arch/xtensa/platforms/iss/network.c

   1 /*
   2  *
   3  * arch/xtensa/platforms/iss/network.c
   4  *
   5  * Platform specific initialization.
   6  *
   7  * Authors: Chris Zankel <chris@zankel.net>
   8  * Based on work form the UML team.
   9  *
  10  * Copyright 2005 Tensilica Inc.
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18
  19 #include <linux/list.h>
  20 #include <linux/irq.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/slab.h>
  23 #include <linux/timer.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/inetdevice.h>
  26 #include <linux/init.h>
  27 #include <linux/if_tun.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/ioctl.h>
  31 #include <linux/bootmem.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/platform_device.h>
  35
  36 #include <platform/simcall.h>
  37
  38 #define DRIVER_NAME "iss-netdev"
  39 #define ETH_MAX_PACKET 1500
  40 #define ETH_HEADER_OTHER 14
  41 #define ISS_NET_TIMER_VALUE (2 * HZ)
  42
  43
  44 static DEFINE_SPINLOCK(opened_lock);
  45 static LIST_HEAD(opened);
  46
  47 static DEFINE_SPINLOCK(devices_lock);
  48 static LIST_HEAD(devices);
  49
  50 /* ------------------------------------------------------------------------- */
  51
  52 /* We currently only support the TUNTAP transport protocol. */
  53
  54 #define TRANSPORT_TUNTAP_NAME "tuntap"
  55 #define TRANSPORT_TUNTAP_MTU ETH_MAX_PACKET
  56
  57 struct tuntap_info {
  58         char dev_name[IFNAMSIZ];
  59         int fixed_config;
  60         unsigned char gw[ETH_ALEN];
  61         int fd;
  62 };
  63
  64 /* ------------------------------------------------------------------------- */
  65
  66
  67 /* This structure contains out private information for the driver. */
  68
  69 struct iss_net_private {
  70
  71         struct list_head device_list;
  72         struct list_head opened_list;
  73
  74         spinlock_t lock;
  75         struct net_device *dev;
  76         struct platform_device pdev;
  77         struct timer_list tl;
  78         struct net_device_stats stats;
  79
  80         struct timer_list timer;
  81         unsigned int timer_val;
  82
  83         int index;
  84         int mtu;
  85
  86         unsigned char mac[ETH_ALEN];
  87         int have_mac;
  88
  89         struct {
  90                 union {
  91                         struct tuntap_info tuntap;
  92                 } info;
  93
  94                 int (*open)(struct iss_net_private *lp);
  95                 void (*close)(struct iss_net_private *lp);
  96                 int (*read)(struct iss_net_private *lp, struct sk_buff **skb);
  97                 int (*write)(struct iss_net_private *lp, struct sk_buff **skb);
  98                 unsigned short (*protocol)(struct sk_buff *skb);
  99                 int (*poll)(struct iss_net_private *lp);
 100         } tp;
 101
 102 };
 103
 104 /* ================================ HELPERS ================================ */
 105
 106
 107 static char *split_if_spec(char *str, ...)
