 791         dev_err(priv->adapter->dev,
 792                 "%lu : Tx timeout(#%d), bss_type-num = %d-%d\n",
 793                 jiffies, priv->tx_timeout_cnt, priv->bss_type, priv->bss_num);
 794         mwifiex_set_trans_start(dev);
 795
 796         if (priv->tx_timeout_cnt > TX_TIMEOUT_THRESHOLD &&
 797             priv->adapter->if_ops.card_reset) {
 798                 dev_err(priv->adapter->dev,
 799                         "tx_timeout_cnt exceeds threshold. Triggering card reset!\n");
 800                 priv->adapter->if_ops.card_reset(priv->adapter);
 801         }
 802 }
 803
 804 /*
 805  * CFG802.11 network device handler for statistics retrieval.
 806  */
 807 static struct net_device_stats *mwifiex_get_stats(struct net_device *dev)
 808 {
 809         struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 810
 811         return &priv->stats;
 812 }
 813
 814 static u16
 815 mwifiex_netdev_select_wmm_queue(struct net_device *dev, struct sk_buff *skb,
 816                                 void *accel_priv, select_queue_fallback_t fallback)
 817 {
 818         skb->priority = cfg80211_classify8021d(skb, NULL);
 819         return mwifiex_1d_to_wmm_queue[skb->priority];
 820 }
 821
 822 /* Network device handlers */
 823 static const struct net_device_ops mwifiex_netdev_ops = {
 824         .ndo_open = mwifiex_open,
 825         .ndo_stop = mwifiex_close,
 826         .ndo_start_xmit = mwifiex_hard_start_xmit,
 827         .ndo_set_mac_address = mwifiex_set_mac_address,
 828         .ndo_tx_timeout = mwifiex_tx_timeout,
 829         .ndo_get_stats = mwifiex_get_stats,
 830         .ndo_set_rx_mode = mwifiex_set_multicast_list,
 831         .ndo_select_queue = mwifiex_netdev_select_wmm_queue,
 832 };
 833
 834 /*
 835  * This function initializes the private structure parameters.
 836  *
 837  * The following wait queues are initialized -
 838  *      - IOCTL wait queue
 839  *      - Command wait queue
 840  *      - Statistics wait queue
 841  *
 842  * ...and the following default parameters are set -
 843  *      - Current key index     : Set to 0
 844  *      - Rate index            : Set to auto
 845  *      - Media connected       : Set to disconnected
 846  *      - Adhoc link sensed     : Set to false
 847  *      - Nick name             : Set to null
 848  *      - Number of Tx timeout  : Set to 0
 849  *      - Device address        : Set to current address
 850  *
 851  * In addition, the CFG80211 work queue is also created.
 852  */
 853 void mwifiex_init_priv_params(struct mwifiex_private *priv,
 854                                                 struct net_device *dev)
 855 {
 856         dev->netdev_ops = &mwifiex_netdev_ops;
 857         dev->destructor = free_netdev;
 858         /* Initialize private structure */
 859         priv->current_key_index = 0;
 860         priv->media_connected = false;
 861         memset(&priv->nick_name, 0, sizeof(priv->nick_name));
 862         memset(priv->mgmt_ie, 0,
 863                sizeof(struct mwifiex_ie) * MAX_MGMT_IE_INDEX);
 864         priv->beacon_idx = MWIFIEX_AUTO_IDX_MASK;
 865         priv->proberesp_idx = MWIFIEX_AUTO_IDX_MASK;
 866         priv->assocresp_idx = MWIFIEX_AUTO_IDX_MASK;
 867         priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
 868         priv->num_tx_timeout = 0;
 869         memcpy(dev->dev_addr, priv->curr_addr, ETH_ALEN);
 870 }
 871
 872 /*
 873  * This function check if command is pending.
 874  */
 875 int is_command_pending(struct mwifiex_adapter *adapter)
 876 {
 877         unsigned long flags;
 878         int is_cmd_pend_q_empty;
 879
 880         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 881         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 882         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 883
 884         return !is_cmd_pend_q_empty;
 885 }
 886
 887 /*
 888  * This is the RX work queue function.
 889  *
 890  * It handles the RX operations.
 891  */
 892 static void mwifiex_rx_work_queue(struct work_struct *work)
 893 {
 894         struct mwifiex_adapter *adapter =
 895                 container_of(work, struct mwifiex_adapter, rx_work);
 896
 897         if (adapter->surprise_removed)
 898                 return;
 899         mwifiex_process_rx(adapter);
 900 }
 901
 902 /*
 903  * This is the main work queue function.
 904  *
 905  * It handles the main process, which in turn handles the complete
 906  * driver operations.
