net/eth.c

   1 /*
   2  * (C) Copyright 2001-2015
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  * Joe Hershberger, National Instruments
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <net.h>
  13 #include <miiphy.h>
  14 #include <phy.h>
  15 #include <asm/errno.h>
  16 #include <dm/device-internal.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  21 {
  22         char *end;
  23         int i;
  24
  25         for (i = 0; i < 6; ++i) {
  26                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  27                 if (addr)
  28                         addr = (*end) ? end + 1 : end;
  29         }
  30 }
  31
  32 int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  33 {
  34         eth_parse_enetaddr(getenv(name), enetaddr);
  35         return is_valid_ethaddr(enetaddr);
  36 }
  37
  38 int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  39 {
  40         char buf[20];
  41
  42         sprintf(buf, "%pM", enetaddr);
  43
  44         return setenv(name, buf);
  45 }
  46
  47 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  48                                  uchar *enetaddr)
  49 {
  50         char enetvar[32];
  51         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  52         return eth_getenv_enetaddr(enetvar, enetaddr);
  53 }
  54
  55 static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  56                                  uchar *enetaddr)
  57 {
  58         char enetvar[32];
  59         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  60         return eth_setenv_enetaddr(enetvar, enetaddr);
  61 }
  62
  63 static void eth_env_init(void)
  64 {
  65         const char *s;
  66
  67         s = getenv("bootfile");
  68         if (s != NULL)
  69                 copy_filename(net_boot_file_name, s,
  70                               sizeof(net_boot_file_name));
  71 }
  72
  73 static int eth_mac_skip(int index)
  74 {
  75         char enetvar[15];
  76         char *skip_state;
  77
  78         sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  79         skip_state = getenv(enetvar);
  80         return skip_state != NULL;
  81 }
  82
  83 static void eth_current_changed(void);
  84
  85 /*
  86  * CPU and board-specific Ethernet initializations.  Aliased function
  87  * signals caller to move on
  88  */
  89 static int __def_eth_init(bd_t *bis)
  90 {
  91         return -1;
  92 }
  93 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  94 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  95
  96 static void eth_common_init(void)
  97 {
  98         bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
  99 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
 100         miiphy_init();
 101 #endif
 102
 103 #ifdef CONFIG_PHYLIB
 104         phy_init();
 105 #endif
 106
 107         eth_env_init();
 108
 109         /*
 110          * If board-specific initialization exists, call it.
 111          * If not, call a CPU-specific one
 112          */
 113         if (board_eth_init != __def_eth_init) {
 114                 if (board_eth_init(gd->bd) < 0)
 115                         printf("Board Net Initialization Failed\n");
 116         } else if (cpu_eth_init != __def_eth_init) {
 117                 if (cpu_eth_init(gd->bd) < 0)
 118                         printf("CPU Net Initialization Failed\n");
 119         } else {
 120                 printf("Net Initialization Skipped\n");
 121         }
 122 }
 123
 124 #ifdef CONFIG_DM_ETH
 125 /**
 126  * struct eth_device_priv - private structure for each Ethernet device
 127  *
 128  * @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
 129  */
 130 struct eth_device_priv {
 131         enum eth_state_t state;
 132 };
 133
 134 /**
 135  * struct eth_uclass_priv - The structure attached to the uclass itself
 136  *
 137  * @current: The Ethernet device that the network functions are using
 138  */
 139 struct eth_uclass_priv {
 140         struct udevice *current;
 141 };
 142
 143 /* eth_errno - This stores the most recent failure code from DM functions */
 144 static int eth_errno;
 145
 146 static struct eth_uclass_priv *eth_get_uclass_priv(void)
 147 {
 148         struct uclass *uc;
 149
 150         uclass_get(UCLASS_ETH, &uc);
 151         assert(uc);
 152         return uc->priv;
 153 }
 154
 155 static void eth_set_current_to_next(void)
 156 {
 157         struct eth_uclass_priv *uc_priv;
 158
 159         uc_priv = eth_get_uclass_priv();
 160         if (uc_priv->current)
 161                 uclass_next_device(&uc_priv->current);
 162         if (!uc_priv->current)
 163                 uclass_first_device(UCLASS_ETH, &uc_priv->current);
 164 }
 165
 166 /*
 167  * Typically this will simply return the active device.
