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   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/unaligned.h>
  68 #include <net/arp.h>
  69
  70 #include "config_roms.h"
  71 #include "csr1212.h"
  72 #include "eth1394.h"
  73 #include "highlevel.h"
  74 #include "ieee1394.h"
  75 #include "ieee1394_core.h"
  76 #include "ieee1394_hotplug.h"
  77 #include "ieee1394_transactions.h"
  78 #include "ieee1394_types.h"
  79 #include "iso.h"
  80 #include "nodemgr.h"
  81
  82 #define ETH1394_PRINT_G(level, fmt, args...) \
  83         printk(level "%s: " fmt, driver_name, ## args)
  84
  85 #define ETH1394_PRINT(level, dev_name, fmt, args...) \
  86         printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
  87
  88 #define DEBUG(fmt, args...) \
  89         printk(KERN_ERR "%s:%s[%d]: " fmt "\n", driver_name, __FUNCTION__, __LINE__, ## args)
  90 #define TRACE() printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)
  91
  92 struct fragment_info {
  93         struct list_head list;
  94         int offset;
  95         int len;
  96 };
  97
  98 struct partial_datagram {
  99         struct list_head list;
 100         u16 dgl;
 101         u16 dg_size;
 102         u16 ether_type;
 103         struct sk_buff *skb;
 104         char *pbuf;
 105         struct list_head frag_info;
 106 };
 107
 108 struct pdg_list {
 109         struct list_head list;          /* partial datagram list per node       */
 110         unsigned int sz;                /* partial datagram list size per node  */
 111         spinlock_t lock;                /* partial datagram lock                */
 112 };
 113
 114 struct eth1394_host_info {
 115         struct hpsb_host *host;
 116         struct net_device *dev;
 117 };
 118
 119 struct eth1394_node_ref {
 120         struct unit_directory *ud;
 121         struct list_head list;
 122 };
 123
 124 struct eth1394_node_info {
 125         u16 maxpayload;                 /* Max payload                  */
 126         u8 sspd;                        /* Max speed                    */
 127         u64 fifo;                       /* FIFO address                 */
 128         struct pdg_list pdg;            /* partial RX datagram lists    */
 129         int dgl;                        /* Outgoing datagram label      */
 130 };
 131
 132 /* Our ieee1394 highlevel driver */
 133 #define ETH1394_DRIVER_NAME "eth1394"
 134 static const char driver_name[] = ETH1394_DRIVER_NAME;
 135
 136 static struct kmem_cache *packet_task_cache;
 137
 138 static struct hpsb_highlevel eth1394_highlevel;
 139
 140 /* Use common.lf to determine header len */
 141 static const int hdr_type_len[] = {
 142         sizeof (struct eth1394_uf_hdr),
 143         sizeof (struct eth1394_ff_hdr),
 144         sizeof (struct eth1394_sf_hdr),
 145         sizeof (struct eth1394_sf_hdr)
 146 };
 147
 148 /* Change this to IEEE1394_SPEED_S100 to make testing easier */
 149 #define ETH1394_SPEED_DEF       IEEE1394_SPEED_MAX
 150
 151 /* For now, this needs to be 1500, so that XP works with us */
 152 #define ETH1394_DATA_LEN        ETH_DATA_LEN
 153
 154 static const u16 eth1394_speedto_maxpayload[] = {
 155 /*     S100, S200, S400, S800, S1600, S3200 */
 156         512, 1024, 2048, 4096,  4096,  4096
 157 };
 158
 159 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
 160 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
 161 MODULE_LICENSE("GPL");
 162
 163 /* The max_partial_datagrams parameter is the maximum number of fragmented
 164  * datagrams per node that eth1394 will keep in memory.  Providing an upper
 165  * bound allows us to limit the amount of memory that partial datagrams
 166  * consume in the event that some partial datagrams are never completed.
 167  */
 168 static int max_partial_datagrams = 25;
 169 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
 170 MODULE_PARM_DESC(max_partial_datagrams,
 171                  "Maximum number of partially received fragmented datagrams "
 172                  "(default = 25).");
 173
 174
 175 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 176                             unsigned short type, void *daddr, void *saddr,
 177                             unsigned len);
 178 static int ether1394_rebuild_header(struct sk_buff *skb);
 179 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
 180 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 181 static void ether1394_header_cache_update(struct hh_cache *hh,
 182                                           struct net_device *dev,
 183                                           unsigned char * haddr);
 184 static int ether1394_mac_addr(struct net_device *dev, void *p);
 185
 186 static void purge_partial_datagram(struct list_head *old);
 187 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 188 static void ether1394_iso(struct hpsb_iso *iso);
 189
 190 static struct ethtool_ops ethtool_ops;
 191
 192 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 193                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 194 static void ether1394_add_host (struct hpsb_host *host);
 195 static void ether1394_remove_host (struct hpsb_host *host);
 196 static void ether1394_host_reset (struct hpsb_host *host);
 197
 198 /* Function for incoming 1394 packets */
 199 static struct hpsb_address_ops addr_ops = {
 200         .write =        ether1394_write,
 201 };
 202
 203 /* Ieee1394 highlevel driver functions */
 204 static struct hpsb_highlevel eth1394_highlevel = {
 205         .name =         driver_name,
 206         .add_host =     ether1394_add_host,
 207         .remove_host =  ether1394_remove_host,
 208         .host_reset =   ether1394_host_reset,
 209 };
 210
 211
 212 /* This is called after an "ifup" */
 213 static int ether1394_open (struct net_device *dev)
 214 {
 215         struct eth1394_priv *priv = netdev_priv(dev);
 216         int ret = 0;
 217
 218         /* Something bad happened, don't even try */
 219         if (priv->bc_state == ETHER1394_BC_ERROR) {
 220                 /* we'll try again */
 221                 priv->iso = hpsb_iso_recv_init(priv->host,
 222                                                ETHER1394_ISO_BUF_SIZE,
 223                                                ETHER1394_GASP_BUFFERS,
 224                                                priv->broadcast_channel,
 225                                                HPSB_ISO_DMA_PACKET_PER_BUFFER,
 226                                                1, ether1394_iso);
 227                 if (priv->iso == NULL) {
 228                         ETH1394_PRINT(KERN_ERR, dev->name,
 229                                       "Could not allocate isochronous receive "
 230                                       "context for the broadcast channel\n");
 231                         priv->bc_state = ETHER1394_BC_ERROR;
 232                         ret = -EAGAIN;
 233                 } else {
 234                         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 235                                 priv->bc_state = ETHER1394_BC_STOPPED;
 236                         else
 237                                 priv->bc_state = ETHER1394_BC_RUNNING;
 238                 }
 239         }
 240
 241         if (ret)
 242                 return ret;
 243
 244         netif_start_queue (dev);
 245         return 0;
 246 }
 247
 248 /* This is called after an "ifdown" */
 249 static int ether1394_stop (struct net_device *dev)
 250 {
 251         netif_stop_queue (dev);
 252         return 0;
 253 }
 254
 255 /* Return statistics to the caller */
 256 static struct net_device_stats *ether1394_stats (struct net_device *dev)
 257 {
 258         return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
 259 }
 260
 261 /* What to do if we timeout. I think a host reset is probably in order, so
 262  * that's what we do. Should we increment the stat counters too?  */
 263 static void ether1394_tx_timeout (struct net_device *dev)
 264 {
 265         ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
 266                        ((struct eth1394_priv *)netdev_priv(dev))->host->driver->name);
 267
 268         highlevel_host_reset (((struct eth1394_priv *)netdev_priv(dev))->host);
 269
 270         netif_wake_queue (dev);