 108 {
 109         char **arg, *end;
 110         va_list ap;
 111
 112         va_start(ap, str);
 113         while ((arg = va_arg(ap, char**)) != NULL) {
 114                 if (*str == '\0')
 115                         return NULL;
 116                 end = strchr(str, ',');
 117                 if (end != str)
 118                         *arg = str;
 119                 if (end == NULL)
 120                         return NULL;
 121                 *end ++ = '\0';
 122                 str = end;
 123         }
 124         va_end(ap);
 125         return str;
 126 }
 127
 128
 129 #if 0
 130 /* Adjust SKB. */
 131
 132 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
 133 {
 134         if ((skb != NULL) && (skb_tailroom(skb) < extra)) {
 135                 struct sk_buff *skb2;
 136
 137                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
 138                 dev_kfree_skb(skb);
 139                 skb = skb2;
 140         }
 141         if (skb != NULL)
 142                 skb_put(skb, extra);
 143
 144         return skb;
 145 }
 146 #endif
 147
 148 /* Return the IP address as a string for a given device. */
 149
 150 static void dev_ip_addr(void *d, char *buf, char *bin_buf)
 151 {
 152         struct net_device *dev = d;
 153         struct in_device *ip = dev->ip_ptr;
 154         struct in_ifaddr *in;
 155         __be32 addr;
 156
 157         if ((ip == NULL) || ((in = ip->ifa_list) == NULL)) {
 158                 printk(KERN_WARNING "Device not assigned an IP address!\n");
 159                 return;
 160         }
 161
 162         addr = in->ifa_address;
 163         sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff,
 164                 (addr >> 16) & 0xff, addr >> 24);
 165
 166         if (bin_buf) {
 167                 bin_buf[0] = addr & 0xff;
 168                 bin_buf[1] = (addr >> 8) & 0xff;
 169                 bin_buf[2] = (addr >> 16) & 0xff;
 170                 bin_buf[3] = addr >> 24;
 171         }
 172 }
 173
 174 /* Set Ethernet address of the specified device. */
 175
 176 static void inline set_ether_mac(void *d, unsigned char *addr)
 177 {
 178         struct net_device *dev = d;
 179         memcpy(dev->dev_addr, addr, ETH_ALEN);
 180 }
 181
 182
 183 /* ======================= TUNTAP TRANSPORT INTERFACE ====================== */
 184
 185 static int tuntap_open(struct iss_net_private *lp)
 186 {
 187         struct ifreq ifr;
 188         char *dev_name = lp->tp.info.tuntap.dev_name;
 189         int err = -EINVAL;
 190         int fd;
 191
 192         /* We currently only support a fixed configuration. */
 193
 194         if (!lp->tp.info.tuntap.fixed_config)
 195                 return -EINVAL;
 196
 197         if ((fd = simc_open("/dev/net/tun", 02, 0)) < 0) {      /* O_RDWR */
 198                 printk("Failed to open /dev/net/tun, returned %d "
 199                        "(errno = %d)\n", fd, errno);
 200                 return fd;
 201         }
 202
 203         memset(&ifr, 0, sizeof ifr);
 204         ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
 205         strlcpy(ifr.ifr_name, dev_name, sizeof ifr.ifr_name);
 206
 207         if ((err = simc_ioctl(fd, TUNSETIFF, (void*) &ifr)) < 0) {
 208                 printk("Failed to set interface, returned %d "
 209                        "(errno = %d)\n", err, errno);
 210                 simc_close(fd);
 211                 return err;
 212         }
 213
 214         lp->tp.info.tuntap.fd = fd;
 215         return err;
 216 }
 217
 218 static void tuntap_close(struct iss_net_private *lp)
 219 {
 220 #if 0
 221         if (lp->tp.info.tuntap.fixed_config)
 222                 iter_addresses(lp->tp.info.tuntap.dev, close_addr, lp->host.dev_name);
 223 #endif
 224         simc_close(lp->tp.info.tuntap.fd);
 225         lp->tp.info.tuntap.fd = -1;
 226 }
 227
 228 static int tuntap_read (struct iss_net_private *lp, struct sk_buff **skb)
 229 {
 230 #if 0
 231         *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
 232         if (*skb == NULL)
 233                 return -ENOMEM;
 234 #endif
 235
 236         return simc_read(lp->tp.info.tuntap.fd,
 237                         (*skb)->data, (*skb)->dev->mtu + ETH_HEADER_OTHER);
 238 }
 239
 240 static int tuntap_write (struct iss_net_private *lp, struct sk_buff **skb)
 241 {
 242         return simc_write(lp->tp.info.tuntap.fd, (*skb)->data, (*skb)->len);
 243 }
 244
 245 unsigned short tuntap_protocol(struct sk_buff *skb)
 246 {
 247         return eth_type_trans(skb, skb->dev);
 248 }
 249
 250 static int tuntap_poll(struct iss_net_private *lp)
 251 {
 252         return simc_poll(lp->tp.info.tuntap.fd);
 253 }
 254
 255 /*
 256  * Currently only a device name is supported.
