drivers/ieee1394/eth1394.c

   1 /*
   2  * eth1394.c -- IPv4 driver for Linux IEEE-1394 Subsystem
   3  *
   4  * Copyright (C) 2001-2003 Ben Collins <bcollins@debian.org>
   5  *               2000 Bonin Franck <boninf@free.fr>
   6  *               2003 Steve Kinneberg <kinnebergsteve@acmsystems.com>
   7  *
   8  * Mainly based on work by Emanuel Pirker and Andreas E. Bombe
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 /*
  26  * This driver intends to support RFC 2734, which describes a method for
  27  * transporting IPv4 datagrams over IEEE-1394 serial busses.
  28  *
  29  * TODO:
  30  * RFC 2734 related:
  31  * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
  32  *
  33  * Non-RFC 2734 related:
  34  * - Handle fragmented skb's coming from the networking layer.
  35  * - Move generic GASP reception to core 1394 code
  36  * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
  37  * - Stability improvements
  38  * - Performance enhancements
  39  * - Consider garbage collecting old partial datagrams after X amount of time
  40  */
  41
  42 #include <linux/module.h>
  43
  44 #include <linux/kernel.h>
  45 #include <linux/slab.h>
  46 #include <linux/errno.h>
  47 #include <linux/types.h>
  48 #include <linux/delay.h>
  49 #include <linux/init.h>
  50 #include <linux/workqueue.h>
  51
  52 #include <linux/netdevice.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/if_ether.h>
  56 #include <linux/ip.h>
  57 #include <linux/in.h>
  58 #include <linux/tcp.h>
  59 #include <linux/skbuff.h>
  60 #include <linux/bitops.h>
  61 #include <linux/ethtool.h>
  62 #include <asm/uaccess.h>
  63 #include <asm/delay.h>
  64 #include <asm/unaligned.h>
  65 #include <net/arp.h>
  66
  67 #include "config_roms.h"
  68 #include "csr1212.h"
  69 #include "eth1394.h"
  70 #include "highlevel.h"
  71 #include "ieee1394.h"
  72 #include "ieee1394_core.h"
  73 #include "ieee1394_hotplug.h"
  74 #include "ieee1394_transactions.h"
  75 #include "ieee1394_types.h"
  76 #include "iso.h"
  77 #include "nodemgr.h"
  78
  79 #define ETH1394_PRINT_G(level, fmt, args...) \
  80         printk(level "%s: " fmt, driver_name, ## args)
  81
  82 #define ETH1394_PRINT(level, dev_name, fmt, args...) \
  83         printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
  84
  85 struct fragment_info {
  86         struct list_head list;
  87         int offset;
  88         int len;
  89 };
  90
  91 struct partial_datagram {
  92         struct list_head list;
  93         u16 dgl;
  94         u16 dg_size;
  95         __be16 ether_type;
  96         struct sk_buff *skb;
  97         char *pbuf;
  98         struct list_head frag_info;
  99 };
 100
 101 struct pdg_list {
 102         struct list_head list;  /* partial datagram list per node       */
 103         unsigned int sz;        /* partial datagram list size per node  */
 104         spinlock_t lock;        /* partial datagram lock                */
 105 };
 106
 107 struct eth1394_host_info {
 108         struct hpsb_host *host;
 109         struct net_device *dev;
 110 };
 111
 112 struct eth1394_node_ref {
 113         struct unit_directory *ud;
 114         struct list_head list;
 115 };
 116
 117 struct eth1394_node_info {
 118         u16 maxpayload;         /* max payload                  */
 119         u8 sspd;                /* max speed                    */
 120         u64 fifo;               /* FIFO address                 */
 121         struct pdg_list pdg;    /* partial RX datagram lists    */
 122         int dgl;                /* outgoing datagram label      */
 123 };
 124
 125 static const char driver_name[] = "eth1394";
 126
 127 static struct kmem_cache *packet_task_cache;
 128
 129 static struct hpsb_highlevel eth1394_highlevel;
 130
 131 /* Use common.lf to determine header len */
 132 static const int hdr_type_len[] = {
 133         sizeof(struct eth1394_uf_hdr),
 134         sizeof(struct eth1394_ff_hdr),
 135         sizeof(struct eth1394_sf_hdr),
 136         sizeof(struct eth1394_sf_hdr)
 137 };
 138
 139 static const u16 eth1394_speedto_maxpayload[] = {
 140 /*     S100, S200, S400, S800, S1600, S3200 */
 141         512, 1024, 2048, 4096,  4096,  4096
 142 };
 143
 144 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
 145 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
 146 MODULE_LICENSE("GPL");
 147
 148 /*
 149  * The max_partial_datagrams parameter is the maximum number of fragmented
 150  * datagrams per node that eth1394 will keep in memory.  Providing an upper
 151  * bound allows us to limit the amount of memory that partial datagrams
 152  * consume in the event that some partial datagrams are never completed.
 153  */
 154 static int max_partial_datagrams = 25;
 155 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
 156 MODULE_PARM_DESC(max_partial_datagrams,
 157                  "Maximum number of partially received fragmented datagrams "
 158                  "(default = 25).");
 159
 160
 161 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 162                             unsigned short type, const void *daddr,
 163                             const void *saddr, unsigned len);
 164 static int ether1394_rebuild_header(struct sk_buff *skb);
 165 static int ether1394_header_parse(const struct sk_buff *skb,
 166                                   unsigned char *haddr);
 167 static int ether1394_header_cache(const struct neighbour *neigh,
 168                                   struct hh_cache *hh);
 169 static void ether1394_header_cache_update(struct hh_cache *hh,
 170                                           const struct net_device *dev,
 171                                           const unsigned char *haddr);
 172 static netdev_tx_t ether1394_tx(struct sk_buff *skb,
 173                                 struct net_device *dev);
 174 static void ether1394_iso(struct hpsb_iso *iso);
 175
 176 static const struct ethtool_ops ethtool_ops;
 177
 178 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 179                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 180 static void ether1394_add_host(struct hpsb_host *host);
 181 static void ether1394_remove_host(struct hpsb_host *host);
 182 static void ether1394_host_reset(struct hpsb_host *host);
 183
 184 /* Function for incoming 1394 packets */
 185 static const struct hpsb_address_ops addr_ops = {
 186         .write =        ether1394_write,
 187 };
 188
 189 /* Ieee1394 highlevel driver functions */
 190 static struct hpsb_highlevel eth1394_highlevel = {
 191         .name =         driver_name,
 192         .add_host =     ether1394_add_host,
 193         .remove_host =  ether1394_remove_host,
 194         .host_reset =   ether1394_host_reset,
 195 };
 196
 197 static int ether1394_recv_init(struct eth1394_priv *priv)
 198 {
 199         unsigned int iso_buf_size;
 200
 201         /* FIXME: rawiso limits us to PAGE_SIZE */
 202         iso_buf_size = min((unsigned int)PAGE_SIZE,
 203                            2 * (1U << (priv->host->csr.max_rec + 1)));
 204
 205         priv->iso = hpsb_iso_recv_init(priv->host,
 206                                        ETHER1394_GASP_BUFFERS * iso_buf_size,
 207                                        ETHER1394_GASP_BUFFERS,
 208                                        priv->broadcast_channel,
 209                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 210                                        1, ether1394_iso);
 211         if (priv->iso == NULL) {
 212                 ETH1394_PRINT_G(KERN_ERR, "Failed to allocate IR context\n");
 213                 priv->bc_state = ETHER1394_BC_ERROR;
 214                 return -EAGAIN;
 215         }
 216
 217         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 218                 priv->bc_state = ETHER1394_BC_STOPPED;
 219         else
 220                 priv->bc_state = ETHER1394_BC_RUNNING;
 221         return 0;
 222 }
 223
 224 /* This is called after an "ifup" */
 225 static int ether1394_open(struct net_device *dev)
 226 {
 227         struct eth1394_priv *priv = netdev_priv(dev);
 228         int ret;
 229
 230         if (priv->bc_state == ETHER1394_BC_ERROR) {
 231                 ret = ether1394_recv_init(priv);
 232                 if (ret)
 233                         return ret;
