Pileus Git - ~andy/linux/blob - 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
  51 #include <linux/netdevice.h>
  52 #include <linux/inetdevice.h>
  53 #include <linux/etherdevice.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         u16 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, void *daddr, void *saddr,
 163                             unsigned len);
 164 static int ether1394_rebuild_header(struct sk_buff *skb);
 165 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
 166 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 167 static void ether1394_header_cache_update(struct hh_cache *hh,
 168                                           struct net_device *dev,
 169                                           unsigned char *haddr);
 170 static int ether1394_mac_addr(struct net_device *dev, void *p);
 171
 172 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 173 static void ether1394_iso(struct hpsb_iso *iso);
 174
 175 static struct ethtool_ops ethtool_ops;
 176
 177 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 178                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 179 static void ether1394_add_host(struct hpsb_host *host);
 180 static void ether1394_remove_host(struct hpsb_host *host);
 181 static void ether1394_host_reset(struct hpsb_host *host);
 182
 183 /* Function for incoming 1394 packets */
 184 static struct hpsb_address_ops addr_ops = {
 185         .write =        ether1394_write,
 186 };
 187
 188 /* Ieee1394 highlevel driver functions */
 189 static struct hpsb_highlevel eth1394_highlevel = {
 190         .name =         driver_name,
 191         .add_host =     ether1394_add_host,
 192         .remove_host =  ether1394_remove_host,
 193         .host_reset =   ether1394_host_reset,
 194 };
 195
 196 static int ether1394_recv_init(struct eth1394_priv *priv)
 197 {
 198         unsigned int iso_buf_size;
 199
 200         /* FIXME: rawiso limits us to PAGE_SIZE */
 201         iso_buf_size = min((unsigned int)PAGE_SIZE,
 202                            2 * (1U << (priv->host->csr.max_rec + 1)));
 203
 204         priv->iso = hpsb_iso_recv_init(priv->host,
 205                                        ETHER1394_GASP_BUFFERS * iso_buf_size,
 206                                        ETHER1394_GASP_BUFFERS,
 207                                        priv->broadcast_channel,
 208                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 209                                        1, ether1394_iso);
 210         if (priv->iso == NULL) {
 211                 ETH1394_PRINT_G(KERN_ERR, "Failed to allocate IR context\n");
 212                 priv->bc_state = ETHER1394_BC_ERROR;
 213                 return -EAGAIN;
 214         }
 215
 216         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 217                 priv->bc_state = ETHER1394_BC_STOPPED;
 218         else
 219                 priv->bc_state = ETHER1394_BC_RUNNING;
 220         return 0;
 221 }
 222
 223 /* This is called after an "ifup" */
 224 static int ether1394_open(struct net_device *dev)
 225 {
 226         struct eth1394_priv *priv = netdev_priv(dev);
 227         int ret;
 228
 229         if (priv->bc_state == ETHER1394_BC_ERROR) {
 230                 ret = ether1394_recv_init(priv);
 231                 if (ret)
 232                         return ret;
 233         }
 234         netif_start_queue(dev);
 235         return 0;
 236 }
 237
 238 /* This is called after an "ifdown" */
 239 static int ether1394_stop(struct net_device *dev)
 240 {
 241         netif_stop_queue(dev);
 242         return 0;
 243 }
 244
 245 /* Return statistics to the caller */
 246 static struct net_device_stats *ether1394_stats(struct net_device *dev)
 247 {
 248         return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
 249 }
 250
 251 /* FIXME: What to do if we timeout? I think a host reset is probably in order,
 252  * so that's what we do. Should we increment the stat counters too?  */
 253 static void ether1394_tx_timeout(struct net_device *dev)
 254 {
 255         struct hpsb_host *host =
 256                         ((struct eth1394_priv *)netdev_priv(dev))->host;
 257
 258         ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
 259         ether1394_host_reset(host);
 260 }
 261
 262 static inline int ether1394_max_mtu(struct hpsb_host* host)
 263 {
 264         return (1 << (host->csr.max_rec + 1))
 265                         - sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
 266 }
 267
 268 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 269 {
 270         int max_mtu;
 271
 272         if (new_mtu < 68)
 273                 return -EINVAL;
 274
 275         max_mtu = ether1394_max_mtu(
 276                         ((struct eth1394_priv *)netdev_priv(dev))->host);
 277         if (new_mtu > max_mtu) {
 278                 ETH1394_PRINT(KERN_INFO, dev->name,
 279                               "Local node constrains MTU to %d\n", max_mtu);
 280                 return -ERANGE;
 281         }
 282
 283         dev->mtu = new_mtu;
 284         return 0;
 285 }
 286
 287 static void purge_partial_datagram(struct list_head *old)
 288 {
 289         struct partial_datagram *pd;
 290         struct list_head *lh, *n;
 291         struct fragment_info *fi;
 292
 293         pd = list_entry(old, struct partial_datagram, list);
 294
 295         list_for_each_safe(lh, n, &pd->frag_info) {
 296                 fi = list_entry(lh, struct fragment_info, list);
 297                 list_del(lh);
 298                 kfree(fi);
 299         }
 300         list_del(old);
 301         kfree_skb(pd->skb);
 302         kfree(pd);
 303 }
 304
 305 /******************************************
 306  * 1394 bus activity functions
 307  ******************************************/
 308
 309 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 310                                                   struct unit_directory *ud)
 311 {
 312         struct eth1394_node_ref *node;
 313
 314         list_for_each_entry(node, inl, list)
 315                 if (node->ud == ud)
 316                         return node;
 317
 318         return NULL;
 319 }
 320
 321 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 322                                                        u64 guid)
 323 {
 324         struct eth1394_node_ref *node;
 325
 326         list_for_each_entry(node, inl, list)
 327                 if (node->ud->ne->guid == guid)
 328                         return node;
 329
 330         return NULL;
 331 }
 332
 333 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 334                                                          nodeid_t nodeid)
 335 {
 336         struct eth1394_node_ref *node;
 337
 338         list_for_each_entry(node, inl, list)
 339                 if (node->ud->ne->nodeid == nodeid)
 340                         return node;
 341
 342         return NULL;
 343 }
 344
 345 static int eth1394_new_node(struct eth1394_host_info *hi,