 907  */
 908 static void mwifiex_main_work_queue(struct work_struct *work)
 909 {
 910         struct mwifiex_adapter *adapter =
 911                 container_of(work, struct mwifiex_adapter, main_work);
 912
 913         if (adapter->surprise_removed)
 914                 return;
 915         mwifiex_main_process(adapter);
 916 }
 917
 918 /*
 919  * This function adds the card.
 920  *
 921  * This function follows the following major steps to set up the device -
 922  *      - Initialize software. This includes probing the card, registering
 923  *        the interface operations table, and allocating/initializing the
 924  *        adapter structure
 925  *      - Set up the netlink socket
 926  *      - Create and start the main work queue
 927  *      - Register the device
 928  *      - Initialize firmware and hardware
 929  *      - Add logical interfaces
 930  */
 931 int
 932 mwifiex_add_card(void *card, struct semaphore *sem,
 933                  struct mwifiex_if_ops *if_ops, u8 iface_type)
 934 {
 935         struct mwifiex_adapter *adapter;
 936
 937         if (down_interruptible(sem))
 938                 goto exit_sem_err;
 939
 940         if (mwifiex_register(card, if_ops, (void **)&adapter)) {
 941                 pr_err("%s: software init failed\n", __func__);
 942                 goto err_init_sw;
 943         }
 944
 945         adapter->iface_type = iface_type;
 946         adapter->card_sem = sem;
 947
 948         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 949         adapter->surprise_removed = false;
 950         init_waitqueue_head(&adapter->init_wait_q);
 951         adapter->is_suspended = false;
 952         adapter->hs_activated = false;
 953         init_waitqueue_head(&adapter->hs_activate_wait_q);
 954         init_waitqueue_head(&adapter->cmd_wait_q.wait);
 955         adapter->cmd_wait_q.status = 0;
 956         adapter->scan_wait_q_woken = false;
 957
 958         if ((num_possible_cpus() > 1) || adapter->iface_type == MWIFIEX_USB) {
 959                 adapter->rx_work_enabled = true;
 960                 pr_notice("rx work enabled, cpus %d\n", num_possible_cpus());
 961         }
 962
 963         adapter->workqueue =
 964                 alloc_workqueue("MWIFIEX_WORK_QUEUE",
 965                                 WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
 966         if (!adapter->workqueue)
 967                 goto err_kmalloc;
 968
 969         INIT_WORK(&adapter->main_work, mwifiex_main_work_queue);
 970
 971         if (adapter->rx_work_enabled) {
 972                 adapter->rx_workqueue = alloc_workqueue("MWIFIEX_RX_WORK_QUEUE",
 973                                                         WQ_HIGHPRI |
 974                                                         WQ_MEM_RECLAIM |
 975                                                         WQ_UNBOUND, 1);
 976                 if (!adapter->rx_workqueue)
 977                         goto err_kmalloc;
 978
 979                 INIT_WORK(&adapter->rx_work, mwifiex_rx_work_queue);
 980         }
 981
 982         if (adapter->if_ops.iface_work)
 983                 INIT_WORK(&adapter->iface_work, adapter->if_ops.iface_work);
 984
 985         /* Register the device. Fill up the private data structure with relevant
 986            information from the card. */
 987         if (adapter->if_ops.register_dev(adapter)) {
 988                 pr_err("%s: failed to register mwifiex device\n", __func__);
 989                 goto err_registerdev;
 990         }
 991
 992         if (mwifiex_init_hw_fw(adapter)) {
 993                 pr_err("%s: firmware init failed\n", __func__);
 994                 goto err_init_fw;
 995         }
 996
 997         return 0;
 998
 999 err_init_fw:
1000         pr_debug("info: %s: unregister device\n", __func__);
1001         if (adapter->if_ops.unregister_dev)
1002                 adapter->if_ops.unregister_dev(adapter);
1003         if ((adapter->hw_status == MWIFIEX_HW_STATUS_FW_READY) ||
1004             (adapter->hw_status == MWIFIEX_HW_STATUS_READY)) {
1005                 pr_debug("info: %s: shutdown mwifiex\n", __func__);
1006                 adapter->init_wait_q_woken = false;
1007
1008                 if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
1009                         wait_event_interruptible(adapter->init_wait_q,
1010                                                  adapter->init_wait_q_woken);
1011         }
1012 err_registerdev:
1013         adapter->surprise_removed = true;
1014         mwifiex_terminate_workqueue(adapter);
1015 err_kmalloc:
1016         mwifiex_free_adapter(adapter);
1017
1018 err_init_sw:
1019         up(sem);
1020
1021 exit_sem_err:
1022         return -1;
1023 }
1024 EXPORT_SYMBOL_GPL(mwifiex_add_card);
1025
1026 /*
1027  * This function removes the card.
