drivers/ieee1394/eth1394.c

   1 /*
   2  * eth1394.c -- Ethernet 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 /* This driver intends to support RFC 2734, which describes a method for
  26  * transporting IPv4 datagrams over IEEE-1394 serial busses. This driver
  27  * will ultimately support that method, but currently falls short in
  28  * several areas.
  29  *
  30  * TODO:
  31  * RFC 2734 related:
  32  * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
  33  *
  34  * Non-RFC 2734 related:
  35  * - Handle fragmented skb's coming from the networking layer.
  36  * - Move generic GASP reception to core 1394 code
  37  * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
  38  * - Stability improvements
  39  * - Performance enhancements
  40  * - Consider garbage collecting old partial datagrams after X amount of time
  41  */
  42
  43
  44 #include <linux/module.h>
  45
  46 #include <linux/sched.h>
  47 #include <linux/kernel.h>
  48 #include <linux/slab.h>
  49 #include <linux/errno.h>
  50 #include <linux/types.h>
  51 #include <linux/delay.h>
  52 #include <linux/init.h>
  53
  54 #include <linux/netdevice.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/etherdevice.h>
  57 #include <linux/if_arp.h>
  58 #include <linux/if_ether.h>
  59 #include <linux/ip.h>
  60 #include <linux/in.h>
  61 #include <linux/tcp.h>
  62 #include <linux/skbuff.h>
  63 #include <linux/bitops.h>
  64 #include <linux/ethtool.h>
  65 #include <asm/uaccess.h>
  66 #include <asm/delay.h>
  67 #include <net/arp.h>
  68
  69 #include "config_roms.h"
  70 #include "csr1212.h"
  71 #include "eth1394.h"
  72 #include "highlevel.h"
  73 #include "ieee1394.h"
  74 #include "ieee1394_core.h"
  75 #include "ieee1394_hotplug.h"
  76 #include "ieee1394_transactions.h"
  77 #include "ieee1394_types.h"
  78 #include "iso.h"
  79 #include "nodemgr.h"
  80
  81 #define ETH1394_PRINT_G(level, fmt, args...) \
  82         printk(level "%s: " fmt, driver_name, ## args)
  83
  84 #define ETH1394_PRINT(level, dev_name, fmt, args...) \
  85         printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
  86
  87 #define DEBUG(fmt, args...) \
  88         printk(KERN_ERR "%s:%s[%d]: " fmt "\n", driver_name, __FUNCTION__, __LINE__, ## args)
  89 #define TRACE() printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)
  90
  91 struct fragment_info {
  92         struct list_head list;
  93         int offset;
  94         int len;
  95 };
  96
  97 struct partial_datagram {
  98         struct list_head list;
  99         u16 dgl;
 100         u16 dg_size;
 101         u16 ether_type;
 102         struct sk_buff *skb;
 103         char *pbuf;
 104         struct list_head frag_info;
 105 };
 106
 107 struct pdg_list {
 108         struct list_head list;          /* partial datagram list per node       */
 109         unsigned int sz;                /* partial datagram list size per node  */
 110         spinlock_t lock;                /* partial datagram lock                */
 111 };
 112
 113 struct eth1394_host_info {
 114         struct hpsb_host *host;
 115         struct net_device *dev;
 116 };
 117
 118 struct eth1394_node_ref {
 119         struct unit_directory *ud;
 120         struct list_head list;
 121 };
 122
 123 struct eth1394_node_info {
 124         u16 maxpayload;                 /* Max payload                  */
 125         u8 sspd;                        /* Max speed                    */
 126         u64 fifo;                       /* FIFO address                 */
 127         struct pdg_list pdg;            /* partial RX datagram lists    */
 128         int dgl;                        /* Outgoing datagram label      */
 129 };
 130
 131 /* Our ieee1394 highlevel driver */
 132 #define ETH1394_DRIVER_NAME "eth1394"
 133 static const char driver_name[] = ETH1394_DRIVER_NAME;
 134
 135 static kmem_cache_t *packet_task_cache;
 136
 137 static struct hpsb_highlevel eth1394_highlevel;
 138
 139 /* Use common.lf to determine header len */
 140 static const int hdr_type_len[] = {
 141         sizeof (struct eth1394_uf_hdr),
 142         sizeof (struct eth1394_ff_hdr),
 143         sizeof (struct eth1394_sf_hdr),
 144         sizeof (struct eth1394_sf_hdr)
 145 };
 146
 147 /* Change this to IEEE1394_SPEED_S100 to make testing easier */
 148 #define ETH1394_SPEED_DEF       IEEE1394_SPEED_MAX
 149
 150 /* For now, this needs to be 1500, so that XP works with us */
 151 #define ETH1394_DATA_LEN        ETH_DATA_LEN
 152
 153 static const u16 eth1394_speedto_maxpayload[] = {
 154 /*     S100, S200, S400, S800, S1600, S3200 */
 155         512, 1024, 2048, 4096,  4096,  4096
 156 };
 157
 158 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
 159 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
 160 MODULE_LICENSE("GPL");
 161
 162 /* The max_partial_datagrams parameter is the maximum number of fragmented
 163  * datagrams per node that eth1394 will keep in memory.  Providing an upper
 164  * bound allows us to limit the amount of memory that partial datagrams
 165  * consume in the event that some partial datagrams are never completed.