 234         }
 235         netif_start_queue(dev);
 236         return 0;
 237 }
 238
 239 /* This is called after an "ifdown" */
 240 static int ether1394_stop(struct net_device *dev)
 241 {
 242         /* flush priv->wake */
 243         flush_scheduled_work();
 244
 245         netif_stop_queue(dev);
 246         return 0;
 247 }
 248
 249 /* FIXME: What to do if we timeout? I think a host reset is probably in order,
 250  * so that's what we do. Should we increment the stat counters too?  */
 251 static void ether1394_tx_timeout(struct net_device *dev)
 252 {
 253         struct hpsb_host *host =
 254                         ((struct eth1394_priv *)netdev_priv(dev))->host;
 255
 256         ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
 257         ether1394_host_reset(host);
 258 }
 259
 260 static inline int ether1394_max_mtu(struct hpsb_host* host)
 261 {
 262         return (1 << (host->csr.max_rec + 1))
 263                         - sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
 264 }
 265
 266 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 267 {
 268         int max_mtu;
 269
 270         if (new_mtu < 68)
 271                 return -EINVAL;
 272
 273         max_mtu = ether1394_max_mtu(
 274                         ((struct eth1394_priv *)netdev_priv(dev))->host);
 275         if (new_mtu > max_mtu) {
 276                 ETH1394_PRINT(KERN_INFO, dev->name,
 277                               "Local node constrains MTU to %d\n", max_mtu);
 278                 return -ERANGE;
 279         }
 280
 281         dev->mtu = new_mtu;
 282         return 0;
 283 }
 284
 285 static void purge_partial_datagram(struct list_head *old)
 286 {
 287         struct partial_datagram *pd;
 288         struct list_head *lh, *n;
 289         struct fragment_info *fi;
 290
 291         pd = list_entry(old, struct partial_datagram, list);
 292
 293         list_for_each_safe(lh, n, &pd->frag_info) {
 294                 fi = list_entry(lh, struct fragment_info, list);
 295                 list_del(lh);
 296                 kfree(fi);
 297         }
 298         list_del(old);
 299         kfree_skb(pd->skb);
 300         kfree(pd);
 301 }
 302
 303 /******************************************
 304  * 1394 bus activity functions
 305  ******************************************/
 306
 307 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 308                                                   struct unit_directory *ud)
 309 {
 310         struct eth1394_node_ref *node;
 311
 312         list_for_each_entry(node, inl, list)
 313                 if (node->ud == ud)
 314                         return node;
 315
 316         return NULL;
 317 }
 318
 319 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 320                                                        u64 guid)
 321 {
 322         struct eth1394_node_ref *node;
 323
 324         list_for_each_entry(node, inl, list)
 325                 if (node->ud->ne->guid == guid)
 326                         return node;
 327
 328         return NULL;
 329 }
 330
 331 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 332                                                          nodeid_t nodeid)
 333 {
 334         struct eth1394_node_ref *node;
 335
 336         list_for_each_entry(node, inl, list)
 337                 if (node->ud->ne->nodeid == nodeid)
 338                         return node;
 339
 340         return NULL;
 341 }
 342
 343 static int eth1394_new_node(struct eth1394_host_info *hi,
 344                             struct unit_directory *ud)
 345 {
 346         struct eth1394_priv *priv;
 347         struct eth1394_node_ref *new_node;
 348         struct eth1394_node_info *node_info;
 349
 350         new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
 351         if (!new_node)
 352                 return -ENOMEM;
 353
 354         node_info = kmalloc(sizeof(*node_info), GFP_KERNEL);
 355         if (!node_info) {
 356                 kfree(new_node);
 357                 return -ENOMEM;
 358         }
 359
 360         spin_lock_init(&node_info->pdg.lock);
 361         INIT_LIST_HEAD(&node_info->pdg.list);
 362         node_info->pdg.sz = 0;
 363         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 364
 365         dev_set_drvdata(&ud->device, node_info);
 366         new_node->ud = ud;
 367
 368         priv = netdev_priv(hi->dev);
 369         list_add_tail(&new_node->list, &priv->ip_node_list);
 370         return 0;
 371 }
 372
 373 static int eth1394_probe(struct device *dev)
 374 {
 375         struct unit_directory *ud;
 376         struct eth1394_host_info *hi;
 377
 378         ud = container_of(dev, struct unit_directory, device);
 379         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 380         if (!hi)
 381                 return -ENOENT;
 382
 383         return eth1394_new_node(hi, ud);
 384 }
 385
 386 static int eth1394_remove(struct device *dev)
 387 {
 388         struct unit_directory *ud;
 389         struct eth1394_host_info *hi;
 390         struct eth1394_priv *priv;
 391         struct eth1394_node_ref *old_node;
 392         struct eth1394_node_info *node_info;
 393         struct list_head *lh, *n;
 394         unsigned long flags;
 395
 396         ud = container_of(dev, struct unit_directory, device);
 397         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 398         if (!hi)
 399                 return -ENOENT;
 400
 401         priv = netdev_priv(hi->dev);
 402
 403         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 404         if (!old_node)
 405                 return 0;
 406
 407         list_del(&old_node->list);
 408         kfree(old_node);
 409
 410         node_info = dev_get_drvdata(&ud->device);
 411
 412         spin_lock_irqsave(&node_info->pdg.lock, flags);
 413         /* The partial datagram list should be empty, but we'll just
 414          * make sure anyway... */
 415         list_for_each_safe(lh, n, &node_info->pdg.list)
 416                 purge_partial_datagram(lh);
 417         spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 418
 419         kfree(node_info);
 420         dev_set_drvdata(&ud->device, NULL);
 421         return 0;
 422 }
 423
 424 static int eth1394_update(struct unit_directory *ud)
 425 {
 426         struct eth1394_host_info *hi;
 427         struct eth1394_priv *priv;
 428         struct eth1394_node_ref *node;
 429
 430         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 431         if (!hi)
 432                 return -ENOENT;
 433
 434         priv = netdev_priv(hi->dev);
 435         node = eth1394_find_node(&priv->ip_node_list, ud);
 436         if (node)
 437                 return 0;
 438
 439         return eth1394_new_node(hi, ud);
 440 }
 441
 442 static const struct ieee1394_device_id eth1394_id_table[] = {
 443         {
 444                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 445                                 IEEE1394_MATCH_VERSION),
 446                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 447                 .version = ETHER1394_GASP_VERSION,
 448         },
 449         {}
 450 };
 451
 452 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 453
 454 static struct hpsb_protocol_driver eth1394_proto_driver = {
 455         .name           = driver_name,
 456         .id_table       = eth1394_id_table,
 457         .update         = eth1394_update,
 458         .driver         = {
 459                 .probe          = eth1394_probe,
 460                 .remove         = eth1394_remove,
 461         },
 462 };
 463
 464 static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
 465 {
 466         unsigned long flags;
 467         int i;
 468         struct eth1394_priv *priv = netdev_priv(dev);
 469         struct hpsb_host *host = priv->host;
 470         u64 guid = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
 471         int max_speed = IEEE1394_SPEED_MAX;
 472
 473         spin_lock_irqsave(&priv->lock, flags);
 474
 475         memset(priv->ud_list, 0, sizeof(priv->ud_list));
 476         priv->bc_maxpayload = 512;
 477
 478         /* Determine speed limit */
 479         /* FIXME: This is broken for nodes with link speed < PHY speed,
 480          * and it is suboptimal for S200B...S800B hardware.