 271 }
 272
 273 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 274 {
 275         struct eth1394_priv *priv = netdev_priv(dev);
 276
 277         if ((new_mtu < 68) ||
 278             (new_mtu > min(ETH1394_DATA_LEN,
 279                            (int)((1 << (priv->host->csr.max_rec + 1)) -
 280                                  (sizeof(union eth1394_hdr) +
 281                                   ETHER1394_GASP_OVERHEAD)))))
 282                 return -EINVAL;
 283         dev->mtu = new_mtu;
 284         return 0;
 285 }
 286
 287 static void purge_partial_datagram(struct list_head *old)
 288 {
 289         struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
 290         struct list_head *lh, *n;
 291
 292         list_for_each_safe(lh, n, &pd->frag_info) {
 293                 struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
 294                 list_del(lh);
 295                 kfree(fi);
 296         }
 297         list_del(old);
 298         kfree_skb(pd->skb);
 299         kfree(pd);
 300 }
 301
 302 /******************************************
 303  * 1394 bus activity functions
 304  ******************************************/
 305
 306 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 307                                                   struct unit_directory *ud)
 308 {
 309         struct eth1394_node_ref *node;
 310
 311         list_for_each_entry(node, inl, list)
 312                 if (node->ud == ud)
 313                         return node;
 314
 315         return NULL;
 316 }
 317
 318 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 319                                                        u64 guid)
 320 {
 321         struct eth1394_node_ref *node;
 322
 323         list_for_each_entry(node, inl, list)
 324                 if (node->ud->ne->guid == guid)
 325                         return node;
 326
 327         return NULL;
 328 }
 329
 330 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 331                                                          nodeid_t nodeid)
 332 {
 333         struct eth1394_node_ref *node;
 334         list_for_each_entry(node, inl, list) {
 335                 if (node->ud->ne->nodeid == nodeid)
 336                         return node;
 337         }
 338
 339         return NULL;
 340 }
 341
 342 static int eth1394_probe(struct device *dev)
 343 {
 344         struct unit_directory *ud;
 345         struct eth1394_host_info *hi;
 346         struct eth1394_priv *priv;
 347         struct eth1394_node_ref *new_node;
 348         struct eth1394_node_info *node_info;
 349
 350         ud = container_of(dev, struct unit_directory, device);
 351
 352         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 353         if (!hi)
 354                 return -ENOENT;
 355
 356         new_node = kmalloc(sizeof(*new_node),
 357                            in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 358         if (!new_node)
 359                 return -ENOMEM;
 360
 361         node_info = kmalloc(sizeof(*node_info),
 362                             in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 363         if (!node_info) {
 364                 kfree(new_node);
 365                 return -ENOMEM;
 366         }
 367
 368         spin_lock_init(&node_info->pdg.lock);
 369         INIT_LIST_HEAD(&node_info->pdg.list);
 370         node_info->pdg.sz = 0;
 371         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 372
 373         ud->device.driver_data = node_info;
 374         new_node->ud = ud;
 375
 376         priv = netdev_priv(hi->dev);
 377         list_add_tail(&new_node->list, &priv->ip_node_list);
 378
 379         return 0;
 380 }
 381
 382 static int eth1394_remove(struct device *dev)
 383 {
 384         struct unit_directory *ud;
 385         struct eth1394_host_info *hi;
 386         struct eth1394_priv *priv;
 387         struct eth1394_node_ref *old_node;
 388         struct eth1394_node_info *node_info;
 389         struct list_head *lh, *n;
 390         unsigned long flags;
 391
 392         ud = container_of(dev, struct unit_directory, device);
 393         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 394         if (!hi)
 395                 return -ENOENT;
 396
 397         priv = netdev_priv(hi->dev);
 398
 399         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 400
 401         if (old_node) {
 402                 list_del(&old_node->list);
 403                 kfree(old_node);
 404
 405                 node_info = (struct eth1394_node_info*)ud->device.driver_data;
 406
 407                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 408                 /* The partial datagram list should be empty, but we'll just
 409                  * make sure anyway... */
 410                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 411                         purge_partial_datagram(lh);
 412                 }
 413                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 414
 415                 kfree(node_info);
 416                 ud->device.driver_data = NULL;
 417         }
 418         return 0;
 419 }
 420
 421 static int eth1394_update(struct unit_directory *ud)
 422 {
 423         struct eth1394_host_info *hi;
 424         struct eth1394_priv *priv;
 425         struct eth1394_node_ref *node;
 426         struct eth1394_node_info *node_info;
 427
 428         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 429         if (!hi)
 430                 return -ENOENT;
 431
 432         priv = netdev_priv(hi->dev);
 433
 434         node = eth1394_find_node(&priv->ip_node_list, ud);
 435
 436         if (!node) {
 437                 node = kmalloc(sizeof(*node),
 438                                in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 439                 if (!node)
 440                         return -ENOMEM;
 441
 442                 node_info = kmalloc(sizeof(*node_info),
 443                                     in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
 444                 if (!node_info) {
 445                         kfree(node);
 446                         return -ENOMEM;
 447                 }
 448
 449                 spin_lock_init(&node_info->pdg.lock);
 450                 INIT_LIST_HEAD(&node_info->pdg.list);
 451                 node_info->pdg.sz = 0;
 452
 453                 ud->device.driver_data = node_info;
 454                 node->ud = ud;
 455
 456                 priv = netdev_priv(hi->dev);
 457                 list_add_tail(&node->list, &priv->ip_node_list);
 458         }
 459
 460         return 0;
 461 }
 462
 463
 464 static struct ieee1394_device_id eth1394_id_table[] = {
 465         {
 466                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 467                                 IEEE1394_MATCH_VERSION),
 468                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 469                 .version = ETHER1394_GASP_VERSION,
 470         },
 471         {}
 472 };
 473
 474 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 475
 476 static struct hpsb_protocol_driver eth1394_proto_driver = {
 477         .name           = "IPv4 over 1394 Driver",
 478         .id_table       = eth1394_id_table,
 479         .update         = eth1394_update,
 480         .driver         = {
 481                 .name           = ETH1394_DRIVER_NAME,
 482                 .bus            = &ieee1394_bus_type,
 483                 .probe          = eth1394_probe,
 484                 .remove         = eth1394_remove,
 485         },
 486 };
 487
 488
 489 static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
 490 {
 491         unsigned long flags;
 492         int i;
 493         struct eth1394_priv *priv = netdev_priv(dev);
 494         struct hpsb_host *host = priv->host;
 495         u64 guid = get_unaligned((u64*)&(host->csr.rom->bus_info_data[3]));
 496         u16 maxpayload = 1 << (host->csr.max_rec + 1);
 497         int max_speed = IEEE1394_SPEED_MAX;
 498
 499         spin_lock_irqsave (&priv->lock, flags);
 500
 501         memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
 502         priv->bc_maxpayload = 512;
 503
 504         /* Determine speed limit */
