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 <asm/semaphore.h>
  68 #include <net/arp.h>
  69
  70 #include "csr1212.h"
  71 #include "ieee1394_types.h"
  72 #include "ieee1394_core.h"
  73 #include "ieee1394_transactions.h"
  74 #include "ieee1394.h"
  75 #include "highlevel.h"
  76 #include "iso.h"
  77 #include "nodemgr.h"
  78 #include "eth1394.h"
  79 #include "config_roms.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 static char version[] __devinitdata =
  92         "$Rev: 1224 $ Ben Collins <bcollins@debian.org>";
  93
  94 struct fragment_info {
  95         struct list_head list;
  96         int offset;
  97         int len;
  98 };
  99
 100 struct partial_datagram {
 101         struct list_head list;
 102         u16 dgl;
 103         u16 dg_size;
 104         u16 ether_type;
 105         struct sk_buff *skb;
 106         char *pbuf;
 107         struct list_head frag_info;
 108 };
 109
 110 struct pdg_list {
 111         struct list_head list;          /* partial datagram list per node       */
 112         unsigned int sz;                /* partial datagram list size per node  */
 113         spinlock_t lock;                /* partial datagram lock                */
 114 };
 115
 116 struct eth1394_host_info {
 117         struct hpsb_host *host;
 118         struct net_device *dev;
 119 };
 120
 121 struct eth1394_node_ref {
 122         struct unit_directory *ud;
 123         struct list_head list;
 124 };
 125
 126 struct eth1394_node_info {
 127         u16 maxpayload;                 /* Max payload                  */
 128         u8 sspd;                        /* Max speed                    */
 129         u64 fifo;                       /* FIFO address                 */
 130         struct pdg_list pdg;            /* partial RX datagram lists    */
 131         int dgl;                        /* Outgoing datagram label      */
 132 };
 133
 134 /* Our ieee1394 highlevel driver */
 135 #define ETH1394_DRIVER_NAME "ip1394"
 136 static const char driver_name[] = ETH1394_DRIVER_NAME;
 137
 138 static kmem_cache_t *packet_task_cache;
 139
 140 static struct hpsb_highlevel eth1394_highlevel;
 141
 142 /* Use common.lf to determine header len */
 143 static const int hdr_type_len[] = {
 144         sizeof (struct eth1394_uf_hdr),
 145         sizeof (struct eth1394_ff_hdr),
 146         sizeof (struct eth1394_sf_hdr),
 147         sizeof (struct eth1394_sf_hdr)
 148 };
 149
 150 /* Change this to IEEE1394_SPEED_S100 to make testing easier */
 151 #define ETH1394_SPEED_DEF       IEEE1394_SPEED_MAX
 152
 153 /* For now, this needs to be 1500, so that XP works with us */
 154 #define ETH1394_DATA_LEN        ETH_DATA_LEN
 155
 156 static const u16 eth1394_speedto_maxpayload[] = {
 157 /*     S100, S200, S400, S800, S1600, S3200 */
 158         512, 1024, 2048, 4096,  4096,  4096
 159 };
 160
 161 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
 162 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
 163 MODULE_LICENSE("GPL");
 164
 165 /* The max_partial_datagrams parameter is the maximum number of fragmented
 166  * datagrams per node that eth1394 will keep in memory.  Providing an upper
 167  * bound allows us to limit the amount of memory that partial datagrams
 168  * consume in the event that some partial datagrams are never completed.  This
 169  * should probably change to a sysctl item or the like if possible.
 170  */
 171 MODULE_PARM(max_partial_datagrams, "i");
 172 MODULE_PARM_DESC(max_partial_datagrams,
 173                  "Maximum number of partially received fragmented datagrams "
 174                  "(default = 25).");
 175 static int max_partial_datagrams = 25;
 176
 177
 178 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 179                             unsigned short type, void *daddr, void *saddr,
 180                             unsigned len);
 181 static int ether1394_rebuild_header(struct sk_buff *skb);
 182 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
 183 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 184 static void ether1394_header_cache_update(struct hh_cache *hh,
 185                                           struct net_device *dev,
 186                                           unsigned char * haddr);
 187 static int ether1394_mac_addr(struct net_device *dev, void *p);
 188
 189 static inline void purge_partial_datagram(struct list_head *old);
 190 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 191 static void ether1394_iso(struct hpsb_iso *iso);
 192
 193 static int ether1394_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
 194 static int ether1394_ethtool_ioctl(struct net_device *dev, void __user *useraddr);
 195
 196 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 197                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 198 static void ether1394_add_host (struct hpsb_host *host);
 199 static void ether1394_remove_host (struct hpsb_host *host);
 200 static void ether1394_host_reset (struct hpsb_host *host);
 201
 202 /* Function for incoming 1394 packets */
 203 static struct hpsb_address_ops addr_ops = {
 204         .write =        ether1394_write,
 205 };
 206
 207 /* Ieee1394 highlevel driver functions */
 208 static struct hpsb_highlevel eth1394_highlevel = {
 209         .name =         driver_name,
 210         .add_host =     ether1394_add_host,
 211         .remove_host =  ether1394_remove_host,
 212         .host_reset =   ether1394_host_reset,
 213 };
 214
 215
 216 /* This is called after an "ifup" */
 217 static int ether1394_open (struct net_device *dev)
 218 {
 219         struct eth1394_priv *priv = dev->priv;
 220         int ret = 0;
 221
 222         /* Something bad happened, don't even try */
 223         if (priv->bc_state == ETHER1394_BC_ERROR) {
 224                 /* we'll try again */
 225                 priv->iso = hpsb_iso_recv_init(priv->host,
 226                                                ETHER1394_GASP_BUFFERS * 2 *
 227                                                (1 << (priv->host->csr.max_rec +
 228                                                       1)),
 229                                                ETHER1394_GASP_BUFFERS,
 230                                                priv->broadcast_channel,
 231                                                HPSB_ISO_DMA_PACKET_PER_BUFFER,
 232                                                1, ether1394_iso);
 233                 if (priv->iso == NULL) {
 234                         ETH1394_PRINT(KERN_ERR, dev->name,
 235                                       "Could not allocate isochronous receive "
 236                                       "context for the broadcast channel\n");
 237                         priv->bc_state = ETHER1394_BC_ERROR;
 238                         ret = -EAGAIN;
 239                 } else {
 240                         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 241                                 priv->bc_state = ETHER1394_BC_STOPPED;
 242                         else
 243                                 priv->bc_state = ETHER1394_BC_RUNNING;
 244                 }
 245         }
 246
 247         if (ret)
 248                 return ret;
 249
 250         netif_start_queue (dev);
 251         return 0;
 252 }
 253
 254 /* This is called after an "ifdown" */
 255 static int ether1394_stop (struct net_device *dev)
 256 {
 257         netif_stop_queue (dev);
 258         return 0;
 259 }
 260
 261 /* Return statistics to the caller */
 262 static struct net_device_stats *ether1394_stats (struct net_device *dev)
 263 {
 264         return &(((struct eth1394_priv *)dev->priv)->stats);
 265 }
 266
 267 /* What to do if we timeout. I think a host reset is probably in order, so
 268  * that's what we do. Should we increment the stat counters too?  */
 269 static void ether1394_tx_timeout (struct net_device *dev)
 270 {
 271         ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
 272                        ((struct eth1394_priv *)(dev->priv))->host->driver->name);