 168  * In the case where the most recent active device was unset, this will attempt
 169  * to return the first device. If that device doesn't exist or fails to probe,
 170  * this function will return NULL.
 171  */
 172 struct udevice *eth_get_dev(void)
 173 {
 174         struct eth_uclass_priv *uc_priv;
 175
 176         uc_priv = eth_get_uclass_priv();
 177         if (!uc_priv->current)
 178                 eth_errno = uclass_first_device(UCLASS_ETH,
 179                                     &uc_priv->current);
 180         return uc_priv->current;
 181 }
 182
 183 /*
 184  * Typically this will just store a device pointer.
 185  * In case it was not probed, we will attempt to do so.
 186  * dev may be NULL to unset the active device.
 187  */
 188 static void eth_set_dev(struct udevice *dev)
 189 {
 190         if (dev && !device_active(dev))
 191                 eth_errno = device_probe(dev);
 192         eth_get_uclass_priv()->current = dev;
 193 }
 194
 195 /*
 196  * Find the udevice that either has the name passed in as devname or has an
 197  * alias named devname.
 198  */
 199 struct udevice *eth_get_dev_by_name(const char *devname)
 200 {
 201         int seq = -1;
 202         char *endp = NULL;
 203         const char *startp = NULL;
 204         struct udevice *it;
 205         struct uclass *uc;
 206
 207         /* Must be longer than 3 to be an alias */
 208         if (strlen(devname) > strlen("eth")) {
 209                 startp = devname + strlen("eth");
 210                 seq = simple_strtoul(startp, &endp, 10);
 211         }
 212
 213         uclass_get(UCLASS_ETH, &uc);
 214         uclass_foreach_dev(it, uc) {
 215                 /*
 216                  * We need the seq to be valid, so try to probe it.
 217                  * If the probe fails, the seq will not match since it will be
 218                  * -1 instead of what we are looking for.
 219                  * We don't care about errors from probe here. Either they won't
 220                  * match an alias or it will match a literal name and we'll pick
 221                  * up the error when we try to probe again in eth_set_dev().
 222                  */
 223                 device_probe(it);
 224                 /*
 225                  * Check for the name or the sequence number to match
 226                  */
 227                 if (strcmp(it->name, devname) == 0 ||
 228                     (endp > startp && it->seq == seq))
 229                         return it;
 230         }
 231
 232         return NULL;
 233 }
 234
 235 unsigned char *eth_get_ethaddr(void)
 236 {
 237         struct eth_pdata *pdata;
 238
 239         if (eth_get_dev()) {
 240                 pdata = eth_get_dev()->platdata;
 241                 return pdata->enetaddr;
 242         }
 243
 244         return NULL;
 245 }
 246
 247 /* Set active state without calling start on the driver */
 248 int eth_init_state_only(void)
 249 {
 250         struct udevice *current;
 251         struct eth_device_priv *priv;
 252
 253         current = eth_get_dev();
 254         if (!current || !device_active(current))
 255                 return -EINVAL;
 256
 257         priv = current->uclass_priv;
 258         priv->state = ETH_STATE_ACTIVE;
 259
 260         return 0;
 261 }
 262
 263 /* Set passive state without calling stop on the driver */
 264 void eth_halt_state_only(void)
 265 {
 266         struct udevice *current;
 267         struct eth_device_priv *priv;
 268
 269         current = eth_get_dev();
 270         if (!current || !device_active(current))
 271                 return;
 272
 273         priv = current->uclass_priv;
 274         priv->state = ETH_STATE_PASSIVE;
 275 }
 276
 277 int eth_get_dev_index(void)
 278 {
 279         if (eth_get_dev())
 280                 return eth_get_dev()->seq;
 281         return -1;
 282 }
 283
 284 int eth_init(void)
 285 {
 286         struct udevice *current;
 287         struct udevice *old_current;
 288         int ret = -ENODEV;
 289
 290         current = eth_get_dev();
 291         if (!current) {
 292                 printf("No ethernet found.\n");
 293                 return -ENODEV;
 294         }
 295
 296         old_current = current;
 297         do {
 298                 debug("Trying %s\n", current->name);
 299
 300                 if (device_active(current)) {
 301                         uchar env_enetaddr[6];
 302                         struct eth_pdata *pdata = current->platdata;
 303
 304                         /* Sync environment with network device */
 305                         if (eth_getenv_enetaddr_by_index("eth", current->seq,