 257  * ethX=tuntap[,[mac address][,[device name]]]
 258  */
 259
 260 static int tuntap_probe(struct iss_net_private *lp, int index, char *init)
 261 {
 262         const int len = strlen(TRANSPORT_TUNTAP_NAME);
 263         char *dev_name = NULL, *mac_str = NULL, *rem = NULL;
 264
 265         /* Transport should be 'tuntap': ethX=tuntap,mac,dev_name */
 266
 267         if (strncmp(init, TRANSPORT_TUNTAP_NAME, len))
 268                 return 0;
 269
 270         if (*(init += strlen(TRANSPORT_TUNTAP_NAME)) == ',') {
 271                 if ((rem=split_if_spec(init+1, &mac_str, &dev_name)) != NULL) {
 272                         printk("Extra garbage on specification : '%s'\n", rem);
 273                         return 0;
 274                 }
 275         } else if (*init != '\0') {
 276                 printk("Invalid argument: %s. Skipping device!\n", init);
 277                 return 0;
 278         }
 279
 280         if (dev_name) {
 281                 strncpy(lp->tp.info.tuntap.dev_name, dev_name,
 282                          sizeof lp->tp.info.tuntap.dev_name);
 283                 lp->tp.info.tuntap.fixed_config = 1;
 284         } else
 285                 strcpy(lp->tp.info.tuntap.dev_name, TRANSPORT_TUNTAP_NAME);
 286
 287
 288 #if 0
 289         if (setup_etheraddr(mac_str, lp->mac))
 290                 lp->have_mac = 1;
 291 #endif
 292         lp->mtu = TRANSPORT_TUNTAP_MTU;
 293
 294         //lp->info.tuntap.gate_addr = gate_addr;
 295
 296         lp->tp.info.tuntap.fd = -1;
 297
 298         lp->tp.open = tuntap_open;
 299         lp->tp.close = tuntap_close;
 300         lp->tp.read = tuntap_read;
 301         lp->tp.write = tuntap_write;
 302         lp->tp.protocol = tuntap_protocol;
 303         lp->tp.poll = tuntap_poll;
 304
 305         printk("TUN/TAP backend - ");
 306 #if 0
 307         if (lp->host.gate_addr != NULL)
 308                 printk("IP = %s", lp->host.gate_addr);
 309 #endif
 310         printk("\n");
 311
 312         return 1;
 313 }
 314
 315 /* ================================ ISS NET ================================ */
 316
 317 static int iss_net_rx(struct net_device *dev)
 318 {
 319         struct iss_net_private *lp = netdev_priv(dev);
 320         int pkt_len;
 321         struct sk_buff *skb;
 322
 323         /* Check if there is any new data. */
 324
 325         if (lp->tp.poll(lp) == 0)
 326                 return 0;
 327
 328         /* Try to allocate memory, if it fails, try again next round. */
 329
 330         if ((skb = dev_alloc_skb(dev->mtu + 2 + ETH_HEADER_OTHER)) == NULL) {
 331                 lp->stats.rx_dropped++;
 332                 return 0;
 333         }
 334
 335         skb_reserve(skb, 2);
 336
 337         /* Setup skb */
 338
 339         skb->dev = dev;
 340         skb_reset_mac_header(skb);
 341         pkt_len = lp->tp.read(lp, &skb);
 342         skb_put(skb, pkt_len);
 343
 344         if (pkt_len > 0) {
 345                 skb_trim(skb, pkt_len);
 346                 skb->protocol = lp->tp.protocol(skb);
 347
 348                 lp->stats.rx_bytes += skb->len;
 349                 lp->stats.rx_packets++;
 350         //      netif_rx(skb);
 351                 netif_rx_ni(skb);
 352                 return pkt_len;
 353         }
 354         kfree_skb(skb);
 355         return pkt_len;
 356 }
 357
 358 static int iss_net_poll(void)
 359 {
 360         struct list_head *ele;
 361         int err, ret = 0;
 362
 363         spin_lock(&opened_lock);
 364
 365         list_for_each(ele, &opened) {
 366                 struct iss_net_private *lp;
 367
 368                 lp = list_entry(ele, struct iss_net_private, opened_list);
 369
 370                 if (!netif_running(lp->dev))
 371                         break;
 372
 373                 spin_lock(&lp->lock);
 374
 375                 while ((err = iss_net_rx(lp->dev)) > 0)
 376                         ret++;
 377
 378                 spin_unlock(&lp->lock);
 379
 380                 if (err < 0) {
 381                         printk(KERN_ERR "Device '%s' read returned %d, "
 382                                "shutting it down\n", lp->dev->name, err);
 383                         dev_close(lp->dev);