 346                             struct unit_directory *ud)
 347 {
 348         struct eth1394_priv *priv;
 349         struct eth1394_node_ref *new_node;
 350         struct eth1394_node_info *node_info;
 351
 352         new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
 353         if (!new_node)
 354                 return -ENOMEM;
 355
 356         node_info = kmalloc(sizeof(*node_info), GFP_KERNEL);
 357         if (!node_info) {
 358                 kfree(new_node);
 359                 return -ENOMEM;
 360         }
 361
 362         spin_lock_init(&node_info->pdg.lock);
 363         INIT_LIST_HEAD(&node_info->pdg.list);
 364         node_info->pdg.sz = 0;
 365         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 366
 367         ud->device.driver_data = node_info;
 368         new_node->ud = ud;
 369
 370         priv = netdev_priv(hi->dev);
 371         list_add_tail(&new_node->list, &priv->ip_node_list);
 372         return 0;
 373 }
 374
 375 static int eth1394_probe(struct device *dev)
 376 {
 377         struct unit_directory *ud;
 378         struct eth1394_host_info *hi;
 379
 380         ud = container_of(dev, struct unit_directory, device);
 381         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 382         if (!hi)
 383                 return -ENOENT;
 384
 385         return eth1394_new_node(hi, ud);
 386 }
 387
 388 static int eth1394_remove(struct device *dev)
 389 {
 390         struct unit_directory *ud;
 391         struct eth1394_host_info *hi;
 392         struct eth1394_priv *priv;
 393         struct eth1394_node_ref *old_node;
 394         struct eth1394_node_info *node_info;
 395         struct list_head *lh, *n;
 396         unsigned long flags;
 397
 398         ud = container_of(dev, struct unit_directory, device);
 399         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 400         if (!hi)
 401                 return -ENOENT;
 402
 403         priv = netdev_priv(hi->dev);
 404
 405         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 406         if (!old_node)
 407                 return 0;
 408
 409         list_del(&old_node->list);
 410         kfree(old_node);
 411
 412         node_info = (struct eth1394_node_info*)ud->device.driver_data;
 413
 414         spin_lock_irqsave(&node_info->pdg.lock, flags);
 415         /* The partial datagram list should be empty, but we'll just
 416          * make sure anyway... */
 417         list_for_each_safe(lh, n, &node_info->pdg.list)
 418                 purge_partial_datagram(lh);
 419         spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 420
 421         kfree(node_info);
 422         ud->device.driver_data = NULL;
 423         return 0;
 424 }
 425
 426 static int eth1394_update(struct unit_directory *ud)
 427 {
 428         struct eth1394_host_info *hi;
 429         struct eth1394_priv *priv;
 430         struct eth1394_node_ref *node;
 431
 432         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 433         if (!hi)
 434                 return -ENOENT;
 435
 436         priv = netdev_priv(hi->dev);
 437         node = eth1394_find_node(&priv->ip_node_list, ud);
 438         if (node)
 439                 return 0;
 440
 441         return eth1394_new_node(hi, ud);
 442 }
 443
 444 static struct ieee1394_device_id eth1394_id_table[] = {
 445         {
 446                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 447                                 IEEE1394_MATCH_VERSION),
 448                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 449                 .version = ETHER1394_GASP_VERSION,
 450         },
 451         {}
 452 };
 453
 454 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 455
 456 static struct hpsb_protocol_driver eth1394_proto_driver = {
 457         .name           = driver_name,
 458         .id_table       = eth1394_id_table,
 459         .update         = eth1394_update,
 460         .driver         = {
 461                 .probe          = eth1394_probe,
 462                 .remove         = eth1394_remove,
 463         },
 464 };
 465
 466 static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
 467 {
 468         unsigned long flags;
 469         int i;
 470         struct eth1394_priv *priv = netdev_priv(dev);
 471         struct hpsb_host *host = priv->host;
 472         u64 guid = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
 473         int max_speed = IEEE1394_SPEED_MAX;
 474
 475         spin_lock_irqsave(&priv->lock, flags);
 476
 477         memset(priv->ud_list, 0, sizeof(priv->ud_list));
 478         priv->bc_maxpayload = 512;
 479
 480         /* Determine speed limit */
 481         for (i = 0; i < host->node_count; i++)
 482                 if (max_speed > host->speed[i])
 483                         max_speed = host->speed[i];
 484         priv->bc_sspd = max_speed;
 485
 486         if (set_mtu) {
 487                 /* Use the RFC 2734 default 1500 octets or the maximum payload
 488                  * as initial MTU */
 489                 dev->mtu = min(1500, ether1394_max_mtu(host));
 490
 491                 /* Set our hardware address while we're at it */
 492                 memcpy(dev->dev_addr, &guid, sizeof(u64));
 493                 memset(dev->broadcast, 0xff, sizeof(u64));
 494         }
 495
 496         spin_unlock_irqrestore(&priv->lock, flags);
 497 }
 498
 499 /* This function is called right before register_netdev */
 500 static void ether1394_init_dev(struct net_device *dev)
 501 {
 502         /* Our functions */
 503         dev->open               = ether1394_open;
 504         dev->stop               = ether1394_stop;
 505         dev->hard_start_xmit    = ether1394_tx;
 506         dev->get_stats          = ether1394_stats;
 507         dev->tx_timeout         = ether1394_tx_timeout;
 508         dev->change_mtu         = ether1394_change_mtu;
 509
 510         dev->hard_header        = ether1394_header;
 511         dev->rebuild_header     = ether1394_rebuild_header;
 512         dev->hard_header_cache  = ether1394_header_cache;
 513         dev->header_cache_update= ether1394_header_cache_update;
 514         dev->hard_header_parse  = ether1394_header_parse;
 515         dev->set_mac_address    = ether1394_mac_addr;
 516         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 517
 518         /* Some constants */
 519         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 520         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 521         dev->features           = NETIF_F_HIGHDMA;
 522         dev->addr_len           = ETH1394_ALEN;
 523         dev->hard_header_len    = ETH1394_HLEN;
 524         dev->type               = ARPHRD_IEEE1394;
 525
 526         ether1394_reset_priv(dev, 1);
 527 }
 528
 529 /*
 530  * This function is called every time a card is found. It is generally called
 531  * when the module is installed. This is where we add all of our ethernet
 532  * devices. One for each host.