 505         for (i = 0; i < host->node_count; i++)
 506                 if (max_speed > host->speed[i])
 507                         max_speed = host->speed[i];
 508         priv->bc_sspd = max_speed;
 509
 510         /* We'll use our maxpayload as the default mtu */
 511         if (set_mtu) {
 512                 dev->mtu = min(ETH1394_DATA_LEN,
 513                                (int)(maxpayload -
 514                                      (sizeof(union eth1394_hdr) +
 515                                       ETHER1394_GASP_OVERHEAD)));
 516
 517                 /* Set our hardware address while we're at it */
 518                 memcpy(dev->dev_addr, &guid, sizeof(u64));
 519                 memset(dev->broadcast, 0xff, sizeof(u64));
 520         }
 521
 522         spin_unlock_irqrestore (&priv->lock, flags);
 523 }
 524
 525 /* This function is called right before register_netdev */
 526 static void ether1394_init_dev (struct net_device *dev)
 527 {
 528         /* Our functions */
 529         dev->open               = ether1394_open;
 530         dev->stop               = ether1394_stop;
 531         dev->hard_start_xmit    = ether1394_tx;
 532         dev->get_stats          = ether1394_stats;
 533         dev->tx_timeout         = ether1394_tx_timeout;
 534         dev->change_mtu         = ether1394_change_mtu;
 535
 536         dev->hard_header        = ether1394_header;
 537         dev->rebuild_header     = ether1394_rebuild_header;
 538         dev->hard_header_cache  = ether1394_header_cache;
 539         dev->header_cache_update= ether1394_header_cache_update;
 540         dev->hard_header_parse  = ether1394_header_parse;
 541         dev->set_mac_address    = ether1394_mac_addr;
 542         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 543
 544         /* Some constants */
 545         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 546         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 547         dev->features           = NETIF_F_HIGHDMA;
 548         dev->addr_len           = ETH1394_ALEN;
 549         dev->hard_header_len    = ETH1394_HLEN;
 550         dev->type               = ARPHRD_IEEE1394;
 551
 552         ether1394_reset_priv (dev, 1);
 553 }
 554
 555 /*
 556  * This function is called every time a card is found. It is generally called
 557  * when the module is installed. This is where we add all of our ethernet
 558  * devices. One for each host.
 559  */
 560 static void ether1394_add_host (struct hpsb_host *host)
 561 {
 562         struct eth1394_host_info *hi = NULL;
 563         struct net_device *dev = NULL;
 564         struct eth1394_priv *priv;
 565         u64 fifo_addr;
 566
 567         if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
 568                 return;
 569
 570         fifo_addr = hpsb_allocate_and_register_addrspace(
 571                         &eth1394_highlevel, host, &addr_ops,
 572                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 573                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 574         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE)
 575                 goto out;
 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         SET_NETDEV_DEV(dev, &host->device);
 591
 592         priv = netdev_priv(dev);
 593
 594         INIT_LIST_HEAD(&priv->ip_node_list);
 595
 596         spin_lock_init(&priv->lock);
 597         priv->host = host;
 598         priv->local_fifo = fifo_addr;
 599
 600         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 601
 602         if (hi == NULL) {
 603                 ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
 604                                  "hostinfo for IEEE 1394 device %s-%d\n",
 605                                  host->driver->name, host->id);
 606                 goto out;
 607         }
 608
 609         ether1394_init_dev(dev);
 610
 611         if (register_netdev (dev)) {
 612                 ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
 613                 goto out;
 614         }
 615
 616         ETH1394_PRINT (KERN_INFO, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet (fw-host%d)\n",
 617                        host->id);
 618
 619         hi->host = host;
 620         hi->dev = dev;
 621
 622         /* Ignore validity in hopes that it will be set in the future.  It'll
 623          * be checked when the eth device is opened. */
 624         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 625
 626         priv->iso = hpsb_iso_recv_init(host,
 627                                        ETHER1394_ISO_BUF_SIZE,
 628                                        ETHER1394_GASP_BUFFERS,
 629                                        priv->broadcast_channel,
 630                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 631                                        1, ether1394_iso);
 632         if (priv->iso == NULL) {
 633                 ETH1394_PRINT(KERN_ERR, dev->name,
 634                               "Could not allocate isochronous receive context "
 635                               "for the broadcast channel\n");
 636                 priv->bc_state = ETHER1394_BC_ERROR;
 637         } else {
 638                 if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 639                         priv->bc_state = ETHER1394_BC_STOPPED;
 640                 else
 641                         priv->bc_state = ETHER1394_BC_RUNNING;
 642         }
 643
 644         return;
 645
 646 out:
 647         if (dev != NULL)
 648                 free_netdev(dev);
 649         if (hi)
 650                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 651
 652         return;
 653 }
 654
 655 /* Remove a card from our list */
 656 static void ether1394_remove_host (struct hpsb_host *host)
 657 {
 658         struct eth1394_host_info *hi;
 659
 660         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 661         if (hi != NULL) {
 662                 struct eth1394_priv *priv = netdev_priv(hi->dev);
 663
 664                 hpsb_unregister_addrspace(&eth1394_highlevel, host,
 665                                           priv->local_fifo);
 666
 667                 if (priv->iso != NULL)
 668                         hpsb_iso_shutdown(priv->iso);
 669
 670                 if (hi->dev) {
 671                         unregister_netdev (hi->dev);
 672                         free_netdev(hi->dev);
 673                 }
 674         }
 675
 676         return;
 677 }
 678
 679 /* A reset has just arisen */
 680 static void ether1394_host_reset (struct hpsb_host *host)
 681 {
 682         struct eth1394_host_info *hi;
 683         struct eth1394_priv *priv;
 684         struct net_device *dev;
 685         struct list_head *lh, *n;
 686         struct eth1394_node_ref *node;
 687         struct eth1394_node_info *node_info;
 688         unsigned long flags;
 689
 690         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 691
 692         /* This can happen for hosts that we don't use */
 693         if (hi == NULL)
 694                 return;
 695
 696         dev = hi->dev;
 697         priv = (struct eth1394_priv *)netdev_priv(dev);
 698
 699         /* Reset our private host data, but not our mtu */
 700         netif_stop_queue (dev);
 701         ether1394_reset_priv (dev, 0);
 702
 703         list_for_each_entry(node, &priv->ip_node_list, list) {
 704                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 705
 706                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 707
 708                 list_for_each_safe(lh, n, &node_info->pdg.list) {
 709                         purge_partial_datagram(lh);
 710                 }
 711
 712                 INIT_LIST_HEAD(&(node_info->pdg.list));
 713                 node_info->pdg.sz = 0;
 714
 715                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 716         }
 717
 718         netif_wake_queue (dev);
 719 }
 720
 721 /******************************************
 722  * HW Header net device functions
 723  ******************************************/
 724 /* These functions have been adapted from net/ethernet/eth.c */
 725
 726
 727 /* Create a fake MAC header for an arbitrary protocol layer.
