drivers/ieee1394/eth1394.c

   1 /*
   2  * eth1394.c -- IPv4 driver for Linux IEEE-1394 Subsystem
   3  *
   4  * Copyright (C) 2001-2003 Ben Collins <bcollins@debian.org>
   5  *               2000 Bonin Franck <boninf@free.fr>
   6  *               2003 Steve Kinneberg <kinnebergsteve@acmsystems.com>
   7  *
   8  * Mainly based on work by Emanuel Pirker and Andreas E. Bombe
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 /*
  26  * This driver intends to support RFC 2734, which describes a method for
  27  * transporting IPv4 datagrams over IEEE-1394 serial busses.
  28  *
  29  * TODO:
  30  * RFC 2734 related:
  31  * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
  32  *
  33  * Non-RFC 2734 related:
  34  * - Handle fragmented skb's coming from the networking layer.
  35  * - Move generic GASP reception to core 1394 code
  36  * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
  37  * - Stability improvements
  38  * - Performance enhancements
  39  * - Consider garbage collecting old partial datagrams after X amount of time
  40  */
  41
  42 #include <linux/module.h>
  43
  44 #include <linux/kernel.h>
  45 #include <linux/slab.h>
  46 #include <linux/errno.h>
  47 #include <linux/types.h>
  48 #include <linux/delay.h>
  49 #include <linux/init.h>
  50 #include <linux/workqueue.h>
  51
  52 #include <linux/netdevice.h>
  53 #include <linux/inetdevice.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/if_ether.h>
  56 #include <linux/ip.h>
  57 #include <linux/in.h>
  58 #include <linux/tcp.h>
  59 #include <linux/skbuff.h>
  60 #include <linux/bitops.h>
  61 #include <linux/ethtool.h>
  62 #include <asm/uaccess.h>
  63 #include <asm/delay.h>
  64 #include <asm/unaligned.h>
  65 #include <net/arp.h>
  66
  67 #include "config_roms.h"
  68 #include "csr1212.h"
  69 #include "eth1394.h"
  70 #include "highlevel.h"
  71 #include "ieee1394.h"
  72 #include "ieee1394_core.h"
  73 #include "ieee1394_hotplug.h"
  74 #include "ieee1394_transactions.h"
  75 #include "ieee1394_types.h"
  76 #include "iso.h"
  77 #include "nodemgr.h"
  78
  79 #define ETH1394_PRINT_G(level, fmt, args...) \
  80         printk(level "%s: " fmt, driver_name, ## args)
  81
  82 #define ETH1394_PRINT(level, dev_name, fmt, args...) \
  83         printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
  84
  85 struct fragment_info {
  86         struct list_head list;
  87         int offset;
  88         int len;
  89 };
  90
  91 struct partial_datagram {
  92         struct list_head list;
  93         u16 dgl;
  94         u16 dg_size;
  95         u16 ether_type;
  96         struct sk_buff *skb;
  97         char *pbuf;
  98         struct list_head frag_info;
  99 };
 100
 101 struct pdg_list {
 102         struct list_head list;  /* partial datagram list per node       */
 103         unsigned int sz;        /* partial datagram list size per node  */
 104         spinlock_t lock;        /* partial datagram lock                */
 105 };
 106
 107 struct eth1394_host_info {
 108         struct hpsb_host *host;
 109         struct net_device *dev;
 110 };
 111
 112 struct eth1394_node_ref {
 113         struct unit_directory *ud;
 114         struct list_head list;
 115 };
 116
 117 struct eth1394_node_info {
 118         u16 maxpayload;         /* max payload                  */
 119         u8 sspd;                /* max speed                    */
 120         u64 fifo;               /* FIFO address                 */
 121         struct pdg_list pdg;    /* partial RX datagram lists    */
 122         int dgl;                /* outgoing datagram label      */
 123 };
 124
 125 static const char driver_name[] = "eth1394";
 126
 127 static struct kmem_cache *packet_task_cache;
 128
 129 static struct hpsb_highlevel eth1394_highlevel;
 130
 131 /* Use common.lf to determine header len */
 132 static const int hdr_type_len[] = {
 133         sizeof(struct eth1394_uf_hdr),
 134         sizeof(struct eth1394_ff_hdr),
 135         sizeof(struct eth1394_sf_hdr),
 136         sizeof(struct eth1394_sf_hdr)
 137 };
 138
 139 static const u16 eth1394_speedto_maxpayload[] = {
 140 /*     S100, S200, S400, S800, S1600, S3200 */
 141         512, 1024, 2048, 4096,  4096,  4096
 142 };
 143
 144 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
 145 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
 146 MODULE_LICENSE("GPL");
 147
 148 /*
 149  * The max_partial_datagrams parameter is the maximum number of fragmented
 150  * datagrams per node that eth1394 will keep in memory.  Providing an upper
 151  * bound allows us to limit the amount of memory that partial datagrams
 152  * consume in the event that some partial datagrams are never completed.
 153  */
 154 static int max_partial_datagrams = 25;
 155 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
 156 MODULE_PARM_DESC(max_partial_datagrams,
 157                  "Maximum number of partially received fragmented datagrams "
 158                  "(default = 25).");
 159
 160
 161 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 162                             unsigned short type, void *daddr, void *saddr,
 163                             unsigned len);
 164 static int ether1394_rebuild_header(struct sk_buff *skb);
 165 static int ether1394_header_parse(const struct sk_buff *skb,
 166                                   unsigned char *haddr);
 167 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
 168 static void ether1394_header_cache_update(struct hh_cache *hh,
 169                                           struct net_device *dev,
 170                                           unsigned char *haddr);
 171 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
 172 static void ether1394_iso(struct hpsb_iso *iso);
 173
 174 static struct ethtool_ops ethtool_ops;
 175
 176 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
 177                            quadlet_t *data, u64 addr, size_t len, u16 flags);
 178 static void ether1394_add_host(struct hpsb_host *host);
 179 static void ether1394_remove_host(struct hpsb_host *host);
 180 static void ether1394_host_reset(struct hpsb_host *host);
 181
 182 /* Function for incoming 1394 packets */
 183 static struct hpsb_address_ops addr_ops = {
 184         .write =        ether1394_write,
 185 };
 186
 187 /* Ieee1394 highlevel driver functions */
 188 static struct hpsb_highlevel eth1394_highlevel = {
 189         .name =         driver_name,
 190         .add_host =     ether1394_add_host,
 191         .remove_host =  ether1394_remove_host,
 192         .host_reset =   ether1394_host_reset,
 193 };
 194
 195 static int ether1394_recv_init(struct eth1394_priv *priv)
 196 {
 197         unsigned int iso_buf_size;
 198
 199         /* FIXME: rawiso limits us to PAGE_SIZE */
 200         iso_buf_size = min((unsigned int)PAGE_SIZE,
 201                            2 * (1U << (priv->host->csr.max_rec + 1)));
 202
 203         priv->iso = hpsb_iso_recv_init(priv->host,
 204                                        ETHER1394_GASP_BUFFERS * iso_buf_size,
 205                                        ETHER1394_GASP_BUFFERS,
 206                                        priv->broadcast_channel,
 207                                        HPSB_ISO_DMA_PACKET_PER_BUFFER,
 208                                        1, ether1394_iso);
 209         if (priv->iso == NULL) {
 210                 ETH1394_PRINT_G(KERN_ERR, "Failed to allocate IR context\n");
 211                 priv->bc_state = ETHER1394_BC_ERROR;
 212                 return -EAGAIN;
 213         }
 214
 215         if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
 216                 priv->bc_state = ETHER1394_BC_STOPPED;
 217         else
 218                 priv->bc_state = ETHER1394_BC_RUNNING;
 219         return 0;
 220 }
 221
 222 /* This is called after an "ifup" */
 223 static int ether1394_open(struct net_device *dev)
 224 {
 225         struct eth1394_priv *priv = netdev_priv(dev);
 226         int ret;
 227
 228         if (priv->bc_state == ETHER1394_BC_ERROR) {
 229                 ret = ether1394_recv_init(priv);
 230                 if (ret)
 231                         return ret;
 232         }
 233         netif_start_queue(dev);
 234         return 0;
 235 }
 236
 237 /* This is called after an "ifdown" */
 238 static int ether1394_stop(struct net_device *dev)