 533  */
 534 static void ether1394_add_host(struct hpsb_host *host)
 535 {
 536         struct eth1394_host_info *hi = NULL;
 537         struct net_device *dev = NULL;
 538         struct eth1394_priv *priv;
 539         u64 fifo_addr;
 540
 541         if (hpsb_config_rom_ip1394_add(host) != 0) {
 542                 ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
 543                 return;
 544         }
 545
 546         fifo_addr = hpsb_allocate_and_register_addrspace(
 547                         &eth1394_highlevel, host, &addr_ops,
 548                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 549                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 550         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
 551                 ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
 552                 hpsb_config_rom_ip1394_remove(host);
 553                 return;
 554         }
 555
 556         /* We should really have our own alloc_hpsbdev() function in
 557          * net_init.c instead of calling the one for ethernet then hijacking
 558          * it for ourselves.  That way we'd be a real networking device. */
 559         dev = alloc_etherdev(sizeof (struct eth1394_priv));
 560
 561         if (dev == NULL) {
 562                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 563                 goto out;
 564         }
 565
 566         SET_MODULE_OWNER(dev);
 567 #if 0
 568         /* FIXME - Is this the correct parent device anyway? */
 569         SET_NETDEV_DEV(dev, &host->device);
 570 #endif
 571
 572         priv = netdev_priv(dev);
 573
 574         INIT_LIST_HEAD(&priv->ip_node_list);
 575
 576         spin_lock_init(&priv->lock);
 577         priv->host = host;
 578         priv->local_fifo = fifo_addr;
 579
 580         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 581
 582         if (hi == NULL) {
 583                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 584                 goto out;
 585         }
 586
 587         ether1394_init_dev(dev);
 588
 589         if (register_netdev(dev)) {
 590                 ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
 591                 goto out;
 592         }
 593
 594         ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (fw-host%d)\n",
 595                       host->id);
 596
 597         hi->host = host;
 598         hi->dev = dev;
 599
 600         /* Ignore validity in hopes that it will be set in the future.  It'll
 601          * be checked when the eth device is opened. */
 602         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 603
 604         ether1394_recv_init(priv);
 605         return;
 606 out:
 607         if (dev)
 608                 free_netdev(dev);
 609         if (hi)
 610                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 611         hpsb_unregister_addrspace(&eth1394_highlevel, host, fifo_addr);
 612         hpsb_config_rom_ip1394_remove(host);
 613 }
 614
 615 /* Remove a card from our list */
 616 static void ether1394_remove_host(struct hpsb_host *host)
 617 {
 618         struct eth1394_host_info *hi;
 619         struct eth1394_priv *priv;
 620
 621         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 622         if (!hi)
 623                 return;
 624         priv = netdev_priv(hi->dev);
 625         hpsb_unregister_addrspace(&eth1394_highlevel, host, priv->local_fifo);
 626         hpsb_config_rom_ip1394_remove(host);
 627         if (priv->iso)
 628                 hpsb_iso_shutdown(priv->iso);
 629         unregister_netdev(hi->dev);
 630         free_netdev(hi->dev);
 631 }
 632
 633 /* A bus reset happened */
 634 static void ether1394_host_reset(struct hpsb_host *host)
 635 {
 636         struct eth1394_host_info *hi;
 637         struct eth1394_priv *priv;
 638         struct net_device *dev;
 639         struct list_head *lh, *n;
 640         struct eth1394_node_ref *node;
 641         struct eth1394_node_info *node_info;
 642         unsigned long flags;
 643
 644         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 645
 646         /* This can happen for hosts that we don't use */
 647         if (!hi)
 648                 return;
 649
 650         dev = hi->dev;
 651         priv = netdev_priv(dev);
 652
 653         /* Reset our private host data, but not our MTU */
 654         netif_stop_queue(dev);
 655         ether1394_reset_priv(dev, 0);
 656
 657         list_for_each_entry(node, &priv->ip_node_list, list) {
 658                 node_info = node->ud->device.driver_data;
 659
 660                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 661
 662                 list_for_each_safe(lh, n, &node_info->pdg.list)
 663                         purge_partial_datagram(lh);
 664
 665                 INIT_LIST_HEAD(&(node_info->pdg.list));
 666                 node_info->pdg.sz = 0;
 667
 668                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 669         }
 670
 671         netif_wake_queue(dev);
 672 }
 673
 674 /******************************************
 675  * HW Header net device functions
 676  ******************************************/
 677 /* These functions have been adapted from net/ethernet/eth.c */
 678
 679 /* Create a fake MAC header for an arbitrary protocol layer.
 680  * saddr=NULL means use device source address
 681  * daddr=NULL means leave destination address (eg unresolved arp). */
 682 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 683                             unsigned short type, void *daddr, void *saddr,
 684                             unsigned len)
 685 {
 686         struct eth1394hdr *eth =
 687                         (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 688
 689         eth->h_proto = htons(type);
 690
 691         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 692                 memset(eth->h_dest, 0, dev->addr_len);
 693                 return dev->hard_header_len;
 694         }
 695
 696         if (daddr) {
 697                 memcpy(eth->h_dest, daddr, dev->addr_len);
 698                 return dev->hard_header_len;
 699         }
 700
 701         return -dev->hard_header_len;
 702 }
 703
 704 /* Rebuild the faked MAC header. This is called after an ARP
 705  * (or in future other address resolution) has completed on this
 706  * sk_buff. We now let ARP fill in the other fields.
 707  *
 708  * This routine CANNOT use cached dst->neigh!
 709  * Really, it is used only when dst->neigh is wrong.
