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
  14 void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
  15 {
  16         char *end;
  17         int i;
  18
  19         for (i = 0; i < 6; ++i) {
  20                 enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
  21                 if (addr)
  22                         addr = (*end) ? end + 1 : end;
  23         }
  24 }
  25
  26 int eth_getenv_enetaddr(char *name, uchar *enetaddr)
  27 {
  28         eth_parse_enetaddr(getenv(name), enetaddr);
  29         return is_valid_ether_addr(enetaddr);
  30 }
  31
  32 int eth_setenv_enetaddr(char *name, const uchar *enetaddr)
  33 {
  34         char buf[20];
  35
  36         sprintf(buf, "%pM", enetaddr);
  37
  38         return setenv(name, buf);
  39 }
  40
  41 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
  42                                  uchar *enetaddr)
  43 {
  44         char enetvar[32];
  45         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  46         return eth_getenv_enetaddr(enetvar, enetaddr);
  47 }
  48
  49 static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
  50                                  uchar *enetaddr)
  51 {
  52         char enetvar[32];
  53         sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
  54         return eth_setenv_enetaddr(enetvar, enetaddr);
  55 }
  56
  57
  58 static int eth_mac_skip(int index)
  59 {
  60         char enetvar[15];
  61         char *skip_state;
  62         sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
  63         return ((skip_state = getenv(enetvar)) != NULL);
  64 }
  65
  66 #ifdef CONFIG_RANDOM_MACADDR
  67 void eth_random_enetaddr(uchar *enetaddr)
  68 {
  69         uint32_t rval;
  70
  71         srand(get_timer(0));
  72
  73         rval = rand();
  74         enetaddr[0] = rval & 0xff;
  75         enetaddr[1] = (rval >> 8) & 0xff;
  76         enetaddr[2] = (rval >> 16) & 0xff;
  77
  78         rval = rand();
  79         enetaddr[3] = rval & 0xff;
  80         enetaddr[4] = (rval >> 8) & 0xff;
  81         enetaddr[5] = (rval >> 16) & 0xff;
  82
  83         /* make sure it's local and unicast */
  84         enetaddr[0] = (enetaddr[0] | 0x02) & ~0x01;
  85 }
  86 #endif
  87
  88 /*
  89  * CPU and board-specific Ethernet initializations.  Aliased function
  90  * signals caller to move on
  91  */
  92 static int __def_eth_init(bd_t *bis)
  93 {
  94         return -1;
  95 }
  96 int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  97 int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
  98
  99 #ifdef CONFIG_API
 100 static struct {
 101         uchar data[PKTSIZE];
 102         int length;
 103 } eth_rcv_bufs[PKTBUFSRX];
 104
 105 static unsigned int eth_rcv_current, eth_rcv_last;
 106 #endif
 107
 108 static struct eth_device *eth_devices;
 109 struct eth_device *eth_current;
 110
 111 struct eth_device *eth_get_dev_by_name(const char *devname)
 112 {
 113         struct eth_device *dev, *target_dev;
 114
 115         BUG_ON(devname == NULL);
 116
 117         if (!eth_devices)
 118                 return NULL;
 119
 120         dev = eth_devices;
 121         target_dev = NULL;
 122         do {
 123                 if (strcmp(devname, dev->name) == 0) {
 124                         target_dev = dev;
 125                         break;
 126                 }
 127                 dev = dev->next;
 128         } while (dev != eth_devices);
 129
 130         return target_dev;
 131 }
 132
 133 struct eth_device *eth_get_dev_by_index(int index)
 134 {
 135         struct eth_device *dev, *target_dev;
 136
 137         if (!eth_devices)
 138                 return NULL;
 139
 140         dev = eth_devices;
 141         target_dev = NULL;
 142         do {
 143                 if (dev->index == index) {
 144                         target_dev = dev;
 145                         break;
 146                 }
 147                 dev = dev->next;
 148         } while (dev != eth_devices);
 149
 150         return target_dev;
 151 }
 152
 153 int eth_get_dev_index(void)
 154 {
 155         if (!eth_current)
 156                 return -1;
 157
 158         return eth_current->index;
 159 }
 160
 161 static void eth_current_changed(void)