 728  * saddr=NULL means use device source address
 729  * daddr=NULL means leave destination address (eg unresolved arp). */
 730 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 731                             unsigned short type, void *daddr, void *saddr,
 732                             unsigned len)
 733 {
 734         struct eth1394hdr *eth = (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 735
 736         eth->h_proto = htons(type);
 737
 738         if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) {
 739                 memset(eth->h_dest, 0, dev->addr_len);
 740                 return(dev->hard_header_len);
 741         }
 742
 743         if (daddr) {
 744                 memcpy(eth->h_dest,daddr,dev->addr_len);
 745                 return dev->hard_header_len;
 746         }
 747
 748         return -dev->hard_header_len;
 749
 750 }
 751
 752
 753 /* Rebuild the faked MAC header. This is called after an ARP
 754  * (or in future other address resolution) has completed on this
 755  * sk_buff. We now let ARP fill in the other fields.
 756  *
 757  * This routine CANNOT use cached dst->neigh!
 758  * Really, it is used only when dst->neigh is wrong.
 759  */
 760 static int ether1394_rebuild_header(struct sk_buff *skb)
 761 {
 762         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 763         struct net_device *dev = skb->dev;
 764
 765         switch (eth->h_proto) {
 766
 767 #ifdef CONFIG_INET
 768         case __constant_htons(ETH_P_IP):
 769                 return arp_find((unsigned char*)&eth->h_dest, skb);
 770 #endif
 771         default:
 772                 ETH1394_PRINT(KERN_DEBUG, dev->name,
 773                               "unable to resolve type %04x addresses.\n",
 774                               ntohs(eth->h_proto));
 775                 break;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
 782 {
 783         struct net_device *dev = skb->dev;
 784         memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
 785         return ETH1394_ALEN;
 786 }
 787
 788
 789 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 790 {
 791         unsigned short type = hh->hh_type;
 792         struct eth1394hdr *eth = (struct eth1394hdr*)(((u8*)hh->hh_data) +
 793                                                       (16 - ETH1394_HLEN));
 794         struct net_device *dev = neigh->dev;
 795
 796         if (type == htons(ETH_P_802_3))
 797                 return -1;
 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 = eth1394_hdr(skb);
 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 = netdev_priv(dev);
 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 == 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                 __be64 guid;
 899
 900                 /* Sanity check. MacOSX seems to be sending us 131 in this
 901                  * field (atleast on my Panther G5). Not sure why. */
 902                 if (sspd > 5 || sspd < 0)
 903                         sspd = 0;
 904
 905                 maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
 906
 907                 guid = get_unaligned(&arp1394->s_uniq_id);
 908                 node = eth1394_find_node_guid(&priv->ip_node_list,
 909                                               be64_to_cpu(guid));
 910                 if (!node) {
 911                         return 0;
 912                 }
 913
 914                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
 915
 916                 /* Update our speed/payload/fifo_offset table */
 917                 node_info->maxpayload = maxpayload;
 918                 node_info->sspd =       sspd;
 919                 node_info->fifo =       fifo_addr;
 920
 921                 /* Now that we're done with the 1394 specific stuff, we'll
 922                  * need to alter some of the data.  Believe it or not, all
 923                  * that needs to be done is sender_IP_address needs to be
 924                  * moved, the destination hardware address get stuffed
 925                  * in and the hardware address length set to 8.