 273
 274         highlevel_host_reset (((struct eth1394_priv *)(dev->priv))->host);
 275
 276         netif_wake_queue (dev);
 277 }
 278
 279 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 280 {
 281         struct eth1394_priv *priv = dev->priv;
 282
 283         if ((new_mtu < 68) ||
 284             (new_mtu > min(ETH1394_DATA_LEN,
 285                            (int)((1 << (priv->host->csr.max_rec + 1)) -
 286                                  (sizeof(union eth1394_hdr) +
 287                                   ETHER1394_GASP_OVERHEAD)))))
 288                 return -EINVAL;
 289         dev->mtu = new_mtu;
 290         return 0;
 291 }
 292
 293
 294 /******************************************
 295  * 1394 bus activity functions
 296  ******************************************/
 297
 298 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 299                                                   struct unit_directory *ud)
 300 {
 301         struct eth1394_node_ref *node;
 302
 303         list_for_each_entry(node, inl, list)
 304                 if (node->ud == ud)
 305                         return node;
 306
 307         return NULL;
 308 }
 309
 310 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 311                                                        u64 guid)
 312 {
 313         struct eth1394_node_ref *node;
 314
 315         list_for_each_entry(node, inl, list)
 316                 if (node->ud->ne->guid == guid)
 317                         return node;
 318
 319         return NULL;
 320 }
 321
 322 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 323                                                          nodeid_t nodeid)
 324 {
 325         struct eth1394_node_ref *node;
 326         list_for_each_entry(node, inl, list) {
 327                 if (node->ud->ne->nodeid == nodeid)
 328                         return node;
 329         }
 330
 331         return NULL;
 332 }
 333
 334 static int eth1394_probe(struct device *dev)
 335 {
 336         struct unit_directory *ud;
 337         struct eth1394_host_info *hi;
 338         struct eth1394_priv *priv;
 339         struct eth1394_node_ref *new_node;
 340         struct eth1394_node_info *node_info;
 341
 342         ud = container_of(dev, struct unit_directory, device);
 343
 344         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 345         if (!hi)
 346                 return -ENOENT;
 347
 348         new_node = kmalloc(sizeof(struct eth1394_node_ref),
 349                            in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 350         if (!new_node)
 351                 return -ENOMEM;
 352
 353         node_info = kmalloc(sizeof(struct eth1394_node_info),
 354                             in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 355         if (!node_info) {
 356                 kfree(new_node);
 357                 return -ENOMEM;
 358         }
 359
 360         spin_lock_init(&node_info->pdg.lock);
 361         INIT_LIST_HEAD(&node_info->pdg.list);
 362         node_info->pdg.sz = 0;
 363         node_info->fifo = ETHER1394_INVALID_ADDR;
 364
 365         ud->device.driver_data = node_info;
 366         new_node->ud = ud;
 367
 368         priv = (struct eth1394_priv *)hi->dev->priv;
 369         list_add_tail(&new_node->list, &priv->ip_node_list);
 370
 371         return 0;
 372 }
 373
 374 static int eth1394_remove(struct device *dev)
 375 {
 376         struct unit_directory *ud;
 377         struct eth1394_host_info *hi;
 378         struct eth1394_priv *priv;
 379         struct eth1394_node_ref *old_node;
 380         struct eth1394_node_info *node_info;
 381         struct list_head *lh, *n;
 382         unsigned long flags;
 383
 384         ud = container_of(dev, struct unit_directory, device);
 385         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 386         if (!hi)
 387                 return -ENOENT;
 388
 389         priv = (struct eth1394_priv *)hi->dev->priv;
 390
 391         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 392
 393         if (old_node) {
 394                 list_del(&old_node->list);
 395                 kfree(old_node);
 396
 397                 node_info = (struct eth1394_node_info*)ud->device.driver_data;
 398
 399                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 400                 /* The partial datagram list should be empty, but we'll just
 401                  * make sure anyway... */
 402                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 403                         purge_partial_datagram(lh);
 404                 }
 405                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 406
 407                 kfree(node_info);
 408                 ud->device.driver_data = NULL;
 409         }
 410         return 0;
 411 }
 412
 413 static int eth1394_update(struct unit_directory *ud)
 414 {
 415         struct eth1394_host_info *hi;
 416         struct eth1394_priv *priv;
 417         struct eth1394_node_ref *node;
 418         struct eth1394_node_info *node_info;
 419
 420         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 421         if (!hi)
 422                 return -ENOENT;
 423
 424         priv = (struct eth1394_priv *)hi->dev->priv;
 425
 426         node = eth1394_find_node(&priv->ip_node_list, ud);
 427
 428         if (!node) {
 429                 node = kmalloc(sizeof(struct eth1394_node_ref),
 430                                in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 431                 if (!node)
 432                         return -ENOMEM;
 433
 434                 node_info = kmalloc(sizeof(struct eth1394_node_info),
 435                                     in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 436                 if (!node_info) {
 437                         kfree(node);
 438                         return -ENOMEM;
 439                 }
 440
 441                 spin_lock_init(&node_info->pdg.lock);
 442                 INIT_LIST_HEAD(&node_info->pdg.list);
 443                 node_info->pdg.sz = 0;
 444
 445                 ud->device.driver_data = node_info;
 446                 node->ud = ud;
 447
 448                 priv = (struct eth1394_priv *)hi->dev->priv;
 449                 list_add_tail(&node->list, &priv->ip_node_list);
 450         }
 451
 452         return 0;
 453 }
 454
 455
 456 static struct ieee1394_device_id eth1394_id_table[] = {
 457         {
 458                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 459                                 IEEE1394_MATCH_VERSION),
 460                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 461                 .version = ETHER1394_GASP_VERSION,
 462         },
 463         {}
 464 };
 465
 466 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 467
 468 static struct hpsb_protocol_driver eth1394_proto_driver = {
 469         .name           = "IPv4 over 1394 Driver",
 470         .id_table       = eth1394_id_table,
 471         .update         = eth1394_update,
 472         .driver         = {
 473                 .name           = ETH1394_DRIVER_NAME,
 474                 .bus            = &ieee1394_bus_type,
 475                 .probe          = eth1394_probe,
 476                 .remove         = eth1394_remove,
 477         },
 478 };
 479
 480
 481 static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
 482 {
 483         unsigned long flags;
 484         int i;
 485         struct eth1394_priv *priv = dev->priv;
 486         struct hpsb_host *host = priv->host;
 487         u64 guid = *((u64*)&(host->csr.rom->bus_info_data[3]));
 488         u16 maxpayload = 1 << (host->csr.max_rec + 1);
 489         int max_speed = IEEE1394_SPEED_MAX;
 490
 491         spin_lock_irqsave (&priv->lock, flags);
 492
 493         memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
 494         priv->bc_maxpayload = 512;
 495
 496         /* Determine speed limit */