 166  */
 167 static int max_partial_datagrams = 25;
 168 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
 169 MODULE_PARM_DESC(max_partial_datagrams,
 170                  "Maximum number of partially received fragmented datagrams "
 171                  "(default = 25).");
 172
 173
 174 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 175                             unsigned short type, void *daddr, void *saddr,
 176                             unsigned len);
 177 static int ether1394_rebuild_header(struct sk_buff *skb);
 178 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
 179 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 180 static void ether1394_header_cache_update(struct hh_cache *hh,
 181                                           struct net_device *dev,
 182                                           unsigned char * haddr);
 183 static int ether1394_mac_addr(struct net_device *dev, void *p);
 184
 185 static void purge_partial_datagram(struct list_head *old);
 186 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 187 static void ether1394_iso(struct hpsb_iso *iso);
 188
 189 static struct ethtool_ops ethtool_ops;
 190
 191 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 192                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 193 static void ether1394_add_host (struct hpsb_host *host);
 194 static void ether1394_remove_host (struct hpsb_host *host);
 195 static void ether1394_host_reset (struct hpsb_host *host);
 196
 197 /* Function for incoming 1394 packets */
 198 static struct hpsb_address_ops addr_ops = {
 199         .write =        ether1394_write,
 200 };
 201
 202 /* Ieee1394 highlevel driver functions */
 203 static struct hpsb_highlevel eth1394_highlevel = {
 204         .name =         driver_name,
 205         .add_host =     ether1394_add_host,
 206         .remove_host =  ether1394_remove_host,
 207         .host_reset =   ether1394_host_reset,
 208 };
 209
 210
 211 /* This is called after an "ifup" */
 212 static int ether1394_open (struct net_device *dev)
 213 {
 214         struct eth1394_priv *priv = netdev_priv(dev);
 215         int ret = 0;
 216
 217         /* Something bad happened, don't even try */
 218         if (priv->bc_state == ETHER1394_BC_ERROR) {
 219                 /* we'll try again */
 220                 priv->iso = hpsb_iso_recv_init(priv->host,
 221                                                ETHER1394_ISO_BUF_SIZE,
 222                                                ETHER1394_GASP_BUFFERS,
 223                                                priv->broadcast_channel,
 224                                                HPSB_ISO_DMA_PACKET_PER_BUFFER,
 225                                                1, ether1394_iso);
 226                 if (priv->iso == NULL) {
 227                         ETH1394_PRINT(KERN_ERR, dev->name,
 228                                       "Could not allocate isochronous receive "
 229                                       "context for the broadcast channel\n");
 230                         priv->bc_state = ETHER1394_BC_ERROR;
 231                         ret = -EAGAIN;
 232                 } else {
 233                         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 234                                 priv->bc_state = ETHER1394_BC_STOPPED;
 235                         else
 236                                 priv->bc_state = ETHER1394_BC_RUNNING;
 237                 }
 238         }
 239
 240         if (ret)
 241                 return ret;
 242
 243         netif_start_queue (dev);
 244         return 0;
 245 }
 246
 247 /* This is called after an "ifdown" */
 248 static int ether1394_stop (struct net_device *dev)
 249 {
 250         netif_stop_queue (dev);
 251         return 0;
 252 }
 253
 254 /* Return statistics to the caller */
 255 static struct net_device_stats *ether1394_stats (struct net_device *dev)
 256 {
 257         return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
 258 }
 259
 260 /* What to do if we timeout. I think a host reset is probably in order, so
 261  * that's what we do. Should we increment the stat counters too?  */
 262 static void ether1394_tx_timeout (struct net_device *dev)
 263 {
 264         ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
 265                        ((struct eth1394_priv *)netdev_priv(dev))->host->driver->name);
 266
 267         highlevel_host_reset (((struct eth1394_priv *)netdev_priv(dev))->host);
 268
 269         netif_wake_queue (dev);
 270 }
 271
 272 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 273 {
 274         struct eth1394_priv *priv = netdev_priv(dev);
 275
 276         if ((new_mtu < 68) ||
 277             (new_mtu > min(ETH1394_DATA_LEN,
 278                            (int)((1 << (priv->host->csr.max_rec + 1)) -
 279                                  (sizeof(union eth1394_hdr) +
 280                                   ETHER1394_GASP_OVERHEAD)))))
 281                 return -EINVAL;
 282         dev->mtu = new_mtu;
 283         return 0;
 284 }
 285
 286 static void purge_partial_datagram(struct list_head *old)
 287 {
 288         struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
 289         struct list_head *lh, *n;
 290
 291         list_for_each_safe(lh, n, &pd->frag_info) {
 292                 struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
 293                 list_del(lh);
 294                 kfree(fi);
 295         }
 296         list_del(old);
 297         kfree_skb(pd->skb);
 298         kfree(pd);
 299 }
 300
 301 /******************************************
 302  * 1394 bus activity functions
 303  ******************************************/
 304
 305 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 306                                                   struct unit_directory *ud)
 307 {
 308         struct eth1394_node_ref *node;
 309
 310         list_for_each_entry(node, inl, list)
 311                 if (node->ud == ud)
 312                         return node;
 313
 314         return NULL;
 315 }
 316
 317 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 318                                                        u64 guid)
 319 {
 320         struct eth1394_node_ref *node;
 321
 322         list_for_each_entry(node, inl, list)
 323                 if (node->ud->ne->guid == guid)
 324                         return node;
 325
 326         return NULL;
 327 }
 328
 329 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 330                                                          nodeid_t nodeid)
 331 {
 332         struct eth1394_node_ref *node;
 333         list_for_each_entry(node, inl, list) {
 334                 if (node->ud->ne->nodeid == nodeid)
 335                         return node;
 336         }
 337
 338         return NULL;
 339 }
 340
 341 static int eth1394_probe(struct device *dev)
 342 {
 343         struct unit_directory *ud;
 344         struct eth1394_host_info *hi;
 345         struct eth1394_priv *priv;
 346         struct eth1394_node_ref *new_node;
 347         struct eth1394_node_info *node_info;
 348
 349         ud = container_of(dev, struct unit_directory, device);
 350
 351         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 352         if (!hi)
 353                 return -ENOENT;
 354
 355         new_node = kmalloc(sizeof(*new_node),
 356                            in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 357         if (!new_node)
 358                 return -ENOMEM;
 359
 360         node_info = kmalloc(sizeof(*node_info),
 361                             in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 362         if (!node_info) {
 363                 kfree(new_node);
 364                 return -ENOMEM;
 365         }
 366
 367         spin_lock_init(&node_info->pdg.lock);
 368         INIT_LIST_HEAD(&node_info->pdg.list);
 369         node_info->pdg.sz = 0;
 370         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 371
 372         ud->device.driver_data = node_info;
 373         new_node->ud = ud;
 374
 375         priv = netdev_priv(hi->dev);
 376         list_add_tail(&new_node->list, &priv->ip_node_list);
 377
 378         return 0;
 379 }
 380
 381 static int eth1394_remove(struct device *dev)
 382 {
 383         struct unit_directory *ud;
 384         struct eth1394_host_info *hi;
 385         struct eth1394_priv *priv;
 386         struct eth1394_node_ref *old_node;
 387         struct eth1394_node_info *node_info;
 388         struct list_head *lh, *n;
 389         unsigned long flags;
 390
 391         ud = container_of(dev, struct unit_directory, device);
 392         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 393         if (!hi)
 394                 return -ENOENT;
 395
 396         priv = netdev_priv(hi->dev);
 397
 398         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 399
 400         if (old_node) {
 401                 list_del(&old_node->list);
 402                 kfree(old_node);
 403
 404                 node_info = (struct eth1394_node_info*)ud->device.driver_data;
 405
 406                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 407                 /* The partial datagram list should be empty, but we'll just
 408                  * make sure anyway... */
 409                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 410                         purge_partial_datagram(lh);
 411                 }
 412                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 413
 414                 kfree(node_info);
 415                 ud->device.driver_data = NULL;
 416         }
 417         return 0;
 418 }
 419
 420 static int eth1394_update(struct unit_directory *ud)
 421 {
 422         struct eth1394_host_info *hi;
 423         struct eth1394_priv *priv;
 424         struct eth1394_node_ref *node;
 425         struct eth1394_node_info *node_info;
 426
 427         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 428         if (!hi)
 429                 return -ENOENT;
 430
 431         priv = netdev_priv(hi->dev);
 432
 433         node = eth1394_find_node(&priv->ip_node_list, ud);
 434
 435         if (!node) {
 436                 node = kmalloc(sizeof(*node),
 437                                in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 438                 if (!node)
 439                         return -ENOMEM;
 440
 441                 node_info = kmalloc(sizeof(*node_info),
 442                                     in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 443                 if (!node_info) {
 444                         kfree(node);
 445                         return -ENOMEM;
 446                 }
 447
 448                 spin_lock_init(&node_info->pdg.lock);
