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: 1247 $ 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 "eth1394"
 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.
 169  */
 170 static int max_partial_datagrams = 25;
 171 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
 172 MODULE_PARM_DESC(max_partial_datagrams,
 173                  "Maximum number of partially received fragmented datagrams "
 174                  "(default = 25).");
 175
 176
 177 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 178                             unsigned short type, void *daddr, void *saddr,
 179                             unsigned len);
 180 static int ether1394_rebuild_header(struct sk_buff *skb);
 181 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
 182 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 183 static void ether1394_header_cache_update(struct hh_cache *hh,
 184                                           struct net_device *dev,
 185                                           unsigned char * haddr);
 186 static int ether1394_mac_addr(struct net_device *dev, void *p);
 187
 188 static void purge_partial_datagram(struct list_head *old);
 189 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 190 static void ether1394_iso(struct hpsb_iso *iso);
 191
 192 static struct ethtool_ops ethtool_ops;
 193
 194 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 195                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 196 static void ether1394_add_host (struct hpsb_host *host);
 197 static void ether1394_remove_host (struct hpsb_host *host);
 198 static void ether1394_host_reset (struct hpsb_host *host);
 199
 200 /* Function for incoming 1394 packets */
 201 static struct hpsb_address_ops addr_ops = {
 202         .write =        ether1394_write,
 203 };
 204
 205 /* Ieee1394 highlevel driver functions */
 206 static struct hpsb_highlevel eth1394_highlevel = {
 207         .name =         driver_name,
 208         .add_host =     ether1394_add_host,
 209         .remove_host =  ether1394_remove_host,
 210         .host_reset =   ether1394_host_reset,
 211 };
 212
 213
 214 /* This is called after an "ifup" */
 215 static int ether1394_open (struct net_device *dev)
 216 {
 217         struct eth1394_priv *priv = netdev_priv(dev);
 218         int ret = 0;
 219
 220         /* Something bad happened, don't even try */
 221         if (priv->bc_state == ETHER1394_BC_ERROR) {
 222                 /* we'll try again */
 223                 priv->iso = hpsb_iso_recv_init(priv->host,
 224                                                ETHER1394_GASP_BUFFERS * 2 *
 225                                                (1 << (priv->host->csr.max_rec +
 226                                                       1)),
 227                                                ETHER1394_GASP_BUFFERS,
 228                                                priv->broadcast_channel,
 229                                                HPSB_ISO_DMA_PACKET_PER_BUFFER,
 230                                                1, ether1394_iso);
 231                 if (priv->iso == NULL) {
 232                         ETH1394_PRINT(KERN_ERR, dev->name,
 233                                       "Could not allocate isochronous receive "
 234                                       "context for the broadcast channel\n");
 235                         priv->bc_state = ETHER1394_BC_ERROR;
 236                         ret = -EAGAIN;
 237                 } else {
 238                         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 239                                 priv->bc_state = ETHER1394_BC_STOPPED;
 240                         else
 241                                 priv->bc_state = ETHER1394_BC_RUNNING;
 242                 }
 243         }
 244
 245         if (ret)
 246                 return ret;
 247
 248         netif_start_queue (dev);
 249         return 0;
 250 }
 251
 252 /* This is called after an "ifdown" */
 253 static int ether1394_stop (struct net_device *dev)
 254 {
 255         netif_stop_queue (dev);
 256         return 0;
 257 }
 258
 259 /* Return statistics to the caller */
 260 static struct net_device_stats *ether1394_stats (struct net_device *dev)
 261 {
 262         return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
 263 }
 264
 265 /* What to do if we timeout. I think a host reset is probably in order, so
 266  * that's what we do. Should we increment the stat counters too?  */
 267 static void ether1394_tx_timeout (struct net_device *dev)
 268 {
 269         ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
 270                        ((struct eth1394_priv *)netdev_priv(dev))->host->driver->name);
 271
 272         highlevel_host_reset (((struct eth1394_priv *)netdev_priv(dev))->host);
 273
 274         netif_wake_queue (dev);
 275 }
 276
 277 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 278 {
 279         struct eth1394_priv *priv = netdev_priv(dev);
 280
 281         if ((new_mtu < 68) ||
 282             (new_mtu > min(ETH1394_DATA_LEN,
 283                            (int)((1 << (priv->host->csr.max_rec + 1)) -
 284                                  (sizeof(union eth1394_hdr) +
 285                                   ETHER1394_GASP_OVERHEAD)))))
 286                 return -EINVAL;
 287         dev->mtu = new_mtu;
 288         return 0;
 289 }
 290
 291 static void purge_partial_datagram(struct list_head *old)
 292 {
 293         struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
 294         struct list_head *lh, *n;
 295
 296         list_for_each_safe(lh, n, &pd->frag_info) {
 297                 struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
 298                 list_del(lh);
 299                 kfree(fi);
 300         }
 301         list_del(old);
 302         kfree_skb(pd->skb);
 303         kfree(pd);
 304 }
 305
 306 /******************************************
 307  * 1394 bus activity functions
 308  ******************************************/
 309
 310 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 311                                                   struct unit_directory *ud)
 312 {
 313         struct eth1394_node_ref *node;
 314
 315         list_for_each_entry(node, inl, list)
 316                 if (node->ud == ud)
 317                         return node;
 318
 319         return NULL;
 320 }
 321
 322 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 323                                                        u64 guid)
 324 {
 325         struct eth1394_node_ref *node;
 326
 327         list_for_each_entry(node, inl, list)
 328                 if (node->ud->ne->guid == guid)
 329                         return node;
 330
 331         return NULL;
 332 }
 333
 334 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 335                                                          nodeid_t nodeid)
 336 {
 337         struct eth1394_node_ref *node;
 338         list_for_each_entry(node, inl, list) {
 339                 if (node->ud->ne->nodeid == nodeid)
 340                         return node;
 341         }
 342
 343         return NULL;
 344 }
 345
 346 static int eth1394_probe(struct device *dev)
 347 {
 348         struct unit_directory *ud;
 349         struct eth1394_host_info *hi;
 350         struct eth1394_priv *priv;
 351         struct eth1394_node_ref *new_node;
 352         struct eth1394_node_info *node_info;
 353
 354         ud = container_of(dev, struct unit_directory, device);
 355
 356         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 357         if (!hi)
 358                 return -ENOENT;
 359
 360         new_node = kmalloc(sizeof(struct eth1394_node_ref),
 361                            in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 362         if (!new_node)
 363                 return -ENOMEM;
 364