 497         for (i = 0; i < host->node_count; i++)
 498                 if (max_speed > host->speed_map[NODEID_TO_NODE(host->node_id) *
 499                                                 64 + i])
 500                         max_speed = host->speed_map[NODEID_TO_NODE(host->node_id) *
 501                                                     64 + i];
 502         priv->bc_sspd = max_speed;
 503
 504         /* We'll use our maxpayload as the default mtu */
 505         if (set_mtu) {
 506                 dev->mtu = min(ETH1394_DATA_LEN,
 507                                (int)(maxpayload -
 508                                      (sizeof(union eth1394_hdr) +
 509                                       ETHER1394_GASP_OVERHEAD)));
 510
 511                 /* Set our hardware address while we're at it */
 512                 *(u64*)dev->dev_addr = guid;
 513                 *(u64*)dev->broadcast = ~0x0ULL;
 514         }
 515
 516         spin_unlock_irqrestore (&priv->lock, flags);
 517 }
 518
 519 /* This function is called right before register_netdev */
 520 static void ether1394_init_dev (struct net_device *dev)
 521 {
 522         /* Our functions */
 523         dev->open               = ether1394_open;
 524         dev->stop               = ether1394_stop;
 525         dev->hard_start_xmit    = ether1394_tx;
 526         dev->get_stats          = ether1394_stats;
 527         dev->tx_timeout         = ether1394_tx_timeout;
 528         dev->change_mtu         = ether1394_change_mtu;
 529
 530         dev->hard_header        = ether1394_header;
 531         dev->rebuild_header     = ether1394_rebuild_header;
 532         dev->hard_header_cache  = ether1394_header_cache;
 533         dev->header_cache_update= ether1394_header_cache_update;
 534         dev->hard_header_parse  = ether1394_header_parse;
 535         dev->set_mac_address    = ether1394_mac_addr;
 536         dev->do_ioctl           = ether1394_do_ioctl;
 537
 538         /* Some constants */
 539         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 540         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 541         dev->features           = NETIF_F_HIGHDMA;
 542         dev->addr_len           = ETH1394_ALEN;
 543         dev->hard_header_len    = ETH1394_HLEN;
 544         dev->type               = ARPHRD_IEEE1394;
 545
 546         ether1394_reset_priv (dev, 1);
 547 }
 548
 549 /*
 550  * This function is called every time a card is found. It is generally called
 551  * when the module is installed. This is where we add all of our ethernet
 552  * devices. One for each host.
 553  */
 554 static void ether1394_add_host (struct hpsb_host *host)
 555 {
 556         struct eth1394_host_info *hi = NULL;
 557         struct net_device *dev = NULL;
 558         struct eth1394_priv *priv;
 559         static int version_printed = 0;
 560         u64 fifo_addr;
 561
 562         if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
 563                 return;
 564
 565         fifo_addr = hpsb_allocate_and_register_addrspace(&eth1394_highlevel,
 566                                                          host,
 567                                                          &addr_ops,
 568                                                          ETHER1394_REGION_ADDR_LEN,
 569                                                          ETHER1394_REGION_ADDR_LEN,
 570                                                          -1, -1);
 571         if (fifo_addr == ~0ULL)
 572                 goto out;
 573
 574         if (version_printed++ == 0)
 575                 ETH1394_PRINT_G (KERN_INFO, "%s\n", version);
 576
 577         /* We should really have our own alloc_hpsbdev() function in
 578          * net_init.c instead of calling the one for ethernet then hijacking
 579          * it for ourselves.  That way we'd be a real networking device. */
 580         dev = alloc_etherdev(sizeof (struct eth1394_priv));
 581
 582         if (dev == NULL) {
 583                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
 584                                  "etherdevice for IEEE 1394 device %s-%d\n",
 585                                  host->driver->name, host->id);
 586                 goto out;
 587         }
 588
 589         SET_MODULE_OWNER(dev);
 590
 591         priv = (struct eth1394_priv *)dev->priv;
 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_ERR, 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, (ETHER1394_GASP_BUFFERS * 2 *
 626                                               (1 << (host->csr.max_rec + 1))),
 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 = (struct eth1394_priv *)hi->dev->priv;
 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 *)dev->priv;
 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                               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 == __constant_htons(ETH_P_802_3)) {
 796                 return -1;
 797         }
 798
 799         eth->h_proto = type;
 800         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 801
 802         hh->hh_len = ETH1394_HLEN;
 803         return 0;
 804 }
 805
 806 /* Called by Address Resolution module to notify changes in address. */
 807 static void ether1394_header_cache_update(struct hh_cache *hh,
 808                                           struct net_device *dev,
 809                                           unsigned char * haddr)
 810 {
 811         memcpy(((u8*)hh->hh_data) + (16 - ETH1394_HLEN), haddr, dev->addr_len);
 812 }
 813
 814 static int ether1394_mac_addr(struct net_device *dev, void *p)
 815 {
 816         if (netif_running(dev))
 817                 return -EBUSY;
 818
 819         /* Not going to allow setting the MAC address, we really need to use
 820          * the real one supplied by the hardware */
 821          return -EINVAL;
 822  }
 823
 824
 825
 826 /******************************************
 827  * Datagram reception code
 828  ******************************************/
 829
 830 /* Copied from net/ethernet/eth.c */
 831 static inline u16 ether1394_type_trans(struct sk_buff *skb,
 832                                        struct net_device *dev)
 833 {
 834         struct eth1394hdr *eth;
 835         unsigned char *rawp;
 836
 837         skb->mac.raw = skb->data;
 838         skb_pull (skb, ETH1394_HLEN);
 839         eth = (struct eth1394hdr*)skb->mac.raw;
 840
 841         if (*eth->h_dest & 1) {
 842                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
 843                         skb->pkt_type = PACKET_BROADCAST;
 844 #if 0
 845                 else
 846                         skb->pkt_type = PACKET_MULTICAST;
 847 #endif
 848         } else {
 849                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 850                         skb->pkt_type = PACKET_OTHERHOST;
 851         }
 852
 853         if (ntohs (eth->h_proto) >= 1536)
 854                 return eth->h_proto;
 855
 856         rawp = skb->data;
 857
 858         if (*(unsigned short *)rawp == 0xFFFF)
 859                 return htons (ETH_P_802_3);
 860
 861         return htons (ETH_P_802_2);
 862 }
 863
 864 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 865  * We also perform ARP translation here, if need be.  */
 866 static inline u16 ether1394_parse_encap(struct sk_buff *skb,
 867                                         struct net_device *dev,
 868                                         nodeid_t srcid, nodeid_t destid,
 869                                         u16 ether_type)
 870 {
 871         struct eth1394_priv *priv = dev->priv;
 872         u64 dest_hw;
 873         unsigned short ret = 0;
 874
 875         /* Setup our hw addresses. We use these to build the
 876          * ethernet header.  */
 877         if (destid == (LOCAL_BUS | ALL_NODES))
 878                 dest_hw = ~0ULL;  /* broadcast */
 879         else
 880                 dest_hw = cpu_to_be64((((u64)priv->host->csr.guid_hi) << 32) |
