net/eth.c

   1 /*
   2  * (C) Copyright 2001-2010
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <net.h>
  11 #include <miiphy.h>
  12 #include <phy.h>
  13 #include <asm/errno.h>
  14
  15 void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  16 {
  17         char *end;
  18         int i;
  19
  20         for (i = 0; i < 6; ++i) {
  21                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  22                 if (addr)
  23                         addr = (*end) ? end + 1 : end;
  24         }
  25 }
  26
  27 int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  28 {
  29         eth_parse_enetaddr(getenv(name), enetaddr);
  30         return is_valid_ether_addr(enetaddr);
  31 }
  32
  33 int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  34 {
  35         char buf[20];
  36
  37         sprintf(buf, "%pM", enetaddr);
  38
  39         return setenv(name, buf);
  40 }
  41
  42 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  43                                  uchar *enetaddr)
  44 {
  45         char enetvar[32];
  46         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  47         return eth_getenv_enetaddr(enetvar, enetaddr);
  48 }
  49
  50 static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  51                                  uchar *enetaddr)
  52 {
  53         char enetvar[32];
  54         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  55         return eth_setenv_enetaddr(enetvar, enetaddr);
  56 }
  57
  58
  59 static int eth_mac_skip(int index)
  60 {
  61         char enetvar[15];
  62         char *skip_state;
  63         sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  64         return ((skip_state = getenv(enetvar)) != NULL);
  65 }
  66
  67 /*
  68  * CPU and board-specific Ethernet initializations.  Aliased function
  69  * signals caller to move on
  70  */
  71 static int __def_eth_init(bd_t *bis)
  72 {
  73         return -1;
  74 }
  75 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  76 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  77
  78 #ifdef CONFIG_API
  79 static struct {
  80         uchar data[PKTSIZE];
  81         int length;
  82 } eth_rcv_bufs[PKTBUFSRX];
  83
  84 static unsigned int eth_rcv_current, eth_rcv_last;
  85 #endif
  86
  87 static struct eth_device *eth_devices;
  88 struct eth_device *eth_current;
  89
  90 struct eth_device *eth_get_dev_by_name(const char *devname)
  91 {
  92         struct eth_device *dev, *target_dev;
  93
  94         BUG_ON(devname == NULL);
  95
  96         if (!eth_devices)
  97                 return NULL;
  98
  99         dev = eth_devices;
 100         target_dev = NULL;
 101         do {
 102                 if (strcmp(devname, dev->name) == 0) {
 103                         target_dev = dev;
 104                         break;
 105                 }
 106                 dev = dev->next;
 107         } while (dev != eth_devices);
 108
 109         return target_dev;
 110 }
 111
 112 struct eth_device *eth_get_dev_by_index(int index)
 113 {
 114         struct eth_device *dev, *target_dev;
 115
 116         if (!eth_devices)
 117                 return NULL;
 118
 119         dev = eth_devices;
 120         target_dev = NULL;
 121         do {
 122                 if (dev->index == index) {
 123                         target_dev = dev;
 124                         break;
 125                 }
 126                 dev = dev->next;
 127         } while (dev != eth_devices);
 128
 129         return target_dev;
 130 }
 131
 132 int eth_get_dev_index(void)
 133 {
 134         if (!eth_current)
 135                 return -1;
 136
 137         return eth_current->index;
 138 }
 139
 140 static void eth_current_changed(void)
 141 {
 142         char *act = getenv("ethact");
 143         /* update current ethernet name */
 144         if (eth_current) {
 145                 if (act == NULL || strcmp(act, eth_current->name) != 0)
 146                         setenv("ethact", eth_current->name);
 147         }
 148         /*
 149          * remove the variable completely if there is no active
 150          * interface
 151          */
 152         else if (act != NULL)
 153                 setenv("ethact", NULL);
 154 }
 155
 156 static int eth_address_set(unsigned char *addr)
 157 {
 158         return memcmp(addr, "\0\0\0\0\0\0", 6);
 159 }
 160
 161 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 162                    int eth_number)
 163 {
 164         unsigned char env_enetaddr[6];
 165         int ret = 0;
 166
 167         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 168
 169         if (eth_address_set(env_enetaddr)) {
 170                 if (eth_address_set(dev->enetaddr) &&
 171                                 memcmp(dev->enetaddr, env_enetaddr, 6)) {
 172                         printf("\nWarning: %s MAC addresses don't match:\n",
 173                                 dev->name);
 174                         printf("Address in SROM is         %pM\n",
 175                                 dev->enetaddr);
 176                         printf("Address in environment is  %pM\n",
 177                                 env_enetaddr);
 178                 }
 179
 180                 memcpy(dev->enetaddr, env_enetaddr, 6);