 162 {
 163         char *act = getenv("ethact");
 164         /* update current ethernet name */
 165         if (eth_current) {
 166                 if (act == NULL || strcmp(act, eth_current->name) != 0)
 167                         setenv("ethact", eth_current->name);
 168         }
 169         /*
 170          * remove the variable completely if there is no active
 171          * interface
 172          */
 173         else if (act != NULL)
 174                 setenv("ethact", NULL);
 175 }
 176
 177 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 178                    int eth_number)
 179 {
 180         unsigned char env_enetaddr[6];
 181         int ret = 0;
 182
 183         eth_getenv_enetaddr_by_index(base_name, eth_number, env_enetaddr);
 184
 185         if (memcmp(env_enetaddr, "\0\0\0\0\0\0", 6)) {
 186                 if (memcmp(dev->enetaddr, "\0\0\0\0\0\0", 6) &&
 187                                 memcmp(dev->enetaddr, env_enetaddr, 6)) {
 188                         printf("\nWarning: %s MAC addresses don't match:\n",
 189                                 dev->name);
 190                         printf("Address in SROM is         %pM\n",
 191                                 dev->enetaddr);
 192                         printf("Address in environment is  %pM\n",
 193                                 env_enetaddr);
 194                 }
 195
 196                 memcpy(dev->enetaddr, env_enetaddr, 6);
 197         } else if (is_valid_ether_addr(dev->enetaddr)) {
 198                 eth_setenv_enetaddr_by_index(base_name, eth_number,
 199                                              dev->enetaddr);
 200                 printf("\nWarning: %s using MAC address from net device\n",
 201                         dev->name);
 202         }
 203
 204         if (dev->write_hwaddr &&
 205                         !eth_mac_skip(eth_number)) {
 206                 if (!is_valid_ether_addr(dev->enetaddr))
 207                         return -1;
 208
 209                 ret = dev->write_hwaddr(dev);
 210         }
 211
 212         return ret;
 213 }
 214
 215 int eth_register(struct eth_device *dev)
 216 {
 217         struct eth_device *d;
 218         static int index;
 219
 220         assert(strlen(dev->name) < sizeof(dev->name));
 221
 222         if (!eth_devices) {
 223                 eth_current = eth_devices = dev;
 224                 eth_current_changed();
 225         } else {
 226                 for (d = eth_devices; d->next != eth_devices; d = d->next)
 227                         ;
 228                 d->next = dev;
 229         }
 230
 231         dev->state = ETH_STATE_INIT;
 232         dev->next  = eth_devices;
 233         dev->index = index++;
 234
 235         return 0;
 236 }
 237
 238 int eth_unregister(struct eth_device *dev)
 239 {
 240         struct eth_device *cur;
 241
 242         /* No device */
 243         if (!eth_devices)
 244                 return -1;
 245
 246         for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
 247              cur = cur->next)
 248                 ;
 249
 250         /* Device not found */
 251         if (cur->next != dev)
 252                 return -1;
 253
 254         cur->next = dev->next;
 255
 256         if (eth_devices == dev)
 257                 eth_devices = dev->next == eth_devices ? NULL : dev->next;
 258
 259         if (eth_current == dev) {
 260                 eth_current = eth_devices;
 261                 eth_current_changed();
 262         }
 263
 264         return 0;
 265 }
 266
 267 static void eth_env_init(bd_t *bis)
 268 {
 269         const char *s;
 270
 271         if ((s = getenv("bootfile")) != NULL)
 272                 copy_filename(BootFile, s, sizeof(BootFile));
 273 }
 274
 275 int eth_initialize(bd_t *bis)
 276 {
 277         int num_devices = 0;
 278         eth_devices = NULL;
 279         eth_current = NULL;
 280
 281         bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
 282 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
 283         miiphy_init();
 284 #endif
 285
 286 #ifdef CONFIG_PHYLIB
 287         phy_init();
 288 #endif
 289
 290         eth_env_init(bis);
 291
 292         /*
 293          * If board-specific initialization exists, call it.
