net/eth-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001-2015
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  * Joe Hershberger, National Instruments
   6  */
   7
   8 #define LOG_CATEGORY UCLASS_ETH
   9
  10 #include <common.h>
  11 #include <bootdev.h>
  12 #include <bootstage.h>
  13 #include <dm.h>
  14 #include <env.h>
  15 #include <log.h>
  16 #include <net.h>
  17 #include <nvmem.h>
  18 #include <asm/global_data.h>
  19 #include <dm/device-internal.h>
  20 #include <dm/uclass-internal.h>
  21 #include <net/pcap.h>
  22 #include "eth_internal.h"
  23 #include <eth_phy.h>
  24
  25 DECLARE_GLOBAL_DATA_PTR;
  26
  27 /**
  28  * struct eth_device_priv - private structure for each Ethernet device
  29  *
  30  * @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
  31  */
  32 struct eth_device_priv {
  33         enum eth_state_t state;
  34         bool running;
  35 };
  36
  37 /**
  38  * struct eth_uclass_priv - The structure attached to the uclass itself
  39  *
  40  * @current: The Ethernet device that the network functions are using
  41  * @no_bootdevs: true to skip binding Ethernet bootdevs (this is a negative flag
  42  * so that the default value enables it)
  43  */
  44 struct eth_uclass_priv {
  45         struct udevice *current;
  46         bool no_bootdevs;
  47 };
  48
  49 /* eth_errno - This stores the most recent failure code from DM functions */
  50 static int eth_errno;
  51
  52 static struct eth_uclass_priv *eth_get_uclass_priv(void)
  53 {
  54         struct uclass *uc;
  55         int ret;
  56
  57         ret = uclass_get(UCLASS_ETH, &uc);
  58         if (ret)
  59                 return NULL;
  60
  61         assert(uc);
  62         return uclass_get_priv(uc);
  63 }
  64
  65 void eth_set_enable_bootdevs(bool enable)
  66 {
  67         struct eth_uclass_priv *priv = eth_get_uclass_priv();
  68
  69         if (priv)
  70                 priv->no_bootdevs = !enable;
  71 }
  72
  73 void eth_set_current_to_next(void)
  74 {
  75         struct eth_uclass_priv *uc_priv;
  76
  77         uc_priv = eth_get_uclass_priv();
  78         if (uc_priv->current)
  79                 uclass_next_device(&uc_priv->current);
  80         if (!uc_priv->current)
  81                 uclass_first_device(UCLASS_ETH, &uc_priv->current);
  82 }
  83
  84 /*
  85  * Typically this will simply return the active device.
  86  * In the case where the most recent active device was unset, this will attempt
  87  * to return the device with sequence id 0 (which can be configured by the
  88  * device tree). If this fails, fall back to just getting the first device.
  89  * The latter is non-deterministic and depends on the order of the probing.
  90  * If that device doesn't exist or fails to probe, this function will return
  91  * NULL.
  92  */
  93 struct udevice *eth_get_dev(void)
  94 {
  95         struct eth_uclass_priv *uc_priv;
  96
  97         uc_priv = eth_get_uclass_priv();
  98         if (!uc_priv)
  99                 return NULL;
 100
 101         if (!uc_priv->current) {
 102                 eth_errno = uclass_get_device_by_seq(UCLASS_ETH, 0,
 103                                                      &uc_priv->current);
 104                 if (eth_errno)
 105                         eth_errno = uclass_first_device_err(UCLASS_ETH,
 106                                                             &uc_priv->current);
 107                 if (eth_errno)
 108                         uc_priv->current = NULL;
 109         }
 110         return uc_priv->current;
 111 }
 112
 113 /*
 114  * Typically this will just store a device pointer.
 115  * In case it was not probed, we will attempt to do so.
 116  * dev may be NULL to unset the active device.
 117  */
 118 void eth_set_dev(struct udevice *dev)
 119 {
 120         if (dev && !device_active(dev)) {
 121                 eth_errno = device_probe(dev);
 122                 if (eth_errno)
 123                         dev = NULL;
 124         }
 125
 126         eth_get_uclass_priv()->current = dev;
 127 }
 128
 129 /*
 130  * Find the udevice that either has the name passed in as devname or has an
 131  * alias named devname.
