drivers/net/fjes/fjes_main.c

   1 /*
   2  *  FUJITSU Extended Socket Network Device driver
   3  *  Copyright (c) 2015 FUJITSU LIMITED
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * The full GNU General Public License is included in this distribution in
  18  * the file called "COPYING".
  19  *
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/nls.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/interrupt.h>
  28
  29 #include "fjes.h"
  30
  31 #define MAJ 1
  32 #define MIN 1
  33 #define DRV_VERSION __stringify(MAJ) "." __stringify(MIN)
  34 #define DRV_NAME        "fjes"
  35 char fjes_driver_name[] = DRV_NAME;
  36 char fjes_driver_version[] = DRV_VERSION;
  37 static const char fjes_driver_string[] =
  38                 "FUJITSU Extended Socket Network Device Driver";
  39 static const char fjes_copyright[] =
  40                 "Copyright (c) 2015 FUJITSU LIMITED";
  41
  42 MODULE_AUTHOR("Taku Izumi <izumi.taku@jp.fujitsu.com>");
  43 MODULE_DESCRIPTION("FUJITSU Extended Socket Network Device Driver");
  44 MODULE_LICENSE("GPL");
  45 MODULE_VERSION(DRV_VERSION);
  46
  47 static int fjes_request_irq(struct fjes_adapter *);
  48 static void fjes_free_irq(struct fjes_adapter *);
  49
  50 static int fjes_open(struct net_device *);
  51 static int fjes_close(struct net_device *);
  52 static int fjes_setup_resources(struct fjes_adapter *);
  53 static void fjes_free_resources(struct fjes_adapter *);
  54 static netdev_tx_t fjes_xmit_frame(struct sk_buff *, struct net_device *);
  55 static void fjes_raise_intr_rxdata_task(struct work_struct *);
  56 static void fjes_tx_stall_task(struct work_struct *);
  57 static void fjes_force_close_task(struct work_struct *);
  58 static irqreturn_t fjes_intr(int, void*);
  59 static struct rtnl_link_stats64 *
  60 fjes_get_stats64(struct net_device *, struct rtnl_link_stats64 *);
  61 static int fjes_change_mtu(struct net_device *, int);
  62 static int fjes_vlan_rx_add_vid(struct net_device *, __be16 proto, u16);
  63 static int fjes_vlan_rx_kill_vid(struct net_device *, __be16 proto, u16);
  64 static void fjes_tx_retry(struct net_device *);
  65
  66 static int fjes_acpi_add(struct acpi_device *);
  67 static int fjes_acpi_remove(struct acpi_device *);
  68 static acpi_status fjes_get_acpi_resource(struct acpi_resource *, void*);
  69
  70 static int fjes_probe(struct platform_device *);
  71 static int fjes_remove(struct platform_device *);
  72
  73 static int fjes_sw_init(struct fjes_adapter *);
  74 static void fjes_netdev_setup(struct net_device *);
  75 static void fjes_irq_watch_task(struct work_struct *);
  76 static void fjes_watch_unshare_task(struct work_struct *);
  77 static void fjes_rx_irq(struct fjes_adapter *, int);
  78 static int fjes_poll(struct napi_struct *, int);
  79
  80 static const struct acpi_device_id fjes_acpi_ids[] = {
  81         {"PNP0C02", 0},
  82         {"", 0},
  83 };
  84 MODULE_DEVICE_TABLE(acpi, fjes_acpi_ids);
  85
  86 static struct acpi_driver fjes_acpi_driver = {
  87         .name = DRV_NAME,
  88         .class = DRV_NAME,
  89         .owner = THIS_MODULE,
  90         .ids = fjes_acpi_ids,
  91         .ops = {
  92                 .add = fjes_acpi_add,
  93                 .remove = fjes_acpi_remove,
  94         },
  95 };
  96
  97 static struct platform_driver fjes_driver = {
  98         .driver = {
  99                 .name = DRV_NAME,
 100         },
 101         .probe = fjes_probe,
 102         .remove = fjes_remove,
 103 };
 104
 105 static struct resource fjes_resource[] = {
 106         {
 107                 .flags = IORESOURCE_MEM,
 108                 .start = 0,
 109                 .end = 0,
 110         },
 111         {
 112                 .flags = IORESOURCE_IRQ,
 113                 .start = 0,
 114                 .end = 0,
 115         },
 116 };
 117
 118 static int fjes_acpi_add(struct acpi_device *device)
 119 {
 120         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 121         char str_buf[sizeof(FJES_ACPI_SYMBOL) + 1];
 122         struct platform_device *plat_dev;
 123         union acpi_object *str;
 124         acpi_status status;
 125         int result;
 126
 127         status = acpi_evaluate_object(device->handle, "_STR", NULL, &buffer);
 128         if (ACPI_FAILURE(status))
 129                 return -ENODEV;
 130
 131         str = buffer.pointer;
 132         result = utf16s_to_utf8s((wchar_t *)str->string.pointer,
 133                                  str->string.length, UTF16_LITTLE_ENDIAN,
 134                                  str_buf, sizeof(str_buf) - 1);
 135         str_buf[result] = 0;
 136
 137         if (strncmp(FJES_ACPI_SYMBOL, str_buf, strlen(FJES_ACPI_SYMBOL)) != 0) {
 138                 kfree(buffer.pointer);
 139                 return -ENODEV;
 140         }
 141         kfree(buffer.pointer);
 142
 143         status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
 144                                      fjes_get_acpi_resource, fjes_resource);
 145         if (ACPI_FAILURE(status))
 146                 return -ENODEV;
 147
 148         /* create platform_device */
 149         plat_dev = platform_device_register_simple(DRV_NAME, 0, fjes_resource,
 150                                                    ARRAY_SIZE(fjes_resource));
 151         if (IS_ERR(plat_dev))
 152                 return PTR_ERR(plat_dev);
 153
 154         device->driver_data = plat_dev;
 155
 156         return 0;
 157 }
 158
 159 static int fjes_acpi_remove(struct acpi_device *device)
 160 {
 161         struct platform_device *plat_dev;
 162
 163         plat_dev = (struct platform_device *)acpi_driver_data(device);
 164         platform_device_unregister(plat_dev);
 165
 166         return 0;
 167 }
 168
 169 static acpi_status
 170 fjes_get_acpi_resource(struct acpi_resource *acpi_res, void *data)
 171 {
 172         struct acpi_resource_address32 *addr;
 173         struct acpi_resource_irq *irq;
 174         struct resource *res = data;
 175
 176         switch (acpi_res->type) {
 177         case ACPI_RESOURCE_TYPE_ADDRESS32:
 178                 addr = &acpi_res->data.address32;
 179                 res[0].start = addr->address.minimum;
 180                 res[0].end = addr->address.minimum +
 181                         addr->address.address_length - 1;
 182                 break;
 183
 184         case ACPI_RESOURCE_TYPE_IRQ:
 185                 irq = &acpi_res->data.irq;
 186                 if (irq->interrupt_count != 1)
 187                         return AE_ERROR;
 188                 res[1].start = irq->interrupts[0];
 189                 res[1].end = irq->interrupts[0];
 190                 break;
 191
 192         default:
 193                 break;
 194         }
 195
 196         return AE_OK;
 197 }
 198
 199 static int fjes_request_irq(struct fjes_adapter *adapter)
 200 {
 201         struct net_device *netdev = adapter->netdev;
 202         int result = -1;
 203
 204         adapter->interrupt_watch_enable = true;
 205         if (!delayed_work_pending(&adapter->interrupt_watch_task)) {
 206                 queue_delayed_work(adapter->control_wq,
 207                                    &adapter->interrupt_watch_task,
 208                                    FJES_IRQ_WATCH_DELAY);
 209         }
 210
 211         if (!adapter->irq_registered) {
 212                 result = request_irq(adapter->hw.hw_res.irq, fjes_intr,