 365         node_info = kmalloc(sizeof(struct eth1394_node_info),
 366                             in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 367         if (!node_info) {
 368                 kfree(new_node);
 369                 return -ENOMEM;
 370         }
 371
 372         spin_lock_init(&node_info->pdg.lock);
 373         INIT_LIST_HEAD(&node_info->pdg.list);
 374         node_info->pdg.sz = 0;
 375         node_info->fifo = ETHER1394_INVALID_ADDR;
 376
 377         ud->device.driver_data = node_info;
 378         new_node->ud = ud;
 379
 380         priv = netdev_priv(hi->dev);
 381         list_add_tail(&new_node->list, &priv->ip_node_list);
 382
 383         return 0;
 384 }
 385
 386 static int eth1394_remove(struct device *dev)
 387 {
 388         struct unit_directory *ud;
 389         struct eth1394_host_info *hi;
 390         struct eth1394_priv *priv;
 391         struct eth1394_node_ref *old_node;
 392         struct eth1394_node_info *node_info;
 393         struct list_head *lh, *n;
 394         unsigned long flags;
 395
 396         ud = container_of(dev, struct unit_directory, device);
 397         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 398         if (!hi)
 399                 return -ENOENT;
 400
 401         priv = netdev_priv(hi->dev);
 402
 403         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 404
 405         if (old_node) {
 406                 list_del(&old_node->list);
 407                 kfree(old_node);
 408
 409                 node_info = (struct eth1394_node_info*)ud->device.driver_data;
 410
 411                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 412                 /* The partial datagram list should be empty, but we'll just
 413                  * make sure anyway... */
 414                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 415                         purge_partial_datagram(lh);
 416                 }
 417                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 418
 419                 kfree(node_info);
 420                 ud->device.driver_data = NULL;
 421         }
 422         return 0;
 423 }
 424
 425 static int eth1394_update(struct unit_directory *ud)
 426 {
 427         struct eth1394_host_info *hi;
 428         struct eth1394_priv *priv;
 429         struct eth1394_node_ref *node;
 430         struct eth1394_node_info *node_info;
 431
 432         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 433         if (!hi)
 434                 return -ENOENT;
 435
 436         priv = netdev_priv(hi->dev);
 437
 438         node = eth1394_find_node(&priv->ip_node_list, ud);
 439
 440         if (!node) {
 441                 node = kmalloc(sizeof(struct eth1394_node_ref),
 442                                in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 443                 if (!node)
 444                         return -ENOMEM;
 445
 446                 node_info = kmalloc(sizeof(struct eth1394_node_info),
 447                                     in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 448                 if (!node_info) {
 449                         kfree(node);
 450                         return -ENOMEM;
 451                 }
 452
 453                 spin_lock_init(&node_info->pdg.lock);
 454                 INIT_LIST_HEAD(&node_info->pdg.list);
 455                 node_info->pdg.sz = 0;
 456
 457                 ud->device.driver_data = node_info;
 458                 node->ud = ud;
 459
 460                 priv = netdev_priv(hi->dev);
 461                 list_add_tail(&node->list, &priv->ip_node_list);
 462         }
 463
 464         return 0;
 465 }
 466
 467
 468 static struct ieee1394_device_id eth1394_id_table[] = {
 469         {
 470                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 471                                 IEEE1394_MATCH_VERSION),
 472                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 473                 .version = ETHER1394_GASP_VERSION,
 474         },
 475         {}
 476 };
 477
 478 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 479
 480 static struct hpsb_protocol_driver eth1394_proto_driver = {
 481         .name           = "IPv4 over 1394 Driver",
 482         .id_table       = eth1394_id_table,
 483         .update         = eth1394_update,
 484         .driver         = {
 485                 .name           = ETH1394_DRIVER_NAME,
 486                 .bus            = &ieee1394_bus_type,
 487                 .probe          = eth1394_probe,
 488                 .remove         = eth1394_remove,
 489         },
 490 };
 491
 492
 493 static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
 494 {
 495         unsigned long flags;
 496         int i;
 497         struct eth1394_priv *priv = netdev_priv(dev);
 498         struct hpsb_host *host = priv->host;
 499         u64 guid = *((u64*)&(host->csr.rom->bus_info_data[3]));
 500         u16 maxpayload = 1 << (host->csr.max_rec + 1);
 501         int max_speed = IEEE1394_SPEED_MAX;
 502
 503         spin_lock_irqsave (&priv->lock, flags);
 504
 505         memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
 506         priv->bc_maxpayload = 512;
 507
 508         /* Determine speed limit */
 509         for (i = 0; i < host->node_count; i++)
 510                 if (max_speed > host->speed_map[NODEID_TO_NODE(host->node_id) *
 511                                                 64 + i])
 512                         max_speed = host->speed_map[NODEID_TO_NODE(host->node_id) *
 513                                                     64 + i];
 514         priv->bc_sspd = max_speed;
 515
 516         /* We'll use our maxpayload as the default mtu */
 517         if (set_mtu) {
 518                 dev->mtu = min(ETH1394_DATA_LEN,
 519                                (int)(maxpayload -
 520                                      (sizeof(union eth1394_hdr) +
 521                                       ETHER1394_GASP_OVERHEAD)));
 522
 523                 /* Set our hardware address while we're at it */
 524                 *(u64*)dev->dev_addr = guid;
 525                 *(u64*)dev->broadcast = ~0x0ULL;
 526         }
 527
 528         spin_unlock_irqrestore (&priv->lock, flags);
 529 }
 530
 531 /* This function is called right before register_netdev */
 532 static void ether1394_init_dev (struct net_device *dev)
 533 {
 534         /* Our functions */
 535         dev->open               = ether1394_open;
 536         dev->stop               = ether1394_stop;
 537         dev->hard_start_xmit    = ether1394_tx;
 538         dev->get_stats          = ether1394_stats;
 539         dev->tx_timeout         = ether1394_tx_timeout;
 540         dev->change_mtu         = ether1394_change_mtu;
 541
 542         dev->hard_header        = ether1394_header;
 543         dev->rebuild_header     = ether1394_rebuild_header;
 544         dev->hard_header_cache  = ether1394_header_cache;
 545         dev->header_cache_update= ether1394_header_cache_update;
 546         dev->hard_header_parse  = ether1394_header_parse;
 547         dev->set_mac_address    = ether1394_mac_addr;
 548         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 549
 550         /* Some constants */
 551         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 552         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 553         dev->features           = NETIF_F_HIGHDMA;
 554         dev->addr_len           = ETH1394_ALEN;
 555         dev->hard_header_len    = ETH1394_HLEN;
 556         dev->type               = ARPHRD_IEEE1394;
 557
 558         ether1394_reset_priv (dev, 1);
 559 }
 560
 561 /*
 562  * This function is called every time a card is found. It is generally called
 563  * when the module is installed. This is where we add all of our ethernet
 564  * devices. One for each host.