 132  */
 133 struct udevice *eth_get_dev_by_name(const char *devname)
 134 {
 135         int seq = -1;
 136         char *endp = NULL;
 137         const char *startp = NULL;
 138         struct udevice *it;
 139         struct uclass *uc;
 140         int len = strlen("eth");
 141         int ret;
 142
 143         /* Must be longer than 3 to be an alias */
 144         if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
 145                 startp = devname + len;
 146                 seq = dectoul(startp, &endp);
 147         }
 148
 149         ret = uclass_get(UCLASS_ETH, &uc);
 150         if (ret)
 151                 return NULL;
 152
 153         uclass_foreach_dev(it, uc) {
 154                 /*
 155                  * We don't care about errors from probe here. Either they won't
 156                  * match an alias or it will match a literal name and we'll pick
 157                  * up the error when we try to probe again in eth_set_dev().
 158                  */
 159                 if (device_probe(it))
 160                         continue;
 161                 /* Check for the name or the sequence number to match */
 162                 if (strcmp(it->name, devname) == 0 ||
 163                     (endp > startp && dev_seq(it) == seq))
 164                         return it;
 165         }
 166
 167         return NULL;
 168 }
 169
 170 unsigned char *eth_get_ethaddr(void)
 171 {
 172         struct eth_pdata *pdata;
 173
 174         if (eth_get_dev()) {
 175                 pdata = dev_get_plat(eth_get_dev());
 176                 return pdata->enetaddr;
 177         }
 178
 179         return NULL;
 180 }
 181
 182 /* Set active state without calling start on the driver */
 183 int eth_init_state_only(void)
 184 {
 185         struct udevice *current;
 186         struct eth_device_priv *priv;
 187
 188         current = eth_get_dev();
 189         if (!current || !device_active(current))
 190                 return -EINVAL;
 191
 192         priv = dev_get_uclass_priv(current);
 193         priv->state = ETH_STATE_ACTIVE;
 194
 195         return 0;
 196 }
 197
 198 /* Set passive state without calling stop on the driver */
 199 void eth_halt_state_only(void)
 200 {
 201         struct udevice *current;
 202         struct eth_device_priv *priv;
 203
 204         current = eth_get_dev();
 205         if (!current || !device_active(current))
 206                 return;
 207
 208         priv = dev_get_uclass_priv(current);
 209         priv->state = ETH_STATE_PASSIVE;
 210 }
 211
 212 int eth_get_dev_index(void)
 213 {
 214         if (eth_get_dev())
 215                 return dev_seq(eth_get_dev());
 216         return -1;
 217 }
 218
 219 static int eth_write_hwaddr(struct udevice *dev)
 220 {
 221         struct eth_pdata *pdata;
 222         int ret = 0;
 223
 224         if (!dev || !device_active(dev))
 225                 return -EINVAL;
 226
 227         /* seq is valid since the device is active */
 228         if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev_seq(dev))) {
 229                 pdata = dev_get_plat(dev);
 230                 if (!is_valid_ethaddr(pdata->enetaddr)) {
 231                         printf("\nError: %s address %pM illegal value\n",
 232                                dev->name, pdata->enetaddr);
 233                         return -EINVAL;
 234                 }
 235
 236                 /*
 237                  * Drivers are allowed to decide not to implement this at
 238                  * run-time. E.g. Some devices may use it and some may not.
 239                  */
 240                 ret = eth_get_ops(dev)->write_hwaddr(dev);
 241                 if (ret == -ENOSYS)
 242                         ret = 0;
 243                 if (ret)
 244                         printf("\nWarning: %s failed to set MAC address\n",
 245                                dev->name);
 246         }
 247
 248         return ret;
 249 }
 250
 251 static int on_ethaddr(const char *name, const char *value, enum env_op op,
 252         int flags)
 253 {
 254         int index;
 255         int retval;
 256         struct udevice *dev;
 257
 258         /* look for an index after "eth" */
 259         index = dectoul(name + 3, NULL);
 260
 261         retval = uclass_find_device_by_seq(UCLASS_ETH, index, &dev);
 262         if (!retval) {
 263                 struct eth_pdata *pdata = dev_get_plat(dev);
 264                 switch (op) {
 265                 case env_op_create:
 266                 case env_op_overwrite:
 267                         string_to_enetaddr(value, pdata->enetaddr);
 268                         eth_write_hwaddr(dev);
 269                         break;
 270                 case env_op_delete:
 271                         memset(pdata->enetaddr, 0, ARP_HLEN);
 272                 }
 273         }
 274
 275         return 0;
 276 }
 277 U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
 278
 279 int eth_init(void)
 280 {
 281         char *ethact = env_get("ethact");
 282         char *ethrotate = env_get("ethrotate");
 283         struct udevice *current = NULL;
 284         struct udevice *old_current;
 285         int ret = -ENODEV;
 286
 287         /*
 288          * When 'ethrotate' variable is set to 'no' and 'ethact' variable
 289          * is already set to an ethernet device, we should stick to 'ethact'.