 213                                      IRQF_SHARED, netdev->name, adapter);
 214                 if (result)
 215                         adapter->irq_registered = false;
 216                 else
 217                         adapter->irq_registered = true;
 218         }
 219
 220         return result;
 221 }
 222
 223 static void fjes_free_irq(struct fjes_adapter *adapter)
 224 {
 225         struct fjes_hw *hw = &adapter->hw;
 226
 227         adapter->interrupt_watch_enable = false;
 228         cancel_delayed_work_sync(&adapter->interrupt_watch_task);
 229
 230         fjes_hw_set_irqmask(hw, REG_ICTL_MASK_ALL, true);
 231
 232         if (adapter->irq_registered) {
 233                 free_irq(adapter->hw.hw_res.irq, adapter);
 234                 adapter->irq_registered = false;
 235         }
 236 }
 237
 238 static const struct net_device_ops fjes_netdev_ops = {
 239         .ndo_open               = fjes_open,
 240         .ndo_stop               = fjes_close,
 241         .ndo_start_xmit         = fjes_xmit_frame,
 242         .ndo_get_stats64        = fjes_get_stats64,
 243         .ndo_change_mtu         = fjes_change_mtu,
 244         .ndo_tx_timeout         = fjes_tx_retry,
 245         .ndo_vlan_rx_add_vid    = fjes_vlan_rx_add_vid,
 246         .ndo_vlan_rx_kill_vid = fjes_vlan_rx_kill_vid,
 247 };
 248
 249 /* fjes_open - Called when a network interface is made active */
 250 static int fjes_open(struct net_device *netdev)
 251 {
 252         struct fjes_adapter *adapter = netdev_priv(netdev);
 253         struct fjes_hw *hw = &adapter->hw;
 254         int result;
 255
 256         if (adapter->open_guard)
 257                 return -ENXIO;
 258
 259         result = fjes_setup_resources(adapter);
 260         if (result)
 261                 goto err_setup_res;
 262
 263         hw->txrx_stop_req_bit = 0;
 264         hw->epstop_req_bit = 0;
 265
 266         napi_enable(&adapter->napi);
 267
 268         fjes_hw_capture_interrupt_status(hw);
 269
 270         result = fjes_request_irq(adapter);
 271         if (result)
 272                 goto err_req_irq;
 273
 274         fjes_hw_set_irqmask(hw, REG_ICTL_MASK_ALL, false);
 275
 276         netif_tx_start_all_queues(netdev);
 277         netif_carrier_on(netdev);
 278
 279         return 0;
 280
 281 err_req_irq:
 282         fjes_free_irq(adapter);
 283         napi_disable(&adapter->napi);
 284
 285 err_setup_res:
 286         fjes_free_resources(adapter);
 287         return result;
 288 }
 289
 290 /* fjes_close - Disables a network interface */
 291 static int fjes_close(struct net_device *netdev)
 292 {
 293         struct fjes_adapter *adapter = netdev_priv(netdev);
 294         struct fjes_hw *hw = &adapter->hw;
 295         unsigned long flags;
 296         int epidx;
 297
 298         netif_tx_stop_all_queues(netdev);
 299         netif_carrier_off(netdev);
 300
 301         fjes_hw_raise_epstop(hw);
 302
 303         napi_disable(&adapter->napi);
 304
 305         spin_lock_irqsave(&hw->rx_status_lock, flags);
 306         for (epidx = 0; epidx < hw->max_epid; epidx++) {
 307                 if (epidx == hw->my_epid)
 308                         continue;
 309
 310                 if (fjes_hw_get_partner_ep_status(hw, epidx) ==
 311                     EP_PARTNER_SHARED)
 312                         adapter->hw.ep_shm_info[epidx]
 313                                    .tx.info->v1i.rx_status &=
 314                                 ~FJES_RX_POLL_WORK;
 315         }
 316         spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 317
 318         fjes_free_irq(adapter);
 319
 320         cancel_delayed_work_sync(&adapter->interrupt_watch_task);
 321         cancel_work_sync(&adapter->unshare_watch_task);
 322         adapter->unshare_watch_bitmask = 0;
 323         cancel_work_sync(&adapter->raise_intr_rxdata_task);
 324         cancel_work_sync(&adapter->tx_stall_task);
 325
 326         cancel_work_sync(&hw->update_zone_task);
 327         cancel_work_sync(&hw->epstop_task);
 328
 329         fjes_hw_wait_epstop(hw);
 330
 331         fjes_free_resources(adapter);
 332
 333         return 0;
 334 }
 335
 336 static int fjes_setup_resources(struct fjes_adapter *adapter)
 337 {
 338         struct net_device *netdev = adapter->netdev;
 339         struct ep_share_mem_info *buf_pair;
 340         struct fjes_hw *hw = &adapter->hw;
 341         unsigned long flags;
 342         int result;
 343         int epidx;
 344
 345         mutex_lock(&hw->hw_info.lock);
 346         result = fjes_hw_request_info(hw);
 347         switch (result) {
 348         case 0:
 349                 for (epidx = 0; epidx < hw->max_epid; epidx++) {
 350                         hw->ep_shm_info[epidx].es_status =
 351                             hw->hw_info.res_buf->info.info[epidx].es_status;
 352                         hw->ep_shm_info[epidx].zone =
 353                             hw->hw_info.res_buf->info.info[epidx].zone;
 354                 }
 355                 break;
 356         default:
 357         case -ENOMSG:
 358         case -EBUSY:
 359                 adapter->force_reset = true;
 360
 361                 mutex_unlock(&hw->hw_info.lock);
 362                 return result;
 363         }
 364         mutex_unlock(&hw->hw_info.lock);
 365
 366         for (epidx = 0; epidx < (hw->max_epid); epidx++) {
 367                 if ((epidx != hw->my_epid) &&
 368                     (hw->ep_shm_info[epidx].es_status ==
 369                      FJES_ZONING_STATUS_ENABLE)) {
 370                         fjes_hw_raise_interrupt(hw, epidx,
 371                                                 REG_ICTL_MASK_INFO_UPDATE);
 372                 }
 373         }
 374
 375         msleep(FJES_OPEN_ZONE_UPDATE_WAIT * hw->max_epid);
 376
 377         for (epidx = 0; epidx < (hw->max_epid); epidx++) {
 378                 if (epidx == hw->my_epid)
 379                         continue;
 380
 381                 buf_pair = &hw->ep_shm_info[epidx];
 382
 383                 spin_lock_irqsave(&hw->rx_status_lock, flags);
 384                 fjes_hw_setup_epbuf(&buf_pair->tx, netdev->dev_addr,
 385                                     netdev->mtu);
 386                 spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 387
 388                 if (fjes_hw_epid_is_same_zone(hw, epidx)) {
 389                         mutex_lock(&hw->hw_info.lock);
 390                         result =
 391                         fjes_hw_register_buff_addr(hw, epidx, buf_pair);
 392                         mutex_unlock(&hw->hw_info.lock);
 393
 394                         switch (result) {
 395                         case 0:
 396                                 break;
 397                         case -ENOMSG:
 398                         case -EBUSY:
 399                         default:
 400                                 adapter->force_reset = true;
 401                                 return result;
 402                         }
 403                 }
 404         }
 405
 406         return 0;
 407 }
 408
 409 static void fjes_free_resources(struct fjes_adapter *adapter)
 410 {
 411         struct net_device *netdev = adapter->netdev;
 412         struct fjes_device_command_param param;
 413         struct ep_share_mem_info *buf_pair;
 414         struct fjes_hw *hw = &adapter->hw;
 415         bool reset_flag = false;
