Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1801 insertions, 0 deletions

diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c
new file mode 100644
index 000000000000..654da76bf811
--- /dev/null
+++ b/drivers/ieee1394/eth1394.c
@@ -0,0 +1,1801 @@
+/*
+ * eth1394.c -- Ethernet driver for Linux IEEE-1394 Subsystem
+ *
+ * Copyright (C) 2001-2003 Ben Collins <bcollins@debian.org>
+ *               2000 Bonin Franck <boninf@free.fr>
+ *               2003 Steve Kinneberg <kinnebergsteve@acmsystems.com>
+ *
+ * Mainly based on work by Emanuel Pirker and Andreas E. Bombe
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/* This driver intends to support RFC 2734, which describes a method for
+ * transporting IPv4 datagrams over IEEE-1394 serial busses. This driver
+ * will ultimately support that method, but currently falls short in
+ * several areas.
+ *
+ * TODO:
+ * RFC 2734 related:
+ * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
+ *
+ * Non-RFC 2734 related:
+ * - Handle fragmented skb's coming from the networking layer.
+ * - Move generic GASP reception to core 1394 code
+ * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
+ * - Stability improvements
+ * - Performance enhancements
+ * - Consider garbage collecting old partial datagrams after X amount of time
+ */
+
+
+#include <linux/module.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+#include <linux/ethtool.h>
+#include <asm/uaccess.h>
+#include <asm/delay.h>
+#include <asm/semaphore.h>
+#include <net/arp.h>
+
+#include "csr1212.h"
+#include "ieee1394_types.h"
+#include "ieee1394_core.h"
+#include "ieee1394_transactions.h"
+#include "ieee1394.h"
+#include "highlevel.h"
+#include "iso.h"
+#include "nodemgr.h"
+#include "eth1394.h"
+#include "config_roms.h"
+
+#define ETH1394_PRINT_G(level, fmt, args...) \
+	printk(level "%s: " fmt, driver_name, ## args)
+
+#define ETH1394_PRINT(level, dev_name, fmt, args...) \
+	printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
+
+#define DEBUG(fmt, args...) \
+	printk(KERN_ERR "%s:%s[%d]: " fmt "\n", driver_name, __FUNCTION__, __LINE__, ## args)
+#define TRACE() printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)
+
+static char version[] __devinitdata =
+	"$Rev: 1247 $ Ben Collins <bcollins@debian.org>";
+
+struct fragment_info {
+	struct list_head list;
+	int offset;
+	int len;
+};
+
+struct partial_datagram {
+	struct list_head list;
+	u16 dgl;
+	u16 dg_size;
+	u16 ether_type;
+	struct sk_buff *skb;
+	char *pbuf;
+	struct list_head frag_info;
+};
+
+struct pdg_list {
+	struct list_head list;		/* partial datagram list per node	*/
+	unsigned int sz;		/* partial datagram list size per node	*/
+	spinlock_t lock;		/* partial datagram lock		*/
+};
+
+struct eth1394_host_info {
+	struct hpsb_host *host;
+	struct net_device *dev;
+};
+
+struct eth1394_node_ref {
+	struct unit_directory *ud;
+	struct list_head list;
+};
+
+struct eth1394_node_info {
+	u16 maxpayload;			/* Max payload			*/
+	u8 sspd;			/* Max speed			*/
+	u64 fifo;			/* FIFO address			*/
+	struct pdg_list pdg;		/* partial RX datagram lists	*/
+	int dgl;			/* Outgoing datagram label	*/
+};
+
+/* Our ieee1394 highlevel driver */
+#define ETH1394_DRIVER_NAME "eth1394"
+static const char driver_name[] = ETH1394_DRIVER_NAME;
+
+static kmem_cache_t *packet_task_cache;
+
+static struct hpsb_highlevel eth1394_highlevel;
+
+/* Use common.lf to determine header len */
+static const int hdr_type_len[] = {
+	sizeof (struct eth1394_uf_hdr),
+	sizeof (struct eth1394_ff_hdr),
+	sizeof (struct eth1394_sf_hdr),
+	sizeof (struct eth1394_sf_hdr)
+};
+
+/* Change this to IEEE1394_SPEED_S100 to make testing easier */
+#define ETH1394_SPEED_DEF	IEEE1394_SPEED_MAX
+
+/* For now, this needs to be 1500, so that XP works with us */
+#define ETH1394_DATA_LEN	ETH_DATA_LEN
+
+static const u16 eth1394_speedto_maxpayload[] = {
+/*     S100, S200, S400, S800, S1600, S3200 */
+	512, 1024, 2048, 4096,  4096,  4096
+};
+
+MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
+MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
+MODULE_LICENSE("GPL");
+
+/* The max_partial_datagrams parameter is the maximum number of fragmented
+ * datagrams per node that eth1394 will keep in memory.  Providing an upper
+ * bound allows us to limit the amount of memory that partial datagrams
+ * consume in the event that some partial datagrams are never completed.
+ */
+static int max_partial_datagrams = 25;
+module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(max_partial_datagrams,
+		 "Maximum number of partially received fragmented datagrams "
+		 "(default = 25).");
+
+
+static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
+			    unsigned short type, void *daddr, void *saddr,
+			    unsigned len);
+static int ether1394_rebuild_header(struct sk_buff *skb);
+static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr);
+static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh);
+static void ether1394_header_cache_update(struct hh_cache *hh,
+					  struct net_device *dev,
+					  unsigned char * haddr);
+static int ether1394_mac_addr(struct net_device *dev, void *p);
+
+static void purge_partial_datagram(struct list_head *old);
+static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
+static void ether1394_iso(struct hpsb_iso *iso);
+
+static struct ethtool_ops ethtool_ops;
+
+static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
+			   quadlet_t *data, u64 addr, size_t len, u16 flags);
+static void ether1394_add_host (struct hpsb_host *host);
+static void ether1394_remove_host (struct hpsb_host *host);
+static void ether1394_host_reset (struct hpsb_host *host);
+
+/* Function for incoming 1394 packets */
+static struct hpsb_address_ops addr_ops = {
+	.write =	ether1394_write,
+};
+
+/* Ieee1394 highlevel driver functions */
+static struct hpsb_highlevel eth1394_highlevel = {
+	.name =		driver_name,
+	.add_host =	ether1394_add_host,
+	.remove_host =	ether1394_remove_host,
+	.host_reset =	ether1394_host_reset,
+};
+
+
+/* This is called after an "ifup" */
+static int ether1394_open (struct net_device *dev)
+{
+	struct eth1394_priv *priv = netdev_priv(dev);
+	int ret = 0;
+
+	/* Something bad happened, don't even try */
+	if (priv->bc_state == ETHER1394_BC_ERROR) {
+		/* we'll try again */
+		priv->iso = hpsb_iso_recv_init(priv->host,
+					       ETHER1394_GASP_BUFFERS * 2 *
+					       (1 << (priv->host->csr.max_rec +
+						      1)),
+					       ETHER1394_GASP_BUFFERS,
+					       priv->broadcast_channel,
+					       HPSB_ISO_DMA_PACKET_PER_BUFFER,
+					       1, ether1394_iso);
+		if (priv->iso == NULL) {
+			ETH1394_PRINT(KERN_ERR, dev->name,