 290          */
 291         if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0)) {
 292                 if (ethact) {
 293                         current = eth_get_dev_by_name(ethact);
 294                         if (!current)
 295                                 return -EINVAL;
 296                 }
 297         }
 298
 299         if (!current) {
 300                 current = eth_get_dev();
 301                 if (!current) {
 302                         log_err("No ethernet found.\n");
 303                         return -ENODEV;
 304                 }
 305         }
 306
 307         old_current = current;
 308         do {
 309                 if (current) {
 310                         debug("Trying %s\n", current->name);
 311
 312                         if (device_active(current)) {
 313                                 ret = eth_get_ops(current)->start(current);
 314                                 if (ret >= 0) {
 315                                         struct eth_device_priv *priv =
 316                                                 dev_get_uclass_priv(current);
 317
 318                                         priv->state = ETH_STATE_ACTIVE;
 319                                         priv->running = true;
 320                                         return 0;
 321                                 }
 322                         } else {
 323                                 ret = eth_errno;
 324                         }
 325
 326                         debug("FAIL\n");
 327                 } else {
 328                         debug("PROBE FAIL\n");
 329                 }
 330
 331                 /*
 332                  * If ethrotate is enabled, this will change "current",
 333                  * otherwise we will drop out of this while loop immediately
 334                  */
 335                 eth_try_another(0);
 336                 /* This will ensure the new "current" attempted to probe */
 337                 current = eth_get_dev();
 338         } while (old_current != current);
 339
 340         return ret;
 341 }
 342
 343 void eth_halt(void)
 344 {
 345         struct udevice *current;
 346         struct eth_device_priv *priv;
 347
 348         current = eth_get_dev();
 349         if (!current)
 350                 return;
 351
 352         priv = dev_get_uclass_priv(current);
 353         if (!priv || !priv->running)
 354                 return;
 355
 356         eth_get_ops(current)->stop(current);
 357         priv->state = ETH_STATE_PASSIVE;
 358         priv->running = false;
 359 }
 360
 361 int eth_is_active(struct udevice *dev)
 362 {
 363         struct eth_device_priv *priv;
 364
 365         if (!dev || !device_active(dev))
 366                 return 0;
 367
 368         priv = dev_get_uclass_priv(dev);
 369         return priv->state == ETH_STATE_ACTIVE;
 370 }
 371
 372 int eth_send(void *packet, int length)
 373 {
 374         struct udevice *current;
 375         int ret;
 376
 377         current = eth_get_dev();
 378         if (!current)
 379                 return -ENODEV;
 380
 381         if (!eth_is_active(current))
 382                 return -EINVAL;
 383
 384         ret = eth_get_ops(current)->send(current, packet, length);
 385         if (ret < 0) {
 386                 /* We cannot completely return the error at present */
 387                 debug("%s: send() returned error %d\n", __func__, ret);
 388         }
 389 #if defined(CONFIG_CMD_PCAP)
 390         if (ret >= 0)
 391                 pcap_post(packet, length, true);
 392 #endif
 393         return ret;
 394 }
 395
 396 int eth_rx(void)
 397 {
 398         struct udevice *current;
 399         uchar *packet;
 400         int flags;
 401         int ret;
 402         int i;
 403
 404         current = eth_get_dev();
 405         if (!current)
 406                 return -ENODEV;
 407
 408         if (!eth_is_active(current))
 409                 return -EINVAL;
 410
 411         /* Process up to 32 packets at one time */
 412         flags = ETH_RECV_CHECK_DEVICE;
 413         for (i = 0; i < ETH_PACKETS_BATCH_RECV; i++) {
 414                 ret = eth_get_ops(current)->recv(current, flags, &packet);
 415                 flags = 0;
 416                 if (ret > 0)
 417                         net_process_received_packet(packet, ret);
 418                 if (ret >= 0 && eth_get_ops(current)->free_pkt)
 419                         eth_get_ops(current)->free_pkt(current, packet, ret);
 420                 if (ret <= 0)
 421                         break;
 422         }
 423         if (ret == -EAGAIN)
 424                 ret = 0;
 425         if (ret < 0) {
 426                 /* We cannot completely return the error at present */
 427                 debug("%s: recv() returned error %d\n", __func__, ret);
 428         }
 429         return ret;
 430 }
 431
 432 int eth_initialize(void)
 433 {
 434         int num_devices = 0;
 435         struct udevice *dev;
 436
 437         eth_common_init();
 438
 439         /*
 440          * Devices need to write the hwaddr even if not started so that Linux
 441          * will have access to the hwaddr that u-boot stored for the device.