 416         unsigned long flags;
 417         int result;
 418         int epidx;
 419
 420         for (epidx = 0; epidx < hw->max_epid; epidx++) {
 421                 if (epidx == hw->my_epid)
 422                         continue;
 423
 424                 mutex_lock(&hw->hw_info.lock);
 425                 result = fjes_hw_unregister_buff_addr(hw, epidx);
 426                 mutex_unlock(&hw->hw_info.lock);
 427
 428                 if (result)
 429                         reset_flag = true;
 430
 431                 buf_pair = &hw->ep_shm_info[epidx];
 432
 433                 spin_lock_irqsave(&hw->rx_status_lock, flags);
 434                 fjes_hw_setup_epbuf(&buf_pair->tx,
 435                                     netdev->dev_addr, netdev->mtu);
 436                 spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 437
 438                 clear_bit(epidx, &hw->txrx_stop_req_bit);
 439         }
 440
 441         if (reset_flag || adapter->force_reset) {
 442                 result = fjes_hw_reset(hw);
 443
 444                 adapter->force_reset = false;
 445
 446                 if (result)
 447                         adapter->open_guard = true;
 448
 449                 hw->hw_info.buffer_share_bit = 0;
 450
 451                 memset((void *)&param, 0, sizeof(param));
 452
 453                 param.req_len = hw->hw_info.req_buf_size;
 454                 param.req_start = __pa(hw->hw_info.req_buf);
 455                 param.res_len = hw->hw_info.res_buf_size;
 456                 param.res_start = __pa(hw->hw_info.res_buf);
 457                 param.share_start = __pa(hw->hw_info.share->ep_status);
 458
 459                 fjes_hw_init_command_registers(hw, &param);
 460         }
 461 }
 462
 463 static void fjes_tx_stall_task(struct work_struct *work)
 464 {
 465         struct fjes_adapter *adapter = container_of(work,
 466                         struct fjes_adapter, tx_stall_task);
 467         struct net_device *netdev = adapter->netdev;
 468         struct fjes_hw *hw = &adapter->hw;
 469         int all_queue_available, sendable;
 470         enum ep_partner_status pstatus;
 471         int max_epid, my_epid, epid;
 472         union ep_buffer_info *info;
 473         int i;
 474
 475         if (((long)jiffies -
 476                 dev_trans_start(netdev)) > FJES_TX_TX_STALL_TIMEOUT) {
 477                 netif_wake_queue(netdev);
 478                 return;
 479         }
 480
 481         my_epid = hw->my_epid;
 482         max_epid = hw->max_epid;
 483
 484         for (i = 0; i < 5; i++) {
 485                 all_queue_available = 1;
 486
 487                 for (epid = 0; epid < max_epid; epid++) {
 488                         if (my_epid == epid)
 489                                 continue;
 490
 491                         pstatus = fjes_hw_get_partner_ep_status(hw, epid);
 492                         sendable = (pstatus == EP_PARTNER_SHARED);
 493                         if (!sendable)
 494                                 continue;
 495
 496                         info = adapter->hw.ep_shm_info[epid].tx.info;
 497
 498                         if (!(info->v1i.rx_status & FJES_RX_MTU_CHANGING_DONE))
 499                                 return;
 500
 501                         if (EP_RING_FULL(info->v1i.head, info->v1i.tail,
 502                                          info->v1i.count_max)) {
 503                                 all_queue_available = 0;
 504                                 break;
 505                         }
 506                 }
 507
 508                 if (all_queue_available) {
 509                         netif_wake_queue(netdev);
 510                         return;
 511                 }
 512         }
 513
 514         usleep_range(50, 100);
 515
 516         queue_work(adapter->txrx_wq, &adapter->tx_stall_task);
 517 }
 518
 519 static void fjes_force_close_task(struct work_struct *work)
 520 {
 521         struct fjes_adapter *adapter = container_of(work,
 522                         struct fjes_adapter, force_close_task);
 523         struct net_device *netdev = adapter->netdev;
 524
 525         rtnl_lock();
 526         dev_close(netdev);
 527         rtnl_unlock();
 528 }
 529
 530 static void fjes_raise_intr_rxdata_task(struct work_struct *work)
 531 {
 532         struct fjes_adapter *adapter = container_of(work,
 533                         struct fjes_adapter, raise_intr_rxdata_task);
 534         struct fjes_hw *hw = &adapter->hw;
 535         enum ep_partner_status pstatus;
 536         int max_epid, my_epid, epid;
 537
 538         my_epid = hw->my_epid;
 539         max_epid = hw->max_epid;
 540
 541         for (epid = 0; epid < max_epid; epid++)
 542                 hw->ep_shm_info[epid].tx_status_work = 0;
 543
 544         for (epid = 0; epid < max_epid; epid++) {
 545                 if (epid == my_epid)
 546                         continue;
 547
 548                 pstatus = fjes_hw_get_partner_ep_status(hw, epid);
 549                 if (pstatus == EP_PARTNER_SHARED) {
 550                         hw->ep_shm_info[epid].tx_status_work =
 551                                 hw->ep_shm_info[epid].tx.info->v1i.tx_status;
 552
 553                         if (hw->ep_shm_info[epid].tx_status_work ==
 554                                 FJES_TX_DELAY_SEND_PENDING) {
 555                                 hw->ep_shm_info[epid].tx.info->v1i.tx_status =
 556                                         FJES_TX_DELAY_SEND_NONE;
 557                         }
 558                 }
 559         }
 560
 561         for (epid = 0; epid < max_epid; epid++) {
 562                 if (epid == my_epid)
 563                         continue;
 564
 565                 pstatus = fjes_hw_get_partner_ep_status(hw, epid);
 566                 if ((hw->ep_shm_info[epid].tx_status_work ==
 567                      FJES_TX_DELAY_SEND_PENDING) &&
 568                     (pstatus == EP_PARTNER_SHARED) &&
 569                     !(hw->ep_shm_info[epid].rx.info->v1i.rx_status &
 570                       FJES_RX_POLL_WORK)) {
 571                         fjes_hw_raise_interrupt(hw, epid,
 572                                                 REG_ICTL_MASK_RX_DATA);
 573                 }
 574         }
 575
 576         usleep_range(500, 1000);
 577 }
 578
 579 static int fjes_tx_send(struct fjes_adapter *adapter, int dest,
 580                         void *data, size_t len)
 581 {
 582         int retval;
 583
 584         retval = fjes_hw_epbuf_tx_pkt_send(&adapter->hw.ep_shm_info[dest].tx,
 585                                            data, len);
 586         if (retval)
 587                 return retval;
 588
 589         adapter->hw.ep_shm_info[dest].tx.info->v1i.tx_status =
 590                 FJES_TX_DELAY_SEND_PENDING;
 591         if (!work_pending(&adapter->raise_intr_rxdata_task))
 592                 queue_work(adapter->txrx_wq,
 593                            &adapter->raise_intr_rxdata_task);
 594
 595         retval = 0;
 596         return retval;
 597 }
 598
 599 static netdev_tx_t
 600 fjes_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 601 {
 602         struct fjes_adapter *adapter = netdev_priv(netdev);
 603         struct fjes_hw *hw = &adapter->hw;
 604
 605         int max_epid, my_epid, dest_epid;
 606         enum ep_partner_status pstatus;
 607         struct netdev_queue *cur_queue;