 926                  *
 927                  * IMPORTANT: The code below overwrites 1394 specific data
 928                  * needed above so keep the munging of the data for the
 929                  * higher level IP stack last. */
 930
 931                 arp->ar_hln = 8;
 932                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 933                 *(u32*)arp_ptr = arp1394->sip;  /* move sender IP addr */
 934                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 935
 936                 if (arp->ar_op == htons(ARPOP_REQUEST))
 937                         memset(arp_ptr, 0, sizeof(u64));
 938                 else
 939                         memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
 940         }
 941
 942         /* Now add the ethernet header. */
 943         if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 944                              skb->len) >= 0)
 945                 ret = ether1394_type_trans(skb, dev);
 946
 947         return ret;
 948 }
 949
 950 static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
 951 {
 952         struct fragment_info *fi;
 953
 954         list_for_each_entry(fi, frag_list, list) {
 955                 if ( ! ((offset > (fi->offset + fi->len - 1)) ||
 956                        ((offset + len - 1) < fi->offset)))
 957                         return 1;
 958         }
 959         return 0;
 960 }
 961
 962 static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 963 {
 964         struct partial_datagram *pd;
 965
 966         list_for_each_entry(pd, pdgl, list) {
 967                 if (pd->dgl == dgl)
 968                         return &pd->list;
 969         }
 970         return NULL;
 971 }
 972
 973 /* Assumes that new fragment does not overlap any existing fragments */
 974 static inline int new_fragment(struct list_head *frag_info, int offset, int len)
 975 {
 976         struct list_head *lh;
 977         struct fragment_info *fi, *fi2, *new;
 978
 979         list_for_each(lh, frag_info) {
 980                 fi = list_entry(lh, struct fragment_info, list);
 981                 if ((fi->offset + fi->len) == offset) {
 982                         /* The new fragment can be tacked on to the end */
 983                         fi->len += len;
 984                         /* Did the new fragment plug a hole? */
 985                         fi2 = list_entry(lh->next, struct fragment_info, list);
 986                         if ((fi->offset + fi->len) == fi2->offset) {
 987                                 /* glue fragments together */
 988                                 fi->len += fi2->len;
 989                                 list_del(lh->next);
 990                                 kfree(fi2);
 991                         }
 992                         return 0;
 993                 } else if ((offset + len) == fi->offset) {
 994                         /* The new fragment can be tacked on to the beginning */
 995                         fi->offset = offset;
 996                         fi->len += len;
 997                         /* Did the new fragment plug a hole? */
 998                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 999                         if ((fi2->offset + fi2->len) == fi->offset) {
1000                                 /* glue fragments together */
1001                                 fi2->len += fi->len;
1002                                 list_del(lh);
1003                                 kfree(fi);
1004                         }
1005                         return 0;
1006                 } else if (offset > (fi->offset + fi->len)) {
1007                         break;
1008                 } else if ((offset + len) < fi->offset) {
1009                         lh = lh->prev;
1010                         break;
1011                 }
1012         }
1013
1014         new = kmalloc(sizeof(*new), GFP_ATOMIC);
1015         if (!new)
1016                 return -ENOMEM;
1017
1018         new->offset = offset;
1019         new->len = len;
1020
1021         list_add(&new->list, lh);
1022
1023         return 0;
1024 }
1025
1026 static inline int new_partial_datagram(struct net_device *dev,
1027                                        struct list_head *pdgl, int dgl,
1028                                        int dg_size, char *frag_buf,
1029                                        int frag_off, int frag_len)
1030 {
1031         struct partial_datagram *new;
1032
1033         new = kmalloc(sizeof(*new), GFP_ATOMIC);
1034         if (!new)
1035                 return -ENOMEM;
1036
1037         INIT_LIST_HEAD(&new->frag_info);
1038
1039         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1040                 kfree(new);
1041                 return -ENOMEM;
1042         }
1043
1044         new->dgl = dgl;
1045         new->dg_size = dg_size;
1046
1047         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1048         if (!new->skb) {
1049                 struct fragment_info *fi = list_entry(new->frag_info.next,
1050                                                       struct fragment_info,
1051                                                       list);
1052                 kfree(fi);
1053                 kfree(new);
1054                 return -ENOMEM;
1055         }
1056
1057         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1058         new->pbuf = skb_put(new->skb, dg_size);
1059         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1060
1061         list_add(&new->list, pdgl);
1062
1063         return 0;
1064 }
1065
1066 static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1067                                           char *frag_buf, int frag_off, int frag_len)
1068 {
1069         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1070
1071         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
1072                 return -ENOMEM;
1073         }
1074
1075         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1076
1077         /* Move list entry to beginnig of list so that oldest partial
1078          * datagrams percolate to the end of the list */
1079         list_move(lh, pdgl);
1080
1081         return 0;
1082 }
1083
1084 static inline int is_datagram_complete(struct list_head *lh, int dg_size)
1085 {
1086         struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
1087         struct fragment_info *fi = list_entry(pd->frag_info.next,
1088                                               struct fragment_info, list);
1089
1090         return (fi->len == dg_size);
1091 }
1092
1093 /* Packet reception. We convert the IP1394 encapsulation header to an
1094  * ethernet header, and fill it with some of our other fields. This is
1095  * an incoming packet from the 1394 bus.  */
1096 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1097                                   char *buf, int len)
1098 {
1099         struct sk_buff *skb;
1100         unsigned long flags;
1101         struct eth1394_priv *priv = netdev_priv(dev);
1102         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1103         u16 ether_type = 0;  /* initialized to clear warning */
1104         int hdr_len;
1105         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1106         struct eth1394_node_info *node_info;
1107
1108         if (!ud) {
1109                 struct eth1394_node_ref *node;
1110                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1111                 if (!node) {
1112                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1113                                    "lookup failure: " NODE_BUS_FMT,
1114                                    NODE_BUS_ARGS(priv->host, srcid));
1115                         priv->stats.rx_dropped++;
1116                         return -1;
1117                 }
1118                 ud = node->ud;
1119
1120                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1121         }
1122
1123         node_info = (struct eth1394_node_info*)ud->device.driver_data;
1124
1125         /* First, did we receive a fragmented or unfragmented datagram? */
1126         hdr->words.word1 = ntohs(hdr->words.word1);
1127
1128         hdr_len = hdr_type_len[hdr->common.lf];
1129
1130         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1131                 /* An unfragmented datagram has been received by the ieee1394
1132                  * bus. Build an skbuff around it so we can pass it to the
1133                  * high level network layer. */
1134
1135                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1136                 if (!skb) {
1137                         HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
1138                         priv->stats.rx_dropped++;
1139                         return -1;
1140                 }
1141                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1142                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
1143                 ether_type = hdr->uf.ether_type;
1144         } else {
1145                 /* A datagram fragment has been received, now the fun begins. */
1146
1147                 struct list_head *pdgl, *lh;
1148                 struct partial_datagram *pd;
1149                 int fg_off;
1150                 int fg_len = len - hdr_len;
1151                 int dg_size;
1152                 int dgl;
1153                 int retval;
1154                 struct pdg_list *pdg = &(node_info->pdg);