 306                                                          env_enetaddr))
 307                                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 308                         else
 309                                 memset(pdata->enetaddr, 0, 6);
 310
 311                         ret = eth_get_ops(current)->start(current);
 312                         if (ret >= 0) {
 313                                 struct eth_device_priv *priv =
 314                                         current->uclass_priv;
 315
 316                                 priv->state = ETH_STATE_ACTIVE;
 317                                 return 0;
 318                         }
 319                 } else {
 320                         ret = eth_errno;
 321                 }
 322
 323                 debug("FAIL\n");
 324
 325                 /*
 326                  * If ethrotate is enabled, this will change "current",
 327                  * otherwise we will drop out of this while loop immediately
 328                  */
 329                 eth_try_another(0);
 330                 /* This will ensure the new "current" attempted to probe */
 331                 current = eth_get_dev();
 332         } while (old_current != current);
 333
 334         return ret;
 335 }
 336
 337 void eth_halt(void)
 338 {
 339         struct udevice *current;
 340         struct eth_device_priv *priv;
 341
 342         current = eth_get_dev();
 343         if (!current || !device_active(current))
 344                 return;
 345
 346         eth_get_ops(current)->stop(current);
 347         priv = current->uclass_priv;
 348         priv->state = ETH_STATE_PASSIVE;
 349 }
 350
 351 int eth_send(void *packet, int length)
 352 {
 353         struct udevice *current;
 354         int ret;
 355
 356         current = eth_get_dev();
 357         if (!current)
 358                 return -ENODEV;
 359
 360         if (!device_active(current))
 361                 return -EINVAL;
 362
 363         ret = eth_get_ops(current)->send(current, packet, length);
 364         if (ret < 0) {
 365                 /* We cannot completely return the error at present */
 366                 debug("%s: send() returned error %d\n", __func__, ret);
 367         }
 368         return ret;
 369 }
 370
 371 int eth_rx(void)
 372 {
 373         struct udevice *current;
 374         uchar *packet;
 375         int ret;
 376         int i;
 377
 378         current = eth_get_dev();
 379         if (!current)
 380                 return -ENODEV;
 381
 382         if (!device_active(current))
 383                 return -EINVAL;
 384
 385         /* Process up to 32 packets at one time */
 386         for (i = 0; i < 32; i++) {
 387                 ret = eth_get_ops(current)->recv(current, &packet);
 388                 if (ret > 0)
 389                         net_process_received_packet(packet, ret);
 390                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 391                         eth_get_ops(current)->free_pkt(current, packet, ret);
 392                 if (ret <= 0)
 393                         break;
 394         }
 395         if (ret == -EAGAIN)
 396                 ret = 0;
 397         if (ret < 0) {
 398                 /* We cannot completely return the error at present */
 399                 debug("%s: recv() returned error %d\n", __func__, ret);
 400         }
 401         return ret;
 402 }
 403
 404 static int eth_write_hwaddr(struct udevice *dev)
 405 {
 406         struct eth_pdata *pdata = dev->platdata;
 407         int ret = 0;
 408
 409         if (!dev || !device_active(dev))
 410                 return -EINVAL;
 411
 412         /* seq is valid since the device is active */
 413         if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
 414                 if (!is_valid_ethaddr(pdata->enetaddr)) {
 415                         printf("\nError: %s address %pM illegal value\n",
 416                                dev->name, pdata->enetaddr);
 417                         return -EINVAL;
 418                 }
 419
 420                 ret = eth_get_ops(dev)->write_hwaddr(dev);
 421                 if (ret)
 422                         printf("\nWarning: %s failed to set MAC address\n",
 423                                dev->name);
 424         }
 425
 426         return ret;
 427 }
 428
 429 int eth_initialize(void)
 430 {
 431         int num_devices = 0;
 432         struct udevice *dev;
 433
 434         eth_common_init();
 435
 436         /*
 437          * Devices need to write the hwaddr even if not started so that Linux
 438          * will have access to the hwaddr that u-boot stored for the device.