 449                 INIT_LIST_HEAD(&node_info->pdg.list);
 450                 node_info->pdg.sz = 0;
 451
 452                 ud->device.driver_data = node_info;
 453                 node->ud = ud;
 454
 455                 priv = netdev_priv(hi->dev);
 456                 list_add_tail(&node->list, &priv->ip_node_list);
 457         }
 458
 459         return 0;
 460 }
 461
 462
 463 static struct ieee1394_device_id eth1394_id_table[] = {
 464         {
 465                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 466                                 IEEE1394_MATCH_VERSION),
 467                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 468                 .version = ETHER1394_GASP_VERSION,
 469         },
 470         {}
 471 };
 472
 473 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 474
 475 static struct hpsb_protocol_driver eth1394_proto_driver = {
 476         .name           = "IPv4 over 1394 Driver",
 477         .id_table       = eth1394_id_table,
 478         .update         = eth1394_update,
 479         .driver         = {
 480                 .name           = ETH1394_DRIVER_NAME,
 481                 .bus            = &ieee1394_bus_type,
 482                 .probe          = eth1394_probe,
 483                 .remove         = eth1394_remove,
 484         },
 485 };
 486
 487
 488 static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
 489 {
 490         unsigned long flags;
 491         int i;
 492         struct eth1394_priv *priv = netdev_priv(dev);
 493         struct hpsb_host *host = priv->host;
 494         u64 guid = *((u64*)&(host->csr.rom->bus_info_data[3]));
 495         u16 maxpayload = 1 << (host->csr.max_rec + 1);
 496         int max_speed = IEEE1394_SPEED_MAX;
 497
 498         spin_lock_irqsave (&priv->lock, flags);
 499
 500         memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
 501         priv->bc_maxpayload = 512;
 502
 503         /* Determine speed limit */
 504         for (i = 0; i < host->node_count; i++)
 505                 if (max_speed > host->speed[i])
 506                         max_speed = host->speed[i];
 507         priv->bc_sspd = max_speed;
 508
 509         /* We'll use our maxpayload as the default mtu */
 510         if (set_mtu) {
 511                 dev->mtu = min(ETH1394_DATA_LEN,
 512                                (int)(maxpayload -
 513                                      (sizeof(union eth1394_hdr) +
 514                                       ETHER1394_GASP_OVERHEAD)));
 515
 516                 /* Set our hardware address while we're at it */
 517                 *(u64*)dev->dev_addr = guid;
 518                 *(u64*)dev->broadcast = ~0x0ULL;
 519         }
 520
 521         spin_unlock_irqrestore (&priv->lock, flags);
 522 }
 523
 524 /* This function is called right before register_netdev */
 525 static void ether1394_init_dev (struct net_device *dev)
 526 {
 527         /* Our functions */
 528         dev->open               = ether1394_open;
 529         dev->stop               = ether1394_stop;
 530         dev->hard_start_xmit    = ether1394_tx;
 531         dev->get_stats          = ether1394_stats;
 532         dev->tx_timeout         = ether1394_tx_timeout;
 533         dev->change_mtu         = ether1394_change_mtu;
 534
 535         dev->hard_header        = ether1394_header;
 536         dev->rebuild_header     = ether1394_rebuild_header;
 537         dev->hard_header_cache  = ether1394_header_cache;
 538         dev->header_cache_update= ether1394_header_cache_update;
 539         dev->hard_header_parse  = ether1394_header_parse;
 540         dev->set_mac_address    = ether1394_mac_addr;
 541         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 542
 543         /* Some constants */
 544         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 545         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 546         dev->features           = NETIF_F_HIGHDMA;
 547         dev->addr_len           = ETH1394_ALEN;
 548         dev->hard_header_len    = ETH1394_HLEN;
 549         dev->type               = ARPHRD_IEEE1394;
 550
 551         ether1394_reset_priv (dev, 1);
 552 }
 553
 554 /*
 555  * This function is called every time a card is found. It is generally called
 556  * when the module is installed. This is where we add all of our ethernet
 557  * devices. One for each host.
 558  */
 559 static void ether1394_add_host (struct hpsb_host *host)
 560 {
 561         struct eth1394_host_info *hi = NULL;
 562         struct net_device *dev = NULL;
 563         struct eth1394_priv *priv;
 564         u64 fifo_addr;
 565
 566         if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
 567                 return;
 568
 569         fifo_addr = hpsb_allocate_and_register_addrspace(
 570                         &eth1394_highlevel, host, &addr_ops,
 571                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 572                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 573         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE)
 574                 goto out;
 575
 576         /* We should really have our own alloc_hpsbdev() function in
 577          * net_init.c instead of calling the one for ethernet then hijacking
 578          * it for ourselves.  That way we'd be a real networking device. */
 579         dev = alloc_etherdev(sizeof (struct eth1394_priv));
 580
 581         if (dev == NULL) {
 582                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
 583                                  "etherdevice for IEEE 1394 device %s-%d\n",
 584                                  host->driver->name, host->id);
 585                 goto out;
 586         }
 587
 588         SET_MODULE_OWNER(dev);
 589         SET_NETDEV_DEV(dev, &host->device);
 590
 591         priv = netdev_priv(dev);
 592
 593         INIT_LIST_HEAD(&priv->ip_node_list);
 594
 595         spin_lock_init(&priv->lock);
 596         priv->host = host;
 597         priv->local_fifo = fifo_addr;
 598
 599         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 600
 601         if (hi == NULL) {
 602                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
 603                                  "hostinfo for IEEE 1394 device %s-%d\n",
 604                                  host->driver->name, host->id);
 605                 goto out;
 606         }
 607
 608         ether1394_init_dev(dev);
 609
 610         if (register_netdev (dev)) {
 611                 ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
 612                 goto out;
 613         }
 614
 615         ETH1394_PRINT (KERN_INFO, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet (fw-host%d)\n",
 616                        host->id);
 617
 618         hi->host = host;
 619         hi->dev = dev;
 620
 621         /* Ignore validity in hopes that it will be set in the future.  It'll
 622          * be checked when the eth device is opened. */
 623         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 624
 625         priv->iso = hpsb_iso_recv_init(host,
 626                                        ETHER1394_ISO_BUF_SIZE,
 627                                        ETHER1394_GASP_BUFFERS,
 628                                        priv->broadcast_channel,
 629                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 630                                        1, ether1394_iso);
 631         if (priv->iso == NULL) {
 632                 ETH1394_PRINT(KERN_ERR, dev->name,
 633                               "Could not allocate isochronous receive context "
 634                               "for the broadcast channel\n");
 635                 priv->bc_state = ETHER1394_BC_ERROR;
 636         } else {
 637                 if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 638                         priv->bc_state = ETHER1394_BC_STOPPED;
 639                 else
 640                         priv->bc_state = ETHER1394_BC_RUNNING;
 641         }
 642
 643         return;
 644
 645 out:
 646         if (dev != NULL)
 647                 free_netdev(dev);
 648         if (hi)
 649                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 650
 651         return;
 652 }
 653
 654 /* Remove a card from our list */
 655 static void ether1394_remove_host (struct hpsb_host *host)
 656 {
 657         struct eth1394_host_info *hi;
 658
 659         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 660         if (hi != NULL) {
 661                 struct eth1394_priv *priv = netdev_priv(hi->dev);
 662
 663                 hpsb_unregister_addrspace(&eth1394_highlevel, host,
 664                                           priv->local_fifo);
 665
 666                 if (priv->iso != NULL)
 667                         hpsb_iso_shutdown(priv->iso);
 668
 669                 if (hi->dev) {
 670                         unregister_netdev (hi->dev);
 671                         free_netdev(hi->dev);
 672                 }
 673         }
 674
 675         return;
 676 }
 677
 678 /* A reset has just arisen */
 679 static void ether1394_host_reset (struct hpsb_host *host)
 680 {
 681         struct eth1394_host_info *hi;
 682         struct eth1394_priv *priv;
 683         struct net_device *dev;
 684         struct list_head *lh, *n;
 685         struct eth1394_node_ref *node;
 686         struct eth1394_node_info *node_info;
 687         unsigned long flags;
 688
 689         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 690
 691         /* This can happen for hosts that we don't use */
 692         if (hi == NULL)
 693                 return;
 694
 695         dev = hi->dev;
 696         priv = (struct eth1394_priv *)netdev_priv(dev);
 697
 698         /* Reset our private host data, but not our mtu */
 699         netif_stop_queue (dev);
 700         ether1394_reset_priv (dev, 0);
 701
 702         list_for_each_entry(node, &priv->ip_node_list, list) {
 703                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 704
 705                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 706
 707                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 708                         purge_partial_datagram(lh);
 709                 }
 710
 711                 INIT_LIST_HEAD(&(node_info->pdg.list));
 712                 node_info->pdg.sz = 0;
 713
 714                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 715         }
 716
 717         netif_wake_queue (dev);
 718 }
 719
 720 /******************************************
 721  * HW Header net device functions
 722  ******************************************/
 723 /* These functions have been adapted from net/ethernet/eth.c */
 724
 725
 726 /* Create a fake MAC header for an arbitrary protocol layer.