 239 {
 240         /* flush priv->wake */
 241         flush_scheduled_work();
 242
 243         netif_stop_queue(dev);
 244         return 0;
 245 }
 246
 247 /* Return statistics to the caller */
 248 static struct net_device_stats *ether1394_stats(struct net_device *dev)
 249 {
 250         return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
 251 }
 252
 253 /* FIXME: What to do if we timeout? I think a host reset is probably in order,
 254  * so that's what we do. Should we increment the stat counters too?  */
 255 static void ether1394_tx_timeout(struct net_device *dev)
 256 {
 257         struct hpsb_host *host =
 258                         ((struct eth1394_priv *)netdev_priv(dev))->host;
 259
 260         ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
 261         ether1394_host_reset(host);
 262 }
 263
 264 static inline int ether1394_max_mtu(struct hpsb_host* host)
 265 {
 266         return (1 << (host->csr.max_rec + 1))
 267                         - sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
 268 }
 269
 270 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
 271 {
 272         int max_mtu;
 273
 274         if (new_mtu < 68)
 275                 return -EINVAL;
 276
 277         max_mtu = ether1394_max_mtu(
 278                         ((struct eth1394_priv *)netdev_priv(dev))->host);
 279         if (new_mtu > max_mtu) {
 280                 ETH1394_PRINT(KERN_INFO, dev->name,
 281                               "Local node constrains MTU to %d\n", max_mtu);
 282                 return -ERANGE;
 283         }
 284
 285         dev->mtu = new_mtu;
 286         return 0;
 287 }
 288
 289 static void purge_partial_datagram(struct list_head *old)
 290 {
 291         struct partial_datagram *pd;
 292         struct list_head *lh, *n;
 293         struct fragment_info *fi;
 294
 295         pd = list_entry(old, struct partial_datagram, list);
 296
 297         list_for_each_safe(lh, n, &pd->frag_info) {
 298                 fi = list_entry(lh, struct fragment_info, list);
 299                 list_del(lh);
 300                 kfree(fi);
 301         }
 302         list_del(old);
 303         kfree_skb(pd->skb);
 304         kfree(pd);
 305 }
 306
 307 /******************************************
 308  * 1394 bus activity functions
 309  ******************************************/
 310
 311 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
 312                                                   struct unit_directory *ud)
 313 {
 314         struct eth1394_node_ref *node;
 315
 316         list_for_each_entry(node, inl, list)
 317                 if (node->ud == ud)
 318                         return node;
 319
 320         return NULL;
 321 }
 322
 323 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
 324                                                        u64 guid)
 325 {
 326         struct eth1394_node_ref *node;
 327
 328         list_for_each_entry(node, inl, list)
 329                 if (node->ud->ne->guid == guid)
 330                         return node;
 331
 332         return NULL;
 333 }
 334
 335 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
 336                                                          nodeid_t nodeid)
 337 {
 338         struct eth1394_node_ref *node;
 339
 340         list_for_each_entry(node, inl, list)
 341                 if (node->ud->ne->nodeid == nodeid)
 342                         return node;
 343
 344         return NULL;
 345 }
 346
 347 static int eth1394_new_node(struct eth1394_host_info *hi,
 348                             struct unit_directory *ud)
 349 {
 350         struct eth1394_priv *priv;
 351         struct eth1394_node_ref *new_node;
 352         struct eth1394_node_info *node_info;
 353
 354         new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
 355         if (!new_node)
 356                 return -ENOMEM;
 357
 358         node_info = kmalloc(sizeof(*node_info), GFP_KERNEL);
 359         if (!node_info) {
 360                 kfree(new_node);
 361                 return -ENOMEM;
 362         }
 363
 364         spin_lock_init(&node_info->pdg.lock);
 365         INIT_LIST_HEAD(&node_info->pdg.list);
 366         node_info->pdg.sz = 0;
 367         node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
 368
 369         ud->device.driver_data = node_info;
 370         new_node->ud = ud;
 371
 372         priv = netdev_priv(hi->dev);
 373         list_add_tail(&new_node->list, &priv->ip_node_list);
 374         return 0;
 375 }
 376
 377 static int eth1394_probe(struct device *dev)
 378 {
 379         struct unit_directory *ud;
 380         struct eth1394_host_info *hi;
 381
 382         ud = container_of(dev, struct unit_directory, device);
 383         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 384         if (!hi)
 385                 return -ENOENT;
 386
 387         return eth1394_new_node(hi, ud);
 388 }
 389
 390 static int eth1394_remove(struct device *dev)
 391 {
 392         struct unit_directory *ud;
 393         struct eth1394_host_info *hi;
 394         struct eth1394_priv *priv;
 395         struct eth1394_node_ref *old_node;
 396         struct eth1394_node_info *node_info;
 397         struct list_head *lh, *n;
 398         unsigned long flags;
 399
 400         ud = container_of(dev, struct unit_directory, device);
 401         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 402         if (!hi)
 403                 return -ENOENT;
 404
 405         priv = netdev_priv(hi->dev);
 406
 407         old_node = eth1394_find_node(&priv->ip_node_list, ud);
 408         if (!old_node)
 409                 return 0;
 410
 411         list_del(&old_node->list);
 412         kfree(old_node);
 413
 414         node_info = (struct eth1394_node_info*)ud->device.driver_data;
 415
 416         spin_lock_irqsave(&node_info->pdg.lock, flags);
 417         /* The partial datagram list should be empty, but we'll just
 418          * make sure anyway... */
 419         list_for_each_safe(lh, n, &node_info->pdg.list)
 420                 purge_partial_datagram(lh);
 421         spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 422
 423         kfree(node_info);
 424         ud->device.driver_data = NULL;
 425         return 0;
 426 }
 427
 428 static int eth1394_update(struct unit_directory *ud)
 429 {
 430         struct eth1394_host_info *hi;
 431         struct eth1394_priv *priv;
 432         struct eth1394_node_ref *node;
 433
 434         hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
 435         if (!hi)
 436                 return -ENOENT;
 437
 438         priv = netdev_priv(hi->dev);
 439         node = eth1394_find_node(&priv->ip_node_list, ud);
 440         if (node)
 441                 return 0;
 442
 443         return eth1394_new_node(hi, ud);
 444 }
 445
 446 static struct ieee1394_device_id eth1394_id_table[] = {
 447         {
 448                 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
 449                                 IEEE1394_MATCH_VERSION),
 450                 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
 451                 .version = ETHER1394_GASP_VERSION,
 452         },
 453         {}
 454 };
 455
 456 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
 457
 458 static struct hpsb_protocol_driver eth1394_proto_driver = {
 459         .name           = driver_name,
 460         .id_table       = eth1394_id_table,
 461         .update         = eth1394_update,
 462         .driver         = {
 463                 .probe          = eth1394_probe,
 464                 .remove         = eth1394_remove,
 465         },
 466 };
 467
 468 static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
 469 {
 470         unsigned long flags;
 471         int i;
 472         struct eth1394_priv *priv = netdev_priv(dev);
 473         struct hpsb_host *host = priv->host;
 474         u64 guid = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
 475         int max_speed = IEEE1394_SPEED_MAX;
 476
 477         spin_lock_irqsave(&priv->lock, flags);
 478
 479         memset(priv->ud_list, 0, sizeof(priv->ud_list));
 480         priv->bc_maxpayload = 512;
 481
 482         /* Determine speed limit */
 483         /* FIXME: This is broken for nodes with link speed < PHY speed,
 484          * and it is suboptimal for S200B...S800B hardware.