+				      "Could not allocate isochronous receive "
+				      "context for the broadcast channel\n");
+			priv->bc_state = ETHER1394_BC_ERROR;
+			ret = -EAGAIN;
+		} else {
+			if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
+				priv->bc_state = ETHER1394_BC_STOPPED;
+			else
+				priv->bc_state = ETHER1394_BC_RUNNING;
+		}
+	}
+
+	if (ret)
+		return ret;
+
+	netif_start_queue (dev);
+	return 0;
+}
+
+/* This is called after an "ifdown" */
+static int ether1394_stop (struct net_device *dev)
+{
+	netif_stop_queue (dev);
+	return 0;
+}
+
+/* Return statistics to the caller */
+static struct net_device_stats *ether1394_stats (struct net_device *dev)
+{
+	return &(((struct eth1394_priv *)netdev_priv(dev))->stats);
+}
+
+/* What to do if we timeout. I think a host reset is probably in order, so
+ * that's what we do. Should we increment the stat counters too?  */
+static void ether1394_tx_timeout (struct net_device *dev)
+{
+	ETH1394_PRINT (KERN_ERR, dev->name, "Timeout, resetting host %s\n",
+		       ((struct eth1394_priv *)netdev_priv(dev))->host->driver->name);
+
+	highlevel_host_reset (((struct eth1394_priv *)netdev_priv(dev))->host);
+
+	netif_wake_queue (dev);
+}
+
+static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct eth1394_priv *priv = netdev_priv(dev);
+
+	if ((new_mtu < 68) ||
+	    (new_mtu > min(ETH1394_DATA_LEN,
+			   (int)((1 << (priv->host->csr.max_rec + 1)) -
+				 (sizeof(union eth1394_hdr) +
+				  ETHER1394_GASP_OVERHEAD)))))
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static void purge_partial_datagram(struct list_head *old)
+{
+	struct partial_datagram *pd = list_entry(old, struct partial_datagram, list);
+	struct list_head *lh, *n;
+
+	list_for_each_safe(lh, n, &pd->frag_info) {
+		struct fragment_info *fi = list_entry(lh, struct fragment_info, list);
+		list_del(lh);
+		kfree(fi);
+	}
+	list_del(old);
+	kfree_skb(pd->skb);
+	kfree(pd);
+}
+
+/******************************************
+ * 1394 bus activity functions
+ ******************************************/
+
+static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
+						  struct unit_directory *ud)
+{
+	struct eth1394_node_ref *node;
+
+	list_for_each_entry(node, inl, list)
+		if (node->ud == ud)
+			return node;
+
+	return NULL;
+}
+
+static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
+						       u64 guid)
+{
+	struct eth1394_node_ref *node;
+
+	list_for_each_entry(node, inl, list)
+		if (node->ud->ne->guid == guid)
+			return node;
+
+	return NULL;
+}
+
+static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
+							 nodeid_t nodeid)
+{
+	struct eth1394_node_ref *node;
+	list_for_each_entry(node, inl, list) {
+		if (node->ud->ne->nodeid == nodeid)
+			return node;
+	}
+
+	return NULL;
+}
+
+static int eth1394_probe(struct device *dev)
+{
+	struct unit_directory *ud;
+	struct eth1394_host_info *hi;
+	struct eth1394_priv *priv;
+	struct eth1394_node_ref *new_node;
+	struct eth1394_node_info *node_info;
+
+	ud = container_of(dev, struct unit_directory, device);
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
+	if (!hi)
+		return -ENOENT;
+
+	new_node = kmalloc(sizeof(struct eth1394_node_ref),
+			   in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!new_node)
+		return -ENOMEM;
+
+	node_info = kmalloc(sizeof(struct eth1394_node_info),
+			    in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+	if (!node_info) {
+		kfree(new_node);
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&node_info->pdg.lock);
+	INIT_LIST_HEAD(&node_info->pdg.list);
+	node_info->pdg.sz = 0;
+	node_info->fifo = ETHER1394_INVALID_ADDR;
+
+	ud->device.driver_data = node_info;
+	new_node->ud = ud;
+
+	priv = netdev_priv(hi->dev);
+	list_add_tail(&new_node->list, &priv->ip_node_list);
+
+	return 0;
+}
+
+static int eth1394_remove(struct device *dev)
+{
+	struct unit_directory *ud;
+	struct eth1394_host_info *hi;
+	struct eth1394_priv *priv;
+	struct eth1394_node_ref *old_node;
+	struct eth1394_node_info *node_info;
+	struct list_head *lh, *n;
+	unsigned long flags;
+
+	ud = container_of(dev, struct unit_directory, device);
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
+	if (!hi)
+		return -ENOENT;
+
+	priv = netdev_priv(hi->dev);
+
+	old_node = eth1394_find_node(&priv->ip_node_list, ud);
+
+	if (old_node) {
+		list_del(&old_node->list);
+		kfree(old_node);
+
+		node_info = (struct eth1394_node_info*)ud->device.driver_data;
+
+		spin_lock_irqsave(&node_info->pdg.lock, flags);
+		/* The partial datagram list should be empty, but we'll just
+		 * make sure anyway... */
+		list_for_each_safe(lh, n, &node_info->pdg.list) {
+			purge_partial_datagram(lh);
+		}
+		spin_unlock_irqrestore(&node_info->pdg.lock, flags);
+
+		kfree(node_info);
+		ud->device.driver_data = NULL;
+	}
+	return 0;
+}
+
+static int eth1394_update(struct unit_directory *ud)
+{
+	struct eth1394_host_info *hi;
+	struct eth1394_priv *priv;
+	struct eth1394_node_ref *node;
+	struct eth1394_node_info *node_info;
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, ud->ne->host);
+	if (!hi)
+		return -ENOENT;
+
+	priv = netdev_priv(hi->dev);
+
+	node = eth1394_find_node(&priv->ip_node_list, ud);
+
+	if (!node) {
+		node = kmalloc(sizeof(struct eth1394_node_ref),
+			       in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+		if (!node)
+			return -ENOMEM;
+
+		node_info = kmalloc(sizeof(struct eth1394_node_info),
+				    in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+		if (!node_info) {
+			kfree(node);
+			return -ENOMEM;
+		}
+
+		spin_lock_init(&node_info->pdg.lock);
+		INIT_LIST_HEAD(&node_info->pdg.list);
+		node_info->pdg.sz = 0;
+
+		ud->device.driver_data = node_info;
+		node->ud = ud;
+
+		priv = netdev_priv(hi->dev);
+		list_add_tail(&node->list, &priv->ip_node_list);
+	}
+
+	return 0;
+}
+
+
+static struct ieee1394_device_id eth1394_id_table[] = {
+	{
+		.match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
+				IEEE1394_MATCH_VERSION),
+		.specifier_id =	ETHER1394_GASP_SPECIFIER_ID,
+		.version = ETHER1394_GASP_VERSION,
+	},
+	{}
+};
+
+MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
+
+static struct hpsb_protocol_driver eth1394_proto_driver = {
+	.name		= "IPv4 over 1394 Driver",
+	.id_table	= eth1394_id_table,
+	.update		= eth1394_update,
+	.driver		= {
+		.name		= ETH1394_DRIVER_NAME,
+		.bus		= &ieee1394_bus_type,
+		.probe		= eth1394_probe,
+		.remove		= eth1394_remove,
+	},
+};
+
+
+static void ether1394_reset_priv (struct net_device *dev, int set_mtu)
+{
+	unsigned long flags;
+	int i;
+	struct eth1394_priv *priv = netdev_priv(dev);
+	struct hpsb_host *host = priv->host;
+	u64 guid = *((u64*)&(host->csr.rom->bus_info_data[3]));