 727  * saddr=NULL means use device source address
 728  * daddr=NULL means leave destination address (eg unresolved arp). */
 729 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 730                             unsigned short type, void *daddr, void *saddr,
 731                             unsigned len)
 732 {
 733         struct eth1394hdr *eth = (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 734
 735         eth->h_proto = htons(type);
 736
 737         if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) {
 738                 memset(eth->h_dest, 0, dev->addr_len);
 739                 return(dev->hard_header_len);
 740         }
 741
 742         if (daddr) {
 743                 memcpy(eth->h_dest,daddr,dev->addr_len);
 744                 return dev->hard_header_len;
 745         }
 746
 747         return -dev->hard_header_len;
 748
 749 }
 750
 751
 752 /* Rebuild the faked MAC header. This is called after an ARP
 753  * (or in future other address resolution) has completed on this
 754  * sk_buff. We now let ARP fill in the other fields.
 755  *
 756  * This routine CANNOT use cached dst->neigh!
 757  * Really, it is used only when dst->neigh is wrong.
 758  */
 759 static int ether1394_rebuild_header(struct sk_buff *skb)
 760 {
 761         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 762         struct net_device *dev = skb->dev;
 763
 764         switch (eth->h_proto) {
 765
 766 #ifdef CONFIG_INET
 767         case __constant_htons(ETH_P_IP):
 768                 return arp_find((unsigned char*)&eth->h_dest, skb);
 769 #endif
 770         default:
 771                 ETH1394_PRINT(KERN_DEBUG, dev->name,
 772                               "unable to resolve type %04x addresses.\n",
 773                               ntohs(eth->h_proto));
 774                 break;
 775         }
 776
 777         return 0;
 778 }
 779
 780 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
 781 {
 782         struct net_device *dev = skb->dev;
 783         memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
 784         return ETH1394_ALEN;
 785 }
 786
 787
 788 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 789 {
 790         unsigned short type = hh->hh_type;
 791         struct eth1394hdr *eth = (struct eth1394hdr*)(((u8*)hh->hh_data) +
 792                                                       (16 - ETH1394_HLEN));
 793         struct net_device *dev = neigh->dev;
 794
 795         if (type == htons(ETH_P_802_3))
 796                 return -1;
 797
 798         eth->h_proto = type;
 799         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 800
 801         hh->hh_len = ETH1394_HLEN;
 802         return 0;
 803 }
 804
 805 /* Called by Address Resolution module to notify changes in address. */
 806 static void ether1394_header_cache_update(struct hh_cache *hh,
 807                                           struct net_device *dev,
 808                                           unsigned char * haddr)
 809 {
 810         memcpy(((u8*)hh->hh_data) + (16 - ETH1394_HLEN), haddr, dev->addr_len);
 811 }
 812
 813 static int ether1394_mac_addr(struct net_device *dev, void *p)
 814 {
 815         if (netif_running(dev))
 816                 return -EBUSY;
 817
 818         /* Not going to allow setting the MAC address, we really need to use
 819          * the real one supplied by the hardware */
 820          return -EINVAL;
 821  }
 822
 823
 824
 825 /******************************************
 826  * Datagram reception code
 827  ******************************************/
 828
 829 /* Copied from net/ethernet/eth.c */
 830 static inline u16 ether1394_type_trans(struct sk_buff *skb,
 831                                        struct net_device *dev)
 832 {
 833         struct eth1394hdr *eth;
 834         unsigned char *rawp;
 835
 836         skb->mac.raw = skb->data;
 837         skb_pull (skb, ETH1394_HLEN);
 838         eth = eth1394_hdr(skb);
 839
 840         if (*eth->h_dest & 1) {
 841                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
 842                         skb->pkt_type = PACKET_BROADCAST;
 843 #if 0
 844                 else
 845                         skb->pkt_type = PACKET_MULTICAST;
 846 #endif
 847         } else {
 848                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 849                         skb->pkt_type = PACKET_OTHERHOST;
 850         }
 851
 852         if (ntohs (eth->h_proto) >= 1536)
 853                 return eth->h_proto;
 854
 855         rawp = skb->data;
 856
 857         if (*(unsigned short *)rawp == 0xFFFF)
 858                 return htons (ETH_P_802_3);
 859
 860         return htons (ETH_P_802_2);
 861 }
 862
 863 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 864  * We also perform ARP translation here, if need be.  */
 865 static inline u16 ether1394_parse_encap(struct sk_buff *skb,
 866                                         struct net_device *dev,
 867                                         nodeid_t srcid, nodeid_t destid,
 868                                         u16 ether_type)
 869 {
 870         struct eth1394_priv *priv = netdev_priv(dev);
 871         u64 dest_hw;
 872         unsigned short ret = 0;
 873
 874         /* Setup our hw addresses. We use these to build the
 875          * ethernet header.  */
 876         if (destid == (LOCAL_BUS | ALL_NODES))
 877                 dest_hw = ~0ULL;  /* broadcast */
 878         else
 879                 dest_hw = cpu_to_be64((((u64)priv->host->csr.guid_hi) << 32) |
 880                                       priv->host->csr.guid_lo);
 881
 882         /* If this is an ARP packet, convert it. First, we want to make
 883          * use of some of the fields, since they tell us a little bit
 884          * about the sending machine.  */
 885         if (ether_type == htons(ETH_P_ARP)) {
 886                 struct eth1394_arp *arp1394 = (struct eth1394_arp*)skb->data;
 887                 struct arphdr *arp = (struct arphdr *)skb->data;
 888                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 889                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 890                         ntohl(arp1394->fifo_lo);
 891                 u8 max_rec = min(priv->host->csr.max_rec,
 892                                  (u8)(arp1394->max_rec));
 893                 int sspd = arp1394->sspd;
 894                 u16 maxpayload;
 895                 struct eth1394_node_ref *node;
 896                 struct eth1394_node_info *node_info;
 897
 898                 /* Sanity check. MacOSX seems to be sending us 131 in this
 899                  * field (atleast on my Panther G5). Not sure why. */
 900                 if (sspd > 5 || sspd < 0)
 901                         sspd = 0;
 902
 903                 maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
 904
 905                 node = eth1394_find_node_guid(&priv->ip_node_list,
 906                                               be64_to_cpu(arp1394->s_uniq_id));
 907                 if (!node) {
 908                         return 0;
 909                 }
 910
 911                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 912
 913                 /* Update our speed/payload/fifo_offset table */
 914                 node_info->maxpayload = maxpayload;
 915                 node_info->sspd =       sspd;
 916                 node_info->fifo =       fifo_addr;
 917
 918                 /* Now that we're done with the 1394 specific stuff, we'll
 919                  * need to alter some of the data.  Believe it or not, all
 920                  * that needs to be done is sender_IP_address needs to be
 921                  * moved, the destination hardware address get stuffed
 922                  * in and the hardware address length set to 8.