 439          * This is accomplished by attempting to probe each device and calling
 440          * their write_hwaddr() operation.
 441          */
 442         uclass_first_device(UCLASS_ETH, &dev);
 443         if (!dev) {
 444                 printf("No ethernet found.\n");
 445                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 446         } else {
 447                 char *ethprime = getenv("ethprime");
 448                 struct udevice *prime_dev = NULL;
 449
 450                 if (ethprime)
 451                         prime_dev = eth_get_dev_by_name(ethprime);
 452                 if (prime_dev) {
 453                         eth_set_dev(prime_dev);
 454                         eth_current_changed();
 455                 } else {
 456                         eth_set_dev(NULL);
 457                 }
 458
 459                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 460                 do {
 461                         if (num_devices)
 462                                 printf(", ");
 463
 464                         printf("eth%d: %s", dev->seq, dev->name);
 465
 466                         if (ethprime && dev == prime_dev)
 467                                 printf(" [PRIME]");
 468
 469                         eth_write_hwaddr(dev);
 470
 471                         uclass_next_device(&dev);
 472                         num_devices++;
 473                 } while (dev);
 474
 475                 putc('\n');
 476         }
 477
 478         return num_devices;
 479 }
 480
 481 static int eth_post_bind(struct udevice *dev)
 482 {
 483         if (strchr(dev->name, ' ')) {
 484                 printf("\nError: eth device name \"%s\" has a space!\n",
 485                        dev->name);
 486                 return -EINVAL;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int eth_pre_unbind(struct udevice *dev)
 493 {
 494         /* Don't hang onto a pointer that is going away */
 495         if (dev == eth_get_uclass_priv()->current)
 496                 eth_set_dev(NULL);
 497
 498         return 0;
 499 }
 500
 501 static int eth_post_probe(struct udevice *dev)
 502 {
 503         struct eth_device_priv *priv = dev->uclass_priv;
 504         struct eth_pdata *pdata = dev->platdata;
 505         unsigned char env_enetaddr[6];
 506
 507         priv->state = ETH_STATE_INIT;
 508
 509         /* Check if the device has a MAC address in ROM */
 510         if (eth_get_ops(dev)->read_rom_hwaddr)
 511                 eth_get_ops(dev)->read_rom_hwaddr(dev);
 512
 513         eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
 514         if (!is_zero_ethaddr(env_enetaddr)) {
 515                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 516                     memcmp(pdata->enetaddr, env_enetaddr, 6)) {
 517                         printf("\nWarning: %s MAC addresses don't match:\n",
 518                                dev->name);
 519                         printf("Address in SROM is         %pM\n",
 520                                pdata->enetaddr);
 521                         printf("Address in environment is  %pM\n",
 522                                env_enetaddr);
 523                 }
 524
 525                 /* Override the ROM MAC address */
 526                 memcpy(pdata->enetaddr, env_enetaddr, 6);
 527         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 528                 eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 529                 printf("\nWarning: %s using MAC address from ROM\n",
 530                        dev->name);
 531         } else if (is_zero_ethaddr(pdata->enetaddr)) {
 532                 printf("\nError: %s address not set.\n",
 533                        dev->name);
 534                 return -EINVAL;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int eth_pre_remove(struct udevice *dev)
 541 {
 542         eth_get_ops(dev)->stop(dev);
 543
 544         return 0;
 545 }
 546
 547 UCLASS_DRIVER(eth) = {
 548         .name           = "eth",
 549         .id             = UCLASS_ETH,
 550         .post_bind      = eth_post_bind,
 551         .pre_unbind     = eth_pre_unbind,
 552         .post_probe     = eth_post_probe,
 553         .pre_remove     = eth_pre_remove,
 554         .priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
 555         .per_device_auto_alloc_size = sizeof(struct eth_device_priv),
 556         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 557 };
 558 #endif
 559
 560 #ifndef CONFIG_DM_ETH
 561
 562 #ifdef CONFIG_API
 563 static struct {
 564         uchar data[PKTSIZE];
 565         int length;