 565  */
 566 static void ether1394_add_host (struct hpsb_host *host)
 567 {
 568         struct eth1394_host_info *hi = NULL;
 569         struct net_device *dev = NULL;
 570         struct eth1394_priv *priv;
 571         static int version_printed = 0;
 572         u64 fifo_addr;
 573
 574         if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
 575                 return;
 576
 577         fifo_addr = hpsb_allocate_and_register_addrspace(&eth1394_highlevel,
 578                                                          host,
 579                                                          &addr_ops,
 580                                                          ETHER1394_REGION_ADDR_LEN,
 581                                                          ETHER1394_REGION_ADDR_LEN,
 582                                                          -1, -1);
 583         if (fifo_addr == ~0ULL)
 584                 goto out;
 585
 586         if (version_printed++ == 0)
 587                 ETH1394_PRINT_G (KERN_INFO, "%s\n", version);
 588
 589         /* We should really have our own alloc_hpsbdev() function in
 590          * net_init.c instead of calling the one for ethernet then hijacking
 591          * it for ourselves.  That way we'd be a real networking device. */
 592         dev = alloc_etherdev(sizeof (struct eth1394_priv));
 593
 594         if (dev == NULL) {
 595                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
 596                                  "etherdevice for IEEE 1394 device %s-%d\n",
 597                                  host->driver->name, host->id);
 598                 goto out;
 599         }
 600
 601         SET_MODULE_OWNER(dev);
 602         SET_NETDEV_DEV(dev, &host->device);
 603
 604         priv = netdev_priv(dev);
 605
 606         INIT_LIST_HEAD(&priv->ip_node_list);
 607
 608         spin_lock_init(&priv->lock);
 609         priv->host = host;
 610         priv->local_fifo = fifo_addr;
 611
 612         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 613
 614         if (hi == NULL) {
 615                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
 616                                  "hostinfo for IEEE 1394 device %s-%d\n",
 617                                  host->driver->name, host->id);
 618                 goto out;
 619         }
 620
 621         ether1394_init_dev(dev);
 622
 623         if (register_netdev (dev)) {
 624                 ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
 625                 goto out;
 626         }
 627
 628         ETH1394_PRINT (KERN_INFO, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet (fw-host%d)\n",
 629                        host->id);
 630
 631         hi->host = host;
 632         hi->dev = dev;
 633
 634         /* Ignore validity in hopes that it will be set in the future.  It'll
 635          * be checked when the eth device is opened. */
 636         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 637
 638         priv->iso = hpsb_iso_recv_init(host, (ETHER1394_GASP_BUFFERS * 2 *
 639                                               (1 << (host->csr.max_rec + 1))),
 640                                        ETHER1394_GASP_BUFFERS,
 641                                        priv->broadcast_channel,
 642                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 643                                        1, ether1394_iso);
 644         if (priv->iso == NULL) {
 645                 ETH1394_PRINT(KERN_ERR, dev->name,
 646                               "Could not allocate isochronous receive context "
 647                               "for the broadcast channel\n");
 648                 priv->bc_state = ETHER1394_BC_ERROR;
 649         } else {
 650                 if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 651                         priv->bc_state = ETHER1394_BC_STOPPED;
 652                 else
 653                         priv->bc_state = ETHER1394_BC_RUNNING;
 654         }
 655
 656         return;
 657
 658 out:
 659         if (dev != NULL)
 660                 free_netdev(dev);
 661         if (hi)
 662                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 663
 664         return;
 665 }
 666
 667 /* Remove a card from our list */
 668 static void ether1394_remove_host (struct hpsb_host *host)
 669 {
 670         struct eth1394_host_info *hi;
 671
 672         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 673         if (hi != NULL) {
 674                 struct eth1394_priv *priv = netdev_priv(hi->dev);
 675
 676                 hpsb_unregister_addrspace(&eth1394_highlevel, host,
 677                                           priv->local_fifo);
 678
 679                 if (priv->iso != NULL)
 680                         hpsb_iso_shutdown(priv->iso);
 681
 682                 if (hi->dev) {
 683                         unregister_netdev (hi->dev);
 684                         free_netdev(hi->dev);
 685                 }
 686         }
 687
 688         return;
 689 }
 690
 691 /* A reset has just arisen */
 692 static void ether1394_host_reset (struct hpsb_host *host)
 693 {
 694         struct eth1394_host_info *hi;
 695         struct eth1394_priv *priv;
 696         struct net_device *dev;
 697         struct list_head *lh, *n;
 698         struct eth1394_node_ref *node;
 699         struct eth1394_node_info *node_info;
 700         unsigned long flags;
 701
 702         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 703
 704         /* This can happen for hosts that we don't use */
 705         if (hi == NULL)
 706                 return;
 707
 708         dev = hi->dev;
 709         priv = netdev_priv(dev);
 710
 711         /* Reset our private host data, but not our mtu */
 712         netif_stop_queue (dev);
 713         ether1394_reset_priv (dev, 0);
 714
 715         list_for_each_entry(node, &priv->ip_node_list, list) {
 716                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 717
 718                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 719
 720                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 721                         purge_partial_datagram(lh);
 722                 }
 723
 724                 INIT_LIST_HEAD(&(node_info->pdg.list));
 725                 node_info->pdg.sz = 0;
 726
 727                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 728         }
 729
 730         netif_wake_queue (dev);
 731 }
 732
 733 /******************************************
 734  * HW Header net device functions
 735  ******************************************/
 736 /* These functions have been adapted from net/ethernet/eth.c */
 737
 738
 739 /* Create a fake MAC header for an arbitrary protocol layer.
 740  * saddr=NULL means use device source address
 741  * daddr=NULL means leave destination address (eg unresolved arp). */
 742 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 743                             unsigned short type, void *daddr, void *saddr,
 744                             unsigned len)
 745 {
 746         struct eth1394hdr *eth = (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 747
 748         eth->h_proto = htons(type);
 749
 750         if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) {
 751                 memset(eth->h_dest, 0, dev->addr_len);
 752                 return(dev->hard_header_len);
 753         }
 754
 755         if (daddr) {
 756                 memcpy(eth->h_dest,daddr,dev->addr_len);
 757                 return dev->hard_header_len;
 758         }
 759
 760         return -dev->hard_header_len;
 761
 762 }
 763
 764
 765 /* Rebuild the faked MAC header. This is called after an ARP
 766  * (or in future other address resolution) has completed on this
 767  * sk_buff. We now let ARP fill in the other fields.
 768  *
 769  * This routine CANNOT use cached dst->neigh!
 770  * Really, it is used only when dst->neigh is wrong.
