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 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 const 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         /* flush priv->wake */
 242         flush_scheduled_work();
 243
 244         netif_stop_queue(dev);
 245         return 0;
 246 }
 247
 248 /* FIXME: What to do if we timeout? I think a host reset is probably in order,
 249  * so that's what we do. Should we increment the stat counters too?  */
 250 static void ether1394_tx_timeout(struct net_device *dev)
 251 {
 252         struct hpsb_host *host =
 253                         ((struct eth1394_priv *)netdev_priv(dev))->host;
 254
 255         ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
 256         ether1394_host_reset(host);
 257 }
 258
 259 static inline int ether1394_max_mtu(struct hpsb_host* host)
 260 {
 261         return (1 << (host->csr.max_rec + 1))
 262                         - sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
 263 }
 264
 265 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 266 {
 267         int max_mtu;
 268
 269         if (new_mtu < 68)
 270                 return -EINVAL;
 271
 272         max_mtu = ether1394_max_mtu(
 273                         ((struct eth1394_priv *)netdev_priv(dev))->host);
 274         if (new_mtu > max_mtu) {
 275                 ETH1394_PRINT(KERN_INFO, dev->name,
 276                               "Local node constrains MTU to %d\n", max_mtu);
 277                 return -ERANGE;
 278         }
 279
 280         dev->mtu = new_mtu;
 281         return 0;
 282 }
 283
 284 static void purge_partial_datagram(struct list_head *old)
 285 {
 286         struct partial_datagram *pd;
 287         struct list_head *lh, *n;
 288         struct fragment_info *fi;
 289
 290         pd = list_entry(old, struct partial_datagram, list);
 291
 292         list_for_each_safe(lh, n, &pd->frag_info) {
 293                 fi = list_entry(lh, struct fragment_info, list);
 294                 list_del(lh);
 295                 kfree(fi);
 296         }
 297         list_del(old);
 298         kfree_skb(pd->skb);
 299         kfree(pd);
 300 }
 301
 302 /******************************************
 303  * 1394 bus activity functions
 304  ******************************************/
 305
 306 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 307                                                   struct unit_directory *ud)
 308 {
 309         struct eth1394_node_ref *node;
 310
 311         list_for_each_entry(node, inl, list)
 312                 if (node->ud == ud)
 313                         return node;
 314
 315         return NULL;
 316 }
 317
 318 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 319                                                        u64 guid)
 320 {
 321         struct eth1394_node_ref *node;
 322
 323         list_for_each_entry(node, inl, list)
 324                 if (node->ud->ne->guid == guid)
 325                         return node;
 326
 327         return NULL;
 328 }
 329
 330 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 331                                                          nodeid_t nodeid)
 332 {
 333         struct eth1394_node_ref *node;
 334
 335         list_for_each_entry(node, inl, list)
 336                 if (node->ud->ne->nodeid == nodeid)
 337                         return node;
 338
 339         return NULL;
 340 }
 341
 342 static int eth1394_new_node(struct eth1394_host_info *hi,
 343                             struct unit_directory *ud)
 344 {
 345         struct eth1394_priv *priv;
 346         struct eth1394_node_ref *new_node;
 347         struct eth1394_node_info *node_info;
 348
 349         new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
 350         if (!new_node)
 351                 return -ENOMEM;
 352
 353         node_info = kmalloc(sizeof(*node_info), GFP_KERNEL);
 354         if (!node_info) {
 355                 kfree(new_node);
 356                 return -ENOMEM;
 357         }
 358
 359         spin_lock_init(&node_info->pdg.lock);
 360         INIT_LIST_HEAD(&node_info->pdg.list);
 361         node_info->pdg.sz = 0;
 362         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 363
 364         dev_set_drvdata(&ud->device, node_info);
 365         new_node->ud = ud;
 366
 367         priv = netdev_priv(hi->dev);
 368         list_add_tail(&new_node->list, &priv->ip_node_list);
 369         return 0;
 370 }
 371
 372 static int eth1394_probe(struct device *dev)
 373 {
 374         struct unit_directory *ud;
 375         struct eth1394_host_info *hi;
 376
 377         ud = container_of(dev, struct unit_directory, device);
 378         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 379         if (!hi)
 380                 return -ENOENT;
 381
 382         return eth1394_new_node(hi, ud);
 383 }
 384
 385 static int eth1394_remove(struct device *dev)
 386 {
 387         struct unit_directory *ud;
 388         struct eth1394_host_info *hi;
 389         struct eth1394_priv *priv;
 390         struct eth1394_node_ref *old_node;
 391         struct eth1394_node_info *node_info;
 392         struct list_head *lh, *n;
 393         unsigned long flags;
 394
 395         ud = container_of(dev, struct unit_directory, device);
 396         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 397         if (!hi)
 398                 return -ENOENT;
 399
 400         priv = netdev_priv(hi->dev);
 401
 402         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 403         if (!old_node)
 404                 return 0;
 405
 406         list_del(&old_node->list);
 407         kfree(old_node);
 408
 409         node_info = dev_get_drvdata(&ud->device);
 410
 411         spin_lock_irqsave(&node_info->pdg.lock, flags);
 412         /* The partial datagram list should be empty, but we'll just
 413          * make sure anyway... */
 414         list_for_each_safe(lh, n, &node_info->pdg.list)
 415                 purge_partial_datagram(lh);
 416         spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 417
 418         kfree(node_info);
 419         dev_set_drvdata(&ud->device, NULL);
 420         return 0;
 421 }
 422
 423 static int eth1394_update(struct unit_directory *ud)
 424 {
 425         struct eth1394_host_info *hi;
 426         struct eth1394_priv *priv;
 427         struct eth1394_node_ref *node;
 428
 429         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 430         if (!hi)
 431                 return -ENOENT;
 432
 433         priv = netdev_priv(hi->dev);
 434         node = eth1394_find_node(&priv->ip_node_list, ud);
 435         if (node)
 436                 return 0;
 437
 438         return eth1394_new_node(hi, ud);
 439 }
 440
 441 static const struct ieee1394_device_id eth1394_id_table[] = {
 442         {
 443                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 444                                 IEEE1394_MATCH_VERSION),
 445                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 446                 .version = ETHER1394_GASP_VERSION,
 447         },
 448         {}
 449 };
 450
 451 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 452
 453 static struct hpsb_protocol_driver eth1394_proto_driver = {
 454         .name           = driver_name,
 455         .id_table       = eth1394_id_table,
 456         .update         = eth1394_update,
 457         .driver         = {
 458                 .probe          = eth1394_probe,
 459                 .remove         = eth1394_remove,
 460         },
 461 };
 462
 463 static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
 464 {
 465         unsigned long flags;
 466         int i;
 467         struct eth1394_priv *priv = netdev_priv(dev);
 468         struct hpsb_host *host = priv->host;
 469         u64 guid = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
 470         int max_speed = IEEE1394_SPEED_MAX;
 471
 472         spin_lock_irqsave(&priv->lock, flags);
 473
 474         memset(priv->ud_list, 0, sizeof(priv->ud_list));
 475         priv->bc_maxpayload = 512;
 476
 477         /* Determine speed limit */
 478         /* FIXME: This is broken for nodes with link speed < PHY speed,
 479          * and it is suboptimal for S200B...S800B hardware.