 294          * If not, call a CPU-specific one
 295          */
 296         if (board_eth_init != __def_eth_init) {
 297                 if (board_eth_init(bis) < 0)
 298                         printf("Board Net Initialization Failed\n");
 299         } else if (cpu_eth_init != __def_eth_init) {
 300                 if (cpu_eth_init(bis) < 0)
 301                         printf("CPU Net Initialization Failed\n");
 302         } else
 303                 printf("Net Initialization Skipped\n");
 304
 305         if (!eth_devices) {
 306                 puts("No ethernet found.\n");
 307                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 308         } else {
 309                 struct eth_device *dev = eth_devices;
 310                 char *ethprime = getenv("ethprime");
 311
 312                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 313                 do {
 314                         if (dev->index)
 315                                 puts(", ");
 316
 317                         printf("%s", dev->name);
 318
 319                         if (ethprime && strcmp(dev->name, ethprime) == 0) {
 320                                 eth_current = dev;
 321                                 puts(" [PRIME]");
 322                         }
 323
 324                         if (strchr(dev->name, ' '))
 325                                 puts("\nWarning: eth device name has a space!"
 326                                         "\n");
 327
 328                         if (eth_write_hwaddr(dev, "eth", dev->index))
 329                                 puts("\nWarning: failed to set MAC address\n");
 330
 331                         dev = dev->next;
 332                         num_devices++;
 333                 } while (dev != eth_devices);
 334
 335                 eth_current_changed();
 336                 putc('\n');
 337         }
 338
 339         return num_devices;
 340 }
 341
 342 #ifdef CONFIG_MCAST_TFTP
 343 /* Multicast.
 344  * mcast_addr: multicast ipaddr from which multicast Mac is made
 345  * join: 1=join, 0=leave.
 346  */
 347 int eth_mcast_join(IPaddr_t mcast_ip, u8 join)
 348 {
 349         u8 mcast_mac[6];
 350         if (!eth_current || !eth_current->mcast)
 351                 return -1;
 352         mcast_mac[5] = htonl(mcast_ip) & 0xff;
 353         mcast_mac[4] = (htonl(mcast_ip)>>8) & 0xff;
 354         mcast_mac[3] = (htonl(mcast_ip)>>16) & 0x7f;
 355         mcast_mac[2] = 0x5e;
 356         mcast_mac[1] = 0x0;
 357         mcast_mac[0] = 0x1;
 358         return eth_current->mcast(eth_current, mcast_mac, join);
 359 }
 360
 361 /* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
 362  * and this is the ethernet-crc method needed for TSEC -- and perhaps
 363  * some other adapter -- hash tables
 364  */
 365 #define CRCPOLY_LE 0xedb88320
 366 u32 ether_crc(size_t len, unsigned char const *p)
 367 {
 368         int i;
 369         u32 crc;
 370         crc = ~0;
 371         while (len--) {
 372                 crc ^= *p++;
 373                 for (i = 0; i < 8; i++)
 374                         crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
 375         }
 376         /* an reverse the bits, cuz of way they arrive -- last-first */
 377         crc = (crc >> 16) | (crc << 16);
 378         crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
 379         crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
 380         crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
 381         crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
 382         return crc;
 383 }
 384
 385 #endif
 386
 387
 388 int eth_init(bd_t *bis)
 389 {
 390         struct eth_device *old_current, *dev;
 391
 392         if (!eth_current) {
 393                 puts("No ethernet found.\n");
 394                 return -1;
 395         }
 396
 397         /* Sync environment with network devices */
 398         dev = eth_devices;
 399         do {
 400                 uchar env_enetaddr[6];
 401
 402                 if (eth_getenv_enetaddr_by_index("eth", dev->index,
 403                                                  env_enetaddr))
 404                         memcpy(dev->enetaddr, env_enetaddr, 6);
 405
 406                 dev = dev->next;