 485          * The result of nodemgr's speed probe should be used somehow. */
 486         for (i = 0; i < host->node_count; i++) {
 487                 /* take care of S100B...S400B PHY ports */
 488                 if (host->speed[i] == SELFID_SPEED_UNKNOWN) {
 489                         max_speed = IEEE1394_SPEED_100;
 490                         break;
 491                 }
 492                 if (max_speed > host->speed[i])
 493                         max_speed = host->speed[i];
 494         }
 495         priv->bc_sspd = max_speed;
 496
 497         if (set_mtu) {
 498                 /* Use the RFC 2734 default 1500 octets or the maximum payload
 499                  * as initial MTU */
 500                 dev->mtu = min(1500, ether1394_max_mtu(host));
 501
 502                 /* Set our hardware address while we're at it */
 503                 memcpy(dev->dev_addr, &guid, sizeof(u64));
 504                 memset(dev->broadcast, 0xff, sizeof(u64));
 505         }
 506
 507         spin_unlock_irqrestore(&priv->lock, flags);
 508 }
 509
 510 static void ether1394_init_dev(struct net_device *dev)
 511 {
 512         dev->open               = ether1394_open;
 513         dev->stop               = ether1394_stop;
 514         dev->hard_start_xmit    = ether1394_tx;
 515         dev->get_stats          = ether1394_stats;
 516         dev->tx_timeout         = ether1394_tx_timeout;
 517         dev->change_mtu         = ether1394_change_mtu;
 518
 519         dev->hard_header        = ether1394_header;
 520         dev->rebuild_header     = ether1394_rebuild_header;
 521         dev->hard_header_cache  = ether1394_header_cache;
 522         dev->header_cache_update= ether1394_header_cache_update;
 523         dev->hard_header_parse  = ether1394_header_parse;
 524
 525         SET_ETHTOOL_OPS(dev, &ethtool_ops);
 526
 527         dev->watchdog_timeo     = ETHER1394_TIMEOUT;
 528         dev->flags              = IFF_BROADCAST | IFF_MULTICAST;
 529         dev->features           = NETIF_F_HIGHDMA;
 530         dev->addr_len           = ETH1394_ALEN;
 531         dev->hard_header_len    = ETH1394_HLEN;
 532         dev->type               = ARPHRD_IEEE1394;
 533
 534         /* FIXME: This value was copied from ether_setup(). Is it too much? */
 535         dev->tx_queue_len       = 1000;
 536 }
 537
 538 /*
 539  * Wake the queue up after commonly encountered transmit failure conditions are
 540  * hopefully over.  Currently only tlabel exhaustion is accounted for.
 541  */
 542 static void ether1394_wake_queue(struct work_struct *work)
 543 {
 544         struct eth1394_priv *priv;
 545         struct hpsb_packet *packet;
 546
 547         priv = container_of(work, struct eth1394_priv, wake);
 548         packet = hpsb_alloc_packet(0);
 549
 550         /* This is really bad, but unjam the queue anyway. */
 551         if (!packet)
 552                 goto out;
 553
 554         packet->host = priv->host;
 555         packet->node_id = priv->wake_node;
 556         /*
 557          * A transaction label is all we really want.  If we get one, it almost
 558          * always means we can get a lot more because the ieee1394 core recycled
 559          * a whole batch of tlabels, at last.
 560          */
 561         if (hpsb_get_tlabel(packet) == 0)
 562                 hpsb_free_tlabel(packet);
 563
 564         hpsb_free_packet(packet);
 565 out:
 566         netif_wake_queue(priv->wake_dev);
 567 }
 568
 569 /*
 570  * This function is called every time a card is found. It is generally called
 571  * when the module is installed. This is where we add all of our ethernet
 572  * devices. One for each host.
 573  */
 574 static void ether1394_add_host(struct hpsb_host *host)
 575 {
 576         struct eth1394_host_info *hi = NULL;
 577         struct net_device *dev = NULL;
 578         struct eth1394_priv *priv;
 579         u64 fifo_addr;
 580
 581         if (hpsb_config_rom_ip1394_add(host) != 0) {
 582                 ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
 583                 return;
 584         }
 585
 586         fifo_addr = hpsb_allocate_and_register_addrspace(
 587                         &eth1394_highlevel, host, &addr_ops,
 588                         ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
 589                         CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
 590         if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
 591                 ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
 592                 hpsb_config_rom_ip1394_remove(host);
 593                 return;
 594         }
 595
 596         dev = alloc_netdev(sizeof(*priv), "eth%d", ether1394_init_dev);
 597         if (dev == NULL) {
 598                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 599                 goto out;
 600         }
 601
 602         SET_NETDEV_DEV(dev, &host->device);
 603
 604         priv = netdev_priv(dev);
 605         INIT_LIST_HEAD(&priv->ip_node_list);
 606         spin_lock_init(&priv->lock);
 607         priv->host = host;
 608         priv->local_fifo = fifo_addr;
 609         INIT_WORK(&priv->wake, ether1394_wake_queue);
 610         priv->wake_dev = dev;
 611
 612         hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
 613         if (hi == NULL) {
 614                 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
 615                 goto out;
 616         }
 617
 618         ether1394_reset_priv(dev, 1);
 619
 620         if (register_netdev(dev)) {
 621                 ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
 622                 goto out;
 623         }
 624
 625         ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (fw-host%d)\n",
 626                       host->id);
 627
 628         hi->host = host;
 629         hi->dev = dev;
 630
 631         /* Ignore validity in hopes that it will be set in the future.  It'll
 632          * be checked when the eth device is opened. */
 633         priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 634
 635         ether1394_recv_init(priv);
 636         return;
 637 out:
 638         if (dev)
 639                 free_netdev(dev);
 640         if (hi)
 641                 hpsb_destroy_hostinfo(&eth1394_highlevel, host);
 642         hpsb_unregister_addrspace(&eth1394_highlevel, host, fifo_addr);
 643         hpsb_config_rom_ip1394_remove(host);
 644 }
 645
 646 /* Remove a card from our list */
 647 static void ether1394_remove_host(struct hpsb_host *host)
 648 {
 649         struct eth1394_host_info *hi;
 650         struct eth1394_priv *priv;
 651
 652         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 653         if (!hi)
 654                 return;
 655         priv = netdev_priv(hi->dev);
 656         hpsb_unregister_addrspace(&eth1394_highlevel, host, priv->local_fifo);
 657         hpsb_config_rom_ip1394_remove(host);
 658         if (priv->iso)
 659                 hpsb_iso_shutdown(priv->iso);
 660         unregister_netdev(hi->dev);
 661         free_netdev(hi->dev);
 662 }
 663
 664 /* A bus reset happened */
 665 static void ether1394_host_reset(struct hpsb_host *host)
 666 {
 667         struct eth1394_host_info *hi;
 668         struct eth1394_priv *priv;
 669         struct net_device *dev;
 670         struct list_head *lh, *n;
 671         struct eth1394_node_ref *node;
 672         struct eth1394_node_info *node_info;
 673         unsigned long flags;
 674
 675         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
 676
 677         /* This can happen for hosts that we don't use */
 678         if (!hi)
 679                 return;
 680
 681         dev = hi->dev;
 682         priv = netdev_priv(dev);
 683
 684         /* Reset our private host data, but not our MTU */
 685         netif_stop_queue(dev);
 686         ether1394_reset_priv(dev, 0);
 687
 688         list_for_each_entry(node, &priv->ip_node_list, list) {
 689                 node_info = node->ud->device.driver_data;
 690
 691                 spin_lock_irqsave(&node_info->pdg.lock, flags);
 692
 693                 list_for_each_safe(lh, n, &node_info->pdg.list)
 694                         purge_partial_datagram(lh);
 695
 696                 INIT_LIST_HEAD(&(node_info->pdg.list));
 697                 node_info->pdg.sz = 0;
 698
 699                 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
 700         }
 701
 702         netif_wake_queue(dev);
 703 }
 704
 705 /******************************************
 706  * HW Header net device functions
 707  ******************************************/
 708 /* These functions have been adapted from net/ethernet/eth.c */
 709
 710 /* Create a fake MAC header for an arbitrary protocol layer.