 181         } else if (is_valid_ether_addr(dev->enetaddr)) {
 182                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 183                                              dev->enetaddr);
 184                 printf("\nWarning: %s using MAC address from net device\n",
 185                         dev->name);
 186         } else if (!(eth_address_set(dev->enetaddr))) {
 187                 printf("\nError: %s address not set.\n",
 188                        dev->name);
 189                 return -EINVAL;
 190         }
 191
 192         if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
 193                 if (!is_valid_ether_addr(dev->enetaddr)) {
 194                         printf("\nError: %s address %pM illegal value\n",
 195                                  dev->name, dev->enetaddr);
 196                         return -EINVAL;
 197                 }
 198
 199                 ret = dev->write_hwaddr(dev);
 200                 if (ret)
 201                         printf("\nWarning: %s failed to set MAC address\n", dev->name);
 202         }
 203
 204         return ret;
 205 }
 206
 207 int eth_register(struct eth_device *dev)
 208 {
 209         struct eth_device *d;
 210         static int index;
 211
 212         assert(strlen(dev->name) < sizeof(dev->name));
 213
 214         if (!eth_devices) {
 215                 eth_current = eth_devices = dev;
 216                 eth_current_changed();
 217         } else {
 218                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 219                         ;
 220                 d->next = dev;
 221         }
 222
 223         dev->state = ETH_STATE_INIT;
 224         dev->next  = eth_devices;
 225         dev->index = index++;
 226
 227         return 0;
 228 }
 229
 230 int eth_unregister(struct eth_device *dev)
 231 {
 232         struct eth_device *cur;
 233
 234         /* No device */
 235         if (!eth_devices)
 236                 return -1;
 237
 238         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 239              cur = cur->next)
 240                 ;
 241
 242         /* Device not found */
 243         if (cur->next != dev)
 244                 return -1;
 245
 246         cur->next = dev->next;
 247
 248         if (eth_devices == dev)
 249                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 250
 251         if (eth_current == dev) {
 252                 eth_current = eth_devices;
 253                 eth_current_changed();
 254         }
 255
 256         return 0;
 257 }
 258
 259 static void eth_env_init(bd_t *bis)
 260 {
 261         const char *s;
 262
 263         if ((s = getenv("bootfile")) != NULL)
 264                 copy_filename(BootFile, s, sizeof(BootFile));
 265 }
 266
 267 int eth_initialize(bd_t *bis)
 268 {
 269         int num_devices = 0;
 270         eth_devices = NULL;
 271         eth_current = NULL;
 272
 273         bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
 274 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
 275         miiphy_init();
 276 #endif
 277
 278 #ifdef CONFIG_PHYLIB
 279         phy_init();
 280 #endif
 281
 282         eth_env_init(bis);
 283
 284         /*
 285          * If board-specific initialization exists, call it.
 286          * If not, call a CPU-specific one
 287          */
 288         if (board_eth_init != __def_eth_init) {
 289                 if (board_eth_init(bis) < 0)
 290                         printf("Board Net Initialization Failed\n");
 291         } else if (cpu_eth_init != __def_eth_init) {
 292                 if (cpu_eth_init(bis) < 0)
 293                         printf("CPU Net Initialization Failed\n");
 294         } else
 295                 printf("Net Initialization Skipped\n");
 296
 297         if (!eth_devices) {
 298                 puts("No ethernet found.\n");
 299                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 300         } else {
 301                 struct eth_device *dev = eth_devices;
 302                 char *ethprime = getenv("ethprime");
 303
 304                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 305                 do {
 306                         if (dev->index)
 307                                 puts(", ");
 308
 309                         printf("%s", dev->name);
 310
 311                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 312                                 eth_current = dev;
 313                                 puts(" [PRIME]");
 314                         }
 315
 316                         if (strchr(dev->name, ' '))
 317                                 puts("\nWarning: eth device name has a space!"
 318                                         "\n");
 319
 320                         eth_write_hwaddr(dev, "eth", dev->index);
 321
 322                         dev = dev->next;
 323                         num_devices++;
 324                 } while (dev != eth_devices);
 325
 326                 eth_current_changed();
 327                 putc('\n');
 328         }
 329
 330         return num_devices;
 331 }
 332
 333 #ifdef CONFIG_MCAST_TFTP
 334 /* Multicast.
 335  * mcast_addr: multicast ipaddr from which multicast Mac is made
 336  * join: 1=join, 0=leave.