+	u16 maxpayload = 1 << (host->csr.max_rec + 1);
+	int max_speed = IEEE1394_SPEED_MAX;
+
+	spin_lock_irqsave (&priv->lock, flags);
+
+	memset(priv->ud_list, 0, sizeof(struct node_entry*) * ALL_NODES);
+	priv->bc_maxpayload = 512;
+
+	/* Determine speed limit */
+	for (i = 0; i < host->node_count; i++)
+		if (max_speed > host->speed_map[NODEID_TO_NODE(host->node_id) *
+						64 + i])
+			max_speed = host->speed_map[NODEID_TO_NODE(host->node_id) *
+						    64 + i];
+	priv->bc_sspd = max_speed;
+
+	/* We'll use our maxpayload as the default mtu */
+	if (set_mtu) {
+		dev->mtu = min(ETH1394_DATA_LEN,
+			       (int)(maxpayload -
+				     (sizeof(union eth1394_hdr) +
+				      ETHER1394_GASP_OVERHEAD)));
+
+		/* Set our hardware address while we're at it */
+		*(u64*)dev->dev_addr = guid;
+		*(u64*)dev->broadcast = ~0x0ULL;
+	}
+
+	spin_unlock_irqrestore (&priv->lock, flags);
+}
+
+/* This function is called right before register_netdev */
+static void ether1394_init_dev (struct net_device *dev)
+{
+	/* Our functions */
+	dev->open		= ether1394_open;
+	dev->stop		= ether1394_stop;
+	dev->hard_start_xmit	= ether1394_tx;
+	dev->get_stats		= ether1394_stats;
+	dev->tx_timeout		= ether1394_tx_timeout;
+	dev->change_mtu		= ether1394_change_mtu;
+
+	dev->hard_header	= ether1394_header;
+	dev->rebuild_header	= ether1394_rebuild_header;
+	dev->hard_header_cache	= ether1394_header_cache;
+	dev->header_cache_update= ether1394_header_cache_update;
+	dev->hard_header_parse	= ether1394_header_parse;
+	dev->set_mac_address	= ether1394_mac_addr;
+	SET_ETHTOOL_OPS(dev, &ethtool_ops);
+
+	/* Some constants */
+	dev->watchdog_timeo	= ETHER1394_TIMEOUT;
+	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;
+	dev->features		= NETIF_F_HIGHDMA;
+	dev->addr_len		= ETH1394_ALEN;
+	dev->hard_header_len 	= ETH1394_HLEN;
+	dev->type		= ARPHRD_IEEE1394;
+
+	ether1394_reset_priv (dev, 1);
+}
+
+/*
+ * This function is called every time a card is found. It is generally called
+ * when the module is installed. This is where we add all of our ethernet
+ * devices. One for each host.
+ */
+static void ether1394_add_host (struct hpsb_host *host)
+{
+	struct eth1394_host_info *hi = NULL;
+	struct net_device *dev = NULL;
+	struct eth1394_priv *priv;
+	static int version_printed = 0;
+	u64 fifo_addr;
+
+	if (!(host->config_roms & HPSB_CONFIG_ROM_ENTRY_IP1394))
+		return;
+
+	fifo_addr = hpsb_allocate_and_register_addrspace(&eth1394_highlevel,
+							 host,
+							 &addr_ops,
+							 ETHER1394_REGION_ADDR_LEN,
+							 ETHER1394_REGION_ADDR_LEN,
+							 -1, -1);
+	if (fifo_addr == ~0ULL)
+		goto out;
+
+	if (version_printed++ == 0)
+		ETH1394_PRINT_G (KERN_INFO, "%s\n", version);
+
+	/* We should really have our own alloc_hpsbdev() function in
+	 * net_init.c instead of calling the one for ethernet then hijacking
+	 * it for ourselves.  That way we'd be a real networking device. */
+	dev = alloc_etherdev(sizeof (struct eth1394_priv));
+
+	if (dev == NULL) {
+		ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to allocate "
+				 "etherdevice for IEEE 1394 device %s-%d\n",
+				 host->driver->name, host->id);
+		goto out;
+        }
+
+	SET_MODULE_OWNER(dev);
+	SET_NETDEV_DEV(dev, &host->device);
+
+	priv = netdev_priv(dev);
+
+	INIT_LIST_HEAD(&priv->ip_node_list);
+
+	spin_lock_init(&priv->lock);
+	priv->host = host;
+	priv->local_fifo = fifo_addr;
+
+	hi = hpsb_create_hostinfo(&eth1394_highlevel, host, sizeof(*hi));
+
+	if (hi == NULL) {
+		ETH1394_PRINT_G (KERN_ERR, "Out of memory trying to create "
+				 "hostinfo for IEEE 1394 device %s-%d\n",
+				 host->driver->name, host->id);
+		goto out;
+        }
+
+	ether1394_init_dev(dev);
+
+	if (register_netdev (dev)) {
+		ETH1394_PRINT (KERN_ERR, dev->name, "Error registering network driver\n");
+		goto out;
+	}
+
+	ETH1394_PRINT (KERN_INFO, dev->name, "IEEE-1394 IPv4 over 1394 Ethernet (fw-host%d)\n",
+		       host->id);
+
+	hi->host = host;
+	hi->dev = dev;
+
+	/* Ignore validity in hopes that it will be set in the future.  It'll
+	 * be checked when the eth device is opened. */
+	priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
+
+	priv->iso = hpsb_iso_recv_init(host, (ETHER1394_GASP_BUFFERS * 2 *
+					      (1 << (host->csr.max_rec + 1))),
+				       ETHER1394_GASP_BUFFERS,
+				       priv->broadcast_channel,
+				       HPSB_ISO_DMA_PACKET_PER_BUFFER,
+				       1, ether1394_iso);
+	if (priv->iso == NULL) {
+		ETH1394_PRINT(KERN_ERR, dev->name,
+			      "Could not allocate isochronous receive context "
+			      "for the broadcast channel\n");
+		priv->bc_state = ETHER1394_BC_ERROR;
+	} else {
+		if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
+			priv->bc_state = ETHER1394_BC_STOPPED;
+		else
+			priv->bc_state = ETHER1394_BC_RUNNING;
+	}
+
+	return;
+
+out:
+	if (dev != NULL)
+		free_netdev(dev);
+	if (hi)
+		hpsb_destroy_hostinfo(&eth1394_highlevel, host);
+
+	return;
+}
+
+/* Remove a card from our list */
+static void ether1394_remove_host (struct hpsb_host *host)
+{
+	struct eth1394_host_info *hi;
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
+	if (hi != NULL) {
+		struct eth1394_priv *priv = netdev_priv(hi->dev);
+
+		hpsb_unregister_addrspace(&eth1394_highlevel, host,
+					  priv->local_fifo);
+
+		if (priv->iso != NULL)
+			hpsb_iso_shutdown(priv->iso);
+
+		if (hi->dev) {
+			unregister_netdev (hi->dev);
+			free_netdev(hi->dev);
+		}
+	}
+
+	return;
+}
+
+/* A reset has just arisen */
+static void ether1394_host_reset (struct hpsb_host *host)
+{
+	struct eth1394_host_info *hi;
+	struct eth1394_priv *priv;
+	struct net_device *dev;
+	struct list_head *lh, *n;
+	struct eth1394_node_ref *node;
+	struct eth1394_node_info *node_info;
+	unsigned long flags;
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
+
+	/* This can happen for hosts that we don't use */
+	if (hi == NULL)
+		return;
+
+	dev = hi->dev;
+	priv = netdev_priv(dev);
+
+	/* Reset our private host data, but not our mtu */
+	netif_stop_queue (dev);
+	ether1394_reset_priv (dev, 0);
+
+	list_for_each_entry(node, &priv->ip_node_list, list) {
+		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
+
+		spin_lock_irqsave(&node_info->pdg.lock, flags);
+
+		list_for_each_safe(lh, n, &node_info->pdg.list) {
+			purge_partial_datagram(lh);
+		}
+
+		INIT_LIST_HEAD(&(node_info->pdg.list));
+		node_info->pdg.sz = 0;
+
+		spin_unlock_irqrestore(&node_info->pdg.lock, flags);
+	}
+
+	netif_wake_queue (dev);
+}
+
+/******************************************
+ * HW Header net device functions
+ ******************************************/
+/* These functions have been adapted from net/ethernet/eth.c */
+
+
+/* Create a fake MAC header for an arbitrary protocol layer.