 771  */
 772 static int ether1394_rebuild_header(struct sk_buff *skb)
 773 {
 774         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 775         struct net_device *dev = skb->dev;
 776
 777         switch (eth->h_proto) {
 778
 779 #ifdef CONFIG_INET
 780         case __constant_htons(ETH_P_IP):
 781                 return arp_find((unsigned char*)&eth->h_dest, skb);
 782 #endif
 783         default:
 784                 ETH1394_PRINT(KERN_DEBUG, dev->name,
 785                               "unable to resolve type %04x addresses.\n",
 786                               eth->h_proto);
 787                 break;
 788         }
 789
 790         return 0;
 791 }
 792
 793 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
 794 {
 795         struct net_device *dev = skb->dev;
 796         memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
 797         return ETH1394_ALEN;
 798 }
 799
 800
 801 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 802 {
 803         unsigned short type = hh->hh_type;
 804         struct eth1394hdr *eth = (struct eth1394hdr*)(((u8*)hh->hh_data) +
 805                                                       (16 - ETH1394_HLEN));
 806         struct net_device *dev = neigh->dev;
 807
 808         if (type == __constant_htons(ETH_P_802_3)) {
 809                 return -1;
 810         }
 811
 812         eth->h_proto = type;
 813         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 814
 815         hh->hh_len = ETH1394_HLEN;
 816         return 0;
 817 }
 818
 819 /* Called by Address Resolution module to notify changes in address. */
 820 static void ether1394_header_cache_update(struct hh_cache *hh,
 821                                           struct net_device *dev,
 822                                           unsigned char * haddr)
 823 {
 824         memcpy(((u8*)hh->hh_data) + (16 - ETH1394_HLEN), haddr, dev->addr_len);
 825 }
 826
 827 static int ether1394_mac_addr(struct net_device *dev, void *p)
 828 {
 829         if (netif_running(dev))
 830                 return -EBUSY;
 831
 832         /* Not going to allow setting the MAC address, we really need to use
 833          * the real one supplied by the hardware */
 834          return -EINVAL;
 835  }
 836
 837
 838
 839 /******************************************
 840  * Datagram reception code
 841  ******************************************/
 842
 843 /* Copied from net/ethernet/eth.c */
 844 static inline u16 ether1394_type_trans(struct sk_buff *skb,
 845                                        struct net_device *dev)
 846 {
 847         struct eth1394hdr *eth;
 848         unsigned char *rawp;
 849
 850         skb->mac.raw = skb->data;
 851         skb_pull (skb, ETH1394_HLEN);
 852         eth = eth1394_hdr(skb);
 853
 854         if (*eth->h_dest & 1) {
 855                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
 856                         skb->pkt_type = PACKET_BROADCAST;
 857 #if 0
 858                 else
 859                         skb->pkt_type = PACKET_MULTICAST;
 860 #endif
 861         } else {
 862                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 863                         skb->pkt_type = PACKET_OTHERHOST;
 864         }
 865
 866         if (ntohs (eth->h_proto) >= 1536)
 867                 return eth->h_proto;
 868
 869         rawp = skb->data;
 870
 871         if (*(unsigned short *)rawp == 0xFFFF)
 872                 return htons (ETH_P_802_3);
 873
 874         return htons (ETH_P_802_2);
 875 }
 876
 877 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 878  * We also perform ARP translation here, if need be.  */
 879 static inline u16 ether1394_parse_encap(struct sk_buff *skb,
 880                                         struct net_device *dev,
 881                                         nodeid_t srcid, nodeid_t destid,
 882                                         u16 ether_type)
 883 {
 884         struct eth1394_priv *priv = netdev_priv(dev);
 885         u64 dest_hw;
 886         unsigned short ret = 0;
 887
 888         /* Setup our hw addresses. We use these to build the
 889          * ethernet header.  */
 890         if (destid == (LOCAL_BUS | ALL_NODES))
 891                 dest_hw = ~0ULL;  /* broadcast */
 892         else
 893                 dest_hw = cpu_to_be64((((u64)priv->host->csr.guid_hi) << 32) |
 894                                       priv->host->csr.guid_lo);
 895
 896         /* If this is an ARP packet, convert it. First, we want to make
 897          * use of some of the fields, since they tell us a little bit
 898          * about the sending machine.  */
 899         if (ether_type == __constant_htons (ETH_P_ARP)) {
 900                 struct eth1394_arp *arp1394 = (struct eth1394_arp*)skb->data;
 901                 struct arphdr *arp = (struct arphdr *)skb->data;
 902                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 903                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 904                         ntohl(arp1394->fifo_lo);
 905                 u8 max_rec = min(priv->host->csr.max_rec,
 906                                  (u8)(arp1394->max_rec));
 907                 int sspd = arp1394->sspd;
 908                 u16 maxpayload;
 909                 struct eth1394_node_ref *node;
 910                 struct eth1394_node_info *node_info;
 911
 912                 /* Sanity check. MacOSX seems to be sending us 131 in this
 913                  * field (atleast on my Panther G5). Not sure why. */
 914                 if (sspd > 5 || sspd < 0)
 915                         sspd = 0;
 916
 917                 maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
 918
 919                 node = eth1394_find_node_guid(&priv->ip_node_list,
 920                                               be64_to_cpu(arp1394->s_uniq_id));
 921                 if (!node) {
 922                         return 0;
 923                 }
 924
 925                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 926
 927                 /* Update our speed/payload/fifo_offset table */
 928                 node_info->maxpayload = maxpayload;
 929                 node_info->sspd =       sspd;
 930                 node_info->fifo =       fifo_addr;
 931
 932                 /* Now that we're done with the 1394 specific stuff, we'll
 933                  * need to alter some of the data.  Believe it or not, all
 934                  * that needs to be done is sender_IP_address needs to be
 935                  * moved, the destination hardware address get stuffed
 936                  * in and the hardware address length set to 8.