 384                 } else {
 385                         // FIXME reactivate_fd(lp->fd, ISS_ETH_IRQ);
 386                 }
 387         }
 388
 389         spin_unlock(&opened_lock);
 390         return ret;
 391 }
 392
 393
 394 static void iss_net_timer(unsigned long priv)
 395 {
 396         struct iss_net_private* lp = (struct iss_net_private*) priv;
 397
 398         spin_lock(&lp->lock);
 399
 400         iss_net_poll();
 401
 402         mod_timer(&lp->timer, jiffies + lp->timer_val);
 403
 404         spin_unlock(&lp->lock);
 405 }
 406
 407
 408 static int iss_net_open(struct net_device *dev)
 409 {
 410         struct iss_net_private *lp = netdev_priv(dev);
 411         char addr[sizeof "255.255.255.255\0"];
 412         int err;
 413
 414         spin_lock(&lp->lock);
 415
 416         if ((err = lp->tp.open(lp)) < 0)
 417                 goto out;
 418
 419         if (!lp->have_mac) {
 420                 dev_ip_addr(dev, addr, &lp->mac[2]);
 421                 set_ether_mac(dev, lp->mac);
 422         }
 423
 424         netif_start_queue(dev);
 425
 426         /* clear buffer - it can happen that the host side of the interface
 427          * is full when we get here. In this case, new data is never queued,
 428          * SIGIOs never arrive, and the net never works.
 429          */
 430         while ((err = iss_net_rx(dev)) > 0)
 431                 ;
 432
 433         spin_lock(&opened_lock);
 434         list_add(&lp->opened_list, &opened);
 435         spin_unlock(&opened_lock);
 436
 437         init_timer(&lp->timer);
 438         lp->timer_val = ISS_NET_TIMER_VALUE;
 439         lp->timer.data = (unsigned long) lp;
 440         lp->timer.function = iss_net_timer;
 441         mod_timer(&lp->timer, jiffies + lp->timer_val);
 442
 443 out:
 444         spin_unlock(&lp->lock);
 445         return err;
 446 }
 447
 448 static int iss_net_close(struct net_device *dev)
 449 {
 450         struct iss_net_private *lp = netdev_priv(dev);
 451 printk("iss_net_close!\n");
 452         netif_stop_queue(dev);
 453         spin_lock(&lp->lock);
 454
 455         spin_lock(&opened_lock);
 456         list_del(&opened);
 457         spin_unlock(&opened_lock);
 458
 459         del_timer_sync(&lp->timer);
 460
 461         lp->tp.close(lp);
 462
 463         spin_unlock(&lp->lock);
 464         return 0;
 465 }
 466
 467 static int iss_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
 468 {
 469         struct iss_net_private *lp = netdev_priv(dev);
 470         unsigned long flags;
 471         int len;
 472
 473         netif_stop_queue(dev);
 474         spin_lock_irqsave(&lp->lock, flags);
 475
 476         len = lp->tp.write(lp, &skb);
 477
 478         if (len == skb->len) {
 479                 lp->stats.tx_packets++;
 480                 lp->stats.tx_bytes += skb->len;
 481                 dev->trans_start = jiffies;
 482                 netif_start_queue(dev);
 483
 484                 /* this is normally done in the interrupt when tx finishes */
 485                 netif_wake_queue(dev);
 486
 487         } else if (len == 0) {
 488                 netif_start_queue(dev);
 489                 lp->stats.tx_dropped++;
 490
 491         } else {
 492                 netif_start_queue(dev);
 493                 printk(KERN_ERR "iss_net_start_xmit: failed(%d)\n", len);
 494         }
 495
 496         spin_unlock_irqrestore(&lp->lock, flags);
 497
 498         dev_kfree_skb(skb);
 499         return NETDEV_TX_OK;
 500 }
 501
 502
 503 static struct net_device_stats *iss_net_get_stats(struct net_device *dev)
 504 {
 505         struct iss_net_private *lp = netdev_priv(dev);
 506         return &lp->stats;
 507 }
 508
 509 static void iss_net_set_multicast_list(struct net_device *dev)
 510 {
 511 #if 0
 512         if (dev->flags & IFF_PROMISC)
 513                 return;
 514         else if (!netdev_mc_empty(dev))
 515                 dev->flags |= IFF_ALLMULTI;
 516         else
 517                 dev->flags &= ~IFF_ALLMULTI;
 518 #endif
 519 }
 520
 521 static void iss_net_tx_timeout(struct net_device *dev)
 522 {
 523 #if 0
 524         dev->trans_start = jiffies;
 525         netif_wake_queue(dev);