 923                  *
 924                  * IMPORTANT: The code below overwrites 1394 specific data
 925                  * needed above so keep the munging of the data for the
 926                  * higher level IP stack last. */
 927
 928                 arp->ar_hln = 8;
 929                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 930                 *(u32*)arp_ptr = arp1394->sip;  /* move sender IP addr */
 931                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 932
 933                 if (arp->ar_op == htons(ARPOP_REQUEST))
 934                         /* just set ARP req target unique ID to 0 */
 935                         *((u64*)arp_ptr) = 0;
 936                 else
 937                         *((u64*)arp_ptr) = *((u64*)dev->dev_addr);
 938         }
 939
 940         /* Now add the ethernet header. */
 941         if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 942                              skb->len) >= 0)
 943                 ret = ether1394_type_trans(skb, dev);
 944
 945         return ret;
 946 }
 947
 948 static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
 949 {
 950         struct fragment_info *fi;
 951
 952         list_for_each_entry(fi, frag_list, list) {
 953                 if ( ! ((offset > (fi->offset + fi->len - 1)) ||
 954                        ((offset + len - 1) < fi->offset)))
 955                         return 1;
 956         }
 957         return 0;
 958 }
 959
 960 static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 961 {
 962         struct partial_datagram *pd;
 963
 964         list_for_each_entry(pd, pdgl, list) {
 965                 if (pd->dgl == dgl)
 966                         return &pd->list;
 967         }
 968         return NULL;
 969 }
 970
 971 /* Assumes that new fragment does not overlap any existing fragments */
 972 static inline int new_fragment(struct list_head *frag_info, int offset, int len)
 973 {
 974         struct list_head *lh;
 975         struct fragment_info *fi, *fi2, *new;
 976
 977         list_for_each(lh, frag_info) {
 978                 fi = list_entry(lh, struct fragment_info, list);
 979                 if ((fi->offset + fi->len) == offset) {
 980                         /* The new fragment can be tacked on to the end */
 981                         fi->len += len;
 982                         /* Did the new fragment plug a hole? */
 983                         fi2 = list_entry(lh->next, struct fragment_info, list);
 984                         if ((fi->offset + fi->len) == fi2->offset) {
 985                                 /* glue fragments together */
 986                                 fi->len += fi2->len;
 987                                 list_del(lh->next);
 988                                 kfree(fi2);
 989                         }
 990                         return 0;
 991                 } else if ((offset + len) == fi->offset) {
 992                         /* The new fragment can be tacked on to the beginning */
 993                         fi->offset = offset;
 994                         fi->len += len;
 995                         /* Did the new fragment plug a hole? */
 996                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 997                         if ((fi2->offset + fi2->len) == fi->offset) {
 998                                 /* glue fragments together */
 999                                 fi2->len += fi->len;
1000                                 list_del(lh);
1001                                 kfree(fi);
1002                         }
1003                         return 0;
1004                 } else if (offset > (fi->offset + fi->len)) {
1005                         break;
1006                 } else if ((offset + len) < fi->offset) {
1007                         lh = lh->prev;
1008                         break;
1009                 }
1010         }
1011
1012         new = kmalloc(sizeof(*new), GFP_ATOMIC);
1013         if (!new)
1014                 return -ENOMEM;
1015
1016         new->offset = offset;
1017         new->len = len;
1018
1019         list_add(&new->list, lh);
1020
1021         return 0;
1022 }
1023
1024 static inline int new_partial_datagram(struct net_device *dev,
1025                                        struct list_head *pdgl, int dgl,
1026                                        int dg_size, char *frag_buf,
1027                                        int frag_off, int frag_len)
1028 {
1029         struct partial_datagram *new;
1030
1031         new = kmalloc(sizeof(*new), GFP_ATOMIC);
1032         if (!new)
1033                 return -ENOMEM;
1034
1035         INIT_LIST_HEAD(&new->frag_info);
1036
1037         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1038                 kfree(new);
1039                 return -ENOMEM;
1040         }
1041
1042         new->dgl = dgl;
1043         new->dg_size = dg_size;
1044
1045         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1046         if (!new->skb) {
1047                 struct fragment_info *fi = list_entry(new->frag_info.next,
1048                                                       struct fragment_info,
1049                                                       list);
1050                 kfree(fi);
1051                 kfree(new);
1052                 return -ENOMEM;
1053         }
1054
1055         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1056         new->pbuf = skb_put(new->skb, dg_size);
1057         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1058
1059         list_add(&new->list, pdgl);
1060
1061         return 0;
1062 }
1063
1064 static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1065                                           char *frag_buf, int frag_off, int frag_len)
1066 {
1067         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1068
1069         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
1070                 return -ENOMEM;
1071         }
1072
1073         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1074
1075         /* Move list entry to beginnig of list so that oldest partial
1076          * datagrams percolate to the end of the list */
1077         list_move(lh, pdgl);
1078
1079         return 0;
1080 }
1081
1082 static inline int is_datagram_complete(struct list_head *lh, int dg_size)
1083 {
1084         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1085         struct fragment_info *fi = list_entry(pd->frag_info.next,
1086                                               struct fragment_info, list);
1087
1088         return (fi->len == dg_size);
1089 }
1090
1091 /* Packet reception. We convert the IP1394 encapsulation header to an
1092  * ethernet header, and fill it with some of our other fields. This is
1093  * an incoming packet from the 1394 bus.  */
1094 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1095                                   char *buf, int len)
1096 {
1097         struct sk_buff *skb;
1098         unsigned long flags;
1099         struct eth1394_priv *priv = netdev_priv(dev);
1100         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1101         u16 ether_type = 0;  /* initialized to clear warning */
1102         int hdr_len;
1103         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1104         struct eth1394_node_info *node_info;
1105
1106         if (!ud) {
1107                 struct eth1394_node_ref *node;
1108                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1109                 if (!node) {
1110                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1111                                    "lookup failure: " NODE_BUS_FMT,
1112                                    NODE_BUS_ARGS(priv->host, srcid));
1113                         priv->stats.rx_dropped++;
1114                         return -1;
1115                 }
1116                 ud = node->ud;
1117
1118                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1119         }
1120
1121         node_info = (struct eth1394_node_info*)ud->device.driver_data;
1122
1123         /* First, did we receive a fragmented or unfragmented datagram? */
1124         hdr->words.word1 = ntohs(hdr->words.word1);
1125
1126         hdr_len = hdr_type_len[hdr->common.lf];
1127
1128         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1129                 /* An unfragmented datagram has been received by the ieee1394
1130                  * bus. Build an skbuff around it so we can pass it to the
1131                  * high level network layer. */
1132
1133                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1134                 if (!skb) {
1135                         HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
1136                         priv->stats.rx_dropped++;
1137                         return -1;
1138                 }
1139                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1140                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
1141                 ether_type = hdr->uf.ether_type;
1142         } else {
1143                 /* A datagram fragment has been received, now the fun begins. */
1144
1145                 struct list_head *pdgl, *lh;
1146                 struct partial_datagram *pd;
1147                 int fg_off;
1148                 int fg_len = len - hdr_len;