 407         } while (dev != eth_devices);
 408
 409         old_current = eth_current;
 410         do {
 411                 debug("Trying %s\n", eth_current->name);
 412
 413                 if (eth_current->init(eth_current, bis) >= 0) {
 414                         eth_current->state = ETH_STATE_ACTIVE;
 415
 416                         return 0;
 417                 }
 418                 debug("FAIL\n");
 419
 420                 eth_try_another(0);
 421         } while (old_current != eth_current);
 422
 423         return -1;
 424 }
 425
 426 void eth_halt(void)
 427 {
 428         if (!eth_current)
 429                 return;
 430
 431         eth_current->halt(eth_current);
 432
 433         eth_current->state = ETH_STATE_PASSIVE;
 434 }
 435
 436 int eth_send(void *packet, int length)
 437 {
 438         if (!eth_current)
 439                 return -1;
 440
 441         return eth_current->send(eth_current, packet, length);
 442 }
 443
 444 int eth_rx(void)
 445 {
 446         if (!eth_current)
 447                 return -1;
 448
 449         return eth_current->recv(eth_current);
 450 }
 451
 452 #ifdef CONFIG_API
 453 static void eth_save_packet(void *packet, int length)
 454 {
 455         char *p = packet;
 456         int i;
 457
 458         if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
 459                 return;
 460
 461         if (PKTSIZE < length)
 462                 return;
 463
 464         for (i = 0; i < length; i++)
 465                 eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
 466
 467         eth_rcv_bufs[eth_rcv_last].length = length;
 468         eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
 469 }
 470
 471 int eth_receive(void *packet, int length)
 472 {
 473         char *p = packet;
 474         void *pp = push_packet;
 475         int i;
 476
 477         if (eth_rcv_current == eth_rcv_last) {
 478                 push_packet = eth_save_packet;
 479                 eth_rx();
 480                 push_packet = pp;
 481
 482                 if (eth_rcv_current == eth_rcv_last)
 483                         return -1;
 484         }
 485
 486         length = min(eth_rcv_bufs[eth_rcv_current].length, length);
 487
 488         for (i = 0; i < length; i++)
 489                 p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
 490
 491         eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
 492         return length;
 493 }
 494 #endif /* CONFIG_API */
 495
 496 void eth_try_another(int first_restart)
 497 {
 498         static struct eth_device *first_failed;
 499         char *ethrotate;
 500
 501         /*
 502          * Do not rotate between network interfaces when
 503          * 'ethrotate' variable is set to 'no'.
 504          */
 505         ethrotate = getenv("ethrotate");
 506         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
 507                 return;
 508
 509         if (!eth_current)
 510                 return;
 511
 512         if (first_restart)
 513                 first_failed = eth_current;
 514
 515         eth_current = eth_current->next;
 516
 517         eth_current_changed();
 518
 519         if (first_failed == eth_current)
 520                 NetRestartWrap = 1;
 521 }
 522
 523 void eth_set_current(void)
 524 {
 525         static char *act;
 526         static int  env_changed_id;
 527         struct eth_device *old_current;
 528         int     env_id;
 529
 530         if (!eth_current)       /* XXX no current */
 531                 return;
 532
 533         env_id = get_env_id();
 534         if ((act == NULL) || (env_changed_id != env_id)) {
 535                 act = getenv("ethact");
 536                 env_changed_id = env_id;
 537         }
 538         if (act != NULL) {
 539                 old_current = eth_current;
 540                 do {
 541                         if (strcmp(eth_current->name, act) == 0)
 542                                 return;
 543                         eth_current = eth_current->next;
 544                 } while (old_current != eth_current);
 545         }
 546
 547         eth_current_changed();
 548 }
 549
 550 char *eth_get_name(void)
 551 {
 552         return eth_current ? eth_current->name : "unknown";
 553 }