 711  * saddr=NULL means use device source address
 712  * daddr=NULL means leave destination address (eg unresolved arp). */
 713 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
 714                             unsigned short type, void *daddr, void *saddr,
 715                             unsigned len)
 716 {
 717         struct eth1394hdr *eth =
 718                         (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
 719
 720         eth->h_proto = htons(type);
 721
 722         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
 723                 memset(eth->h_dest, 0, dev->addr_len);
 724                 return dev->hard_header_len;
 725         }
 726
 727         if (daddr) {
 728                 memcpy(eth->h_dest, daddr, dev->addr_len);
 729                 return dev->hard_header_len;
 730         }
 731
 732         return -dev->hard_header_len;
 733 }
 734
 735 /* Rebuild the faked MAC header. This is called after an ARP
 736  * (or in future other address resolution) has completed on this
 737  * sk_buff. We now let ARP fill in the other fields.
 738  *
 739  * This routine CANNOT use cached dst->neigh!
 740  * Really, it is used only when dst->neigh is wrong.
 741  */
 742 static int ether1394_rebuild_header(struct sk_buff *skb)
 743 {
 744         struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
 745
 746         if (eth->h_proto == htons(ETH_P_IP))
 747                 return arp_find((unsigned char *)&eth->h_dest, skb);
 748
 749         ETH1394_PRINT(KERN_DEBUG, skb->dev->name,
 750                       "unable to resolve type %04x addresses\n",
 751                       ntohs(eth->h_proto));
 752         return 0;
 753 }
 754
 755 static int ether1394_header_parse(const struct sk_buff *skb,
 756                                   unsigned char *haddr)
 757 {
 758         memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
 759         return ETH1394_ALEN;
 760 }
 761
 762 static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
 763 {
 764         unsigned short type = hh->hh_type;
 765         struct net_device *dev = neigh->dev;
 766         struct eth1394hdr *eth =
 767                 (struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
 768
 769         if (type == htons(ETH_P_802_3))
 770                 return -1;
 771
 772         eth->h_proto = type;
 773         memcpy(eth->h_dest, neigh->ha, dev->addr_len);
 774
 775         hh->hh_len = ETH1394_HLEN;
 776         return 0;
 777 }
 778
 779 /* Called by Address Resolution module to notify changes in address. */
 780 static void ether1394_header_cache_update(struct hh_cache *hh,
 781                                           struct net_device *dev,
 782                                           unsigned char * haddr)
 783 {
 784         memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
 785 }
 786
 787 /******************************************
 788  * Datagram reception code
 789  ******************************************/
 790
 791 /* Copied from net/ethernet/eth.c */
 792 static u16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
 793 {
 794         struct eth1394hdr *eth;
 795         unsigned char *rawp;
 796
 797         skb_reset_mac_header(skb);
 798         skb_pull(skb, ETH1394_HLEN);
 799         eth = eth1394_hdr(skb);
 800
 801         if (*eth->h_dest & 1) {
 802                 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len) == 0)
 803                         skb->pkt_type = PACKET_BROADCAST;
 804 #if 0
 805                 else
 806                         skb->pkt_type = PACKET_MULTICAST;
 807 #endif
 808         } else {
 809                 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
 810                         skb->pkt_type = PACKET_OTHERHOST;
 811         }
 812
 813         if (ntohs(eth->h_proto) >= 1536)
 814                 return eth->h_proto;
 815
 816         rawp = skb->data;
 817
 818         if (*(unsigned short *)rawp == 0xFFFF)
 819                 return htons(ETH_P_802_3);
 820
 821         return htons(ETH_P_802_2);
 822 }
 823
 824 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
 825  * We also perform ARP translation here, if need be.  */
 826 static u16 ether1394_parse_encap(struct sk_buff *skb, struct net_device *dev,
 827                                  nodeid_t srcid, nodeid_t destid,
 828                                  u16 ether_type)
 829 {
 830         struct eth1394_priv *priv = netdev_priv(dev);
 831         u64 dest_hw;
 832         unsigned short ret = 0;
 833
 834         /* Setup our hw addresses. We use these to build the ethernet header. */
 835         if (destid == (LOCAL_BUS | ALL_NODES))
 836                 dest_hw = ~0ULL;  /* broadcast */
 837         else
 838                 dest_hw = cpu_to_be64((u64)priv->host->csr.guid_hi << 32 |
 839                                       priv->host->csr.guid_lo);
 840
 841         /* If this is an ARP packet, convert it. First, we want to make
 842          * use of some of the fields, since they tell us a little bit
 843          * about the sending machine.  */
 844         if (ether_type == htons(ETH_P_ARP)) {
 845                 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
 846                 struct arphdr *arp = (struct arphdr *)skb->data;
 847                 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
 848                 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
 849                                            ntohl(arp1394->fifo_lo);
 850                 u8 max_rec = min(priv->host->csr.max_rec,
 851                                  (u8)(arp1394->max_rec));
 852                 int sspd = arp1394->sspd;
 853                 u16 maxpayload;
 854                 struct eth1394_node_ref *node;
 855                 struct eth1394_node_info *node_info;
 856                 __be64 guid;
 857
 858                 /* Sanity check. MacOSX seems to be sending us 131 in this
 859                  * field (atleast on my Panther G5). Not sure why. */
 860                 if (sspd > 5 || sspd < 0)
 861                         sspd = 0;
 862
 863                 maxpayload = min(eth1394_speedto_maxpayload[sspd],
 864                                  (u16)(1 << (max_rec + 1)));
 865
 866                 guid = get_unaligned(&arp1394->s_uniq_id);
 867                 node = eth1394_find_node_guid(&priv->ip_node_list,
 868                                               be64_to_cpu(guid));
 869                 if (!node)
 870                         return 0;
 871
 872                 node_info =
 873                     (struct eth1394_node_info *)node->ud->device.driver_data;
 874
 875                 /* Update our speed/payload/fifo_offset table */
 876                 node_info->maxpayload = maxpayload;
 877                 node_info->sspd =       sspd;
 878                 node_info->fifo =       fifo_addr;
 879
 880                 /* Now that we're done with the 1394 specific stuff, we'll
 881                  * need to alter some of the data.  Believe it or not, all
 882                  * that needs to be done is sender_IP_address needs to be
 883                  * moved, the destination hardware address get stuffed
 884                  * in and the hardware address length set to 8.