1149                 int dg_size;
1150                 int dgl;
1151                 int retval;
1152                 struct pdg_list *pdg = &(node_info->pdg);
1153
1154                 hdr->words.word3 = ntohs(hdr->words.word3);
1155                 /* The 4th header word is reserved so no need to do ntohs() */
1156
1157                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1158                         ether_type = hdr->ff.ether_type;
1159                         dgl = hdr->ff.dgl;
1160                         dg_size = hdr->ff.dg_size + 1;
1161                         fg_off = 0;
1162                 } else {
1163                         hdr->words.word2 = ntohs(hdr->words.word2);
1164                         dgl = hdr->sf.dgl;
1165                         dg_size = hdr->sf.dg_size + 1;
1166                         fg_off = hdr->sf.fg_off;
1167                 }
1168                 spin_lock_irqsave(&pdg->lock, flags);
1169
1170                 pdgl = &(pdg->list);
1171                 lh = find_partial_datagram(pdgl, dgl);
1172
1173                 if (lh == NULL) {
1174                         while (pdg->sz >= max_partial_datagrams) {
1175                                 /* remove the oldest */
1176                                 purge_partial_datagram(pdgl->prev);
1177                                 pdg->sz--;
1178                         }
1179
1180                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1181                                                       buf + hdr_len, fg_off,
1182                                                       fg_len);
1183                         if (retval < 0) {
1184                                 spin_unlock_irqrestore(&pdg->lock, flags);
1185                                 goto bad_proto;
1186                         }
1187                         pdg->sz++;
1188                         lh = find_partial_datagram(pdgl, dgl);
1189                 } else {
1190                         struct partial_datagram *pd;
1191
1192                         pd = list_entry(lh, struct partial_datagram, list);
1193
1194                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1195                                 /* Overlapping fragments, obliterate old
1196                                  * datagram and start new one. */
1197                                 purge_partial_datagram(lh);
1198                                 retval = new_partial_datagram(dev, pdgl, dgl,
1199                                                               dg_size,
1200                                                               buf + hdr_len,
1201                                                               fg_off, fg_len);
1202                                 if (retval < 0) {
1203                                         pdg->sz--;
1204                                         spin_unlock_irqrestore(&pdg->lock, flags);
1205                                         goto bad_proto;
1206                                 }
1207                         } else {
1208                                 retval = update_partial_datagram(pdgl, lh,
1209                                                                  buf + hdr_len,
1210                                                                  fg_off, fg_len);
1211                                 if (retval < 0) {
1212                                         /* Couldn't save off fragment anyway
1213                                          * so might as well obliterate the
1214                                          * datagram now. */
1215                                         purge_partial_datagram(lh);
1216                                         pdg->sz--;
1217                                         spin_unlock_irqrestore(&pdg->lock, flags);
1218                                         goto bad_proto;
1219                                 }
1220                         } /* fragment overlap */
1221                 } /* new datagram or add to existing one */
1222
1223                 pd = list_entry(lh, struct partial_datagram, list);
1224
1225                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1226                         pd->ether_type = ether_type;
1227                 }
1228
1229                 if (is_datagram_complete(lh, dg_size)) {
1230                         ether_type = pd->ether_type;
1231                         pdg->sz--;
1232                         skb = skb_get(pd->skb);
1233                         purge_partial_datagram(lh);
1234                         spin_unlock_irqrestore(&pdg->lock, flags);
1235                 } else {
1236                         /* Datagram is not complete, we're done for the
1237                          * moment. */
1238                         spin_unlock_irqrestore(&pdg->lock, flags);
1239                         return 0;
1240                 }
1241         } /* unframgented datagram or fragmented one */
1242
1243         /* Write metadata, and then pass to the receive level */
1244         skb->dev = dev;
1245         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1246
1247         /* Parse the encapsulation header. This actually does the job of
1248          * converting to an ethernet frame header, aswell as arp
1249          * conversion if needed. ARP conversion is easier in this
1250          * direction, since we are using ethernet as our backend.  */
1251         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1252                                               ether_type);
1253
1254
1255         spin_lock_irqsave(&priv->lock, flags);
1256         if (!skb->protocol) {
1257                 priv->stats.rx_errors++;
1258                 priv->stats.rx_dropped++;
1259                 dev_kfree_skb_any(skb);
1260                 goto bad_proto;
1261         }
1262
1263         if (netif_rx(skb) == NET_RX_DROP) {
1264                 priv->stats.rx_errors++;
1265                 priv->stats.rx_dropped++;
1266                 goto bad_proto;
1267         }
1268
1269         /* Statistics */
1270         priv->stats.rx_packets++;
1271         priv->stats.rx_bytes += skb->len;
1272
1273 bad_proto:
1274         if (netif_queue_stopped(dev))
1275                 netif_wake_queue(dev);
1276         spin_unlock_irqrestore(&priv->lock, flags);
1277
1278         dev->last_rx = jiffies;
1279
1280         return 0;
1281 }
1282
1283 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1284                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1285 {
1286         struct eth1394_host_info *hi;
1287
1288         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1289         if (hi == NULL) {
1290                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1291                                 host->driver->name);
1292                 return RCODE_ADDRESS_ERROR;
1293         }
1294
1295         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1296                 return RCODE_ADDRESS_ERROR;
1297         else
1298                 return RCODE_COMPLETE;
1299 }
1300
1301 static void ether1394_iso(struct hpsb_iso *iso)
1302 {
1303         quadlet_t *data;
1304         char *buf;
1305         struct eth1394_host_info *hi;
1306         struct net_device *dev;
1307         struct eth1394_priv *priv;
1308         unsigned int len;
1309         u32 specifier_id;
1310         u16 source_id;
1311         int i;
1312         int nready;
1313
1314         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1315         if (hi == NULL) {
1316                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1317                                 iso->host->driver->name);
1318                 return;
1319         }
1320
1321         dev = hi->dev;
1322
1323         nready = hpsb_iso_n_ready(iso);
1324         for (i = 0; i < nready; i++) {
1325                 struct hpsb_iso_packet_info *info =
1326                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1327                 data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
1328
1329                 /* skip over GASP header */
1330                 buf = (char *)data + 8;
1331                 len = info->len - 8;
1332
1333                 specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
1334                                 ((be32_to_cpu(data[1]) & 0xff000000) >> 24));
1335                 source_id = be32_to_cpu(data[0]) >> 16;
1336
1337                 priv = netdev_priv(dev);
1338
1339                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
1340                    specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1341                         /* This packet is not for us */
1342                         continue;
1343                 }
1344                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1345                                        buf, len);
1346         }
1347
1348         hpsb_iso_recv_release_packets(iso, i);
1349
1350         dev->last_rx = jiffies;
1351 }
1352
1353 /******************************************
1354  * Datagram transmission code
1355  ******************************************/
1356
1357 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1358  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1359  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1360  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1361  * judge.