 881                                       priv->host->csr.guid_lo);
 882
 883         /* If this is an ARP packet, convert it. First, we want to make
 884          * use of some of the fields, since they tell us a little bit
 885          * about the sending machine.  */
 886         if (ether_type == __constant_htons (ETH_P_ARP)) {
 887                 struct eth1394_arp *arp1394 = (struct eth1394_arp*)skb->data;
 888                 struct arphdr *arp = (struct arphdr *)skb->data;
 889                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 890                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 891                         ntohl(arp1394->fifo_lo);
 892                 u8 max_rec = min(priv->host->csr.max_rec,
 893                                  (u8)(arp1394->max_rec));
 894                 int sspd = arp1394->sspd;
 895                 u16 maxpayload;
 896                 struct eth1394_node_ref *node;
 897                 struct eth1394_node_info *node_info;
 898
 899                 /* Sanity check. MacOSX seems to be sending us 131 in this
 900                  * field (atleast on my Panther G5). Not sure why. */
 901                 if (sspd > 5 || sspd < 0)
 902                         sspd = 0;
 903
 904                 maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
 905
 906                 node = eth1394_find_node_guid(&priv->ip_node_list,
 907                                               be64_to_cpu(arp1394->s_uniq_id));
 908                 if (!node) {
 909                         return 0;
 910                 }
 911
 912                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 913
 914                 /* Update our speed/payload/fifo_offset table */
 915                 node_info->maxpayload = maxpayload;
 916                 node_info->sspd =       sspd;
 917                 node_info->fifo =       fifo_addr;
 918
 919                 /* Now that we're done with the 1394 specific stuff, we'll
 920                  * need to alter some of the data.  Believe it or not, all
 921                  * that needs to be done is sender_IP_address needs to be
 922                  * moved, the destination hardware address get stuffed
 923                  * in and the hardware address length set to 8.
 924                  *
 925                  * IMPORTANT: The code below overwrites 1394 specific data
 926                  * needed above so keep the munging of the data for the
 927                  * higher level IP stack last. */
 928
 929                 arp->ar_hln = 8;
 930                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 931                 *(u32*)arp_ptr = arp1394->sip;  /* move sender IP addr */
 932                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 933
 934                 if (arp->ar_op == 1)
 935                         /* just set ARP req target unique ID to 0 */
 936                         *((u64*)arp_ptr) = 0;
 937                 else
 938                         *((u64*)arp_ptr) = *((u64*)dev->dev_addr);
 939         }
 940
 941         /* Now add the ethernet header. */
 942         if (dev->hard_header (skb, dev, __constant_ntohs (ether_type),
 943                               &dest_hw, NULL, skb->len) >= 0)
 944                 ret = ether1394_type_trans(skb, dev);
 945
 946         return ret;
 947 }
 948
 949 static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
 950 {
 951         struct fragment_info *fi;
 952
 953         list_for_each_entry(fi, frag_list, list) {
 954                 if ( ! ((offset > (fi->offset + fi->len - 1)) ||
 955                        ((offset + len - 1) < fi->offset)))
 956                         return 1;
 957         }
 958         return 0;
 959 }
 960
 961 static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 962 {
 963         struct partial_datagram *pd;
 964
 965         list_for_each_entry(pd, pdgl, list) {
 966                 if (pd->dgl == dgl)
 967                         return &pd->list;
 968         }
 969         return NULL;
 970 }
 971
 972 /* Assumes that new fragment does not overlap any existing fragments */
 973 static inline int new_fragment(struct list_head *frag_info, int offset, int len)
 974 {
 975         struct list_head *lh;
 976         struct fragment_info *fi, *fi2, *new;
 977
 978         list_for_each(lh, frag_info) {
 979                 fi = list_entry(lh, struct fragment_info, list);
 980                 if ((fi->offset + fi->len) == offset) {
 981                         /* The new fragment can be tacked on to the end */
 982                         fi->len += len;
 983                         /* Did the new fragment plug a hole? */
 984                         fi2 = list_entry(lh->next, struct fragment_info, list);
 985                         if ((fi->offset + fi->len) == fi2->offset) {
 986                                 /* glue fragments together */
 987                                 fi->len += fi2->len;
 988                                 list_del(lh->next);
 989                                 kfree(fi2);
 990                         }
 991                         return 0;
 992                 } else if ((offset + len) == fi->offset) {
 993                         /* The new fragment can be tacked on to the beginning */
 994                         fi->offset = offset;
 995                         fi->len += len;
 996                         /* Did the new fragment plug a hole? */
 997                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 998                         if ((fi2->offset + fi2->len) == fi->offset) {
 999                                 /* glue fragments together */
1000                                 fi2->len += fi->len;
1001                                 list_del(lh);
1002                                 kfree(fi);
1003                         }
1004                         return 0;
1005                 } else if (offset > (fi->offset + fi->len)) {
1006                         break;
1007                 } else if ((offset + len) < fi->offset) {
1008                         lh = lh->prev;
1009                         break;
1010                 }
1011         }
1012
1013         new = kmalloc(sizeof(struct fragment_info), GFP_ATOMIC);
1014         if (!new)
1015                 return -ENOMEM;
1016
1017         new->offset = offset;
1018         new->len = len;
1019
1020         list_add(&new->list, lh);
1021
1022         return 0;
1023 }
1024
1025 static inline int new_partial_datagram(struct net_device *dev,
1026                                        struct list_head *pdgl, int dgl,
1027                                        int dg_size, char *frag_buf,
1028                                        int frag_off, int frag_len)
1029 {
1030         struct partial_datagram *new;
1031
1032         new = kmalloc(sizeof(struct partial_datagram), GFP_ATOMIC);
1033         if (!new)
1034                 return -ENOMEM;
1035
1036         INIT_LIST_HEAD(&new->frag_info);
1037
1038         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1039                 kfree(new);
1040                 return -ENOMEM;
1041         }
1042
1043         new->dgl = dgl;
1044         new->dg_size = dg_size;
1045
1046         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1047         if (!new->skb) {
1048                 struct fragment_info *fi = list_entry(new->frag_info.next,
1049                                                       struct fragment_info,
1050                                                       list);
1051                 kfree(fi);
1052                 kfree(new);
1053                 return -ENOMEM;
1054         }
1055
1056         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1057         new->pbuf = skb_put(new->skb, dg_size);
1058         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1059
1060         list_add(&new->list, pdgl);
1061
1062         return 0;
1063 }
1064