 481          * The result of nodemgr's speed probe should be used somehow. */
 482         for (i = 0; i < host->node_count; i++) {
 483                 /* take care of S100B...S400B PHY ports */
 484                 if (host->speed[i] == SELFID_SPEED_UNKNOWN) {
 485                         max_speed = IEEE1394_SPEED_100;
 486                         break;
 487                 }
 488                 if (max_speed > host->speed[i])
 489                         max_speed = host->speed[i];
 490         }
 491         priv->bc_sspd = max_speed;
 492
 493         if (set_mtu) {
 494                 /* Use the RFC 2734 default 1500 octets or the maximum payload
 495                  * as initial MTU */
 496                 dev->mtu = min(1500, ether1394_max_mtu(host));
 497
 498                 /* Set our hardware address while we're at it */
 499                 memcpy(dev->dev_addr, &guid, sizeof(u64));
 500                 memset(dev->broadcast, 0xff, sizeof(u64));
 501         }
 502
 503         spin_unlock_irqrestore(&priv->lock, flags);
 504 }
 505
 506 static const struct header_ops ether1394_header_ops = {
 507         .create         = ether1394_header,
 508         .rebuild        = ether1394_rebuild_header,
 509         .cache          = ether1394_header_cache,
 510         .cache_update   = ether1394_header_cache_update,
 511         .parse          = ether1394_header_parse,
 512 };
 513
 514 static const struct net_device_ops ether1394_netdev_ops = {
 515         .ndo_open       = ether1394_open,
 516         .ndo_stop       = ether1394_stop,
 517         .ndo_start_xmit = ether1394_tx,
 518         .ndo_tx_timeout = ether1394_tx_timeout,
 519         .ndo_change_mtu = ether1394_change_mtu,
 520 };
 521
 522 static void ether1394_init_dev(struct net_device *dev)
 523 {
 524
 525         dev->header_ops         = &ether1394_header_ops;
 526         dev->netdev_ops         = &ether1394_netdev_ops;
 527
 528         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 529
 530         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 531         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 532         dev->features           = NETIF_F_HIGHDMA;
 533         dev->addr_len           = ETH1394_ALEN;
 534         dev->hard_header_len    = ETH1394_HLEN;
 535         dev->type               = ARPHRD_IEEE1394;
 536
 537         /* FIXME: This value was copied from ether_setup(). Is it too much? */
 538         dev->tx_queue_len       = 1000;
 539 }
 540
 541 /*
 542  * Wake the queue up after commonly encountered transmit failure conditions are
 543  * hopefully over.  Currently only tlabel exhaustion is accounted for.
 544  */
 545 static void ether1394_wake_queue(struct work_struct *work)
 546 {
 547         struct eth1394_priv *priv;
 548         struct hpsb_packet *packet;
 549
 550         priv = container_of(work, struct eth1394_priv, wake);
 551         packet = hpsb_alloc_packet(0);
 552
 553         /* This is really bad, but unjam the queue anyway. */
 554         if (!packet)
 555                 goto out;
 556
 557         packet->host = priv->host;
 558         packet->node_id = priv->wake_node;
 559         /*
 560          * A transaction label is all we really want.  If we get one, it almost
 561          * always means we can get a lot more because the ieee1394 core recycled
 562          * a whole batch of tlabels, at last.
 563          */
 564         if (hpsb_get_tlabel(packet) == 0)
 565                 hpsb_free_tlabel(packet);
 566
 567         hpsb_free_packet(packet);
 568 out:
 569         netif_wake_queue(priv->wake_dev);
 570 }
 571
 572 /*
 573  * This function is called every time a card is found. It is generally called
 574  * when the module is installed. This is where we add all of our ethernet
 575  * devices. One for each host.
 576  */
 577 static void ether1394_add_host(struct hpsb_host *host)
 578 {
 579         struct eth1394_host_info *hi = NULL;
 580         struct net_device *dev = NULL;
 581         struct eth1394_priv *priv;
 582         u64 fifo_addr;
 583
 584         if (hpsb_config_rom_ip1394_add(host) != 0) {
 585                 ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
 586                 return;
 587         }
 588
 589         fifo_addr = hpsb_allocate_and_register_addrspace(
 590                         &eth1394_highlevel, host, &addr_ops,
 591                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 592                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 593         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
 594                 ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
 595                 hpsb_config_rom_ip1394_remove(host);
 596                 return;
 597         }
 598
 599         dev = alloc_netdev(sizeof(*priv), "eth%d", ether1394_init_dev);
 600         if (dev == NULL) {
 601                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 602                 goto out;
 603         }
 604
 605         SET_NETDEV_DEV(dev, &host->device);
 606
 607         priv = netdev_priv(dev);
 608         INIT_LIST_HEAD(&priv->ip_node_list);
 609         spin_lock_init(&priv->lock);
 610         priv->host = host;
 611         priv->local_fifo = fifo_addr;
 612         INIT_WORK(&priv->wake, ether1394_wake_queue);
 613         priv->wake_dev = dev;
 614
 615         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 616         if (hi == NULL) {
 617                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 618                 goto out;
 619         }
 620
 621         ether1394_reset_priv(dev, 1);
 622
 623         if (register_netdev(dev)) {
 624                 ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
 625                 goto out;
 626         }
 627
 628         ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (fw-host%d)\n",
 629                       host->id);
 630
 631         hi->host = host;
 632         hi->dev = dev;
 633
 634         /* Ignore validity in hopes that it will be set in the future.  It'll
 635          * be checked when the eth device is opened. */
 636         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 637
 638         ether1394_recv_init(priv);
 639         return;
 640 out:
 641         if (dev)
 642                 free_netdev(dev);
 643         if (hi)
 644                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 645         hpsb_unregister_addrspace(&eth1394_highlevel, host, fifo_addr);
 646         hpsb_config_rom_ip1394_remove(host);
 647 }
 648
 649 /* Remove a card from our list */
 650 static void ether1394_remove_host(struct hpsb_host *host)
 651 {
 652         struct eth1394_host_info *hi;
 653         struct eth1394_priv *priv;
 654
 655         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 656         if (!hi)
 657                 return;
 658         priv = netdev_priv(hi->dev);
 659         hpsb_unregister_addrspace(&eth1394_highlevel, host, priv->local_fifo);
 660         hpsb_config_rom_ip1394_remove(host);
 661         if (priv->iso)
 662                 hpsb_iso_shutdown(priv->iso);
 663         unregister_netdev(hi->dev);
 664         free_netdev(hi->dev);
 665 }
 666
 667 /* A bus reset happened */
 668 static void ether1394_host_reset(struct hpsb_host *host)
 669 {
 670         struct eth1394_host_info *hi;
 671         struct eth1394_priv *priv;
 672         struct net_device *dev;
 673         struct list_head *lh, *n;
 674         struct eth1394_node_ref *node;
 675         struct eth1394_node_info *node_info;
 676         unsigned long flags;
 677
 678         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 679
 680         /* This can happen for hosts that we don't use */
 681         if (!hi)
 682                 return;
 683
 684         dev = hi->dev;
 685         priv = netdev_priv(dev);
 686
 687         /* Reset our private host data, but not our MTU */
 688         netif_stop_queue(dev);
 689         ether1394_reset_priv(dev, 0);
 690
 691         list_for_each_entry(node, &priv->ip_node_list, list) {
 692                 node_info = dev_get_drvdata(&node->ud->device);
 693
 694                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 695
 696                 list_for_each_safe(lh, n, &node_info->pdg.list)
 697                         purge_partial_datagram(lh);
 698
 699                 INIT_LIST_HEAD(&(node_info->pdg.list));
 700                 node_info->pdg.sz = 0;
 701
 702                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 703         }
 704
 705         netif_wake_queue(dev);
 706 }
 707
 708 /******************************************
 709  * HW Header net device functions
 710  ******************************************/
 711 /* These functions have been adapted from net/ethernet/eth.c */
 712
 713 /* Create a fake MAC header for an arbitrary protocol layer.