 480          * The result of nodemgr's speed probe should be used somehow. */
 481         for (i = 0; i < host->node_count; i++) {
 482                 /* take care of S100B...S400B PHY ports */
 483                 if (host->speed[i] == SELFID_SPEED_UNKNOWN) {
 484                         max_speed = IEEE1394_SPEED_100;
 485                         break;
 486                 }
 487                 if (max_speed > host->speed[i])
 488                         max_speed = host->speed[i];
 489         }
 490         priv->bc_sspd = max_speed;
 491
 492         if (set_mtu) {
 493                 /* Use the RFC 2734 default 1500 octets or the maximum payload
 494                  * as initial MTU */
 495                 dev->mtu = min(1500, ether1394_max_mtu(host));
 496
 497                 /* Set our hardware address while we're at it */
 498                 memcpy(dev->dev_addr, &guid, sizeof(u64));
 499                 memset(dev->broadcast, 0xff, sizeof(u64));
 500         }
 501
 502         spin_unlock_irqrestore(&priv->lock, flags);
 503 }
 504
 505 static const struct header_ops ether1394_header_ops = {
 506         .create         = ether1394_header,
 507         .rebuild        = ether1394_rebuild_header,
 508         .cache          = ether1394_header_cache,
 509         .cache_update   = ether1394_header_cache_update,
 510         .parse          = ether1394_header_parse,
 511 };
 512
 513 static const struct net_device_ops ether1394_netdev_ops = {
 514         .ndo_open       = ether1394_open,
 515         .ndo_stop       = ether1394_stop,
 516         .ndo_start_xmit = ether1394_tx,
 517         .ndo_tx_timeout = ether1394_tx_timeout,
 518         .ndo_change_mtu = ether1394_change_mtu,
 519 };
 520
 521 static void ether1394_init_dev(struct net_device *dev)
 522 {
 523
 524         dev->header_ops         = &ether1394_header_ops;
 525         dev->netdev_ops         = &ether1394_netdev_ops;
 526
 527         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 528
 529         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 530         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 531         dev->features           = NETIF_F_HIGHDMA;
 532         dev->addr_len           = ETH1394_ALEN;
 533         dev->hard_header_len    = ETH1394_HLEN;
 534         dev->type               = ARPHRD_IEEE1394;
 535
 536         /* FIXME: This value was copied from ether_setup(). Is it too much? */
 537         dev->tx_queue_len       = 1000;
 538 }
 539
 540 /*
 541  * Wake the queue up after commonly encountered transmit failure conditions are
 542  * hopefully over.  Currently only tlabel exhaustion is accounted for.
 543  */
 544 static void ether1394_wake_queue(struct work_struct *work)
 545 {
 546         struct eth1394_priv *priv;
 547         struct hpsb_packet *packet;
 548
 549         priv = container_of(work, struct eth1394_priv, wake);
 550         packet = hpsb_alloc_packet(0);
 551
 552         /* This is really bad, but unjam the queue anyway. */
 553         if (!packet)
 554                 goto out;
 555
 556         packet->host = priv->host;
 557         packet->node_id = priv->wake_node;
 558         /*
 559          * A transaction label is all we really want.  If we get one, it almost
 560          * always means we can get a lot more because the ieee1394 core recycled
 561          * a whole batch of tlabels, at last.
 562          */
 563         if (hpsb_get_tlabel(packet) == 0)
 564                 hpsb_free_tlabel(packet);
 565
 566         hpsb_free_packet(packet);
 567 out:
 568         netif_wake_queue(priv->wake_dev);
 569 }
 570
 571 /*
 572  * This function is called every time a card is found. It is generally called
 573  * when the module is installed. This is where we add all of our ethernet
 574  * devices. One for each host.