1065 static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1066                                           char *frag_buf, int frag_off, int frag_len)
1067 {
1068         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1069
1070         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
1071                 return -ENOMEM;
1072         }
1073
1074         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1075
1076         /* Move list entry to beginnig of list so that oldest partial
1077          * datagrams percolate to the end of the list */
1078         list_del(lh);
1079         list_add(lh, pdgl);
1080
1081         return 0;
1082 }
1083
1084 static inline void purge_partial_datagram(struct list_head *old)
1085 {
1086         struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
1087         struct list_head *lh, *n;
1088
1089         list_for_each_safe(lh, n, &pd->frag_info) {
1090                 struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
1091                 list_del(lh);
1092                 kfree(fi);
1093         }
1094         list_del(old);
1095         kfree_skb(pd->skb);
1096         kfree(pd);
1097 }
1098
1099 static inline int is_datagram_complete(struct list_head *lh, int dg_size)
1100 {
1101         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1102         struct fragment_info *fi = list_entry(pd->frag_info.next,
1103                                               struct fragment_info, list);
1104
1105         return (fi->len == dg_size);
1106 }
1107
1108 /* Packet reception. We convert the IP1394 encapsulation header to an
1109  * ethernet header, and fill it with some of our other fields. This is
1110  * an incoming packet from the 1394 bus.  */
1111 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1112                                   char *buf, int len)
1113 {
1114         struct sk_buff *skb;
1115         unsigned long flags;
1116         struct eth1394_priv *priv = (struct eth1394_priv *)dev->priv;
1117         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1118         u16 ether_type = 0;  /* initialized to clear warning */
1119         int hdr_len;
1120         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1121         struct eth1394_node_info *node_info;
1122
1123         if (!ud) {
1124                 struct eth1394_node_ref *node;
1125                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1126                 if (!node) {
1127                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1128                                    "lookup failure: " NODE_BUS_FMT,
1129                                    NODE_BUS_ARGS(priv->host, srcid));
1130                         priv->stats.rx_dropped++;
1131                         return -1;
1132                 }
1133                 ud = node->ud;
1134
1135                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1136         }
1137
1138         node_info = (struct eth1394_node_info*)ud->device.driver_data;
1139
1140         /* First, did we receive a fragmented or unfragmented datagram? */
1141         hdr->words.word1 = ntohs(hdr->words.word1);
1142
1143         hdr_len = hdr_type_len[hdr->common.lf];
1144
1145         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1146                 /* An unfragmented datagram has been received by the ieee1394
1147                  * bus. Build an skbuff around it so we can pass it to the
1148                  * high level network layer. */
1149
1150                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1151                 if (!skb) {
1152                         HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
1153                         priv->stats.rx_dropped++;
1154                         return -1;
1155                 }
1156                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1157                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
1158                 ether_type = hdr->uf.ether_type;
1159         } else {
1160                 /* A datagram fragment has been received, now the fun begins. */
1161
1162                 struct list_head *pdgl, *lh;
1163                 struct partial_datagram *pd;
1164                 int fg_off;
1165                 int fg_len = len - hdr_len;
1166                 int dg_size;
1167                 int dgl;
1168                 int retval;
1169                 struct pdg_list *pdg = &(node_info->pdg);
1170
1171                 hdr->words.word3 = ntohs(hdr->words.word3);
1172                 /* The 4th header word is reserved so no need to do ntohs() */
1173
1174                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1175                         ether_type = hdr->ff.ether_type;
1176                         dgl = hdr->ff.dgl;
1177                         dg_size = hdr->ff.dg_size + 1;
1178                         fg_off = 0;
1179                 } else {
1180                         hdr->words.word2 = ntohs(hdr->words.word2);
1181                         dgl = hdr->sf.dgl;
1182                         dg_size = hdr->sf.dg_size + 1;
1183                         fg_off = hdr->sf.fg_off;
1184                 }
1185                 spin_lock_irqsave(&pdg->lock, flags);
1186
1187                 pdgl = &(pdg->list);
1188                 lh = find_partial_datagram(pdgl, dgl);
1189
1190                 if (lh == NULL) {
1191                         if (pdg->sz == max_partial_datagrams) {
1192                                 /* remove the oldest */
1193                                 purge_partial_datagram(pdgl->prev);
1194                                 pdg->sz--;
1195                         }
1196
1197                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1198                                                       buf + hdr_len, fg_off,
1199                                                       fg_len);
1200                         if (retval < 0) {
1201                                 spin_unlock_irqrestore(&pdg->lock, flags);
1202                                 goto bad_proto;
1203                         }
1204                         pdg->sz++;
1205                         lh = find_partial_datagram(pdgl, dgl);
1206                 } else {
1207                         struct partial_datagram *pd;
1208
1209                         pd = list_entry(lh, struct partial_datagram, list);
1210
1211                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1212                                 /* Overlapping fragments, obliterate old
1213                                  * datagram and start new one. */
1214                                 purge_partial_datagram(lh);
1215                                 retval = new_partial_datagram(dev, pdgl, dgl,
1216                                                               dg_size,
1217                                                               buf + hdr_len,
1218                                                               fg_off, fg_len);
1219                                 if (retval < 0) {
1220                                         pdg->sz--;
1221                                         spin_unlock_irqrestore(&pdg->lock, flags);
1222                                         goto bad_proto;
1223                                 }
1224                         } else {
1225                                 retval = update_partial_datagram(pdgl, lh,
1226                                                                  buf + hdr_len,
1227                                                                  fg_off, fg_len);
1228                                 if (retval < 0) {
1229                                         /* Couldn't save off fragment anyway
1230                                          * so might as well obliterate the
1231                                          * datagram now. */
1232                                         purge_partial_datagram(lh);
1233                                         pdg->sz--;
1234                                         spin_unlock_irqrestore(&pdg->lock, flags);