 526 #endif
 527 }
 528
 529 static int iss_net_set_mac(struct net_device *dev, void *addr)
 530 {
 531 #if 0
 532         struct iss_net_private *lp = netdev_priv(dev);
 533         struct sockaddr *hwaddr = addr;
 534
 535         spin_lock(&lp->lock);
 536         memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
 537         spin_unlock(&lp->lock);
 538 #endif
 539
 540         return 0;
 541 }
 542
 543 static int iss_net_change_mtu(struct net_device *dev, int new_mtu)
 544 {
 545 #if 0
 546         struct iss_net_private *lp = netdev_priv(dev);
 547         int err = 0;
 548
 549         spin_lock(&lp->lock);
 550
 551         // FIXME not needed new_mtu = transport_set_mtu(new_mtu, &lp->user);
 552
 553         if (new_mtu < 0)
 554                 err = new_mtu;
 555         else
 556                 dev->mtu = new_mtu;
 557
 558         spin_unlock(&lp->lock);
 559         return err;
 560 #endif
 561         return -EINVAL;
 562 }
 563
 564 void iss_net_user_timer_expire(unsigned long _conn)
 565 {
 566 }
 567
 568
 569 static struct platform_driver iss_net_driver = {
 570         .driver = {
 571                 .name  = DRIVER_NAME,
 572         },
 573 };
 574
 575 static int driver_registered;
 576
 577 static const struct net_device_ops iss_netdev_ops = {
 578         .ndo_open               = iss_net_open,
 579         .ndo_stop               = iss_net_close,
 580         .ndo_get_stats          = iss_net_get_stats,
 581         .ndo_start_xmit         = iss_net_start_xmit,
 582         .ndo_validate_addr      = eth_validate_addr,
 583         .ndo_change_mtu         = iss_net_change_mtu,
 584         .ndo_set_mac_address    = iss_net_set_mac,
 585         //.ndo_do_ioctl         = iss_net_ioctl,
 586         .ndo_tx_timeout         = iss_net_tx_timeout,
 587         .ndo_set_rx_mode        = iss_net_set_multicast_list,
 588 };
 589
 590 static int iss_net_configure(int index, char *init)
 591 {
 592         struct net_device *dev;
 593         struct iss_net_private *lp;
 594         int err;
 595
 596         if ((dev = alloc_etherdev(sizeof *lp)) == NULL) {
 597                 printk(KERN_ERR "eth_configure: failed to allocate device\n");
 598                 return 1;
 599         }
 600
 601         /* Initialize private element. */
 602
 603         lp = netdev_priv(dev);
 604         *lp = ((struct iss_net_private) {
 605                 .device_list            = LIST_HEAD_INIT(lp->device_list),
 606                 .opened_list            = LIST_HEAD_INIT(lp->opened_list),
 607                 .lock                   = __SPIN_LOCK_UNLOCKED(lp.lock),
 608                 .dev                    = dev,
 609                 .index                  = index,
 610                 //.fd                   = -1,
 611                 .mac                    = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0 },
 612                 .have_mac               = 0,
 613                 });
 614
 615         /*
 616          * Try all transport protocols.
 617          * Note: more protocols can be added by adding '&& !X_init(lp, eth)'.
 618          */
 619
 620         if (!tuntap_probe(lp, index, init)) {
 621                 printk("Invalid arguments. Skipping device!\n");
 622                 goto errout;
 623         }
 624
 625         printk(KERN_INFO "Netdevice %d ", index);
 626         if (lp->have_mac)
 627                 printk("(%pM) ", lp->mac);
 628         printk(": ");
 629
 630         /* sysfs register */
 631
 632         if (!driver_registered) {
 633                 platform_driver_register(&iss_net_driver);
 634                 driver_registered = 1;
 635         }
 636
 637         spin_lock(&devices_lock);
 638         list_add(&lp->device_list, &devices);
 639         spin_unlock(&devices_lock);
 640
 641         lp->pdev.id = index;
 642         lp->pdev.name = DRIVER_NAME;
 643         platform_device_register(&lp->pdev);
 644         SET_NETDEV_DEV(dev,&lp->pdev.dev);
 645
 646         /*
 647          * If this name ends up conflicting with an existing registered
 648          * netdevice, that is OK, register_netdev{,ice}() will notice this
 649          * and fail.