 566 } eth_rcv_bufs[PKTBUFSRX];
 567
 568 static unsigned int eth_rcv_current, eth_rcv_last;
 569 #endif
 570
 571 static struct eth_device *eth_devices;
 572 struct eth_device *eth_current;
 573
 574 static void eth_set_current_to_next(void)
 575 {
 576         eth_current = eth_current->next;
 577 }
 578
 579 static void eth_set_dev(struct eth_device *dev)
 580 {
 581         eth_current = dev;
 582 }
 583
 584 struct eth_device *eth_get_dev_by_name(const char *devname)
 585 {
 586         struct eth_device *dev, *target_dev;
 587
 588         BUG_ON(devname == NULL);
 589
 590         if (!eth_devices)
 591                 return NULL;
 592
 593         dev = eth_devices;
 594         target_dev = NULL;
 595         do {
 596                 if (strcmp(devname, dev->name) == 0) {
 597                         target_dev = dev;
 598                         break;
 599                 }
 600                 dev = dev->next;
 601         } while (dev != eth_devices);
 602
 603         return target_dev;
 604 }
 605
 606 struct eth_device *eth_get_dev_by_index(int index)
 607 {
 608         struct eth_device *dev, *target_dev;
 609
 610         if (!eth_devices)
 611                 return NULL;
 612
 613         dev = eth_devices;
 614         target_dev = NULL;
 615         do {
 616                 if (dev->index == index) {
 617                         target_dev = dev;
 618                         break;
 619                 }
 620                 dev = dev->next;
 621         } while (dev != eth_devices);
 622
 623         return target_dev;
 624 }
 625
 626 int eth_get_dev_index(void)
 627 {
 628         if (!eth_current)
 629                 return -1;
 630
 631         return eth_current->index;
 632 }
 633
 634 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 635                    int eth_number)
 636 {
 637         unsigned char env_enetaddr[6];
 638         int ret = 0;
 639
 640         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 641
 642         if (!is_zero_ethaddr(env_enetaddr)) {
 643                 if (!is_zero_ethaddr(dev->enetaddr) &&
 644                     memcmp(dev->enetaddr, env_enetaddr, 6)) {
 645                         printf("\nWarning: %s MAC addresses don't match:\n",
 646                                dev->name);
 647                         printf("Address in SROM is         %pM\n",
 648                                dev->enetaddr);
 649                         printf("Address in environment is  %pM\n",
 650                                env_enetaddr);
 651                 }
 652
 653                 memcpy(dev->enetaddr, env_enetaddr, 6);
 654         } else if (is_valid_ethaddr(dev->enetaddr)) {
 655                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 656                                              dev->enetaddr);
 657                 printf("\nWarning: %s using MAC address from net device\n",
 658                        dev->name);
 659         } else if (is_zero_ethaddr(dev->enetaddr)) {
 660                 printf("\nError: %s address not set.\n",
 661                        dev->name);
 662                 return -EINVAL;
 663         }
 664
 665         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 666                 if (!is_valid_ethaddr(dev->enetaddr)) {
 667                         printf("\nError: %s address %pM illegal value\n",
 668                                dev->name, dev->enetaddr);
 669                         return -EINVAL;
 670                 }
 671
 672                 ret = dev->write_hwaddr(dev);
 673                 if (ret)
 674                         printf("\nWarning: %s failed to set MAC address\n",
 675                                dev->name);
 676         }
 677
 678         return ret;
 679 }
 680
 681 int eth_register(struct eth_device *dev)
 682 {
 683         struct eth_device *d;
 684         static int index;
 685
 686         assert(strlen(dev->name) < sizeof(dev->name));
 687
 688         if (!eth_devices) {
 689                 eth_devices = dev;
 690                 eth_current = dev;
 691                 eth_current_changed();
 692         } else {
 693                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 694                         ;
 695                 d->next = dev;
 696         }
 697
 698         dev->state = ETH_STATE_INIT;
 699         dev->next  = eth_devices;
 700         dev->index = index++;
 701
 702         return 0;
 703 }
 704
 705 int eth_unregister(struct eth_device *dev)
 706 {
 707         struct eth_device *cur;
 708
 709         /* No device */
 710         if (!eth_devices)
 711                 return -ENODEV;
