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