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