 712
 713         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 714              cur = cur->next)
 715                 ;
 716
 717         /* Device not found */
 718         if (cur->next != dev)
 719                 return -ENODEV;
 720
 721         cur->next = dev->next;
 722
 723         if (eth_devices == dev)
 724                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 725
 726         if (eth_current == dev) {
 727                 eth_current = eth_devices;
 728                 eth_current_changed();
 729         }
 730
 731         return 0;
 732 }
 733
 734 int eth_initialize(void)
 735 {
 736         int num_devices = 0;
 737
 738         eth_devices = NULL;
 739         eth_current = NULL;
 740         eth_common_init();
 741
 742         if (!eth_devices) {
 743                 puts("No ethernet found.\n");
 744                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 745         } else {
 746                 struct eth_device *dev = eth_devices;
 747                 char *ethprime = getenv("ethprime");
 748
 749                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 750                 do {
 751                         if (dev->index)
 752                                 puts(", ");
 753
 754                         printf("%s", dev->name);
 755
 756                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 757                                 eth_current = dev;
 758                                 puts(" [PRIME]");
 759                         }
 760
 761                         if (strchr(dev->name, ' '))
 762                                 puts("\nWarning: eth device name has a space!"
 763                                         "\n");
 764
 765                         eth_write_hwaddr(dev, "eth", dev->index);
 766
 767                         dev = dev->next;
 768                         num_devices++;
 769                 } while (dev != eth_devices);
 770
 771                 eth_current_changed();
 772                 putc('\n');
 773         }
 774
 775         return num_devices;
 776 }
 777
 778 #ifdef CONFIG_MCAST_TFTP
 779 /* Multicast.
 780  * mcast_addr: multicast ipaddr from which multicast Mac is made
 781  * join: 1=join, 0=leave.
 782  */
 783 int eth_mcast_join(struct in_addr mcast_ip, int join)
 784 {
 785         u8 mcast_mac[6];
 786         if (!eth_current || !eth_current->mcast)
 787                 return -1;
 788         mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
 789         mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
 790         mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
 791         mcast_mac[2] = 0x5e;
 792         mcast_mac[1] = 0x0;
 793         mcast_mac[0] = 0x1;
 794         return eth_current->mcast(eth_current, mcast_mac, join);
 795 }
 796
 797 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 798  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 799  * some other adapter -- hash tables
 800  */
 801 #define CRCPOLY_LE 0xedb88320
 802 u32 ether_crc(size_t len, unsigned char const *p)
 803 {
 804         int i;
 805         u32 crc;
 806         crc = ~0;
 807         while (len--) {
 808                 crc ^= *p++;
 809                 for (i = 0; i < 8; i++)
 810                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 811         }
 812         /* an reverse the bits, cuz of way they arrive -- last-first */
 813         crc = (crc >> 16) | (crc << 16);
 814         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 815         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 816         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 817         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 818         return crc;
 819 }
 820
 821 #endif
 822
 823
 824 int eth_init(void)
 825 {
 826         struct eth_device *old_current, *dev;
 827
 828         if (!eth_current) {
 829                 puts("No ethernet found.\n");
 830                 return -ENODEV;
 831         }
 832
 833         /* Sync environment with network devices */
 834         dev = eth_devices;
 835         do {
 836                 uchar env_enetaddr[6];
 837
 838                 if (eth_getenv_enetaddr_by_index("eth", dev->index,
 839                                                  env_enetaddr))
 840                         memcpy(dev->enetaddr, env_enetaddr, 6);
 841
 842                 dev = dev->next;
 843         } while (dev != eth_devices);
 844
 845         old_current = eth_current;
 846         do {
 847                 debug("Trying %s\n", eth_current->name);
 848