 608         char shortpkt[VLAN_ETH_HLEN];
 609         bool is_multi, vlan;
 610         struct ethhdr *eth;
 611         u16 queue_no = 0;
 612         u16 vlan_id = 0;
 613         netdev_tx_t ret;
 614         char *data;
 615         int len;
 616
 617         ret = NETDEV_TX_OK;
 618         is_multi = false;
 619         cur_queue = netdev_get_tx_queue(netdev, queue_no);
 620
 621         eth = (struct ethhdr *)skb->data;
 622         my_epid = hw->my_epid;
 623
 624         vlan = (vlan_get_tag(skb, &vlan_id) == 0) ? true : false;
 625
 626         data = skb->data;
 627         len = skb->len;
 628
 629         if (is_multicast_ether_addr(eth->h_dest)) {
 630                 dest_epid = 0;
 631                 max_epid = hw->max_epid;
 632                 is_multi = true;
 633         } else if (is_local_ether_addr(eth->h_dest)) {
 634                 dest_epid = eth->h_dest[ETH_ALEN - 1];
 635                 max_epid = dest_epid + 1;
 636
 637                 if ((eth->h_dest[0] == 0x02) &&
 638                     (0x00 == (eth->h_dest[1] | eth->h_dest[2] |
 639                               eth->h_dest[3] | eth->h_dest[4])) &&
 640                     (dest_epid < hw->max_epid)) {
 641                         ;
 642                 } else {
 643                         dest_epid = 0;
 644                         max_epid = 0;
 645                         ret = NETDEV_TX_OK;
 646
 647                         adapter->stats64.tx_packets += 1;
 648                         hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
 649                         adapter->stats64.tx_bytes += len;
 650                         hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
 651                 }
 652         } else {
 653                 dest_epid = 0;
 654                 max_epid = 0;
 655                 ret = NETDEV_TX_OK;
 656
 657                 adapter->stats64.tx_packets += 1;
 658                 hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
 659                 adapter->stats64.tx_bytes += len;
 660                 hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
 661         }
 662
 663         for (; dest_epid < max_epid; dest_epid++) {
 664                 if (my_epid == dest_epid)
 665                         continue;
 666
 667                 pstatus = fjes_hw_get_partner_ep_status(hw, dest_epid);
 668                 if (pstatus != EP_PARTNER_SHARED) {
 669                         ret = NETDEV_TX_OK;
 670                 } else if (!fjes_hw_check_epbuf_version(
 671                                 &adapter->hw.ep_shm_info[dest_epid].rx, 0)) {
 672                         /* version is NOT 0 */
 673                         adapter->stats64.tx_carrier_errors += 1;
 674                         hw->ep_shm_info[dest_epid].net_stats
 675                                                 .tx_carrier_errors += 1;
 676
 677                         ret = NETDEV_TX_OK;
 678                 } else if (!fjes_hw_check_mtu(
 679                                 &adapter->hw.ep_shm_info[dest_epid].rx,
 680                                 netdev->mtu)) {
 681                         adapter->stats64.tx_dropped += 1;
 682                         hw->ep_shm_info[dest_epid].net_stats.tx_dropped += 1;
 683                         adapter->stats64.tx_errors += 1;
 684                         hw->ep_shm_info[dest_epid].net_stats.tx_errors += 1;
 685
 686                         ret = NETDEV_TX_OK;
 687                 } else if (vlan &&
 688                            !fjes_hw_check_vlan_id(
 689                                 &adapter->hw.ep_shm_info[dest_epid].rx,
 690                                 vlan_id)) {
 691                         ret = NETDEV_TX_OK;
 692                 } else {
 693                         if (len < VLAN_ETH_HLEN) {
 694                                 memset(shortpkt, 0, VLAN_ETH_HLEN);
 695                                 memcpy(shortpkt, skb->data, skb->len);
 696                                 len = VLAN_ETH_HLEN;
 697                                 data = shortpkt;
 698                         }
 699
 700                         if (adapter->tx_retry_count == 0) {
 701                                 adapter->tx_start_jiffies = jiffies;
 702                                 adapter->tx_retry_count = 1;
 703                         } else {
 704                                 adapter->tx_retry_count++;
 705                         }
 706
 707                         if (fjes_tx_send(adapter, dest_epid, data, len)) {
 708                                 if (is_multi) {
 709                                         ret = NETDEV_TX_OK;
 710                                 } else if (
 711                                            ((long)jiffies -
 712                                             (long)adapter->tx_start_jiffies) >=
 713                                             FJES_TX_RETRY_TIMEOUT) {
 714                                         adapter->stats64.tx_fifo_errors += 1;
 715                                         hw->ep_shm_info[dest_epid].net_stats
 716                                                                 .tx_fifo_errors += 1;
 717                                         adapter->stats64.tx_errors += 1;
 718                                         hw->ep_shm_info[dest_epid].net_stats
 719                                                                 .tx_errors += 1;
 720
 721                                         ret = NETDEV_TX_OK;
 722                                 } else {
 723                                         netif_trans_update(netdev);
 724                                         netif_tx_stop_queue(cur_queue);
 725
 726                                         if (!work_pending(&adapter->tx_stall_task))
 727                                                 queue_work(adapter->txrx_wq,
 728                                                            &adapter->tx_stall_task);
 729
 730                                         ret = NETDEV_TX_BUSY;
 731                                 }
 732                         } else {
 733                                 if (!is_multi) {
 734                                         adapter->stats64.tx_packets += 1;
 735                                         hw->ep_shm_info[dest_epid].net_stats
 736                                                                 .tx_packets += 1;
 737                                         adapter->stats64.tx_bytes += len;
 738                                         hw->ep_shm_info[dest_epid].net_stats
 739                                                                 .tx_bytes += len;
 740                                 }
 741
 742                                 adapter->tx_retry_count = 0;
 743                                 ret = NETDEV_TX_OK;
 744                         }
 745                 }
 746         }
 747
 748         if (ret == NETDEV_TX_OK) {
 749                 dev_kfree_skb(skb);
 750                 if (is_multi) {
 751                         adapter->stats64.tx_packets += 1;
 752                         hw->ep_shm_info[my_epid].net_stats.tx_packets += 1;
 753                         adapter->stats64.tx_bytes += 1;
 754                         hw->ep_shm_info[my_epid].net_stats.tx_bytes += len;
 755                 }
 756         }
 757
 758         return ret;
 759 }
 760