 575  */
 576 static void ether1394_add_host(struct hpsb_host *host)
 577 {
 578         struct eth1394_host_info *hi = NULL;
 579         struct net_device *dev = NULL;
 580         struct eth1394_priv *priv;
 581         u64 fifo_addr;
 582
 583         if (hpsb_config_rom_ip1394_add(host) != 0) {
 584                 ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
 585                 return;
 586         }
 587
 588         fifo_addr = hpsb_allocate_and_register_addrspace(
 589                         &eth1394_highlevel, host, &addr_ops,
 590                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 591                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 592         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
 593                 ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
 594                 hpsb_config_rom_ip1394_remove(host);
 595                 return;
 596         }
 597
 598         dev = alloc_netdev(sizeof(*priv), "eth%d", ether1394_init_dev);
 599         if (dev == NULL) {
 600                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 601                 goto out;
 602         }
 603
 604         SET_NETDEV_DEV(dev, &host->device);
 605
 606         priv = netdev_priv(dev);
 607         INIT_LIST_HEAD(&priv->ip_node_list);
 608         spin_lock_init(&priv->lock);
 609         priv->host = host;
 610         priv->local_fifo = fifo_addr;
 611         INIT_WORK(&priv->wake, ether1394_wake_queue);
 612         priv->wake_dev = dev;
 613
 614         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 615         if (hi == NULL) {
 616                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 617                 goto out;
 618         }
 619
 620         ether1394_reset_priv(dev, 1);
 621
 622         if (register_netdev(dev)) {
 623                 ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
 624                 goto out;
 625         }
 626
 627         ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (fw-host%d)\n",
 628                       host->id);
 629
 630         hi->host = host;
 631         hi->dev = dev;
 632
 633         /* Ignore validity in hopes that it will be set in the future.  It'll
 634          * be checked when the eth device is opened. */
 635         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 636
 637         ether1394_recv_init(priv);
 638         return;
 639 out:
 640         if (dev)
 641                 free_netdev(dev);
 642         if (hi)
 643                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 644         hpsb_unregister_addrspace(&eth1394_highlevel, host, fifo_addr);
 645         hpsb_config_rom_ip1394_remove(host);
 646 }
 647
 648 /* Remove a card from our list */
 649 static void ether1394_remove_host(struct hpsb_host *host)
 650 {
 651         struct eth1394_host_info *hi;
 652         struct eth1394_priv *priv;
 653
 654         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 655         if (!hi)
 656                 return;
 657         priv = netdev_priv(hi->dev);
 658         hpsb_unregister_addrspace(&eth1394_highlevel, host, priv->local_fifo);
 659         hpsb_config_rom_ip1394_remove(host);
 660         if (priv->iso)
 661                 hpsb_iso_shutdown(priv->iso);
 662         unregister_netdev(hi->dev);
 663         free_netdev(hi->dev);
 664 }
 665
 666 /* A bus reset happened */
 667 static void ether1394_host_reset(struct hpsb_host *host)
 668 {
 669         struct eth1394_host_info *hi;
 670         struct eth1394_priv *priv;
 671         struct net_device *dev;
 672         struct list_head *lh, *n;
 673         struct eth1394_node_ref *node;
 674         struct eth1394_node_info *node_info;
 675         unsigned long flags;
 676
 677         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 678
 679         /* This can happen for hosts that we don't use */
 680         if (!hi)
 681                 return;
 682
 683         dev = hi->dev;
 684         priv = netdev_priv(dev);
 685
 686         /* Reset our private host data, but not our MTU */
 687         netif_stop_queue(dev);
 688         ether1394_reset_priv(dev, 0);
 689
 690         list_for_each_entry(node, &priv->ip_node_list, list) {
 691                 node_info = dev_get_drvdata(&node->ud->device);
 692
 693                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 694
 695                 list_for_each_safe(lh, n, &node_info->pdg.list)
 696                         purge_partial_datagram(lh);
 697
 698                 INIT_LIST_HEAD(&(node_info->pdg.list));
 699                 node_info->pdg.sz = 0;
 700
 701                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 702         }
 703
 704         netif_wake_queue(dev);
 705 }
 706
 707 /******************************************
 708  * HW Header net device functions
 709  ******************************************/
 710 /* These functions have been adapted from net/ethernet/eth.c */
 711
 712 /* Create a fake MAC header for an arbitrary protocol layer.
 713  * saddr=NULL means use device source address
 714  * daddr=NULL means leave destination address (eg unresolved arp). */
 715 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 716                             unsigned short type, const void *daddr,
 717                             const void *saddr, unsigned len)
 718 {
 719         struct eth1394hdr *eth =
 720                         (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 721
 722         eth->h_proto = htons(type);
 723
 724         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 725                 memset(eth->h_dest, 0, dev->addr_len);
 726                 return dev->hard_header_len;
 727         }
 728
 729         if (daddr) {
 730                 memcpy(eth->h_dest, daddr, dev->addr_len);
 731                 return dev->hard_header_len;
 732         }
 733
 734         return -dev->hard_header_len;
 735 }
 736
 737 /* Rebuild the faked MAC header. This is called after an ARP
 738  * (or in future other address resolution) has completed on this
 739  * sk_buff. We now let ARP fill in the other fields.
 740  *
 741  * This routine CANNOT use cached dst->neigh!
 742  * Really, it is used only when dst->neigh is wrong.
 743  */
 744 static int ether1394_rebuild_header(struct sk_buff *skb)
 745 {
 746         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 747
 748         if (eth->h_proto == htons(ETH_P_IP))
 749                 return arp_find((unsigned char *)&eth->h_dest, skb);
 750
 751         ETH1394_PRINT(KERN_DEBUG, skb->dev->name,
 752                       "unable to resolve type %04x addresses\n",
 753                       ntohs(eth->h_proto));
 754         return 0;
 755 }
 756
 757 static int ether1394_header_parse(const struct sk_buff *skb,
 758                                   unsigned char *haddr)
 759 {
 760         memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
 761         return ETH1394_ALEN;
 762 }
 763
 764 static int ether1394_header_cache(const struct neighbour *neigh,
 765                                   struct hh_cache *hh)
 766 {
 767         __be16 type = hh->hh_type;
 768         struct net_device *dev = neigh->dev;
 769         struct eth1394hdr *eth =
 770                 (struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
 771
 772         if (type == htons(ETH_P_802_3))
 773                 return -1;
 774
 775         eth->h_proto = type;
 776         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 777
 778         hh->hh_len = ETH1394_HLEN;
 779         return 0;
 780 }
 781
 782 /* Called by Address Resolution module to notify changes in address. */
 783 static void ether1394_header_cache_update(struct hh_cache *hh,
 784                                           const struct net_device *dev,
