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