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eth1394.c
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eth1394.c
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/*
* eth1394.c -- IPv4 driver for Linux IEEE-1394 Subsystem
*
* Copyright (C) 2001-2003 Ben Collins <[email protected]>
* 2000 Bonin Franck <[email protected]>
* 2003 Steve Kinneberg <[email protected]>
*
* 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.
*
* 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/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.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/unaligned.h>
#include <net/arp.h>
#include "config_roms.h"
#include "csr1212.h"
#include "eth1394.h"
#include "highlevel.h"
#include "ieee1394.h"
#include "ieee1394_core.h"
#include "ieee1394_hotplug.h"
#include "ieee1394_transactions.h"
#include "ieee1394_types.h"
#include "iso.h"
#include "nodemgr.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)
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 */
};
static const char driver_name[] = "eth1394";
static struct kmem_cache *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)
};
static const u16 eth1394_speedto_maxpayload[] = {
/* S100, S200, S400, S800, S1600, S3200 */
512, 1024, 2048, 4096, 4096, 4096
};
MODULE_AUTHOR("Ben Collins ([email protected])");
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, const void *daddr,
const void *saddr, unsigned len);
static int ether1394_rebuild_header(struct sk_buff *skb);
static int ether1394_header_parse(const struct sk_buff *skb,
unsigned char *haddr);
static int ether1394_header_cache(const struct neighbour *neigh,
struct hh_cache *hh);
static void ether1394_header_cache_update(struct hh_cache *hh,
const struct net_device *dev,
const unsigned char *haddr);
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,
};
static int ether1394_recv_init(struct eth1394_priv *priv)
{
unsigned int iso_buf_size;
/* FIXME: rawiso limits us to PAGE_SIZE */
iso_buf_size = min((unsigned int)PAGE_SIZE,
2 * (1U << (priv->host->csr.max_rec + 1)));
priv->iso = hpsb_iso_recv_init(priv->host,
ETHER1394_GASP_BUFFERS * iso_buf_size,
ETHER1394_GASP_BUFFERS,
priv->broadcast_channel,
HPSB_ISO_DMA_PACKET_PER_BUFFER,
1, ether1394_iso);
if (priv->iso == NULL) {
ETH1394_PRINT_G(KERN_ERR, "Failed to allocate IR context\n");
priv->bc_state = ETHER1394_BC_ERROR;
return -EAGAIN;
}
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 0;
}
/* This is called after an "ifup" */
static int ether1394_open(struct net_device *dev)
{
struct eth1394_priv *priv = netdev_priv(dev);
int ret;
if (priv->bc_state == ETHER1394_BC_ERROR) {
ret = ether1394_recv_init(priv);
if (ret)
return ret;
}
netif_start_queue(dev);
return 0;
}
/* This is called after an "ifdown" */
static int ether1394_stop(struct net_device *dev)
{
/* flush priv->wake */
flush_scheduled_work();
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);
}
/* FIXME: 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)
{
struct hpsb_host *host =
((struct eth1394_priv *)netdev_priv(dev))->host;
ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
ether1394_host_reset(host);
}
static inline int ether1394_max_mtu(struct hpsb_host* host)
{
return (1 << (host->csr.max_rec + 1))
- sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
}
static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
{
int max_mtu;
if (new_mtu < 68)
return -EINVAL;
max_mtu = ether1394_max_mtu(
((struct eth1394_priv *)netdev_priv(dev))->host);
if (new_mtu > max_mtu) {
ETH1394_PRINT(KERN_INFO, dev->name,
"Local node constrains MTU to %d\n", max_mtu);
return -ERANGE;
}
dev->mtu = new_mtu;
return 0;
}
static void purge_partial_datagram(struct list_head *old)
{
struct partial_datagram *pd;