 761 static void fjes_tx_retry(struct net_device *netdev)
 762 {
 763         struct netdev_queue *queue = netdev_get_tx_queue(netdev, 0);
 764
 765         netif_tx_wake_queue(queue);
 766 }
 767
 768 static struct rtnl_link_stats64 *
 769 fjes_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 770 {
 771         struct fjes_adapter *adapter = netdev_priv(netdev);
 772
 773         memcpy(stats, &adapter->stats64, sizeof(struct rtnl_link_stats64));
 774
 775         return stats;
 776 }
 777
 778 static int fjes_change_mtu(struct net_device *netdev, int new_mtu)
 779 {
 780         struct fjes_adapter *adapter = netdev_priv(netdev);
 781         bool running = netif_running(netdev);
 782         struct fjes_hw *hw = &adapter->hw;
 783         unsigned long flags;
 784         int ret = -EINVAL;
 785         int idx, epidx;
 786
 787         for (idx = 0; fjes_support_mtu[idx] != 0; idx++) {
 788                 if (new_mtu <= fjes_support_mtu[idx]) {
 789                         new_mtu = fjes_support_mtu[idx];
 790                         if (new_mtu == netdev->mtu)
 791                                 return 0;
 792
 793                         ret = 0;
 794                         break;
 795                 }
 796         }
 797
 798         if (ret)
 799                 return ret;
 800
 801         if (running) {
 802                 spin_lock_irqsave(&hw->rx_status_lock, flags);
 803                 for (epidx = 0; epidx < hw->max_epid; epidx++) {
 804                         if (epidx == hw->my_epid)
 805                                 continue;
 806                         hw->ep_shm_info[epidx].tx.info->v1i.rx_status &=
 807                                 ~FJES_RX_MTU_CHANGING_DONE;
 808                 }
 809                 spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 810
 811                 netif_tx_stop_all_queues(netdev);
 812                 netif_carrier_off(netdev);
 813                 cancel_work_sync(&adapter->tx_stall_task);
 814                 napi_disable(&adapter->napi);
 815
 816                 msleep(1000);
 817
 818                 netif_tx_stop_all_queues(netdev);
 819         }
 820
 821         netdev->mtu = new_mtu;
 822
 823         if (running) {
 824                 for (epidx = 0; epidx < hw->max_epid; epidx++) {
 825                         if (epidx == hw->my_epid)
 826                                 continue;
 827
 828                         spin_lock_irqsave(&hw->rx_status_lock, flags);
 829                         fjes_hw_setup_epbuf(&hw->ep_shm_info[epidx].tx,
 830                                             netdev->dev_addr,
 831                                             netdev->mtu);
 832
 833                         hw->ep_shm_info[epidx].tx.info->v1i.rx_status |=
 834                                 FJES_RX_MTU_CHANGING_DONE;
 835                         spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 836                 }
 837
 838                 netif_tx_wake_all_queues(netdev);
 839                 netif_carrier_on(netdev);
 840                 napi_enable(&adapter->napi);
 841                 napi_schedule(&adapter->napi);
 842         }
 843
 844         return ret;
 845 }
 846
 847 static int fjes_vlan_rx_add_vid(struct net_device *netdev,
 848                                 __be16 proto, u16 vid)
 849 {
 850         struct fjes_adapter *adapter = netdev_priv(netdev);
 851         bool ret = true;
 852         int epid;
 853
 854         for (epid = 0; epid < adapter->hw.max_epid; epid++) {
 855                 if (epid == adapter->hw.my_epid)
 856                         continue;
 857
 858                 if (!fjes_hw_check_vlan_id(
 859                         &adapter->hw.ep_shm_info[epid].tx, vid))
 860                         ret = fjes_hw_set_vlan_id(
 861                                 &adapter->hw.ep_shm_info[epid].tx, vid);
 862         }
 863
 864         return ret ? 0 : -ENOSPC;
 865 }
 866
 867 static int fjes_vlan_rx_kill_vid(struct net_device *netdev,
 868                                  __be16 proto, u16 vid)
 869 {
 870         struct fjes_adapter *adapter = netdev_priv(netdev);
 871         int epid;
 872
 873         for (epid = 0; epid < adapter->hw.max_epid; epid++) {
 874                 if (epid == adapter->hw.my_epid)
 875                         continue;
 876
 877                 fjes_hw_del_vlan_id(&adapter->hw.ep_shm_info[epid].tx, vid);
 878         }
 879
 880         return 0;
 881 }
 882
 883 static void fjes_txrx_stop_req_irq(struct fjes_adapter *adapter,
 884                                    int src_epid)
 885 {
 886         struct fjes_hw *hw = &adapter->hw;
 887         enum ep_partner_status status;
 888         unsigned long flags;
 889
 890         status = fjes_hw_get_partner_ep_status(hw, src_epid);
 891         switch (status) {
 892         case EP_PARTNER_UNSHARE:
 893         case EP_PARTNER_COMPLETE:
 894         default:
 895                 break;
 896         case EP_PARTNER_WAITING:
 897                 if (src_epid < hw->my_epid) {
 898                         spin_lock_irqsave(&hw->rx_status_lock, flags);
 899                         hw->ep_shm_info[src_epid].tx.info->v1i.rx_status |=
 900                                 FJES_RX_STOP_REQ_DONE;
 901                         spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 902
 903                         clear_bit(src_epid, &hw->txrx_stop_req_bit);
 904                         set_bit(src_epid, &adapter->unshare_watch_bitmask);
 905
 906                         if (!work_pending(&adapter->unshare_watch_task))
 907                                 queue_work(adapter->control_wq,
 908                                            &adapter->unshare_watch_task);
 909                 }
 910                 break;
 911         case EP_PARTNER_SHARED:
 912                 if (hw->ep_shm_info[src_epid].rx.info->v1i.rx_status &
 913                     FJES_RX_STOP_REQ_REQUEST) {
 914                         set_bit(src_epid, &hw->epstop_req_bit);
 915                         if (!work_pending(&hw->epstop_task))
 916                                 queue_work(adapter->control_wq,
 917                                            &hw->epstop_task);
 918                 }
 919                 break;
 920         }
 921 }
 922
 923 static void fjes_stop_req_irq(struct fjes_adapter *adapter, int src_epid)
 924 {
 925         struct fjes_hw *hw = &adapter->hw;
 926         enum ep_partner_status status;
 927         unsigned long flags;
 928
 929         set_bit(src_epid, &hw->hw_info.buffer_unshare_reserve_bit);
 930
 931         status = fjes_hw_get_partner_ep_status(hw, src_epid);
 932         switch (status) {
 933         case EP_PARTNER_WAITING:
 934                 spin_lock_irqsave(&hw->rx_status_lock, flags);
 935                 hw->ep_shm_info[src_epid].tx.info->v1i.rx_status |=
 936                                 FJES_RX_STOP_REQ_DONE;
 937                 spin_unlock_irqrestore(&hw->rx_status_lock, flags);
 938                 clear_bit(src_epid, &hw->txrx_stop_req_bit);
 939                 /* fall through */
 940         case EP_PARTNER_UNSHARE:
 941         case EP_PARTNER_COMPLETE:
 942         default:
 943                 set_bit(src_epid, &adapter->unshare_watch_bitmask);
 944                 if (!work_pending(&adapter->unshare_watch_task))
 945                         queue_work(adapter->control_wq,