 442          * This is accomplished by attempting to probe each device and calling
 443          * their write_hwaddr() operation.
 444          */
 445         uclass_first_device_check(UCLASS_ETH, &dev);
 446         if (!dev) {
 447                 log_err("No ethernet found.\n");
 448                 bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
 449         } else {
 450                 char *ethprime = env_get("ethprime");
 451                 struct udevice *prime_dev = NULL;
 452
 453                 if (ethprime)
 454                         prime_dev = eth_get_dev_by_name(ethprime);
 455                 if (prime_dev) {
 456                         eth_set_dev(prime_dev);
 457                         eth_current_changed();
 458                 } else {
 459                         eth_set_dev(NULL);
 460                 }
 461
 462                 bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
 463                 do {
 464                         if (device_active(dev)) {
 465                                 if (num_devices)
 466                                         printf(", ");
 467
 468                                 printf("eth%d: %s", dev_seq(dev), dev->name);
 469
 470                                 if (ethprime && dev == prime_dev)
 471                                         printf(" [PRIME]");
 472                         }
 473
 474                         eth_write_hwaddr(dev);
 475
 476                         if (device_active(dev))
 477                                 num_devices++;
 478                         uclass_next_device_check(&dev);
 479                 } while (dev);
 480
 481                 if (!num_devices)
 482                         log_err("No ethernet found.\n");
 483                 putc('\n');
 484         }
 485
 486         return num_devices;
 487 }
 488
 489 static int eth_post_bind(struct udevice *dev)
 490 {
 491         struct eth_uclass_priv *priv = uclass_get_priv(dev->uclass);
 492         int ret;
 493
 494         if (strchr(dev->name, ' ')) {
 495                 printf("\nError: eth device name \"%s\" has a space!\n",
 496                        dev->name);
 497                 return -EINVAL;
 498         }
 499
 500 #ifdef CONFIG_DM_ETH_PHY
 501         eth_phy_binds_nodes(dev);
 502 #endif
 503         if (CONFIG_IS_ENABLED(BOOTDEV_ETH) && !priv->no_bootdevs) {
 504                 ret = bootdev_setup_for_dev(dev, "eth_bootdev");
 505                 if (ret)
 506                         return log_msg_ret("bootdev", ret);
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int eth_pre_unbind(struct udevice *dev)
 513 {
 514         /* Don't hang onto a pointer that is going away */
 515         if (dev == eth_get_uclass_priv()->current)
 516                 eth_set_dev(NULL);
 517
 518         return 0;
 519 }
 520
 521 static bool eth_dev_get_mac_address(struct udevice *dev, u8 mac[ARP_HLEN])
 522 {
 523 #if CONFIG_IS_ENABLED(OF_CONTROL)
 524         const uint8_t *p;
 525         struct nvmem_cell mac_cell;
 526
 527         p = dev_read_u8_array_ptr(dev, "mac-address", ARP_HLEN);
 528         if (!p)
 529                 p = dev_read_u8_array_ptr(dev, "local-mac-address", ARP_HLEN);
 530
 531         if (p) {
 532                 memcpy(mac, p, ARP_HLEN);
 533                 return true;
 534         }
 535
 536         if (nvmem_cell_get_by_name(dev, "mac-address", &mac_cell))
 537                 return false;
 538
 539         return !nvmem_cell_read(&mac_cell, mac, ARP_HLEN);
 540 #else
 541         return false;
 542 #endif
 543 }
 544
 545 static int eth_post_probe(struct udevice *dev)
 546 {
 547         struct eth_device_priv *priv = dev_get_uclass_priv(dev);
 548         struct eth_pdata *pdata = dev_get_plat(dev);
 549         unsigned char env_enetaddr[ARP_HLEN];
 550         char *source = "DT";
 551
 552 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
 553         struct eth_ops *ops = eth_get_ops(dev);
 554         static int reloc_done;