 714  * saddr=NULL means use device source address
 715  * daddr=NULL means leave destination address (eg unresolved arp). */
 716 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 717                             unsigned short type, const void *daddr,
 718                             const void *saddr, unsigned len)
 719 {
 720         struct eth1394hdr *eth =
 721                         (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 722
 723         eth->h_proto = htons(type);
 724
 725         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 726                 memset(eth->h_dest, 0, dev->addr_len);
 727                 return dev->hard_header_len;
 728         }
 729
 730         if (daddr) {
 731                 memcpy(eth->h_dest, daddr, dev->addr_len);
 732                 return dev->hard_header_len;
 733         }
 734
 735         return -dev->hard_header_len;
 736 }
 737
 738 /* Rebuild the faked MAC header. This is called after an ARP
 739  * (or in future other address resolution) has completed on this
 740  * sk_buff. We now let ARP fill in the other fields.
 741  *
 742  * This routine CANNOT use cached dst->neigh!
 743  * Really, it is used only when dst->neigh is wrong.
 744  */
 745 static int ether1394_rebuild_header(struct sk_buff *skb)
 746 {
 747         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 748
 749         if (eth->h_proto == htons(ETH_P_IP))
 750                 return arp_find((unsigned char *)&eth->h_dest, skb);
 751
 752         ETH1394_PRINT(KERN_DEBUG, skb->dev->name,
 753                       "unable to resolve type %04x addresses\n",
 754                       ntohs(eth->h_proto));
 755         return 0;
 756 }
 757
 758 static int ether1394_header_parse(const struct sk_buff *skb,
 759                                   unsigned char *haddr)
 760 {
 761         memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
 762         return ETH1394_ALEN;
 763 }
 764
 765 static int ether1394_header_cache(const struct neighbour *neigh,
 766                                   struct hh_cache *hh)
 767 {
 768         __be16 type = hh->hh_type;
 769         struct net_device *dev = neigh->dev;
 770         struct eth1394hdr *eth =
 771                 (struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
 772
 773         if (type == htons(ETH_P_802_3))
 774                 return -1;
 775
 776         eth->h_proto = type;
 777         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 778
 779         hh->hh_len = ETH1394_HLEN;
 780         return 0;
 781 }
 782
 783 /* Called by Address Resolution module to notify changes in address. */
 784 static void ether1394_header_cache_update(struct hh_cache *hh,
 785                                           const struct net_device *dev,
 786                                           const unsigned char * haddr)
 787 {
 788         memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
 789 }
 790
 791 /******************************************
 792  * Datagram reception code
 793  ******************************************/
 794
 795 /* Copied from net/ethernet/eth.c */
 796 static __be16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
 797 {
 798         struct eth1394hdr *eth;
 799         unsigned char *rawp;
 800
 801         skb_reset_mac_header(skb);
 802         skb_pull(skb, ETH1394_HLEN);
 803         eth = eth1394_hdr(skb);
 804
 805         if (*eth->h_dest & 1) {
 806                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len) == 0)
 807                         skb->pkt_type = PACKET_BROADCAST;
 808 #if 0
 809                 else
 810                         skb->pkt_type = PACKET_MULTICAST;
 811 #endif
 812         } else {
 813                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 814                         skb->pkt_type = PACKET_OTHERHOST;
 815         }
 816
 817         if (ntohs(eth->h_proto) >= 1536)
 818                 return eth->h_proto;
 819
 820         rawp = skb->data;
 821
 822         if (*(unsigned short *)rawp == 0xFFFF)
 823                 return htons(ETH_P_802_3);
 824
 825         return htons(ETH_P_802_2);
 826 }
 827
 828 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 829  * We also perform ARP translation here, if need be.  */
 830 static __be16 ether1394_parse_encap(struct sk_buff *skb, struct net_device *dev,
 831                                  nodeid_t srcid, nodeid_t destid,
 832                                  __be16 ether_type)
 833 {
 834         struct eth1394_priv *priv = netdev_priv(dev);
 835         __be64 dest_hw;
 836         __be16 ret = 0;
 837
 838         /* Setup our hw addresses. We use these to build the ethernet header. */
 839         if (destid == (LOCAL_BUS | ALL_NODES))
 840                 dest_hw = ~cpu_to_be64(0);  /* broadcast */
 841         else
 842                 dest_hw = cpu_to_be64((u64)priv->host->csr.guid_hi << 32 |
 843                                       priv->host->csr.guid_lo);
 844
 845         /* If this is an ARP packet, convert it. First, we want to make
 846          * use of some of the fields, since they tell us a little bit
 847          * about the sending machine.  */
 848         if (ether_type == htons(ETH_P_ARP)) {
 849                 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
 850                 struct arphdr *arp = (struct arphdr *)skb->data;
 851                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 852                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 853                                            ntohl(arp1394->fifo_lo);
 854                 u8 max_rec = min(priv->host->csr.max_rec,
 855                                  (u8)(arp1394->max_rec));
 856                 int sspd = arp1394->sspd;
 857                 u16 maxpayload;
 858                 struct eth1394_node_ref *node;
 859                 struct eth1394_node_info *node_info;
 860                 __be64 guid;
 861
 862                 /* Sanity check. MacOSX seems to be sending us 131 in this
 863                  * field (atleast on my Panther G5). Not sure why. */
 864                 if (sspd > 5 || sspd < 0)
 865                         sspd = 0;
 866
 867                 maxpayload = min(eth1394_speedto_maxpayload[sspd],
 868                                  (u16)(1 << (max_rec + 1)));
 869
 870                 guid = get_unaligned(&arp1394->s_uniq_id);
 871                 node = eth1394_find_node_guid(&priv->ip_node_list,
 872                                               be64_to_cpu(guid));
 873                 if (!node)
 874                         return cpu_to_be16(0);
 875
 876                 node_info = dev_get_drvdata(&node->ud->device);
 877
 878                 /* Update our speed/payload/fifo_offset table */
 879                 node_info->maxpayload = maxpayload;
 880                 node_info->sspd =       sspd;
 881                 node_info->fifo =       fifo_addr;
 882
 883                 /* Now that we're done with the 1394 specific stuff, we'll
 884                  * need to alter some of the data.  Believe it or not, all
 885                  * that needs to be done is sender_IP_address needs to be
 886                  * moved, the destination hardware address get stuffed
 887                  * in and the hardware address length set to 8.