 885                  *
 886                  * IMPORTANT: The code below overwrites 1394 specific data
 887                  * needed above so keep the munging of the data for the
 888                  * higher level IP stack last. */
 889
 890                 arp->ar_hln = 8;
 891                 arp_ptr += arp->ar_hln;         /* skip over sender unique id */
 892                 *(u32 *)arp_ptr = arp1394->sip; /* move sender IP addr */
 893                 arp_ptr += arp->ar_pln;         /* skip over sender IP addr */
 894
 895                 if (arp->ar_op == htons(ARPOP_REQUEST))
 896                         memset(arp_ptr, 0, sizeof(u64));
 897                 else
 898                         memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
 899         }
 900
 901         /* Now add the ethernet header. */
 902         if (dev->hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
 903                              skb->len) >= 0)
 904                 ret = ether1394_type_trans(skb, dev);
 905
 906         return ret;
 907 }
 908
 909 static int fragment_overlap(struct list_head *frag_list, int offset, int len)
 910 {
 911         struct fragment_info *fi;
 912         int end = offset + len;
 913
 914         list_for_each_entry(fi, frag_list, list)
 915                 if (offset < fi->offset + fi->len && end > fi->offset)
 916                         return 1;
 917
 918         return 0;
 919 }
 920
 921 static struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
 922 {
 923         struct partial_datagram *pd;
 924
 925         list_for_each_entry(pd, pdgl, list)
 926                 if (pd->dgl == dgl)
 927                         return &pd->list;
 928
 929         return NULL;
 930 }
 931
 932 /* Assumes that new fragment does not overlap any existing fragments */
 933 static int new_fragment(struct list_head *frag_info, int offset, int len)
 934 {
 935         struct list_head *lh;
 936         struct fragment_info *fi, *fi2, *new;
 937
 938         list_for_each(lh, frag_info) {
 939                 fi = list_entry(lh, struct fragment_info, list);
 940                 if (fi->offset + fi->len == offset) {
 941                         /* The new fragment can be tacked on to the end */
 942                         fi->len += len;
 943                         /* Did the new fragment plug a hole? */
 944                         fi2 = list_entry(lh->next, struct fragment_info, list);
 945                         if (fi->offset + fi->len == fi2->offset) {
 946                                 /* glue fragments together */
 947                                 fi->len += fi2->len;
 948                                 list_del(lh->next);
 949                                 kfree(fi2);
 950                         }
 951                         return 0;
 952                 } else if (offset + len == fi->offset) {
 953                         /* The new fragment can be tacked on to the beginning */
 954                         fi->offset = offset;
 955                         fi->len += len;
 956                         /* Did the new fragment plug a hole? */
 957                         fi2 = list_entry(lh->prev, struct fragment_info, list);
 958                         if (fi2->offset + fi2->len == fi->offset) {
 959                                 /* glue fragments together */
 960                                 fi2->len += fi->len;
 961                                 list_del(lh);
 962                                 kfree(fi);
 963                         }
 964                         return 0;
 965                 } else if (offset > fi->offset + fi->len) {
 966                         break;
 967                 } else if (offset + len < fi->offset) {
 968                         lh = lh->prev;
 969                         break;
 970                 }
 971         }
 972
 973         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 974         if (!new)
 975                 return -ENOMEM;
 976
 977         new->offset = offset;
 978         new->len = len;
 979
 980         list_add(&new->list, lh);
 981         return 0;
 982 }
 983
 984 static int new_partial_datagram(struct net_device *dev, struct list_head *pdgl,
 985                                 int dgl, int dg_size, char *frag_buf,
 986                                 int frag_off, int frag_len)
 987 {
 988         struct partial_datagram *new;
 989
 990         new = kmalloc(sizeof(*new), GFP_ATOMIC);
 991         if (!new)
 992                 return -ENOMEM;
 993
 994         INIT_LIST_HEAD(&new->frag_info);
 995
 996         if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
 997                 kfree(new);
 998                 return -ENOMEM;
 999         }
1000
1001         new->dgl = dgl;
1002         new->dg_size = dg_size;
1003
1004         new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1005         if (!new->skb) {
1006                 struct fragment_info *fi = list_entry(new->frag_info.next,
1007                                                       struct fragment_info,
1008                                                       list);
1009                 kfree(fi);
1010                 kfree(new);
1011                 return -ENOMEM;
1012         }
1013
1014         skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1015         new->pbuf = skb_put(new->skb, dg_size);
1016         memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1017
1018         list_add(&new->list, pdgl);
1019         return 0;
1020 }
1021
1022 static int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1023                                    char *frag_buf, int frag_off, int frag_len)
1024 {
1025         struct partial_datagram *pd =
1026                         list_entry(lh, struct partial_datagram, list);
1027
1028         if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0)
1029                 return -ENOMEM;
1030
1031         memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1032
1033         /* Move list entry to beginnig of list so that oldest partial
1034          * datagrams percolate to the end of the list */
1035         list_move(lh, pdgl);
1036         return 0;
1037 }
1038
1039 static int is_datagram_complete(struct list_head *lh, int dg_size)
1040 {
1041         struct partial_datagram *pd;
1042         struct fragment_info *fi;
1043
1044         pd = list_entry(lh, struct partial_datagram, list);
1045         fi = list_entry(pd->frag_info.next, struct fragment_info, list);
1046
1047         return (fi->len == dg_size);
1048 }
1049
1050 /* Packet reception. We convert the IP1394 encapsulation header to an
1051  * ethernet header, and fill it with some of our other fields. This is
1052  * an incoming packet from the 1394 bus.  */
1053 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1054                                   char *buf, int len)
1055 {
1056         struct sk_buff *skb;
1057         unsigned long flags;
1058         struct eth1394_priv *priv = netdev_priv(dev);
1059         union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1060         u16 ether_type = 0;  /* initialized to clear warning */
1061         int hdr_len;
1062         struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1063         struct eth1394_node_info *node_info;
1064
1065         if (!ud) {
1066                 struct eth1394_node_ref *node;
1067                 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1068                 if (unlikely(!node)) {
1069                         HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1070                                    "lookup failure: " NODE_BUS_FMT,
1071                                    NODE_BUS_ARGS(priv->host, srcid));
1072                         priv->stats.rx_dropped++;
1073                         return -1;
1074                 }
1075                 ud = node->ud;
1076
1077                 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1078         }
1079
1080         node_info = (struct eth1394_node_info *)ud->device.driver_data;
1081
1082         /* First, did we receive a fragmented or unfragmented datagram? */
1083         hdr->words.word1 = ntohs(hdr->words.word1);
1084
1085         hdr_len = hdr_type_len[hdr->common.lf];
1086
1087         if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1088                 /* An unfragmented datagram has been received by the ieee1394
1089                  * bus. Build an skbuff around it so we can pass it to the
1090                  * high level network layer. */
1091
1092                 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1093                 if (unlikely(!skb)) {
1094                         ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
1095                         priv->stats.rx_dropped++;
1096                         return -1;
1097                 }
1098                 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1099                 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len,
1100                        len - hdr_len);
1101                 ether_type = hdr->uf.ether_type;
1102         } else {
1103                 /* A datagram fragment has been received, now the fun begins. */
1104
1105                 struct list_head *pdgl, *lh;
1106                 struct partial_datagram *pd;
1107                 int fg_off;
1108                 int fg_len = len - hdr_len;
1109                 int dg_size;
1110                 int dgl;
1111                 int retval;
1112                 struct pdg_list *pdg = &(node_info->pdg);