struct list_head *lh, *n;
struct fragment_info *fi;
pd = list_entry(old, struct partial_datagram, list);
list_for_each_safe(lh, n, &pd->frag_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_new_node(struct eth1394_host_info *hi,
struct unit_directory *ud)
{
struct eth1394_priv *priv;
struct eth1394_node_ref *new_node;
struct eth1394_node_info *node_info;
new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
if (!new_node)
return -ENOMEM;
node_info = kmalloc(sizeof(*node_info), 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 = CSR1212_INVALID_ADDR_SPACE;
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_probe(struct device *dev)
{
struct unit_directory *ud;
struct eth1394_host_info *hi;
ud = container_of(dev, struct unit_directory, device);
hi = hpsb_get_hostinfo(ð1394_highlevel, ud->ne->host);
if (!hi)
return -ENOENT;
return eth1394_new_node(hi, ud);
}
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(ð1394_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)
return 0;
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;
hi = hpsb_get_hostinfo(ð1394_highlevel, ud->ne->host);
if (!hi)
return -ENOENT;
priv = netdev_priv(hi->dev);
node = eth1394_find_node(&priv->ip_node_list, ud);
if (node)
return 0;
return eth1394_new_node(hi, ud);
}
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 = driver_name,
.id_table = eth1394_id_table,
.update = eth1394_update,
.driver = {
.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 = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
int max_speed = IEEE1394_SPEED_MAX;
spin_lock_irqsave(&priv->lock, flags);
memset(priv->ud_list, 0, sizeof(priv->ud_list));
priv->bc_maxpayload = 512;
/* Determine speed limit */
/* FIXME: This is broken for nodes with link speed < PHY speed,
* and it is suboptimal for S200B...S800B hardware.
* The result of nodemgr's speed probe should be used somehow. */
for (i = 0; i < host->node_count; i++) {
/* take care of S100B...S400B PHY ports */
if (host->speed[i] == SELFID_SPEED_UNKNOWN) {
max_speed = IEEE1394_SPEED_100;
break;
}
if (max_speed > host->speed[i])
max_speed = host->speed[i];
}
priv->bc_sspd = max_speed;
if (set_mtu) {
/* Use the RFC 2734 default 1500 octets or the maximum payload
* as initial MTU */
dev->mtu = min(1500, ether1394_max_mtu(host));
/* Set our hardware address while we're at it */
memcpy(dev->dev_addr, &guid, sizeof(u64));
memset(dev->broadcast, 0xff, sizeof(u64));
}
spin_unlock_irqrestore(&priv->lock, flags);
}
static const struct header_ops ether1394_header_ops = {
.create = ether1394_header,
.rebuild = ether1394_rebuild_header,
.cache = ether1394_header_cache,
.cache_update = ether1394_header_cache_update,
.parse = ether1394_header_parse,
};
static void ether1394_init_dev(struct net_device *dev)
{
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->header_ops = ðer1394_header_ops;
SET_ETHTOOL_OPS(dev, ðtool_ops);
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;
/* FIXME: This value was copied from ether_setup(). Is it too much? */
dev->tx_queue_len = 1000;
}
/*
* Wake the queue up after commonly encountered transmit failure conditions are
* hopefully over. Currently only tlabel exhaustion is accounted for.
*/
static void ether1394_wake_queue(struct work_struct *work)
{
struct eth1394_priv *priv;
struct hpsb_packet *packet;
priv = container_of(work, struct eth1394_priv, wake);
packet = hpsb_alloc_packet(0);
/* This is really bad, but unjam the queue anyway. */
if (!packet)
goto out;
packet->host = priv->host;
packet->node_id = priv->wake_node;
/*
* A transaction label is all we really want. If we get one, it almost
* always means we can get a lot more because the ieee1394 core recycled
* a whole batch of tlabels, at last.