1155
1156                 hdr->words.word3 = ntohs(hdr->words.word3);
1157                 /* The 4th header word is reserved so no need to do ntohs() */
1158
1159                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1160                         ether_type = hdr->ff.ether_type;
1161                         dgl = hdr->ff.dgl;
1162                         dg_size = hdr->ff.dg_size + 1;
1163                         fg_off = 0;
1164                 } else {
1165                         hdr->words.word2 = ntohs(hdr->words.word2);
1166                         dgl = hdr->sf.dgl;
1167                         dg_size = hdr->sf.dg_size + 1;
1168                         fg_off = hdr->sf.fg_off;
1169                 }
1170                 spin_lock_irqsave(&pdg->lock, flags);
1171
1172                 pdgl = &(pdg->list);
1173                 lh = find_partial_datagram(pdgl, dgl);
1174
1175                 if (lh == NULL) {
1176                         while (pdg->sz >= max_partial_datagrams) {
1177                                 /* remove the oldest */
1178                                 purge_partial_datagram(pdgl->prev);
1179                                 pdg->sz--;
1180                         }
1181
1182                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1183                                                       buf + hdr_len, fg_off,
1184                                                       fg_len);
1185                         if (retval < 0) {
1186                                 spin_unlock_irqrestore(&pdg->lock, flags);
1187                                 goto bad_proto;
1188                         }
1189                         pdg->sz++;
1190                         lh = find_partial_datagram(pdgl, dgl);
1191                 } else {
1192                         struct partial_datagram *pd;
1193
1194                         pd = list_entry(lh, struct partial_datagram, list);
1195
1196                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1197                                 /* Overlapping fragments, obliterate old
1198                                  * datagram and start new one. */
1199                                 purge_partial_datagram(lh);
1200                                 retval = new_partial_datagram(dev, pdgl, dgl,
1201                                                               dg_size,
1202                                                               buf + hdr_len,
1203                                                               fg_off, fg_len);
1204                                 if (retval < 0) {
1205                                         pdg->sz--;
1206                                         spin_unlock_irqrestore(&pdg->lock, flags);
1207                                         goto bad_proto;
1208                                 }
1209                         } else {
1210                                 retval = update_partial_datagram(pdgl, lh,
1211                                                                  buf + hdr_len,
1212                                                                  fg_off, fg_len);
1213                                 if (retval < 0) {
1214                                         /* Couldn't save off fragment anyway
1215                                          * so might as well obliterate the
1216                                          * datagram now. */
1217                                         purge_partial_datagram(lh);
1218                                         pdg->sz--;
1219                                         spin_unlock_irqrestore(&pdg->lock, flags);
1220                                         goto bad_proto;
1221                                 }
1222                         } /* fragment overlap */
1223                 } /* new datagram or add to existing one */
1224
1225                 pd = list_entry(lh, struct partial_datagram, list);
1226
1227                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1228                         pd->ether_type = ether_type;
1229                 }
1230
1231                 if (is_datagram_complete(lh, dg_size)) {
1232                         ether_type = pd->ether_type;
1233                         pdg->sz--;
1234                         skb = skb_get(pd->skb);
1235                         purge_partial_datagram(lh);
1236                         spin_unlock_irqrestore(&pdg->lock, flags);
1237                 } else {
1238                         /* Datagram is not complete, we're done for the
1239                          * moment. */
1240                         spin_unlock_irqrestore(&pdg->lock, flags);
1241                         return 0;
1242                 }
1243         } /* unframgented datagram or fragmented one */
1244
1245         /* Write metadata, and then pass to the receive level */
1246         skb->dev = dev;
1247         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1248
1249         /* Parse the encapsulation header. This actually does the job of
1250          * converting to an ethernet frame header, aswell as arp
1251          * conversion if needed. ARP conversion is easier in this
1252          * direction, since we are using ethernet as our backend.  */
1253         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1254                                               ether_type);
1255
1256
1257         spin_lock_irqsave(&priv->lock, flags);
1258         if (!skb->protocol) {
1259                 priv->stats.rx_errors++;
1260                 priv->stats.rx_dropped++;
1261                 dev_kfree_skb_any(skb);
1262                 goto bad_proto;
1263         }
1264
1265         if (netif_rx(skb) == NET_RX_DROP) {
1266                 priv->stats.rx_errors++;
1267                 priv->stats.rx_dropped++;
1268                 goto bad_proto;
1269         }
1270
1271         /* Statistics */
1272         priv->stats.rx_packets++;
1273         priv->stats.rx_bytes += skb->len;
1274
1275 bad_proto:
1276         if (netif_queue_stopped(dev))
1277                 netif_wake_queue(dev);
1278         spin_unlock_irqrestore(&priv->lock, flags);
1279
1280         dev->last_rx = jiffies;
1281
1282         return 0;
1283 }
1284
1285 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1286                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1287 {
1288         struct eth1394_host_info *hi;
1289
1290         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1291         if (hi == NULL) {
1292                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1293                                 host->driver->name);
1294                 return RCODE_ADDRESS_ERROR;
1295         }
1296
1297         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1298                 return RCODE_ADDRESS_ERROR;
1299         else
1300                 return RCODE_COMPLETE;
1301 }
1302
1303 static void ether1394_iso(struct hpsb_iso *iso)
1304 {
1305         quadlet_t *data;
1306         char *buf;
1307         struct eth1394_host_info *hi;
1308         struct net_device *dev;
1309         struct eth1394_priv *priv;
1310         unsigned int len;
1311         u32 specifier_id;
1312         u16 source_id;
1313         int i;
1314         int nready;
1315
1316         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1317         if (hi == NULL) {
1318                 ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
1319                                 iso->host->driver->name);
1320                 return;
1321         }
1322
1323         dev = hi->dev;
1324
1325         nready = hpsb_iso_n_ready(iso);
1326         for (i = 0; i < nready; i++) {
1327                 struct hpsb_iso_packet_info *info =
1328                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1329                 data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
1330
1331                 /* skip over GASP header */
1332                 buf = (char *)data + 8;
1333                 len = info->len - 8;
1334
1335                 specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
1336                                 ((be32_to_cpu(data[1]) & 0xff000000) >> 24));
1337                 source_id = be32_to_cpu(data[0]) >> 16;
1338
1339                 priv = netdev_priv(dev);
1340
1341                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
1342                    specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1343                         /* This packet is not for us */
1344                         continue;
1345                 }
1346                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1347                                        buf, len);
1348         }
1349
1350         hpsb_iso_recv_release_packets(iso, i);
1351
1352         dev->last_rx = jiffies;
1353 }
1354
1355 /******************************************
1356  * Datagram transmission code
1357  ******************************************/
1358
1359 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1360  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1361  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1362  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1363  * judge.
1364  *
1365  * Now that the EUI is used for the hardware address all we need to do to make
1366  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1367  * speed, and unicast FIFO address information between the sender_unique_id
1368  * and the IP addresses.