 785                                           const unsigned char * haddr)
 786 {
 787         memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
 788 }
 789
 790 /******************************************
 791  * Datagram reception code
 792  ******************************************/
 793
 794 /* Copied from net/ethernet/eth.c */
 795 static __be16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
 796 {
 797         struct eth1394hdr *eth;
 798         unsigned char *rawp;
 799
 800         skb_reset_mac_header(skb);
 801         skb_pull(skb, ETH1394_HLEN);
 802         eth = eth1394_hdr(skb);
 803
 804         if (*eth->h_dest & 1) {
 805                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len) == 0)
 806                         skb->pkt_type = PACKET_BROADCAST;
 807 #if 0
 808                 else
 809                         skb->pkt_type = PACKET_MULTICAST;
 810 #endif
 811         } else {
 812                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 813                         skb->pkt_type = PACKET_OTHERHOST;
 814         }
 815
 816         if (ntohs(eth->h_proto) >= 1536)
 817                 return eth->h_proto;
 818
 819         rawp = skb->data;
 820
 821         if (*(unsigned short *)rawp == 0xFFFF)
 822                 return htons(ETH_P_802_3);
 823
 824         return htons(ETH_P_802_2);
 825 }
 826
 827 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 828  * We also perform ARP translation here, if need be.  */
 829 static __be16 ether1394_parse_encap(struct sk_buff *skb, struct net_device *dev,
 830                                  nodeid_t srcid, nodeid_t destid,
 831                                  __be16 ether_type)
 832 {
 833         struct eth1394_priv *priv = netdev_priv(dev);
 834         __be64 dest_hw;
 835         __be16 ret = 0;
 836
 837         /* Setup our hw addresses. We use these to build the ethernet header. */
 838         if (destid == (LOCAL_BUS | ALL_NODES))
 839                 dest_hw = ~cpu_to_be64(0);  /* broadcast */
 840         else
 841                 dest_hw = cpu_to_be64((u64)priv->host->csr.guid_hi << 32 |
 842                                       priv->host->csr.guid_lo);
 843
 844         /* If this is an ARP packet, convert it. First, we want to make
 845          * use of some of the fields, since they tell us a little bit
 846          * about the sending machine.  */
 847         if (ether_type == htons(ETH_P_ARP)) {
 848                 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
 849                 struct arphdr *arp = (struct arphdr *)skb->data;
 850                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 851                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 852                                            ntohl(arp1394->fifo_lo);
 853                 u8 max_rec = min(priv->host->csr.max_rec,
 854                                  (u8)(arp1394->max_rec));
 855                 int sspd = arp1394->sspd;
 856                 u16 maxpayload;
 857                 struct eth1394_node_ref *node;
 858                 struct eth1394_node_info *node_info;
 859                 __be64 guid;
 860
 861                 /* Sanity check. MacOSX seems to be sending us 131 in this
 862                  * field (atleast on my Panther G5). Not sure why. */
 863                 if (sspd > 5 || sspd < 0)
 864                         sspd = 0;
 865
 866                 maxpayload = min(eth1394_speedto_maxpayload[sspd],
 867                                  (u16)(1 << (max_rec + 1)));
 868
 869                 guid = get_unaligned(&arp1394->s_uniq_id);
 870                 node = eth1394_find_node_guid(&priv->ip_node_list,
 871                                               be64_to_cpu(guid));
 872                 if (!node)
 873                         return cpu_to_be16(0);
 874
 875                 node_info = dev_get_drvdata(&node->ud->device);
 876
 877                 /* Update our speed/payload/fifo_offset table */
 878                 node_info->maxpayload = maxpayload;
 879                 node_info->sspd =       sspd;
 880                 node_info->fifo =       fifo_addr;
 881
 882                 /* Now that we're done with the 1394 specific stuff, we'll
 883                  * need to alter some of the data.  Believe it or not, all
 884                  * that needs to be done is sender_IP_address needs to be
 885                  * moved, the destination hardware address get stuffed
 886                  * in and the hardware address length set to 8.
 887                  *
 888                  * IMPORTANT: The code below overwrites 1394 specific data
 889                  * needed above so keep the munging of the data for the
 890                  * higher level IP stack last. */
 891
 892                 arp->ar_hln = 8;
 893                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 894                 *(u32 *)arp_ptr = arp1394->sip; /* move sender IP addr */
 895                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 896
 897                 if (arp->ar_op == htons(ARPOP_REQUEST))
 898                         memset(arp_ptr, 0, sizeof(u64));
 899                 else
 900                         memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
 901         }
 902
 903         /* Now add the ethernet header. */
 904         if (dev_hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 905                             skb->len) >= 0)
 906                 ret = ether1394_type_trans(skb, dev);
 907
 908         return ret;
 909 }
 910
 911 static int fragment_overlap(struct list_head *frag_list, int offset, int len)
 912 {
 913         struct fragment_info *fi;
 914         int end = offset + len;
 915
 916         list_for_each_entry(fi, frag_list, list)
 917                 if (offset < fi->offset + fi->len && end > fi->offset)
 918                         return 1;
 919
 920         return 0;
 921 }
 922
 923 static struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 924 {
 925         struct partial_datagram *pd;
 926
 927         list_for_each_entry(pd, pdgl, list)
 928                 if (pd->dgl == dgl)
 929                         return &pd->list;
 930
 931         return NULL;
 932 }
 933
 934 /* Assumes that new fragment does not overlap any existing fragments */
 935 static int new_fragment(struct list_head *frag_info, int offset, int len)
 936 {
 937         struct list_head *lh;
 938         struct fragment_info *fi, *fi2, *new;
 939
 940         list_for_each(lh, frag_info) {
 941                 fi = list_entry(lh, struct fragment_info, list);
 942                 if (fi->offset + fi->len == offset) {
 943                         /* The new fragment can be tacked on to the end */
 944                         fi->len += len;
 945                         /* Did the new fragment plug a hole? */
 946                         fi2 = list_entry(lh->next, struct fragment_info, list);
 947                         if (fi->offset + fi->len == fi2->offset) {
 948                                 /* glue fragments together */
 949                                 fi->len += fi2->len;
 950                                 list_del(lh->next);
 951                                 kfree(fi2);
 952                         }
 953                         return 0;
 954                 } else if (offset + len == fi->offset) {
 955                         /* The new fragment can be tacked on to the beginning */
 956                         fi->offset = offset;
 957                         fi->len += len;
 958                         /* Did the new fragment plug a hole? */
 959                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 960                         if (fi2->offset + fi2->len == fi->offset) {
 961                                 /* glue fragments together */