 849                 if (eth_current->init(eth_current, gd->bd) >= 0) {
 850                         eth_current->state = ETH_STATE_ACTIVE;
 851
 852                         return 0;
 853                 }
 854                 debug("FAIL\n");
 855
 856                 eth_try_another(0);
 857         } while (old_current != eth_current);
 858
 859         return -ETIMEDOUT;
 860 }
 861
 862 void eth_halt(void)
 863 {
 864         if (!eth_current)
 865                 return;
 866
 867         eth_current->halt(eth_current);
 868
 869         eth_current->state = ETH_STATE_PASSIVE;
 870 }
 871
 872 int eth_send(void *packet, int length)
 873 {
 874         if (!eth_current)
 875                 return -ENODEV;
 876
 877         return eth_current->send(eth_current, packet, length);
 878 }
 879
 880 int eth_rx(void)
 881 {
 882         if (!eth_current)
 883                 return -ENODEV;
 884
 885         return eth_current->recv(eth_current);
 886 }
 887 #endif /* ifndef CONFIG_DM_ETH */
 888
 889 #ifdef CONFIG_API
 890 static void eth_save_packet(void *packet, int length)
 891 {
 892         char *p = packet;
 893         int i;
 894
 895         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 896                 return;
 897
 898         if (PKTSIZE < length)
 899                 return;
 900
 901         for (i = 0; i < length; i++)
 902                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 903
 904         eth_rcv_bufs[eth_rcv_last].length = length;
 905         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 906 }
 907
 908 int eth_receive(void *packet, int length)
 909 {
 910         char *p = packet;
 911         void *pp = push_packet;
 912         int i;
 913
 914         if (eth_rcv_current == eth_rcv_last) {
 915                 push_packet = eth_save_packet;
 916                 eth_rx();
 917                 push_packet = pp;
 918
 919                 if (eth_rcv_current == eth_rcv_last)
 920                         return -1;
 921         }
 922
 923         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 924
 925         for (i = 0; i < length; i++)
 926                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 927
 928         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 929         return length;
 930 }
 931 #endif /* CONFIG_API */
 932
 933 static void eth_current_changed(void)
 934 {
 935         char *act = getenv("ethact");
 936         /* update current ethernet name */
 937         if (eth_get_dev()) {
 938                 if (act == NULL || strcmp(act, eth_get_name()) != 0)
 939                         setenv("ethact", eth_get_name());
 940         }
 941         /*
 942          * remove the variable completely if there is no active
 943          * interface
 944          */
 945         else if (act != NULL)
 946                 setenv("ethact", NULL);
 947 }
 948
 949 void eth_try_another(int first_restart)
 950 {
 951         static void *first_failed;
 952         char *ethrotate;
 953
 954         /*
 955          * Do not rotate between network interfaces when
 956          * 'ethrotate' variable is set to 'no'.
 957          */
 958         ethrotate = getenv("ethrotate");
 959         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
 960                 return;
 961
 962         if (!eth_get_dev())
 963                 return;
 964
 965         if (first_restart)
 966                 first_failed = eth_get_dev();
 967
 968         eth_set_current_to_next();
 969
 970         eth_current_changed();
 971
 972         if (first_failed == eth_get_dev())
 973                 net_restart_wrap = 1;
 974 }
 975
 976 void eth_set_current(void)
 977 {
 978         static char *act;
 979         static int  env_changed_id;
 980         int     env_id;
 981
 982         env_id = get_env_id();
 983         if ((act == NULL) || (env_changed_id != env_id)) {
 984                 act = getenv("ethact");
 985                 env_changed_id = env_id;
 986         }
 987
 988         if (act == NULL) {
 989                 char *ethprime = getenv("ethprime");
 990                 void *dev = NULL;
 991
 992                 if (ethprime)
 993                         dev = eth_get_dev_by_name(ethprime);
 994                 if (dev)
 995                         eth_set_dev(dev);
 996                 else
 997                         eth_set_dev(NULL);
 998         } else {
 999                 eth_set_dev(eth_get_dev_by_name(act));
1000         }
1001
1002         eth_current_changed();
1003 }
1004
1005 const char *eth_get_name(void)
1006 {
1007         return eth_get_dev() ? eth_get_dev()->name : "unknown";
1008 }