 937                  *
 938                  * IMPORTANT: The code below overwrites 1394 specific data
 939                  * needed above so keep the munging of the data for the
 940                  * higher level IP stack last. */
 941
 942                 arp->ar_hln = 8;
 943                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 944                 *(u32*)arp_ptr = arp1394->sip;  /* move sender IP addr */
 945                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 946
 947                 if (arp->ar_op == 1)
 948                         /* just set ARP req target unique ID to 0 */
 949                         *((u64*)arp_ptr) = 0;
 950                 else
 951                         *((u64*)arp_ptr) = *((u64*)dev->dev_addr);
 952         }
 953
 954         /* Now add the ethernet header. */
 955         if (dev->hard_header (skb, dev, __constant_ntohs (ether_type),
 956                               &dest_hw, NULL, skb->len) >= 0)
 957                 ret = ether1394_type_trans(skb, dev);
 958
 959         return ret;
 960 }
 961
 962 static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
 963 {
 964         struct fragment_info *fi;
 965
 966         list_for_each_entry(fi, frag_list, list) {
 967                 if ( ! ((offset > (fi->offset + fi->len - 1)) ||
 968                        ((offset + len - 1) < fi->offset)))
 969                         return 1;
 970         }
 971         return 0;
 972 }
 973
 974 static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 975 {
 976         struct partial_datagram *pd;
 977
 978         list_for_each_entry(pd, pdgl, list) {
 979                 if (pd->dgl == dgl)
 980                         return &pd->list;
 981         }
 982         return NULL;
 983 }
 984
 985 /* Assumes that new fragment does not overlap any existing fragments */
 986 static inline int new_fragment(struct list_head *frag_info, int offset, int len)
 987 {
 988         struct list_head *lh;
 989         struct fragment_info *fi, *fi2, *new;
 990
 991         list_for_each(lh, frag_info) {
 992                 fi = list_entry(lh, struct fragment_info, list);
 993                 if ((fi->offset + fi->len) == offset) {
 994                         /* The new fragment can be tacked on to the end */
 995                         fi->len += len;
 996                         /* Did the new fragment plug a hole? */
 997                         fi2 = list_entry(lh->next, struct fragment_info, list);
 998                         if ((fi->offset + fi->len) == fi2->offset) {
 999                                 /* glue fragments together */
1000                                 fi->len += fi2->len;
1001                                 list_del(lh->next);
1002                                 kfree(fi2);
1003                         }
1004                         return 0;
1005                 } else if ((offset + len) == fi->offset) {
1006                         /* The new fragment can be tacked on to the beginning */
1007                         fi->offset = offset;
1008                         fi->len += len;
1009                         /* Did the new fragment plug a hole? */
1010                         fi2 = list_entry(lh->prev, struct fragment_info, list);
1011                         if ((fi2->offset + fi2->len) == fi->offset) {
1012                                 /* glue fragments together */
1013                                 fi2->len += fi->len;
1014                                 list_del(lh);
1015                                 kfree(fi);
1016                         }
1017                         return 0;
1018                 } else if (offset > (fi->offset + fi->len)) {
1019                         break;
1020                 } else if ((offset + len) < fi->offset) {
1021                         lh = lh->prev;
1022                         break;
1023                 }
1024         }
1025
1026         new = kmalloc(sizeof(struct fragment_info), GFP_ATOMIC);
1027         if (!new)
1028                 return -ENOMEM;
1029
1030         new->offset = offset;
1031         new->len = len;
1032
1033         list_add(&new->list, lh);
1034
1035         return 0;
1036 }
1037
1038 static inline int new_partial_datagram(struct net_device *dev,
1039                                        struct list_head *pdgl, int dgl,
1040                                        int dg_size, char *frag_buf,
1041                                        int frag_off, int frag_len)
1042 {
1043         struct partial_datagram *new;
1044
1045         new = kmalloc(sizeof(struct partial_datagram), GFP_ATOMIC);
1046         if (!new)
1047                 return -ENOMEM;
1048
1049         INIT_LIST_HEAD(&new->frag_info);
1050
1051         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1052                 kfree(new);
1053                 return -ENOMEM;
1054         }
1055
1056         new->dgl = dgl;
1057         new->dg_size = dg_size;
1058
1059         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1060         if (!new->skb) {
1061                 struct fragment_info *fi = list_entry(new->frag_info.next,
1062                                                       struct fragment_info,
1063                                                       list);
1064                 kfree(fi);
1065                 kfree(new);
1066                 return -ENOMEM;
1067         }
1068
1069         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1070         new->pbuf = skb_put(new->skb, dg_size);
1071         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1072
1073         list_add(&new->list, pdgl);
1074
1075         return 0;
1076 }
1077
1078 static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1079                                           char *frag_buf, int frag_off, int frag_len)
1080 {
1081         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1082
1083         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
1084                 return -ENOMEM;
1085         }
1086
1087         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1088
1089         /* Move list entry to beginnig of list so that oldest partial
1090          * datagrams percolate to the end of the list */
1091         list_del(lh);
1092         list_add(lh, pdgl);
1093
1094         return 0;
1095 }
1096
1097 static inline int is_datagram_complete(struct list_head *lh, int dg_size)
1098 {
1099         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1100         struct fragment_info *fi = list_entry(pd->frag_info.next,
1101                                               struct fragment_info, list);
1102
1103         return (fi->len == dg_size);
1104 }
1105
1106 /* Packet reception. We convert the IP1394 encapsulation header to an
1107  * ethernet header, and fill it with some of our other fields. This is
1108  * an incoming packet from the 1394 bus.  */
1109 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1110                                   char *buf, int len)
1111 {
1112         struct sk_buff *skb;
1113         unsigned long flags;
1114         struct eth1394_priv *priv = netdev_priv(dev);
1115         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1116         u16 ether_type = 0;  /* initialized to clear warning */
1117         int hdr_len;
1118         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1119         struct eth1394_node_info *node_info;
1120
1121         if (!ud) {
1122                 struct eth1394_node_ref *node;
1123                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1124                 if (!node) {
1125                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1126                                    "lookup failure: " NODE_BUS_FMT,
1127                                    NODE_BUS_ARGS(priv->host, srcid));
1128                         priv->stats.rx_dropped++;
1129                         return -1;
1130                 }
1131                 ud = node->ud;
1132
1133                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1134         }
1135
1136         node_info = (struct eth1394_node_info*)ud->device.driver_data;
1137
1138         /* First, did we receive a fragmented or unfragmented datagram? */
1139         hdr->words.word1 = ntohs(hdr->words.word1);
1140
1141         hdr_len = hdr_type_len[hdr->common.lf];
1142
1143         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1144                 /* An unfragmented datagram has been received by the ieee1394
1145                  * bus. Build an skbuff around it so we can pass it to the
1146                  * high level network layer. */
1147
1148                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1149                 if (!skb) {
1150                         HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
1151                         priv->stats.rx_dropped++;
1152                         return -1;
1153                 }
1154                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1155                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
1156                 ether_type = hdr->uf.ether_type;
1157         } else {
1158                 /* A datagram fragment has been received, now the fun begins. */
1159
1160                 struct list_head *pdgl, *lh;
1161                 struct partial_datagram *pd;
1162                 int fg_off;
1163                 int fg_len = len - hdr_len;
1164                 int dg_size;
1165                 int dgl;
1166                 int retval;