+ * saddr=NULL means use device source address
+ * daddr=NULL means leave destination address (eg unresolved arp). */
+static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
+			    unsigned short type, void *daddr, void *saddr,
+			    unsigned len)
+{
+	struct eth1394hdr *eth = (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
+
+	eth->h_proto = htons(type);
+
+	if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) {
+		memset(eth->h_dest, 0, dev->addr_len);
+		return(dev->hard_header_len);
+	}
+
+	if (daddr) {
+		memcpy(eth->h_dest,daddr,dev->addr_len);
+		return dev->hard_header_len;
+	}
+
+	return -dev->hard_header_len;
+
+}
+
+
+/* Rebuild the faked MAC header. This is called after an ARP
+ * (or in future other address resolution) has completed on this
+ * sk_buff. We now let ARP fill in the other fields.
+ *
+ * This routine CANNOT use cached dst->neigh!
+ * Really, it is used only when dst->neigh is wrong.
+ */
+static int ether1394_rebuild_header(struct sk_buff *skb)
+{
+	struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
+	struct net_device *dev = skb->dev;
+
+	switch (eth->h_proto) {
+
+#ifdef CONFIG_INET
+	case __constant_htons(ETH_P_IP):
+ 		return arp_find((unsigned char*)&eth->h_dest, skb);
+#endif
+	default:
+		ETH1394_PRINT(KERN_DEBUG, dev->name,
+			      "unable to resolve type %04x addresses.\n",
+			      eth->h_proto);
+		break;
+	}
+
+	return 0;
+}
+
+static int ether1394_header_parse(struct sk_buff *skb, unsigned char *haddr)
+{
+	struct net_device *dev = skb->dev;
+	memcpy(haddr, dev->dev_addr, ETH1394_ALEN);
+	return ETH1394_ALEN;
+}
+
+
+static int ether1394_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+{
+	unsigned short type = hh->hh_type;
+	struct eth1394hdr *eth = (struct eth1394hdr*)(((u8*)hh->hh_data) +
+						      (16 - ETH1394_HLEN));
+	struct net_device *dev = neigh->dev;
+
+	if (type == __constant_htons(ETH_P_802_3)) {
+		return -1;
+	}
+
+	eth->h_proto = type;
+	memcpy(eth->h_dest, neigh->ha, dev->addr_len);
+
+	hh->hh_len = ETH1394_HLEN;
+	return 0;
+}
+
+/* Called by Address Resolution module to notify changes in address. */
+static void ether1394_header_cache_update(struct hh_cache *hh,
+					  struct net_device *dev,
+					  unsigned char * haddr)
+{
+	memcpy(((u8*)hh->hh_data) + (16 - ETH1394_HLEN), haddr, dev->addr_len);
+}
+
+static int ether1394_mac_addr(struct net_device *dev, void *p)
+{
+	if (netif_running(dev))
+		return -EBUSY;
+
+	/* Not going to allow setting the MAC address, we really need to use
+	 * the real one supplied by the hardware */
+	 return -EINVAL;
+ }
+
+
+
+/******************************************
+ * Datagram reception code
+ ******************************************/
+
+/* Copied from net/ethernet/eth.c */
+static inline u16 ether1394_type_trans(struct sk_buff *skb,
+				       struct net_device *dev)
+{
+	struct eth1394hdr *eth;
+	unsigned char *rawp;
+
+	skb->mac.raw = skb->data;
+	skb_pull (skb, ETH1394_HLEN);
+	eth = eth1394_hdr(skb);
+
+	if (*eth->h_dest & 1) {
+		if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len)==0)
+			skb->pkt_type = PACKET_BROADCAST;
+#if 0
+		else
+			skb->pkt_type = PACKET_MULTICAST;
+#endif
+	} else {
+		if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
+			skb->pkt_type = PACKET_OTHERHOST;
+        }
+
+	if (ntohs (eth->h_proto) >= 1536)
+		return eth->h_proto;
+
+	rawp = skb->data;
+
+        if (*(unsigned short *)rawp == 0xFFFF)
+		return htons (ETH_P_802_3);
+
+        return htons (ETH_P_802_2);
+}
+
+/* Parse an encapsulated IP1394 header into an ethernet frame packet.
+ * We also perform ARP translation here, if need be.  */
+static inline u16 ether1394_parse_encap(struct sk_buff *skb,
+					struct net_device *dev,
+					nodeid_t srcid, nodeid_t destid,
+					u16 ether_type)
+{
+	struct eth1394_priv *priv = netdev_priv(dev);
+	u64 dest_hw;
+	unsigned short ret = 0;
+
+	/* Setup our hw addresses. We use these to build the
+	 * ethernet header.  */
+	if (destid == (LOCAL_BUS | ALL_NODES))
+		dest_hw = ~0ULL;  /* broadcast */
+	else
+		dest_hw = cpu_to_be64((((u64)priv->host->csr.guid_hi) << 32) |
+				      priv->host->csr.guid_lo);
+
+	/* If this is an ARP packet, convert it. First, we want to make
+	 * use of some of the fields, since they tell us a little bit
+	 * about the sending machine.  */
+	if (ether_type == __constant_htons (ETH_P_ARP)) {
+		struct eth1394_arp *arp1394 = (struct eth1394_arp*)skb->data;
+		struct arphdr *arp = (struct arphdr *)skb->data;
+		unsigned char *arp_ptr = (unsigned char *)(arp + 1);
+		u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
+			ntohl(arp1394->fifo_lo);
+		u8 max_rec = min(priv->host->csr.max_rec,
+				 (u8)(arp1394->max_rec));
+		int sspd = arp1394->sspd;
+		u16 maxpayload;
+		struct eth1394_node_ref *node;
+		struct eth1394_node_info *node_info;
+
+		/* Sanity check. MacOSX seems to be sending us 131 in this
+		 * field (atleast on my Panther G5). Not sure why. */
+		if (sspd > 5 || sspd < 0)
+			sspd = 0;
+
+		maxpayload = min(eth1394_speedto_maxpayload[sspd], (u16)(1 << (max_rec + 1)));
+
+		node = eth1394_find_node_guid(&priv->ip_node_list,
+					      be64_to_cpu(arp1394->s_uniq_id));
+		if (!node) {
+			return 0;
+		}
+
+		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
+
+		/* Update our speed/payload/fifo_offset table */
+		node_info->maxpayload =	maxpayload;
+		node_info->sspd =	sspd;
+		node_info->fifo =	fifo_addr;
+
+		/* Now that we're done with the 1394 specific stuff, we'll
+		 * need to alter some of the data.  Believe it or not, all
+		 * that needs to be done is sender_IP_address needs to be
+		 * moved, the destination hardware address get stuffed
+		 * in and the hardware address length set to 8.