 710  */
 711 static int ether1394_rebuild_header(struct sk_buff *skb)
 712 {
 713         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 714         struct net_device *dev = skb->dev;
 715
 716         switch (eth->h_proto) {
 717
 718 #ifdef CONFIG_INET
 719         case __constant_htons(ETH_P_IP):
 720                 return arp_find((unsigned char *)&eth->h_dest, skb);
 721 #endif
 722         default:
 723                 ETH1394_PRINT(KERN_DEBUG, dev->name,
 724                               "unable to resolve type %04x addresses.\n",
 725                               ntohs(eth->h_proto));
 726                 break;
 727         }
 728
 729         return 0;
 730 }
 731
 732 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
 733 {
 734         struct net_device *dev = skb->dev;
 735
 736         memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
 737         return ETH1394_ALEN;
 738 }
 739
 740 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 741 {
 742         unsigned short type = hh->hh_type;
 743         struct net_device *dev = neigh->dev;
 744         struct eth1394hdr *eth =
 745                 (struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
 746
 747         if (type == htons(ETH_P_802_3))
 748                 return -1;
 749
 750         eth->h_proto = type;
 751         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 752
 753         hh->hh_len = ETH1394_HLEN;
 754         return 0;
 755 }
 756
 757 /* Called by Address Resolution module to notify changes in address. */
 758 static void ether1394_header_cache_update(struct hh_cache *hh,
 759                                           struct net_device *dev,
 760                                           unsigned char * haddr)
 761 {
 762         memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
 763 }
 764
 765 static int ether1394_mac_addr(struct net_device *dev, void *p)
 766 {
 767         if (netif_running(dev))
 768                 return -EBUSY;
 769
 770         /* Not going to allow setting the MAC address, we really need to use
 771          * the real one supplied by the hardware */
 772          return -EINVAL;
 773 }
 774
 775 /******************************************
 776  * Datagram reception code
 777  ******************************************/
 778
 779 /* Copied from net/ethernet/eth.c */
 780 static u16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
 781 {
 782         struct eth1394hdr *eth;
 783         unsigned char *rawp;
 784
 785         skb_reset_mac_header(skb);
 786         skb_pull(skb, ETH1394_HLEN);
 787         eth = eth1394_hdr(skb);
 788
 789         if (*eth->h_dest & 1) {
 790                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len) == 0)
 791                         skb->pkt_type = PACKET_BROADCAST;
 792 #if 0
 793                 else
 794                         skb->pkt_type = PACKET_MULTICAST;
 795 #endif
 796         } else {
 797                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 798                         skb->pkt_type = PACKET_OTHERHOST;
 799         }
 800
 801         if (ntohs(eth->h_proto) >= 1536)
 802                 return eth->h_proto;
 803
 804         rawp = skb->data;
 805
 806         if (*(unsigned short *)rawp == 0xFFFF)
 807                 return htons(ETH_P_802_3);
 808
 809         return htons(ETH_P_802_2);
 810 }
 811
 812 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 813  * We also perform ARP translation here, if need be.  */
 814 static u16 ether1394_parse_encap(struct sk_buff *skb, struct net_device *dev,
 815                                  nodeid_t srcid, nodeid_t destid,
 816                                  u16 ether_type)
 817 {
 818         struct eth1394_priv *priv = netdev_priv(dev);
 819         u64 dest_hw;
 820         unsigned short ret = 0;
 821
 822         /* Setup our hw addresses. We use these to build the ethernet header. */
 823         if (destid == (LOCAL_BUS | ALL_NODES))
 824                 dest_hw = ~0ULL;  /* broadcast */
 825         else
 826                 dest_hw = cpu_to_be64((u64)priv->host->csr.guid_hi << 32 |
 827                                       priv->host->csr.guid_lo);
 828
 829         /* If this is an ARP packet, convert it. First, we want to make
 830          * use of some of the fields, since they tell us a little bit
 831          * about the sending machine.  */
 832         if (ether_type == htons(ETH_P_ARP)) {
 833                 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
 834                 struct arphdr *arp = (struct arphdr *)skb->data;
 835                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 836                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 837                                            ntohl(arp1394->fifo_lo);
 838                 u8 max_rec = min(priv->host->csr.max_rec,
 839                                  (u8)(arp1394->max_rec));
 840                 int sspd = arp1394->sspd;
 841                 u16 maxpayload;
 842                 struct eth1394_node_ref *node;
 843                 struct eth1394_node_info *node_info;
 844                 __be64 guid;
 845
 846                 /* Sanity check. MacOSX seems to be sending us 131 in this
 847                  * field (atleast on my Panther G5). Not sure why. */
 848                 if (sspd > 5 || sspd < 0)
 849                         sspd = 0;
 850
 851                 maxpayload = min(eth1394_speedto_maxpayload[sspd],
 852                                  (u16)(1 << (max_rec + 1)));
 853
 854                 guid = get_unaligned(&arp1394->s_uniq_id);
 855                 node = eth1394_find_node_guid(&priv->ip_node_list,
 856                                               be64_to_cpu(guid));
 857                 if (!node)
 858                         return 0;
 859
 860                 node_info =
 861                     (struct eth1394_node_info *)node->ud->device.driver_data;
 862
 863                 /* Update our speed/payload/fifo_offset table */
 864                 node_info->maxpayload = maxpayload;
 865                 node_info->sspd =       sspd;
 866                 node_info->fifo =       fifo_addr;
 867
 868                 /* Now that we're done with the 1394 specific stuff, we'll
 869                  * need to alter some of the data.  Believe it or not, all
 870                  * that needs to be done is sender_IP_address needs to be
 871                  * moved, the destination hardware address get stuffed
 872                  * in and the hardware address length set to 8.
 873                  *
 874                  * IMPORTANT: The code below overwrites 1394 specific data
 875                  * needed above so keep the munging of the data for the
 876                  * higher level IP stack last. */
 877
 878                 arp->ar_hln = 8;
 879                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 880                 *(u32 *)arp_ptr = arp1394->sip; /* move sender IP addr */
 881                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 882
 883                 if (arp->ar_op == htons(ARPOP_REQUEST))
 884                         memset(arp_ptr, 0, sizeof(u64));
 885                 else
 886                         memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
 887         }
 888
 889         /* Now add the ethernet header. */
 890         if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 891                              skb->len) >= 0)
 892                 ret = ether1394_type_trans(skb, dev);
 893
 894         return ret;
 895 }
 896
 897 static int fragment_overlap(struct list_head *frag_list, int offset, int len)
 898 {
 899         struct fragment_info *fi;
 900
 901         list_for_each_entry(fi, frag_list, list) {
 902                 if ( ! ((offset > (fi->offset + fi->len - 1)) ||
 903                        ((offset + len - 1) < fi->offset)))
 904                         return 1;
 905         }
 906         return 0;
 907 }
 908
 909 static struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 910 {
 911         struct partial_datagram *pd;
 912
 913         list_for_each_entry(pd, pdgl, list)
 914                 if (pd->dgl == dgl)
 915                         return &pd->list;
 916
 917         return NULL;
 918 }
 919
 920 /* Assumes that new fragment does not overlap any existing fragments */
 921 static int new_fragment(struct list_head *frag_info, int offset, int len)
 922 {