1167                 struct pdg_list *pdg = &(node_info->pdg);
1168
1169                 hdr->words.word3 = ntohs(hdr->words.word3);
1170                 /* The 4th header word is reserved so no need to do ntohs() */
1171
1172                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1173                         ether_type = hdr->ff.ether_type;
1174                         dgl = hdr->ff.dgl;
1175                         dg_size = hdr->ff.dg_size + 1;
1176                         fg_off = 0;
1177                 } else {
1178                         hdr->words.word2 = ntohs(hdr->words.word2);
1179                         dgl = hdr->sf.dgl;
1180                         dg_size = hdr->sf.dg_size + 1;
1181                         fg_off = hdr->sf.fg_off;
1182                 }
1183                 spin_lock_irqsave(&pdg->lock, flags);
1184
1185                 pdgl = &(pdg->list);
1186                 lh = find_partial_datagram(pdgl, dgl);
1187
1188                 if (lh == NULL) {
1189                         while (pdg->sz >= max_partial_datagrams) {
1190                                 /* remove the oldest */
1191                                 purge_partial_datagram(pdgl->prev);
1192                                 pdg->sz--;
1193                         }
1194
1195                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1196                                                       buf + hdr_len, fg_off,
1197                                                       fg_len);
1198                         if (retval < 0) {
1199                                 spin_unlock_irqrestore(&pdg->lock, flags);
1200                                 goto bad_proto;
1201                         }
1202                         pdg->sz++;
1203                         lh = find_partial_datagram(pdgl, dgl);
1204                 } else {
1205                         struct partial_datagram *pd;
1206
1207                         pd = list_entry(lh, struct partial_datagram, list);
1208
1209                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1210                                 /* Overlapping fragments, obliterate old
1211                                  * datagram and start new one. */
1212                                 purge_partial_datagram(lh);
1213                                 retval = new_partial_datagram(dev, pdgl, dgl,
1214                                                               dg_size,
1215                                                               buf + hdr_len,
1216                                                               fg_off, fg_len);
1217                                 if (retval < 0) {
1218                                         pdg->sz--;
1219                                         spin_unlock_irqrestore(&pdg->lock, flags);
1220                                         goto bad_proto;
1221                                 }
1222                         } else {
1223                                 retval = update_partial_datagram(pdgl, lh,
1224                                                                  buf + hdr_len,
1225                                                                  fg_off, fg_len);
1226                                 if (retval < 0) {
1227                                         /* Couldn't save off fragment anyway
1228                                          * so might as well obliterate the
1229                                          * datagram now. */
1230                                         purge_partial_datagram(lh);
1231                                         pdg->sz--;
1232                                         spin_unlock_irqrestore(&pdg->lock, flags);
1233                                         goto bad_proto;
1234                                 }
1235                         } /* fragment overlap */
1236                 } /* new datagram or add to existing one */
1237
1238                 pd = list_entry(lh, struct partial_datagram, list);
1239
1240                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1241                         pd->ether_type = ether_type;
1242                 }
1243
1244                 if (is_datagram_complete(lh, dg_size)) {
1245                         ether_type = pd->ether_type;
1246                         pdg->sz--;
1247                         skb = skb_get(pd->skb);
1248                         purge_partial_datagram(lh);
1249                         spin_unlock_irqrestore(&pdg->lock, flags);
1250                 } else {
1251                         /* Datagram is not complete, we're done for the
1252                          * moment. */
1253                         spin_unlock_irqrestore(&pdg->lock, flags);
1254                         return 0;
1255                 }
1256         } /* unframgented datagram or fragmented one */
1257
1258         /* Write metadata, and then pass to the receive level */
1259         skb->dev = dev;
1260         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1261
1262         /* Parse the encapsulation header. This actually does the job of
1263          * converting to an ethernet frame header, aswell as arp
1264          * conversion if needed. ARP conversion is easier in this
1265          * direction, since we are using ethernet as our backend.  */
1266         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1267                                               ether_type);
1268
1269
1270         spin_lock_irqsave(&priv->lock, flags);
1271         if (!skb->protocol) {
1272                 priv->stats.rx_errors++;
1273                 priv->stats.rx_dropped++;
1274                 dev_kfree_skb_any(skb);
1275                 goto bad_proto;
1276         }
1277
1278         if (netif_rx(skb) == NET_RX_DROP) {
1279                 priv->stats.rx_errors++;
1280                 priv->stats.rx_dropped++;
1281                 goto bad_proto;
1282         }
1283
1284         /* Statistics */
1285         priv->stats.rx_packets++;
1286         priv->stats.rx_bytes += skb->len;
1287
1288 bad_proto:
1289         if (netif_queue_stopped(dev))
1290                 netif_wake_queue(dev);
1291         spin_unlock_irqrestore(&priv->lock, flags);
1292
1293         dev->last_rx = jiffies;
1294
1295         return 0;
1296 }
1297
1298 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1299                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1300 {
1301         struct eth1394_host_info *hi;
1302
1303         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1304         if (hi == NULL) {
1305                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1306                                 host->driver->name);
1307                 return RCODE_ADDRESS_ERROR;
1308         }
1309
1310         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1311                 return RCODE_ADDRESS_ERROR;
1312         else
1313                 return RCODE_COMPLETE;
1314 }
1315
1316 static void ether1394_iso(struct hpsb_iso *iso)
1317 {
1318         quadlet_t *data;
1319         char *buf;
1320         struct eth1394_host_info *hi;
1321         struct net_device *dev;
1322         struct eth1394_priv *priv;
1323         unsigned int len;
1324         u32 specifier_id;
1325         u16 source_id;
1326         int i;
1327         int nready;
1328
1329         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1330         if (hi == NULL) {
1331                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1332                                 iso->host->driver->name);
1333                 return;
1334         }
1335
1336         dev = hi->dev;
1337
1338         nready = hpsb_iso_n_ready(iso);
1339         for (i = 0; i < nready; i++) {
1340                 struct hpsb_iso_packet_info *info =
1341                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1342                 data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
1343
1344                 /* skip over GASP header */
1345                 buf = (char *)data + 8;
1346                 len = info->len - 8;
1347
1348                 specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
1349                                 ((be32_to_cpu(data[1]) & 0xff000000) >> 24));
1350                 source_id = be32_to_cpu(data[0]) >> 16;
1351
1352                 priv = netdev_priv(dev);
1353
1354                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
1355                    specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1356                         /* This packet is not for us */
1357                         continue;
1358                 }
1359                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1360                                        buf, len);
1361         }
1362
1363         hpsb_iso_recv_release_packets(iso, i);
1364
1365         dev->last_rx = jiffies;
1366 }
1367
1368 /******************************************
1369  * Datagram transmission code
1370  ******************************************/
1371
1372 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1373  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1374  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1375  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1376  * judge.
1377  *
1378  * Now that the EUI is used for the hardware address all we need to do to make
1379  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1380  * speed, and unicast FIFO address information between the sender_unique_id
1381  * and the IP addresses.