 946                                    &adapter->unshare_watch_task);
 947                 break;
 948         case EP_PARTNER_SHARED:
 949                 set_bit(src_epid, &hw->epstop_req_bit);
 950
 951                 if (!work_pending(&hw->epstop_task))
 952                         queue_work(adapter->control_wq, &hw->epstop_task);
 953                 break;
 954         }
 955 }
 956
 957 static void fjes_update_zone_irq(struct fjes_adapter *adapter,
 958                                  int src_epid)
 959 {
 960         struct fjes_hw *hw = &adapter->hw;
 961
 962         if (!work_pending(&hw->update_zone_task))
 963                 queue_work(adapter->control_wq, &hw->update_zone_task);
 964 }
 965
 966 static irqreturn_t fjes_intr(int irq, void *data)
 967 {
 968         struct fjes_adapter *adapter = data;
 969         struct fjes_hw *hw = &adapter->hw;
 970         irqreturn_t ret;
 971         u32 icr;
 972
 973         icr = fjes_hw_capture_interrupt_status(hw);
 974
 975         if (icr & REG_IS_MASK_IS_ASSERT) {
 976                 if (icr & REG_ICTL_MASK_RX_DATA)
 977                         fjes_rx_irq(adapter, icr & REG_IS_MASK_EPID);
 978
 979                 if (icr & REG_ICTL_MASK_DEV_STOP_REQ)
 980                         fjes_stop_req_irq(adapter, icr & REG_IS_MASK_EPID);
 981
 982                 if (icr & REG_ICTL_MASK_TXRX_STOP_REQ)
 983                         fjes_txrx_stop_req_irq(adapter, icr & REG_IS_MASK_EPID);
 984
 985                 if (icr & REG_ICTL_MASK_TXRX_STOP_DONE)
 986                         fjes_hw_set_irqmask(hw,
 987                                             REG_ICTL_MASK_TXRX_STOP_DONE, true);
 988
 989                 if (icr & REG_ICTL_MASK_INFO_UPDATE)
 990                         fjes_update_zone_irq(adapter, icr & REG_IS_MASK_EPID);
 991
 992                 ret = IRQ_HANDLED;
 993         } else {
 994                 ret = IRQ_NONE;
 995         }
 996
 997         return ret;
 998 }
 999
1000 static int fjes_rxframe_search_exist(struct fjes_adapter *adapter,
1001                                      int start_epid)
1002 {
1003         struct fjes_hw *hw = &adapter->hw;
1004         enum ep_partner_status pstatus;
1005         int max_epid, cur_epid;
1006         int i;
1007
1008         max_epid = hw->max_epid;
1009         start_epid = (start_epid + 1 + max_epid) % max_epid;
1010
1011         for (i = 0; i < max_epid; i++) {
1012                 cur_epid = (start_epid + i) % max_epid;
1013                 if (cur_epid == hw->my_epid)
1014                         continue;
1015
1016                 pstatus = fjes_hw_get_partner_ep_status(hw, cur_epid);
1017                 if (pstatus == EP_PARTNER_SHARED) {
1018                         if (!fjes_hw_epbuf_rx_is_empty(
1019                                 &hw->ep_shm_info[cur_epid].rx))
1020                                 return cur_epid;
1021                 }
1022         }
1023         return -1;
1024 }
1025
1026 static void *fjes_rxframe_get(struct fjes_adapter *adapter, size_t *psize,
1027                               int *cur_epid)
1028 {
1029         void *frame;
1030
1031         *cur_epid = fjes_rxframe_search_exist(adapter, *cur_epid);
1032         if (*cur_epid < 0)
1033                 return NULL;
1034
1035         frame =
1036         fjes_hw_epbuf_rx_curpkt_get_addr(
1037                 &adapter->hw.ep_shm_info[*cur_epid].rx, psize);
1038
1039         return frame;
1040 }
1041
1042 static void fjes_rxframe_release(struct fjes_adapter *adapter, int cur_epid)
1043 {
1044         fjes_hw_epbuf_rx_curpkt_drop(&adapter->hw.ep_shm_info[cur_epid].rx);
1045 }
1046
1047 static void fjes_rx_irq(struct fjes_adapter *adapter, int src_epid)
1048 {
1049         struct fjes_hw *hw = &adapter->hw;
1050
1051         fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, true);
1052
1053         adapter->unset_rx_last = true;
1054         napi_schedule(&adapter->napi);
1055 }
1056
1057 static int fjes_poll(struct napi_struct *napi, int budget)
1058 {
1059         struct fjes_adapter *adapter =
1060                         container_of(napi, struct fjes_adapter, napi);
1061         struct net_device *netdev = napi->dev;
1062         struct fjes_hw *hw = &adapter->hw;
1063         struct sk_buff *skb;
1064         int work_done = 0;
1065         int cur_epid = 0;
1066         int epidx;
1067         size_t frame_len;
1068         void *frame;
1069
1070         spin_lock(&hw->rx_status_lock);
1071         for (epidx = 0; epidx < hw->max_epid; epidx++) {
1072                 if (epidx == hw->my_epid)
1073                         continue;
1074
1075                 if (fjes_hw_get_partner_ep_status(hw, epidx) ==
1076                     EP_PARTNER_SHARED)
1077                         adapter->hw.ep_shm_info[epidx]
1078                                    .tx.info->v1i.rx_status |= FJES_RX_POLL_WORK;
1079         }
1080         spin_unlock(&hw->rx_status_lock);
1081
1082         while (work_done < budget) {
1083                 prefetch(&adapter->hw);
1084                 frame = fjes_rxframe_get(adapter, &frame_len, &cur_epid);
1085
1086                 if (frame) {
1087                         skb = napi_alloc_skb(napi, frame_len);
1088                         if (!skb) {
1089                                 adapter->stats64.rx_dropped += 1;
1090                                 hw->ep_shm_info[cur_epid].net_stats
1091                                                          .rx_dropped += 1;
1092                                 adapter->stats64.rx_errors += 1;
1093                                 hw->ep_shm_info[cur_epid].net_stats
1094                                                          .rx_errors += 1;
1095                         } else {
1096                                 memcpy(skb_put(skb, frame_len),
1097                                        frame, frame_len);
1098                                 skb->protocol = eth_type_trans(skb, netdev);
1099                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1100
1101                                 netif_receive_skb(skb);
1102
1103                                 work_done++;
1104
1105                                 adapter->stats64.rx_packets += 1;
1106                                 hw->ep_shm_info[cur_epid].net_stats
1107                                                          .rx_packets += 1;
1108                                 adapter->stats64.rx_bytes += frame_len;
1109                                 hw->ep_shm_info[cur_epid].net_stats
1110                                                          .rx_bytes += frame_len;
1111
1112                                 if (is_multicast_ether_addr(
1113                                         ((struct ethhdr *)frame)->h_dest)) {
1114                                         adapter->stats64.multicast += 1;
1115                                         hw->ep_shm_info[cur_epid].net_stats
1116                                                                  .multicast += 1;
1117                                 }
1118                         }
1119
1120                         fjes_rxframe_release(adapter, cur_epid);
1121                         adapter->unset_rx_last = true;
1122                 } else {
1123                         break;
1124                 }
1125         }
1126
1127         if (work_done < budget) {
1128                 napi_complete(napi);
1129