1028  *
1029  * This function follows the following major steps to remove the device -
1030  *      - Stop data traffic
1031  *      - Shutdown firmware
1032  *      - Remove the logical interfaces
1033  *      - Terminate the work queue
1034  *      - Unregister the device
1035  *      - Free the adapter structure
1036  */
1037 int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
1038 {
1039         struct mwifiex_private *priv = NULL;
1040         int i;
1041
1042         if (down_interruptible(sem))
1043                 goto exit_sem_err;
1044
1045         if (!adapter)
1046                 goto exit_remove;
1047
1048         /* We can no longer handle interrupts once we start doing the teardown
1049          * below. */
1050         if (adapter->if_ops.disable_int)
1051                 adapter->if_ops.disable_int(adapter);
1052
1053         adapter->surprise_removed = true;
1054
1055         /* Stop data */
1056         for (i = 0; i < adapter->priv_num; i++) {
1057                 priv = adapter->priv[i];
1058                 if (priv && priv->netdev) {
1059                         mwifiex_stop_net_dev_queue(priv->netdev, adapter);
1060                         if (netif_carrier_ok(priv->netdev))
1061                                 netif_carrier_off(priv->netdev);
1062                 }
1063         }
1064
1065         dev_dbg(adapter->dev, "cmd: calling mwifiex_shutdown_drv...\n");
1066         adapter->init_wait_q_woken = false;
1067
1068         if (mwifiex_shutdown_drv(adapter) == -EINPROGRESS)
1069                 wait_event_interruptible(adapter->init_wait_q,
1070                                          adapter->init_wait_q_woken);
1071         dev_dbg(adapter->dev, "cmd: mwifiex_shutdown_drv done\n");
1072         if (atomic_read(&adapter->rx_pending) ||
1073             atomic_read(&adapter->tx_pending) ||
1074             atomic_read(&adapter->cmd_pending)) {
1075                 dev_err(adapter->dev, "rx_pending=%d, tx_pending=%d, "
1076                        "cmd_pending=%d\n",
1077                        atomic_read(&adapter->rx_pending),
1078                        atomic_read(&adapter->tx_pending),
1079                        atomic_read(&adapter->cmd_pending));
1080         }
1081
1082         for (i = 0; i < adapter->priv_num; i++) {
1083                 priv = adapter->priv[i];
1084
1085                 if (!priv)
1086                         continue;
1087
1088                 rtnl_lock();
1089                 if (priv->wdev && priv->netdev)
1090                         mwifiex_del_virtual_intf(adapter->wiphy, priv->wdev);
1091                 rtnl_unlock();
1092         }
1093
1094         wiphy_unregister(adapter->wiphy);
1095         wiphy_free(adapter->wiphy);
1096
1097         mwifiex_terminate_workqueue(adapter);
1098
1099         /* Unregister device */
1100         dev_dbg(adapter->dev, "info: unregister device\n");
1101         if (adapter->if_ops.unregister_dev)
1102                 adapter->if_ops.unregister_dev(adapter);
1103         /* Free adapter structure */
1104         dev_dbg(adapter->dev, "info: free adapter\n");
1105         mwifiex_free_adapter(adapter);
1106
1107 exit_remove:
1108         up(sem);
1109 exit_sem_err:
1110         return 0;
1111 }
1112 EXPORT_SYMBOL_GPL(mwifiex_remove_card);
1113
1114 /*
1115  * This function initializes the module.
1116  *
1117  * The debug FS is also initialized if configured.
1118  */
1119 static int
1120 mwifiex_init_module(void)
1121 {
1122 #ifdef CONFIG_DEBUG_FS
1123         mwifiex_debugfs_init();
1124 #endif
1125         return 0;
1126 }
1127
1128 /*
1129  * This function cleans up the module.
1130  *
1131  * The debug FS is removed if available.
1132  */
1133 static void
1134 mwifiex_cleanup_module(void)
1135 {
1136 #ifdef CONFIG_DEBUG_FS
1137         mwifiex_debugfs_remove();
1138 #endif
1139 }
1140
1141 module_init(mwifiex_init_module);
1142 module_exit(mwifiex_cleanup_module);
1143
1144 MODULE_AUTHOR("Marvell International Ltd.");
1145 MODULE_DESCRIPTION("Marvell WiFi-Ex Driver version " VERSION);
1146 MODULE_VERSION(VERSION);
1147 MODULE_LICENSE("GPL v2");