1369  */
1370 static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
1371                                             struct net_device *dev)
1372 {
1373         struct eth1394_priv *priv = netdev_priv(dev);
1374
1375         struct arphdr *arp = (struct arphdr *)skb->data;
1376         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1377         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1378
1379         /* Believe it or not, all that need to happen is sender IP get moved
1380          * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
1381         arp1394->hw_addr_len    = 16;
1382         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1383         arp1394->max_rec        = priv->host->csr.max_rec;
1384         arp1394->sspd           = priv->host->csr.lnk_spd;
1385         arp1394->fifo_hi        = htons (priv->local_fifo >> 32);
1386         arp1394->fifo_lo        = htonl (priv->local_fifo & ~0x0);
1387
1388         return;
1389 }
1390
1391 /* We need to encapsulate the standard header with our own. We use the
1392  * ethernet header's proto for our own. */
1393 static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1394                                                       __be16 proto,
1395                                                       union eth1394_hdr *hdr,
1396                                                       u16 dg_size, u16 dgl)
1397 {
1398         unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1399
1400         /* Does it all fit in one packet? */
1401         if (dg_size <= adj_max_payload) {
1402                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1403                 hdr->uf.ether_type = proto;
1404         } else {
1405                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1406                 hdr->ff.ether_type = proto;
1407                 hdr->ff.dg_size = dg_size - 1;
1408                 hdr->ff.dgl = dgl;
1409                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1410         }
1411         return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
1412 }
1413
1414 static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
1415                                                  unsigned int max_payload,
1416                                                  union eth1394_hdr *hdr)
1417 {
1418         union eth1394_hdr *bufhdr;
1419         int ftype = hdr->common.lf;
1420         int hdrsz = hdr_type_len[ftype];
1421         unsigned int adj_max_payload = max_payload - hdrsz;
1422
1423         switch(ftype) {
1424         case ETH1394_HDR_LF_UF:
1425                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1426                 bufhdr->words.word1 = htons(hdr->words.word1);
1427                 bufhdr->words.word2 = hdr->words.word2;
1428                 break;
1429
1430         case ETH1394_HDR_LF_FF:
1431                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1432                 bufhdr->words.word1 = htons(hdr->words.word1);
1433                 bufhdr->words.word2 = hdr->words.word2;
1434                 bufhdr->words.word3 = htons(hdr->words.word3);
1435                 bufhdr->words.word4 = 0;
1436
1437                 /* Set frag type here for future interior fragments */
1438                 hdr->common.lf = ETH1394_HDR_LF_IF;
1439                 hdr->sf.fg_off = 0;
1440                 break;
1441
1442         default:
1443                 hdr->sf.fg_off += adj_max_payload;
1444                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1445                 if (max_payload >= skb->len)
1446                         hdr->common.lf = ETH1394_HDR_LF_LF;
1447                 bufhdr->words.word1 = htons(hdr->words.word1);
1448                 bufhdr->words.word2 = htons(hdr->words.word2);
1449                 bufhdr->words.word3 = htons(hdr->words.word3);
1450                 bufhdr->words.word4 = 0;
1451         }
1452
1453         return min(max_payload, skb->len);
1454 }
1455
1456 static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1457 {
1458         struct hpsb_packet *p;
1459
1460         p = hpsb_alloc_packet(0);
1461         if (p) {
1462                 p->host = host;
1463                 p->generation = get_hpsb_generation(host);
1464                 p->type = hpsb_async;
1465         }
1466         return p;
1467 }
1468
1469 static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
1470                                               struct hpsb_host *host,
1471                                               nodeid_t node, u64 addr,
1472                                               void * data, int tx_len)
1473 {
1474         p->node_id = node;
1475         p->data = NULL;
1476
1477         p->tcode = TCODE_WRITEB;
1478         p->header[1] = (host->node_id << 16) | (addr >> 32);
1479         p->header[2] = addr & 0xffffffff;
1480
1481         p->header_size = 16;
1482         p->expect_response = 1;
1483
1484         if (hpsb_get_tlabel(p)) {
1485                 ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
1486                                 "to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
1487                 return -1;
1488         }
1489         p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
1490                 | (1 << 8) | (TCODE_WRITEB << 4);
1491
1492         p->header[3] = tx_len << 16;
1493         p->data_size = (tx_len + 3) & ~3;
1494         p->data = (quadlet_t*)data;
1495
1496         return 0;
1497 }
1498
1499 static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1500                                               struct eth1394_priv *priv,
1501                                               struct sk_buff *skb, int length)
1502 {
1503         p->header_size = 4;
1504         p->tcode = TCODE_STREAM_DATA;
1505
1506         p->header[0] = (length << 16) | (3 << 14)
1507                 | ((priv->broadcast_channel) << 8)
1508                 | (TCODE_STREAM_DATA << 4);
1509         p->data_size = length;
1510         p->data = ((quadlet_t*)skb->data) - 2;
1511         p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
1512                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1513         p->data[1] = cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
1514                                  ETHER1394_GASP_VERSION);
1515
1516         /* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
1517          * prevents hpsb_send_packet() from setting the speed to an arbitrary
1518          * value based on packet->node_id if packet->node_id is not set. */
1519         p->node_id = ALL_NODES;
1520         p->speed_code = priv->bc_sspd;
1521 }
1522
1523 static inline void ether1394_free_packet(struct hpsb_packet *packet)
1524 {
1525         if (packet->tcode != TCODE_STREAM_DATA)
1526                 hpsb_free_tlabel(packet);
1527         hpsb_free_packet(packet);
1528 }
1529
1530 static void ether1394_complete_cb(void *__ptask);
1531
1532 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1533 {
1534         struct eth1394_priv *priv = ptask->priv;
1535         struct hpsb_packet *packet = NULL;
1536
1537         packet = ether1394_alloc_common_packet(priv->host);
1538         if (!packet)
1539                 return -1;
1540
1541         if (ptask->tx_type == ETH1394_GASP) {
1542                 int length = tx_len + (2 * sizeof(quadlet_t));
1543
1544                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1545         } else if (ether1394_prep_write_packet(packet, priv->host,
1546                                                ptask->dest_node,
1547                                                ptask->addr, ptask->skb->data,
1548                                                tx_len)) {
1549                 hpsb_free_packet(packet);
1550                 return -1;
1551         }
1552
1553         ptask->packet = packet;
1554         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1555                                       ptask);
1556
1557         if (hpsb_send_packet(packet) < 0) {
1558                 ether1394_free_packet(packet);
1559                 return -1;
1560         }
1561
1562         return 0;
1563 }
1564
1565
1566 /* Task function to be run when a datagram transmission is completed */
1567 static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