 650          */
 651         snprintf(dev->name, sizeof dev->name, "eth%d", index);
 652
 653         dev->netdev_ops = &iss_netdev_ops;
 654         dev->mtu = lp->mtu;
 655         dev->watchdog_timeo = (HZ >> 1);
 656         dev->irq = -1;
 657
 658         rtnl_lock();
 659         err = register_netdevice(dev);
 660         rtnl_unlock();
 661
 662         if (err) {
 663                 printk("Error registering net device!\n");
 664                 /* XXX: should we call ->remove() here? */
 665                 free_netdev(dev);
 666                 return 1;
 667         }
 668
 669         init_timer(&lp->tl);
 670         lp->tl.function = iss_net_user_timer_expire;
 671
 672 #if 0
 673         if (lp->have_mac)
 674                 set_ether_mac(dev, lp->mac);
 675 #endif
 676         return 0;
 677
 678 errout:
 679         // FIXME: unregister; free, etc..
 680         return -EIO;
 681
 682 }
 683
 684 /* ------------------------------------------------------------------------- */
 685
 686 /* Filled in during early boot */
 687
 688 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
 689
 690 struct iss_net_init {
 691         struct list_head list;
 692         char *init;             /* init string */
 693         int index;
 694 };
 695
 696 /*
 697  * Parse the command line and look for 'ethX=...' fields, and register all
 698  * those fields. They will be later initialized in iss_net_init.
 699  */
 700
 701 #define ERR KERN_ERR "iss_net_setup: "
 702
 703 static int __init iss_net_setup(char *str)
 704 {
 705         struct iss_net_private *device = NULL;
 706         struct iss_net_init *new;
 707         struct list_head *ele;
 708         char *end;
 709         int n;
 710
 711         n = simple_strtoul(str, &end, 0);
 712         if (end == str) {
 713                 printk(ERR "Failed to parse '%s'\n", str);
 714                 return 1;
 715         }
 716         if (n < 0) {
 717                 printk(ERR "Device %d is negative\n", n);
 718                 return 1;
 719         }
 720         if (*(str = end) != '=') {
 721                 printk(ERR "Expected '=' after device number\n");
 722                 return 1;
 723         }
 724
 725         spin_lock(&devices_lock);
 726
 727         list_for_each(ele, &devices) {
 728                 device = list_entry(ele, struct iss_net_private, device_list);
 729                 if (device->index == n)
 730                         break;
 731         }
 732
 733         spin_unlock(&devices_lock);
 734
 735         if (device && device->index == n) {
 736                 printk(ERR "Device %d already configured\n", n);
 737                 return 1;
 738         }
 739
 740         if ((new = alloc_bootmem(sizeof new)) == NULL) {
 741                 printk("Alloc_bootmem failed\n");
 742                 return 1;
 743         }
 744
 745         INIT_LIST_HEAD(&new->list);
 746         new->index = n;
 747         new->init = str + 1;
 748
 749         list_add_tail(&new->list, &eth_cmd_line);
 750         return 1;
 751 }
 752
 753 #undef ERR
 754
 755 __setup("eth=", iss_net_setup);
 756
 757 /*
 758  * Initialize all ISS Ethernet devices previously registered in iss_net_setup.
 759  */
 760
 761 static int iss_net_init(void)
 762 {
 763         struct list_head *ele, *next;
 764
 765         /* Walk through all Ethernet devices specified in the command line. */
 766
 767         list_for_each_safe(ele, next, &eth_cmd_line) {
 768                 struct iss_net_init *eth;
 769                 eth = list_entry(ele, struct iss_net_init, list);
 770                 iss_net_configure(eth->index, eth->init);
 771         }
 772
 773         return 1;
 774 }
 775
 776 module_init(iss_net_init);
 777