 888                  *
 889                  * IMPORTANT: The code below overwrites 1394 specific data
 890                  * needed above so keep the munging of the data for the
 891                  * higher level IP stack last. */
 892
 893                 arp->ar_hln = 8;
 894                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 895                 *(u32 *)arp_ptr = arp1394->sip; /* move sender IP addr */
 896                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 897
 898                 if (arp->ar_op == htons(ARPOP_REQUEST))
 899                         memset(arp_ptr, 0, sizeof(u64));
 900                 else
 901                         memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
 902         }
 903
 904         /* Now add the ethernet header. */
 905         if (dev_hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 906                             skb->len) >= 0)
 907                 ret = ether1394_type_trans(skb, dev);
 908
 909         return ret;
 910 }
 911
 912 static int fragment_overlap(struct list_head *frag_list, int offset, int len)
 913 {
 914         struct fragment_info *fi;
 915         int end = offset + len;
 916
 917         list_for_each_entry(fi, frag_list, list)
 918                 if (offset < fi->offset + fi->len && end > fi->offset)
 919                         return 1;
 920
 921         return 0;
 922 }
 923
 924 static struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 925 {
 926         struct partial_datagram *pd;
 927
 928         list_for_each_entry(pd, pdgl, list)
 929                 if (pd->dgl == dgl)
 930                         return &pd->list;
 931
 932         return NULL;
 933 }
 934
 935 /* Assumes that new fragment does not overlap any existing fragments */
 936 static int new_fragment(struct list_head *frag_info, int offset, int len)
 937 {
 938         struct list_head *lh;
 939         struct fragment_info *fi, *fi2, *new;
 940
 941         list_for_each(lh, frag_info) {
 942                 fi = list_entry(lh, struct fragment_info, list);
 943                 if (fi->offset + fi->len == offset) {
 944                         /* The new fragment can be tacked on to the end */
 945                         fi->len += len;
 946                         /* Did the new fragment plug a hole? */
 947                         fi2 = list_entry(lh->next, struct fragment_info, list);
 948                         if (fi->offset + fi->len == fi2->offset) {
 949                                 /* glue fragments together */
 950                                 fi->len += fi2->len;
 951                                 list_del(lh->next);
 952                                 kfree(fi2);
 953                         }
 954                         return 0;
 955                 } else if (offset + len == fi->offset) {
 956                         /* The new fragment can be tacked on to the beginning */
 957                         fi->offset = offset;
 958                         fi->len += len;
 959                         /* Did the new fragment plug a hole? */
 960                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 961                         if (fi2->offset + fi2->len == fi->offset) {
 962                                 /* glue fragments together */
 963                                 fi2->len += fi->len;
 964                                 list_del(lh);
 965                                 kfree(fi);
 966                         }
 967                         return 0;
 968                 } else if (offset > fi->offset + fi->len) {
 969                         break;
 970                 } else if (offset + len < fi->offset) {
 971                         lh = lh->prev;
 972                         break;
 973                 }
 974         }
 975
 976         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 977         if (!new)
 978                 return -ENOMEM;
 979
 980         new->offset = offset;
 981         new->len = len;
 982
 983         list_add(&new->list, lh);
 984         return 0;
 985 }
 986
 987 static int new_partial_datagram(struct net_device *dev, struct list_head *pdgl,
 988                                 int dgl, int dg_size, char *frag_buf,
 989                                 int frag_off, int frag_len)
 990 {
 991         struct partial_datagram *new;
 992
 993         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 994         if (!new)
 995                 return -ENOMEM;
 996
 997         INIT_LIST_HEAD(&new->frag_info);
 998
 999         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1000                 kfree(new);
1001                 return -ENOMEM;
1002         }
1003
1004         new->dgl = dgl;
1005         new->dg_size = dg_size;
1006
1007         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1008         if (!new->skb) {
1009                 struct fragment_info *fi = list_entry(new->frag_info.next,
1010                                                       struct fragment_info,
1011                                                       list);
1012                 kfree(fi);
1013                 kfree(new);
1014                 return -ENOMEM;
1015         }
1016
1017         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1018         new->pbuf = skb_put(new->skb, dg_size);
1019         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1020
1021         list_add(&new->list, pdgl);
1022         return 0;
1023 }
1024
1025 static int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1026                                    char *frag_buf, int frag_off, int frag_len)
1027 {
1028         struct partial_datagram *pd =
1029                         list_entry(lh, struct partial_datagram, list);
1030
1031         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0)
1032                 return -ENOMEM;
1033
1034         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1035
1036         /* Move list entry to beginnig of list so that oldest partial
1037          * datagrams percolate to the end of the list */
1038         list_move(lh, pdgl);
1039         return 0;
1040 }
1041
1042 static int is_datagram_complete(struct list_head *lh, int dg_size)
1043 {
1044         struct partial_datagram *pd;
1045         struct fragment_info *fi;
1046
1047         pd = list_entry(lh, struct partial_datagram, list);
1048         fi = list_entry(pd->frag_info.next, struct fragment_info, list);
1049
1050         return (fi->len == dg_size);
1051 }
1052
1053 /* Packet reception. We convert the IP1394 encapsulation header to an
1054  * ethernet header, and fill it with some of our other fields. This is
1055  * an incoming packet from the 1394 bus.  */
1056 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1057                                   char *buf, int len)
1058 {
1059         struct sk_buff *skb;
1060         unsigned long flags;
1061         struct eth1394_priv *priv = netdev_priv(dev);
1062         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1063         __be16 ether_type = cpu_to_be16(0);  /* initialized to clear warning */
1064         int hdr_len;
1065         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1066         struct eth1394_node_info *node_info;
1067
1068         if (!ud) {
1069                 struct eth1394_node_ref *node;
1070                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1071                 if (unlikely(!node)) {
1072                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1073                                    "lookup failure: " NODE_BUS_FMT,
1074                                    NODE_BUS_ARGS(priv->host, srcid));
1075                         dev->stats.rx_dropped++;
1076                         return -1;
1077                 }
1078                 ud = node->ud;
1079
1080                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1081         }
1082
1083         node_info = dev_get_drvdata(&ud->device);
1084
1085         /* First, did we receive a fragmented or unfragmented datagram? */
1086         hdr->words.word1 = ntohs(hdr->words.word1);
1087
1088         hdr_len = hdr_type_len[hdr->common.lf];
1089
1090         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1091                 /* An unfragmented datagram has been received by the ieee1394
1092                  * bus. Build an skbuff around it so we can pass it to the
1093                  * high level network layer. */
1094
1095                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1096                 if (unlikely(!skb)) {
1097                         ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
1098                         dev->stats.rx_dropped++;
1099                         return -1;
1100                 }
1101                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1102                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len,
1103                        len - hdr_len);
1104                 ether_type = hdr->uf.ether_type;
1105         } else {
1106                 /* A datagram fragment has been received, now the fun begins. */
1107
1108                 struct list_head *pdgl, *lh;
1109                 struct partial_datagram *pd;
1110                 int fg_off;