 923         struct list_head *lh;
 924         struct fragment_info *fi, *fi2, *new;
 925
 926         list_for_each(lh, frag_info) {
 927                 fi = list_entry(lh, struct fragment_info, list);
 928                 if (fi->offset + fi->len == offset) {
 929                         /* The new fragment can be tacked on to the end */
 930                         fi->len += len;
 931                         /* Did the new fragment plug a hole? */
 932                         fi2 = list_entry(lh->next, struct fragment_info, list);
 933                         if (fi->offset + fi->len == fi2->offset) {
 934                                 /* glue fragments together */
 935                                 fi->len += fi2->len;
 936                                 list_del(lh->next);
 937                                 kfree(fi2);
 938                         }
 939                         return 0;
 940                 } else if (offset + len == fi->offset) {
 941                         /* The new fragment can be tacked on to the beginning */
 942                         fi->offset = offset;
 943                         fi->len += len;
 944                         /* Did the new fragment plug a hole? */
 945                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 946                         if (fi2->offset + fi2->len == fi->offset) {
 947                                 /* glue fragments together */
 948                                 fi2->len += fi->len;
 949                                 list_del(lh);
 950                                 kfree(fi);
 951                         }
 952                         return 0;
 953                 } else if (offset > fi->offset + fi->len) {
 954                         break;
 955                 } else if (offset + len < fi->offset) {
 956                         lh = lh->prev;
 957                         break;
 958                 }
 959         }
 960
 961         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 962         if (!new)
 963                 return -ENOMEM;
 964
 965         new->offset = offset;
 966         new->len = len;
 967
 968         list_add(&new->list, lh);
 969         return 0;
 970 }
 971
 972 static int new_partial_datagram(struct net_device *dev, struct list_head *pdgl,
 973                                 int dgl, int dg_size, char *frag_buf,
 974                                 int frag_off, int frag_len)
 975 {
 976         struct partial_datagram *new;
 977
 978         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 979         if (!new)
 980                 return -ENOMEM;
 981
 982         INIT_LIST_HEAD(&new->frag_info);
 983
 984         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
 985                 kfree(new);
 986                 return -ENOMEM;
 987         }
 988
 989         new->dgl = dgl;
 990         new->dg_size = dg_size;
 991
 992         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
 993         if (!new->skb) {
 994                 struct fragment_info *fi = list_entry(new->frag_info.next,
 995                                                       struct fragment_info,
 996                                                       list);
 997                 kfree(fi);
 998                 kfree(new);
 999                 return -ENOMEM;
1000         }
1001
1002         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1003         new->pbuf = skb_put(new->skb, dg_size);
1004         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1005
1006         list_add(&new->list, pdgl);
1007         return 0;
1008 }
1009
1010 static int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1011                                    char *frag_buf, int frag_off, int frag_len)
1012 {
1013         struct partial_datagram *pd =
1014                         list_entry(lh, struct partial_datagram, list);
1015
1016         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0)
1017                 return -ENOMEM;
1018
1019         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1020
1021         /* Move list entry to beginnig of list so that oldest partial
1022          * datagrams percolate to the end of the list */
1023         list_move(lh, pdgl);
1024         return 0;
1025 }
1026
1027 static int is_datagram_complete(struct list_head *lh, int dg_size)
1028 {
1029         struct partial_datagram *pd;
1030         struct fragment_info *fi;
1031
1032         pd = list_entry(lh, struct partial_datagram, list);
1033         fi = list_entry(pd->frag_info.next, struct fragment_info, list);
1034
1035         return (fi->len == dg_size);
1036 }
1037
1038 /* Packet reception. We convert the IP1394 encapsulation header to an
1039  * ethernet header, and fill it with some of our other fields. This is
1040  * an incoming packet from the 1394 bus.  */
1041 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1042                                   char *buf, int len)
1043 {
1044         struct sk_buff *skb;
1045         unsigned long flags;
1046         struct eth1394_priv *priv = netdev_priv(dev);
1047         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1048         u16 ether_type = 0;  /* initialized to clear warning */
1049         int hdr_len;
1050         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1051         struct eth1394_node_info *node_info;
1052
1053         if (!ud) {
1054                 struct eth1394_node_ref *node;
1055                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1056                 if (!node) {
1057                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1058                                    "lookup failure: " NODE_BUS_FMT,
1059                                    NODE_BUS_ARGS(priv->host, srcid));
1060                         priv->stats.rx_dropped++;
1061                         return -1;
1062                 }
1063                 ud = node->ud;
1064
1065                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1066         }
1067
1068         node_info = (struct eth1394_node_info *)ud->device.driver_data;
1069
1070         /* First, did we receive a fragmented or unfragmented datagram? */
1071         hdr->words.word1 = ntohs(hdr->words.word1);
1072
1073         hdr_len = hdr_type_len[hdr->common.lf];
1074
1075         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1076                 /* An unfragmented datagram has been received by the ieee1394
1077                  * bus. Build an skbuff around it so we can pass it to the
1078                  * high level network layer. */
1079
1080                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1081                 if (!skb) {
1082                         ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
1083                         priv->stats.rx_dropped++;
1084                         return -1;
1085                 }
1086                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1087                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len,
1088                        len - hdr_len);
1089                 ether_type = hdr->uf.ether_type;
1090         } else {
1091                 /* A datagram fragment has been received, now the fun begins. */
1092
1093                 struct list_head *pdgl, *lh;
1094                 struct partial_datagram *pd;
1095                 int fg_off;
1096                 int fg_len = len - hdr_len;
1097                 int dg_size;
1098                 int dgl;
1099                 int retval;
1100                 struct pdg_list *pdg = &(node_info->pdg);
1101
1102                 hdr->words.word3 = ntohs(hdr->words.word3);
1103                 /* The 4th header word is reserved so no need to do ntohs() */
1104
1105                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1106                         ether_type = hdr->ff.ether_type;
1107                         dgl = hdr->ff.dgl;
1108                         dg_size = hdr->ff.dg_size + 1;
1109                         fg_off = 0;
1110                 } else {
1111                         hdr->words.word2 = ntohs(hdr->words.word2);
1112                         dgl = hdr->sf.dgl;
1113                         dg_size = hdr->sf.dg_size + 1;
1114                         fg_off = hdr->sf.fg_off;
1115                 }
1116                 spin_lock_irqsave(&pdg->lock, flags);
1117
1118                 pdgl = &(pdg->list);
1119                 lh = find_partial_datagram(pdgl, dgl);
1120
1121                 if (lh == NULL) {