1568 {
1569         struct sk_buff *skb = ptask->skb;
1570         struct net_device *dev = skb->dev;
1571         struct eth1394_priv *priv = netdev_priv(dev);
1572         unsigned long flags;
1573
1574         /* Statistics */
1575         spin_lock_irqsave(&priv->lock, flags);
1576         if (fail) {
1577                 priv->stats.tx_dropped++;
1578                 priv->stats.tx_errors++;
1579         } else {
1580                 priv->stats.tx_bytes += skb->len;
1581                 priv->stats.tx_packets++;
1582         }
1583         spin_unlock_irqrestore(&priv->lock, flags);
1584
1585         dev_kfree_skb_any(skb);
1586         kmem_cache_free(packet_task_cache, ptask);
1587 }
1588
1589
1590 /* Callback for when a packet has been sent and the status of that packet is
1591  * known */
1592 static void ether1394_complete_cb(void *__ptask)
1593 {
1594         struct packet_task *ptask = (struct packet_task *)__ptask;
1595         struct hpsb_packet *packet = ptask->packet;
1596         int fail = 0;
1597
1598         if (packet->tcode != TCODE_STREAM_DATA)
1599                 fail = hpsb_packet_success(packet);
1600
1601         ether1394_free_packet(packet);
1602
1603         ptask->outstanding_pkts--;
1604         if (ptask->outstanding_pkts > 0 && !fail) {
1605                 int tx_len;
1606
1607                 /* Add the encapsulation header to the fragment */
1608                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1609                                                &ptask->hdr);
1610                 if (ether1394_send_packet(ptask, tx_len))
1611                         ether1394_dg_complete(ptask, 1);
1612         } else {
1613                 ether1394_dg_complete(ptask, fail);
1614         }
1615 }
1616
1617
1618
1619 /* Transmit a packet (called by kernel) */
1620 static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
1621 {
1622         gfp_t kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
1623         struct eth1394hdr *eth;
1624         struct eth1394_priv *priv = netdev_priv(dev);
1625         __be16 proto;
1626         unsigned long flags;
1627         nodeid_t dest_node;
1628         eth1394_tx_type tx_type;
1629         int ret = 0;
1630         unsigned int tx_len;
1631         unsigned int max_payload;
1632         u16 dg_size;
1633         u16 dgl;
1634         struct packet_task *ptask;
1635         struct eth1394_node_ref *node;
1636         struct eth1394_node_info *node_info = NULL;
1637
1638         ptask = kmem_cache_alloc(packet_task_cache, kmflags);
1639         if (ptask == NULL) {
1640                 ret = -ENOMEM;
1641                 goto fail;
1642         }
1643
1644         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1645          * it does not set our validity bit. We need to compensate for
1646          * that somewhere else, but not in eth1394. */
1647 #if 0
1648         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
1649                 ret = -EAGAIN;
1650                 goto fail;
1651         }
1652 #endif
1653
1654         if ((skb = skb_share_check (skb, kmflags)) == NULL) {
1655                 ret = -ENOMEM;
1656                 goto fail;
1657         }
1658
1659         /* Get rid of the fake eth1394 header, but save a pointer */
1660         eth = (struct eth1394hdr*)skb->data;
1661         skb_pull(skb, ETH1394_HLEN);
1662
1663         proto = eth->h_proto;
1664         dg_size = skb->len;
1665
1666         /* Set the transmission type for the packet.  ARP packets and IP
1667          * broadcast packets are sent via GASP. */
1668         if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1669             proto == htons(ETH_P_ARP) ||
1670             (proto == htons(ETH_P_IP) &&
1671              IN_MULTICAST(ntohl(skb->nh.iph->daddr)))) {
1672                 tx_type = ETH1394_GASP;
1673                 dest_node = LOCAL_BUS | ALL_NODES;
1674                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1675                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1676                 dgl = priv->bc_dgl;
1677                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1678                         priv->bc_dgl++;
1679         } else {
1680                 __be64 guid = get_unaligned((u64 *)eth->h_dest);
1681
1682                 node = eth1394_find_node_guid(&priv->ip_node_list,
1683                                               be64_to_cpu(guid));
1684                 if (!node) {
1685                         ret = -EAGAIN;
1686                         goto fail;
1687                 }
1688                 node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
1689                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE) {
1690                         ret = -EAGAIN;
1691                         goto fail;
1692                 }
1693
1694                 dest_node = node->ud->ne->nodeid;
1695                 max_payload = node_info->maxpayload;
1696                 BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
1697
1698                 dgl = node_info->dgl;
1699                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1700                         node_info->dgl++;
1701                 tx_type = ETH1394_WRREQ;
1702         }
1703
1704         /* If this is an ARP packet, convert it */
1705         if (proto == htons(ETH_P_ARP))
1706                 ether1394_arp_to_1394arp (skb, dev);
1707
1708         ptask->hdr.words.word1 = 0;
1709         ptask->hdr.words.word2 = 0;
1710         ptask->hdr.words.word3 = 0;
1711         ptask->hdr.words.word4 = 0;
1712         ptask->skb = skb;
1713         ptask->priv = priv;
1714         ptask->tx_type = tx_type;
1715
1716         if (tx_type != ETH1394_GASP) {
1717                 u64 addr;
1718
1719                 spin_lock_irqsave(&priv->lock, flags);
1720                 addr = node_info->fifo;
1721                 spin_unlock_irqrestore(&priv->lock, flags);
1722
1723                 ptask->addr = addr;
1724                 ptask->dest_node = dest_node;
1725         }
1726
1727         ptask->tx_type = tx_type;
1728         ptask->max_payload = max_payload;
1729         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
1730                                                              &ptask->hdr, dg_size,
1731                                                              dgl);
1732
1733         /* Add the encapsulation header to the fragment */
1734         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1735         dev->trans_start = jiffies;
1736         if (ether1394_send_packet(ptask, tx_len))
1737                 goto fail;
1738
1739         netif_wake_queue(dev);
1740         return 0;
1741 fail:
1742         if (ptask)
1743                 kmem_cache_free(packet_task_cache, ptask);
1744
1745         if (skb != NULL)
1746                 dev_kfree_skb(skb);
1747
1748         spin_lock_irqsave (&priv->lock, flags);
1749         priv->stats.tx_dropped++;
1750         priv->stats.tx_errors++;
1751         spin_unlock_irqrestore (&priv->lock, flags);
1752
1753         if (netif_queue_stopped(dev))
1754                 netif_wake_queue(dev);
1755
1756         return 0;  /* returning non-zero causes serious problems */
1757 }
1758
1759 static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1760 {
1761         strcpy (info->driver, driver_name);
1762         /* FIXME XXX provide sane businfo */
1763         strcpy (info->bus_info, "ieee1394");
1764 }
1765
1766 static struct ethtool_ops ethtool_ops = {
1767         .get_drvinfo = ether1394_get_drvinfo
1768 };
1769
1770 static int __init ether1394_init_module (void)
1771 {
1772         packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
1773                                               0, 0, NULL, NULL);
1774
1775         /* Register ourselves as a highlevel driver */
1776         hpsb_register_highlevel(&eth1394_highlevel);
1777
1778         return hpsb_register_protocol(&eth1394_proto_driver);
1779 }
1780
1781 static void __exit ether1394_exit_module (void)
1782 {
1783         hpsb_unregister_protocol(&eth1394_proto_driver);
1784         hpsb_unregister_highlevel(&eth1394_highlevel);
1785         kmem_cache_destroy(packet_task_cache);
1786 }
1787
1788 module_init(ether1394_init_module);
1789 module_exit(ether1394_exit_module);