+		 *
+		 * IMPORTANT: The code below overwrites 1394 specific data
+		 * needed above so keep the munging of the data for the
+		 * higher level IP stack last. */
+
+		arp->ar_hln = 8;
+		arp_ptr += arp->ar_hln;		/* skip over sender unique id */
+		*(u32*)arp_ptr = arp1394->sip;	/* move sender IP addr */
+		arp_ptr += arp->ar_pln;		/* skip over sender IP addr */
+
+		if (arp->ar_op == 1)
+			/* just set ARP req target unique ID to 0 */
+			*((u64*)arp_ptr) = 0;
+		else
+			*((u64*)arp_ptr) = *((u64*)dev->dev_addr);
+	}
+
+	/* Now add the ethernet header. */
+	if (dev->hard_header (skb, dev, __constant_ntohs (ether_type),
+			      &dest_hw, NULL, skb->len) >= 0)
+		ret = ether1394_type_trans(skb, dev);
+
+	return ret;
+}
+
+static inline int fragment_overlap(struct list_head *frag_list, int offset, int len)
+{
+	struct fragment_info *fi;
+
+	list_for_each_entry(fi, frag_list, list) {
+		if ( ! ((offset > (fi->offset + fi->len - 1)) ||
+		       ((offset + len - 1) < fi->offset)))
+			return 1;
+	}
+	return 0;
+}
+
+static inline struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
+{
+	struct partial_datagram *pd;
+
+	list_for_each_entry(pd, pdgl, list) {
+		if (pd->dgl == dgl)
+			return &pd->list;
+	}
+	return NULL;
+}
+
+/* Assumes that new fragment does not overlap any existing fragments */
+static inline int new_fragment(struct list_head *frag_info, int offset, int len)
+{
+	struct list_head *lh;
+	struct fragment_info *fi, *fi2, *new;
+
+	list_for_each(lh, frag_info) {
+		fi = list_entry(lh, struct fragment_info, list);
+		if ((fi->offset + fi->len) == offset) {
+			/* The new fragment can be tacked on to the end */
+			fi->len += len;
+			/* Did the new fragment plug a hole? */
+			fi2 = list_entry(lh->next, struct fragment_info, list);
+			if ((fi->offset + fi->len) == fi2->offset) {
+				/* glue fragments together */
+				fi->len += fi2->len;
+				list_del(lh->next);
+				kfree(fi2);
+			}
+			return 0;
+		} else if ((offset + len) == fi->offset) {
+			/* The new fragment can be tacked on to the beginning */
+			fi->offset = offset;
+			fi->len += len;
+			/* Did the new fragment plug a hole? */
+			fi2 = list_entry(lh->prev, struct fragment_info, list);
+			if ((fi2->offset + fi2->len) == fi->offset) {
+				/* glue fragments together */
+				fi2->len += fi->len;
+				list_del(lh);
+				kfree(fi);
+			}
+			return 0;
+		} else if (offset > (fi->offset + fi->len)) {
+			break;
+		} else if ((offset + len) < fi->offset) {
+			lh = lh->prev;
+			break;
+		}
+	}
+
+	new = kmalloc(sizeof(struct fragment_info), GFP_ATOMIC);
+	if (!new)
+		return -ENOMEM;
+
+	new->offset = offset;
+	new->len = len;
+
+	list_add(&new->list, lh);
+
+	return 0;
+}
+
+static inline int new_partial_datagram(struct net_device *dev,
+				       struct list_head *pdgl, int dgl,
+				       int dg_size, char *frag_buf,
+				       int frag_off, int frag_len)
+{
+	struct partial_datagram *new;
+
+	new = kmalloc(sizeof(struct partial_datagram), GFP_ATOMIC);
+	if (!new)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&new->frag_info);
+
+	if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
+		kfree(new);
+		return -ENOMEM;
+	}
+
+	new->dgl = dgl;
+	new->dg_size = dg_size;
+
+	new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
+	if (!new->skb) {
+		struct fragment_info *fi = list_entry(new->frag_info.next,
+						      struct fragment_info,
+						      list);
+		kfree(fi);
+		kfree(new);
+		return -ENOMEM;
+	}
+
+	skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
+	new->pbuf = skb_put(new->skb, dg_size);
+	memcpy(new->pbuf + frag_off, frag_buf, frag_len);
+
+	list_add(&new->list, pdgl);
+
+	return 0;
+}
+
+static inline int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
+					  char *frag_buf, int frag_off, int frag_len)
+{
+	struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
+
+	if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0) {
+		return -ENOMEM;
+	}
+
+	memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
+
+	/* Move list entry to beginnig of list so that oldest partial
+	 * datagrams percolate to the end of the list */
+	list_del(lh);
+	list_add(lh, pdgl);
+
+	return 0;
+}
+
+static inline int is_datagram_complete(struct list_head *lh, int dg_size)
+{
+	struct partial_datagram *pd = list_entry(lh, struct partial_datagram, list);
+	struct fragment_info *fi = list_entry(pd->frag_info.next,
+					      struct fragment_info, list);
+
+	return (fi->len == dg_size);
+}
+
+/* Packet reception. We convert the IP1394 encapsulation header to an
+ * ethernet header, and fill it with some of our other fields. This is
+ * an incoming packet from the 1394 bus.  */
+static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
+				  char *buf, int len)
+{
+	struct sk_buff *skb;
+	unsigned long flags;
+	struct eth1394_priv *priv = netdev_priv(dev);
+	union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
+	u16 ether_type = 0;  /* initialized to clear warning */
+	int hdr_len;
+	struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
+	struct eth1394_node_info *node_info;
+
+	if (!ud) {
+		struct eth1394_node_ref *node;
+		node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
+		if (!node) {
+			HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
+				   "lookup failure: " NODE_BUS_FMT,
+				   NODE_BUS_ARGS(priv->host, srcid));
+			priv->stats.rx_dropped++;
+			return -1;
+		}
+		ud = node->ud;
+
+		priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
+	}
+
+	node_info = (struct eth1394_node_info*)ud->device.driver_data;
+
+	/* First, did we receive a fragmented or unfragmented datagram? */
+	hdr->words.word1 = ntohs(hdr->words.word1);
+
+	hdr_len = hdr_type_len[hdr->common.lf];
+
+	if (hdr->common.lf == ETH1394_HDR_LF_UF) {
+		/* An unfragmented datagram has been received by the ieee1394
+		 * bus. Build an skbuff around it so we can pass it to the
+		 * high level network layer. */
+
+		skb = dev_alloc_skb(len + dev->hard_header_len + 15);
+		if (!skb) {
+			HPSB_PRINT (KERN_ERR, "ether1394 rx: low on mem\n");
+			priv->stats.rx_dropped++;
+			return -1;
+		}
+		skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