1122                         while (pdg->sz >= max_partial_datagrams) {
1123                                 /* remove the oldest */
1124                                 purge_partial_datagram(pdgl->prev);
1125                                 pdg->sz--;
1126                         }
1127
1128                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1129                                                       buf + hdr_len, fg_off,
1130                                                       fg_len);
1131                         if (retval < 0) {
1132                                 spin_unlock_irqrestore(&pdg->lock, flags);
1133                                 goto bad_proto;
1134                         }
1135                         pdg->sz++;
1136                         lh = find_partial_datagram(pdgl, dgl);
1137                 } else {
1138                         struct partial_datagram *pd;
1139
1140                         pd = list_entry(lh, struct partial_datagram, list);
1141
1142                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1143                                 /* Overlapping fragments, obliterate old
1144                                  * datagram and start new one. */
1145                                 purge_partial_datagram(lh);
1146                                 retval = new_partial_datagram(dev, pdgl, dgl,
1147                                                               dg_size,
1148                                                               buf + hdr_len,
1149                                                               fg_off, fg_len);
1150                                 if (retval < 0) {
1151                                         pdg->sz--;
1152                                         spin_unlock_irqrestore(&pdg->lock, flags);
1153                                         goto bad_proto;
1154                                 }
1155                         } else {
1156                                 retval = update_partial_datagram(pdgl, lh,
1157                                                                  buf + hdr_len,
1158                                                                  fg_off, fg_len);
1159                                 if (retval < 0) {
1160                                         /* Couldn't save off fragment anyway
1161                                          * so might as well obliterate the
1162                                          * datagram now. */
1163                                         purge_partial_datagram(lh);
1164                                         pdg->sz--;
1165                                         spin_unlock_irqrestore(&pdg->lock, flags);
1166                                         goto bad_proto;
1167                                 }
1168                         } /* fragment overlap */
1169                 } /* new datagram or add to existing one */
1170
1171                 pd = list_entry(lh, struct partial_datagram, list);
1172
1173                 if (hdr->common.lf == ETH1394_HDR_LF_FF)
1174                         pd->ether_type = ether_type;
1175
1176                 if (is_datagram_complete(lh, dg_size)) {
1177                         ether_type = pd->ether_type;
1178                         pdg->sz--;
1179                         skb = skb_get(pd->skb);
1180                         purge_partial_datagram(lh);
1181                         spin_unlock_irqrestore(&pdg->lock, flags);
1182                 } else {
1183                         /* Datagram is not complete, we're done for the
1184                          * moment. */
1185                         spin_unlock_irqrestore(&pdg->lock, flags);
1186                         return 0;
1187                 }
1188         } /* unframgented datagram or fragmented one */
1189
1190         /* Write metadata, and then pass to the receive level */
1191         skb->dev = dev;
1192         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1193
1194         /* Parse the encapsulation header. This actually does the job of
1195          * converting to an ethernet frame header, aswell as arp
1196          * conversion if needed. ARP conversion is easier in this
1197          * direction, since we are using ethernet as our backend.  */
1198         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1199                                               ether_type);
1200
1201         spin_lock_irqsave(&priv->lock, flags);
1202
1203         if (!skb->protocol) {
1204                 priv->stats.rx_errors++;
1205                 priv->stats.rx_dropped++;
1206                 dev_kfree_skb_any(skb);
1207                 goto bad_proto;
1208         }
1209
1210         if (netif_rx(skb) == NET_RX_DROP) {
1211                 priv->stats.rx_errors++;
1212                 priv->stats.rx_dropped++;
1213                 goto bad_proto;
1214         }
1215
1216         /* Statistics */
1217         priv->stats.rx_packets++;
1218         priv->stats.rx_bytes += skb->len;
1219
1220 bad_proto:
1221         if (netif_queue_stopped(dev))
1222                 netif_wake_queue(dev);
1223         spin_unlock_irqrestore(&priv->lock, flags);
1224
1225         dev->last_rx = jiffies;
1226
1227         return 0;
1228 }
1229
1230 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1231                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1232 {
1233         struct eth1394_host_info *hi;
1234
1235         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1236         if (hi == NULL) {
1237                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1238                                 host->id);
1239                 return RCODE_ADDRESS_ERROR;
1240         }
1241
1242         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1243                 return RCODE_ADDRESS_ERROR;
1244         else
1245                 return RCODE_COMPLETE;
1246 }
1247
1248 static void ether1394_iso(struct hpsb_iso *iso)
1249 {
1250         quadlet_t *data;
1251         char *buf;
1252         struct eth1394_host_info *hi;
1253         struct net_device *dev;
1254         struct eth1394_priv *priv;
1255         unsigned int len;
1256         u32 specifier_id;
1257         u16 source_id;
1258         int i;
1259         int nready;
1260
1261         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1262         if (hi == NULL) {
1263                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1264                                 iso->host->id);
1265                 return;
1266         }
1267
1268         dev = hi->dev;
1269
1270         nready = hpsb_iso_n_ready(iso);
1271         for (i = 0; i < nready; i++) {
1272                 struct hpsb_iso_packet_info *info =
1273                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1274                 data = (quadlet_t *)(iso->data_buf.kvirt + info->offset);
1275
1276                 /* skip over GASP header */
1277                 buf = (char *)data + 8;
1278                 len = info->len - 8;
1279
1280                 specifier_id = (be32_to_cpu(data[0]) & 0xffff) << 8 |
1281                                (be32_to_cpu(data[1]) & 0xff000000) >> 24;
1282                 source_id = be32_to_cpu(data[0]) >> 16;
1283
1284                 priv = netdev_priv(dev);
1285
1286                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f)
1287                     || specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1288                         /* This packet is not for us */
1289                         continue;
1290                 }
1291                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1292                                        buf, len);
1293         }
1294
1295         hpsb_iso_recv_release_packets(iso, i);
1296
1297         dev->last_rx = jiffies;
1298 }
1299
1300 /******************************************
1301  * Datagram transmission code
1302  ******************************************/
1303
1304 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1305  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1306  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1307  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1308  * judge.
1309  *
1310  * Now that the EUI is used for the hardware address all we need to do to make
1311  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1312  * speed, and unicast FIFO address information between the sender_unique_id
1313  * and the IP addresses.