1382  */
1383 static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
1384                                             struct net_device *dev)
1385 {
1386         struct eth1394_priv *priv = netdev_priv(dev);
1387
1388         struct arphdr *arp = (struct arphdr *)skb->data;
1389         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1390         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1391
1392         /* Believe it or not, all that need to happen is sender IP get moved
1393          * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
1394         arp1394->hw_addr_len    = 16;
1395         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1396         arp1394->max_rec        = priv->host->csr.max_rec;
1397         arp1394->sspd           = priv->host->csr.lnk_spd;
1398         arp1394->fifo_hi        = htons (priv->local_fifo >> 32);
1399         arp1394->fifo_lo        = htonl (priv->local_fifo & ~0x0);
1400
1401         return;
1402 }
1403
1404 /* We need to encapsulate the standard header with our own. We use the
1405  * ethernet header's proto for our own. */
1406 static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1407                                                       int proto,
1408                                                       union eth1394_hdr *hdr,
1409                                                       u16 dg_size, u16 dgl)
1410 {
1411         unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1412
1413         /* Does it all fit in one packet? */
1414         if (dg_size <= adj_max_payload) {
1415                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1416                 hdr->uf.ether_type = proto;
1417         } else {
1418                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1419                 hdr->ff.ether_type = proto;
1420                 hdr->ff.dg_size = dg_size - 1;
1421                 hdr->ff.dgl = dgl;
1422                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1423         }
1424         return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
1425 }
1426
1427 static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
1428                                                  unsigned int max_payload,
1429                                                  union eth1394_hdr *hdr)
1430 {
1431         union eth1394_hdr *bufhdr;
1432         int ftype = hdr->common.lf;
1433         int hdrsz = hdr_type_len[ftype];
1434         unsigned int adj_max_payload = max_payload - hdrsz;
1435
1436         switch(ftype) {
1437         case ETH1394_HDR_LF_UF:
1438                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1439                 bufhdr->words.word1 = htons(hdr->words.word1);
1440                 bufhdr->words.word2 = hdr->words.word2;
1441                 break;
1442
1443         case ETH1394_HDR_LF_FF:
1444                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1445                 bufhdr->words.word1 = htons(hdr->words.word1);
1446                 bufhdr->words.word2 = hdr->words.word2;
1447                 bufhdr->words.word3 = htons(hdr->words.word3);
1448                 bufhdr->words.word4 = 0;
1449
1450                 /* Set frag type here for future interior fragments */
1451                 hdr->common.lf = ETH1394_HDR_LF_IF;
1452                 hdr->sf.fg_off = 0;
1453                 break;
1454
1455         default:
1456                 hdr->sf.fg_off += adj_max_payload;
1457                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1458                 if (max_payload >= skb->len)
1459                         hdr->common.lf = ETH1394_HDR_LF_LF;
1460                 bufhdr->words.word1 = htons(hdr->words.word1);
1461                 bufhdr->words.word2 = htons(hdr->words.word2);
1462                 bufhdr->words.word3 = htons(hdr->words.word3);
1463                 bufhdr->words.word4 = 0;
1464         }
1465
1466         return min(max_payload, skb->len);
1467 }
1468
1469 static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1470 {
1471         struct hpsb_packet *p;
1472
1473         p = hpsb_alloc_packet(0);
1474         if (p) {
1475                 p->host = host;
1476                 p->generation = get_hpsb_generation(host);
1477                 p->type = hpsb_async;
1478         }
1479         return p;
1480 }
1481
1482 static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
1483                                               struct hpsb_host *host,
1484                                               nodeid_t node, u64 addr,
1485                                               void * data, int tx_len)
1486 {
1487         p->node_id = node;
1488         p->data = NULL;
1489
1490         p->tcode = TCODE_WRITEB;
1491         p->header[1] = (host->node_id << 16) | (addr >> 32);
1492         p->header[2] = addr & 0xffffffff;
1493
1494         p->header_size = 16;
1495         p->expect_response = 1;
1496
1497         if (hpsb_get_tlabel(p)) {
1498                 ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
1499                                 "to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
1500                 return -1;
1501         }
1502         p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
1503                 | (1 << 8) | (TCODE_WRITEB << 4);
1504
1505         p->header[3] = tx_len << 16;
1506         p->data_size = (tx_len + 3) & ~3;
1507         p->data = (quadlet_t*)data;
1508
1509         return 0;
1510 }
1511
1512 static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1513                                               struct eth1394_priv *priv,
1514                                               struct sk_buff *skb, int length)
1515 {
1516         p->header_size = 4;
1517         p->tcode = TCODE_STREAM_DATA;
1518
1519         p->header[0] = (length << 16) | (3 << 14)
1520                 | ((priv->broadcast_channel) << 8)
1521                 | (TCODE_STREAM_DATA << 4);
1522         p->data_size = length;
1523         p->data = ((quadlet_t*)skb->data) - 2;
1524         p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
1525                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1526         p->data[1] = __constant_cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
1527                                             ETHER1394_GASP_VERSION);
1528
1529         /* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
1530          * prevents hpsb_send_packet() from setting the speed to an arbitrary
1531          * value based on packet->node_id if packet->node_id is not set. */
1532         p->node_id = ALL_NODES;
1533         p->speed_code = priv->bc_sspd;
1534 }
1535
1536 static inline void ether1394_free_packet(struct hpsb_packet *packet)
1537 {
1538         if (packet->tcode != TCODE_STREAM_DATA)
1539                 hpsb_free_tlabel(packet);
1540         hpsb_free_packet(packet);
1541 }
1542
1543 static void ether1394_complete_cb(void *__ptask);
1544
1545 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1546 {
1547         struct eth1394_priv *priv = ptask->priv;
1548         struct hpsb_packet *packet = NULL;
1549
1550         packet = ether1394_alloc_common_packet(priv->host);
1551         if (!packet)
1552                 return -1;
1553
1554         if (ptask->tx_type == ETH1394_GASP) {
1555                 int length = tx_len + (2 * sizeof(quadlet_t));
1556
1557                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1558         } else if (ether1394_prep_write_packet(packet, priv->host,
1559                                                ptask->dest_node,
1560                                                ptask->addr, ptask->skb->data,
1561                                                tx_len)) {
1562                 hpsb_free_packet(packet);
1563                 return -1;
1564         }
1565
1566         ptask->packet = packet;
1567         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1568                                       ptask);
1569
1570         if (hpsb_send_packet(packet) < 0) {
1571                 ether1394_free_packet(packet);
1572                 return -1;
1573         }
1574
1575         return 0;
1576 }
1577
1578
1579 /* Task function to be run when a datagram transmission is completed */
1580 static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