1113
1114                 hdr->words.word3 = ntohs(hdr->words.word3);
1115                 /* The 4th header word is reserved so no need to do ntohs() */
1116
1117                 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1118                         ether_type = hdr->ff.ether_type;
1119                         dgl = hdr->ff.dgl;
1120                         dg_size = hdr->ff.dg_size + 1;
1121                         fg_off = 0;
1122                 } else {
1123                         hdr->words.word2 = ntohs(hdr->words.word2);
1124                         dgl = hdr->sf.dgl;
1125                         dg_size = hdr->sf.dg_size + 1;
1126                         fg_off = hdr->sf.fg_off;
1127                 }
1128                 spin_lock_irqsave(&pdg->lock, flags);
1129
1130                 pdgl = &(pdg->list);
1131                 lh = find_partial_datagram(pdgl, dgl);
1132
1133                 if (lh == NULL) {
1134                         while (pdg->sz >= max_partial_datagrams) {
1135                                 /* remove the oldest */
1136                                 purge_partial_datagram(pdgl->prev);
1137                                 pdg->sz--;
1138                         }
1139
1140                         retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1141                                                       buf + hdr_len, fg_off,
1142                                                       fg_len);
1143                         if (retval < 0) {
1144                                 spin_unlock_irqrestore(&pdg->lock, flags);
1145                                 goto bad_proto;
1146                         }
1147                         pdg->sz++;
1148                         lh = find_partial_datagram(pdgl, dgl);
1149                 } else {
1150                         struct partial_datagram *pd;
1151
1152                         pd = list_entry(lh, struct partial_datagram, list);
1153
1154                         if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1155                                 /* Overlapping fragments, obliterate old
1156                                  * datagram and start new one. */
1157                                 purge_partial_datagram(lh);
1158                                 retval = new_partial_datagram(dev, pdgl, dgl,
1159                                                               dg_size,
1160                                                               buf + hdr_len,
1161                                                               fg_off, fg_len);
1162                                 if (retval < 0) {
1163                                         pdg->sz--;
1164                                         spin_unlock_irqrestore(&pdg->lock, flags);
1165                                         goto bad_proto;
1166                                 }
1167                         } else {
1168                                 retval = update_partial_datagram(pdgl, lh,
1169                                                                  buf + hdr_len,
1170                                                                  fg_off, fg_len);
1171                                 if (retval < 0) {
1172                                         /* Couldn't save off fragment anyway
1173                                          * so might as well obliterate the
1174                                          * datagram now. */
1175                                         purge_partial_datagram(lh);
1176                                         pdg->sz--;
1177                                         spin_unlock_irqrestore(&pdg->lock, flags);
1178                                         goto bad_proto;
1179                                 }
1180                         } /* fragment overlap */
1181                 } /* new datagram or add to existing one */
1182
1183                 pd = list_entry(lh, struct partial_datagram, list);
1184
1185                 if (hdr->common.lf == ETH1394_HDR_LF_FF)
1186                         pd->ether_type = ether_type;
1187
1188                 if (is_datagram_complete(lh, dg_size)) {
1189                         ether_type = pd->ether_type;
1190                         pdg->sz--;
1191                         skb = skb_get(pd->skb);
1192                         purge_partial_datagram(lh);
1193                         spin_unlock_irqrestore(&pdg->lock, flags);
1194                 } else {
1195                         /* Datagram is not complete, we're done for the
1196                          * moment. */
1197                         spin_unlock_irqrestore(&pdg->lock, flags);
1198                         return 0;
1199                 }
1200         } /* unframgented datagram or fragmented one */
1201
1202         /* Write metadata, and then pass to the receive level */
1203         skb->dev = dev;
1204         skb->ip_summed = CHECKSUM_UNNECESSARY;  /* don't check it */
1205
1206         /* Parse the encapsulation header. This actually does the job of
1207          * converting to an ethernet frame header, aswell as arp
1208          * conversion if needed. ARP conversion is easier in this
1209          * direction, since we are using ethernet as our backend.  */
1210         skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1211                                               ether_type);
1212
1213         spin_lock_irqsave(&priv->lock, flags);
1214
1215         if (!skb->protocol) {
1216                 priv->stats.rx_errors++;
1217                 priv->stats.rx_dropped++;
1218                 dev_kfree_skb_any(skb);
1219                 goto bad_proto;
1220         }
1221
1222         if (netif_rx(skb) == NET_RX_DROP) {
1223                 priv->stats.rx_errors++;
1224                 priv->stats.rx_dropped++;
1225                 goto bad_proto;
1226         }
1227
1228         /* Statistics */
1229         priv->stats.rx_packets++;
1230         priv->stats.rx_bytes += skb->len;
1231
1232 bad_proto:
1233         if (netif_queue_stopped(dev))
1234                 netif_wake_queue(dev);
1235         spin_unlock_irqrestore(&priv->lock, flags);
1236
1237         dev->last_rx = jiffies;
1238
1239         return 0;
1240 }
1241
1242 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1243                            quadlet_t *data, u64 addr, size_t len, u16 flags)
1244 {
1245         struct eth1394_host_info *hi;
1246
1247         hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
1248         if (unlikely(!hi)) {
1249                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1250                                 host->id);
1251                 return RCODE_ADDRESS_ERROR;
1252         }
1253
1254         if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1255                 return RCODE_ADDRESS_ERROR;
1256         else
1257                 return RCODE_COMPLETE;
1258 }
1259
1260 static void ether1394_iso(struct hpsb_iso *iso)
1261 {
1262         quadlet_t *data;
1263         char *buf;
1264         struct eth1394_host_info *hi;
1265         struct net_device *dev;
1266         struct eth1394_priv *priv;
1267         unsigned int len;
1268         u32 specifier_id;
1269         u16 source_id;
1270         int i;
1271         int nready;
1272
1273         hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
1274         if (unlikely(!hi)) {
1275                 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1276                                 iso->host->id);
1277                 return;
1278         }
1279
1280         dev = hi->dev;
1281
1282         nready = hpsb_iso_n_ready(iso);
1283         for (i = 0; i < nready; i++) {
1284                 struct hpsb_iso_packet_info *info =
1285                         &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1286                 data = (quadlet_t *)(iso->data_buf.kvirt + info->offset);
1287
1288                 /* skip over GASP header */
1289                 buf = (char *)data + 8;
1290                 len = info->len - 8;
1291
1292                 specifier_id = (be32_to_cpu(data[0]) & 0xffff) << 8 |
1293                                (be32_to_cpu(data[1]) & 0xff000000) >> 24;
1294                 source_id = be32_to_cpu(data[0]) >> 16;
1295
1296                 priv = netdev_priv(dev);
1297
1298                 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f)
1299                     || specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1300                         /* This packet is not for us */
1301                         continue;
1302                 }
1303                 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1304                                        buf, len);
1305         }
1306
1307         hpsb_iso_recv_release_packets(iso, i);
1308
1309         dev->last_rx = jiffies;
1310 }
1311
1312 /******************************************
1313  * Datagram transmission code
1314  ******************************************/
1315
1316 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1317  * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
1318  * needs to be munged a bit.  The remainder of the arphdr is formatted based
1319  * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
1320  * judge.
1321  *
1322  * Now that the EUI is used for the hardware address all we need to do to make
1323  * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1324  * speed, and unicast FIFO address information between the sender_unique_id
1325  * and the IP addresses.