1314  */
1315 static void ether1394_arp_to_1394arp(struct sk_buff *skb,
1316                                      struct net_device *dev)
1317 {
1318         struct eth1394_priv *priv = netdev_priv(dev);
1319         struct arphdr *arp = (struct arphdr *)skb->data;
1320         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1321         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1322
1323         arp1394->hw_addr_len    = 16;
1324         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1325         arp1394->max_rec        = priv->host->csr.max_rec;
1326         arp1394->sspd           = priv->host->csr.lnk_spd;
1327         arp1394->fifo_hi        = htons(priv->local_fifo >> 32);
1328         arp1394->fifo_lo        = htonl(priv->local_fifo & ~0x0);
1329 }
1330
1331 /* We need to encapsulate the standard header with our own. We use the
1332  * ethernet header's proto for our own. */
1333 static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1334                                                __be16 proto,
1335                                                union eth1394_hdr *hdr,
1336                                                u16 dg_size, u16 dgl)
1337 {
1338         unsigned int adj_max_payload =
1339                                 max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1340
1341         /* Does it all fit in one packet? */
1342         if (dg_size <= adj_max_payload) {
1343                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1344                 hdr->uf.ether_type = proto;
1345         } else {
1346                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1347                 hdr->ff.ether_type = proto;
1348                 hdr->ff.dg_size = dg_size - 1;
1349                 hdr->ff.dgl = dgl;
1350                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1351         }
1352         return (dg_size + adj_max_payload - 1) / adj_max_payload;
1353 }
1354
1355 static unsigned int ether1394_encapsulate(struct sk_buff *skb,
1356                                           unsigned int max_payload,
1357                                           union eth1394_hdr *hdr)
1358 {
1359         union eth1394_hdr *bufhdr;
1360         int ftype = hdr->common.lf;
1361         int hdrsz = hdr_type_len[ftype];
1362         unsigned int adj_max_payload = max_payload - hdrsz;
1363
1364         switch (ftype) {
1365         case ETH1394_HDR_LF_UF:
1366                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1367                 bufhdr->words.word1 = htons(hdr->words.word1);
1368                 bufhdr->words.word2 = hdr->words.word2;
1369                 break;
1370
1371         case ETH1394_HDR_LF_FF:
1372                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1373                 bufhdr->words.word1 = htons(hdr->words.word1);
1374                 bufhdr->words.word2 = hdr->words.word2;
1375                 bufhdr->words.word3 = htons(hdr->words.word3);
1376                 bufhdr->words.word4 = 0;
1377
1378                 /* Set frag type here for future interior fragments */
1379                 hdr->common.lf = ETH1394_HDR_LF_IF;
1380                 hdr->sf.fg_off = 0;
1381                 break;
1382
1383         default:
1384                 hdr->sf.fg_off += adj_max_payload;
1385                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1386                 if (max_payload >= skb->len)
1387                         hdr->common.lf = ETH1394_HDR_LF_LF;
1388                 bufhdr->words.word1 = htons(hdr->words.word1);
1389                 bufhdr->words.word2 = htons(hdr->words.word2);
1390                 bufhdr->words.word3 = htons(hdr->words.word3);
1391                 bufhdr->words.word4 = 0;
1392         }
1393         return min(max_payload, skb->len);
1394 }
1395
1396 static struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1397 {
1398         struct hpsb_packet *p;
1399
1400         p = hpsb_alloc_packet(0);
1401         if (p) {
1402                 p->host = host;
1403                 p->generation = get_hpsb_generation(host);
1404                 p->type = hpsb_async;
1405         }
1406         return p;
1407 }
1408
1409 static int ether1394_prep_write_packet(struct hpsb_packet *p,
1410                                        struct hpsb_host *host, nodeid_t node,
1411                                        u64 addr, void *data, int tx_len)
1412 {
1413         p->node_id = node;
1414         p->data = NULL;
1415
1416         p->tcode = TCODE_WRITEB;
1417         p->header[1] = host->node_id << 16 | addr >> 32;
1418         p->header[2] = addr & 0xffffffff;
1419
1420         p->header_size = 16;
1421         p->expect_response = 1;
1422
1423         if (hpsb_get_tlabel(p)) {
1424                 ETH1394_PRINT_G(KERN_ERR, "Out of tlabels\n");
1425                 return -1;
1426         }
1427         p->header[0] =
1428                 p->node_id << 16 | p->tlabel << 10 | 1 << 8 | TCODE_WRITEB << 4;
1429
1430         p->header[3] = tx_len << 16;
1431         p->data_size = (tx_len + 3) & ~3;
1432         p->data = data;
1433
1434         return 0;
1435 }
1436
1437 static void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1438                                        struct eth1394_priv *priv,
1439                                        struct sk_buff *skb, int length)
1440 {
1441         p->header_size = 4;
1442         p->tcode = TCODE_STREAM_DATA;
1443
1444         p->header[0] = length << 16 | 3 << 14 | priv->broadcast_channel << 8 |
1445                        TCODE_STREAM_DATA << 4;
1446         p->data_size = length;
1447         p->data = (quadlet_t *)skb->data - 2;
1448         p->data[0] = cpu_to_be32(priv->host->node_id << 16 |
1449                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1450         p->data[1] = cpu_to_be32(ETHER1394_GASP_SPECIFIER_ID_LO << 24 |
1451                                  ETHER1394_GASP_VERSION);
1452
1453         /* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
1454          * prevents hpsb_send_packet() from setting the speed to an arbitrary
1455          * value based on packet->node_id if packet->node_id is not set. */
1456         p->node_id = ALL_NODES;
1457         p->speed_code = priv->bc_sspd;
1458 }
1459
1460 static void ether1394_free_packet(struct hpsb_packet *packet)
1461 {
1462         if (packet->tcode != TCODE_STREAM_DATA)
1463                 hpsb_free_tlabel(packet);
1464         hpsb_free_packet(packet);
1465 }
1466
1467 static void ether1394_complete_cb(void *__ptask);
1468
1469 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1470 {
1471         struct eth1394_priv *priv = ptask->priv;
1472         struct hpsb_packet *packet = NULL;
1473
1474         packet = ether1394_alloc_common_packet(priv->host);
1475         if (!packet)
1476                 return -1;
1477
1478         if (ptask->tx_type == ETH1394_GASP) {
1479                 int length = tx_len + 2 * sizeof(quadlet_t);
1480
1481                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1482         } else if (ether1394_prep_write_packet(packet, priv->host,
1483                                                ptask->dest_node,
1484                                                ptask->addr, ptask->skb->data,
1485                                                tx_len)) {
1486                 hpsb_free_packet(packet);
1487                 return -1;
1488         }
1489
1490         ptask->packet = packet;
1491         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1492                                       ptask);
1493
1494         if (hpsb_send_packet(packet) < 0) {
1495                 ether1394_free_packet(packet);
1496                 return -1;
1497         }
1498
1499         return 0;
1500 }
1501
1502 /* Task function to be run when a datagram transmission is completed */
1503 static void ether1394_dg_complete(struct packet_task *ptask, int fail)
1504 {
1505         struct sk_buff *skb = ptask->skb;