 962                                 fi2->len += fi->len;
 963                                 list_del(lh);
 964                                 kfree(fi);
 965                         }
 966                         return 0;
 967                 } else if (offset > fi->offset + fi->len) {
 968                         break;
 969                 } else if (offset + len < fi->offset) {
 970                         lh = lh->prev;
 971                         break;
 972                 }
 973         }
 974
 975         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 976         if (!new)
 977                 return -ENOMEM;
 978
 979         new->offset = offset;
 980         new->len = len;
 981
 982         list_add(&new->list, lh);
 983         return 0;
 984 }
 985
 986 static int new_partial_datagram(struct net_device *dev, struct list_head *pdgl,
 987                                 int dgl, int dg_size, char *frag_buf,
 988                                 int frag_off, int frag_len)
 989 {
 990         struct partial_datagram *new;
 991
 992         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 993         if (!new)
 994                 return -ENOMEM;
 995
 996         INIT_LIST_HEAD(&new->frag_info);
 997
 998         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
 999                 kfree(new);
1000                 return -ENOMEM;
1001         }
1002
1003         new->dgl = dgl;
1004         new->dg_size = dg_size;
1005
1006         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1007         if (!new->skb) {
1008                 struct fragment_info *fi = list_entry(new->frag_info.next,
1009                                                       struct fragment_info,
1010                                                       list);
1011                 kfree(fi);
1012                 kfree(new);
1013                 return -ENOMEM;
1014         }
1015
1016         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1017         new->pbuf = skb_put(new->skb, dg_size);
1018         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1019
1020         list_add(&new->list, pdgl);
1021         return 0;
1022 }
1023
1024 static int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1025                                    char *frag_buf, int frag_off, int frag_len)
1026 {
1027         struct partial_datagram *pd =
1028                         list_entry(lh, struct partial_datagram, list);
1029
1030         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0)
1031                 return -ENOMEM;
1032
1033         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1034
1035         /* Move list entry to beginnig of list so that oldest partial
1036          * datagrams percolate to the end of the list */
1037         list_move(lh, pdgl);
1038         return 0;
1039 }
1040
1041 static int is_datagram_complete(struct list_head *lh, int dg_size)
1042 {
1043         struct partial_datagram *pd;
1044         struct fragment_info *fi;
1045
1046         pd = list_entry(lh, struct partial_datagram, list);
1047         fi = list_entry(pd->frag_info.next, struct fragment_info, list);
1048
1049         return (fi->len == dg_size);
1050 }
1051
1052 /* Packet reception. We convert the IP1394 encapsulation header to an
1053  * ethernet header, and fill it with some of our other fields. This is
1054  * an incoming packet from the 1394 bus.  */
1055 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1056                                   char *buf, int len)
1057 {
1058         struct sk_buff *skb;
1059         unsigned long flags;
1060         struct eth1394_priv *priv = netdev_priv(dev);
1061         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1062         __be16 ether_type = cpu_to_be16(0);  /* initialized to clear warning */
1063         int hdr_len;
1064         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1065         struct eth1394_node_info *node_info;
1066
1067         if (!ud) {
1068                 struct eth1394_node_ref *node;
1069                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1070                 if (unlikely(!node)) {
1071                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1072                                    "lookup failure: " NODE_BUS_FMT,
1073                                    NODE_BUS_ARGS(priv->host, srcid));
1074                         dev->stats.rx_dropped++;
1075                         return -1;
1076                 }
1077                 ud = node->ud;
1078
1079                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1080         }
1081
1082         node_info = dev_get_drvdata(&ud->device);
1083
1084         /* First, did we receive a fragmented or unfragmented datagram? */
1085         hdr->words.word1 = ntohs(hdr->words.word1);
1086
1087         hdr_len = hdr_type_len[hdr->common.lf];
1088
1089         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1090                 /* An unfragmented datagram has been received by the ieee1394
1091                  * bus. Build an skbuff around it so we can pass it to the
1092                  * high level network layer. */
1093
1094                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1095                 if (unlikely(!skb)) {
1096                         ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
1097                         dev->stats.rx_dropped++;
1098                         return -1;
1099                 }
1100                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1101                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len,
1102                        len - hdr_len);
1103                 ether_type = hdr->uf.ether_type;
1104         } else {
1105                 /* A datagram fragment has been received, now the fun begins. */
1106
1107                 struct list_head *pdgl, *lh;
1108                 struct partial_datagram *pd;
1109                 int fg_off;
1110                 int fg_len = len - hdr_len;
1111                 int dg_size;
1112                 int dgl;
1113                 int retval;
1114                 struct pdg_list *pdg = &(node_info->pdg);
1115
1116                 hdr->words.word3 = ntohs(hdr->words.word3);
1117                 /* The 4th header word is reserved so no need to do ntohs() */
1118
1119                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1120                         ether_type = hdr->ff.ether_type;
1121                         dgl = hdr->ff.dgl;
1122                         dg_size = hdr->ff.dg_size + 1;
1123                         fg_off = 0;
1124                 } else {
1125                         hdr->words.word2 = ntohs(hdr->words.word2);
1126                         dgl = hdr->sf.dgl;
1127                         dg_size = hdr->sf.dg_size + 1;
1128                         fg_off = hdr->sf.fg_off;
1129                 }
1130                 spin_lock_irqsave(&pdg->lock, flags);
1131
1132                 pdgl = &(pdg->list);
1133                 lh = find_partial_datagram(pdgl, dgl);
1134
1135                 if (lh == NULL) {
1136                         while (pdg->sz >= max_partial_datagrams) {
1137                                 /* remove the oldest */
1138                                 purge_partial_datagram(pdgl->prev);
1139                                 pdg->sz--;
1140                         }
1141
1142                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1143                                                       buf + hdr_len, fg_off,
1144                                                       fg_len);
1145                         if (retval < 0) {
1146                                 spin_unlock_irqrestore(&pdg->lock, flags);
1147                                 goto bad_proto;
1148                         }
1149                         pdg->sz++;