1111                 int fg_len = len - hdr_len;
1112                 int dg_size;
1113                 int dgl;
1114                 int retval;
1115                 struct pdg_list *pdg = &(node_info->pdg);
1116
1117                 hdr->words.word3 = ntohs(hdr->words.word3);
1118                 /* The 4th header word is reserved so no need to do ntohs() */
1119
1120                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1121                         ether_type = hdr->ff.ether_type;
1122                         dgl = hdr->ff.dgl;
1123                         dg_size = hdr->ff.dg_size + 1;
1124                         fg_off = 0;
1125                 } else {
1126                         hdr->words.word2 = ntohs(hdr->words.word2);
1127                         dgl = hdr->sf.dgl;
1128                         dg_size = hdr->sf.dg_size + 1;
1129                         fg_off = hdr->sf.fg_off;
1130                 }
1131                 spin_lock_irqsave(&pdg->lock, flags);
1132
1133                 pdgl = &(pdg->list);
1134                 lh = find_partial_datagram(pdgl, dgl);
1135
1136                 if (lh == NULL) {
1137                         while (pdg->sz >= max_partial_datagrams) {
1138                                 /* remove the oldest */
1139                                 purge_partial_datagram(pdgl->prev);
1140                                 pdg->sz--;
1141                         }
1142
1143                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1144                                                       buf + hdr_len, fg_off,
1145                                                       fg_len);
1146                         if (retval < 0) {
1147                                 spin_unlock_irqrestore(&pdg->lock, flags);
1148                                 goto bad_proto;
1149                         }
1150                         pdg->sz++;
1151                         lh = find_partial_datagram(pdgl, dgl);
1152                 } else {
1153                         pd = list_entry(lh, struct partial_datagram, list);
1154
1155                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1156                                 /* Overlapping fragments, obliterate old
1157                                  * datagram and start new one. */
1158                                 purge_partial_datagram(lh);
1159                                 retval = new_partial_datagram(dev, pdgl, dgl,
1160                                                               dg_size,
1161                                                               buf + hdr_len,
1162                                                               fg_off, fg_len);
1163                                 if (retval < 0) {
1164                                         pdg->sz--;
1165                                         spin_unlock_irqrestore(&pdg->lock, flags);
1166                                         goto bad_proto;
1167                                 }
1168                         } else {
1169                                 retval = update_partial_datagram(pdgl, lh,
1170                                                                  buf + hdr_len,
1171                                                                  fg_off, fg_len);
1172                                 if (retval < 0) {
1173                                         /* Couldn't save off fragment anyway
1174                                          * so might as well obliterate the
1175                                          * datagram now. */
1176                                         purge_partial_datagram(lh);
1177                                         pdg->sz--;
1178                                         spin_unlock_irqrestore(&pdg->lock, flags);
1179                                         goto bad_proto;
1180                                 }
1181                         } /* fragment overlap */
1182                 } /* new datagram or add to existing one */
1183
1184                 pd = list_entry(lh, struct partial_datagram, list);
1185
1186                 if (hdr->common.lf == ETH1394_HDR_LF_FF)
1187                         pd->ether_type = ether_type;
1188
1189                 if (is_datagram_complete(lh, dg_size)) {
1190                         ether_type = pd->ether_type;
1191                         pdg->sz--;
1192                         skb = skb_get(pd->skb);
1193                         purge_partial_datagram(lh);
1194                         spin_unlock_irqrestore(&pdg->lock, flags);
1195                 } else {
1196                         /* Datagram is not complete, we're done for the
1197                          * moment. */
1198                         spin_unlock_irqrestore(&pdg->lock, flags);
1199                         return 0;
1200                 }
1201         } /* unframgented datagram or fragmented one */
1202
1203         /* Write metadata, and then pass to the receive level */
1204         skb->dev = dev;
1205         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1206
1207         /* Parse the encapsulation header. This actually does the job of
1208          * converting to an ethernet frame header, aswell as arp
1209          * conversion if needed. ARP conversion is easier in this
1210          * direction, since we are using ethernet as our backend.  */
1211         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1212                                               ether_type);
1213
1214         spin_lock_irqsave(&priv->lock, flags);
1215
1216         if (!skb->protocol) {
1217                 dev->stats.rx_errors++;
1218                 dev->stats.rx_dropped++;
1219                 dev_kfree_skb_any(skb);
1220         } else if (netif_rx(skb) == NET_RX_DROP) {
1221                 dev->stats.rx_errors++;
1222                 dev->stats.rx_dropped++;
1223         } else {
1224                 dev->stats.rx_packets++;
1225                 dev->stats.rx_bytes += skb->len;
1226         }
1227
1228         spin_unlock_irqrestore(&priv->lock, flags);
1229
1230 bad_proto:
1231         if (netif_queue_stopped(dev))
1232                 netif_wake_queue(dev);
1233
1234         return 0;
1235 }
1236
1237 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1238                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1239 {
1240         struct eth1394_host_info *hi;
1241
1242         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1243         if (unlikely(!hi)) {
1244                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1245                                 host->id);
1246                 return RCODE_ADDRESS_ERROR;
1247         }
1248
1249         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1250                 return RCODE_ADDRESS_ERROR;
1251         else
1252                 return RCODE_COMPLETE;
1253 }
1254
1255 static void ether1394_iso(struct hpsb_iso *iso)
1256 {
1257         __be32 *data;
1258         char *buf;
1259         struct eth1394_host_info *hi;
1260         struct net_device *dev;
1261         unsigned int len;
1262         u32 specifier_id;
1263         u16 source_id;
1264         int i;
1265         int nready;
1266
1267         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1268         if (unlikely(!hi)) {
1269                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1270                                 iso->host->id);
1271                 return;
1272         }
1273
1274         dev = hi->dev;
1275
1276         nready = hpsb_iso_n_ready(iso);
1277         for (i = 0; i < nready; i++) {
1278                 struct hpsb_iso_packet_info *info =
1279                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1280                 data = (__be32 *)(iso->data_buf.kvirt + info->offset);
1281
1282                 /* skip over GASP header */
1283                 buf = (char *)data + 8;
1284                 len = info->len - 8;
1285
1286                 specifier_id = (be32_to_cpu(data[0]) & 0xffff) << 8 |
1287                                (be32_to_cpu(data[1]) & 0xff000000) >> 24;
1288                 source_id = be32_to_cpu(data[0]) >> 16;
1289
1290                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f)
1291                     || specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1292                         /* This packet is not for us */
1293                         continue;
1294                 }
1295                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1296                                        buf, len);
1297         }
1298
1299         hpsb_iso_recv_release_packets(iso, i);
1300
1301 }
1302
1303 /******************************************
1304  * Datagram transmission code
1305  ******************************************/
1306
1307 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1308  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1309  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1310  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1311  * judge.
1312  *
1313  * Now that the EUI is used for the hardware address all we need to do to make
1314  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1315  * speed, and unicast FIFO address information between the sender_unique_id
1316  * and the IP addresses.