 337  */
 338 int eth_mcast_join(IPaddr_t mcast_ip, u8 join)
 339 {
 340         u8 mcast_mac[6];
 341         if (!eth_current || !eth_current->mcast)
 342                 return -1;
 343         mcast_mac[5] = htonl(mcast_ip) & 0xff;
 344         mcast_mac[4] = (htonl(mcast_ip)>>8) & 0xff;
 345         mcast_mac[3] = (htonl(mcast_ip)>>16) & 0x7f;
 346         mcast_mac[2] = 0x5e;
 347         mcast_mac[1] = 0x0;
 348         mcast_mac[0] = 0x1;
 349         return eth_current->mcast(eth_current, mcast_mac, join);
 350 }
 351
 352 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 353  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 354  * some other adapter -- hash tables
 355  */
 356 #define CRCPOLY_LE 0xedb88320
 357 u32 ether_crc(size_t len, unsigned char const *p)
 358 {
 359         int i;
 360         u32 crc;
 361         crc = ~0;
 362         while (len--) {
 363                 crc ^= *p++;
 364                 for (i = 0; i < 8; i++)
 365                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 366         }
 367         /* an reverse the bits, cuz of way they arrive -- last-first */
 368         crc = (crc >> 16) | (crc << 16);
 369         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 370         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 371         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 372         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 373         return crc;
 374 }
 375
 376 #endif
 377
 378
 379 int eth_init(bd_t *bis)
 380 {
 381         struct eth_device *old_current, *dev;
 382
 383         if (!eth_current) {
 384                 puts("No ethernet found.\n");
 385                 return -1;
 386         }
 387
 388         /* Sync environment with network devices */
 389         dev = eth_devices;
 390         do {
 391                 uchar env_enetaddr[6];
 392
 393                 if (eth_getenv_enetaddr_by_index("eth", dev->index,
 394                                                  env_enetaddr))
 395                         memcpy(dev->enetaddr, env_enetaddr, 6);
 396
 397                 dev = dev->next;
 398         } while (dev != eth_devices);
 399
 400         old_current = eth_current;
 401         do {
 402                 debug("Trying %s\n", eth_current->name);
 403
 404                 if (eth_current->init(eth_current, bis) >= 0) {
 405                         eth_current->state = ETH_STATE_ACTIVE;
 406
 407                         return 0;
 408                 }
 409                 debug("FAIL\n");
 410
 411                 eth_try_another(0);
 412         } while (old_current != eth_current);
 413
 414         return -1;
 415 }
 416
 417 void eth_halt(void)
 418 {
 419         if (!eth_current)
 420                 return;
 421
 422         eth_current->halt(eth_current);
 423
 424         eth_current->state = ETH_STATE_PASSIVE;
 425 }
 426
 427 int eth_send(void *packet, int length)
 428 {
 429         if (!eth_current)
 430                 return -1;
 431
 432         return eth_current->send(eth_current, packet, length);
 433 }
 434
 435 int eth_rx(void)
 436 {
 437         if (!eth_current)
 438                 return -1;
 439
 440         return eth_current->recv(eth_current);
 441 }
 442
 443 #ifdef CONFIG_API
 444 static void eth_save_packet(void *packet, int length)
 445 {
 446         char *p = packet;
 447         int i;
 448
 449         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 450                 return;
 451
 452         if (PKTSIZE < length)
 453                 return;
 454
 455         for (i = 0; i < length; i++)
 456                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 457
 458         eth_rcv_bufs[eth_rcv_last].length = length;
 459         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 460 }
 461
 462 int eth_receive(void *packet, int length)
 463 {
 464         char *p = packet;
 465         void *pp = push_packet;
 466         int i;
 467
 468         if (eth_rcv_current == eth_rcv_last) {
 469                 push_packet = eth_save_packet;
 470                 eth_rx();
 471                 push_packet = pp;
 472
 473                 if (eth_rcv_current == eth_rcv_last)
 474                         return -1;
 475         }
 476
 477         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 478
 479         for (i = 0; i < length; i++)
 480                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 481
 482         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 483         return length;
 484 }
 485 #endif /* CONFIG_API */
 486
 487 void eth_try_another(int first_restart)
 488 {
 489         static struct eth_device *first_failed;
 490         char *ethrotate;
 491
 492         /*
 493          * Do not rotate between network interfaces when
 494          * 'ethrotate' variable is set to 'no'.
 495          */
 496         ethrotate = getenv("ethrotate");
 497         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
 498                 return;
 499
 500         if (!eth_current)
 501                 return;
 502
 503         if (first_restart)
 504                 first_failed = eth_current;
 505
 506         eth_current = eth_current->next;
 507
 508         eth_current_changed();
 509
 510         if (first_failed == eth_current)
 511                 NetRestartWrap = 1;
 512 }
 513
 514 void eth_set_current(void)
 515 {
 516         static char *act;
 517         static int  env_changed_id;
 518         struct eth_device *old_current;
 519         int     env_id;
 520
 521         if (!eth_current)       /* XXX no current */
 522                 return;
 523
 524         env_id = get_env_id();
 525         if ((act == NULL) || (env_changed_id != env_id)) {
 526                 act = getenv("ethact");
 527                 env_changed_id = env_id;
 528         }
 529         if (act != NULL) {
 530                 old_current = eth_current;
 531                 do {
 532                         if (strcmp(eth_current->name, act) == 0)
 533                                 return;
 534                         eth_current = eth_current->next;
 535                 } while (old_current != eth_current);
 536         }
 537
 538         eth_current_changed();
 539 }
 540
 541 char *eth_get_name(void)
 542 {
 543         return eth_current ? eth_current->name : "unknown";
 544 }