1130                 if (adapter->unset_rx_last) {
1131                         adapter->rx_last_jiffies = jiffies;
1132                         adapter->unset_rx_last = false;
1133                 }
1134
1135                 if (((long)jiffies - (long)adapter->rx_last_jiffies) < 3) {
1136                         napi_reschedule(napi);
1137                 } else {
1138                         spin_lock(&hw->rx_status_lock);
1139                         for (epidx = 0; epidx < hw->max_epid; epidx++) {
1140                                 if (epidx == hw->my_epid)
1141                                         continue;
1142                                 if (fjes_hw_get_partner_ep_status(hw, epidx) ==
1143                                     EP_PARTNER_SHARED)
1144                                         adapter->hw.ep_shm_info[epidx].tx
1145                                                    .info->v1i.rx_status &=
1146                                                 ~FJES_RX_POLL_WORK;
1147                         }
1148                         spin_unlock(&hw->rx_status_lock);
1149
1150                         fjes_hw_set_irqmask(hw, REG_ICTL_MASK_RX_DATA, false);
1151                 }
1152         }
1153
1154         return work_done;
1155 }
1156
1157 /* fjes_probe - Device Initialization Routine */
1158 static int fjes_probe(struct platform_device *plat_dev)
1159 {
1160         struct fjes_adapter *adapter;
1161         struct net_device *netdev;
1162         struct resource *res;
1163         struct fjes_hw *hw;
1164         int err;
1165
1166         err = -ENOMEM;
1167         netdev = alloc_netdev_mq(sizeof(struct fjes_adapter), "es%d",
1168                                  NET_NAME_UNKNOWN, fjes_netdev_setup,
1169                                  FJES_MAX_QUEUES);
1170
1171         if (!netdev)
1172                 goto err_out;
1173
1174         SET_NETDEV_DEV(netdev, &plat_dev->dev);
1175
1176         dev_set_drvdata(&plat_dev->dev, netdev);
1177         adapter = netdev_priv(netdev);
1178         adapter->netdev = netdev;
1179         adapter->plat_dev = plat_dev;
1180         hw = &adapter->hw;
1181         hw->back = adapter;
1182
1183         /* setup the private structure */
1184         err = fjes_sw_init(adapter);
1185         if (err)
1186                 goto err_free_netdev;
1187
1188         INIT_WORK(&adapter->force_close_task, fjes_force_close_task);
1189         adapter->force_reset = false;
1190         adapter->open_guard = false;
1191
1192         adapter->txrx_wq = alloc_workqueue(DRV_NAME "/txrx", WQ_MEM_RECLAIM, 0);
1193         if (unlikely(!adapter->txrx_wq)) {
1194                 err = -ENOMEM;
1195                 goto err_free_netdev;
1196         }
1197
1198         adapter->control_wq = alloc_workqueue(DRV_NAME "/control",
1199                                               WQ_MEM_RECLAIM, 0);
1200         if (unlikely(!adapter->control_wq)) {
1201                 err = -ENOMEM;
1202                 goto err_free_txrx_wq;
1203         }
1204
1205         INIT_WORK(&adapter->tx_stall_task, fjes_tx_stall_task);
1206         INIT_WORK(&adapter->raise_intr_rxdata_task,
1207                   fjes_raise_intr_rxdata_task);
1208         INIT_WORK(&adapter->unshare_watch_task, fjes_watch_unshare_task);
1209         adapter->unshare_watch_bitmask = 0;
1210
1211         INIT_DELAYED_WORK(&adapter->interrupt_watch_task, fjes_irq_watch_task);
1212         adapter->interrupt_watch_enable = false;
1213
1214         res = platform_get_resource(plat_dev, IORESOURCE_MEM, 0);
1215         if (!res) {
1216                 err = -EINVAL;
1217                 goto err_free_control_wq;
1218         }
1219         hw->hw_res.start = res->start;
1220         hw->hw_res.size = resource_size(res);
1221         hw->hw_res.irq = platform_get_irq(plat_dev, 0);
1222         if (hw->hw_res.irq < 0) {
1223                 err = hw->hw_res.irq;
1224                 goto err_free_control_wq;
1225         }
1226
1227         err = fjes_hw_init(&adapter->hw);
1228         if (err)
1229                 goto err_free_control_wq;
1230
1231         /* setup MAC address (02:00:00:00:00:[epid])*/
1232         netdev->dev_addr[0] = 2;
1233         netdev->dev_addr[1] = 0;
1234         netdev->dev_addr[2] = 0;
1235         netdev->dev_addr[3] = 0;
1236         netdev->dev_addr[4] = 0;
1237         netdev->dev_addr[5] = hw->my_epid; /* EPID */
1238
1239         err = register_netdev(netdev);
1240         if (err)
1241                 goto err_hw_exit;
1242
1243         netif_carrier_off(netdev);
1244
1245         return 0;
1246
1247 err_hw_exit:
1248         fjes_hw_exit(&adapter->hw);
1249 err_free_control_wq:
1250         destroy_workqueue(adapter->control_wq);
1251 err_free_txrx_wq:
1252         destroy_workqueue(adapter->txrx_wq);
1253 err_free_netdev:
1254         free_netdev(netdev);
1255 err_out:
1256         return err;
1257 }
1258
1259 /* fjes_remove - Device Removal Routine */
1260 static int fjes_remove(struct platform_device *plat_dev)
1261 {
1262         struct net_device *netdev = dev_get_drvdata(&plat_dev->dev);
1263         struct fjes_adapter *adapter = netdev_priv(netdev);
1264         struct fjes_hw *hw = &adapter->hw;
1265
1266         cancel_delayed_work_sync(&adapter->interrupt_watch_task);
1267         cancel_work_sync(&adapter->unshare_watch_task);
1268         cancel_work_sync(&adapter->raise_intr_rxdata_task);
1269         cancel_work_sync(&adapter->tx_stall_task);
1270         if (adapter->control_wq)
1271                 destroy_workqueue(adapter->control_wq);
1272         if (adapter->txrx_wq)
1273                 destroy_workqueue(adapter->txrx_wq);
1274
1275         unregister_netdev(netdev);
1276
1277         fjes_hw_exit(hw);
1278
1279         netif_napi_del(&adapter->napi);
1280
1281         free_netdev(netdev);
1282
1283         return 0;
1284 }
1285
1286 static int fjes_sw_init(struct fjes_adapter *adapter)
1287 {
1288         struct net_device *netdev = adapter->netdev;
1289
1290         netif_napi_add(netdev, &adapter->napi, fjes_poll, 64);
1291
1292         return 0;
1293 }
1294
1295 /* fjes_netdev_setup - netdevice initialization routine */
1296 static void fjes_netdev_setup(struct net_device *netdev)
1297 {
1298         ether_setup(netdev);
1299
1300         netdev->watchdog_timeo = FJES_TX_RETRY_INTERVAL;
1301         netdev->netdev_ops = &fjes_netdev_ops;
1302         fjes_set_ethtool_ops(netdev);
1303         netdev->mtu = fjes_support_mtu[3];
1304         netdev->flags |= IFF_BROADCAST;
1305         netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1306 }
1307
1308 static void fjes_irq_watch_task(struct work_struct *work)
1309 {
1310         struct fjes_adapter *adapter = container_of(to_delayed_work(work),
1311                         struct fjes_adapter, interrupt_watch_task);
1312
1313         local_irq_disable();
1314         fjes_intr(adapter->hw.hw_res.irq, adapter);
1315         local_irq_enable();
1316
1317         if (fjes_rxframe_search_exist(adapter, 0) >= 0)
1318                 napi_schedule(&adapter->napi);
1319
1320         if (adapter->interrupt_watch_enable) {
1321                 if (!delayed_work_pending(&adapter->interrupt_watch_task))
1322                         queue_delayed_work(adapter->control_wq,
1323                                            &adapter->interrupt_watch_task,
1324                                            FJES_IRQ_WATCH_DELAY);