1317  */
1318 static void ether1394_arp_to_1394arp(struct sk_buff *skb,
1319                                      struct net_device *dev)
1320 {
1321         struct eth1394_priv *priv = netdev_priv(dev);
1322         struct arphdr *arp = (struct arphdr *)skb->data;
1323         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1324         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1325
1326         arp1394->hw_addr_len    = 16;
1327         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1328         arp1394->max_rec        = priv->host->csr.max_rec;
1329         arp1394->sspd           = priv->host->csr.lnk_spd;
1330         arp1394->fifo_hi        = htons(priv->local_fifo >> 32);
1331         arp1394->fifo_lo        = htonl(priv->local_fifo & ~0x0);
1332 }
1333
1334 /* We need to encapsulate the standard header with our own. We use the
1335  * ethernet header's proto for our own. */
1336 static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1337                                                __be16 proto,
1338                                                union eth1394_hdr *hdr,
1339                                                u16 dg_size, u16 dgl)
1340 {
1341         unsigned int adj_max_payload =
1342                                 max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1343
1344         /* Does it all fit in one packet? */
1345         if (dg_size <= adj_max_payload) {
1346                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1347                 hdr->uf.ether_type = proto;
1348         } else {
1349                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1350                 hdr->ff.ether_type = proto;
1351                 hdr->ff.dg_size = dg_size - 1;
1352                 hdr->ff.dgl = dgl;
1353                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1354         }
1355         return DIV_ROUND_UP(dg_size, adj_max_payload);
1356 }
1357
1358 static unsigned int ether1394_encapsulate(struct sk_buff *skb,
1359                                           unsigned int max_payload,
1360                                           union eth1394_hdr *hdr)
1361 {
1362         union eth1394_hdr *bufhdr;
1363         int ftype = hdr->common.lf;
1364         int hdrsz = hdr_type_len[ftype];
1365         unsigned int adj_max_payload = max_payload - hdrsz;
1366
1367         switch (ftype) {
1368         case ETH1394_HDR_LF_UF:
1369                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1370                 bufhdr->words.word1 = htons(hdr->words.word1);
1371                 bufhdr->words.word2 = hdr->words.word2;
1372                 break;
1373
1374         case ETH1394_HDR_LF_FF:
1375                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1376                 bufhdr->words.word1 = htons(hdr->words.word1);
1377                 bufhdr->words.word2 = hdr->words.word2;
1378                 bufhdr->words.word3 = htons(hdr->words.word3);
1379                 bufhdr->words.word4 = 0;
1380
1381                 /* Set frag type here for future interior fragments */
1382                 hdr->common.lf = ETH1394_HDR_LF_IF;
1383                 hdr->sf.fg_off = 0;
1384                 break;
1385
1386         default:
1387                 hdr->sf.fg_off += adj_max_payload;
1388                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1389                 if (max_payload >= skb->len)
1390                         hdr->common.lf = ETH1394_HDR_LF_LF;
1391                 bufhdr->words.word1 = htons(hdr->words.word1);
1392                 bufhdr->words.word2 = htons(hdr->words.word2);
1393                 bufhdr->words.word3 = htons(hdr->words.word3);
1394                 bufhdr->words.word4 = 0;
1395         }
1396         return min(max_payload, skb->len);
1397 }
1398
1399 static struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1400 {
1401         struct hpsb_packet *p;
1402
1403         p = hpsb_alloc_packet(0);
1404         if (p) {
1405                 p->host = host;
1406                 p->generation = get_hpsb_generation(host);
1407                 p->type = hpsb_async;
1408         }
1409         return p;
1410 }
1411
1412 static int ether1394_prep_write_packet(struct hpsb_packet *p,
1413                                        struct hpsb_host *host, nodeid_t node,
1414                                        u64 addr, void *data, int tx_len)
1415 {
1416         p->node_id = node;
1417
1418         if (hpsb_get_tlabel(p))
1419                 return -EAGAIN;
1420
1421         p->tcode = TCODE_WRITEB;
1422         p->header_size = 16;
1423         p->expect_response = 1;
1424         p->header[0] =
1425                 p->node_id << 16 | p->tlabel << 10 | 1 << 8 | TCODE_WRITEB << 4;
1426         p->header[1] = host->node_id << 16 | addr >> 32;
1427         p->header[2] = addr & 0xffffffff;
1428         p->header[3] = tx_len << 16;
1429         p->data_size = (tx_len + 3) & ~3;
1430         p->data = data;
1431
1432         return 0;
1433 }
1434
1435 static void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1436                                        struct eth1394_priv *priv,
1437                                        struct sk_buff *skb, int length)
1438 {
1439         p->header_size = 4;
1440         p->tcode = TCODE_STREAM_DATA;
1441
1442         p->header[0] = length << 16 | 3 << 14 | priv->broadcast_channel << 8 |
1443                        TCODE_STREAM_DATA << 4;
1444         p->data_size = length;
1445         p->data = (quadlet_t *)skb->data - 2;
1446         p->data[0] = cpu_to_be32(priv->host->node_id << 16 |
1447                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1448         p->data[1] = cpu_to_be32(ETHER1394_GASP_SPECIFIER_ID_LO << 24 |
1449                                  ETHER1394_GASP_VERSION);
1450
1451         p->speed_code = priv->bc_sspd;
1452
1453         /* prevent hpsb_send_packet() from overriding our speed code */
1454         p->node_id = LOCAL_BUS | ALL_NODES;
1455 }
1456
1457 static void ether1394_free_packet(struct hpsb_packet *packet)
1458 {
1459         if (packet->tcode != TCODE_STREAM_DATA)
1460                 hpsb_free_tlabel(packet);
1461         hpsb_free_packet(packet);
1462 }
1463
1464 static void ether1394_complete_cb(void *__ptask);
1465
1466 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1467 {
1468         struct eth1394_priv *priv = ptask->priv;
1469         struct hpsb_packet *packet = NULL;
1470
1471         packet = ether1394_alloc_common_packet(priv->host);
1472         if (!packet)
1473                 return -ENOMEM;
1474
1475         if (ptask->tx_type == ETH1394_GASP) {
1476                 int length = tx_len + 2 * sizeof(quadlet_t);
1477
1478                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1479         } else if (ether1394_prep_write_packet(packet, priv->host,
1480                                                ptask->dest_node,
1481                                                ptask->addr, ptask->skb->data,
1482                                                tx_len)) {
1483                 hpsb_free_packet(packet);
1484                 return -EAGAIN;
1485         }
1486
1487         ptask->packet = packet;
1488         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1489                                       ptask);
1490
1491         if (hpsb_send_packet(packet) < 0) {
1492                 ether1394_free_packet(packet);
1493                 return -EIO;
1494         }
1495
1496         return 0;
1497 }
1498
1499 /* Task function to be run when a datagram transmission is completed */
1500 static void ether1394_dg_complete(struct packet_task *ptask, int fail)
1501 {
1502         struct sk_buff *skb = ptask->skb;
1503         struct net_device *dev = skb->dev;
1504         struct eth1394_priv *priv = netdev_priv(dev);
1505         unsigned long flags;
1506
1507         /* Statistics */
1508         spin_lock_irqsave(&priv->lock, flags);
1509         if (fail) {
1510                 dev->stats.tx_dropped++;
1511                 dev->stats.tx_errors++;
1512         } else {
1513                 dev->stats.tx_bytes += skb->len;
1514                 dev->stats.tx_packets++;
1515         }
1516         spin_unlock_irqrestore(&priv->lock, flags);
1517
1518         dev_kfree_skb_any(skb);
1519         kmem_cache_free(packet_task_cache, ptask);
1520 }
1521
1522 /* Callback for when a packet has been sent and the status of that packet is
1523  * known */
1524 static void ether1394_complete_cb(void *__ptask)
1525 {
1526         struct packet_task *ptask = (struct packet_task *)__ptask;
1527         struct hpsb_packet *packet = ptask->packet;
1528         int fail = 0;
1529
1530         if (packet->tcode != TCODE_STREAM_DATA)
1531                 fail = hpsb_packet_success(packet);
1532
1533         ether1394_free_packet(packet);
1534
1535         ptask->outstanding_pkts--;
1536         if (ptask->outstanding_pkts > 0 && !fail) {
1537                 int tx_len, err;
1538
1539                 /* Add the encapsulation header to the fragment */
1540                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1541                                                &ptask->hdr);
1542                 err = ether1394_send_packet(ptask, tx_len);
1543                 if (err) {
1544                         if (err == -EAGAIN)
1545                                 ETH1394_PRINT_G(KERN_ERR, "Out of tlabels\n");
1546
1547                         ether1394_dg_complete(ptask, 1);
1548                 }
1549         } else {
1550                 ether1394_dg_complete(ptask, fail);
1551         }
1552 }
1553
1554 /* Transmit a packet (called by kernel) */
1555 static netdev_tx_t ether1394_tx(struct sk_buff *skb,
1556                                 struct net_device *dev)
1557 {
1558         struct eth1394hdr hdr_buf;
1559         struct eth1394_priv *priv = netdev_priv(dev);
1560         __be16 proto;
1561         unsigned long flags;
1562         nodeid_t dest_node;
1563         eth1394_tx_type tx_type;
1564         unsigned int tx_len;
1565         unsigned int max_payload;
1566         u16 dg_size;
1567         u16 dgl;
1568         struct packet_task *ptask;
1569         struct eth1394_node_ref *node;
1570         struct eth1394_node_info *node_info = NULL;
1571
1572         ptask = kmem_cache_alloc(packet_task_cache, GFP_ATOMIC);
1573         if (ptask == NULL)
1574                 goto fail;
1575
1576         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1577          * it does not set our validity bit. We need to compensate for
1578          * that somewhere else, but not in eth1394. */
1579 #if 0
1580         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000)
1581                 goto fail;
1582 #endif
1583
1584         skb = skb_share_check(skb, GFP_ATOMIC);
1585         if (!skb)
1586                 goto fail;
1587
1588         /* Get rid of the fake eth1394 header, but first make a copy.