1150                         lh = find_partial_datagram(pdgl, dgl);
1151                 } else {
1152                         pd = list_entry(lh, struct partial_datagram, list);
1153
1154                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1155                                 /* Overlapping fragments, obliterate old
1156                                  * datagram and start new one. */
1157                                 purge_partial_datagram(lh);
1158                                 retval = new_partial_datagram(dev, pdgl, dgl,
1159                                                               dg_size,
1160                                                               buf + hdr_len,
1161                                                               fg_off, fg_len);
1162                                 if (retval < 0) {
1163                                         pdg->sz--;
1164                                         spin_unlock_irqrestore(&pdg->lock, flags);
1165                                         goto bad_proto;
1166                                 }
1167                         } else {
1168                                 retval = update_partial_datagram(pdgl, lh,
1169                                                                  buf + hdr_len,
1170                                                                  fg_off, fg_len);
1171                                 if (retval < 0) {
1172                                         /* Couldn't save off fragment anyway
1173                                          * so might as well obliterate the
1174                                          * datagram now. */
1175                                         purge_partial_datagram(lh);
1176                                         pdg->sz--;
1177                                         spin_unlock_irqrestore(&pdg->lock, flags);
1178                                         goto bad_proto;
1179                                 }
1180                         } /* fragment overlap */
1181                 } /* new datagram or add to existing one */
1182
1183                 pd = list_entry(lh, struct partial_datagram, list);
1184
1185                 if (hdr->common.lf == ETH1394_HDR_LF_FF)
1186                         pd->ether_type = ether_type;
1187
1188                 if (is_datagram_complete(lh, dg_size)) {
1189                         ether_type = pd->ether_type;
1190                         pdg->sz--;
1191                         skb = skb_get(pd->skb);
1192                         purge_partial_datagram(lh);
1193                         spin_unlock_irqrestore(&pdg->lock, flags);
1194                 } else {
1195                         /* Datagram is not complete, we're done for the
1196                          * moment. */
1197                         spin_unlock_irqrestore(&pdg->lock, flags);
1198                         return 0;
1199                 }
1200         } /* unframgented datagram or fragmented one */
1201
1202         /* Write metadata, and then pass to the receive level */
1203         skb->dev = dev;
1204         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1205
1206         /* Parse the encapsulation header. This actually does the job of
1207          * converting to an ethernet frame header, aswell as arp
1208          * conversion if needed. ARP conversion is easier in this
1209          * direction, since we are using ethernet as our backend.  */
1210         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1211                                               ether_type);
1212
1213         spin_lock_irqsave(&priv->lock, flags);
1214
1215         if (!skb->protocol) {
1216                 dev->stats.rx_errors++;
1217                 dev->stats.rx_dropped++;
1218                 dev_kfree_skb_any(skb);
1219         } else if (netif_rx(skb) == NET_RX_DROP) {
1220                 dev->stats.rx_errors++;
1221                 dev->stats.rx_dropped++;
1222         } else {
1223                 dev->stats.rx_packets++;
1224                 dev->stats.rx_bytes += skb->len;
1225         }
1226
1227         spin_unlock_irqrestore(&priv->lock, flags);
1228
1229 bad_proto:
1230         if (netif_queue_stopped(dev))
1231                 netif_wake_queue(dev);
1232
1233         return 0;
1234 }
1235
1236 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1237                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1238 {
1239         struct eth1394_host_info *hi;
1240
1241         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1242         if (unlikely(!hi)) {
1243                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1244                                 host->id);
1245                 return RCODE_ADDRESS_ERROR;
1246         }
1247
1248         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1249                 return RCODE_ADDRESS_ERROR;
1250         else
1251                 return RCODE_COMPLETE;
1252 }
1253
1254 static void ether1394_iso(struct hpsb_iso *iso)
1255 {
1256         __be32 *data;
1257         char *buf;
1258         struct eth1394_host_info *hi;
1259         struct net_device *dev;
1260         struct eth1394_priv *priv;
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                 priv = netdev_priv(dev);
1291
1292                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f)
1293                     || specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1294                         /* This packet is not for us */
1295                         continue;
1296                 }
1297                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1298                                        buf, len);
1299         }
1300
1301         hpsb_iso_recv_release_packets(iso, i);
1302
1303         dev->last_rx = jiffies;
1304 }
1305
1306 /******************************************
1307  * Datagram transmission code
1308  ******************************************/
1309
1310 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1311  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1312  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1313  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1314  * judge.
1315  *
1316  * Now that the EUI is used for the hardware address all we need to do to make
1317  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1318  * speed, and unicast FIFO address information between the sender_unique_id
1319  * and the IP addresses.
1320  */
1321 static void ether1394_arp_to_1394arp(struct sk_buff *skb,
1322                                      struct net_device *dev)
1323 {
1324         struct eth1394_priv *priv = netdev_priv(dev);
1325         struct arphdr *arp = (struct arphdr *)skb->data;
1326         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1327         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1328
1329         arp1394->hw_addr_len    = 16;
1330         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1331         arp1394->max_rec        = priv->host->csr.max_rec;
1332         arp1394->sspd           = priv->host->csr.lnk_spd;
1333         arp1394->fifo_hi        = htons(priv->local_fifo >> 32);
1334         arp1394->fifo_lo        = htonl(priv->local_fifo & ~0x0);
1335 }
1336
1337 /* We need to encapsulate the standard header with our own. We use the
1338  * ethernet header's proto for our own. */
1339 static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1340                                                __be16 proto,
1341                                                union eth1394_hdr *hdr,
1342                                                u16 dg_size, u16 dgl)
1343 {
1344         unsigned int adj_max_payload =
1345                                 max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1346
1347         /* Does it all fit in one packet? */