1506         struct eth1394_priv *priv = netdev_priv(skb->dev);
1507         unsigned long flags;
1508
1509         /* Statistics */
1510         spin_lock_irqsave(&priv->lock, flags);
1511         if (fail) {
1512                 priv->stats.tx_dropped++;
1513                 priv->stats.tx_errors++;
1514         } else {
1515                 priv->stats.tx_bytes += skb->len;
1516                 priv->stats.tx_packets++;
1517         }
1518         spin_unlock_irqrestore(&priv->lock, flags);
1519
1520         dev_kfree_skb_any(skb);
1521         kmem_cache_free(packet_task_cache, ptask);
1522 }
1523
1524 /* Callback for when a packet has been sent and the status of that packet is
1525  * known */
1526 static void ether1394_complete_cb(void *__ptask)
1527 {
1528         struct packet_task *ptask = (struct packet_task *)__ptask;
1529         struct hpsb_packet *packet = ptask->packet;
1530         int fail = 0;
1531
1532         if (packet->tcode != TCODE_STREAM_DATA)
1533                 fail = hpsb_packet_success(packet);
1534
1535         ether1394_free_packet(packet);
1536
1537         ptask->outstanding_pkts--;
1538         if (ptask->outstanding_pkts > 0 && !fail) {
1539                 int tx_len;
1540
1541                 /* Add the encapsulation header to the fragment */
1542                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1543                                                &ptask->hdr);
1544                 if (ether1394_send_packet(ptask, tx_len))
1545                         ether1394_dg_complete(ptask, 1);
1546         } else {
1547                 ether1394_dg_complete(ptask, fail);
1548         }
1549 }
1550
1551 /* Transmit a packet (called by kernel) */
1552 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
1553 {
1554         gfp_t kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
1555         struct eth1394hdr *eth;
1556         struct eth1394_priv *priv = netdev_priv(dev);
1557         __be16 proto;
1558         unsigned long flags;
1559         nodeid_t dest_node;
1560         eth1394_tx_type tx_type;
1561         int ret = 0;
1562         unsigned int tx_len;
1563         unsigned int max_payload;
1564         u16 dg_size;
1565         u16 dgl;
1566         struct packet_task *ptask;
1567         struct eth1394_node_ref *node;
1568         struct eth1394_node_info *node_info = NULL;
1569
1570         ptask = kmem_cache_alloc(packet_task_cache, kmflags);
1571         if (ptask == NULL) {
1572                 ret = -ENOMEM;
1573                 goto fail;
1574         }
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                 ret = -EAGAIN;
1582                 goto fail;
1583         }
1584 #endif
1585
1586         skb = skb_share_check(skb, kmflags);
1587         if (!skb) {
1588                 ret = -ENOMEM;
1589                 goto fail;
1590         }
1591
1592         /* Get rid of the fake eth1394 header, but save a pointer */
1593         eth = (struct eth1394hdr *)skb->data;
1594         skb_pull(skb, ETH1394_HLEN);
1595
1596         proto = eth->h_proto;
1597         dg_size = skb->len;
1598
1599         /* Set the transmission type for the packet.  ARP packets and IP
1600          * broadcast packets are sent via GASP. */
1601         if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1602             proto == htons(ETH_P_ARP) ||
1603             (proto == htons(ETH_P_IP) &&
1604              IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1605                 tx_type = ETH1394_GASP;
1606                 dest_node = LOCAL_BUS | ALL_NODES;
1607                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1608                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1609                 dgl = priv->bc_dgl;
1610                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1611                         priv->bc_dgl++;
1612         } else {
1613                 __be64 guid = get_unaligned((u64 *)eth->h_dest);
1614
1615                 node = eth1394_find_node_guid(&priv->ip_node_list,
1616                                               be64_to_cpu(guid));
1617                 if (!node) {
1618                         ret = -EAGAIN;
1619                         goto fail;
1620                 }
1621                 node_info =
1622                     (struct eth1394_node_info *)node->ud->device.driver_data;
1623                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE) {
1624                         ret = -EAGAIN;
1625                         goto fail;
1626                 }
1627
1628                 dest_node = node->ud->ne->nodeid;
1629                 max_payload = node_info->maxpayload;
1630                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1631
1632                 dgl = node_info->dgl;
1633                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1634                         node_info->dgl++;
1635                 tx_type = ETH1394_WRREQ;
1636         }
1637
1638         /* If this is an ARP packet, convert it */
1639         if (proto == htons(ETH_P_ARP))
1640                 ether1394_arp_to_1394arp(skb, dev);
1641
1642         ptask->hdr.words.word1 = 0;
1643         ptask->hdr.words.word2 = 0;
1644         ptask->hdr.words.word3 = 0;
1645         ptask->hdr.words.word4 = 0;
1646         ptask->skb = skb;
1647         ptask->priv = priv;
1648         ptask->tx_type = tx_type;
1649
1650         if (tx_type != ETH1394_GASP) {
1651                 u64 addr;
1652
1653                 spin_lock_irqsave(&priv->lock, flags);
1654                 addr = node_info->fifo;
1655                 spin_unlock_irqrestore(&priv->lock, flags);
1656
1657                 ptask->addr = addr;
1658                 ptask->dest_node = dest_node;
1659         }
1660
1661         ptask->tx_type = tx_type;
1662         ptask->max_payload = max_payload;
1663         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload,
1664                                         proto, &ptask->hdr, dg_size, dgl);
1665
1666         /* Add the encapsulation header to the fragment */
1667         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1668         dev->trans_start = jiffies;
1669         if (ether1394_send_packet(ptask, tx_len))
1670                 goto fail;
1671
1672         netif_wake_queue(dev);
1673         return 0;
1674 fail:
1675         if (ptask)
1676                 kmem_cache_free(packet_task_cache, ptask);
1677
1678         if (skb != NULL)
1679                 dev_kfree_skb(skb);
1680
1681         spin_lock_irqsave(&priv->lock, flags);
1682         priv->stats.tx_dropped++;
1683         priv->stats.tx_errors++;
1684         spin_unlock_irqrestore(&priv->lock, flags);
1685
1686         if (netif_queue_stopped(dev))
1687                 netif_wake_queue(dev);
1688
1689         return 0;  /* returning non-zero causes serious problems */
1690 }
1691
1692 static void ether1394_get_drvinfo(struct net_device *dev,
1693                                   struct ethtool_drvinfo *info)
1694 {
1695         strcpy(info->driver, driver_name);
1696         strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */
1697 }
1698
1699 static struct ethtool_ops ethtool_ops = {
1700         .get_drvinfo = ether1394_get_drvinfo
1701 };
1702
1703 static int __init ether1394_init_module (void)
1704 {
1705         packet_task_cache = kmem_cache_create("packet_task",
1706                                               sizeof(struct packet_task),
1707                                               0, 0, NULL, NULL);
1708
1709         hpsb_register_highlevel(&eth1394_highlevel);
1710         return hpsb_register_protocol(&eth1394_proto_driver);
1711 }
1712
1713 static void __exit ether1394_exit_module (void)
1714 {
1715         hpsb_unregister_protocol(&eth1394_proto_driver);
1716         hpsb_unregister_highlevel(&eth1394_highlevel);
1717         kmem_cache_destroy(packet_task_cache);
1718 }
1719
1720 module_init(ether1394_init_module);
1721 module_exit(ether1394_exit_module);