+		memcpy(skb_put(skb, len - hdr_len), buf + hdr_len, len - hdr_len);
+		ether_type = hdr->uf.ether_type;
+	} else {
+		/* A datagram fragment has been received, now the fun begins. */
+
+		struct list_head *pdgl, *lh;
+		struct partial_datagram *pd;
+		int fg_off;
+		int fg_len = len - hdr_len;
+		int dg_size;
+		int dgl;
+		int retval;
+		struct pdg_list *pdg = &(node_info->pdg);
+
+		hdr->words.word3 = ntohs(hdr->words.word3);
+		/* The 4th header word is reserved so no need to do ntohs() */
+
+		if (hdr->common.lf == ETH1394_HDR_LF_FF) {
+			ether_type = hdr->ff.ether_type;
+			dgl = hdr->ff.dgl;
+			dg_size = hdr->ff.dg_size + 1;
+			fg_off = 0;
+		} else {
+			hdr->words.word2 = ntohs(hdr->words.word2);
+			dgl = hdr->sf.dgl;
+			dg_size = hdr->sf.dg_size + 1;
+			fg_off = hdr->sf.fg_off;
+		}
+		spin_lock_irqsave(&pdg->lock, flags);
+
+		pdgl = &(pdg->list);
+		lh = find_partial_datagram(pdgl, dgl);
+
+		if (lh == NULL) {
+			while (pdg->sz >= max_partial_datagrams) {
+				/* remove the oldest */
+				purge_partial_datagram(pdgl->prev);
+				pdg->sz--;
+			}
+
+			retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
+						      buf + hdr_len, fg_off,
+						      fg_len);
+			if (retval < 0) {
+				spin_unlock_irqrestore(&pdg->lock, flags);
+				goto bad_proto;
+			}
+			pdg->sz++;
+			lh = find_partial_datagram(pdgl, dgl);
+		} else {
+			struct partial_datagram *pd;
+
+			pd = list_entry(lh, struct partial_datagram, list);
+
+			if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
+				/* Overlapping fragments, obliterate old
+				 * datagram and start new one. */
+				purge_partial_datagram(lh);
+				retval = new_partial_datagram(dev, pdgl, dgl,
+							      dg_size,
+							      buf + hdr_len,
+							      fg_off, fg_len);
+				if (retval < 0) {
+					pdg->sz--;
+					spin_unlock_irqrestore(&pdg->lock, flags);
+					goto bad_proto;
+				}
+			} else {
+				retval = update_partial_datagram(pdgl, lh,
+								 buf + hdr_len,
+								 fg_off, fg_len);
+				if (retval < 0) {
+					/* Couldn't save off fragment anyway
+					 * so might as well obliterate the
+					 * datagram now. */
+					purge_partial_datagram(lh);
+					pdg->sz--;
+					spin_unlock_irqrestore(&pdg->lock, flags);
+					goto bad_proto;
+				}
+			} /* fragment overlap */
+		} /* new datagram or add to existing one */
+
+		pd = list_entry(lh, struct partial_datagram, list);
+
+		if (hdr->common.lf == ETH1394_HDR_LF_FF) {
+			pd->ether_type = ether_type;
+		}
+
+		if (is_datagram_complete(lh, dg_size)) {
+			ether_type = pd->ether_type;
+			pdg->sz--;
+			skb = skb_get(pd->skb);
+			purge_partial_datagram(lh);
+			spin_unlock_irqrestore(&pdg->lock, flags);
+		} else {
+			/* Datagram is not complete, we're done for the
+			 * moment. */
+			spin_unlock_irqrestore(&pdg->lock, flags);
+			return 0;
+		}
+	} /* unframgented datagram or fragmented one */
+
+	/* Write metadata, and then pass to the receive level */
+	skb->dev = dev;
+	skb->ip_summed = CHECKSUM_UNNECESSARY;	/* don't check it */
+
+	/* Parse the encapsulation header. This actually does the job of
+	 * converting to an ethernet frame header, aswell as arp
+	 * conversion if needed. ARP conversion is easier in this
+	 * direction, since we are using ethernet as our backend.  */
+	skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
+					      ether_type);
+
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (!skb->protocol) {
+		priv->stats.rx_errors++;
+		priv->stats.rx_dropped++;
+		dev_kfree_skb_any(skb);
+		goto bad_proto;
+	}
+
+	if (netif_rx(skb) == NET_RX_DROP) {
+		priv->stats.rx_errors++;
+		priv->stats.rx_dropped++;
+		goto bad_proto;
+	}
+
+	/* Statistics */
+	priv->stats.rx_packets++;
+	priv->stats.rx_bytes += skb->len;
+
+bad_proto:
+	if (netif_queue_stopped(dev))
+		netif_wake_queue(dev);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	dev->last_rx = jiffies;
+
+	return 0;
+}
+
+static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
+			   quadlet_t *data, u64 addr, size_t len, u16 flags)
+{
+	struct eth1394_host_info *hi;
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, host);
+	if (hi == NULL) {
+		ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
+				host->driver->name);
+		return RCODE_ADDRESS_ERROR;
+	}
+
+	if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
+		return RCODE_ADDRESS_ERROR;
+	else
+		return RCODE_COMPLETE;
+}
+
+static void ether1394_iso(struct hpsb_iso *iso)
+{
+	quadlet_t *data;
+	char *buf;
+	struct eth1394_host_info *hi;
+	struct net_device *dev;
+	struct eth1394_priv *priv;
+	unsigned int len;
+	u32 specifier_id;
+	u16 source_id;
+	int i;
+	int nready;
+
+	hi = hpsb_get_hostinfo(&eth1394_highlevel, iso->host);
+	if (hi == NULL) {
+		ETH1394_PRINT_G(KERN_ERR, "Could not find net device for host %s\n",
+				iso->host->driver->name);
+		return;
+	}
+
+	dev = hi->dev;
+
+	nready = hpsb_iso_n_ready(iso);
+	for (i = 0; i < nready; i++) {
+		struct hpsb_iso_packet_info *info =
+			&iso->infos[(iso->first_packet + i) % iso->buf_packets];
+		data = (quadlet_t*) (iso->data_buf.kvirt + info->offset);
+
+		/* skip over GASP header */
+		buf = (char *)data + 8;
+		len = info->len - 8;
+
+		specifier_id = (((be32_to_cpu(data[0]) & 0xffff) << 8) |
+				((be32_to_cpu(data[1]) & 0xff000000) >> 24));
+		source_id = be32_to_cpu(data[0]) >> 16;
+
+		priv = netdev_priv(dev);
+
+		if (info->channel != (iso->host->csr.broadcast_channel & 0x3f) ||
+		   specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
+			/* This packet is not for us */
+			continue;
+		}
+		ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
+				       buf, len);
+	}
+
+	hpsb_iso_recv_release_packets(iso, i);
+
+	dev->last_rx = jiffies;
+}
+
+/******************************************
+ * Datagram transmission code
+ ******************************************/
+
+/* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
+ * arphdr) is the same format as the ip1394 header, so they overlap.  The rest
+ * needs to be munged a bit.  The remainder of the arphdr is formatted based
+ * on hwaddr len and ipaddr len.  We know what they'll be, so it's easy to
+ * judge.