 555
 556         if (!reloc_done) {
 557                 if (ops->start)
 558                         ops->start += gd->reloc_off;
 559                 if (ops->send)
 560                         ops->send += gd->reloc_off;
 561                 if (ops->recv)
 562                         ops->recv += gd->reloc_off;
 563                 if (ops->free_pkt)
 564                         ops->free_pkt += gd->reloc_off;
 565                 if (ops->stop)
 566                         ops->stop += gd->reloc_off;
 567                 if (ops->mcast)
 568                         ops->mcast += gd->reloc_off;
 569                 if (ops->write_hwaddr)
 570                         ops->write_hwaddr += gd->reloc_off;
 571                 if (ops->read_rom_hwaddr)
 572                         ops->read_rom_hwaddr += gd->reloc_off;
 573
 574                 reloc_done++;
 575         }
 576 #endif
 577
 578         priv->state = ETH_STATE_INIT;
 579         priv->running = false;
 580
 581         /* Check if the device has a valid MAC address in device tree */
 582         if (!eth_dev_get_mac_address(dev, pdata->enetaddr) ||
 583             !is_valid_ethaddr(pdata->enetaddr)) {
 584                 source = "ROM";
 585                 /* Check if the device has a MAC address in ROM */
 586                 if (eth_get_ops(dev)->read_rom_hwaddr)
 587                         eth_get_ops(dev)->read_rom_hwaddr(dev);
 588         }
 589
 590         eth_env_get_enetaddr_by_index("eth", dev_seq(dev), env_enetaddr);
 591         if (!is_zero_ethaddr(env_enetaddr)) {
 592                 if (!is_zero_ethaddr(pdata->enetaddr) &&
 593                     memcmp(pdata->enetaddr, env_enetaddr, ARP_HLEN)) {
 594                         printf("\nWarning: %s MAC addresses don't match:\n",
 595                                dev->name);
 596                         printf("Address in %s is\t\t%pM\n",
 597                                source, pdata->enetaddr);
 598                         printf("Address in environment is\t%pM\n",
 599                                env_enetaddr);
 600                 }
 601
 602                 /* Override the ROM MAC address */
 603                 memcpy(pdata->enetaddr, env_enetaddr, ARP_HLEN);
 604         } else if (is_valid_ethaddr(pdata->enetaddr)) {
 605                 eth_env_set_enetaddr_by_index("eth", dev_seq(dev),
 606                                               pdata->enetaddr);
 607         } else if (is_zero_ethaddr(pdata->enetaddr) ||
 608                    !is_valid_ethaddr(pdata->enetaddr)) {
 609 #ifdef CONFIG_NET_RANDOM_ETHADDR
 610                 net_random_ethaddr(pdata->enetaddr);
 611                 printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
 612                        dev->name, dev_seq(dev), pdata->enetaddr);
 613                 eth_env_set_enetaddr_by_index("eth", dev_seq(dev),
 614                                               pdata->enetaddr);
 615 #else
 616                 printf("\nError: %s address not set.\n",
 617                        dev->name);
 618                 return -EINVAL;
 619 #endif
 620         }
 621
 622         eth_write_hwaddr(dev);
 623
 624         return 0;
 625 }
 626
 627 static int eth_pre_remove(struct udevice *dev)
 628 {
 629         struct eth_pdata *pdata = dev_get_plat(dev);
 630
 631         eth_get_ops(dev)->stop(dev);
 632
 633         /* clear the MAC address */
 634         memset(pdata->enetaddr, 0, ARP_HLEN);
 635
 636         return 0;
 637 }
 638
 639 UCLASS_DRIVER(ethernet) = {
 640         .name           = "ethernet",
 641         .id             = UCLASS_ETH,
 642         .post_bind      = eth_post_bind,
 643         .pre_unbind     = eth_pre_unbind,
 644         .post_probe     = eth_post_probe,
 645         .pre_remove     = eth_pre_remove,
 646         .priv_auto      = sizeof(struct eth_uclass_priv),
 647         .per_device_auto        = sizeof(struct eth_device_priv),
 648         .flags          = DM_UC_FLAG_SEQ_ALIAS,
 649 };