1235                                         goto bad_proto;
1236                                 }
1237                         } /* fragment overlap */
1238                 } /* new datagram or add to existing one */
1239
1240                 pd = list_entry(lh, struct partial_datagram, list);
1241
1242                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1243                         pd->ether_type = ether_type;
1244                 }
1245
1246                 if (is_datagram_complete(lh, dg_size)) {
1247                         ether_type = pd->ether_type;
1248                         pdg->sz--;
1249                         skb = skb_get(pd->skb);
1250                         purge_partial_datagram(lh);
1251                         spin_unlock_irqrestore(&pdg->lock, flags);
1252                 } else {
1253                         /* Datagram is not complete, we're done for the
1254                          * moment. */
1255                         spin_unlock_irqrestore(&pdg->lock, flags);
1256                         return 0;
1257                 }
1258         } /* unframgented datagram or fragmented one */
1259
1260         /* Write metadata, and then pass to the receive level */
1261         skb->dev = dev;
1262         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1263
1264         /* Parse the encapsulation header. This actually does the job of
1265          * converting to an ethernet frame header, aswell as arp
1266          * conversion if needed. ARP conversion is easier in this
1267          * direction, since we are using ethernet as our backend.  */
1268         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1269                                               ether_type);
1270
1271
1272         spin_lock_irqsave(&priv->lock, flags);
1273         if (!skb->protocol) {
1274                 priv->stats.rx_errors++;
1275                 priv->stats.rx_dropped++;
1276                 dev_kfree_skb_any(skb);
1277                 goto bad_proto;
1278         }
1279
1280         if (netif_rx(skb) == NET_RX_DROP) {
1281                 priv->stats.rx_errors++;
1282                 priv->stats.rx_dropped++;
1283                 goto bad_proto;
1284         }
1285
1286         /* Statistics */
1287         priv->stats.rx_packets++;
1288         priv->stats.rx_bytes += skb->len;
1289
1290 bad_proto:
1291         if (netif_queue_stopped(dev))
1292                 netif_wake_queue(dev);
1293         spin_unlock_irqrestore(&priv->lock, flags);
1294
1295         dev->last_rx = jiffies;
1296
1297         return 0;
1298 }
1299
1300 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1301                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1302 {
1303         struct eth1394_host_info *hi;
1304
1305         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1306         if (hi == NULL) {
1307                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1308                                 host->driver->name);
1309                 return RCODE_ADDRESS_ERROR;
1310         }
1311
1312         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1313                 return RCODE_ADDRESS_ERROR;
1314         else
1315                 return RCODE_COMPLETE;
1316 }
1317
1318 static void ether1394_iso(struct hpsb_iso *iso)
1319 {
1320         quadlet_t *data;
1321         char *buf;
1322         struct eth1394_host_info *hi;
1323         struct net_device *dev;
1324         struct eth1394_priv *priv;
1325         unsigned int len;
1326         u32 specifier_id;
1327         u16 source_id;
1328         int i;
1329         int nready;
1330
1331         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1332         if (hi == NULL) {
1333                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1334                                 iso->host->driver->name);
1335                 return;
1336         }
1337
1338         dev = hi->dev;
1339
1340         nready = hpsb_iso_n_ready(iso);
1341         for (i = 0; i < nready; i++) {
1342                 struct hpsb_iso_packet_info *info =
1343                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1344                 data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
1345
1346                 /* skip over GASP header */
1347                 buf = (char *)data + 8;
1348                 len = info->len - 8;
1349
1350                 specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
1351                                 ((be32_to_cpu(data[1]) & 0xff000000) >> 24));
1352                 source_id = be32_to_cpu(data[0]) >> 16;
1353
1354                 priv = (struct eth1394_priv *)dev->priv;
1355
1356                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
1357                    specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1358                         /* This packet is not for us */
1359                         continue;
1360                 }
1361                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1362                                        buf, len);
1363         }
1364
1365         hpsb_iso_recv_release_packets(iso, i);
1366
1367         dev->last_rx = jiffies;
1368 }
1369
1370 /******************************************
1371  * Datagram transmission code
1372  ******************************************/
1373
1374 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1375  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1376  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1377  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1378  * judge.
1379  *
1380  * Now that the EUI is used for the hardware address all we need to do to make
1381  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1382  * speed, and unicast FIFO address information between the sender_unique_id
1383  * and the IP addresses.
1384  */
1385 static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
1386                                             struct net_device *dev)
1387 {
1388         struct eth1394_priv *priv = (struct eth1394_priv *)(dev->priv);
1389
1390         struct arphdr *arp = (struct arphdr *)skb->data;
1391         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1392         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1393
1394         /* Believe it or not, all that need to happen is sender IP get moved
1395          * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
1396         arp1394->hw_addr_len    = 16;
1397         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1398         arp1394->max_rec        = priv->host->csr.max_rec;
1399         arp1394->sspd           = priv->host->csr.lnk_spd;
1400         arp1394->fifo_hi        = htons (priv->local_fifo >> 32);
1401         arp1394->fifo_lo        = htonl (priv->local_fifo & ~0x0);
1402
1403         return;
1404 }
1405
1406 /* We need to encapsulate the standard header with our own. We use the
1407  * ethernet header's proto for our own. */
1408 static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1409                                                       int proto,
1410                                                       union eth1394_hdr *hdr,
1411                                                       u16 dg_size, u16 dgl)
1412 {
1413         unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1414
1415         /* Does it all fit in one packet? */
1416         if (dg_size <= adj_max_payload) {
1417                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1418                 hdr->uf.ether_type = proto;
1419         } else {
1420                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1421                 hdr->ff.ether_type = proto;
1422                 hdr->ff.dg_size = dg_size - 1;
1423                 hdr->ff.dgl = dgl;
1424                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1425         }
1426         return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
1427 }
1428