1589          * We might need to rebuild the header on tx failure. */
1590         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1591         skb_pull(skb, ETH1394_HLEN);
1592
1593         proto = hdr_buf.h_proto;
1594         dg_size = skb->len;
1595
1596         /* Set the transmission type for the packet.  ARP packets and IP
1597          * broadcast packets are sent via GASP. */
1598         if (memcmp(hdr_buf.h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1599             proto == htons(ETH_P_ARP) ||
1600             (proto == htons(ETH_P_IP) &&
1601              IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1602                 tx_type = ETH1394_GASP;
1603                 dest_node = LOCAL_BUS | ALL_NODES;
1604                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1605                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1606                 dgl = priv->bc_dgl;
1607                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1608                         priv->bc_dgl++;
1609         } else {
1610                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1611
1612                 node = eth1394_find_node_guid(&priv->ip_node_list,
1613                                               be64_to_cpu(guid));
1614                 if (!node)
1615                         goto fail;
1616
1617                 node_info = dev_get_drvdata(&node->ud->device);
1618                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE)
1619                         goto fail;
1620
1621                 dest_node = node->ud->ne->nodeid;
1622                 max_payload = node_info->maxpayload;
1623                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1624
1625                 dgl = node_info->dgl;
1626                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1627                         node_info->dgl++;
1628                 tx_type = ETH1394_WRREQ;
1629         }
1630
1631         /* If this is an ARP packet, convert it */
1632         if (proto == htons(ETH_P_ARP))
1633                 ether1394_arp_to_1394arp(skb, dev);
1634
1635         ptask->hdr.words.word1 = 0;
1636         ptask->hdr.words.word2 = 0;
1637         ptask->hdr.words.word3 = 0;
1638         ptask->hdr.words.word4 = 0;
1639         ptask->skb = skb;
1640         ptask->priv = priv;
1641         ptask->tx_type = tx_type;
1642
1643         if (tx_type != ETH1394_GASP) {
1644                 u64 addr;
1645
1646                 spin_lock_irqsave(&priv->lock, flags);
1647                 addr = node_info->fifo;
1648                 spin_unlock_irqrestore(&priv->lock, flags);
1649
1650                 ptask->addr = addr;
1651                 ptask->dest_node = dest_node;
1652         }
1653
1654         ptask->tx_type = tx_type;
1655         ptask->max_payload = max_payload;
1656         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload,
1657                                         proto, &ptask->hdr, dg_size, dgl);
1658
1659         /* Add the encapsulation header to the fragment */
1660         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1661         dev->trans_start = jiffies;
1662         if (ether1394_send_packet(ptask, tx_len)) {
1663                 if (dest_node == (LOCAL_BUS | ALL_NODES))
1664                         goto fail;
1665
1666                 /* At this point we want to restore the packet.  When we return
1667                  * here with NETDEV_TX_BUSY we will get another entrance in this
1668                  * routine with the same skb and we need it to look the same.
1669                  * So we pull 4 more bytes, then build the header again. */
1670                 skb_pull(skb, 4);
1671                 ether1394_header(skb, dev, ntohs(hdr_buf.h_proto),
1672                                  hdr_buf.h_dest, NULL, 0);
1673
1674                 /* Most failures of ether1394_send_packet are recoverable. */
1675                 netif_stop_queue(dev);
1676                 priv->wake_node = dest_node;
1677                 schedule_work(&priv->wake);
1678                 kmem_cache_free(packet_task_cache, ptask);
1679                 return NETDEV_TX_BUSY;
1680         }
1681
1682         return NETDEV_TX_OK;
1683 fail:
1684         if (ptask)
1685                 kmem_cache_free(packet_task_cache, ptask);
1686
1687         if (skb != NULL)
1688                 dev_kfree_skb(skb);
1689
1690         spin_lock_irqsave(&priv->lock, flags);
1691         dev->stats.tx_dropped++;
1692         dev->stats.tx_errors++;
1693         spin_unlock_irqrestore(&priv->lock, flags);
1694
1695         return NETDEV_TX_OK;
1696 }
1697
1698 static void ether1394_get_drvinfo(struct net_device *dev,
1699                                   struct ethtool_drvinfo *info)
1700 {
1701         strcpy(info->driver, driver_name);
1702         strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */
1703 }
1704
1705 static const struct ethtool_ops ethtool_ops = {
1706         .get_drvinfo = ether1394_get_drvinfo
1707 };
1708
1709 static int __init ether1394_init_module(void)
1710 {
1711         int err;
1712
1713         packet_task_cache = kmem_cache_create("packet_task",
1714                                               sizeof(struct packet_task),
1715                                               0, 0, NULL);
1716         if (!packet_task_cache)
1717                 return -ENOMEM;
1718
1719         hpsb_register_highlevel(&eth1394_highlevel);
1720         err = hpsb_register_protocol(&eth1394_proto_driver);
1721         if (err) {
1722                 hpsb_unregister_highlevel(&eth1394_highlevel);
1723                 kmem_cache_destroy(packet_task_cache);
1724         }
1725         return err;
1726 }
1727
1728 static void __exit ether1394_exit_module(void)
1729 {
1730         hpsb_unregister_protocol(&eth1394_proto_driver);
1731         hpsb_unregister_highlevel(&eth1394_highlevel);
1732         kmem_cache_destroy(packet_task_cache);
1733 }
1734
1735 module_init(ether1394_init_module);
1736 module_exit(ether1394_exit_module);