1325         }
1326 }
1327
1328 static void fjes_watch_unshare_task(struct work_struct *work)
1329 {
1330         struct fjes_adapter *adapter =
1331         container_of(work, struct fjes_adapter, unshare_watch_task);
1332
1333         struct net_device *netdev = adapter->netdev;
1334         struct fjes_hw *hw = &adapter->hw;
1335
1336         int unshare_watch, unshare_reserve;
1337         int max_epid, my_epid, epidx;
1338         int stop_req, stop_req_done;
1339         ulong unshare_watch_bitmask;
1340         unsigned long flags;
1341         int wait_time = 0;
1342         int is_shared;
1343         int ret;
1344
1345         my_epid = hw->my_epid;
1346         max_epid = hw->max_epid;
1347
1348         unshare_watch_bitmask = adapter->unshare_watch_bitmask;
1349         adapter->unshare_watch_bitmask = 0;
1350
1351         while ((unshare_watch_bitmask || hw->txrx_stop_req_bit) &&
1352                (wait_time < 3000)) {
1353                 for (epidx = 0; epidx < hw->max_epid; epidx++) {
1354                         if (epidx == hw->my_epid)
1355                                 continue;
1356
1357                         is_shared = fjes_hw_epid_is_shared(hw->hw_info.share,
1358                                                            epidx);
1359
1360                         stop_req = test_bit(epidx, &hw->txrx_stop_req_bit);
1361
1362                         stop_req_done = hw->ep_shm_info[epidx].rx.info->v1i.rx_status &
1363                                         FJES_RX_STOP_REQ_DONE;
1364
1365                         unshare_watch = test_bit(epidx, &unshare_watch_bitmask);
1366
1367                         unshare_reserve = test_bit(epidx,
1368                                                    &hw->hw_info.buffer_unshare_reserve_bit);
1369
1370                         if ((!stop_req ||
1371                              (is_shared && (!is_shared || !stop_req_done))) &&
1372                             (is_shared || !unshare_watch || !unshare_reserve))
1373                                 continue;
1374
1375                         mutex_lock(&hw->hw_info.lock);
1376                         ret = fjes_hw_unregister_buff_addr(hw, epidx);
1377                         switch (ret) {
1378                         case 0:
1379                                 break;
1380                         case -ENOMSG:
1381                         case -EBUSY:
1382                         default:
1383                                 if (!work_pending(
1384                                         &adapter->force_close_task)) {
1385                                         adapter->force_reset = true;
1386                                         schedule_work(
1387                                                 &adapter->force_close_task);
1388                                 }
1389                                 break;
1390                         }
1391                         mutex_unlock(&hw->hw_info.lock);
1392
1393                         spin_lock_irqsave(&hw->rx_status_lock, flags);
1394                         fjes_hw_setup_epbuf(&hw->ep_shm_info[epidx].tx,
1395                                             netdev->dev_addr, netdev->mtu);
1396                         spin_unlock_irqrestore(&hw->rx_status_lock, flags);
1397
1398                         clear_bit(epidx, &hw->txrx_stop_req_bit);
1399                         clear_bit(epidx, &unshare_watch_bitmask);
1400                         clear_bit(epidx,
1401                                   &hw->hw_info.buffer_unshare_reserve_bit);
1402                 }
1403
1404                 msleep(100);
1405                 wait_time += 100;
1406         }
1407
1408         if (hw->hw_info.buffer_unshare_reserve_bit) {
1409                 for (epidx = 0; epidx < hw->max_epid; epidx++) {
1410                         if (epidx == hw->my_epid)
1411                                 continue;
1412
1413                         if (test_bit(epidx,
1414                                      &hw->hw_info.buffer_unshare_reserve_bit)) {
1415                                 mutex_lock(&hw->hw_info.lock);
1416
1417                                 ret = fjes_hw_unregister_buff_addr(hw, epidx);
1418                                 switch (ret) {
1419                                 case 0:
1420                                         break;
1421                                 case -ENOMSG:
1422                                 case -EBUSY:
1423                                 default:
1424                                         if (!work_pending(
1425                                                 &adapter->force_close_task)) {
1426                                                 adapter->force_reset = true;
1427                                                 schedule_work(
1428                                                         &adapter->force_close_task);
1429                                         }
1430                                         break;
1431                                 }
1432                                 mutex_unlock(&hw->hw_info.lock);
1433
1434                                 spin_lock_irqsave(&hw->rx_status_lock, flags);
1435                                 fjes_hw_setup_epbuf(
1436                                         &hw->ep_shm_info[epidx].tx,
1437                                         netdev->dev_addr, netdev->mtu);
1438                                 spin_unlock_irqrestore(&hw->rx_status_lock,
1439                                                        flags);
1440
1441                                 clear_bit(epidx, &hw->txrx_stop_req_bit);
1442                                 clear_bit(epidx, &unshare_watch_bitmask);
1443                                 clear_bit(epidx, &hw->hw_info.buffer_unshare_reserve_bit);
1444                         }
1445
1446                         if (test_bit(epidx, &unshare_watch_bitmask)) {
1447                                 spin_lock_irqsave(&hw->rx_status_lock, flags);
1448                                 hw->ep_shm_info[epidx].tx.info->v1i.rx_status &=
1449                                                 ~FJES_RX_STOP_REQ_DONE;
1450                                 spin_unlock_irqrestore(&hw->rx_status_lock,
1451                                                        flags);
1452                         }
1453                 }
1454         }
1455 }
1456
1457 /* fjes_init_module - Driver Registration Routine */
1458 static int __init fjes_init_module(void)
1459 {
1460         int result;
1461
1462         pr_info("%s - version %s - %s\n",
1463                 fjes_driver_string, fjes_driver_version, fjes_copyright);
1464
1465         result = platform_driver_register(&fjes_driver);
1466         if (result < 0)
1467                 return result;
1468
1469         result = acpi_bus_register_driver(&fjes_acpi_driver);
1470         if (result < 0)
1471                 goto fail_acpi_driver;
1472
1473         return 0;
1474
1475 fail_acpi_driver:
1476         platform_driver_unregister(&fjes_driver);
1477         return result;
1478 }
1479
1480 module_init(fjes_init_module);
1481
1482 /* fjes_exit_module - Driver Exit Cleanup Routine */
1483 static void __exit fjes_exit_module(void)
1484 {
1485         acpi_bus_unregister_driver(&fjes_acpi_driver);
1486         platform_driver_unregister(&fjes_driver);
1487 }
1488
1489 module_exit(fjes_exit_module);