+ *
+ * Now that the EUI is used for the hardware address all we need to do to make
+ * this work for 1394 is to insert 2 quadlets that contain max_rec size,
+ * speed, and unicast FIFO address information between the sender_unique_id
+ * and the IP addresses.
+ */
+static inline void ether1394_arp_to_1394arp(struct sk_buff *skb,
+					    struct net_device *dev)
+{
+	struct eth1394_priv *priv = netdev_priv(dev);
+
+	struct arphdr *arp = (struct arphdr *)skb->data;
+	unsigned char *arp_ptr = (unsigned char *)(arp + 1);
+	struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
+
+	/* Believe it or not, all that need to happen is sender IP get moved
+	 * and set hw_addr_len, max_rec, sspd, fifo_hi and fifo_lo.  */
+	arp1394->hw_addr_len	= 16;
+	arp1394->sip		= *(u32*)(arp_ptr + ETH1394_ALEN);
+	arp1394->max_rec	= priv->host->csr.max_rec;
+	arp1394->sspd		= priv->host->csr.lnk_spd;
+	arp1394->fifo_hi	= htons (priv->local_fifo >> 32);
+	arp1394->fifo_lo	= htonl (priv->local_fifo & ~0x0);
+
+	return;
+}
+
+/* We need to encapsulate the standard header with our own. We use the
+ * ethernet header's proto for our own. */
+static inline unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
+						      int proto,
+						      union eth1394_hdr *hdr,
+						      u16 dg_size, u16 dgl)
+{
+	unsigned int adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
+
+	/* Does it all fit in one packet? */
+	if (dg_size <= adj_max_payload) {
+		hdr->uf.lf = ETH1394_HDR_LF_UF;
+		hdr->uf.ether_type = proto;
+	} else {
+		hdr->ff.lf = ETH1394_HDR_LF_FF;
+		hdr->ff.ether_type = proto;
+		hdr->ff.dg_size = dg_size - 1;
+		hdr->ff.dgl = dgl;
+		adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
+	}
+	return((dg_size + (adj_max_payload - 1)) / adj_max_payload);
+}
+
+static inline unsigned int ether1394_encapsulate(struct sk_buff *skb,
+						 unsigned int max_payload,
+						 union eth1394_hdr *hdr)
+{
+	union eth1394_hdr *bufhdr;
+	int ftype = hdr->common.lf;
+	int hdrsz = hdr_type_len[ftype];
+	unsigned int adj_max_payload = max_payload - hdrsz;
+
+	switch(ftype) {
+	case ETH1394_HDR_LF_UF:
+		bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
+		bufhdr->words.word1 = htons(hdr->words.word1);
+		bufhdr->words.word2 = hdr->words.word2;
+		break;
+
+	case ETH1394_HDR_LF_FF:
+		bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
+		bufhdr->words.word1 = htons(hdr->words.word1);
+		bufhdr->words.word2 = hdr->words.word2;
+		bufhdr->words.word3 = htons(hdr->words.word3);
+		bufhdr->words.word4 = 0;
+
+		/* Set frag type here for future interior fragments */
+		hdr->common.lf = ETH1394_HDR_LF_IF;
+		hdr->sf.fg_off = 0;
+		break;
+
+	default:
+		hdr->sf.fg_off += adj_max_payload;
+		bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
+		if (max_payload >= skb->len)
+			hdr->common.lf = ETH1394_HDR_LF_LF;
+		bufhdr->words.word1 = htons(hdr->words.word1);
+		bufhdr->words.word2 = htons(hdr->words.word2);
+		bufhdr->words.word3 = htons(hdr->words.word3);
+		bufhdr->words.word4 = 0;
+	}
+
+	return min(max_payload, skb->len);
+}
+
+static inline struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
+{
+	struct hpsb_packet *p;
+
+	p = hpsb_alloc_packet(0);
+	if (p) {
+		p->host = host;
+		p->generation = get_hpsb_generation(host);
+		p->type = hpsb_async;
+	}
+	return p;
+}
+
+static inline int ether1394_prep_write_packet(struct hpsb_packet *p,
+					      struct hpsb_host *host,
+					      nodeid_t node, u64 addr,
+					      void * data, int tx_len)
+{
+	p->node_id = node;
+	p->data = NULL;
+
+	p->tcode = TCODE_WRITEB;
+	p->header[1] = (host->node_id << 16) | (addr >> 32);
+	p->header[2] = addr & 0xffffffff;
+
+	p->header_size = 16;
+	p->expect_response = 1;
+
+	if (hpsb_get_tlabel(p)) {
+		ETH1394_PRINT_G(KERN_ERR, "No more tlabels left while sending "
+				"to node " NODE_BUS_FMT "\n", NODE_BUS_ARGS(host, node));
+		return -1;
+	}
+	p->header[0] = (p->node_id << 16) | (p->tlabel << 10)
+		| (1 << 8) | (TCODE_WRITEB << 4);
+
+	p->header[3] = tx_len << 16;
+	p->data_size = (tx_len + 3) & ~3;
+	p->data = (quadlet_t*)data;
+
+	return 0;
+}
+
+static inline void ether1394_prep_gasp_packet(struct hpsb_packet *p,
+					      struct eth1394_priv *priv,
+					      struct sk_buff *skb, int length)
+{
+	p->header_size = 4;
+	p->tcode = TCODE_STREAM_DATA;
+
+	p->header[0] = (length << 16) | (3 << 14)
+		| ((priv->broadcast_channel) << 8)
+		| (TCODE_STREAM_DATA << 4);
+	p->data_size = length;
+	p->data = ((quadlet_t*)skb->data) - 2;
+	p->data[0] = cpu_to_be32((priv->host->node_id << 16) |
+				 ETHER1394_GASP_SPECIFIER_ID_HI);
+	p->data[1] = __constant_cpu_to_be32((ETHER1394_GASP_SPECIFIER_ID_LO << 24) |
+					    ETHER1394_GASP_VERSION);
+
+	/* Setting the node id to ALL_NODES (not LOCAL_BUS | ALL_NODES)
+	 * prevents hpsb_send_packet() from setting the speed to an arbitrary
+	 * value based on packet->node_id if packet->node_id is not set. */
+	p->node_id = ALL_NODES;
+	p->speed_code = priv->bc_sspd;
+}
+
+static inline void ether1394_free_packet(struct hpsb_packet *packet)
+{
+	if (packet->tcode != TCODE_STREAM_DATA)
+		hpsb_free_tlabel(packet);
+	hpsb_free_packet(packet);
+}
+
+static void ether1394_complete_cb(void *__ptask);
+
+static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
+{
+	struct eth1394_priv *priv = ptask->priv;
+	struct hpsb_packet *packet = NULL;
+
+	packet = ether1394_alloc_common_packet(priv->host);
+	if (!packet)
+		return -1;
+
+	if (ptask->tx_type == ETH1394_GASP) {
+		int length = tx_len + (2 * sizeof(quadlet_t));
+
+		ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
+	} else if (ether1394_prep_write_packet(packet, priv->host,
+					       ptask->dest_node,
+					       ptask->addr, ptask->skb->data,
+					       tx_len)) {
+		hpsb_free_packet(packet);
+		return -1;
+	}
+
+	ptask->packet = packet;
+	hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
+				      ptask);
+
+	if (hpsb_send_packet(packet) < 0) {
+		ether1394_free_packet(packet);
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/* Task function to be run when a datagram transmission is completed */