1429 static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
1430                                                  unsigned int max_payload,
1431                                                  union eth1394_hdr *hdr)
1432 {
1433         union eth1394_hdr *bufhdr;
1434         int ftype = hdr->common.lf;
1435         int hdrsz = hdr_type_len[ftype];
1436         unsigned int adj_max_payload = max_payload - hdrsz;
1437
1438         switch(ftype) {
1439         case ETH1394_HDR_LF_UF:
1440                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1441                 bufhdr->words.word1 = htons(hdr->words.word1);
1442                 bufhdr->words.word2 = hdr->words.word2;
1443                 break;
1444
1445         case ETH1394_HDR_LF_FF:
1446                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1447                 bufhdr->words.word1 = htons(hdr->words.word1);
1448                 bufhdr->words.word2 = hdr->words.word2;
1449                 bufhdr->words.word3 = htons(hdr->words.word3);
1450                 bufhdr->words.word4 = 0;
1451
1452                 /* Set frag type here for future interior fragments */
1453                 hdr->common.lf = ETH1394_HDR_LF_IF;
1454                 hdr->sf.fg_off = 0;
1455                 break;
1456
1457         default:
1458                 hdr->sf.fg_off += adj_max_payload;
1459                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1460                 if (max_payload >= skb->len)
1461                         hdr->common.lf = ETH1394_HDR_LF_LF;
1462                 bufhdr->words.word1 = htons(hdr->words.word1);
1463                 bufhdr->words.word2 = htons(hdr->words.word2);
1464                 bufhdr->words.word3 = htons(hdr->words.word3);
1465                 bufhdr->words.word4 = 0;
1466         }
1467
1468         return min(max_payload, skb->len);
1469 }
1470
1471 static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1472 {
1473         struct hpsb_packet *p;
1474
1475         p = hpsb_alloc_packet(0);
1476         if (p) {
1477                 p->host = host;
1478                 p->generation = get_hpsb_generation(host);
1479                 p->type = hpsb_async;
1480         }
1481         return p;
1482 }
1483
1484 static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
1485                                               struct hpsb_host *host,
1486                                               nodeid_t node, u64 addr,
1487                                               void * data, int tx_len)
1488 {
1489         p->node_id = node;
1490         p->data = NULL;
1491
1492         p->tcode = TCODE_WRITEB;
1493         p->header[1] = (host->node_id << 16) | (addr >> 32);
1494         p->header[2] = addr & 0xffffffff;
1495
1496         p->header_size = 16;
1497         p->expect_response = 1;
1498
1499         if (hpsb_get_tlabel(p)) {
1500                 ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
1501                                 "to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
1502                 return -1;
1503         }
1504         p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
1505                 | (1 << 8) | (TCODE_WRITEB << 4);
1506
1507         p->header[3] = tx_len << 16;
1508         p->data_size = (tx_len + 3) & ~3;
1509         p->data = (quadlet_t*)data;
1510
1511         return 0;
1512 }
1513
1514 static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1515                                               struct eth1394_priv *priv,
1516                                               struct sk_buff *skb, int length)
1517 {
1518         p->header_size = 4;
1519         p->tcode = TCODE_STREAM_DATA;
1520
1521         p->header[0] = (length << 16) | (3 << 14)
1522                 | ((priv->broadcast_channel) << 8)
1523                 | (TCODE_STREAM_DATA << 4);
1524         p->data_size = length;
1525         p->data = ((quadlet_t*)skb->data) - 2;
1526         p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
1527                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1528         p->data[1] = __constant_cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
1529                                             ETHER1394_GASP_VERSION);
1530
1531         /* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
1532          * prevents hpsb_send_packet() from setting the speed to an arbitrary
1533          * value based on packet->node_id if packet->node_id is not set. */
1534         p->node_id = ALL_NODES;
1535         p->speed_code = priv->bc_sspd;
1536 }
1537
1538 static inline void ether1394_free_packet(struct hpsb_packet *packet)
1539 {
1540         if (packet->tcode != TCODE_STREAM_DATA)
1541                 hpsb_free_tlabel(packet);
1542         hpsb_free_packet(packet);
1543 }
1544
1545 static void ether1394_complete_cb(void *__ptask);
1546
1547 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1548 {
1549         struct eth1394_priv *priv = ptask->priv;
1550         struct hpsb_packet *packet = NULL;
1551
1552         packet = ether1394_alloc_common_packet(priv->host);
1553         if (!packet)
1554                 return -1;
1555
1556         if (ptask->tx_type == ETH1394_GASP) {
1557                 int length = tx_len + (2 * sizeof(quadlet_t));
1558
1559                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1560         } else if (ether1394_prep_write_packet(packet, priv->host,
1561                                                ptask->dest_node,
1562                                                ptask->addr, ptask->skb->data,
1563                                                tx_len)) {
1564                 hpsb_free_packet(packet);
1565                 return -1;
1566         }
1567
1568         ptask->packet = packet;
1569         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1570                                       ptask);
1571
1572         if (hpsb_send_packet(packet) < 0) {
1573                 ether1394_free_packet(packet);
1574                 return -1;
1575         }
1576
1577         return 0;
1578 }
1579
1580
1581 /* Task function to be run when a datagram transmission is completed */
1582 static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
1583 {
1584         struct sk_buff *skb = ptask->skb;
1585         struct net_device *dev = skb->dev;
1586         struct eth1394_priv *priv = dev->priv;
1587         unsigned long flags;
1588
1589         /* Statistics */
1590         spin_lock_irqsave(&priv->lock, flags);
1591         if (fail) {
1592                 priv->stats.tx_dropped++;
1593                 priv->stats.tx_errors++;
1594         } else {
1595                 priv->stats.tx_bytes += skb->len;
1596                 priv->stats.tx_packets++;
1597         }
1598         spin_unlock_irqrestore(&priv->lock, flags);
1599
1600         dev_kfree_skb_any(skb);
1601         kmem_cache_free(packet_task_cache, ptask);
1602 }
1603
1604
1605 /* Callback for when a packet has been sent and the status of that packet is
1606  * known */
1607 static void ether1394_complete_cb(void *__ptask)
1608 {
1609         struct packet_task *ptask = (struct packet_task *)__ptask;
1610         struct hpsb_packet *packet = ptask->packet;
1611         int fail = 0;
1612
1613         if (packet->tcode != TCODE_STREAM_DATA)
1614                 fail = hpsb_packet_success(packet);
1615
1616         ether1394_free_packet(packet);
1617
1618         ptask->outstanding_pkts--;
1619         if (ptask->outstanding_pkts > 0 && !fail) {
1620                 int tx_len;
1621
1622                 /* Add the encapsulation header to the fragment */
1623                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1624                                                &ptask->hdr);
1625                 if (ether1394_send_packet(ptask, tx_len))
1626                         ether1394_dg_complete(ptask, 1);
1627         } else {
1628                 ether1394_dg_complete(ptask, fail);
1629         }
1630 }
1631
1632
1633