1362  *
1363  * Now that the EUI is used for the hardware address all we need to do to make
1364  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1365  * speed, and unicast FIFO address information between the sender_unique_id
1366  * and the IP addresses.
1367  */
1368 static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
1369                                             struct net_device *dev)
1370 {
1371         struct eth1394_priv *priv = netdev_priv(dev);
1372
1373         struct arphdr *arp = (struct arphdr *)skb->data;
1374         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1375         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1376
1377         /* Believe it or not, all that need to happen is sender IP get moved
1378          * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
1379         arp1394->hw_addr_len    = 16;
1380         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1381         arp1394->max_rec        = priv->host->csr.max_rec;
1382         arp1394->sspd           = priv->host->csr.lnk_spd;
1383         arp1394->fifo_hi        = htons (priv->local_fifo >> 32);
1384         arp1394->fifo_lo        = htonl (priv->local_fifo & ~0x0);
1385
1386         return;
1387 }
1388
1389 /* We need to encapsulate the standard header with our own. We use the
1390  * ethernet header's proto for our own. */
1391 static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1392                                                       __be16 proto,
1393                                                       union eth1394_hdr *hdr,
1394                                                       u16 dg_size, u16 dgl)
1395 {
1396         unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1397
1398         /* Does it all fit in one packet? */
1399         if (dg_size <= adj_max_payload) {
1400                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1401                 hdr->uf.ether_type = proto;
1402         } else {
1403                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1404                 hdr->ff.ether_type = proto;
1405                 hdr->ff.dg_size = dg_size - 1;
1406                 hdr->ff.dgl = dgl;
1407                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1408         }
1409         return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
1410 }
1411
1412 static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
1413                                                  unsigned int max_payload,
1414                                                  union eth1394_hdr *hdr)
1415 {
1416         union eth1394_hdr *bufhdr;
1417         int ftype = hdr->common.lf;
1418         int hdrsz = hdr_type_len[ftype];
1419         unsigned int adj_max_payload = max_payload - hdrsz;
1420
1421         switch(ftype) {
1422         case ETH1394_HDR_LF_UF:
1423                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1424                 bufhdr->words.word1 = htons(hdr->words.word1);
1425                 bufhdr->words.word2 = hdr->words.word2;
1426                 break;
1427
1428         case ETH1394_HDR_LF_FF:
1429                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1430                 bufhdr->words.word1 = htons(hdr->words.word1);
1431                 bufhdr->words.word2 = hdr->words.word2;
1432                 bufhdr->words.word3 = htons(hdr->words.word3);
1433                 bufhdr->words.word4 = 0;
1434
1435                 /* Set frag type here for future interior fragments */
1436                 hdr->common.lf = ETH1394_HDR_LF_IF;
1437                 hdr->sf.fg_off = 0;
1438                 break;
1439
1440         default:
1441                 hdr->sf.fg_off += adj_max_payload;
1442                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1443                 if (max_payload >= skb->len)
1444                         hdr->common.lf = ETH1394_HDR_LF_LF;
1445                 bufhdr->words.word1 = htons(hdr->words.word1);
1446                 bufhdr->words.word2 = htons(hdr->words.word2);
1447                 bufhdr->words.word3 = htons(hdr->words.word3);
1448                 bufhdr->words.word4 = 0;
1449         }
1450
1451         return min(max_payload, skb->len);
1452 }
1453
1454 static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1455 {
1456         struct hpsb_packet *p;
1457
1458         p = hpsb_alloc_packet(0);
1459         if (p) {
1460                 p->host = host;
1461                 p->generation = get_hpsb_generation(host);
1462                 p->type = hpsb_async;
1463         }
1464         return p;
1465 }
1466
1467 static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
1468                                               struct hpsb_host *host,
1469                                               nodeid_t node, u64 addr,
1470                                               void * data, int tx_len)
1471 {
1472         p->node_id = node;
1473         p->data = NULL;
1474
1475         p->tcode = TCODE_WRITEB;
1476         p->header[1] = (host->node_id << 16) | (addr >> 32);
1477         p->header[2] = addr & 0xffffffff;
1478
1479         p->header_size = 16;
1480         p->expect_response = 1;
1481
1482         if (hpsb_get_tlabel(p)) {
1483                 ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
1484                                 "to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
1485                 return -1;
1486         }
1487         p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
1488                 | (1 << 8) | (TCODE_WRITEB << 4);
1489
1490         p->header[3] = tx_len << 16;
1491         p->data_size = (tx_len + 3) & ~3;
1492         p->data = (quadlet_t*)data;
1493
1494         return 0;
1495 }
1496
1497 static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1498                                               struct eth1394_priv *priv,
1499                                               struct sk_buff *skb, int length)
1500 {
1501         p->header_size = 4;
1502         p->tcode = TCODE_STREAM_DATA;
1503
1504         p->header[0] = (length << 16) | (3 << 14)
1505                 | ((priv->broadcast_channel) << 8)
1506                 | (TCODE_STREAM_DATA << 4);
1507         p->data_size = length;
1508         p->data = ((quadlet_t*)skb->data) - 2;
1509         p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
1510                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1511         p->data[1] = cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
1512                                  ETHER1394_GASP_VERSION);
1513
1514         /* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
1515          * prevents hpsb_send_packet() from setting the speed to an arbitrary
1516          * value based on packet->node_id if packet->node_id is not set. */
1517         p->node_id = ALL_NODES;
1518         p->speed_code = priv->bc_sspd;
1519 }
1520
1521 static inline void ether1394_free_packet(struct hpsb_packet *packet)
1522 {
1523         if (packet->tcode != TCODE_STREAM_DATA)
1524                 hpsb_free_tlabel(packet);
1525         hpsb_free_packet(packet);
1526 }
1527
1528 static void ether1394_complete_cb(void *__ptask);
1529
1530 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1531 {
1532         struct eth1394_priv *priv = ptask->priv;
1533         struct hpsb_packet *packet = NULL;
1534
1535         packet = ether1394_alloc_common_packet(priv->host);
1536         if (!packet)
1537                 return -1;
1538
1539         if (ptask->tx_type == ETH1394_GASP) {
1540                 int length = tx_len + (2 * sizeof(quadlet_t));
1541
1542                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1543         } else if (ether1394_prep_write_packet(packet, priv->host,
1544                                                ptask->dest_node,
1545                                                ptask->addr, ptask->skb->data,
1546                                                tx_len)) {
1547                 hpsb_free_packet(packet);
1548                 return -1;
1549         }
1550
1551         ptask->packet = packet;
1552         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1553                                       ptask);
1554
1555         if (hpsb_send_packet(packet) < 0) {
1556                 ether1394_free_packet(packet);
1557                 return -1;
1558         }
1559
1560         return 0;