+static inline void ether1394_dg_complete(struct packet_task *ptask, int fail)
+{
+	struct sk_buff *skb = ptask->skb;
+	struct net_device *dev = skb->dev;
+	struct eth1394_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	/* Statistics */
+	spin_lock_irqsave(&priv->lock, flags);
+	if (fail) {
+		priv->stats.tx_dropped++;
+		priv->stats.tx_errors++;
+	} else {
+		priv->stats.tx_bytes += skb->len;
+		priv->stats.tx_packets++;
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	dev_kfree_skb_any(skb);
+	kmem_cache_free(packet_task_cache, ptask);
+}
+
+
+/* Callback for when a packet has been sent and the status of that packet is
+ * known */
+static void ether1394_complete_cb(void *__ptask)
+{
+	struct packet_task *ptask = (struct packet_task *)__ptask;
+	struct hpsb_packet *packet = ptask->packet;
+	int fail = 0;
+
+	if (packet->tcode != TCODE_STREAM_DATA)
+		fail = hpsb_packet_success(packet);
+
+	ether1394_free_packet(packet);
+
+	ptask->outstanding_pkts--;
+	if (ptask->outstanding_pkts > 0 && !fail) {
+		int tx_len;
+
+		/* Add the encapsulation header to the fragment */
+		tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
+					       &ptask->hdr);
+		if (ether1394_send_packet(ptask, tx_len))
+			ether1394_dg_complete(ptask, 1);
+	} else {
+		ether1394_dg_complete(ptask, fail);
+	}
+}
+
+
+
+/* Transmit a packet (called by kernel) */
+static int ether1394_tx (struct sk_buff *skb, struct net_device *dev)
+{
+	int kmflags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
+	struct eth1394hdr *eth;
+	struct eth1394_priv *priv = netdev_priv(dev);
+	int proto;
+	unsigned long flags;
+	nodeid_t dest_node;
+	eth1394_tx_type tx_type;
+	int ret = 0;
+	unsigned int tx_len;
+	unsigned int max_payload;
+	u16 dg_size;
+	u16 dgl;
+	struct packet_task *ptask;
+	struct eth1394_node_ref *node;
+	struct eth1394_node_info *node_info = NULL;
+
+	ptask = kmem_cache_alloc(packet_task_cache, kmflags);
+	if (ptask == NULL) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	/* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
+	 * it does not set our validity bit. We need to compensate for
+	 * that somewhere else, but not in eth1394. */
+#if 0
+	if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000) {
+		ret = -EAGAIN;
+		goto fail;
+	}
+#endif
+
+	if ((skb = skb_share_check (skb, kmflags)) == NULL) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	/* Get rid of the fake eth1394 header, but save a pointer */
+	eth = (struct eth1394hdr*)skb->data;
+	skb_pull(skb, ETH1394_HLEN);
+
+	proto = eth->h_proto;
+	dg_size = skb->len;
+
+	/* Set the transmission type for the packet.  ARP packets and IP
+	 * broadcast packets are sent via GASP. */
+	if (memcmp(eth->h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
+	    proto == __constant_htons(ETH_P_ARP) ||
+	    (proto == __constant_htons(ETH_P_IP) &&
+	     IN_MULTICAST(__constant_ntohl(skb->nh.iph->daddr)))) {
+		tx_type = ETH1394_GASP;
+		dest_node = LOCAL_BUS | ALL_NODES;
+		max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
+		BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
+		dgl = priv->bc_dgl;
+		if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
+			priv->bc_dgl++;
+	} else {
+		node = eth1394_find_node_guid(&priv->ip_node_list,
+					      be64_to_cpu(*(u64*)eth->h_dest));
+		if (!node) {
+			ret = -EAGAIN;
+			goto fail;
+		}
+		node_info = (struct eth1394_node_info*)node->ud->device.driver_data;
+		if (node_info->fifo == ETHER1394_INVALID_ADDR) {
+			ret = -EAGAIN;
+			goto fail;
+		}
+
+		dest_node = node->ud->ne->nodeid;
+		max_payload = node_info->maxpayload;
+		BUG_ON(max_payload < (512 - ETHER1394_GASP_OVERHEAD));
+
+		dgl = node_info->dgl;
+		if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
+			node_info->dgl++;
+		tx_type = ETH1394_WRREQ;
+	}
+
+	/* If this is an ARP packet, convert it */
+	if (proto == __constant_htons (ETH_P_ARP))
+		ether1394_arp_to_1394arp (skb, dev);
+
+	ptask->hdr.words.word1 = 0;
+	ptask->hdr.words.word2 = 0;
+	ptask->hdr.words.word3 = 0;
+	ptask->hdr.words.word4 = 0;
+	ptask->skb = skb;
+	ptask->priv = priv;
+	ptask->tx_type = tx_type;
+
+	if (tx_type != ETH1394_GASP) {
+		u64 addr;
+
+		spin_lock_irqsave(&priv->lock, flags);
+		addr = node_info->fifo;
+		spin_unlock_irqrestore(&priv->lock, flags);
+
+		ptask->addr = addr;
+		ptask->dest_node = dest_node;
+	}
+
+	ptask->tx_type = tx_type;
+	ptask->max_payload = max_payload;
+        ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload, proto,
+							     &ptask->hdr, dg_size,
+							     dgl);
+
+	/* Add the encapsulation header to the fragment */
+	tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
+	dev->trans_start = jiffies;
+	if (ether1394_send_packet(ptask, tx_len))
+		goto fail;
+
+	netif_wake_queue(dev);
+	return 0;
+fail:
+	if (ptask)
+		kmem_cache_free(packet_task_cache, ptask);
+
+	if (skb != NULL)
+		dev_kfree_skb(skb);
+
+	spin_lock_irqsave (&priv->lock, flags);
+	priv->stats.tx_dropped++;
+	priv->stats.tx_errors++;
+	spin_unlock_irqrestore (&priv->lock, flags);
+
+	if (netif_queue_stopped(dev))
+		netif_wake_queue(dev);
+
+	return 0;  /* returning non-zero causes serious problems */
+}
+
+static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	strcpy (info->driver, driver_name);
+	strcpy (info->version, "$Rev: 1247 $");
+	/* FIXME XXX provide sane businfo */
+	strcpy (info->bus_info, "ieee1394");
+}
+
+static struct ethtool_ops ethtool_ops = {
+	.get_drvinfo = ether1394_get_drvinfo
+};
+
+static int __init ether1394_init_module (void)
+{
+	packet_task_cache = kmem_cache_create("packet_task", sizeof(struct packet_task),
+					      0, 0, NULL, NULL);
+
+	/* Register ourselves as a highlevel driver */
+	hpsb_register_highlevel(&eth1394_highlevel);
+
+	return hpsb_register_protocol(&eth1394_proto_driver);
+}
+
+static void __exit ether1394_exit_module (void)
+{
+	hpsb_unregister_protocol(&eth1394_proto_driver);
+	hpsb_unregister_highlevel(&eth1394_highlevel);
+	kmem_cache_destroy(packet_task_cache);
+}
+
+module_init(ether1394_init_module);
+module_exit(ether1394_exit_module);