*/
if (hpsb_get_tlabel(packet) == 0)
hpsb_free_tlabel(packet);
hpsb_free_packet(packet);
out:
netif_wake_queue(priv->wake_dev);
}
/*
* 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;
u64 fifo_addr;
if (hpsb_config_rom_ip1394_add(host) != 0) {
ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
return;
}
fifo_addr = hpsb_allocate_and_register_addrspace(
ð1394_highlevel, host, &addr_ops,
ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
hpsb_config_rom_ip1394_remove(host);
return;
}
dev = alloc_netdev(sizeof(*priv), "eth%d", ether1394_init_dev);
if (dev == NULL) {
ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
goto out;
}
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;
INIT_WORK(&priv->wake, ether1394_wake_queue);
priv->wake_dev = dev;
hi = hpsb_create_hostinfo(ð1394_highlevel, host, sizeof(*hi));
if (hi == NULL) {
ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
goto out;
}
ether1394_reset_priv(dev, 1);
if (register_netdev(dev)) {
ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
goto out;
}
ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (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;
ether1394_recv_init(priv);
return;
out:
if (dev)
free_netdev(dev);
if (hi)
hpsb_destroy_hostinfo(ð1394_highlevel, host);
hpsb_unregister_addrspace(ð1394_highlevel, host, fifo_addr);
hpsb_config_rom_ip1394_remove(host);
}
/* Remove a card from our list */
static void ether1394_remove_host(struct hpsb_host *host)
{
struct eth1394_host_info *hi;
struct eth1394_priv *priv;
hi = hpsb_get_hostinfo(ð1394_highlevel, host);
if (!hi)
return;
priv = netdev_priv(hi->dev);
hpsb_unregister_addrspace(ð1394_highlevel, host, priv->local_fifo);
hpsb_config_rom_ip1394_remove(host);
if (priv->iso)
hpsb_iso_shutdown(priv->iso);
unregister_netdev(hi->dev);
free_netdev(hi->dev);
}
/* A bus reset happened */
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(ð1394_highlevel, host);
/* This can happen for hosts that we don't use */
if (!hi)
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 = 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, const void *daddr,
const 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;
if (eth->h_proto == htons(ETH_P_IP))
return arp_find((unsigned char *)ð->h_dest, skb);
ETH1394_PRINT(KERN_DEBUG, skb->dev->name,
"unable to resolve type %04x addresses\n",
ntohs(eth->h_proto));
return 0;
}
static int ether1394_header_parse(const struct sk_buff *skb,
unsigned char *haddr)
{
memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
return ETH1394_ALEN;
}
static int ether1394_header_cache(const struct neighbour *neigh,
struct hh_cache *hh)
{
unsigned short type = hh->hh_type;
struct net_device *dev = neigh->dev;
struct eth1394hdr *eth =
(struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
if (type == 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,
const struct net_device *dev,
const unsigned char * haddr)
{
memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
}
/******************************************
* Datagram reception code
******************************************/
/* Copied from net/ethernet/eth.c */
static u16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct eth1394hdr *eth;
unsigned char *rawp;
skb_reset_mac_header(skb);
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 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 == 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;
__be64 guid;
/* 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)));
guid = get_unaligned(&arp1394->s_uniq_id);
node = eth1394_find_node_guid(&priv->ip_node_list,
be64_to_cpu(guid));
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 == htons(ARPOP_REQUEST))
memset(arp_ptr, 0, sizeof(u64));
else
memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
}
/* Now add the ethernet header. */
if (dev_hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
skb->len) >= 0)
ret = ether1394_type_trans(skb, dev);
return ret;
}
static int fragment_overlap(struct list_head *frag_list, int offset, int len)
{
struct fragment_info *fi;
int end = offset + len;
list_for_each_entry(fi, frag_list, list)
if (offset < fi->offset + fi->len && end > fi->offset)
return 1;
return 0;
}
static 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 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(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
new->offset = offset;
new->len = len;
list_add(&new->list, lh);
return 0;
}
static 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(*new), GFP_ATOMIC);
if (!new)
return -ENOMEM;
INIT_LIST_HEAD(&new->frag_info);