1561 }
1562
1563
1564 /* Task function to be run when a datagram transmission is completed */
1565 static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
1566 {
1567         struct sk_buff *skb = ptask->skb;
1568         struct net_device *dev = skb->dev;
1569         struct eth1394_priv *priv = netdev_priv(dev);
1570         unsigned long flags;
1571
1572         /* Statistics */
1573         spin_lock_irqsave(&priv->lock, flags);
1574         if (fail) {
1575                 priv->stats.tx_dropped++;
1576                 priv->stats.tx_errors++;
1577         } else {
1578                 priv->stats.tx_bytes += skb->len;
1579                 priv->stats.tx_packets++;
1580         }
1581         spin_unlock_irqrestore(&priv->lock, flags);
1582
1583         dev_kfree_skb_any(skb);
1584         kmem_cache_free(packet_task_cache, ptask);
1585 }
1586
1587
1588 /* Callback for when a packet has been sent and the status of that packet is
1589  * known */
1590 static void ether1394_complete_cb(void *__ptask)
1591 {
1592         struct packet_task *ptask = (struct packet_task *)__ptask;
1593         struct hpsb_packet *packet = ptask->packet;
1594         int fail = 0;
1595
1596         if (packet->tcode != TCODE_STREAM_DATA)
1597                 fail = hpsb_packet_success(packet);
1598
1599         ether1394_free_packet(packet);
1600
1601         ptask->outstanding_pkts--;
1602         if (ptask->outstanding_pkts > 0 && !fail) {
1603                 int tx_len;
1604
1605                 /* Add the encapsulation header to the fragment */
1606                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1607                                                &ptask->hdr);
1608                 if (ether1394_send_packet(ptask, tx_len))
1609                         ether1394_dg_complete(ptask, 1);
1610         } else {
1611                 ether1394_dg_complete(ptask, fail);
1612         }
1613 }
1614
1615
1616
1617 /* Transmit a packet (called by kernel) */
1618 static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
1619 {
1620         gfp_t kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
1621         struct eth1394hdr *eth;
1622         struct eth1394_priv *priv = netdev_priv(dev);
1623         __be16 proto;
1624         unsigned long flags;
1625         nodeid_t dest_node;
1626         eth1394_tx_type tx_type;
1627         int ret = 0;
1628         unsigned int tx_len;
1629         unsigned int max_payload;
1630         u16 dg_size;
1631         u16 dgl;
1632         struct packet_task *ptask;
1633         struct eth1394_node_ref *node;
1634         struct eth1394_node_info *node_info = NULL;
1635
1636         ptask = kmem_cache_alloc(packet_task_cache, kmflags);
1637         if (ptask == NULL) {
1638                 ret = -ENOMEM;
1639                 goto fail;
1640         }
1641
1642         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1643          * it does not set our validity bit. We need to compensate for
1644          * that somewhere else, but not in eth1394. */
1645 #if 0
1646         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
1647                 ret = -EAGAIN;
1648                 goto fail;
1649         }
1650 #endif
1651
1652         if ((skb = skb_share_check (skb, kmflags)) == NULL) {
1653                 ret = -ENOMEM;
1654                 goto fail;
1655         }
1656
1657         /* Get rid of the fake eth1394 header, but save a pointer */
1658         eth = (struct eth1394hdr*)skb->data;
1659         skb_pull(skb, ETH1394_HLEN);
1660
1661         proto = eth->h_proto;
1662         dg_size = skb->len;
1663
1664         /* Set the transmission type for the packet.  ARP packets and IP
1665          * broadcast packets are sent via GASP. */
1666         if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1667             proto == htons(ETH_P_ARP) ||
1668             (proto == htons(ETH_P_IP) &&
1669              IN_MULTICAST(ntohl(skb->nh.iph->daddr)))) {
1670                 tx_type = ETH1394_GASP;
1671                 dest_node = LOCAL_BUS | ALL_NODES;
1672                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1673                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1674                 dgl = priv->bc_dgl;
1675                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1676                         priv->bc_dgl++;
1677         } else {
1678                 node = eth1394_find_node_guid(&priv->ip_node_list,
1679                                               be64_to_cpu(*(u64*)eth->h_dest));
1680                 if (!node) {
1681                         ret = -EAGAIN;
1682                         goto fail;
1683                 }
1684                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
1685                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE) {
1686                         ret = -EAGAIN;
1687                         goto fail;
1688                 }
1689
1690                 dest_node = node->ud->ne->nodeid;
1691                 max_payload = node_info->maxpayload;
1692                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1693
1694                 dgl = node_info->dgl;
1695                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1696                         node_info->dgl++;
1697                 tx_type = ETH1394_WRREQ;
1698         }
1699
1700         /* If this is an ARP packet, convert it */
1701         if (proto == htons(ETH_P_ARP))
1702                 ether1394_arp_to_1394arp (skb, dev);
1703
1704         ptask->hdr.words.word1 = 0;
1705         ptask->hdr.words.word2 = 0;
1706         ptask->hdr.words.word3 = 0;
1707         ptask->hdr.words.word4 = 0;
1708         ptask->skb = skb;
1709         ptask->priv = priv;
1710         ptask->tx_type = tx_type;
1711
1712         if (tx_type != ETH1394_GASP) {
1713                 u64 addr;
1714
1715                 spin_lock_irqsave(&priv->lock, flags);
1716                 addr = node_info->fifo;
1717                 spin_unlock_irqrestore(&priv->lock, flags);
1718
1719                 ptask->addr = addr;
1720                 ptask->dest_node = dest_node;
1721         }
1722
1723         ptask->tx_type = tx_type;
1724         ptask->max_payload = max_payload;
1725         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
1726                                                              &ptask->hdr, dg_size,
1727                                                              dgl);
1728
1729         /* Add the encapsulation header to the fragment */
1730         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1731         dev->trans_start = jiffies;
1732         if (ether1394_send_packet(ptask, tx_len))
1733                 goto fail;
1734
1735         netif_wake_queue(dev);
1736         return 0;
1737 fail:
1738         if (ptask)
1739                 kmem_cache_free(packet_task_cache, ptask);
1740
1741         if (skb != NULL)
1742                 dev_kfree_skb(skb);
1743
1744         spin_lock_irqsave (&priv->lock, flags);
1745         priv->stats.tx_dropped++;
1746         priv->stats.tx_errors++;
1747         spin_unlock_irqrestore (&priv->lock, flags);
1748
1749         if (netif_queue_stopped(dev))
1750                 netif_wake_queue(dev);
1751
1752         return 0;  /* returning non-zero causes serious problems */
1753 }
1754
1755 static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1756 {
1757         strcpy (info->driver, driver_name);
1758         /* FIXME XXX provide sane businfo */
1759         strcpy (info->bus_info, "ieee1394");
1760 }
1761
1762 static struct ethtool_ops ethtool_ops = {
1763         .get_drvinfo = ether1394_get_drvinfo
1764 };
1765
1766 static int __init ether1394_init_module (void)
1767 {
1768         packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
1769                                               0, 0, NULL, NULL);
1770
1771         /* Register ourselves as a highlevel driver */
1772         hpsb_register_highlevel(&eth1394_highlevel);
1773
1774         return hpsb_register_protocol(&eth1394_proto_driver);
1775 }
1776
1777 static void __exit ether1394_exit_module (void)
1778 {
1779         hpsb_unregister_protocol(&eth1394_proto_driver);
1780         hpsb_unregister_highlevel(&eth1394_highlevel);
1781         kmem_cache_destroy(packet_task_cache);
1782 }
1783
1784 module_init(ether1394_init_module);
1785 module_exit(ether1394_exit_module);