1348         if (dg_size <= adj_max_payload) {
1349                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1350                 hdr->uf.ether_type = proto;
1351         } else {
1352                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1353                 hdr->ff.ether_type = proto;
1354                 hdr->ff.dg_size = dg_size - 1;
1355                 hdr->ff.dgl = dgl;
1356                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1357         }
1358         return DIV_ROUND_UP(dg_size, adj_max_payload);
1359 }
1360
1361 static unsigned int ether1394_encapsulate(struct sk_buff *skb,
1362                                           unsigned int max_payload,
1363                                           union eth1394_hdr *hdr)
1364 {
1365         union eth1394_hdr *bufhdr;
1366         int ftype = hdr->common.lf;
1367         int hdrsz = hdr_type_len[ftype];
1368         unsigned int adj_max_payload = max_payload - hdrsz;
1369
1370         switch (ftype) {
1371         case ETH1394_HDR_LF_UF:
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                 break;
1376
1377         case ETH1394_HDR_LF_FF:
1378                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1379                 bufhdr->words.word1 = htons(hdr->words.word1);
1380                 bufhdr->words.word2 = hdr->words.word2;
1381                 bufhdr->words.word3 = htons(hdr->words.word3);
1382                 bufhdr->words.word4 = 0;
1383
1384                 /* Set frag type here for future interior fragments */
1385                 hdr->common.lf = ETH1394_HDR_LF_IF;
1386                 hdr->sf.fg_off = 0;
1387                 break;
1388
1389         default:
1390                 hdr->sf.fg_off += adj_max_payload;
1391                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1392                 if (max_payload >= skb->len)
1393                         hdr->common.lf = ETH1394_HDR_LF_LF;
1394                 bufhdr->words.word1 = htons(hdr->words.word1);
1395                 bufhdr->words.word2 = htons(hdr->words.word2);
1396                 bufhdr->words.word3 = htons(hdr->words.word3);
1397                 bufhdr->words.word4 = 0;
1398         }
1399         return min(max_payload, skb->len);
1400 }
1401
1402 static struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1403 {
1404         struct hpsb_packet *p;
1405
1406         p = hpsb_alloc_packet(0);
1407         if (p) {
1408                 p->host = host;
1409                 p->generation = get_hpsb_generation(host);
1410                 p->type = hpsb_async;
1411         }
1412         return p;
1413 }
1414
1415 static int ether1394_prep_write_packet(struct hpsb_packet *p,
1416                                        struct hpsb_host *host, nodeid_t node,
1417                                        u64 addr, void *data, int tx_len)
1418 {
1419         p->node_id = node;
1420
1421         if (hpsb_get_tlabel(p))
1422                 return -EAGAIN;
1423
1424         p->tcode = TCODE_WRITEB;
1425         p->header_size = 16;
1426         p->expect_response = 1;
1427         p->header[0] =
1428                 p->node_id << 16 | p->tlabel << 10 | 1 << 8 | TCODE_WRITEB << 4;
1429         p->header[1] = host->node_id << 16 | addr >> 32;
1430         p->header[2] = addr & 0xffffffff;
1431         p->header[3] = tx_len << 16;
1432         p->data_size = (tx_len + 3) & ~3;
1433         p->data = data;
1434
1435         return 0;
1436 }
1437
1438 static void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1439                                        struct eth1394_priv *priv,
1440                                        struct sk_buff *skb, int length)
1441 {
1442         p->header_size = 4;
1443         p->tcode = TCODE_STREAM_DATA;
1444
1445         p->header[0] = length << 16 | 3 << 14 | priv->broadcast_channel << 8 |
1446                        TCODE_STREAM_DATA << 4;
1447         p->data_size = length;
1448         p->data = (quadlet_t *)skb->data - 2;
1449         p->data[0] = cpu_to_be32(priv->host->node_id << 16 |
1450                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1451         p->data[1] = cpu_to_be32(ETHER1394_GASP_SPECIFIER_ID_LO << 24 |
1452                                  ETHER1394_GASP_VERSION);
1453
1454         p->speed_code = priv->bc_sspd;
1455
1456         /* prevent hpsb_send_packet() from overriding our speed code */
1457         p->node_id = LOCAL_BUS | ALL_NODES;
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 -ENOMEM;
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 -EAGAIN;
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 -EIO;
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 net_device *dev = skb->dev;
1507         struct eth1394_priv *priv = netdev_priv(dev);
1508         unsigned long flags;
1509
1510         /* Statistics */
1511         spin_lock_irqsave(&priv->lock, flags);
1512         if (fail) {
1513                 dev->stats.tx_dropped++;
1514                 dev->stats.tx_errors++;
1515         } else {
1516                 dev->stats.tx_bytes += skb->len;
1517                 dev->stats.tx_packets++;
1518         }
1519         spin_unlock_irqrestore(&priv->lock, flags);
1520
1521         dev_kfree_skb_any(skb);
1522         kmem_cache_free(packet_task_cache, ptask);
1523 }
1524
1525 /* Callback for when a packet has been sent and the status of that packet is
1526  * known */
1527 static void ether1394_complete_cb(void *__ptask)
1528 {
1529         struct packet_task *ptask = (struct packet_task *)__ptask;
1530         struct hpsb_packet *packet = ptask->packet;
1531         int fail = 0;
1532
1533         if (packet->tcode != TCODE_STREAM_DATA)
1534                 fail = hpsb_packet_success(packet);
1535
1536         ether1394_free_packet(packet);
1537
1538         ptask->outstanding_pkts--;
1539         if (ptask->outstanding_pkts > 0 && !fail) {
1540                 int tx_len, err;
1541
1542                 /* Add the encapsulation header to the fragment */
1543                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1544                                                &ptask->hdr);
1545                 err = ether1394_send_packet(ptask, tx_len);
1546                 if (err) {
1547                         if (err == -EAGAIN)
1548                                 ETH1394_PRINT_G(KERN_ERR, "Out of tlabels\n");
1549
1550                         ether1394_dg_complete(ptask, 1);
1551                 }
1552         } else {
1553                 ether1394_dg_complete(ptask, fail);
1554         }
1555 }
1556
1557 /* Transmit a packet (called by kernel) */
1558 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
1559 {
1560         struct eth1394hdr hdr_buf;
1561         struct eth1394_priv *priv = netdev_priv(dev);
1562         __be16 proto;
1563         unsigned long flags;
1564         nodeid_t dest_node;
1565         eth1394_tx_type tx_type;
1566         unsigned int tx_len;
1567         unsigned int max_payload;
1568         u16 dg_size;
1569         u16 dgl;
1570         struct packet_task *ptask;
1571         struct eth1394_node_ref *node;
1572         struct eth1394_node_info *node_info = NULL;
1573
1574         ptask = kmem_cache_alloc(packet_task_cache, GFP_ATOMIC);
1575         if (ptask == NULL)
1576                 goto fail;
1577
1578         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1579          * it does not set our validity bit. We need to compensate for
1580          * that somewhere else, but not in eth1394. */
1581 #if 0
1582         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000)
1583                 goto fail;
1584 #endif
1585
1586         skb = skb_share_check(skb, GFP_ATOMIC);
1587         if (!skb)
1588                 goto fail;
1589
1590         /* Get rid of the fake eth1394 header, but first make a copy.