1326  */
1327 static void ether1394_arp_to_1394arp(struct sk_buff *skb,
1328                                      struct net_device *dev)
1329 {
1330         struct eth1394_priv *priv = netdev_priv(dev);
1331         struct arphdr *arp = (struct arphdr *)skb->data;
1332         unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1333         struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1334
1335         arp1394->hw_addr_len    = 16;
1336         arp1394->sip            = *(u32*)(arp_ptr + ETH1394_ALEN);
1337         arp1394->max_rec        = priv->host->csr.max_rec;
1338         arp1394->sspd           = priv->host->csr.lnk_spd;
1339         arp1394->fifo_hi        = htons(priv->local_fifo >> 32);
1340         arp1394->fifo_lo        = htonl(priv->local_fifo & ~0x0);
1341 }
1342
1343 /* We need to encapsulate the standard header with our own. We use the
1344  * ethernet header's proto for our own. */
1345 static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1346                                                __be16 proto,
1347                                                union eth1394_hdr *hdr,
1348                                                u16 dg_size, u16 dgl)
1349 {
1350         unsigned int adj_max_payload =
1351                                 max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1352
1353         /* Does it all fit in one packet? */
1354         if (dg_size <= adj_max_payload) {
1355                 hdr->uf.lf = ETH1394_HDR_LF_UF;
1356                 hdr->uf.ether_type = proto;
1357         } else {
1358                 hdr->ff.lf = ETH1394_HDR_LF_FF;
1359                 hdr->ff.ether_type = proto;
1360                 hdr->ff.dg_size = dg_size - 1;
1361                 hdr->ff.dgl = dgl;
1362                 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1363         }
1364         return (dg_size + adj_max_payload - 1) / adj_max_payload;
1365 }
1366
1367 static unsigned int ether1394_encapsulate(struct sk_buff *skb,
1368                                           unsigned int max_payload,
1369                                           union eth1394_hdr *hdr)
1370 {
1371         union eth1394_hdr *bufhdr;
1372         int ftype = hdr->common.lf;
1373         int hdrsz = hdr_type_len[ftype];
1374         unsigned int adj_max_payload = max_payload - hdrsz;
1375
1376         switch (ftype) {
1377         case ETH1394_HDR_LF_UF:
1378                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1379                 bufhdr->words.word1 = htons(hdr->words.word1);
1380                 bufhdr->words.word2 = hdr->words.word2;
1381                 break;
1382
1383         case ETH1394_HDR_LF_FF:
1384                 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1385                 bufhdr->words.word1 = htons(hdr->words.word1);
1386                 bufhdr->words.word2 = hdr->words.word2;
1387                 bufhdr->words.word3 = htons(hdr->words.word3);
1388                 bufhdr->words.word4 = 0;
1389
1390                 /* Set frag type here for future interior fragments */
1391                 hdr->common.lf = ETH1394_HDR_LF_IF;
1392                 hdr->sf.fg_off = 0;
1393                 break;
1394
1395         default:
1396                 hdr->sf.fg_off += adj_max_payload;
1397                 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1398                 if (max_payload >= skb->len)
1399                         hdr->common.lf = ETH1394_HDR_LF_LF;
1400                 bufhdr->words.word1 = htons(hdr->words.word1);
1401                 bufhdr->words.word2 = htons(hdr->words.word2);
1402                 bufhdr->words.word3 = htons(hdr->words.word3);
1403                 bufhdr->words.word4 = 0;
1404         }
1405         return min(max_payload, skb->len);
1406 }
1407
1408 static struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1409 {
1410         struct hpsb_packet *p;
1411
1412         p = hpsb_alloc_packet(0);
1413         if (p) {
1414                 p->host = host;
1415                 p->generation = get_hpsb_generation(host);
1416                 p->type = hpsb_async;
1417         }
1418         return p;
1419 }
1420
1421 static int ether1394_prep_write_packet(struct hpsb_packet *p,
1422                                        struct hpsb_host *host, nodeid_t node,
1423                                        u64 addr, void *data, int tx_len)
1424 {
1425         p->node_id = node;
1426
1427         if (hpsb_get_tlabel(p))
1428                 return -EAGAIN;
1429
1430         p->tcode = TCODE_WRITEB;
1431         p->header_size = 16;
1432         p->expect_response = 1;
1433         p->header[0] =
1434                 p->node_id << 16 | p->tlabel << 10 | 1 << 8 | TCODE_WRITEB << 4;
1435         p->header[1] = host->node_id << 16 | addr >> 32;
1436         p->header[2] = addr & 0xffffffff;
1437         p->header[3] = tx_len << 16;
1438         p->data_size = (tx_len + 3) & ~3;
1439         p->data = data;
1440
1441         return 0;
1442 }
1443
1444 static void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1445                                        struct eth1394_priv *priv,
1446                                        struct sk_buff *skb, int length)
1447 {
1448         p->header_size = 4;
1449         p->tcode = TCODE_STREAM_DATA;
1450
1451         p->header[0] = length << 16 | 3 << 14 | priv->broadcast_channel << 8 |
1452                        TCODE_STREAM_DATA << 4;
1453         p->data_size = length;
1454         p->data = (quadlet_t *)skb->data - 2;
1455         p->data[0] = cpu_to_be32(priv->host->node_id << 16 |
1456                                  ETHER1394_GASP_SPECIFIER_ID_HI);
1457         p->data[1] = cpu_to_be32(ETHER1394_GASP_SPECIFIER_ID_LO << 24 |
1458                                  ETHER1394_GASP_VERSION);
1459
1460         p->speed_code = priv->bc_sspd;
1461
1462         /* prevent hpsb_send_packet() from overriding our speed code */
1463         p->node_id = LOCAL_BUS | ALL_NODES;
1464 }
1465
1466 static void ether1394_free_packet(struct hpsb_packet *packet)
1467 {
1468         if (packet->tcode != TCODE_STREAM_DATA)
1469                 hpsb_free_tlabel(packet);
1470         hpsb_free_packet(packet);
1471 }
1472
1473 static void ether1394_complete_cb(void *__ptask);
1474
1475 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1476 {
1477         struct eth1394_priv *priv = ptask->priv;
1478         struct hpsb_packet *packet = NULL;
1479
1480         packet = ether1394_alloc_common_packet(priv->host);
1481         if (!packet)
1482                 return -ENOMEM;
1483
1484         if (ptask->tx_type == ETH1394_GASP) {
1485                 int length = tx_len + 2 * sizeof(quadlet_t);
1486
1487                 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1488         } else if (ether1394_prep_write_packet(packet, priv->host,
1489                                                ptask->dest_node,
1490                                                ptask->addr, ptask->skb->data,
1491                                                tx_len)) {
1492                 hpsb_free_packet(packet);
1493                 return -EAGAIN;
1494         }
1495
1496         ptask->packet = packet;
1497         hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1498                                       ptask);
1499
1500         if (hpsb_send_packet(packet) < 0) {
1501                 ether1394_free_packet(packet);
1502                 return -EIO;
1503         }
1504
1505         return 0;
1506 }
1507
1508 /* Task function to be run when a datagram transmission is completed */
1509 static void ether1394_dg_complete(struct packet_task *ptask, int fail)
1510 {
1511         struct sk_buff *skb = ptask->skb;
1512         struct eth1394_priv *priv = netdev_priv(skb->dev);
1513         unsigned long flags;
1514
1515         /* Statistics */
1516         spin_lock_irqsave(&priv->lock, flags);
1517         if (fail) {
1518                 priv->stats.tx_dropped++;
1519                 priv->stats.tx_errors++;
1520         } else {
1521                 priv->stats.tx_bytes += skb->len;
1522                 priv->stats.tx_packets++;
1523         }
1524         spin_unlock_irqrestore(&priv->lock, flags);
1525
1526         dev_kfree_skb_any(skb);
1527         kmem_cache_free(packet_task_cache, ptask);
1528 }
1529
1530 /* Callback for when a packet has been sent and the status of that packet is
1531  * known */
1532 static void ether1394_complete_cb(void *__ptask)
1533 {
1534         struct packet_task *ptask = (struct packet_task *)__ptask;
1535         struct hpsb_packet *packet = ptask->packet;
1536         int fail = 0;
1537
1538         if (packet->tcode != TCODE_STREAM_DATA)
1539                 fail = hpsb_packet_success(packet);
1540
1541         ether1394_free_packet(packet);
1542
1543         ptask->outstanding_pkts--;
1544         if (ptask->outstanding_pkts > 0 && !fail) {
1545                 int tx_len, err;
1546
1547                 /* Add the encapsulation header to the fragment */
1548                 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1549                                                &ptask->hdr);
1550                 err = ether1394_send_packet(ptask, tx_len);
1551                 if (err) {
1552                         if (err == -EAGAIN)
1553                                 ETH1394_PRINT_G(KERN_ERR, "Out of tlabels\n");
1554
1555                         ether1394_dg_complete(ptask, 1);
1556                 }
1557         } else {
1558                 ether1394_dg_complete(ptask, fail);
1559         }
1560 }
1561
1562 /* Transmit a packet (called by kernel) */
1563 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
1564 {
1565         struct eth1394hdr hdr_buf;
1566         struct eth1394_priv *priv = netdev_priv(dev);
1567         __be16 proto;
1568         unsigned long flags;
1569         nodeid_t dest_node;
1570         eth1394_tx_type tx_type;
1571         unsigned int tx_len;
1572         unsigned int max_payload;
1573         u16 dg_size;
1574         u16 dgl;
1575         struct packet_task *ptask;
1576         struct eth1394_node_ref *node;
1577         struct eth1394_node_info *node_info = NULL;
1578
1579         ptask = kmem_cache_alloc(packet_task_cache, GFP_ATOMIC);
1580         if (ptask == NULL)
1581                 goto fail;
1582
1583         /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1584          * it does not set our validity bit. We need to compensate for
1585          * that somewhere else, but not in eth1394. */
1586 #if 0
1587         if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000)
1588                 goto fail;
1589 #endif
1590
1591         skb = skb_share_check(skb, GFP_ATOMIC);
1592         if (!skb)
1593                 goto fail;
1594
1595         /* Get rid of the fake eth1394 header, but first make a copy.