1634 /* Transmit a packet (called by kernel) */
1635 static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
1636 {
1637         int kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
1638         struct eth1394hdr *eth;
1639         struct eth1394_priv *priv = dev->priv;
1640         int proto;
1641         unsigned long flags;
1642         nodeid_t dest_node;
1643         eth1394_tx_type tx_type;
1644         int ret = 0;
1645         unsigned int tx_len;
1646         unsigned int max_payload;
1647         u16 dg_size;
1648         u16 dgl;
1649         struct packet_task *ptask;
1650         struct eth1394_node_ref *node;
1651         struct eth1394_node_info *node_info = NULL;
1652
1653         ptask = kmem_cache_alloc(packet_task_cache, kmflags);
1654         if (ptask == NULL) {
1655                 ret = -ENOMEM;
1656                 goto fail;
1657         }
1658
1659         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1660          * it does not set our validity bit. We need to compensate for
1661          * that somewhere else, but not in eth1394. */
1662 #if 0
1663         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
1664                 ret = -EAGAIN;
1665                 goto fail;
1666         }
1667 #endif
1668
1669         if ((skb = skb_share_check (skb, kmflags)) == NULL) {
1670                 ret = -ENOMEM;
1671                 goto fail;
1672         }
1673
1674         /* Get rid of the fake eth1394 header, but save a pointer */
1675         eth = (struct eth1394hdr*)skb->data;
1676         skb_pull(skb, ETH1394_HLEN);
1677
1678         proto = eth->h_proto;
1679         dg_size = skb->len;
1680
1681         /* Set the transmission type for the packet.  ARP packets and IP
1682          * broadcast packets are sent via GASP. */
1683         if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1684             proto == __constant_htons(ETH_P_ARP) ||
1685             (proto == __constant_htons(ETH_P_IP) &&
1686              IN_MULTICAST(__constant_ntohl(skb->nh.iph->daddr)))) {
1687                 tx_type = ETH1394_GASP;
1688                 dest_node = LOCAL_BUS | ALL_NODES;
1689                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1690                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1691                 dgl = priv->bc_dgl;
1692                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1693                         priv->bc_dgl++;
1694         } else {
1695                 node = eth1394_find_node_guid(&priv->ip_node_list,
1696                                               be64_to_cpu(*(u64*)eth->h_dest));
1697                 if (!node) {
1698                         ret = -EAGAIN;
1699                         goto fail;
1700                 }
1701                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
1702                 if (node_info->fifo == ETHER1394_INVALID_ADDR) {
1703                         ret = -EAGAIN;
1704                         goto fail;
1705                 }
1706
1707                 dest_node = node->ud->ne->nodeid;
1708                 max_payload = node_info->maxpayload;
1709                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1710
1711                 dgl = node_info->dgl;
1712                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1713                         node_info->dgl++;
1714                 tx_type = ETH1394_WRREQ;
1715         }
1716
1717         /* If this is an ARP packet, convert it */
1718         if (proto == __constant_htons (ETH_P_ARP))
1719                 ether1394_arp_to_1394arp (skb, dev);
1720
1721         ptask->hdr.words.word1 = 0;
1722         ptask->hdr.words.word2 = 0;
1723         ptask->hdr.words.word3 = 0;
1724         ptask->hdr.words.word4 = 0;
1725         ptask->skb = skb;
1726         ptask->priv = priv;
1727         ptask->tx_type = tx_type;
1728
1729         if (tx_type != ETH1394_GASP) {
1730                 u64 addr;
1731
1732                 spin_lock_irqsave(&priv->lock, flags);
1733                 addr = node_info->fifo;
1734                 spin_unlock_irqrestore(&priv->lock, flags);
1735
1736                 ptask->addr = addr;
1737                 ptask->dest_node = dest_node;
1738         }
1739
1740         ptask->tx_type = tx_type;
1741         ptask->max_payload = max_payload;
1742         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
1743                                                              &ptask->hdr, dg_size,
1744                                                              dgl);
1745
1746         /* Add the encapsulation header to the fragment */
1747         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1748         dev->trans_start = jiffies;
1749         if (ether1394_send_packet(ptask, tx_len))
1750                 goto fail;
1751
1752         netif_wake_queue(dev);
1753         return 0;
1754 fail:
1755         if (ptask)
1756                 kmem_cache_free(packet_task_cache, ptask);
1757
1758         if (skb != NULL)
1759                 dev_kfree_skb(skb);
1760
1761         spin_lock_irqsave (&priv->lock, flags);
1762         priv->stats.tx_dropped++;
1763         priv->stats.tx_errors++;
1764         spin_unlock_irqrestore (&priv->lock, flags);
1765
1766         if (netif_queue_stopped(dev))
1767                 netif_wake_queue(dev);
1768
1769         return 0;  /* returning non-zero causes serious problems */
1770 }
1771
1772 static int ether1394_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1773 {
1774         switch(cmd) {
1775                 case SIOCETHTOOL:
1776                         return ether1394_ethtool_ioctl(dev, ifr->ifr_data);
1777
1778                 case SIOCGMIIPHY:               /* Get address of MII PHY in use. */
1779                 case SIOCGMIIREG:               /* Read MII PHY register. */
1780                 case SIOCSMIIREG:               /* Write MII PHY register. */
1781                 default:
1782                         return -EOPNOTSUPP;
1783         }
1784
1785         return 0;
1786 }
1787
1788 static int ether1394_ethtool_ioctl(struct net_device *dev, void __user *useraddr)
1789 {
1790         u32 ethcmd;
1791
1792         if (get_user(ethcmd, (u32 __user *)useraddr))
1793                 return -EFAULT;
1794
1795         switch (ethcmd) {
1796                 case ETHTOOL_GDRVINFO: {
1797                         struct ethtool_drvinfo info = { ETHTOOL_GDRVINFO };
1798                         strcpy (info.driver, driver_name);
1799                         strcpy (info.version, "$Rev: 1224 $");
1800                         /* FIXME XXX provide sane businfo */
1801                         strcpy (info.bus_info, "ieee1394");
1802                         if (copy_to_user (useraddr, &info, sizeof (info)))
1803                                 return -EFAULT;
1804                         break;
1805                 }
1806                 case ETHTOOL_GSET:
1807                 case ETHTOOL_SSET:
1808                 case ETHTOOL_NWAY_RST:
1809                 case ETHTOOL_GLINK:
1810                 case ETHTOOL_GMSGLVL:
1811                 case ETHTOOL_SMSGLVL:
1812                 default:
1813                         return -EOPNOTSUPP;
1814         }
1815
1816         return 0;
1817 }
1818
1819
1820 static int __init ether1394_init_module (void)
1821 {
1822         packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
1823                                               0, 0, NULL, NULL);
1824
1825         /* Register ourselves as a highlevel driver */
1826         hpsb_register_highlevel(&eth1394_highlevel);
1827
1828         return hpsb_register_protocol(&eth1394_proto_driver);
1829 }
1830
1831 static void __exit ether1394_exit_module (void)
1832 {
1833         hpsb_unregister_protocol(&eth1394_proto_driver);
1834         hpsb_unregister_highlevel(&eth1394_highlevel);
1835         kmem_cache_destroy(packet_task_cache);
1836 }
1837
1838 module_init(ether1394_init_module);
1839 module_exit(ether1394_exit_module);