1581 {
1582         struct sk_buff *skb = ptask->skb;
1583         struct net_device *dev = skb->dev;
1584         struct eth1394_priv *priv = netdev_priv(dev);
1585         unsigned long flags;
1586
1587         /* Statistics */
1588         spin_lock_irqsave(&priv->lock, flags);
1589         if (fail) {
1590                 priv->stats.tx_dropped++;
1591                 priv->stats.tx_errors++;
1592         } else {
1593                 priv->stats.tx_bytes += skb->len;
1594                 priv->stats.tx_packets++;
1595         }
1596         spin_unlock_irqrestore(&priv->lock, flags);
1597
1598         dev_kfree_skb_any(skb);
1599         kmem_cache_free(packet_task_cache, ptask);
1600 }
1601
1602
1603 /* Callback for when a packet has been sent and the status of that packet is
1604  * known */
1605 static void ether1394_complete_cb(void *__ptask)
1606 {
1607         struct packet_task *ptask = (struct packet_task *)__ptask;
1608         struct hpsb_packet *packet = ptask->packet;
1609         int fail = 0;
1610
1611         if (packet->tcode != TCODE_STREAM_DATA)
1612                 fail = hpsb_packet_success(packet);
1613
1614         ether1394_free_packet(packet);
1615
1616         ptask->outstanding_pkts--;
1617         if (ptask->outstanding_pkts > 0 && !fail) {
1618                 int tx_len;
1619
1620                 /* Add the encapsulation header to the fragment */
1621                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1622                                                &ptask->hdr);
1623                 if (ether1394_send_packet(ptask, tx_len))
1624                         ether1394_dg_complete(ptask, 1);
1625         } else {
1626                 ether1394_dg_complete(ptask, fail);
1627         }
1628 }
1629
1630
1631
1632 /* Transmit a packet (called by kernel) */
1633 static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
1634 {
1635         int kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
1636         struct eth1394hdr *eth;
1637         struct eth1394_priv *priv = netdev_priv(dev);
1638         int proto;
1639         unsigned long flags;
1640         nodeid_t dest_node;
1641         eth1394_tx_type tx_type;
1642         int ret = 0;
1643         unsigned int tx_len;
1644         unsigned int max_payload;
1645         u16 dg_size;
1646         u16 dgl;
1647         struct packet_task *ptask;
1648         struct eth1394_node_ref *node;
1649         struct eth1394_node_info *node_info = NULL;
1650
1651         ptask = kmem_cache_alloc(packet_task_cache, kmflags);
1652         if (ptask == NULL) {
1653                 ret = -ENOMEM;
1654                 goto fail;
1655         }
1656
1657         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1658          * it does not set our validity bit. We need to compensate for
1659          * that somewhere else, but not in eth1394. */
1660 #if 0
1661         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
1662                 ret = -EAGAIN;
1663                 goto fail;
1664         }
1665 #endif
1666
1667         if ((skb = skb_share_check (skb, kmflags)) == NULL) {
1668                 ret = -ENOMEM;
1669                 goto fail;
1670         }
1671
1672         /* Get rid of the fake eth1394 header, but save a pointer */
1673         eth = (struct eth1394hdr*)skb->data;
1674         skb_pull(skb, ETH1394_HLEN);
1675
1676         proto = eth->h_proto;
1677         dg_size = skb->len;
1678
1679         /* Set the transmission type for the packet.  ARP packets and IP
1680          * broadcast packets are sent via GASP. */
1681         if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1682             proto == __constant_htons(ETH_P_ARP) ||
1683             (proto == __constant_htons(ETH_P_IP) &&
1684              IN_MULTICAST(__constant_ntohl(skb->nh.iph->daddr)))) {
1685                 tx_type = ETH1394_GASP;
1686                 dest_node = LOCAL_BUS | ALL_NODES;
1687                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1688                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1689                 dgl = priv->bc_dgl;
1690                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1691                         priv->bc_dgl++;
1692         } else {
1693                 node = eth1394_find_node_guid(&priv->ip_node_list,
1694                                               be64_to_cpu(*(u64*)eth->h_dest));
1695                 if (!node) {
1696                         ret = -EAGAIN;
1697                         goto fail;
1698                 }
1699                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
1700                 if (node_info->fifo == ETHER1394_INVALID_ADDR) {
1701                         ret = -EAGAIN;
1702                         goto fail;
1703                 }
1704
1705                 dest_node = node->ud->ne->nodeid;
1706                 max_payload = node_info->maxpayload;
1707                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1708
1709                 dgl = node_info->dgl;
1710                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1711                         node_info->dgl++;
1712                 tx_type = ETH1394_WRREQ;
1713         }
1714
1715         /* If this is an ARP packet, convert it */
1716         if (proto == __constant_htons (ETH_P_ARP))
1717                 ether1394_arp_to_1394arp (skb, dev);
1718
1719         ptask->hdr.words.word1 = 0;
1720         ptask->hdr.words.word2 = 0;
1721         ptask->hdr.words.word3 = 0;
1722         ptask->hdr.words.word4 = 0;
1723         ptask->skb = skb;
1724         ptask->priv = priv;
1725         ptask->tx_type = tx_type;
1726
1727         if (tx_type != ETH1394_GASP) {
1728                 u64 addr;
1729
1730                 spin_lock_irqsave(&priv->lock, flags);
1731                 addr = node_info->fifo;
1732                 spin_unlock_irqrestore(&priv->lock, flags);
1733
1734                 ptask->addr = addr;
1735                 ptask->dest_node = dest_node;
1736         }
1737
1738         ptask->tx_type = tx_type;
1739         ptask->max_payload = max_payload;
1740         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
1741                                                              &ptask->hdr, dg_size,
1742                                                              dgl);
1743
1744         /* Add the encapsulation header to the fragment */
1745         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1746         dev->trans_start = jiffies;
1747         if (ether1394_send_packet(ptask, tx_len))
1748                 goto fail;
1749
1750         netif_wake_queue(dev);
1751         return 0;
1752 fail:
1753         if (ptask)
1754                 kmem_cache_free(packet_task_cache, ptask);
1755
1756         if (skb != NULL)
1757                 dev_kfree_skb(skb);
1758
1759         spin_lock_irqsave (&priv->lock, flags);
1760         priv->stats.tx_dropped++;
1761         priv->stats.tx_errors++;
1762         spin_unlock_irqrestore (&priv->lock, flags);
1763
1764         if (netif_queue_stopped(dev))
1765                 netif_wake_queue(dev);
1766
1767         return 0;  /* returning non-zero causes serious problems */
1768 }
1769
1770 static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1771 {
1772         strcpy (info->driver, driver_name);
1773         strcpy (info->version, "$Rev: 1247 $");
1774         /* FIXME XXX provide sane businfo */
1775         strcpy (info->bus_info, "ieee1394");
1776 }
1777
1778 static struct ethtool_ops ethtool_ops = {
1779         .get_drvinfo = ether1394_get_drvinfo
1780 };
1781
1782 static int __init ether1394_init_module (void)
1783 {
1784         packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
1785                                               0, 0, NULL, NULL);
1786
1787         /* Register ourselves as a highlevel driver */
1788         hpsb_register_highlevel(&eth1394_highlevel);
1789
1790         return hpsb_register_protocol(&eth1394_proto_driver);
1791 }
1792
1793 static void __exit ether1394_exit_module (void)
1794 {
1795         hpsb_unregister_protocol(&eth1394_proto_driver);
1796         hpsb_unregister_highlevel(&eth1394_highlevel);
1797         kmem_cache_destroy(packet_task_cache);
1798 }
1799
1800 module_init(ether1394_init_module);
1801 module_exit(ether1394_exit_module);