1596          * We might need to rebuild the header on tx failure. */
1597         memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1598         skb_pull(skb, ETH1394_HLEN);
1599
1600         proto = hdr_buf.h_proto;
1601         dg_size = skb->len;
1602
1603         /* Set the transmission type for the packet.  ARP packets and IP
1604          * broadcast packets are sent via GASP. */
1605         if (memcmp(hdr_buf.h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1606             proto == htons(ETH_P_ARP) ||
1607             (proto == htons(ETH_P_IP) &&
1608              IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1609                 tx_type = ETH1394_GASP;
1610                 dest_node = LOCAL_BUS | ALL_NODES;
1611                 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1612                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1613                 dgl = priv->bc_dgl;
1614                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1615                         priv->bc_dgl++;
1616         } else {
1617                 __be64 guid = get_unaligned((u64 *)hdr_buf.h_dest);
1618
1619                 node = eth1394_find_node_guid(&priv->ip_node_list,
1620                                               be64_to_cpu(guid));
1621                 if (!node)
1622                         goto fail;
1623
1624                 node_info =
1625                     (struct eth1394_node_info *)node->ud->device.driver_data;
1626                 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE)
1627                         goto fail;
1628
1629                 dest_node = node->ud->ne->nodeid;
1630                 max_payload = node_info->maxpayload;
1631                 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1632
1633                 dgl = node_info->dgl;
1634                 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1635                         node_info->dgl++;
1636                 tx_type = ETH1394_WRREQ;
1637         }
1638
1639         /* If this is an ARP packet, convert it */
1640         if (proto == htons(ETH_P_ARP))
1641                 ether1394_arp_to_1394arp(skb, dev);
1642
1643         ptask->hdr.words.word1 = 0;
1644         ptask->hdr.words.word2 = 0;
1645         ptask->hdr.words.word3 = 0;
1646         ptask->hdr.words.word4 = 0;
1647         ptask->skb = skb;
1648         ptask->priv = priv;
1649         ptask->tx_type = tx_type;
1650
1651         if (tx_type != ETH1394_GASP) {
1652                 u64 addr;
1653
1654                 spin_lock_irqsave(&priv->lock, flags);
1655                 addr = node_info->fifo;
1656                 spin_unlock_irqrestore(&priv->lock, flags);
1657
1658                 ptask->addr = addr;
1659                 ptask->dest_node = dest_node;
1660         }
1661
1662         ptask->tx_type = tx_type;
1663         ptask->max_payload = max_payload;
1664         ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload,
1665                                         proto, &ptask->hdr, dg_size, dgl);
1666
1667         /* Add the encapsulation header to the fragment */
1668         tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1669         dev->trans_start = jiffies;
1670         if (ether1394_send_packet(ptask, tx_len)) {
1671                 if (dest_node == (LOCAL_BUS | ALL_NODES))
1672                         goto fail;
1673
1674                 /* At this point we want to restore the packet.  When we return
1675                  * here with NETDEV_TX_BUSY we will get another entrance in this
1676                  * routine with the same skb and we need it to look the same.
1677                  * So we pull 4 more bytes, then build the header again. */
1678                 skb_pull(skb, 4);
1679                 ether1394_header(skb, dev, ntohs(hdr_buf.h_proto),
1680                                  hdr_buf.h_dest, NULL, 0);
1681
1682                 /* Most failures of ether1394_send_packet are recoverable. */
1683                 netif_stop_queue(dev);
1684                 priv->wake_node = dest_node;
1685                 schedule_work(&priv->wake);
1686                 kmem_cache_free(packet_task_cache, ptask);
1687                 return NETDEV_TX_BUSY;
1688         }
1689
1690         return NETDEV_TX_OK;
1691 fail:
1692         if (ptask)
1693                 kmem_cache_free(packet_task_cache, ptask);
1694
1695         if (skb != NULL)
1696                 dev_kfree_skb(skb);
1697
1698         spin_lock_irqsave(&priv->lock, flags);
1699         priv->stats.tx_dropped++;
1700         priv->stats.tx_errors++;
1701         spin_unlock_irqrestore(&priv->lock, flags);
1702
1703         /*
1704          * FIXME: According to a patch from 2003-02-26, "returning non-zero
1705          * causes serious problems" here, allegedly.  Before that patch,
1706          * -ERRNO was returned which is not appropriate under Linux 2.6.
1707          * Perhaps more needs to be done?  Stop the queue in serious
1708          * conditions and restart it elsewhere?
1709          */
1710         /* return NETDEV_TX_BUSY; */
1711         return NETDEV_TX_OK;
1712 }
1713
1714 static void ether1394_get_drvinfo(struct net_device *dev,
1715                                   struct ethtool_drvinfo *info)
1716 {
1717         strcpy(info->driver, driver_name);
1718         strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */
1719 }
1720
1721 static struct ethtool_ops ethtool_ops = {
1722         .get_drvinfo = ether1394_get_drvinfo
1723 };
1724
1725 static int __init ether1394_init_module(void)
1726 {
1727         int err;
1728
1729         packet_task_cache = kmem_cache_create("packet_task",
1730                                               sizeof(struct packet_task),
1731                                               0, 0, NULL);
1732         if (!packet_task_cache)
1733                 return -ENOMEM;
1734
1735         hpsb_register_highlevel(&eth1394_highlevel);
1736         err = hpsb_register_protocol(&eth1394_proto_driver);
1737         if (err) {
1738                 hpsb_unregister_highlevel(&eth1394_highlevel);
1739                 kmem_cache_destroy(packet_task_cache);
1740         }
1741         return err;
1742 }
1743
1744 static void __exit ether1394_exit_module(void)
1745 {
1746         hpsb_unregister_protocol(&eth1394_proto_driver);
1747         hpsb_unregister_highlevel(&eth1394_highlevel);
1748         kmem_cache_destroy(packet_task_cache);
1749 }
1750
1751 module_init(ether1394_init_module);
1752 module_exit(ether1394_exit_module);