1591          * We might need to rebuild the header on tx failure. */
1592         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1593         skb_pull(skb, ETH1394_HLEN);
1594
1595         proto = hdr_buf.h_proto;
1596         dg_size = skb->len;
1597
1598         /* Set the transmission type for the packet.  ARP packets and IP
1599          * broadcast packets are sent via GASP. */
1600         if (memcmp(hdr_buf.h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1601             proto == htons(ETH_P_ARP) ||
1602             (proto == htons(ETH_P_IP) &&
1603              IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1604                 tx_type = ETH1394_GASP;
1605                 dest_node = LOCAL_BUS | ALL_NODES;
1606                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1607                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1608                 dgl = priv->bc_dgl;
1609                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1610                         priv->bc_dgl++;
1611         } else {
1612                 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1613
1614                 node = eth1394_find_node_guid(&priv->ip_node_list,
1615                                               be64_to_cpu(guid));
1616                 if (!node)
1617                         goto fail;
1618
1619                 node_info = dev_get_drvdata(&node->ud->device);
1620                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE)
1621                         goto fail;
1622
1623                 dest_node = node->ud->ne->nodeid;
1624                 max_payload = node_info->maxpayload;
1625                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1626
1627                 dgl = node_info->dgl;
1628                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1629                         node_info->dgl++;
1630                 tx_type = ETH1394_WRREQ;
1631         }
1632
1633         /* If this is an ARP packet, convert it */
1634         if (proto == htons(ETH_P_ARP))
1635                 ether1394_arp_to_1394arp(skb, dev);
1636
1637         ptask->hdr.words.word1 = 0;
1638         ptask->hdr.words.word2 = 0;
1639         ptask->hdr.words.word3 = 0;
1640         ptask->hdr.words.word4 = 0;
1641         ptask->skb = skb;
1642         ptask->priv = priv;
1643         ptask->tx_type = tx_type;
1644
1645         if (tx_type != ETH1394_GASP) {
1646                 u64 addr;
1647
1648                 spin_lock_irqsave(&priv->lock, flags);
1649                 addr = node_info->fifo;
1650                 spin_unlock_irqrestore(&priv->lock, flags);
1651
1652                 ptask->addr = addr;
1653                 ptask->dest_node = dest_node;
1654         }
1655
1656         ptask->tx_type = tx_type;
1657         ptask->max_payload = max_payload;
1658         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload,
1659                                         proto, &ptask->hdr, dg_size, dgl);
1660
1661         /* Add the encapsulation header to the fragment */
1662         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1663         dev->trans_start = jiffies;
1664         if (ether1394_send_packet(ptask, tx_len)) {
1665                 if (dest_node == (LOCAL_BUS | ALL_NODES))
1666                         goto fail;
1667
1668                 /* At this point we want to restore the packet.  When we return
1669                  * here with NETDEV_TX_BUSY we will get another entrance in this
1670                  * routine with the same skb and we need it to look the same.
1671                  * So we pull 4 more bytes, then build the header again. */
1672                 skb_pull(skb, 4);
1673                 ether1394_header(skb, dev, ntohs(hdr_buf.h_proto),
1674                                  hdr_buf.h_dest, NULL, 0);
1675
1676                 /* Most failures of ether1394_send_packet are recoverable. */
1677                 netif_stop_queue(dev);
1678                 priv->wake_node = dest_node;
1679                 schedule_work(&priv->wake);
1680                 kmem_cache_free(packet_task_cache, ptask);
1681                 return NETDEV_TX_BUSY;
1682         }
1683
1684         return NETDEV_TX_OK;
1685 fail:
1686         if (ptask)
1687                 kmem_cache_free(packet_task_cache, ptask);
1688
1689         if (skb != NULL)
1690                 dev_kfree_skb(skb);
1691
1692         spin_lock_irqsave(&priv->lock, flags);
1693         dev->stats.tx_dropped++;
1694         dev->stats.tx_errors++;
1695         spin_unlock_irqrestore(&priv->lock, flags);
1696
1697         /*
1698          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1699          * causes serious problems" here, allegedly.  Before that patch,
1700          * -ERRNO was returned which is not appropriate under Linux 2.6.
1701          * Perhaps more needs to be done?  Stop the queue in serious
1702          * conditions and restart it elsewhere?
1703          */
1704         /* return NETDEV_TX_BUSY; */
1705         return NETDEV_TX_OK;
1706 }
1707
1708 static void ether1394_get_drvinfo(struct net_device *dev,
1709                                   struct ethtool_drvinfo *info)
1710 {
1711         strcpy(info->driver, driver_name);
1712         strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */
1713 }
1714
1715 static struct ethtool_ops ethtool_ops = {
1716         .get_drvinfo = ether1394_get_drvinfo
1717 };
1718
1719 static int __init ether1394_init_module(void)
1720 {
1721         int err;
1722
1723         packet_task_cache = kmem_cache_create("packet_task",
1724                                               sizeof(struct packet_task),
1725                                               0, 0, NULL);
1726         if (!packet_task_cache)
1727                 return -ENOMEM;
1728
1729         hpsb_register_highlevel(&eth1394_highlevel);
1730         err = hpsb_register_protocol(&eth1394_proto_driver);
1731         if (err) {
1732                 hpsb_unregister_highlevel(&eth1394_highlevel);
1733                 kmem_cache_destroy(packet_task_cache);
1734         }
1735         return err;
1736 }
1737
1738 static void __exit ether1394_exit_module(void)
1739 {
1740         hpsb_unregister_protocol(&eth1394_proto_driver);
1741         hpsb_unregister_highlevel(&eth1394_highlevel);
1742         kmem_cache_destroy(packet_task_cache);
1743 }
1744
1745 module_init(ether1394_init_module);
1746 module_exit(ether1394_exit_module);